JPH0528518Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a blind stopper used when storing columns for high performance liquid chromatography.

(Prior Art) In order to maintain separation performance, columns used in high-performance liquid chromatography devices are sealed at the ends of the column with blind stoppers when not in use to prevent internal solvent from disappearing.

Blind plugs used for this purpose are made of metal or polychlorotrifluoroethylene, which is a hard corrosion-resistant resin.

By the way, the column has two different types of ferrule fitting parts F and F' attached to the end of the main body K so that either a normal ferrule type joint or a reverse ferrule type joint can be engaged (see Fig. 4). a, b),
It is configured to be adaptable to the equipment used. For this reason, not only is it necessary to manufacture the abutting part of the blind stopper to match the shape of the ferrule, but in the case of the former, there is a risk of scratching the inner surface of the fitting part due to friction between metals, and in the case of the latter, In the case of objects, there is a risk of breakage due to impact to the gripping part.

In order to solve this problem, as shown in Fig. 5, the gripping part A and the threaded part B are bonded to the tip of the stopper body made of metal with polytetrafluoroethylene to form the abutting part C. something is proposed.

According to this, the elastic force and slipperiness of the polytetrafluoroethylene that forms the contact part C improves the sealing performance and protects the surface, and the strength of the metal prevents breakage accidents. There is a problem in that not only the parts easily separate from the main body, resulting in a lack of durability, but also a joining operation between extremely different materials, metal and polytetrafluoroethylene, is required, leading to an increase in costs.

(Purpose) The present invention was developed in view of these problems, and its purpose is to create an inexpensive and highly durable column that can be commonly used regardless of the shape of the ferrule fitting part. Our objective is to provide blind plugs for use in the industry.

(Example) Therefore, the details of the present invention will be explained below based on the illustrated example.

FIG. 1 shows an embodiment of the present invention, and the reference numeral 1 in the figure is a blank stopper for a column, which is a feature of the present invention, including a grip part 1a, a threaded part 1b, and an abutment part 1.
c is integrally formed from polytetrafluoroethylene, and can be molded by cutting a rod-shaped material of polytetrafluoroethylene.

The threaded portion 1b is selected to have a length that slightly protrudes from the column end when the tip of the contact portion 1c contacts the ferrule fitting portion, and
is formed by chamfering the tip so that it is thicker than the diameter _r2 of the joint pipe p of the ferral type column.

In this example, when the blank stopper 1 is inserted into the column end and screwed together in order to store a positive feral type column, the threaded part 1b is formed into the thread groove of the column due to the high lubricity peculiar to polytetrafluoroethylene. It progresses while smoothly screwing together. In this way, when the tip of the abutting part 1c contacts the tapered part and feels resistance to rotation, if the abutting part 1c is rotated a little further, the diameter of the tip of the abutting part 1c will be the same as the diameter of the tip of the tapered part T. , if it is thin, it receives a pressing force from the threaded part 1b and slides on the surface of the tapered part T, deforming elastically due to its elasticity so as to conform to the tapered shape and sealing the tapered part T. Even if it is thicker than the diameter of the tip of the ferrule, it contacts the pedestal S of the ferrule, receives the pressing force from the threaded portion 1b, and deforms its tip into a convex shape to match the edge of the taper, thereby sealing the ferrule. Figure 2). At this time, the contact portion 1c is elastically compressed in the axial direction and maintains a constant state of close contact with the tapered portion T, while the threaded portion 1b receives this reaction force and is prevented from loosening with the ferrule fitting portion.

In the sealed state, the solvent in the column reaches the contact part 1.
Even if it comes into contact with the grip part 1a of the blind stopper 1, it will not deform due to the solvent resistance of polytetrafluoroethylene.
If an impact is applied to the threaded portion 1b protruding from the column or column, the elastic force of polytetrafluoroethylene will allow the impact to be absorbed and breakage may occur.

On the other hand, when a column for a reverse ferrule type is sealed using a blind stopper of the same shape, the abutment part 1c contacts the pedestal S of the reverse ferrule, and receives the pressing force from the threaded part 1b to connect the tip of the column to the joining pipe port. The joint tube opening is sealed by deforming it so that it matches the shape of the tube (Fig. 3).

Furthermore, even if a used blind stopper is used in a column with a different ferrule type, it is elastically deformed in accordance with the ferrule type to seal the joint port, and the stable state of the column is maintained and stored.

(Effects) As explained above, in this invention, the gripping part, screw part, and contact part are integrally formed from polytetrafluoroethylene, which not only simplifies the processing work but also The elasticity of polytetrafluoroethylene allows it to be elastically deformed to match the shape of the column end, ensuring a secure seal, and absorbing shock to prevent accidental breakage, making the column stable and highly reliable. The lubricity of polytetrafluoroethylene allows for smooth screwing and surface protection, and the solvent resistance provides high durability.

In addition, since the abutment portion is made larger than the diameter of the connecting tube, it can be used in common regardless of whether it is a normal ferrule type or a reverse ferrule type, which not only reduces manufacturing costs but also prevents damage to the column due to incorrect loading.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of the present invention, Figs. 2 and 3 are cross-sectional views showing the state in which the columns for normal and reverse ferrule types are sealed with the same blank plugs, respectively, and Fig. 4 A and B. FIG. 5 is a sectional view showing a normal column and a reverse ferrule type column, respectively, and FIG. 5 is a sectional view showing an example of a conventional blind stopper for a column. 1... Blind stopper, 1a... Gripping part, 1b... Threaded part, 1c... Contact part.

Claims (1)

[Scope of utility model registration request] The gripping part, the screw part, and the contact part are integrally formed from polytetrafluoroethylene, and
A blind stopper for a high performance liquid chromatography column, wherein the abutment portion is formed to have a diameter larger than the joint pipe diameter of the ferrule type column.