Filter paper frame matched with triangular funnel for use

Abstract

The utility model discloses a filter paper frame matched with a triangular funnel. The outer surface of the side wall of a filter paper frame body is matched with the inner side wall of the matched triangular funnel in shape. A plurality of supporting strips with longitudinal center lines intersecting with the central axis of the filter paper frame body are evenly distributed on the side wall of the filter paper frame body in the circumferential direction. A gap serving as a side wall hole channel is formed between every two adjacent supporting strips. The supporting strips are provided with outer side edges which protrude outwards from the side wall of the filter paper frame body so as to ensure that a gap is formed between the outer surface of the side wall of the filter paper frame and the inner side wall of the triangular funnel during use. The gap has two functions: firstly, the gap is used as a filtrate channel to accelerate the speed of filtrate passing through the filter paper, so that the filtering work efficiency is improved; air pressure balance inside and outside the filter paper is realized through the gap and pore channels on the side wall of the filter paper frame, and bubbles influencing the filtering speed are eliminated.

Description

Technical Field

[0001] The utility model relates to a filtering auxiliary device, in particular to a filtering auxiliary device matched with a triangular funnel. Background Art

[0002] The filter funnel is a solid-liquid separation device commonly used in laboratories and other places. The filter funnel is generally composed of a triangular funnel and filter paper placed inside the triangular funnel. The commonly used triangular funnel has a smooth inner wall. When the filter paper is placed inside the inner wall, the wet filter paper will fit tightly against the inner wall, and the filtrate flow space is very narrow. The liquid passing through the filter paper is difficult to flow smoothly downward, resulting in low filtration efficiency. On the other hand, because the wet filter paper is close to the inner wall of the funnel, it is generally necessary to use tools such as tweezers to remove the filter paper, which is inconvenient to operate.

[0003] The Chinese utility model with the authorization announcement number CN205549745U discloses a "funnel", the inner wall of which is provided with drainage grooves or columnar protrusions to form a drainage structure. During the filtering operation, since the drainage structure must have a concave-convex shape, a certain gap is maintained between part of the inner wall of the bucket and the wet filter paper. Compared with the structure in which the wet filter paper directly contacts the inner wall of the bucket, this funnel can reduce the surface tension between the filter paper and the inner wall of the bucket, thereby speeding up the speed at which the liquid passes through the filter paper. Its main disadvantage is that since the filter paper is easily deformed and displaced after being soaked, part of it enters between the filter paper and the drainage groove, or part of it enters between the filter paper and the columnar protrusions. After the deformation and displacement, the gap closed by the filter paper contains air (bubbles) that is difficult to discharge, and the filtration speed in these areas will actually decrease. Therefore, the effect of using this scheme to improve the filtration speed is still unsatisfactory. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a filter paper holder matched with a triangular funnel, which firstly further improves the filtering efficiency; and secondly makes it easier to take out the filter paper.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A filter paper holder used in conjunction with a triangular funnel comprises a filter paper holder body, wherein the outer surface of the side wall of the filter paper holder body is adapted to the shape of the inner side wall of the matching triangular funnel, the upper end is open and the lower end is provided with a through hole, a plurality of support bars whose longitudinal center lines intersect with the central axis of the filter paper holder body are evenly arranged on the side wall of the filter paper holder body in a circumferential direction; there is a gap between adjacent support bars as a side wall channel; the support bars have an outer side edge, and the outer side edge protrudes outward from the side wall of the filter paper holder body to ensure that there is a gap between the outer surface of the side wall of the filter paper holder and the inner side wall of the triangular funnel when in use.

[0007] Preferably, the inner side of the support bar is an arc-shaped bottom surface with the same curvature as the inner surface of the side wall of the filter paper holder body; the arc-shaped bottom surface is flush with the inner surface of the side wall of the filter paper holder body.

[0008] Further preferably, a row of auxiliary channels is provided on the support bar in an upper and lower arrangement.

[0009] Preferably, the inner side of the support bar has an inner edge, and the inner edge protrudes inwards.

[0010] Preferably, a handle is installed on the side wall of the filter paper holder body.

[0011] The positive effects of the utility model are:

[0012] First, due to the design of the support bar, and the outer edge of the support bar protruding outward from the side wall of the filter paper holder, there is a gap between the outer surface of the side wall of the filter paper holder and the inner wall of the triangular funnel when in use. The gap has two functions. One is that it serves as a filtrate channel to speed up the speed of the filtrate passing through the filter paper and improve the filtering efficiency; the second is that the air pressure balance inside and outside the filter paper is achieved through the gap and the hole channel on the side wall of the filter paper holder, eliminating bubbles that affect the filtering speed.

[0013] Second, since the side wall of the filter paper holder has side wall holes, the adhesion between the filter paper and the holder wall is relatively small. After flipping the holder with the opening facing downward, the filter paper can be easily poured out without the aid of auxiliary tools such as tweezers, thus simplifying the experimental operation.

[0014] Third, the laboratory purchases a filter paper holder of the utility model, which can be used in conjunction with multiple existing triangular funnels. For experiments with large filtration volume and high filtration speed requirements, the filter paper holder is used, and for experiments without filtration speed requirements, the original triangular funnel is used in a normal filtration mode. Therefore, the cost of using instruments in the application site is very small. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side structural schematic diagram of an embodiment of the utility model.

[0016] Figure 2 It is a schematic diagram of the top structure of an embodiment of the utility model.

[0017] Figure 3 It is a schematic diagram of an embodiment for showing the shape and position of the support bar in the embodiment of the utility model.

[0018] Figure 4 It is a schematic diagram of another embodiment for showing the shape and position of the support bar in the embodiment of the utility model.

[0019] Figure 5It is a schematic diagram of an embodiment for showing the shape and position of the support bars and the position of the auxiliary channels in an embodiment of the utility model.

[0020] In the figure: 1. filter paper holder body; 2. side wall hole; 3. support bar; 3-1. outer edge; 3-2. inner edge; 3-3. arc bottom surface; 3-4. auxiliary hole; 4. handle; 5. through hole. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the embodiments and drawings.

[0022] like Figure 1 and Figure 2 As shown, the embodiment of the filter paper holder of the utility model comprises a filter paper holder body 1, the outer surface of the side wall of the filter paper holder body 1 is adapted to the shape of the inner wall of the matching triangular funnel, the upper end is open and the lower end has a through hole 5. A handle 4 is installed on the side wall of the filter paper holder body 1. A plurality of support bars 3 whose longitudinal center lines intersect (extend lines intersect) with the central axis of the filter paper holder body 1 are evenly arranged on the side wall of the filter paper holder body 1. Figure 2 In this embodiment, the number of support bars 3 is eighteen. There is a gap between adjacent support bars 3 as the side wall channel 2. The support bar 3 has an outer edge 3-1, and the outer edge 3-1 protrudes outward from the side wall of the filter paper holder body 1 to ensure that there is a gap between the outer surface of the side wall of the filter paper holder and the inner wall of the triangular funnel when in use.

[0023] like Figure 3 As shown, in one embodiment, the inner side of the support bar 3 is an inner edge 3-2, and the inner edge 3-2 protrudes inwardly, and is located closer to the central axis of the filter paper holder body 1 than the inner surface of the side wall of the filter paper holder body 1. In other words, the cross section of the support bar 3 is a rhombus, the outer vertex protrudes outward, and the inner vertex protrudes inward to support the filter paper and form a gap between the filter paper and the inner surface of the side wall of the filter paper holder body 1.

[0024] like Figure 4 As shown, in another embodiment, the inner side of the support bar 3 is an arc-shaped bottom surface 3-3 with the same curvature as the inner surface of the side wall of the filter paper holder body 1, and the arc-shaped bottom surface 3-3 is flush with the inner surface of the side wall of the filter paper holder body 1 (the curved surface has a smooth transition). In other words, the cross section of the support bar 3 is a quasi-triangular shape, with the vertex protruding outward, and the inner bottom side is an arc-shaped shape with the same curvature as the inner surface of the side wall of the filter paper holder body 1.

[0025] For the filter paper holder matched with the larger triangular funnel, since the support bar 3 has a relatively thick size, as another embodiment, a row of auxiliary channels 3-4 are arranged vertically on the support bar 3 to further increase the pore area of ​​the filter paper holder through which the filtrate passes. Figure 5When in use, the inner end of the auxiliary channel 3-4 communicates with the inner space of the filter paper holder body 1, and the outer end communicates with the gap between the outer surface of the filter paper holder side wall and the inner wall of the triangular funnel. For a filter paper holder matched with a triangular funnel of ordinary specifications, since the support bar 3 is thin, if an auxiliary channel is opened on the support bar 3, the auxiliary channel will be difficult for the filtrate to pass smoothly due to the small pore size.

[0026] When in use, hold the handle 4 to place the filter paper holder body 1 into the matching triangular funnel, put the folded filter paper into the filter paper holder body 1, and insert the bottom end of the filter paper into the through hole 5. Add clean water to make the filter paper fit and fix with the inner surface (contact part) of the side wall of the filter paper holder body 1, and then start the filtration experiment.

Claims

1. A filter paper holder for use with a triangular funnel, comprising a filter paper holder body (1), the outer surface of the side wall of the filter paper holder body (1) being adapted to the shape of the inner side wall of the triangular funnel, the upper end being open and the lower end being provided with a through hole (5), characterized in that: A plurality of support bars (3) whose longitudinal center lines intersect with the center axis of the filter paper holder body (1) are evenly distributed on the side wall of the filter paper holder body (1); gaps serving as side wall channels (2) are provided between adjacent support bars (3); the support bars (3) have outer edges (3-1), and the outer edges (3-1) protrude outward from the side wall of the filter paper holder body (1), so as to ensure that there is a gap between the outer surface of the side wall of the filter paper holder and the inner wall of the triangular funnel when in use.

2. The filter paper holder used in conjunction with the triangular funnel as claimed in claim 1, characterized in that: The inner side of the support bar (3) is an arc-shaped bottom surface (3-3) having the same curvature as the inner surface of the side wall of the filter paper holder body (1); the arc-shaped bottom surface (3-3) is flush with the inner surface of the side wall of the filter paper holder body (1).

3. The filter paper holder used in conjunction with the triangular funnel as claimed in claim 2, characterized in that: A row of auxiliary channels (3-4) are arranged in an upper and lower manner on the support bar (3).

4. The filter paper holder for use with a triangular funnel as claimed in claim 1, characterized in that: The inner side of the support bar (3) has an inner edge (3-2), and the inner edge (3-2) protrudes inwards.

5. The filter paper holder used in conjunction with a triangular funnel according to any one of claims 1 to 4, characterized in that: A handle (4) is installed on the side wall of the filter paper holder body (1).

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