JPS5931969Y2 - gaskotok - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a gas cock that switches gas flow paths in response to gases having different calorific values per unit volume.

PRIOR ART In a gas cock using a conventional closure, when using city gas such as 13A gas, which has a large calorific value per unit volume, the circular unit volume of city gas is as shown in Figure 1. Compared to, for example, 6B gas, which has a small calorific value per unit, it was difficult to adjust the flow rate.

This is because when adjusting the flow rate below the nozzle limit, for example, 6B gas and 13B gas have different internal resistances even at the same closing angle, and 6B gas has a wide adjustment range (approximately 50 degrees).
), narrow (approximately 30°) for 13A gas.

For this reason, when the same gas cock is converted from 6B gas to 13A gas, the adjustment range is different, which is very inconvenient when using 13A gas with low heat.

In order to eliminate this inconvenience, a gas cock as shown in FIG. 4 has been proposed.

That is, as shown in FIG. 4, a conical closure 12 is inserted into the gas casing 11, biased by a spring 22 to maintain airtightness, and the flow rate is adjusted by rotating the rotating shaft 13. It forms a normal gas cock.

In this gas cock, the closure 12 is provided with a center hole 15 that communicates with the delivery hole 14, and the gas housing 11 is provided with a gas supply pipe 16 for city gas, a hole 17 and an LP port.
A gas supply hole 18 for gas is provided.

The above-mentioned closure 12 further has a gas hole 19 for city gas and a gas hole 2 for LP gas that communicate with the gas supply hole 17.18.
0 is provided.

The gas supply holes 17 and 18 have a diameter of 60 mm with respect to the circumference of the closure 12.
It is a hole with the same diameter as the gas hole 9 with a diameter corresponding to LP
A narrow groove is provided in the gas hole 20 portion in the horizontal direction with respect to the closure 12.

Reference numeral 21 denotes a spherical valve which is inserted from the supply pipe 16 and has the function of closing gas inflow to the gas supply hole 17 side.

When using city gas with the above gas cock,
It is used without the valve 21.

In this case, the amount of gas passing through city gas and LP gas is approximately 6 times larger in terms of area, so when city gas is used,
There is no problem even if the gas supply hole for LP gas is open.

When using LP gas, close the gas passage on the side of the gas supply hole 17 for city gas with the valve 21.
The gas flows in the direction of the gas supply hole 18 for LP gas.

In this case, since the effective gas passage area is small, the amount of gas changes sequentially with respect to the rotation angle of the cock, making it possible to adjust the combustion amount to the same level.

However, with such a gas cock, when switching the gas passage, the spherical valve 21 must be inserted from the gas supply pipe 16 as described above, and the gas cock must be removed from the gas pipe for this purpose, making the switching work very inconvenient. there were.

Purpose The present invention was developed in order to eliminate the above-mentioned drawbacks.A valve for opening and closing the center hole of the closure is provided in the center hole, and the valve shaft is inserted through the operation shaft of the closure to extend the valve outward. The valve is controlled by operating the valve shaft from the outside and the gas flow path can be switched, simplifying the task of switching the gas flow path. .

Example Next, embodiments of the present invention will be described based on the drawings.

FIG. 2 is a cross-sectional view of a gas cock showing an embodiment of the present invention.

In the figure, 1 is the gas cock body, 2 is the closure, and 2a is its operating shaft that protrudes outside the main body 1.

Reference numeral 2b denotes a central hole bored in the center of the inside of the closure 2, and a stepped portion 2C is formed in the center.

3 is a valve installed in the center of the center hole 2b, and O
A ring 4 is fitted, and its valve shaft 3a is inserted into the operating shaft 2a and protrudes outward.

5 is a spring that presses the closure 2, and the closure cover 6
Together with this, the closure 2 is fixed.

7 is a spring of the valve 3, which presses the valve 3 onto the stepped portion 2C.

8 is an O-ring, and 9 is a holding piece for the spring 7.

A blind metal fitting 10 is screwed onto the end of the operating shaft 2a, and abuts against the valve shaft 3a to position it.

Supply ports A and B are provided on one side of the gas cock body 1, and the supply port A has a larger cross-sectional area than the supply port B.

The outlet C is open in the lower part of the gas cock body 1.

Note that FIG. 2 shows a state in which the supply port A and the outlet C are not in communication with each other due to the O-ring 4 of the valve 3, and the passage of the supply port B is open to the outlet C.

Therefore, gas is supplied only through passages with a narrow cross-sectional area, which indicates the use of 13A gas.

When the closure 2 is rotated in the closing direction in this state, the gas amount changes gradually, and a gas consumption characteristic diagram with respect to the rotation angle of the closure as shown in FIG. 3 is obtained.

Next, when using 6B gas, twist the blind metal fitting 10 and push it down in the direction of the outlet C. This will push down the valve and create a gap near the O-ring 4, allowing the 6B gas to flow into the supply port A.
, passage A, supply port B, and passage A to reach outlet C.

When the closing member 2 is rotated in the closing direction, the flow rate of the gas exhibits almost the same characteristics as the 13A gas, as shown in FIG.

In addition, in the case of 6B gas, supply port A, passage a and supply port B,
Although both of the passages are used, as mentioned above, the cross-sectional area of the sixth passage is smaller than that of the third passage, so the amount of gas passing through the sixth passage can be ignored.

As explained above, the present invention rotatably inserts and inserts a closure having an operating shaft into a gas cock body having a gas outlet hole.
Closing holes are formed in the upper and lower sides of the above-mentioned closing body, and a center hole is provided to communicate these closing holes with the gas outlet hole of the gas cock body. In a gas cock provided with corresponding gas supply holes, at least one of the closed hole farther from the operating shaft and the corresponding gas supply hole is connected to the closed hole closer to the operating shaft and the corresponding gas supply hole. A stepped portion is formed on the inner wall between the upper and lower closing holes of the center hole which communicates the upper and lower closing holes with a diameter smaller than either diameter of the supply hole. A valve that opens and closes the hole at this step is installed inside the center hole so as to be able to slide back and forth, and this valve shaft is inserted through the operating shaft and extends outward, and the valve shaft is used to operate the valve. The gas flow path is switched by sliding the valve back and forth to open or close the center hole at the step, so the valve shaft can be operated from an easily accessible part such as the insertion shaft. The center hole is opened and closed by a valve, and when the center hole is closed, it can be used as a gas flow path suitable for gas with a large calorific value per unit volume, and conversely, when the center hole is opened The gas flow path can be suitable for gas having a small calorific value per unit volume.

Therefore, it is much easier to switch the gas flow path depending on the type of gas than before, and it is also easy to make minute adjustments to the flow rate even for gases that have a large calorific value per unit volume, such as 13A gas. We can provide gas cocks with high practical value.

In addition, even when repairing the gas flow switching part or replacing parts, all you have to do is remove the closure from the gas cock body.
Workability is significantly improved compared to conventional systems in which the gas flow switching section cannot be repaired or parts replaced without removing the gas cock itself.

[Brief explanation of drawings]

Fig. 1 is a gas flow characteristic diagram when a conventional gas cock is used, Fig. 2 is a cross-sectional view showing an embodiment of the present invention, Fig. 3 is a gas flow characteristic diagram using a gas cock according to an embodiment of the present invention, and Fig. 4 is a gas flow characteristic diagram when a conventional gas cock is used. The figure is a side sectional view of a conventional gas cock, where 1 is the gas cock body, 2 is the closure, 3 is the valve, A and B are the supply ports, and C is the outlet.

Claims (1)

[Scope of Claim for Utility Model Registration] A closure having an operating shaft is rotatably fitted into a gas cock body having a gas outlet hole, and closure holes are formed at the top and bottom of the sides of the closure, respectively, and these closures are provided. A gas cock is provided with a center hole that communicates the slave hole with the gas outlet hole of the gas cock body, and the gas cock body is further provided with gas supply holes corresponding to each of the closing holes. At least one of the secondary hole and the corresponding gas supply hole is made to have a smaller diameter than either of the closed hole and the corresponding gas supply hole on the side closer to the operating shaft, and A step is formed on the inner wall between the upper and lower obturator holes of the central hole that communicates the obturator holes, and a valve that opens and closes the center hole is inserted back and forth into the center hole. The interior of the valve is slidable, and the valve shaft of this valve is inserted through the operating shaft and extends outward. lhL Koue 0 Tribute? The gas cock is configured to switch the gas flow path by sliding the roof of the roof to open or close the center hole at the step.