JPS6330675Y2 - - Google Patents

Description

[Detailed explanation of the invention] Liquid tanks used in agricultural sprayers, etc.
It is common to install a venting device (breather) to prevent the internal pressure of the tank from decreasing as the stored liquid is consumed, but if the stored liquid is highly corrosive or flammable, such as agricultural chemicals or gasoline, Care must be taken to prevent liquid leakage from the ventilation system.

Although various venting devices have been proposed for this purpose, the present invention aims to provide a venting device that uses a ball valve body, has a simple structure, and can reliably prevent liquid leakage.

Next, the present invention will be explained in detail based on the embodiment shown in the figures.

The figure is a sectional view of a main part of a liquid tank such as a wheeled hand-held sprayer, and the liquid injection port 2 provided on the top surface of a liquid tank 1 made of synthetic resin or the like is screwed onto an injection port cover 3 via a gasket 4. It can be sealed by wearing it. A discharge port cover 14 having a ventilation opening 5 is provided at the lower corner of the tank 1 . A tube member 6 is disposed facing downward at the center of the back surface of the injection port cover 3. The tube member 6 is rotatably attached to the inlet cover 3 via a cup-shaped flange 8 integral with the tube member 6, with its upper end 9 brought close to the back surface of the inlet cover 3, leaving an air flow gap 15. It is worn. The pipe member 6 serves as a valve casing with a funnel-shaped valve seat 11 provided in the middle of its internal passage, and an upper end 9.
A small-diameter ball valve body 10 is inserted into the upper end internal passage made of stainless steel or the like, and its lower side is always brought into contact with the valve seat 11 due to its own weight, thereby closing the valve body. Further, the lower end of the pipe member 6 is communicated with the ventilation opening 5 of the discharge port cover 14 via a flexible communication pipe 7 having a sufficiently long length.

In the illustrated embodiment, a through hole 12 is provided in the cup-shaped flange 8 for the purpose of ensuring air permeability. Note that 13 in the figure is a strainer fitted into the liquid injection port 2.

In this configuration, if the tank 1 is filled with a chemical solution etc. from the liquid injection port 2 and the injection port cover 3 is screwed on,
Since the liquid injection port 2 is sealed by the gasket 4 and the communication pipe 7 is also closed by the ball valve body 10, the stored liquid will not leak to the outside of the tank 1. When the stored liquid is supplied to a chemical liquid pump (not shown) and consumed and the internal pressure of the tank 1 decreases, the ball valve body 10 is pushed up by the external pressure and the outside air is drawn into the ventilation opening 5,
It flows into the tank 1 via the communication pipe 7 and the pipe member 6, and the internal and external pressures are averaged. Since this pressure adjustment action is performed instantaneously, the ball valve body 10 substantially always closes the communication pipe 7, thereby effectively preventing liquid leakage.

As described above, according to the present invention, a valve device that is normally closed by abutting a spherical valve body against a funnel-shaped valve seat by its own weight is disposed in the upper interior of the tank, and the valve device is communicated with the valve seat. By communicating with the ventilation opening via a pipe, the pressure difference between the inside and outside of the tank is automatically averaged, so regardless of changes in the tank's posture,
It is possible to provide a venting device for a liquid tank that can reliably prevent liquid leakage and has an extremely simple structure without worrying about contamination of the machine body, ignition, wastage of chemical liquid, etc. Furthermore, since there is no fear of liquid leakage, the tank can be filled with liquid, reducing the number of refills and increasing work efficiency.

[Brief explanation of the drawing]

The figure is a sectional view of a main part of a liquid tank equipped with an aeration device according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Liquid tank, 5...Vent opening, 6...Pipe member, 7...Communication pipe, 10...Ball valve body, 11...
valve seat.

Claims (1)

[Scope of utility model registration request] A ball valve body 10 is always placed inside the upper part of the liquid tank 1.
A pipe member 6 is provided with a funnel-shaped valve seat 11 that contacts and closes due to its own weight, and the ball valve body 10 side of the pipe member 6 communicates with the inside of the tank 1, and the valve seat 11 side is connected to a ventilation opening 5 provided in the tank 1 via a communication pipe 7.