Improved structure of glass sand core vacuum filter

Abstract

The utility model discloses an improved structure of a glass sand core vacuum filter, and belongs to a chemical experiment appliance. The lower port of the filter sand core is hermetically connected with a triangular flask, and the filter cup is fixedly butted with the upper port of the filter sand core through a fixing clamp; a positioning sleeve (7) which is of an inverted-T-shaped structure is arranged at a bottle opening of the triangular flask (6), and an elastic clamping sleeve (4) is placed in the positioning sleeve (7); the elastic clamping sleeve is composed of a sleeve-shaped body (4-3), an inverted conical sleeve (4-1) and an elastic clamping seam (4-2), wherein the inverted conical sleeve (4-1) and the top end of the body are fixedly connected into a whole in a butt joint mode, and the elastic clamping seam (4-2) divides the middle section of the inverted conical sleeve and the middle section of the body (4-3) into at least two sections from top to bottom. The utility model not only can adapt to centrifuge tubes with different specifications, but also can adjust the mounting height of the centrifuge tube as required, can realize small-volume filter sample collection without any change on the structure of the original experimental device, and greatly expands the application range of the original experimental device.

Description

Technical Field

[0001] The utility model relates to a glass sand core vacuum filter, in particular to an improved structure based on the glass sand core vacuum filter, belonging to chemical experiment equipment. Background Art

[0002] As we all know, glass sand core filters are usually composed of a filter cup, a filter sand core, a triangular flask, and a fixing clamp. The specifications of the triangular flask are usually 250-5000 ml, and the bottom area is large, which has the following defects:

[0003] 1) The volume of the conical flask is too large, which easily causes solution loss when transferring small volume samples and is troublesome to operate;

[0004] 2) When filtering multiple different samples, in order to reduce the introduction of experimental errors and improve experimental precision and accuracy, the flask must be repeatedly washed and rinsed. The operation procedure is cumbersome, time-consuming and labor-intensive.

[0005] To overcome the aforementioned drawbacks of traditional glass sand core filters, a utility model patent has been published in China, titled "A Sand Core Filter Device (CN207042008U)." This patent builds upon the traditional structure by adding a liquid-receiving tube with an outer flange at the mouth of a triangular flask. The tube's positioning is achieved by leveraging the outer diameter of the flange, which is larger than the inner diameter of the flask's mouth. While this patent allows for direct collection of small-volume filter samples, it suffers from the following drawbacks:

[0006] 1) It is not possible to directly use a centrifuge tube to collect the filtered sample, and a special liquid collection tube with a flange is required;

[0007] 2) The installation height of the liquid holding pipe cannot be adjusted according to needs. Summary of the Invention

[0008] In view of the above-mentioned defects in the prior art, the utility model aims to provide an improved structure of a glass sand core vacuum filter which is simple and convenient to operate and can directly use a centrifuge tube to collect small volume filter samples.

[0009] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solution: it includes a filter sand core whose lower port is tightly connected to the triangular flask, and a filter cup fixedly docked with the upper port of the filter sand core by a fixing clip; a positioning sleeve with an inverted convex structure is placed at the bottle mouth of the triangular flask, and an elastic jacket is placed in the positioning sleeve; the elastic jacket is composed of a sleeve-shaped body, an inverted conical sleeve fixedly docked with the top end of the body as a whole, and an elastic gap that divides the inverted conical sleeve and the middle section of the body into at least two petals from top to bottom.

[0010] The inlet of the inverted cone sleeve has an inner cone surface.

[0011] The inner surface of the positioning sleeve is an inner conical surface matched with the inverted conical sleeve.

[0012] Compared with the prior art, the present invention has the following advantages due to the adoption of the above technical solution:

[0013] 1) By adding a positioning sleeve and elastic jacket without changing the structure of the traditional glass sand core filter, small-volume filter samples can be directly collected by simply clamping the centrifuge tube with the elastic jacket. This not only effectively avoids the loss of filter sample residue caused by first collecting the filter sample in a conical flask and then transferring it to the centrifuge tube, but also avoids the tedious operation of repeatedly washing the conical flask. This not only improves operational efficiency, but also effectively avoids cross-contamination of multiple samples due to incomplete washing, thereby improving experimental accuracy.

[0014] 2) By adding a positioning sleeve and an elastic jacket without changing the structure of the traditional glass sand core filter, it can not only adapt to centrifuge tubes of different specifications, but also adjust the installation height of the centrifuge tubes as needed.

[0015] 3) Small-volume filter sample collection can be achieved without making any changes to the structure of the original experimental device, greatly expanding the application range of the original experimental device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 This is a schematic diagram of the appearance structure of the elastic jacket of the utility model;

[0018] Figure 3 yes Figure 2 A-A sectional view in FIG;

[0019] Figure 4 yes Figure 2 Top view in ;

[0020] Figure 5 It is a structural schematic diagram of the positioning sleeve of the utility model.

[0021] In the figure: filter cup 1, fixing clamp 2, filter sand core 3, drainage tube 3-1, filter cover 3-2, exhaust nozzle 3-3, filter element 3-4, elastic jacket 4, inverted conical sleeve 4-1, elastic slit 4-2, body 4-3, inner conical surface 4-4, centrifuge tube 5, conical flask 6, positioning sleeve 7, flange 7-1, inner surface 7-2. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1As shown, a traditional glass sand core vacuum filter consists of a triangular flask 6, a filter sand core 3 hermetically sleeved at the flask's mouth via its lower port, and a filter cup 1 hermetically connected to the upper port of the filter sand core 3 via a fixing clamp 2. The filter sand core 3 comprises a funnel-shaped filter element 3-4, a filter cover 3-2 fixedly connected to the filter element back-to-back to form an "hourglass" structure, and an air extraction nozzle 3-3 fixed to the side of the filter cover and connected thereto. A drainage tube 3-1 located at the bottom of the filter element 3-4 extends downward into the filter cover 3-2, connecting the filter element 3-4 with the filter cover 3-2.

[0024] like Figures 1 to 5 As shown, the present invention, while maintaining the structure of the conventional glass sand core vacuum filter, achieves this by adding a positioning sleeve 7 to the mouth of a triangular flask 6 and placing an elastic jacket 4 within the positioning sleeve. The positioning sleeve 7 is a sleeve-like structure in the shape of an inverted convex letter "U." The diameter of the flange 7-1 located on the top surface of the positioning sleeve 7 is larger than the inner diameter of the mouth of the triangular flask 6, but smaller than the outer diameter. The positioning sleeve 7 is positioned at the mouth of the triangular flask 6 via the flange 7-1. Given that the thin wall thickness at the mouth of the triangular flask 6 makes it difficult to position the flange 7-1, the outer surface of the positioning sleeve 7 can also adopt an inverted conical surface with a larger top and a smaller bottom.

[0025] The elastic jacket 4 is composed of a sleeve-shaped body 4-3, an inverted cone sleeve 4-1 fixedly connected to the top of the body, and four elastic slits 4-2 that evenly divide the inverted cone sleeve and the middle section of the body 4-3 into four petals from top to bottom to form four clamping claws.

[0026] In order to facilitate the smooth insertion of the centrifuge tube 5 into the inner hole of the elastic jacket 4 (not shown in the figure), the inlet of the inverted conical sleeve 4-1 has an inner conical surface 4-4 that is larger at the top and smaller at the bottom.

[0027] In order to increase the contact area between the positioning sleeve 7 and the elastic jacket 4, thereby facilitating the elastic gap 4-2 to close and achieve a secure clamping of the centrifuge tube 5, the inner surface 7-2 of the positioning sleeve 7 adopts an inner conical surface structure that matches the inverted conical sleeve 4-1.

Claims

1. An improved structure of a glass sand core vacuum filter, comprising a filter sand core with a lower port sealedly connected to a triangular flask, and a filter cup fixedly docked with an upper port of the filter sand core via a fixing clip; characterized in that: A positioning sleeve (7) having an inverted convex structure is placed at the mouth of a triangular flask (6), and an elastic clamping sleeve (4) is placed in the positioning sleeve (7); the elastic clamping sleeve is composed of a sleeve-shaped body (4-3), an inverted conical sleeve (4-1) fixedly connected to the top end of the body as a whole, and an elastic clamping slit (4-2) that divides the inverted conical sleeve and the middle section of the body (4-3) into at least two lobes from top to bottom.

2. The improved structure of the glass sand core vacuum filter according to claim 1, characterized in that: The inverted cone sleeve (4-1) has an inner cone surface (4-4) at its inlet.

3. The improved structure of the glass sand core vacuum filter according to claim 1 or 2, characterized in that: The inner surface (7-2) of the positioning sleeve (7) is an inner conical surface that matches the inverted conical sleeve (4-1).

Images