JPS591931B2 - Gas valve operating mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas valve operating mechanism for equipment having multiple combustion sections, and is extremely user-friendly as it allows the McNet valves of multiple pilot safety devices to be set to the open state at the same time. In particular, the object is to obtain a mechanism that can accommodate differences in the dimensions and springs of a plurality of magnetic valves and can reliably set the valve in an open state.

Examples thereof will be described below with reference to the accompanying drawings.

FIG. 1 shows a gas circuit in which there are two combustion sections.

Parallel gas paths connecting the first main valve 1a and the second main valve 1b are led to the first burner 2a and the second burner 2b, and a pilot gas path is connected in parallel with the gas paths of the main valves 1a and 1b. There is a gas path connected to the valve 3, the end of which branches off to each combustion section, and connects to the first pilot burner 4.
a and the second pilot burner 4b.

There are also two sets of thermocouples heated by the pilot burners 4a and 4b, and the first thermocouple 5a and the second thermocouple 5b are connected to the first magnetic valve 6a and the second magnetic valve 6b, respectively, and the two sets of pilots are heated. It forms a safety device.

The safety switches 7a and 7b are activated by humidity or hydraulic pressure to prevent accidents such as burnout.

Reference numeral 8 denotes an auxiliary pilot burner located at the end of the half-release valve 9, and although it is located near the first pilot burner 4a in the figure, it can also be switched to the second pilot burner 4b side.

Reference numeral 10 denotes an igniter, which is connected to a first ignition electrode 11a and a second ignition electrode 11b to ignite both pilot burners 4a and 4b.

Now, the two magnet valves 6a and 6b are connected in series on the inlet side of the gas circuit, and after passing through both magnet valves, the aforementioned first main valve 1a + second main valve 1b, pilot valve 3.
A half-release valve 9 is connected in parallel.

The igniter 10 has both ignition electrodes 11a. 11b at the same time.

Since the magnetic valves 6a and 6b are in series, both pilot burners 4a and 4b are connected to each other by a point hole and a respective thermocouple 5.
This device can only be used when heating a and 5b, and even if either pilot burner misfires, the entire cass circuit is closed.

Therefore, the pilot burner that has not misfired also goes out, and both magnetic valves 6a and 6b are eventually closed.

Since the circuit is in series, the time from when the pilot burner sparks until the gas stops is determined by the same factors as when there is only one combustion section, and there is no risk that the time will be extended even if there are multiple combustion sections. None.

Since two magnet valves 6a and 6b are inserted in series in the gas circuit, both must be pressed simultaneously to open the valves so that they can be held by suction.

A specific example is shown in FIG.

Reference numeral 12 denotes an operating shaft through which rotation of the operating bundle 30 is transmitted via a pair of remote operating mechanisms 28 and 29, as shown in FIG.

The operating shaft 12 has a first cam 14 that opens and closes the first main valve 1a.
A second cam 15 that opens and closes the second main valve and a pilot cam 16 that opens and closes the pilot valve 3 are fixed, and open and close the joint valve depending on the shaft rotation angle.

A connecting pin 13 is fixed through the operating shaft 12 near its tip.

17 and 18 are a fixed cam and a rotor, respectively, and each has an appearance as shown in FIG.

Cam pins 19 and 20 that penetrate the rotor 18 in the radial direction protrude from its outer peripheral surface, but since the cam pins are separated by a cam pin spring 21, they can be freely retracted by applying an external force.

Now, let's explain this operation using FIG.

The tip of the operating shaft 12 is inserted into the rotor 18 (see Fig. 2), and the connecting pin 13 is inserted into the groove 18 of the rotor 18.
It's in B.

Further, the cam pin 19.degree. 20 protrudes in the radial direction below the fixed cam 17.

As shown in FIG. 4, when the operating shaft 12 begins to rotate, the connecting pin 13 and the groove 18B engage, and the rotor 18 begins to rotate.

When the cam pins 19.20 also begin to rotate in this manner, the cam pins 19.20 abut against the slopes of the fixed cam 17, causing the entire rotor 18 to move downward while rotating along the slopes.

Therefore, the positional relationship between the groove 18B and the connecting pin 13 also changes,
Eventually, the connecting pin 13 comes to rest on the stepped portion 18C.

This is when the cam pins 19 and 20 are rotated exactly 90 degrees, and the cam pins 19 and 20 come out of the range of the slope 17A and hit the fixed cam 17 at 17B.
It collided with and stopped rotating.

Also, the slope 17A that supported the cam pins 19 and 20 has already passed and is supported by the connecting pin 13, and is supported by the return spring 24 and the magnet valve 6a, which will be described later.

Even if the spring reaction force 6b is acting, the rotor 18 maintains its downward position.

At this position, if the one-turn torque applied to the operating shaft 12 is released, or if it is turned slightly in the opposite direction, the locking at the stepped portion 18C is released and the rotor 18 returns to its original position.

The above is the ignition operation, and the rotor 1 is rotated by 90 degrees.
Since the valve 8 can be displaced downward and returned to the parent position, this operation can be used to press the opening of the magnetic valves 6a and 6b.

That is, the drive shaft 22 that abuts the lower part of the rotor 18 has a large-diameter portion 22A in the middle, and a suppressing member 23 is provided that is swingably supported by the large-diameter portion 22A.

Since this suppression member 23 is always pressed against the large diameter portion 22A by the escape spring 27, the movement of the rotor 18 is controlled by the drive shaft 22. It is transmitted to the suppression member 23 via the relief spring 27.

A push shaft 23A is fixed to one end of the suppressing member 23 and faces the first magnetic valve 6a, and the other end faces an interlocking shaft 26 positioned so as to suppress the second magnetic valve 6b.

24 is a drive shaft 22. Further, the suppressing member 23 is a spring that is always biased in a direction to pull the rotor 18 away from the magnetic valve.

Further, 25 is a bellows that gas-seals the interlocking shaft 26 and does not prevent axial movement.

Therefore, the movement of the rotor 18 is controlled by the magnet valve 6a s6b.
transmitted to.

Also, at the same time, the lower tapered portion 18A of the rotor 18 faces the half-release valve 9 and opens this valve, so when the magnetic valve is pressed and held in the open state, the air in the gas pipe is exhausted at once. .

At this time, although not shown in Fig. 2, it is also possible to open and close the ignition switch that starts the igniter by protruding the shaft to the outside with the same configuration as the half-release valve 9, so operate it as shown in Fig. 4. Rotate the shaft from stop to ignition, and open the magnetic valve 6.
Four operations can be performed: opening the valves a and 6b, opening the half-release valve 9, turning on the ignition switch, and opening the pilot valve 3.

Next, when the rotor 18 is returned upward in FIG. 2 using the operating shaft 12, the half-release valve 9 is closed, and although not shown, the ignition switch is turned off and the pressing operation of the magnetic valves 6a and 6b is also released.

I'm self-responsible by igniting it, so magnet valve 6
The valves a and 6b remain open.

Also, since the pilot valve was opened by the pilot cam, it is unrelated to the movement of the rotor 18.

Next, the cam pin 19°20 that further rotates the operating shaft 12 is the third
It hits the relief groove 17E of the fixed cam 17 shown in the figure and is retracted inward from the outer peripheral surface of the rotor, so that rotation is not hindered.

The shape of each cam is determined so that a rotation of 135 degrees opens the first main valve 1a, and a rotation of 180 degrees opens the second main valve 1b.

The open/close state of this bidirectional valve can be arbitrarily selected.

When returning to its original position, the cam pins 19 and 20 escape inward, so the rotor 18 rotates without moving up or down.

Now, in general, the stroke and spring reaction force required for magnetic valves to be held by suction vary depending on production and the diameter of the valve. It is not easy to achieve this with only uniaxial displacement.

In the present invention, the position of the drive shaft 22 is
, 6b are selected so that the moments due to the spring reaction forces of the springs are equal, so even if the spring reaction forces are different, the force applied to the relief spring 27 provided around the drive shaft 22 is the same.

Therefore, as shown in FIG. 5A, the suppressing member 23 moves while remaining horizontal.

In FIG. 5A, the rotor 18 is pressed just to the adsorption position, but in reality the rotor 18 moves a little further downward.

The amount of movement is absorbed by the relief spring 27 and the pressing member 2
3 does not move.

Next, if there is a difference in the stroke of the magnet valve or a difference in the dimensions of the body to which it is attached, the suppression member 23 is tilted around the first drive shaft 22 as shown in FIG. 5B, and the magnet valve 6a Even if the magnet valve 6b is pushed all the way first and hits, the magnet valve 6b can also be sufficiently pressed.

This is due to the conditions that the escape spring 27 exists around the drive shaft, that the drive shaft 22 supports the pressing member 23 in a swingable manner, and that the drive shaft itself is at a position where the moment due to the spring reaction force is equal. has been achieved.

As a method of absorbing the discrepancy in the strokes of the magnetic valve, for example, a relief spring can be inserted between the interlocking shaft 26 and the pressing member 23 to prevent direct pressing, or the interlocking shaft 26 itself can be expanded and contracted in the longitudinal direction of the shaft. A method of configuring it with a composite body is also considered, but not only will the configuration become complicated, but since the springs work in two stages, the force relationship between them will be complicated and malfunctions will likely occur.

In the present invention, there are a plurality of magnetic valves, and there is only one set of mechanisms for opening the valves by pressing, but since they are equipped with the elements described above, it is possible to open the valves by pressing so that any magnetic valve can be reliably opened by pressing. I can do it.

As described above, according to the present invention, the magnetic valves of multiple pilot safety devices can be opened at the same time, making it very convenient to use, and also absorbing variations in the force and stroke of the magnetic valves to ensure accurate valve operation. It is something that can be done and has excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a gas circuit diagram showing an embodiment of the present invention, Fig. 2 is a sectional view of the operating mechanism, Fig. 3 is an exploded perspective view of its main parts, and Figs. 4 and 5 A and B are explanatory diagrams of operation. It is. 4a, 4b-pilot burner, 6a, 6b...
Magnetic valve, 22... Drive shaft, 23... Suppression member, 27... Relief spring.

Claims (1)

[Claims] 1. Provide the same number of high-lot safety device magnetic valves that correspond to multiple pilot burners, and provide a drive shaft movable in the opening/closing direction of the magnetic valves at a position where the moment due to the spring reaction force of each magnetic valve is equal. A relief mechanism such as a spring is interposed between the drive shaft and an integral suppressing member that sets the valve in an open state, and the suppressing member is provided to be swingable about the drive shaft. Gas valve operating mechanism.