JP7020985B2 - Thermal power adjustment device for parent and child burners - Google Patents

Description

The present invention relates to a thermal power adjusting device for a parent-child burner that regulates the thermal power of a parent-child burner having a parent burner and a child burner.

Conventionally, as a thermal power adjusting device for a parent-child burner of this type, a closure and a casing having a closure storage portion for rotatably storing the closure are provided, and the closure is supplied with gas to the parent burner and the child burner. By rotating in one direction from the fire extinguishing position where the fire is stopped, it is possible to switch between a state in which gas is supplied to the parent burner and the child burner and a state in which gas supply to the parent burner is stopped and gas is supplied only to the child burner. What you did is known.

In this product, when the amount of gas supplied to the parent burner is reduced from the state of supplying gas to the parent burner and the child burner to the state of supplying gas only to the child burner, gas is ejected from the flame hole of the parent burner. The speed is lower than the combustion speed, and flashback is likely to occur.

Therefore, conventionally, Patent Document 1 proposes a method provided with a click mechanism that gives a click feeling to the rotation operation of the closure on both sides of the rotation range (flashback region) of the closure that tends to cause flashback in the parent burner. ing. According to this, the closing operation can be vigorously rotated from one side to the other side of the flashback region against the click feeling, and the flashback in the parent burner can be prevented.

However, when the closure is slowly rotated, the click mechanism does not work well, and the closure may slowly rotate in the flashback region, causing flashback in the parent burner.

Japanese Unexamined Patent Publication No. 2016-156606

In view of the above points, it is an object of the present invention to provide a thermal power adjusting device for a parent-child burner capable of improving the certainty of preventing flashback in the parent burner.

In order to solve the above problems, the present invention is a thermal power adjusting device for a parent-child burner that adjusts the thermal power of a parent-child burner having a parent burner and a child burner having a maximum thermal power smaller than that of the parent burner , and has a taper on the outer peripheral surface. A fire extinguisher is provided with a closed child and a casing having a closed child storage portion with a tapered inner peripheral surface for storing the closed child rotatably, and the closed child is extinguished to stop gas supply to the parent burner and the child burner. By rotating from the position to one of the circumferential directions, it is possible to switch between the state of supplying gas to the parent burner and the child burner and the state of stopping the gas supply to the parent burner and supplying gas only to the child burner. A concave groove for the parent burner that is recessed from the outer peripheral surface of the closed child is formed in the closed child, and the parent is formed according to the degree of overlap of the concave groove for the parent burner with the passage hole for the parent burner that opens on the peripheral wall surface of the closed child storage portion. In the case where the amount of gas supplied to the burner is increased or decreased, the other end edge in the circumferential direction of the concave groove for the parent burner and the one end edge in the circumferential direction of the passage hole for the parent burner each have a straight portion and have a straight portion. At the predetermined rotation position of the closure, which is the boundary between the state of supplying gas to the parent burner and the child burner and the state of supplying gas only to the child burner, both ends are lined at the straight part of both ends over a predetermined length. It is characterized by being formed to be in contact with each other.

According to the present invention, the degree of overlap of the groove for the parent burner with the passage hole for the parent burner suddenly increases by simply rotating the closure from the predetermined rotation position in the other direction in the circumferential direction, and the supply to the parent burner is supplied. When the amount of gas suddenly increases from zero and the closure is rotated in one direction in the circumferential direction from the position in front of the closure toward the predetermined rotation position, the degree of overlap of the groove for the parent burner with the passage hole for the parent burner suddenly increases. The amount of gas supplied to the parent burner drops sharply to zero. Therefore, the flashback region, which is the rotation range of the closed child that tends to cause flashback in the parent burner, is narrowed. Therefore, even if the closure is slowly rotated, the flashback region is passed in a short time, the flashback is less likely to occur in the parent burner, and the certainty of flashback prevention can be improved.

A perspective view of an example of a parent-child burner. The cut side view of the parent-child burner of FIG. The perspective view of the thermal power adjustment device for a parent-child burner of embodiment of this invention. The perspective view of the disassembled state of the thermal power control device for a parent-child burner of an embodiment. The cut side view cut by the electromagnetic safety valve arrangement part of the thermal power control device for a parent-child burner of an embodiment. FIG. 5 is a cut plan view cut along the VI-VI line of FIG. The cut side view cut by the VII-VII line of FIG. (A) (b) (c) A cut plan view of a main part at a fire extinguishing position, an ignition position and a minimum thermal power position of a closed child. The graph which shows the relationship between the rotation angle of a closure and the amount of gas supplied to a parent burner and a child burner. (A) A cut plan view of a main part at a predetermined rotation position of the closure, (b) an enlarged cross-sectional view cut along the line Xb-Xb of FIG. 10 (a). Perspective view of the closed child.

With reference to FIGS. 1 and 2, reference numeral 1 denotes a parent-child burner provided on the stove. The parent-child burner 1 includes a parent burner 2 and a child burner 3 adjacent to the lower side of the parent burner 2. Specifically, the parent-child burner 1 includes a burner body 11 having a triple inner and outer cylinders of an outer cylinder 111, an intermediate cylinder 112, and an inner cylinder 113, and an intermediate cylinder 112. A burner head 12 having an inner annular hanging wall 121 fitted to, an upper annular wall 122 on the upper surface of the outer peripheral portion, and a lower annular wall 123 on the lower surface of the outer peripheral portion seated on the upper end portion of the outer tubular body 111, and the inner side. It has an annular hanging wall 131 on the inner circumference that fits into the tubular body 113, and includes a burner cap 13 that sits on the upper end of the upper annular wall 122 on the lower surface of the outer peripheral portion. The parent burner 2 is composed of the intermediate cylinder 112, the inner cylinder 113, the burner head 12, and the burner cap 13, and the child burner 3 is composed of the outer cylinder 111, the intermediate cylinder 112, and the burner head 12.

Further, a mixing pipe (parent burner mixing pipe) 21 communicating with the space between the intermediate cylinder 112 and the inner cylinder 113 which is the internal space of the parent burner 2 is provided, and the outer cylinder which is the internal space of the child burner 3 is provided. A mixing pipe (child burner mixing pipe) 31 communicating with the space between the body 111 and the intermediate cylinder 112 is provided. Further, a flame hole (parent burner flame hole) 22 for the parent burner 2 from which the air-fuel mixture (mixed gas of fuel gas and primary air) from the parent burner mixing pipe 21 is ejected is provided on the upper annular wall 122 of the burner head 12. A plurality of flame holes (child burner flame holes) 32 for the child burner 3 are formed at intervals in the circumferential direction, and the air-fuel mixture from the child burner mixing tube 31 is ejected into the lower annular wall 123 of the burner head 12. Are formed in multiples with an interval in the circumferential direction. The total opening area of the child burner flame hole 32 is smaller than the total opening area of the parent burner flame hole 22, and the maximum thermal power of the child burner 3 is smaller than that of the parent burner 2. Further, a target portion 124 facing the ignition electrode (not shown) is provided so as to project at one location around the outer peripheral surface of the burner head 12.

In the gas supply path 4 for supplying fuel gas to the parent-child burner 1, the thermal power adjusting device 5 for the parent-child burner according to the embodiment of the present invention is interposed. Hereinafter, the thermal power adjusting device 5 will be described with reference to FIGS. 3 to 7. The thermal power control device 5 has an electromagnetic safety valve 52 provided in a casing 51 having a gas inlet 511, a gas outlet 512 for a parent burner, and a gas outlet 513 for a child burner, and a tapered outer peripheral surface. It is equipped with a closure 53. The electromagnetic safety valve 52 and the closure 53 are operated by an operation shaft 54 having an operation knob exposed on the stove top plate (not shown) attached to the upper end portion. The operation shaft 54 is inserted and supported by a support frame 514 attached to the upper surface of the casing 51.

The electromagnetic safety valve 52 is a valve body 522 facing the valve seat 521a at one end of the valve chamber 521 in the casing 51 communicating with the gas inflow port 511, and a valve that urges the valve body 522 in the closing direction approaching the valve seat 521a. The spring 523, the suction piece 524 connected to the valve body 522 via the valve shaft 522a extending in the opening direction away from the valve seat 521a, the electromagnet 525 facing the suction piece 524, and the valve body 522 can be pressed in the opening direction. A push rod 526 and a lever 527 pivotally attached to a bracket 515 fixed to the casing 51 so as to face the outer end of the push rod 526 are provided. A push plate 541 that abuts on the lever 527 and swings it in the pushing direction of the push rod 526 when the lever 527 is pushed down is attached to the operation shaft 54. Further, an ignition switch 55 including a micro switch for detecting the downward movement of the push plate 541 is attached to the casing 51. Then, by pushing down the operation shaft 54, the ignition switch 55 is turned on to start the ignition operation, that is, the spark discharge at the ignition electrode, and the valve body 522 via the push plate 541, the lever 527, and the push rod 526. By pushing the suction piece 524 to the valve opening position where the suction piece 524 abuts on the electromagnet 525 and energizing the electromagnet 525 in this state, the valve body 522 is sucked and held at the valve opening position even if the operating shaft 54 is released from being pushed down. I am trying to do it. However, if the electromotive voltage of the thermocouple, which is a flame detection element (not shown) attached to the parent-child burner 1, does not rise to a predetermined level even after a predetermined waiting time has elapsed from the start of the ignition operation, the energization of the electromagnet 525 is stopped. , The valve body 522 is returned to the closed position where it is seated on the valve seat 521a by the urging force of the valve spring 523, that is, the electromagnetic safety valve 52 is closed, and the electromotive voltage of the thermocouple is at a predetermined level due to the misfire of the parent and child burner 1. Even when the voltage drops below, the energization of the electromagnet 525 is stopped and the electromagnetic safety valve 52 is closed.

The closure 53 is rotatably stored in the closure storage portion 531 having a tapered inner peripheral surface formed in the casing 51. A pin 542 protruding in the radial direction is fixed to the operation shaft 54. Then, a connector 543 having an engaging groove 543a with which the pin 542 is movably engaged vertically and an engaging portion 543b engaging with the recessed portion 538 at the upper end of the closure 53 is provided, and the operating shaft 54 is provided with a connector 543. The closure 53 is rotated via the pin 542 and the connector 543 by rotation. Further, a spring 544 for urging the operation shaft 54 upward via the pin 542 is provided, and a guide plate 545 for guiding the operation of the operation shaft 54 in cooperation with the pin 542 is provided under the bracket 515. .. The guide plate 545 engages with the engagement groove 545a to which the pin 542 engages from below when the closure 53 is in the fire extinguishing position described later, and the pin 542 in the state where the closure 53 is in the ignition position described later. The click groove 545b for obtaining a click feeling and the click recess 545c recessed upward for engaging the pin 542 to obtain a click feeling while the closure 53 is present on both sides of the flashback region described later. It is formed. In the state where the closure 53 is in the fire extinguishing position, the operation shaft 54 cannot be rotated unless the operation shaft 54 is pushed down and the pin 542 is disengaged below the engagement groove 545a.

Further, on the upper portion of the closing storage portion 531 of the casing 51, a first stopper portion 546 ₁ to which the pin 542 abuts with the closing member 53 in the fire extinguishing position and a pin with the closing member 53 in the ignition position. A second stopper portion 546 ₂ having a slightly lower height with which the 542 abuts is provided, and a third stopper portion 546 ₃ with which the pin 542 abuts while the closure 53 is present at the minimum thermal power position described later. When the closed child 53 is rotated by 80 ° in one circumferential direction (counterclockwise when viewed from above) with the operation shaft 54 pushed down from the state where the closed child 53 is in the fire extinguishing position, the closed child 53 reaches the ignition position and the pin 542 is released. It comes into contact with the second stopper 546 ₂ . Next, when the operation shaft 54 is rotated in one direction in the circumferential direction with the push-down released, the pin 542 gets over the _second stopper 5462 and is rotated 70 ° from the ignition position to bring the closure 53 to the minimum thermal power position. Upon reaching, the pin 542 abuts on the third stopper 546 ₃ .

A common passage hole 532 communicating with the downstream side of the electromagnetic safety valve 52 and a passage hole 533 for the parent burner communicating with the gas outlet 512 for the parent burner are opened on the peripheral wall surface of the closed child storage portion 531. The lower space of the closed child storage portion 531 communicates with the gas outlet 513 for the child burner. The closure 53 has a shaft hole 534 communicating with the lower space of the closure storage portion 531 and three concave grooves recessed from the outer peripheral surface, that is, a concave groove 535 for a parent burner, a common concave groove 536, and a child burner. A concave groove 537 is formed, and each of the concave grooves 535, 536, 537 communicates with the shaft hole 534 via the radial holes 535a, 536a, 537a. The hole 537a communicating with the concave groove 537 for the child burner is formed to have a small diameter.

When the closed child 53 is in the fire extinguishing position, as shown in FIG. 8A, any of the concave grooves 535, 536, 537 for the parent burner, the shared and the child burner do not overlap the common passage hole 532, and the parent. No gas flows to the gas outlets 512 and 513 for both the burner and the child burner. When the closure 53 is in the ignition position, as shown in FIG. 8B, the parent burner concave groove 535 overlaps the parent burner passage hole 533 in a fully open state, and the common concave groove 536 overlaps the common passage hole 532. It overlaps in the fully open state, and the thermal power of the parent burner 2 and the child burner 3, that is, the supply gas amount becomes a predetermined maximum amount (Qpmax for the parent burner 2 and Qcmax for the child burner 3). When the closure 53 is in the minimum thermal power position, as shown in FIG. 8 (c), both concave grooves 535 and 536 shared with the parent burner overlap with both the passage holes 532 and 533 shared with the parent burner. Instead, only the concave groove 537 for the child burner overlaps with the common passage hole 532, the gas supply to the parent burner 2 is stopped, and the amount of gas supplied to the child burner 3 becomes a predetermined minimum amount Qcmin.

FIG. 9 shows the relationship between the rotation angle of the closure 53 and the amount of gas supplied to the parent burner 2 and the child burner 3. As the degree of overlap of the groove 535 for the parent burner with the passage hole 533 for the parent burner increases due to the rotation of the closed child 53 from the fire extinguishing position in one direction in the circumferential direction, the maximum amount of gas supplied to the parent burner 2 is Qpmax. As the degree of overlap of the concave groove 535 for the parent burner with respect to the passage hole 533 for the parent burner decreases due to the rotation of the closure 53 in one direction in the circumferential direction from the ignition position, the number gradually increases toward the parent burner 2. When the amount of gas supplied from the fire extinguishing position gradually decreases from the maximum amount Qpmax and the rotation angle from the fire extinguishing position becomes less than 120 °, the gas supply to the parent burner 2 is stopped.

Here, when the amount of gas supplied to the parent burner 2 becomes equal to or less than a predetermined amount (for example, the maximum amount Qcmax of the child burner 3), the gas ejection speed from the parent burner flame hole 22 falls below the combustion speed, causing flashback. It will be easier. Therefore, the click recesses 545c give a click feeling to the rotation operation of the operation shaft 54 on both sides of the flashback region, which is the rotation range of the closure 53 that tends to cause flashback in the parent burner 2. According to this, the operation shaft 54 can be vigorously rotated from one side to the other side of the flashback region against the click feeling, and the flashback in the parent burner 2 can be prevented to some extent.

However, when the operation shaft 54 is slowly rotated, the click feeling cannot be obtained well, and the closure 53 slowly rotates in the flashback region, causing flashback in the parent burner 2. be. Therefore, in the present embodiment, the other end edge 535b in the circumferential direction of the concave groove 535 for the parent burner and the one end edge 533a in the circumferential direction of the passage hole 533 for the parent burner each have a straight line portion, and the parent burner 2 and the child At a predetermined rotation position θa of the closure 53, which is a boundary between the state of supplying gas to the burner 3 and the state of supplying gas only to the child burner 3, both end edges 535b and 533a have a predetermined length as shown in FIG. It is formed so as to make line contact at the straight portions of both end edges . Note that FIG. 11 shows the shape of the concave groove 535 for the parent burner.

According to this, unlike the conventional one in which the other end edge in the circumferential direction of the concave groove for the parent burner and one end edge in the circumferential direction of the passage hole for the parent burner are in point contact at the predetermined rotation position θa, the closure is closed. By simply rotating 53 slightly in the other direction in the circumferential direction from the predetermined rotation position θa, the degree of overlap of the parent burner recessed groove 535 with the parent burner passage hole 533 suddenly increases, and the amount of gas supplied to the parent burner 2 becomes zero. Rapidly increase from. Further, when the closure 53 is rotated in one direction in the circumferential direction from a position in front of the closing position θa toward a predetermined rotation position θa, the degree of overlap of the parent burner recessed groove 535 with the parent burner passage hole 533 suddenly decreases, and the parent The amount of gas supplied to the burner 2 drops sharply to zero. Therefore, the flashback region, which is the rotation range of the closed child 53, which tends to cause flashback in the parent burner 2, is narrowed. Therefore, even if the closure 53 is slowly rotated, the flashback region is passed in a short time, the flashback is less likely to occur in the parent burner 2, and the certainty of flashback prevention can be improved.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, the electromagnetic safety valve 52 is incorporated in the thermal power adjusting device 5, but an electromagnetic safety valve that is separate and independent from the thermal power adjusting device 5 may be provided. Further, in the parent-child burner 1 of the above embodiment, the child burner 3 is provided on the lower side of the parent burner 2, but the same applies as the thermal power adjusting device of the parent-child burner in which the child burner is arranged inside the annular parent burner. The invention can be applied.

1 ... Parent-child burner, 2 ... Parent burner, 3 ... Child burner, 5 ... Thermal power control device, 51 ... Casing, 53 ... Closed child, 513 ... Closed child storage, 533 ... Parent burner passage hole, 533a ... For parent burner One end edge in the circumferential direction of the passage hole, 535 ... The concave groove for the parent burner, 535b ... The other end edge in the circumferential direction of the concave groove for the parent burner, θa ... A predetermined rotation position.

Claims (1)

It is a thermal power adjustment device for parent and child burners that adjusts the thermal power of a parent and child burner that has a parent burner and a child burner whose maximum thermal power is smaller than the parent burner. The parent is provided with a casing having a closure housing with a taper on the inner peripheral surface, and the closure is rotated in one circumferential direction from a fire extinguishing position where gas supply to the parent burner and the child burner is stopped. It is possible to switch between the state of supplying gas to the burner and the child burner and the state of supplying gas only to the child burner by stopping the gas supply to the parent burner. A concave groove for the parent burner is formed, and the amount of gas supplied to the parent burner is increased or decreased according to the degree of overlap of the concave groove for the parent burner with the passage hole for the parent burner that opens on the peripheral wall surface of the closed child storage portion. In what you did
The other end edge in the circumferential direction of the concave groove for the parent burner and the one end edge in the circumferential direction in the circumferential direction of the passage hole for the parent burner each have a straight portion, and only in the state of supplying gas to the parent burner and the child burner and the child burner. A thermal power for a parent-child burner, characterized in that both ends are formed so as to make line contact with a straight portion of both ends over a predetermined length at a predetermined rotation position of a closed child which is a boundary with a state of supplying gas. Adjustment device.

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