JP2008111572A - Electric stove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent firing of cloth and the like when the cloth and the like covers over a heater main body. <P>SOLUTION: A top panel 30 is disposed over the whole face of a top face of a heater main body 12 at an upper end portion of the electric stove. Micro switches 32, 33 disposed on positions corresponding to both end portions of the top panel 30 are disposed between the top panel 30 and a casing 23. At least one of the micro switches 32, 33 is switched from an off-state to an on-state, when the cloth and the like hovers over from an upper part of the heater main body, and the load received by the top panel 30 from the external is more than a prescribed value. Here, it is judged that the cloth and the like covers over the heater main body 12 from the upper part, and the power supply to a sheath heater is stopped. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric heater provided with a heater main body having a heating element.

2. Description of the Related Art Conventionally, a floor-standing electric stove equipped with a heating element such as a sheathed heater or a quartz tube heater has been used for heating in a home, store, or office. Patent Document 1 describes an electric heater provided with a heater body having a sheathed heater. In this electric stove, a thermal fuse is arranged near the upper end inside the heater body, and when a cloth or the like covers the heater body and the surrounding temperature rises to a predetermined temperature, By cutting off the power supply, the cloth or the like can be prevented from igniting.
JP 2006-38238 A

  Some electric stoves have an output adjustment function, and the user can adjust the output of the sheathed heater by setting one output level among, for example, 10 output levels. In an electric stove equipped with such an output adjustment function, if the output level set by the user is different, the time until the thermal fuse operates is the same when a cloth or the like covers the heater body. It is thought that it does not become.

  Therefore, a main object of the present invention is to provide an electric stove that can reliably prevent the cloth or the like from igniting when the cloth or the like covers the heater main body.

  An electric stove according to a first aspect of the present invention includes a heater body having a heating element, a reflecting plate that reflects heat of the heating element forward, a casing to which the heating element and the reflecting plate are attached, and the heater A load detecting means for detecting an external load on the outer peripheral surface of the main body, and a power control means for controlling the power supply to the heating element, wherein the power control means is configured to detect a load detected by the load detecting means. When it is equal to or greater than a predetermined value, the power supply to the heating element is stopped.

  In this electric stove, by detecting the load acting from the outside on the outer peripheral surface of the heater body, it is directly detected that the cloth has been covered so as to cover the heater body, and the power supply to the heating element is stopped. can do. Therefore, when the cloth or the like is covered so as to cover the heater main body, it is possible to reliably prevent the cloth or the like from igniting, so that the safety of the electric stove is improved.

  An electric stove according to a second aspect is the electric stove according to the first aspect, wherein the load detecting means detects an external load on the upper surface of the heater body.

  With this electric stove, it is possible to reliably detect that a cloth or the like has covered the heater body from above.

  An electric stove according to a third aspect is the electric stove according to the second aspect, wherein the load detecting means is capable of detecting a load from the outside over the entire upper surface of the heater body.

  In this electric stove, since a load from the outside can be detected in a wide range of the upper surface of the heater main body, it is possible to more reliably detect that a cloth or the like has been covered so as to cover the heater main body from above.

  An electric stove according to a fourth aspect of the present invention is the electric stove according to the second aspect of the present invention, wherein the load detecting means is disposed at an upper end portion of the heater main body and receives a load from the outside, A switch that is disposed between the force receiving portion and the casing and that switches from an off state to an on state when an external load received by the force receiving portion exceeds a predetermined value.

  In this electric stove, the configuration for detecting that a cloth or the like has covered the heater main body from above can be simplified.

  An electric stove according to a fifth invention is the electric stove according to the fourth invention, wherein the load detecting means has two switches, and the two switches are both ends of the force receiving portion. It is arranged in the vicinity.

  In this electric stove, it is possible to reliably detect an external load received by the force receiving portion with as few switches as possible.

  An electric stove according to a sixth aspect of the present invention is the electric stove according to the first aspect of the present invention, further comprising a rotating mechanism that changes the vertical and horizontal directions of the heater body, and the load detecting means is arranged in the vertical direction. An external load is detected on the changed upper surface of the heater body, and an external load is detected on the changed upper surface of the heater body.

  With this electric stove, it is possible to reliably detect that a cloth or the like has been covered so as to cover the heater main body portion regardless of whether the heater main body portion is in the vertical orientation or the horizontal orientation.

  An electric stove according to a seventh aspect is the electric stove according to the sixth aspect, wherein the load detecting means is capable of detecting a load from the outside over the entire upper surface of the heater main body portion changed in the vertical direction. In addition, it is possible to detect a load from the outside over the entire upper surface of the heater main body that has been changed in the horizontal direction.

  In this electric stove, since a load from the outside can be detected in a wide range of the upper surface of the heater main body, it is possible to more reliably detect that a cloth or the like has been covered so as to cover the heater main body from above.

  An electric stove according to an eighth invention is the electric stove according to the sixth invention, wherein the load detecting means is disposed at an upper end portion of the heater main body portion changed in the vertical direction, and receives an external load. A first force receiving portion that is received, a second force receiving portion that is disposed on an upper end portion of the heater main body portion that is changed sideways, and receives a load from the outside, and between the first force receiving portion and the casing A first switch that switches from an off state to an on state when an external load received by the first force receiving portion reaches a predetermined value or more, and is disposed between the second force receiving portion and the casing; And a second switch that switches from an off state to an on state when an external load received by the second force receiving portion exceeds a predetermined value.

  In this electric stove, the configuration for detecting that a cloth or the like has covered the heater main body from above can be simplified.

  An electric stove according to a ninth aspect is the electric stove according to the eighth aspect, wherein the load detecting means includes two first switches, and the two first switches are the first ones. The power receiving unit is disposed in the vicinity of both ends of the force receiving portion, and has the two second switches, and the two second switches are disposed in the vicinity of both ends of the second power receiving portion.

  In this electric stove, it is possible to reliably detect an external load received by the first force receiving portion or the second force receiving portion with as few switches as possible.

  An electric heater according to a tenth invention is the electric heater according to any one of the first to ninth inventions, wherein the power control means stops the power supply to the heating element, and then the load detection means. When the load detected in (1) becomes less than a predetermined value, power supply to the heating element is started.

  With this electric stove, heating can be automatically restarted when the cloth or the like covering the heater body is removed.

  As described above, according to the present invention, the following effects can be obtained.

  In the first invention, by detecting a load acting from the outside on the outer peripheral surface of the heater main body, it is directly detected that the cloth or the like has been covered so as to cover the heater main body, and power is supplied to the heating element. Can be stopped. Therefore, when the cloth or the like is covered so as to cover the heater main body, it is possible to reliably prevent the cloth or the like from igniting, so that the safety of the electric stove is improved.

  In 2nd invention, it can detect reliably that cloth etc. covered so that the heater main-body part might be covered from upper direction.

  In the third invention, since a load from the outside can be detected in a wide range of the upper surface of the heater main body, it can be detected more reliably that a cloth or the like covers the heater main body from above.

  In 4th invention, the structure for detecting that cloth etc. covered so that a heater main-body part might be covered from upper direction can be simplified.

  In the fifth invention, it is possible to reliably detect the external load received by the force receiving portion with the fewest possible switches.

  In the sixth invention, it is possible to reliably detect that a cloth or the like covers the heater main body portion from above even when the heater main body portion is in the vertical orientation or in the horizontal orientation.

  In the seventh invention, since a load from the outside can be detected in a wide range of the upper surface of the heater body, it is possible to more reliably detect that a cloth or the like covers the heater body from above.

  In the eighth invention, it is possible to simplify the configuration for detecting that a cloth or the like covers the heater body from above.

  In the ninth aspect of the invention, it is possible to reliably detect an external load received by the first force receiving portion or the second force receiving portion with as few switches as possible.

  In the tenth invention, heating can be automatically restarted when the cloth or the like covering the heater body is removed.

  Embodiments of an electric heater according to the present invention will be described below with reference to the drawings. 1 to 5 are a perspective view of an electric heater according to an embodiment of the present invention as seen from the front side, a perspective view as seen from the rear side, a side view, a front view, and a plan view. 6A and 6B are enlarged views of the vicinity of the upper end portion and the vicinity of the right side surface of the heater body. FIG. 7 is a diagram illustrating the operation unit. 8 and 9 are a side sectional view and a front sectional view showing the internal structure of the heater body. FIG. 10 is a block diagram illustrating a configuration of the control unit.

[Configuration of the entire electric heater]
The electric stove 1 includes a stand base 11, a heater main body 12, a main body column 13, a heater angle changing mechanism 14, a heater swing mechanism 15, and a handle 16.

  The stand base 11 is installed on the floor G. On the upper side of the stand base 11, a quadrangular prism-shaped bulging portion 17 in which the heater swing mechanism 15 is built in the internal space is formed. The main body column 13 is an elongated rectangular tube-shaped member provided so as to protrude upward from the stand base 11 (specifically, the bulging portion 17).

  The heater body 12 includes a substantially rectangular parallelepiped casing 23 having a substantially rectangular opening on the front surface, a protection bar 24 provided on the front surface of the casing 23, and a sheathed heater 21 as a heating element disposed in the casing 23. The reflector 22 is disposed behind and to the side of the sheathed heater 21 and reflects the heat of the sheathed heater 21 forward. The main body column 13 is disposed behind the heater main body 12.

  A top plate 30 is disposed on the upper surface of the heater body 12 (specifically, the upper end portion of the casing 23). The top plate 30 is disposed over the entire upper surface of the heater body 12. Further, as shown in FIG. 6A, the two microswitches 32 and 33 are located between the top plate 30 and the casing 23 at the center in the width direction of the top plate 30 and corresponding to both ends in the longitudinal direction. Has been placed.

  The top panel 30 is provided with an operation unit 40. As shown in FIG. 7, the operation unit 40 includes an output adjustment unit 41 for adjusting the output of the sheathed heater 21. In the present embodiment, the output adjustment unit 41 can set any one of 10 output levels. Therefore, in the electric heater 1, the electric power supplied to the sheathed heater 21 is controlled based on the output level set by the output adjustment unit 41.

  A side plate 31 is disposed on the right side surface of the heater body 12. The side plate 31 is disposed over the entire right side surface of the heater body 12. Here, the right side surface of the heater main body 12 on which the side plate 31 is disposed is a surface that becomes the upper surface of the heater main body 12 when the heater main body 12 is sideways. Further, as shown in FIG. 6B, the two microswitches 34 and 35 are arranged between the side plate 31 and the casing 23 at the center in the width direction of the side plate 31 and corresponding to both ends in the longitudinal direction. Has been.

  The micro switches 32 and 33 are for detecting an external load received by the top plate 30, and the micro switches 34 and 35 are for detecting an external load received by the side plate 31. Each of the microswitches 32 to 35 is in an off state when the external load received by the top plate 30 or the side plate 31 is less than a predetermined value, and the external load received by the top plate 30 or the side plate 31 is a predetermined value or more. If the load from the outside received by the top plate 30 or the side plate 31 becomes less than a predetermined value, the ON state is switched to the OFF state. Here, in the present embodiment, when the external load received by the top plate 30 or the side plate 31 is a predetermined value or more, the cloth or the like covers the top plate 30 or the side plate 31 of the heater body 12 from above. The predetermined value is preferably set based on the weight of the cloth or the like because it is determined that the cover is covered. In the present embodiment, when the external load received by the top plate 30 is 0.15 kgf or more, at least one of the micro switches 32 and 33 is switched from the off state to the on state, and the external force received by the side plate 31 is changed. When the load is 0.15 kgf or more, at least one of the micro switches 34 and 35 is switched from the off state to the on state.

  Specifically, when the heater main body 12 is in the vertical orientation (see FIG. 6A), if the cloth or the like covers the top board 30 of the heater main body 12 from above, the top board 30 is caused by the weight of the cloth or the like. A downward load acts on the top plate 30 and the top plate 30 moves downward (including a case where the top plate 30 is horizontal and a case where the top plate 30 is inclined). And when the external load which the top plate 30 receives is less than predetermined value, both the microswitches 32 and 33 are maintained in an OFF state. On the other hand, when the external load received by the top board 30 is equal to or greater than a predetermined value, at least one of the micro switches 32 and 33 is switched from the off state to the on state. As described above, it is possible to detect that a cloth or the like covers the heater body 12 from above based on the fact that at least one of the micro switches 32 and 33 is switched from the off state to the on state. Accordingly, the microswitches 32 and 33 are each set with a load for switching from the off state to the on state so that it can be detected that the external load received by the top board 30 is greater than or equal to a predetermined value. Further, when the heater body 12 is in the horizontal direction, the side plate 31 is the upper surface of the heater body 12, and the same can be considered.

  In addition, two temperature fuses 51 and 52 are arranged inside the heater body 12. As shown in FIGS. 8 and 9, the thermal fuse 51 is installed in the vicinity of the upper end portion of the heater body 12 when the heater body 12 is vertically oriented (solid line shown in FIG. 4). The thermal fuse 51 cuts off the power supply to the sheathed heater 21 when the ambient temperature rises to a predetermined temperature, and has an operating temperature (heat resistant temperature) of 119 ° C.

  The thermal fuse 52 is installed near the upper end portion inside the heater body 12 when the heater body 12 is in the horizontal direction (two-dot chain line shown in FIG. 4) and between the back surface side of the reflector 22 and the casing 23. Has been. Similar to the thermal fuse 51, the thermal fuse 52 is used to shut off the power supply to the sheathed heater 21 when the ambient temperature rises to a predetermined temperature, and has an operating temperature of 154 ° C. . The operating temperature of the thermal fuse 52 is different from the operating temperature of the thermal fuse 51 because the mounting position of the thermal fuse 52 is immediately behind the reflector 22, so Is also due to the high temperature.

  In addition, the operating temperature of the thermal fuses 51 and 52 is based on the result of the ignition experiment performed by covering the heater body 12 with the cloth, and the temperature inside the heater body 12 when the cloth ignites in the ignition experiment. The temperature is set to be lower than that. Therefore, even when a cloth or the like covers the heater body 12, the thermal fuses 51 and 52 are activated before the cloth or the like is ignited to cut off the power supply to the sheathed heater 21. Can be prevented. Further, when a cloth or the like covers the heater main body 12, the temperature of the upper end of the heater main body 12 is likely to rise. Therefore, the thermal fuses 51 and 52 are oriented horizontally even when the heater main body 12 is in the vertical orientation. Even in this case, it is arranged near the upper end of the heater body 12.

  The heater angle changing mechanism 14 is disposed between the heater main body 12 and the main body column 13 (more specifically, between the longitudinal center of the heater main body 12 and the upper portion of the main body column 13). An elevation angle changing function for changing the elevation angle (see the heater body 12 shown by the elevation angle α and the one-dot chain line in FIG. 3) and the depression angle (see the heater body 12 shown by the depression angle β and the two-dot chain line in FIG. 3); The heater main body 12 has a vertical / horizontal change function for changing the vertical / horizontal direction of the heater main body 12 (see the heater main body 12 shown by the rotation angle γ and the two-dot chain line in FIG. 4).

  The heater swing mechanism 15 is disposed between the main body column 13 and the stand base 11, and manually rotates the main column 13 within a range of a predetermined swing angle (swing angle ε in FIG. 5). A manual swing function for swinging the heater main body 12 by means of the main swing of the main body support 13 and a predetermined swing angle (the swing angle δ and two of FIG. 5) with reference to the position of the swing angle set by the manual swing function. It has an automatic swing function for swinging the heater main body 12 by automatically and repeatedly rotating within the range of the heater main body 12 illustrated by the dotted line.

[Configuration of control unit of electric heater]
As shown in FIG. 10, the control unit 70 of the electric stove 1 includes a data storage unit 71 and a power control unit 72. The control unit 70 is connected to the output adjustment unit 41 of the operation unit 40, the sheathed heater 21, and the micro switches 32 to 35.

  The data storage unit 71 stores various data related to the control of the electric heater 1. In the present embodiment, the data storage unit 71 stores the power value supplied to the sheathed heater 21 at each of the 10 output levels that can be set by the output adjustment unit 41.

  The power control unit 72 controls the power supplied to the sheathed heater 21. That is, the power control unit 72 normally supplies power to the sheathed heater 21 according to the power value obtained based on the data stored in the data storage unit 71 with respect to the predetermined output level set by the output adjustment unit 41. Supply. Further, the power control unit 72 stops the power supply to the sheathed heater 21 when any of the micro switches 32 to 35 is switched from the off state to the on state. Furthermore, the power control unit 72 starts power supply to the sheathed heater 21 when all of the micro switches 32 to 35 are turned off after stopping the power supply to the sheathed heater 21.

[Characteristics of the electric heater of the present invention]
The electric heater 1 of the present embodiment has the following characteristics.

  In the electric stove 1 of the present embodiment, it is directly determined that a cloth or the like is covered so as to cover the heater body 12 based on the state of the microswitches 32 to 35 disposed on the upper end portion and the side surface portion of the heater body 12. The power supply to the sheathed heater 21 can be stopped. Therefore, when a cloth or the like covers the heater body 12, the cloth or the like can be reliably prevented from igniting, so that the safety of the electric stove 1 is improved.

  Moreover, in the electric stove 1 of this Embodiment, when the heater main body 12 is vertical orientation, the external load which the top plate 30 used as an upper surface receives can be detected from the state of the microswitches 32 and 33, When the heater body 12 is sideways, the external load received by the side plate 31 on the upper surface can be detected from the state of the microswitches 34 and 35. Therefore, whether the heater main body 12 is in the vertical direction or in the horizontal direction, it is possible to reliably detect that the cloth or the like covers the heater main body 12 from above.

  Further, in the electric heater 1 of the present embodiment, when the heater main body 12 is oriented vertically, the top plate 30 can receive an external load over the entire upper surface of the heater main body 12. When 12 is sideways, the side plate 31 can receive a load from the outside over the entire upper surface of the heater body 12. Therefore, even when the heater main body 12 is in the vertical direction or in the horizontal direction, a load from the outside can be detected in a wide range on the upper surface of the heater main body 12, so that a cloth or the like covers the heater main body 12 from above. This can be detected more reliably.

  Moreover, in the electric stove 1 of this Embodiment, since the external load which the top plate 30 or the side plate 31 receives is detected based on the state of the microswitches 32-35, it covered so that cloth etc. might cover the heater main body. The configuration for detecting this can be simplified. Moreover, since the microswitches 32 and 33 are disposed at both ends of the top plate 30 and the microswitches 34 and 35 are disposed at both ends of the side plate 31, the top plate 30 or the side plate 31 is mounted by a microswitch as few as possible. The external load to be received can be reliably detected.

  Moreover, in the electric stove 1 of this Embodiment, after detecting that cloth etc. were covering so that the heater main body 12 might be covered, and stopping the electric power supply to the sheathed heater 21, all of the microswitches 32-35 are turned on. In the off state, power supply to the sheathed heater 21 is started. Therefore, heating can be automatically restarted when the cloth or the like covering the heater body 12 is removed.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described based on drawing, specific structure is not restricted to these embodiment, It can change in the range which does not deviate from the summary of invention.

  In the present invention, the present invention is not limited to the case where it is detected that a cloth or the like covers the heater body 12 based on the state of the microswitches 32 to 35 disposed on the heater body 12. By detecting an external load on the outer peripheral surface of the main body 12, it may be detected that a cloth or the like is covered so as to cover the heater main body 12.

  Further, the present invention is not limited to the case of detecting an external load on the upper surface of the heater body 12, and any part other than the upper surface of the heater body 12 can be detected as long as it can be detected that a cloth or the like has covered the heater body 12. A load from the outside may be detected. Even when a load from the outside is detected on the upper surface of the heater body 12, a load from the outside may be detected on a part of the upper surface of the heater body 12.

  By using the present invention, in an electric stove provided with a heater main body having a heating element, it is possible to reliably prevent the cloth from igniting when the cloth covers the heater main body. So the safety of the electric stove is improved.

It is the perspective view which looked at the electric heater which concerns on embodiment of this invention from the front side. It is the perspective view which looked at the electric heater of FIG. 1 from the rear surface side. It is a side view of the electric heater of FIG. It is a front view of the electric heater of FIG. It is a top view of the electric stove of FIG. FIG. 6A is an enlarged view of the vicinity of the upper end portion of the heater body, and FIG. 6B is an enlarged view of the vicinity of the right side surface of the heater body. It is a figure which shows an operation part. It is a sectional side view which shows the structure inside the heater main-body part of the electric stove of FIG. It is front sectional drawing which shows the structure inside the heater main-body part of the electric stove of FIG. It is a block diagram which shows the structure of the control part of the electric stove of FIG.

Explanation of symbols

1 Electric heater 12 Heater body (Heater body)
14 Heater angle changing mechanism (rotating mechanism)
21 Seeds heater (heating element)
22 Reflecting plate 23 Casing 30 Top plate (first force receiving portion; load detecting means)
31 Side plate (second force receiving portion; load detecting means)
32, 33 Micro switch (first switch; load detection means)
34, 35 Micro switch (second switch; load detection means)
70 Control Unit 71 Data Storage Unit 72 Power Control Unit (Power Control Unit)

Claims (10)

A heating element (21), a reflection plate (22) for reflecting the heat of the heating element (21) forward, and a casing (23) to which the heating element (21) and the reflection plate (22) are attached. A heater body (12) having;
Load detecting means for detecting a load from the outside on the outer peripheral surface of the heater body (12);
Power control means (72) for controlling power supply to the heating element (21),
The electric heater (1), wherein the electric power control means (72) stops the electric power supply to the heating element (21) when the load detected by the load detection means is a predetermined value or more.   The electric stove (1) according to claim 1, wherein the load detecting means detects an external load on the upper surface of the heater body (12).   The electric stove (1) according to claim 2, wherein the load detection means is capable of detecting a load from the outside over the entire upper surface of the heater body (12). The load detection means includes
A force receiving portion (30) that is disposed at the upper end of the heater body (12) and receives a load from the outside;
A switch (32) disposed between the force receiving portion (30) and the casing (23), which switches from an off state to an on state when an external load received by the force receiving portion (30) exceeds a predetermined value. 33). Electric stove (1) according to claim 2, characterized in that; The load detection means includes
The two switches (32, 33) are provided, and the two switches (32, 33) are arranged near both ends of the force receiving portion (30). Electric stove (1) as described. A rotation mechanism (14) for changing the vertical and horizontal orientations of the heater body (12);
The load detecting means detects a load from the outside on the upper surface of the heater body (12) changed in the vertical direction and applies an external load on the upper surface of the heater body (12) changed in the horizontal direction. Electric stove (1) according to claim 1, characterized in that it detects.   The load detecting means is capable of detecting a load from the outside over the entire upper surface of the heater main body (12) changed in the vertical direction, and the entire upper surface of the heater main body (12) changed in the horizontal direction. The electric stove (1) according to claim 6, wherein a load from the outside can be detected. The load detection means includes
A first force receiving portion (30) that is disposed at an upper end portion of the heater main body portion (12) changed in a vertical direction and receives a load from the outside;
A second force receiving portion (31) that is disposed at an upper end portion of the heater main body portion (12) that has been changed sideways, and that receives a load from the outside;
It is arranged between the first force receiving part (30) and the casing (23), and when the external load received by the first force receiving part (30) exceeds a predetermined value, it switches from the off state to the on state. A first switch (32; 33) to be replaced;
When it is disposed between the second force receiving portion (31) and the casing (23) and the external load received by the second force receiving portion (31) exceeds a predetermined value, it switches from the off state to the on state. Electric stove (1) according to claim 6, characterized in that it comprises a second switch (34; 35) to be replaced. The load detection means includes
The first switch (32, 33) has two, and the two first switches (32, 33) are arranged near both ends of the first force receiving portion (30),
Two second switches (34, 35) are provided, and the two second switches (34, 35) are disposed near both ends of the second force receiving portion (31). The electric stove (1) according to claim 8.   The power control means (72) stops the power supply to the heating element (21), and when the load detected by the load detection means becomes less than a predetermined value, Electric stove (1) according to any one of the preceding claims, characterized in that the supply of electric power is started.

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