JP2007024331A - Electric stove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform multiple-stage operation while inexpensively switching heating capacities with a simple constitution without flickering a heating element, when a power distribution ratio of a heating element unit employing a carbon resistance heating element is controlled. <P>SOLUTION: This electric stove comprises a stove main body 21 opened at its front face, a reflecting plate 22 mounted in the stove main body, the heating element unit 25 composed of the carbon resistance heating element 24 mounted on a front part of the reflecting plate and a tubular body 23 covering an outer periphery of the resistance heating element, and a power distribution control means 27 for controlling the power distribution ratio to the heating element unit. As the power distribution control means 27 can distribute electric power to the heating element unit with an intermediate power distribution ratio between 1/2 power distribution and full power distribution besides two-stage switching of 1/2 power distribution and full power distribution, by controlling the power distribution ratio to alternately perform 1/2 power distribution and full power distribution by every constant time, the electric stove can be easily alternately switched stronger and weaker in multiple-stage. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric heater used for an electric heater.

  Conventionally, this type of electric stove heats the red heater by radiating heat from the red heater. Moreover, the intensity of the heat radiated from the red heat heater is switched by controlling the energization rate to the red heat heater. (For example, refer to Patent Document 1). In addition, some electric heaters using a plurality of heaters including a red-heated heater switch the intensity of radiant heat by changing the number of energized heaters (see, for example, Patent Document 2).

  FIG. 8 shows a conventional electric stove described in Patent Document 1. As shown in FIG. As shown in FIG. 8, the stove body 1, the reflector 2 provided inside the stove body 1, and the tube 4 covering the outer periphery of the carbon resistance heating element 3 and the carbon resistance heating element 3 in front of the reflection plate 2. And a circuit unit for controlling the energization rate.

FIG. 9 shows a conventional electric stove described in Patent Document 2. As shown in FIG. As shown in FIG. 9, an I-shaped heater 13 is disposed at the center of the reflector 12 disposed in the main body case 11, and inverted U-shaped heaters 14 are disposed on both sides so that heat can be evenly radiated from the main body case 11. At the same time, in the case of weak operation, only the I-shaped heater 14 that glows red is energized so that the operation is strong and weak.
JP 2002-267183 A Japanese Patent Laid-Open No. 10-73261

  However, in the former conventional configuration, the heating element unit 5 using one carbon-based resistance heating element 3 is used for the red heater, so that the heating element unit 5 is bright when energized, but immediately after the energization is stopped. In addition to being unsafe when it is turned off, it is unsafe, and the change in the feeling of heating due to turning on and off of electricity is large, making it difficult to use. For this reason, if the energization rate is controlled by phase control or the like so that the intensity of the radiant heat is switched in order to obtain an intermediate stage, there is a concern that the flickering of the heating element unit 5 is anxious. Therefore, in order to switch the intensity of the radiant heat so that the flickering of the heating element unit 5 does not matter, a method of obtaining an intermediate stage by using a half-wave rectifier and halving the current ratio is also used. The strong / weak switching used has a problem that only a two-stage switching between a weak operation with 1/2 energization and a strong operation with full energization is possible, and there are few switching steps. In addition, there is a method of controlling the voltage applied to the heating element unit 5 in order to perform multi-stage switching. In this case, a power transformer must be built into the product body, and the body size increases and the weight increases. It had the subject that the countermeasure against the heat generated from the power transformer had to be implemented.

  Further, in the latter conventional configuration, the I-shaped heater 13 and the inverted U-shaped heater 14 are used so that heat can be radiated evenly on the left and right, so that the main body size is increased and a plurality of heating elements are used, which is expensive. It had the problem that.

  The present invention solves the above-mentioned conventional problems. In an electric stove using a heating element unit using a carbon-based resistance heating element, a half-wave rectifier is used, and a plurality of heating element units are used. An object of the present invention is to provide an electric stove that can easily perform multi-stage switching operation without increasing the size.

  In order to solve the conventional problems, an electric stove according to the present invention includes a stove body having an open front surface, a reflector provided in the stove body, a carbon resistance heating element provided in front of the reflector, and a A heating element unit comprising a tubular body covering the outer periphery and a circuit unit for controlling the energization rate to the heating element unit, the energization rate of the circuit unit is alternately ½ energization and full energization at regular intervals. An energization control means is provided.

  As a result, the energization control means switches the energization rate to the heating element unit to alternate between 1/2 energization and full energization at regular intervals at long intervals where the flickering of the heating element unit is not a concern. In addition to the strong operation at the time of full energization and the weak operation of 1/2 energization, it is possible to perform the operation between them, and it is possible to perform multi-stage switching without using a power transformer or the like. In addition, since the heating element unit is operated at least weakly, the heating element unit is always red-hot, and it is easy to grasp that the electric stove is in operation, improving safety and always obtaining radiant heat and improving the feeling of heating. It becomes like this.

  The electric stove according to the present invention is an electric stove using a heating element unit using a carbon-based resistance heating element, and ½ energization is performed by energization rate control using a half-wave rectifier without using large parts such as a power transformer. By controlling the switching rate of all energizations, it is possible to perform multi-step strength switching with a simple configuration at low cost.

  According to a first aspect of the present invention, there is provided a stove body having an open front surface, a reflector provided in the stove body, a carbon resistance heating element provided in front of the reflector and a heating element unit comprising a tube covering the outer periphery thereof, And a circuit unit for controlling the energization rate to the body unit, and the circuit unit is provided with energization control means for alternately energizing the energization rate by half and full energization every predetermined time.

  Then, by changing the energization rate by the energization control means, it becomes possible to energize the heating element unit with the intermediate capacity between 1/2 energization and full energization, and it is possible to switch between 1/2 energization and full energization in two levels of strength. In addition, it is possible to add heating capacity switching in the meantime, and it is possible to switch the capacity of the electric stove in multiple stages at a low cost with a simple configuration. In addition, since the heating element unit is operated at least weakly, the heating element unit is always red-hot, and it is easy to grasp that the electric stove is in operation, improving safety and always obtaining radiant heat and improving the feeling of heating. It becomes like this.

  In the second invention, in particular, the change-over switch of the first invention is provided with a plurality of settings for switching intermediate energization obtained by alternately switching full energization and 1/2 energization every predetermined time at a predetermined switching rate. Timer means for controlling the energization control means according to the switching rate set by the changeover switch is provided.

  The intermediate energization obtained by alternately switching between full energization and 1/2 energization with a changeover switch can be switched at a predetermined switching rate, and a plurality of switching rates are set with the timer means of the energization control means. It is possible to energize the heating element unit at a plurality of switching rates between full energization and 1/2 energization, and the electric stove can be switched to more than 3 stages at a low cost with a simple configuration. It is possible to improve usability.

  According to a third aspect of the present invention, there is provided a switching time setting means for setting a switching time so that the user can set the time for alternately switching between full energization and half energization to the timer circuit of the first invention. It is.

  And since the switching time setting means for setting the switching time is arranged so that the user can set the time for alternately switching between full energization and 1/2 energization to the user's preference, The time for alternately switching between full energization and half energization can be set as desired, and it is possible to provide warmth that each user feels comfortable.

  In the fourth aspect of the invention, the fluctuation means for controlling the fluctuation of the switching time is provided in the timer circuit, so that a comfortable temperature stimulus is given to the user, and the full-energization and the half-energization are alternately switched in a certain time. It is possible to give a sense of warmth with a lower energization rate than in the case, and it is possible to save electricity costs.

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

  Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 is a partial sectional front view of an electric heater according to a first embodiment of the present invention, FIG. 2 is a circuit configuration diagram of the electric heater, and FIG. 3 is a control block diagram showing another embodiment of the electric heater. It is.

  In FIG. 1, 21 is a stove body having an open front surface, 22 is a reflector provided in the stove body, 25 is a carbon resistance heating element 24 provided in front of the reflection plate 22, and the carbon resistance heating element. This is a heating element unit including a tube body 23 covering the outer periphery of 24. 26 is an operation changeover switch for switching the operation of the device. The heating element unit 25 is turned off 26A, strong 26B (full energization), medium 26C (full energization and 1/2 energization are alternately switched every predetermined time), and weak 26D. (1/2 energization) is switched, and when the operation changeover switch 26 is set to the medium 26C, the energization control means 27 passes through the full energization directly energizing the heating element unit 25 and the half-wave rectifier 28. The energization rate control is performed by switching the 1/2 energization performed at regular intervals.

  The operation and action of the electric heater configured as described above will be described below.

  First, when the operation changeover switch 26 is set to the weak 26D position, the half-wave rectifier 28 is energized, half-wave rectified by the half-wave rectifier 28, and energized to the heating element unit 25 every half cycle of the AC frequency. become. Next, when the operation changeover switch 26 is set to the position of strong 26B, the heating element unit 25 is energized directly from the AC power supply to enter the strong operation mode. Next, when the operation changeover switch 26 is set to the middle 26C position, the heating element unit 25 is energized alternately by the energization control means 27 via the half-wave rectifier 28, so that the heating element unit 25 is energized. Is a mid-running mode that repeats alternately during weak driving and strong driving.

  As described above, in the present embodiment, the heating element unit 25 is energized with an intermediate capacity between 1/2 energization and full energization by changing the energization rate of 1/2 energization and full energization by the energization control means 27. In addition to the two-level strength switching between 1/2 energization and full energization, heating capacity switching between them can be added, and the capacity switching of electric stoves can be made multi-stage at low cost with a simple configuration. it can. In addition, since the heating element unit 25 is operated at least weakly, the heating element unit 25 is always red-hot, and it is easy to grasp that the electric heater is in operation, thereby improving safety and always obtaining radiant heat and a feeling of heating. To improve.

As shown in FIG. 3, when the fluctuation control unit 29 for controlling the switching time is provided in the energization control unit 27, a comfortable temperature stimulus is given to the user. It is possible to give a sense of warmth with a lower energization rate than when switching to 2-energization, and it is possible to save electricity costs.

(Embodiment 2)
FIG. 4 is a circuit configuration diagram of an electric heater according to the second embodiment of the present invention, and FIGS. 5 and 6 are timing charts of energization through the half-wave rectifier 28 and switching time for directly energizing the heating element unit 25. It is. The same parts as those in the first embodiment are given the same numbers, and only different parts will be described.

  In FIG. 4, the operation changeover switch 30 for switching the operation of the device includes a cut-off 30A, a strong 30B (full energization), and a medium I30C (half energization shorter than the full energization every predetermined time). Switching between the middle II30D (switching alternately every predetermined time so as to make 1/2 energization longer than full energization), and weak 30E (1/2 energization). When the operation changeover switch 30 is set to the middle I30C and middle II30D settings, the energization control means 31 uses the timer means 32 to alternately switch between full energization and 1/2 energization at regular intervals. The energization rate control is performed by switching the obtained intermediate energization at a predetermined switching rate.

  The operation and action of the electric heater configured as described above will be described below.

  First, when the operation changeover switch 30 is set to the middle I30C position, the energization of the heating element unit 25 is alternately switched every predetermined time so that 1/2 energization is shorter than the entire energization. The I operation mode is repeated while alternately repeating the radiation during the weak operation and the radiation during the strong operation, and the half-wave rectifier 28 and the heating element unit 25 are alternately energized as shown in the timing chart of FIG. . That is, as shown in the timing chart of FIG. 5, the time of 1/2 energization through the half-wave rectifier 28 is shorter than the time of direct energization to the heating element unit 25, so that it is more irradiated than in the strong operation mode. The amount of heat generated is small, and the amount of heat radiated is greater than in the weak operation mode.

  Similarly, in the middle II operation mode, as the timing chart of FIG. 6 shows, energization of the heating element unit 25 takes a longer time for half energization through the half-wave rectifier 28, so that it is longer than in the middle I operation mode. The amount of radiant heat is small and larger than during weak driving.

  As described above, in the present embodiment, intermediate energization obtained by alternately switching full energization and 1/2 energization at regular intervals by the operation changeover switch 30 is performed by the timer means 32 of the energization control means 31 with a predetermined changeover. The heating element unit can be energized at a plurality of switching rates between full energization and 1/2 energization by setting a plurality of switching rates. With the configuration, the electric stove can be switched in multiple stages with three or more stages at low cost, fine temperature adjustment and energy saving can be achieved, and usability is improved.

(Embodiment 3)
FIG. 7 shows a circuit configuration of the electric heater in the third embodiment of the present invention. The same parts as those in the first embodiment are given the same numbers, and only different parts will be described.

  In FIG. 7, reference numeral 33 denotes switching time setting means for changing the switching time so that the user can set the time for alternately switching between full energization and half energization. The switching time set by the switching time setting means 33. In response to this, the energization control means 34 switches the energization to the half-wave rectifier 28 and the heating element unit 25.

Since the switching time setting means 33 for changing the switching time is provided so that the user can set the time for alternately switching between full energization and half energization, the user can change the switching time according to the usage situation. , It becomes possible to set the time to alternately switch between full energization and 1/2 energization, and the amount of radiant heat can be arbitrarily set between the weak operation mode and the strong operation mode, and the optimum operation switching for the user should be performed This makes it possible to adjust the temperature appropriately and save energy.

  As described above, the electric stove according to the present invention controls the energization rate so as to alternately perform 1/2 energization and full energization at regular intervals, thereby switching between 1/2 energization and full energization. In addition, it is possible to energize the heating element unit at an intermediate energization ratio between 1/2 energization and full energization, and the electric heater can be switched between strong and weak. It can also be applied to applications such as multistage operation switching of warming tools.

The partial cross section front view of the electric heater in Embodiment 1 of the present invention Circuit diagram of the electric stove Control block diagram showing another embodiment of the electric stove Circuit configuration diagram of electric stove in Embodiment 2 of the present invention Timing chart of the timer circuit Timing chart of the timer circuit Circuit diagram of electric stove in Embodiment 3 of the present invention Partial sectional perspective view of a conventional electric stove Front view of another conventional electric heater

Explanation of symbols

21 Stove body 22 Reflecting plate 23 Tube 24 Carbon resistance heating element 25 Heating element unit 26 Operation changeover switch (changeover switch)
27 Energization control means 28 Half-wave rectifier 29 Fluctuation means 30 Operation switching switch of Embodiment 2 31 Energization control means of Embodiment 2 32 Timer means 33 Switching time setting means 34 Energization control means of Embodiment 3

Claims (4)

A stove body having an open front surface, a reflector provided in the stove body, a heating element unit including a carbon resistance heating element provided in front of the reflection plate and a tube covering the outer periphery thereof, and the carbon resistance heating An electric stove comprising a circuit unit for controlling an energization rate to the body unit, and an energization control means for alternately energizing the energization rate by half and full energization every predetermined time. The selector switch is provided with a plurality of settings for switching intermediate energization obtained by alternately switching between full energization and 1/2 energization at regular intervals at a predetermined switching rate, and is set in the energization control means by the changeover switch. The electric stove according to claim 1, further comprising timer means for controlling in accordance with the switching rate. The electric stove according to claim 1 or 2, wherein a switching time setting means for setting a switching time is provided in the circuit unit so that a user can set a time for alternately switching between full energization and half energization. The electric stove according to claim 1, wherein fluctuation means for fluctuation control of switching time is disposed in the energization control means.