Buffer cover plate assembly of impregnation equipment

Abstract

The utility model discloses a buffer cover plate assembly of impregnation equipment. The buffer cover plate assembly comprises a cover plate body and a buffer filter assembly arranged in the cover plate body, the cover plate body comprises a frame and a bottom plate, a plurality of through holes are formed in the bottom plate, and the impregnation liquid flows from the buffer filtering assembly to the bottom plate; the buffer filtering assembly sequentially comprises a first filtering piece, a second filtering piece and a third filtering piece, the third filtering piece is adjacent to the bottom plate, buffer protruding structures are arranged on the second filtering piece and the third filtering piece, and the sizes of the buffer protruding structures are gradually increased in the liquid flowing direction. According to the buffer cover plate assembly of the impregnation equipment, the effects of separating bubbles, filtering impurities and reducing the flow speed and buffering the fluctuation of the liquid level can be achieved at the same time, the liquid level is smooth and free of bubbles after liquid is added into an impregnation tank, and the problem that products are impregnated with glue due to surging of the liquid is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the manufacturing technical field of laminated aluminum electrolytic capacitor, especially relates to a kind of buffering cover plate assembly of impregnation equipment. BACKGROUND

[0002] Laminated aluminum electrolytic capacitor is a kind of capacitor using solid-state high-molecular conductive polymer as electrolyte, with miniaturization, high performance, high reliability and high environmental protection and other characteristics.Laminated aluminum electrolytic capacitor needs to involve multiple impregnation processes in preparation process, such as Chinese patent 201910768922.X discloses a kind of impregnation method of laminated solid-state aluminum electrolytic capacitor, comprising the following steps: first, the aluminum foil after formation treatment is impregnated with pretreatment agent using multi-section impregnation mode, and then dry treatment is carried out;Then, the aluminum foil after the above dry treatment is impregnated with conductive polymer dispersion liquid using multi-section impregnation mode, and then dry treatment is carried out;Then, the aluminum foil after the above dry treatment is impregnated with post-treatment agent using multi-section impregnation mode, and then dry treatment is carried out, that is, the impregnation polymerization treatment of aluminum foil is completed.Obviously, impregnation is the key process in the production and preparation of laminated aluminum electrolytic capacitor, and bubbles and liquid level fluctuations are easy to occur during the addition of impregnation liquid, and impurities are easy to be produced during the preparation of impregnation liquid, so how to keep the liquid stable during the addition of liquid is a technical problem.

[0003] The cover plate structure of the impregnation equipment in the prior art is simple, although it can appropriately slow down the liquid level fluctuation during the impregnation process, the effect is not good, and it cannot remove the bubbles and particle impurities generated during the addition of liquid, such as Chinese patent 202021914354.4 discloses a sealed type capacitor impregnation machine, which comprises a rack, an impregnation device and a sealing device, wherein the sealing device comprises an impregnation upper cover arranged on the impregnation pool, an annular sealing ring arranged in the groove and a gas pressure mechanism for inflating and deflating the annular sealing ring, and the size of the impregnation upper cover is the same as that of the upper surface of the impregnation pool.The impregnation upper cover in the patent is a simple cover plate structure, and the buffering effect on the liquid surface is not good, and there is no filtering effect.

[0004] Therefore, it is necessary to provide a buffering cover plate assembly suitable for impregnation equipment, which has excellent buffering effect and filtering effect. UTILITY MODEL CONTENTS

[0005] Therefore, it is necessary to provide a buffering cover plate assembly suitable for impregnation equipment, which has excellent buffering effect and filtering effect.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A kind of buffer cover plate assembly of impregnation equipment, it includes: cover plate body and the buffer filter assembly in cover plate body;The cover plate body includes frame and bottom plate, the bottom plate is equipped with several through holes, and the flow direction of impregnation liquid is from buffer filter assembly to bottom plate;The buffer filter assembly includes first filter sheet, second filter sheet and third filter sheet in sequence, the third filter sheet is adjacent to the bottom plate, and buffer convex structure is arranged on the second filter sheet and third filter sheet, and the size of buffer convex structure gradually increases along the flow direction of liquid.

[0008] Further, the buffer convex structure is the first buffer convex on the second filter sheet and the second buffer convex on the third filter sheet.

[0009] Further, the second filter sheet is provided with uniformly arranged rectangular first liquid flow holes and first buffer convexes, and the first buffer convex is a hollow trapezoidal body convex formed by extending from the edge of the first liquid flow hole towards the first filter sheet.

[0010] Further, the third filter sheet is provided with uniformly arranged circular second liquid flow holes and second buffer convexes, and the second buffer convex is a conical hollow convex formed by extending from the edge of the second liquid flow hole towards the second filter sheet.

[0011] Further, the first buffer convex is provided with a first convex inlet at one end away from the first liquid flow hole, and the size of the first buffer convex gradually decreases from the first liquid flow hole to the first convex inlet.

[0012] Further, the second buffer convex is provided with a second convex inlet at one end away from the second liquid flow hole, and the diameter of the second buffer convex gradually decreases from the second liquid flow hole to the second convex inlet.

[0013] Further, the first filter sheet is provided with uniformly arranged rectangular filter holes in the central region.

[0014] Further, the first filter sheet is provided with 1-3 pieces.

[0015] Further, the aperture of the second liquid flow hole is smaller than the aperture of the through hole, and the distribution density of the second liquid flow hole on the third filter sheet is greater than the distribution density of the through hole on the bottom plate.

[0016] Further, the size of the filter hole is greater than the size of the first liquid flow hole.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] Compared with the prior art, the present application has the following advantages:The buffering cover plate assembly of the impregnation equipment provided by the utility model has the effects of separating bubbles, filtering impurities and reducing flow speed buffering liquid surface fluctuation, and after the buffering cover plate assembly of the liquid impregnation equipment flows into the impregnation tank, the liquid surface is flat and has no bubbles, and the problem of product impregnation and gluing caused by liquid surge does not occur. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The buffering cover plate assembly of the impregnation equipment provided by the utility model has the effects of separating bubbles, filtering impurities and reducing flow speed buffering liquid surface fluctuation, and after the buffering cover plate assembly of the liquid impregnation equipment flows into the impregnation tank, the liquid surface is flat and has no bubbles, and the problem of product impregnation and gluing caused by liquid surge does not occur.

[0020] Figure 2 The buffering cover plate assembly of the impregnation equipment provided by the utility model has the effects of separating bubbles, filtering impurities and reducing flow speed buffering liquid surface fluctuation, and after the buffering cover plate assembly of the liquid impregnation equipment flows into the impregnation tank, the liquid surface is flat and has no bubbles, and the problem of product impregnation and gluing caused by liquid surge does not occur.

[0021] Figure 3 The buffering cover plate assembly of the impregnation equipment provided by the utility model has the effects of separating bubbles, filtering impurities and reducing flow speed buffering liquid surface fluctuation, and after the buffering cover plate assembly of the liquid impregnation equipment flows into the impregnation tank, the liquid surface is flat and has no bubbles, and the problem of product impregnation and gluing caused by liquid surge does not occur. Figure 1

[0022] Figure 4 The buffering cover plate assembly of the impregnation equipment provided by the utility model has the effects of separating bubbles, filtering impurities and reducing flow speed buffering liquid surface fluctuation, and after the buffering cover plate assembly of the liquid impregnation equipment flows into the impregnation tank, the liquid surface is flat and has no bubbles, and the problem of product impregnation and gluing caused by liquid surge does not occur. Figure 2

[0023] Figure 5 The buffering cover plate assembly of the impregnation equipment provided by the utility model has the effects of separating bubbles, filtering impurities and reducing flow speed buffering liquid surface fluctuation, and after the buffering cover plate assembly of the liquid impregnation equipment flows into the impregnation tank, the liquid surface is flat and has no bubbles, and the problem of product impregnation and gluing caused by liquid surge does not occur. Figure 1

[0024] Figure 6 The buffering cover plate assembly of the impregnation equipment provided by the utility model has the effects of separating bubbles, filtering impurities and reducing flow speed buffering liquid surface fluctuation, and after the buffering cover plate assembly of the liquid impregnation equipment flows into the impregnation tank, the liquid surface is flat and has no bubbles, and the problem of product impregnation and gluing caused by liquid surge does not occur. Figure 5

[0025] The buffering cover plate assembly of the impregnation equipment provided by the utility model has the effects of separating bubbles, filtering impurities and reducing flow speed buffering liquid surface fluctuation, and after the buffering cover plate assembly of the liquid impregnation equipment flows into the impregnation tank, the liquid surface is flat and has no bubbles, and the problem of product impregnation and gluing caused by liquid surge does not occur. Figure 7 Figure 1 The buffering cover plate assembly of the impregnation equipment provided by the utility model has the effects of separating bubbles, filtering impurities and reducing flow speed buffering liquid surface fluctuation, and after the buffering cover plate assembly of the liquid impregnation equipment flows into the impregnation tank, the liquid surface is flat and has no bubbles, and the problem of product impregnation and gluing caused by liquid surge does not occur.

[0026] Figure 8 Figure 2 The buffering cover plate assembly of the impregnation equipment provided by the utility model has the effects of separating bubbles, filtering impurities and reducing flow speed buffering liquid surface fluctuation, and after the buffering cover plate assembly of the liquid impregnation equipment flows into the impregnation tank, the liquid surface is flat and has no bubbles, and the problem of product impregnation and gluing caused by liquid surge does not occur.

[0027] Figure 9 The buffering cover plate assembly of the impregnation equipment provided by the utility model has the effects of separating bubbles, filtering impurities and reducing flow speed buffering liquid surface fluctuation, and after the buffering cover plate assembly of the liquid impregnation equipment flows into the impregnation tank, the liquid surface is flat and has no bubbles, and the problem of product impregnation and gluing caused by liquid surge does not occur. Figure 8

[0028] The buffering cover plate assembly of the impregnation equipment provided by the utility model has the effects of separating bubbles, filtering impurities and reducing flow speed buffering liquid surface fluctuation, and after the buffering cover plate assembly of the liquid impregnation equipment flows into the impregnation tank, the liquid surface is flat and has no bubbles, and the problem of product impregnation and gluing caused by liquid surge does not occur. Figure 10 Figure 1 The buffering cover plate assembly of the impregnation equipment provided by the utility model has the effects of separating bubbles, filtering impurities and reducing flow speed buffering liquid surface fluctuation, and after the buffering cover plate assembly of the liquid impregnation equipment flows into the impregnation tank, the liquid surface is flat and has no bubbles, and the problem of product impregnation and gluing caused by liquid surge does not occur.​​​​​​

[0029] Figure 11 The third filter piece structure of the buffer cover plate assembly of the impregnation equipment is provided Figure 2 ;

[0030] Figure 12 The third filter piece structure of the buffer cover plate assembly of the impregnation equipment is provided Figure 11 The third filter piece structure of the buffer cover plate assembly of the impregnation equipment is provided

[0031] The marks in the figure are as follows:

[0032] Cover plate body 1, frame 11, bottom plate 12, aluminum sheet clamping groove 111, through hole 121;

[0033] First filter piece 2, filter hole 21;

[0034] Second filter piece 3, first liquid flow hole 31, first buffer protrusion 32, first protrusion inlet 321;

[0035] Third filter piece 4, second liquid flow hole 41, second buffer protrusion 42, second protrusion inlet 421. DETAILED DESCRIPTION

[0036] In order to make the person skilled in the art better understand the utility model scheme, the technical scheme in the utility model embodiment will be described clearly and completely below in conjunction with the drawings in the utility model embodiment. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.

[0037] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as a limitation of the utility model.

[0038] In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implying the number of the indicated technical features. Therefore, the features defined as "first", "second", "third" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0039] As described in the background, the cover plate of the existing impregnation equipment has poor buffering effect, lacks filtering effect, and cannot meet the increasingly high standard of the production requirements of laminated aluminum electrolytic capacitor.

[0040] In order to solve this technical problem, the utility model provides a buffering cover plate of impregnation equipment, which is applied to the impregnation equipment of aluminum electrolytic capacitor.

[0041] Specifically, please refer to Figures 1-12 , the buffering cover plate assembly of the impregnation equipment specifically includes:

[0042] A buffering cover plate assembly of impregnation equipment includes: a cover plate body 1 and a buffering filter assembly arranged in the cover plate body 1;The cover plate body 1 includes a frame 11 and a bottom plate 12, the bottom plate 12 is provided with a plurality of through holes 121, the flow direction of impregnation liquid is from the buffering filter assembly to the bottom plate 12;The buffering filter assembly includes a first filter sheet 2, a second filter sheet 3 and a third filter sheet 4 in turn, the third filter sheet 4 is arranged adjacent to the bottom plate 12, the second filter sheet 3 and the third filter sheet 4 are provided with buffering convex structures, and the size of the buffering convex structure gradually increases in the liquid flow direction.

[0043] The buffering cover plate assembly of impregnation equipment provided by the utility model filters and buffers the bubbles and impurities in the impregnation liquid in the impregnation tank from bottom to top by setting the buffering filter assembly, the buffering filter assembly is composed of multiple filter sheets, and the liquid is filtered and buffered layer by layer, wherein the second filter sheet 3 and the third filter sheet 4 are both provided with buffering convex structures protruding in the opposite direction of the water flow direction, the bubbles and particulate impurities are blocked on the upstream side of the liquid flow direction through the structure that the size of the buffering convex structure gradually increases in the liquid flow direction, and finally the through holes 121 of the bottom plate 12 flow out, the liquid is smooth and undulating during the adding process, and the influence of bubbles and solid particles on the impregnation effect of the capacitor is avoided.

[0044] In order to enable the personnel in the technical field to better understand the utility model scheme, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings.

[0045] It should be noted that the embodiments in the utility model and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0046] It should be noted that like reference numerals and letters refer to like items throughout the several views, and once an item is defined in one view, it need not be further defined and explained in the subsequent views.

[0047] Embodiment 1

[0048] Please refer to Figures 1-12 A buffer cover plate assembly of impregnation equipment, which comprises a cover plate body 1 and a buffer filter assembly installed in the cover plate body 1, in use, the impregnation liquid flows from the buffer filter assembly side of the buffer cover plate assembly from bottom to top, passes through the buffer filter assembly to filter bubbles and fine particles, and at the same time, the buffer liquid surface fluctuates to ensure the stability of the capacitor impregnation step.

[0049] Specifically, as shown in the drawings, Figures 1-4 The cover plate body 1 is a frame structure, which comprises a frame 11 and a bottom plate 12, the bottom plate 12 is a rectangular structure, the bottom plate 12 and the buffer filter assembly are fixed on the frame 11 in sequence, and a plurality of through holes 121 are arranged on the bottom plate 12, further, the through holes 121 are circular and penetrate through the bottom plate 12, in use, the impregnation liquid flows from the buffer filter assembly side from bottom to top, and after removing bubbles and fine particles in the buffer filter assembly, it flows to the bottom plate 12 and then flows out of the buffer cover plate assembly through the through holes 121 of the bottom plate 12. Further, the through holes 121 are uniformly distributed on the bottom plate 12, in the embodiment, the diameter of the through holes 121 is 3mm-8mm.

[0050] Further, the buffer filter assembly comprises a first filter sheet 2, a second filter sheet 3 and a third filter sheet 4 in sequence, the third filter sheet 4 is arranged adjacent to the bottom plate 12, and the first filter sheet 2 is arranged away from the bottom plate 12, liquid flows from the first filter sheet 2 to the second filter sheet 3 and the third filter sheet 4 in sequence, and finally flows out from the through holes 121 of the bottom plate 12 to complete the filtration.

[0051] Further, the first filter sheet 2, the second filter sheet 3 and the third filter sheet 4 are all rectangular sheet structures, the size of which is adapted to the frame 11, the frame 11 is provided with aluminum sheet clamping grooves 111 on the two sides corresponding to the frame 11, and the first filter sheet 2, the second filter sheet 3 and the third filter sheet 4 are clamped on the frame 11 from bottom to top in sequence.

[0052] Further, as shown in the drawings, Figures 5-6As shown, the central area of ​​the first filter element 2 is provided with uniformly arranged filter holes 21. The filter holes 21 are rectangular through holes that penetrate the first filter element 2. Liquid slowly enters the buffer filter assembly from the filter holes 21 of the first filter element 2 and flows towards the second filter element 3. In this embodiment, the length of the rectangular filter hole 21 is 10mm to 20mm, the width is 1mm to 3mm, and the number of filter holes 21 is greater than 50.

[0053] Furthermore, the first filter element 2 can be a single element or multiple elements, preferably 1 to 3 elements. In this embodiment, a structure of 2 first filter elements 2 stacked together is adopted, which can increase the slowing effect of the first filter element 2 on the liquid.

[0054] Furthermore, such as Figures 7-9 As shown, the second filter 3 is provided with uniformly arranged first liquid flow holes 31 and first buffer protrusions 32. The first liquid flow holes 31 are rectangular through holes penetrating the second filter 3. The first buffer protrusions 32 are hollow trapezoidal protrusions formed by extending from the edge of the first liquid flow holes 31 toward the first filter 2. One end of the first buffer protrusions 32 away from the first liquid flow holes 31 is provided with a first protrusion inlet 321. The first protrusion inlet 321 is also rectangular. After the liquid flows out from the filter hole 21 of the first filter 2, it flows into the first buffer protrusion 32 from the first protrusion inlet 321, and then flows out from the first liquid flow holes 31, continuing to flow toward the third filter 4.

[0055] Furthermore, the trapezoidal shape of the first buffer protrusion 32 gradually decreases in size from the first liquid flow hole 31 to the first protrusion inlet 321. This structure effectively eliminates larger air bubbles and filters larger solid particles when liquid enters through the first protrusion inlet 321. In this embodiment, the length of the first liquid flow hole 31 is 3mm to 5mm, the protrusion height of the first buffer protrusion 32 is 20mm to 60mm, and the size of the filter hole 21 is larger than the size of the first liquid flow hole 31.

[0056] Furthermore, such as Figures 10-12 As shown, the third filter 4 is provided with uniformly arranged second liquid flow holes 41 and second buffer protrusions 42. The second liquid flow holes 41 are circular through holes. The second buffer protrusions 42 are hollow cone-shaped protrusions that extend from the edge of the second liquid flow holes 41 toward the second filter 3. The second buffer protrusions 42 are provided with a second protrusion inlet 421 at one end away from the second liquid flow holes 41. Liquid flows into the second buffer protrusions 42 from the second protrusion inlet 421 and finally flows from the second liquid flow holes 41 to the bottom plate 12.

[0057] Further, the taper shape of the second buffer protrusion 42 gradually decreases in diameter from the second liquid flow hole 41 to the second protrusion inlet 421, when the liquid passes through the second buffer protrusion 42, on the one hand, the bubbles move upward under the push of buoyancy, and are retained between the second filter sheet 3 and the third filter sheet 4, on the other hand, the fine particulate solid is blocked outside the second protrusion inlet 421 with smaller size, and the liquid completes the filtration and flows to the bottom plate 12. In the embodiment, the diameter of the second liquid flow hole 41 is 1mm-3mm, the diameter of the second protrusion inlet 421 is 0.5mm-1mm, and the length of the second buffer protrusion inlet 321 is 0.5mm-2mm.

[0058] Further, the aperture of the second liquid flow hole 41 is smaller than the aperture of the through hole 121, and the distribution density of the second liquid flow hole 41 on the third filter sheet 4 is greater than the distribution density of the through hole 121 on the bottom plate 12.

[0059] The use process of the buffer cover plate assembly of the impregnation equipment is as follows: the impregnation liquid flows from below the buffer cover plate assembly to the impregnation tank, the impregnation liquid first enters the buffer filter assembly from the filter hole 21 of the first filter sheet 2, after the liquid flow rate is reduced by the two layers of first filter sheets 2, the liquid enters the first buffer protrusion 32 of the second filter sheet 3 from the first protrusion inlet 321, the first filtration of large bubbles and solid particles is completed, after the liquid flows out from the first liquid flow hole 31, the liquid enters the second buffer protrusion 42 from the second protrusion inlet 421, the second filtration of bubbles and fine particles is completed, and finally the impregnation liquid bubbles disappear completely and the liquid level fluctuation is also reduced to the minimum after the liquid flows out from the second liquid flow hole 41 to the through hole 121.

[0060] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integral; can be mechanical connection, also can be electric connection or each other can communicate; can be direct connection, also can pass through intermediate medium indirectly connect, can be two element inside communication or two element interaction relation, unless another definite limitation. For ordinary skilled in the art, the above terms can be understood according to specific circumstances the specific meaning of the utility model in.

[0061] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments, and the preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or equivalently replace some of the technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly used in other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A buffer cover assembly for an impregnation device, characterized in that, It includes: The cover plate body (1) and the buffer filter assembly disposed in the cover plate body (1); the cover plate body (1) includes a frame (11) and a bottom plate (12), the bottom plate (12) is provided with a plurality of through holes (121), and the impregnated liquid flows from the buffer filter assembly to the bottom plate (12); the buffer filter assembly includes a first filter (2), a second filter (3) and a third filter (4) in sequence, the third filter (4) is disposed adjacent to the bottom plate (12), the second filter (3) and the third filter (4) are provided with buffer protrusion structures, and the size of the buffer protrusion structures gradually increases with the direction of liquid flow.

2. The buffer cover assembly of the impregnation equipment according to claim 1, characterized in that, The buffer protrusion structure consists of a first buffer protrusion (32) on the second filter (3) and a second buffer protrusion (42) on the third filter (4).

3. The buffer cover assembly of the impregnation equipment according to claim 2, characterized in that, The second filter (3) is provided with uniformly arranged rectangular first liquid flow holes (31) and first buffer protrusions (32). The first buffer protrusions (32) are hollow trapezoidal protrusions that extend from the edge of the first liquid flow holes (31) toward the first filter (2).

4. The buffer cover assembly of the impregnation equipment according to claim 2, characterized in that, The third filter (4) is provided with uniformly arranged circular second liquid flow holes (41) and second buffer protrusions (42). The second buffer protrusions (42) are hollow cone-shaped protrusions that extend from the edge of the second liquid flow holes (41) toward the second filter (3).

5. The buffer cover assembly of the impregnation equipment according to claim 3, characterized in that, The first buffer protrusion (32) has a first protrusion inlet (321) at one end away from the first liquid flow hole (31), and the size of the first buffer protrusion (32) gradually decreases from the first liquid flow hole (31) to the first protrusion inlet (321).

6. The buffer cover assembly of the impregnation equipment according to claim 4, characterized in that, The second buffer protrusion (42) has a second protrusion inlet (421) at one end away from the second liquid flow hole (41), and the diameter of the second buffer protrusion (42) gradually decreases from the second liquid flow hole (41) to the second protrusion inlet (421).

7. The buffer cover assembly of the impregnation equipment according to claim 3, characterized in that, The first filter (2) has uniformly arranged rectangular filter holes (21) in the central area.

8. The buffer cover assembly of the impregnation equipment according to claim 7, characterized in that, The first filter (2) has 1 to 3 pieces.

9. The buffer cover assembly of the impregnation device according to claim 4, characterized in that, The diameter of the second liquid flow hole (41) is smaller than that of the through hole (121), and the distribution density of the second liquid flow hole (41) on the third filter plate (4) is greater than that of the through hole (121) on the bottom plate (12).

10. The buffer cover assembly of the impregnation equipment according to claim 8, characterized in that, The size of the filter hole (21) is larger than the size of the first liquid flow hole (31).

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