A leak-proof structure for ultrafiltration centrifuge tubes

Abstract

This utility model relates to the field of centrifuge tube technology, and in particular to a leak-proof structure for an ultrafiltration centrifuge tube. It includes a collection tube and an ultrafiltration inner tube located inside the collection tube and tightly fitted to it. The outer top of the collection tube has an external thread, and a threaded cap is threaded onto the outer side of the external thread. In this utility model, by using a threaded post, threaded ring, connecting frame, inner retaining ring, elastic ring, tightening groove, and positioning assembly, after placing the collection tube into the centrifuge seat, the threaded ring is lightly screwed onto the outer side of the threaded post, and the fixing plate is pressed onto the outer side of the positioning block. Then, one hand holds the T-shaped frame, and the other hand rotates the connecting frame until the inner side of the elastic ring is tightly fitted to the outer side of the centrifuge seat. This completes the fixing of the collection tube and the threaded cap, and the device can then be used normally. This design can firmly fix the collection tube and the threaded cap to the centrifuge seat, preventing the threaded cap from detaching from the collection tube or the collection tube from detaching from the centrifuge seat due to device shaking.

Description

Technical Field

[0001] This utility model relates to the field of centrifuge tube technology, specifically to a leak-proof structure for an ultrafiltration centrifuge tube. Background Technology

[0002] Ultrafiltration centrifuge tubes are separation devices that combine centrifugal force and membrane filtration technology. They are widely used in modern scientific research and laboratory work. They mainly consist of three parts: a cap, a tube body, and a filter (the inner ultrafiltration tube). The filter is the core component, containing an ultrafiltration membrane with a specific molecular weight cutoff value. Its working principle is that when the ultrafiltration centrifuge tube rotates at high speed in a centrifuge, molecules or particles in the liquid are either trapped or permeate through the membrane according to their size under the action of centrifugal force. Specifically, substances with a molecular weight smaller than the membrane's cutoff value permeate into the outer tube, while substances with a molecular weight larger than the membrane's cutoff value are retained in the inner tube, thereby achieving sample concentration, separation, and purification.

[0003] Existing ultrafiltration centrifuge tubes are widely used, but existing devices may cause the tube cap to detach from the tube body due to shaking during centrifugation, resulting in material leakage, or even the tube body to detach from the device. Therefore, a leak-proof structure for ultrafiltration centrifuge tubes is proposed to address the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a leak-proof structure for ultrafiltration centrifuge tubes to solve the problem mentioned in the background art that existing devices may leak materials due to shaking.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A leak-proof structure for an ultrafiltration centrifuge tube includes a collection tube and an ultrafiltration inner tube disposed inside the collection tube and tightly fitted to the inner side of the collection tube. The outer top of the collection tube has an external thread, and a threaded cap is threadedly connected to the outer side of the external thread. A sealing gasket is fixedly connected to the inner top of the threaded cap, and a limiting component is installed at the bottom of the sealing gasket. A vertically arranged threaded post is fixedly connected to the center of the top of the threaded cap, and a threaded ring is threadedly connected to the outer side of the threaded post. A symmetrically arranged connecting frame is fixedly connected to the outer side of the threaded ring, and an inner retaining ring is fixedly connected to the bottom of the connecting frame. An elastic ring is provided inside the inner retaining ring, and multiple tightening grooves penetrating the elastic ring are opened on the outer side of the elastic ring. A positioning component is installed at the top of the threaded post.

[0007] Preferably, the bottom end of the sealing gasket is tightly fitted to the top end of the collecting tube, the inner retaining ring is disposed on the outside of the collecting tube, the elastic ring is located on the outside of the collecting tube and fixedly connected to the bottom end of the threaded cap, and the external thread and the threaded post have the same thread direction.

[0008] Preferably, the elastic ring has a design that is narrower at the top and wider at the bottom, and the inner side of the inner ring is in close contact with the outer side of the elastic ring.

[0009] Preferably, the limiting component includes a limiting post fixedly connected to the bottom end of the sealing gasket, and a limiting ring is fixedly connected to the bottom end of the limiting post.

[0010] Preferably, multiple limiting posts are provided, and the limiting posts are distributed along the polar axis at the bottom end of the sealing gasket. The outer side of the limiting ring is attached to the inner side of the collecting tube, and the bottom end of the limiting ring is attached to the top end of the ultrafiltration inner tube.

[0011] Preferably, the positioning component includes a positioning block fixedly connected to the top of the threaded column, a fixing plate is provided on the outside of the positioning block, a positioning groove is provided at the bottom of the fixing plate, and a T-shaped frame is fixedly connected to the top of the fixing plate.

[0012] Preferably, the maximum outer diameter of the positioning block is smaller than the outer diameter of the threaded column, and the positioning block is inserted into the inner side of the positioning groove and engaged with the positioning groove.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. In this utility model, by setting a threaded column, a threaded ring, a connecting frame, an inner closing ring, an elastic ring, a tightening groove, and a positioning component, after the collection tube is placed in the centrifuge seat, the threaded ring is lightly screwed on the outside of the threaded column, the fixing plate is pressed on the outside of the positioning block, and then the T-shaped frame is fixed with one hand, while the connecting frame is rotated with the other hand until the inner side of the elastic ring is tightly fitted with the outer side of the centrifuge seat, thus completing the fixing of the collection tube and the threaded cap, and the device can be used normally. This design can firmly fix the collection tube and the threaded cap on the centrifuge seat, avoiding the threaded cap from falling off the collection tube or the collection tube from falling off the centrifuge seat due to device shaking;

[0015] 2. In this utility model, by setting a limiting component, a limiting post, and a limiting ring, when the threaded cap is screwed onto the collection tube, the bottom end of the sealing gasket is tightly fitted with the top end of the collection tube. At this time, the limiting ring at the bottom end of the limiting post presses the ultrafiltration inner ring, causing it to move continuously downward. Since the inner side of the collection tube is usually designed to be wider at the top and narrower at the bottom, the ultrafiltration inner tube can move downward and fit tightly with the inner side of the collection tube. This design can press the ultrafiltration inner tube tightly, preventing the material in the ultrafiltration inner tube from directly entering the bottom of the collection tube through the gap between the ultrafiltration inner tube and the collection tube. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the overall disassembly structure of this utility model;

[0018] Figure 3This is a schematic diagram of the bottom structure of the fixing plate of this utility model;

[0019] Figure 4 This is a schematic diagram of the installation structure of the ultrafiltration inner tube of this utility model;

[0020] Figure 5 This is a schematic diagram of the cross-sectional structure of the threaded cap of this utility model.

[0021] In the diagram: 1. Collection tube; 2. Ultrafiltration inner tube; 3. External thread; 4. Threaded cap; 5. Sealing gasket; 6. Limiting assembly; 61. Limiting post; 62. Limiting ring; 7. Threaded post; 8. Threaded ring; 9. Connecting frame; 10. Inner retraction ring; 11. Elastic ring; 12. Tightening groove; 13. Positioning assembly; 131. Positioning block; 132. Fixing plate; 133. Positioning groove; 134. T-shaped frame. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0024] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0025] Please see Figure 1-5 This utility model provides a technical solution:

[0026] A leak-proof structure for an ultrafiltration centrifuge tube includes a collection tube 1 and an inner ultrafiltration tube 2 located inside the collection tube 1 and tightly fitted to it. The outer top of the collection tube 1 has an external thread 3, and a threaded cap 4 is threadedly connected to the outer side of the external thread 3. A sealing gasket 5 is fixedly connected to the inner top of the threaded cap 4, and a limit component 6 is installed at the bottom of the sealing gasket 5. A vertically arranged threaded post 7 is fixedly connected to the center of the top of the threaded cap 4, and a threaded ring 8 is threadedly connected to the outer side of the threaded post 7. Symmetrically arranged connecting frames 9 are fixedly connected to the outer side of the threaded ring 8. An inner retaining ring 10 is fixedly connected to the bottom end. An elastic ring 11 is provided on the inner side of the inner retaining ring 10. Multiple tightening grooves 12 penetrating the elastic ring 11 are provided on the outer side of the elastic ring 11. A positioning component 13 is installed on the top of the threaded column 7. The bottom end of the sealing gasket 5 is tightly fitted to the top end of the collecting tube 1. The inner retaining ring 10 is located on the outside of the collecting tube 1. The elastic ring 11 is located on the outside of the collecting tube 1 and is fixedly connected to the bottom end of the threaded cap 4. The external thread 3 and the threaded column 7 have the same thread direction. The elastic ring 11 has a design that is narrow at the top and wide at the bottom. The inner side of the inner retaining ring 10 is tightly fitted to the outer side of the elastic ring 11. The positioning component 13 includes a positioning block 131 fixedly connected to the top of the threaded post 7. A fixing plate 132 is provided on the outer side of the positioning block 131. A positioning groove 133 is opened at the bottom end of the fixing plate 132. A T-shaped bracket 134 is fixedly connected to the top of the fixing plate 132. The maximum outer diameter of the positioning block 131 is smaller than the outer diameter of the threaded post 7. The positioning block 131 is inserted into the inner side of the positioning groove 133 and engages with it. The positioning is achieved through the threaded post 7, threaded ring 8, connecting bracket 9, inner retracting ring 10, elastic ring 11, tightening groove 12, and fixing plate 134. After placing the collection tube 1 into the centrifuge seat, gently screw the threaded ring 8 onto the outside of the threaded post 7, press the fixing plate 132 onto the outside of the positioning block 131, then hold the T-shaped frame 134 with one hand and rotate the connecting frame 9 with the other hand until the inner side of the elastic ring 11 is tightly fitted with the outer side of the centrifuge seat. This completes the fixing of the collection tube 1 and the threaded cover 4, and the device can then be used normally. This design can fix the collection tube 1 and the threaded cover 4 on the centrifuge seat and prevent the threaded cover 4 from falling off the collection tube 1 or the collection tube 1 from falling off the centrifuge seat due to device shaking.

[0027] The limiting component 6 includes a limiting post 61 fixedly connected to the bottom end of the sealing gasket 5. A limiting ring 62 is fixedly connected to the bottom end of the limiting post 61. Multiple limiting posts 61 are provided, and the limiting posts 61 are distributed along the polar axis at the bottom end of the sealing gasket 5. The outer side of the limiting ring 62 is in contact with the inner side of the collecting tube 1, and the bottom end of the limiting ring 62 is in contact with the top end of the ultrafiltration inner tube 2. Through the limiting component 6, the limiting post 61 and the limiting ring 62, when the threaded cap 4 is screwed onto the collecting tube 1, the bottom end of the sealing gasket 5 is tightly in contact with the top end of the collecting tube 1. At this time, the limiting ring 62 at the bottom end of the limiting post 61 presses the ultrafiltration inner ring, causing it to move continuously downward. Since the inner side of the collecting tube 1 is usually designed to be wider at the top and narrower at the bottom, the ultrafiltration inner tube 2 can move downward and fit tightly with the inner side of the collecting tube 1. This design can press the ultrafiltration inner tube 2 tightly and prevent the material in the ultrafiltration inner tube 2 from directly entering the bottom of the collecting tube 1 through the gap between the ultrafiltration inner tube 2 and the collecting tube 1.

[0028] Workflow: Before using the device, first place the ultrafiltration inner tube 2 inside the collection tube 1. Pour the material to be filtered into the inner tube 2. At this time, the outer ring of the ultrafiltration inner tube 2 may not be in contact with the inner side of the collection tube 1. Screw the threaded cap 4 onto the outer side of the external thread 3 on the collection tube 1, so that the bottom end of the sealing gasket 5 is in close contact with the top end of the collection tube 1. Also, press the limiting ring 62 at the bottom of the limiting post 61 against the ultrafiltration inner tube 2, causing it to move downwards. Since the inner side of the collection tube 1 is usually wider at the top and narrower at the bottom, the ultrafiltration inner tube 2 can be moved downwards to fit tightly against the inner side of the collection tube 1. The design of the limiting component 6 can press the ultrafiltration inner tube 2, preventing the material in the ultrafiltration inner tube 2 from directly entering the bottom of the collection tube 1 through the gap between the ultrafiltration inner tube 2 and the collection tube 1. Next, place the collection tube 1 into one of the centrifuge seats of the centrifuge, so that... The elastic ring 11 is fitted onto the outside of the centrifuge seat. The threaded ring 8 on the connecting frame 9 is gently screwed onto the outside of the threaded post 7. Then, the fixing plate 132 at the bottom of the T-shaped frame 134 is pressed onto the outside of the positioning block 131, so that the positioning block 131 is inserted into the inside of the positioning groove 133 and fits tightly with the positioning groove 133. Then, one hand holds the T-shaped frame 134 and the other hand rotates the connecting frame 9, so that the inner ring 10 rotates and moves downward. At this time, due to the design of the tightening groove 12, the elastic ring 11 deforms as a whole until the inner side of the elastic ring 11 fits tightly with the outside of the centrifuge seat. The collection tube 1 and the threaded cover 4 are then fixed, and the device can be used normally. The design of the positioning component 13 and its connecting components can fix the collection tube 1 and the threaded cover 4 on the centrifuge seat, preventing the threaded cover 4 from falling off the collection tube 1 or the collection tube 1 from falling off the centrifuge seat due to the shaking of the device.

[0029] Contents not described in detail in this specification are existing technologies known to those skilled in the art. Standard parts used in this invention can all be purchased commercially, and irregularly shaped parts can be custom-made according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are already mature technologies. The machinery, parts, and equipment all use conventional models from the prior art, and the circuit connections also employ conventional connection methods from the prior art, which will not be detailed here.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A leak-proof structure for an ultrafiltration centrifuge tube, comprising a collection tube (1) and an ultrafiltration inner tube (2) disposed inside the collection tube (1) and tightly fitted to the inner side of the collection tube (1), characterized in that: The outer top of the collecting tube (1) is provided with an external thread (3), and the outer thread (3) is threadedly connected to a threaded cap (4). The inner top of the threaded cap (4) is fixedly connected to a sealing gasket (5). The bottom of the sealing gasket (5) is equipped with a limiting component (6). The center of the top of the threaded cap (4) is fixedly connected to a vertically arranged threaded column (7). The outer side of the threaded column (7) is threadedly connected to a threaded ring (8). The outer side of the threaded ring (8) is fixedly connected to a symmetrically arranged connecting frame (9). The bottom of the connecting frame (9) is fixedly connected to an inner closing ring (10). The inner side of the inner closing ring (10) is provided with an elastic ring (11). The outer side of the elastic ring (11) is provided with multiple tightening grooves (12) that penetrate the elastic ring (11). The top of the threaded column (7) is equipped with a positioning component (13).

2. The leak-proof structure of an ultrafiltration centrifuge tube according to claim 1, characterized in that: The bottom end of the sealing gasket (5) is tightly fitted to the top end of the collecting tube (1), the inner ring (10) is located on the outside of the collecting tube (1), the elastic ring (11) is located on the outside of the collecting tube (1) and is fixedly connected to the bottom end of the threaded cap (4), and the external thread (3) and the threaded column (7) have the same thread direction.

3. The leak-proof structure of an ultrafiltration centrifuge tube according to claim 2, characterized in that: The elastic ring (11) is designed to be narrow at the top and wide at the bottom, and the inner side of the inner ring (10) is closely fitted to the outer side of the elastic ring (11).

4. The leak-proof structure of an ultrafiltration centrifuge tube according to claim 3, characterized in that: The limiting component (6) includes a limiting post (61) fixedly connected to the bottom end of the sealing gasket (5), and a limiting ring (62) is fixedly connected to the bottom end of the limiting post (61).

5. The leak-proof structure of an ultrafiltration centrifuge tube according to claim 4, characterized in that: Multiple limiting posts (61) are provided. The limiting posts (61) are distributed in a polar axis at the bottom end of the sealing gasket (5). The outer side of the limiting ring (62) is attached to the inner side of the collecting tube (1), and the bottom end of the limiting ring (62) is attached to the top end of the ultrafiltration inner tube (2).

6. The leak-proof structure of an ultrafiltration centrifuge tube according to claim 1, characterized in that: The positioning component (13) includes a positioning block (131) fixedly connected to the top of the threaded column (7). A fixing plate (132) is provided on the outside of the positioning block (131). A positioning groove (133) is provided at the bottom of the fixing plate (132). A T-shaped frame (134) is fixedly connected to the top of the fixing plate (132).

7. The leak-proof structure of an ultrafiltration centrifuge tube according to claim 6, characterized in that: The maximum outer diameter of the positioning block (131) is smaller than the outer diameter of the threaded column (7). The positioning block (131) is inserted into the inner side of the positioning groove (133) and engaged with the positioning groove (133).

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