JPS5987367A - Dispenser of automatic analyzing device - Google Patents

Abstract

PURPOSE:To store the abrasion dust of rings brought into contact closely with the inner wall between the rings and to make the dust not to outflow to the flowing channel, by providing one more ring not brought into close contact with the inner wall of a cylinder at the higher position than the ring with which liquid is brought into contact. CONSTITUTION:By providing a ring 21 not brought into contact with a cylinder and having approximately 0.1mm. gaps DELTAl between the cylinder and the ring at the higher position than a ring 17, the abrasion dust of the ring 17 is stored between the ring 21 and the ring 17. Thus, the outflow of the abrasion dust to the flowing channel can be prevented. By this method, the misoperation of a checkvalve or a solenoid valve is removed, suction and discharge operations are carried out normally, the weighing accuracy is improved, and further the long life of the device can be expected.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a dispenser for weighing liquid samples and reagents for an automatic analyzer, and is particularly suitable for performing accurate weighing without clogging the flow path system. Regarding the dispenser.

[Prior art]

Conventional dispensers have been able to measure liquid without leaking due to the piston seal that is in close contact with the inner wall of the cylinder, but the piston seal that is in close contact with the cylinder wears out and its debris clogs all parts of the flow path system. This also affected the accuracy of weighing liquid samples.

[Purpose of the invention]

It is an object of the present invention to provide a dispenser that prevents piston seal wear debris from flowing out into the flow path system, improves the accuracy of weighing liquid samples or reagents, and extends the useful life of the piston seal.

[Summary of the invention]

The present invention confirmed through mounting tests and field results that wear debris of the piston seal is accumulated between the rings formed on the piston seal, and furthermore A ring is installed in close contact with the inner wall of the cylinder to prevent wear debris from the rings that are in close contact with the inner wall from accumulating between the rings and flowing out into the flow path.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a functional diagram of a system configured to weigh and dispense a liquid sample or reagent, and then to clean the channel system. 1 is a container in which a liquid sample or reagent is contained. As the piston 3 of the dispenser 2 descends, the probe 4
Weigh the specified amount of liquid inside. Thereafter, as the piston 3 rises, the liquid is discharged into the reaction cell 5 by the movement of the probe 4. The probe 4 then moves to the cleaning tank 6 and descends therein, and the piston 8 of the dispenser 7 rises, opening the solenoid valve 9 and discharging the cleaning liquid in the dispenser 7 into the dispenser 2. The liquid is ejected at high speed from the tip of the probe 4 through the inside, and is washed into the flow path system. When this operation is completed, the solenoid valve 9 is closed.

At the next timing, the piston 8 descends, and the distilled water 11 in the tank 10 passes through the check valve 12 and is stored in the dispenser 7.

If the above series of operations is repeated tens of thousands of times, the sealing material attached to the piston 8 in the dispenser 7 will wear out. FIG. 2 shows the structure of the dispenser 7. Further, FIG. 3 shows a conventional piston seal portion, and FIG. 4 shows a piston seal portion of the present invention.

First, in FIG. 2, reference numeral 13 denotes a branching part, and a cylinder 15 and branching part 13 are layered with each other with a 14-piece screwdriver to hold the cylinder 15 and the branching part 13 together to prevent liquid leakage. The piston seal 16, which is in close contact with the inner wall of the cylinder 15, is tightened by a nut 17 and the piston 8
is fixed.

Describing the conventional piston seal part in detail in FIG. 3, the piston seal 16 that is in close contact with the cylinder 151fC at two locations has two rings 17 and 18 on the outer periphery.
The O'J songs 9 and 20 fitted into the two grooves carved around the piston 8 push the piston 8 toward the outer periphery, further improving the adhesion. In the piston seal 16 having this configuration, wear debris accumulates between the two rings 17 and 18 due to tens of thousands of operations, while the debris flows out into the liquid on the ring 17 side. The debris that flows out is removed from the check valve 12.
, solenoid valve 9, probe 4, etc., causing malfunction or completely clogging the flow path.

As shown in FIG. 3, the present invention provides a ring 21 above the ring 17 that is not in close contact with the cylinder and has a gearing Δt of approximately 0.1 vrIR, so that wear debris of the ring 17 is disposed between the rings 21 and 17. It gets stuck in the groove.

Therefore, it is possible to prevent wear debris from flowing into the flow path system.

〔Effect of the invention〕

Therefore, by implementing the present invention, malfunctions of the check valve 12 and the solenoid valve 9 when the flow path system is clogged are eliminated, and the suction and discharge operation of liquid samples and reagents is performed normally, thereby improving weighing accuracy. As a result, the piston seal 16 has great effects such as less frequent replacement and a longer service life.

[Brief explanation of the drawing]

Figure 1: Diagram of the brim liquid flow path, Figure 2: Dispenser configuration diagram, Figure 3:
The figure is a conventional diagram of a piston seal structure, and FIG. 4 is a diagram of the piston seal structure according to the present invention.

Claims (1)

[Claims] 1. This is an automatic analyzer that reacts a liquid sample with a reagent and automatically measures its absorbance. It consists of a cylindrical cylinder, a piston seal and a piston that are in close contact with the inner wall of the cylinder, and is configured to weigh a predetermined amount of the liquid sample and reagent. In a dispenser equipped with a piston that holds a seal, a piston seal incorporating a plurality of rings in close contact with the inner wall of the cylinder and at least one ring with a slight gap from the inner wall of the cylinder is incorporated. Dispensing device for automatic analysis equipment.