JP2008281271A - Stove burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stove burner having high usability in cooking and the like by suppressing significant change of fire power in extinction and ignition of a main burner in accompany with adjustment of fire power while keeping a good combustion state. <P>SOLUTION: This stove burner comprising a main burner 1, a sub-burner 2 disposed in adjacent to the main burner 1 and having the maximum fire power smaller than that of the main burner 1, and a gas flow channel 3 supplying a fuel gas to both burners 1, 2, further comprises a gas quantity adjusting valve 4 for adjusting a gas flow rate of the gas flow channel 3, a pair of burner connection passages 6, 7 branched from a downstream side of the gas quantity adjusting valve 4 and connected with each of burners, a solenoid valve 8 for opening and closing the burner connection passage 6 of the main burner, and a control means 9 for controlling the gas quantity adjusting valve 4 and the solenoid valve 8 according the set fire power. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stove burner that integrally includes a main burner and a sub-burner having a maximum heating power smaller than that of the main burner.

  Conventionally, a main burner, an auxiliary burner adjacent to the main burner and having a maximum thermal power smaller than that of the main burner, and a gas flow path for supplying fuel gas to both burners are provided. There is known a stove burner that can be obtained and extinguishes the main burner so that a small heating power can be obtained only by the auxiliary burner (see, for example, Patent Document 1). This stove burner is provided with a main burner gas passage for supplying fuel gas only to the main burner and a sub-burner gas passage for supplying fuel gas only to the sub-burner. One needle valve is provided, and a second needle valve is provided in the gas flow path for the auxiliary burner. The opening degree of the first needle valve can be adjusted from the full opening (high fire) to the full closing (extinguishing) by the first opening degree adjusting lever, and the second needle valve can be fully opened (low heat) by the second opening degree adjusting lever. The opening can be adjusted from the minimum to the minimum (fire).

When the user sets the heating power to low or low, the first needle valve is fully closed, the main burner is extinguished, and only the sub burner is burned. By doing so, it is possible to considerably reduce the heating power of the entire stove burner and to obtain a wide heating power adjustment range.
JP-A-9-303719

  However, in the above-mentioned conventional one, when the opening degree of the first needle valve is fully closed and the main burner is extinguished, the sub burner is maintained at a relatively small heating power via the second needle valve. At the moment when the firepower of the sub-burner is changed from the firepower of, the firepower of the entire stove burner is significantly reduced.

  For this reason, it is difficult to obtain a thermal power intermediate between the minimum thermal power of both the burners and the maximum thermal power of only the sub-burner, and there is a disadvantage that the thermal power adjustment becomes discontinuous and the usability is poor during cooking.

  In view of such inconveniences, the present invention can alleviate significant fluctuations in the thermal power when the main burner is extinguished or ignited due to the adjustment of the thermal power while maintaining a good combustion state. The aim is to provide a burner.

  In order to achieve the above object, the present invention provides a stove comprising a main burner, a sub burner adjacent to the main burner and having a maximum thermal power smaller than that of the main burner, and a gas flow path for supplying fuel gas to both burners. In the burner, a gas amount adjusting valve that adjusts the gas flow rate in the gas flow path, a pair of burner connecting passages that are branched from the downstream side of the gas amount adjusting valve and connected to each burner, and both burners are burned The solenoid valve that opens to open the burner connection path of the main burner and closes the burner connection path of the main burner when only the auxiliary burner burns, and according to the set thermal power set by the user Control means for controlling the gas amount adjusting valve and the electromagnetic valve is provided.

  The stove burner of the present invention includes a main burner and a sub burner, and fuel gas having a flow rate adjusted by the gas amount adjusting valve in the gas flow path is supplied to both burners via each burner connection path. Is done. At this time, the fuel gas is distributed to the burner connection path of the main burner and the burner connection path of the sub burner according to the ratio of the maximum thermal power (capacity) between the main burner and the sub burner, and both the burners are in good combustion state. Form.

  If the set heating power is changed to a smaller side by the user while both burners are burning, the control means controls the gas amount adjusting valve to reduce the heating power of both burners. When the set heating power is further changed to the small side, the control means closes the solenoid valve. As a result, the main burner is extinguished and only the sub-burner is in a combustion state. Even in the state where only the sub-burner burns, the gas amount control valve is controlled by the control means in accordance with the set thermal power, so that extremely small thermal power (so-called hot fire) can be obtained, and a wide thermal power control range can be obtained. it can.

  Further, the burner connection path of the main burner and the burner connection path of the sub burner branch from the downstream side of the gas amount control valve, so that when the solenoid valve is closed, the fuel gas supplied to the main burner is cut off. Thus, the gas flow rate in the burner connection path of the secondary burner increases instantaneously. As a result, the heating power of the sub-burner immediately after the main burner extinguishes increases instantaneously, and a significant reduction in the heating power of the entire stove burner is alleviated, and a heating power adjustment range with less fluctuation in heating power can be obtained.

  Furthermore, when only the secondary burner is burning, the set thermal power is changed to the large side by the user, and when both burners need to be burned to obtain the set thermal power at this time, the control means opens the solenoid valve. Let me speak. Thereby, the main burner is ignited and both burners are in a burned state. In a state where both burners are combusted, when the set heating power is further changed to the larger side, the gas amount adjusting valve is controlled by the control means, and the heating power of both burners is increased.

  When the solenoid valve is opened and fuel gas supply to the burner connection path of the main burner is started, the gas flow rate in the burner connection path of the sub burner is instantaneously reduced. As a result, the heating power of the sub-burner immediately after the main burner starts combustion is instantaneously reduced, and a significant increase in the heating power of the entire burner is alleviated, and a heating power adjustment range with less fluctuation of the heating power can be obtained.

  Further, in the present invention, the control means opens the solenoid valve in response to the change in the set thermal power, and responds to the changed set thermal power from the combustion state of only the sub-burner corresponding to the set thermal power before the change. When the heating power of the auxiliary burner after changing the set thermal power becomes smaller than that before the set thermal power is changed, the control means is the auxiliary burner for a predetermined time immediately after the solenoid valve is opened. It is preferable to control the gas amount adjusting valve so that the heating power is smaller than before the set thermal power is changed and is larger than after the set thermal power is changed.

  When the set heating power is changed and the control means opens the solenoid valve, the combustion state of only the auxiliary burner shifts to the combustion state of both burners. At this time, if the combustion of the main burner is added to the combustion of the sub-burner, the fuel gas in the gas flow path is distributed to both burners, and the heating power of the sub-burner becomes smaller than before the transition (before the set heating power is changed).

  By the way, while only the auxiliary burner is burning and the solenoid valve is closed, the fuel gas in the burner connection path of the main burner may be replaced with air. The air in the burner connection path of the main burner is pushed out to the fuel gas immediately after the solenoid valve is opened, but the air completely escapes from the burner connection path of the main burner and the fuel gas reaches the main burner. Until then, the secondary burner may not be able to maintain combustion and may extinguish. Therefore, the control means controls the gas amount adjusting valve to perform a predetermined time (for example, a time during which the residual air in the burner connection path of the main burner is pushed out by the fuel gas) immediately after the solenoid valve is opened. The heating power of the sub-burner is set to be smaller than that before the set heating power is changed and is set to be greater than that after the setting heating power is changed. In this way, the heating power of the sub-burner can be prevented from suddenly decreasing immediately after the solenoid valve is opened, and inadvertent fire extinguishing of the sub-burner immediately after the solenoid valve is opened can be prevented. The combustion state of the auxiliary burner can be reliably maintained for a predetermined time immediately after the valve.

  Further, in the present invention, the control means closes the solenoid valve according to the change in the set thermal power, and corresponds to the set thermal power after the change from the combustion state by both burners corresponding to the set thermal power before the change. When the combustion state of only the sub-burner is changed and the heating power of the sub-burner after the set heating power is changed becomes larger than that before the setting heating power is changed, the control means performs the sub-burner for a predetermined time immediately before the solenoid valve is closed. It is preferable to control the gas amount adjusting valve so that the heating power becomes larger than before the set thermal power change and becomes smaller after the set thermal power change.

  When the set heating power is changed and the control means closes the solenoid valve, the combustion state of both burners shifts to the combustion state of only the auxiliary burner. At this time, if the main burner extinguishes and only the sub-burner burns, the fuel gas supplied to the main burner is supplied to the sub-burner, so the sub-burner's thermal power is before the transition (before the set thermal power is changed) Become bigger.

  Here, when the solenoid valve is closed while both the burners are burning in the process in which the set thermal power is changed from large to small, the inventor makes a sudden gas in the burner connection path of the sub-burner. Primary air inhalation (primary air inhalation by the ejector installed in the burner connection path) cannot catch up with the increase in flow rate, and yellow flames (such as generation of soot) due to shortage of primary air in the sub burner for a very short time. It was found that it occurred. Based on this knowledge, in the present invention, the heating power of the sub-burner is set to be larger than that before the set heating power is changed for a predetermined time immediately before the closing of the solenoid valve (for example, the time when the speed of the sucked primary air is sufficiently increased). And smaller than after the set thermal power is changed. Thereby, prior to the closing of the solenoid valve, a state is formed in which the primary air amount to the sub-burner is increased together with the gas flow rate. If the solenoid valve is closed in this state, the main burner Yellow flames (eg, generation of soot) due to shortage of primary air immediately after extinguishing can be prevented, and combustion of the auxiliary burner can be maintained in a good state.

  An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the stove burner of the present embodiment includes a main burner 1 and a sub-burner 2 having a maximum heating power smaller than that of the main burner 1. In the gas flow path 3 for supplying the fuel gas to both the burners 1 and 2, a gas amount adjusting valve 4 that adjusts the gas flow rate according to the set heating power (high fire, medium fire, low fire, hot fire etc.) set by the user. Is provided. The gas flow path 3 on the downstream side of the gas amount adjusting valve 4 includes a main burner connection path 6 for sending the fuel gas to the main burner 1 and a sub burner connection path 7 for sending the fuel gas to the sub burner 2 via the branch portion 5. It is branched to. An electromagnetic valve 8 is provided in the main burner connection path 6 so that the supply of fuel gas to the main burner 1 can be started or interrupted instantaneously by opening and closing the electromagnetic valve 8.

  The gas amount adjusting valve 4 and the electromagnetic valve 8 are connected to a control means 9 such as a microcomputer. The control means 9 operates the gas amount adjusting valve 4 and the electromagnetic valve 8 according to the set heating power of the operation unit 10 operated by the user. A safety valve 11 is provided on the upstream side of the gas amount adjusting valve 4.

  Next, a detailed configuration will be described. The stove burner of this embodiment includes a burner body 12 shown in FIGS. The main burner 1 is provided in the burner head portion of the burner body 12, and the sub burner 2 is provided adjacent to the lower side of the main burner 1. The main burner 1 includes a plurality of flame outlets (first flame mouths 13) arranged in the circumferential direction. The auxiliary burner 2 also includes a plurality of flame outlets (second flame outlets 14) over its entire circumference, but the total area of the second flame outlet 14 provided in the auxiliary burner 2 is the first flame mouth 13 of the main burner 1. Is less than the total area.

  The main burner 1 is integrally provided with a main burner mixing pipe 15 that constitutes a part of the downstream side of the main burner connection path 6. The sub-burner 2 is integrally provided with a sub-burner mixing pipe 16 that constitutes a part of the downstream side of the sub-burner connection path 7. Nozzles 17 and 18 for jetting fuel gas are opposed to the upstream ends of the burner mixing pipes 15 and 16, and temporary air is sucked by the ejector together with the fuel gas. The nozzle 17 provided in the main burner connection path 6 is set to have a larger nozzle diameter than the nozzle 18 provided in the sub burner connection path 7, and the maximum combustion amount of the main burner 1 is larger than that of the sub burner 2. The sub-burner mixing pipe 16 is formed to be narrower than the main burner mixing pipe 15 so as to correspond to the amount of combustion.

  In the present embodiment, the gas amount adjusting valve 4 is provided in a valve unit 19 as shown in FIG. The valve unit 19 is integrally provided with the gas amount adjusting valve 4 and the safety valve 11. The safety valve 11 incorporates a solenoid and a spring in the solenoid unit 20. When the solenoid is energized, the valve body 21 is driven in the valve opening direction against the biasing force of the spring, and the gas flow path 3 is opened. On the contrary, when the energization to the solenoid is stopped, the magnetic force by the solenoid disappears, the valve body 21 is returned in the valve closing direction by the biasing force of the spring, and the gas flow path 3 is closed.

  As shown in FIG. 5, the gas amount adjusting valve 4 is mainly composed of a rotating plate 22, a fixed plate 23, and an orifice plate 24. As shown in FIG. 4, the rotating plate 22 is rotated by a rotating shaft 27 connected to a drive shaft 26 of the stepping motor 25. The stepping motor 25 is rotationally driven by a pulse signal supplied from the control means 9 shown in FIG. The pulse signal at this time corresponds to the set thermal power in the operation unit 10.

  As shown in FIG. 4, the fixing plate 23 is fixed to the casing of the valve unit 19. As shown in FIG. 5, the rotary plate 22 has elongated holes 28 along the rotation direction, and the fixed plate 23 has a plurality of different sizes (in this embodiment, along the locus of the elongated holes 28). 5) through-holes 29 are formed. When the stepping motor 25 is driven to rotate the rotating plate 22, the long holes 28 sequentially coincide with the through holes 29, and the fuel gas passes through the through holes 29 that coincide with the long holes 28. At this time, by forming the long hole 28 to a length that matches the combination of the plurality of through holes 29, the combination of the through holes 29 that match the long hole 28 is sequentially switched as the rotating plate 22 rotates. . In addition, since it is necessary to change the gas supply amount according to the gas type when the gas type is different, the replacement of the orifice hole 30 having a flow rate according to the gas type corresponding to the through hole 29 of the fixing plate 23 is performed. A free orifice plate 24 is superposed on the upper surface of the fixed plate 23 via a packing 31. As a result, when the rotating plate 22 is rotated, the through holes 29 through which the gas passes are sequentially selected, and the amount of fuel gas adjusted by the through holes 29 and the orifice holes 30 is supplied to the burners 1 and 2.

  Although not shown in detail, the solenoid valve 8 is configured to include a solenoid and a spring in substantially the same manner as the safety valve 11. Referring to FIG. 1, the solenoid valve 8 is opened by energization to open the main burner connection path 6. The main burner connection path 6 is closed by opening and closing by energization stop.

  Next, the operation of the stove burner of this embodiment will be described. Referring to FIGS. 1 and 6, in the state where the set thermal power is maximum (high fire), the gas flow rate L to the main burner 1 and the gas flow rate S to the sub-burner 2 are maximized. Both the auxiliary burner 2 are in a combustion state. At this time, the gas amount adjusting valve 4 is set to the maximum valve opening, and the electromagnetic valve 8 is maintained in the open state by a command from the control means 9.

  From this state, when the set heating power in the operation unit 10 is changed from high to low, the gas amount adjusting valve 4 is actuated by the command of the control means 9, and the gas flow rate L to the main burner 1 and the sub-burner 2 are switched. The gas flow rate S is reduced together with the reduction of the thermal power. In the process of decreasing the gas flow rates L and S, when the heating power by both burners 1 and 2 becomes near the middle fire, the electromagnetic valve 8 is closed by a command of the control means 9 according to the setting heating power in the operation unit 10 at this time. . As a result, the main burner 1 extinguishes fire, and the fuel gas is supplied only to the sub-burner 2 so that only the sub-burner 2 continues to burn. At this time, the solenoid valve 8 instantaneously closes the main burner connection path 6 so that the fuel gas flowing toward the main burner connection path 6 flows into the sub burner connection path 7. As a result, the thermal power increases instantaneously as the gas flow rate S to the sub-burner 2 increases, and an excessive decrease in thermal power immediately after the main burner 1 is extinguished is suppressed. As a result, it is possible to obtain an intermediate heating power that shifts from a medium heat to a low heat. When the set thermal power in the operation unit 10 is further changed to the low heat side, the gas amount adjusting valve 4 is actuated by an instruction from the control means 9, the gas flow rate S to the sub-burner 2 is reduced, and the thermal power is extremely low. A weak fire can be obtained.

  On the contrary, when the set fire power of the operation unit 10 is changed toward a strong fire from the state where the fire is obtained only by the combustion of the auxiliary burner 2, the gas amount adjusting valve 4 is actuated by the command of the control means 9. Then, the gas flow rate S to the sub-burner 2 is increased, and the thermal power is increased accordingly. Thereafter, when it becomes near the middle fire, the electromagnetic valve 8 is opened by a command of the control means 9 according to the set heating power of the operation unit 10. As a result, fuel gas is supplied to the main burner 1, and the main burner 1 is ignited by the flame of the sub-burner 2. At this time, when the solenoid valve 8 instantly opens the main burner connection path 6, a part of the fuel gas flowing toward the sub burner connection path 7 flows into the main burner connection path 6. Along with this, the heating power of the sub-burner 2 is instantaneously reduced, and an excessive increase in heating power immediately after the main burner 1 starts combustion is suppressed. As a result, it is possible to obtain an intermediate heating power that shifts from low heat to medium heat.

  Here, in order to reliably obtain good combustion when the electromagnetic valve 8 is opened and closed, the operation employed in the present embodiment will be described with reference to FIG. In the present embodiment, as an example, the gas amount adjusting valve 4 including the fixing plate 23 including the five through holes 29 is adopted, and a combination of the through holes 29 is selected to open a five-stage valve opening. Degrees A to E are formed.

  Also, each valve opening A to E corresponds to six stages of thermal power positions P1 to P6 indicating the magnitude of the set thermal power selected by the user in the operation unit 10, and the thermal power position P6 indicates the maximum thermal power (strong fire). The thermal power position P1 indicates the minimum thermal power (fire). More specifically, the relationship between the inputs corresponding to the valve openings A to E (corresponding to thermal power) and the thermal power positions P1 to P6 is set as shown in Table 1.

  In the present embodiment, as shown in FIG. 7, the solenoid valve 8 is opened and closed at an operating point V between the thermal power position P3 and the thermal power position P2, and the electromagnetic valve 8 is opened from the operating point V. The input of the auxiliary burner 2 is temporarily increased only for a predetermined time t (about 2 seconds in this embodiment) on the side.

  That is, as shown in Table 1 and FIG. 7, in the process of changing from the thermal power position P2 to the thermal power position P3 (the set thermal power is changed from the low fire side to the strong fire direction), immediately after opening the valve at the operating point V, the predetermined time t During this period, the gas amount adjusting valve 4 is maintained at the valve opening C. As a result, the input of the secondary burner 2 becomes 340 Kcal / h only for a predetermined time t, which is larger than the input 220 Kcal / h of the secondary burner 2 at the thermal power position P3. And after predetermined time t progresses, it is made to shift to valve opening D (opening corresponding to thermal power position P3) in the state where valve 8 was opened. By doing so, the input of the sub-burner 2 at the thermal power position P2 is changed from the state of 650 Kcal / h to the state of the sub-burner 2 at the thermal power position P3 of 220 Kcal / h. A state of 340 Kcal / h is intervened. This eliminates the influence of air or the like in which the fuel gas in the main burner connection path 6 is replaced when the solenoid valve 8 is closed, and the gas to the sub-burner 2 when the solenoid valve 8 is opened. Misfire due to excessive reduction of the flow rate can be prevented.

  On the other hand, in the process of changing from the thermal power position P3 to the thermal power position P2 (the set thermal power is changed from the high fire side to the low fire direction), the solenoid valve 8 is opened prior to the valve closing at the operating point V. In this state, the gas amount adjusting valve 4 is set to the valve opening C for a predetermined time t. As a result, the input of the auxiliary burner 2 is set to 340 Kcal / h, which is larger than the input 220 Kcal / h of the auxiliary burner 2 corresponding to the thermal power position P3. Then, after a predetermined time t has elapsed, the solenoid valve 8 is closed with the valve opening C set. By doing so, while the input of the secondary burner 2 at the thermal power position P3 is changed from 220 Kcal / h to the state of the secondary burner 2 at the thermal power position P2 being changed to 650 Kcal / h, the input of the secondary burner 2 is changed. Sufficient primary air flow in the secondary burner connecting pipe 7 of the secondary burner 2 is temporarily formed before the state of 340 Kcal / h is intervened and the input of the secondary burner 2 is changed from 220 Kcal / h to 650 Kcal / h. Therefore, it is possible to prevent the occurrence of yellow flame caused by the shortage of primary air and obtain good combustion.

  In the present embodiment, as shown in FIG. 5, the gas amount adjusting valve 4 mainly composed of the rotating plate 22, the fixed plate 23, and the orifice plate 24 is shown. The configuration of the valve 4 is not limited to this, and can be employed as the opening adjusting means of the present invention as long as the opening of the gas flow path 3 can be adjusted smoothly.

The block diagram which shows schematic structure of the stove burner of one Embodiment of this invention. Explanatory sectional drawing of a burner body. An explanatory plan view of a burner body. Explanatory drawing which shows the structure of a valve unit. The explanatory perspective view which decomposes | disassembles and shows the principal part structure of the gas quantity control valve in a valve unit. The diagram which shows the relationship between setting thermal power and gas flow rate. The diagram which shows the relationship between a thermal power position and a valve opening degree.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Main burner, 2 ... Sub burner, 3 ... Gas flow path, 4 ... Gas amount control valve, 6, 7 ... Burner connection path, 8 ... Solenoid valve, 9 ... Control means.

Claims (3)

In a stove burner comprising a main burner, a sub-burner adjacent to the main burner and having a maximum thermal power smaller than the main burner, and a gas flow path for supplying fuel gas to both burners,
A gas amount adjusting valve for adjusting a gas flow rate in the gas flow path;
A pair of burner connection paths branched from the downstream side of the gas amount control valve and connected to each burner;
A solenoid valve that opens when burning both burners and opens the burner connection path of the main burner, and closes and closes the burner connection path of the main burner when only the auxiliary burner is burned;
The stove burner characterized by providing the control means which controls the said gas quantity control valve and the said electromagnetic valve according to the setting thermal power set by the user. The control means opens the solenoid valve according to the change in the set thermal power, and the combustion state of only the auxiliary burner corresponding to the set thermal power before the change is changed to the combustion state by both burners corresponding to the set thermal power after the change. When the power of the sub-burner after changing the set power is smaller than before the set power,
The control means controls the gas amount adjusting valve so that the heating power of the sub-burner is smaller than before the set heating power is changed and is larger after the set heating power is changed for a predetermined time immediately after the solenoid valve is opened. The stove burner according to claim 1, characterized in that: The control means closes the solenoid valve according to the change of the set thermal power, and the combustion state of both burners corresponding to the set thermal power before the change is changed to the combustion state of only the sub-burner corresponding to the set thermal power after the change. When the heat power of the secondary burner after changing the set heat power becomes larger than before the set heat power change,
The control means controls the gas amount adjusting valve so that the heating power of the sub-burner is greater than before the set heating power change and less than after the set heating power change for a predetermined time immediately before the solenoid valve is closed. The stove burner according to claim 1 or 2, characterized by the above.

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