JP4581360B2 - Natural convection oven - Google Patents

Description

  The present invention relates to a natural convection oven.

  Many of the conventional ovens are forced convection ovens that use an internal fan, which can be very effective in making the oven temperature uniform, but the surface of the fired product is easy to dry and not shiny. There are challenges. For this reason, natural convection ovens (for example, see Patent Document 1) that do not employ an internal fan are used for fired products that require a particularly glossy surface.

FIG. 6 shows a cross-sectional view of a conventional natural convection oven. In FIG. 6, an oven main body 4 having a heat insulating material 3 interposed between an outer case 1 made of stainless steel and an inner case 2 made of a ceramic material, and an openable / closable door main body 5 provided at the front opening thereof, It consists of an exhaust duct 6 arranged at the top,
The plate heater 12 is installed in the oven chamber, and the plate heater 13 is embedded in the upper surface, the lower surface, and the left and right side surfaces between the inner case 2 and the heat insulating material 3.

  The operation of the conventional natural convection oven configured as described above will be described below.

  A plate heater 12 that directly heats the tray 14 for placing the fired product in the cabinet, and a plate heater 13 embedded in the upper surface, the lower surface, and the left and right side surfaces between the inner case 2 and the heat insulating material 3, respectively. Can be heated directly and indirectly from the upper and lower and left and right side surfaces.

Further, the heat in the cabinet is exhausted to the outside through the exhaust duct 6 disposed at the top.
Registered Utility Model No. 3067327

  However, the conventional technique described above has a large heat effect due to the outside air from the door portion arranged on the front surface, and further heat is exhausted from the upper exhaust port, so natural convection occurs only in the upward direction, so the front of the interior There was a drawback that temperature equalization on the side and back side could not be performed sufficiently.

  This invention solves the conventional subject, and it aims at providing the natural convection type oven which can equalize | homogenize the temperature in a warehouse efficiently, without using a fan in a warehouse.

In order to solve the above-described conventional problems, the natural convection oven of the present invention includes an oven main body in which a heat insulating material is interposed between an outer case and an inner case, and an openable / closable door provided at the front opening of the oven main body. It consists of a main body, an upper fire heater is provided on the ceiling surface of the inner case, a lower fire heater is provided in the lower fire heater cover on the bottom surface, and an opening hole is provided at the door side front end of the lower fire heater cover It is a natural convection oven characterized by that.

As a result, the opening hole of the lower fire heater cover is provided at a position facing the front opening of the oven body, so that heat convection near the door occurs and is affected by heat absorption from the door. It becomes difficult, and it has the effect | action that the temperature inside a warehouse can be aimed at.

  The oven of the present invention is a natural convection oven characterized in that a valve disposed in the exhaust duct is formed of a shape memory alloy.

  As a result, when the temperature is lower than a predetermined temperature, the exhaust duct is closed to promote the temperature rise in the cabinet, and when the temperature is higher than the predetermined temperature, the exhaust duct is released to promote convection in the equipment cabinet and Soaking can be achieved.

  The natural convection oven of the present invention can efficiently exhaust the heat of the lower heater to the front surface of the chamber, and can make the temperature inside the chamber uniform by natural convection to the back side.

The invention according to claim 1 includes an oven main body in which a heat insulating material is interposed between the outer case and the inner case, and an openable / closable door main body provided at the front opening thereof, and the ceiling of the inner case An upper fire heater is provided on the surface, a lower fire heater is disposed in the lower fire heater cover on the bottom surface, and an opening hole is provided in the door side front end of the lower fire heater cover. Since the opening hole is provided at a position facing the front opening of the oven main body, it is hardly affected by the heat from the outside air from the door, and the temperature inside the cabinet can be equalized.

According to a second aspect of the present invention, in the first aspect of the invention , the opening hole is provided on a surface facing the door at the front end of the lower heater cover, thereby improving the cleanability of the interior. Can do.

  The invention according to claim 3 is a natural convection oven according to claim 1 or 2, wherein the front side of the support holding the lower heater is opened, thereby further increasing the heat of the heater. Heat can be efficiently exhausted to the front side of the cabinet.

  According to a fourth aspect of the present invention, in the natural convection oven according to any one of the first to third aspects of the present invention, an exhaust duct is provided on the back surface of the oven main body, so that the heat from the heater is supplied to the oven main body. Natural convection from the front side to the back side can be caused, and the temperature inside the oven can be equalized.

  The invention according to claim 5 is the natural convection oven of the invention according to claim 4, wherein the valve disposed in the exhaust duct is formed of a shape memory alloy, so that the inside of the chamber has a predetermined temperature or less. In this case, the exhaust duct is closed to promote the temperature rise in the cabinet, and when the temperature is higher than a predetermined temperature, the exhaust duct is released to promote convection in the equipment cabinet and to equalize the temperature.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a natural convection oven according to a first embodiment of the present invention. FIG. 2 is a perspective view of a lower heater cover and a heater mounting portion of the natural convection oven according to the first embodiment of the present invention.

In FIG. 1, an oven main body 4 having a heat insulating material 3 interposed between an outer case 1 and an inner case 2, an openable / closable door main body 5 provided at the front opening thereof, and an exhaust duct provided at the rear portion. 6, a lower fire heater 9 is disposed outside the upper fire heater 7 and the lower fire heater cover 8 on the outside of the ceiling plate of the inner case 2, and the front and upper front portions of the lower fire heater cover 8 are disposed. A front opening 8a and a front upper opening 8b are provided. In FIG. 2, the support 10 that holds the lower fire heater 9 holds the heater so as to open the front side of the oven.

In the oven configured as described above, the front opening hole 8a and the front upper surface opening hole 8b of the lower fire heater cover 8 are provided at positions facing the front opening of the oven body 4, and the lower fire heater 9 is held. Since the oven front side is also opened in the supporting tool 10, the natural air convection from the front side of the oven to the back side is generated by the exhaust duct 6 provided on the back side because it is not easily affected by the outside air from the door. The temperature in the storage can be kept uniform.

(Embodiment 2)
FIG. 3 is a perspective view of the lower flame heater cover and the heater mounting portion of the natural convection oven in the second embodiment of the present invention. In the present embodiment, the front opening hole 8a is provided in the front portion of the lower fire heater cover 8, and the support 10 that holds the lower fire heater 9 holds the heater so as to open the front side of the oven. The exhaust duct 6 provided on the back surface is not easily affected by the outside air from the door, and natural convection from the front side to the back side of the oven occurs, so that the temperature in the cabinet can be kept uniform. In addition, it is possible to prevent the foreign matter such as bread crumbs from falling into the bottom heater cover when cleaning the inside of the cabinet, and improve the cleanability of the inside of the cabinet.

(Embodiment 3)
FIG. 4 is a cross-sectional view of the exhaust duct when the temperature in the natural convection oven in the third embodiment of the present invention is equal to or lower than a predetermined temperature. FIG. 5 is a cross-sectional view of the exhaust duct when the internal temperature of the natural convection oven in the third embodiment of the present invention is equal to or higher than a predetermined temperature. In the present embodiment, since the valve 11 disposed in the exhaust duct 6 is formed of a shape memory alloy, the exhaust duct 6 is closed to increase the temperature in the storage when the interior is below a predetermined temperature. When the temperature reaches a predetermined temperature or more, the exhaust duct 6 is released to promote the convection in the warehouse, so that the temperature inside the warehouse can be efficiently maintained even if the user does not operate the opening and closing of the exhaust duct 6. Can be planned.

  In this embodiment, the exhaust air passage is secured by bending the valve, but the entire valve may be opened and closed.

  As described above, the natural convection oven according to the present invention efficiently exhausts the heat of the lower heater to the front surface of the chamber, and efficiently equalizes the temperature in the chamber by natural convection to the back side. Therefore, it can be applied to the baking of breads that require a particularly glossy surface, and baking of various doughs such as Western confectionery such as sponges.

Sectional drawing of the natural convection type oven in Embodiment 1 of this invention The perspective view of the lower-fire heater cover and heater attachment part of the natural convection-type oven in Embodiment 1 of this invention The perspective view of the lower-fire heater cover and heater attachment part of the natural convection type oven in the 2nd Embodiment of this invention Sectional drawing of an exhaust duct in case the chamber internal temperature of the natural convection type oven in the 3rd Embodiment of this invention is below predetermined temperature Sectional drawing of the exhaust duct in case the internal temperature of the natural convection type oven in the 3rd Embodiment of this invention is more than predetermined temperature Cross section of conventional natural convection oven

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer case 2 Inner case 3 Heat insulation material 4 Oven body 5 Door 6 Exhaust duct 7 Upper fire heater 8 Lower fire heater cover 9 Lower fire heater 10 Support

Claims (5)

It consists of an oven main body with an insulating material interposed between the outer case and the inner case, and an openable / closable door main body provided at the front opening thereof, and an upper fire heater is provided on the ceiling surface of the inner case. A natural convection oven characterized in that a lower fire heater is disposed in the lower fire heater cover, and an opening hole is provided in the door side front end of the lower fire heater cover. The natural convection oven according to claim 1, wherein the opening hole is provided on a surface facing the door at the front end portion of the lower fire heater cover.   The natural convection oven according to claim 1 or 2, wherein the support for holding the lower heater is configured to open a side facing the door.   The exhaust duct is provided in the back surface of the oven body, and the heat from the heater causes natural convection from the front surface to the back surface of the oven body so as to equalize the temperature in the oven cabinet. The natural convection oven according to claim 1.   A valve arranged in the exhaust duct is formed of a shape memory alloy. When the temperature is lower than a predetermined temperature, the exhaust duct is closed to promote a temperature rise in the equipment cabinet. When the temperature is higher than the predetermined temperature, the exhaust duct is released. 5. The natural convection oven according to claim 4, wherein the convection in the equipment cabinet is promoted and the temperature is equalized.

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