JP2657529B2 - Ignition device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an ignition device for a gas heater or other gas combustors.

(Prior Art) Conventionally, there is provided an ignition operation lever which is pushed from an initial position through an intermediate position to an end position and is locked at the intermediate position, and is interlocked with the pushing operation of the ignition operation lever from the intermediate position to the end position. In this method, the energy is stored in a spring that strikes the hammer on the piezoelectric element, and then the hammer is hit on the piezoelectric element by the spring.
-26096.

(Problems to be Solved by the Invention) However, the gas valve is opened by operating the ignition operating lever from a start position to an end position, and the gas valve is opened by returning the ignition operating lever to an intermediate position. Is kept in a valve-open state.

For this reason, there is a danger that a large amount of raw gas will be released if there is a misfire.

An object of the present invention is to obtain an ignition device free of such a problem.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes an ignition operation lever which is pushed from a start end position through an intermediate position to an end position, and is temporarily locked at the intermediate position, The main valve is opened and held at the intermediate position of the ignition operating lever, and energy is accumulated in a spring that strikes a hammer on the piezoelectric element in conjunction with the pushing operation of the ignition operating lever from the intermediate position to the terminal position. When the hammer is hit on the piezoelectric element by a spring, the ignition operating lever is used to open the electromagnetic safety valve and the ignition pilot valve when the ignition operating lever is at the start position or the intermediate position. A fulcrum, which is a swing center when pushing the valve rod, is provided. When the ignition operating lever pushes the valve rod to open the electromagnetic safety valve and the ignition pilot valve, and continues to push the ignition operating lever, the valve is turned off. Rod The fulcrum is moved from the first position when the ignition operating lever is at the start position to the second position when the ignition operating lever is temporarily locked at the intermediate position. And the movement range of the fulcrum is shifted from the first position to the second
Move further past the position and beyond the second position,
When the fulcrum is switched from the first position to the second position, the electromagnetic safety valve and the ignition pilot valve are opened by pushing the ignition operation lever from each of the starting position and the intermediate position, and the ignition operation lever is opened. When the ignition operation lever is temporarily locked at the intermediate position by the release of the push operation, the ignition pilot valve is closed and the electromagnetic safety valve is in a valve-closable state, and interlocked with the movement of the fulcrum beyond the second position. The present invention is characterized in that the energy of a spring that strikes the hammer on the piezoelectric element is accumulated via the swinging lever that swings, and the hammer is hit on the piezoelectric element by the spring.

(Operation) In the ignition device having the above configuration, when the ignition operation lever is pushed down from the start end position to the end position side, the ignition operation lever first swings around the first position of the fulcrum to move the valve rod. Push. Thereby, the opening of the electronic safety valve and the ignition pilot valve starts. After the valve rod has been pushed and the electromagnetic safety valve and the pilot valve for ignition have been opened, if the ignition operation lever is further pressed, the ignition operation lever swings around the contact point with the valve rod to set the fulcrum at the fulcrum. The actuator is further moved from the first position beyond the second position, and in conjunction with the movement operation beyond the second position, energy is stored in a spring that strikes the hammer on the piezoelectric element, and the hammer is subsequently struck by the spring. For this reason, a relatively long valve opening time can be taken before the gas valve is opened near the start position and a hammer is hit on the piezoelectric element near the end position to obtain a spark, which is sufficient to expel air existing in the gas burner. After the gas amount is supplied to the gas burner, a spark by the piezoelectric element can be obtained, and the ignition can be improved.

Then, when the pushing operation of the ignition operating lever is released at the end position, the ignition operating lever is temporarily locked at an intermediate position, the ignition pilot valve is released by releasing the pushing, and the electromagnetic safety valve can be closed. State.

However, when the ignition pilot burner and the main gas burner are ignited by the above operation, the electromagnetic safety valve is kept open by the electromotive force of the thermocouple facing the gas burner.

Accordingly, gas is supplied to the main gas burner to connect the combustion. However, if an ignition error occurs, the electromagnetic safety valve is closed because the electromagnetic safety valve is not held open. Therefore, no gas is supplied to each gas burner.

In this case, if the ignition operating lever is moved from the intermediate position to the end position again, the ignition pilot valve and the electromagnetic safety valve are pushed open again, and the above-described ignition operation of generating a spark by hitting a hammer on the piezoelectric element can be performed. I can do it.

When the ignition operating lever is temporarily locked at the intermediate position,
The fulcrum of the ignition operating lever switches to the second position. For this reason, the ignition pilot valve and the electromagnetic safety valve can be pressed and opened, and the hammer can be prepared to strike the piezoelectric element in the same manner as when pushing down from the start end position to the end position.

(Example) An example of the present invention will be described with reference to a separate drawing. In the drawing, reference numeral 1 denotes an ignition operating lever which is pushed from a starting end position A through an intermediate position B to an end position C and is temporarily locked at the intermediate position B, and 2 denotes an ignition operating lever from the intermediate position B of the ignition operating lever 1 to an end position C. A piezoelectric element device for accumulating energy in a spring 5 for hitting the hammer 4 on the piezoelectric element 3 in conjunction with the pressing operation of the piezoelectric element 3 and subsequently hitting the piezoelectric element 3 of the hammer 4 by the spring 5 is a main gas burner 7. The valve housings 9 and 10 are provided with a gas passage 8 connected to the gas passage 8 and the like, and represent an electromagnetic safety valve and an ignition pilot valve facing the gas passage 8 in the valve housing 6. The electromagnetic safety valve 9 and the ignition pilot valve 10 are valve rods. The ignition operating lever 1, which is linked with the ignition operating lever 1 so as to be pushed and opened only when the ignition operating lever 1 is pressed via the valve 10a, opens the valve rod 10a to open the electromagnetic safety valve 9 and the ignition pilot valve 10. Oscillation when pushing When the ignition operating lever 1 pushes down the valve rod 10a to open the electromagnetic safety valve 9 and the ignition pilot valve 10 and continues to push the ignition operating lever 1 further, the contact between the ignition operating lever 1 and the valve rod 10a is provided. When the ignition operation lever 1 is temporarily locked at the intermediate position B, the fulcrum is moved from the first position a where the ignition operation lever 1 is at the start end position A to the second position. b, and the range of movement of the fulcrum can be further moved past the second position b starting from the first position a and passing the second position b. When the fulcrum is switched from the first position a to the second position b, the electromagnetic safety valve 9 is connected to the electromagnetic safety valve 9 via the valve rod 10a by pushing the ignition operation lever 1 from each of the starting end position A and the intermediate position B. When the ignition operation lever 1 is temporarily locked at the intermediate position B by pressing and opening the pilot operation valve 10a and releasing the operation of the ignition operation lever, the ignition pilot valve 10a opens and the electromagnetic safety valve 9 operates. A spring that is in a valve-openable state and that accumulates energy of the spring 5 that strikes the hammer 4 on the piezoelectric element 3 via the swing lever 28 that swings in conjunction with the movement of the fulcrum beyond the second position b. And hitting of the hammer 4 to the piezoelectric element 3 by the above method. 9a is the electromagnetic safety valve 9
Indicates a valve-closing spring for resiliently popping the ignition pilot valve 10 to the valve-opening side.

These will be described in further detail.
As shown in Fig. 10 and Fig. 11, gas burners 7,7
The lower gas burner is used as the main gas burner 7 for normal fire, the upper gas burner is used as the main gas burner 7 for switching the capacity, and the ignition pilot burner 11 and the electromagnetic safety valve 9 facing the main gas burner 7 for normal fire. A case where the present invention is applied to a heater provided with a normal-fire pilot burner 13 facing a thermocouple 12 for holding the valve open. For this reason, the electromagnetic safety valve 9 and the ignition pilot valve 10 are interposed in the valve housing 6 from a position near the gas inlet 14 of the valve housing 6 as shown in FIGS. A gas pressure control valve 15, a main gas valve 16, and a switching valve 17 for turning on and off the supply to the capacity switching gas burner 7 are provided. A gas outlet 18 to the pilot pilot burner 13 on the downstream side, a gas outlet 19 to the pilot pilot burner 11 on the downstream side of the pilot pilot valve 10, and a fire outlet on the upstream side of the switching valve 17. A gas outlet 20 to the gas burner 7 and a gas outlet 21 to the capacity switching gas burner 7 upstream of the switching valve 17 are provided.

The electromagnetic safety valve 9 is provided on an extension of the valve rod 10a of the ignition pilot valve 10 as shown in FIG. 4, and when the ignition operation lever 1 presses and opens the ignition pilot valve 10, the valve is opened. The electromagnetic safety valve 9 is pushed and opened by being pushed by the rod 10a. To explain this further, the ignition operation lever 1 has an L-shape as shown in FIGS. 7 and 8, one side of which is an operation piece 1a and the other side is an operation piece 1b. Valve rod 10 of pilot valve 10 for ignition
The ignition operating lever 1 is provided so as to be supported by a frame 22 provided on the front surface of the valve housing 6 so as to face the side a. The ignition operation lever 1 is supported on the frame 22 by the action piece 1b of the ignition operation lever 1.
The ring piece 23 provided on the frame 22 is loosely fitted to the pin 24 provided on the frame 22, and the pin 25 serving also as a fulcrum provided on the bent portion of the ignition operating lever 1 is provided near the pin 24 provided on the frame 22. The annular piece 23 is provided so as to be fitted into an arc groove 26 having the center, and the ring piece 23 is attached to the valve rod 10a.
, And this is pressed and opened. In addition, 27
Indicates a spring that pulls the ignition operation lever 1 toward the start end position A.

As shown in FIG. 2, the piezoelectric element device 2 is provided so as to be supported by a transparent window 22a provided in the frame body 22 so that the hammer 4 moves substantially along the moving direction of the pin 25, and Body 2
2 is provided with a swinging lever 28 which pivotally supports a root portion and whose tip faces the movement locus of the hammer 4. The pin 25 of the ignition operating lever 1 is fitted into an engagement groove 28 a provided in the swinging lever 28. The hammer 4 is linked to the operation of the ignition operating lever 1.

Thus, as shown in FIG. 2, when the ignition operation lever 1 is pushed down from the start position A to the end position C, the ignition operation lever 1 is first swung about the upper end device of the arc groove 26, that is, the first position a. The ring 23 moves as shown in FIGS.
When the ignition pilot valve 10 and the electromagnetic safety valve 9 are pressed and opened via the valve rod 10a and the valve rod 10a is pushed off, the ignition operating lever 1 is brought into contact with the ring piece 23 and the valve rod 10a. Swing about the fulcrum. As a result, the pin 25 moves down along the arc groove 26, the tip of the swinging lever 28 engages the hammer 4 at the intermediate position B, and the ignition operating lever 1 is subsequently pushed down. Then, the spring 5 is compressed and contracted via the hammer 4 and then the hammer 4 is separated from the piezoelectric element 3.
Then, the engagement of the swing lever 28 with the hammer 4 is released near the end position C of the ignition operation lever 1. Therefore, the hammer 4 is hit by the spring 5 and strikes the piezoelectric element 3. For this reason, a spark is generated at the electrode of the piezoelectric element 3 to ignite the gas burner.

When the depression of the ignition operation lever 1 is released at the end position C, the ignition pilot valve 10 is released and the valve closes, and the electromagnetic safety valve 9 becomes a valve-closable state and the ignition operation lever 9 is closed. 1 is temporarily locked at the intermediate position B.

At this time, as shown by a chain line in FIG. 2, the swinging lever 28 is in a state of being locked to the front end side of the hammer 4,
The pin 25 also serving as a fulcrum of the ignition operating lever 1 is maintained at the second position b (shown by a chain line in FIG. 2) whose position is regulated by the swing lever 28.

Therefore, when the ignition operating lever 1 is pushed down again from the intermediate position B to the end position C due to an ignition mistake, the ignition operating lever 1 first swings around the second position b, and the ring The valve rod 10a is pressed by the piece 23 to press and open the ignition pilot valve 10 and the electromagnetic safety valve 9, and the position where the ring piece 23 comes into contact with the valve rod 10a is centered at the position where the valve rod 10a is pressed off. Then, the ignition operation lever 1 is further swung. For this reason, the hammer 4 can be separated from the piezoelectric element 3 by pressing the spring 5 by pressing the spring 5 by the swinging lever 28, and then, the hammer 4 can be struck against the piezoelectric element 3 to perform an ignition operation for generating a spark on the electrode. .

That is, when the pin 25 constituting the fulcrum moves to the second position b, the ignition pilot valve 10 and the electromagnetic valve are also moved from the intermediate position B to the end position C in the same manner as when the pin 25 is pushed down from the start position A to the end position C. According to the movement beyond the second position b, the safety valve 9 can be pressed and opened, and the hammer 4 can be hit on the piezoelectric element 3 to generate a spark between the electrodes and ignite.

As shown in FIGS. 7 and 8, the ignition operating lever 1 has a sub-lever 29 which moves with the ignition operating lever 1 and a lock pin 30 which temporarily locks the operating lever 1 at the intermediate position B.
When the hook 31a of the lock plate 31 is engaged with the lock pin 30, the ignition operating lever 1 is temporarily locked at the intermediate position B. The auxiliary lever 29 and the lock plate 31 are provided so as to be pivotally supported by the pin 24 on which the ring piece 23 provided on the ignition operation lever 1 is loosely fitted.

The cam 29a is attached to the sub lever 29 as shown in FIG.
A push piece 32 for pressing the main gas valve 16 against the cam 29a.
The ignition operation lever 1
When operating from the start end position A to the end position C side of the
Thus, the main gas valve 16 is moved to the valve opening side.

Further, the sub lever 29 is provided with a protruding piece 29b that overlaps with a hook portion 31a provided on the lock plate 31. The lock plate 31 is provided at its front end with a claw piece 31b facing the front surface of the sub-lever 29. When the ignition operation lever 1 is moved to the end position C, the lock plate 31 is pushed by the sub-lever 29 and is integrated. In addition, a tension spring 33 is interposed between the auxiliary lever 29 and the lock plate 31, and the ignition operation lever 1 is temporarily stopped at the intermediate position B so that the ignition operation lever 1 is started. When applying force to return to the side, first, the operating piece 1b of the ignition operating lever 1
29, and slightly returns it to the start position A side. At this time, the protruding piece 29b disengages the lock pin 30 engaged with the hook 31a from the hook 31a against the spring 42. Press in the direction you want. As a result, when the lock pin 30 comes off from the hook 31a, the auxiliary lever 29 is pushed by the main gas valve 16 and the lock plate 31 is released.
With this, it returns to the start end position A side.

The lock pin 30 is formed by bending a small-diameter metal wire into a U-shape, having one side 30a pivotally supported by the frame 22 and the other free end 30b being pulled by a spring 42 to form the hook 31a. It is provided so as to enter the inside. The spring 42 is formed by bending a metal wire 42a having a spring property into an annular shape so that both ends of the metal wire 42a partially overlap with each other, and bending both ends of the metal wire 42a inward to engage with the lock pins 30. It was formed small and flat with 42b, 42b.

Reference numeral 35 denotes an L-shaped switching lever for switching the switching valve 17, and reference numeral 36 denotes a switching lock plate that moves along with the switching lever 35 and locks the switching lever 35 at a switching position.
A bent piece that presses the switching valve 17 to one end of the switching lock plate 36
The switching lock plate 36 is provided at the other end with a bent portion 36c that engages with the pressing piece 35b of the switching lever 35. The switching lock plate 36 is supported by the pin 24 to push the switching lever 35. It is provided so as to move overlapping with the piece 35b.

Further, the switching lock plate 36 is provided with a hook 31a which engages with a locking pin 37 similar to the lock pin 30 at the switching position.

When swinging the switching lever 35 to the switching position, the pressing piece 35b hits the bent portion 36c, and the switching lock plate 36 also swings,
In the switching position, the switching lock plate 36 has its hook portion 36a having the locking pin 3
7, which keeps the switching lever 35 in the switching position. Then, when returning the switching lever 35 from the switching position to the original position, first, the locking pin 37 engaging with the hook portion 31a is pushed out by the pressing piece 35b, and the locking pin 37 is pushed out from the hook portion 31a, The switching lock plate 36 is returned to the original position along with the switching lever 35.

Reference numeral 38 denotes a tension spring that pulls the switching lever 35 toward the original position side, and reference numeral 39 denotes a root that is supported by the frame 22 and the tip of which is the ring piece 23.
A plate piece interposed between the ignition lever 1a and the valve rod 10a for stabilizing the pressing of the valve rod 10a by the ignition operation lever 1; and a stopper for locking the switching lever 40 in its original position. Rubber material at the position where 35 comes into contact with the stopper 40
41 was attached to soften the collision sound generated at the time of contact.

The spring 27 and the tension spring 38 described above are brought into contact with the frame 22 or the switching lever 35 at the middle thereof,
38 is prevented from vibrating. Reference numeral 43 denotes a rubber material for absorbing a collision sound, which also functions as a stopper provided on the frame 22 with which the ignition operating lever 1 contacts.

 Next, the ignition operation of the present apparatus will be described with reference to FIG.

As apparent from FIG. 9, the ignition operating lever 1 swings over a range of about 60 degrees from the start position A to the end position C, and the ignition operation lever 1 at the start position shown in FIG. When the ignition operating lever 1 is depressed, the pin 25 also serving as a fulcrum keeps the first position a.
The electromagnetic safety valve 9 starts to be opened via a, the ignition pilot valve 10 is opened at the position c in FIG. 9, and the electromagnetic safety valve 9 is pushed off at the position d in FIG. To keep the main gas valve 16 pushed open by the gum surface 29a provided on the sub lever 29 described above.

That is, the gas is supplied to the ignition pilot burner 11, the normal fire pilot burner 13, and at least the normal fire main gas burner 7 when the ignition operation lever 1 is pushed down by about 1/4 of its operation range. After passing through the intermediate position B shown in FIG. 9f, the pin 25 also serving as the fulcrum moves along the circular groove 26. The swinging lever 28 swinging with this engages with the hammer 4 and presses and compresses the spring 5 to push the hammer 4 away from the piezoelectric element 3, and the swinging lever 28 is moved at the position shown in FIG. The engagement between the moving lever 28 and the hammer 4 is released.

Therefore, the hammer 4 strikes the piezoelectric element 3 to obtain sparks on the electrodes and ignite the burners 11, 13 and 7.

When the depression of the ignition operation lever 1 is released at the end position C shown in FIG. 9h, the ignition operation lever 1 is moved to the start end position A.
In the middle of returning to the side, the lock plate 31 and the lock pin 30 are locked at the intermediate position B (the position shown in FIG. 9i). As a result, the ignition pilot valve 10 is released by the spring 34 to release its pressure, and returns to the open position.
Is held open by the electromotive force of the thermocouple 12. Therefore, the gas is continuously supplied to the normal-fire pilot burner 13 and at least the main-fire burner 7 to continue combustion.

However, if the ignition is not performed during the ignition operation, no electromotive force is generated in the thermocouple 12, so that the electromagnetic safety valve 9 is not sucked and held, so that the electromagnetic safety valve 9 is closed.

Therefore, the supply of gas to all the gas burners 11, 13, and 7 is cut off.

At this time, by pushing down the ignition operating lever 1 from the intermediate position B to the terminal position C, the ignition pilot valve 10 and the electromagnetic safety valve 9 are again pressed and opened as described above, and the hammer 4 is connected to the piezoelectric element. An ignition operation for hitting No. 3 is performed. At this time, the operation of the ignition operation lever 1 can be performed in a small operation range from the intermediate position B to the end position C, and thus the operability is good.

(Effect of the Invention) As described above, according to the present invention, when the ignition operation lever is pushed from the start position to the end position, the ignition pilot valve and the electromagnetic safety valve are opened from the start position when the ignition operation lever is pushed, Since a spark can be obtained by hammering the piezoelectric element near the end position, a relatively long time can be taken between opening the ignition pilot valve and the electromagnetic safety valve and obtaining the spark, and it can be taken into the gas burner. After supplying a sufficient amount of gas to the gas burner to expel the existing air, a spark is obtained and ignited to improve the ignitability, and when the ignition operation lever is released, the ignition pilot valve is closed. Since the electromagnetic safety valve can be closed, there is no danger of fuel gas flowing out even if an ignition error occurs.If an ignition error occurs, the ignition operation is performed by re-operation from the intermediate position to the end position. The operation range is smaller than that of the first time, so that the operation becomes easier.In particular, the ignition operation lever is used when the electromagnetic safety valve and the ignition pilot valve are pressed and opened, and when the hammer is applied to the piezoelectric element. Different fulcrums (pins 25) are used to cause the energy of the spring to be driven to accumulate and the hammer to be hit on the piezoelectric element by the spring.
(The point at which the valve rod 10a and the ignition operating lever 1 contact each other when the ignition operating lever 1 is fully pushed). Therefore, after the electromagnetic safety valve and the ignition pilot valve are pushed completely, the hammer is moved to move the piezoelectric element. The spring that strikes the hammer allows sufficient energy to be stored, and then the hammer can strike the piezoelectric element.

[Brief description of the drawings]

1 is a plan view showing an embodiment of the present invention, FIG. 2 is a right side view thereof, FIG. 3 is a sectional view taken along the line III-III of FIG.
5 is a sectional view taken along the line IV-IV, FIG. 5 is a sectional view taken along the line VV in FIG. 2, FIG. 6 is a left side view, FIG.
FIG. 9 is an exploded perspective view of the ignition operating lever portion, FIG. 9 is an explanatory diagram for explaining the operation thereof, FIG.
FIG. 11 is an enlarged front view of a part thereof. 1 ... Ignition operating lever, 3 ... Piezoelectric element 4 ... Hammer, 5 ... Spring 9 ... Electromagnetic safety valve, 10 ... Pilot valve for ignition

Claims (1)

(57) [Claims] An ignition operating lever which is pushed from a start end position to an end position via an intermediate position and is temporarily locked at the intermediate position, and the main valve is opened and held at an intermediate position of the ignition operation lever; In accordance with the operation of pushing the ignition operating lever from the intermediate position to the terminal position, energy is accumulated in a spring that strikes the hammer on the piezoelectric element, and then the hammer strikes the piezoelectric element by the spring. In this case, the ignition operation lever includes a fulcrum serving as a swing center when the valve rod is pushed to open the electromagnetic safety valve and the ignition pilot valve, and the ignition operation lever pushes the valve rod off. When the ignition operation lever is kept pressed after opening the electromagnetic safety valve and the ignition pilot valve, the ignition operation lever is pivoted about the contact point with the valve rod. When locked, dot The operation lever is switched from the first position to the second position when the operation lever is at the start end position, and the movement range of the fulcrum is such that the fulcrum can move further from the first position through the second position and beyond the second position. When the fulcrum is switched from the first position to the second position, the electromagnetic safety valve and the ignition pilot valve are opened by pushing the ignition operation lever from each of the start position and the intermediate position, and the ignition operation lever is opened. When the ignition operation lever is temporarily locked at the intermediate position by releasing the push operation of
The ignition pilot valve is closed and the electromagnetic safety valve is in a valve-closable state, and a spring that strikes the hammer on the piezoelectric element via a swing lever that swings in conjunction with movement of the fulcrum beyond the second position. Characterized in that the energy is stored and the hammer is hit on the piezoelectric element by a spring.