JP2009279316A - Heating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure safety when a heater is abnormally heated. <P>SOLUTION: In the heating apparatus constituted by arranging a bottomed cylindrical container 22 storing objects to be heated in the inside of an outer body 10 and arranging a bottom heater 34 for heating the inside objects to be heated in the bottom of the container 22, a body heater 44 is further arranged in the side portion of the container 22, a metal made heat shielding member 72 with a cylindrical shape covering the outer peripheral portion of the body heater 44 is arranged between the side portion of the container 22 and the outer body 10, and a top cover member 73 covering the top of the body heater 44 is arranged in the heat shielding member 72. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heating device such as an electric pot, a humidifier, and a rice cooker.

  This type of heating device includes a container that accommodates an object to be heated, and a heater is disposed as a heating unit in the container to heat the object to be heated via the container. Specifically, in an electric pot, water is accommodated as an object to be heated in a container, and the heater is operated to boil the water and keep it at a predetermined temperature. In the humidifier, water is accommodated as an object to be heated inside the container, and the heater is operated to boil the water and supply the steam to the room to humidify the room. In a rice cooker, rice and water are housed as objects to be heated inside a detachable container (pot), and the water is boiled by setting the container in the housing part (container) of the main body and operating the heater. Cook rice.

And in this heating apparatus, the said heater is arrange | positioned at the bottom of the container.
Japanese Patent Laid-Open No. 10-14768

  In the heating apparatus of Patent Document 1, in order to increase the amount of heating by the heater, the shape of the bottom heater becomes large, and thus a significant design change is required. Therefore, a configuration in which a new heater (body heater) is disposed on the side of the cylindrical container is conceivable.

  However, in this heating device, if the microcomputer breaks down (runaway) and becomes in an abnormal heating state where it continues to be heated by the heater, the heat is transferred to the resin exterior body through the container and melted and melted. There is a problem that the resin adheres to the body heater along the surface of the container.

  This invention is made in view of the conventional problem, and makes it a subject to provide the heating apparatus which can ensure the safety | security when a heater abnormally heats.

  In order to solve the above-described problems, the heating device of the present invention has a bottomed cylindrical container that accommodates an object to be heated inside the exterior body, and a bottom that heats the object to be heated inside the container. In a heating apparatus provided with a heater, a cylinder heater is further provided on the side of the container, and a cylindrical metal covering the outer periphery of the cylinder heater is provided between the side of the container and the exterior body. The heat shield member is provided, and the heat shield member is provided with an upper cover portion that covers the upper side of the body heater.

  According to this heating apparatus, since the body heater is disposed on the side of the container, the heating capacity can be increased without making a significant design change. Further, since the heat shield member is disposed so as to cover the outer peripheral portion of the drum heater, it is possible to prevent the surrounding resin parts from being melted by heating the drum heater. In addition, since the heat shield member is provided with an upper cover portion that covers the upper side of the body heater, the bottom heater and the body heater are in an abnormally heated state, and the resin exterior body is melted through the container. However, the molten resin can be prevented from adhering to the drum heater through the container.

  In this heating apparatus, the heat-shielding member is formed by punching a metal plate, and is provided with positioning portions for preventing positional deviation along the axial direction on both side edges thereof. It is preferable that attachment is possible from the bottom side of the container after attachment. In this way, assembly workability can be improved.

  The upper cover portion preferably includes a plurality of slits extending along the axial direction, and has a substantially conical cylinder shape whose diameter is gradually reduced toward the upper side. In this way, when the metal plate is punched and formed, the upper cover portion can be easily and reliably formed.

  Furthermore, it is preferable that the upper cover part of the heat shield member is formed with a dimension that allows a gap through which the molten resin cannot pass between the container and the container. In this way, the temperature rise of the heat shield member due to the heat of the container can be suppressed, and adhesion of the molten resin to the body heater can be reliably prevented.

  Moreover, it is preferable to fix the said heat shield member to the bottom heat shield member arrange | positioned between the bottom of the said container, and an exterior body. In this way, rotation and deformation of the heat shield member can be prevented. In addition, the gap between the upper cover portion and the container can be stabilized.

  In the heating apparatus according to the present invention, since the body heater is disposed on the side of the container, the heating capacity can be increased without making a significant design change. Further, since the heat shield member is disposed so as to cover the outer peripheral portion of the drum heater, it is possible to prevent the surrounding resin parts from being melted by heating the drum heater. In addition, since the heat shield member is provided with an upper cover portion that covers the upper side of the body heater, the bottom heater and the body heater are in an abnormally heated state, and the resin exterior body is melted through the container. However, the molten resin can be prevented from adhering to the drum heater through the container.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an electric pot that is a heating device according to an embodiment of the present invention. In this electric pot, a bottomed cylindrical container 22 that contains water to be heated is disposed in the exterior body 10, the water in the container 22 is heated by boiling heaters 34 and 44, and hot water supply By operating the pump 26, hot water is discharged from the discharge unit 30 via the pumping pipe 28.

  The exterior body 10 includes a cylindrical body 11, a shoulder body 17 attached to an upper portion of the body 11, and a lid body 21 attached to the shoulder body 17 so as to be opened and closed.

  The lower end opening of the body 11 is closed by the lower plate 12. Further, the body 11 is provided with a nose portion 13 projecting outward on the front surface, and an ejection opening portion 14 opened downward near the tip thereof. Further, a rectangular opening 15 is provided on the front side of the body 11, and a transparent window member 16 capable of seeing through the inside is disposed in the opening 15.

  The shoulder body 17 is made of resin (polypropylene), has a lower end shape that coincides with the upper end opening of the body 11, and a hinge connection portion for attaching the lid body 21 to the rear side so as to be detachable and rotatable. 18 is provided. The shoulder body 17 has a shape in which a portion located above the nose portion 13 is curved downward toward the tip, and an operation panel portion 19 is provided at that portion. On the back side of the operation panel portion 19, a lid disposing portion 20 that is recessed downward is provided, and an opening (not shown) that exposes the inside of the container 22 is provided in the lid disposing portion 20. .

  The lid body 21 has the same shape as the lid arrangement portion 20 of the shoulder body 17 and is pivotally attached to the hinge connection portion 18 so as to seal the upper end opening of the container 22 so as to be opened and closed. The lid body 21 is provided with an operation member (not shown) that is locked to the shoulder body 17 so as not to be opened and is unlocked by an opening operation.

  The container 22 is made of metal (stainless steel (SUS436L)) including a cylindrical container body 23 attached to the opening of the shoulder body 17 and a container bottom body 24 that closes the lower end opening of the container body 23. It is. The container bottom body 24 is provided with a connection hole 25 for connecting a hot water supply pump 26. The hot water supply pump 26 is connected to a pumping pipe 28 located behind the window member 16 via a joint member 27 having a substantially L shape. Further, a valve set 29 for preventing water leakage at the time of falling is connected to the upper end of the pumping pipe 28, and a discharge unit 30 disposed in the discharge opening 14 is provided in the valve set 29. . Further, the container 22 is provided with a heater mounting portion 31 that is recessed upward toward the inside of the container 22 at a position excluding the connection hole 25 in the container bottom body 24, and further has a circular shape at the center of the heater mounting portion 31. Thus, a sensor arrangement portion 32 that is recessed upward is provided.

  A bottom heater unit 33 is disposed in the heater mounting portion 31 of the container 22 as a heating means for boiling and keeping warm the water stored in the container 22. Moreover, the container 22 of this embodiment is further provided with a body heater unit 43 as a heating means for boiling water on the outer periphery of the container body 23 which is the lower end of the side part. In addition, the trunk | drum heater of this invention contains the trunk | drum heater unit 43 containing the substantial trunk | boiling boiling heater 44 mentioned later.

  As shown in FIG. 2, the bottom heater unit 33 includes a bottom boiling heater 34, a bottom heat retaining heater 35, an insulating plate 38 that insulates the heaters 34 and 35, and both ends, and a heater in which these are stacked inside. And a cover 39. The bottom boiling heater 34 is operated (energized) during boiling processing, and can output 905 W, for example. The bottom heat retaining heater 35 is operated during the heat retaining process, and can output 65 W, for example. These heaters 34 and 35 are obtained by winding a nichrome wire 37 (heating wire) around a mica plate 36 having a through hole 36a in the center. The insulating plate 38 is a mica plate having a through hole 38a at the center. The heater cover 39 is made of metal (aluminum) and serves as a heat radiating plate that averages the heat generated by the internal heaters 34 and 35 and supplies the heat to the container bottom 24, and has a shape slightly smaller than the heater mounting portion 31. A base plate portion 40 is formed, and three bent plate portions 41a, 41b, and 41c that are substantially the same shape as the base plate portion 40 when bent. The bottom heater unit 33 is disposed so as to be accommodated in the heater mounting portion 31, and the surface (bottom side) thereof is joined by a metal covering member 42 so as not to be detached.

  As shown in FIG. 3, the body heater unit 43 includes a body boiling heater 44 having a rectangular (band) shape, a holding frame 47 having a C shape in plan view, and a protective member 51 that protects the body boiling heater 44. It has. The body boiling heater 44 is operated at the time of boiling processing. For example, the body boiling heater 44 can output 295 W so as to be 1200 W together with the bottom boiling heater 34. The body boiling heater 44 is formed by winding a nichrome wire 46 (electric heating wire) so as to form a spiral shape around a plate-like mica plate 45. The holding frame 47 is made of metal (aluminum) and serves as a heat radiating plate, and has a substantially C-shaped cross section including an inner surface portion 48, an outer surface upper frame portion 49, and an outer surface lower frame portion 50. The protection member 51 is made of metal (iron) and has a diameter slightly smaller than the outer shape of the container body 23. At both ends of the protective member 51, to-be-tightened portions 52A and 52B having screw insertion grooves 52a punched out so as to form a U shape from the front end edge are provided so as to protrude outward. Further, the protective member 51 is provided with an exposure hole 53 for exposing the connecting portion 46a of the body boiling heater 44 located inside.

  As shown in FIGS. 4 and 5, the body heater unit 43 is mounted by being screwed to the lower end of the side portion of the container 22 by a fixing metal 54. As shown in FIG. 6, the fixing bracket 54 includes a pair of plate-like members 55 and 60. The first plate-like member 55 has an L shape in a plan view having an insertion portion 56 having an insertion hole 56 a through which a screw shaft is inserted, and a cover portion 57 bent from the outer edge of the insertion portion 56. A pair of protruding pieces 58 are provided on the inner end edge of the insertion portion 56 so as to protrude inward. A washer plate 59 is fixed to the outer surface of the insertion portion 56. The second plate-shaped member 60 is a rectangular shape having the same shape as the insertion portion 56. The second plate member 60 is provided with a screw hole 61 for tightening the screw 67. Similarly to the first plate-like member 55, a pair of projecting pieces 62 are provided on the inner edge so as to protrude inward.

  In the present embodiment, as shown in FIGS. 4 and 5, the fixing metal 54 is provided with one piece for preventing abnormal heating of the body heater unit 43 and the bottom heater unit 33 on the surface of the body heater unit 43. A mounting bracket 63 for disposing the temperature fuse 68 is integrally attached by tightening. As shown in FIG. 6, the mounting bracket 63 is made of an elastic metal (stainless steel) plate. The mounting bracket 63 includes a holding portion 64 that holds the temperature fuse 68 and a mounting portion 65 that is fixed to the fixing bracket 54. Similar to the screw insertion groove 52 a of the protection member 51, the attachment portion 65 is provided with a screw insertion groove 66 punched out so as to form a U shape from the end edge.

  The fixing bracket 54 and the mounting bracket 63 are positioned so that the mounting portion 65 is superimposed on the tightened portion 52A in a state where the body heater unit 43 is positioned at a predetermined position on the side portion of the container 22, and the screw 67 The fixing metal fitting 54 in the state of being temporarily tightened is inserted into the insertion grooves 52a and 66, and the screw 67 is tightened. Thereby, a pair of to-be-clamped part 52A, 52B is made to adjoin, the body boiling heater 44 and the holding frame 47 which are located inside are press-contacted together the side part of the container 22, and the body heater unit 43 is made with respect to the container 22 Fix it. At the same time, when the mounting portion 65 of the mounting bracket 63 is tightened, the temperature fuse 68 held by the holding portion 64 is elastically directed toward the protective member 51 that covers (protects) the body boiling heater 44. Be energized. In the present embodiment, this temperature fuse 68 is interposed upstream of the branch connection portion of the bottom boiling heater 34 and the trunk boiling heater 44 connected in parallel, so that both the boiling heaters 34 and 44 are in a normal state. Even when the boiling heaters 34 and 44 are disconnected, abnormal heating can be prevented.

  In this electric pot, as shown in FIG. 1, a thermistor 69, which is a temperature detecting means for detecting the internal water temperature via the container 22, passes through the bottom heater unit 33 and contacts the sensor arrangement portion 32. It is arranged to do. A metal bottom heat shield member 70 is disposed between the container 22 and the bottom of the outer package 10 (lower plate 12) so as to cover the bottom of the container, and the bottom heater unit 33 for the control board case 71. It is configured to block the heat. Furthermore, between the side of the container 22 and the body 11 of the exterior body 10, a metal body heat shield member 72 is disposed so as to cover the body heater unit 43 disposed at the lower part of the container body 23. The body heater unit 43 is configured to shut off the heat of the resin product close to the pumping pipe 28 or the like.

  As shown in FIGS. 1 and 7, the trunk heat shield member 72 has a cylindrical shape, and an upper portion thereof covers the upper side of the trunk heater unit 43 so that the diameter gradually decreases upward. An upper cover portion 73 having a substantially conical cylindrical shape with a reduced diameter is provided. The body heat shield member 72 is formed in a cylindrical shape by punching a flat metal plate and then drawing, and then formed in a cylindrical shape by assembling the container 22. The inner diameter of the body heat shield member 72 is larger than the outer diameter of the assembled body heater unit 43 and smaller than the dimension from the body heater unit 43 to the outer end of the fixing bracket 54. Moreover, the upper cover part 73 is provided with the inner cylinder part 74 which protrudes upwards so that the inner edge may form a cylinder shape. The inner cylinder 74 has an inner diameter slightly larger than the outer diameter of the container body 23, and is set so that a gap with a predetermined interval is formed therebetween. This gap is set to a dimension (1.5 mm in the present embodiment) in which the molten resin of the shoulder body 17 to which the container 22 is fixed cannot pass due to the action of surface tension.

  As shown in FIG. 8, the blank of the body heat shield member 72 is formed with notches 75a and 75b for exposing the fixing bracket 54 and the mounting bracket 63 of the barrel heater unit 43 at the lower ends of both ends of a horizontally long rectangular plate. It is a thing. In order to form the upper cover portion 73 with a reduced diameter, the blank is provided with a plurality of slits 76 that extend downward from the upper edge and extend in the axial direction in an assembled state by punching. The slit 76 is used to overlap an excess portion when the upper cover portion 73 is drawn into a conical cylinder shape. Further, on both side edges of the blank except for the cutout portions 75a and 75b, a concave portion 77 and a convex piece 78 that mesh with each other are provided as positioning portions for preventing positional displacement along the axial direction in a cylindrical state. Yes. Further, a fixing piece 79 provided with a screw insertion hole 79a protrudes from the lower end edge of the blank excluding the notches 75a and 75b. It is configured.

  As described above, the body heat shield member 72 before assembly has a cylindrical shape by drawing. Then, at the time of assembly, as shown in FIG. 4, the container 22 is inserted from the bottom side into the container 22 in a state where the trunk heater unit 43 including the thermal fuse 68 is mounted. At this time, both side edges of the cylindrical body heat shield member 72 are separated from each other so as to form a C shape in plan view. In this state, the fixing bracket 54 is passed so that the fixing bracket 54 is positioned therebetween. Thereafter, as shown in FIGS. 9 and 10, when the fixing metal 54 is positioned in the notches 75 a and 75 b, both side edges of the separated blank are brought close to each other, and the concave portion 77 and the convex piece 78 are engaged with each other. In this state, the bottom heat shield member 70 is disposed on the bottom side of the container 22, and the bottom heat shield member 70 and the fixing piece 79 of the trunk heat shield member 72 are fixed by screws.

  As described above, in the electric pot of this embodiment, the body heat insulating member 72 covering the periphery of the body heater unit 43 is formed by punching a metal plate and can be attached from the bottom side of the container 22. Can be improved. In addition, since the body heat shield member 72 is fixed to the bottom heat shield member 70 with screws, the body heat shield member 72 can be reliably maintained in a cylindrical shape in which both side edges are abutted, and can be prevented from rotating and deforming along the axial direction. In addition, the gap between the upper cover portion 73 and the container 22 can be stabilized.

  The electric pot configured as described above is provided with a control board 80 including a power supply unit in the control board case 71, and is boiled according to a program stored in advance by a microcomputer which is a control means mounted on the control board 80. Processing, reboil processing, and heat retention processing are performed. Specifically, when it is detected that the user has connected the power cord to the commercial power source, or when the user detects a temperature drop of 10 ° C. or more by adding water during the heat retaining process by the thermistor 69, the boiling process is performed. After the execution, the heat insulation process is subsequently executed. Further, the re-boiling process is executed in accordance with the switch operation of the operation panel unit 19, and then the heat retaining process is executed. Further, the hot water supply pump 26 is operated according to the switch operation to execute the hot water supply process.

  At the time of boiling processing including re-boiling, since the body boiling heater 44 is provided in this embodiment, the heating capacity is larger than that of a conventional electric pot equipped with only the bottom boiling heater 34, and water is supplied. The time required for boiling can be shortened. In addition, since the bottom heater unit 33 does not require any design change from the conventional one, it is possible to suppress an increase in manufacturing cost. Further, since the body heat shield member 72 is disposed around the body boiling heater 44, it is possible to prevent the surrounding resin parts such as the water pump pipe 28 from being melted by heating. Further, in the present embodiment, the body heat shield member 72 is formed with an upper cover portion 73 that is close to the outer peripheral surface of the container 22, but there is a predetermined gap between the upper cover portion 73 and the container 22. Since it is provided, the temperature rise of the heat shield member due to the heat of the container 22 can be suppressed.

  On the other hand, when the boiling heaters 34 and 44 are abnormally heated due to a failure of the microcomputer during the boiling process, the temperature fuse 68 having a small capacity is normally melted by the heat of both the boiling heaters 34 and 44. (Shut off), and both the boiling heaters 34 and 44 cannot be heated.

  However, if the thermal fuse 68 is not melted for some reason, the boiling heaters 34 and 44 continue to be heated. And the overheating by these is transmitted to the shoulder body 17 which is the resin component which fixed this container 22 through the container 22, and this shoulder body 17 is melted. In this case, the molten resin travels through the container 22 and adheres to the surface of the drum boiling heater 44. In this embodiment, a drum heat insulating member 72 having an upper cover portion 73 is provided in the container 22. Therefore, the molten resin can be prevented from adhering to the drum heater unit 43 as well as the drum boiling heater 44 through the container 22. At this time, a gap is formed between the upper cover 73 of the present embodiment and the container 22, but since this gap is set with a dimension that the molten resin cannot pass through, the safety is ensured. Can be secured.

  In addition, the heating apparatus of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, in the above-described embodiment, the body heat shield member 72 is provided with the concave portion 77 and the convex piece 78 as the positioning portion for preventing the positional deviation along the axial direction, but as shown in FIG. It is good also as a structure which provides the positioning hole 81 in a side part, protrudes the positioning piece 82 in the other side edge, and inserts this positioning piece 82 in the positioning hole 81. FIG.

  Moreover, in the said embodiment, although the upper body cover member 73 integrally provided the upper cover part 73 of the upper part, as shown in FIG. 12, you may provide it by another member. In this case, it is preferable that the upper cover portion 73 is provided with attachment pieces projecting outward on both side edges and fastened with screws. If it does in this way, after attaching cover part 73, it will be possible to arrange body heater unit 43, and after that, it will be possible to mount the body part of body heat insulation member 72, and the freedom concerning attachment work will be improved. it can.

  Furthermore, in the said embodiment, although the electric kettle was mentioned as an example as an apparatus which adds the trunk | drum heater 44 and the heat-insulation member 72, the heating apparatus which attaches the heater which is a heating means to the container 22, such as a humidifier and a rice cooker. Any of them can be applied, and similar actions and effects can be obtained.

It is sectional drawing which shows the electric pot which is a heating apparatus which concerns on embodiment of this invention. It is a disassembled perspective view which shows the heater arrange | positioned at the bottom of a container. It is a disassembled perspective view which shows the heater arrange | positioned at the side part of a container. It is a front view which shows the state which has arrange | positioned the trunk | drum heater to the container. FIG. 5 is a partially enlarged bottom view of FIG. 4. FIG. 5 is a partially enlarged exploded perspective view of FIG. 4. It is a perspective view which shows the state which has arrange | positioned the trunk | drum heat insulation member in the container. It is a top view which shows the blank of a trunk | drum heat insulation member. It is a front view which shows the state which has arrange | positioned the trunk | drum heat insulation member in the container. FIG. 10 is a bottom view of FIG. 9. It is a top view which shows the blank of the modification of a trunk | drum heat insulation member. It is a front view which shows the other modification of a trunk | drum heat insulation member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Exterior body 11 ... Body 12 ... Lower plate 17 ... Shoulder body 21 ... Cover body 22 ... Container 33 ... Bottom heater unit 34 ... Bottom boiling heater 35 ... Bottom heat retention heater 43 ... Body heater unit 44 ... Body boiling heater 54 ... Fixed Metal fitting 63 ... Mounting metal fitting 70 ... Bottom heat shield member 72 ... Body heat shield member 73 ... Upper cover part 74 ... Inner cylinder part 75a, 75b ... Notch part 76 ... Slit 77 ... Recessed part (positioning part)
78 ... convex piece (positioning part)
79 ... fixed piece

Claims (5)

In a heating apparatus in which a bottomed cylindrical container that accommodates an object to be heated is disposed inside the exterior body, and a bottom heater that heats the object to be heated is disposed on the bottom of the container.
Further disposing a body heater on the side of the container,
Between the side part of the container and the exterior body, a cylindrical metal heat shield member that covers the outer periphery of the drum heater is disposed, and the heat shield member covers the upper portion of the drum heater. A heating device provided with an upper cover.   The heat shield member is formed by punching a metal plate, and is provided with positioning portions on both side edges to prevent positional displacement along the axial direction, and after the body heater is attached to the container, the container The heating device according to claim 1, wherein the heating device can be attached from the bottom side.   The said upper cover part is provided with the some slit extended along an axial direction, and makes | forms the substantially conical cylinder shape diameter-reduced so that a diameter may become small gradually toward upper direction, The Claim 1 or Claim 2 characterized by the above-mentioned. Heating equipment as described in.   The upper cover portion of the heat shield member is formed to have a dimension that allows a gap through which molten resin cannot pass between the heat shield member and the container. The heating device according to Item.   The said heat insulation member was fixed to the bottom heat insulation member arrange | positioned between the bottom of the said container, and an exterior body, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. Heating equipment.

Images