KR0181632B1 - Fire power regulating device for gas instrument - Google Patents

Abstract

[purpose]

Even if the fire control lever is operated rapidly from 'strong' fire to 'weak' fire, it provides a compact device that does not burn the burner.

[Configuration]

The cam surface freely rotates and moves forward and protrudes the pin to the throttle valve that controls the flow of gas by the move forward and backward, and regulates the movement of the throttle valve in the 'weak' thermal direction at a predetermined position corresponding to the rotational position of the throttle valve. And, the free end is characterized in that the spring is installed to hold the throttle valve in the 'weak' thermal direction in contact with the pin.

Description

Fire control device for gas appliances

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

2 is a perspective view showing the shape of the spring.

3 is a view showing the state of attachment of the spring.

4 is a view for explaining the movement of the pin.

5 shows a second embodiment of a spring shape;

6 shows a third embodiment of a spring shape;

7 is a perspective view of another type of thermal power control apparatus to which the present invention is applied.

* Explanation of symbols for main parts of the drawings

1-thermal control 2-lever

3-opening 4-spring

5-Link 17-Throttle Valve

[TECHNICAL FIELD OF THE INVENTION]

The present invention relates to a thermal control device for a gas appliance having a throttle valve for controlling the thermal power by increasing and decreasing the amount of gas supplied to the burner by reciprocating between the 'strong' thermal position and the 'weak' thermal position.

[Prior art]

In general, when gas is supplied to the burner, the gas is injected at a high speed from the nozzle into the mixing pipe located upstream of the flame hole of the burner, and the ambient air of the nozzle and the gas sucked into the mixing pipe by the ejector effect by the gas injection. Is mixed in a mixing tube to a mixer state and then supplied to the burner.

In the gas appliance of this type, the fire power is adjusted by increasing or decreasing the injection amount of the gas. When the injection amount of the gas decreases, the intake amount of the air also changes accordingly. In other words, if the injection amount of gas decreases, the intake amount of air decreases. On the contrary, if the injection amount of gas increases, the intake amount of air also increases. Therefore, the air-fuel ratio (ratio of air and fuel) of the mixer remains constant even if the injection amount of gas increases or decreases. do.

However, if the thermal power is sharply adjusted, the air-fuel ratio may drop from the normal value transiently. In particular, if the thermal power is sharply reduced from 'strong' thermal power to 'weak' thermal power, the rate of decrease of air due to inertia cannot follow the rate of decrease of gas, resulting in a large ratio of air to gas, that is, a thinner mixer. In addition, there is a fear that the mixing capacity itself will be reduced, thereby causing a loss.

Here, in order to solve the above problems, Japanese Patent Application No. Hei 6-88416 forms a cylindrical upper portion in the fixing member, forms a throttle valve to be inserted into the cylindrical upper portion, and fills the grease therebetween. In addition, a coil spring that surrounds the throttle valve is provided between the fixing member and the throttle valve.The coil spring holds the throttle valve in the 'weak' thermal direction and contacts the pin protruding from the throttle valve. It has already been proposed to have a cam surface that regulates the position of the throttle valve in the 'weak' thermal direction at a predetermined position.

[Problems that the invention tries to solve]

However, in the above proposal, since the throttle valve has to be inserted into the cylindrical upper part and the space for shaft mounting of the coil spring must be formed, that is, the throttle valve must be formed considerably longer, which causes a problem that the size of the thermal control device becomes large. .

In the present invention, in view of the above-described problems, even if the operation mechanism for adjusting the fire power is suddenly operated on the 'weak' power side, it is possible to prevent misfire of the burner without stopping the movement of the operation mechanism once in the middle. It is an object to provide a gas fire control device without increasing the size.

[Means for solving the problem]

In order to achieve the above object, the rotation of the throttle valve in the predetermined position corresponding to the rotational position of the throttle valve is projected to the throttle valve which is free to rotate and move forward and adjust the flow rate of the gas by the move forward and backward. And a spring for regulating the movement of the shaft and a spring at which the free end abuts against the pin and holds the throttle valve in the 'weak' thermal direction.

Therefore, it is not necessary to form the throttle valve long by engaging the spring with the pin.

Embodiment of the Invention

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, 1 is a thermal power control apparatus for adjusting the amount of gas supplied to the mixing pipe 10b located upstream of the flame hole of the burner, and the gas supplied from the gas supply port 11 is supplied from the supply path 12. FIG. It is comprised so that it may inject into the mixing pipe 10b through the nozzle 10a, and the mixer which mixed the surrounding air and gas sucked by the ejector effect to a burner. When the ignition / extinguishing button 13 for igniting / extinguishing the burner is pressed, the device opens the electronic safety valve 15 and keeps the main valve 16 open by the push-pushing mechanism 14. It is well known.

In more detail, when the ignition / extinguishing button 13 is pressed, the rod 15a of the electromagnetic safety valve 15 and the rod 15a are pushed by the front end surface of the slide bar 13b which is pressed against the spring 13a. The rod 16a of the main valve 16 is pressed to open both the solenoid safety valve 15 and the main valve 16. Here, when the pressing operation of the ignition / extinguishing button 13 is released, the slide bar 13b is pushed back by the holding force of the spring 13a, and the slide cam 13a of the heart cam groove 14a formed in the slide bar 13b is returned. Since the locking pin 14b is caught in the intermediate locking position, the slide bar 13b is once caught in the intermediate locking position on the way. At this time, the main valve 16 is in an open state because the rod 16a is in contact with the front end surface of the slide bar 13b. On the other hand, the rod 15a of the electronic safety valve 15 is in a state away from the front end surface, but is adsorbed by the thermoelectric power of a thermocouple (not shown) to maintain an open state.

In addition, since the operation of pushing the ignition / extinguishing button 13 again to extinguish the fire, the locking pin 14b is peeled off at the intermediate locking position of the heart cam groove 14a, so that the slide bar 13b is burnt in the spring 13a. It returns to its original position by intellect. Therefore, since the main valve 16 is blocked and not supplied to the gas or the burner, it is extinguished. In this case, the thermoelectric power in the thermocouple is lost and the electromagnetic safety valve 15 is also closed.

The increase / decrease control of the amount of gas supplied to the burner from the supply passage 12 is performed by the lifting and lowering of the throttle valve 17. The throttle valve 17 is equipped with an O-ring 17b. When the throttle valve 17 rises in response to the sliding frictional resistance of the O-ring 17b, the gas in the portion where the throttle valve 17 is installed is provided. The passage area of is widened and, on the contrary, the passage area is narrowed down.

A pin 17a protrudes from the throttle valve 17, and the pin 17a is fitted into an opening 3 formed in the guide plate 18, and the lower edge of the opening 3 has a cam surface to be described later. It consists. In addition, the thermal power control apparatus 1 is provided with a lever 2 supported by the support pin 21 so that the fire is free, and the pin 17a is formed in the longitudinal direction longitudinally in the lever 2. Also fitted to (22). In addition, a spring 4 is attached to the guide plate 18, which is a cam plate, and an elastic portion 41 of one side supporting shape of the spring 4 always keeps the pin 17a downward, that is, of the throttle valve 17. It is struggling in the 'weak' thermal direction.

The spring 4 is made of a wire rod of spring steel molded into the shape shown in FIG. 2, and the base end 43 connected to the elastic portion 41 in contact with the pin 17a through the curved portion 42 is elastic. An engaging portion 44 protruding in a direction perpendicular to the plane including the portion 41, the curved portion 42, and the base end 43 is formed. And as shown in FIG. 3, the slit formed in the upper part of the opening part 3 of the guide plate 18 while engaging the curved part 42 to the L-shaped latching protrusion 18b formed in the opening part 3 side of the guide plate 18. As shown in FIG. The spring 4 was held on the guide plate 18 by one touch by elastically deforming and engaging the engaging portion 44 in the engaging hole 18a of the upper image. In addition, since the spring 4 is held on the guide plate 18 by its own shape, it does not require a separate member for holding, and when the spring 4 is removed, the spring 43 is held by the proximal end 43. Simply pull it out and you can easily remove it without using tools.

As described above, in the state where the spring 4 is held on the guide plate 18, the elastic portion 41 is brought into contact with the upper surface of the pin 17a so that the pin 17a is supported by the lower side.

The opening part 3 has a cam surface which consists of the horizontal part 31, the 1st inclination part 32, and the 2nd inclination part 33 as shown in FIG. 4, The pin 17a is the spring 4 Is pressed against the cam surface. In the state where the slit 22 is located on the left side in FIG. 4 and the pin 17a is located on the horizontal portion 31, the throttle valve 17 is pulled up to the MAX position, which is the rising end, so that the burner is 'strong' 'The fire state. In this state, when the lever 2 is rocked and the slit 22 is moved to the right side in FIG. 4, the pin 17a moves from the horizontal portion 31 to the first inclined portion 32, and the slit ( If the 22) is moved to the right side, the burner is in a 'weak' thermal state by descending along the second inclined portion 33 to the MIN position which is the lower end.

When the slit 22 is moved at a normal speed, the pin 17a does not fall off the cam surface due to the holding force of the spring 4, but the lever 2 is rapidly operated to move the slit 22 to the fourth position. When moving to the right side in the figure at a high speed, the cam force of the spring 4 which moves the throttle valve 17 in the 'weak' thermal direction in response to the slide frictional resistance of the O-ring 17b is a pin ( Since 17a) cannot be kept in contact with each other at all times, when the slit 22 moves to the right end in FIG. 4, the state where the pin 17a falls only to the a position above the MIN position do.

In this state, since the pin 17a is not supported from the lower side, the pin 17a is lowered to the MIN position at a constant speed by the holding force of the spring 4. Accordingly, the pin 17a is lowered at a speed such that it does not follow the rapid operation of the lever 2 in the 'weak' thermal direction. Further, the upper edge 34 of the opening 3 is formed so as to be open toward the upper side and the right side with respect to the cam surface so as not to restrain such movement of the pin 17a in the opening 3. In addition, when the lever 2 is operated from the 'weak' thermal state to the 'strong' thermal state, the pin 17a moves along the cam surface.

Although the spring 4 was formed in one side support shape in the said embodiment, you may form in both sides support shape as shown in FIG. In this embodiment, the spring 4a was hold | maintained by inserting the both ends of the spring 4a in the engagement hole 18c formed in the guide plate 18, respectively. Both ends of the spring 4a are freely rotated with respect to this engagement hole 18c, and thus the deformation value (bending degree) of the spring 4a can be largely taken.

In addition, as shown in FIG. 6, one end of the torsion spring 4b is inserted and held in the engagement hole 18c so as to be freely rotated, and the other end is wound around the pin 17a so as to freely rotate and the torsion spring 4b. ), The pin 17a may always be pulled downward. In addition, it is preferable to form a recessed groove in the pin 17a over the entire circumference so that the other end wound on the pin 17a is not peeled off.

In addition, this invention shown in each said embodiment is applicable also to the thing of the form shown in FIG. In FIG. 7, when the ignition / extinguishing button 13 is pressed, the protruding piece 13c formed on the slide bar 13b presses the inverted portion 51 formed at the lower end of the link 5 to rotate the link 5. Let's do it. In this manner, the slit 52 formed near the upper end of the link 5 moves the pin 17a to force the throttle valve into a 'strong' fire state. In addition, in this embodiment, the lever 2 is attached to the upper surface of the guide plate 18 so that swinging around the caulking pin 19 can be carried out freely, and the upper part of the groove part 23 and the link 5 of this lever 2 are upper end. By cooperation of the supporting point portion 53 of the lever 2 is forcibly moved to the 'strong' thermal position. In this type, even if the lever 2 is set to the 'weak' fire position before ignition, if the ignition / fire extinguishing button 13 is pressed to ignite, the lever 2 is forcibly moved to the 'strong' fire position. Therefore, there is a case in which the lever 2 is urgently returned to the 'weak' fire position after ignition, and in such a case, it is possible to prevent misfire of the burner by applying the present invention in particular.

[Effects of the Invention]

As can be seen from the above description, according to the present invention, even if the operation to reduce the thermal power is abruptly, the burner can be misfired by slowing down the rate of gas supply without forcibly stopping the operation mechanism during operation. In addition, the size of the fire control device does not increase because the length of the throttle valve is minimized.

Claims (2)

The cam surface freely rotates and moves forward and protrudes the pin to the throttle valve that controls the flow of gas by the move forward and backward, and regulates the movement of the throttle valve in the 'weak' thermal direction at a predetermined position corresponding to the rotational position of the throttle valve. And a spring for free end contacting the pin to support the throttle valve in the 'weak' thermal direction. The gas-powered fire control apparatus according to claim 1, wherein the spring is held on a cam plate on which the cam surface is formed.