JPS5812502B2 - Chiyouriki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recovering exhaust heat from cooking appliances such as gas stoves and gas ovens, and its structure.

FIG. 1 is a schematic diagram of a gas stove as an example of a conventional cooking device.

The gas table main body 1 is provided with a stove burner 2 and a grill burner 3. A saucer 8 is provided at the bottom of the grill burner 3, and a food to be cooked 10 is placed on a tray 9 attached to the saucer 8. .

A wire mesh 1 is provided above the grill burner 3, and the wire mesh 7 is heated to red by the flame coming out of the grill burner 3, and the food 10 on top of the grill 9 is heated by the radiant heat from the wire mesh 7. be done.

As described above, in the conventional structure, not all of the heat from the heating source is effectively used to heat the food to be cooked, but escapes to the outside, and the entire surface of the food to be cooked is not evenly heated.

Furthermore, the exhaust gas from the burner is discharged into the atmosphere while still at a high temperature, which is very uneconomical from the standpoint of energy conservation.

The purpose of the present invention is to effectively utilize the heat from the heating source to heat the food to be cooked, and also to recover and effectively utilize the heat possessed by high exhaust gases.

An embodiment of a gas stove as an example of the cooking device of the present invention will be described below with reference to FIGS. 2 to 4.

Figure 2 is a detailed view of the grill part of the gas stove, Figure 3 is an enlarged view of the saucer part in Figure 2, and Figure 4 is A in Figure 3.
-A' line arrow sectional view.

The airtight container 20 constituting the heat transfer device has a porous material 21 (e.g., wire mesh, sintered metal, metal fiber, glass wool, etc.) impregnated with an appropriate evaporative liquid (e.g., water, alcohol, Freon, etc.). is lined.

The airtight container 20 is arranged such that one end (heat receiving part) is located above the wire mesh 1 and the other end (heat radiating part) is located in a part of the air introduction pipe 24 for the combustion air introduced into the grill burner 3. It is removably installed.

As a result, the closed container 20 utilizes the heat of the exhaust gas to preheat the combustion air through a phase change (evaporation and condensation) of the evaporative liquid contained therein.

Similarly to the sealed container 20, the sealed container 20' constituting another heat transfer device has a porous material 21 (for example, a wire mesh, sintered metal, metal fiber, glass wool, etc.).

The heat radiating part of this airtight container 20' is located near the lower part (the surface opposite to the heating source surface) of the food to be cooked 10 placed on the dish 9, and the heat receiving part absorbs the heat from the heating source. It is removably installed on the body 9 so as to be located in the part that is directly received (the part where the food to be cooked 10 is not placed).

As a result, the airtight container 20' converts the heat radiated from the red-hot wire mesh 7, which escapes to the outside, into heating the food by the phase change (evaporation and condensation) of the evaporative liquid contained therein. used for.

Next, the heat transfer path will be explained in more detail.

First, the heat possessed by the exhaust gas is transmitted to the fins 23 attached to the closed container 20 above the wire mesh 7, and this heat is transmitted to the porous material 21 inside through the wall of the closed container.

Since the porous material 21 is impregnated with an evaporative liquid, the evaporative liquid receives this heat and evaporates.

The evaporated steam passes through a steam passage section 27 surrounded by a porous material 21.
moves toward the other end (the inner wall of the closed container provided in a part of the air introduction pipe 24) due to the vapor pressure difference, and releases the latent heat of condensation in the porous material 21 at the other end of the closed container, becoming a liquid.

The heat released at this time passes through the closed container 20 and is transferred to the air sucked in from the air introduction pipe 24 via the fins 22.

On the other hand, the liquid condensed in the porous material 21 is pulled back again by the capillary force of the porous material 21, and the same cycle as before is repeated.

Preheating the air and gas by recovering exhaust heat in this way increases the temperature of the flame burning in the grill burner 3, so conversely, the temperature of this flame can be kept the same as when the heat of exhaust gas is not recovered. If this is the case, the amount of gas to be introduced will be small, and therefore fuel can be saved.

Furthermore, since the airtight container is installed in a removable manner, replacement and repair can be easily performed.

On the other hand, not all of the heat radiated from the red-hot wire gauze 7 is used to heat the cooking utensil 10, and some of the heat radiates from the sides of the saucer 8 and the part 9 where the cooking item 10 is not placed. I run away to the side.

This heat is transferred to the airtight container 20' located in the 9th part of my body.
The heat is transmitted to the heat-receiving part where the food to be cooked 10 is not placed.

This heat passes through the wall of the closed container 20' and the porous material 2 inside.
It is transmitted to 1'.

Since the porous material 21' is impregnated with an evaporative liquid, the evaporative liquid receives this heat and evaporates.

This evaporated steam moves through the steam passage section 27 surrounded by the porous material 21' due to the steam pressure difference toward the lower part of the food to be cooked 10, which is the heat dissipation section of the closed container 20'. Porous material 21' lined on the inner wall of the section
It releases the latent heat of condensation and becomes a liquid.

The heat released at this time passes through the wall of the closed container 20' and is then transmitted to the lower side of the article to be adjusted 10 in the vicinity of this release part, heating this part at the same time.

On the other hand, the condensed liquid is returned to the heat receiving part of the closed container 20' by the capillary force of the porous material 21', and the same cycle as before is repeated.

In this way, among the heat from the heating source, the heat that escapes to the outside without heating the to-be-cooked item 10 is recovered and simultaneously heats the lower side of the to-be-cooked item 10, so that the to-be-cooked item 10 can be heated evenly. It can be heated in various ways and cooking time can be shortened.

In addition, since the airtight container is removably installed,
Replacement and repairs can be easily performed.

In addition, in this example, the airtight container 20' contains the food to be cooked 10.
Although the closed container 20' is removably installed on the body 9 on which the body is placed, the closed container 20' can also be used as the body.

FIG. 5 shows a modified example of a gas stove as an example of the cooking product of the present invention, which stores the heat of exhaust gas in water and uses it as hot water.

That is, a trivet 34 is provided on the top of the wire mesh 7, and a jar 30 having a double wall structure is placed on top of the trivet 34.

Inside the double walls of the jar 30, an evaporative liquid 31 (e.g., water, Freon, alcohol, etc.) is present.
The heat of the exhaust gas is transferred to the water 32 contained within the inner wall of the jar 30 by utilizing the evaporation and condensation of this evaporative liquid 31.

If the amount of liquid 31 contained in the double wall is set so that the liquid level does not come into contact with the inner wall surface, the heat held by the water 32 will be released to the outside when the grill burner 3 is not in use. It is possible to reduce the number of escapes.

Thereby, even if the grill burner 3 is used intermittently, it is possible to effectively store the heat of the exhaust gas in the water 32.

FIG. 6 shows a gas oven as an example of the cooking device of the present invention.

The gas combusted by the burner 3 of the oven imparts heat to the inner box 40 while passing between the inner box 40 and the outer box 41, but this heat is transferred onto the tray 8 inside the inner box 40 by radiation. The heat is transmitted to a certain to-be-cooked item 10 and heats the to-be-cooked item 10.

The exhaust gas that has passed between the inner box 40 and the outer box 41 escapes to the outside from the gas exhaust hole 42, but since the temperature of this exhaust gas is quite high, the gas shown in FIGS. 2 to 4 The heat contained in the exhaust gas is applied to the combustion air and the gas injected into it to save fuel by using a method similar to that described in the table.

Note that 44 is a heat insulating material, which reduces heat escaping from the outer box 44 to the outside air.

FIG. 7 shows a modified example of a gas oven as an example of the cooking device of the present invention.

This is a porous material 21. impregnated with an evaporable liquid. Two airtight containers 20 and 20' are used, one airtight container 20 is used for heating the food to be cooked 10 in the oven, and the other airtight container 20' is also used for heat recovery of exhaust gas. I am using it as.

In this case, an evaporative liquid 31 (for example, water, Freon, alcohol, etc.) is contained in the inner box 40 and the outer box 41, and as a result of the evaporation and condensation of the evaporative liquid 31, the inner wall of the inner box 40 forms a sealed container 20. The heat of the combustion gas is transferred through the

The heat transferred to the inner box 40 is radiated to the food to be cooked 1.
0 can be communicated.

The advantage of this method is that the inner box 40 and the outer box 41 are less likely to corrode than the method of passing combustion gas between the inner box 40 and the outer box 41 as shown in FIG.

Instead, the closed container 20' and the fins 23' attached to it are corroded because they are in direct contact with the combustion gas.
The mounting structure may be such that it is easy to remove the closed container 20' and replace it.

Another feature is that the inner wall of the inner box 40 is uniformly heated by the evaporation and condensation of the evaporative liquid 31, so that the food to be cooked 10
It is heated evenly and evenly.

As explained above, according to the present invention, the heat from the heating source can be effectively used to heat the food to be cooked, and furthermore, the heat held in the exhaust gas can be recovered and used effectively. can.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a gas stove as an example of a conventional cooking device, and FIG. The figure shows a grill section in an embodiment of a gas table as an example of the cooking device of the present invention, FIG. 3 is an enlarged view of the saucer section in FIG. 2, and FIG. 4 is a line A-A' in FIG. 3. A cross-sectional view taken in the direction of the arrows, FIG. 5 is a diagram showing a modification of a gas stove as an example of the cooking device of the present invention, and FIGS. 6 and 7 are diagrams showing a modification of the gas stove as an example of the cooking device of the invention. It is a diagram. 3...Grill burner, 8...Saucer, 9...Me, 10...Item to be cooked,
20,20'... airtight container, 21,21'...
... Porous material, 24 ... Air introduction pipe,
27... Steam passage section.

Claims (1)

[Claims] 1. In a cooking device that heats the food in a saucer using heat generated from a heating source, an evaporative liquid is sealed inside a sealed container in the saucer, and the evaporative liquid is heated by using the evaporation and condensation action of the evaporative liquid. A heat transfer device that transfers heat from a heat receiving part to a heat radiating part is provided, and in this case, the heat radiating part of the heat transfer device is connected to a surface of the food to be cooked on a saucer that is opposite to a surface that directly receives heat from the heat source. A cooking appliance characterized in that the heat receiving part is located nearby so as to directly receive heat from the heating source.