JPH0445731B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field] The present invention relates to an ignition device for a domestic instantaneous water heater, bath kettle, etc. that uses gas as fuel.

[Prior art] Conventional household gas bath pots and gas instantaneous water heaters have a knob that controls the ignition and extinguishing of the main burner for boiling water, and a knob that controls the ignition and extinguishment of the pilot burner, which is the spark for igniting the main burner. Each knob is provided independently, which can be said to be a preferable structure for safe operation of gas appliances. However, for example, in order to remotely control a bathtub placed outdoors from indoors, it is necessary The so-called single-axis operation method, in which only the rotational movement is sufficient, is preferable from the standpoint of simplifying the installation work of the instrument, and the development of such products is currently underway. However, with the ignition devices of these existing gas appliances, while the knob on the ignition operating shaft is brought from the stop position to the open position, it is necessary to pass through two stages: the ignition position and the pilot position, and in the end it takes three stages. The gas appliances were cumbersome to operate, with the gas appliances only starting to work after the knobs were turned, and the product was not particularly worthy of praise for the elderly and children.

[Object of the Invention] An object of the present invention is to provide an ignition safety device for a gas appliance of a uniaxial operation type, which simplifies the ignition operation.

[Structure of the Invention] The ignition safety device for gas appliances of the present invention includes a gas inlet d opened in the casing 4, a gas supply port e leading to the main burner F, and a gas supply port f leading to the pilot burner G, respectively. A cam A is used to open and close the magnetic valve 1, the gas main valve 2, and the pilot valve 3. , B, and C, and attach knob E to the shaft end.
from the “stop” position, and the first
an ignition operating shaft having an "ignition" position achieved when rotated by an angle of , and an "open" position achieved when rotated from the "ignition" position by a second angle less than the first angle in a counter-predetermined direction; 5 is assembled into a casing 4, and the magnetic valve 1 includes:
The gas main valve 2 has a spring g that presses the plate-shaped valve body from the gas inlet d side to the gas flow path inlet side casing, and is electrically connected to a thermocouple I arranged near the pilot burner G. When the plate-shaped valve body located on the gas flow path side, the valve rod 6 into which the plate-shaped valve body is loosely inserted, the spring n which urges the valve rod 6 toward the gas flow path side, and the valve rod 6 are displaced in the direction of the gas supply port e, The pilot valve 3 has a spring i that presses the plate-shaped valve element against the gas flow path outlet side casing, and the pilot valve 3 includes a rod-shaped valve element loosely inserted into the gas flow path from the gas supply port f side, and the rod-shaped valve element. The cam A has a spring h that biases the cam A toward the gas flow path, and rotates together with the ignition operating shaft 5. The cam A has a larger diameter on the magnetic valve 1 side in the "ignition" position, and is slidable in the axial direction. In addition, it is urged in the direction opposite to cam A by a spring m loaded between it and cam A, has a fitting hole 16 and a claw piece 17 for pressing the valve rod 6, and is implanted in the ignition operating shaft 5. The cam B is rotationally driven by the rotation stop pin 13.
When the "ignition" position and the "open" position have a larger diameter than the pilot valve 3 side, and the ignition operating shaft 5 rotates in a predetermined direction, the fitting hole 1
6 has a protrusion 15 having a reverse rotation preventing shape, and
The cam C is formed with flat surfaces r and S that prevent rotation around the axis by pressure contact with a leaf spring 14 disposed in the casing 4, and the position where the flat surface r contacts the leaf spring 14 is located at the main valve. In the "stop" position, the magnetic valve 1 and the pilot valve 3 are closed, and the cam C, which presses the flat surface r against the leaf spring 14, presses the valve rod 6 and closes the main valve 2. At the "ignition" position, where the valve is closed and the pilot burner G is ignited, the spindle 9, which is biased toward the cam A, is pressed by the cam A to open the magnetic valve 1, and the rotation stopper pin is pressed. The cam B rotating under pressure from the cam 13 presses the rod-shaped valve body to open the pilot valve 3, and the pressure of the valve rod 6 is switched from the cam C to the claw piece 17 to keep the gas main valve 2 closed. In the "open" position where the pressure contact of the leaf spring 14 changes to the flat surface S and the main burner F ignites,
The magnetic valve 1 is kept open by the thermoelectromotive force of the thermocouple I, and when the cam B is attached and detached in the direction of the cam A by the protrusion 15 of the cam C, which is prevented from rotating, the pressure on the valve rod 6 by the claw piece 17 is released. The gas main valve 2 is configured to open when the gas main valve 2 is opened.

[Effects of the Invention] The ignition safety device for gas appliances having the above configuration has the following effects.

Cams A, B, and C are inserted into the ignition operating shaft 5, and the spindle 9, valve rod 6, spring g, and the like move in conjunction with the movement of these cams A, B, and C.
By skillfully combining h, m, 14, i, and n, conventionally, the ignition control knob had to be rotated three times to bring it from the "stop" position to the "open" position. The single-shaft ignition system has been improved so that only two knob rotations are required, making it easy for elderly people and children to operate.

[Example] Next, an explanation will be given based on an example shown in the ignition safety coin diagram for gas appliances of the present invention.

First, with respect to FIGS. 1 and 2, which explain the difference in the order of operation of the ignition control shaft knob between the conventional single-shaft ignition-operated gas appliance ignition safety device and the device of the present invention, D and E indicate the differences between the conventional device and the present device. The knobs a and b of the invention device are marks indicating the rotational position of the knob. Whereas the conventional device required three operations of the knob D from "stop" to "open," the operation of the present invention requires only two rotations. FIG. 3 is an operational system diagram of the components of the device of the present invention, showing a gas main valve 2 located at the gas supply port to the main burner F of the gas appliance downstream of the magnetic valve 1 provided at the gas inlet of the device. However, a pilot valve 3 for supplying gas to a pilot burner G, which serves as the source of the main burner F, is provided in close line with this gas flow path. In the immediate vicinity of the pilot burner G, there is a thermocouple I whose role is to supply electric power to keep the pilot burner spark plug H and the magnetic valve 1 open against the force of the built-in spring to close them. and are arranged. J is a piezoelectric igniter, and K is a governor.

FIG. 4 shows an electric circuit for opening and holding the magnetic valve 1. L is a magnet for attracting the valve body, N is a thermoswitch for its operation, and M is a galvanometer.

Next, referring to FIG. 5, which depicts a longitudinal section of the ignition safety device for gas appliances of the present invention when the ignition control knob E is in the "off" position, the ignition safety device serves as a gas flow path and forms the outer shell of the device. On the wall of the sealed casing 4, there is a gas introduction magnet valve 1 in contact with the gas inlet d, a gas main valve 2 in contact with the gas supply port e to the pilot burner F, and a gas supply port to the pilot burner G. A pilot valve 3 is provided in contact with f. An ignition operating shaft 5 through which three cams A, B, and C for opening and closing these three valves are inserted is assembled inside the casing 4, and a knob E is attached to the end of the shaft protruding from the casing 4. It is attached.

In the above-mentioned "stop" position, the magnetic valve 1, which has the role of opening and closing the gas inlet d, is operated by the spring g, the pilot valve 3 is operated by the spring h, and the gas main valve 2 is operated via the valve rod 6. The valve body is pressed against the valve seat by the acting force of the spring i, and the valve is placed in the closed state.

Figures 6 to 8 show P- in the "stop" position.
The cross sections of the P', Q-Q' and R-R' portions are shown, respectively.

Next, as seen in FIG. 1, when the ignition operating shaft 5 is rotated approximately 120 degrees counterclockwise, the groove cut in the ignition operating shaft 5 and the rotation stop pin 7 act to prevent the device from turning. The "ignition" position is set as seen in FIG. 9 as a longitudinal section. The cam A, which is rotated integrally with the ignition operating shaft 5, pushes a spindle as it rotates, and the spindle pushes the valve body of the magnetic valve 1 to open it. This spindle has a configuration in which a rod-shaped inner spindle 9 is partially fitted into a cylindrical outer spindle 8, and both the inner and outer spindles 8, 9 have a large diameter portion and a small diameter portion, respectively. They have a shape in which they are connected via cone-shaped slopes p and q, and in the slope gap of the opposing inner and outer spindles 8 and 9, there is always a force applied to the outside of this gap by the action of a spring j. A plurality of balls 10 which are about to be released are housed therein. Said hot cam A
The slope q of the inner spindle 9 pushed by the ball 1
0 is pressed by the acting force of spring j, the ball 10 is pressed against the slope p of the outer spindle 8, and the pair of spindles 8 and 9 work together as one to press the magnetic valve 1 and the action of spring g is applied. Open the valve against force. A piston 11 is mounted on the surface of the outer spindle 8 facing the magnetic valve 1, and the piston 11 is pushed outward from the cylinder by a spring k housed in the cylinder. Further, the outer spindle 8 is inserted through a bearing-like support 12 and supported so as to be slidable in the axial direction, and the inner spindle 9 is supported by a spring 1.
A force is always exerted on the cam A by the cam A. As a result, as the cam A rotates, the spindle is assisted by the buffering force or delay transmission force of the spring k and the spring 1, and applies an appropriate pressing force to the magnetic valve via the piston 11 in a timely manner. 1 will be informed.

On the other hand, as the cam B rotates, the pilot valve 3
is opened against the force of spring h. At this time, the piezoelectric igniter J operates in conjunction with the rotation of the ignition operating shaft 5 to ignite the pilot burner G, and as mentioned above, the thermocouple I placed close to the pilot burner G generates a thermoelectromotive force. As a result, the electromagnetic magnet built in the magnetic valve 1 is operated, and the magnetic valve 1 as a gas introduction valve is maintained in an open state regardless of the acting force of the spindle.

Cam B and cam C are pressed against each other by the force of a spring m, and cam B is slidable in the axial direction and is ignited by a rotation stop pin 13 installed in the ignition operating shaft 5. The cam C rotates integrally with the operating shaft 5, and the cam C is prevented from sliding in the axial direction by the inner wall surface of the casing 4.
Rotation around the axis is suppressed by a plate spring 14 that is pressed against the flat surface r or s of. Also, cam B
The contact surface between the cam C and the cam C is provided with an engagement surface that allows the two to move together only when the shaft rotates in one direction, and when the shaft rotates in the other direction, the cam C slides and pushes the cam B in the axial direction. A projection 15 and a fitting hole 16 for the projection 15 are provided, respectively.
When the ignition operating shaft 5 rotates counterclockwise from the "stop" position to the "ignition" position, the cams B and C are rotated integrally.

The valve rod 6, which is moved in the axial direction by the action of the spring i responsible for the closing operation of the gas main valve 2 and the spring n responsible for the opening operation of the gas main valve 2, is moved when the knob E is in the "stop" position. is set at the position where the gas main valve 2 is closed by the cam C (see Figures 5, 7, and 8), but when the knob E reaches the "ignition" position, the cam B The gas main valve 2 is opened by the claw piece 17 provided on the
is set to the position where the valve is closed (see FIGS. 9, 11, and 12).

Next, when the ignition operating shaft 5 is rotated approximately 30 degrees clockwise, the inner spindle 9 attempts to return to its original position, and the ball 10 is pushed to the outside of the above-mentioned sloped gap by the acting force of the spring j. The engagement force between the inner spindle 9 and the outer spindle 8 via the shaft 10 is lost, and only the outer spindle 8 is returned to its original state.

On the other hand, regarding the gas main valve 2, the cam C is prevented from moving around the shaft and in the axial direction by the presence of the plate spring 14, the wall of the casing 4, and the spring m, and the cam B is prevented from moving in the counterclockwise direction. Since it will rotate in the opposite direction, the cam C will be pushed toward the projection 15 without being blocked by the projection 15 provided on the cam C and having a reverse rotation prevention shape as shown in the perspective view in FIG. With this movement, the positioning force of the valve rod 6 by the claw piece 17 attached to the cam B is lost, and the valve rod 6 pushes the gas main valve 2 open by the stretching force of the spring N. The "open" position for igniting the main burner F is set. V- of the device in this state
The longitudinal sections of V', W-W' and X-X' are shown in FIGS. 14 to 16, respectively.

When the ignition operating shaft 5 is further rotated 90 degrees clockwise, it returns to the "stop" position, the cam B closes the pilot valve 3, and the cam C closes the main valve 2.
is closed and the pilot burner G is extinguished, the electromotive force of the thermocouple I disappears, the magnetic valve 1 loses its electromagnetic opening force, and is opened by the spring g.

FIG. 17 shows an exploded view of the main parts of the ignition system of the present invention, that is, the ignition operating shaft 5 through which the cams A, B and C are inserted, the spindles 8 and 9, and the valve rod 6. 18
2 is a cylinder-shaped stopper for regulating the movement of the ball 10; 19 is a cap nut serving as an end plate of the outer spindle 8; 20 is a mounting bracket for fixing the spindle support within the casing 4;
1 is an O-ring, 22 is a washer, and 23 and 24 are lids for closing an opening made in the casing 4 for assembling the spindles 8, 9 and the valve rod 6, respectively.

[Brief explanation of drawings]

FIGS. 1 and 2 are diagrams illustrating the operation order of the ignition operating shaft knob of a conventional single-shaft operated gas appliance ignition device and the device of the present invention, respectively, and FIG. 3 is a diagram illustrating the operation of the components of the device of the present invention. System diagram, Fig. 4 is an electric circuit diagram for maintaining the magnetic valve in the open state, and Fig. 5 is a vertical cross section of the device of the present invention with the ignition operating shaft set to the “stop” position. Figures 6 to 8 show P-P', Q-Q', and R at that time.
-R' partial cross-sectional view, FIG. 9 is a vertical cross-sectional view of the same set in the "ignition" position, and FIGS. 10 to 12 are the S-S', T-T', and U −
A cross-sectional view of the U' portion, FIG. 13 is a longitudinal cross-sectional view of the U' portion set in the "open" position, and FIGS. 14 to 16 are V-V', W-W', −
A cross-sectional view of the X' portion, and FIG. 17 is an exploded view illustrating the structure of the main parts of the device of the present invention. In the figure, 1...magnetic valve, 2...gas main valve,
3...Pilot valve, 4...Casing, 5...Ignition operation shaft, 6...Valve rod, 9...Spindle, 13
... Rotation stop pin, 14... Leaf spring, 15... Protrusion, 1
6...Fitting hole, 17...Claw piece, A, B, C...Cam, F...Main burner, E...Knob, G...Pilot burner, d...Gas inlet, e, f...Gas supply port, g, h , i, m, n... spring, I... thermocouple,
r, s...Flat surface.

Claims (1)

[Claims] 1. A gas inlet d opened in the casing 4;
A gas flow path is formed in the casing 4 by having the magnetic valve 1, the gas main valve 2, and the pilot valve 3 facing the gas supply port e leading to the main burner F and the gas supply port f leading to the pilot burner G, respectively. These cams A, B, and C for opening and closing the magnetic valve 1, the gas main valve 2, and the pilot valve 3
At the same time as inserting the knob E on the shaft end,
The "ignition" position achieved when knob E is rotated from the "stop" position by a first angle in a predetermined direction from the "stop" position, and only by a second angle smaller than the first angle from the "ignition" position. An ignition operating shaft 5 having an "open" position achieved when rotated in a counter-predetermined direction is assembled to a casing 4, and the magnetic valve 1 has a plate-shaped valve body moved from the gas inlet d side to the gas flow path inlet side. It has a spring g that presses against the casing, and the pilot burner G.
The gas main valve 2 is electrically connected to a thermocouple I placed near the gas flow path, and the gas main valve 2 includes a plate-shaped valve body located on the gas flow path side, a valve rod 6 into which the plate-shaped valve body is loosely inserted, and a valve rod 6 located on the gas flow path side. The pilot valve 3 has a spring n that urges the gas supply port f, and a spring i that presses the plate-shaped valve body against the gas flow path outlet side casing when the valve rod 6 is displaced in the direction of the gas supply port e. The cam A has a rod-shaped valve body that is loosely inserted into the gas flow path from the side, and a spring h that biases the rod-shaped valve body toward the gas flow path side, and rotates integrally with the ignition operation shaft 5.
The magnetic valve 1 side in the "ignition" position is formed with a large diameter, and is slidable in the axial direction, and the cam A
A rotation stop pin 13 is biased in the direction opposite to the cam A by a spring m loaded between the cam and the rotation stop pin 13, which has a fitting hole 16 and a claw piece 17 for pressing the valve rod 6, and is implanted in the ignition operating shaft 5. The cam B, which is rotationally driven by It has a protrusion 15 shaped to prevent reverse rotation that engages with the fitting hole 16, and flat surfaces r and S that prevent rotation around the axis are formed by pressure contact with the leaf spring 14 disposed in the casing 4. The cam C has a diameter larger than the main valve 2 side at the position where the flat surface r contacts the leaf spring 14. At the "stop" position, the magnetic valve 1 and the pilot valve 3 are closed, and the flat surface r The cam C, which presses against the leaf spring 14, presses the valve rod 6 and closes the main valve 2.
At the "ignition" position, where the valve is closed and the pilot burner G is ignited, the spindle 9, which is biased toward the cam A, is pressed by the cam A and the magnetic valve 1 is ignited.
The valve is opened, and the cam B, which is rotated by being pushed by the rotation stop pin 13, presses the rod-shaped valve element to open the pilot valve 3, and the pressure of the valve rod 6 is switched from the cam C to the claw piece 17, and the gas main Valve 2 remains closed,
In the "open" position where the pressure contact of the leaf spring 14 changes to the flat surface S and the main burner F ignites, the magnetic valve 1 is kept open by the thermoelectromotive force of the thermocouple I, and the projection of the cam C that is prevented from rotating This ignition safety device for gas equipment opens the gas main valve 2 by releasing the pressure on the valve rod 6 by the claw piece 17 when the cam B is attached and detached in the direction of the cam A by means of the cam B.