JPS6220106B2 - - 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]

First, the structure of a conventional oil filler cap A will be explained based on FIG. In the figure, reference numeral 1 denotes a lid 6 which has a small diameter at the upper end of a cylindrical body with an opening at the upper end, has a screw 2 on the same side thereof, forms a support seat 4 for the packing 3, and has a valve port 5 on the lower end surface. It is a fuel filler cap main body formed by fitting a fuel filler cap body, and is screwed into the fuel filler port 8 of the cartridge tank 7 with the screw portion 2.

Reference numeral 9 denotes a cylindrical silencer with a bottom provided on the inner surface of the lid 6 so as to cover the valve port 5. Reference numeral 10 denotes a valve for opening and closing the valve port 5, the upper end of which is inserted and attached to a valve rod 13 which is supported through a valve rod support hole 12 formed in the bottom part 11 of the muffling cylinder, and is always supported by a spring 14. Benguchi 5
is energized to block it. When the cartridge tank 7 is set in the combustion tank 15, the valve 10 is pushed up by a projecting pin 16 provided on the tank 15 to open the valve port 5. Above valve 1
0 moves up and down each time the cartridge tank 7 is attached to or removed from the combustion tank 15, so if the play between the valve rod 13 and the valve rod support hole 12 is too large, the valve 10 will swing relative to the valve port 5. Therefore, the valve port 5 will not be completely closed, causing oil leakage. Therefore, the valve rod 13 is inserted into the valve rod support hole 12 with almost no play. Therefore, almost no air leaks from the support hole 12.

The above-mentioned silencer tube 9 is provided to reduce the noise generated when oil flows from the cartridge tank 7 to the combustion tank 15 through the oil filler cap A during combustion in the oil stove. Only a portion 17 is bored and a small hole 18 for air outflow is provided in the upper part. The small holes 18, 18, . . . function to reduce the sound of the air that has flowed into the muffler cylinder 9 instead of the oil and that has escaped into the cartridge tank 7 by turning it into small bubbles.

[Problem that the invention seeks to solve]

The oil filler cap A as described above reduces the sound when oil spills, but the silencer cylinder 9 has a valve lever support hole 12.
In addition to the oil outflow portion 17, a small hole 18 for sound deadening must be separately provided to allow the air that has flowed into the sound deadening cylinder 9 to replace the oil to escape into the cartridge tank 7 as small bubbles. Ta.

Therefore, the problem to be solved by the present invention is to obtain a fuel filler cap that can achieve the purpose of noise reduction without separately providing a small hole 18 exclusively for noise reduction in the noise reduction tube.

[Means for solving problems]

This will be explained using FIG. 2 and FIG. 3 corresponding to the embodiment.

The muffling tube 9 is shaped like a rectangular tube with a bottom, and an oil flow section 17a is provided on the valve port side of the muffling tube 9.
A valve lever support hole 20 is provided in the bottom portion 11 of the valve lever.

A guide holding portion that guides and holds the valve rod 13 in contact with the valve rod 13 (if the shape of the valve rod support hole 20 is polygonal, each side corresponds to the same); It has a shape consisting of an air outflow portion (if the shape of the valve rod support hole 20 is polygonal, the corner portion 21 corresponds to the shape) which is spaced apart from the valve rod 13 and forms an air outflow space.

In addition, in FIGS. 4 to 6, 26 is a guide holding part, and 27 is a flowing air outlet part.

Further, a circular valve is provided, in which the valve rod 13 is inserted and supported in the valve rod support hole 20 and is energized by a spring so as to constantly close the valve port. Almost inscribed in each side piece.

[Effect]

The air flowing in from the valve port flows into the corner part 2 of the muffling cylinder 9.
5, 25, and 25 to the upper part of the muffling cylinder and accumulates inside the bottom part 11. Since the valve is inscribed in the side piece of the muffling cylinder 9, no vibration occurs when it moves up and down.

The accumulated air flows upward into the cartridge tank from the air outflow part of the valve lever support hole 20 (21 in Fig. 3, 27 in Figs. 4 to 6) as fine bubbles, so the sound is extremely loud. small. Note that the oil that flows out in place of the inflowing air flows out from the oil outflow portion 17a of the muffling cylinder 9.

Therefore, the valve rod support hole 20 can also be used as an air outflow hole.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings, and the structure of the fuel filler cap is simply that the silencer tube 9 in FIG. 1 is replaced with the silencer tube 9a in FIG. 2. Therefore, the structure and explanation other than those relating to the muffling cylinder 9a refer to those in FIG. 1.

FIG. 2 is an external perspective view of the muffler 9a used in the present invention, and FIG. 3 is an explanatory diagram showing the relationship between the valve lever and the valve lever support hole. In FIG. 2, a triangular silencer cylinder 9a with a bottom has an equilateral triangular bottom part 11, three rectangular side pieces 23 provided along each side of the bottom part 11,
A flat plate punched into a shape having 23, 23 is inserted into each side piece 2 from each side of the bottom part 11.
The mounting pieces 24, 24 are formed by bending the side pieces 23, 23, 23 at almost right angles in the same direction by bending so that the mutually adjacent sides of the side pieces 23, 23, 23 are in contact with each other. , 24 are spot welded to the inner surface of the lid 6. The oil flow portion 17a is formed at the lower end of each corner portion 25, 25, 25 of the triangular tube.

When such a silence cylinder 9a is used, even if the outer circumference of the cylindrical valve 10 is inscribed in each side 23, 23, 23, a large gap is created between the valve 10 and each corner portion 25, 25, 25. Therefore, the air flowing into the muffling tube 9a can move upward without being obstructed by the valve 10, and the valve 10 does not swing relative to the valve port 5. The valve rod 13 forms a cylinder like the conventional one, but the valve rod support hole 2
0 has an equilateral triangular shape as shown in FIG. 3, and the outer periphery of the valve rod 13 is inscribed in the valve rod support hole 20.
That is, each side of the valve rod support hole 20 serves as a guiding and holding portion that guides and holds the valve rod 13, and each corner portion 21 serves as an air outflow portion that forms an air outflow space between it and the valve rod 13. .

Reference numeral 22 denotes a holding portion for the spring 14 that bulges upward from the bottom portion 11, and the inside thereof serves as an air reservoir.

When using the muffling tube 9a shown in FIGS. 2 and 3, air flowing in from the valve port 5 moves upward through the corner portions 25, 25, 25 of the muffling tube 9a, and accumulates inside the bottom portion 11. Since this accumulated air can only move upward through the corner portions 21, 21, 21 of the valve lever support hole 20, it flows upward from the corner portions 21 into the cartridge tank in the form of fine bubbles. In other words, they play the same role as the conventional small holes 18, 18. Therefore, the noise generated during an oil spill is very low.

The above-mentioned silencer cylinder 9a can guide the valve rod 13 with almost no play, and the valve rod support hole 20 can also be used for air venting, so it is not necessary to take the trouble to drill small holes 18, 18 for air venting as in the conventional case. This simplifies the manufacturing process.

[Other Examples]

(1) In FIG. 4, the shape of the valve rod support hole 20 is approximately Y-shaped.

(2) In FIG. 5, the diameter of the valve rod support hole 20 is made considerably larger than the diameter of the valve rod 13 to provide some play. In this case, the valve 10 includes the sides 23 of the muffling cylinder 9,
23, 23, the valve 10 does not swing relative to the valve port 5.

(3) Figures 6a, b, and c show examples in which the valve rod support hole 20 is circular and the cross-sectional shape of the valve rod 13 is modified.

In addition, in Fig. 4 and Fig. 6 a, b, and c,
26 is a guide holding part, and 27 is an air outflow part.
In addition, in FIG. 5, the valve rod 1 of the valve rod support hole 20 is
The portion in contact with 3 is the guide holding portion 26, and the other portion is the air outflow portion 27.

〔effect〕

As described above, according to the present invention, the muffling tube is formed into a rectangular tube shape with a bottom, and a circular valve is substantially inscribed in each side piece of the muffling tube. It is possible to guide the valve so that it does not swing relative to the valve port while ensuring the corner portion of the valve, and it is also possible to provide play between the valve rod support hole and the valve rod.

Therefore, the valve rod support hole can be made into a shape consisting of a guide holding part and an air outflow part, and can also be used as an air outflow hole. This has the remarkable effect that there is no need to provide holes.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing how a cartridge tank using a conventional fuel filler cap is used, Fig. 2 is a perspective view of the appearance of a silencer tube used in the fuel filler cap of the present invention, and Fig. 3 is a valve rod and valve. FIGS. 4 and 5 are plan views showing the relationship between the rod support holes, and FIGS. 4 and 5 are plan views of main parts of other embodiments of the muffler, respectively. FIGS. 6 a, b, and c are diagrams showing the valve rod and valve of other embodiments. It is an explanatory view showing the shape of a rod support hole. Symbol, 9a...muffling tube, 13...valve lever, 20...valve lever support hole.

Claims (1)

[Scope of Claims] 1. In a fuel filler cap provided at the fuel filler port of a cartridge tank that is set in a combustion tank to supply oil, a sound deadening tube in the shape of a rectangular cylinder with a bottom is provided covering the valve port, and the sound deadening tube is An oil circulation part is provided on the valve port side, and a valve rod support hole is provided at the bottom of the muffling cylinder, and one end of the valve rod is inserted into and supported by the hole, and the other end is equipped with a spring to constantly close the valve port. A valve lever is provided by attaching an energized circular valve, and the valve lever support hole is spaced apart from the guide holding portion that guides and holds the valve lever in contact with the valve lever. and an air outflow portion forming an air outflow space, and the circular valve is substantially inscribed in each side piece of the muffling tube. 2. The fuel filler cap according to claim 1, wherein the muffling tube has a substantially equilateral triangular tube shape. 3. The fuel filler cap according to claim 1 or 2, wherein the valve lever support hole has a substantially equilateral triangle shape, and the valve lever has a cylindrical shape inscribed in the valve lever support hole.