JPH0155373B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in gas ovens.

[Prior art and its problems] When cooking using a gas oven, it is said that open flame is better. For baked goods such as bread that do not cause any problem even if the surface is hard, there is no problem even if hot air is forced to circulate inside the gas oven. However, confectionery products such as sponge cakes need to have a soft surface for product quality reasons, and there is a problem in circulating hot air inside the gas oven.

A gas oven that solved this problem was developed in 1983.
It is described in Publication No. 67223. This gas oven produces a mixed gas by mixing combustion gas and combustion air sent from a blower, and sends this mixed gas at low pressure to burners located at both the top and bottom of the gas oven. Burn it. The high-temperature gas generated by the combustion stays in the upper part of the firing chamber and becomes atmospheric heat, and this high-temperature gas descends onto the hot plate by natural convection and fires the object to be fired on the hot plate. Since this gas oven does not force hot air to circulate inside, it can also be used for confectionery products that require a soft surface, such as sponge cakes.

However, the above gas oven has the following problems. That is, the heat distribution inside the firing chamber is not uniform and is higher around the burner. Furthermore, when the door of the gas oven is opened, the high-temperature gas inside quickly flows out to the outside, causing the temperature in the baking room to drop rapidly. These factors cause uneven burns on the object to be fired.

[Object of the Invention] Therefore, an object of the present invention is to provide a gas oven that prevents uneven baking of objects to be baked.

[Structure of the Invention] The present invention produces a mixed gas by mixing combustion gas and combustion air sent from a blower, and supplies this mixed gas to burners disposed at both the upper and lower parts of a gas oven. The high-temperature gas generated by combustion is stored in the upper part of the firing chamber to become atmospheric heat, and this high-temperature gas is lowered by natural convection to the top of the hot plate to fire the object to be fired on the hot plate. In this gas oven, a required number of heat storage members are removably disposed in the upper part of the baking chamber.

The shape and number of heat storage members are arbitrary. The shape may be, for example, a round rod shape or a plate bent to have a cross section of "〓".

Effect By arranging the heat storage members appropriately, the heat distribution inside the firing chamber can be made substantially uniform. Also,
Even if high-temperature gas inside the gas oven rapidly flows out when the door of the gas oven is opened, the temperature inside the baking chamber does not drop suddenly due to the heat storage member. From these things, it is possible to prevent uneven burning of the object to be fired.

[Example] The present invention will be explained in more detail based on the example shown in the drawings. In FIGS. 1 and 2, the peripheral wall of the gas oven 1 is filled with a heat insulating material 15 such as asbestos. A burner temperature adjustment knob 41 is provided on the front. The inside of the gas oven 1 is divided into an upper chamber 1a and a lower chamber 1b by a hot plate 6, which will be explained later. The gas oven 1 has a door 2 at the front and an exhaust port 3 communicating with a rear exhaust passage 13 at the rear.
A top burner 5 is located slightly below the ceiling in the top chamber 1a.
is arranged. The upper burner 5 uses a hollow tube with a closed end, and on its upper surface there are two parallel rows of gas nozzles 55 extending diagonally upward along the longitudinal direction.
are arranged in a row. A fire transfer plate 56 is attached above the upper burner 5, and a heat diffusion plate 7 is provided below to diffuse the heat of the upper burner 5 into the upper chamber 1a, which is the firing chamber.
is arranged. A required number of small holes 71 are bored in the center of the heat diffusion plate 7 in order to uniformly apply the heat from the upper burner 5 to the object to be baked on the hot plate 6. A required number of heat storage rods 7, which are heat storage members, are located at approximately the same height as this heat diffusion plate 7 and on both sides of the heat diffusion plate 7.
5 are removably installed on the left and right side walls of the upper chamber 1a.

6 is a hot plate, on which objects to be baked such as confectionery, bread dough, pizza, fish, meat, etc. are placed and baked. A bottom burner 4 is arranged below the hot plate 6. Since the lower burner 4 has the same structure as the upper burner 5, a description of its construction will be omitted. A flame transfer plate 56 is attached to the upper part of the lower flame burner 4. A flat heat diffusion plate 70 for diffusing the heat of the lower burner 4 into the lower chamber 1b is disposed above it. A required number of small holes 711 are bored on both sides of the heat diffusion plate 70 to uniformly apply the heat of the lower burner 4 to the hot plate 6.
Asbestos 77 is pasted around the area to prevent resonance noise during combustion.

As shown in FIG. 2, the left and right side walls 90, 91
There are provided passages 8 and 9, which communicate the upper chamber 1a and the lower chamber 1b, with the hot plate 6 in between.
The side wall of the upper chamber 1a is provided with a required number of small holes 10 communicating with the passages 8 and 9, and the high-temperature gas after heating the hot plate 6 with the lower burner 4 passes through the passages 8 and 9. It is discharged from the small hole 10 into the upper chamber 1a.

A large number of exhaust holes 12 communicating with the rear exhaust passage 13 are bored in a portion of the back wall 121 slightly above the hot plate 6 over substantially the entire width thereof. The high-temperature gas generated by the firing of the upper burner 5 and lower burner 4 hits the object placed on the hot plate 6 and burns it, and then passes through the exhaust hole 12 and rear exhaust passage 13 to the gas oven from the exhaust port 3. 1 is discharged outside.

Reference numerals 111 and 112 are exhaust adjustment plates that open and close a part of the exhaust hole 12 to adjust the exhaust flow and prevent uneven burning.
A hole communicating with the exhaust hole 12 is bored. Also,
A long hole 113 is bored into the long hole 113, and a pin protruding from the back wall 121 is inserted into the long hole 113, so that the exhaust adjustment plates 111 and 112 are attached so as to be slidable left and right.

There is a rear exhaust passage 13 from the front to the ceiling of the upper chamber 1a.
An upper exhaust passage 100 in the form of a concave groove is provided. The upper exhaust passage 100 and the upper chamber 1a are provided with a ceiling plate 101.
It is separated by An upper exhaust port 102 is formed on the door 2 side of the ceiling plate 101, and a temperature adjustment hole 103 is formed on the back wall 121 side. This prevents the temperature inside the oven from rising too high. A damper 104 is disposed at the upper exhaust port 102, and this damper 104 is opened and closed by a connecting rod 105 whose tip projects toward the front. The damper 104 has the function of regulating the pressure inside the oven 1 and also has the function of discharging internal water vapor.

A mixed gas that does not require secondary air is sent to the upper burner 5 and the lower burner 4. The low-pressure mixer 22 shown in FIG. 3 uses a ventilly mechanism, and mixes gas by guiding it by jetting air. That is, a blower pipe 31 connected to the blower 23 shown in FIG. 4 is communicated with one end of the mixing chamber 311, and a gas pipe 32 provided with a gas discharge port 322 with a narrowed tip is communicated with a part of the mixing chamber 311. to draw gas into the mixing chamber 311 by a high-speed flow of air,
The mixed gas is fed into the upper burner 5 and the lower burner 4 from the sufficiently mixed rear gas pipe 331 using air jet pressure. Reference numeral 21 denotes a gas valve, which uses an electromagnetic valve, and adjusts the amount of combustion gas in accordance with the amount of air blown by the blower 23 to achieve an ideal combustion state. 58 is a flame detector (shown in FIG. 2).

Operation Adjust the temperature regulator 41 to the specified temperature, turn on the switch of the blower 23, and mix the combustion gas and combustion air sent from the blower 23 with the low-pressure mixer 22.
A mixed gas that does not require secondary air is produced by mixing the gas, and this mixed gas is sent to the upper burner 5 and the lower burner 4 at low pressure. Ignition device (not shown)
After sparking for 10 seconds, flame detector 5 goes off about 3 seconds later.
8 operates to hold the gas valve and continue combustion. The high-temperature gas generated by the combustion stays in the upper part of the upper chamber 1a and becomes atmospheric heat, and this high-temperature gas falls onto the hot plate 6 by natural convection and burns the object to be fired on the hot plate 6. .

If the object to be fired is unevenly baked, use the heat storage rod 7.
Increase or decrease the number of 5. In other words, the number of heat storage rods 75 is increased in areas with low temperature, and the number of heat storage rods 75 is decreased in areas with high temperature.
It evens out the firing heat inside and prevents uneven firing of the object to be fired. The high-temperature gas that is no longer useful for firing is discharged from the exhaust hole 12 through the rear exhaust passage 13 and from the exhaust port 3 to the outside of the gas oven 1.

[Effects of the Invention] According to the present invention, the required number of heat storage members are removably disposed in the upper part of the firing chamber, so the number of heat storage rods is increased in low temperature areas, and the number of heat storage rods is increased in high temperature areas. Not only can the firing heat in the firing chamber be adjusted by reducing the number of heat storage rods, but it can also prevent the temperature inside the firing chamber from dropping rapidly even if the high-temperature gas inside flows out when the door is opened. Therefore, uneven burning of the object to be fired can be prevented.

[Brief explanation of drawings]

Figure 1 is a partially cutaway side view of the gas oven, Figure 2
The figure is a partially cutaway front view of the gas oven, FIG. 3 is a sectional view of the low-pressure mixer, and FIG. 4 is a piping system diagram. 1: Gas oven, 4, 5: Gas burner, 6:
Heat plate, 75: heat storage rod.

Claims (1)

[Claims] 1. Combustion gas and combustion air sent from a blower are mixed to produce a mixed gas, and this mixed gas is fed to burners located at both the upper and lower parts of the gas oven at low pressure. The high-temperature gas generated by the combustion is retained in the upper part of the firing chamber to become atmospheric heat, and this high-temperature gas is lowered by natural convection to the hot plate to fire the object to be fired on the hot plate. A gas oven characterized in that a required number of heat storage members are removably disposed in the upper part of the baking chamber.