JP4171451B2 - grill - Google Patents

Description

  The present invention relates to a grill provided on a table stove or the like for heating an object to be cooked such as fish.

  In this type of grill, the food to be cooked is taken into and out of the grill cabinet through the grill door, and the cooked food is cooked by a grill burner provided in the grill cabinet with the grill door closed. The However, as the temperature in the grill chamber increases as the grill burner burns, the pressure in the grill chamber also increases. For this reason, the primary air is not smoothly supplied to the grill burner, and the grill burner cannot be burned efficiently.

  Therefore, conventionally, there is known a grill that prevents exhaustion of the inside of the grill chamber by forcibly exhausting the grill chamber and prevents an oxygen deficient state of the grill burner (Patent Document 1). The grill is provided with a fan that forcibly sends air to the exhaust passage, and a thermoelectric generator that drives the fan by thermoelectromotive force is provided in the grill cabinet.

However, when air is forcibly sent to the exhaust passage, the temperature rise in the grill can be suppressed, but the radiation amount of the grill burner may be reduced due to the temperature drop in the grill and the cooking time may be prolonged. . Further, even if air is forcibly sent to the exhaust passage, the temperature of the grill burner and its surroundings does not decrease, and the increase in the burner internal pressure cannot be suppressed, so there is a possibility that the primary air will not be supplied smoothly.
Japanese Patent Laid-Open No. 11-94265 (paragraph 0020 and FIG. 2)

  An object of the present invention is to provide a grill that can prevent the reduction of primary air and stably obtain the radiant heat of the grill burner by eliminating such disadvantages.

In order to achieve such an object, the present invention includes a grill burner for heating an object to be cooked in a grill cabinet, and an exhaust passage for leading the exhaust in the grill cabinet to the outside. The grill burner is a fuel gas injection nozzle. Bei give a formed in the upstream end portion venturi portion facing the gas introduction path for introducing a mixed gas of fuel gas and the primary air, the venturi section, is gradually enlarged to a negative pressure to the downstream side from the upstream side In a grill having a tapered portion, a thermoelectric generator provided at a predetermined position in at least one of the inside of the grill and the exhaust passage, and a primary air that is driven by an electromotive force of the thermoelectric generator and is supplied to the gas introduction passage of the grill burner And an air supply passage for sending primary air from the fan to the gas introduction passage, and the air supply passage is disposed at a predetermined interval on the inner peripheral surface of the tapered portion. The Toward the downstream side of the Nchuri portion, characterized in that it comprises a plurality of ejection ports to be opened.

  According to the present invention, the fan is driven by the electromotive force of the thermoelectric generator when the temperature of the inside of the grill and the exhaust passage rises due to combustion of the grill burner. As a result, the primary air is forcibly sent to the gas introduction path of the grill burner, so even if the internal pressure increases as the temperature rises, the primary air can be smoothly fed, and the grill burner is efficiently burned and stabilized. Radiant heat can be obtained. Since the thermoelectric generator is provided at a predetermined position (a position where it is easy to receive predetermined heat) in at least one of the inside of the grill and the exhaust passage, the electromotive force is surely generated by the heat at the time of combustion of the grill burner. Can do.

  Furthermore, since the fan is driven by the thermoelectromotive force generated by the thermoelectric generator, an external power source for driving the fan is not required, and the temperature in the grill chamber is sufficiently increased, and the internal pressure of the grill burner is reduced. Since the fan is automatically driven at a large time, a control circuit for controlling the driving time of the fan becomes unnecessary, the structure is simple, and the manufacturing cost can be reduced.

Also, without air supply path to inhibit the flow of primary air taken from between the injection nozzle and the venturi section, the electromotive force of the heat generating element temperature of the grill box to drive the fan sufficiently increase Until it occurs (for example, the early stage of combustion of the grill burner), sufficient primary air can be introduced from between the injection nozzle and the venturi section to obtain stable combustion of the grill burner.

At this time, the air supply path is provided with a plurality of outlets that are disposed on the inner peripheral surface of the tapered portion with a predetermined interval and open toward the downstream side of the venturi portion. The air in the air supply path is always directed into the gas introduction path due to the negative pressure associated with the flow of the fuel gas, and in particular, the temperature of the grill is sufficiently increased to generate an electromotive force of the thermoelectric generator that drives the fan. In the meantime (for example, the early stage of combustion of the grill burner), the backflow of air from the gas introduction path to the air supply path can be reliably prevented. In addition, the primary air ejected from the plurality of ejection openings of the tapered portion by driving the fan is drawn into the negative pressure accompanying the flow of the fuel gas ejected from the ejection nozzle and smoothly introduced into the gas introduction path. Gas and primary air can be mixed well.

  In the present invention, the grill burner includes a combustion section in which a number of flame holes are formed in a ceramic flat plate to perform surface combustion. When the combustion section is a so-called ceramic burner that performs surface combustion with a ceramic flat plate having a large number of flame holes, the distribution indoor pressure increases as the temperature rises due to the heat storage effect of the ceramic flat plate, so that the primary air is smooth. May not be able to be introduced. Also at this time, according to the present invention, when the temperature rises, sufficient primary air can be forcibly taken in by the fan, so that stable combustion can be obtained particularly suitably in the case of a ceramic burner.

  An embodiment of the present invention will be described with reference to the drawings. 1 is a cross-sectional explanatory view schematically showing the grill of the present embodiment, FIG. 2 is a cross-sectional explanatory view showing a gas introduction path of the grill burner, FIG. 3 is a cross-sectional explanatory view taken along the line III-III in FIG. And FIG.4 (b) is explanatory drawing which shows the attachment state of a thermoelectric generation element.

  As shown in FIG. 1, the grill 1 of this embodiment is provided in the table stove 2, and cooks the to-be-cooked objects 3, such as fish. The grill 1 includes a grill box 4 that accommodates an object to be cooked 3 therein, a grill burner 5 that is provided on the upper part of the grill box 4, and a grill 6 that places the object to be cooked 3 below the grill burner 5. I have. The grill 6 is placed on a tray 7, and the tray 7 is provided so that it can be pulled out from the front of the grill box 4. A grill door 8 that opens and closes the front of the grill 4 is provided at the front end of the tray 7. On the rear side of the grill box 4, an exhaust passage 9 for leading the combustion exhaust of the grill box 4 to the outside is provided.

  The grill burner 5 includes a combustion part 10 in which a number of flame holes are formed on a ceramic flat plate, and a mixed gas of primary air and fuel gas is supplied through a gas introduction path 11 so that surface combustion occurs in the combustion part 10. Is called. As schematically shown in FIG. 2, a venturi portion 12 is provided at the upstream end portion of the gas introduction path 11, and an injection provided at the tip of a gas pipe 13 for supplying fuel gas to the venturi portion 12. The nozzle 14 is facing. The venturi portion 12 includes a tapered portion 15 that gradually increases in diameter from the upstream side to the downstream side. The taper portion 15 increases the flow rate of the fuel gas injected from the injection nozzle 14 and draws primary air from the upstream end of the venturi portion 12 facing the injection nozzle 14 to the gas introduction path 11 due to the negative pressure associated therewith. It should be noted that the negative pressure that occurs most in the venturi portion 12 is a portion where the tapered portion 15 is formed, and is a region indicated by a symbol a in FIG.

  Further, as shown in FIG. 2, one end of an air supply pipe (air supply path) 16 is connected to the venturi section 12, and the other end of the air supply pipe 16 is connected via the air supply pipe 16. A fan 17 that forcibly sends primary air is connected to the gas introduction path 11 (venturi section 12). More specifically, the air supply pipe 16 is connected to an annular guide channel 18 provided on the outer periphery of the venturi portion 12. The guide channel 18 includes a plurality of jets 19 that open to the inside of the tapered portion 15. As shown in FIG. 3, each ejection port 19 is disposed on the inner peripheral surface of the tapered portion 15 at a predetermined interval, and opens toward the downstream side of the venturi portion 12. Thereby, the air ejected from each ejection port 19 goes downstream along with the flow direction of the fuel gas ejected from the ejection nozzle 14.

  The fan 17 is driven by the thermoelectromotive force of the thermoelectric generator 20 shown in FIG. As shown in FIG. 1, the thermoelectric generator 20 is attached to the bottom portion 22 on the grill box 4 side of the exhaust passage 9. As shown in FIG. 4A, the thermoelectric generator 20 is configured such that the thermal protection plate 24 of the thermoelectric generator 20 is exposed to the inside of the grill cabinet 4 through an attachment hole 23 that penetrates the bottom portion 22 of the exhaust passage 9. It is attached. The thermal protection plate 24 of the thermoelectric generator 20 is formed in a plate shape to protect the thermal surface of the thermoelectric generator 20. The thermal protection plate 24 also serves as a support member that is connected and supported to the bottom portion 22 of the exhaust passage 9 by screws 25, and the fixing member 26 that is in contact with the rear end of the thermoelectric generator 20, the thermal protection plate 24, and the like. Are connected to each other by a screw 25, so that the thermoelectric generator 20 is fixed to the bottom 22 of the exhaust passage 9.

  Further, as indicated by a virtual line in FIG. 1, another thermoelectric generator 21 may be attached to the top plate 27 at the upper front side of the grill cabinet 4. In this case, the fan 17 can be sufficiently driven only by the thermoelectric generator 20, but both the thermoelectric generator 20 and the other thermoelectric generator 21 may be provided. Only the element 20 or the other thermoelectric generation element 21 may be sufficient. When another thermoelectric generator 21 is provided, as shown in FIG. 4B, a heat-sensitive protective plate 29 of the other thermoelectric generator 21 is provided via an attachment hole 28 that penetrates the top plate 27 of the grill cabinet 4. It is attached so as to be exposed inside the grill cabinet 4. And since the heat-sensitive protective plate 29 of the other thermoelectric generator 21 also serves as a support member, the fixing member 30 and the heat-sensitive protective plate 29 that are in contact with the rear end of the other thermoelectric generator 21 are connected by screws 31. The other thermoelectric generators 21 are connected and fixed to the top plate 27 of the grill cabinet 4.

  It should be noted that the heat-sensitive surface may be exposed without providing the heat-sensitive protective plate 24 in the attached state of the thermoelectric generator 20. Similarly, in the other thermoelectric generator 21, the heat sensitive surface may be exposed without providing the heat sensitive protection plate 29. Further, a plurality of thermoelectric generators 20 may be provided on the bottom 22 of the exhaust passage 9, or a plurality of other thermoelectric generators 21 may be provided on the top plate 27 of the grill box 4.

  According to the grill 1 of the present embodiment having the above-described configuration, first, the grill burner 5 is ignited and the cooking of the cooking object 3 is started. In the early stage of combustion of the grill burner 5, the temperature inside the grill box 4 is relatively low, and the thermoelectric generator 20 (and / or other thermoelectric generator 21) does not perform thermoelectric generation, so the fan 17 is stopped. . As a result, at the initial stage of combustion of the grill burner 5, the ambient temperature of the grill burner 5 is also low, so that the increase in internal pressure is small, and an amount of primary air suitable for combustion flows smoothly between the venturi 12 and the combustion gas injection nozzle 14. Incorporated. At this time, the air supply pipe 16 connected to the gas introduction path 11 of the grill burner 5 is connected to the taper part 15 of the venturi part 12 in which a negative pressure is generated as the fuel gas flows, as shown in FIGS. The primary air jet 19 connected to the tapered portion 15 is opened in the direction along the flow of the fuel gas, so that, for example, the fuel gas can be reliably prevented from entering the air supply pipe 16. Is done.

  Thereafter, when the temperature inside the grill box 4 rises, the thermoelectric generator 20 (and / or another thermoelectric generator 21) starts thermoelectric generation, and the fan 17 starts the blowing operation by the thermoelectromotive force. When the temperature inside the grill 4 becomes relatively high and the ambient temperature of the grill burner 5 becomes high, the primary air becomes difficult to enter between the venturi 12 and the combustion gas injection nozzle 14 due to the influence of the internal pressure. In particular, in the case where the combustion unit 10 employed in this embodiment performs surface combustion of a ceramic flat plate, the temperature around the combustion unit 10 tends to be relatively high due to the heat storage action of the ceramic flat plate, and the natural air of the primary air Introduction is significantly inhibited. On the other hand, since the fan 17 is operated at this time and primary air is forcibly sent into the gas introduction path 11, good combustion is maintained even if the combustion portion 10 of the grill burner 5 performs surface combustion of a ceramic flat plate. Is done. As described above, the fan 17 forcibly sending the primary air to the gas introduction path 11 is provided, and the fan 17 is driven by the thermoelectromotive force of the thermoelectric generator 20 (and / or other thermoelectric generator 21). However, the fan 17 can be operated in accordance with a time when it becomes difficult to enter between the venturi portion 12 and the combustion gas injection nozzle 14. As a result, not only an external power source is unnecessary to drive the fan 17, but also the control circuit for controlling the fan 17 is unnecessary because the fan 17 operates according to the temperature rise inside the grill cabinet 4. Can do. Moreover, the primary air can be supplied without excess or deficiency from the initial stage of combustion of the grill burner 5 to a high temperature, and the radiant heat necessary for cooking can be stably obtained while maintaining a good fuel state of the grill burner 5. Can do.

  In the present embodiment, as the most preferable example, the grill burner 5 including the combustion unit 10 that performs surface combustion using a ceramic flat plate including a large number of flame holes has been described. However, the present invention is not limited thereto. For example, although not shown, even if a bunsen burner is used as another grill burner and the primary air is insufficient, the fan 17 is driven by the thermoelectromotive force generated by the thermoelectric generator 20 due to the temperature rise in the grill cabinet 4. Favorable combustion can be obtained by forcibly supplying primary air.

Cross-sectional explanatory drawing which shows typically the grill of one Embodiment of this invention. Cross-sectional explanatory drawing which shows the gas introduction path of a grill burner. III-III sectional view explanatory drawing of FIG. Explanatory drawing which shows the attachment state of a thermoelectric generation element.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Grill, 3 ... To-be-cooked object, 4 ... Grill storage, 5 ... Grill burner, 9 ... Exhaust path, 10 ... Combustion part, 11 ... Gas introduction path, 12 ... Venturi part, 14 ... Injection nozzle, 15 ... Taper part, 16 ... Air supply path, 17 ... Fan, 19 ... Spout, 20, 21 ... Thermoelectric generator, a ... Area where negative pressure occurs.

Claims (2)

A grill burner for heating an object to be cooked in the grill cabinet and an exhaust path for leading the exhaust in the grill cabinet to the outside. The grill burner has a venturi portion facing the fuel gas injection nozzle formed at the upstream end. e Bei gas introduction passage for introducing a mixed gas of fuel gas and the primary air, the venturi section, the grill comprising a tapered portion gradually enlarged to the negative pressure from the upstream side to the downstream side is caused,
A thermoelectric generator provided at a predetermined position in at least one of the inside of the grill and the exhaust passage, a fan driven by electromotive force of the thermoelectric generator and forcibly sending primary air to the gas introduction passage of the grill burner ; An air supply path for sending primary air from the fan to the gas introduction path,
The grille characterized in that the air supply path includes a plurality of jets that are disposed on the inner peripheral surface of the taper portion at a predetermined interval and open toward the downstream side of the venturi portion . The grill according to claim 1, wherein the grill burner includes a combustion portion that performs surface combustion with a plurality of flame holes formed in a ceramic flat plate .

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