JPH0416061Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a gas inlet for liquefied gas products such as gas lighters and aerosol sprayers, and is designed to prevent vaporization from occurring in the liquefied gas storage tank due to high temperatures, etc. It is equipped with a safety device that releases this gas to the outside when the internal pressure is high.

(Prior art) When replenishing the gas lighter, etc. with liquefied gas as fuel, the gas lighter is turned upside down so that the bottom is facing upward, and then the replenishment gas container is inserted into the injection port provided at the bottom. In this case, part of the injected gas and the liquefied gas remaining in the tank vaporize, which must be taken out to the outside. There is a device like the one shown below. As shown in the figure, this device has a valve hole on the circumference inside a short pipe 1' that protrudes into the liquefied gas tank and whose upper end surrounds the gas inlet, and the tip of the replenishment gas container is pressed against the upper end. The injection stem 3' is always inserted into the raised state by the spring 11', and when the gas is not injected, the injection stem 3' is raised by the spring 11' as shown in FIG. 3A. The space between the short pipe 1' and the tank is closed by a stem rubber 7', and the inside of the tank is isolated from the outside. However, when the injection stem 3' is pressed down by pressing the top end of the supply gas container against the upper end, As shown by the arrow in Figure 3B, the liquefied gas that has flowed into the injection stem 3' enters the short pipe 1' through the valve hole 4', and the lower end of the short pipe 1' flows down into the tank. The vaporized gas passes through the valve hole 8' of the short pipe 1', rises along the outer periphery of the injection stem 3', and is released to the outside, and the inflowing liquefied gas is crushed and deformed as the injection stem 3' descends. The stem rubber 7' prevents leakage to the outside.

(Problem to be solved by the invention) However, in the conventional device shown in Fig. 3 above, when liquefied gas is not supplied, that is, in normal times, the pipe between the short pipe and the injection stem as shown in Fig. 3A is Since the tank is closed via the stem rubber, if the internal pressure increases, there is a risk that the tank will explode and be destroyed.

(Means for solving the problem) For this purpose, it is sufficient to interpose an inner pipe that releases the blockage in response to abnormal pressure between the short pipe connected to the tank body and the injection stem. This idea was developed focusing on the above points.

(Embodiment of the invention) An embodiment of the invention will be described with reference to FIG. However, a valve hole 4 is provided on the side surface.

Next, 5 is an inner tube inserted between the short tube 1 and the injection stem 3, and is structurally formed by screwing together the upper and lower parts, with the upper end of the upper part projecting outward. An O-ring 7 is fitted to the tube formed in the collar 6 and connected to the inner surface of the short tube 1 on its lower surface, and has a valve hole 8 on its circumferential surface, and this valve hole 8 and the valve hole 4 of the injection stem 3 A ring-shaped packing 9 with a square cross section is located between
is inserted. A spring 10 is interposed between the lower end of the inner tube 5 and the lower end of the short tube 1, and the inner tube 5 is always pushed down as shown in A of the same figure, crushing and deforming the O-ring 7, thereby compressing the inner tube. 5 and the short pipe 1 is sealed. Similarly, a spring 11 is interposed between the lower end of the inner tube 5 and the lower end of the injection stem, and the injection stem 3 is always held in the raised position via this spring 11.

(Function/Effect) This device has the above-mentioned structure, and as shown in FIG. When the liquefied gas is injected into the liquefied gas container, press the tip of the supply gas container against the tip of the injection stem 3 and press down against the spring 11 (not shown). In this case, the liquefied gas flows into the inner pipe 5 from the valve hole 4 due to the deformation of the annular gasket 9 due to the lowering of the injection stem 3, and the vaporized gas in the tank flows through the valve hole 8.
is emitted to the outside through the outer periphery of the injection stem 3.

Next, if the internal pressure inside the tank increases abnormally due to external high temperature etc. without gas injection, this gas pressure will enter between the short pipe 1 and the inner pipe 5,
The piston-shaped inner tube 5 is pushed up by the flange 6 overcoming the force of the spring 10, leading to the state shown in FIG. The gas can be discharged to the outside through the space between the short tube 1 and the inner tube 5 as shown by the arrow in FIG.

FIG. 2 shows a modification of FIG. 1, in which the spring 10 that presses down the inner tube 5 is not provided between the inner tube and the gas inlet portion of the tank body 2. Other parts are indicated by the same reference numerals as in FIG. 1, and can operate in the same manner as in FIG. 1, as shown in A and B of the same figure.

As mentioned above, this design has a safety valve for degassing at the gas inlet of the tank body, and it is not installed separately, so it has a good appearance, and it also has a safety valve for degassing every time liquefied gas is injected. Since the function of this safety valve is also checked, there are many advantages such as greater reliability.

[Brief explanation of drawings]

Fig. 1 and Fig. 2 show an embodiment of this invention, Fig. 1 A, B and Fig. 2 A, B are vertical sectional views showing the normal state and operating state, respectively, and Fig. 3 A, B are the conventional FIG. 3 is a vertical cross-sectional view showing the gas injection port in the normal state and the state in which the gas is injected. 1... Short pipe, 2... Tank body, 3... Injection stem,
4, 8...Valve hole, 5...Inner pipe, 6...Brim portion, 7
...O-ring, 9...Ring-shaped packing, 10,11
……Spring.

Claims (1)

[Scope of utility model registration request] Inside a short pipe 1 which surrounds the gas inlet and hangs vertically in the tank body, the upper end is formed into a collar part 6, and an O
The inner tube 5 with the ring 7 interposed therein is constantly lowered by the spring 10, the O-ring 7 interposed between the inner tube 5 and the short tube 1 is crushed, and the inside of the tank is cut off from the outside of the tank. When the pressure inside the tank increases and strong pressure is applied to the collar 6, the inner tube 5 rises and is inserted so that the inside and outside of the tank are communicated, and the upper end is opened inside the inner tube 5. An injection stem 3 whose lower end is closed and has a valve hole 4 on the circumferential surface near the lower end is fitted so as to be constantly raised within the inner tube 5 by a spring 11, and when the injection stem 3 rises, it forms a ring shape. Valve hole 4 by packing 9
A liquefied gas product characterized in that the valve hole 8 provided in the inner pipe 5 is closed, and the valve port 4 and the valve hole 8 communicate with each other when the injection stem 3 descends. Inlet.