JPS6318628Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid storage tank, and more particularly to a liquid storage tank that is filled with an inert gas above the liquid level regardless of fluctuations in the liquid level within the tank.

Conventionally, when storing pure water, which is used as a cleaning liquid for electronic parts, etc., in a tank, the space above the water surface in the tank is filled with an inert gas such as nitrogen gas to prevent air from contaminating the pure water. The tank is operated by introducing and discharging nitrogen gas as the water level changes, but with conventional tanks, new gas is supplied to the tank and disposed of outside the tank each time the water level changes. Because of this, a large amount of nitrogen gas had to be consumed, making it extremely uneconomical. In order to solve this problem, a flexible diaphragm is installed inside the tank, and an inert gas is filled between the liquid level and the diaphragm, so that the diaphragm can be moved in response to changes in the liquid level. A tank is proposed. However, in the proposed method, when receiving liquid for the first time, the user descends from the tank roof above the diaphragm using a rope ladder, manually opens the valve on the diaphragm, removes the air or inert gas under the diaphragm, and then Since it is essential to close the valve and go out of the tank again using a rope ladder, there is a risk of falling when descending from the tank roof to the top of the diaphragm using a rope ladder. Please use an air cylinder or line mask, etc.
The additional work involved in ensuring the supply of air was cumbersome.

The present invention has been made to eliminate the above-mentioned conventional drawbacks, and for this reason, the present invention provides a liquid storage tank in which the liquid level in the tank is filled with an inert gas regardless of fluctuations in the liquid level within the tank. A flexible diaphragm is provided on the liquid inlet side of the tank, the outer periphery of which is in close contact with the inner wall of the tank so as to retain a certain amount of the inert gas, an air vent valve is provided in the tank body above the diaphragm, and the diaphragm A flexible conduit equipped with an air vent valve is connected to the center of the tank, and the air vent valve is located at the top of the tank.

In the tank of this invention, the inert gas (or air) under the diaphragm can be vented by opening and closing the air vent valve installed at the top of the tank (at the tank attic or on the roof), preventing it from entering the tank. , there is no risk of falling or oxygen deficiency, and the work is safe.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 are diagrams showing an embodiment of the present invention, in which 1 is a tank body, 2 is pure water stored in the tank body, 3 is a water inlet, 4 is a water outlet,
5 is an overflow mechanism, 6 is nitrogen gas sealed above the liquid level in the tank, 7 is a flexible diaphragm that retains the nitrogen gas 6 on the liquid introduction side within the tank body, and 8 is provided at the top of the tank body 1. An Atmos valve for air venting; 9 is a manhole; 10 is a flexible conduit for air venting connected between the center of the diaphragm 7 and the manhole; 11 is a valve for air venting provided near the end of the conduit 10; 12 is a pressure gauge, 13 is a pressure reducing valve, and 14 is a nitrogen gas cylinder.

The diaphragm 7 is made of a material having appropriate flexibility and strength, such as rubber or rubber-coated cloth, and its outer periphery is hermetically fixed along the inner wall of the tank. The amount of nitrogen gas 6 held by the diaphragm 7 is approximately constant regardless of fluctuations in the liquid level, and is supplied into the tank from the gas cylinder 14 via the pressure reducing valve 13 at the start of operation.

The overflow mechanism 5 isolates the inside of the tank body from the outside and keeps the liquid level in the tank constant when the tank is full.

The air venting conduit 10 and valve 11 are for venting air from inside the diaphragm 7 before introducing nitrogen gas into the tank. Valve 1
By opening and closing 1 from the outside of the tank at the top of the tank, air can be removed from inside the diaphragm 7, so there is no risk of falling or oxygen deficiency, and the work is safe. Further, the diaphragm 7 gradually expands into a dome shape as the air is vented, and the air is vented from the center of the top of the dome-shaped diaphragm, so that the air can be vented completely.

The storage tank constructed as described above maintains a constant amount of nitrogen gas 6 above the liquid level at all times by absorbing vertical fluctuations in the liquid level in the tank by expanding and contracting the diaphragm 7 as shown in the figure. It is extremely economical because there is no need to dispose of nitrogen gas every time the liquid level changes up or down. Also, diaphragm 7
Since the structure is relatively simple, the manufacturing cost is low, and since the diaphragm is installed within the tank body, no particular installation space is required and it can withstand long-term use. In addition, since air or inert gas can be removed without entering the tank, there is no risk of falling or oxygen deficiency, and the work is safe.

Although the above embodiment specifically describes a storage tank in which nitrogen gas is sealed in a pure water tank, the present invention is not limited to this, and the present invention is applicable to a wide range of applications in which an inert gas is sealed above the liquid level in the tank to protect the liquid from air contamination. It can be applied to liquid storage tanks.

As described above, the present invention is extremely economical because the gas once introduced into the tank can be used permanently without discarding the inert gas every time the liquid level in the tank changes up and down. A liquid storage tank that has a simple structure, can be manufactured at low cost, does not require any particular installation space, and is suitable for long-term use can be obtained. In addition, since air or inert gas can be removed without entering the tank, there is no risk of falling or oxygen deficiency, and the work is safe.

[Brief explanation of the drawing]

1 and 2 are diagrams showing an embodiment of the present invention, with FIG. 1 showing the state when the water is full and FIG. 2 showing the state when the water is low. 1...Tank body, 2...Pure water, 6...Nitrogen gas, 7...Diaphragm, 8...Atmos valve, 1
0... Conduit, 11... Air vent valve.

Claims (1)

[Scope of utility model registration request] In a liquid storage tank that is filled with an inert gas above the liquid level regardless of fluctuations in the liquid level in the tank, the outer periphery of the tank is designed to hold a certain amount of the inert gas on the liquid introduction side of the tank. A flexible diaphragm is provided in close contact with the inner wall, and an air vent valve is provided in the tank body above the diaphragm.
A liquid storage tank characterized in that a flexible conduit provided with an air vent valve is connected to the center of the diaphragm, and the air vent valve is disposed at the top of the tank.