JPS6115386Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a fuel filler cap provided at a fuel filler port of a cartridge type tank such as an kerosene heater.

<Prior Art> The conventional fuel filler cap shown in FIG. 1 is designed to reduce the noise generated when oil flows from the cartridge tank 1 to the combustion tank 3 via the fuel filler cap 2 during combustion in an oil stove. , a bottomed cylinder 5 is provided covering the valve port 4 of the cap 2 to form a sound deadening cylinder, and an oil flow part 6 is provided on the valve port 4 side of the sound deadening cylinder 5.
A small hole 7 for air outflow is provided on the bottom side, and the air that has flowed in to replace oil is stored in the silencer tube 5 and gradually sent out from the small hole 7 to the cartridge tank 1 as small bubbles. (Refer to Utility Model Application Publication No. 107706/1983).

This will reduce the sound, but the valve opening 4
In order for the air exchanged with oil to reach the small hole 7 on the bottom side of the silencer cylinder 5 without being obstructed by the valve 8, a considerable play (gap) 9 must be provided between the inner wall of the silencer cylinder and the valve 8. This play 9 causes the valve 8 to close to the valve port 4.
There was a drawback that it caused runout and misalignment between the two. Note that if the valve 8 and the valve port 4 are misaligned and the valve shaft 8' is tilted, when the cartridge tank 1 is lifted from the combustion tank 3, the valve port 4
is not blocked and causes oil leakage.

Also, connect the fuel filler cap 2 to the tank 1 as shown in Figure 2.
If it is removed from the cartridge and placed horizontally, oil 10 will remain inside the silencer cylinder 5 even though the oil flow parts 6, 6 are provided in two places on the left and right sides, and when it is next attached to the oil filler port of the cartridge tank 1, it may be accidentally There was a risk that oil would spill out. Furthermore, the above-mentioned muffling cylinder 5 is produced by forming a cylinder by drawing, and then drilling an oil flow part 6 such as a hole therein, so the manufacturing process is complicated, the processing process is time-consuming, and the cost is high. There was a drawback.

<Purpose> The present invention was made in order to eliminate all of the above-mentioned drawbacks. The oil flow section is provided at each corner of the cylinder, and the circular valve is substantially inscribed in the triangular cylinder.

<Example> An example of the present invention will be described below with reference to the drawings.

FIG. 3 is a sectional view of the fuel filler cap of the present invention, in which reference numeral 11 indicates a small tolerance at the lower end of a cylindrical body with an upper end opening, and a screw 12 is provided on the circumferential surface thereof, and a support seat 14 of a packing 13 is provided. The oil filler cap body is formed by fitting a lid 16 having a valve port 15 on the upper end face thereof, and is screwed into the oil filler port of a cartridge tank using the threaded portion 12.

Reference numeral 17 is a triangular noise-muffling cylinder with a bottom as shown in FIG. 4, and small holes 19, 19, . Oil circulation part 20 with holes, gaps, etc. below
a, 20a... are formed, and its mounting piece 2
1, . . . are spot welded to the inner surface of the lid 16. Note that 22 is a spot welding jig contact piece.

Reference numeral 23 denotes a valve for opening and closing the valve port 15 formed in the lid 16, and the lower end thereof is inserted and attached to the valve rod 26 which is inserted and supported through the valve rod support hole 25 formed in the bottom portion 24 of the muffling cylinder. It is energized by a spring 27 so as to close the valve port 15 at all times. 28 is an O-ring fitted around the valve 23, and 29 is a packing holding frame.

The muffling tube 17 shown in FIG. 4 is made by punching a flat plate into the shape shown in FIG. Bend each side wall 1
A rectangular tube is formed such that the adjacent sides 31, 31 of the tubes 8, 18, . . . contact each other. Therefore, there is a slight gap 32, 32... between the side walls 18 of the muffling cylinder 17, but in reality the maximum is 0.5 mm.
Considering the viscosity of oil, the pressure inside the cartridge tank, etc., it is the same as if they were in close contact with each other, and no air leaks from this gap 32.

As shown in FIG. 5, the end portion of the side wall 18 forms a width detail 34 via step portions 33, 33, and this width detail 34 is extended as it is to form the mounting piece 21, so the side walls 18, 18 Adjacent side 3 of
When 1, 31... are brought into contact with each other as shown in FIG. 4, a gap is formed only at the bottom of each corner 20, 20, and this becomes the oil flow section 20a. The gap between the flow passage portions 20a is, for example, about 2 to 3 mm, which is slightly larger than the diameter of the air outflow holes 19, 19, which is about 1 mm.

The valve support hole 25, the small hole 19, the width detail 34, etc. are formed at the same time as the plate material shown in FIG. 4 is punched out from the flat plate, so there is no need for special processing.

FIG. 6 is a schematic view showing the positional relationship between the muffling cylinder and the valve 23, in which the outer periphery of the cylindrical valve 23 is inscribed in each side wall 18 of the triangular muffling cylinder 17. With such a configuration, the valve 23 is connected to the side wall 1 of the muffling tube 17.
Although it moves up and down along line 8, it does not swing left or right. Further, since a large space 35 is formed at the corner portion 20 between the valve 23 and the muffling cylinder 17, the air that has entered to replace the oil can be moved above the muffling cylinder 17. Note that FIG. 3 is a sectional view taken along line A-A'.

Furthermore, when the oil filler cap is turned over as shown in FIG. 7, at least one of its flow portions 20a is always located at the lowest position, so that the oil inside the muffling tube 17 is reliably drained out of the muffling tube 17.

If the muffler cylinder 17 is made into a triangular cylinder in this way, the valve 2
Even when the side walls 18, 18, 18 of the muffling tube 17 are circumscribed by the valve 23 and the muffling tube 17, a large space is created between the valve 23 and the muffling tube 17, so that the incoming air is transferred to the muffling tube 17.
can be smoothly moved to the upper side, and the effect of providing the muffling tube 17 can be further enhanced.

<Effects> As described above, according to the present invention, even if the outer periphery of the valve is placed almost close to the three side walls of the muffler, the three side walls of the muffler
Since there is a large space in the corner on both sides, it is possible to not only eliminate the vibration of the valve relative to the valve opening, but also to allow the air that has flowed in to replace the oil to move smoothly above the muffling cylinder, thereby reducing the sound of the muffling cylinder. Facilitate the effect.

In addition, since the silencer cylinder is formed into a triangular cylinder and the oil circulation part is provided at the corner of the cylinder, if the oil filler cap is turned over, at least one of the oil circulation parts will always be located at the lowest position, so there will be no damage inside the silencer cylinder. The oil will surely drain out of the muffler and will not remain inside the muffler.

Furthermore, the above-mentioned sound-muffling cylinder can be formed by simply punching out a flat plate and bending it, making it extremely easy to manufacture and thus reducing costs.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional oil filler cap, Figure 2
The figure is an explanatory view for explaining its operation, Figure 3 is a sectional view of the fuel filler cap of the present invention, Figures 4 and 5 are perspective views and developed views of the silencer tube used in the present invention,
FIG. 6 is an explanatory diagram for explaining the structure of the fuel filler cap of the present invention, and FIG. 7 is an explanatory diagram for explaining the operation of the present invention. Code, 15... Valve port, 17... Silencer cylinder, 23...
...Valve, 19...Small hole, 20a...Oil distribution section.

Claims (1)

[Scope of Claim for Utility Model Registration] A fuel filler cap installed at the fuel filler port of a cartridge type tank, in which a bottomed cylindrical sound-muffling cylinder is provided covering the valve port, and an oil flow part is provided on the valve port side of the muffler. In addition, an air outlet is provided on the bottom side, and a valve rod support hole is provided at the bottom of the muffling cylinder, one end of which is inserted and supported, and the other end is fitted with a spring to constantly close the valve port. A fuel filler cap is provided with a valve rod to which a circular valve energized is attached, and the valve opening is opened and closed by the vertical movement of the valve. A nearly sealed or triangular tube with a bottom is formed by processing, and the oil flow portion is provided at each corner of the triangular tube, and the circular valve is substantially inscribed in the triangular tube. A fuel filler cap featuring