JP2008292010A - Fluid temperature rising device and heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker capable of being miniaturized and reducing power consumption. <P>SOLUTION: In this heating cooker 1 comprising a heating chamber 2 receiving an object W to be heated, a steam generating device 3 generating the steam for heating the object W, and a fluid temperature rising device 10 for rising a temperature of the steam generated by the steam generating device 3 by heat exchange with a heating element 12, and heating and cooking the object W by supplying the steam of which the temperature is risen by the fluid temperature rising device 10 into the heating chamber 2, an air blower 6 is disposed to guide the steam in the heating chamber 2 to the fluid temperature rising device 10 and circulating the steam, the fluid temperature rising device 10 has a first fluid passage 15 for circulating the steam generated by the steam generating device 3, and a second fluid passage 16 for circulating the steam flowing out from the heating chamber 2, and pressure loss of the second fluid passage 16 is smaller than that of the first fluid passage 15. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooking device that cooks an object to be heated with steam. The present invention also relates to a fluid temperature raising device that raises the temperature of a fluid such as steam by electromagnetic induction heating.

  A conventional cooking device is disclosed in Patent Document 1. FIG. 5 is a side sectional view showing the cooking device. A cooking device 1 having a heating chamber 2 includes a steam generator 3 that generates steam and a fluid temperature increasing device 10 that raises the temperature of the steam. The steam generator 3 is filled with an adsorbent 7 having water absorption in a cylindrical outer cylinder 11. The adsorbent 7 is mixed with iron powder, and the iron powder generates heat by electromagnetic induction when the coil 8 wound around the outer cylinder 11 is energized. Thereby, the water contained in the adsorbent 7 is evaporated to generate steam.

  The fluid temperature raising device 10 has a honeycomb-shaped heating element 12 in an outer cylinder 11 common to the steam generator 3, and the heating element 12 generates heat by electromagnetic induction of a coil 13 wound around the outer cylinder 11. . The steam generated by the steam generator 3 is heated by exchanging heat with the heating element 12 by the fluid temperature raising device 10 and is sent to the heating chamber 2 as superheated steam. Thereby, the to-be-heated object W in the heating chamber 2 is cooked.

  The heating chamber 2 and the steam generator 3 are communicated by a duct 5, and a blower 6 that guides the steam in the heating chamber 2 to the steam generator 3 through the duct 5 is provided. By driving the blower 6, the steam in the heating chamber 2 passes through the steam generator 3, and the temperature of the steam is increased through the fluid temperature increasing device 10 together with the steam generated in the steam generator 3. Thereby, the temperature in the heating chamber 2 can be circulated to raise the temperature, and the heating efficiency of cooking can be improved.

Japanese Patent No. 2792432 (pages 4-7, FIG. 2)

  However, according to the above-described conventional cooking device, the fluid temperature raising device 10 forms the heating element 12 in a honeycomb shape so as to sufficiently raise the temperature of the steam generated by the steam generating device 3 to ensure a wide heat exchange area. Yes. For this reason, an elongate passage is formed in the heat generating body 12, and the pressure loss of the fluid temperature rising apparatus 10 becomes large. Since the steam that flows out from the heating chamber 2 and circulates also passes through the fluid temperature raising device 10 having a large pressure loss, a large blower 6 is required. Therefore, there existed a problem which the enlargement of the heating cooker 2 and power consumption became large.

  An object of this invention is to provide the fluid temperature rising apparatus and heating cooker which can reduce size reduction and electric power consumption.

  In order to achieve the above object, the present invention provides a heating chamber for storing an object to be heated, a steam generator for generating steam for heating the object to be heated, and heat generated by the steam generator with heat generated by a heating element. A heating device that heats the object to be heated by supplying the steam heated by the fluid heating device to the heating chamber. In addition to providing a blower that guides the fluid to the fluid temperature raising device and circulates the steam, the fluid temperature raising device has a first fluid passage through which the steam generated by the steam generator circulates and a first fluid passage through which the steam flowing out of the heating chamber circulates. And the second fluid passage has a pressure loss smaller than that of the first fluid passage.

  According to this configuration, the steam generated by the steam generator circulates through the first fluid passage of the fluid temperature raising device. The first fluid passage has a large pressure loss, and superheated steam is generated by exchanging heat with the heating element while the steam passes through the first fluid passage at low speed due to the vapor pressure. The superheated steam that has passed through the first fluid passage flows into the heating chamber, and heats the object to be heated. The steam in the heating chamber flows through the second fluid passage of the fluid temperature raising device by driving the blower. The second fluid passage has a pressure loss smaller than that of the first fluid passage, and steam passes through the second fluid passage at a high speed. The steam flowing through the second fluid passage is heated to a desired temperature by heat exchange with the heating element and sent to the heating chamber. A heating element may be provided in the first fluid path, the second fluid path may be adjacent to the first fluid path, and the heating element may be provided in the first and second fluid paths.

  According to the present invention, in the cooking device configured as described above, the heating element forms a wall surface of the first fluid passage and forms a plurality of passages or bent passages in the first fluid passage, and the second fluid passage is the It is characterized by being adjacent to the first fluid passage through the wall surface.

  According to this configuration, the heating element forms a plurality of passages such as a honeycomb shape or a lattice shape or a curved passage such as an S shape or a spiral shape in the first fluid passage, and a large heat exchange area with the steam is secured. The The steam flowing through the first fluid passages exchanges heat with the heating element through these passages. The steam flowing through the second fluid passage adjacent to the first fluid passage exchanges heat with the wall surface of the first fluid passage made of the heating element.

  Moreover, this invention is a cooking-by-heating apparatus of the said structure, The said fluid temperature rising apparatus forms the 2nd fluid path around the said inner cylinder and the inner cylinder which forms a 1st fluid path around the said inner cylinder. An outer cylinder and a coil wound around the outer cylinder are provided, and the heating element is heated by electromagnetic induction by applying a high-frequency voltage to the coil.

  According to this configuration, when the coil is energized, the heating element is heated by electromagnetic induction, and the steam generated by the steam generator flows through the first fluid passage in the inner cylinder and exchanges heat with the heating element. Further, the steam flowing in from the heating chamber flows through the second fluid passage between the inner cylinder and the outer cylinder and exchanges heat with the heating element. A heating element may be provided in the inner cylinder and between the outer cylinder and the inner cylinder. The inner cylinder is formed by the heating element, and the temperature of the steam flowing through the second fluid passage is increased by heat exchange with the inner cylinder. Also good.

  Further, the present invention is characterized in that, in the cooking device configured as described above, the inner cylinder is formed of the heating element, and heat exchange fins protruding into the second fluid passage are provided on a peripheral surface of the inner cylinder. . According to this structure, the vapor | steam which distribute | circulates between an outer cylinder and an inner cylinder heats up with the wall surface and heat exchange fin of an inner cylinder, and is heated up.

  Moreover, the present invention is characterized in that in the heating cooker having the above configuration, a heat insulating means is provided between the outer cylinder and the coil. According to this configuration, the temperature rise of the coil is prevented by the heat insulating means, and the temperature rise of the coil is prevented by the steam flowing at high speed between the outer cylinder and the inner cylinder.

  The present invention also includes an outer cylinder through which a fluid flows, a coil wound around the outer cylinder, an inner cylinder that is disposed in the outer cylinder and that is electromagnetically heated by applying a high-frequency voltage to the coil. A fluid temperature increasing device for increasing the temperature of fluid flowing in the outer cylinder and the inner cylinder, wherein the pressure loss between the inner cylinder and the outer cylinder is less than the pressure loss in the inner cylinder. Is also small.

  According to this configuration, when the coil is energized, the inner cylinder is heated by electromagnetic induction. The inner cylinder has a large pressure loss, and the fluid passes through at a low speed and is heated. The pressure loss between the inner cylinder and the outer cylinder is smaller than that in the inner cylinder, so that the fluid passes at a high speed and exchanges heat with the wall surface of the inner cylinder to raise the temperature.

  According to the present invention, in the fluid temperature raising apparatus configured as described above, the inner cylinder has a plurality of passages or bent passages therein.

  According to the present invention, since the pressure loss of the second fluid passage through which the steam flowing out from the heating chamber flows is smaller than the pressure loss of the first fluid passage through which the steam generated in the steam generator flows, the pressure loss occurred in the steam generator. The steam can be heated to a predetermined temperature while passing through the first fluid passage through heat exchange with the heating element at a low speed. Moreover, since the high-temperature steam that has flowed out of the heating chamber passes through the second fluid passage with a small pressure loss and is heated, the blower that guides the steam to the second fluid passage can be downsized. Accordingly, it is possible to reduce the size of the heating cooker and reduce power consumption.

  According to the invention, the heating element forms the wall surface of the first fluid passage to form a plurality of passages or bent passages in the first fluid passage, and the second fluid passage is adjacent to the first fluid passage. Steam generated by the steam generator can be easily heated to a predetermined temperature by increasing the heat exchange area of the first fluid passage. Further, the temperature of the steam flowing through the second fluid passage can be raised by the wall surface of the first fluid passage, and the pressure loss of the second fluid passage can be easily reduced.

  According to the present invention, the first and second fluid passages can be easily formed by the inner cylinder and the outer cylinder, and the heating element can be easily heated by electromagnetic induction of the coil wound around the outer cylinder. Can do. Further, since the steam flows between the inner cylinder and the outer cylinder at a high speed, the outer cylinder is cooled, and damage to the coating due to overheating of the coil can be prevented. In addition, when the inner cylinder is formed by the heating element, the steam flowing between the inner cylinder and the outer cylinder is heated by the inner cylinder, and the pressure loss of the second fluid passage can be easily reduced.

  According to the present invention, since the heat exchange fin protruding into the second fluid passage is provided on the peripheral surface of the inner cylinder made of the heating element, the heat exchange area of the second fluid passage is increased to flow out of the heating chamber. Steam can be easily heated to a predetermined temperature.

  Further, according to the present invention, since the heat insulating means is provided between the outer cylinder and the coil, the steam flows through the inner cylinder and the outer cylinder at high speed, and the outer cylinder is cooled, so that the thickness of the heat insulating means is increased. It is possible to reduce the size of the fluid temperature raising device by reducing the thickness.

  Further, according to the fluid temperature raising apparatus of the present invention, the pressure loss between the outer cylinder and the inner cylinder made of the heating element is smaller than the pressure loss in the inner cylinder, so that the fluid flowing through the inner cylinder is low speed The fluid can be heated to a predetermined temperature by exchanging heat with. Further, the temperature of the fluid flowing through the inner cylinder and the outer cylinder with a small pressure loss is raised by the wall surface of the inner cylinder, and the pressure loss between the inner cylinder and the outer cylinder can be easily reduced. Thereby, size reduction of the air blower which guides the fluid between an inner cylinder and an outer cylinder can be achieved. In addition, since the fluid flows between the inner cylinder and the outer cylinder at a high speed, the outer cylinder is cooled, and damage to the coating due to overheating of the coil can be prevented.

  Further, according to the fluid temperature increasing device of the present invention, the inner cylinder has a plurality of passages or bent passages inside, so that the heat exchange area in the inner cylinder is increased and the fluid flowing through the inner cylinder can be easily heated to a predetermined temperature. Can be heated.

  Embodiments of the present invention will be described below with reference to the drawings. For convenience of explanation, the same reference numerals are assigned to the same parts as those in the conventional example shown in FIG. Drawing 1 is a side sectional view showing the cooking-by-heating machine of one embodiment. The heating cooker 1 cooks an object to be heated with a heating medium made of superheated steam. The heating cooker 1 has a heating chamber 2 in which the article to be heated W is accommodated, and includes a steam generator 3 that generates steam and a fluid temperature increasing device 10 that raises the steam.

  The steam generator 3 has a heater 9 immersed in water supplied from a water tank (not shown), and generates steam when the heater 9 is energized. In the fluid temperature raising device 10, a coil 13 is wound around an outer cylinder 11 made of an insulator via a heat insulating material 19 (see FIG. 2). A ferromagnetic material 17 such as ferrite is provided outside the coil 13.

  FIG. 2 is a plan view showing the inside of the outer cylinder 11. A heating element 12 made of a magnetic conductor is disposed in the outer cylinder 11. The heating element 12 has a plurality of flat plate heat exchange plates 12a arranged in parallel with a predetermined interval, and a cylindrical inner tube 14 that covers the outside of the heat exchange plate 12a. As a result, the fluid temperature raising device 10 is formed with a first fluid passage 15 composed of the inner cylinder 14 and a second fluid passage 16 composed between the inner cylinder 14 and the outer cylinder 11. A plurality of passages are further formed in the first fluid passage 15 by the heat exchange plate 12a. Further, a heat exchange fin 18 protruding into the second fluid passage 16 is provided on the peripheral surface of the inner cylinder 14.

  When a high frequency voltage is applied to the coil 13, a magnetic field is generated. The magnetic flux passing outside the coil 13 passes through the ferromagnetic material 17, and leakage of the magnetic field is prevented. The magnetic flux passing through the inside of the coil 13 passes through the heating element 12 made of a magnetic material. As a result, an induction current flows through the heating element 12 to generate an eddy current therein, and heat is generated by Joule heat. Moreover, since the heat generating body 12 consists of magnetic bodies, it is heated also by hysteresis loss.

  In FIG. 1, the steam generator 3 is connected to one end of the first fluid passage 15 of the fluid temperature raising device 10 by a duct 21. A blower 6 is arranged in the lower part of the heating chamber 2 and a duct 22 is led out. The heating chamber 2 and one end of the second fluid passage 16 are connected by the duct 22, and the steam in the heating chamber 2 is guided to the second fluid passage 16 by driving the blower 6. The other ends of the first and second fluid passages 15 and 16 are integrally connected to the top surface of the heating chamber 2 by a duct 23.

  In the heating cooker 1 configured as described above, a water tank (not shown) is mounted in a full state, and the article to be heated W is arranged in the heating chamber 2. When cooking is started by selecting the cooking menu, water is supplied from the water tank to the steam generator 3. When the heater 9 is energized, the water in the steam generator 3 evaporates and steam is generated.

  The steam generated by the steam generator 3 flows through the first fluid passage 15 in the inner cylinder 14 of the fluid temperature raising device 10 by the steam pressure through the duct 22 and exchanges heat with the heating element 12. In the inner cylinder 14, a plurality of passages are formed by the heat exchange plates 12 a arranged side by side through a gap, and a large heat exchange area is secured.

  For this reason, the first fluid passage 15 has a large pressure loss, and the steam exchanges heat with the heating element 12 while passing through the first fluid passage 15 at a low speed due to the vapor pressure, and overheats at a predetermined temperature (150 ° C. to 300 ° C.). Steam is generated. The steam heated through the first fluid passage 15 flows into the heating chamber 2 through the duct 23.

  Although the heating element 12 in the inner cylinder 14 is formed by arranging flat plate-like heat exchange plates 12a in parallel, corrugated plate-like heat exchange plates may be arranged in parallel, or the heat exchange plates may be provided radially. Further, the heat generating body 12 may be formed in a lattice shape or a honeycomb shape, and a plurality of passages may be formed in the inner cylinder 14 to widen the heat exchange area of the heat generating body 11.

  Further, a bent passage may be formed in the inner cylinder 14 by the heating element 12 to widen the heat exchange area. For example, as shown in FIG. 3, the bent passage is formed by providing a plurality of partition plates 30 that cross the axis of the inner cylinder 14. Through holes 30a can be provided at different positions when viewed from the axial direction of each partition plate 30, and a passage bent into an S shape can be formed. A number of through holes 30 a may be provided in each partition plate 30.

  Further, as shown in FIG. 4, a spiral partition plate 31 may be provided in the inner cylinder 14 to form a spirally bent passage. Further, the inner cylinder 14 may be filled with metal wool or metal particles to form a plurality of passages or bent passages.

  By driving the blower 6, the steam in the heating chamber 2 flows through the second fluid passage 16 of the fluid temperature raising device 10 through the duct 22. And it sends out into the heating chamber 2 via the duct 23, and the vapor | steam in the heating chamber 2 circulates. The steam flowing through the second fluid passage 16 is heated by exchanging heat with the wall surface of the inner cylinder 14 and the heat exchange fins 18.

  Since the heat exchange fins 18 are arranged at a wide interval in the second fluid passage 16, the heat exchange area is narrower than that of the first fluid passage 15 and the pressure loss is small. For this reason, the steam passes through the second fluid passage 16 at a high speed. Since the steam flowing through the second fluid passage 16 flows out of the heating chamber 2, the temperature is high. For this reason, even if the pressure loss of the second fluid passage 16 is small and the steam passes at a high speed, the temperature of the steam can be increased to a predetermined temperature.

  Further, since the heat exchange area of the second fluid passage 16 is increased by the heat exchange fins 18, it is possible to easily raise the temperature of the steam flowing out of the heating chamber 2 to a predetermined temperature. The steam whose temperature is increased through the second fluid passage 16 flows into the heating chamber 2 through the duct 23 together with the steam that has passed through the first fluid passage 15. Thereby, the article W to be heated is cooked.

  According to this embodiment, the pressure loss of the second fluid passage 16 through which the steam flowing out from the heating chamber 2 flows is smaller than the pressure loss of the first fluid passage 15 through which the steam generated in the steam generator 3 flows. The steam generated in the generator 3 can be sufficiently heated to a predetermined temperature while passing through the first fluid passage 15 by exchanging heat with the heating element 12 at a low speed. Moreover, since the high temperature steam that has flowed out of the heating chamber 2 passes through the second fluid passage 16 having a small pressure loss and is heated, the blower 6 that guides the steam to the second fluid passage 16 can be downsized. Therefore, it is possible to reduce the size of the heating cooker 1 and reduce power consumption.

  Further, the heating element 12 forms a wall surface of the first fluid passage 15 by the inner cylinder 14 to form a plurality of passages or bent passages in the first fluid passage 15, and the second fluid passage 16 is the first fluid passage 15. Since the heat exchange area of the first fluid passage 15 is increased, the steam generated by the steam generator 3 can be easily heated to a predetermined temperature. Further, since the temperature of the steam flowing through the second fluid passage 16 is raised by the wall surface of the first fluid passage 15, the pressure loss of the second fluid passage 16 can be easily reduced.

  Further, since the steam flows between the inner cylinder 14 and the outer cylinder 11 at a high speed, the outer cylinder 11 is cooled, and damage to the coating due to overheating of the coil 13 can be prevented. In addition, the thickness of the heat insulating material 19 between the outer cylinder 11 and the coil 13 can be reduced, and the fluid temperature raising device 10 can be downsized. The heat insulating means made of the heat insulating material 19 may be a heat insulating means using an air layer. In the case where the heat insulating property by the heat insulating means is high, the outer cylinder 11 may be formed by a heating element that generates heat by electromagnetic induction of the coil 13.

  In the present embodiment, the first and second fluid passages 15 and 16 are formed by the outer cylinder 11 and the inner cylinder 14, but may be formed by other configurations. That is, it is only necessary to have the first fluid passage 15 through which the steam from the steam generating device 3 flows and the second fluid passage 16 through which the steam from the heating chamber 2 flows. At this time, the temperature of the steam is raised by the heating elements provided in the first and second fluid passages 15 and 16, respectively.

  However, the first and second fluid passages 15 and 16 adjacent to each other by the outer cylinder 11 and the inner cylinder 14 can be easily formed. For this reason, when the inner cylinder 14 is formed of the heating element 12, the second fluid passage 16 having a small pressure loss can be easily formed.

  Further, the steam generator 3 may be configured to generate steam by electromagnetic induction of a coil. At this time, the steam generator 3 may be integrated with the fluid temperature raising device 10, and water may be supplied into the inner cylinder 14 to generate steam by electromagnetic induction of the coil 13.

  INDUSTRIAL APPLICABILITY The present invention can be used in a cooking device that cooks an object to be heated with steam.

Side surface sectional drawing which shows the heating cooker of embodiment of this invention The top view which shows the fluid temperature rising apparatus of the heating cooker of embodiment of this invention The side view which shows the other heat generating body of the heating cooker of embodiment of this invention The side view which shows the other heat generating body of the heating cooker of embodiment of this invention Side surface sectional drawing which shows the heating cooker of conventional embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating cooker 2 Heating chamber 3 Steam generator 6 Blower 9 Heater 10 Fluid temperature raising device 11 Outer cylinder 12 Heating element 12a Heat exchange plate 13 Coil 14 Inner cylinder 15 First fluid path 16 Second fluid path 17 Ferromagnetic material 18 Fin 19 for heat exchange Heat insulation 21-24 Duct W Object to be heated

Claims (7)

  A heating chamber for storing an object to be heated; a steam generator for generating steam for heating the object to be heated; and a fluid temperature increasing device for heating the steam generated by the steam generator by heat exchange with a heating element. A heating cooker for heating and cooking the object to be heated by supplying the steam heated by the fluid heating device into the heating chamber, and circulating the steam by guiding the steam in the heating chamber to the fluid heating device The fluid temperature raising device includes a first fluid passage through which the steam generated by the steam generator flows, and a second fluid passage through which the steam flowing out of the heating chamber flows, and the second fluid A heating cooker characterized in that the pressure loss of the passage is smaller than the pressure loss of the first fluid passage.   The heating element forms a wall surface of the first fluid passage and forms a plurality of passages or bent passages in the first fluid passage, and the second fluid passage is adjacent to the first fluid passage through the wall surface. The cooking device according to claim 1, wherein the cooking device is a cooking device.   The fluid temperature raising device is wound around an inner cylinder forming a first fluid passage, an outer cylinder surrounding the inner cylinder and forming a second fluid passage around the inner cylinder, and outside the outer cylinder. The heating cooker according to claim 1, wherein the heating element is heated by electromagnetic induction by applying a high frequency voltage to the coil.   The heating cooker according to claim 3, wherein the inner cylinder is made of the heat generating element, and heat exchange fins protruding into the second fluid passage are provided on a peripheral surface of the inner cylinder.   The heating cooker according to claim 3 or 4, wherein a heat insulating means is provided between the outer cylinder and the coil.   An outer cylinder through which a fluid circulates, a coil wound around the outer cylinder, and an inner cylinder arranged in the outer cylinder and electromagnetically heated by applying a high frequency voltage to the coil, In the fluid temperature raising device for raising the temperature of the fluid flowing in the outer cylinder and the inner cylinder, the pressure loss between the inner cylinder and the outer cylinder is smaller than the pressure loss in the inner cylinder. A fluid temperature raising device.   The fluid temperature increasing device according to claim 6, wherein the inner cylinder has a plurality of passages or bent passages therein.

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