JPS5912594Y2 - Micro flow cell mounting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting device for a micro flow cell for liquid chromatography, and more particularly to a cell mounting device that can evenly tighten upper and lower holders by operating one control member.

2. Description of the Related Art Conventionally, a device as shown in FIGS. 1 and 2 has been used as a mounting device for a micro flow cell for a liquid chromatograph used in a fluorescence photometer or the like.

In FIG. 1, 1 is an upper holder and 2 is a lower holder, between which a glass cell 4 is placed between two upper and lower Teflon packings 3.

The lower holder 2 is fixed to the sub-base 5, and four long screws 6 are passed between the upper holder 1, the lower holder 2, and the sub-base 5, and these four long screws 6 are individually tightened. By going, Teflon packing 3
Crush and seal between the upper and lower holders and the cell.

Note that 7 is a stainless steel pipe through which the sample flows.

In the device shown in Fig. 2, the upper base 1 is fixed to the varnish 5 located above, and the long screw 6 is inserted from below.
The micro flow cell is basically the same as the example shown in FIG. 1 except that the micro flow cell is attached using sufficiently long screws.

However, such a conventional example has the following drawbacks.

(1) It is very difficult to screw in the four long screws separately and tighten them evenly, resulting in poor sealing and easy leakage. (2) To prevent leaks, tighten the long screws even more. (3) The outside of the glass cell is square and faces a single beam of light. However, the method of fixing with four long screws is difficult to expose the surface, and since the fixation is unstable, it will easily move if external force is applied.
) When a leak occurs in the Teflon packing, the cell moves when the four long screws are tightened and it is necessary to relevel the cell. (5) As a result of the above, assembly workability is poor.

The present invention eliminates the drawbacks of the conventional example, and enables equal tightening between the upper and lower holders by operating one control member.
The purpose of this mounting device is to provide a mounting device that can easily expose the surface of the cell.This mounting device has a plurality of pillars erected on the sub-base that supports the lower holder, and a plurality of pillars are installed along the pillars at positions corresponding to the pillars on the upper holder. A hole is provided in a shape that allows it to freely slide, a flange having a female thread in the center is fixed to the upper end of the support, and a press screw for vertical adjustment is engaged with the female thread of the flange, It is characterized in that the lower end of the set screw comes into contact with the upper surface of the upper holder, and the downward movement of the set screw tightens the gap between the upper and lower holders.

An embodiment of the present invention will be described in more detail below with reference to FIG.

In the figure, the same reference numbers as in Figures 1 and 2 indicate the same items.

In FIG. 3, a glass cell 4 is placed between an upper holder 1 and a lower holder 2 between upper and lower Teflon packings 3, and by tightening the upper and lower holders, the Teflon packing is crushed and a seal is formed between the upper and lower holders and the cell. The cells are attached in the same way as before.

In the mounting device of the present invention, a plurality of (hereinafter described as four) pillars 8 are erected on the sub-base 5 that supports the lower holder.

Four holes are provided in the upper holder 1 at positions corresponding to the pillars 8 so as to be pushed into the pillars and to allow free sliding of the upper holder along the pillars.

For example, as shown in the figure, two of the four holes 9 and 10 are larger than the support, one hole 11 is a hole that fits snugly with the support, and the remaining hole 12 is a hole that fits snugly with the support. If it is a long hole, even if the positional accuracy of the four pillars is not accurate,
The upper holder 1 can smoothly slide up and down using the pillar as a guide.

A flange 14 is fixed to the upper end of the support column 8 by a flange fixing screw 13, and a female screw 15 is formed in the center of the flange 14.

15 is a set screw having a threaded portion on the outer periphery, and this set screw 1
5 is engaged with the female thread of the flange 14.

When the set screw 15 is turned and lowered, the lower end of the set screw comes into contact with the upper surface of the upper holder 1, and when the set screw is further screwed in, the upper holder is guided by the four pillars and lowered.
The upper and lower holders are evenly tightened.

To expose the surface of the cell 4, remove the mounting screw 17 of the mask 16,
This can be done accurately by screwing and fixing a setting jig (not shown) into this hole and aligning it with this fixture.

Furthermore, since the lower holder 2 is free with respect to the support column 8 as shown in the figure, centering of the upper and lower holders can be easily performed by passing a thin rod-shaped jig through the hole through which the liquid passes.

As described above, according to the present invention, it is possible to tighten the upper and lower holders evenly by simply screwing in a single set screw, and therefore the sealing performance is good and there is no leakage or tilting of the cell.
As a result, a micro flow cell mounting device is obtained that hardly causes the expensive cells to break.

Furthermore, since the cell is fixed by lowering the upper holder using the four pillars as guides, it does not move easily even if external force is applied, resulting in good stability.

Furthermore, even if liquid leakage occurs, the leakage can be easily prevented by simply turning one set screw, and there is no need to relevel the cell.

[Brief explanation of the drawing]

Figure 1A and opening are respectively a sectional view and an exploded perspective view showing a conventional micro flow cell mounting device, Figure 2 is a sectional view showing another conventional micro flow cell mounting device, and Figure 3A and opening are respectively the present invention. FIG. 2 is a cross-sectional view and an exploded perspective view showing a micro flow cell mounting device according to the present invention. 1... Upper holder, 2... Lower holder, 3... Teflon packing, 4...
...Glass micro flow cell, 5...Sub base, 6...Long screw, 7...Stainless steel pipe, 8...Strut, 9,10, 11. 1
2... Hole provided in the upper holder, 13...
...Flange fixing screw, 14...Flange, 14'...Flange screw, 15...
Pressure screw, 16...Mask, 17...Mask mounting screw.

Claims (1)

[Scope of utility model registration request] In the micro flow cell mounting device, a micro flow cell for liquid chromatography is placed between the upper and lower holders by sandwiching them between two upper and lower Teflon packings, and the cell is set in a predetermined position by tightening the upper and lower holders. A plurality of pillars are erected, holes are formed in the upper holder at positions corresponding to the pillars in a shape that allows for free sliding along the pillars, and the upper ends of the pillars are provided with a female thread in the center. The flange was fixed, a set screw for vertical adjustment was engaged with the female thread of the flange, and the lower end of the set screw came into contact with the top surface of the upper holder, so that the lower end of the set screw tightened the space between the upper and lower holders. Features a micro flow cell mounting device.