JP2007315684A - Hot plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain a uniform red heat state overall even when there is thermal deformation due to heating by a pipe burner, in a hot plate 1 comprised of an elongated metal plate with a substantially arced cross section opened downward, and laid above the horizontally long cylindrical pipe burner with multiple burner ports opened upward along a longitudinal direction, in parallel with the pipe burner with a predetermined interval in between. <P>SOLUTION: Crowning part of a predetermined area 11 including a center portion 10 in the longitudinal direction is raised higher than other areas 13, 13 while maintaining the same thickness. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot plate, in particular, a hot plate installed above a horizontally long pipe burner used in a pottery for grilling fish, meat, etc., and heated to a red hot state by combustion of the pipe burner.

  In the pottery as shown in FIG. 4, a plurality of cylindrical pipe burners (21) are installed in a casing (2) that opens upward, and are arranged in parallel in the horizontal direction. ), A hot plate (22) having a substantially arc-shaped cross section is disposed in parallel with the pipe burner (21) at a predetermined interval (see Patent Document 1).

  A front box (25) is projected on the front surface of the casing (2) .The front box (25) includes a fan for supplying primary air to the operation unit (23) and the pipe burner (21). An air supply device (24) and an ignition device such as a pilot burner are accommodated.

  The pipe burner (21) is a metal cylinder that opens forward and is flattened and closed at the rear end, and a number of flame holes (20) are formed at the top along the longitudinal direction. Has been. The rear end is screwed into the rear wall of the casing (2), and the front open end is externally connected to a nozzle (not shown) following the gas circuit in the front box (25). Has been.

  The heat plate (22) is formed in a semicircular arc shape by bending a heat-resistant band-shaped metal plate at the center line along the longitudinal direction, and the arc-shaped cross section is opened downward. Above the pipe burner (21), it is installed horizontally in the casing (2) so that the distance from the pipe burner (21) is uniform.

In this conventional apparatus, the ignition device is ignited and becomes in a combustion state, and simultaneously, a mixture of air and gas is discharged from each flame hole (20), and a flame from the pilot burner of the ignition device is ignited to the mixture. In the transferred state, it collides with the inner surface of the hot plate (22), so that a combustion flame is formed in a thin film on the inner surface. Since the pipe burner (21) and the inner surface of the hot plate (22) are arranged at a uniform distance, a combustion flame is uniformly formed on the entire inner surface of the hot plate (22) and at the same time. The hot plate (22) becomes red hot. As a result, it is placed on the grill or the like installed in the upper open part of the casing (2) by the combustion exhaust due to the combustion of the pipe burner (21) and the radiant heat from the hot plate (22) heated to a red hot state. Boiled fish and meat are baked.
In this case, the combustion flame is formed along the inner surface of the hot plate (22) having a semicircular cross section and does not overflow to the outside of the hot plate (22). In addition, the oil dripping from fish, meat, etc. is difficult to come into direct contact with the combustion flame, so the generation of smoke and soot is greatly reduced.
Japanese Patent Laid-Open No. 6-229519 JP 2000-146124 A

  However, since the conventional hot plate (22) as described above supports only both ends thereof at predetermined positions before and after the casing (2), when the hot plate is heated by the combustion flame and subsequently in a red hot state, As a result, the central portion hangs down. When the central portion of the hot plate (22) hangs down, the horizontal state cannot be maintained as a whole, and the distance between the pipe burner (21) and the hot plate (22) becomes uneven. As a result, the red heat state becomes non-uniform in the longitudinal direction of the hot plate (22), resulting in a disadvantage that the baking performance is impaired.

  As what can prevent distortion of the hot plate due to thermal deformation, both slopes of the hot plate having an inverted V-shaped cross section, such as those disclosed in Japanese Patent Application Laid-Open No. 2000-146124, are stepped. There is a configuration (see Patent Document 2). However, this method has a problem that it takes time to manufacture, and it is difficult to adopt it for a hot plate having an arc cross section, and oil from meat, fish, or the like tends to accumulate in the staircase portion.

  According to the present invention, a predetermined length is formed above a horizontally long cylindrical pipe burner which is formed of an elongated thin metal plate having a substantially arc-shaped cross section that opens downward, and a large number of flame holes open upward in the longitudinal direction. It is an object of the present invention to be able to maintain a uniform red hot state as a whole even if thermal deformation occurs due to heating by the pipe burner in the “hot plate installed in parallel with the pipe burner”.

(1) The hot plate of the invention according to claim 1 is “the top of a predetermined range including the central portion in the longitudinal direction is raised above the other ranges while maintaining the same thickness”. It is a feature.
The technical means operates as follows.
The heat plate is a belt-shaped elongated metal plate bent along a longitudinal center line with a substantially arc-shaped cross section, and includes a central portion in the longitudinal direction while maintaining the same thickness throughout. It is set as the structure which raised the top part of the range upwards compared with the other part. The pipe having the above-mentioned shape is supported in a posture in which the arc-shaped cross-section is opened downward, that is, in a posture in which a predetermined range including a central portion in the longitudinal direction is raised upward, and both ends in the longitudinal direction are supported at predetermined locations. Install in parallel above the burner. When the hot plate is heated to a red hot state by the combustion of the pipe burner, the central portion hangs down due to thermal deformation, but the top of the predetermined range including the central portion of the hot plate is raised upward in advance. Therefore, the protruding portion hangs downward, and as a result, the portion along the center line of the hot plate is maintained in a substantially horizontal state throughout the entire area. Thereby, the distance of a hot plate and a pipe burner is maintained uniformly over the whole area, and a uniform red hot state can be maintained.
When the hot plate is naturally cooled after use, the hot plate returns to a shape before deformation in which a predetermined range including the central portion is raised.

  (2) The heat plate of the invention according to claim 2 is the same as that of the invention according to claim 1, wherein the predetermined range including the central portion is raised by pressing the central portion from both sides. By pressing the longitudinal central portion of the elongated plate-like body having a circular arc-shaped section from both sides toward the central line, the central portion is reduced in the width direction and inevitably bulges upward. It will be. That is, since the central portion is raised upward by the amount of the narrow width, the volume of the space necessary for combustion between the pipe burner and the hot plate is kept uniform. Further, the resistance against thermal deformation is increased by reducing the width of the central portion.

  In addition, like the hot plate of the invention according to claim 3, it is preferable that “the central portion is raised by about 2 mm from the other ranges”, and the hot plate of the invention according to claim 4 As described above, in the case where “the predetermined range including the central portion is set to a length that is approximately one half of the entire length”, approximately one fourth of the entire length from both ends in the longitudinal direction. Only the range of the extent is the other range described in claim 1 having a normal arcuate cross section, and the predetermined range having a length of about one half of the entire length excluding this portion is The shape is gently raised.

  As described above, according to the first aspect of the present invention, even if the hot plate is heated to a red hot state by the combustion of the pipe burner and is thermally deformed in the direction in which the central portion hangs downward, the portion that has been raised in advance is Therefore, even when the hot plate is thermally deformed, the hot plate can maintain a substantially horizontal state. Therefore, at the time of heating, the distance between the hot plate and the pipe burner at the time of red heat can be kept uniform, and the hot plate can be made red hot uniformly. Moreover, since it returns to the original shape by natural cooling, the baking performance is not impaired even by long-term use.

  According to the invention which concerns on Claim 2, the predetermined range including the center part of a hot plate can be raised easily. In this case, the volume of the space necessary for combustion between the pipe burner and the hot plate can be kept uniform, so that the firing performance can be further improved and the deformation to the downward direction can be improved. Since the resistance increases, the strength of the hot plate against long-time heating in a red hot state increases, and the durable life becomes longer.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
The hot plate according to the embodiment of the present invention is used in a conventionally known pottery as shown in FIG. 4, and has a plurality of cylindrical pipe burners arranged in parallel in the casing (2). It is assumed that both ends are erected at a predetermined distance above each of (21).

1 is a plan view of the hot plate (1), FIG. 2 is a side view thereof, and FIG. 3 is a sectional view taken along line XX of FIG.
The hot plate (1) of the embodiment of the present invention is formed by bending a thin plate-like body made of special heat resistant stainless steel so that a part of a circle having a radius of 17 mm is formed along the center line in the longitudinal direction. It has a cross-sectional arc shape with a total length of 282 mm and a width of about 30 mm, and both sides along the longitudinal direction are folded inward to form a double structure.

  After forming a metal plate having an arc-shaped cross section as described above, the central portion (10) is pressed from both sides in the radial direction toward the center line, and the central portion (10) is half a radius of 12.5 mm. Form a circle. The central portion (10) has a length of 40 mm from the center in the longitudinal direction of the hot plate (1) to a total of 80 mm. By pressing this portion from both sides, as shown in FIG. The width of the predetermined range (11) on the left and right sides of the portion (10) is reduced, and the top of the hot plate (1) rises gently as shown in FIG. Thus, the predetermined range (11) of 150 mm in length functions as the raised portion (12).

  The raised portion (12) protrudes most upward in the range of the central portion (10), and the protruding height (h) of the central portion (10) with respect to the non-raised portion (13) on both sides of the predetermined range (11) is , About 2 mm. That is, when the hot plate (1) having the above-described configuration is horizontally installed in the casing of the ceramic ware in a downward open position with a predetermined distance above the horizontally supported rod-like pipe burner, as in the conventional case. In the central portion (10), the distance between the back surface of the hot plate (1) and the pipe burner is 2 mm away from the distance between the back surface of the non-raised portion (13) and the pipe burner.

  The pipe burner adopts a long and slender cylindrical shape with many flame holes open upward at the top along the longitudinal direction as shown in the conventional example, and accommodates a large number in parallel in the casing. Has been. An ignition device is provided below each pipe burner.

  Although not shown, the ignition device includes a pilot burner that ejects gas and an electrode that ignites the pilot burner. When the ignition device is ignited and a flame is ejected from the pilot burner, the flame is cylindrical. The space between the pipe burner and the hot plate (1) is reached via the outer periphery of the pipe burner. If the mixture of air and gas is discharged from the flame hole of the pipe burner before reaching this state, the flame from the pilot burner is transferred to the mixture and the pipe burner is in a combustion state.

  The air-fuel mixture discharged from the flame holes collides with the back surface of the hot plate (1), and a thin-film combustion flame is formed along the back surface. The hot plate (1) is heated to a red hot state by the combustion flame. When the heating in the red hot state continues, the hot plate (1) is thermally deformed, and in particular, it tends to be distorted in the direction in which it hangs down at the central portion that is not supported from below.

  However, in the hot plate (1) of the embodiment described above, both sides along the longitudinal direction are reinforced by folding in two, and the center portion (10) that is most easily thermally deformed is pressed from both sides to be wide. Is configured to be narrow, the strength against thermal deformation in the central portion (10) is set large. Furthermore, since the predetermined range (11) including the central portion (10) narrows the width of the central portion (10) and protrudes upward to form a raised portion (12), the pipe burner and the hot plate (1) In between, the intensity | strength with respect to deform | transforming below is improved, maintaining the volume required for combustion uniformly. Thereby, even if the hot plate (1) is thermally deformed, since the raised portion (12) that is raised upward in advance hangs downward and becomes a horizontal state, even in a thermally deformed state, The center line along the longitudinal direction of the hot plate (2) will maintain a horizontal state. Therefore, since a uniform red heat state can be maintained and it can withstand repeated use, the durable years are extended.

The top view of the hot platen of embodiment of this invention. The side view of the thermal plate of embodiment of this invention. XX sectional drawing of FIG. Explanatory drawing of the conventional hot platen.

Explanation of symbols

(1) ... Hot plate
(10) ・ ・ ・ ・ ・ ・ Center part
(12) ...

Claims (4)

It is made of a long and narrow metal plate having a substantially arc-shaped cross section that opens downward, and a plurality of flame holes open upward along the longitudinal direction at a predetermined interval above the pipe burner. In the hot plate installed in parallel with the pipe burner,
A hot plate characterized in that the top of a predetermined range including the central portion in the longitudinal direction is raised above the other range while maintaining the same thickness.   2. The hot plate according to claim 1, wherein the predetermined range including the central portion is raised by pressing the central portion from both sides.   3. The hot plate according to claim 1, wherein the central portion is raised by about 2 mm from the other range. 4.   The hot plate according to any one of claims 1 to 3, wherein the predetermined range including the central portion is set to a length of about one half of the entire length. .

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