JPS5932710B2 - gas control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas control device that controls the gas supplied to a burner with a small operating force.

The method that has been adopted so far for opening and closing multiple gas valves with the same operating shaft is to fix a cam with different cam surfaces on the inner and outer peripheries to the operating shaft, and to control the valve rod of each gas valve. Each corresponded to the cam surface.

Such conventional examples are shown in FIGS. 9 to 12.

That is, the cam 60 has tapered portions 60a and 60b, and when the valve rod 62 is pressed by the rotation of the knob 61 and the electromagnet 63 and the suction plate 64 are brought into pressure contact, the cushion box 65
When the cushion box separates from the adsorption plate 64, which was in sufficient pressure contact by absorbing the stroke of the cam 60 due to the deflection of the cushion spring, and from the electromagnet 63, the cushion box is held by hooking its tip with a ring 65a. .

Furthermore, as shown in FIGS. 11 and 12, the operating shaft 66 and the cam 6
0 has no play and the cam surfaces 60a, 6 of each valve rod 62, 62a
Since the sliding resistance of 0b is applied to the operating shaft 66,
The auxiliary valve 67a could not be opened or closed regardless of the main valve 67, and it was difficult to turn off the output of the gas combustion section with a small operating force.

In the figure, 68 is a safety valve, and 69 is a spring.

The present invention solves the drawbacks of the conventional example described above, and includes an electromagnet excited by thermoelectromotive force of a thermocouple, a suction plate that attracts the electromagnet, a safety valve body interlocked with the suction plate, and a pressurizing valve body that presses the safety valve body. A main valve element that opens and closes the gas, a valve rod that presses the main valve element, a leaf spring that overlaps the main cam that slides on the tip of the valve rod, and a leaf spring that is parallel to the main valve element. It is equipped with a sub-valve for changing the heating power, and a cock connected to the operating shaft in parallel with the main valve and the sub-valve, and with an angle of play between the main valve, the sub-valve and the rotary operating shaft. linked,
When the play angle of the main cam with respect to the rotating operation shaft is θ1, and the play angle of the sub-cam is θ2, set θ1>θ2, and the closing force of the main valve and sub-valve is formed on the main cam and the sub-cam, respectively. It is something.

The present invention solves these conventional problems, and embodiments thereof will be described below with reference to the accompanying drawings.

First, Fig. 1 shows the gas flow system path to the burner section, in other words, 1 and 2 are gas burners, and the gas path 3 to one gas burner 1 is equipped with a well-known electromagnetic safety valve powered by a thermocouple 4. 5. The main valve 6, the shutoff 7, and the governor 8 are connected in this order from the upstream side, and a gas path 9 is connected from one part of the gas path 3 connecting the gas burner 1 and the governor 8 to the other gas burner 2. The gas passage 9 is branched, and a sub-valve 10 is connected in the middle of the gas passage 9.

Reference numeral 11 indicates a gas path to a pilot burner 13 that is opened and closed by a pilot valve 12.

Now, if you open the electromagnetic safety valve 5 and shutoff 7, and then open the main valve 6 and sub-valve 10, both gas burners 1 and 2 will burn, and if you close the sub-valve 10, only gas burner 1 will burn, and the output will be reduced to %. Become.

The gas control device shown in FIGS. 2 and subsequent figures is a unit made up of the electromagnetic safety valve 5, main valve 6, stopper 11, auxiliary valve 10, and pilot valve 12, and will be described in detail below.

14 is a main body in which the electromagnetic safety valve 5, main valve 6, shutoff 1 and pilot valve 12 are installed in the gas passage 17 extending from the inlet 15 to the outlet 16, and as shown in FIG. A sub-valve 10 is provided in a gas passage 20 having an inlet 18 and an outlet 19.

The outlet 16 is connected to the governor 8 shown in FIG. Each is connected to one gas burner 2.

Furthermore, a pilot gas outlet 21 opened and closed by a pilot valve 12 is connected to a gas path 11 to a pilot burner 13 .

The electromagnetic safety valve 5 has an electromagnet 22 connected to the thermocouple 4, a suction plate 23 facing the electromagnet 22 at one end, and a safety valve body 26 energized by a spring 24 to close the valve seat 25. It consists of:

On the other hand, the main valve 6 is disposed in line with the electromagnetic safety valve 5, and includes a main valve body 28 that opens and closes a valve seat 27 formed opposite to the valve seat 25, and a valve rod 29 whose tip protrudes from one surface of the main body 14. ,
It consists of a closing spring 30.

The configuration of the sub-valve 10 is also similar to that of the main valve 6, and the valve seat 3
1, a valve rod 33, and a closing spring 34 are provided.

Further, the closure member 7 opens and closes the gas passage 11 by rotation, and is linked to a rotation operation shaft 36 via a cam mechanism 35.

The cam mechanism 35 is for operating the pilot valve 12 in the axial direction in response to the rotation of the rotation operating shaft 36.

37 is a knob attached to the tip of the rotating operation shaft 36, and 38 and 39 are a main cam shaft and a sub cam.

A rotary operating shaft 36 is rotatably passed through the shaft holes 40 and 41 of the main cam 38 and the sub-cam 39, and a part of the peripheral wall of the rotary operating shaft 36 is cut out to form a flat surface 42. , shaft hole 4
By forming chevron-shaped protrusions 43° and 44 at 0 and 41, respectively, the play angle θ with respect to the rotation of the rotation operation shaft 36 is reduced.
1. The main and sub cams 38 and 39 are designed to rotate in conjunction with each other at a distance of θ2.

The relationship between the play angles θ1 and θ2 above is set to θ, 〉θ2, and θ
1 is 60°, θ2 is 30°, and the angle 0° is not included.

The tip of the valve rod 29 of the main valve body 28 is positioned within the rotation range of the cam surface 45 of the main cam 38, and the tip of the valve rod 33 of the sub-valve body 32 is positioned within the rotation range of the cam surface 46 of the sub-cam 39. It's a shame.

The cam surface 45 of the main cam 38 has an inclined surface 4T, a flat portion 48 whose front end is connected to the top of the inclined surface 47, and an inclined portion 4 that stands up more diagonally from the rear end of the flat portion 48.
9, and at least the inclined portion 49 is constituted by a leaf spring 50 whose upper end is a free end.

The cam surface 46 of the sub-cam 39 includes an inclined portion 51 and a flat portion 52 whose front end is connected to the uppermost end of the inclined surface 51.

The reason why the valve rod and the cam surface are kept in constant contact is that by constantly contacting the valve rod and the cam surface, the valve rod and the cam surface slide smoothly, which has the effect of softening the shock caused by temporary contact.

Further, when the knob 37 is turned to the maximum extent, the deflection of the inclined portion 49 of the leaf spring 50 of the main cam 38 becomes maximum, and the electromagnet 22
After the contact of the suction plate 23 is suppressed without any force, when the hand is released, only the cam automatically moves freely from the operating shaft by an angle of θ1-θ2, thereby obtaining the same effect as when there is no sliding resistance. There is a particular thing.

In the above configuration, FIGS. 2 and 8a show a state in which all gas flow is stopped.

That is, the cam surfaces 45.46 of the main and sub cams 38.39 are located apart from the valve rod 29.33, and therefore,
Not only the main valve body 28 and the sub-valve body 32 but also the safety valve body 26 are closed.

Further, the rotational position of the rotational operation shaft 36 is at 0°, and the closing member 7
And the pilot valve 12 is also closed.

Next, rotate the rotation operating shaft 36 counterclockwise by 1 as shown in Figure 8.
When rotated by 00 degrees, the tip of one valve rod 29 first touches the main cam 3.
When the main valve body 28 reaches the flat part 48 from the inclined surface 47 of No. 8 and fully opens, and further rotates to 115 degrees, the tip of the other valve rod 32 slides from the inclined surface 51 of the sub-cam 39 to the flat part 52.
Push open the sub-valve body 32 (FIG. 8C).

Next, when the operating shaft 36 is rotated to 135°,
The valve rod 29 moves from the flat part 48 to the inclined part 49, and the main valve body 28 is further raised from the above-mentioned fully open point.

Due to the movement of the main valve body 28 above the fully closed point, the safety valve body 26
is opened, and a suction plate 23 integrated therewith comes into contact with the electromagnet 22.

On the other hand, the closure 7 opens the gas passage 17 in the range where the operating shaft 36 is rotated by 100° to 135°, and
When the rotation angle is 115° to 135°, the pilot valve 12 is closed via the cam mechanism 35.

However, in FIG. 1, the pilot burner 13 is ignited by a suitable ignition means, and at the same time the gas ejected from one gas burner 1 via the governor 8 is a pilot flame.
The gas ejected from the other gas burner 2 is ignited by the transfer of flame from the gas burner 1.

After a while after the combustion of the gas burner 1 starts, the thermocouple 4 heated by the combustion heat generates a sufficient thermoelectromotive force to excite the electromagnet 22, and thereby the adsorption plate 23 is attracted to the electromagnet 22. This is to maintain the open state of the safety valve body 26.

Here, if the external force of the operating shaft 36 is removed, the valve rod 2 of the main valve body 28
9 slides down the inclined part 49 by the action of the spring 30,
A flat portion 48 is reached.

Therefore, the main valve body 28 returns to the fully open position (Fig. 8e).

By returning the main valve body 28 to the fully open point in this way,
This allows the safety valve body 26 to close.

Further, as the valve rod 29 slides down the inclined portion 49, the main cam 38 rotates the operating shaft 36 clockwise to a position of 115°, thereby closing the pilot valve 12.

Further, the secondary cam 39 may remain as it is or may rotate slightly clockwise depending on the frictional force between the main cam 38 or the frictional force between the valve rod 33, but in any case. The valve rod 33 is located on the flat part 52 of the sub-cam 39 and the sub-valve body 3
2 remains open.

The reason why the inclined portion 49 of the main cam 38 is formed by the leaf spring 50 is that the elasticity of the leaf spring 50 can be used to ensure that the suction plate 23 comes into contact with the electromagnet 22 without any force.

Next, when the operating shaft 36 is returned clockwise to 70° as shown in FIG. 8f, one of the main cams 38 does not operate at all due to the play angle θ1.

However, in the case of the sub-cam 52 with a small play angle θ2, the operation shaft 36 is
In the process of returning to 0°, it is also rotated clockwise in conjunction with the above shaft.

When the tip of the valve rod 33 reaches the inclined surface 51, the sub cam 52 is energized clockwise within the range of the play angle θ2, thereby rapidly closing the sub valve body 32 and stopping the combustion of the gas burner 2. , the overall combustion output is halved.

Further, when the sub-cam 52 is biased clockwise, the play angle θ2 is set to the clockwise rotation side of the operating shaft 36.

Therefore, when the operation shaft 36 is now rotated counterclockwise again, the sub cam 52 is immediately interlocked to open the sub valve body 32.

In other words, the difference in play angle (θ1-θ2) causes the main cam 3 to
The auxiliary valve body 32 can be opened and closed by rotating only the auxiliary cam 52 without operating the cam 8 at all, and the combustion output can be switched with little effort.

On the other hand, when closing the main valve body 28, the operating shaft 36 can be returned to 60° as shown in FIG. 8g.

Even when the main valve body 28 is closed, the inclined surface 47 is pushed by the tip of the valve rod 29, and the main cam 38 is urged clockwise within the range of play angle θ1, causing the main valve body 28 to close quickly. Helpful.

Since the main valve body 28 and the sub-valve body 32 are quickly closed in this way, abnormal gas supply to the burners 1 and 2 is eliminated, and incomplete combustion thereof can be prevented.

Next, when the rotating operation shaft 36 is returned to θ°, the original state shown in FIG. 8g is returned.

In the above embodiment, the closure 7 is provided to prevent gas leakage, and may be removed depending on the case.

As explained above, in the present invention, the main cam that opens and closes the main valve and the auxiliary cam that opens and closes the auxiliary valve have an play angle of θ1. By setting θ2 in conjunction with the rotary operation shaft and setting θ1>θ2, the auxiliary valve can be opened and closed regardless of the main valve being open, and therefore the output of the gas combustion section can be switched with a small operating force. It is something that can be done, and it can greatly improve one's preferences.

[Brief explanation of drawings]

Fig. 1 is a diagram of the gas supply system to the gas burner, Fig. 2 is a sectional view of a gas control device showing an embodiment of the present invention, Fig. 3 is a sectional view of the auxiliary valve section, and Fig. 4 is a perspective view of the auxiliary cam. , Figure 5 is a perspective view of the main cam, Figures 6 and 7 are diagrams showing the relationship between the sub cam, the main cam and the operating shaft, Figure 8 a''g is an explanatory diagram of the operation, and Figure 9 is a diagram of the conventional example. 10 is an enlarged sectional view of the main part, 1st
FIG. 1 is a perspective view of the cam, and FIG. 12 is a sectional view of the cam's operating shaft attachment portion. 6...Main valve, 10...Sub-valve, 36...
... Rotation operation shaft, 38 ... Main cam, 39.
...Secondary cam, 47°51...Cam surface.

Claims (1)

[Scope of Claims] 1 Consisting of a main valve, a sub-valve, and a main cam and a sub-cam that operate in conjunction with a rotary operation shaft with an angle of play, respectively, to open and close the main valve and the sub-valve; When the play angle of the main cam with respect to the shaft is θ, and the play angle of the sub-cam is θ2, it is set as θ1>θ2, and the difference in the play angle allows only the sub-valve to be opened and closed when the main valve is opened. gas control device. 2. A patent claim characterized in that the upper and auxiliary cams are each formed with an inclined surface that has the play angle within the above range and that applies rotational force to the main cam and the auxiliary cam by the closing force of the main valve and the auxiliary valve. The gas control device according to item 1.