Fritted funnel with screw-on seal

Abstract

The utility model relates to the field of solid -liquid separation especially relates to a screw type sealing structure's burette, including liquid outlet, feed cylinder and locking ring, set up conical material export on the bottom hopper wall of liquid outlet, the thickening of top hopper wall forms the bearing platform, the outside of bearing platform is provided with thread belt, the top of feed cylinder is material inlet, and the bottom is provided with eaves, the inner thread of locking ring is provided with the meshing of thread belt, the upper end of locking ring is provided with eaves, when locking ring is screwed with thread belt, eaves pushes and reaches eaves, makes filter cloth to be pressed in eaves and bearing platform between. Through locking ring, adopt the thread type compression structure, utilize the linkage of eaves, support block and eaves, press filter cloth and bottom sealing washer, upper sealing ring simultaneously on bearing platform, formed a multiple, reliable radial and axial sealing system. This structure effectively solved the drawback that traditional equipment relied on plasticine temporary sealing when using filter cloth, and the sealing effect is better.

Description

Technical Field

[0001] This utility model relates to the field of solid-liquid separation, and in particular to a Buchner funnel with a screw-tight sealing structure. Background Technology

[0002] Buchner funnels are indispensable solid-liquid separation devices in chemical, biological, and pharmaceutical laboratories. Traditionally, they are typically molded as a single piece of ceramic or glass, comprising a funnel body, a neck, and a porous sieve plate to support filter paper. While this classic design is widely used, it has at least two inherent drawbacks in practical applications:

[0003] First, traditional Buchner funnels have poor adaptability to different filter media. Originally designed for flat filter paper, they suffer from poor filtration when experiments require flexible media such as fiber filter cloth. Due to the lack of an effective peripheral sealing structure, the edges of the filter cloth easily warp under negative pressure, leading to solid leakage and affecting filtration efficiency. The current common solution is to manually seal the funnel using temporary materials like putty. However, this method is not only unreliable and cumbersome, but it can also introduce external contaminants, making it unsuitable for experiments requiring high cleanliness.

[0004] Secondly, the traditional Buchner funnel has low unloading efficiency. Its one-piece structure and non-straight inner wall make it easy for the filter cake formed after the experiment to adhere to the side wall of the funnel and the edge of the sieve plate. During unloading, it is necessary to use tools such as scrapers to scrape it repeatedly, which is not only inconvenient to operate and easy to damage the integrity of the filter cake, but also makes it difficult to transfer and observe the filter cake without damage. It also increases the difficulty of cleaning the equipment. Utility Model Content

[0005] Technical objective: In order to overcome the shortcomings of the existing technology, this utility model provides a Buchner funnel with a screw-tight sealing structure to achieve reliable sealing and convenient unloading.

[0006] Technical Solution: To achieve the above objectives, this utility model discloses a Buchner funnel with a screw-on sealing structure, comprising a liquid outlet hopper, a feed cylinder, and a locking ring. The bottom wall of the liquid outlet hopper is provided with a conical material outlet, and the top wall is thickened to form a support platform. A threaded band is provided on the outside of the support platform. The top of the feed cylinder is the material inlet, and the bottom is provided with an outer edge. The locking ring is provided with an internal thread that engages with the threaded band, and the upper end of the locking ring is provided with an inner edge. When the locking ring is screwed on with the threaded band, the inner edge pushes against the outer edge, pressing the filter cloth between the outer edge and the support platform.

[0007] Furthermore, a support block is provided between the inner eaves and the outer eaves, the bottom surface of the support block is in contact with the top surface of the outer eaves, and a step surface that is in contact with the bottom surface of the inner eaves is also provided on the support block.

[0008] Furthermore, the support platform is provided with a groove, and the bottom sealing gasket is placed inside the groove.

[0009] Furthermore, a sealing ring is provided between the outer eaves and the filter cloth.

[0010] Furthermore, a support step is provided at the upper end of the liquid outlet hopper, and a support plate is provided on the support step.

[0011] Furthermore, the liquid outlet hopper, feed cylinder, and locking ring are made of stainless steel.

[0012] Compared with the prior art, the present invention has at least the following beneficial effects:

[0013] 1. Through the locking ring and threaded compression structure, the filter cloth, bottom sealing gasket, and upper sealing ring are simultaneously pressed onto the bearing platform by the linkage of the inner and outer edges, forming a multi-layered and reliable radial and axial sealing system. This structure effectively solves the drawback of traditional equipment that relies on temporary sealing with putty when using filter cloth, resulting in better sealing performance, especially suitable for various flexible filter media.

[0014] 2. This device adopts a split design. After filtration, simply loosen the locking ring to separate the feed cylinder from the outlet hopper, allowing the filter cake to be completely exposed or retained in the feed cylinder. This completely avoids the problem of filter cake adhering to the side walls and bottom of traditional integrated funnels, enabling rapid and non-destructive removal of the filter cake and facilitating subsequent observation, transfer, and cleaning operations.

[0015] 3. The modular mechanical clamping structure of this utility model is stable and reliable. Compared with fragile ceramic or glass products, the components of this invention can be made of stainless steel or other metals or high-performance engineering plastics, which not only have high mechanical strength and good durability, but also broaden the applicability of the equipment in corrosive or high-intensity application scenarios. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the overall structure of the funnel in an embodiment of this utility model;

[0017] Figure 2 for Figure 1 Enlarged view of the structure of part A in the middle.

[0018] In the diagram, 1 is the liquid outlet hopper; 2 is the bottom sealing gasket; 3 is the support plate; 4 is the filter cloth; 5 is the sealing ring; 6 is the locking ring; 7 is the support block; 8 is the feed cylinder; 9 is the bearing platform; 10 is the threaded belt; 11 is the outer eaves; 12 is the inner eaves; 13 is the stepped surface; and 14 is the supporting step. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1 To be continued Figure 2 The principles and features of this utility model are described, and the examples given are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0020] A Buchner funnel with a screw-on sealing structure includes an outlet hopper 1, a feed cylinder 8, and a locking ring 6. The outlet hopper 1 and the feed cylinder 8 have interconnected internal spaces, and after they are aligned, they are locked together by the locking ring 6. The outlet hopper 1, the feed cylinder 8, and the locking ring 6 are made of stainless steel, or of non-metallic materials commonly used in Buchner funnels in the prior art.

[0021] A conical material outlet is provided on the bottom wall of the liquid outlet hopper 1, and the top wall is thickened to form a support platform 9. Specifically, the support platform 9 extends in a direction away from the axis. A threaded band 10 is provided on the outside of the support platform 9, and a support step 14 is also provided on the inner wall of the upper port of the liquid outlet hopper 1. The support step 14 is used to place the support plate 3, and the support plate 3 can be a porous support plate in the prior art.

[0022] The top of the feed cylinder 8 is the material inlet, and the bottom is provided with an outer eave 11. That is, the bottom wall of the feed cylinder 8 extends in a direction away from the axis to form an outer eave 11, and the lower end of the outer eave 11 forms a plane that fits against the bearing platform 9.

[0023] The locking ring 6 is a ring-shaped structure. Its inner wall surface is provided with an internal thread that engages with the threaded band 10, and its outer wall surface can be provided with a pattern to increase friction when tightening and loosening. The upper end of the locking ring 6 is provided with an inner eave 12, that is, the upper end of the locking ring 6 extends in the direction towards the axis to form an inner eave 12, and the lower end of the inner eave 12 forms a plane that fits against the upper end of the outer eave 11.

[0024] When the locking ring 6 is tightened with the threaded belt 10, the inner eaves 12 push against the outer eaves 11, thereby pressing the outer eaves 11 against the support platform 9. With this design, the filter cloth 4 can be pressed between the outer eaves 11 and the support platform 9.

[0025] To achieve a better sealing effect, a sealing ring 5 can be provided between the outer edge 11 and the filter cloth 4. In addition, a groove is provided on the support platform 9, and the bottom sealing gasket 2 is placed in the groove.

[0026] To ensure good adjustment of the locking ring 6 during tightening, a support block 7 is provided between the inner eaves 12 and the outer eaves 11. The bottom surface of the support block 7 is in contact with the top surface of the outer eaves 11, and a stepped surface 13 is provided on the support block 7 to be in contact with the bottom surface of the inner eaves 12. The height of the threaded band 10 is greater than the height of the bearing platform 9. Thus, the threaded band 10 and the bearing platform 9 enclose a bearing space in which the filter cloth 4, the sealing ring 5, and the outer eaves 11 can all be accommodated.

[0027] When using this device, first place a suitable filter cloth 4 on the support platform 9, then place the sealing ring 5, feed cylinder 8, and support block 7 in sequence. Finally, tighten the locking ring 6 and threaded band 10. During the tightening process, the inner edge 12 pushes the support block 7, and the support block 7 pushes the outer edge 11, causing the feed cylinder 8 to move downwards, squeezing and sealing the bottom sealing gasket 2 below the filter cloth 4 and the sealing ring 5 above the filter cloth 4, thus completing the assembly. Using a round thread as the locking thread ensures better wear resistance, durability, self-cleaning ability, and anti-fouling properties while maintaining tightness. The smooth arc transition of the round thread makes it difficult for impurities such as mud, dust, and iron filings to get stuck at the bottom of the thread. Even if impurities are present, they are more easily carried out or crushed, further ensuring the good operating performance of the equipment.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A Bϋchner funnel of the screw-on type, characterized in that The device includes a liquid outlet hopper (1), a feed cylinder (8), and a locking ring (6). The liquid outlet hopper (1) has a conical material outlet on its bottom wall and a thickened top wall to form a support platform (9). The support platform (9) has a threaded band (10) on its outside. The feed cylinder (8) has a material inlet at its top and an outer eave (11) at its bottom. The locking ring (6) has an internal thread that meshes with the threaded band (10). The upper end of the locking ring (6) has an inner eave (12). When the locking ring (6) is tightened with the threaded band (10), the inner eave (12) pushes against the outer eave (11), pressing the filter cloth (4) between the outer eave (11) and the support platform (9).

2. The Buchner funnel with a screw-on sealing structure according to claim 1, characterized in that, A support block (7) is also provided between the inner eaves (12) and the outer eaves (11). The bottom surface of the support block (7) is in contact with the top surface of the outer eaves (11). A step surface (13) that is in contact with the bottom surface of the inner eaves (12) is also provided on the support block (7).

3. The Buchner funnel with a screw-on sealing structure according to claim 1 or 2, characterized in that, The bearing platform (9) is provided with a groove, and the bottom sealing gasket (2) is placed in the groove.

4. The Buchner funnel with a screw-on sealing structure according to claim 1 or 2, characterized in that, A sealing ring (5) is provided between the outer eaves (11) and the filter cloth (4).

5. The Buchner funnel with a screw-on sealing structure according to claim 1 or 2, characterized in that, A support step (14) is also provided at the upper port of the liquid outlet hopper (1), and a support plate (3) is provided on the support step (14).

6. The Buchner funnel with a screw-on sealing structure according to claim 1 or 2, characterized in that, The liquid outlet hopper (1), feed cylinder (8) and locking ring (6) are made of stainless steel.

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