JPH05682Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a needle rod drive mechanism in a gas control device.

(Prior art) A gas control device operates an igniter to ignite at the same time as the valve is opened, and then adjusts the gas amount from strong (large fire) to weak (small fire) using a linear lever. For example, as shown in Utility Model Application Publication No. 59-25771, many proposals have been made by the applicant and others.

The above-mentioned adjustment of the firepower is performed by moving the needle rod forward and backward using a linear lever, but in the conventional device, as shown in FIG. engaging and interlocking with a single cam slot 38 provided in the lever 37;
Generally, the needle rod 35 is biased by a spring 39.

(Problem to be solved by the invention) However, in this conventional type, the movement of the needle rod is transmitted through the inclined cam surface 3 of the cam slot as shown in Fig. 7.
On the other hand, since the pin 36 in sliding contact with the lever moves over a mountain, the resistance during operation is large, and the difference in load in the operating direction of the lever becomes large especially when moving forward and backward. For example, when the needle opening is increased, it becomes heavier, and when the needle opening is decreased, it becomes lighter. Therefore, there is a problem in that the operability of the linear lever is poor and it is difficult to operate it quickly and reliably.

Therefore, the technical problem of the present invention is to eliminate the difference in the operating load of the operating lever in the forward and backward directions of the needle rod, and also to eliminate the wobbling in the forward and backward directions of the needle rod and improve the flow characteristics. do.

(Means for Solving the Problems) In order to solve the above-mentioned technical problems, the present invention provides a needle rod 5 for restricting the gas flow rate in the passage 4 leading from the gas inlet 2 to the gas outlet 3 of the flow regulator main body 1. In a device in which the needle rod 5 is slidably provided and is interlocked to move forward and backward by an operating lever 7 that swings about a pivot 6, a maximum flow position is set at the base end 7a of the operating lever 7. Two substantially parallel cam grooves 8 and 9 are provided with narrow parallel spacing from A to just before the minimum flow rate position B, and widen at the very end so that the spacing widens at the minimum flow rate position B. 5 side has two pin holes 1 in the front and back
0 and 11 are opened, and a connecting pin 12 made of a U-shaped wire spring whose free length is larger than the outer diameter between the two pin holes is engaged with the pin holes 10 and 11 so as to protrude upward from below. and the front and rear leg rod portions 12a, 12b are respectively fitted into the two cam grooves 8, 9, and the connecting pin 12 is inserted into the both leg rod portions 12a fitted into both the cam grooves 8, 9. ,1
The spring size between the two leg rods is set to be smaller than the size between the plate parts so that the plate part between both cam grooves is compressed by the elasticity between the cam grooves 2b and 2b from the maximum flow position A to just before the minimum flow position B, and At the minimum flow rate position B, the end portion 9a of the rear cam groove 9 widens, and the end portion 9a of the rear cam groove 9 widens.
A gap G is provided between the front leg rod 12a and the rear leg rod 12b, and the needle rod 5 is moved by the reaction force f of the spring pressure on the front leg rod 12a side.
It is made by pressing in the closing direction.

(effect) The above technical means works as follows.

FIG. 2 shows the minimum flow rate, and FIG. 3 shows the maximum flow rate.

When the operating lever 7 is operated to the right or left, the base end 7a swings about the pivot shaft 6 as shown in FIG. 12, the needle rod 5 moves forward (arrow A) or backward (arrow B).

When the needle rod 5 moves forward A, the needle tip 5a closes the passage opening 4a, so the gas flow rate becomes minimum. (Fig. 2) Conversely, when the needle rod 5 moves toward the rear opening, the needle tip 5a moves away from the passage opening 4a, so the gas flow rate becomes maximum as shown in Fig. 3.

If the width of the free length of the connecting pin 12 is S (Fig. 8), and the outer diameter between the two pin holes 10 and 11 of the needle rod 5 is E, then S = 5.1 mm and E = 5 mm, then the connecting pin is 12 to pin hole 1 of needle rod 5
0 and 11, the width of the connecting pin made of a U spring is compressed by 0.1 mm, and no play occurs between the needle rod and the connecting pin.

Further, if the dimension between the leg rod portions 12a and 12b at this time is F, then F=E-2×d-α, where d=φ0.5 and α=deflection amount 0.2 mm.

F=5-2×0.5-0.2=3.8mm.

When the operating lever 7 is operated from the maximum flow position A to just before the minimum flow position B, or in the opposite direction, the connecting pin 12 moves in the two cam grooves 8 and 9, and the leg portion 12a of the connecting pin 12 moves. , 12b pinch the plate portion between the grooves.

The width of the plate portion of the cam grooves 8 and 9 is T, T>F If so, no backlash will occur.

If T = 3.8mm and F = 3.6mm, when the operating lever is assembled into the cam groove, the U spring internal dimension of the connecting pin will be 3.8mm, which will be expanded by 0.2mm.

At the minimum flow rate, the leg portions 12a, 12b of the connecting pin 12 are at the extreme ends 8a, 9 of the cam grooves 8, 9.
reach a. At the same time, the tip 5a of the needle rod 5 comes into contact with the passage opening 4a. At the same time, since the extreme end 9a of the rear cam groove 9 has a D dimension widening part, the rear leg rod part 12b is released from being pressed and a gap G is created as shown in FIG. Since the front leg rod 12a is pressed against the inner wall of the full stroke cam groove, a reaction force f acts due to the bending of the front leg rod, and a pressing force due to spring pressure acts on the needle rod 5.

(effect) The present invention has the following unique effects.

The needle rod moves forward and backward easily and smoothly without any load from spring pressure or cams.

One U-shaped connecting pin made of spring material serves both the needle interlocking action of the conventional traction coil spring and the guide pin, which is advantageous for the coil because it requires fewer parts and has a simpler structure.

The backlash in the forward and backward directions of the needle rod is reduced, and variations in flow rate can be prevented.

There is no difference in lever operation load depending on direction when operating low or high heat. Therefore, it is easy to operate.

Easy to assemble and easy to replace needles when changing gas types, etc.

(Example) A preferred embodiment of the invention is shown below.

FIG. 1 shows the case where the present invention is applied to a push button type gas valve. In the figure, 20 is the valve case body, 21 and 22 are push buttons for ignition and extinguishing, and when the ignition push button 21 is pressed, the main valve, pilot valve, and safety valve open, and at the same time the micro switch for the igniter (both (also not shown) is pressed to ignite the gas.

When the operating lever 7 is operated in this state, the needle rod 5 moves forward and backward as described above, thereby restricting the gas amount and adjusting it within the range from the maximum flow rate (large fire) to the minimum flow rate (small fire).

When the fire extinguishing push button 22 is pressed during gas combustion, the main valve is pushed in the closing direction and the outflow of gas is stopped.

The present invention can also be applied to gas valves other than push-button type gas valves, such as closed-closing rotating type gas valves.

The flow regulator body 1 is integrally connected to the valve case body 20 so that the gas inflow and outflow ports are aligned. The gas communicates from the main inlet 23 of the valve case body 20 to the gas inlet 2 of the regulator body 1, from there through the needle rod 5, from the gas outlet 3 to the main outlet 24, from which it flows out to the gas burner section.

The needle rod 5 is provided with an orifice hole 25. Therefore, when the needle rod 5 moves forward and the passage 4 is closed, the gas flows only through the orifice hole 25, and the amount of gas becomes small.

The U-shaped connecting pin 12 made of a wire spring has a spring-like elasticity, and is attached to the front and rear leg rods 1.
2a and 12b are loosely inserted into the two front and rear pin holes 10 and 11 of the needle rod 5 from below upward.

Two cam grooves 8 on the base end 7a of the operating lever 7,
9 are almost parallel from the maximum flow position A to just before the minimum flow position B, as shown in FIG.
At the minimum flow position B, the rear leg rod portion 12b is widened so as to be pushed forward by a predetermined distance D (arrow A).

[Brief explanation of the drawing]

Figure 1 is a plan view of the present invention applied to a push-button gas valve, Figures 2 and 3 are cross-sectional views of the device of the present invention, Figure 2 is the minimum flow rate, and Figure 3 is the maximum flow rate. show. Fig. 4 is a plan view showing the action of the operating lever, Fig. 5 is a sectional view of the conventional device, Fig. 6 is an explanatory diagram showing the action of the conventional cam groove and pin, and Fig. 7 is the cam groove of the present invention. Fig. 8 is a front view of the connecting pin when it is at its free length, Fig. 9 is a dimensional drawing of the needle rod operating lever cam groove, and Fig. 10 is a sectional view of the connecting pin assembled into the needle rod. be. 1...Flow rate regulator body, 2...Gas inlet, 3...
...Gas outlet, 4...Passage, 5...Needle rod, 6
... Pivot, 7 ... Operation lever, 8, 9 ... Cam groove, 10, 11 ... Pin hole, 12 ... Connection pin.

Claims (1)

[Scope of utility model registration request] From gas inlet 2 to gas outlet 3 of flow regulator body 1
A needle rod 5 for restricting the gas flow rate is provided in the passage 4 leading to the passage 4 so as to be slidable back and forth.
In this device, a control lever 7 that swings about a pivot 6 moves forward and backward in conjunction with the control lever 7, in which the base end 7a of the control lever 7 is parallel to the base end 7a from the maximum flow position A to just before the minimum flow position B. Two substantially parallel cam grooves 8 and 9 are provided at the extreme end so that the interval is narrow and the interval widens at the minimum flow position B, and two pin holes 10, front and rear, are provided on the corresponding needle rod 5 side. 11, and a connecting pin 12 made of a U-shaped wire spring whose free length is larger than the outer diameter between the two pin holes is inserted into the pin holes 10 and 11 so as to protrude upward from below. , the front and rear leg rod portions 12a and 12b are respectively fitted into the two cam grooves 8 and 9, and the connecting pin 12 is fitted into the two leg rod portions 12 which are fitted into both the cam grooves 8 and 9.
a, 12b from maximum flow position A to minimum flow position B
The spring size between the two leg rods is specified to be smaller than the size between the plate parts so that the plate part between both cam grooves is compressed by the elastic force immediately before the position B, and the minimum flow rate position B
Then, due to the widening of the rear cam groove 9's extreme end 9a, a distance G is provided between the extreme end 9a and the rear leg rod 12b, and the needle rod 5 is moved by the reaction force f of the spring pressure on the front leg rod 12a side. A needle drive device for a gas flow rate regulator, characterized in that the needle drive device is configured by pressing the needle in the closing direction.