JP5999780B2 - grill - Google Patents

Description

  The present invention relates to a grill incorporated in a stove body.

  Conventionally, this type of grill includes a grill cabinet and a grill burner disposed on the ceiling of the grill cabinet, and also includes a heat shield that covers the grill burner from above in order to prevent temperature rise inside the stove. In addition, the grill burner includes a flat box-shaped sheet metal burner body having an open bottom surface, and a combustion plate having a number of flame holes fixed to the burner body so as to cover the bottom surface of the burner body. Conventionally, a sheet metal grill burner that uses a sheet metal instead of a commonly used ceramic plate as a combustion plate to reduce costs is also known.

  Here, in the grill burner made of sheet metal as described above, a large resonance noise may be generated in 3 to 4 minutes from the start of combustion to the steady combustion state. That is, immediately after the start of combustion, the temperature of the burner itself is lower than in the steady combustion state, so the heat of the combustion flame is taken away by the combustion plate, and the balance between the combustion speed in the flame hole and the gas ejection speed is lost. The combustion state becomes unstable, and the combustion flame causes vibration combustion in which the vibration flame periodically oscillates, and the vibration frequency of the vibration combustion coincides with the natural frequency of the burner body to generate a resonance sound.

  Therefore, conventionally, Patent Document 1 discloses a sheet metal grill burner in which aperture ribs that rise upward are formed in a lattice shape on the upper plate portion of the burner body. According to this, the rigidity of the burner body is enhanced, the natural frequency of the burner body becomes higher than the vibration combustion frequency, and the generation of resonance noise can be prevented.

  However, in this case, when the heat shield plate hangs down after long-term use, the heat shield plate comes into contact with the lattice-shaped throttle ribs, and the heat shield effect due to the gap between the upper plate portion and the heat shield plate is obtained. The temperature inside the stove rises due to heat dissipation through the heat shield.

JP 2011-7442 A

  In view of the above points, an object of the present invention is to provide a grill capable of preventing the generation of resonance noise and preventing temperature rise inside the stove.

In order to solve the above-mentioned problem, the present invention is a grill incorporated in a stove body , and includes a grill cabinet, a grill burner disposed on a ceiling portion of the grill cabinet, and a heat shield that covers the grill burner from above. The grill burner comprises a flat box-shaped sheet metal burner body with an open lower surface, and a sheet metal combustion plate having a number of flame holes fixed to the burner body so as to cover the lower surface of the burner body. the upper plate portion of the burner body is composed of a hip-shaped or molded plate aperture to rise in pyramidal upward characterized Rukoto.

  According to the present invention, the rigidity of the burner main body is enhanced as compared with the case where the upper plate portion of the burner main body is flattened, and the natural frequency of the burner main body is higher than the vibration combustion frequency (combustion frequency). Therefore, the generation of resonance sound is prevented. Furthermore, even if the heat shield plate hangs down due to long-term use, the heat shield plate only comes into contact with the top of the upper plate of the burner body, and the heat shield between the portions other than the top of the upper plate and the heat shield plate. Sufficient air gap is secured for preventing the temperature inside the stove from rising.

  Further, in the present invention, it is desirable to provide the heat shield plate with a recessed portion that is recessed downward to contact the top of the upper plate portion of the burner body. According to this, a kind of reinforcement effect is obtained by the contact of the recess with the burner body, and the natural frequency of the burner body is further increased. For this reason, even if the combustion frequency becomes high due to clogging of the flame holes, the natural frequency of the burner body becomes higher than the combustion frequency, and the generation of resonance noise is prevented.

The perspective view of the grill of the embodiment of the present invention. Sectional drawing of the grill | grill cut | disconnected by the II-II line | wire of FIG. The perspective view of the grill burner which the grill of an embodiment comprises.

  Referring to FIGS. 1 and 2, reference numeral 1 denotes a grill according to an embodiment of the present invention incorporated in a stove body not shown. The grill 1 includes a grill cabinet 2 having a grill door 21 that can be opened and closed on the front surface, a grill burner 3 disposed on a ceiling portion 22 of the grill cabinet 2, and a heat shield plate 4 that covers the grill burner 3 from above.

  A grill pan 23 connected to the grill door 21 and a grill 24 on the grill pan 23 are stored in the grill cabinet 2, and the food to be cooked placed on the grill 24 is burned by the grill burner 3. Baked. The combustion exhaust gas from the grill burner 3 is guided to the exhaust port 26 at the rear end of the ceiling portion 22 through a flue 25 defined in the upper rear part of the grill warehouse 2. Further, a temperature sensor 27 is disposed in the flue 25, and the grill burner 3 is extinguished when the temperature detected by the temperature sensor 27 rises abnormally due to internal combustion or the like.

  The heat shield plate 4 is disposed on the ceiling portion 22 so as to straddle the rising portion 22a at the front end of the ceiling portion 22 of the grill cabinet 2 and the front portion of the exhaust port 26 of the ceiling portion 22.

  Referring also to FIG. 3, the grill burner 3 includes a flat box-shaped burner body 31 having an open lower surface and a number of flame holes (not shown) fixed to the burner body 31 so as to cover the lower surface of the burner body 31. A combustion plate 32 made of sheet metal, and a mixing tube 33 connected to one side of the burner body 31 in the lateral direction. And the grill burner 3 is arrange | positioned in the ceiling part 22 in the state which made the combustion plate 32 face the opening 22b for burners opened in the ceiling part 22 of the grill warehouse 2. As shown in FIG. On the other lateral side of the grill burner 3, an ignition electrode 34 and a thermocouple 35 are attached with their tips facing the lower side of the combustion plate 32.

  The combustion plate 32 has a flange portion 32a projecting around the main portion facing the burner opening 22b. The burner body 31 is also provided with a similar flange portion 31a, and a flange is formed on the lower surface of the flange portion 31a. The combustion plate 32 is fixed to the burner body 31 by hemming the outer edge portion of the flange portion 31a in a state in which the portion 32a is abutted. The mixing tube 33 is formed by vertically superposing an upper half part integral with the burner body 31 and a lower half part integral with the combustion plate 32.

  By the way, when the rigidity of the burner body 31 is low, the natural frequency of the burner body 31 coincides with the above-described vibration combustion frequency (combustion frequency), and a resonance sound is generated. Therefore, in the present embodiment, the upper plate portion 31b of the burner main body 31 is drawn so as to rise upward in a dormitory shape. According to this, the rigidity of the burner body 31 is increased as compared with the case where the upper plate portion 31b of the burner body 31 is made flat, and the natural frequency of the burner body 31 becomes higher than the combustion frequency, so that the resonance sound Is prevented from occurring.

  Further, in the present embodiment, the heat shield plate 4 is provided with a recessed portion 41 that is recessed downward and comes into contact with the top portion 31c of the upper plate portion 31b of the burner body 31. According to this, a kind of reinforcement effect is obtained by the contact of the recess 41 with the burner body 31, and the natural frequency of the burner body 31 is further increased. Therefore, even if the combustion frequency becomes high due to clogging of the flame holes, the natural frequency of the burner body 31 becomes higher than the combustion frequency, and the generation of resonance noise is prevented.

  Moreover, in this embodiment, even if the heat shield plate 4 hangs down due to long-term use, the heat shield plate 4 does not come into contact with portions other than the top portion 31c of the upper plate portion 31b. Therefore, a sufficient space for heat shielding is ensured between the portion other than the top 31c of the upper plate portion 31b and the heat shield plate 4, and the temperature inside the stove can be prevented from rising.

  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-described embodiment, the upper plate portion 31b of the burner body 31 is drawn so as to swell upward, but the upper plate portion 31b is drawn so as to swell upward like a quadrangular pyramid. Also good.

  DESCRIPTION OF SYMBOLS 1 ... Grill, 2 ... Grill warehouse, 22 ... Ceiling part, 3 ... Grill burner, 31 ... Burner main body, 31b ... Upper board part, 31c ... Top part, 32 ... Combustion board, 4 ... Heat shield board, 41 ... Recessed part.

Claims (2)

A grill incorporated in a stove body, comprising a grill cabinet, a grill burner disposed on the ceiling of the grill cabinet, and a heat shield that covers the grill burner from above, and the grill burner is a flat box shape with an open bottom surface. In a sheet metal burner body and a sheet metal combustion plate having a number of flame holes fixed to the burner body so as to cover the lower surface of the burner body,
The upper plate portion of the burner body, grille, characterized in Rukoto consists of hip-shaped or molded plate aperture to rise in quadrangular pyramid upwards. The grill according to claim 1, wherein the heat shield plate is provided with a recessed portion that is recessed downward to contact the top of the upper plate portion of the burner body.

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