A filter device

Abstract

The application relates to a filtering device, which comprises a shell mechanism, filter material and a base. The shell mechanism comprises an inner cylinder and an outer cylinder. The inner cylinder is internally provided with a flow channel extending in a first direction. A first side of the inner cylinder is provided with an input port. The input port is in communication with an input end of the flow channel. The gas to be filtered enters the flow channel from the input port and flows out of the filtering space in a radial direction. The thickness of the filtering space gradually increases along the flow direction of the flow channel. The diameter of the outer cylinder gradually decreases along the flow direction of the flow channel. The circumferential side of the outer cylinder is provided with a first groove, and the circumferential side of the inner cylinder is provided with a second groove. The filter material is filled in the filtering space. The application solves the problem of uneven utilization of the filter material. The first groove provided on the circumferential side of the outer cylinder can relieve the airflow congestion problem caused by the too-close distance between adjacent filter cylinders and reduce the overall system resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filter, in particular to a filter device. BACKGROUND

[0002] The cylindrical filter is a common gas filter for filtering chemical gas in air, which is composed of an inner cylinder shell and an outer cylinder shell nested, and the filter material with adsorption capacity is filled between the two cylinders. The inner cylinder and the outer cylinder both have a plurality of openings, and the pore size is smaller than the particle diameter of the filter material, so that the air can pass through, but the filter material cannot pass through. One end of the filter is an air inlet, and the other end is a closed structure. The air enters from the air inlet, and after being filtered by the filter material, the chemical substances carried by the gas are adsorbed by the filter material. The clean air flows out radially from the outer cylinder to each side. The filter material will lose its filtering effect after adsorbing a certain amount of chemical gas and needs to be replaced.

[0003] In the traditional cylindrical filter, the driving fluid forward motion of the air inlet is dynamic pressure, and the driving fluid outward filtering motion is static pressure. In the initial section of the cylinder, the static pressure and the dynamic pressure each account for a part, but at the end of the blind plate, all the dynamic pressure is converted into static pressure, resulting in a larger static pressure near the end, and thus a larger flow rate to the four corners, leading to faster consumption of the filter material. The filter material near the air inlet is consumed slowly due to low speed, so the filter material at the end far from the air inlet is exhausted, and the filter material at the air inlet is not completely used. At this time, the overall filtering efficiency of the filter is low and needs to be replaced, resulting in uneven use of filter material and serious waste. In addition, due to the uneven flow rate of the filter, when multiple groups of filters are arranged in an array to form a filter device, the air flow discharged between adjacent filters will interfere with each other to form turbulent flow, causing excessive air flow resistance. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the problem of uneven flow rate of the filter in the prior art, when multiple groups of filters are arranged in an array to form a filter device, the air flow discharged between adjacent filters will interfere with each other to form turbulent flow, causing excessive air flow resistance, thereby providing a filter device.

[0005] To solve the above technical problems, the present application provides a filter device, comprising:

[0006] The shell mechanism comprises an inner cylinder and an outer cylinder, the inner cylinder is internally provided with a flow channel extending in a first direction, a first side of the inner cylinder is provided with an input port, the input port is in communication with an input end of the flow channel, the outer cylinder is sleeved on the inner cylinder, a filter space is enclosed between the outer cylinder and the inner cylinder, the gas to be filtered enters the flow channel from the input port and flows out along the radial direction of the filter space, the thickness of the filter space gradually increases along the flow direction of the flow channel, the thickness of the filter space along the circumferential direction is equal, the diameter of the outer cylinder gradually decreases along the flow direction of the flow channel, a first groove is formed on the circumferential side of the outer cylinder along the length direction of the outer cylinder, and a second groove is formed on the circumferential side of the inner cylinder corresponding to the first groove.

[0007] The filter material is filled in the filter space.

[0008] The base is connected to the first ends of the inner cylinder and the outer cylinder.

[0009] In an embodiment of the present application, the outer cylinder comprises a plurality of first support rings arranged at intervals in the first direction and a first support member extending in the first direction and connected to the adjacent first support rings at two ends, and a first sub-flow channel is formed between the adjacent first support members and is in communication with the filter space and the outside.

[0010] In an embodiment of the present application, the inner cylinder comprises a plurality of second support rings arranged at intervals in the first direction and a second support member extending in the first direction and connected to the adjacent second support rings at two ends, and a second sub-flow channel is formed between the adjacent second support members and is in communication with the filter space and the flow channel.

[0011] In an embodiment of the present application, the first support rings and the second support rings are connected by a plurality of first connecting members and a plurality of second connecting members extending in the first direction, respectively, and the first groove and the second groove are located between the adjacent first connecting members and the adjacent second connecting members, respectively.

[0012] In an embodiment of the present application, the outer cylinder and the inner cylinder are coaxially arranged, and the first groove and the second groove are arranged on four sides of the outer cylinder and the inner cylinder in the circumferential direction, respectively.

[0013] In an embodiment of the present application, the diameter of the inner cylinder gradually decreases along the flow direction of the flow channel, and the decreasing rate of the diameter of the inner cylinder along the flow direction of the flow channel is greater than the decreasing rate of the diameter of the outer cylinder along the flow direction of the flow channel.

[0014] In an embodiment of the present application, the outer cylinder comprises a first cylinder body and a second cylinder body in the axial direction, the inner cylinder comprises a third cylinder body and a fourth cylinder body in the axial direction, the diameter of the first cylinder body is constant along the flow direction of the flow channel, the diameter of the second cylinder body gradually decreases along the flow direction of the flow channel, the diameter of the third cylinder body gradually decreases along the flow direction of the flow channel, the diameter of the fourth cylinder body gradually decreases along the flow direction of the flow channel, and the decreasing rate of the diameter of the fourth cylinder body along the flow direction of the flow channel is greater than the decreasing rate of the diameter of the first cylinder body, the second cylinder body and the third cylinder body along the flow direction of the flow channel.

[0015] In an embodiment of the present application, the filter life is positively correlated with the ratio of the filter thickness and the flow rate through the filter, the flow rate through the filter is negatively correlated with the filter thickness, and the second cylinder body, the third cylinder body and the fourth cylinder body are configured to be arc-shaped and narrowed, so that the filter life is equal at different positions in the filter space.

[0016] In an embodiment of the present application, the second ends of the inner cylinder and the outer cylinder are respectively provided with a first end cover and a second end cover, a steady flow space is formed between the first end cover and the second end cover, the steady flow space is communicated with the filter space and filled with filter material.

[0017] In an embodiment of the present application, the first end cover and the second end cover are provided with a third sub-flow channel and a fourth sub-flow channel respectively communicated with the filter space, the flow direction of the third sub-flow channel and the fourth sub-flow channel is parallel to the flow direction of the flow channel, the thickness of the filter space near the steady flow space is a first thickness, the thickness of the filter space between the junction of the first cylinder body and the second cylinder body and the junction of the third cylinder body and the fourth cylinder body is a second thickness, and the second thickness is greater than the first thickness.

[0018] In an embodiment of the present application, the base is provided with a clamping groove matched with the outer cylinder and the inner cylinder, the base is provided with a buckle, and the outer cylinder is provided with a protruding part matched with the buckle.

[0019] The present application also provides a filter device comprising at least two air filters as described above.

[0020] In an embodiment of the present application, the filter device further comprises a frame provided with a plurality of fixing holes, each fixing hole is provided with a plurality of positioning holes on the peripheral side, the base is matched with the fixing hole, the base is provided with a locking member matched with the positioning hole, and each air filter is installed in the fixing hole by cooperation of the locking member and the positioning hole.

[0021] In one embodiment of the present application, the first grooves are respectively formed on opposite sides of adjacent air filters, the adjacent air filters have a channel space therebetween, the first grooves form an avoiding space between the adjacent air filters, the avoiding space is communicated with the channel space, and the size of the avoiding space gradually increases along the flow direction of the flow channel.

[0022] The above technical solution of the present application has the following beneficial effects compared with the prior art:

[0023] The filter device of the present application gradually thickens the thickness of the filter space along the flow direction of the flow channel, which adapts to the high flow and high flow rate characteristics of the rear end of the flow channel due to high static pressure. The thickened rear end filter material can balance the load of the front and rear end filter materials by increasing the adsorption capacity and balancing the through flow, so that each section of filter material reaches the adsorption saturation state synchronously, avoiding the problem of premature failure of the rear end filter material while the front end filter material is idle, greatly improving the overall utilization rate of the filter material and prolonging the replacement cycle. The first grooves formed on the outer cylinder circumferential side can form a widened airflow channel when the filter cartridges are arranged in an array, which can alleviate the airflow congestion problem caused by the close distance between adjacent filter cartridges, reduce the overall system resistance, and meet the demand of high processing capacity scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the content of the present application easier to be clearly understood, the present application will be further described in detail below according to specific embodiments of the present application and in conjunction with the drawings.

[0025] Figure 1 is a structural schematic diagram of the filter of the present application;

[0026] Figure 2 is an enlarged view of A in the present application Figure 1 ;

[0027] Figure 3 is an exploded schematic diagram of the filter of the present application;

[0028] Figure 4 is an assembly schematic diagram of the filter and the base;

[0029] Figure 5 is a sectional view of the filter of the present application;

[0030] Figure 6 is an enlarged view of B in the present application Figure 5 ;

[0031] Figure 7 is a structural schematic diagram of the inner cylinder of the present application;

[0032] Figure 8 is a perspective view of the filter device of the present application;

[0033] Figure 9is a front view of the filtering device of the present application;

[0034] Figure 10 is a schematic view of the avoiding space of the present application;

[0035] Figure 11 is a perspective view of the frame of the present application.

[0036] Explanation of the drawing marks: 1, outer cylinder; 11, first support ring; 12, first support; 13, first connecting piece; 14, first cylinder body; 15, second cylinder body; 16, first end cover; 17, protruding part; 18, first groove; 19, first sub-flow channel; 2, inner cylinder; 21, second end cover; 22, second groove; 23, third cylinder body; 24, fourth cylinder body; 25, fifth cylinder body; 3, base; 31, locking piece; 311, nail body; 312, nail cap; 32, clamping groove; 33, buckle; 4, frame; 41, fixing hole; 42, positioning hole; 43, avoiding space; 44, channel space; 5, flow channel; 6, filtering space. DETAILED DESCRIPTION

[0037] The present application will be further described below in conjunction with the drawings and specific examples, so that those skilled in the art can better understand the present application and implement it, but the examples are not as a limitation of the present application.

[0038] Examples

[0039] Reference Figures 1-8 As shown in the drawings, a filtering device of the present application comprises:

[0040] A housing mechanism comprising an inner cylinder 2 and an outer cylinder 1, the inner cylinder 2 is provided with a flow channel 5 extending in a first direction, a first side of the inner cylinder 2 is provided with an input port, the input port and an input end of the flow channel 5 are in communication, the outer cylinder 1 is sleeved on the inner cylinder 2, a filtering space 6 is formed between the outer cylinder 1 and the inner cylinder 2, the gas to be filtered enters the flow channel 5 from the input port and flows out along the radial direction of the filtering space 6, the thickness of the filtering space 6 gradually increases along the flow direction of the flow channel 5, the circumferential thickness of the filtering space 6 is equal, the diameter of the outer cylinder 1 gradually decreases along the flow direction of the flow channel 5, the first groove 18 is provided on the circumference of the outer cylinder 1 along the length direction thereof, the second groove 22 corresponding to the first groove 18 is provided on the circumference of the inner cylinder 2;

[0041] Filtering material filled in the filtering space 6;

[0042] A base 3 connected to the first end of the inner cylinder 2 and the outer cylinder 1.

[0043] The present invention discloses a filtration device, wherein the housing structure serves as the main support and airflow guiding structure for an air filter, comprising an inner cylinder 2 and an outer cylinder 1. The inner cylinder 2 contains a flow channel 5 extending along a first direction, which is the axial and longitudinal direction of the housing structure. The flow channel 5 provides a flow path for the gas to be filtered. An inlet is provided on the first side of the inner cylinder 2, directly connected to the inlet end of the flow channel 5, allowing the gas to be filtered to enter the flow channel 5 from the inlet. The outer cylinder 1 is fitted over the inner cylinder 2, and the gap between them forms a filtration space 6. The two cylinders are nested to form the filtration space 6, which is filled with filter media for filtering and purifying the passing gas. The flow path of the gas to be filtered is as follows: after entering the flow channel 5 from the inlet, it moves along the flow direction of the flow channel 5, then passes through the circumferential structure of the inner cylinder 2 and the outer cylinder 1, and flows out radially along the filtration space 6. During this process, the gas passes through the filter media to complete the filtration.

[0044] Because the static pressure is higher at the rear end of the flow channel 5, far from the inlet, due to gas flow accumulation, the flow rate and velocity of gas passing through the filter media in this area are significantly higher than at the front end, causing rapid saturation of the rear filter media and low utilization of the front filter media. By gradually increasing the thickness of the filtration space 6 along the flow direction of the flow channel 5, and utilizing the positive correlation between filter media lifespan and thickness, more filter media is provided for the high-flow area at the rear end. By setting the diameter of the outer cylinder 1 to gradually decrease along the flow direction of the flow channel 5, a bullet-shaped narrowing structure is formed, guiding the orderly flow of gas, reducing turbulence caused by uneven static pressure, and increasing the flow space for the filtered gas at the rear end. In addition, corresponding first grooves 18 and second grooves 22 are formed on the periphery of the outer cylinder 1 and the inner cylinder 2 along the length direction. The first grooves 18 and second grooves 22 not only enhance the structural strength of the cylinder wall, but also reserve airflow channels for the assembly of adjacent filters, avoiding airflow congestion when densely arranged. The base 3 is connected to the first end of the inner cylinder 2 and the outer cylinder 1, providing stable support for the overall structure, ensuring that the relative positions of the inner cylinder 2 and the outer cylinder 1 are fixed, and maintaining the preset shape of the filtration space 6. With the above settings, the front and rear sections of the filter can reach the end of their lifespan almost simultaneously, increasing the overall lifespan by 20%.

[0045] After the gas to be filtered enters the flow channel 5 of the inner cylinder 2 through the inlet, it flows in the first direction. At the front end of the flow channel 5, near the inlet, the static pressure is low, and the flow rate and velocity of the gas diffusing into the filtration space 6 through the openings in the inner cylinder 2 wall are low. Therefore, the thickness of the filtration space 6 is set to be relatively thin. The thin filter media can quickly guide the gas through, and the ratio of filter media thickness to flow rate is at a baseline level, resulting in a stable filter media consumption rate. As the gas flows towards the rear end of the flow channel 5, the static pressure gradually increases, and the flow rate and velocity of the gas diffusing into the filtration space 6 significantly increase.

[0046] Since the thickness of the filter space 6 gradually increases along the flow direction of the flow channel 5, the filter material at the rear end is thicker, which directly prolongs the service life by increasing the thickness, and indirectly reduces the flow through this area by increasing the resistance, so that the ratio of filter material thickness to flow rate remains at a baseline level, ensuring that the consumption rate of filter material at the rear end is consistent with that at the front end, and eliminating the influence of the barrel effect on the uneven service life of filter material at different positions. The filtered gas is guided along the outer cylinder 1 in a gradually decreasing diameter, and is filtered out in an orderly manner along the radial direction based on the initial speed in an inclined manner and is discharged axially backward. Since the rear end of the outer shell is narrowed, a clean gas flow passage is provided to avoid the impact of the turbulent flow tail on the outer wall of the outer cylinder 1 downstream, thereby avoiding the formation of external positive pressure on the downstream filtered gas by the turbulent flow, which causes difficulty in discharging the gas.

[0047] Referring to Figure 5 As shown, the outer cylinder 1 comprises a plurality of first support rings 11 arranged at intervals along a first direction, and a first support member 12 extending along the first direction and connected to adjacent first support rings 11 at both ends, and a first sub-flow channel 19 is formed between adjacent first support members 12 and is connected to the filter space 6 and the outside.

[0048] The outer cylinder 1, as the outer boundary of the filter space 6, needs to meet the requirements of structural stability and gas flow guidance. If the outer cylinder 1 lacks support, it is easy to deform due to filter material filling pressure or gas flow impact, resulting in uneven thickness of the filter space 6 and exacerbating the difference in filter material consumption. The outer cylinder 1 of the present embodiment is composed of a plurality of first support rings 11 arranged at intervals along a first direction and a first support member 12 extending along the first direction and connected to adjacent first support rings 11 at both ends. The first support rings 11 are annular structures extending in the circumferential direction of the outer cylinder 1, and their diameters gradually decrease along the flow direction of the flow channel 5, which is consistent with the shape of the bullet-shaped and first groove 18 of the outer cylinder 1, and can effectively maintain the radial shape of the outer cylinder 1 and prevent radial deformation. The first support member 12 extends along the first direction and is connected to adjacent first support rings 11 at both ends, which connects the dispersed support rings in series to form a whole, enhances the axial structural strength of the outer cylinder 1, and maintains the preset shrinkage gradient of the outer cylinder 1 in the length direction, avoiding axial bending or misalignment.

[0049] The first sub-flow channel 19 is formed between adjacent first support members 12. The first sub-flow channel 19 is connected to the filter space 6 and the flow channel 5. The filtered gas flows out through the first sub-flow channel 19. The distribution density of the first support members 12 gradually adjusts along the flow direction of the flow channel 5. The layout of the first support members 12 is adapted to the first grooves 18 of the outer cylinder 1. The spacing between the support members in the groove area can be further expanded to strengthen the airflow channel effect of the inner recess and improve the airflow flow efficiency when multiple filters are densely arranged. After the filtered gas enters the inside of the outer cylinder 1, it is constrained by the shape of the first support ring 11 and diffuses outward along the contraction direction of the outer cylinder 1. The airflow is orderly guided to the first sub-flow channel 19 between adjacent support members, avoiding the formation of stagnation between the cylinder wall and the filter material. At the front end of the flow channel 5, the dense first sub-flow channel 19 quickly discharges a large amount of gas, and in cooperation with the thin filter material, the gas flow resistance is low; at the rear end of the flow channel 5, the spacing between the support members is expanded, the first sub-flow channel 19 is adapted to the reduced gas flow, and at the same time, the thick filter material slowly discharges the gas through the first sub-flow channel 19, maintaining the thickness / flow ratio stable.

[0050] The inner cylinder 2 comprises a plurality of second support rings arranged at intervals along the first direction, and second support members extending along the first direction and connected to adjacent second support rings at both ends. A second sub-flow channel is formed between adjacent second support members and is connected to the filter space 6 and the flow channel 5. The inner cylinder 2 and the outer cylinder 1 have similar structures. The second support ring is a plurality of rings arranged at intervals along the first direction and extending along the circumference of the inner cylinder 2 in a ring structure. The diameter gradually decreases along the flow direction of the flow channel 5, which is consistent with the contraction trend of the inner cylinder 2, can maintain the radial shape of the inner cylinder 2, and prevent the cross section of the flow channel 5 from suddenly changing due to high static pressure at the rear end. The second support member extends along the first direction or at a certain angle with the first direction, and is connected to adjacent second support rings at both ends. The plurality of support rings are connected in series to enhance the axial structural strength of the inner cylinder 2 and ensure that the inner cylinder 2 maintains the preset contraction gradient in the length direction, avoiding axial bending caused by high flow velocity of the gas flow at the rear end. After the filtered gas enters the flow channel 5 of the inner cylinder 2 from the input port, it flows along the first direction and is constrained by the second support ring. The cross section of the flow channel 5 maintains a gradient contraction, maintaining a stable airflow velocity and avoiding flow velocity fluctuations caused by the expansion of the existing inner cylinder 2. When the gas flows to the area of the second support member, it flows to the filter space 6 along the second sub-flow channel between adjacent support members.

[0051] Referring to Figures 3-4 The first support ring 11 and the second support ring are connected by a plurality of first connecting members 13 and second connecting members 14 extending along the first direction, respectively. The first grooves 18 and the second grooves 22 are located between adjacent first connecting members 13 and second connecting members 14, respectively.

[0052] To ensure the relative position of the inner cylinder 2 and the outer cylinder 1 is stable, and avoid the thickness of the filter space 6 changing due to structural displacement, the first support ring 11 and the second support ring are connected by the first connecting piece 13 and the second connecting piece respectively. The first connecting piece 13 extends along the first direction, connects adjacent first support rings 11, and connects the support rings of the outer cylinder 1 in series to form a continuous framework, further enhancing the axial integrity of the outer cylinder 1 and ensuring the consistency of the outer cylinder 1 in the contracted form.

[0053] The first groove 18 and the second groove 22 are respectively located between adjacent first connecting pieces 13 and second connecting pieces: the first groove 18 is opened on the side of the outer cylinder 1, avoiding the rigid structure of the first connecting piece 13, forming a concave area; the second groove 22 is opened on the side of the inner cylinder 2, located between adjacent second connecting pieces, corresponding to the first groove 18. The groove area is not blocked by the connecting piece, on the one hand, forming a concave airflow channel, widening the additional avoiding space 43 of the gas, especially when multiple filters are densely arranged, the grooves of adjacent filter cartridges correspond to each other, reducing airflow congestion; on the other hand, the grooves are evenly distributed along the circumference, which can be used as installation alignment marks and adapt to ergonomic gripping, facilitating tool-free disassembly, and the operator can quickly position the inner and outer cylinders 1 by aligning the grooves.

[0054] Referring to Figure 2 As shown in the drawings, the outer cylinder 1 and the inner cylinder 2 are coaxially arranged, and the first groove 18 and the second groove 22 are arranged on the four sides of the outer cylinder 1 and the inner cylinder 2 in the circumferential direction. The diffusion resistance of the gas in each direction along the circumference of the inner cylinder 2 is consistent, the first groove 18 and the second groove 22 are arranged on the four sides of the outer cylinder 1 and the inner cylinder 2 in the circumferential direction, and are evenly spaced in the circumferential direction to form a symmetrical structure. The circumferential uniformity of the airflow is strengthened, the four-side grooves make the inner cylinder 2 and the outer cylinder 1 have concave channels in each direction along the circumference, and the gas can diffuse and flow out uniformly along the four sides in the circumferential direction, and at the same time, the four-side channels further widen the common airflow space when multiple filters are arranged, reducing the resistance.

[0055] The diameter of the inner cylinder 2 gradually decreases along the flow direction of the flow channel 5, and the decreasing rate of the diameter of the inner cylinder 2 along the flow direction of the flow channel 5 is greater than the decreasing rate of the diameter of the outer cylinder 1 along the flow direction of the flow channel 5. The diameter of the inner cylinder 2 gradually decreases along the flow direction of the flow channel 5, and the decreasing rate is greater than that of the outer cylinder 1: the diameters of the inner cylinder 2 and the outer cylinder 1 at the front end of the flow channel 5 are both large, and the thickness of the filter space 6 is thin, which is suitable for the low flow and low speed at the front end due to the small static pressure; at the rear end of the flow channel 5, the diameter of the inner cylinder 2 decreases rapidly due to the faster contraction rate, and the outer cylinder 1 contracts slowly, and the difference between the radii of the two is significantly increased, so that the thickness of the filter space 6 is increased.

[0056] The difference in shrinkage rate needs to be determined based on the static pressure distribution of the flow channel 5: obtain the static pressure value at each location through fluid simulation, derive the corresponding flow rate and velocity, and then calculate the required thickness of the filter space 6 in reverse according to the principle that thickness / flow rate = constant. Finally, it is converted into the shrinkage rate of the inner cylinder 2 and the outer cylinder 1. That is, the higher the static pressure at the rear end, the greater the shrinkage rate of the inner cylinder 2 relative to the outer cylinder 1 needs to be to ensure that the increase in thickness is sufficient to balance the increase in flow rate.

[0057] Reference Figure 2 As shown, the outer cylinder 1 includes a first cylinder 14 and a second cylinder 15 along the axial direction, and the inner cylinder 2 includes a third cylinder 23 and a fourth cylinder 24 along the axial direction. The diameter of the first cylinder 14 remains constant along the flow channel 5, the diameter of the second cylinder 15 gradually decreases along the flow channel 5, the diameter of the third cylinder 23 gradually decreases along the flow channel 5, and the diameter of the fourth cylinder 24 gradually decreases along the flow channel 5. Moreover, the rate of decrease of the diameter of the fourth cylinder 24 along the flow channel 5 is greater than the rate of decrease of the diameters of the first cylinder 14, the second cylinder 15, and the third cylinder 23 along the flow channel 5.

[0058] The diameter of the first cylinder 14 remains constant along the flow direction of the flow channel 5, providing a stable outer boundary of the filtration space 6 at the front end of the flow channel 5, which is suitable for the filtration requirements of the smaller flow rate of gas at the front end; the diameter of the second cylinder 15 gradually decreases along the flow direction of the flow channel 5, forming a streamlined constriction section, which guides the airflow to diffuse orderly towards the rear end, further avoiding turbulence caused by the airflow hitting the rear end structure. The inner cylinder 2 is divided into a third cylinder 23 and a fourth cylinder 24 along the axial direction. The diameter of both gradually decreases along the flow direction of the flow channel 5, but the rate of decrease of the fourth cylinder 24 is greater than that of the first cylinder 14, the second cylinder 15, and the third cylinder 23. The third cylinder 23 contracts slowly and cooperates with the first cylinder 14 of the outer cylinder 1 to slowly increase the thickness of the filtration space 6 at the front end of the flow channel 5, which is suitable for the initial diffusion of the gas flow at the front end. The fourth cylinder 24 contracts rapidly and cooperates with the second cylinder 15 of the outer cylinder 1 to rapidly increase the thickness of the filtration space 6 at the rear end of the flow channel 5, and causes the rear end of the filter to shrink as a whole to form a bullet-shaped structure, which is suitable for the further reduction of the gas flow at the rear end, while strengthening the streamlined structure and reducing airflow resistance.

[0059] Furthermore, a fifth cylinder 25 is also provided on the side of the inner cylinder 2 near the input end. The diameter of the fifth cylinder 25 gradually decreases along the direction of the flow channel 5, and the rate of decrease is greater than that of the fourth cylinder 24, so as to form a larger opening at the input end, increase the gas input capacity, and allow it to be closer to the outer cylinder 1, thereby reducing the radial dimension of the base 3 structure itself and achieving greater space utilization. Moreover, due to the rapid narrowing of the fifth cylinder 25, the airflow can be accelerated, making it easier for the airflow to pass through the filter media. Furthermore, the airflow velocity at the inlet of the fifth cylinder 25 is relatively low, requiring a lower filter media thickness, and the impact of reducing the filter media thickness at this point is also relatively small.

[0060] With the gas flowing backward, into the rear section filter space 6 composed of the second cylinder body 15 of the outer cylinder 1 and the fourth cylinder body 24 of the inner cylinder 2, the second cylinder body 15 is contracted, and the fourth cylinder body 24 is more rapidly contracted, meeting the requirement of the thickness of the filter space 6; at the same time, the streamlined contraction shape formed by the second cylinder body 15 and the fourth cylinder body 24 guides the gas flow to flow outward and to the rear end, avoiding turbulence and reducing resistance.

[0061] The filter material life is positively correlated with the thickness of the filter material and the flow rate through the filter material, and the flow rate through the filter material is negatively correlated with the thickness of the filter material. The second cylinder body 15, the third cylinder body 23, and the fourth cylinder body 24 are all configured to be arc-shaped and narrowed, so that the filter material life at each position in the filter space 6 is equal. The second cylinder body 15, the third cylinder body 23, and the fourth cylinder body 24 all adopt arc-shaped narrowing, and the thickness gradient of the filter space 6 is achieved by continuously adjusting the curvature, ensuring that the thickness / flow rate ratio of each section is constant. The first cylinder body 14 of the outer cylinder 1, i.e., the front section, has a zero curvature, i.e., the diameter in the first direction is constant, and cooperates with the gentle arc-shaped narrowing of the third cylinder body 23 of the inner cylinder 2, so that the thickness of the filter space 6 in the front section of the flow channel 5 is slowly increased, avoiding the situation that the flow rate is too low due to too rapid thickness increase, and the filter material at the front end is idle.

[0062] Continuing to refer to Figure 2 As shown, the second ends of the inner cylinder 2 and the outer cylinder 1 are respectively provided with a first end cover 16 and a second end cover 21, and a steady flow space is formed between the first end cover 16 and the second end cover 21. The steady flow space is communicated with the filter space 6 and filled with filter material.

[0063] The second ends of the inner cylinder 2 and the outer cylinder 1 are respectively provided with the first end cover 16 and the second end cover 21, and the two cooperate to form a closed steady flow space. In the prior art, the rear end is a blind plate without steady flow design. After the gas flow hits the blind plate, a vortex backflow is formed, which has high resistance and is easy to mix unfiltered gas into the clean gas flow.

[0064] The first end cover 16 is connected to the second end of the inner cylinder 2, and the gas in the flow channel 5 is filtered and discharged through the filter material between the first end cover 16 and the second end cover 21. The second end cover 21 is connected to the second end of the outer cylinder 1 and forms an annular steady flow space with the first end cover 16. The space is filled with filter material, and the thickness of the filter material in the steady flow space is adapted to the flow rate of the rear end gas, ensuring the adsorption effect and adsorption life. The steady flow space is communicated with the outside through an opening in the second end cover 21 or the rear end of the outer cylinder 1. The filtered gas is purified again in the steady flow space and flows out from the opening, avoiding the gas flow stagnation of the existing blind plate.

[0065] The steady flow space avoids the gas flow stagnation caused by too large volume. The end cover 16 is integrally formed with the cylinder body or is detachably arranged. When the end cover 16 is detachably arranged, the filter material in the steady flow space can be easily replaced, and a sealing gasket is arranged at the connection part to prevent unfiltered gas from leaking from the gap, ensuring that all gas passes through the filter and is purified.

[0066] Referring to Figure 3 , Figure 4 As shown in the drawings, the base 3 is provided with a clamping groove 32 adapted to the outer cylinder 1 and the inner cylinder 2, respectively, and the base 3 is provided with a buckle 33, and the outer cylinder 1 is provided with a protruding portion 17 adapted to the buckle 33. The base 3 serves as a support and fixing component of the inner and outer cylinders 1, realizes firm connection, convenient assembly and accurate alignment, realizes quick positioning through the clamping groove 32, realizes manual fixing through the buckle 33, and completely optimizes the assembly process without the need of using special tools.

[0067] The clamping groove 32 is divided into a first sub-groove and a second sub-groove. The first sub-groove is adapted to the cross-sectional shape of the first end of the outer cylinder 1 and matches the shape of the outer cylinder 1. The first end of the outer cylinder 1 can be embedded in the first sub-groove. The circumferential constraint of the first sub-groove limits the radial displacement of the outer cylinder 1. At the same time, the depth of the first sub-groove is adapted to the length of the end of the outer cylinder 1, so as to ensure the stability of the axial position of the outer cylinder 1 after embedding. The second sub-groove is adapted to the cross-sectional shape of the first end of the inner cylinder 2 and matches the contraction shape of the inner cylinder 2. The first end of the inner cylinder 2 is embedded in the second sub-groove. In the same way, radial positioning and axial preliminary fixing are realized. The inner wall of the clamping groove 32 can be provided with an anti-skid structure to enhance the friction between the inner and outer cylinders 1 and the base 3, so as to avoid displacement caused by vibration during use.

[0068] The base 3 is provided with an elastic buckle 33 made of corrosion-resistant elastic plastic or metal. The outer cylinder 1 is provided with a protruding portion 17 at the corresponding position. One end of the buckle 33 is fixed to the base 3, and the other end is a free end and is provided with a guide slope and a step surface at the bottom of the step surface for clamping. When the outer cylinder 1 is embedded in the clamping groove 32, the protruding portion 17 extrudes the free end of the buckle 33 along the guide slope, so that the buckle 33 deforms. After the outer cylinder 1 is embedded in the clamping groove 32, the protruding portion 17 passes over the buckle 33, the buckle 33 elastically resets, buckles the protruding portion 17, limits the axial displacement of the outer cylinder 1, and completes the fixing. The whole process does not need tools and can be operated manually. At the same time, the surface of the base 3 is provided with an identification line corresponding to the groove of the inner and outer cylinders 1, which serves as an assembly alignment reference, solves the problem that there is no special identification and accurate alignment is not possible, and the operator can quickly realize coaxial and circumferential positioning of the inner and outer cylinders 1 by aligning the identification line and the groove, and use the identification to assemble the filter into the outer frame 4.

[0069] Referring to Figures 8-11 As shown in the drawings, the present embodiment further provides a filtering device comprising at least two air filters as described above, and the filtering device further comprises:

[0070] A frame 4 is provided with a plurality of fixing holes 41, and the circumferential side of the fixing hole 41 is provided with a plurality of positioning holes 42. The outer cylinder 1 is adapted to the fixing hole 41, and the base 3 is provided with a locking piece 31 adapted to the positioning hole 42. Each air filter is installed in the fixing hole 41 by cooperation of the locking piece 31 and the positioning hole 42.

[0071] The frame 4 is used as a mounting carrier for multiple air filters, and the frame 4 is provided with multiple fixing holes 41, the size and shape of the fixing holes 41 are adapted to the outer cylinder 1 and the base 3 of the air filter, the outer cylinder 1 of each air filter can be embedded in the corresponding fixing hole 41, and the radial positioning of the filter is realized by the circumferential constraint of the fixing hole 41, so that the installation position of the multiple filters on the frame 4 is accurate, and air flow distribution unevenness caused by installation deviation is avoided.

[0072] Referring to Figure 8 As shown in the figure, the circumferential side of the fixing hole 41 is provided with multiple positioning holes 42, and the base 3 of the air filter is provided with a locking piece 31 adapted to the positioning hole 42. When the outer cylinder 1 of the filter is embedded in the fixing hole 41, the locking piece 31 on the base 3 can be inserted into the positioning hole 42, and the axial displacement and circumferential rotation of the filter are limited by the cooperation of the locking piece 31 and the positioning hole 42, so as to ensure that the installation of the filter on the frame 4 is firm and reliable. The cooperation mode of the locking piece 31 and the positioning hole 42 can adopt a plug-in type or a buckle 33 type to achieve the balance of quick assembly and stable fixation. The plug-in type is convenient for accurate positioning, and the buckle 33 type improves the installation efficiency, which can be selected according to actual needs.

[0073] In this embodiment, the locking piece 31 is a mounting nail, which includes a nail body 311 and a nail cap 312, and the diameter of the nail cap 312 is greater than that of the nail body 311. The positioning hole 42 also includes an arc-shaped long hole and a circular short hole connected in communication, the size of the circular short hole is adapted to the nail cap 312, the size of the arc-shaped long hole is adapted to the nail body 311 and is smaller than that of the nail cap 312, and the length of the nail body 311 is adapted to the thickness of the frame 4. During assembly, the nail cap 312 is first inserted through the circular short hole, and then the base 3 is rotated so that the nail cap 312 and the base 3 body are respectively clamped on both sides of the frame 4, thereby realizing fixed installation. Since the filter will not be subjected to a rotating force in the frame 4, it is not necessary to further lock to realize fixation. In addition, a corresponding mark is provided on the base 3, which corresponds to the axis of the mounting nail, so that the operator can use the mark to align the positioning hole 42 and then rotate. A first groove 18 is provided on the outer cylinder 1, and the second end of the outer cylinder 1 is narrowed to reduce the size, so that the operator can conveniently hold or grip the outer cylinder 1 for rotating installation.

[0074] The layout of the fixing holes 41 of the frame 4 can be designed in an array type, such as multiple rows and multiple columns, and in this embodiment, the number of filters is 16, which are arranged in a 4X4 manner. The distance between adjacent filter cartridges is close, which improves the compactness, and the spacing between adjacent fixing holes 41 is adapted to the design of the first groove 18 of the filter outer cylinder 1, so as to ensure that the first grooves 18 of adjacent filters form a through air flow channel, avoid air flow congestion when densely arranged, and reduce the overall system resistance.

[0075] The first grooves 18 are respectively arranged on opposite sides of adjacent air filters, and the adjacent air filters have a channel space 44 therebetween. The first grooves 18 form an avoiding space 43 between the adjacent air filters, the avoiding space 43 is communicated with the channel space 44, and the size of the avoiding space 43 gradually increases along the flow direction of the flow channel. The first grooves 18 are arranged on the circumferential side of the outer cylinder 1, and the first grooves 18 are respectively arranged on opposite sides of adjacent air filters in the filtering device. When a plurality of filters are installed side by side on the frame 4, the first grooves 18 are arranged on the side of the inner cylinder 2 opposite to each other, and a certain gap or space is formed between the first grooves 18.

[0076] When a plurality of filters are densely arranged, the outer walls of adjacent filters are directly close to each other, and the airflow needs to flow around the surface of the filter cylinder, resulting in narrow airflow channel and high resistance. In the design, the first grooves 18 are arranged on opposite sides of adjacent filters, the size of the inner cylinder 2 in this direction is appropriately reduced, the gap between the two filters is reduced, the arrangement of the plurality of filters on the frame 4 is more compact, and the space utilization is improved. At the same time, the space formed between the grooves directly widens the airflow channel, forms the avoiding space 43 to allow more gas to flow between the adjacent filters, and reduces the resistance loss caused by the airflow around the flow. The air flow through the outer cylinder 1 is continuously collected along the flow direction of the flow channel, and the air flow gradually increases along the flow direction of the flow channel. The avoiding space 43 itself has a size that increases along the flow direction of the flow channel, and can accommodate more air flow to further reduce the airflow resistance. When a plurality of air filters are installed side by side on the frame 4, the second grooves 22 on the opposite sides make the profile of the inner cylinder 2 in this direction more fit, reduce the invalid space between the filters, and the frame 4 can accommodate more filters in the same area, thereby improving the overall processing capacity. After the gas enters the flow channel 5 of each filter, part of the gas enters the filtering space 6 through the second sub-flow channel of the inner cylinder 2, and the other part of the gas flows out of the outer cylinder 1 after being filtered, and enters the space between the adjacent filters. Since the first grooves 18 are arranged on the opposite sides of the adjacent filters, the space forms a widened airflow channel, and the gas can smoothly flow through the channel to the outlet of the device, avoiding airflow congestion caused by too close distance between the filters. During the airflow convergence process, the rounded transition of the grooves makes the airflow smoothly flow along the groove wall, reduces the generation of turbulence, and reduces the local resistance. After the uniformity of the rear airflow is improved by the arc structure design, the resistance is reduced by 40% compared with the conventional structure, and the distance for the airflow to reach stability can be greatly shortened. The overall length of the equipment can be shortened, the material can be saved, and the manufacturing cost can be reduced.

[0077] Obviously, the above embodiments are merely example for clearly illustrating, and are not limitation to the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and can not be exhausted. The obvious changes or variations derived therefrom are still within the scope of the present invention.

Claims

1. A filtration device, characterized in that, Includes at least two air filters, said air filters comprising: A shell structure includes an inner cylinder and an outer cylinder. The inner cylinder has a flow channel extending in a first direction. An inlet is opened on a first side of the inner cylinder, and the inlet is connected to the inlet end of the flow channel. The outer cylinder is fitted onto the inner cylinder, and a filtration space is formed between the outer cylinder and the inner cylinder. The gas to be filtered enters the flow channel from the inlet and flows out radially along the filtration space. The thickness of the filtration space gradually increases along the flow direction of the flow channel and is equal in thickness along the circumferential direction. The diameter of the outer cylinder gradually decreases along the flow direction of the flow channel. A first groove is opened on the circumference of the outer cylinder along its length direction, and a second groove corresponding to the first groove is opened on the circumference of the inner cylinder. Filter media, which fills the filtration space; The base connects the inner cylinder and the first end of the outer cylinder; The first groove is respectively opened on the opposite side of the adjacent air filter, there is a channel space between the adjacent air filters, and the first groove forms a clearance space between the adjacent air filters. The clearance space is connected to the channel space, and the size of the clearance space gradually increases along the flow direction of the channel.

2. The filtration device according to claim 1, characterized in that: The outer cylinder includes: a first support ring and a first support member. The number of first support rings is multiple and they are spaced apart along a first direction. The first support member extends along the first direction and its two ends are respectively connected to adjacent first support rings. A first sub-channel communicating with the filtration space and the outside is formed between adjacent first support members.

3. A filtration device according to claim 2, characterized in that: The inner cylinder includes: a second support ring and a second support member. The number of second support rings is multiple and they are spaced apart along a first direction. The second support member extends along the first direction and its two ends are respectively connected to adjacent second support rings. A second sub-channel is formed between adjacent second support members, which communicates with the filter space and the flow channel.

4. A filtration device according to claim 3, characterized in that: The first support ring and the second support ring are connected by a plurality of first connectors and second connectors extending along a first direction, and the first groove and the second groove are located between adjacent first connectors and second connectors, respectively.

5. A filtration device according to claim 1, characterized in that: The outer cylinder and the inner cylinder are coaxially arranged. The first groove and the second groove are respectively arranged on the four sides of the outer cylinder and the inner cylinder in the circumferential direction. The diameter of the inner cylinder gradually decreases along the flow direction of the flow channel, and the rate of decrease of the inner cylinder diameter along the flow direction of the flow channel is greater than the rate of decrease of the outer cylinder diameter along the flow direction of the flow channel.

6. A filtration device according to claim 1, characterized in that: The outer cylinder includes a first cylinder and a second cylinder along the axial direction, and the inner cylinder includes a third cylinder and a fourth cylinder along the axial direction. The diameter of the first cylinder remains constant along the flow direction, the diameter of the second cylinder gradually decreases along the flow direction, the diameter of the third cylinder gradually decreases along the flow direction, and the diameter of the fourth cylinder gradually decreases along the flow direction. Moreover, the rate of decrease of the diameter of the fourth cylinder along the flow direction is greater than the rate of decrease of the diameters of the first, second, and third cylinders along the flow direction.

7. A filtration device according to claim 6, characterized in that: The lifespan of the filter media is positively correlated with the ratio of the filter media thickness to the flow rate through the filter media, while the flow rate through the filter media is negatively correlated with the filter media thickness. The second, third, and fourth cylinders are all configured to be arc-shaped and narrow, so that the lifespan of the filter media is equal at all points within the filtration space.

8. A filtration device according to claim 7, characterized in that: The inner cylinder and the outer cylinder are respectively provided with a first end cap and a second end cap at their second ends. A flow stabilizing space is formed between the first end cap and the second end cap. The flow stabilizing space is connected to the filtration space and is filled with filter material.

9. A filtration device according to claim 8, characterized in that: The first end cap and the second end cap are respectively provided with a third sub-channel and a fourth sub-channel communicating with the filtration space. The flow direction of the third sub-channel and the fourth sub-channel is parallel to the flow direction of the channel. The thickness of the filtration space near the flow stabilization space is the first thickness. The thickness of the filtration space between the junction of the first cylinder and the second cylinder and the junction of the third cylinder and the fourth cylinder is the second thickness. The second thickness is greater than the first thickness.

10. A filtration device according to claim 1, characterized in that: The base is provided with slots that fit the outer cylinder and the inner cylinder respectively, the base is provided with buckles, and the outer cylinder is provided with protrusions that fit the buckles.

11. A filtration device according to claim 1, characterized in that: The filtering device further includes: a frame, the frame having multiple fixing holes, each fixing hole having multiple positioning holes around its periphery, a base adapted to the fixing holes, the base having a locking element adapted to the positioning holes, and each air filter being installed in the fixing holes by the locking element and the positioning holes cooperating.

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