JP2011075217A - Electric heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric heater which detects an abnormal state while cooling a body back face and stops heating operation. <P>SOLUTION: Air is made to flow from a lower ventilation hole 51 at the lower end of a back face panel 7 into the lower space 52 of a body case 3, pass through a draft ventilation passage 54 and flow out of an upper space 53 to the body case 3. Normally, air at a high temperature is made to pass through a communication part 56 of a heat shield plate 20 and flow into an uppermost space 55, and remaining is made to pass through an upper ventilation hole 50 at the upper end of the back face panel 7 and flow out outside the body case 3. Thus, since the back face panel 7 and a front face panel 6 are cooled, this prevents burn injury etc. even if the back face panel 7 and the front face panel 6 are touched. Normally, the temperature of the uppermost space 55 having no section from which high temperature air made to flow in comes out is increased, and when the temperature reaches temperature operating a thermistor 46, the abnormal condition can be detected so as to stop the heating operation. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an electric stove that can detect an increase in the temperature in an appliance during an abnormality while preventing the appliance body from becoming hot.

  Conventionally, in this type of electric stove, air is introduced from the air supply hole provided in the lower part of the back of the instrument body, and the ventilation path is formed to flow out of the ventilation hole provided in the upper part of the front of the instrument body through the back side of the reflector. There was one that prevented the temperature of the upper space of the instrument body from rising. (For example, patent document 1).

  In addition, an overheat protection element that cuts off the power supply to the heating element when the temperature exceeds a predetermined temperature is disposed near the upper end of the inside of the heat fixture body, so that if cloth or the like covers the front surface of the electric stove, it is released into the space. Some cloths ignited due to the heat that was supposed to be trapped in the stove. (For example, patent document 2).

JP 07-310932 A JP 2006-23033 A

  By the way, an overheat protection element that cuts off the power supply to the heating element when the temperature exceeds a predetermined temperature is arranged near the upper end portion inside the heater body, and a ventilation path is formed inside the appliance body to form an upper space of the appliance body. In the electric stove that prevents the temperature rise, even if the temperature inside the instrument body rises due to abnormalities, it is exhausted by the ventilation path, and the overheat protection element could not accurately detect the temperature rise due to abnormalities. .

  In order to solve the above-described problems, the present invention provides a heater, a reflector that covers the heater, a front panel to which a guard that covers the front surface of the heater is attached, and an upper portion and a lower portion that engage with the front panel. Is provided with a back panel in which a plurality of upper and lower vents are formed, and a main body case portion comprising an engaged front panel and an operation portion main body attached to the upper portion of the back panel. An upper space is formed, a lower space is formed in the lower portion of the main body case portion, and an uppermost space provided with a thermistor is formed above the upper space, and the upper space and the lower space are formed with a back panel. The uppermost space and the upper space are communicated with each other by a communicating portion of a heat shield plate provided at the boundary thereof.

  According to a second aspect of the present invention, in the electric stove according to the first aspect, an upper heat radiating plate in which a plurality of heat radiating holes communicating with the upper space are formed on the upper portion of the front panel.

  According to the first aspect of the present invention, when the heating operation is started, the heater is energized to increase the temperature of the heater, thereby increasing the temperature of the upper space of the main body case portion. The air flows into the lower space of the main body case part, and the inflowed air is drafted and flows into the upper space through the draft air passage, and passes through the upper air hole at the upper end of the rear panel from the upper space where the air flows. The back panel is always cooled, so there is no burns when touching the back panel, and there is no heat buildup in the upper space, so the temperature in the top space does not rise significantly. In addition, the upper front panel does not become hot and does not cause burns when touched, and the temperature of the thermistor in the uppermost space can be lowered during normal heating operation. In which it can prevent malfunction caused by gradual temperature changes as ambient temperature changes by a possible increase Noboriritsu.

  Also, when towels fall on the main body of the electric stove, the hot air passes through the communication part of the heat shield and flows into the uppermost space, and the rest is at the top of the rear panel. Since the high temperature air that has flowed into the uppermost space has no place to escape, the temperature of the uppermost space rises and the thermistor operates. When the temperature is reached, the thermistor detects an abnormality, stops energization of the heater, and can stop the heating operation.

  Also, with this electric stove that detects the abnormal condition that the towel has fallen on the main body of the electric stove with the rate of temperature rise per unit time, the thermistor's ambient temperature is lowered during normal operation and quickly when abnormal The ambient temperature of the thermistor can be raised to reliably detect an abnormal state and the heating operation can be safely stopped.

  Also, even during abnormal conditions, some of the hot air that has flowed into the upper space passes through the upper vents at the upper end of the rear panel and flows out of the case of the main unit. It can prevent extremely high temperatures.

  According to the electric stove described in claim 2 of the present invention, in the electric stove of claim 1, when the heating operation is started, the heater is energized and the temperature of the heater rises. Although the temperature rises, the upper space into which the air flows into the lower space of the main body case part from the lower ventilation hole at the lower end of the rear panel, and the introduced air is drafted and flows into the upper space through the draft ventilation passage. Since it flows out to the main body case through the upper ventilation hole at the upper end of the rear panel and the upper radiator plate, the rear panel is always cooled, so there is no burn even if you touch the rear panel, Since no heat is trapped in the upper space, the temperature of the uppermost space does not rise significantly, and the upper front panel does not become hot and does not burn when touched. Can lower the ambient temperature during normal heating operation of the static, in which can prevent malfunction caused by gradual temperature changes as ambient temperature varies can be increased the temperature rise rate during abnormally high temperature.

  Also, if a towel or the like falls on the main body of the electric stove, the hot air rises between the towel and the guard and flows into the upper space from the heat dissipation hole of the upper heat sink. Part of the hot air that has flowed into the upper space passes through the communication part of the heat shield and flows into the uppermost space, and the rest passes through the upper vent hole at the upper end of the rear panel and flows out of the main body case. Therefore, at this time, there is no place for the hot air flowing in the top space to escape, so when the temperature of the top space rises and reaches the temperature at which the thermistor operates, the thermistor detects an abnormality and It is possible to stop energization and stop the heating operation.

  Also, with this electric stove that detects the abnormal condition that the towel has fallen on the main body of the electric stove with the rate of temperature rise per unit time, the thermistor's ambient temperature is lowered during normal operation and quickly when abnormal The ambient temperature of the thermistor can be raised to reliably detect an abnormal state and the heating operation can be safely stopped.

  Also, even during abnormal conditions, some of the hot air that has flowed into the upper space passes through the upper vents at the upper end of the rear panel and flows out of the case of the main unit. It can prevent extremely high temperatures.

The perspective view of the electric heater which attached | subjected one Example of this invention. The same side view. FIG. Explanatory drawing which shows the normal operation state. Explanatory drawing which shows the abnormal operation state.

  Next, an embodiment of the present invention will be described with reference to FIG.

  Reference numeral 1 denotes an electric stove, which is an elliptical plan view and is generally referred to as a cylindrical tower type, and a cylindrical main body case portion 3 having a single heater 2 and a main body case portion 3 having a diameter larger than that of the main body case portion 3. The main body case portion 3 includes a front panel 6 to which a guard 5 that includes a heater 2 and covers a front surface of the heater 2 is attached, and a front panel 6. The rear panel 7 is joined, the front panel 6 is engaged, and the operation unit main body 8 is attached to the upper part of the rear panel 7.

  The heater 2 is made of stainless steel sheathed heater tube with a black ceramic coating, which emits a large amount of 3-20 micron far-infrared rays to warm it from the body's shin, and is resistant to impact and has excellent durability. The heat generating part 10 is configured together with the reflector 9 and the guard 5 that reflect heat.

  The operation unit body 8 is provided with a display unit 11 for displaying the heating capacity at the upper front portion, and an operation unit 12 is provided on the upper surface. The operation unit 12 is a rotary type that sets on / off of heating operation and heating capacity. An operation knob 13, a fluctuation operation switch 14 that raises or lowers the heating capacity within a certain range, a turn-off timer switch 15 that can set an operation time from 30 minutes to 1 to 3 hours, and a swing switch 16 that swings the main body case 3. It is what has.

  Further, an operation unit reinforcing plate 19 to which a display unit substrate 17 for controlling the display unit 11 and an operation unit substrate 18 having a microcomputer for controlling the operation unit 12 and various modes is attached is installed in the operation unit main body 8. A heat shield plate 20 having a substantially crank-shaped cross section is provided at the boundary between the operation portion reinforcing plate 19 and the upper portion of the rear panel 7.

  The operation unit board 18 is fixed with a tipping switch 21 composed of a container having a ball (not shown) and a contact. When the electric stove 1 is tilted at 45 ° C. or more in any direction, it is judged that the tipping over is turned off. It is to ensure safety.

  The lower part of the main body case 3 surrounded by the front panel 6 and the rear panel 7 is fixed to the base 4 with screws, and one end of the swing shaft 22 when the main body case 3 swings. A swinging shaft support 23 that is rotatably supported is fixed to the base portion 4 with a screw. A main body case portion 3 is placed on the swinging shaft support 23 and a link portion 24 that causes the main body case portion 3 to swing. A motor mounting base 26 to which a swing motor 25 for operating the link portion 24 is attached is rotatably attached.

  A temperature detection means 27 is further provided in the lower part of the main body case 3 surrounded by the front panel 6 and the back panel 7, and this temperature detection means 27 detects the room temperature in the normal state of the inverted state. When the room temperature is less than 10 ° C., the output of 340 W to 900 W is usually reduced to 170 W to 680 W, when the room temperature is less than 10 ° C. to 20 ° C., it is reduced to 120 W to 630 W, and when the room temperature is 20 ° C. or more, it is reduced to 120 W to 520 W. It also serves as a room temperature sensor during operation in the energy saving mode, and when the electric stove 1 as a tool is turned on and the heat generating part 10 is turned over with the floor side, the overturn switch 21 causes a malfunction such as a failure. Since the large-diameter base portion 4 protrudes at least in front of the main body case portion 3, the main body case portion 3 is inclined upward toward the base portion 4. Therefore, the hot air from the heat generating part 10 is concentrated in the lower part of the main body case part 3 surrounded by the front panel 6 and the rear panel 7 provided with the temperature detecting means 27, and inside the rear panel 7. The temperature detection means 27 instantaneously detects a predetermined temperature, ie, 50 ° C. or higher, and shuts off the power supply of the electric stove 1 as a tool. is there.

  Reference numeral 28 denotes a substantially box-shaped substrate holder, which is fixed to the lower portion of the back panel 7 so as to be positioned on the upper portion of the swing motor 25, and includes a substrate storage portion 30 for storing the main substrate 29, and an upper portion of the substrate storage portion 30. The cord insertion portion 32 is configured to guide the power cord 31. The cord insertion portion 32 has an upper insertion portion 33 that is inclined downward from the back to the front, and a front front portion that is tapered downward. And a lower insertion portion 34 formed between the upper insertion portion 32 and the lower insertion portion 34, and a horizontally long hole-like insertion port 35 into which the power cord 31 is inserted on the back side from the front. It is what.

  The swing shaft support 23 has a cylindrical shape with a bottom, a power cord engaging portion 36 that engages with the power cord 31 is formed on the side surface, and a swing bearing portion 37 into which one end of the swing shaft 22 is inserted on the upper surface. The ratchet pin receiving portion 39 into which the ratchet pin 38 of the link portion 24 is inserted, and the power cord 31 engaged by the power cord engaging portion 36 pass through the swing shaft support 23 and the front side of the main body case portion 3. A power cord support portion 40 is formed which stands up from the swing shaft support 23 and protrudes upward from the swing shaft support 23 and supports the power cord 31 protruding upward.

  The power cord 31 enters the swing shaft support 23 from the back side of the swing shaft support 23 and protrudes upward from a power cord support portion 40 formed to protrude from the front upper surface of the swing shaft support 23. However, the protruding position is the same as the center of the width of the main body case portion 3, and from there, it is inserted into the insertion port 35 of the substrate holder 28 located above the swing shaft support 23, and further penetrates the insertion port 35. The tip of the power cord 31 that protrudes to the opposite side of the substrate holder 28 is connected to a connector in the vicinity of the center of rotation when the main case 3 is swung on the main substrate 29 in the substrate holder 28. is there.

  The front panel 6 includes an upper front panel 41 and a lower front panel 42 having a substantially U-shaped cross section, and an upper radiator plate 43 having a substantially U-shaped cross section is provided below the upper front panel 41. In addition, a lower heat radiating plate 44 having a substantially U-shaped cross section is provided above the lower front panel 42, and a plurality of elongated heat radiating holes 45 are formed in the front portion of the upper heat radiating plate 43. It is what.

  An upper reinforcing plate 47 to which a thermistor 46 for detecting an abnormal temperature is attached is assembled to the lower portion of the operation portion reinforcing plate 19, and an upper heater for fixing the upper end portion of the heater 2 to the lower portion of the upper heat radiating plate 43. A mounting plate 48 is provided, and a lower heater mounting plate 49 for fixing the lower end portion of the heater 2 is provided above the lower heat radiating plate 44.

  In addition, a plurality of elongated upper vent holes 50 and lower vent holes 51 are formed at the upper and lower ends of the rear panel 7, and the rear panel 7, the lower front panel 42, the lower radiator plate 44, and the lower heater mounting plate 49 are formed. The lower space 52 is formed by the rear panel 7, the heat shield plate 20, the upper heat radiating plate 43, and the upper heater mounting plate 48, and the upper space 53 and the lower space 52 are connected to the rear panel 7. The draft air passage 54 formed by the reflecting plate 9 communicates with the air, and the air that has flowed into the main body case 3 from the lower air hole 51 rises through the draft air passage 52 and passes through the upper end of the rear panel 7. It flows from the upper ventilation hole 50 to the outside of the main body case 3.

  Above the upper space 53, an uppermost space 55 is formed by the heat shield plate 20, the upper front panel 41, and the upper reinforcing plate 47 to which the thermistor 46 is attached. A communication portion 56 that connects the upper space 53 and the uppermost space 55 is formed, and the upper end of the heater 2 is positioned in the vicinity of the communication portion 56.

Next, the heating operation in a normal state will be described.
As shown in FIG. 4, when heating operation is started by rotating the operation knob 13 of the operation unit 12, the heater 2 is energized, far infrared rays are emitted from the heater 2, and the temperature of the heater 2 rises.

  As a result, the temperature of the upper space 53 of the main body case portion 3 rises, and air flows into the lower space 52 of the main body case portion 3 from the lower vent 51 at the lower end of the back panel 7 as shown by the solid line. The drafted air is drafted and flows into the upper space 53 through the draft air passage 54, and passes through the upper air hole 50 at the upper end of the rear panel 7 and the heat radiating hole 45 of the upper heat radiating plate 43 from the flowed upper space 53. It flows out of the part 3.

  As a result, the back panel 7 is always cooled, so that even if the back panel 7 is touched, there is no burn or the like, and no heat is accumulated in the upper space 53, so that the temperature of the uppermost space 55 is also significantly increased. In addition, the upper front panel 41 does not become hot and does not burn when touched, and the ambient temperature during normal heating operation of the thermistor 46 in the uppermost space 55 can be lowered. By increasing the rate of increase, it is possible to prevent malfunctions due to gradual temperature changes such as room temperature changes.

Next, stoppage of the heating operation in an abnormal state will be described.
As shown in FIG. 5, when the towel 57 falls on the main body of the electric stove, the hot air rises between the towel 57 and the guard 5 as shown by the dotted line. Then, it flows into the upper space 53 from the heat radiating hole 45 of the upper heat radiating plate 43.

  Part of the high-temperature air that has flowed into the upper space 53 passes through the communication portion 56 of the heat shield plate 20 and flows into the uppermost space 55, and the rest passes through the upper vent hole 50 at the upper end of the back panel 7 and passes through the main body. It flows out of the case part 3.

  At this time, since the high temperature air that has flowed in has no place to escape from the uppermost space 55, when the temperature of the uppermost space 55 rises and reaches the temperature at which the thermistor 46 operates, the thermistor 46 detects an abnormality and the heater 2 Is stopped, and heating operation is stopped.

  With this electric stove that detects the abnormal state that the towel 57 has fallen on the main body of the electric stove by this and the temperature rise rate per unit time, the ambient temperature of the thermistor 46 is lowered at the normal time, The ambient temperature of the thermistor 46 can be quickly raised to reliably detect an abnormal state and safely stop the heating operation.

  Further, even in an abnormal state, a part of the high-temperature air flowing into the upper space 53 passes through the upper vent 50 at the upper end of the rear panel 7 and flows out of the main body case portion 3. 7 and the upper space 53 can be prevented from becoming extremely high temperature.

2 Heater 3 Body Case 5 Guard 6 Front Panel 7 Back Panel 8 Operation Body 9 Reflector 20 Shielding Plate 46 Thermistor 50 Upper Vent 51 Lower Vent 52 Lower Space 53 Upper Space 54 Draft Ventilation Path 55 Uppermost Space 56 Communication Part

Claims (2)

  A heater, a reflector that covers the heater, a front panel to which a guard that covers the front surface of the heater is attached, and a rear surface that engages with the front panel and has a plurality of upper and lower vents formed in the upper and lower portions. A main body case portion including a panel and an operating portion main body attached to an upper portion of the front panel and the rear panel engaged with each other. An upper space is formed in an upper portion of the main body case portion, and a lower space is formed in a lower portion of the main body case portion. Further, an uppermost space provided with a thermistor is formed above the upper space, and the upper space and the lower space are communicated by a draft air passage formed by a back panel and a reflector, An electric stove characterized in that the uppermost space and the upper space are communicated by a communicating portion of a heat shield plate provided at the boundary.   2. The electric heater according to claim 1, wherein an upper heat radiating plate having a plurality of heat radiating holes communicating with the upper space is provided at an upper portion of the front panel.

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