JPH0127091Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has a cylinder device connected to the upper part of the flow path between the check valve installed on the suction side and the check valve installed on the discharge side, and The present invention relates to a titrator in which a pumping action is performed.

As shown in FIG. 1, in this type of titrator, the cylinder device 6 is provided above the flow path between the check valves a and b, so that the reagent from the sliding contact between the cylinder 8 and the piston 7 is Although it has the advantage of preventing leakage, as the titration operation is repeated, dissolved oxygen, etc. in the reagent accumulates in the cylinder 8 at the tip of the piston 7, and as a result, the amount of water per reciprocating movement of the piston 7 decreases. The amount of reagent discharged may decrease, resulting in titration errors.

The present invention aims to solve these conventional drawbacks with a simple configuration.

Hereinafter, embodiments of the present invention will be described based on the drawings from FIG. 2 onwards.

FIG. 2 shows an example of a titrator according to the present invention.
is a valve body, and check valves a and b, which are made of a ball 2, a spring 3, a sealing rubber 4, etc., and are oriented in opposite directions, are provided on the suction side and the discharge side, respectively. , b is connected with a cylinder device 6 constructed by using a ready-made syringe. Cylinder device 6
The piston 7 is urged upward by a spring (not shown), and is configured to reciprocate intermittently, for example, once every second, by a driving source such as a solenoid. Therefore, the suction side is connected to a tank containing a reagent such as potassium permanganate.
When the piston 7 is driven with its discharge side connected to a heating tank (or reaction tank), the reagent is delivered in appropriate amounts by the pump action.

Inside the cylinder 8, as will be described later, there is a floating object A that has an appropriate specific gravity difference with the reagent so that it floats following the retreating movement of the piston 7 and descends under its own weight while the piston 7 is in the retreating position. has been inserted.

Note that the valve body 1 may be constructed by connecting two blocks 1a and 1b provided for each check valve a and b with a horizontal pipe 1c, as in the conventional product shown in FIG. In this embodiment, the adhesives 1d are combined into one block for the purpose of preventing clogging of the channel 5 due to protrusion, etc., omitting bonding work, and reducing the number of parts. Further, the valve body 1 is arranged at an appropriate angle (approximately 45° in the drawing, but this angle can be set as appropriate) with respect to the axis of the cylinder device 6.
It is tilted. This is to prevent air bubbles discharged from the communication path 9 to the cylinder 8 into the flow path 5 due to the movement of the floating object A from returning to the communication path 9.

According to the above configuration, when the piston 7 descends (protrudes) to the stroke end and rises again as shown in FIG. 3 A and B, the floating object A follows the piston 7 as shown in FIG. 3 C. and surfaced, piston 7
When the floating object A comes to rest in the raised position, the floating object A descends under its own weight, as shown in FIG. 3D. Therefore, the action of the floating object A prevents the generation of bubbles due to dissolved oxygen, etc. in the cylinder 8, and even if there are air bubbles in the cylinder 8, the bubbles are moved below the floating object A as the floating object A rises. When the floating object A descends, the air bubbles can be discharged into the channel 5.

Note that as the floating object A, it is possible to use any suitable material such as PVC or fluorine rubber that has an appropriate specific gravity difference between it and the reagent, but if the reagent is potassium permanganate, silicone rubber should be used. is desirable. In addition, although the floating object A shown in the figure has a small hole 10 in the vertical direction in the axial center, the difference in specific gravity between the floating object A and the reagent, and the difference between the floating object A and the cylinder 8
Depending on the size of the gap between the inner surfaces, an appropriate shape may be adopted, such as a shape omitting the small hole 10 or a shape having vertical grooves 11 on the outer circumferential surface, as shown in FIGS. 4A and 4B.

As described above, according to the present invention, a floating object is inserted into the cylinder that follows the retreating movement of the piston and descends while the piston is in the retreating position. This discharge action prevents air bubbles from accumulating in the cylinder. Therefore, with a simple configuration such as inserting a floating object, changes in the reagent discharge amount due to the accumulation of air bubbles can be prevented, and titration accuracy can be maintained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the main part showing a conventional example, Fig. 2 is a longitudinal sectional view of the main part showing an embodiment of the present invention, and Fig. 3 is a longitudinal sectional view of the main part showing an embodiment of the present invention.
Figures A, B, C, and D are operational views, and Figures A and B are perspective views showing modified examples of the floating object. A... Floating object, a, b... Check valve, 5... Channel, 6... Cylinder device, 7... Piston, 8
……cylinder.

Claims (1)

[Scope of utility model registration request] In a titrator in which a cylinder device is connected in communication with the upper part of the flow path between the check valve provided on the suction side and the check valve provided on the discharge side, the retracting movement of the piston is followed in the cylinder of the cylinder device. and surfaced,
A titrator characterized in that a floating object is inserted which descends while the piston is in the retracted position.