JP2013044502A - Heating power regulating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating power regulating device that increases or decreases a gas flow rate by advancing or retracting a needle valve linked with the swing operation of a heating power regulation lever 6 that is pivotally supported by a support shaft 41 fixed to the outer surface of a valve casing 4 incorporating the needle valve, the heating power regulating device including a leaf spring 8 interposed between a washer 7 fixed to the outer end of the support shaft and the heating power regulation lever, wherein the leaf spring can be prevented from settling due to the tilting of the heating power regulation lever.SOLUTION: The heating power regulating device includes a stopper means that restricts the tilting angle of the heating power regulation lever 6 to a predetermined angle or smaller, which is smaller than a maximum tilting angle defined by a clearance between the washer 7 and the heating power regulation lever 6. For example, a projection 83 is formed on the leaf spring 8, the projection to be held between the heating power regulation lever 6 and the washer 7 while the tilting angle of the heating power regulation lever 6 reaches a predetermined angle, and the projection constitutes the stopper means.

Description

  The present invention includes a needle valve provided in a valve casing so as to be movable back and forth, and a thermal power adjustment lever pivotally supported on a support shaft fixed to the outer surface of the valve casing. The present invention relates to a thermal power control device that advances and retracts a needle valve in conjunction with each other to increase or decrease the flow rate of gas passing through the needle valve.

  In this type of thermal power control device, when the thermal power control lever is swung to the minimum thermal power position and the needle valve is moved back to the minimum throttle position where the gas flow rate is minimum, the needle valve is advanced by the gas pressure on the upstream side. Pressed in the direction. The needle valve may be pushed and displaced in the forward direction while moving the heating power adjusting lever, and the gas flow rate at the minimum heating power may become unstable.

  Therefore, conventionally, according to Patent Document 1, a washer having a diameter larger than that of the shaft support hole at the base end portion of the thermal power adjusting lever in which the support shaft is fitted, and a clearance in the axial direction of the support shaft is generated between the washer and the thermal power adjustment lever. There is known a thermal power adjusting device which is fixed to the outer end portion of the support shaft and a leaf spring is interposed between the washer and the thermal power adjusting lever to press the thermal power adjusting lever toward the valve casing. In this case, when the thermal power adjustment lever is swung to the minimum thermal power position and the needle valve is retracted to the minimum throttle position, even if the needle valve is pushed in the forward direction by the upstream gas pressure, the leaf spring is pushed. The thermal power adjustment lever does not move from the minimum thermal power position by the frictional force generated by the pressure, the needle valve is held at the minimum throttle position, and the gas flow rate at the minimum thermal power is stabilized.

  Patent Document 1 exemplifies a leaf spring having a ring portion that abuts against a washer, and a plurality of spring piece portions that project radially from a plurality of locations on the outer periphery of the ring portion and abut against a heating power adjustment lever. ing.

  By the way, when operating the thermal power control lever, a force in a direction other than the swinging direction is also applied to the thermal power control lever, and the thermal power control lever corresponds to the gap amount between the washer and the thermal power control lever with respect to the plane orthogonal to the support shaft. May tilt only. In this case, the leaf spring partially bends to the limit, and when such a bend is repeated, the leaf spring is caused to be worn by fatigue. Then, when the leaf spring is set, the pressing force of the leaf spring is reduced, the needle valve cannot be held at the minimum throttle position, and the gas flow rate at the minimum heating power becomes unstable.

JP 2011-122734 A

  In view of the above points, an object of the present invention is to provide a thermal power adjusting device that can prevent the spring of the leaf spring from being loosened due to the tilting of the thermal power adjusting lever.

  In order to solve the above-mentioned problems, the present invention comprises a needle valve provided in a valve casing so as to be able to advance and retreat, and a thermal power adjustment lever pivotally supported on a support shaft fixed to the outer surface of the valve casing, A thermal power control device that increases or decreases the flow rate of gas passing through the needle valve by advancing and retracting the needle valve in conjunction with the swinging operation of the thermal power control lever, and the shaft of the base end portion of the thermal power control lever in which the support shaft is fitted A washer with a diameter larger than that of the support hole is fixed to the outer end of the support shaft so as to create a clearance in the axial direction of the support shaft between the washer and the heat control lever. In the case where a leaf spring that presses the lever toward the valve casing is installed, the maximum tilting angle defined by the amount of clearance between the washer and the heating power adjustment lever is the tilting angle of the heating power adjustment lever relative to the plane perpendicular to the support shaft. Smaller than the angle Characterized in that it comprises a stopper means for limiting the angle below.

  According to the present invention, since the tilting angle of the thermal power adjusting lever is limited to a predetermined angle or less by the stopper means, the leaf spring does not bend to the limit even when the thermal power adjusting lever is tilted, and the leaf spring is damaged due to fatigue. Can be prevented as much as possible. Therefore, the leaf spring can keep the pressing force necessary to hold the needle valve at the minimum throttle position for a long period of time, and can stabilize the gas flow rate at the minimum heating power.

  Here, in the present invention, the leaf spring is formed with a protrusion sandwiched between the heat adjustment lever and the washer in a state where the tilt angle of the heat adjustment lever reaches a predetermined angle, and the protrusion means is a stopper means. However, the present invention is not limited to this. For example, the washer may be formed with a protrusion that abuts on the thermal power adjustment lever in a state where the tilt angle of the thermal power adjustment lever reaches a predetermined angle, and the protrusion may constitute a stopper means. Alternatively, a protrusion that contacts the washer may be formed in a state where the tilt angle of the heating power adjustment lever reaches a predetermined angle, and the stopper means may be configured by this protrusion.

  Further, as exemplified in Patent Document 1, the leaf spring includes a ring portion that abuts against the washer, and a plurality of spring piece portions that project radially from a plurality of locations on the outer periphery of the ring portion and abut against the heating power adjustment lever. When it has, it is desirable to form the projection part which comprises a stopper means in each spring piece part. According to this, no matter which direction the heating power adjustment lever is tilted, the spring piece portion located on the side compressed by this tilting is prevented from being bent to the limit by the projection portion, and all the spring piece portions are Can prevent settling.

  Also, the leaf spring is provided with a plurality of tongue pieces that project radially from the portions located between the spring pieces on the outer periphery of the ring portion, and are not normally in contact with the heating power adjustment lever, and each tongue piece is provided with a stopper. Protrusions constituting the means may be formed. According to this, it can prevent that each spring piece part bends to the limit by the projection part of the tongue piece part located in the circumferential direction both sides of each spring piece part. Therefore, even with this, it is possible to prevent settling of all the spring pieces. Further, unlike the case where the protrusion is formed on the spring piece, the spring characteristic of the spring piece is not changed by the protrusion, and there is an advantage that the leaf spring can be easily designed.

The partial cutaway side view of the valve unit for stove which comprises the thermal-power adjustment apparatus of embodiment of this invention. (A) The perspective view of the decomposition | disassembly state of the principal part of 1st Embodiment, (b) The cutting | disconnection side view of the principal part of 1st Embodiment. (A) The perspective view of the decomposition | disassembly state of the principal part of 2nd Embodiment, (b) The cutting | disconnection side view of the principal part of 2nd Embodiment. (A) The perspective view of the decomposition | disassembly state of the principal part of 3rd Embodiment, (b) The cutting | disconnection side view of the principal part of 3rd Embodiment. (A) The perspective view of the decomposition | disassembly state of the principal part of 4th Embodiment, (b) The cutting | disconnection side view of the principal part of 4th Embodiment. (A) The perspective view of the decomposition | disassembly state of the principal part of 5th Embodiment, (b) The cutting | disconnection side view of the principal part of 5th Embodiment. (A) The perspective view of the decomposition | disassembly state of the principal part of 6th Embodiment, (b) The cutting | disconnection side view of the principal part of 6th Embodiment.

  Referring to FIG. 1, reference numeral 1 denotes a gas stove. A valve unit 2 that controls the gas supply to a stove burner (not shown) is disposed at the front of the gas stove 1. The valve unit 2 includes a lower first valve casing 3 and an upper second valve casing 4 which is a component of the thermal power control device.

  In the first valve casing 3, there are provided a rear electromagnetic safety valve 31, an opening / closing valve 32 positioned in front thereof, and an operation rod 33 elongated in the front-rear direction to which the opening / closing valve 32 is fixed. On the front surface of the gas stove 1, a fire extinguishing button 11 for operating the operation rod 33 is provided. Further, the first valve casing 3 is provided with a gas inlet port 3 a on the rear side of the lower surface located on the upstream side of the electromagnetic safety valve 31 and a gas relay port 3 b on the upper surface located on the downstream side of the on-off valve 32. When the point-extinguishing button 11 is pushed backward, the operating rod 33 moves backward, the electromagnetic safety valve 31 is pressed and opened, and the on-off valve 32 is opened, and the gas relay port is opened from the gas inlet 3a. Gas is allowed to flow in 3b.

  The second valve casing 4 has a gas passage 4a communicating with the gas relay port 3b of the first valve casing 3, and an upper elbow 4b connected to the downstream end of the gas passage 4a. Gas is supplied to the burner via a connected nozzle pipe (not shown). A valve hole 4c having a hole axis in the front-rear direction is provided in the middle of the gas passage 4a, and a needle that can move forward and backward in the second valve casing 4 along the hole axis of the valve hole 4c. A valve 5 is provided. At the rear part of the needle valve 5, an orifice hole 51 is formed to communicate the upstream gas passage portion and the downstream gas passage portion of the needle valve 5. Then, when the needle valve 5 is retracted to the minimum throttle position where the rear end portion of the needle valve 5 is fitted in the valve hole 4c, the gas flow rate that passes through the needle valve 5 and is supplied to the combustor is defined by the orifice hole 51. As the needle valve 5 moves forward from the minimum throttle position, the flow rate of gas supplied to the burner gradually increases.

  An operation pin 52 that is long in the vertical direction is fixed to the front end portion of the needle valve 5 in a penetrating manner. The operation pin 52 is inserted through a slit 42 extending in the front-rear direction formed at the front end of the second valve casing 4 and can move only in the front-rear direction. Further, a support shaft 41 is fixed to the outer surface (upper surface) of the second valve casing 4, and a thermal power adjusting lever 6 that is long in the front-rear direction is supported on the support shaft 41 in the lateral direction at the base end portion (rear end portion). Is pivotally supported by the shaft. The thermal power adjustment lever 6 is formed with a cam hole 62 with which the upper end portion of the operation pin 52 is engaged. As shown in FIG. 2A, the cam hole 62 is formed so that the distance from the support shaft 41 gradually decreases from one end portion in the lateral direction to the other end portion. Therefore, the needle valve 5 moves forward and backward in conjunction with the swinging operation of the heating power adjustment lever 6. Then, when the thermal power adjustment lever 6 is swung to one minimum thermal power position in the lateral direction and the operation pin 52 is engaged with the other lateral end of the cam hole 62, the needle valve 5 is Retract to the aperture position.

  An intermediate step portion 63 is formed in the middle portion of the thermal power adjustment lever 6, and the front half portion is offset upward with respect to the rear half portion of the thermal power adjustment lever 6 in which the shaft support hole 61 and the cam hole 62 are formed. ing. A knob 64 for operating the heating power adjustment lever 6 is attached to the front end portion of the heating power adjustment lever 6 protruding forward of the gas stove.

  With reference to FIG. 2, the support shaft 41 protrudes integrally with the upper surface of the second valve casing 4. A shaft support hole 61 into which the support shaft 41 is fitted is formed at the rear end portion of the heating power adjusting lever 6. Then, the outer end portion (upper end portion) of the support shaft 41 is formed so that a gap in the axial direction (vertical direction) of the support shaft 41 is formed between the washer 7 having a diameter larger than that of the shaft support hole 61 and the heating power adjusting lever 6. ) And a leaf spring 8 for pressing the heating power adjustment lever 6 against the second valve casing 4 is interposed between the washer 7 and the heating power adjustment lever 6.

  The leaf spring 8 protrudes radially from a plurality of locations on the outer periphery of the ring portion 81 and the ring portion 81 sandwiched between the upper end surface of the support shaft 41 in a state where the leaf spring 8 is in contact with the washer 7, and comes into contact with the heating power adjustment lever 6. A plurality of (three in this embodiment) spring piece portions 82. An annular receiving seat 43 projects from the upper surface of the second valve casing 4 so as to surround the support shaft 41, and the heating power adjusting lever 6 is disposed around the shaft support hole 61 with the leaf spring 8 and the receiving seat. 43 between them.

  In this embodiment, the washer 7 is fixed by screwing a screw 71 integral with the washer 7 into a screw hole formed at the center of the support shaft 41. However, the fixing method of the washer 7 is not limited to this. . For example, the washer 7 is fixed with a separate screw, or a small diameter shaft portion penetrating the washer 7 is provided at the upper end of the support shaft 41, and the small diameter shaft portion is caulked to fix the washer 7 May be.

  Here, when the thermal power adjusting lever 6 is swung to the minimum thermal power position and the needle valve 5 is retracted to the minimum throttle position, the needle valve 5 is pressed in the forward direction by the upstream gas pressure. Without the leaf spring 8, the needle valve 5 is pushed and displaced in the forward direction while moving the heating power adjusting lever 6, and the gas flow rate at the minimum heating power becomes unstable. On the other hand, in this embodiment, the thermal power adjusting lever 6 does not move from the minimum thermal power position by the frictional force generated by the pressing force of the leaf spring 8, and the needle valve 5 is held at the minimum throttle position, and the gas at the minimum thermal power is obtained. The flow rate is stable.

  By the way, when the heating power adjustment lever 6 is operated, a force in the vertical direction is applied to the heating power adjustment lever 6, or the torsional torque is applied to the latter half due to the fact that the first half of the heating power adjustment lever 6 is offset upward with respect to the second half. The fire power adjusting lever 6 may be tilted with respect to a plane orthogonal to the support shaft 41. In this case, when the thermal power adjustment lever 6 is tilted to the maximum tilt angle defined by the gap amount between the washer 7 and the thermal power control lever 6, some of the spring pieces 82 of the leaf spring 8 are bent in the compression direction to the limit. Therefore, the leaf spring 8 is loosened due to fatigue due to the repetition. When the leaf spring 8 is set loose, the pressing force of the leaf spring 8 is reduced, the needle valve 5 cannot be held at the minimum throttle position, and the gas flow rate at the minimum heating power becomes unstable.

  Therefore, in this embodiment, the tilt angle of the thermal power adjustment lever 6 with respect to the plane orthogonal to the support shaft 41 is equal to or less than a predetermined angle smaller than the maximum tilt angle defined by the gap amount between the washer 7 and the thermal power control lever 6. Stopper means for limiting to the above is provided. That is, a projection 83 is formed on the leaf spring 8 so as to be sandwiched between the heating power adjustment lever 6 and the washer 7 in a state where the tilt angle of the heating power adjustment lever reaches the predetermined angle. Is configured. More specifically, each spring piece portion 82 of the leaf spring 8 is formed with a protruding portion 83 that protrudes upwardly so as to be positioned at a tip portion that contacts the heating power adjustment lever 6.

  According to this, before the tilt angle of the thermal power adjustment lever 6 reaches the maximum tilt angle, the projection 83 is sandwiched between the thermal power control lever 6 and the washer 7, and the thermal power control lever 6 does not tilt any further. . Therefore, the leaf spring 8 is not bent to the limit, and the leaf spring 8 can be prevented from being loosened due to fatigue as much as possible. Further, since the protrusion 83 is formed on each spring piece 82, the spring piece 82 located on the side compressed by this tilt is bent to the limit, regardless of the direction in which the heating power adjustment lever 6 is tilted. It can block | prevent with the projection part 83 formed in this spring piece part 82, and can prevent the settling of all the spring piece parts 82. FIG. Therefore, the leaf spring 8 can keep the pressing force necessary to hold the needle valve 5 at the minimum throttle position for a long period of time, and can stabilize the gas flow rate at the minimum heating power.

  In the first embodiment, the projection 83 is formed at the tip of each spring piece 82. However, as in the second embodiment shown in FIG. You may form the projection part 83 which comprises these.

  However, if the protrusion 83 is formed on the spring piece 82, the spring characteristics of the spring piece 82 change due to the influence of the protrusion 83, and the design of the leaf spring 8 becomes troublesome. For example, in the first embodiment, it is necessary to lengthen the tip of the spring piece 82 so that the projection 83 can be formed, and the length of the intermediate portion that is the effective spring portion of the spring piece 82 is shortened accordingly. Thus, the spring characteristics change. Moreover, in the said 2nd Embodiment, the rigidity of the intermediate part of the spring piece part 82 becomes high by forming the projection part 83, and a spring characteristic changes.

  Therefore, in the third embodiment shown in FIG. 4, a plurality of leaf springs 8 project radially from a portion located between the spring piece portions 82 on the outer periphery of the ring portion 81, and do not always contact the heating power adjustment lever 6. The tongue pieces 84 are provided, and each tongue piece 84 is formed with a projection 83 constituting stopper means. In addition, although the projection part 83 of 3rd Embodiment is an upward convex thing, a downward convex thing may be sufficient.

  According to the third embodiment, no matter which direction the heating power adjusting lever 6 tilts, the tongues positioned on both sides in the circumferential direction of the spring piece 82 positioned on the compression side before the tilting angle reaches the maximum tilting angle. The protrusion 83 of the piece 84 is sandwiched between the heating power adjusting lever 6 and the washer 7, and the heating power adjusting lever 6 is not tilted any further, and the spring piece 82 located on the compression side is bent to the limit. I can stop. Therefore, even in this case, the settling of all the spring pieces 82 can be prevented. Further, unlike the case where the protrusion 83 is formed on the spring piece 82, there is an advantage that the spring characteristic of the spring piece 82 is not changed by the protrusion 83 and the design of the leaf spring 8 is facilitated.

  In the third embodiment, each tongue piece 84 is always separated from the heating power adjusting lever 6 and the washer 7. However, as in the fourth embodiment shown in FIG. You may form so that it may contact | abut. In this case, each tongue piece 84 is formed with a downwardly protruding protrusion 83, and before the heating power adjustment lever 6 is tilted to the maximum tilting angle, the heating power adjustment lever 6 is brought into contact with the protrusion 83 and tilted further. To be prevented.

  The embodiment in which the stopper means is configured by the protrusion 83 formed on the leaf spring 8 has been described above, but the stopper means is not limited to this. For example, as in the fifth embodiment shown in FIG. 6, the washer 7 is formed with a protrusion 72 that contacts the heating power adjustment lever 6 in a state where the inclination angle of the heating power adjustment lever 6 reaches a predetermined angle smaller than the maximum inclination angle. However, the protrusion 72 may constitute stopper means. Further, as in the sixth embodiment shown in FIG. 7, the heating power adjusting lever 6 is formed with a protrusion 65 that contacts the washer 7 in a state where the tilting angle of the heating power adjusting lever 6 reaches a predetermined angle smaller than the maximum tilting angle. However, this protrusion 65 may constitute stopper means.

  In the fifth embodiment and the sixth embodiment, the protrusions 72 and 65 are formed so as to be located at the center in the circumferential direction between the spring pieces 82 of the leaf spring 8. However, if the relative position in the circumferential direction between the projections 72 and 65 and the spring piece 82 is deviated due to the phase shift of the leaf spring 8, a design value in which some of the spring pieces 82 are defined by the projections 72 and 65 is used. There is a possibility of bending more than. On the other hand, if the protrusion 83 is formed on the leaf spring 8 as in the first to fourth embodiments, it is advantageous that the above-described problems do not occur even if the leaf spring 8 is out of phase.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the support shaft 41 is integrally provided on the outer surface of the second valve casing 4, but a separate support shaft may be fixed to the outer surface of the second valve casing 4. . Further, it is possible to use a plate spring 8 other than the above embodiment such as a disc spring.

DESCRIPTION OF SYMBOLS 4 ... Valve casing, 41 ... Support shaft, 5 ... Needle valve, 6 ... Thermal power adjustment lever, 61 ... Shaft support hole, 65 ... Projection formed in thermal power adjustment lever, 7 ... Washer, 72 ... Projection formed in washer 8 ... leaf springs, 81 ... ring portions, 82 ... spring piece portions, 83 ... projections formed on the leaf springs, 84 ... tongue piece portions.

Claims (6)

The needle valve is provided in the valve casing so as to be able to advance and retreat, and a thermal power adjustment lever that is pivotally supported by a support shaft fixed to the outer surface of the valve casing. A thermal power control device that moves the valve back and forth to increase or decrease the gas flow rate through the needle valve,
The washer with a diameter larger than the shaft support hole at the base end of the thermal power adjustment lever with which the support shaft is fitted is fixed to the outer end of the support shaft so that a clearance in the axial direction of the support shaft is created between the washer and the thermal power adjustment lever. And a leaf spring that presses the heating power adjustment lever toward the valve casing is interposed between the washer and the heating power adjustment lever.
It is provided with stopper means for limiting the tilt angle of the thermal power adjusting lever with respect to the plane orthogonal to the support shaft to a predetermined angle smaller than the maximum tilt angle defined by the gap amount between the washer and the thermal power adjusting lever. To adjust the thermal power.   The leaf spring is provided with a protrusion that is sandwiched between the heat adjustment lever and the washer in a state where the tilt angle of the heat adjustment lever reaches the predetermined angle, and the protrusion constitutes the stopper means. The thermal power control apparatus according to claim 1, wherein:   3. The thermal power control apparatus according to claim 2, wherein the leaf spring includes a ring portion that contacts the washer and a plurality of spring piece portions that project radially from a plurality of locations on the outer periphery of the ring portion and contact the thermal power control lever. And the protrusion is formed on each spring piece.   3. The thermal power control apparatus according to claim 2, wherein the leaf spring includes a ring portion that contacts the washer and a plurality of spring piece portions that project radially from a plurality of locations on the outer periphery of the ring portion and contact the thermal power control lever. The leaf spring is provided with a plurality of tongue pieces projecting radially from the portions located between the respective spring pieces on the outer periphery of the ring portion and not normally contacting the heating power adjustment lever. The thermal power control apparatus according to claim 1, wherein the protrusion is formed on one part.   A protrusion is formed on the washer to contact the heating power adjustment lever in a state where the tilt angle of the heating power adjustment lever reaches the predetermined angle, and the stopper means is configured by the protrusion. Item 2. The thermal power control apparatus according to Item 1. The thermal power control lever is formed with a protrusion that contacts the washer in a state where the tilt angle of the thermal power control lever reaches the predetermined angle, and the stopper means is configured by the protrusion. Item 2. The thermal power control apparatus according to Item 1.

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