JP2003121002A - Infrared stove with fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate sufficient electric power for driving an air blowing fan from series type thermocouple installed in a limited space. SOLUTION: The series type thermocouple 13 is formed of front and rear thermocouple trains 18 and 17, so that much more thermocouple elements can be provided in the limited space in front of a combustion plate 7. The small-type front thermocouple train 18 is formed in a general L-shape inside the large-type rear thermocouple train 17 that is formed in a general L-shape, so that the hot contacts (a) of the rear thermocouple train 17 and the front thermocouple train 18 are easily arranged to have the same distance from a burning face 5. Thus, the hot contacts (a) of both the thermocouple trains 17 and 18 can be placed in a highest temperature portion, thereby obtaining thermal electromotive force efficiently.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared stove with a fan for heating by hot air in addition to radiant heat from an incandescent plate burner. [0002] Conventionally, a stove of a type in which a ventilation fan is provided in an infrared stove provided with a gas burner of a red hot plate type and heats by hot air in addition to radiant heat from the red hot plate is known. . As this type of infrared stove, for example, in Japanese Utility Model Publication No. 27008/1990, as shown in FIG. 13, the heat of combustion of the gas burner 104 is converted into electric power by a
A configuration in which the power is supplied to the power supply terminal 09 is proposed. In the infrared stove 101, a plurality of thermocouple elements 123 are provided facing the red heat plate 107 and connected in series to form a series thermocouple 113, which is connected to the motor of the blower fan 109. FIG. 1 shows an example of such a series thermocouple.
As shown in FIGS. 4 and 15, two different types of metal members 21 are used.
It is known that a plurality of thermocouple elements 223 are continuously formed by connecting the end portions of the thermocouple elements 9 and 220 in a zigzag shape. That is, each thermocouple element 223
By forming the hot junction a ′ and the cold junction b ′ as many as the number, the thermoelectromotive force obtained from each thermocouple element 223 is small, but a large thermoelectromotive force is obtained as a whole. . Then, in the infrared stove 101 described above, such a series thermocouple 213 is connected to the glowing plate 10.
In order to incorporate and install a sufficient number of thermocouple elements 123 to supply necessary power to the blower fan 109 within the width of 7, the distance H ′ between the metal members 219 and 220 had to be reduced. . [0004] However, if the distance H 'between the metal members 219 and 220 is too small, it becomes difficult to dissipate heat, and the cold junction b' rises to a considerable temperature, and the cold junction b ' There is a problem in that the temperature difference between 'and the hot junction a' becomes small and the generated thermoelectromotive force is reduced. The infrared stove with a fan of the present invention solves the above-mentioned problem, and aims to generate sufficient electric power to drive a blowing fan from a series-type thermocouple installed in a limited space. [0005] To solve the above-mentioned problems, an infrared stove with a fan according to the present invention comprises a series thermocouple in which a plurality of thermocouple elements are connected in series and a red-hot plate burner. In the infrared stove with a fan, which faces the combustion surface of the stove and drives the blower fan by the thermoelectromotive force obtained from the series-type thermocouple, in addition to the radiant heat from the red hot plate type burner, the heater also heats with hot air. The series-type thermocouple has a plurality of two-type metal plates formed in a substantially L-shape, and a plurality of two-type metal plates are alternately arranged, and the end portions thereof are connected and connected in a zigzag manner to form a plurality of thermocouple arrays. The gist is that each of the hot junctions is provided at an equal distance from the combustion surface. In the infrared stove with a fan according to the first aspect of the present invention having the above-described structure, since the series-type thermocouples are formed by a plurality of thermocouple rows, more thermocouple elements can be provided in the same space. Can be provided. In addition, since the metal members forming the series-type thermocouple are formed in a substantially L shape, all the hot junctions of the thermocouple array arranged in a plurality of rows can be arranged at the same distance from the combustion surface. For this reason, it becomes possible to arrange all the hot junctions at the highest temperature position. DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the structure and operation of the present invention described above, a preferred embodiment of an infrared stove with a fan of the present invention will be described below with reference to FIGS. I do. FIG. 1 is a schematic sectional view of an infrared stove 1 with a fan (hereinafter, simply referred to as a stove 1) according to an embodiment of the present invention, FIG. 2 is a front view, and FIG. FIG. 2 is a front view of a burner 4 provided in 1.
FIG. 1 is a cross-sectional view taken along a dashed line AA in FIG.
The stove 1 includes a glowing plate-type burner 4 in a main body case 3 having a radiation opening 2 provided on the front surface thereof, facing the radiation opening 2. Therefore, the burner 4 is provided with the combustion surface 5 facing substantially in front. The burner 4 includes an all-primary pneumatic system including a burner main body 6 forming a mixing chamber of fuel gas and primary air, and a ceramic combustion plate 7 provided with a large number of flame holes mounted on the burner main body 6. A fuel gas and primary air sucked from a suction hole (not shown) are satisfactorily mixed in the burner main body 6, and the air-fuel mixture blows out from a flame hole of the combustion plate 7, and burns on the combustion plate 7. Burn. The burner main body 6 is divided into an upper burner main body 29 and a lower burner main body 30 in two upper and lower stages. Further, two combustion plates 7 are provided on each of the upper burner main body 29 and the lower burner main body 30, and only the two surfaces provided on the lower burner main body 30 are set to a high heat power setting for injecting fuel gas from the entire surface. It is possible to switch between two types of heat power setting of a low heat power setting for injecting fuel gas from the fuel cell. A blower fan 9 is provided at the bottom of the main body case 3 for blowing out the combustion gas from the burner 4 from a hot air outlet 8 provided at a lower portion of the front surface of the main body case 3. Behind the burner 4, a hot air suction port 10 is provided near the upper side of the burner 4, and a combustion gas passage 11 that guides a combustion gas to the blower fan 9.
Is provided. The combustion gas passage 11 is provided with a horizontal duct 11 for guiding the combustion gas laterally from near the center of the appliance body to the rear side.
a and a vertical duct 11b for vertically guiding the combustion gas from the upper part to the lower part of the appliance. The blower fan 9 and the hot air outlet 8 are communicated with each other by a hot air passage 12. Further, a cool air suction port 31 is opened at a position substantially opposite to the warm air suction port 10 above the rear surface of the appliance.
The cold air intake 41 is opened in the vertical duct 11b at a position opposite to the above. Accordingly, when the blower fan 9 is driven, the combustion gas is sucked from the hot air suction port 10, the external air is sucked from the cold air suction port 31, and mixed in the combustion gas passage 11 and the hot air passage 12. Then, a mixture of combustion gas and external air adjusted to a high temperature that does not cause burns is blown out and sent out from the hot air outlet 8 as hot air. On the front surface of the combustion surface 5 of the burner 4, serial thermocouples 13 (described later) arranged in front and rear two rows are provided to face each other, and the thermoelectromotive force generated by the serial thermocouples 13 blows air. Used as a power supply for the motor of the fan 9. Radiation aperture 2
And the hot air outlet 8 are provided with a plurality of guard rods 14,
The hand and the like of the user are prevented from entering the instrument body. In addition, the ignition lever 1
5, a heating power switching lever 16 for switching the heating power of the burner 4 is provided on the left side. Next, the series thermocouple 13 will be described.
As shown in FIGS. 1 and 4, the series-type thermocouple 13 includes a rear thermocouple row 17 and a front thermocouple row 18 arranged in two rows before and after the combustion surface 5. As shown in FIGS. 5 to 7, the rear thermocouple train 17 includes a first metal member 19 made of a stainless steel plate having a substantially L-shaped outer shape and a constant L plate having a substantially L-shaped outer shape thinner than the first metal member 19. And a second metal member 20 made of The first metal member 19 is made of copper.
It may be made of chromel or iron. The lower end of the second metal member 20 is bent so that a step H is formed, and the bent lower end 2 is formed.
1 is formed, and the front end is bent in the opposite direction to the lower end so as to form a step H, thereby forming a bent front end 22. The front end and the lower end of the first metal member 19 are not bent and form a flat front end 33 and a flat lower end 32, respectively. Further, the flat tip portion 33 is formed with a notch portion 33a which becomes thin. Then, as shown in FIG. 7, the flat tip 33 and the bent tip 22 face each other, and the flat lower end 32 and the bent lower end 21 of the first metal member 19 and the second metal member 20 face each other. By alternately arranging them so as to face each other and alternately welding the front end and the lower end thereof and connecting them in a zigzag shape, the plurality of thermocouple elements 23 are connected in series to form the rear thermocouple row 17. The junction between the bent front end 22 and the flat front end 33 becomes a hot junction a, and the junction between the bent lower end 21 and the flat lower end 32 becomes a cold junction b. Since the notch 33a is formed in the flat tip 33, the heat capacity of the hot junction a is reduced. The front end and the lower end of the second metal member 20 are
Since each is bent and provided with a step H,
When connected as described above, a gap having a distance H is formed between the metal members 19 and 20, and insulation between the metal members 19 and 20 other than the hot junction a and the cold junction b is ensured. Also, the metal member 1
As shown in FIGS. 8 and 9, in order to ensure insulation between the metal members 9 and 20, a strip-shaped insulator 24 is provided between the metal members 19 and 20.
May be pinched meandering. The width M of the band-shaped insulator 24 is formed sufficiently narrower than the length L of the metal members 19 and 20. FIG. 9 is a cross-sectional view taken along dashed line BB in FIG. The material cost of the constantan, which is the material of the second metal member 20 in the present embodiment, is
About 10 times the material cost of stainless steel. Therefore, when the first metal member 19 and the second metal member 20 are formed in the same cross-sectional area, that is, the same plate thickness, for example, 1.0 mm in thickness as usual, the electric power per one first metal member 19 is obtained. Assuming that the resistance value is 6.4 mΩ and the material cost is A yen, the electric resistance value per one second metal member 20 is 4.4.
mΩ, the material cost is 10 A yen, so the electric resistance per thermocouple element 23 is 10.8 mΩ, and the material cost is 11 A
It is a circle. On the other hand, in the present embodiment, the first metal member 19 and the second metal member 20 have different cross-sectional areas, that is, plate thicknesses, and the first metal member 19 (plate thickness) made of stainless steel, which is an inexpensive material. X) is formed to be thicker than the second metal member 20 (plate thickness Y) made of Constantan, which is an expensive material. For example, in the present embodiment, the first metal member 1
9, the plate thickness X is 1.5 mm, and the plate pressure Y of the second metal member 20 is 0.8 mm. The electric resistance value per one first metal member 19 when formed in this manner is 4.3 mΩ,
Since the material cost is 1.5 A yen, the electric resistance value per one second metal member 20 is 5.5 mΩ, and the material cost is 8 A yen, the electric resistance value per thermocouple element 23 is 9.8 m.
Ω, material cost is 9.5A yen. That is, by forming the series-type thermocouple 13 as in the present embodiment, the material cost can be reduced and the electric resistance value can be reduced. Similarly to the rear thermopile 17, the front thermopile 18 has a first metal member 19 'made of a stainless steel plate having a substantially L-shaped outer shape shown in FIGS. 10 and 11, and is thinner than the first metal member 19'. And a second metal member 20 'formed of a constantan plate having a substantially L-shaped outer shape. These metal members 19 ', 2
0 ′ is formed smaller than the metal members 19 and 20 of the rear thermopile 17. The front end and the lower end of the second metal member 20 ′ of the front thermopile 18 are bent in the opposite directions to the front end and the lower end of the second metal member 20 of the rear thermopile 17, and the step H Occurs, and the bent front end portion 22 'and the bent lower end portion 2
1 ′ are formed. The protruding distance of the distal ends of the metal members 19 ′ and 20 ′ forming the front thermopile 18 is shorter than the protruding distance of the distal ends of the metal members 19 and 20 forming the rear thermopile 17. . And, like the rear thermopile 17, the first metal member 19 'and the second metal member 20'
The flat tip portion 33 'and the bent tip portion 22' face each other, the flat lower end portion 32 'and the bent lower end portion 21' are alternately arranged so as to face each other, and the tip portion and the lower end portion are alternately welded. By connecting in a zigzag manner, a plurality of thermocouple elements are connected in series with a polarity opposite to that of the rear thermocouple row 17 to form a front thermocouple row 18. Further, the junction between the bent front end 22 ′ and the flat front end 33 ′ becomes the hot junction a, and the bent lower end 2
The junction between 1 'and the flat lower end 32' becomes the cold junction b. As shown in FIG. 4, the front thermopile train 18 and the rear thermopile train 17 are sandwiched between a front plate 34 and a rear plate 35,
It is stopped at 6 and positioned. An insulating plate 37 is interposed between the rear thermopile row 17 and the front thermopile row 18, and the rear thermopile row 1
By enclosing 7 in the rear insulating case 38 and enclosing the front thermopile 18 in the front insulating case 39, insulation between the rear thermopile 17 and the front thermopile 18 is ensured. Further, the rear thermopile 17 and the front thermopile 18 are connected in series by a lead wire 40. As shown in FIGS. 1 and 3, the burner 4 is provided with a frame 25 so as to cover the periphery of the combustion surface 5, and a cooling hole 26 is provided in a part below the frame 25. It is opened. The serial thermocouple 13 is attached with the cold junction b facing the cooling hole 26. That is, there is a gap through which air passes between the edge of the cooling hole 26 and the series-type thermocouple 13. The upper part of the frame 25 has a through hole 2
7 is opened. According to the stove 1 having the above-described structure, when the ignition lever 15 is operated, fuel gas is ejected from the entire surface of the four combustion plates 7 and ignited by discharge from electrodes (not shown). Then, the user in front of the appliance is directly heated by the radiant heat from the red hot combustion plate 7. Further, when the heating power switching lever 16 is operated, the high heating power setting at which the fuel gas is ejected from the entire four combustion plates 7 and the lower burner main body 3 are set.
By switching between the setting of the low heating power spouting from only the two surfaces provided at 0, the heating power of the burner 4 can be adjusted according to the user's preference. When the burner 4 burns, the combustion heat of the burner 4 heats the hot junction a of the series thermocouple 13 to generate a thermoelectromotive force, and the blower fan 9 is driven. Then, the blower fan 9 sucks the combustion gas of the burner 4 from the warm air inlet 10 and the external air from the cool air inlet 31, and blows out and emits the mixture from the warm air outlet 8 toward the front of the appliance.
Heat the entire room uniformly with warm air. The series thermocouple 13 is connected to the rear thermocouple train 1
7 and the front thermocouple row 18, so that more thermocouple elements 23 can be provided in a limited space such as the front surface of the combustion plate 7. Therefore, the distance H between the metal members 19 and 20 can be increased while securing the number of thermocouple elements 23 necessary for driving the blower fan 9, so that heat radiation is promoted and the temperature of the cold junction b rises. Can be suppressed, and a thermoelectromotive force can be obtained efficiently. Further, the series-type thermocouple 13 is provided with a small front thermocouple row 18 formed substantially in an L shape inside a large rear thermocouple row 17 formed in a substantially L-shape. The hot junction a of the twin row 17 and the hot junction a of the front thermopile row 18 are easily connected to the combustion surface 5.
It can be installed so as to be equidistant from. Since the temperature of the flame burning on the surface of the combustion plate 7 is determined by the horizontal distance from the combustion plate 7, the hot junction a of the rear thermopile train 17 and the front thermopile train 18 can be easily set to the highest temperature. It can be installed and a thermoelectromotive force can be obtained efficiently. In addition, even if the heating power is adjusted by switching the combustion plate 7 from which the fuel gas is ejected, the hot junction a of the series-type thermocouple 13 is always located at a position heated by the combustion gas. Power can be supplied stably. In addition, since the notch 33a is formed in the flat tip portion 33 to reduce the heat capacity of the hot junction a, the temperature of the hot junction a quickly rises, and the hot The output of the thermocouple 13 improves. The thickness X, ie, the cross-sectional area of the first metal member 19 made of inexpensive material, stainless steel, is increased, and the thickness Y, ie, the cross-sectional area of the second metal member 20, made of expensive material, constantan is increased. By reducing the size, the material cost of the series-type thermocouple 13 can be reduced, and the electric resistance value can be reduced. Accordingly, it is possible to manufacture the high-output series thermocouple 13 at low cost. In other words, in a series-type thermocouple formed by alternately arranging two types of metal plates having different metal types and having substantially the same shape, the thickness of an inexpensive metal plate is increased, and the thickness of an expensive metal plate is reduced. By doing so, a high-output series thermocouple can be obtained at low cost. In particular, the cost merit is great in a combination with a large price difference such as constantan and stainless steel. Further, since the air around the burner 4 flows upward from below due to the draft force generated by the combustion of the burner 4, the frame 25 is provided so as to cover the periphery of the combustion surface 5 of the burner 4. The air around the burner 4 is intensively sucked through the cooling holes 26 opened in the frame 25. And, the cold junction b of this series thermocouple 13
Are arranged facing the cooling holes 26, the cold junction b can be intensively cooled by the flow of air, and a thermoelectromotive force can be obtained efficiently. The air sucked from the cooling hole 26 by the draft force is heated by the burner 4 and smoothly flows upward through the passage hole 27 and the front surface of the burner 4. Since the burner 4 is an all-primary air burner, the combustion performance does not deteriorate even if the periphery of the combustion surface 5 is covered with the frame 25 in this way, but a burner that requires secondary air, such as a Bunsen burner. If
If the frame 25 surrounds the periphery, a position where secondary air is hardly taken in is generated, and the combustion performance deteriorates. Further, by forming a gap having a distance H between the metal members 19 and 20, insulation between the metal members 19 and 20 other than the hot junction a and the cold junction b can be ensured. further,
If the strip-shaped insulator 24 is meanderingly sandwiched between the metal members 19 and 20, this insulation can be reliably performed. Moreover, since the band-shaped insulator 24 can be fixed between the metal members 19 and 20 only by meandering and sandwiching it, it is necessary to provide a fixing member for fixing the insulator 24 between the metal members 19 and 20. And cost increase can be suppressed. Further, the width M of the band-shaped insulator 24 is set to the metal members 19 and 2.
Even if it is sufficiently narrower than the length L, it can be easily fixed between the metal members 19 and 20 by meandering and sandwiching, so that the gap between the metal members 19 and 20 can be sufficiently maintained.
The temperature rise of the cold junction b can be suppressed. Further, since the cool air suction port 31 for sucking the air outside the apparatus is provided above the rear surface of the apparatus, dust on the floor is not sucked from the cool air suction port 31 and is opened directly upward. Because it does not mean that dust floating in the air does not fall into the device. Therefore, fan clogging due to dust can be prevented.
In particular, when the blower fan 9 is driven by such thermal power generation, a large amount of power cannot be obtained as compared with a general power source, and dust clogging has a large effect. It is very useful to prevent dust from entering. Here, the upper side of the back surface of the device means a position higher than an intermediate position in the height direction of the device. Furthermore,
By providing the hot air suction port 10 near the upper side of the burner 4, the combustion gas of the burner 4 flowing upward by the draft force can be efficiently sucked, and the combustion gas passage 11 can be made as short as possible. Blower fan 9
However, an effective heating effect can be obtained even if the driving force is weak. In addition, by providing the hot air outlet 8 below the front of the appliance, warm air can be blown downward in the room, and a more efficient heating effect can be obtained. In addition, cold air inlet 3
By not opening the device 1 directly upward, falling objects such as dust such as paper waste can be prevented from dropping into the apparatus, and can be used safely. Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments at all, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention. is there. For example, in the present embodiment, the frame 25 is provided so as to cover the entire periphery of the combustion surface 5 of the burner 4, but as shown in FIG. 28 may be provided. In this case, the air and the combustion gas sucked by the draft force do not accumulate in the frame 28, and the flow of the air and the combustion gas can be further smoothed.
Therefore, there is no inconvenience that air suction from the cooling holes 26 is obstructed, and the cold junction b can be cooled well. Of the bent front end portion 22 and the flat front end portion 33 forming the hot junction a, the notch portion 33a is formed only in the flat front end portion 33 to make it thinner. A notch may be formed. Further, a plurality of band-shaped insulators 24 may be interposed between the metal members 19 and 20. Further, the series-type thermocouple 13 is formed by two inner and outer rows of the front thermocouple row 18 and the rear thermocouple row 19, but the present invention is not limited to this, and a plurality of thermocouple rows having different sizes of metal members are used. It is sufficient that the thermocouples are arranged sequentially from the inside to the outside from the small thermopile to the large thermopile. That is, the series-type thermocouple is not limited to a thermocouple formed by arranging thermocouples in two rows, but may be formed by forming thermocouples in multiple rows. As described in detail above, claim 1 of the present invention
According to the infrared stove with a fan described above, the distance between the metal members constituting the series-type thermocouple can be increased while securing the necessary number of thermocouple elements in a limited space. Therefore, there is no problem that heat is hardly dissipated and the temperature of the cold junction rises and it becomes impossible to obtain a high thermoelectromotive force, and the thermoelectromotive force can be obtained efficiently. In addition, since all the hot junctions of the series-type thermocouple can be installed at the position where the temperature is the highest, the thermoelectromotive force can be obtained more efficiently.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view of an infrared stove with a fan as an embodiment. FIG. 2 is a front view of the infrared stove with a fan according to the embodiment. FIG. 3 is a front view of the burner of the embodiment. FIG. 4 is a perspective view of the series thermocouple of the present embodiment. FIG. 5 is a three-view drawing of a first metal member constituting a rear thermopile of the present embodiment. FIG. 6 is a three-view drawing of a second metal member constituting a rear thermopile of the present embodiment. FIG. 7 is a front view of a rear thermopile according to the embodiment. FIG. 8 is a front view of a case where a band-shaped insulator is sandwiched in the rear thermocouple row of the embodiment. FIG. 9 is a cross-sectional view when a band-shaped insulator is sandwiched in the rear thermopile of the present embodiment. FIG. 10 is a three-view drawing of a first metal member constituting the front thermopile of the present embodiment. FIG. 11 is a three-view drawing of a second metal member constituting the front thermopile of the present embodiment. FIG. 12 is a front view of a burner according to another embodiment. FIG. 13 is a schematic sectional view of an infrared stove with a fan as a conventional example. FIG. 14 is a front view of a series thermocouple as a conventional example. FIG. 15 is a front view of a metal member as a conventional example. [Description of Signs] 1 stove, 4 burner, 5 combustion surface, 7 combustion plate, 9 blower fan, 13 series thermocouple, 17 rear thermocouple train, 18 front thermocouple train, 19 ... First metal member, 2
0: second metal member, 21: bent lower end, 22: bent tip, 23: thermocouple element, 32: flat tip, 33: flat lower end, a: hot junction, b: cold junction.

Claims (1)

Claims: 1. A series thermocouple, in which a plurality of thermocouple elements are connected in series, is opposed to a combustion surface of an incandescent plate burner, and a thermoelectromotive force obtained from the series thermocouple is used. In the infrared stove with a fan, which drives the blower fan and also heats with hot air in addition to the radiant heat from the glowing plate type burner, the series-type thermocouple includes two types of metal formed in a substantially L shape. A plurality of plates are alternately arranged, and a plurality of thermocouple arrays formed by connecting ends thereof in a zigzag manner are arranged in a plurality of arrays, and each hot junction is provided so as to be equidistant from the combustion surface. An infrared stove with a fan.