JP6916689B2 - Steam convection oven and steam generator - Google Patents

Description

The present invention relates to a steam convection oven for cooking ingredients such as fish and meat using steam, and a steam generator for generating steam.

A steam convection oven is known that uses steam to cook ingredients such as fish and meat. In the conventional steam convection oven, it is common to generate steam by a steam generator which is separately arranged outside the oven and has a dedicated heat source, and introduces such steam into the oven. However, if a separate steam generator is placed outside the oven, there are problems such as the overall size and complexity of the device, and the loss of heat energy of steam when introducing steam into the oven. .. Therefore, in recent years, a steam convection oven has been proposed in which a steam generator having a dedicated heat source is not separately arranged.

For example, in Patent Document 1 (Japanese Unexamined Patent Publication No. 2011-141098), water introduced into an oven through a water pipe is diffused into a heat exchanger in the oven using a fan provided with a plurality of blades. A steam convection oven that produces steam is disclosed. In the steam convection oven of Patent Document 1, a diffusion member having a slit is provided in the shaft portion of the fan, and the water diffused in the heat exchanger is miniaturized to improve the evaporation efficiency of water.

Japanese Unexamined Patent Publication No. 2011-141098

However, in the steam convection oven described in Patent Document 1, while the evaporation efficiency of water diffused in the heat exchanger can be increased, a box-shaped diffusion member having a diffusion slit is provided in the shaft portion of the fan. Therefore, it is necessary to design the shape of the diffusion member in accordance with the shape of the fan (shape of the blade) in consideration of high mounting accuracy, and it is necessary to design the diffusion member having a complicated shape. In addition, the water distributed to the diffusion member via the water pipe contains inorganic substances that cause stains, and if the steam convection oven is used continuously, not only the water pipe but also a complicated shape will be formed. Dirt will also adhere to the diffusion member. When cleaning the diffuser to remove this dirt, it is necessary to remove the diffuser from the fan, but usually the diffuser is fixed in a complicated configuration so that it can rotate integrally with the fan, and it can be removed. It takes time and effort to work. Further, since the diffusion member itself has a complicated shape as described above, there is a problem that the cleaning work itself takes time and effort.

The present invention has been made in view of the above problems, and provides a steam convection oven provided with a steam generator that can be easily cleaned while increasing the evaporation efficiency of water with a simple configuration.

The steam convection oven according to one aspect of the present invention includes a fan arranged in an oven chamber and having a plurality of blades, a heat exchange pipe arranged around the fan, and the like.
It includes at least one sprinkler hole and a nozzle portion having at least one diffusion plate extending downward from the back surface, and includes a water distribution pipe for distributing supply water supplied to the fan.

According to this configuration, the supply water distributed to the fan is used as minute water droplets to improve the evaporation efficiency of the supply water by a simple configuration using the sprinkler holes provided in the nozzle portion and the diffusion plate. be able to. Further, since the diffusion plate is provided in the nozzle portion of the water distribution pipe, dirt adhering to the diffusion plate can be cleaned integrally with the water distribution pipe, so that it can be easily cleaned.

Further, in the steam convection oven of the present invention, the diffusion plate is located between the tip of the nozzle portion and the sprinkler hole, and between two adjacent sprinkler holes, and faces the blade in the vertical direction. It is preferable that the position is arranged.

Further, in the steam convection oven of the present invention, it is preferable that the tip of the nozzle portion is arranged at a position facing the vicinity of the rotation center of the fan and at a position facing the blade in the vertical direction.

Further, in the steam convection oven of the present invention, it is preferable that the nozzle portion is detachably provided with respect to the water distribution pipe.

The steam generator according to one aspect of the present invention includes a fan having a plurality of blades, a heat exchange pipe arranged around the fan, at least one watering hole, and at least one extending downward from the back surface. It is provided with a nozzle portion having one diffusion plate, and is provided with a water distribution pipe for distributing supply water supplied to the fan.

According to this configuration, the water sprinkling hole and the diffusion plate provided in the nozzle portion make the supply water distributed to the fan into minute water droplets, and the evaporation efficiency of the supply water can be improved. Further, since the diffusion plate is provided in the nozzle portion of the water distribution pipe, dirt adhering to the diffusion plate can be cleaned integrally with the water distribution pipe, so that cleaning can be performed efficiently.

According to the present invention, it is possible to provide a steam convection oven provided with a steam generator that can be easily cleaned while increasing the evaporation efficiency of water with a simple configuration.

It is a perspective view which showed typically the structure of the steam convection oven which concerns on one Embodiment of this invention. It is a perspective view which showed typically the structure of the steam convection oven which concerns on one Embodiment of this invention. It is a perspective view which showed typically the structure of the steam generator which concerns on one Embodiment of this invention. It is a top view which shows typically the structure of the water pipe in the steam generator which concerns on one Embodiment of this invention. It is a side view which shows typically the structure of the water pipe in the steam generator which concerns on one Embodiment of this invention. It is a bottom view which shows typically the structure of the water pipe in the steam generator which concerns on one Embodiment of this invention. It is a side view which shows typically the path of the supply water in the steam convection oven which concerns on one Embodiment of this invention.

Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. The same reference numerals are given to the common constituent requirements in the drawings. It should also be noted that the components represented in one drawing may be omitted in another for convenience of explanation. Furthermore, it should be noted that the attached drawings are not always drawn to the correct scale.

1. 1. Configuration of Steam Convection Oven The steam convection oven 1 of one embodiment will be described below with reference to FIGS. 1 and 2. 1 and 2 are both perspective views schematically showing the configuration of the steam convection oven 1 according to the embodiment, and FIG. 1 shows a state in which the door portion 20 provided in the housing 10 so as to be openable and closable is closed. FIG. 2 shows a state in which the door portion 20 is opened and the partition plate 70 is removed.

As shown in FIGS. 1 and 2, the steam convection oven 1 according to the embodiment is capable of oven cooking with hot air, steam cooking with steam, and cooking in combination thereof. The steam convection oven 1 includes a substantially box-shaped housing 10 which is hollow and has an oven storage 50 inside, and a door portion 20 with a handle 21 which is provided in the housing 10 so as to be openable and closable. Further, on the outer wall surface of the housing 10, an operation unit 30 capable of operating settings such as a cooking mode and cooking conditions is provided. Further, on the lower side of the housing 10, legs 40 that support the housing 10 from below and can adjust the height of the steam convection oven 1 are provided.

A window portion 22 formed of glass is provided on a part of the door portion 20 so that the inside of the oven chamber 50 can be visually recognized from the outside of the steam convection oven 1. As described above, the door portion 20 is provided so as to be openable and closable with respect to the housing 10, so that food can be taken in and out of the oven chamber 50. As the glass forming the window portion 22, it is preferable to use a heat-resistant glass plate or a heat-resistant tempered glass plate so that it can withstand the high temperature in the oven chamber 50. Further, the low emissivity glass may be arranged so that the heat inside the oven 50 is not released as external heat to the outside of the oven 50.

As shown in FIGS. 1 and 2, the inside of the oven 50 is divided into two by an easily removable partition plate 70, and the cooking chamber 50a is generated on the right side of the oven 50 and steam is generated on the left side. Each chamber 50b is provided.

In the cooking room 50a, a plurality of trays 60 on which desired ingredients (food to be cooked) are placed are housed side by side in the vertical direction. Each of the plurality of trays 60 is housed at a constant interval in the vertical direction (as shown in FIG. 1, a constant interval in the upward and downward directions on the paper surface), and the temperature and steam unevenness in all the trays 60. Is configured so that

The end of the tray 60 is supported on the partition plate 70 (one surface of the partition plate 70 and forming the cooking chamber 50a) on the cooking chamber 50a side, and the tray 60 is viewed from the outside of the cooking chamber 50a. A guide rail 61 may be provided to facilitate the carry-in to the inside and the carry-out from the inside to the outside of the cooking chamber 50a.

As shown in FIG. 2, the steam generator 100, which will be described later, is housed in the steam generator chamber 50b. The partition plate 70 that separates the cooking chamber 50a and the steam generating chamber 50b communicates the cooking chamber 50a and the steam generating chamber 50b, and leads out the air (hot air) existing in the cooking chamber 50a to the steam generating chamber 50b. For example, a substantially lattice-shaped first vent (not shown) is provided. Further, the cooking chamber 50a and the steam generating chamber 50b are communicated in the same manner, and the steam generated by the steam generating device 100 housed in the steam generating chamber 50b is led out to the cooking chamber 50a, for example, in a substantially grid pattern. A second vent (not shown) is provided. The first vent is provided in the partition plate 70 at a portion facing the fan 110 described later (near the central portion of the partition plate 70), and the second vent is the first vent in the partition plate 70. It is provided on the outside of the ventilation hole (near the end of the partition plate 70). By providing the first vent and the second vent in the partition plate 70, air and steam heated to a high temperature can be circulated between the cooking chamber 50a and the steam generating chamber 50b.

2. Configuration of Steam Generator 100 Next, the steam generator 100 housed in the steam generator chamber 50b in the oven chamber 50 will be described with reference to FIGS. 2 to 6. FIG. 3 is a perspective view schematically showing the configuration of the steam generator 100 according to the embodiment. 4 to 6 are a top view (FIG. 4), a side view (FIG. 5), and a bottom view (FIG. 6) schematically showing the configuration of the water pipe 130 in the steam generator 100 according to the embodiment. be. Note that FIG. 6 shows the water pipe 130 when the back surface of the nozzle portion 132, which will be described later, is viewed from the front.

As shown in FIGS. 2 and 3, the steam generator 100 distributes supply water to a fan 110 having a plurality of blades 112, a heat exchange pipe 120 arranged around the fan 110, and the fan 110. Mainly includes the water distribution pipe 130.

2-1. Configuration of Fan 110 The fan 110 is mainly composed of a base portion 111, a blade 112, and a shaft portion 113. Specifically, the base portion 111 is a circular metal plate, and a central hole (not shown) is formed in the center thereof, and the shaft portion 113 is inserted through the base portion 111. Further, on the base portion 111, a plurality of (for example, 12) blades 112 are arranged in a ring shape and at equal intervals (for example, in the case of 12 blades 112, at intervals of a central angle of 30 degrees). .. The blade 112 is preferably made of metal, and one end surface of the blade 112 is fixed to the base portion 111 by, for example, welding. On the other hand, the other end surface of the blade 112 is arranged at a position facing the base portion 111 at a predetermined distance in the axial direction of the fan 110 with respect to the base portion 111, and is fixed on the support plate 114 having a substantially annular shape. Will be done. As a result, the blade 112 can be reliably fixed by supporting the blade 112 between the base portion 111 and the support plate 114 so as to be sandwiched from both directions.

For the shaft portion 113, for example, a metal bolt or the like can be used, and as described above, a motor that is inserted into the center hole provided in the base portion 11 and serves as a power source for the fan 110 (FIGS. 2 to 6). Not shown. It is integrated with the rotation axis of reference numeral 200) in FIG. Further, the shaft portion 113 is fixed to the base portion 111 via the auxiliary plate 113a, and the rotational force (rotational speed) based on the drive of the motor is transmitted to the base portion 111.

2-2. Configuration of the Heat Exchange Pipe 120 As shown in FIGS. 2 and 3, the heat exchange pipe 120 is made of metal and has a cylindrical shape, and is arranged so as to cover the periphery of the fan 110 as a whole. Specifically, one end 121 of the heat exchange pipe 120 is arranged so as to be located on the upper side of the fan 110, and the one end 121 is configured so that the inner diameter is larger than that of the other parts. Contains a gas burner (not shown, for example, a blast burner). One end 121 of the heat exchange pipe 120 is communicated with pipes (not shown) such as air and gas supplied to the gas burner, and when the gas burner is ignited, high-temperature combustion gas is generated by combustion of the gas. It is configured to occur. The combustion gas moves from one end 121 of the heat exchange pipe 120 to the other end 122, and finally from the opening 122a provided in the other end 122, the steam generator 100 (or the steam convection oven 1). ) Is discharged to the outside. Due to this movement of the combustion gas, the entire inner surface of the heat exchange pipe 120 that continuously extends from one end 121 to the other end 122 is heated to a high temperature by the combustion gas. If the inner surface of the heat exchange pipe 120 is heated, the outer surface of the pipe is also heated by heat conduction. Therefore, while heating the air near the outer surface of the pipe of the heat exchange pipe 120, the supply water is distributed to the outer surface of the pipe of the heat exchange pipe 120. By bringing the supply water into contact with the outer surface of the pipe heated to a high temperature, the supply water can be evaporated to generate steam.

The other end 122 of the heat exchange pipe 120 may be provided on the upper side or the lower side of the fan 110. Further, the combustion gas discharged from the other end 122 may be conveyed to the cooking chamber 50a in the oven chamber 50. Furthermore, in the heat exchange pipe 120, the portion configured to have an inner diameter larger than that of the other portions is not limited to one end 121 of the heat exchange pipe 120, and is provided at an arbitrary position in the heat exchange pipe 120. Can be done. As a result, the gas burner provided for heating the heat exchange pipe 120 can also be similarly arranged at an arbitrary position according to the shape of the heat exchange pipe 120. Furthermore, the heat source for heating the heat exchange pipe 120 is not limited to the gas burner, and an electric heater or a liquid fuel burner may be used, or these may be used in combination. Furthermore, a plurality of heat exchange pipes 120 may be used, or may be provided so as to cover about half of the circumference of the fan 110.

2-3. Configuration of Water Pipe 130 As shown in FIGS. 2 and 3, the water pipe 130 mainly includes a main pipe 131 and a nozzle portion 132. One end of the main pipe 131 may communicate with a water dispenser (not shown) such as a water storage tank provided on the upstream side or another predetermined supply path to which the supplied water is sent (removably fitted, etc.). (Including), and the supply water is configured to be distributed. Further, the other end of the main pipe 131 is connected to the nozzle portion 132, and the supply water distributed to the main pipe 131 is configured to be distributed from the nozzle portion 132 to the blade 112 in the fan 110. ing.

The main pipe 131 and the nozzle portion 132 may be formed into an integral structure by bending a metal pipe by performing a metal processing treatment (for example, a press treatment or the like) in the middle. However, it is preferable that the nozzle portion 132 is detachably provided with respect to the main pipe 131 so that the nozzle portion 132 can be efficiently and easily cleaned and cleaned. In this case, the nozzle portion 132 may be connected to the main pipe 131 by bolt fastening or a detachable predetermined fitting structure.

As shown in FIG. 5, the nozzle portion 132 is integrally or separately provided with the main pipe 131 having a predetermined obtuse angle X (degrees) (connected to the main pipe 131). .. As a result, the flow velocity of the supply water flowing on the main pipe 131 is suppressed, and the supply water is dripped widely (widely in the axial direction of the fan 110) on the blade 120 of the fan 110 described above. The magnitude of the obtuse angle X (degrees) described above is preferably in the range of 95 degrees to 115 degrees.

As shown in FIGS. 2 and 3, the main pipe 131 extends so as to hang down from above the steam generator 100, and is formed on a removable partition plate 70 that separates the cooking chamber 50a and the steam generating chamber 50b. It is preferable that it is provided so that it can be leaned against. Further, a protruding portion 133 as shown in FIG. 5 may be provided on the outer wall of the main pipe 131. As a result, the main pipe 131 is attached to the partition plate 70 by fitting the protrusion 133 into the first ventilation hole provided in the partition plate 70, or fixing the protrusion 133 to the partition plate 70 with a screw. It can be stably fixed and placed.

The nozzle portion 132 is formed by metal processing a metal pipe to be integrally formed with the main pipe 131 or separately from the main pipe 131 as described above. The nozzle portion 132 is provided with at least one sprinkler hole 135. The tip of the nozzle portion 132 is arranged at a position facing the blade 112 in the fan 110 in the vertical direction.

As shown in FIGS. 4 and 6, the sprinkler hole 135 is provided in the vicinity of the center portion of the nozzle portion 132 in the width direction (in FIG. 4, the left-right direction of the paper surface). The shape and inner diameter of the watering hole 135 are not particularly limited, but the flow velocity of the supply water distributed from the main pipe 131 may be at least large enough to allow the supply water to flow into the watering hole 135. .. For example, a substantially circular shape having a diameter of 5.0 to 5.4 can be used.

Further, at least one sprinkler hole 135 may be provided in the nozzle portion 132, but as shown in FIGS. 4 and 6, the flow of the supply water distributed to the main pipe 131 is divided into a plurality of water sprinkler holes 135. It is more preferable to provide two or more in order to make the water droplets of the supply water smaller. If the sprinkler hole 135 is simply provided, the supply water distributed into the sprinkler hole 135 does not drip directly downward from the sprinkler hole 135, but is based on the surface tension of the supply water, and the nozzle portion 132. It flows from the sprinkler hole 135 to the tip portion 132a of the nozzle portion 132, and finally drops on the lower blade 112 at the tip portion 132a. In such a case, since the droplets of the supply water are dropped on the blade 112 in a large state, the diffusion efficiency of the supply water deteriorates, and as a result, the droplets come into contact with the outer surface of the heat exchange pipe 120 of the supply water. The contact efficiency (and thus the evaporation efficiency) also deteriorates.

Therefore, as shown in FIGS. 4 to 6, the nozzle portion 132 is provided with at least one diffusion plate 137 so as to extend downward from the back surface thereof. As a result, the supply water distributed into the sprinkler hole 135 flows through the back surface of the nozzle 132 to the diffuser plate 137, and finally drops downward from the tip portion 137a of the diffuser plate 137. .. That is, the diffusion plate 137 prevents the supply water from being collected at the tip portion 132a of the nozzle portion 132, makes the water droplets of the supply water smaller, and then uses the supply water of the minute water droplets as a fan. It can be dropped onto the blade 112 at 110.

The shape of the diffusion plate 137 is preferably a substantially arc shape in which the tip portion 137a has a top portion downward, or a substantially polygonal shape such as a triangle, and the angle of the top portion is formed to be small. , Those having a sharp shape are more preferable.

Further, as shown in FIGS. 4 to 6, each diffusion plate 137 is preferably provided so as to correspond to each sprinkling hole 135, and is provided in the same number as the number of sprinkling holes 135. The diffuser plate 137 is provided at a position advanced downstream of the corresponding sprinkler hole 135 in the direction in which the supply water flows by a predetermined distance. Further, each diffusion plate 137 is arranged between the tip of the nozzle portion 132 and the sprinkler hole 135, and between two adjacent sprinkler holes 135, and at a position facing the blade 112 in the fan 110 in the vertical direction. Will be done. As a result, the supply water flowing along the back surface of the sprinkler hole 135 and the nozzle portion 132 can be reliably dropped onto the blade 112 with the water droplets in a fine state.

In FIGS. 4 to 6, the supply water distributed to the main pipe 131 by the three watering holes 135 and the three diffusion plates 137 provided so as to correspond to the three watering holes 135 is distributed to the main pipe 131 at three locations (or When the tip 132a of the nozzle 132 is also included, the water droplets are divided into four parts) and dropped onto the blade 112. It can be made very small, and as a result, the contact efficiency (evaporation efficiency) of contacting the outer surface of the heat exchange pipe 120 of the supply water can be increased.

By the way, the minute water droplets dropped from the nozzle portion 132 collide with the blade 112 of the rotating fan 110, are further refined and diffused, and come into contact with the outer surface of the heat exchange pipe 120 to form steam. It is desirable that the water droplets evenly contact (diffuse) the outer surface of the heat exchange pipe 120 in order to further increase the evaporation efficiency of the heat exchange pipe 120. Therefore, it is preferable that the tip portion 132a of the nozzle portion 132 is arranged near the rotation center of the fan 110 and at a position facing the shaft portion 113.

2-4. Supply route to the water distribution pipe 130 of the supply water Next, the supply route of the supply water to the water distribution pipe 130 will be described with reference to FIG. 7.

As described above, the water distribution pipe 130 mainly includes the main pipe 131 and the nozzle portion 132, and one end of the main pipe 131 is a water dispenser (not shown) such as a water storage tank provided on the upstream side. In addition, it communicates with a predetermined supply path to which the supply water is sent (including the case where it is detachably fitted), and the supply water is configured to be distributed. Here, a first valve 300, a water softener 400, and a second valve 500 are provided on the supply path of the supply water. The first valve 300 is used, for example, to temporarily stop the supply of supply water when replacing the water softener 400.

The water softener 400 is provided to convert cations such as calcium ions and magnesium ions contained in the supply water derived from tap water into sodium ions by an ion exchange resin. As a result, the precipitation of deposits derived from inorganic substances such as calcium and magnesium is minimized on the nozzle portion 132 including the diffusion plate 137 and on the main pipe 131. However, since it is impossible to completely remove (convert to sodium ions) cations such as calcium ions and magnesium ions contained in the supplied water by the water softener, the diffusion plate 137, the nozzle portion 132, and the main pipe are used. It is preferable to clean 131 regularly.

The second valve 500 controls the supply amount of the supply water treated by the water softener 400 to the water distribution pipe 130. By controlling the valve opening amount of the second valve 500, the amount of water supplied to the water distribution pipe 130 is controlled, and the supply is dropped from the nozzle portion 132 (diffusion plate 137) onto the blade 112 in the fan 110. The amount of water can be controlled.

Although the embodiments of the present invention have been illustrated above, the above embodiments are merely examples and are not intended to limit the scope of the invention. The above-described embodiment can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. In addition, each configuration, shape, size, length, width, thickness, height, number, etc. can be appropriately changed for implementation. The arrangement and configuration of each part of the steam convection oven 1 and the steam generator 100 are not limited to the above-described embodiment.

1 Steam convection oven 10 Housing 20 Door 50 Oven oven 50a Cooking room 50b Steam generation room 70 Partition plate 100 Steam generator 110 Fan 112 Blade 120 Heat exchange pipe 130 Water distribution pipe 132 Nozzle part 132a Nozzle part tip 135 Sprinkler hole 137 Diffuse plate

Claims (4)

A fan placed in the oven and equipped with multiple blades,
A heat exchange pipe arranged around the fan,
A main pipe that communicates with the water supply source, and a water distribution pipe that is connected to the main pipe and has a nozzle portion for dropping supply water toward the blade.
Equipped with
The nozzle portion
Multiple watering holes with a substantially circular shape,
It is located only between the tip of the nozzle portion and the sprinkler hole arranged at the position closest to the tip among the plurality of sprinkler holes, and between two adjacent sprinkler holes, and in the vertical direction. A plurality of diffusion plates extending downward so as to face the blade and dropping the supply water in the vertical direction toward the blade.
Steam convection oven, characterized in that to have a. The destination end, the a position facing the center of rotation near the fan, and in the vertical direction is arranged at a position opposed to the blades, steam convection oven according to claim 1. The steam convection oven according to claim 1 or 2 , wherein the nozzle portion is detachably provided with respect to the water pipe. With a fan with multiple blades,
A heat exchange pipe arranged around the fan,
A main pipe that communicates with the water supply source, and a water distribution pipe that is connected to the main pipe and has a nozzle portion for dropping supply water toward the blade.
Equipped with
The nozzle portion
Multiple watering holes with a substantially circular shape,
It is located only between the tip of the nozzle portion and the sprinkler hole arranged at the position closest to the tip among the plurality of sprinkler holes, and between two adjacent sprinkler holes, and in the vertical direction. A plurality of diffusion plates extending downward so as to face the blade and dropping the supply water in the vertical direction toward the blade.
Steam generating device, characterized in that the have a.

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