JP2000179834A - Gas cock device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform an easy and fine regulation of a gas supply amount in a minimum throttling state in a gas cock device for opening a safety valve by pressing the valve by a rod by axially moving a cam plunger cooperatively with a rotation of the shaft to axially move the rod extended in the axial direction when the shaft supported to a gas cock body is rotated. SOLUTION: A needle valve B for regulating a gas supply amount to regulate a passing gas amount is mounted at an interval of an advancingly or retractably movable needle valve disc 6 and a valve seat 5b to the seat 5b formed in a gas passage 50. A cam 8 rotating cooperatively with an operating shaft 13 is rotatably mounted at a gas cock body 1, and a cam surface 8b spirally extended to the cam 8 is formed, engaged with a bar 6b of the disc 6. When the cam 8 is rotated, the disc 6 is advancingly or retractably moved to regulate the gas supply amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas cock device used for a gas appliance such as a gas table.

[0002]

2. Description of the Related Art Conventionally, in a gas cock device of this type, when an operation shaft is rotated around an axis by an operation knob, a rod extending in an axial direction moves in an axial direction in conjunction with the rotation, and a safety valve and a main valve are moved. On the other hand, the closing member which is pushed open and rotates in conjunction with the operation shaft slides along the opening end surface of the gas outlet to change the opening area of the gas outlet, and the supply amount of gas to the burner is adjusted. (Japanese Patent Application No. 9-2484)
No. 34). In this device, when the operation knob is rotated in a state where the main valve is opened, the closing member rotates to change the opening area of the gas outlet, thereby adjusting the gas supply amount. When extinguishing a fire, the operation knob is continuously rotated in a direction in which the opening area becomes smaller. Then, the opening of the gas outlet is completely closed by the closer, the main valve is closed, and the fire goes out.

[0003]

However, in such a configuration, when the gas supply amount is adjusted to the minimum throttle state, the operation knob may be rotated too much to reduce the opening area and extinguish the fire. It is difficult to finely adjust the gas supply amount in the minimum throttle state. Further, the outer periphery of the closing member is rotatably slidably contacted with the gas cock main body or the like in an airtight state, and it becomes difficult to rotate during long use, and it becomes difficult to finely adjust the gas supply amount.

[0004] It is an object of the present invention to provide a gas cock device in which fine adjustment of a gas supply amount in a minimum throttle state is easy.

[0005]

According to the present invention, in order to solve this problem, when an operation shaft supported by a gas cock main body is rotated, a cam plunger in the gas cock main body is interlocked with the rotation of the operation shaft. In a gas cock device in which a rod that moves in the axial direction and extends in the axial direction in conjunction with the movement of the cam plunger moves in the axial direction, and the safety valve that has been pressed by the rod to close the gas passage opens, A rotating body that is attached to a needle valve body that can move forward and backward with respect to a valve seat formed at the valve seat and that adjusts a gas supply amount at a distance between the valve seat and a needle valve for adjusting a gas supply amount, and that rotates in conjunction with an operation shaft. Is rotatably mounted on the gas cock main body, and a helically extending cam surface is formed on the rotating body and engages with the needle valve body. When the rotating body rotates, the needle valve body moves forward and backward to supply the gas supply amount. Characterized in that it is adjusted.

Since the closure rotates in conjunction with the operation shaft, it is not possible to stop only the rotation of the closure and rotate only the operation shaft when the closure reaches the minimum throttle position.
In the present invention, by appropriately forming the cam surface, only the operation shaft can be rotated while the needle valve is stopped at the minimum throttle state, and when the gas supply amount is reduced, the needle valve is excessively throttled. The fire can be prevented from going out. Therefore, fine adjustment of the gas supply amount in the minimum throttle state is easy. Further, since the needle valve moves forward and backward instead of rotating, the sliding surface hardly hits one side, and smooth sliding is ensured.

By the way, the cam plunger is engaged so as to rotate in conjunction with the operation shaft, and the rotating body is
If the cam plunger is engaged with the cam plunger to rotate, the rotating body engaging with the cam plunger prevents the cam plunger from leading in the rotational direction, and the cam plunger rotating in conjunction with the operating shaft. Becomes stable.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a gas cock main body formed by, for example, aluminum die-casting, and has a hollow portion 1a formed therein and a gas inlet for flowing gas into the hollow portion 1a. 1b and a gas outlet 1c through which gas flows from the hollow portion 1a to a burner (not shown). The hollow portion 1a is provided with a rod 2 extending in the left-right direction of FIG. 1 and movable in the direction, and an electromagnetic safety valve 3 mounted in the hollow portion 1a from the right end. Although the safety valve 3 shown in FIG. 1 is in a closed state and gas does not flow downstream of the safety valve 3, gas flows downstream when the rod 2 moves rightward and pushes the safety valve 3 to open. A main valve 2a is provided in the middle of the rod 2, and the rod 2 is urged leftward by a spring 4 inserted between the main valve 2a and the valve seat member 3a. The main valve 2a shown in FIG. 1 is in a closed state pressed against the valve seat 1d, and the gas does not flow downstream of the main valve 2a, but the gas flows downstream when the rod 2 moves rightward to open the valve. .

A needle body 5 is mounted above the gas cock body 1 in FIG. In the needle body 5, a gas passage 50 communicating with the gas outlet 1c of the gas cock body 1 and a through hole 51 extending in the left-right direction communicating with the gas passage 50 are formed. A needle valve body 6 described later is inserted into the through hole 51 from the left end opening 51a. The gas sent from the gas outlet 1c to the needle body 5 passes through the gas passage 50 and flows through the gas flow at the right end of the needle body 5 through the gas passage 50. Exit 5
a to a burner (not shown).

The needle body 5 is provided with a needle valve B. The needle valve B is composed of a valve seat 5b, which is a throttle portion formed in the middle of the gas through hole 50, and a needle valve body 6 which can move forward and backward with respect to the valve seat 5b.
The amount of passing gas is adjusted by the distance between b and the needle valve 6. The needle valve element 6 is inserted into the through hole 51 so as to be movable in the left-right direction along the through hole 51 and is urged rightward by a spring 7. When the needle valve body 6 is pressed against the valve seat 5b and the needle valve B is closed, the gas of the minimum flow rate determined by the orifice passage 6c flows to the gas outlet 5a downstream of the needle valve body 6 and the needle valve body 6
Is separated from the valve seat 5b to adjust the valve opening, thereby adjusting the gas supply amount to the burner. The needle valve element 6 is provided with a sealing O-ring 6a.

As described above, since the state in which the needle valve B is closed is the minimum throttle state, it is possible to prevent the fire from extinguishing due to the needle valve body being too narrow, and to reduce the gas supply amount in the minimum throttle state. Fine adjustment is easy. Further, since the gas supply amount in the minimum throttle state can be set by the size of the diameter of the orifice 6c, the gas supply amount in this state is stabilized. Since the needle valve element 6 moves forward and backward instead of rotating, it is easy to ensure smooth movement in an airtight state.

A cam 8, which is a substantially cylindrical rotating body inserted from the left end opening of the gas cock main body 1, and a cam guide 9 are mounted in the hollow portion 1 a of the gas cock main body 1. The cam guide 9 is pressed against a step 1e in the hollow portion 1a by a base plate 10 attached to the left end of the gas cock main body 1. As shown in FIG. 2, a projection 9a is formed on the peripheral side of the cam guide 9, and is engaged with a concave groove 1f formed on the inner surface of the hollow portion 1a.
Therefore, the cam guide 9 is fixed to the gas cock main body 1.

The cam 8 is accommodated in the gas cock main body 1 in a rotatable state in a state in which the movement in the left-right direction is restricted by the cam guide 9. A pair of grooves 8a extending in the axial direction, that is, in the left-right direction is formed on the outer periphery of the cam 8. In the cylinder of the cam 8, one engaging with the groove 8 a is provided.
A cam plunger 11 having a pair of convex portions 11a on its outer periphery is inserted. Therefore, when the cam plunger 11 rotates, the cam 8 rotates in conjunction therewith. Also, cam plunger 1
1 is movable in the left-right direction with respect to the cam 8. The right end of the cam plunger 11 is closed, and pushes the rod 2 rightward when it moves rightward. Note that a wavy pressing ring 12 is interposed on the right side of the cam 8, and the cam 8 does not move to the right even if the cam plunger 11 moves to the right. The holding ring 12 gives the cam 8 a rotational resistance,
By changing the shape and the like of the holding ring 12, the rotation resistance can be adjusted, and the rotation operability of the operation knob can be appropriately adjusted.

An operation shaft 13 having a left-right direction as an axial direction is loosely fitted to the cam plunger 11. The operation shaft 13 is supported by a base plate 10 and a gate-shaped guide plate 14 attached to the gas cock main body 1 from the left side thereof, and a flange 13a is formed in the middle. Between the flange 13a and the base plate 10, a cam plate 15 having two fan-shaped portions for turning on and off a switch such as a discharge switch (not shown) is non-rotatably mounted. Cam plate 15 and base plate 10
And a spring 16 is interposed therebetween, and the spring 16 urges the operation shaft 13 and the cam plate 15 to the left. A claw portion 13b is formed on the left surface of the flange 13a. Claw part 1
3b engages with the notch 14a of the guide plate 14 in the valve closed state shown in FIG. 1 to prevent the operation shaft 13 from rotating. As shown in FIG. 3, the operation shaft 13 is rotatable when pushed to the right against the urging force of the spring 16. An operation knob 17 is attached to the operation shaft 13.

The right end of the operating shaft 13 has a groove 1 extending in the radial direction.
3c is formed. The pin 18 is inserted in the groove 13c in an intersecting state, and when the operation shaft 13 is rotated, the pin 18 rotates in conjunction with the rotation. The pin 18 is engaged with the groove cam 9 b formed in the cylindrical portion of the cam guide 9 and the engagement groove 100 of the cam plunger 11. The groove cam 9b extends in the spiral direction of the so-called left-hand thread. Therefore, when the operation shaft 13 is rotated leftward L (see FIG. 2), the pin 18 is moved rightward by the groove cam 9b while rotating leftward. The engagement groove 100 has a wide portion 101 on the left side (see FIG. 2), a narrow portion 102 on the right bottom side (see FIGS. 2 and 3), and a slope 103 therebetween (see FIGS. 2 and 3). When the operating shaft 13 is rotated leftward L and the pin 18 is rotated, the rotating pin 18 presses an appropriate portion of the engagement groove 100, and the cam plunger 11 rotates in conjunction therewith. Move to the right.

A cam surface 8b is formed on the outer periphery of the cam 8 so as to extend in the spiral direction of a so-called left-hand thread. The cam surface 8b is engaged with a downwardly extending bar 6b attached to the needle valve body 6. Therefore, when the cam 8 rotates leftward L, the bar 6b is pushed leftward while sliding on the cam surface 8b, and the needle valve body 6 moves leftward against the urging force of the spring 7. When the cam 8 rotates clockwise, the bar 6b and the cam surface 8b are kept in sliding contact with each other.
Moves rightward by the urging force of the spring 7. That is, the needle valve element 6 moves forward and backward with respect to the valve seat 5b in the gas passage 50 in conjunction with the rotation of the cam 8, and the valve opening determined by the distance from the valve seat 5b is adjusted to adjust the gas supply amount. Is done. By changing the shape of the cam surface 8b, it is possible to easily set the gas supply amount when the needle valve element 6 is fully opened and the opening degree of the needle valve element 6 with respect to the rotation angle of the operation shaft 13.

The operation of the gas cock device having such a configuration will be described. In the ignition operation for starting the combustion in the burner, first, the operation knob 17 is pushed rightward from the valve closed state shown in FIG. 1 to remove the claw portion 13b from the notch 14a, and the operation shaft 13 is made rotatable. The operation knob 11 is rotated left (L in FIG. 2) toward the gas cock device. Then, the operation shaft 13 and the pin 18 rotate left. The pin 18 moves rightward along the groove cam 9b of the cam guide 9 while rotating left.
At this time, the pin 18 comes into contact with both the wide portion 101 and the inclined surface 103 of the engaging groove 100 to move the cam plunger 11 rightward while rotating the cam plunger 11 leftward, and in conjunction with this, the cam 8 rotates leftward.

When the operating shaft 13 is rotated counterclockwise until the turning state shown in FIG. 3 is reached, the rod 2 is pushed rightward by the cam plunger 11 moved rightward, and the main valve 2a is fully opened. Further, the safety valve 3 is opened by being pushed by the rod 2, and the cam surface 8b of the cam 8 which has been rotated to the left pushes the bar 6b of the needle valve body 6 to the left to open the needle valve body 6 to a full open state. A considerable amount of gas is supplied to the burner via the gas passage 50.

The cam plate 15 rotates to turn on a discharge switch (not shown), and the burner is ignited to heat a thermocouple (not shown) disposed near the burner. Until the safety valve 3 is opened and held by the thermoelectromotive force generated by the thermocouple, the operation knob 17 continues to apply a left-turning force to the operation shaft 13.

When the leftward rotation force is released after the safety valve 3 is held open, the claw portion 13b of the operation shaft 13 abuts on the guide plate 14 as shown in FIG. 4, and the gas cock device is shown in FIG. The valve is opened. In this state, the claw portion 13b does not coincide with the notch 14a, the operation shaft 13 is maintained in a rotatable state, and the main valve 2a is maintained in an open state. Further, the cam plunger 11 is pushed leftward by the rod 2, and the pin 18 is engaged with the narrow portion 102 of the engagement groove 100. When the operation knob 17 is rotated in this state,
Operation shaft 13, pin 18, cam plunger 11, and cam 8
Is rotated, and the bar 6 of the needle valve element 6 is moved by the cam surface 8b.
b is moved in the left-right direction, and the valve opening of the needle valve body 6 is adjusted.

When the operation shaft 13 is continuously rotated clockwise from the state shown in FIG. 4, the needle valve body 6 is pushed rightward by the spring 7 so that the valve opening gradually decreases, and the closing force is pressed against the valve seat 5b. State. The closed state is the minimum aperture state,
A minimal flow of gas is supplied to the burner. By the way, the cam surface 8b is engaged only in the direction to move the bar 6b of the needle valve body 6 to the left, and only the operation shaft 13 is further rotated clockwise while the movement of the needle valve body 6 is stopped. Can be. Therefore, when only the operation shaft 13 is rotated clockwise from this state, the claw portion 13b of the operation shaft 13 finally matches the notch 14a. Then, the operating shaft 13 is pushed to the left by the spring 16, the claw portion 13b is fitted into the notch 14a, and the operating shaft 13 moves to the position shown in FIG.
Closes the valve seat 1d, closes the valve, stops the gas supply to the burner, and extinguishes the fire. When the burner extinguishes, the thermoelectromotive force generated by the thermocouple decreases, the safety valve 3 cannot be kept open, the valve closes, and the entire gas cock device returns to the closed state shown in FIG.

[0022]

As described above, according to the present invention, it is possible to easily adjust the setting of the gas supply amount.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a gas cock device in a valve closed state to which the present invention is applied.

FIG. 2 is an exploded view showing a configuration of a main part of the gas cock device.

FIG. 3 is a sectional view showing the gas cock device in a fully turned state.

FIG. 4 is a cross-sectional view showing the gas cock device in a valve open state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas cock main body 2 Rod 5 Needle main body 5b Valve seat 6 Needle valve body 6b Bar 8 Cam (rotating body) 8b Cam surface 9 Cam guide 10 Base plate 11 Cam plunger 13 Operating shaft 50 Gas passage B Needle valve

Claims (2)

[Claims] When the operating shaft supported by the gas cock body is rotated, the cam plunger in the gas cock body moves in the axial direction in conjunction with the rotation of the operating shaft, and moves in the axial direction in conjunction with the movement of the cam plunger. In a gas cock device in which a rod extending in the axial direction moves in the axial direction and a safety valve that has been closed by closing the gas passage by being pushed by the rod opens, a needle valve body that is movable forward and backward with respect to a valve seat formed in the gas passage. Attach a needle valve for adjusting the gas supply amount that adjusts the amount of passing gas at the distance between the valve and the valve seat.A rotatable body that rotates in conjunction with the operation shaft is rotatably mounted on the gas cock body, and is spirally mounted on the rotatable body. A gas cock device, wherein an extended cam surface is formed to engage with a needle valve body, and when the rotating body rotates, the needle valve body moves forward and backward to adjust a gas supply amount. 2. The cam plunger is engaged in a state in which the cam plunger rotates in conjunction with the operation shaft.
The gas cock device according to claim 1, wherein the gas cock device is engaged so as to rotate in conjunction with the cam plunger.