JP2826951B2 - 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 thermal power control apparatus for a gas appliance provided with a throttle valve for increasing or decreasing the amount of gas supplied to a burner by reciprocating between a high heat position and a low heat position.

[0002]

2. Description of the Related Art Generally, when gas is supplied to a burner of a gas appliance, the gas is injected from a nozzle at a high speed into a mixing pipe located on the upstream side of the burner, and the gas is injected around the nozzle by an ejector effect by the injection of the gas. Is sucked into the mixing pipe, and the gas and air are mixed at an appropriate ratio in the mixing pipe to be supplied to the burner in a state of an air-fuel mixture. In such a type of gas appliance, the heating power is adjusted by increasing or decreasing the gas injection amount. However, when the gas injection amount increases or decreases, the air suction amount also changes. 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, in order to solve such a problem, for example, Japanese Unexamined Utility Model Publication No. Hei 3-30052 discloses a throttle valve for controlling the amount of gas supplied to a burner to increase or decrease. A stopper for forcibly temporarily stopping the movement of the lever in the low heat direction is provided in the middle of the movement trajectory of the lever, and when the heating power is switched from high to low, the lever is temporarily stopped by the stopper, and then the lever is lifted to stop. Is known in which the operation is further performed in the low heat direction after the stop due to the lever is released, so that the lever is not operated at once from the high heat position to the low heat position.

[0005]

However, in the above-mentioned prior art, there is a problem that the operation of the lever is temporarily stopped by the stopper even when the lever is operated slowly and there is no risk of misfiring, thereby impairing the operability in adjusting the thermal power. .

In view of the above problems, the present invention has been made in consideration of the above problem, and even when the operating mechanism for adjusting the heating power is suddenly operated to the low fire side, the movement of the operating mechanism is not stopped temporarily without stopping the operation of the burner. An object of the present invention is to provide a thermal power control device for gas appliances that can prevent misfire.

[0007]

To achieve the above object, a first aspect of the present invention is a gas appliance for adjusting a gas flow rate by reciprocating a throttle valve between a high heat position and a low heat position by an operating mechanism. In the thermal power control device, the operation mechanism may be configured such that movement of the throttle valve to the low-fire position is regulated at a predetermined position corresponding to the operation position of the operation mechanism, and at least the low-fire operation position of the operation mechanism is lower than the low-fire position. The throttle valve is configured to be movable over a position where the thermal power is strong, and an urging means for urging the throttle valve toward the low heat position and a regulating means for restricting a high speed movement of the throttle valve to the low heat position are provided. It is characterized by having.

According to a second aspect of the present invention, in the first aspect of the present invention, a projection perpendicular to the reciprocating direction is formed on the throttle valve.
An inclined portion which is inclined by a predetermined angle with respect to the reciprocating direction and is in contact with the projection when the throttle valve moves to the low-fire position is provided, and the inclined portion is used as a regulating means.

According to a third aspect of the present invention, in the first aspect of the present invention, the restricting means comprises a fixed member opposed to the throttle valve with a sliding clearance and a viscous material filling the sliding clearance. It is characterized by comprising.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the regulating means comprises an intermediate member facing the throttle valve with a sliding clearance, a viscous body filling the sliding clearance and the intermediate member. And a fixing member for holding the member, and the urging means is provided on the intermediate member.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the intermediate member is movable in a direction perpendicular to a sliding direction of the throttle valve.

According to a sixth aspect of the present invention, in the fourth aspect of the present invention, the intermediate member is movable along the sliding direction of the throttle valve, and a reaction force acting on the intermediate member from the urging means. A stopper for stopping the intermediate member in the middle of movement is provided.

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, a differential member having a sliding clearance for both is provided between the intermediate member and the throttle valve, so that the differential member is different from the throttle valve. The intermediate member is provided with a second biasing means for biasing the throttle valve toward the low-fire position via the differential member while filling the sliding clearance between the moving member with the viscous body, and An engaging means for engaging and stopping sliding of the differential member with respect to the intermediate member is provided.

[0014]

Since the throttle valve is urged toward the low heat position by the urging means, when the operating mechanism is suddenly operated to the low heat operation position, the throttle valve tends to move to the low heat position by the urging means. When the throttle valve moves to the low-fire position, the high-speed movement is regulated by the restricting means. Therefore, the throttle valve cannot follow the operation speed of the operation mechanism, and at least when the operation mechanism reaches the low-fire operation position, The throttle valve has reached only a position where the thermal power is stronger than the low fire position. In the state where the high-speed movement is regulated by the regulating means from the position, the urging force by the urging means moves to the low-fire position, whereby the rate of decrease of the gas is slowed and the misfire in the burner is prevented.

The restricting means may be of any type as long as it restricts the high-speed movement of the throttle valve. For example, according to the configuration shown in claim 2, when the throttle valve moves toward the low heat position, The protrusion comes into contact with the slope, and a frictional force is generated between the protrusion and the slope with the movement of the throttle valve to the low heat position,
The speed is reduced by the frictional force and the high-speed movement of the throttle valve is regulated.

Alternatively, when the restricting means is constituted by a fixed member and a viscous body filling the sliding clearance, a shear stress acts on the viscous body due to the movement of the throttle valve, and the viscous body is dashed. Acts as a pot. That is,
Since the force acting on the throttle valve in the deceleration direction from the viscous body increases in proportion to the moving speed of the throttle valve, even if the throttle valve is rapidly moved toward the low ignition position by the urging force of the elastic means. The throttle valve is braked by the force in the deceleration direction by the viscous body, and slowly moves toward the low heat position.

By the way, as described in claim 4, an intermediate member may be provided separately from the fixing member, and the fixing member, the intermediate member and the viscous body may constitute a regulating means.
If the intermediate member is allowed to move as described in claim 5, the displacement of the throttle valve with respect to the fixed member can be absorbed by moving the intermediate member with respect to the fixed member.

Further, in the configuration according to the sixth aspect, when the operating mechanism is rapidly operated to the low heat operation position, the intermediate member slides toward the low heat position side of the throttle valve integrally with the throttle valve by viscous force of the viscous body. As a result, the operation mechanism can be operated lightly. Then, after that, the intermediate member is slid toward the high-fire position side of the throttle valve and returned by the reaction force of the urging means, and thereafter, when the movement of the intermediate member is stopped by the stopper, the urging force of the urging means is all. It acts on the throttle valve and slowly moves to the low heat position with the high-speed movement restricted by the restricting means.

The restricting force by the restricting means also acts when the throttle valve is returned from the low heat position to the high heat position. Therefore, a differential member is provided as described in claim 7, and the differential member moves relative to the intermediate member together with the throttle valve by the restricting force of the restricting means acting when the throttle valve moves to the high-fire position. The throttle valve is moved to the high ignition position only by the operation force that can withstand the second urging force.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a thermal power control device for controlling the amount of gas supplied to a mixing pipe 42 located upstream of a burner. It is configured to inject into the mixing pipe 42 via 41 and to supply a mixture of ambient air and gas sucked by the ejector effect to the burner. This device is a well-known device in which when a fire extinguishing button 13 for performing a fire extinguishing of a burner is pressed, an electromagnetic safety valve 15 is opened, and a main valve 16 is kept 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 of the amount of gas supplied to the burner from the supply path 12 is controlled by raising and lowering the throttle valve 17. When the throttle valve 17 rises, the gas passage area of the portion where the throttle valve 17 is provided increases, and conversely, when the throttle valve 17 descends, the passage area decreases. The throttle valve 17 is provided with a pin 17a projecting therefrom. The pin 17a is inserted through a cam window 19 formed in a guide plate 18 which is a fixed member, and the throttle valve 17 is contracted between the throttle plate 17 and the guide plate 18. It is urged downward by the spring 3 which is the urging means. The thermal power control device 1 is provided with a lever 2 pivotally supported as an operating mechanism by a fulcrum pin 21, and the pin 17 a is a longitudinally long groove formed in the lever 2. 22 is also inserted.

The shape of the cam window 19 is shown in FIG. 2. When the lever 2 is in the high-fire operating position and the pin 17a is in the position a corresponding to the high-fire position of the throttle valve 17, the lever 2 is slowly heated. When operated to the operation position, one side edge 22b of the long groove 22 moves the pin 17a to the left in the drawing. At this time, since the throttle valve 17 is urged downward by the spring 3, the pin 17a moves along the oblique side b of the cam window 19, and when the lever 2 is operated to the low fire operation position, the low fire position of the throttle valve 17 is set. To the position c corresponding to. However, when the lever 2 is suddenly operated from the high-fire operation position to the low-fire operation position, the throttle valve 17 is urged downward by the spring 3, but the pin 17a passes through a trajectory away from the hypotenuse b to the side edge 22b. When the pushed pin 17a comes into contact with the vertical side e of the cam window 19 and the lever 2 is operated to the low heat operation position, it passes the position c and reaches the position g on the high heat side of the throttle valve 17 from the low heat position, Thereafter, the hypotenuse d, which is a restricting means, is
C corresponding to the low-fire position of the throttle valve 17 while abutting on
Descend to At this time, the pin 17a is decelerated by the frictional force generated between the pin 17a and the hypotenuse d, and reaches the point c relatively slowly without descending at a high speed. When the pin 17a moves from the position d to the position c and slightly returns in the horizontal direction, the escape portion 22d is inclined below the long groove 22 so that the side edge 22b of the lever 2 does not hinder the return operation of the pin 17a. Formed. That is, although the throttle valve 17 is urged downward by the spring 3, the urging force is not strong enough to move the lever 2, and thus the relief portion 22d is formed. The lever 2 is not moved by the spring 3 even if the hand is released from the lever 2 in a state where the lever 2 is in contact with the oblique side b. By the way, the oblique side 22a is formed when the lower part of the long groove 22 is inclined, but the oblique side d of the cam window 19 is formed.
And the oblique side 22a may be used as a regulating means. In order to change the heat from low heat to high heat, the lever 2 is operated from the low heat position to the high heat position.
a is pushed by the other side edge 22c of the long groove 22 and the hypotenuse b
Along the line to the position a.

Further, as shown in FIG. 3, the oblique side b of the cam window 19 can function as a regulating means. In this case, it is sufficient that a portion corresponding to the other side edge 22c of the long groove 22 is provided.
Attempts to descend along the hypotenuse b, but moves the pin 17a to the position c while holding the movement of the pin 17a by the side edge 22c, the lever 2 is rapidly operated from the high-fire operation position to the low-fire operation position, and the side edge 22c is moved. Pin 17 when moving to the left rapidly
a is moved while being decelerated by the frictional force caused by the contact with the hypotenuse b.

In each of the above embodiments, the restricting means is constituted by a hypotenuse. However, as shown in FIG.
1, a cylindrical projection 32 is provided on the head of the throttle valve 17, and the cylindrical projection 32 is inserted into the cylindrical portion 31 so as to have a sliding clearance 33. Further, an adhesive grease is attached to the sliding clearance 33. And the regulating means may be constituted by the cylindrical portion 31 and the adhesive grease. In this case, since the oblique side does not need to be used as the restricting means, the shape of the cam window 19 may be as shown in FIG. 5, and the long groove 22 may not be provided with the relief 22d.

According to this configuration, when the lever 2 is slowly operated from the high-fire operation position to the low-fire operation position, the pin 17a is pushed by the one side edge 22b as shown in FIG. It moves from the position a corresponding to the high-fire operation position of the lever 2 to the position c corresponding to the low-fire position of the throttle valve 17 along the hypotenuse b, but moves away from the hypotenuse b when the lever 2 is rapidly operated. Pin 17a through the track
Moves to a position g corresponding to a position where the heating power is higher than the low-fire position of the throttle valve 17 at the low-fire operation position of the lever 2 in contact with the vertical side e, and then descends to a position c corresponding to the low-fire position by the urging force of the spring 3. I do. At this time, a deceleration force by the adhesive grease acts on the throttle valve 17, whereby the throttle valve 1
7 moves to the low heat position slowly without descending at high speed. Note that a stopper may be provided on the lever 2 to stop the pin 17a short of contact with the vertical side e.

In the case shown in FIG. 6, the bush 4 as an intermediate member is mounted on the cylindrical projection 32 provided on the head of the throttle valve 17 with a sliding clearance 41 between the bush 4 and the cylindrical projection 32. The sliding clearance 41 was filled with adhesive grease and inserted into the escape hole 34 formed in the guide plate 18. The clearance hole 34 is formed to have a diameter larger than the outer diameter of the bush 4 by a predetermined dimension, and allows the bush 4 to move in the clearance hole 34 in the lateral direction. The bush 4 is provided with a flange 42 as a stopper, which prevents the upper surface of the flange 42 from coming into contact with the lower surface of the guide plate 18 and coming out of the escape hole 34. 17
Was contracted between. In this case, the shapes of the cam window 19 and the long groove 22 may be those shown in FIG. 5, but in the case of the present embodiment, the shapes are shown in FIG.

According to this configuration, when the lever 2 is slowly operated from the high-fire operation position to the low-fire operation position, the pin 17a moves from the position a corresponding to the high-fire position of the throttle valve 17 in FIG. The throttle valve 17 moves to the position c corresponding to the low heat position, and the throttle valve 17 changes from the state shown in FIG. 6 (i) to the state shown in FIG. 6 (iii). When the lever 2 is suddenly operated, the pin 17a leaves the hypotenuse b,
It is forcibly lowered at a high speed to a middle position h along a substantially parallel oblique side f at a predetermined interval with respect to the oblique side b until it comes into contact with the vertical side e. At this time, the relative speed between the throttle valve 17 and the bush 4 is regulated by the adhesive grease.
Is lowered together with the throttle valve 17, the lever 2 can be operated lightly, and the state shown in FIG. In this state, there is nothing to restrict the upward movement of the bush 4, so that the bush 4 is pushed up by the urging force of the spring 3, and the flange 42 abuts on the guide plate 18. Then, the further rise of the bush 4 is prohibited, so that the urging force of the spring 3 acts on the throttle valve 17, and the throttle valve 17 is moved halfway by the force obtained by subtracting the deceleration force by the adhesive grease from the urging force of the spring 3. Slowly descends to a position c corresponding to the low heat position. The cam window 1 having the shape shown in FIG.
With the use of 9, since it is possible to squeeze at a high speed to a position where misfire does not occur, usability at the time of squeezing operation is good.

In the structure shown in FIG. 6, when the throttle valve 17 is moved from the low-fire position to the high-fire position, the regulating force of the adhesive grease acts to make the operation of the lever 2 heavy, but in the case shown in FIG. Is a method in which a pipe 5, which is a differential member, is interposed between a bush 4 and a cylindrical projection 32 with sliding clearances 41 and 51 interposed between both the bush 4 and the cylindrical projection 32. Only 51 is filled with adhesive grease. The bush 4 is provided with a flange 42 in the same manner as in the case of FIG. 6, and the pipe 5 is provided with a spring receiving portion 52 at one end and an engaging means for engaging the bush 4 at the other end. Claws 53 are formed on the same circumference at intervals, for example, at four places in the case of the present embodiment, and when the pipe 5 is assembled to the bush 4, the claws 53 are temporarily bent inward and inserted. Further, the spring 31, which is the second urging means, is contracted between the flange 42 and the spring receiving portion 52. In this case, the cam groove 19 and the long groove 22 having the same shapes as those shown in FIG. 7 are used.

According to this configuration, when the lever 2 is slowly operated from the high heat operation position to the low heat operation position, the pin 17a in the cam window 19 moves from the position a corresponding to the high heat position of the throttle valve 17 to the hypotenuse b. Along the position, the throttle valve 17 moves to a position c corresponding to the low heat position of the throttle valve 17, and the throttle valve 17 changes from the state shown in (i) of FIG. 8 to the state shown in (iii).
When the lever 2 is suddenly operated, the bush 4 and the pipe 5 move integrally as the claw 53 is engaged with the bush 4, and the throttle valve 17 moves from the state shown in FIG. Move to the state shown. Then, the bush 4 and the pipe 5 are pushed up integrally by the urging force of the spring 3, and the flange 42 of the bush 4 contacts the guide plate 18, and
Thereafter, the throttle valve 17 is slowly lowered to the low heat position by a small force obtained by subtracting the deceleration force of the adhesive grease filled in the sliding clearance 51 from the urging force of the spring 3. Next, when the lever 2 is operated from the low heat operation position to the high heat operation position to raise the throttle valve 17 in the low heat position toward the high heat position, as shown in FIG. The pipe 5 rises together with the throttle valve 17 while compressing the spring 31 due to the regulating force of the adhesive grease. At this time, since the sliding clearance 41 is not filled with the adhesive grease, the restricting force by the adhesive grease does not act on the lever 2 but only the compressive force of the spring 31 acts. Therefore, the urging force of the spring 31 is extremely reduced. If it is set small, the lever 2 can be operated from the low-fire operation position to the high-fire operation position with a smaller force than in the configuration shown in FIG. After the lever 2 is operated to the high-fire operation position and the throttle valve 17 is raised to the high-fire position, the pipe 5 is brought into the original state (i) where the claw 53 is engaged with the upper end of the bush 4 by the restoring force of the spring 31. Is returned to.

[0031]

As is apparent from the above description, according to the present invention, even when the operation for reducing the thermal power is performed rapidly, the gas supply amount can be reduced without forcibly temporarily stopping the operation mechanism during the operation. It is possible to prevent a misfire in the burner by reducing the decreasing speed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 shows the shape of a cam window in the first embodiment II-
II cross section

FIG. 3 is a diagram showing another shape of the cam window in the first embodiment.

FIG. 4 is a diagram illustrating a configuration of a regulating unit according to a second embodiment.

FIG. 5 is a diagram showing a shape of a cam window in the second embodiment.

FIG. 6 is a diagram illustrating a configuration of a regulating unit according to a third embodiment.

FIG. 7 is a view showing the shape of a cam window in a third embodiment.

FIG. 8 is a diagram illustrating a configuration of a regulating unit according to a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermal power control device 2 Lever 3 Spring 4 Bush 5 Pipe 17 Throttle valve 18 Guide plate 19 Cam window

Claims (7)

(57) [Claims] 1. A heating apparatus for a gas appliance for adjusting a gas flow rate by reciprocating a throttle valve between a high heat position and a low heat position by an operation mechanism, wherein the operation mechanism moves the throttle valve to a low heat position side of the throttle valve. Is restricted at a predetermined position corresponding to the operation position of the operation mechanism, and the throttle valve is movable at least in a low heat operation position of the operation mechanism over a position where the heating power is stronger than the low heat position, and the throttle is A thermal power control device for a gas appliance, comprising: urging means for urging a valve toward a low heat position; and regulating means for restricting high-speed movement of a throttle valve to a low heat position. 2. The throttle valve has a projection formed at right angles to the reciprocating direction, inclined at a predetermined angle with respect to the reciprocating direction, and provided with an inclined portion that contacts the projection when the throttle valve moves to a low-fire position. 2. The apparatus for controlling heat of a gas appliance according to claim 1, wherein the control means is a regulating means. 3. The gas according to claim 1, wherein said regulating means comprises a fixed member opposed to the throttle valve with a sliding clearance, and a viscous material filling the sliding clearance. Apparatus heat control device. 4. The regulating means comprises an intermediate member facing the throttle valve with a sliding clearance, a viscous body filling the sliding clearance, and a fixing member holding the intermediate member. 2. The apparatus according to claim 1, wherein the urging means is provided on the intermediate member. 5. The apparatus according to claim 4, wherein the intermediate member is movable in a direction perpendicular to a sliding direction of the throttle valve. 6. The intermediate member is movable along the direction in which the throttle valve slides, and the intermediate member is stopped during movement against a reaction force acting on the intermediate member from the urging means. The thermal power control apparatus for gas appliances according to claim 4, further comprising a stopper. 7. A differential member having a sliding clearance with respect to both the intermediate member and the throttle valve,
Filling the sliding clearance between the throttle valve and the differential member with a viscous body, and providing an intermediate member with a second urging means for urging the throttle valve toward the low heat position via the differential member, 7. The apparatus according to claim 6, further comprising an engaging means for engaging the intermediate member and stopping the sliding of the differential member with respect to the intermediate member.