Sealing assembly between column head and column tube and chromatographic column

Abstract

The sealing assembly comprises an elastic supporting piece and a scraper ring arranged on the circumferential side of the column head, an annular groove used for containing the elastic supporting piece is formed in the scraper ring, and one side of the scraper ring extends to form an annular sealing part. And the annular sealing part is clamped between the side wall of the end part of the column head and the side wall of the column pipe to form a sealing structure. The invention further discloses a chromatographic column which comprises a column head, a column tube on the periphery of the column head and the sealing assembly. When the scraper ring is subjected to upward pressure, the inner side of the scraper ring is tightly attached to the outer side of the column head, and the outer side of the scraper ring is tightly attached to the inner wall of the column tube, so that a good sealing effect is achieved, leakage is prevented, and packing on the inner wall of the column tube can still be scraped clean when packing particles are large; the scraper ring is provided with an annular sealing part which extends downwards to the outer side of the lower part of the column head, and the outer side of the annular sealing part is contacted with the inner wall of the column tube, so that cleaning dead angles between the outer side of the lower part of the column head and the inner wall of the column tube can be eliminated.

Description

Technical Field

[0001] The invention relates to the field of separation equipment, in particular to a sealing component between a column head and a column tube and a chromatographic column. Background Art

[0002] The column head of the chromatographic column mainly includes a back plate, a distributor and a screen assembly, which are connected into a whole by threaded fasteners. Under the action of external force, the whole moves up and down in the column tube. At present, the sealing between the column head and the column tube is mainly achieved by installing an O-ring. The structure is relatively simple, the cost is low, and the disassembly and maintenance are convenient. However, the sealing performance of the O-ring sealing structure does not meet the requirements under high-pressure conditions, and the pressure loss is large. At the same time, when the filler particles are too large, the filler on the inner wall of the column tube cannot be scraped clean. In addition, due to the small gap between the outer side of the lower part of the screen assembly and the inner wall of the column tube, a cleaning dead angle will be generated. In addition, there is a surface contact between the O-ring and the inner wall of the column tube, and there is a risk of scratching the inner wall of the column tube, and the cost of the column tube is as high as tens of thousands to hundreds of thousands of yuan. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a sealing component with a simple structure and good sealing performance, which can still scrape the inner wall of the column tube clean when the filler particles are large, and is conducive to avoiding the formation of a cleaning dead corner between the column head and the column tube.

[0004] The present invention further provides a chromatographic column comprising the sealing component between the column head and the column tube.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A sealing assembly between a column cap and a column tube comprises an elastic support member and a scraper ring arranged on the periphery of the column cap, wherein the scraper ring is provided with an annular groove for accommodating the elastic support member, and one side of the scraper ring extends to form an annular sealing portion, wherein the annular sealing portion is clamped between the side wall of the column cap end and the side wall of the column tube to form a sealing structure.

[0007] As a further improvement of the above technical solution: the cross section of the annular groove is U-shaped and the opening is arranged downward, and the annular sealing portion is located at the lower side of the scraper ring.

[0008] As a further improvement of the above technical solution: a radial flange is provided at the lower part of the column head, the scraper ring is arranged above the radial flange, and the annular sealing part is located outside the radial flange.

[0009] As a further improvement of the above technical solution: the inner side of the scraper ring is in contact and sealed with the side wall of the column head, and the outer side is in contact and sealed with the side wall of the column tube.

[0010] As a further improvement of the above technical solution: sawtooth-shaped protrusions are provided on the outer sides of the scraper ring and the annular sealing portion.

[0011] As a further improvement of the above technical solution: the sawtooth protrusion is also provided on the inner side of the scraper ring.

[0012] As a further improvement of the above technical solution: a sealing ring is also sleeved on the column head, and the sealing ring is arranged above the scraper ring. The inner side of the sealing ring is in contact and seal with the outer side of the column head, and the outer side is in contact and seal with the inner wall of the column tube.

[0013] A chromatographic column comprises a column head and a column tube arranged on the periphery of the column head, and also comprises a sealing component between the column head and the column tube.

[0014] As a further improvement of the above technical solution: the column head includes a back plate, a distributor and a screen assembly arranged in sequence from top to bottom, the back plate, the distributor and the screen assembly are connected by threaded fasteners, the scraper ring is arranged on the screen assembly, and the sealing ring is arranged on the distributor.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] The sealing assembly between the column cap and the column tube disclosed in the present invention has an annular groove on the scraper ring and an elastic support member in the annular groove. When the scraper ring is squeezed, the inner side of the scraper ring fits tightly with the side wall of the column cap, and the outer side of the scraper ring fits tightly with the side wall of the column tube, thereby achieving a good sealing effect and preventing leakage. At the same time, when the filler particles are large, the filler on the inner wall of the column tube can still be scraped clean; one side of the scraper ring extends to form an annular sealing portion, and a sealing structure is formed between the side wall of the column cap end and the side wall of the column tube, thereby eliminating the cleaning dead angle between the side wall of the column cap end and the side wall of the column tube. The overall structure is simple and the sealing performance is good.

[0017] The chromatographic column disclosed in this embodiment includes the above-mentioned sealing assembly between the column head and the column tube, and thus also has the above-mentioned advantages.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional structural schematic diagram of the present invention.

[0020] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0021] The symbols in the figure represent:

[0022] 1. Column head; 11. Back plate; 12. Distributor; 13. Screen assembly; 14. Threaded fastener; 15. Radial flange; 2. Scraper ring; 21. Annular sealing portion; 22. Serrated protrusion; 23. Annular groove; 24. Elastic support member; 3. Column tube; 4. Sealing ring. DETAILED DESCRIPTION

[0023] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first", "first", "second", "third", "fourth", "fif ...

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "assemble", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Embodiment 1

[0028] Figure 1 to Figure 2An embodiment of a sealing assembly between a column cap and a column tube of the present invention is shown. The sealing assembly between the column cap and the column tube of the present embodiment comprises a scraper ring 2 sleeved on the column cap 1 (i.e., the scraper ring 2 is arranged on the side of the column cap 1). Preferably, the scraper ring 2 is in contact and sealed with the side wall of the column cap 1 on the inner side and in contact and sealed with the side wall (inner wall) of the column tube 3 on the outer side. The scraper ring 2 is provided with an annular groove 23 with a U-shaped cross-section and an opening facing downward and an annular sealing portion 21 extending downward to the outer side of the lower end of the column cap 1. An elastic support member 24 is accommodated in the annular groove 23. The annular sealing portion 21 is clamped between the lower end of the column cap 1 and the inner wall of the column tube 3, thereby forming a sealing structure between the side wall of the lower end of the column cap 1 and the inner wall of the column tube 3.

[0029] In the sealing assembly between the column cap and the column tube of the present embodiment, the scraper ring 2 is provided with an annular groove 23 with an opening facing downward, and an elastic support member 24 is provided in the annular groove 23. When the scraper ring 2 is subjected to upward pressure, the inner side of the scraper ring 2 is tightly fitted with the outer side of the column cap 1, and the outer side of the scraper ring 2 is tightly fitted with the inner wall of the column tube 3, thereby achieving a good sealing effect to prevent leakage. At the same time, when the filler particles are large, the filler on the inner wall of the column tube 3 can still be scraped clean; the scraper ring 2 is provided with an annular sealing portion 21 extending downward to the outer side of the lower part of the column cap 1, and the outer side of the annular sealing portion 21 contacts the inner wall of the column tube 3, thereby eliminating the cleaning dead angle between the outer side of the lower part of the column cap 1 and the inner wall of the column tube 3. The overall structure is simple and the sealing performance is good.

[0030] See Figure 2 Furthermore, in this embodiment, the outer sides of the scraper ring 2 and the annular sealing portion 21 are provided with serrated protrusions 22. Since the outer sides of the scraper ring 2 and the annular sealing portion 21 are both provided with serrated protrusions 22, the serrated protrusions 22 are in line contact with the inner wall of the column tube 3, which can greatly reduce or even eliminate the risk of scratching the inner wall of the column tube 3 compared to surface contact, and can form a multi-pass sealing structure to further improve the sealing performance, and the structure is simple and effective.

[0031] As a preferred embodiment, a sawtooth protrusion 22 is also provided on the inner side of the scraper ring 2. The sawtooth protrusion 22 can form multiple seals between the inner side of the scraper ring 2 and the outer side of the column head 1, which is conducive to improving the sealing effect.

[0032] Furthermore, in this embodiment, a radial flange 15 is provided at the lower part of the column head 1, the scraper ring 2 is provided above the radial flange 15, and the annular sealing portion 21 is located outside the radial flange 15. The radial flange 15 can provide positioning and support for the scraper ring 2, and the annular sealing portion 21 is used to eliminate the cleaning dead angle between the radial flange 15 and the inner wall of the column tube 3.

[0033] Furthermore, in this embodiment, a sealing ring 4 is also sleeved on the column head 1, and the sealing ring 4 is arranged above the scraper ring 2. The inner side of the sealing ring 4 contacts and seals with the outer side of the column head 1, and the outer side contacts and seals with the inner wall of the column tube 3. The sealing ring 4 cooperates with the scraper ring 2, so that a secondary sealing structure is formed between the column head 1 and the column tube 3. Specifically, the scraper ring 2 is arranged on the outer periphery of the screen assembly 13, and the sealing ring 4 is arranged on the distributor 12. The sealing ring 4 can be, for example, an O-ring. The O-ring is used on the upper side and the scraper ring 2 is used on the lower side, which combines the functionality of the two (sealing function and scraping function, etc.), and is easy to disassemble and maintain, saving the time required for replacement.

[0034] Embodiment 2

[0035] The chromatographic column of this embodiment includes a column head 1 and a column tube 3 arranged on the outer periphery of the column head 1, and also includes the sealing component between the column head and the column tube.

[0036] Specifically, in this embodiment, the column head 1 includes a back plate 11, a distributor 12 and a screen assembly 13 arranged in sequence from top to bottom, the back plate 11, the distributor 12 and the screen assembly 13 are connected by threaded fasteners 14, the scraper ring 2 is sleeved on the screen assembly 13, and the sealing ring 4 is sleeved on the distributor 12.

[0037] The chromatographic column of this embodiment includes the above-mentioned sealing component between the column head and the column tube, and thus also has the above-mentioned advantages.

[0038] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A sealing assembly between a column head and a column tube, characterized in that: The invention comprises an elastic support member (24) and a scraper ring (2) arranged on the periphery of a column head (1); the scraper ring (2) is provided with an annular groove (23) for accommodating the elastic support member (24); and one side of the scraper ring (2) extends to form an annular sealing portion (21); the annular sealing portion (21) is sandwiched between the side wall of the end of the column head (1) and the side wall of the column tube (3) to form a sealing structure.

2. The sealing assembly between the column head and the column tube according to claim 1, characterized in that: The cross section of the annular groove (23) is U-shaped and its opening is arranged downward, and the annular sealing portion (21) is located at the lower side of the scraper ring (2).

3. The sealing assembly between the column head and the column tube according to claim 2, characterized in that: A radial flange (15) is provided at the lower part of the column head (1), the scraper ring (2) is arranged above the radial flange (15), and the annular sealing portion (21) is located outside the radial flange (15).

4. The sealing assembly between the column head and the column tube according to claim 1, characterized in that: The scraper ring (2) is in sealed contact with the side wall of the column head (1) on the inner side and in sealed contact with the side wall of the column tube (3) on the outer side.

5. The sealing assembly between the column head and the column tube according to claim 1, characterized in that: The outer sides of the scraper ring (2) and the annular sealing portion (21) are provided with sawtooth-shaped protrusions (22).

6. The sealing assembly between the column head and the column tube according to claim 5, characterized in that: The sawtooth-shaped protrusion (22) is also provided on the inner side of the scraper ring (2).

7. The sealing assembly between the column head and the column tube according to any one of claims 1 to 6, characterized in that: A sealing ring (4) is also provided on the periphery of the column head (1). The sealing ring (4) is provided above the scraper ring (2). The inner side of the sealing ring (4) is in contact and sealed with the side wall of the column head (1) and the outer side is in contact and sealed with the side wall of the column tube (3).

8. A chromatographic column, comprising a column head (1) and a column tube (3) arranged on the periphery of the column head (1), characterized in that: It also includes a sealing assembly between the column head and the column tube according to any one of claims 1 to 7.

9. The chromatographic column according to claim 8, characterized in that: The column head (1) comprises a back plate (11), a distributor (12) and a screen assembly (13) which are arranged in sequence from top to bottom; the back plate (11), the distributor (12) and the screen assembly (13) are connected via a threaded fastener (14); the scraper ring (2) is arranged on the peripheral side of the screen assembly (13); and the sealing ring (4) is arranged on the peripheral side of the distributor (12).

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