JP7503296B2 - Cooking equipment - Google Patents

Description

The present invention relates to a cooking device that enables so-called hybrid heating, in which the bottom of a cooking container is heated at high temperature and the sides are heated with steam.

Conventionally, this type of commercial cooking device includes, for example, a cooking container into which ingredients are put and cooked, and a gas heating device for heating the bottom of the cooking container. When stir-frying vegetables in such a cooking device, for example, the large amount of vegetables put into the cooking container undergoes the following process.

That is, a large amount of vegetables is initially placed in a large commercial cooking vessel, filling it all the way to the top, and then the bottom of the vessel is heated to a high temperature by a gas heating device. As the stir-frying process progresses, the vegetables that were initially filled all the way to the top of the vessel begin to concentrate toward the bottom of the vessel, and finally the stir-frying process is completed by high-temperature heating at the bottom.

However, when stir-frying using only high-temperature heating from the gas heating device at the bottom, it takes a considerable amount of time for a large amount of vegetables to gather at the bottom of the cooking container, which causes the cooking time to become significantly longer. If the heating temperature is further increased to shorten this time, the vegetables that are in the process of gathering tend to burn on the inside surface of the cooking container.

Therefore, the applicant proposed a cooking device in Patent Documents 1 and 2 that enables so-called hybrid heating, in which the bottom of the cooking container is heated with high-temperature gas and the sides with high-calorie steam.

This cooking device heats a cooking vessel containing ingredients at different positions using a steam heat source and a gas heat source. The bottom heating device for the gas heat source heats the bottom of the cooking vessel, and the steam heat source heats the cooking vessel by supplying steam to a heat exchange jacket on the side of the cooking vessel.

Therefore, the vegetables that are filled to the top of the cooking container at the beginning of heating can be heated from the sides with steam and quickly concentrated at the bottom of the cooking container. Finally, the stir-frying can be completed in a short time by high-temperature heating at the bottom.

On the other hand, for bottom heating devices that use gas as a heat source, it is essential to evacuate the insulated chamber that houses them.

Conventionally, exhaust from an insulated chamber was achieved by directly connecting the exhaust pipe to a connection port formed in the wall of the insulated chamber. In this case, the walls of the insulated chamber are formed from metal pallets and insulating material, and the metal panel that constitutes the wall is welded to the metal panel that constitutes the exhaust pipe at the connection port formed in the wall. This allows for smooth exhaust from inside the insulated chamber through the exhaust pipe.

However, the metal panel of the wall of the insulation chamber is relatively thicker than the metal panel of the exhaust pipe due to differences in function, and because of differences in the shapes of the two, the magnitude and direction of expansion and contraction of the metal panel when heating and heating is stopped differs, leading to deformation and welding problems around the connection port.

In particular, as mentioned above, the method of using this cooking device involves a repeated batch cycle of loading ingredients into a cooking container, cooking the ingredients, and discharging the finished product after cooking. In this cycle, high-temperature gas combustion occurs only during cooking, so the parts through which the combustion gas passes and the parts through which the combustion heat is transferred become hot only during this period. These hot parts experience a drop in temperature due to heat dissipation in the subsequent process. Therefore, the components of the parts through which the combustion gas passes and the parts through which the combustion heat is transferred periodically and repeatedly undergo thermal expansion and contraction in response to temperature changes in short cycles, making the device susceptible to fatigue due to deformation.

In addition, in order to maximize exhaust efficiency, the exhaust pipe needs to be attached to the insulated chamber as high up as possible, which means it is located below the heat exchange jacket of the cooking vessel. This caused problems with panel deformation or welding defects in this area affecting the heat exchange jacket.

Furthermore, insufficient deformation due to thermal expansion and contraction could cause excessive thermal stress, resulting in permanent deformation and cracks in the equipment, which could lead to the leakage of combustion gases outside the flue.

Patent No. 3076321 Patent No. 3650718

The problem to be solved is that in cooking devices that enable so-called hybrid heating, the connection of the exhaust pipe affects the heat exchange jacket and excessive thermal stress occurs.

The present invention relates to a cooking device that enables so-called hybrid heating, and is provided with a cooking vessel including a bottom and a body, a bottom heating device for heating the bottom of the cooking vessel to a high temperature by gas heating or a selective combination of electromagnetic induction heating for gas heating, electric heating, and steam heating, in order to avoid or suppress the influence of the connection of an exhaust pipe on a heat exchange jacket and to prevent the occurrence of excessive thermal stress, and a heat exchange jacket for forming a closed cross-sectional portion on a wall surface between the bottom and the body of the cooking vessel or on a wall surface of the body, and for performing heat exchange with the wall surface by a fluid heat medium supplied inside the closed cross-sectional portion, and the bottom heating device is mounted on a support stand. the heat exchange jacket is mounted directly or indirectly on the top plate so that the bottom faces the inside of the insulated chamber through the opening; the peripheral wall portion includes a circumferential metal panel and is provided with a connection port at the upper portion of the peripheral wall portion that connects the inside and outside of the insulated chamber; a fitting port is formed in an exhaust pipe connected to the connection port; the fitting port is fitted and connected to the connection port so that relative movement due to thermal expansion difference is possible; and the exhaust pipe is installed on the support base by exhaust pipe legs that allow the relative movement by sliding movement .

The present invention has the above configuration, so even if there is a difference in thermal expansion between the metal panel of the exhaust pipe and the metal panel of the insulated chamber, the fitting port can move relative to the connection port due to the difference in thermal expansion. This prevents or suppresses the generation of excessive stress between the fitting port and the connection port, avoids or suppresses the exhaust pipe connection from affecting the heat exchange jacket, and prevents the generation of excessive thermal stress.

FIG. 1 is a partially omitted overall configuration diagram of a cooking device capable of hybrid heating, omitting an exhaust pipe and the like (embodiment); FIG. 1 is a partially omitted overall configuration diagram of a cooking device capable of hybrid heating, omitting a control panel and the like (embodiment); 1 is an enlarged cross-sectional view of a portion including a cross section of a heat exchange jacket (Example); 1 is a cross-sectional view of a main part showing the connection of an exhaust pipe (embodiment); Fig. 1 is an enlarged plan view of a main portion showing the relationship between a fitting port of an exhaust pipe and a connection port of a heat-insulating chamber (embodiment);

The present invention achieves the objective of avoiding or suppressing the influence of the exhaust pipe connection on the heat exchange jacket and preventing the occurrence of excessive thermal stress in a cooking device that enables so-called hybrid heating, as follows:

This embodiment is a cooking device that includes a cooking vessel including a bottom and a body, a bottom heating device for heating the bottom of the cooking vessel to a high temperature by gas heating or a selective combination of electromagnetic induction heating for gas heating, electric heating, and steam heating, and a heat exchange jacket for forming a closed cross-sectional portion on a wall surface between the bottom and the body of the cooking vessel or on a wall surface of the body, and performing heat exchange with the wall surface by a fluid heat medium supplied to the inside of the closed cross-sectional portion, the bottom heating device being disposed in a thermal insulation chamber and provided below the cooking vessel, and the thermal insulation chamber constituting an upper portion The heat exchange jacket is mounted directly or indirectly on the top plate so that the bottom faces the inside of the thermal insulation chamber through the opening. The peripheral wall includes a circumferential metal panel and has a connection port at the top of the peripheral wall that connects the inside and outside of the thermal insulation chamber. An engagement port is formed in an exhaust pipe that connects to the connection port, and the engagement port is engaged with the connection port so that relative movement due to thermal expansion differences is possible. The exhaust pipe is installed using exhaust pipe legs that allow the relative movement.

The insulating chamber can also be configured to have a bottom wall.

The gas heating is essential. The selective combination of electromagnetic induction heating, electric heating, and steam heating with the gas heating can be in the form of a combination of any one of electromagnetic induction heating, electric heating, and steam heating with gas heating, or a combination of more than one of electromagnetic induction heating, electric heating, and steam heating with gas heating.

The cross section of the insulating chamber is circular, but it can also be rectangular or polygonal.

The opening in the upper wall is disposed, for example, in the center of the upper wall, which is circular in plan view. The opening can also be disposed offset from the center of the upper wall. The upper wall can also be formed in a rectangular, polygonal, or other shape in plan view.

When the heat exchange jacket is directly mounted on the top plate, the top plate is flat and the flat bottom surface of the heat exchange jacket is placed on it. When the heat exchange jacket is indirectly mounted on the top plate, the heat exchange jacket is placed on the top plate via a seat or the like. The cooking vessel is supported rotatably by a rotating shaft on one side in the diametric direction, and can be rotated so that the cooking vessel moves upward on the other side in the diametric direction around the rotating shaft. By reversing the rotation of the cooking vessel, the heat exchange jacket is placed directly or indirectly on the top plate. However, it is also possible to omit the configuration for rotating the cooking vessel and simply place the heat exchange jacket directly or indirectly on the top plate, fix it by welding while it is placed on it, or fasten it with the same bolts and nuts, etc.

The connection port provided at the upper part of the peripheral wall portion can be provided so as to penetrate from the inside to the outside between the upper edge of the insulating wall and the upper wall portion. The connection port can also be formed so as to penetrate from the inside to the outside of the upper part of the peripheral wall portion itself directly below the upper wall portion. The connection port has an outer end that protrudes outside the peripheral wall portion. The connection port can also be formed so that the outer end does not protrude outside the peripheral wall portion.

When the outer end of the connection port protrudes outside the peripheral wall, the fitting port of the exhaust pipe may be either an external or internal fit with respect to the connection port. When the outer end of the connection port does not protrude outside the peripheral wall, the fitting port of the exhaust pipe is an internal fit with respect to the connection port.

The exhaust pipe leg can be set to one or more. The exhaust pipe leg is set to allow relative movement due to the thermal expansion difference between the fitting port and the connection port. This setting is, for example, a form in which one of the exhaust pipe legs is fixed and the others are installed so that they can slide on the installation surface. However, it is also possible to install all of the multiple exhaust pipe legs so that they can slide. It is also possible to install all of the multiple exhaust pipe legs in a fixed manner. Even if all of the exhaust pipe legs are fixed, this can be handled by making the rod-shaped exhaust pipe leg rod-shaped and bending and deforming it according to the relative movement. In the case of a single exhaust pipe leg, it can also be handled by installing it so that it can slide on the installation surface. The exhaust pipe leg can also be configured as a coil spring or the like. The coil spring or the like can be configured as a part of the exhaust pipe leg.

When a connection port is provided between the peripheral wall portion and the upper wall portion, the outer end of the connection port is formed to protrude outward from the peripheral wall portion, and the upper panel is provided with a connection upper edge portion that partially protrudes outward from the peripheral wall portion and forms the outer end.

The upper connection edge protrudes integrally with the top plate. The upper connection edge can also be formed separately and welded to the outer edge of the top plate.

The top plate is formed to be relatively thicker than the metal panel of the peripheral wall. The top plate can also be formed to be as thick as the metal panel of the peripheral wall.

The heat-insulating chamber and bottom heating device are mounted on a common support stand, which is equipped with a weight detector that detects changes in the weight of ingredients during cooking and controls the heating of the bottom heating device. A part of the support stand is extended to the bottom of the exhaust pipe to set up an exhaust pipe mounting section, and the exhaust pipe legs are installed on the exhaust pipe mounting section.

[Hybrid heating cooking device]
Fig. 1 is a partially omitted overall configuration diagram of a cooking device capable of hybrid heating, omitting an exhaust pipe, etc. Fig. 2 is a partially omitted overall configuration diagram of a cooking device capable of hybrid heating, omitting a control panel, etc.

As shown in Figures 1 and 2, a cooking device capable of hybrid heating includes a cooking container 1, a bottom heating device 3, and a heat exchange jacket 5.

The cooking vessel 1 is a large cooking vessel in which ingredients such as vegetables are added and fried, or paste paste, sauce, soup, and other foods are boiled and cooked. The cooking vessel 1 includes a bottom 13 formed in a dish-like or spherical shape, and a body 15 rising from the outer periphery of the bottom 13. The bottom 13 is the lower part of the cooking vessel 1 formed of a sphere with a large radius of curvature. The body 15 forms the side wall of the cooking vessel 1 and is a part whose cross section rises straight. Between the bottom 13 and the body 15 is a curved corner 14. The bottom 13 is connected to the corner 14, and the body 15 rises from the corner 14 and is formed as a whole. However, the shape of the cooking vessel 1 is not particularly limited as long as it can divide the heating including the bottom 13 and the body 15. The cooking vessel 1 is made of iron, stainless steel, a multi-layered material of iron and stainless steel, or copper, or a combination of these. A temperature sensor (not shown) is attached to the outer periphery of the bottom 13 of the cooking vessel 1. This temperature sensor detects the wall temperature of the bottom 13, and its output is input to the control panel 11.

The bottom heating device 3 is disposed under the bottom 13 of the cooking vessel 1 and serves to heat the bottom 13. In this embodiment, the bottom heating device 3 is configured as a gas heating device that uses gas heating. The bottom heating device 3 is equipped with a plurality of gas burners 17, 19, and 21. The gas burners 17, 19, and 21 are disposed in a circular ring shape when viewed from above, with the gas burners 17 and 19 disposed on the inner ring side and the gas burner 21 disposed on the outer ring side, and the inner and outer rings can be controlled separately.

The gas burners 17, 19, and 21 are connected to a fuel gas supply source via gas piping. The gas piping is equipped with a solenoid valve, which can be driven and controlled by the control panel 11.

The heat exchange jacket 5 forms a closed cross-sectional portion on the wall surface on the outer periphery side of the bottom 13 of the cooking vessel 1. A fluid heat medium is supplied inside the closed cross-sectional portion to enable heat exchange with the wall surface. That is, in this embodiment, the heat exchange jacket 5 covers the corner portion 14 on the outer periphery side of the bottom 13. This heat exchange jacket 5 forms a closed cross-sectional portion on its outer surface from the bottom 13 on one side of the corner portion 14 to the body portion 15 on the other side. This heat exchange jacket 5 is formed continuously around the entire circumference of the cooking vessel 1. Therefore, heat exchange can be performed around the entire circumference of the cooking vessel 1 by the fluid heat medium supplied to the heat exchange jacket 5. However, the heat exchange jacket 5 can also be provided in a partitioned manner at predetermined lengths around the entire circumference of the cooking vessel 1. In this case, the fluid heat medium can be supplied and discharged to each partitioned heat exchange jacket by separate control.

The heat exchange jacket 5 is adapted to selectively supply and discharge steam, water, and air as a fluid heat medium using a medium supply and discharge device (not shown). When the heat exchange jacket 5 is used only for heating, the medium supply and discharge device supplies and discharges only steam as a fluid heat medium.

The medium supply and discharge device includes an upper pipe and a lower pipe (not shown), the upper pipe being connected to the upper side of the heat exchange jacket 5 on one side thereof, and the lower pipe being connected to the lower side on the other side thereof. The upper pipe is branched into three pipes, each equipped with a solenoid valve. Each of these solenoid valves is controlled to open and close by the control panel 11. One of the pipes is connected to a steam supply source (not shown). A pressure sensor is provided in this pipe, and the detected value is input to the control panel 11. One of the other pipes (not shown) is connected to a cooling water discharge section, and the remaining pipes are connected to a cooling air discharge section.

The lower pipe is branched into three pipes (not shown), each equipped with a solenoid valve. Each solenoid valve is controlled to open and close by the control panel 11. One of the pipes is connected to the steam exhaust side (not shown), the other pipe is connected to a cooling air supply source, and the remaining pipe is connected to a cooling water supply source.

The bottom heating device 3 is disposed in the insulated chamber 23 and is provided below the cooking vessel 1. The insulated chamber 23 and the bottom heating device 3 are mounted on a common support base 25 together with the control panel 11, etc. In other words, the bottom heating device 3, including the piping, etc., is supported on the insulated chamber 23 side, and the insulated chamber 23 is attached to the support base 25 by the insulated chamber legs 23a. The insulated chamber 23 will be described further below in relation to the heat exchange jacket 5.

The support base 25 is provided with a plurality of feet 27 for grounding. Each foot 27 is fitted with, for example, a load cell as the weight detector 9. The detection signal of the load cell of each foot 27 is input to the control panel 11. The weight detector 9 detects the weight change of the ingredients during cooking and provides heating control such as the supply of steam by the bottom heating device 3 and the medium supply and discharge device. By averaging the detected loads of the load cells attached to each foot 27, the total weight of the cooking vessel 1 and the heat exchange jacket 5 can be accurately detected. In particular, even if the ingredients are shifted to one side or moved by stirring in the cooking vessel 1 during cooking, the loads at each time are detected by the load cells attached to each foot 27 and the average is calculated, so that accurate weight detection can be performed successively. In this embodiment, the total weight of the cooking vessel 1 and the heat exchange jacket 5, including the heat insulation chamber 23, is detected.

The control panel 11, as a weight change storage device, stores in advance as a reference value the weight change according to the change in moisture content during heating in order to achieve the cooking purpose of the ingredients placed in the cooking vessel 1. The cooking purposes of ingredients include the following. For example, by maintaining an appropriate change in moisture content during and at the end of cooking, the sugar content of the ingredients can be appropriately controlled and the flavor of the ingredients after cooking can be accurately brought to the desired state. Or, the moisture content can be appropriately changed so that the ingredients do not burn during cooking. Furthermore, some ingredients can be intentionally burned to add flavor or color due to the burnt taste.

To achieve the cooking purpose of these ingredients, the weight detector 9 attached to the foot 27 detects the weight change of the ingredients according to the change in moisture content during heating according to the cooking purpose through experiments in advance, and controls it by comparing it with a reference value previously stored in the control panel 11. In particular, since the types and amounts of ingredients, water, and seasonings added vary depending on the cooking purpose, such as stir-frying vegetables, making paste paste, sauces, and soups, and reducing other foods, and even stewing foods, the relationship between these addition conditions and the weight change according to the optimal moisture content change during cooking, and the relationship between the optimal moisture content and weight at the end of heating are all previously determined through experiments, and these are stored in the control panel 11 as reference values.

The control panel 11 also functions as a drive control device, calculating the change in weight of the ingredients placed in the cooking container 1 from the change in the total weight detected by the weight detector 9, and controls the drive of the bottom heating device 3 and the medium supply/discharge device so that the change in weight of the ingredients matches the reference value.

The cooking vessel 1 has an agitating blade (not shown) inserted from above, allowing it to heat and agitate. The cooking vessel 1 is rotatably supported by a rotating shaft 29 on one diametric side. The rotating shaft 29 is rotatably supported on a shaft support portion provided on the support base 25. A piston cylinder device is connected to the cooking vessel 1 via a bracket or the like, and the cooking vessel 1 can be reversed by driving the piston cylinder device so that it moves upward on the other diametric side around the rotating shaft 29. This driving allows the ingredients in the cooking vessel 1 to be discharged after cooking.

The heat-insulating chamber 23 has an upper wall portion 33 that forms the upper portion and a peripheral wall portion 35 that forms the side periphery. The heat-insulating chamber 23, the upper wall portion 33, and the peripheral wall portion 35 will be described further below in relation to the heat exchange jacket 5.

The upper part of the peripheral wall portion 35 is provided with a connection port 37 that connects the inside and outside of the insulation chamber 23. The fitting port 41 of the exhaust pipe 39 is connected to this connection port 37.

An exhaust tube leg 43 is attached to the exhaust tube 39. The exhaust tube 39 is installed on the exhaust tube mounting part 25a (described later) by the exhaust tube leg 43. The exhaust tube mounting part 25a is set by extending a part of the support base 25 to the lower part of the exhaust tube 39. Therefore, the cylinder mounting part 25a constitutes a part of the support base 25.

The connection port 37, exhaust tube 39, fitting port 41, exhaust tube leg portion 43, and exhaust tube mounting portion 25a will be described further below.

Figure 3 is an enlarged cross-sectional view of a portion including a cross section of the heat exchange jacket. In order to explain the relationship between the connection port 37 and the heat exchange jacket 5 and the heat insulation chamber 23, the heat insulation chamber 23 will first be described in detail in relation to the heat exchange jacket 5.

As shown in FIG. 3, the heat exchange jacket 5 has a jacket side wall 5a and a jacket bottom wall 5b. The jacket side wall 5a and the jacket bottom wall 5b are joined together by welding or the like.

The jacket side wall 5a is formed vertically in the direction of gravity and parallel to the body 15. The upper end of the jacket side wall 5a is curved inward, and the edge is butted against the outer surface of the body 15 and joined by welding or the like. The jacket bottom wall 5b is formed horizontally flat. The inner end of the jacket bottom wall 5b is curved upward, and the edge is butted against the outer surface of the bottom 13 and joined by welding or the like. The outer end of the jacket bottom wall 5b is butted against the jacket side wall 5a from the inside and joined by welding or the like. In this case, the lower edge 5aa of the jacket side wall 5a protrudes downward from the jacket bottom wall 5b, and a rising portion 5ab is provided on the outer periphery of the heat exchange jacket 5.

The insulated chamber 23 has an opening 31 on the inner circumferential side of the upper wall portion 33, which allows the bottom 13 of the cooking vessel 1 to face the inside of the insulated chamber 23. The peripheral wall portion 35 of the insulated chamber 23 has inner and outer circumferential insulating walls 47, 49. The upper wall portion 33 is fixed to the upper ends of the inner and outer circumferential insulating walls 47, 49. A circular cavity portion 51 is formed between the insulating walls 47, 49.

The upper wall portion 33 includes a circular insulating wall 53 and an upper plate 55. The insulating wall 53 includes a ceramic insulating material 53b on a thin plate 53a, which is a metal panel such as stainless steel, and an angle bar 53c is integrally formed on the inner periphery. The upper plate 55 is a metal panel such as stainless steel, and is joined from the angle bar 53c to the insulating material 53b in the circumferential direction. The upper plate 55 is formed to be relatively thicker than the thin plates 47a, 49a, and 49b of the peripheral wall portion 35, with a thickness that takes into consideration prevention of deformation and cracking. The inner edge of the upper plate 55 has a diameter slightly larger than the inner peripheral surface of the angle bar 53c, and the outer edge of the upper plate 55 has a diameter slightly larger than the outer peripheral surface of the insulating material 53b.

The inner insulating wall 47 is a cylindrical thin plate 47a, which is a metal panel made of stainless steel or the like, supporting a ceramic or other insulating material 47b. The upper part of the thin plate 47a extends upward beyond the insulating material 47b, reaches the inner periphery of the upper wall portion 33, and is joined to the inner periphery of the angle iron 53c by welding or the like. The thin plate 47a has multiple holes (not shown) for ventilation between the insulating material 47b and the upper wall portion 33.

The outer insulating wall 49 is supported by a ceramic or other insulating material 49c sandwiched between cylindrical inner and outer thin plates 49a, 49b. The upper edges of the inner thin plate 49a and the insulating material 49c are formed at the same height, and the lower surface of the upper wall portion 33 is joined and supported by the upper edges of the inner thin plate 49a and the insulating material 49c. The outer thin plate 49b protrudes upward beyond the upper edges of the inner thin plate 49a and the insulating material 49c. The upper part of the thin plate 49b surrounds the outer periphery of the insulating material 53b of the upper wall portion 33 with a gap. The upper edge of the thin plate 49b is abutted against the lower surface of the upper plate 55 of the upper wall portion 33 and welded.

The upper wall portion 33 is provided with a seat portion 57. The seat portion 57 is formed in a circumferential shape around the opening 31. In other words, the inside dimension of the seat portion 57 constitutes the inside dimension of the opening 31. However, the inside dimension of the seat portion 57 can also be set to be larger than the inside dimension of the opening 31. The opening 31 can also be directly constituted by the inner periphery of the upper wall portion 33.

The seat 57 is provided with an angle iron 59 and a thermal insulator 61 made of ceramic or the like. The angle iron 59 is arranged with its inside dimension facing the opening 31 and is joined to the upper surface of the inner edge of the upper plate 55 by welding or the like. The thermal insulator 61 is provided on the inside dimension of the angle iron 59. The lower part of the thermal insulator 61 is formed so as to cover the upper inner surface of the thin plate 47a on the inner side of the angle iron 53c of the upper wall portion 33. In this embodiment, the inner surface of the thermal insulator 61 forms the inner circumference of the opening 31.

The cooking vessel 1 is placed on the heat-insulating chamber 23, and the jacket bottom wall 5b of the heat exchange jacket 5 is placed on the angle bar 59 of the seat 57, and the steam jacket 5 is indirectly mounted on the upper plate 55. As described above, the cooking vessel 1 is rotated around the rotating shaft 29 so as to move upward to the other side in the diameter direction, and after the cooked food in the cooking vessel 1 is discharged, the jacket bottom wall 5b of the steam jacket 5 is received on the angle bar 59 when the rotation is returned. At this time, the flat surface of the jacket bottom wall 5b is in close contact with the flat surface on the angle bar 59 in a circumferential manner, and the airtightness inside and outside the heat-insulating chamber 23 on the upper plate 55 is maintained. The angle bar 59 is made difficult to transfer heat from the inside of the heat-insulating chamber 23 by the heat insulating material 61. As a result, heat transfer from the inside of the heat-insulating chamber 23 to the heat exchange jacket bottom wall 5b via the angle bar 59 is suppressed. The bottom 13 of the cooking vessel 1 faces the inside of the heat-insulating chamber 23 from the opening 31.

An air layer 63 is provided between the top plate 55 of the upper wall portion 33 of the heat insulating chamber 23 and the jacket bottom wall 5b of the heat exchange jacket 5, forming the outside of the heat insulating chamber 23. Both the top plate 55 and the jacket bottom wall 5b are flat, and the air layer 63 is formed in a doughnut shape with approximately equal vertical dimensions. This air layer 63, together with the top wall portion 33, thermally separates the heat exchange jacket 5 from the bottom heating device 3.

The rising portion 5ab of the heat exchange jacket 5 faces the upper wall portion 33 of the heat insulation chamber 23, and the lower edge is close to or in contact with the outer edge of the upper plate 55. Therefore, the space between the heat exchange jacket 5 and the upper wall portion 33 is almost closed on the outer periphery of the heat exchange jacket 5, outside the air layer 63.

[Exhaust stack connection structure]
Fig. 4 is a cross-sectional view of the main part showing the connection of the exhaust pipe, and Fig. 5 is an enlarged plan view of the main part showing the relationship between the fitting port of the exhaust pipe and the connection port of the heat-insulating chamber.

As shown in Figures 4 and 5, in this embodiment, the connection port 37 is provided between the insulating wall 49 on the outer periphery of the peripheral wall portion 35 and the upper wall portion 33. An exhaust pipe 39 is connected to this connection port 37, and exhaust caused by combustion of the bottom heating device 3 in the insulating chamber 23 is performed from this exhaust pipe 39.

The fitting connection of the fitting port 41 to the connection port 37 is made so as to allow relative movement due to differences in thermal expansion. Specifically, the exhaust pipe 39 is formed separately from the thermal insulation chamber 23, and the fitting port 41 is connected to the connection port 37 by fitting, and is not fixed by welding.

The connection port 37 is formed, for example, with a horizontally long rectangular cross section. However, the cross-sectional shape of the connection port 37 can be freely set, and it can also be formed with a circular cross section, an elliptical cross section, a polygonal cross section, etc.

The outer end of the connection port 37 is formed to protrude outward from the peripheral wall portion 35. The upper plate 55 is partially protruded outward from the peripheral wall portion 35 in correspondence with the connection port 37. The partially protruding portion of the upper plate 55 constitutes the outer end at the upper part of the connection port 37 as the connection upper edge portion 55a. The base 65 is joined by welding or the like to the lower surface of this connection upper edge portion 55a. The base 65 has left and right connection side edges 65a and a lower connection lower edge portion 65b. The upper edges of the left and right connection side edges 65a are welded and joined to the lower surface of the connection upper edge portion 55a to form the side and lower parts and the outer end of the connection port 37. The base 65 is extended inward from the insulation chamber 23 so as to penetrate the insulation wall 49 on the outer periphery of the insulation chamber 23. The base 65 has an inner end facing the hollow portion 51. The connection side edge 65a and the connection lower edge 65b of the base 65 are welded to the thin plates 49a and 49b of the insulating wall 49.

The exhaust pipe 39 is formed by connecting a chimney portion 69 to a chimney receiver 67 and disposing a ventilation cover 71 such as a perforated plate or mesh around the chimney portion 69. The chimney receiver 67 has one side portion 67a with a rectangular cross section. The rectangular fitting opening 41 is provided at the end of the one side portion 67a.

The fitting opening 41 has a fitting upper edge 41a and left and right fitting side edges 41b. The fitting upper edge 41a and the left and right fitting side edges 41b protrude from the end of one side portion 67a. The fitting upper edge 41a and the fitting side edges 41b protrude further than the lower fitting lower edge 41c.

When fitted into the connection port 37, the upper mating edge 41a is joined by metal contact to the upper surface of the upper connection edge 55a of the connection port 37. The left and right side edges 41b are joined by metal contact to the outer surfaces of the connection side edges 65a of the connection port 37. The lower mating edge 41c abuts against the lower connection edge 65b of the connection port 37.

The mating connection of the mating port 41 to the connection port 37 allows for relative movement due to differences in thermal expansion.

The exhaust pipe leg 43 places the exhaust pipe 39 on the exhaust pipe mounting part 25a and allows the relative movement. The exhaust pipe leg 43 consists of pipe parts 43a, 43b and screw-adjustment parts 43c, 43d that are adjusted by screw-adjustment, and as shown in Figure 5, two of them are arranged so that they are inclined relative to the connection port 37 and the fitting port 41. This arrangement is uniform in the radial direction in the circular cross section of the chimney part 69, and the inclination is approximately 45°.

The head of the bolt at the lower end of the threaded adjustment part 43c abuts on the exhaust pipe mounting part 25a. The head of this bolt is not fixed to the installation surface on the exhaust pipe mounting part 25a by welding or the like. In other words, the pipe part 43a of the exhaust pipe leg part 43 and the threaded adjustment part 43c are the contact points of the support that releases the load of the exhaust pipe 39 to the exhaust pipe mounting part 25a , and allow the head of the bolt at the lower end to slide and move on the exhaust pipe mounting part 25a. In contrast, the other threaded adjustment part 43d has a structure in which the head of the bolt at the lower end is fixed to the flange part by welding or the like, and this flange part is fixed to the exhaust pipe mounting part 25a by a chimney support fixing bolt.

When the exhaust pipe leg 43 is mounted on the exhaust pipe mounting portion 25a, the weight of the exhaust pipe 39 is detected by the weight detector 9 together with the heat-insulating chamber 23, etc. The length of the exhaust pipe leg 43 can be set by adjusting the screw-in adjustment portions 43c, 43d to the pipe portions 43a, 43b, allowing for an accurate fitting connection between the connection port 37 and the fitting port 41.

[Relative movement]
For example, even if there is a difference in the magnitude and direction of thermal expansion and contraction between the connection port 37 of the insulated chamber 23 and the fitting port 41 of the exhaust tube 39 during steam heating or gas heating, the connection port 37 and the fitting port 41 can move relatively in response to the expansion and contraction due to the non-fixed fitting connection between the connection port 37 and the fitting port 41.

In addition, if the deformation caused by the expansion and contraction of the pot (the entire pot including the cooking vessel 1) and each part of the exhaust pipe 39 exceeds the gap of the fitting connection between the connection port 37 and the fitting port 41, the deformation is transmitted from the connection port 37 to the fitting port 41, and the exhaust pipe 39 is subjected to an excessive moving force. At this time, the screw adjustment part 43c is displaced by sliding movement on the exhaust pipe mounting part 25a, and the pipe part 43b is bent in the bending direction, allowing the movement and displacement of the screw adjustment part 43c. Therefore, it is possible to allow the displacement due to thermal stress between the connection port 37 and the fitting port 41, and the occurrence of deformation in the heat exchange jacket bottom wall 5b, etc., can be suppressed, and the occurrence of cracks can be suppressed.

Furthermore, this relaxation of thermal stress maintains the dimensional accuracy between the seat portion 57 and the jacket bottom wall 5b, and reduces the leakage of combustion gas from this area.

As a result, no excessive stress acts between the connection port 37 and the fitting port 41, and deformation of the upper plate 55, etc. can be prevented or suppressed. By preventing deformation of the upper plate 55, etc., the heat exchange jacket 5 above the upper plate 55 is not affected, and normal operation of the heat exchange jacket 5 can be maintained.

When the chimney receiver 67 is slightly displaced from the installed state during expansion and contraction due to heating, the displacement is absorbed by the movement of the screw adjustment part 43c onto the exhaust pipe mounting part 25a and the bending of the pipe part 43b in the bending direction. This allows the relative movement between the connection port 37 and the fitting port 41 to be performed smoothly when heated.

When installing the exhaust pipe 39, the upper mating edge 41a of the fitting port 41 can be fitted diagonally onto the upper connecting edge 55a of the connection port 37 from above, making it easy to fit and connect the connection port 37 and the fitting port 41 together.

If a vertical gap occurs between the fitting upper edge 41a and the connection upper edge 55a during this installation, the vertical position and inclination of the chimney receiver 67 relative to the thermal insulation chamber 23 are corrected by adjusting the screw adjustment parts 43c and 43d. This correction allows for an accurate fitting connection between the connection port 37 and the fitting port 41 through metal contact.

[Cooking]
When cooking with heat, ingredients such as vegetables, water as necessary, and seasonings are first put into the cooking container 1. The amounts of these are added according to predetermined reference values. The timing of adding water, seasonings, etc. may differ from the start of heating depending on the cooking purpose, and the amounts added are changed depending on the cooking purpose. These are determined in advance by experimentation in order to obtain an appropriate moisture content. Since the timing of addition is determined in advance by experimentation, it is extremely easy to grasp the amounts of ingredients, water, seasonings, etc. to be added depending on the cooking purpose, and operability is significantly improved.

Then, the system is started by drive control of the control panel 11. The bottom heating device 3 and the medium supply and discharge device are driven and controlled by the control panel 11 according to a preset program. This drive control causes fuel gas to be ejected from each gas burner 17, 19, 21 of the bottom heating device 3, and ignition is performed by automatic ignition controlled by the control panel 11. As a result, the bottom of the cooking vessel 1 is heated to a high temperature by gas heating.

At the same time, the control panel 11 drives and controls the medium supply and discharge device to supply steam from the steam supply source into the heat exchange jacket 5. The steam supplied is selected from various types, such as saturated steam and superheated steam, depending on the heating purpose. The steam supplied into the heat exchange jacket 5 exchanges heat with the wall surface on the outer periphery side of the bottom 13 of the cooking vessel 1, and the cooking vessel 1 is heated in that portion.

During the cooking process, the change in moisture content in the cooking vessel 1 is an extremely important factor related to the sugar content, saltiness, flavor concentration, etc. of the ingredients, or to scorching. Therefore, the total weight including the exhaust pipe 39 is detected by the load cells of the weight detector 9 attached to each leg 27, and the product weight is calculated as the weight of the ingredients. In other words, the control panel 11 sequentially calculates the change in weight of the ingredients in the cooking vessel 1 based on the detected total weight. The result of this calculation is compared with a reference value, and the bottom heating device 3 and the medium supply and discharge device are controlled so that it matches this. Note that the reference value can also be set to the total weight change including the cooking vessel 1 etc. according to the moisture content during cooking, and the control can be performed by directly comparing the detected total weight with this reference value.

If the product weight is above the set value, the moisture content is determined to be higher than the set value, and if the product weight is below the set value, the moisture content is determined to be equal to or lower than the set value.

For example, on the bottom heating device 3 side, the gas burner 21 on the outer ring side and the gas burners 17 and 19 on the inner ring side are selectively stopped.

By controlling the heating as described above, even if a large amount of vegetables and other ingredients are placed in the cooking container 1 up to the top, they can be heated quickly by the bottom heating device 3 and by heat exchange in the heat exchange jacket 5.

When the ingredients placed in the cooking vessel 1 are vegetables, for example, and these are to be stir-fried, the vegetables placed all the way to the top of the cooking vessel 1 will gather on the bottom 13 side in a short time, and high-temperature cooking can be performed by gas heating on the bottom 13 side.

When high-temperature cooking is performed using only gas heating at the bottom 13 as described above, if the vegetables, which were initially loaded all the way to the top of the heating pot 1, are heated intensely with high gas temperatures in an attempt to quickly gather them toward the bottom 13, the vegetables will easily burn. Also, if the degree of gas heating is reduced in an attempt to avoid such burning, it will take too long for the vegetables to gather toward the bottom 13.

In contrast, by heating the bottom 13 with gas as described above and by heating by heat exchange on the body 15 side with steam, a large amount of vegetables and other foods can be quickly concentrated on the bottom 13 side in a short time, and can be quickly heated to high temperatures by gas heating. In other words, high-temperature cooking can be performed in a short time by so-called hybrid heating.

When the supply of steam to the closed cross-section by the heat exchange jacket 5 is stopped, the temperature inside the insulated chamber 23 is high due to high-temperature heating by the bottom heating device 3. Since high-temperature heating by the bottom heating device 3 continues, the high-temperature state inside the insulated chamber 23 continues.

However, drainage may remain inside the heat exchange jacket 5. When the high temperature of the insulated chamber 23 is transferred to the heat exchange jacket 5, the drainage begins to evaporate, and the heat of evaporation may take away heat from the ingredients when the bottom 13 is heated to high temperatures.

In this embodiment, the high temperature heat in the heat-insulating chamber 23 is blocked by the heat-insulating wall 53 and the top plate 55. Additionally, the air layer 63 prevents heat from being directly transferred to the jacket bottom wall 5b of the heat exchange jacket 5. In this case, even if there is a difference in the magnitude and direction of thermal expansion and contraction between the connection port 37 of the heat-insulating chamber 23 and the fitting port 41 of the exhaust pipe 39 as described above, no undue stress is applied, so the effect on the heat exchange jacket 5 can be prevented or suppressed.

In addition, the adhesion between the jacket bottom wall 5b of the heat exchange jacket 5 and the angle iron 59 can be accurately maintained all around. This adhesion can also reliably prevent exhaust gas from leaking into the air layer 63.

As a result, the air layer 63 functions normally, and when the bottom 13 is heated to a high temperature, heat from the ingredients is prevented from being lost due to the heat of evaporation from the drain, allowing for more advanced high-temperature cooking in a short time.

The rising portion 5ab covers the outer periphery of the air layer 63, so it is possible to prevent or suppress the liquid flowing down the outer surface of the heat exchange jacket 5 from penetrating into the insulated chamber 23 through the air layer 63. In this case, too, since no excessive stress acts between the connection port 37 and the fitting port 41, the function of the rising portion 5ab can be accurately maintained, and the penetration of liquid from the outside can be prevented or suppressed.

In this type of cooking, the ingredients in the cooking container 1 can be stirred and cooked by operating the stirring device, and high-temperature, high-speed stirring cooking can be performed overall.

1 Cooking vessel 3 Gas heating device (bottom heating device)
5 Heat exchange jacket 9 Weight detector "
Reference Signs List 13 Bottom 15 Body 23 Insulated chamber 25 Support stand 25a Exhaust tube mounting portion 31 Opening 33 Upper wall portion 35 Peripheral wall portion 37 Connection port 41 Fitting port 41a Fitting upper edge portion 43 Exhaust tube leg portion 45 Exhaust tube mounting portions 49a, 49b Thin plate (metal panel)
55 Top plate (metal panel)
55a Connection upper edge

Claims (4)

A cooking device comprising: a cooking vessel including a bottom and a body; a bottom heating device for heating the bottom of the cooking vessel to a high temperature by gas heating or a selective combination of electromagnetic induction heating for gas heating, electric heating, and steam heating; and a heat exchange jacket for forming a closed cross-sectional portion on a wall surface between the bottom and the body of the cooking vessel or on a wall surface of the body, and for performing heat exchange with the wall surface by a fluid heat medium supplied to the inside of the closed cross-sectional portion,
The bottom heating device is disposed in an insulated chamber mounted on a support base and disposed below the cooking vessel;
The heat-insulating chamber includes an upper wall portion constituting an upper portion and a peripheral wall portion constituting a side peripheral portion,
the top wall portion includes a metal panel top plate and has an opening;
The heat exchange jacket is directly or indirectly mounted on the top plate so that the bottom faces the inside of the thermal insulation chamber through the opening;
The peripheral wall portion includes a circumferential metal panel,
A connection port is provided at an upper portion of the peripheral wall portion to communicate the inside and the outside of the heat-insulating chamber,
A fitting port is formed in an exhaust pipe connected to the connection port,
the fitting port is fitted and connected to the connection port so as to enable relative movement due to a thermal expansion difference;
The exhaust pipe is installed on the support base by an exhaust pipe foot that allows the relative movement by sliding movement .
A cooking device characterized by: The cooking device according to claim 1,
When a connection port is provided between the peripheral wall portion and the upper wall portion, an outer end of the connection port is formed to protrude outward from the peripheral wall portion,
The upper plate is provided with a connecting upper edge portion that partially projects outward from the peripheral wall portion to form the outer end.
A cooking device characterized by: The cooking device according to claim 2,
The upper plate is formed to be relatively thicker than the metal panel of the peripheral wall portion.
A cooking device characterized by: The cooking device according to claim 1,
The heat insulating chamber and the bottom heating device are mounted on a common support;
The support base is provided with a weight detector that detects a change in weight of the food material during cooking and uses the weight detector to control the heating of the bottom heating device.
A part of the support base is extended to a lower part of the exhaust stack to set an exhaust stack mounting part;
The exhaust pipe leg is installed on the exhaust pipe mounting part.
A cooking device characterized by:

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