JP3607095B2 - Gas power burner control mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thermal power adjustment mechanism that adjusts the thermal power of a burner of a gas appliance, and the thermal power is adjusted by rotating an operation lever pivotally supported on a base portion of the thermal power adjustment mechanism between a high fire position and a low fire position. About things.
[0002]
[Prior art]
As this type of thermal power adjustment mechanism, there is a mechanism in which the operation lever is assembled to the base portion by caulking using a shaft pin inserted into the shaft hole of the base portion of the thermal power adjustment mechanism.
[0003]
Further, as disclosed in Japanese Patent Laid-Open No. 8-178282, the guide lever of the control lever is brought into contact with the stepped portion of the stepped guide of the base portion while the control lever is rotated from the high fire position to the low fire position. In some cases, the operation lever is prevented from rotating all the way to a low fire position to prevent misfire. In this device, the operating lever is composed of a lever base that is pivotally supported and a lever body that is pivotably connected to the lever base plate via a spring joint. The lever body is attached to the spring joint. When the contact state between the stepped portion of the stepped guide and the guide element is released by swinging against the force, the operation lever can be further rotated to the low heat position.
[0004]
[Problems to be solved by the invention]
By the way, when the operation lever is assembled by caulking, the stepped shaft pin must be accurately caulked with appropriate strength, which requires a large number of assembling steps. If the operation lever is composed of two members, a lever substrate and a lever main body, to prevent misfire, the number of parts increases and the assembly of the operation lever is complicated when assembling the thermal power adjustment mechanism.
[0005]
In view of the above, the present invention provides a burner thermal power adjustment mechanism for a gas appliance that can be easily and quickly assembled by using an operation lever that is easy to assemble to a base portion and that is composed of one member. The task is to do.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention is a thermal power adjustment mechanism that adjusts the thermal power of a burner of a gas appliance, and an operation lever that is pivotally supported by a base portion of the thermal power adjustment mechanism is placed between a high fire position and a low fire position. For adjusting the thermal power by rotating, a shaft is provided in the base part of the thermal power adjusting mechanism and a shaft hole is formed in the operation lever. A spring member for urging the lever toward the base portion is attached to the base portion, and the operation lever is held by the base portion.
[0007]
In this way, when the spring member is attached with the shaft hole fitted to the shaft, the operation lever is rotatably held by the base portion. Accordingly, the caulking work that has been necessary when assembling the operation lever in the related art becomes unnecessary, and the operation lever can be assembled quickly and easily.
[0008]
By the way, with such a configuration, the operation lever can be tilted by lifting the operation lever against the urging force of the spring member in a direction orthogonal to the rotation direction. However, when the operating lever is tilted, the shaft support state with respect to the shaft of the shaft hole becomes unstable, and the operating lever may be detached from the shaft when the operating lever is rotated while being tilted.
[0009]
Here, if the spring member has a convex portion that is rotatably fitted in the shaft hole of the operation lever, the shaft hole and the convex portion are maintained in the fitted state even when the operation lever is tilted. It can be rotated in the tilted state. If it does in this way, the operation lever comprised by 1 member can be tilted and can be supported so that it can rotate in the tilted state, and the number of parts can be reduced. Therefore, unlike the prior art, it is not necessary to configure the operation lever with two members, that is, a portion that is pivotally supported and a portion that can tilt with respect to this portion. If the operation lever can be constituted by one member, it is not necessary to assemble the operation lever when assembling the thermal power adjustment mechanism, and the assembly work of the thermal power adjustment mechanism becomes easy.
[0010]
Further, an elongated hole that intersects the radial direction of the axial hole at a predetermined inclination angle is formed in the vicinity of the axial hole of the operating lever, and the operating hole is turned in the longitudinal direction by rotating the operating lever. A moving sphere is inserted, and the sphere is urged toward the base by the spring member, and the operation lever is at a predetermined position between the high fire position and the low fire position and is located at the outer peripheral end of the elongated hole. An engagement hole that engages with the sphere may be formed in the spring member.
[0011]
If it does in this way, when an operation lever is rotated, it will move to the different edge part in a long hole by the direction which the spherical body in a long hole rotates. Since the elongated hole is inclined with respect to the radial direction of the shaft hole, the moving path of the sphere varies depending on the direction in which the operation lever is rotated. Therefore, the sphere engages with the engagement hole only when the operation lever reaches the predetermined position by the throttle operation in which the operation lever is rotated from the high fire position to the low fire position. In order to further rotate the operation lever to the low heat position side from the state where the sphere is engaged with the engagement hole, a force is required to cause the sphere to escape from the engagement hole against the bias of the spring member. This escape force is applied to the person who performs the operation as a click feeling, and the operation lever is prevented from being rotated to the low fire position all at once.
[0012]
Conventionally, the protrusion provided on the operation lever is brought into contact with the stopper to prevent the operation lever from rotating all at once. To rotate the operation lever to the low heat position, the operation is performed to release the restriction. Although it is necessary to tilt the lever in a direction perpendicular to the rotation direction, if the operation lever is prevented from rotating all at once to a low heat position by giving a click feeling in this way, the diaphragm operation can be performed. Sometimes it is not necessary to tilt the operating lever, improving the operability of the aperture operation.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
With reference to FIG. 1, reference numeral 1 denotes a combustion control unit of a burner (not shown) used in a gas appliance such as a stove, and a fire extinguishing control mechanism 1 </ b> A for controlling supply and stop of fuel gas to the burner; It is comprised from the thermal power adjustment mechanism 1B which adjusts the supply amount of fuel gas, and adjusts a thermal power. The point fire extinguishing control mechanism 1A is a conventional product and will not be described.
[0014]
The thermal power adjustment mechanism 1B includes a main body 2 attached to the point fire extinguishing control mechanism 1A and an adjustment mechanism 3 that adjusts the flow rate of the fuel gas. A gas passage 21 is formed in the main body 2 as shown in FIG. The gas passage 21 includes a main passage 21a that communicates with the fuel gas outlet H of the fire extinguishing control mechanism 1A at the lower end and opens at the upper end, and a branch passage 21b that communicates with the upper portion of the main passage 21a. The fuel gas supplied from the mechanism 1A to the main passage 21a is supplied from the branch passage 21b to the burner side. Further, the valve body 4 is inserted into the main passage 21a from above, and the valve seat 22 is in contact with the inner peripheral wall of the main passage 21a at a position below the connecting portion with the branch passage 21b. Is formed.
[0015]
A bracket 23 is attached on the main body 2, and the main body 2 and the bracket 23 constitute a base portion that pivotally supports a return lever 31 described later. As shown in FIG. 3, the bracket 23 includes an upper plate 23 a, a side plate 23 c in which the groove cam 23 b is formed, and a front plate 23 d that is connected to the front portion of the upper plate 23 a via a bent portion. A shaft 23e, which is a disc-shaped protrusion, is formed on the upper surface of the upper plate 23a by half punching, and engaging claws 23f and 23f are formed on the front and rear ends of the upper plate 23a. In addition, a slit 23g is formed in a bent portion between the upper plate 23a and the front plate 23d, and a stopper 23h for stopping the rotation of the operation lever 32 described later is formed on the front plate 23d.
[0016]
As shown in FIG. 2, the valve body 4 includes a base portion 41 that is in sliding contact with the inner peripheral surface of the main passage 21 a, a relay portion 42 that extends downward from the base portion 41, and a lower end that is formed below the relay portion 42. And a throttle portion 43 that is in contact with the seat 22. The valve body 4 can move forward and backward along the main passage 21 a, and the gas flow rate is adjusted by the distance between the throttle portion 43 and the valve seat 22. A laterally extending pin 44 is attached to the upper portion of the base portion 41. The pin 44 is engaged with a groove cam 23b formed in the bracket 23 and extending in a direction inclined with respect to the main passage 21a. Since the valve body 4 can rotate about the axis, when a force in the rotational direction is applied to the pin 44, the valve body 4 is guided by the groove cam 23b and moves forward and backward along the main passage 21a while rotating. . An O-ring 45 for hermetic sealing is attached to the outer periphery of the base 41.
[0017]
As shown in FIG. 1, the adjustment mechanism 3 includes a return lever 31 that is pivotally supported on the side surface of the main body 2 and an operation lever 32 that rotates the return lever 31. The return lever 31 is pivotally supported on the main body 2 of the thermal power adjusting mechanism 1B by a shaft pin 31b so as to be able to rotate in a plane parallel to the longitudinal direction of the main passage 21a, and the upper portion thereof is supported on the side plate 23c of the bracket 23. It is arranged adjacent to each other in parallel. In addition, a slit 31 a extending in the longitudinal direction of the return lever 31 is formed in the upper portion of the return lever 31. A pin 44 of the valve body 4 inserted through the groove cam 23b is inserted through the slit 31a.
[0018]
The operation lever 32 includes a wide lever base portion 32a that is pivotally supported by the shaft 23e of the upper plate 23a of the bracket 23, a step portion 32b formed substantially at the center of the operation lever 32, and a lever base portion 32a via the step portion 32b. And a thin plate-like lever tip 32c. As shown in FIG. 3, the lever base 32a is formed with a shaft hole 32d, a protrusion 32e extending downward, a tongue piece 32f extending toward the lever tip 32c, and a rectangular engagement hole 32g.
[0019]
An engagement piece 31c at the upper end of the return lever 31 is engaged with the engagement hole 32g. When the operation lever 32 is rotated, the return lever 31 is rotated and inserted into the slit 31a of the return lever 31. The pin 44 is rotated and the valve body 4 is rotated. The pin 44 is also inserted into the cam groove 23b of the bracket 23, and the valve body 4 moves forward and backward in the passage 21a simultaneously with the rotation to adjust the gas flow rate.
[0020]
The shaft hole 32d is rotatably fitted to the shaft 23e of the bracket 23. Further, the projection 32e faces the slit 23g of the bracket 23, and the range in which the operation lever 32 can be rotated is limited to the range in which the projection 32e contacts the peripheral edge of the slit 23g. Specifically, the operation lever 32 can rotate between a high fire position and a low fire position indicated by a two-dot chain line in FIG. Further, the tongue piece 32f is bent and positioned below the lever base portion 32a. Accordingly, the operation lever 32 is rotated in the direction of the throttle operation from the high fire position to the low fire position side (the direction of the arrow Y in FIG. 1B) with the lever base portion 32a in contact with the upper plate 23a of the bracket 23. Then, the tongue piece 32f comes into contact with the stopper 23h and reaches the position where the rotation of the operation lever 32 is stopped. As a result, the operation lever 32 is suddenly turned from the high fire position to the low fire position to prevent the burner flame from misfiring.
[0021]
The operation lever 32 is held by a spring member 24 attached to the bracket 23 from above. The spring member 24 is made of spring steel, and as shown in FIG. 3, a cover portion 24a covering the periphery of the shaft hole 32d of the lever base portion 32a, and bent portions 24b and 24b formed on both sides of the cover portion 24a, Is provided. The cover 24a has a central portion that bulges downward and has a cross-sectional shape in the front-rear direction that is substantially M-shaped. As shown in FIG. 4, a convex part 24 c that protrudes downward is formed at the center of the cover part 24 a, and is fitted to the shaft hole 32 d of the operation lever 32 so as to be rotatable. Engagement slits 24d are respectively formed in the bent portions 24b and 24b, and the engagement slits 24d are engaged with engagement claws 23f formed at the front and rear ends of the upper plate 23a of the bracket 23, so that the spring member 24 is engaged. Is attached to the bracket 23. Both the engagement slits 24d are engaged with the engagement claws 23f by pressing the cover portion 24a toward the bracket 23, and the periphery of the shaft hole 32d of the lever base portion 32a is pressed against the bracket 23 by the spring member 24.
[0022]
By the way, the spring member 24 has a substantially M-shaped cross section and can be elastically deformed. Accordingly, the lever tip 32c of the operation lever 32 pivotally supported by the bracket 23 and the spring member 24 is pushed upward (see the arrow U in FIG. 1A) against the bias of the spring member 24 and tilted. It is possible to make it.
[0023]
Therefore, when the operation lever 32 is tilted when the tongue piece 32f comes into contact with the stopper 23h and reaches the position where the rotation to the low heat position side is stopped (see FIG. 1A), the tongue piece 32f and the stopper 23h. As shown in FIG. 1A, the lower surface of the tongue piece 32f rides on the stopper 23h, and the operation lever 32 can be further rotated to the low heat position side. Further, even when the operation lever 32 is tilted, the state in which the convex portion 24c of the spring member 24 is fitted in the shaft hole 32d of the operation lever 32 is maintained, so that the shaft 23e of the bracket 23 is tilted with the operation lever 32 tilted. It is possible to turn without disengaging.
[0024]
Therefore, when the operation lever 32 is rotated to the low heat position side, when the tongue piece 32f contacts the stopper 23h and the rotation is stopped, the lever tip 32c is pushed up to tilt the operation lever 32, After releasing the contact between the tongue piece 32f and the stopper 23h, the operation lever 32 is rotated to the low heat position side.
[0025]
With this configuration, the operation lever 32 can be quickly and easily attached to the bracket 23 simply by attaching the spring member 24. Moreover, since the operation lever 32 can be comprised by one member, it is not necessary to assemble the operation lever 32 and the assembly of the thermal power adjustment mechanism 1B is easy.
[0026]
Next, another embodiment of the operation lever 32 and a structure for supporting the operation lever 32 will be described. In addition, the same code | symbol is attached | subjected about the thing similar to the thing of the said embodiment, and description is abbreviate | omitted.
[0027]
As shown in FIG. 5, the heating power adjustment mechanism 1 </ b> B of the embodiment described here does not have a configuration corresponding to the stopper 23 h of the main body 2 and the tongue piece 32 f of the operation lever 32 of the embodiment described above. Therefore, the operation lever 32 can be rotated between the high fire position and the low fire position without tilting. On the other hand, in this embodiment, a long hole 32k is formed in the vicinity of the shaft hole 32d of the operating lever 32, and a steel ball 5 is inserted into the long hole 32k. A steel ball is provided in the cover portion 24a of the spring member 24. An engagement hole 24k for engaging 5 is formed.
[0028]
The long hole 32k of the operation lever 32 is formed at a position sandwiched between the upper plate 23a of the bracket 23 and the cover 24a of the spring member 24. Accordingly, the steel ball 5 in the long hole 32k is urged toward the bracket 23 by the spring member 24.
[0029]
The long hole 32k is formed such that its longitudinal direction intersects with the radial direction of the shaft hole 32d at a predetermined inclination angle. Therefore, when the operation lever 32 is rotated in the direction Y of the throttle operation from the high fire position to the low fire position (see FIG. 1B), as shown in FIG. 6, the end of the long hole 32k is at the high fire position. The steel ball 5 located at the inner peripheral side position P1 moves to the outer peripheral side away from the shaft hole 32d of the operation lever 32 (along the path a) and reaches the outer peripheral side position P2 which is the other end in the long hole 32k. . When the operation lever 32 is further rotated in the direction Y of the diaphragm operation, the steel ball 5 moves in the rotation direction (along the path b) while maintaining the outer peripheral side position P2 in the elongated hole 32k, and the operation lever 32 is moved. Becomes a low heat position. Thereafter, in order to increase the heating power, when the operation lever 32 is rotated in the direction of the opening operation from the low heat position to the high heat position (the direction opposite to the direction of the arrow Y), the outer lever side position P2 was reached in the low heat position. The steel ball 5 moves inward (along the path c) approaching the shaft hole 32d and reaches the inner peripheral side position P1 in the elongated hole 32k. When the operation lever 32 is further rotated in the direction of the opening operation, the steel ball 5 moves in the rotation direction (along the path d) while maintaining the inner peripheral side position P1 in the elongated hole 32k.
[0030]
Thus, the moving path of the steel ball 5 with respect to the bracket 23 and the spring member 24 differs depending on the direction in which the operation lever 32 is rotated.
[0031]
The engagement hole 24k of the spring member 24 is formed at a position where it can engage with the steel ball 5 on the movement path b. More specifically, as shown in FIGS. 5 and 6, the operation lever 32 is engaged with the steel ball 5 at the outer peripheral side position P2 in the long hole 32k in a state where the operation lever 32 is at a predetermined position between the high fire position and the low fire position. An engagement hole 24k is formed at a position to be engaged. Accordingly, the steel ball 5 engages with the engagement hole 24k only when the operation lever 32 is rotated in the direction of the throttle operation from the high fire position to the low fire position.
[0032]
When the steel ball 5 is engaged with the engagement hole 24k, a force for allowing the steel ball 5 to escape from the engagement hole 24k is required to further rotate the operation lever 32 in the direction of the drawing operation. This escape force is given to the person who operates as a click feeling. Thereby, it is prevented that the operation lever 32 is rotated to the low fire position at a stretch, and it is possible to prevent the occurrence of misfire or the like due to the operation. Further, when the steel ball 5 is engaged with the engagement hole 24k, an engagement sound such as “clicking” is generated between the steel ball 5 and the spring member 24, so that the operation lever 32 is rotated by the engagement sound. The position can be recognized. In this embodiment, the center of the spring member 24 is bent and adjusted so that the urging force of the spring member 24 mainly on the steel ball 5 is strengthened to increase the click feeling.
[0033]
With such a configuration, the operation lever 32 can be configured with one member, so that it is not necessary to assemble the operation lever 32, and the operation lever 32 can be quickly and easily attached to the bracket 23 simply by attaching the spring member 24. This makes it easier to assemble the thermal power adjustment mechanism 1B. In addition, since a misfire is prevented by providing a click feeling, it is not necessary to tilt the operation lever 32 during the diaphragm operation, and the operability is excellent.
[0034]
【The invention's effect】
As described above, according to the present invention, the operation lever can be constituted by one member, there is no need to assemble the operation lever, the operation lever can be quickly and easily attached, and the heating power adjusting mechanism can be easily assembled.
[Brief description of the drawings]
1A is a side view showing a thermal power adjusting mechanism, FIG. 1B is a plan view showing the thermal power adjusting mechanism, and FIG. 2 is a partial cross-sectional view showing the internal structure of the thermal power adjusting mechanism. FIG. 4 is a cross-sectional view showing a shaft support structure of an operating lever. FIG. 5 is an exploded perspective view showing a main part of another embodiment. FIG. 6 is an explanatory view showing the movement of a steel ball. Explanation of]
1B Thermal power control mechanism 2 Body (part of base)
4 Valve body 5 Steel ball (sphere)
23 Bracket (part of base)
23e Shaft 24 Spring member 24c Convex part 24k Engagement hole 32 Operation lever 32d Shaft hole 32k Elongated hole

Claims (3)

A thermal power adjustment mechanism for adjusting the thermal power of a burner of a gas appliance, wherein the thermal power is adjusted by rotating an operation lever pivotally supported on a base portion of the thermal power adjustment mechanism between a high fire position and a low fire position. ,
A shaft is provided in the base part of the thermal power adjustment mechanism and a shaft hole is formed in the operation lever, and the shaft hole is rotatably fitted around the shaft.
A heating power adjustment mechanism for a burner of a gas appliance, wherein a spring member that biases the periphery of a shaft hole toward the base portion is attached to the base portion, and an operation lever is held on the base portion. The said spring member is provided with the convex part rotatably fitted in the shaft hole of an operation lever, The thermal-power adjustment mechanism of the burner of the gas equipment of Claim 1 characterized by the above-mentioned. In the vicinity of the shaft hole of the operating lever, a long hole that intersects with a predetermined inclination angle with respect to the radial direction of the shaft hole is formed,
In the elongated hole, a sphere that moves in the longitudinal direction of the elongated hole is inserted by turning the operation lever, and the sphere is biased toward the base portion by the spring member.
2. An engagement hole that engages with a sphere at an outer peripheral side end of the elongated hole in a state where the operation lever is at a predetermined position between a high fire position and a low fire position, wherein the spring member is formed. Or the thermal-power adjustment mechanism of the burner of the gas equipment of Claim 2.

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