JPH0588414U - Electric rice cooker - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide an energy-saving type electric rice cooker that has an inner container with high heat insulation effect and consumes less power. [Constitution] The inner container 73 forming the inside of the electric rice cooker main body,
A vacuum double structure is formed by an inner plate and an outer plate each having a bottomed container shape without holes, and a temperature sensor 80 and a rice cooking heater 82 are arranged on the inner bottom surface of the inner plate. As for the arrangement of the temperature sensor and the rice cooking heater, a fixture is welded to the inner bottom surface of the inner plate and attached to the fixture.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to an electric rice cooker. In particular, this invention relates to an electric rice cooker with an inner container having a double-layer structure.

[0002]

[Prior Art]

 Conventionally, in order to improve rice cooking efficiency and heat retention efficiency, an attempt has been made to make the inner container of the electric rice cooker have a double-layer structure. The vacuum double structure is a structure in which an inner unit and an outer unit are doubled to form a vacuum chamber inside. Since such a structure has a high heat insulation effect, it is widely used in thermos bottles and the like.

[0003]

[Problems to be solved by the device]

 Although it is a vacuum double structure with a high heat insulation effect as described above, the following problems have hitherto been adopted in the electric rice cooker. That is, in an electric rice cooker, a temperature sensor and a rice cooking heater must be placed on the inner bottom of the inner container, and when the inner container has a vacuum double structure, it becomes difficult to attach the temperature sensor and the rice cooking heater. However, there is a drawback that it takes time to assemble.

A lead wire connected to a temperature sensor arranged at the inner bottom portion of the inner container is connected to a control circuit, and a lead wire for supplying electric power to the rice cooking heater is connected to a control circuit and a power source outside the inner container. In order to connect to the terminals, an opening must be formed in the bottom of the inner container to pass the lead wire. Therefore, even if the side surface of the inner container has a double vacuum structure, heat is released from the bottom opening, which lowers rice cooking efficiency and heat retention efficiency. Etc.

The present invention has been made against the background of such a conventional technique, and the inner container has a vacuum double structure, and by devising the shape and / or the structure of the inner container, the heat insulating effect is substantially high. The purpose is to provide an energy-saving type electric rice cooker with low power consumption.

[0006]

[Means for Solving the Problems]

 This invention is an electric rice cooker including an inner container for accommodating an inner pot, and a temperature sensor and a rice cooking heater provided on the inner bottom portion of the inner container, each inner container having no holes. It has a double structure of an inner unit and an outer unit in the shape of a container at the bottom, and the upper edges of the inner unit and the outer unit are joined, and the inside of the double structure is evacuated. An attachment tool is provided on the bottom surface, and a temperature sensor and a rice cooking heater are held by the attachment tool.

Further, according to the present invention, in the electric rice cooker, a vertical groove for accommodating a lead wire is formed in the inner unit from the bottom surface to the upper edge portion, and the temperature sensor and the rice cooker heater are formed. The lead wire to be connected is characterized in that it is wired in the vertical groove and guided to the outside of the inner container. Furthermore, the invention is characterized in that, in the electric rice cooker, both the inner unit and the outer unit forming the inner container are made of metal.

Further, the present invention is characterized in that, in the electric rice cooker, a heat retaining function is further provided in the inner container.

[0009]

[Action]

 The inner container has a vacuum double structure in the shape of a bottomed container without holes, and a high heat insulation effect can be obtained. In particular, since no holes or the like are formed in the bottom surface of the inner container, the heat generated by the rice cooking heater does not escape from the bottom surface of the inner container, so that the rice cooking effect and the heat retaining effect can be enhanced.

[0010]

【Example】

 Hereinafter, some embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic side half sectional view for explaining the structure of an electric rice cooker according to an embodiment of the present invention. The electric rice cooker according to this embodiment includes a main body 71, a lid unit 86 for covering an upper opening of the main body 71, and an inner pot 84 accommodated in the main body 71.

The main body 71 has a cylindrical cover member 72 formed of a thin metal plate forming an outer side thereof, an inner container 73 forming an inner side thereof, an upper edge portion of the cover member 72 and an upper edge of the inner container 73. A shoulder member 74 that forms a shoulder portion of the main body 71 by connecting the parts to each other and a bottom member 75 that is fitted to the lower edge portion of the cover member 72 and forms the bottom of the main body 71 are provided. Further, in this embodiment, the inner container 73 is double formed of an inner container 76 and an outer container 77 made of metal, for example, stainless steel, and a vacuum inner space is provided between the inner container 76 and the outer container 77. 78 is formed. Moreover, each of the inner unit 76 and the outer unit 77 has a bottomed container shape having a bottom and an upper opening, and a flange 79 that projects outward in the upper opening is formed. At the flange portion 79, the inner unit 70 and the outer unit 77 are joined by welding. When the inner container 73 has such a structure, unlike the embodiment described above, the welding portion of the inner container 73 can be only the upper edge portion, the number of welding portions is small, and the structure is simple. It can be an inner container that is easy to operate. This is one of the features of this embodiment.

By the way, when the inner container 73 as in this embodiment is adopted, the rice cooking heater unit 83 including the temperature sensor 80, the heating plate 81 and the rice cooking heater 82 to be arranged on the inner bottom surface of the inner container 73 can be mounted. It is difficult and the wiring process of the lead wire connected to the temperature sensor 80 and the rice cooking heater 82 is difficult. Therefore, conventionally, it was difficult to attach the temperature sensor 80, the rice cooking heater unit 83, and the like to the structure of the inner container 73 as in this embodiment only by merely thinking of it. Therefore, in the present invention, a mounting structure described later is adopted.

The electric rice cooker shown in FIG. 1 will be further described. The inner pan 84 is housed in the inner container 73, the bottom surface of which is placed on the rice cooking heater unit 83 and contacts the temperature sensor 80. An electric circuit board 85 is incorporated in the bottom member 75. The electric circuit board 85 includes a power supply circuit and a control microcomputer, and controls energization of the rice cooking heater unit 83.

The lid unit 86 is detachably attached to the shoulder member 74 of the main body 71. The lid unit 86 is provided with a pot lid 87 for closing the upper opening of the inner pot 84 when closed. Further, the lid unit 86 is provided with a heat radiating plate 87 made of a metal plate which forms the back surface thereof, and a heat retention heater 88 for heating the heat radiating plate 87.

Further, as shown in FIG. 2, the shoulder member 74 is provided with a horizontal portion 741 and an auxiliary convex portion 742 provided on the lower side thereof, and the horizontal portion 741 and the auxiliary convex portion 742 are provided. The flange portion 79 of the inner container 73 described above is fitted between and. In this case, when the upper surface of the auxiliary convex portion 742 is, for example, an inclined surface having an upward slope with respect to the right rotation direction, when the flange portion 79 of the inner container 73 is fitted to the shoulder member 74, The container 73 can be fitted while rotating, and the inner container 73 and the shoulder member 74 can be fitted firmly without rattling.

FIG. 3 is a cross-sectional view showing a detailed structure of the bottom portion of the inner container 73 in the electric rice cooker body 71 shown in FIG. Further, FIG. 4 is an exploded perspective view for explaining a mounting structure of the temperature sensor 80 and the rice cooking heater unit 83. Explaining with reference to FIG. 3 and FIG. 4, of the stainless steel inner container 76 and outer container 77 forming the inner container 73, a pair of fixing fittings 91, 92 are welded to the inner bottom surface of the inner container 76. Has been done. The rice cooking heater unit 83 has a circular shape when viewed from above, and has a sensor storage hole 93 formed in the center thereof. The sensor holding case 94 is fitted in the sensor receiving hole 93, and the rice cooking heater unit 83 is locked by the pair of left and right flanges 95 and 96 provided in the sensor holding case 94. More specifically, step portions 103 and 104 projecting into the hole 93 are formed on both left and right inner peripheral edges of the sensor housing hole 93, and these step portions 103 and 104 are the flanges 95 of the sensor holding case 94. , 96. The holes 97 and 98 formed in the collars 95 and 96 and the holes 99 and 100 formed in the fixing fittings 91 and 92 face each other, and are fixed by set screws 101 and 102, respectively.

The temperature sensor 80 housed in the sensor holding case 94 is elastically held by a coil spring 90 surrounding it, and is biased upward. Therefore, in the state where the inner pan 84 is not housed, the temperature sensor 80 is displaced upward by the coil spring 90, and the upper surface thereof projects beyond the upper surface of the rice cooking heater unit 83. A stopper 105 is provided on the bottom surface side of the temperature sensor 80 in order to regulate the amount of upward displacement of the temperature sensor 80. The stopper 105 has a hook-shaped lower end, and the hook-shaped portion engages with the sensor holding case 94 to prevent the temperature sensor 80 from being displaced more than necessary. Then, as shown in FIG. 3, when the inner pot 84 is housed, the temperature sensor 80 is pushed downward by the bottom bottom surface of the inner pot 84 to be flush with the upper surface of the rice cooking heater unit 83, and the temperature sensor 80 is Operate.

FIG. 5 is a schematic cross-sectional view showing a specific configuration example of the temperature sensor 80. Referring to FIG. 5, the temperature sensor 80 has a holding metal fitting 801 built therein, and a sensor element 802 is embedded above the holding metal fitting 801. Further, a reed switch 803 and a magnet 804 are held below the holding metal fitting 801 at regular intervals. Further, a shield plate 805 is provided to shield the magnetic force between the reed switch 803 and the magnet 804 when the entire temperature sensor 80 including the holding metal piece 801 is lowered. Therefore, when the holding metal fitting 801 is raised as shown in the figure, the reed switch 803 senses the magnetic force of the magnet 804 and is turned on, for example. On the other hand, when the inner pot is stored and the whole temperature sensor 80 is pushed down by the bottom of the pot, the shield plate 805 is inserted between the reed switch 803 and the magnet 804, and the reed switch 803 does not feel the magnetic force of the magnet 804 and is turned off, for example. Switch to. In this way, the presence / absence of the inner pot is detected by the reed switch 803.

By using the mounting structure of the temperature sensor 80 and the rice cooking heater unit 83 according to this embodiment, a pair of fixing metal fittings 91 and 92 welded to the inner container 76 of the inner container and the sensor holding case 94 are attached. The temperature sensor 80 and the rice cooking heater unit 83 can be easily attached only by fixing them with the set screws 101 and 102, and the attachment work can be simplified.

Further, since the inner container 73 is a bottomed cylindrical container having no holes at the bottom thereof, the heat generated by the rice cooking heater unit 83 does not escape downward or sideways, and the inner pan 84 is efficiently placed. It can be heated. Therefore, it is possible to provide an electric rice cooker with low power consumption and high energy saving effect. 6 and 7 are a sectional view and an exploded perspective view for explaining another attachment structure of the temperature sensor 80 and the rice cooking heater unit 83. In the mounting structure shown in FIGS. 6 and 7, the sensor holding case 112 and the rice cooking heater unit 83 are mounted on one fixing metal fitting 111. In this mounting structure, as shown in FIG. 6, the central portion of the fixing member 111 is welded to the center of the inner container 76 of the inner container 73. Further, the rice cooker heater unit 83 is formed with a sensor housing hole 115 which is slightly larger than the sensor holding case 112, and projecting step portions 116 and 117 are formed at both opposite edges in the sensor housing hole 115, respectively. Screw holes 118, 119 are formed in the protruding step portions 116, 117.

As shown in FIG. 6, in the attached state, the fixing metal fitting 111 is fitted into the sensor housing hole 115, and the protruding step portions 116 and 117 are pressed by the left and right flanges 113 and 114 of the fixing metal fitting 111. ing. In order to mount in this way, at the time of mounting, the fixing metal fitting 111 is housed in the sensor housing hole 115 of the rice cooking heater unit 83, and the rice cooking heater unit 83 is rotated so that the fixing metal fitting 111 protrudes from the collars 113 and 114. The alignment with the stepped portions 116 and 117 may be performed. Further, the coil spring 90 is housed in the sensor holding case 112, the sensor holding case 112 is engaged with the fixing metal fitting 111 with the temperature sensor 80 fitted, and the hole formed in the flange 120 of the sensor holding case 112. The screws 121 and 122 are aligned with the holes 123 and 124 formed in the collars 113 and 114 of the fixing bracket 111, and fixed by the setscrews 101 and 102.

In the mounting structure of this embodiment, since the fixing metal fitting 111 is a single member, there is an advantage in that when the fixing metal fitting 111 is welded to the inner unit 76, the positioning is easy and the welding is easy. Other advantages and effects are the same as those of the mounting structure described in FIGS. 3 and 4.

FIG. 8 is a side sectional view showing the structure of an electric rice cooker according to another embodiment of the present invention, showing the sectional structure of the left half. In summary, the features of the embodiment shown in FIG. 8 are such that the rice cooking heater unit 83 can be vertically displaced, and when the inner pan 84 is housed in the inner container 73, the inner pan 84 is The rice cooking heater unit 83 is pushed downward by the bottom surface, and the upper end flange portion 88 of the inner pot 84 contacts the shoulder member 74, so that the flange portion 88 and the shoulder member 74 can be sealed without any gap. That is.

More specifically, a fixing member 131 is fixed to the inner bottom surface of the inner container 76 of the inner container 73 by welding. On the other hand, the rice cooking heater unit 83 includes a hot plate 81 and a rice cooking heater 82 embedded in the hot plate 81, and a coil spring 132 is arranged on the lower surface side thereof, and is attached to the lower end of the coil spring 132. The metal fitting 133 is connected. Then, the mounting bracket 133 and the fixing bracket 131 are fixed by a screw 134. Therefore, the rice cooking heater unit 83 is elastically held via the coil spring 132. Further, a stopper metal fitting 135 is fixed to the rice cooking heater unit 83, and when the inner pan 83 is not housed, the rice cooker heater unit 83 is regulated so that the rice cooking heater unit 83 does not rise too high. There is. Further, in this embodiment, the temperature sensor 80 is attached to the central portion of the heating plate 81 via the sensor holding fitting 136 and the coil spring 137. Therefore, the temperature sensor 80 itself can be displaced up and down independently of the rice cooking heater unit 83 by the action of the coil spring 137. Moreover, it moves up and down as the rice heating heater unit 83 moves up and down.

When the rice cooking heater unit 83 has such a configuration, when the inner pan 84 is housed in the inner container 73, the rice cooking heater unit 83 is pushed downward by the bottom surface of the inner pan 84. Then, the inner pot 84 is stored with the upper flange portion 88 being locked by the shoulder member 74. Therefore, the flange portion 88 of the inner pot 84 and the shoulder member 74 are surely brought into contact with each other, and the inner container 76 of the inner container 73 and the inner pot 84 serve as a substantially sealed heating space 89, and the rice cooking heater 82 is heated. Heat does not escape from above.

The other configurations in FIG. 8 are the same as those in FIG. 1, and the same or corresponding parts are denoted by the same reference numerals and the description thereof is omitted here. FIG. 9 is a side sectional view showing a wiring processing structure of the lead wire of the temperature sensor and the lead wire of the rice cooker applicable to each embodiment described in FIGS. 1 to 8. FIG. FIG. 11 is an enlarged partial perspective view, and FIG. 11 is a sectional view of a plane portion taken along the line BB in FIG. 9.

Next, referring to FIGS. 9, 10 and 11, the lead wire 107 connected to the rice cooking heater 82 is inserted into the vertical groove 141 formed in the inner container 76 of the inner container 73. It is arranged, guided upward along the inner container 76, and led out between the inner container 73 and the cover member 72 via the lead wire insertion groove 142 formed in the shoulder member 74. The lead wire 107 is electrically connected to the circuit board 85 housed in the bottom member 75.

The reason for this construction is that the inner container 73 is a double-bottomed container having a bottom with no holes, and a lead wire insertion hole can be formed at the bottom of the inner container 73. Because there is no. Since the lead wire 107 guided along the inner side surface of the inner unit 76 is housed in the vertical groove 141, the lead wire 107 does not protrude from the inner surface of the inner unit 76, and the inner unit 76 and the inner pot 84 It is not necessary to form a particularly large gap between and. Further, since the gap between the inner container 76 and the inner container 84 may remain small, the heat generated by the rice cooking heater unit 83 can be effectively transferred from the peripheral side surface of the inner pan 84 to the inner pan 84.

Further, as shown in FIG. 11, since the lead wire 107 is housed in the vertical groove 141 and is covered with the lead wire cover 143, even if the inner pot 84 is frequently taken in and out. There is no intention of hooking the lead wire 107 or damaging the lead wire 107. The lead wire cover 143 may be omitted and a wiring structure may be adopted in which the lead wire 107 is fixed in the vertical groove 141 with an adhesive or the like.

The lead wire of the temperature sensor 80 is wired in the same manner as the lead wire 107. In the embodiment shown in FIG. 9, the end 108 of the rice cooking heater 82 is bent outward in the lateral direction, and the lead wire 107 is connected to the end 108. By bending and arranging in the horizontal direction, the storage space of the rice cooking heater unit 83 can be made lower. The end 108 of the rice cooking heater 82 may be bent laterally inward.

FIG. 12 is a schematic sectional view showing a heat retaining heater mounting structure suitable for an electric rice cooker having an inner container of stainless steel vacuum double structure according to an embodiment of the present invention. When a stainless vacuum double structure inner container is adopted, the heat generated by the heat retaining heater will be generated inside the inner container even if the heat retaining heater is wrapped around the outer surface of the inner container as in the case of the conventional single plate inner container. Therefore, there is no effect of providing a heat insulation heater.

Therefore, when the inner container having the stainless steel vacuum double structure is adopted, it is necessary to devise a mounting structure of the heat insulation heater. In FIG. 12, a dedicated pan bottom container 152 is provided for attaching the heat retention heater 151. The pan bottom container 152 is disposed below the inside of the contents container 5, and a heat insulation heater 151 is attached to the upper edge of the pan bottom container 152. The pot bottom container 152 holds the warming heater 151, surrounds a part of the side and the lower part of the rice cooking heater unit 14, and divides a gap between the rice cooking heater unit 14 and the inner container 5 to separate the rice cooking heater unit 14 from the rice cooking heater unit 14. The heat generated is transferred to the inner pot more effectively.

In addition, it should be noted that the present invention can make various design changes within the scope of the claims.

[0034]

[Effect of the device]

 As described above, the present invention is equipped with a bottomed vacuum double structure inner container without holes, so the heat generated by the rice cooking heater does not escape to the lower part of the inner container, etc. Passed to the pot. Therefore, it is possible to provide an electric rice cooker with good rice cooking efficiency and heat retention efficiency.

Further, a so-called energy-saving type electric rice cooker that consumes less power during rice cooking can be provided.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view showing an overall configuration of an electric rice cooker according to an embodiment of the present invention.

FIG. 2 is a perspective view for explaining the structure of a shoulder member in the above embodiment.

FIG. 3 is a partial cross-sectional view for explaining the features of the electric rice cooker shown in FIG.

FIG. 4 is an exploded perspective view for explaining a mounting structure of a temperature sensor and a rice cooking heater unit.

5 is a cross-sectional view showing a specific structure of a temperature sensor 80. FIG.

FIG. 6 is a partial cross-sectional view for explaining another mounting structure of the temperature sensor and the rice cooking heater unit.

FIG. 7 is an exploded perspective view for explaining another mounting structure of the temperature sensor and the rice cooking heater unit.

FIG. 8 is a side partial cross-sectional view showing the structure of an electric rice cooker according to another embodiment of the present invention.

9 is a partial side sectional view showing a lead wire wiring structure applicable to each of the embodiments shown in FIGS. 1 to 6; FIG.

FIG. 10 is a lead wire insertion groove 14 formed in a shoulder member 74.
It is a perspective view showing 2.

FIG. 11 is a partial plan view taken along the line BB in FIG.

FIG. 12 is a schematic sectional view showing a mounting structure of a heat retaining heater applicable to the electric rice cooker according to the embodiment of the present invention.

[Explanation of symbols]

 71 rice cooker body 86 lid unit 84 inner pot 73 inner container 76 inner unit 77 outer unit 78 vacuum chamber 80 temperature sensor 60 temperature fuse

Claims (4)

[Scope of utility model registration request] 1. An electric rice cooker including an inner container for accommodating an inner pot, and a temperature sensor and a rice cooking heater provided at an inner bottom portion of the inner container, each inner container having a hole. It has a double structure of an inner unit and an outer unit in the shape of a container at the bottom, and the upper edges of the inner unit and the outer unit are joined, and the inside of the double structure is evacuated. An electric rice cooker characterized in that a fixture is provided on the bottom surface, and the fixture holds a temperature sensor and a rice cooker heater. 2. The electric rice cooker according to claim 1, wherein a vertical groove for accommodating a lead wire is formed in the inner unit from a bottom surface to an upper edge portion thereof, and the inner rice cooker is connected to a temperature sensor and a rice cooking heater. Lead wire
It is characterized in that it is wired in the vertical groove and guided to the outside of the inner container. 3. The electric rice cooker according to claim 1 or 2, wherein both the inner unit and the outer unit forming the inner container are made of metal. 4. The electric rice cooker according to claim 1, 2 or 3, further comprising a heat retaining function in the inner container.