Smooth deep-layer filtering unit and smooth deep-layer filtering assembly

Abstract

The utility model discloses a smooth deep layer filtration unit and smooth deep layer filtration subassembly, including deep layer filtration medium and frame, said frame and deep layer filtration medium periphery seal connection, the frame is provided with frame liquid inlet and frame exhaust port that are communicated with deep layer filtration medium liquid inlet side, and the frame liquid inlet and the frame exhaust port are communicated with deep layer filtration medium liquid inlet side. A frame liquid outlet communicated with the liquid outlet side of the deep filtering medium is formed in the frame, and a frame containing groove is formed in the outer edge of at least one side face, parallel to or approximately parallel to the deep filtering medium, of the frame. The utility model aims at effectively limiting the overflowing material from flowing to the outer edge of the frame during welding forming, and ensuring the smoothness of the outer edge of the deep filter assembly.

Description

Technical Field

[0001] The utility model belongs to the technical field of deep filtration, and in particular relates to a flat deep filtration unit and a flat deep filtration component. Background Art

[0002] The food industry, chemical industry, pharmaceutical industry, electronic industry, etc. have high purity requirements and hygiene standards for materials and product liquids. As a common filtration component that filters materials and product liquids through internal deep filtration media, deep filter components are widely used in various stages of the process because of their adaptability to a variety of working environments, high filtration efficiency, and simple operation. Common deep filter media are mainly cellulose fibers. Through additives such as diatomaceous earth, adhesives, and filter enhancers, the special internal structure of the deep filter media is realized, thereby achieving the filtration requirements of the deep filter media for different materials.

[0003] The operating environment of the deep filter assembly is usually a high-pressure, high-flow rate working condition. The frames of the deep filter assembly are directly welded to each other and to the outer shell. During the welding process, the frames melt to form overflow, which flows to the outer edge of the frame, causing serious overflow on the outside of the frame, making the outer surface of the deep filter assembly not smooth, which will be affected during use and transportation. Utility Model Content

[0004] The utility model provides a flat deep filter unit and a flat deep filter assembly, which effectively restrict overflow from flowing to the outer edge of the frame during welding and ensure that the outer edge of the deep filter assembly is flat.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A flat deep filter unit comprises a deep filter medium and a frame, wherein the frame is sealed to the periphery of the deep filter medium, the frame is provided with a frame liquid inlet and a frame exhaust port connected to the liquid inlet side of the deep filter medium, the frame is provided with a frame liquid outlet connected to the liquid outlet side of the deep filter medium, and the frame is provided with a frame receiving groove parallel to or approximately parallel to the outer edge of at least one side of the deep filter medium. When the deep filter units are welded and fixedly connected to each other, the overflow is stored in the frame receiving groove, and the overflow is restricted from flowing to the outside of the outer edge of the frame, so as to ensure that the outer edge of the deep filter assembly after welding is flat, so that it can be used stably without the need for additional clamping devices to fix it during transportation and stacking.

[0007] Preferably, the width of the frame receiving groove is 0.5-5mm, the thickness of the outer side wall of the frame receiving groove is 0.1-1.5mm; and / or, the depth of the frame receiving groove is 0.4-4mm. The appropriate width and height of the frame receiving groove can ensure that the volume of the frame receiving groove for storing the overflow material is ensured without affecting the strength of the frame; the frame receiving groove has an outer side wall of appropriate thickness to ensure the strength of the outer side wall and avoid overflow of the outer side wall due to the welding process.

[0008] Preferably, the height of the outer side wall of the frame receiving groove is lower than the height of the inner side wall. During the welding process of the deep filter unit, there is a gap between the outer side walls of the frame receiving groove of adjacent deep filter units, and melting will not occur during the welding process, which can effectively reduce the generation of overflow.

[0009] Preferably, the ratio of the height of the outer side wall of the frame receiving groove to the height of the inner side wall is 0.3-0.9. In this way, when adjacent deep filter units are welded, the gap between the outer side walls of the frame receiving groove is controlled within a suitable range, and the gap will not be too large to affect the strength of the outer side of the frame, nor will it be too small to affect the welding between the frames and cause the outer side walls of the frame receiving groove to melt and weld and produce overflow.

[0010] Preferably, the frame is provided with a liquid inlet groove and a liquid outlet groove, the liquid inlet groove and the liquid inlet port of the frame are interconnected to form a liquid inlet channel, the liquid inlet groove and the exhaust port of the frame are interconnected to form an exhaust channel, and the liquid outlet groove and the liquid outlet of the frame are interconnected to form a liquid outlet channel.

[0011] Preferably, a frame sealing protrusion is provided on the edge of the frame.

[0012] Preferably, the frame includes a first frame near the frame liquid inlet and the frame exhaust port, a second frame near the frame liquid outlet, and a third frame for connecting the first frame and the second frame, and the first frame, the second frame and the third frame are all provided with the frame sealing protrusion. The frame sealing protrusion can seal the surrounding of the frame to ensure the sealing performance of the frame edge.

[0013] Preferably, the frame sealing protrusion includes at least two welded edge seals, and an overflow groove with a maximum width of 0.5-5 mm is provided between the welded edge seals. The fixed connection is performed by multiple welded edge seals to avoid the structural stability of the deep filter assembly being affected by the insufficient fixed connection effect of a single welded edge seal. The overflow generated by the welded edge seal during the welding process can be quickly filled in the overflow groove, thereby improving the connection effect of the frame sealing protrusion. At the same time, the welded edge seals with appropriate spacing can strengthen the fixed connection of the frame sealing protrusion and ensure the structural strength of the deep filter assembly.

[0014] Preferably, the width of the top of the welded edge is smaller than the width of the bottom; and / or, the opposite side of the welded edge is an inclined surface. At the beginning of the fixed connection, the top of the welded edge has a traction effect, which can guide the material to flow into the overflow groove. On the basis of the small width of the top of the welded edge, the inclined surface can further improve the drainage effect of the welded edge, so that the overflow of the welded edge can flow to the overflow groove more concentratedly when the welded edge is fixedly connected.

[0015] Preferably, the inner periphery of the first frame corresponding to the liquid inlet side of the deep filter medium and the inner periphery of the second frame corresponding to the liquid outlet side of the deep filter medium are both provided with flow grooves. The flow grooves are provided to connect the liquid inlet side and the liquid outlet side of the deep filter medium with the corresponding through holes, so as to facilitate the smooth inflow and outflow of the feed liquid.

[0016] Preferably, a plurality of flow protrusions are arranged at intervals on the flow groove, and the circumferential length of the flow protrusions along the frame is 8-20 mm. The arrangement of the flow protrusions further improves the connection strength of the frame to the outer periphery of the deep filter medium, thereby ensuring the overall structural stability.

[0017] A flat deep filter assembly comprises two end plates and a deep filter unit, wherein at least one of the deep filter units is disposed between the two end plates, wherein the end plates are provided with an end plate liquid inlet, an end plate liquid outlet and an end plate exhaust port which are connected to the frame liquid inlet, the frame liquid outlet and the frame exhaust port respectively, wherein the end plates are provided with an end plate receiving groove corresponding to the position of the frame receiving groove, and the deep filter unit is fixedly connected to the end plates.

[0018] Preferably, a frame sealing protrusion is provided on the outer periphery of the frame, and an end plate sealing protrusion corresponding to the position of the frame sealing protrusion is provided on the end plate.

[0019] The beneficial effects of the utility model are: (1) the overflow generated during the welding process is stored by the frame receiving groove, and the overflow is restricted from flowing to the outside of the outer edge of the frame, thereby ensuring that the outer edge of the deep filter assembly after welding is flat; (2) a fixed connection is performed by multiple welding edge seals, thereby improving the connection stability and sealing of the overall structure; (3) the overflow grooves between the welding edge seals are used to prevent excessive overflow from affecting the flow channel, thereby improving the structural stability of the deep filter assembly and ensuring the filtration stability of the deep filter assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the liquid inlet side of Example 1 of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the liquid outlet side of Example 1 of the utility model;

[0022] Figure 3 It is a cross-sectional view of Example 1 of the utility model;

[0023] Figure 4 This utility model Figure 3 A partial enlarged view of the middle A;

[0024] Figure 5 It is a cross-sectional view of the frame position of Example 2 of the utility model;

[0025] Figure 6 It is a cross-sectional view of the frame position of Example 3 of the utility model;

[0026] Figure 7 It is a cross-sectional view of the frame position of Example 4 of the utility model;

[0027] Figure 8 It is a structural schematic diagram of Embodiment 5 of the present utility model;

[0028] Fig. 9 It is a schematic diagram of the structural decomposition of Embodiment 5 of the present utility model;

[0029] Fig.10 It is a structural schematic diagram of embodiment 6 of the present utility model.

[0030] In the figure: deep filtration unit 1, frame liquid inlet 1a, frame exhaust port 1b, frame liquid outlet 1c, frame 10, first frame 10a, third frame 10b, second frame 10c, liquid inlet groove 10d, liquid outlet groove 10e, circulation groove 102, circulation protrusion 103, frame receiving groove 11, outer side wall 11a, inner side wall 11b, frame sealing protrusion 12, welding edge 12a, overflow groove 12b, deep filtration medium 2, end plate 3, end plate liquid inlet 3a, end plate exhaust port 3b, end plate liquid outlet 3c, end plate receiving groove 31, end plate sealing protrusion 32. DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Example 1

[0033] like Figure 1 , Figure 2In the illustrated embodiment, a flat deep filter unit includes a deep filter medium 2 and a frame 10. The frame 10 is provided with a frame liquid inlet 1a and a frame air outlet 1b connected to the liquid inlet side of the deep filter medium 2. The frame 10 is provided with a frame liquid outlet 1c connected to the liquid outlet side of the deep filter medium 2. The frame 10 includes a first frame 10a close to the frame liquid inlet 1a and the air outlet, a second frame 10c close to the frame liquid outlet 1c, and a third frame 10b for connecting the first frame 10a and the second frame 10c. The first frame 10a, the second frame 10c and the third frame 10b are all provided with a frame sealing protrusion 12. The frame 10 and the deep filter medium 2 are sealed and connected to each other at the periphery, thereby forming a deep filter unit 1. The frame 10 is provided with a liquid inlet groove 10d and a liquid outlet groove 10e. The liquid inlet groove 10d is connected to the frame liquid inlet 1a to form a liquid inlet channel, the liquid inlet groove 10d is connected to the exhaust port to form an exhaust channel, and the liquid outlet groove 10e is connected to the frame liquid outlet 1c to form a liquid outlet channel. When the material enters the deep filter unit 1 from the frame liquid inlet 1a, the permeate is obtained through the filtering action of the deep filter medium 2, and the permeate is discharged from the deep filter unit 1 along the frame liquid outlet 1c, while the bubbles generated during the filtration and the bubbles mixed in the material are discharged from the deep filter unit 1 along the exhaust port.

[0034] like Figure 1 , Figure 2 As shown, the inner periphery of the first frame 10a corresponding to the liquid inlet side of the deep filter medium 2 and the inner periphery of the second frame 10c corresponding to the liquid outlet side of the deep filter medium 2 are both provided with flow grooves 102. The provision of the flow grooves 102 can ensure that the liquid inlet channel and the exhaust channel are connected to the liquid inlet side of the deep filter medium 2, and the liquid outlet channel is connected to the liquid outlet side of the deep filter medium 2. A plurality of flow protrusions 103 are provided at intervals on the flow grooves 102, and the circumferential length of the flow protrusions 103 along the frame 10 is 8-20 mm. The provision of the flow protrusions 103 further improves the connection strength of the frame 10 at the outer periphery of the deep filter medium 2, and ensures the structural stability of the deep filter unit 1 and the deep filter assembly after welding and fixing. When the circumferential length of the flow protrusion 103 along the frame 10 is less than 8 mm, the flow protrusion 103 is not sufficient to effectively improve the structural stability of the deep filtration unit 1 and the deep filtration assembly. At the same time, when the material flows through the flow protrusion 103, the too small flow protrusion 103 is likely to cause turbulence effect of the high flow rate material, resulting in reduced filtration stability; when the circumferential length of the flow protrusion 103 along the frame 10 is greater than 20 mm, a large amount of overflow occurs when the flow protrusion 103 is welded and fixed, affecting the flowability of the flow groove 102.

[0035] Combination Figure 3 , Figure 4As shown, the outer edges of both sides of the frame 10 which are parallel or approximately parallel to the deep filter medium 2 are provided with frame receiving grooves 11. When the welding is fixedly connected, the overflow flows into the frame receiving grooves 11, thereby limiting the overflow from flowing to the outer edge of the frame 10, thereby ensuring that the outer edge of the frame 10 and the outer edge of the formed deep filter assembly are relatively flat.

[0036] The width of the frame receiving groove 11 is 0.5-5mm, and the depth of the frame receiving groove 11 is 0.4-4mm. The width and depth of the frame receiving groove 11 are within a suitable range, which can not only ensure that the strength of the frame 10 is not affected, but also ensure the volume of the frame receiving groove 11, so as to facilitate the storage of more overflow materials.

[0037] In this embodiment, the height of the outer side wall 11a of the frame receiving groove 11 is lower than the height of the inner side wall 11b. Since the height of the outer side wall 11a of the frame receiving groove 11 is lower than the inner side wall 11b of the frame receiving groove 11, there is a gap between the outer side walls 11a of the frame receiving groove 11 of adjacent deep filter units 1 during the welding process, and melting will not occur during the welding process, which is conducive to reducing the generation of overflow, and is therefore suitable for scenes with high requirements for the flatness of the outer edge of the frame 10. When the bottom of the frame receiving groove 11 is irregular or horizontal, the heights of the outer side wall 11a and the inner side wall 11b are both relative heights, that is, the heights of the outer ends of the outer side wall 11a and the inner side wall 11b from the lowest point of the bottom of the frame receiving groove 11.

[0038] The ratio of the height of the outer side wall 11a of the frame receiving groove 11 to the height of the inner side wall 11b of the frame receiving groove 11 is 0.3-0.9. When the ratio is lower than 0.3, the gap between the outer side walls 11a of the frame receiving groove 11 of adjacent deep filter units 1 is large, and a large gap is likely to exist after welding, affecting the strength of the outer side of the frame 10; when the ratio is higher than 0.9, the gap between the outer side walls 11a of the frame receiving groove 11 of adjacent deep filter units 1 is small, which will affect the welding between the frames 10 or the outer side walls 11a are prone to melt welding, resulting in overflow and affecting the flatness of the outer side.

[0039] In this embodiment, the outer edge and the inner edge of the frame 10 are provided with a frame sealing protrusion 12, each frame sealing protrusion 12 is provided with two welding edge seals 12a, and an overflow groove 12b is provided between the welding edge seals 12a on the same frame sealing protrusion 12, and the maximum width of the overflow groove 12b is 0.5-5mm. When the maximum width of the overflow groove 12b is less than 0.5mm, the width of the overflow groove 12b is not enough to provide overflow space for the welding edge seal 12a, and the accumulated overflow makes the contact area between the welding edge seals 12a insufficient during the fixed connection or the flatness of the fixed connection between the welding edge seals 12a is reduced, affecting the structural stability of the deep filter assembly; when the maximum width of the overflow groove 12b is greater than 5mm, the width of the overflow groove 12b is too large, and there is a large gap between the welding edge seals 12a, resulting in insufficient connection strength of the frame sealing protrusions 12 between adjacent deep filter units 1, resulting in an increased risk of damage to the deep filter assembly; when the maximum width of the overflow groove 12b is 0.5-5mm, the overflow generated by the welding edge seal 12a during the welding process can quickly fill the overflow groove 12b, thereby improving the connection effect of the frame sealing protrusion 12. At the same time, the fixed connection of the frame sealing protrusion 12 between the welding edge seals 12a can be strengthened to ensure the structural strength of the deep filter assembly.

[0040] During the actual filtration process, the material passes through the liquid inlet 1a of the frame and the liquid inlet channel, and then is distributed into the deep filtration unit 1 through the flow grooves 102 on the inner periphery of the first frame 10a on the liquid inlet side, and forms permeate under the filtration of the deep filtration medium 2. The permeate is discharged to the liquid outlet channel through the flow grooves 102 on the inner periphery of the second frame 10c on the liquid outlet side, and finally discharged from the deep filtration unit 1 from the frame liquid outlet 1c through the liquid outlet channel, wherein the residual liquid remaining after the material is filtered and the bubbles in the material are discharged from the deep filtration component along the exhaust channel through the frame exhaust port 1b.

[0041] Example 2

[0042] The difference between Example 2 and Example 1 is that Figure 5 As shown, the outer wall 11a and the inner wall 11b of the frame receiving groove 11 have the same height, and the thickness of the outer wall 11a of the frame receiving groove 11 is 0.1-1.5mm. When the thickness of the outer wall 11a is less than 0.1mm, the strength of the outer wall 11a is too low and it is easy to be damaged when it is hit; when the thickness is greater than 1.5mm, it is easy to produce overflow when the outer wall 11a is welded, and it is difficult to ensure that the outer edge is neat. The height of the outer wall 11a and the inner wall 11b of the frame receiving groove 11 is consistent, which is conducive to ensuring the depth of the frame receiving groove 11, so that more overflow can be stored.

[0043] Example 3

[0044] The difference between Example 3 and Example 1 is that Figure 6 As shown, the width of the top of the welding edge 12a is smaller than the width of the bottom, and the side opposite to the welding edge 12a is an inclined surface. By setting the width of the welding edge 12a to change from the top to the bottom, the width of the overflow groove 12b is the largest at the top of the welding edge 12a. At the beginning of the fixed connection, the top of the welding edge 12a has a traction effect, which can guide the material to flow into the overflow groove 12b. The design of the inclined surface improves the drainage effect of the welding edge 12a, so that the overflow of the welding edge 12a can flow more concentratedly to the overflow groove 12b when the welding edge 12a is fixedly connected.

[0045] Example 4

[0046] The difference between Example 4 and Example 1 is that Figure 7 As shown, a single welding edge 12a is provided on the frame sealing protrusion 12, and no overflow groove 12b is provided. For use scenarios such as small size or less serious overflow, the frame receiving groove 11 is sufficient to store the overflow generated by welding, and the overflow groove 12b may not be provided in this case, thereby reducing the difficulty of forming the frame 10 and the difficulty of the welding process, which is conducive to reducing production costs.

[0047] Example 5

[0048] A flat depth filter element, such as Figure 8 , Fig. 9 As shown, it includes two end plates 3, a deep filter unit 1 is arranged between the two end plates 3, and the deep filter unit 1 is fixedly connected to the end plates 3, and the fixed connection can be connected by ultrasonic welding, hot melt welding and other connection methods. The end plate 3 is provided with an end plate liquid inlet 3a, an end plate liquid outlet 3c and an end plate exhaust port 3b. When the end plate 3 is welded to the deep filter unit 1, the combination is as shown in FIG. Figure 1 As shown, the end plate liquid inlet 3a is connected to the frame liquid inlet 1a, and the end plate liquid outlet 3c is connected to the frame liquid outlet 1c. The end plate exhaust port 3b is connected to the frame exhaust port 1b, and the end plate 3 is provided with an end plate receiving groove 31 corresponding to the position of the frame receiving groove 11, so as to store the overflow generated when the end plate 3 and the deep filter unit 1 are welded and fixed.

[0049] like Fig. 9 As shown, the outer periphery of the frame 10 is provided with a frame sealing protrusion 12, and the end plate 3 is provided with an end plate sealing protrusion 32 corresponding to the position of the frame sealing protrusion 12. When welding and fixing, the frame sealing protrusion 12 and the end plate sealing protrusion 32 are welded correspondingly, thereby ensuring the sealing effect between the end plate 3 and the deep filter unit 1.

[0050] In addition, reinforcing ribs are provided on the outer side of the end plate 3 to improve the mechanical strength of the end plate 3 and prevent the end plate 3 from being deformed due to excessive pressure inside the deep filter assembly and thus destroying the structural stability and filtering performance of the deep filter assembly.

[0051] In the actual filtering process, the material enters the deep filter assembly through the end plate liquid inlet 3a, and becomes permeate after being filtered by the deep filter medium 2 inside the deep filter unit 1. The permeate is finally discharged from the deep filter assembly from the end plate liquid outlet 3c, wherein the residual liquid remaining after the material is filtered and the bubbles in the material are discharged from the deep filter assembly through the end plate exhaust port 3b.

[0052] Example 6

[0053] The difference between Example 6 and Example 1 is that Fig.10 As shown, a plurality of deep filter units 1 are arranged between the two end plates 3, and the deep filter units 1 are stacked, and the liquid inlet sides of the adjacent deep filter units 1 correspond to each other or the liquid outlet sides are welded and fixed. After the adjacent deep filter units 1 and the end plate 3 and the deep filter unit 1 are welded and fixed, in the actual filtering process, the material enters the deep filter assembly through the end plate liquid inlet 3a, passes through each deep filter unit 1 in turn, and forms a permeate under the filtration of the deep filter medium 2. The permeate is finally discharged from the deep filter assembly from the end plate liquid outlet 3c, wherein the residual liquid remaining after the material is filtered and the bubbles in the material are discharged from the deep filter assembly through the end plate exhaust port 3b.

[0054] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A flat deep filter unit, comprising a deep filter medium (2) and a frame (10), wherein the frame (10) and the deep filter medium (2) are sealed at their peripheries, the frame (10) is provided with a frame liquid inlet (1a) and a frame exhaust port (1b) communicating with a liquid inlet side of the deep filter medium (2), and the frame (10) is provided with a frame liquid outlet (1c) communicating with a liquid outlet side of the deep filter medium (2), wherein: The frame (10) is provided with a frame receiving groove (11) parallel to or approximately parallel to at least one side outer edge of the deep filter medium (2).

2. A flat deep filter unit according to claim 1, characterized in that: The width of the frame receiving groove (11) is 0.5-5 mm, the depth of the frame receiving groove (11) is 0.4-4 mm; and / or the thickness of the outer side wall (11a) of the frame receiving groove (11) is 0.1-1.5 mm.

3. A flat deep filter unit according to claim 1, characterized in that: The height of the outer side wall (11a) of the frame receiving groove (11) is lower than the height of the inner side wall (11b).

4. A flat depth filter unit according to claim 3, characterized in that: The ratio of the height of the outer side wall (11a) of the frame receiving groove (11) to the height of the inner side wall (11b) is 0.3-0.

9.

5. A flat depth filter unit according to claim 1, characterized in that: The frame (10) is provided with a liquid inlet groove (10d) and a liquid outlet groove (10e); the liquid inlet groove (10d) and the frame liquid inlet port (1a) are interconnected to form a liquid inlet channel; the liquid inlet groove (10d) and the frame exhaust port (1b) are interconnected to form an exhaust channel; and the liquid outlet groove (10e) and the liquid outlet port are interconnected to form a liquid outlet channel.

6. A flat depth filter unit according to claim 1, characterized in that: A frame sealing protrusion (12) is provided on the edge of the frame (10).

7. A flat depth filter unit according to claim 6, characterized in that: The frame (10) comprises a first frame (10a) close to a frame liquid inlet (1a) and a frame exhaust port (1b), a second frame (10c) close to a liquid outlet, and a third frame (10b) used to connect the first frame (10a) and the second frame (10c), wherein the first frame (10a), the second frame (10c) and the third frame (10b) are all provided with the frame sealing protrusion (12).

8. A flat depth filter unit according to claim 6, characterized in that: The frame sealing protrusion (12) comprises at least two welded edges (12a), and an overflow groove (12b) with a maximum width of 0.5-5 mm is provided between the welded edges (12a).

9. A flat depth filter unit according to claim 8, characterized in that: The width of the top of the welding edge seal (12a) is smaller than the width of the bottom; and / or the opposite side of the welding edge seal (12a) is an inclined slope.

10. A flat depth filter unit according to claim 7, characterized in that: The inner periphery of the first frame (10a) corresponding to the liquid inlet side of the deep filter medium (2) and the inner periphery of the second frame (10c) corresponding to the liquid outlet side of the deep filter medium (2) are both provided with flow grooves (102).

11. A flat depth filter unit according to claim 10, characterized in that: A plurality of circulation protrusions (103) are arranged at intervals on the circulation groove (102), and the circumferential length of the circulation protrusions (103) along the frame (10) is 8-20 mm.

12. A flat deep filter assembly, comprising two end plates (3) and a deep filter unit (1) according to any one of claims 1 to 11, characterized in that: At least one of the deep filter units (1) is disposed between the two end plates (3); the end plate (3) is provided with an end plate liquid inlet (3a), an end plate liquid outlet (3c) and an end plate air outlet (3b) which are correspondingly connected to the frame liquid inlet (1a), the frame liquid outlet (1c) and the frame air outlet (1b); the end plate (3) is provided with an end plate receiving groove (31) corresponding to the position of the frame receiving groove (11); and the deep filter unit (1) is fixedly connected to the end plate (3).

13. A flat depth filter assembly according to claim 12, characterized in that: The outer periphery of the frame (10) is provided with a frame sealing protrusion (12), and the end plate (3) is provided with an end plate sealing protrusion (32) corresponding to the position of the frame sealing protrusion (12).

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