JPH0551799U - Tank venting device - Google Patents

Abstract

(57) [Summary] [Structure] The atmospheric pressure tank is ventilated through a sealing liquid. The airtight container is divided into upper and lower parts, a distribution pipe penetrating the partition plate is installed, and the upper and lower chambers are filled with the sealing liquid. The upper chamber is provided with a negative pressure suction pipe whose lower end is soaked in a sealing liquid and a vent pipe communicating with the tank, and the lower chamber is provided with a positive pressure discharge pipe. [Effect] A ventilator having no mechanically movable parts structurally can be obtained. Therefore, there is no fear of malfunction due to sticking.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a tank ventilation device for breathing the inside and the outside of an atmospheric pressure tank according to a pressure difference.

[0002]

[Prior Art]

 Tanks that are used under atmospheric pressure, such as cone roof tanks, are used for the inflow and outflow of air when receiving or discharging liquid, and for increasing and decreasing the tank internal pressure due to the expansion and contraction of air or liquid vapor due to changes in temperature. It must be breathable in order to accommodate and not damage the tank.

Conventional atmospheric pressure tanks have a mechanical breathing device called a "breather valve". However, the operation of this device often becomes uncertain due to rust and dirt on the sliding parts after many years of use, and improvements have been sought. The structural parts are generally manufactured by casting, but if the gas in the tank is corrosive, it is necessary to select a material that corresponds to it, and it is inevitable that it will be expensive.

[0004]

[Problems to be solved by the device]

 An object of the present invention is to provide a tank venting device which meets the above-mentioned requirements, and which does not have any moving parts and therefore does not suffer from malfunction due to sticking or the like. It is also included in the object of the present invention to provide a low-cost ventilation device by adopting a structure that is easy to manufacture and widening the choice of materials to be used.

[0005]

[Means for Solving the Problems]

 The tank venting device of the present invention is a venting device for inhaling the inside and the outside of an atmospheric pressure tank according to a pressure difference, and as shown in FIG. An upper chamber (3) and a lower chamber (4) are formed by partitioning the partition plate (2) into upper and lower parts, and a partition pipe is provided with a flow pipe (5) which penetrates the upper chamber and connects the upper and lower chambers. A negative pressure suction pipe (6) is provided to communicate with the atmosphere, a vent pipe (8) is provided to communicate with the inside of the tank (1), and a positive pressure discharge pipe (7) is provided in the lower chamber to communicate with the atmosphere. The upper end (51) of the flow pipe is above the lower end (62) of the negative pressure suction pipe, and the lower end (52) of the flow pipe is below the lower end (72) of the positive pressure discharge pipe. Then, the sealant (9A, 9B) is injected into the upper chamber and the lower chamber.

As a material for forming the ventilation device, generally, a general-purpose piping material equivalent to a tank or a general structural material may be used. For example, if the tank is made of carbon steel, it is also made of carbon steel, and if the tank is made of stainless steel, the ventilation device is made of stainless steel. If the tank contents are acid or alkali, use a material that withstands it, such as polyvinyl chloride. In some cases, it is possible to take corrosion countermeasures such as coating with fluororesin.

[0007]

[Action]

 The sealing liquid of the ventilation device is injected through the sealing liquid inlet (31) provided in the upper chamber (3) to form a negative pressure sealing liquid (9A) in the upper chamber. When the liquid level reaches the upper end of the flow pipe (5), the inside of the pipe is fluidized and reaches the lower chamber (4), so that the height of the liquid level in the upper chamber stops at the same position as the upper end of the flow pipe. The sealing liquid in the lower chamber forms a positive pressure sealing liquid (9B) and overflows through the sealing liquid overflow port (41) to keep the liquid level of the sealing liquid in the lower chamber at a constant height. Be drunk

In this way, the inside of the tank (1) is normally shielded from the atmosphere by the negative pressure sealing liquid (9A) and the positive pressure sealing liquid (9B).

Considering now when the pressure in the tank becomes positive with respect to the atmosphere, the gas in the tank flows into the upper chamber (3) through the vent pipe (8). As shown in FIG. 2, this gas passes through the flow pipe (5), the positive pressure sealing liquid (9B), the lower chamber (4), and is discharged to the atmosphere from the positive pressure discharge pipe (7). .

On the other hand, when the pressure in the tank becomes negative, the gas in the upper chamber (3) is sucked through the vent pipe (8), so that the atmospheric pressure is reduced to the negative pressure suction pipe (6) as shown in FIG. ) Through the negative pressure sealing liquid (9A) into the upper chamber.

In this way, no matter whether the pressure inside the tank is positive or negative with respect to the atmosphere, the gas flows in and out through the sealing liquid to breathe.

When the gas in the tank is harmful and it is not desirable to release it into the atmosphere, a sealing liquid having a property of absorbing the gas is used to make the gas in the sealing liquid into a bubble state. It can absorb this as it passes and reduce its release to the environment. For example, when the content of the tank is hydrochloric acid, the release of hydrogen chloride gas can be suppressed by using caustic soda aqueous solution as the sealing liquid.

[0013]

[Effect of the device]

 Since the tank venting device of the present invention controls the breathing of the tank by using the sealing liquid, there is no moving part like the conventional mechanical breather valve, and there is no need to worry about malfunctions due to sticking. It has high reliability.

As can be understood from the structure described above, this apparatus is easy to manufacture, can use general-purpose piping materials, and does not require a process such as preparing a dedicated casting. Therefore, the cost is low.

Further, by using a sealing liquid that can absorb the gas in the tank, the release of the gas into the atmosphere can be reduced. Therefore, consideration for the environment is also superior to conventional equipment.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of a tank venting device of the present invention, with a conceptual diagram for explaining the relationship with a tank added.

FIG. 2 is a diagram for explaining the operation of the tank ventilation device of FIG. 1 when the pressure in the tank is positive with respect to the atmosphere.

FIG. 3 is a view similar to FIG. 2 for explaining the operation of the tank ventilation device of FIG. 1 when the inside of the tank is under negative pressure.

[Explanation of symbols]

 1 Tank 2 Partition Plate 3 Upper Chamber 31 Sealing Liquid Injection Port 4 Lower Chamber 41 Sealing Liquid Overflow Port 5 Distribution Pipe 6 Negative Pressure Suction Pipe 7 Positive Pressure Release Pipe 8 Vent Pipe 9A Negative Pressure Sealing Liquid 9B Positive Pressure Sealing Liquid

Claims (2)

[Scope of utility model registration request] 1. A ventilation device for breathing the inside and the outside of an atmospheric pressure tank according to a pressure difference, wherein a sealed container is divided into upper and lower parts by a partition plate to define an upper chamber and a lower chamber. The partition plate is provided with a flow pipe that penetrates it to connect the upper and lower chambers, a negative pressure suction pipe is provided in the upper chamber to communicate with the atmosphere, and a vent pipe is provided to communicate with the inside of the tank.
A positive pressure discharge pipe is provided in the lower chamber to communicate with the atmosphere, the upper end of the flow pipe is above the lower end of the negative pressure suction pipe, and the lower end of the flow pipe is below the lower end of the positive pressure discharge pipe. Tank venting device that is opened and filled with sealing liquid in the upper and lower chambers. 2. The tank venting device according to claim 1, wherein a liquid capable of absorbing the gas in the tank is used as the sealing liquid in the lower chamber, and the amount of the gas released when the pressure in the tank is positive is reduced.