JP2011234765A - Rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rice cooker which is not enlarged in size, reduces heat leakage from work coils or the like, and uses a heat insulating material made of a resin foam member in conformity to regulations.SOLUTION: The rice cooker includes a body case and a lid body positioned above the body case. The body case has: an internal case; an inner pot stored in the internal case; and the work coils for heating the inner pot. A heat insulating material made of a resin foam member and a fire-retardant resin member is positioned between the body case and the internal case where the fire-retardant resin member is positioned on the side of the work coils.

Description

  The present invention relates to a rice cooker in which a heat insulating material that conforms to laws and regulations is provided outside the inner case.

  2. Description of the Related Art Generally, rice cookers are widely known as appliances that have heating means such as a work coil and a heat retaining heater, and automatically cook rice and heat by controlling these heating means to provide optimal rice to the user.

  And the rice cooker which provides a heat insulating material between a main body case and an inner case in order to perform rice cooking and heat insulation appropriately, and what reduces heat escape is known. Conventionally, glass wool has been widely used as a heat insulating material. However, glass wool insulation does not retain shape, so it takes time to install, and material costs are high.Furthermore, fiber fragments are scattered and the working environment is deteriorated. It was.

  In order to eliminate these adverse effects, the present applicant has proposed a heat insulating material for a foamed resin member of a foamed plastic molding. The heat insulating material of the foamed resin member is a foamed plastic molded body, which is divided into two parts 1 and 1 ′ in the left-right direction. As shown in FIG. 12, in the space 4 between the main body case 2 and the inner case 3. It is provided in the form of standing up and down, and prevents the heat of the heating means such as the work coil 5 from escaping to the outside (for example, see Patent Document 1).

  Since the heat insulating materials 1 and 1 'of the foamed resin member have shape retaining properties, they can be molded in accordance with a predetermined space, can be easily attached, and the material cost is low, and the volume is small. It is lightweight and has the advantage that the working environment is improved because the fiber pieces do not scatter.

  By the way, when a rice cooker or the like is provided with a heat insulating material or a heat insulating material in the vicinity of an electrical component (work coil, heat insulating heater, control board, etc.) according to the Electrical Appliance and Material Safety Law, a flame retardant material or a heat insulating material or When the heat insulating material is not flame retardant, it is defined to be provided 50 mm away from the electrical component. In general, the heat retaining heater is covered with flame retardant aluminum, and the control board is held by the flame retardant holding member, so there is no problem, but the work coil is treated as a bare wire and heated. Since the temperature sometimes rises to near 100 ° C., it is an electrical component requiring special attention.

  The above conventional one eliminates such a harmful effect and prevents the abnormal temperature rise of the work coil 5 itself, as shown in FIG. 12, in the vertical direction of the heat insulating materials 1, 1 ′ of the foamed resin member. Is made linear so that the work coil 5 is not covered.

  However, since the heat insulating material of the foamed resin member is not flame retardant, it is necessary to provide a gap of 50 mm or more between the heat insulating material of the foamed resin member and the work coil. Therefore, the said conventional thing has the problem that the range which provides the heat insulating material of a foaming resin member is restrict | limited, or an outer case must be enlarged, and a rice cooker will enlarge.

  Moreover, since the conventional thing does not cover the work coil 5 with the heat insulating materials 1 and 1 ', it also has a problem that the heat of the work coil 5, or the inner case or the inner pot easily escapes to the outside. .

JP 2009-219677 A

  The purpose of the present invention is to reduce the escape of heat from the inner case or the inner pot without increasing the size of the rice cooker, and to use a heat insulating material of a foamed resin member that conforms to legal regulations. Is to provide.

  In order to achieve the above object, the present invention adopts the following configuration.

  In the invention which concerns on Claim 1, It is a rice cooker which has a main body case and the cover body of the said main body case, Comprising: In the said main body case, the inner case and the inner pot accommodated in the said inner case, And a work coil for heating the inner pot, and a heat insulating material comprising a foamed resin member and a flame retardant resin member between the body case and the inner case, the flame retardant resin member Is arranged to be positioned on the work coil side.

  In the invention according to claim 2, in addition to the structure of the invention of claim 1, the heat insulating material covers at least a part of the work coil.

  In the invention which concerns on Claim 3, in addition to the structure of Claim 1, 2, the structure which has the clearance gap through which cooling air flows between the said heat insulating material and the said work coil.

  In the invention according to claim 4, in addition to the structure of the invention of claims 1 to 3, the foamed resin member and the flame retardant resin member are superposed and integrated.

  And by these structures, it becomes possible to form a heat insulating material that conforms to the legal regulations in a size that matches the gap formed between the main body case and the inner case, and enlarges the main body case. Good insulation of the inner case or the inner pot is possible.

  The invention according to claim 1 is a method in which a heat insulating material composed of a foamed resin member and a flame retardant resin member is disposed between the main body case and the inner case on the work coil side. The heat insulating material can be brought close to the work coil in a state that complies with the regulations, and as a result, good heat insulation of the inner case or the inner pot can be performed without enlarging the main body case.

  In the invention according to claim 2, by covering at least a part of the work coil with the heat insulating material, in addition to the effect of the invention of claim 1, the heat insulation of the inner case or the inner pot can be further improved, The effect and the energy saving effect can be further improved.

  The invention according to claim 3 can prevent overheating of the work coil in addition to the effects of the inventions of claims 1 and 2 by providing a gap through which cooling air flows between the heat insulating material and the work coil. .

  According to a fourth aspect of the present invention, the foamed resin member and the flame retardant resin member are overlapped and integrated, so that in addition to the effects of the first to third aspects, the heat insulating material can be easily assembled. The production cost can be reduced.

Left and right central longitudinal section of rice cooker Front and rear center vertical cross section of rice cooker Bottom view with bottom member removed The perspective view which looked at the state which removed the outer case and the bottom member from diagonally downward of the front side The perspective view which looked at the flame-retardant resin member of the right side from the slanting lower part on the back side from the inside to the outside The perspective view which looked at the right side foamed resin member from the same direction as FIG. The perspective view which looked at the right heat insulation unit which fitted the right side foam resin member to the right flame retardant resin member from the same direction as FIG. The perspective view which looked at the flame-retardant resin member of the left side from the slanting lower part on the back side slightly from the outside toward the inside The perspective view which looked at the left foam resin member from the same direction as FIG. The perspective view which looked at the left heat insulation unit which fitted the left foam resin member to the left flame-retardant resin member from the same direction as FIG. Top view of the left side insulation unit and the right side insulation unit Horizontal cross-sectional view of the conventional rice cooker

  1 shows a horizontal center vertical cross-sectional view of the rice cooker, FIG. 2 shows a front-rear central vertical cross-sectional view of the rice cooker, FIG. 3 shows a bottom view with the bottom member removed, and FIGS. Fig. 2 shows a perspective view of the foamed resin member and the flame-retardant resin member. In addition, let the hinge unit 37 side of the rice cooker 10 be back, let the opposite side of the hinge unit 37 be the front, and let the side orthogonal to the front-back direction be the left-right direction.

  The whole rice cooker 10 is shown in FIG. The rice cooker 10 includes a main body case 11 and a lid 30. The main body case 11 is a part that forms the outline of the rice cooker 10, and includes an outer case 12, a bottom member 13, and a shoulder member 14.

  The outer case 12 is a cylindrical member made of a steel plate or a synthetic resin that forms a side portion of the rice cooker 10, and the bottom member 13 is a plate-shaped member made of a synthetic resin that forms the bottom portion of the rice cooker 10. The shoulder member 14 is a substantially ring-shaped member made of synthetic resin that forms the shoulder portion of the rice cooker 10. The outer case 12 and the bottom member 13 are joined by forcibly fitting the lower end portion of the outer case 12 to the outer peripheral upper end portion of the bottom member 13, and the outer case 12 and the shoulder member 14 are connected to the lower end of the outer periphery of the shoulder member 14. The upper end portion of the outer case 12 is forcibly fitted to the portion.

  An inner case 15 is provided in the outer case 12. The inner case 15 is made of plastic, and a bottom wall portion 15a, a curved wall portion 15b, a side wall portion 15c, and an outward flange 15d are integrally molded from the lower side. The inner case 15 is fixed to the bottom member 13 with a plurality of screws (not shown).

  An inner pot 16 is housed in the inner case 15, and an inner and outer portion made up of a bottom work coil 17 and a side work coil 18, which are electromagnetic induction heating coils for heating the inner pot 16, is provided on the lower surface of the inner case 15. Two sets of work coils are attached to the outer surfaces of the bottom wall portion 15 a and the curved wall portion 15 b of the inner case 15.

  A synthetic resin coil support base 22 and four ferrite cores 22a are provided outside the bottom work coil 17 and the side work coil 18, and the coil support base 22 is attached to the inner case 15 with screws. Thus, the bottom work coil 17 and the side work coil 18 are positioned and fixed at predetermined positions.

  Although not shown, a plurality of ribs are provided radially at the bottom of the inner case 15, and when the bottom work coil 17 and the side work coil 18 are attached, a gap with a rib height between the inner case 15 and the inner case 15 is provided. The cooling air flows through this gap to prevent overheating of the bottom work coil 17 and the side work coil 18. However, this gap may not be present.

  A heat retaining heater 19 is attached to the outer surface of the side wall portion 15 c of the inner case 15. The heat retaining heater 19 is covered with an aluminum foil, and a heat-resistant glass wool heat insulating material 20 is wound around the entire periphery of the heat insulating heater 19. The heat insulating material 20 prevents heat from the heat retaining heater 19 from escaping to the outside together with a heat insulating unit 60 including a foamed resin member 40 and a flame retardant resin member 50 described later.

  A temperature sensor 21 that detects the temperature of the inner pot 16 is provided at the center of the bottom wall portion 15 a of the inner case 15.

  The inner pot 16 is stored in the inner case 15 so as to be freely put in and out. The inner pot 16 is made of a metal that can be induction-heated by the bottom work coil 17 and the side work coil 18. In addition, when employ | adopting a clay pot as the inner pot 16, an induction heating body is affixed or apply | coated to the part which faces the said bottom part work coil 17 and the side part work coil 18 of the outer surface of this clay pot.

  As shown in FIGS. 2 and 3, in the space S in the rice cooker 10, the control board 24 supported by the board holding member 23 at the front side position and the cord reel 25 at the rear side position are vertically oriented. It is installed at. On the control board 24, electric parts such as a microcomputer and a power supply circuit for controlling heating means including the bottom work coil 17, the side work coil 18, the heat retaining heater 19 and the like are mounted. By the way, since some of the electrical components generate heat, a cooling fin 26 for cooling the heating elements and the like and a cooling fan 27 for radiating the heat of the cooling fin 26 are provided below the control board 24. Yes.

  In addition, a locking mechanism 28 is provided on the front side of the outer case 12, and when the locking mechanism 28 is pressed, the engagement with the locking portion is released and the lid 30 is opened. The front side is the left side in FIGS. 2 and 3, and the rear side is the right side in FIG.

  The lid 30 has an outer lid 31 and an inner lid 32 that opens and closes the opening edge of the inner pot 16 on the lower surface of the outer lid 31. A steam passage 34 in which a pressure regulating valve 33 is provided is formed in the outer lid 31, and excess steam is discharged from the discharge port 35. Further, a heat insulating material 36 for heat insulation is accommodated in the outer lid 31.

  The lid 30 is pivotally supported by the hinge unit 37 at the upper rear side of the rice cooker 10, and is opened when the lock mechanism 28 is released.

  In the space S between the outer case 12 and the inner case 15, a heat insulating unit 60 is provided which is formed by forming a heat insulating material as a whole by integrating the foamed resin member 40 and the flame retardant resin member 50. The foamed resin member 40 and the flame-retardant resin member 50 are divided into a right-side foamed resin member 40a and a left-sided foamed resin member 40b that are divided into left and right parts, a right-side flame-retardant resin member 50a and a left-side flame-retardant resin member 50b, respectively. The right side foam resin member 40a and the right side flame retardant resin member 50a are overlapped and integrated to form the right side heat insulation unit 60a. The left side foam resin member 40b and the left side flame retardant resin member 50b are The left heat insulating unit 60b is formed by being overlapped and integrated.

  The foamed resin member 40 is a heat insulating material of a foamed plastic molded product, and is formed by foaming and molding a plastic material such as PS (polystyrene), PP (polypropylene), PE (polyethylene), etc. into a predetermined shape. And has a certain degree of compressive strength. As shown in FIGS. 1 and 6, the foamed resin member 40 projects to the bottom of the inner case 15 until the lower surface 42 covers the side work coil 18, and the inner surface of the foamed resin member 40 is along the outer surface of the inner case 15. The outer surface of the outer case 12 is formed in a curved shape that is substantially the same shape as the inner surface of the outer case 12.

  FIG. 6 shows a perspective view of the right side foamed resin member 40a as viewed from an obliquely lower side toward the outside from the inside to the outside. The right side foam resin member 40a has a substantially arc shape in plan view, and the length of the arc surface is shorter than the semicircular circumference of the inner case 15, and is the side surface connecting the upper surface 41, the lower surface 42, and the upper surface 41 and the lower surface 42. It has an outer side surface 43 and an inner side surface 44. And the upper surface 41 and the lower surface 42 are made into the horizontal surface, and the concave fitting part 45 for the right and left bearing plates 14a and 14a provided in the shoulder member 14 to fit in is formed in the upper surface 41.

  The outer surface 43 is a surface facing the inner surface of the outer case 12 and has a substantially arc shape substantially the same as that shown in FIG. The inner side surface 44 is a surface facing the outer surface of the inner case 15 and is formed in a curved shape as shown in FIG. 6, and protrudes inwardly at the lower end portion thereof as shown in FIGS. An inward projecting portion 44a is formed to cover the side work coil 18 from below and prevent heat from the inner case 15 or the inner pot 16 from escaping to the outside.

  In addition, two protrusions 46 are formed at both upper ends of the right side foamed resin member 40a so as to face inward from the respective ends. Each of these protrusions 46 is fitted in a protrusion groove 56 of a flame retardant resin member 50 described later, and has a function of firmly integrating both members.

  Further, a plurality of depressions 47 are formed on the outer lower surface of the right side foamed resin member 40a, and a large cut portion 48 is formed on the front side thereof from the lower side to the upper side. The large cut portion 48 is for avoiding the ferrite core 22 a of the coil support base 22.

  FIG. 9 shows a perspective view of the left side foamed resin member 40b as viewed from an obliquely lower side toward the inside from the outside to the inside. The left side foamed resin member 40b has substantially the same shape as the right side foamed resin member 40a and has a substantially arc shape in plan view. The length of the arc surface is shorter than the semicircular circumference of the inner case 15, and the upper surface 41, the lower surface 42, The outer side surface 43 and the inner side surface 44 are side surfaces connecting the upper surface 41 and the lower surface 42. The upper surface 41 and the lower surface 42 are horizontal surfaces, and a concave fitting portion 45 for fitting the left and right bearing plates 14a, 14a provided on the shoulder member 14 is formed on the upper surface 41.

  The outer side surface 43 is a surface facing the inner surface of the outer case 12 and has a substantially arc shape as shown in FIG. The inner side surface 44 is a surface facing the outer surface of the inner case 15 and is formed in a curved shape as shown in FIG. 6, and an inner side protruding toward the inner side as shown in FIG. The protrusion 44a is formed, covers the side work coil 18 from below, and prevents heat from the inner case 15 or the inner pot 16 from escaping to the outside.

  In addition, two projecting portions 46 are formed at both upper end portions of the left side foamed resin member 40b so as to face inward from the respective end portions. Each of these protrusions 46 is fitted in a protrusion groove 56 of a flame retardant resin member 50 described later, and has a function of firmly integrating both members.

  Further, a plurality of depressions 47 are formed on the outer lower surface of the left side foamed resin member 40b, and a small cut portion 49 is formed on the front side thereof from the lower side to the upper side. The small cut portion 49 is for passing a lead wire (not shown).

  As described above, the foamed resin member 40 composed of the right side foamed resin member 40a and the left side foamed resin member 40b is a member that can easily form only a necessary part by eliminating an unnecessary part, and has a shape retaining property. Therefore, the attachment becomes easy.

  The flame retardant resin member 50 is a flame retardant resin member, for example, a transparent or opaque material obtained by molding a plastic raw material such as PP, PET, PC, PA, PPS or the like into a predetermined shape. This is the case. This flame-retardant resin member 50 is a case-shaped member having a thickness of approximately 2 mm, for example, having a curved surface on the upper and lower sides and an inner side (inner case 15 side) and an outer side (outer case 12 side) as a release surface. The foamed resin member 40 is inserted and integrated from the outer release surface side, and has shape retention and considerable compressive strength. And this flame-retardant resin member 50 is projected to the bottom of the inner case 15 to the position where the lower surface 52 covers the side work coil 18, as shown in FIGS. The inner side surface is molded in a curved state having substantially the same shape as the outer surface of the inner case 15.

  FIG. 5 shows a perspective view of the right flame-retardant resin member 50a as viewed from an obliquely lower side toward the outside from the inside to the outside. The right flame retardant resin member 50a has a substantially arc shape in plan view, like the right foam resin member 40a, and the length of the arc surface is shorter than the semicircle of the inner case 15, and the upper surface 51, the lower surface 52, An inner side surface 54 connecting the inner end of the upper surface 51 and the inner end of the lower surface 52 is provided. The upper surface 51 and the lower surface 52 are horizontal surfaces, and a concave fitting portion 55 for fitting the left and right bearing plates 14 a and 14 a provided on the shoulder member 14 is formed on the upper surface 51.

  The right flame retardant resin member 50a has no surface corresponding to the outer surface 43 of the right foamed resin member 40a, and is an internal space 54b having nothing inside. The shape of the internal space 54b is substantially the same as that of the left flame retardant resin member 50b shown in FIG. By making the right flame retardant resin member 50a into such a case shape, the strength of the right flame retardant resin member 50a is increased and deformation is prevented.

  In addition, two protruding grooves 56 directed inward from the respective end portions are formed at both upper end portions of the right flame retardant resin member 50a. The protrusions 46 of the right side foamed resin member 40a are fitted into the respective protrusion grooves 56, and have a function of firmly integrating both members. The substrate holding member 23 is in contact with the front side surface of the front projection groove 56, the code reel 25 is in contact with the rear side surface of the rear projection groove 56, and the left flame retardant resin member 50b. Thus, the cord reel 25 is supported so as not to rattle (see FIG. 11).

  In addition, a plurality of depressions 57 are formed on the outer lower surface of the right flame-retardant resin member 50a, and a large vertical cut portion 58 is formed on the front side thereof from below to above. The large cut portion 58 is for avoiding the ferrite core 22 a of the coil support base 22.

  The inner surface shape of the inner space 54b of the right flame retardant resin member 50a is substantially the same as the outer surface shape of the right foam resin member 40a, and the size of the inner space 54b of the right flame retardant resin member 50a is larger. When the right foamed resin member 40a is inserted from the outer release surface of the right flame retardant resin member 50a, the upper surface 41, the lower surface 42, the inner side surface 44 and the two protrusions of the right foamed resin member 40a are inserted. The portion 46 is closely fitted in a form in contact with the inner surfaces of the upper surface 51, the lower surface 52, the inner surface 54 and the two protruding grooves 56 of the right flame retardant resin member 50a.

  After the fitting, the right side foamed resin member 40a almost completely enters the inner space 54b of the right side flame retardant resin member 50a, and is fixed after being inserted, and does not pull out the right side foamed resin member 40a with force. As long as the right foamed resin member 40a does not come out.

  The right foamed resin member 40a enters the inner space 54b of the right flame retardant resin member 50a, and the right heat insulating unit 60a, which is the right portion of the heat insulating unit 60, is formed by both members 40a and 50a. A perspective view of this state is shown in FIG. Thus, by integrating both members 40a and 50a, the right heat insulating unit 60a can be disposed in the vicinity of the side work coil 18 without damaging the right foamed resin member 40a, for example, during assembly. When this right heat insulating unit 60a is disposed, a gap (about 3 to 4 mm) for cooling air to flow is provided between the inner surface of the right heat insulating unit 60a and the inner case 15, and the side work coil 18 is overheated. It is preventing.

  FIG. 8 is a perspective view of the left flame retardant resin member 50b as viewed from an obliquely lower side toward the rear side from the outer side to the inner side. The left flame retardant resin member 50b has a substantially arc shape in plan view, like the left foam resin member 40b, and the length of the arc surface is shorter than the semicircular circumference of the inner case 15, and the upper surface 51, the lower surface 52, An inner side surface 54 connecting the inner end of the upper surface 51 and the inner end of the lower surface 52 is provided. The upper surface 51 and the lower surface 52 are horizontal surfaces, and a concave fitting portion 55 for fitting the left and right bearing plates 14 a and 14 a provided on the shoulder member 14 is formed on the upper surface 51.

  The left flame retardant resin member 50b has no surface corresponding to the outer surface 43 of the left foamed resin member 40b, and has an internal space 54b as shown in FIG. By making the left flame retardant resin member 50b into such a case shape, the strength of the left flame retardant resin member 50b is increased and deformation is prevented.

  In addition, two protruding grooves 56 directed inward from the respective end portions are formed at both upper end portions of the left flame retardant resin member 50b. The protrusions 46 of the left side foamed resin member 40b are fitted into the protrusion grooves 56, and have a function of firmly integrating both members. The substrate holding member 23 is brought into contact with the front side surface of the front projection groove 56, the cord reel 25 is brought into contact with the rear side surface of the rear projection groove 56, and the right flame-retardant resin member 50a. Thus, the cord reel 25 is supported so as not to rattle (see FIG. 11).

  Furthermore, a plurality of depressions 57 are formed on the outer lower surface of the left flame retardant resin member 50b, and a small cut portion 59 in the vertical direction is formed on the front side thereof from below to above. The small cut portion 59 is for passing a lead wire (not shown).

  The inner surface shape of the inner space 54b of the left flame retardant resin member 50b is substantially the same as the outer surface shape of the left foam resin member 40b, and the size of the inner space 54b of the left flame retardant resin member 50b is greater. When the left side foamed resin member 40b is inserted from the outer release surface of the left side flame retardant resin member 50b, the upper surface 41, the lower surface 42, the inner side surface 44 and the two protrusions of the left side foamed resin member 40b are inserted. The portion 46 is closely fitted in a form in contact with the inner surfaces of the upper surface 51, the lower surface 52, the inner surface 54, and the two protruding grooves 56 of the left flame retardant resin member 50b.

  After the fitting, the left side foamed resin member 40b almost completely enters the inner space 54b of the left side flame retardant resin member 50b and becomes a fixed state after insertion, and does not pull out the left side foamed resin member 40b with force. As long as the left side foamed resin member 40b does not come out.

  The left foamed resin member 40b enters the internal space 54b of the left flame retardant resin member 50b, and the left heat insulating unit 60b, which is the left part of the heat insulating unit 60, is formed by both members 40b and 50b. A perspective view of this state is shown in FIG. Thus, by integrating both members 40b and 50b, the left heat insulating unit 60b can be disposed in the vicinity of the side work coil 18, for example, without damaging the left foamed resin member 40b during assembly. When the left heat insulating unit 60b is disposed, a gap (about 3 to 4 mm) for cooling air to flow between the inner surface of the left heat insulating unit 60b and the inner case 15 is provided in the same manner as the right heat insulating unit 60a. The overheating of the part work coil 18 is prevented.

  Thus, since the flame-retardant resin member 50 can be easily formed in accordance with the shape of the foamed resin member 40, the heat insulating unit 60 can be easily formed.

  When the rice cooker 10 is assembled, the right heat insulating unit 60a and the left heat insulating unit 60b are arranged in the right space and the left space of the rice cooker 10, respectively. Each unit 60a, 60b is previously formed according to each space, and the assembly is performed easily.

  When assembled, the upper surface 51 of the right heat insulating unit 60a and the left heat insulating unit 60b is brought into contact with the lower surface of the outward flange 15d of the inner case 15, and the lower surface 52 is brought into contact with the upper end surface of the bottom member 13, It is sandwiched between the case 15 and the bottom member 13. That is, no fixing means such as a screw is used for the attachment, and the production cost can be reduced accordingly.

  And as shown in FIG. 11, the board | substrate holding member 23 contact | abuts to the front side surface of the projection groove 56 of the front side of the right side heat insulation unit 60a and the left side heat insulation unit 60b, The cord reel 25 comes into contact. As described above, the board holding member 23 and the cord reel 25 are disposed in the region where the right heat insulating unit 60a and the left heat insulating unit 60b are not provided. As a result, the bottom work coil 17 and the side work coil 18 are not affected. The heat insulation effect is improved.

  Note that the work coil covered by the inward protruding portion 54 a of the heat insulating unit 60 may be a part or all of the side work coil 18. The bottom work coil 17 may be part or all of the bottom work coil 17, but if the bottom work coil 17 is covered, it is not preferable because the cooling air hardly flows and there is a risk of overheating.

  In any case, the heat insulating unit 60 including the right heat insulating unit 60a and the left heat insulating unit 60b has a bottom work coil 17 and a side work coil 18 because the bottom work coil 17 and the side work coil 18 are flame retardant members. The heat insulating unit 60 can be provided close to the rice cooker 10, and as a result, the rice cooker 10 does not increase in size.

  Further, when the heat insulation unit 60 is brought close to the bottom work coil 17 and the side work coil 18, the bottom work coil 17 and the side work coil 18 may be overheated, but the right heat insulation unit 60a and the left heat insulation unit 60b, As described above, a gap, for example, a gap R of about 3 to 4 mm, is provided between the case 15 and part of the cooling air flows through the gap R when the cooling fan 27 is driven. The overheating of the coil 17 and the side work coil 18 is prevented.

  An experiment was conducted to prove this. The measurement conditions were that the IH output was rated power + 5%, the voltage was adjusted so as to maximize the current value (95.1 V), the white rice menu, the selection of hot water, and the water heating. As a result, while the upper limit temperature of the work coil of the Electrical Appliance and Material Safety Law is 150 ° C, the measured value is 111.5 ° C and 118.5 ° C in terms of room temperature of 30 ° C. It was in.

  As shown in FIG. 11, the protrusion groove 56 on the front side of the right heat insulation unit 60a and the left heat insulation unit 60b is separated by a distance W, and the cooling air of the cooling fan 27 passes between the distances W and is rearward. Part of which flows in the gap R as described above. Then, the other part of the cooling air flows backward along the bottom of the inner case 15 to cool the bottom work coil 17 and the like. The cooling air is introduced from a suction hole provided on the front side of the bottom member 13 and discharged from a discharge hole provided on the rear side.

  The right heat insulation unit 60a and the left heat insulation unit 60b are preliminarily formed into a shape that matches the shape of the space between the outer case 12 and the inner case 15 and does not collide with various components at the installation position. Shaped ones can be easily mass-produced. Moreover, since the thing of the same shape can be mass-produced, the heat insulating material cost per piece becomes low.

  Since the heat insulating unit 60 has a considerable compressive strength, if this heat insulating unit 60 is installed in a vertically contacted state between the upper surface of the bottom member 13 and the lower surface of the outward flange 15d of the inner case 15, an error will occur. When the rice cooker 10 is dropped, the heat insulating unit 60 exerts a buffering action against the impact in the vertical direction. Therefore, the heat insulating unit 60 can be used as a cushioning material when dropped in addition to the original heat retaining function.

  In addition, since the heat insulation unit 60 is provided with a gap R serving as a ventilation path, hot air generated in the main body case 11 can be smoothly discharged to the outside through the gap R, and a work coil or the like that is easily damaged by heat is overheated. Can be prevented from being broken or thermally deformed.

  The present invention is not limited to the configuration of the above-described embodiment, and can be appropriately changed in design without departing from the gist of the invention.

DESCRIPTION OF SYMBOLS 10 ... Rice cooker 11 ... Main body case 12 ... Outer case 13 ... Bottom member 14 ... Shoulder member 14a ... Bearing plate 15 ... Inner case 15a ... Bottom wall part 15b ... Curved wall part 15c ... Side wall part 15d ... Outward flange 16 ... Inside Pan 17 ... Bottom work coil 18 ... Side work coil 19 ... Insulating heater 21 ... Temperature sensor 22 ... Coil support 22a ... Ferrite core 23 ... Substrate holding member 24 ... Control board 25 ... Code reel 26 ... Cooling fin 27 ... Cooling fan DESCRIPTION OF SYMBOLS 28 ... Lock mechanism 30 ... Lid 31 ... Outer lid 32 ... Inner lid 33 ... Pressure regulating valve 37 ... Hinge unit 40 ... Foamed resin member 40a ... Right side foamed resin member 40b ... Left side foamed resin member 41 ... Upper surface 42 ... Lower surface 43 ... Outer Side surface 44 ... Inner side surface 44a ... Inward projecting portion 45 ... Recessed fitting portion 46 ... Protrusion portion 47 ... Dimple 48 ... Large cut portion 49 ... Small Recessed portion 50 ... Flame retardant resin member 50a ... Right flame retardant resin member 50b ... Left flame retardant resin member 51 ... Upper surface 52 ... Lower surface 54 ... Inner side surface 54a ... Inward protruding portion 54b ... Inner space 55 ... Recessed fitting portion 56 ... Projection groove 57 ... Indentation 58 ... Large cut portion 59 ... Small cut portion 60 ... Heat insulation unit 60a ... Right heat insulation unit 60b ... Left heat insulation unit

Claims (4)

A rice cooker having a main body case and a lid above the main body case,
In the main body case, it has an inner case, an inner pot housed in the inner case, and a work coil for heating the inner pot,
Between the main body case and the inner case, a heat insulating material composed of a foamed resin member and a flame retardant resin member is disposed so that the flame retardant resin member is located on the work coil side. Rice cooker.   The rice cooker according to claim 1, wherein the heat insulating material covers at least a part of the work coil.   The rice cooker according to claim 1 or 2, wherein a gap through which cooling air flows is provided between the heat insulating material and the work coil.   The rice cooker according to any one of claims 1 to 3, wherein the foamed resin member and the flame-retardant resin member are overlapped and integrated.

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