JP2756917B2 - Gas appliance thermal power control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling the power of a gas appliance, and more particularly to a device for controlling the power of a burner in which the burner does not misfire even if the operation is suddenly changed from a high heat to a low heat.

[0002]

2. Description of the Related Art In general, when gas is supplied to a burner of a gas appliance, the gas is injected from a nozzle into a mixing pipe connected upstream of the burner at a high speed, and the nozzle is ejected by the ejector effect of the gas. Ambient air is sucked into the mixing tube, and the gas and air are mixed at an appropriate ratio in the mixing tube to be supplied to the burner in a state of a gas mixture. In this type of gas appliance, the heating power is adjusted by controlling the gas injection amount to increase or decrease, but when the gas injection amount increases or decreases, the injection speed from the nozzle increases or decreases and the air suction amount also increases. It changes with the increase and decrease of the injection amount of. That is, if the gas injection amount decreases, the air suction amount also decreases, and conversely, if the gas injection amount increases, the air suction amount also increases, and the air-fuel ratio of the air-fuel mixture increases regardless of the gas injection amount. Be kept constant.

However, if the thermal power is rapidly adjusted, the air-fuel ratio may temporarily deviate from the normal value. In particular, when the heating power is rapidly reduced from high heat to low heat, the rate of gas decrease is faster than the rate of air decrease, the mixture ratio of gas to air is reduced, and the amount of air-fuel mixture itself is also reduced, resulting in burners. May cause a fire.

Conventionally, as a solution to such a problem, for example, Japanese Unexamined Utility Model Publication No. Hei 3-30052 discloses a method of providing a stopper for temporarily restricting the movement of a lever for adjusting the heating power in the middle of the movement locus of the lever. When the heating power is changed from high to low, the lever is temporarily stopped by a stopper,
After that, after the lever is lifted to release the restriction by the stopper, the lever is further operated in the low heat direction so that the lever is not operated from the high heat position to the low heat position at once.

[0005]

However, in the above-mentioned prior art, there is a problem that the operation of the lever is temporarily restricted by the stopper even when the lever is operated slowly and there is no risk of misfiring, and the operability is impaired.

SUMMARY OF THE INVENTION In view of the above problems, the present invention prevents a misfire when an operating member for adjusting a heating power such as a lever or a knob for adjusting a heating power is suddenly operated from a high-fire position to a low-fire position. It is an object of the present invention to provide a thermal power control device for a gas appliance that does not impair operability by restricting the movement of an operation member when operated at a speed that does not cause a misfire.

[0007]

In order to achieve the above object, an invention according to claim 1 is directed to a thermal power control device for a gas appliance provided with an operating member for controlling the amount of gas supplied to a burner to increase or decrease and control the thermal power. A stopper member which is movable in a direction intersecting the movement locus of the operating member and is urged to one side along the direction, and engages with the operating member when the operating member is in the high-fire position. An engaging portion for holding the member at a predetermined regulating position against the urging force, and a stopper member positioned on the movement trajectory of the operating member from the high-fire position to the low-fire position at the regulating position; And a stopper that retreats from the movement locus when moving in the direction.

According to a second aspect of the present invention, in the first aspect of the present invention, when the stopper portion retreats from the movement locus, the operating member enters the stopper member to secure the movement of the stopper member by the urging force. An escape portion and a recessed portion which is continuous with the escape portion and allows the operation member to move to the low fire position are provided.

According to a third aspect of the present invention, in the first or second aspect, the stopper member cooperates with the operating member at the beginning of the movement of the operating member from the high-fire position to move the stopper member from the restricted position. It is characterized by including a cam portion for temporarily moving in a direction opposite to the urging direction.

According to a fourth aspect of the present invention, in the first to third aspects, the stopper member is movable by a predetermined distance in the moving direction of the operating member.

[0011]

When the operation member is slowly operated from the high heat position to the low heat position, when the operation member moves from the high heat position, the engagement of the engaging portion with the operation member is released, and the stopper member moves from the regulating position to the biasing direction. And move. Then, the stopper retreats from the movement trajectory of the operation member, whereby the operation member can be directly operated toward the low heat position without being restricted from moving by the stopper. on the other hand,
When the operation toward the low heat position is performed rapidly, even if the engagement by the engagement portion is released, the operation member abuts on the stopper portion before the stopper member moves from the regulation position in the urging direction of the urging force, and the operation member Is restricted from moving to the low heat position. When the operating member comes into contact with the stopper portion and stops once, the stopper member moves in the urging direction from the regulation position during that time, and the stopper portion retreats from the movement locus of the operating member. And you will be able to move.

Incidentally, in order for the stopper to retreat from the movement locus of the operation member, the stopper must be moved by the urging force. An escape portion is provided so that the stopper member does not abut on the operation member during the movement, so that the movement is not hindered, and the stopper portion is reliably retracted from the movement locus. And
Since the operating member that has entered the escape portion must be further movable to the low fire position, a concave portion is continuously provided in the escape portion so that the operating member can move to the low heat position by advancing through the concave portion.

By the way, once the stopper member is moved in the direction opposite to the biasing direction by the cam portion, the movement of the stopper member changes from the movement in the reverse direction to the movement in the biasing direction, and further the regulating position is changed. It takes a long time to exceed, and when the operation member is suddenly operated, the operation member can be more reliably brought into contact with the stopper portion.

If the stopper member is not movable in the moving direction of the operating member, the length of the stopper member must be longer than the moving distance of the operating member from the high-fire position to the low-fire position. By allowing the operation member to move in the moving direction as described above, the stopper member can move while being engaged with the operation member, and the length of the stopper member can be moved by a distance from the high-fire position to the low-fire position of the operation member. Can be shorter. However, the moving distance of the stopper member is set such that the position at which the operating member comes into contact with the stopper portion and the operating member is temporarily stopped is closer to the low heat position of the operating member.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, reference numeral 1 denotes a thermal power control device for controlling the amount of gas supplied to a mixing pipe K located upstream of a burner. 1
2, the mixture is injected into the mixing pipe K through the nozzle N, and the mixture of ambient air and gas sucked by the ejector effect is supplied to the burner. In this device, when the fire extinguishing button 13 is pushed, the electromagnetic safety valve 15 opens,
Further, a well-known mechanism in which a main valve 16 is held open by a push-push mechanism 14.

To explain this further, the point fire extinguishing button 13
Sliding body 13 pushed against spring 13a by pushing operation
The rod 15a of the electromagnetic safety valve 15 and the rod 16a of the main valve 16 are pushed from the front end surface of b to open both the electromagnetic safety valve 15 and the main valve 16. Here, when the pressing operation on the fire extinguishing button 13 is released, the sliding body 13b is pushed back by the urging force of the spring 13a, but the locking pin 14b is locked at the intermediate locking position of the heart cam groove 14a formed on the sliding body 13b. Then, the sliding body 13b is temporarily locked at an intermediate locking position in the middle. At this time, the main valve 16 is in a valve-open state because the rod 16a is in contact with the distal end surface of the sliding body 13b.
On the other hand, the rod 15a of the electromagnetic safety valve 15 is separated from the distal end face, but is attracted and held by the thermoelectromotive force of a thermocouple (not shown). When the fire is extinguished, pressing the point fire extinguishing button 13 again causes the locking pin 14b to operate.
Is disengaged from the intermediate locking position of the heart cam groove 14a, and the sliding body 13b returns to the original position by the urging force of the spring 13a.
As a result, the main valve 16 is closed, so that the gas is not supplied to the burner and the fire is extinguished. Then, the thermoelectromotive force from the thermocouple disappears, and the electromagnetic safety valve 15 is not kept open and closed.

The control for increasing or decreasing the amount of gas supplied from the supply port 12 to the burner is performed by raising and lowering the thermal power control valve 17. A pin 17 a is projected from the thermal power control valve 17, and the pin 17 a is inserted into a long hole 19 formed in the guide plate 18 and extending obliquely in the oblique direction. Further, the thermal power control apparatus 1 is provided with a lever 2 which is an operation member pivotally supported by a fulcrum pin 21 so as to be swingable.
Is inserted also into a longitudinally long hole 22 formed in the lever 2. Therefore, when the lever 2 is swung, the pin 1
7a moves obliquely along the slot 19, and when the lever 2 is at the high heat position shown in FIG.
As the lever 2 is in the low heat position, the pin 17a is guided downward through the elongated hole 19, so that the heat control valve 17 is lowered. It is held in the low heat position.

The lever 2 is provided with a mechanism 3 for restricting an abrupt operation from a high heat position to a low heat position. The mechanism 3 includes a stopper member 31. The stopper member 31 is inserted into a long hole 34 formed in a bracket 33 by a support pin 32 protruding from one end of the stopper member 31, and the lever 2 is moved. In this embodiment, the lever 2 is slidable in the vertical direction with respect to the horizontal movement of the lever 2 and urged in the direction in which the other end is lowered by its own weight. Supported. Further, the elongated hole 34 is provided so as to be elongated in the moving direction of the lever 2, and accordingly, the stopper member 3 is provided.
Reference numeral 1 allows the lever 2 to move a predetermined distance in the moving direction, that is, a distance corresponding to the longitudinal dimension of the elongated hole 34. As shown in FIG. 3, the stopper member 31 is provided with an engagement portion 35 at the other end, and as shown in FIG.
When the other end of the stopper member 31 is about to go down due to its own weight, the engaging portion 35 is engaged with the lever 2 at the high-fire position, so that the stopper member 31 is held at the regulating position where the other end is being lowered. Is done. When the stopper member 31 is at the regulation position, a stopper portion 36 is provided so as to be located in the middle of the movement locus of the lever 2 from the high-fire position to the low-fire position, and the engaging portion 35 and the stopper portion are provided. The escape portion 37a is located between the engagement portion 35 and the stopper portion 36 and above the movement locus of the lever 2 in a state where the engagement portion 35 is engaged with the lever 2. A concave portion 37b is provided, which is continuous with the escape portion 37a and extends over the stopper portion 36.

According to the above configuration, when the lever 2 is rapidly operated toward the low heat position from the state where the lever 2 is at the high heat position and the stopper member 31 is held at the restriction position, as shown in FIG. Even when the engaging portion 35 is disengaged from the lever 2, the lever 2 comes into contact with the stopper portion 36 before the stopper member 31 starts swinging in a direction in which the other end is lowered by its own weight. The stopper member 31 is moved along the elongated hole 34 by the lever 2.
Together with the support pin 32 to the right
4 cannot move further at the position where it abuts on the right end of the lever 4, and the lever 2 can no longer be operated toward the low heat position. The length of the long hole 34 in the longitudinal direction is set so that the position where the lever 2 is temporarily stopped is short of the low heat position. Since the escape portion 37a is located above the lever 2 when the lever 2 is temporarily stopped in this manner, if the operation of the lever 2 is temporarily stopped in this state, the stopper is stopped as shown in FIG. The member 31 swings by its own weight in a direction in which the other end side is lowered. Then, the lever 2 can be operated from the escape portion 37a along the inside of the concave portion 37b, and can move to the low fire position as shown in FIG. When the lever 2 is slowly operated from the state shown in FIG. 3A, the stopper member 31 enters the escape portion 37a before the lever 2 comes into contact with the stopper portion 36, so that the stopper member 31 swings and moves forward of the concave portion 37b. Since the lever 2 is located, the lever 2 can proceed as shown in FIG. 4D, so that the lever 2 can be moved from the high-fire position to the low-fire position by a series of operations without being temporarily stopped halfway. At this time, the stopper member 31 has a recess 37b in the front end face in the moving direction of the lever 2.
Is moved to the right along the elongated hole 34 with the movement of the push lever 2. When the lever 2 is returned from the low heat position to the high heat position, the lever 2 comes into contact with the inclined portion 39, the stopper member 31 also returns to the left, and the stopper member 31 moves upward by the cooperation of the lever 2 and the inclined portion 39. When the lever 2 returns to the high heat position, the stopper member 31 also returns to the state shown in FIG.

In this embodiment, the stopper 36 of the engaging portion 35
The small protrusion 38 serving as a cam portion is bulged at the end on the side of the lever. When the lever 2 is suddenly operated, the stopper member 31 resists its own weight by the cooperation of the lever 2 and the small protrusion 38. After the lever 2 is disengaged from the engaging portion 35 and the stopper portion 36 is positioned on the movement locus, the lever 2 is reliably brought into contact with the stopper portion 36 by increasing the time. . In this case, since the stopper member 31 only needs to be once jumped upward by operating the lever 2 to the low heat position, the entire engaging portion 35 may be formed to be inclined rightward and downward in the figure. Further, the support pin 32 is
However, the support pin 32 moves in the elongated hole 34, whereby the length of the stopper member 31 in the longitudinal direction can be shortened. Note that the support pin may be fixed to the bracket 33 side and an elongated hole may be formed in the stopper member 31 so that the support pin is inserted through the elongated hole of the stopper member 31.

In the above embodiment, the case where the operating member for adjusting the heating power is the slide type lever 2 has been described. However, as shown in FIG. 4, the heating power adjusting device 4 for adjusting the heating power using the rotary operation knob 41 is provided. It can also be applied to The operation knob 41 adjusts the heating power from high heat to low heat by turning approximately 90 ° clockwise from the high heat position to the low heat position shown in the figure. In the present embodiment, a mechanism 5 similar to the above-described mechanism 3 is engaged with the claw piece 42 provided integrally with the operation knob 41 to restrict the sudden operation of the operation knob 41 to the low heat position. The mechanism 5 has a stopper member 51, and a support pin 52 projecting from one end of the stopper member 51 is connected to a support hole 5 of a bracket 53.
4 and the stopper member 51 is engaged with the engaging portion 55, the stopper portion 56, the escape portion 57a, the concave portion 57b, and the inclined portion 59.
Were each provided. However, as compared with the embodiment shown in FIGS. 1 to 3 described above, the difference is that the shapes of the engaging portion 55 and the concave portion 57 b are curved in accordance with the movement locus of the claw piece 42. Further, the support hole 54 for supporting the support pin 52 was not formed into an elongated hole because the movement distance of the claw piece 42 was relatively short. If necessary, the support hole 54 could be formed as an elongated hole. There is no inconvenience.

In both of the above embodiments, the stopper member is rotated by its own weight. However, the stopper member may be urged by an elastic body such as a spring or rubber. In this case, the stopper member can be brought into contact with the lever or the claw piece from below or from any other direction, thereby increasing the degree of freedom in designing the gas appliance.

The present invention may be applied to a type in which a fire is extinguished by a slide as an operation member of the thermal power control device and the lever or the operation knob. In this case, if an abrupt operation is performed from a high heat to a low heat, the operation is temporarily stopped by the stopper portion.

[0024]

As is apparent from the above description, according to the present invention, when the operating member for adjusting the heating power is rapidly operated from the high-fire position to the low-fire position, the operating member is temporarily stopped halfway. In addition to preventing misfiring at the burner, when operated slowly, the burner can be operated to a low heat position without being temporarily stopped, so that the operability of the operation member is not impaired.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the configuration of an embodiment of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a III-III sectional view for explaining the operation of the stopper member.

FIG. 4 is a perspective view showing the configuration of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermal power control device 2 Lever (for thermal power control) 3.5 ・ Mechanism for regulating sudden movement of lever 4 Thermal power control device 31 ・ 51 Stopper member 35 ・ 55 Engagement part 36 ・ 56 Stopper part 42 Claw piece

Claims (4)

(57) [Claims] An apparatus for controlling the power of a gas appliance, comprising an operating member for controlling the amount of gas supplied to the burner to increase or decrease the amount of gas supplied to the burner, the movable member being movable in a direction intersecting the movement locus of the operating member. An engagement portion that is provided with a stopper member that is urged to one side along with the operation member and engages with the operation member when the operation member is at the high-fire position to hold the stopper member at a predetermined regulation position against the urging force. , Located in the movement trajectory from the high fire position to the low fire position of the operating member in the regulation position,
And a stopper portion that retreats from said movement trajectory when said stopper member moves from said regulating position in said urging direction. 2. An escape portion for allowing the operation member to enter the stopper member when the stopper portion retreats from the movement trajectory and ensuring the movement of the stopper member by the urging force,
2. The apparatus according to claim 1, wherein the escape portion is provided with a concave portion that allows the operation member to move to the low fire position. 3. A cam portion for temporarily moving the stopper member from the regulation position in a direction opposite to the urging direction in cooperation with the operation member at the beginning of movement of the operation member from the high-fire position. The thermal power control device for gas appliances according to claim 1 or 2, further comprising: 4. The apparatus according to claim 1, wherein said stopper member is movable by a predetermined distance in a moving direction of said operating member.