JPS6042358Y2 - Cell unit for spectrophotometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cell unit used in a spectrophotometer, and particularly to a cell unit for a spectrophotometer in which a corner cell and a flow cell can be arbitrarily positioned in an optical path.

Conventionally, when measuring using a square cell and a flow cell in a visible-ultraviolet spectrophotometer, the usage of both cells is different, so each cell is attached to a separate unit.
When replacing cells, the method used is to replace the unit and set one of the cells in the optical path as appropriate.

However, replacing the unit every time a square cell or a flow cell is set is not only time-consuming, but also has problems in the reproducibility of the set state, and has the drawbacks of being relatively expensive.

The present invention aims to eliminate the above-mentioned drawbacks and provides a cell unit for a spectrophotometer that is convenient to use and has excellent reproducibility.

That is, in the cell unit according to the present invention, a square cell holder from which a square cell can be detached and a flow cell holder to which a flow cell is fixed are provided on the same base to form one unit, and at the same time, the flow cell holder is integrally attached to a switching lever, The switching lever is pivoted on a fulcrum, and the flow cell can be moved in and out of the optical path as desired by manually operating the switching lever.

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

FIG. 1 is a side view of a cell unit according to the present invention, and FIG. 2 is a plan view thereof, in which 1 is a corner cell and 2 is a flow cell.

The square cell 1 is attached to a square cell holder 3, and the square cell holder 3 is fixed to a unit base 4.

Since at least one surface constituting the square cell holder 3 is a presser spring 5, the square cell 1 can be freely attached to and detached from the square cell holder 3.

That is, when performing measurements using a square cell, the flow cell is removed using a switching lever, which will be described later, and the square cell 1 is attached to the holder.When a flow cell is used, the square cell 1 is removed.

On the other hand, the flow cell 2 is fixed to a flow cell holder 6, and the flow cell holder 6 also has a switching lever. !
, and the switching lever 7 is pivotally attached to a support plate 9 via a pivot pin 8.

The switching lever 7 is elastically biased by a switching spring 17 and is held at the normal measurement position.

Since the support plate 9 is also fixed to the unit base 4, the square cell holder 3 and the flow cell holder 6 are ultimately provided on the same unit base 1.

Note that 10 is a flow cell tube, and 11 is a fulcrum holder.

This unit base 1 is placed on the sample section 12 (FIG. 2) of the spectrophotometer, and is positioned and fixed on the optical bench 13 (FIG. 1).

The light passes through both cell parts along the direction of the arrow.

The attachment and detachment of the unit base 1 and the positioning mechanism are carried out using dowel pins 14 and 14' provided on the lower side of the unit base, so that the cell unit can be attached and detached with good reproducibility.

As shown in FIG. 3, the flow cell switching lever 7 is located between the part where the flow cell 2 is in the optical path (solid line), which stands up vertically from the pivot pin 8, and the part which extends obliquely upward from this part. Ru.

A flow cell 2 is fixed above the vertical portion, and the flow cell 2 rotates around a pivot pin 8 and moves from the solid line position to the dashed-dot line position 7, thereby removing it from the optical path.

When the switching lever 7 is returned to its original position, the flow cell 2 is set in the optical path.

At this time, since a stopper 15 is provided for restricting the movement of the switching lever 7 and positioning the flow cell at a predetermined location, the flow cell can be set with good reproducibility.

Reference numeral 16 denotes a stopper for removing the flow cell from the optical path, which restricts movement of the flow cell and flow cell tube more than necessary.

Reference numeral 17 shown in FIGS. 1 and 3 is a spring provided between the switching lever 7 and the support plate 9. The action of this spring is that when the lever position is shifted to one side from the center, a strong elastic force acts in that direction. The structure is such that the lever is always placed in one direction.

Therefore, switching can be easily performed by operating the lever with a single touch, and since the stopper is always pressed against the stopper and an elastic force acts in the direction, reproducibility when setting the flow cell is improved.

When performing measurements using a cell unit configured in this way, first position and fix the cell unit to the sample part, and when using the edge cell, place the corner cell into the corner cell holder and simultaneously turn the switching lever. Just move it and remove the flow cell from the optical path.

Conversely, when using a flow cell, return the switching lever to its original position, place the flow cell into the optical path, and at the same time remove the square cell to perform measurements.

Generally, the sample flowing through the flow cell flows from the bottom to the top to eliminate the influence of flow, but in this invention, when moving the flow cell with the switching lever, the flow of the tube connected to the flow cell is It is important to minimize movement and take care to avoid stagnation or uneven flow; therefore, it is desirable to move the switching lever by pivoting at a single point on the lower side of the lever, as in the embodiment.

As described above, according to the present invention, since both the square cell holder and the flow cell holder are provided on the same unit base, there is no need to replace the unit every time the cell is replaced, and the flow cell holder does not need to be replaced every time the cell is replaced. The switching is
Switching is easy because it can be done with a single touch of a switching lever that is pivoted at one point, and the reproducibility of the cell set position is also improved.

[Brief explanation of drawings]

Fig. 1 is a side view of the cell unit according to the present invention, Fig. 2 is the same (plan view), and Fig. 3 is a front view showing the flow cell and switching lever portions in the cell unit.・Corner cell, 2...Flow cell, 3
・・・・・・Square cell holder 4・・・Unit base, 5・・・Press spring, 6・◆◆・◆・Flow cell holder, 7・・・Switching lever・・・
...Pivot pin, 9...Support plate, 10...
... Flow cell tube, 11 ... Fulcrum holder, 1
2... Sample section, 13... Optical bench, 14
,14'...Dowel pin, 15,16...
・・Stopper 17------ Switching spring.

Claims (1)

[Scope of utility model registration request] In the sample cell unit of a spectrophotometer, a square cell holder with a removable square cell and a flow cell holder with a fixed flow cell are installed on the same base to form one unit, and at the same time, the flow cell holder is integrally attached to the switching lever. A cell unit for a spectrophotometer, characterized in that the switching lever is pivoted at one fulcrum, and the flow cell can be moved in and out of an optical path as desired by manually operating the switching lever.