JPH0335982Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an ignition valve mechanism in gas combustion appliances such as bathtubs and water heaters.

(Prior art) As an ignition valve mechanism in gas combustion appliances such as bathtubs and water heaters, a pilot valve connected to a pilot burner, a main valve connected to a main burner, and a solenoid valve common to these valves are used as valve mechanisms. Some devices are operated by an operating shaft inserted into the main body of the device so as to be movable back and forth in the axial direction. This mechanism performs ignition by opening the pilot valve and solenoid valve by moving the operating shaft forward, and when the operating shaft is returned to a predetermined position by a spring after ignition, that is, the operating shaft moves backward. At this time, an operating member provided on the operating shaft operates the operating protrusion of the main valve to open it.

Conventionally, the actuating member is swingably fixed to an operating shaft f, as shown in FIGS. 3 and 4, for example, and returned to a predetermined position during free movement by an engaging portion g and a return spring h. It is configured to do so. When the operating member e moves from state a to state b in each figure, that is, when moving the operating shaft f forward,
Since the operating projection k is rotated against the return spring h by pushing the front inclined surface j, the operating projection k of the main valve i is not pushed. Next, as shown in c, when the pilot valve 1 and the solenoid valve (not shown) are opened to reach the position where the ignition operation is performed, the engagement with the operating protrusion k is disengaged, and the engaging portion g and the return spring h are engaged. Return to the specified position. Next, when the operating shaft f moves backward after the ignition at c,
The actuating protrusion k reaches a radially projecting step n via the inclined surface m of the actuating member e, and thus the main valve i
This is to maintain the open state to continue combustion.

(Problem to be solved by the invention) In this way, in the conventional configuration of the actuating member, an engaging portion g and a return spring h provided on the valve device main body o are required in addition to the actuating member e, and processing and assembly are troublesome. In addition to being expensive, there is a problem that malfunctions are likely to occur due to deterioration or damage to the return spring h.

The present invention aims to solve the above problems.

(Means for Solving the Problems) Means for solving the above-mentioned problems will be explained with reference to drawings corresponding to embodiments. 1, into which an operating shaft 2 is fitted so as to be freely movable back and forth in the axial direction, and a pilot valve 4 which opens in conjunction with the forward movement of the operating shaft 2;
A solenoid valve 3 which is pushed and opened by the tip of the operating shaft 2 is provided, and a main valve 5 is provided in the lateral direction of the operating shaft 2 between the solenoid valve 3 and the pilot valve 4.
The main valve 5 is provided with an operating protrusion 6 in the direction of the operating shaft 2, and the operating shaft 2 is rotatably provided with an operating cylinder 7, and the operating projection 6 is provided on the outside of the operating cylinder 7. A plurality of engaging axial operating grooves 8 are formed rotationally symmetrically, and one wall surface of each operating groove 8 is configured as a spiral turning surface 14,
An inclined surface 1 is provided on the axially forward side of the rear portion 9 of the operating groove 8.
0, an actuating step 11 is formed which projects radially, and the front side of the actuating step 11 is configured as a front portion 13 of the helical turning surface 14.

(Function and Example) To explain the function of the above configuration together with an example, first, in FIG. , that is, it is held at the leftmost position in the figure,
Therefore, the pilot valve 4, the main valve 5 and the solenoid valve 3
Both are closed.

In this state, when the operating shaft 2 is moved forward, that is, to the right in the figure, via an appropriate ignition operating mechanism (not shown), the operating shaft 2 is moved as shown in FIG. 1b.
At the same time, the pilot valve 4 that moves together opens, and the solenoid valve 3 is also opened by being pushed by the tip of the operating shaft 2, so that gas is supplied to the pilot burner (not shown) via the solenoid valve 3 and the pilot valve 4. and ignition is performed.

During such forward movement of the operating shaft 2, the operating cylinder 7 crosses the operating protrusion 6. At this time, the operating protrusion 6
comes into contact with the front part 13 of the spiral turning surface 14 and pushes it, so that the operating cylinder 7 rotates counterclockwise when viewed from the right in the figure. In this operation, the operating protrusion 6
does not receive the lateral force of the operating shaft 2 from the operating cylinder 7,
Therefore, the main valve 5 will not open.

In this way, as shown in FIG.
When the actuating tube 7 is moved to the forward moving end, the actuating barrel 7 is rotated by the actuating protrusion 6 as described above, and the actuating stepped portion 11 is positioned axially forward of the actuating protrusion 6.

In this state, by releasing your hand from the operating knob of the ignition operating mechanism, the operating shaft 2 is
moves backward, the actuating tube 7 moves backward without rotating, so the actuating protrusion 6 is relatively aligned with the inclined surface 1.
0 to reach the operating stage 11 as shown in FIG. 1d. Therefore, the operating projection 6 is moved downward in the figure by the lateral force of the operating shaft 2, and the main valve 5 is opened. Therefore, by maintaining the state shown in FIG. 1d by an appropriate holding mechanism in the ignition operating mechanism,
The combustion state can be maintained. In addition, solenoid valve 3
When the thermocouple that constitutes the well-known safety mechanism is heated by combustion, the open state is maintained by the thermoelectromotive force. Further, the above-mentioned opening operation of the actuating projection 6 can be performed more reliably by providing a guide groove (not shown) extending from the rear part 9 of the actuating groove 8 to the actuating step portion 11.

Then, when the ignition operation mechanism performs the extinguishing operation,
The operating shaft 2 is returned to the state shown in FIG. 1a by the return spring, so that the pilot valve 4 and the main valve 5 are
is forcibly closed, the burner is extinguished, and after a predetermined period of time, the solenoid valve 3 also returns to the state shown in FIG. 1a.

At this time, when the actuating projection 6 comes off to the front side of the actuating step portion 11, the actuating cylinder 7
3, the next operating groove 8 is brought into a state similar to that shown in FIG. 1a, and the above-described operation can be performed again.

(Effect of the invention) As described above, in the present invention, the actuating cylinder rotates in one direction every time the operating shaft moves in the front-back direction, and the above-mentioned valve is continuously opened and closed by the actuating grooves provided rotationally symmetrically. Unlike the conventional valve mechanism described above, it does not require an engaging part or a return spring, and is therefore easy to process and assemble, reducing costs and reducing the risk of deterioration of the return spring. Another advantage is that there is no need to worry about malfunctions due to damage or the like.

[Brief explanation of the drawing]

Figures 1 a, b, c, and d are longitudinal sectional views of essential parts showing the structure and operation of an embodiment of the present invention, Figure 2 is a perspective view of an embodiment of the actuating cylinder used in the present invention, and Figures 3 a, b,
c, d are longitudinal sectional views of the conventional example, and Fig. 4 a, b,
c and d are cross-sectional views of the conventional example. Reference numerals 1...Valve device body, 2...Operation shaft, 3...Solenoid valve, 4...Pilot valve, 5...Main valve, 6...Operating projection, 7...Operating cylinder, 8...Operating groove, 9...Rear part, 10
... Inclined surface, 11 ... Actuation step, 12 ... Return spring, 1
3...Front part, 14...Spiral turning surface.

Claims (1)

[Scope of utility model registration request] An operating shaft is fitted into the valve device main body so as to be movable back and forth in the axial direction, and the valve device main body includes a pilot valve that opens in conjunction with the forward movement of the operating shaft, and a tip of the operating shaft. A solenoid valve is provided which is pushed to open by a solenoid valve, and a main valve is provided in a lateral direction of the operating shaft between the solenoid valve and the pilot valve,
The main valve is provided with an operating protrusion in the direction of the operating shaft, and an operating barrel is rotatably provided on the operating shaft, and an axial operating groove that engages with the operating protrusion is rotatably provided on the outside of the operating barrel. A plurality of actuating grooves are formed symmetrically, one wall surface of each actuating groove is configured as a spiral turning surface, and an actuating step portion protruding radially through the inclined surface is provided on the axially forward side of the rear part of the actuating groove. 1. A valve mechanism for ignition in a gas combustion appliance, characterized in that the front side of the operating step portion is configured as a front portion of the spiral turning surface.