JPS6314953Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a fixed-quantity injection device for a liquid that tends to generate bubbles, such as a sodium hypochlorite solution used for disinfecting tap water.

In recent years, sodium hypochlorite solution has been used to disinfect tap water instead of chlorine gas.
Concentrated solutions of sodium hypochlorite are unstable, and their decomposition generates microbubbles of oxygen gas, which accumulate in pipes and frequently cause problems with vapor locks in pipes. Water treatment plants use a large amount of the above solution, so it is disadvantageous to dilute the solution to a concentration of about 4%, which is a concentration that is difficult to decompose, due to the economical considerations of storage tank volume.Usually, a solution with a concentration of about 12% is used. However, there are many differences in stability depending on the product, and products containing impurities such as iron are extremely unstable, and as the liquid temperature rises, microbubbles are constantly generated and the product becomes unstable. There are cases where normal measures such as simply creating a slope in the piping or installing a degassing tank are insufficient.
At present, we are struggling to find countermeasures.

This idea was devised in view of the above-mentioned circumstances, and its purpose is to improve the operating function of conventional equipment by simply modifying it slightly, and to reduce the occurrence of the aforementioned troubles as much as possible. .

This invention will be explained in detail below based on the accompanying drawings.

As shown in the drawing, attached to a large-capacity liquid storage tank 1 that holds the amount of liquid to be used for several days, there is also a defoaming and small-volume storage tank that stores a small amount of liquid, for example, the amount of liquid to be used for about 1 to 2 hours. A defoaming tank 2, which is a liquid tank, is provided, and both of them are communicated through a relatively thick liquid sending pipe 3, and an electric valve 4 is disposed in the middle of the pipe, and this electric valve controls liquid feeding and closing during operation of the device. 4.

In addition to the defoaming exhaust pipe 5 and the float valve 6 for preventing overflow, the defoaming tank 2 is equipped with a liquid level gauge 7 which is a liquid level detection means, and this liquid level gauge 7 is equipped with a floatless switch and a level alarm device. Liquid feed pipe 3 via 8
The electric valve 4 is electrically connected to the electric circuit 9, and when the liquid level reaches a predetermined high level, the electric valve 4 is connected to the electric circuit 9.
Similarly, when the liquid level reaches a predetermined low level, the electric valve 4 is opened to fill the defoaming tank 2 with liquid. By doing this, the liquid flowing from the liquid storage tank 1 to the defoaming tank 2 is controlled by the electric valve 4.
As the valve opens, the flow velocity temporarily increases due to the liquid level difference with the liquid storage tank 1. During this time, the air bubbles that were stagnant in the cavity of the liquid supply pipe 3 due to the viscous liquid Since the liquid is also forcibly carried into the degassing tank 2, vapor locking of the liquid sending pipe 3 can be prevented.

Furthermore, at the solution outlet of the degassing tank 2, a through hole with a diameter of, for example, 30
By providing a precision filter 10 of about 50μ, impurities suspended in the solution can be gradually and precisely separated, improving the stability of the solution.
This can reduce the decomposition effect of the subsequent solution.

The liquid passed through the precision overtube 10 is then metered and injected into an injection point via a conduit 12 by an injection pump 11.

In addition, in the drawing, 13 is a measuring tube for actually measuring and testing the amount of liquid delivered by the injection pump 11, and 14 is a galvanometer with a ball loosely sealed in the transparent tube to check whether the liquid is being sent. .

As mentioned above, this device is useful for injection of sodium hypochlorite because effective solution injection can be performed by simple structural modification.

[Brief explanation of the drawing]

The drawing is a side view of the device according to this invention. In the drawings, 1...liquid storage tank, 2...defoaming tank, 3...liquid pipe,
4...Electric valve, 7...Liquid level detection means (liquid level meter),
10... Precision tube, 11... Infusion pump.

Claims (1)

[Scope of utility model registration request] A fixed-rate injection device in which a liquid storage tank, a defoaming tank, and an injection pump are connected in series, and the liquid storage tank and the defoaming tank are communicated with each other by a liquid sending pipe equipped with an electric valve. A liquid level detecting means for detecting the liquid level in the tank is electrically connected to the electric valve to open and close the electric valve, and the defoaming tank and the injection pump are communicated via a precision tube. A quantitative injection device for liquids that tend to generate bubbles.