Electric type burner

Abstract

To provide an electric type burner that can be used for a long period of time and has a stable temperature of hot air.SOLUTION: An electric type burner introduces gas through an inlet, heats the gas, and discharges it from an outlet. The electric type burner includes an exterior body provided with the inlet and the outlet, an insulator provided within the exterior body and having a plurality of through holes penetrating from the inlet side to the outlet side, and a plurality of electric heating rods inserted into the through holes and heated by passing electricity through them, and the gas introduced through the inlet is heated as it passes through gaps between the through holes and the electric heating rods and is then discharged from the outlet.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an electric burner that blows out high-temperature hot air. [Background technology]

[0002] Burners have traditionally been used as heating devices for a variety of purposes, including cooking, welding, heating for experiments, and space heating. Generally, there are gas burners that generate heat by burning flammable gases, and fuel burners that generate heat by burning fuels such as oil.

[0003] On the other hand, there are electric burners that generate heat electrically without using flammable gas or fuel. Electric burners have the advantage of being easier to control the temperature than burners that use fuels such as gas or oil. In other words, electric burners can easily control the temperature by adjusting the power supply, and can heat stably within the required temperature range, allowing for more precise temperature control than burners that use fuel.

[0004] Electric burners also produce almost no nitrogen oxides (NOx), carbon monoxide (CO), carbon dioxide (CO2), water vapor, or char soot, which are generated by fuel-burning burners. This reduces the burden on the environment and eliminates the need for exhaust gas purification or treatment. This characteristic also improves indoor air quality, making the work environment safer and more comfortable.

[0005] This type of electric burner is described as a conventional hot air generating heater in Patent Document 1, for example, and has the following configuration: A cylindrical insulator is disposed inside the hot air generating heater. This insulator has multiple through-holes, and a spirally wound electric heating wire such as nichrome wire is disposed in each through-hole.

[0006] The gas drawn into the heater flows in the axial direction of the insulator, passing through the through-holes in which the heating wire is placed, and is heated. An appropriate number of insulators are arranged in the axial direction and placed inside the heater. The heater body has a gas inlet and a hot air outlet, and the insulators are placed and fixed inside the heater body.

[0007] The number of insulators arranged is determined according to the capacity of the heater for generating hot air, and the through-holes of each insulator are positioned in the same position. The heating wire is placed inside the through-hole, running from the inlet toward the outlet. The insulators are fixed with long bolts and nuts, and a temperature sensor to prevent abnormal overheating is also placed in the insulator's through-hole. In addition, the discharge temperature sensor is placed in front of the insulator closest to the outlet inside the heater body. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-213637 Summary of the Invention [Problem to be solved by the invention]

[0009] However, conventional electric burners use a spirally wound heating wire, which poses challenges in generating ultra-high temperature hot air in a short period of time and in the lifespan of the heating wire, which is the heating element.

[0010] In other words, when a spirally wound heating wire is inserted into a through-hole in an insulator and air is sent through the through-hole, as the air passes through the spiral heating wire, the shape of the heating wire obstructs the air, reducing its wind speed compared to when the air moves in a straight line.In addition, it is difficult to make uniform contact with the heating wire, resulting in a decrease in the heat exchange rate.

[0011] Furthermore, when a heating wire is wound in a spiral shape, it is unavoidable that the wire will be thin due to mechanical processing issues, and the mechanical strength of the heating wire will naturally be lower than when it is thicker. Also, in electric heaters, the heating wire is easily deteriorated due to use at high temperatures and repeated heating and cooling cycles. In particular, when the heating wire is wound in a spiral shape, the air does not come into uniform contact with the heating wire, causing temperature unevenness in the heating wire, and this temperature unevenness accelerates the deterioration of the heating wire.

[0012] Furthermore, with conventional electric burners, the more hot air that is produced, the more likely it is that the heater generated by the heating wire is released to the outside through the exterior body rather than as hot air, reducing the energy efficiency of the electric burner.

[0013] In other words, although electric burners have heating wires (heat generating elements) covered by insulators with extremely low thermal conductivity, some of the heat generated in the heating wires is transferred to the insulators and then released from the exterior body that holds the insulators in contact, causing heat leakage. This heat leakage increases as the temperature of the heat generated by the heating wires increases, and therefore becomes a heat quantity that cannot be ignored in electric burners that emit extremely hot air.

[0014] The present invention has been proposed to solve the above problems, and aims to provide an electric burner that can be used for a long period of time and has a stable hot air temperature. The present invention also prevents heat leakage from the electric burner and improves the energy efficiency of the electric burner. [Means for solving the problem]

[0015] (1) To solve the above problems, the electric burner of the present invention introduces gas through an inlet, heats the gas, and discharges it from an outlet. The electric burner includes an exterior body provided with the inlet and the outlet, an insulator provided within the exterior body and having a plurality of through holes penetrating from the inlet side to the outlet side, and a plurality of electric heating rods inserted into the through holes and heated by passing electricity through them, and the gas introduced through the inlet is heated as it passes through gaps between the through holes and the electric heating rods and is then discharged from the outlet.

[0016] In this electric burner, compared to when a spiral heating wire is used as the heating element, the use of an electric heating rod allows air to flow linearly through the gap between the through-hole and the electric heating rod, resulting in more uniform heating, improving the heat exchange rate and enabling more efficient heat exchange.

[0017] Furthermore, compared to when a spiral heating wire is used as the heating element, the use of an electric heating rod as the heating element reduces temperature unevenness and improves mechanical strength, resulting in a highly durable electric burner.

[0018] (2) In the electric burner described above, the pair of electric heating rods may be made of U-shaped electric heating rod members, and a pair of straight portions of the electric heating rod members may be inserted into the pair of through holes.

[0019] With this electric burner, the pair of straight portions of the electric heating rod member are passed through the pair of through-holes, making the insertion process easy. Also, since the electric heating rod members form a pair of electric heating rods electrically connected in series, a series of electric circuits can be easily formed.

[0020] (3) In the electric burner described above, the through holes of the insulator may have the same shape and cross-section dimensions, and the plurality of electric heating rods may have the same shape and cross-section dimensions.

[0021] In this electric burner, the electric heating rod and the through-hole have the same shape and cross-section dimensions, and the gap formed by the electric heating rod and the through-hole extends in the same shape. This allows the air passing through the gap to move in a straight line, so that it is heated uniformly by the electric heating rod, and the thermal efficiency of the electric burner can be improved.

[0022] (4) The electric burner may include a hollow cylindrical portion that holds the insulator inside the outer casing, and a flow path on the outer periphery of the cylindrical portion through which air introduced from the inlet is sent, and the flow path may form an air insulation structure between the cylindrical member and the outer casing.

[0023] In this electric burner, the hollow cylindrical portion located inside the exterior body and the flow path connected to it insulate the insulator that receives heat from the electric heating rod from the outside, thereby reducing heat leakage and improving the energy efficiency of the electric burner. Furthermore, since the gas flowing through the flow path is the gas that will later be heated by the electric heating rod, it is preheated by the heat from the insulator before being heated by the electric heating rod. This allows the preheated gas to be further heated by the electric heating rod, improving the energy efficiency of the electric burner.

[0024] (5) In the electric burner, the flow path may have a double heat insulating structure. This electric burner further reduces heat leakage and enhances the gas preheating effect, thereby further improving the energy efficiency of the electric burner.

[0025] (6) The electric burner may include a first sensor protruding from the outlet side of the insulator, a second sensor provided in the center between the inlet and outlet of the insulator, and a third sensor provided on the inlet side of the insulator.

[0026] This electric burner uses a first sensor to detect the air temperature near the outlet, a second sensor to detect the temperature of the insulator, and a third sensor to detect the temperature near the inlet, allowing control according to the temperature state of each sensor.

[0027] (7) In the electric burner described above, after the electric heating rod is energized, a second sensor provided at the center of the inlet and outlet of the insulator may be operated to introduce gas from the inlet after the predetermined temperature is reached.

[0028] With this electric burner, electricity is passed through the electric heating rod, and gas is introduced once the insulator has reached a predetermined temperature, so the gas is heated rapidly and can be released at the desired temperature in a short period of time. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a perspective view of an electric burner according to an embodiment of the present invention; [Figure 2] 1 is a side cross-sectional view of an electric burner according to an embodiment of the present invention. [Figure 3] FIG. 3 is a side cross-sectional view of the exterior body shown in FIG. [Figure 4] FIG. 3 is a side cross-sectional view of the electric heater unit shown in FIG. 2. [Figure 5] FIG. 5 is a front view of the insulator shown in FIG. [Figure 6] FIG. 3 is a rear view of the electric heater unit shown in FIG. 2. [Figure 7] FIG. 2 is a plan view of the electric heating rod member according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0030] An electric burner according to an embodiment of the present invention will be described below with reference to the drawings.

[0031] 1 is a perspective view showing the appearance of an electric burner 1 according to this embodiment. There are no structural limitations on the size of the electric burner 1, but in this embodiment, it has dimensions and weight that can be held by hand.

[0032] The electric burner 1 is connected to a power source via a control panel 2, and is supplied with power regulated by the control panel 2. A conventionally well-known compressor (not shown) is connected to the inlet 15 of the electric burner 1, and room temperature air is sent to the burner at a predetermined pressure.

[0033] As will be described later, electric burner 1 receives power from electric heater unit 20 via control panel 2, heats air introduced through inlet 15, and emits hot air from outlet 16. The temperature of the hot air emitted from electric burner 1 depends on the amount of power supplied, and electric burner 1 according to this embodiment can emit ultra-high temperature hot air up to 1150°C when supplied with, for example, 4.5 kW of power.

[0034] The control panel 2 is connected to a so-called commercial power supply (100V to 200V) and can supply power to the electric burner 1 by power control that adjusts the voltage. The control panel 2 is also connected to a first sensor 41, a second sensor 42, and a third sensor 43, which will be described later, and can perform control according to the temperature state of each sensor.

[0035] <Structure of an electric burner> FIG. 2 is a side cross-sectional view of the electric burner 1 according to this embodiment.

[0036] As shown in Figure 2, the electric burner 1 generally comprises an outer casing 10 having an inlet 15 and an outlet 16, an insulator 21 provided within the outer casing 10 and having a plurality of through holes 22 that extend from the inlet 15 side to the outlet 16, and an electric heating rod 23 inserted into the through holes 22.

[0037] The electric burner 1 is constructed by combining an exterior body 10 and an electric heater unit 20. The electric unit 20 is combined by fixing a back plate 30, which will be described later, to the base end side plate portion of the exterior body 10 with screws. In this state, a partition holding plate 25 is fitted into the middle plate portion 19 of the exterior body 10, and the partition holding plate 25 separates space A from space B. The electric burner 1 is formed with space A, space B, and space C, which are connected when the exterior body 10 is combined with the electric heater unit 20. In addition, the electric burner 1 is

[0038] <Exterior structure>

[0039] FIG. 3 is a side cross-sectional view of the exterior body 10 according to this embodiment.

[0040] As shown in Fig. 3, the exterior body 10 constitutes the external appearance of the electric burner 1 and is designed to ensure the safety and efficiency of the burner by taking into consideration heat resistance and durability. The exterior body 10 has a roughly cylindrical shape and has an inlet 15 for introducing air from the outside of the exterior body 10 and an outlet 16 for receiving and discharging the air introduced from the inlet 15 via a through-hole 22 in an insulator 21 of an electric heater unit 20, which will be described later. Except for the inlet 15 and the outlet 16, the exterior body 10 has an airtight structure that airtightly separates the inside and outside of the exterior body 10 when the electric heater unit 20 is attached.

[0041] The inlet 15 is provided on the peripheral side surface of the base end of the exterior body 10, and the exterior body 10 has a nipple 14 extending outward in the circumferential direction from the periphery of the inlet 15. The outlet 16 is provided at the end of the tip end of the exterior body 10, protruding in the shape of a nozzle.

[0042] The outer casing 10 also has three cylindrical sections 11 to 13 arranged concentrically with gaps between them, a base end side plate section 17 provided on the base end side of the cylindrical sections 11 to 13, a tip end side plate section 18 provided on the tip end side of the cylindrical sections 11 to 13, an exhaust nozzle 31 provided so as to protrude from the tip end side plate section 18 towards the tip end and having an exhaust outlet 16, and a middle plate section 19 provided between the base end side plate section 17 and the tip end side plate section 18 near the base end.

[0043] In this embodiment, the three concentric cylindrical portions 11 to 13 will be described as, from the outside, a first cylindrical portion 11, a second cylindrical portion 12, and a third cylindrical portion 13. The base end side plate portion 17, the tip end side plate portion 18, and the middle plate portion 19 are formed in an annular plate shape.

[0044] The first cylindrical portion 11 forms the outer shell of the exterior body 10 and extends cylindrically. A base end side plate portion 17 extends inward continuously around the entire circumference of the base end of the first cylindrical portion 11. A tip end side plate portion 18 extends inward continuously around the entire circumference of the tip end of the first cylindrical portion 11. Furthermore, a middle plate portion 19, to which a partition holding plate 25 of the electric heater unit 20 can be attached, extends inward continuously from the first cylindrical portion 11 between the base end side plate portion 17 and the tip end side plate portion 18 of the first cylindrical portion 11 near the base end.

[0045] An inlet 15 and a nipple 14 extending circumferentially outward from the periphery of the inlet 15 on the outer peripheral surface are provided in a portion between the base end of the first cylindrical portion 11 and the middle plate portion 19. A space A into which air is introduced from the inlet 15 is formed between the base end side plate portion 17 and the middle plate portion 19 (see FIG. 2). The middle plate portion 19 is formed in the shape of an annular plate, and supports a partition holding plate 25 of the electric heater unit 20 by fitting into it.

[0046] The second cylindrical portion 12 extends cylindrically at a predetermined interval so as to be concentric inside the first cylindrical portion 11. The space between the first cylindrical portion 11 and the second cylindrical portion 12 forms a first flow path 10a through which air introduced from the inlet 15 flows. An air vent 31c is provided in the portion of the middle plate portion 19 that communicates with the flow path 10a.

[0047] The entire circumference of the base end of the second cylindrical portion 12 is connected to the surface of the tip side of the middle plate portion 19, and the second cylindrical portion 12 is formed to extend toward the tip side from the middle plate portion 19. In addition, a tip side flow path 10b through which air can circulate is formed between the tip of the second cylindrical portion 12 and the tip side plate portion 18.

[0048] The third cylindrical portion 13 extends cylindrically at a predetermined interval so as to be concentric inside the second cylindrical portion 12. A second flow path 10c through which air introduced from the inlet 15 flows is formed in the space between the second cylindrical portion 12 and the third cylindrical portion 13.

[0049] Additionally, the third cylindrical portion 13 is provided at a position facing the annular middle plate portion 19 when viewed in the longitudinal direction. The entire circumference of the tip of the third cylindrical portion 13 is provided continuous with the tip side plate portion 18. Additionally, a base end side flow path 10d is formed between the base end of the third cylindrical portion 13 and the middle plate portion 19, through which air can circulate.

[0050] In the electric burner 1, a first flow path 10a through which air flows is formed between the first cylindrical portion 11 and the second cylindrical portion 12, and a second flow path 10c through which air flows is formed between the second cylindrical portion 12 and the third cylindrical portion 13 located inside it. The flow paths 10a, 10b, 10c, and 10d form a series of flow paths from the space A through the vent hole 31c to the space B, forming a double air insulation structure.

[0051] Air introduced from inlet 15 flows from space A into the first flow path through vent hole 31c in mid-plate 19, then flows into second flow path 10c through distal flow path 10b. The air then flows from the distal end to the proximal end in the second flow path, and is introduced into space B through proximal flow path 10d.

[0052] The first flow path 10a and the second flow path 10c provided in the exterior body 10 form a double air insulation structure, which acts as a heat shielding and cooling area for blocking heat from the electric heater unit 20 and preventing overheating of the outer circumferential surface of the exterior body 10, and also acts as a heat exchange area for heating the air flowing through the second flow path 10c with the heat from the electric heater 20. These structures improve the overall energy efficiency of the electric burner.

[0053] The exterior body 10 further has a cylindrical heat insulator 33 provided along the inner periphery of the third cylindrical portion 13 and the inner periphery of the discharge nozzle 31, and a metal inner tube 34 provided along the inner periphery of the heat insulator 33. The inner tube 34 is removably provided so as to protrude from the base end of the heat insulator 33. However, the inner tube 34 may also be provided so as to be flush with the end portion of the heat insulator 33 on the base end side.

[0054] In the electric burner 1, the insulator 21 of the electric heater unit 20 is provided inside the inner cylinder 34, and the inner cylinder 34 fills the gap between the insulator 21 and the heat insulator 33, preventing air leakage from the insulator 21. This allows the insulator 21 to be stably held in the exterior body 10, and prevents leakage of heat received from the electric heating rod 23.

[0055] <Structure of electric heater unit> FIG. 4 is a top cross-sectional view of the electric heater unit 20 according to this embodiment, FIG. 5 is a front view of the insulator 21 according to this embodiment, and FIG. 6 is a rear view of the electric burner 1. As shown in FIG.

[0056] The electric heater unit 20 is a device for heating air, housed within the exterior body 10. The electric heater unit 20 of this embodiment can be replaced by removing it from the exterior body 10.

[0057] As shown in Figures 4 and 5, the electric heater unit 20 has an insulator 21, an electric heating rod 23 inserted into its through hole 22, a partition holding plate 25 through which part of the electric heating rod 23 passes and holds the electric heating rod 23, and a back plate 30 attached to the base end side plate portion 17 of the outer casing 10.

[0058] The insulator 21 has a plurality of through holes 22, and the electric heating rods 23 are inserted into the through holes 22. Gaps are formed between the through holes 22 and the electric heating rods 23 to allow air to pass through. The through holes 22 have the same shape and cross-section dimensions, and the electric heating rods 23 have the same shape and cross-section dimensions. As a result, the gaps formed by the through holes 22 and the electric heating rods 23 extend linearly with the same cross-section, so that the air passing through the gaps is heated uniformly and efficiently by the electric heating rods 23.

[0059] In this embodiment, the electric heater unit 20 has a plurality of insulators 21 arranged inside the heat insulator 33 via the inner tube 34 of the exterior housing 10, and each insulator 21 has a circular base shape and a plurality of through holes 22 that penetrate from one end face to the other end face so as to be arranged approximately uniformly on the circular cross section. In this embodiment, 52 through holes 22 are provided, and are arranged in a triangular lattice pattern on the end face (see FIG. 5).

[0060] The insulator 21 is provided inside the inner cylinder 34 of the exterior body 10 and has through holes 22 with a roughly circular cross section. Electric heating rods 23 with a roughly circular cross section are inserted into these through holes 22 and are heated by power supplied from the control panel 2. The heated electric heating rods 23 heat the air flowing through the through holes 22. In this embodiment, the gap formed by the circular through holes 22 and the circular electric heating rods 23 extends linearly with an annular cross section, so that the air passing through the gap is heated uniformly and efficiently by the electric heating rods 23.

[0061] The insulators 21 are arranged along the inner circumference of the third cylindrical portion 13 of the thermal insulator 33. A space B into which air is introduced from the exterior body 10 is formed between the base-most insulator 21 and the middle plate portion (see FIG. 2). A space C is formed at the tip of the tip-most insulator 21 for guiding air heated by the electric heater unit 20 to the discharge nozzle 31 and the discharge port 16 (see FIG. 2). The insulators 21 are thicker at their peripheral edges than at their center so that they are I-shaped in a side cross-sectional view, and adjacent insulators 21 come into contact at their peripheral edges, forming a gap in the center.

[0062] The electric heater unit 20 of this embodiment includes, as electric heating rods 23, long electric heating rods 23a that are relatively long and short electric heating rods 23b that are shorter than the long electric heating rods 23a. The long electric heating rods 23a extend from the space C through the insulator 21, penetrating the partition holding plate 25, and to the back panel 30. The short electric heating rods 23b extend from the space C to the space B through the through-holes 22 of the insulator 21.

[0063] Each electric heating rod 23 is connected at its front end to another electric heating rod 23 by a connecting part 23c. Also, each electric heating rod 23 is connected at its rear end to another electric heating rod 23 by a connecting part 24. All electric heating rods 23 are connected by the connecting parts 23 and 24 to form a series of electric circuits.

[0064] The electric heater unit 20 has five long electric heating rods 23a and 47 short electric heating rods 23b, and the base ends of two of the long electric heating rods 23a are each connected to electrodes 35 provided on the back panel 30. The electrodes 35 are each connected to the power supply of the control panel 2.

[0065] The other three of the long electric heating rods 23a are arranged in through holes 22 provided near the outer circumferential surface of the insulator 21. The base ends of these long electric heating rods 23a are fixed to the back panel 30 by fasteners 33 provided on the back panel 30.

[0066] Furthermore, a compression coil spring 34 is inserted through the long electric heating rod 23a and provided between the fixture 33 and the partition holding plate 25 of the middle plate 19. When the partition holding plate 25 is attached to the middle plate 19, the compression coil spring 34 urges the partition holding plate 25 against the middle plate 19.

[0067] The partition holding plate 25 has a flange that covers the middle plate 19 from the base end side, and is fitted into the middle plate 19. A compression coil spring 34 is provided around a long electric heating rod 23a (described later) that is provided in the space A, in the area between the fixture 33 and the partition holding plate 25 of the middle plate 19. When the partition holding plate 25 is attached to the middle plate 19, the compression coil spring 34 urges the partition holding plate 25 against the middle plate 19 (see FIG. 2).

[0068] The electric burner 1 according to this embodiment has first to third temperature sensors 41 to 43 as temperature measuring means. In this embodiment, the first to third temperature sensors 41 to 43 are so-called thermocouples. A thermocouple has a pair of metal wires connected at their tips, and temperature measuring sections 41a to 43a are formed at the connection. In particular, the first and second temperature sensors are platinum thermocouple sensors.

[0069] The first temperature sensor 41 is inserted into the through-hole 22 of the insulator 21, and the temperature measuring part 41a is disposed so as to protrude toward the tip end of the insulator 21 that is disposed closest to the tip end. The first temperature sensor 41 can measure the temperature of the air in the space C, i.e., the temperature of the air discharged from the outlet 16. The first sensor 41 is preferably a platinum thermocouple, as it detects high temperatures on the outlet 16 side.

[0070] The second temperature sensor 42 is inserted into the through-hole 22 of the insulator 21, and the temperature measuring part 42a is disposed in the gap between the second and third insulators 21 from the base end side. The second temperature sensor 42a can measure the temperature inside the electric heater unit 20 (mainly the insulator 22).

[0071] The third temperature sensor 43 has a temperature measuring section 43a that protrudes from the back panel 30 into the space A between the back panel 30 and the middle panel section 19, and can measure the temperature of the air introduced through the inlet 15.

[0072] The base ends of the first to third temperature sensors 41 to 43 are connected to a control panel 2 that converts the thermoelectromotive force generated in the temperature measurement section into temperature. The control panel 2 can control the power supplied to the electric heating rod 2 based on the temperatures measured by the first to third temperature sensors 41 to 43. This enables the electric burner 1 to achieve efficient and stable heating and allows temperature adjustment according to the application.

[0073] <Electric heating rod> FIG. 7 is a plan view of an electric heating rod member 60 according to this embodiment.

[0074] As shown in Figure 7, a pair of electric heating rods 23 are formed from a U-shaped electric heating rod member 60. That is, the straight sections 60I of the U-shaped electric heating rod member 60 correspond to each electric heating rod 23, and the curved sections 60U of the electric heating rod member correspond to the connecting sections 23c of the electric heating rods 23. The electric heating rod member 60 is a metal rod made of an iron-chromium alloy or a nichrome alloy, and its outer diameter is smaller than the inner diameter of the through-hole of the insulator. In this embodiment, the electric heating rod member 60 has a cross section with a diameter of 2.3 mm.

[0075] When assembling the electric heater unit 20, the straight sections 60I of the electric heating rod members 60 are inserted into adjacent through-holes 22, and the curved sections 60U are held by the tip surfaces of the insulators 22. At the base ends, the base ends of the short electric heating rods 23b are connected to each other by connecting members 24. The base ends of the short electric heating rods 23b are also connected to the portions of the long electric heating rods 23a arranged in space B by connecting members 24. The long electric heating rods 23a and the short electric heating rods 23a are electrically connected in series by the connecting sections 23 and connecting members 24.

[0076] In this embodiment, five U-shaped electric heating rod members 60a formed by a long electric heating rod 23a and a short electric heating rod 23b, and 21 U-shaped electric heating rod members 60b formed by two short electric heating rods 23b are used.

[0077] <Operation of electric burner> When the electric burner 1 is operated, first, power is supplied from the control panel 2 to the electric heater unit 20 to heat the electric heating rod 23. After that, when the electric heating rod 23 is in a sufficiently heated state, air is sent from a compressor (not shown) to the inlet 15. The state in which the electric heating rod 23 is sufficiently heated can be detected by the second sensor 42.

[0078] 2 again, air introduced into inlet 15 flows from space A through vent hole 31c, then through flow path 10a, flow path 10b, flow path 10c, and flow path 10d, in that order, before reaching space B. Furthermore, the air that has reached space B is pressurized by a compressor (not shown), so it passes through the gap formed by through-hole 22 and electric heating rod 23 and reaches space C. Note that the air introduced into space A is pressurized by the compressor (not shown) and urges partition retaining plate 25 against middle plate portion 19, thereby increasing the airtightness of each of spaces A and B.

[0079] When passing through the gap formed by the through-holes 22 and the electric heating rods 23, the air receives heat from the heated electric heating rods 23 and becomes hot. Note that a gap is provided between adjacent insulators 22, and the heated air remains in this gap, stabilizing the pressure of the air flowing through the gap.

[0080] The air that reaches the space C is discharged from the outlet 16. In this embodiment, the electric burner 1 is supplied with 2.5 kW to 4.0 kW of power at a line voltage of 80 V to 107.33 V from the control panel 2. This enables the electric burner 1 to discharge air at ambient temperature to 1150°C from the outlet 16. The temperature of the air discharged from the outlet 16 is also affected by the pressure of the air introduced from a compressor (not shown).

[0081] Even when the electric burner 1 emits air at 1150°C from the outlet 16, the double air insulation structure can keep the outer surface temperature of the exterior body 10 to around 50°C. Furthermore, the air passing through the flow paths (particularly flow path 10c) that form the double air insulation structure is heated by the heat from the insulator 21 before reaching space B. This can improve the energy efficiency of the electric heater unit 20.

[0082] In the embodiment of the present invention, the electric burner 1 is described as receiving air from a compressor, heating the air, and discharging it at a high temperature. However, the electric burner may be configured to heat and discharge gases other than air, such as hydrogen, nitrogen, decomposition products of ammonia, argon gas, etc.

[0083] In the embodiment of the present invention, the through holes 22 and the electric heating rods 23 have been described as having circular cross sections and extending linearly. However, the through holes 22 and the electric heating rods 23 may have different shapes, such as polygonal cross sections such as triangular, rectangular, or hexagonal, or may have star-shaped or elliptical cross sections. Furthermore, the through holes 22 and the electric heating rods 23 may have different cross-sectional shapes.

[0084] In this embodiment, a configuration has been described in which an exterior body having a double thermal insulation structure is used in combination with an electric heater unit having an electric heating rod. However, an exterior body having a double thermal insulation structure may be used in combination with an electric heater unit that uses a spiral-shaped electric heating wire as a heating element, and an electric heater unit having an electric heating rod may be used in combination with a normal exterior body that does not have a double thermal insulation structure.

[0085] The above detailed description is intended to provide specific embodiments of the present invention and is not intended to limit the scope of the present invention. Various changes and modifications can be made within the scope of the present invention based on the teachings of the embodiments. Such changes and modifications are also included within the scope of the present invention. [Industrial Applicability]

[0086] The present invention can be used in an electric burner that emits high-temperature hot air. [Explanation of symbols]

[0087] 1 electric burner 2 Control panel 10. Exterior body 10a First flow path 10b Second flow path 10c Third flow path 10d Fourth Stream 11 First cylindrical portion 12 Second cylindrical portion 13 Third cylindrical section 14 nipples 15 Introduction 16 Outlet 17 Proximal side plate part 18 Tip side plate 19 Middle plate 20 Electric heater unit 21 Insulator 22 Through hole 23 Electric heating rod 24 Connecting member 25 Partition partition retaining plate 30 Back plate 31 nozzles 33 Insulator 34 Inner cylinder 35 electrodes 41 First Sensor 42 Second Sensor 43 Third Sensor 60 Electric heating rod member 60I Straight section 60U curved section

Claims

1. An electric burner that introduces gas from an inlet, heats the gas, and discharges it from an outlet, an exterior body provided with the inlet and the outlet; an insulator provided in the exterior body and having a plurality of through holes penetrating from the inlet side to the outlet side; A plurality of electric heating rods are inserted into the through holes and heated by passing electricity through them, The gas introduced from the inlet passes through a gap between the through hole and the electric heating rod, is heated, and is discharged from the outlet.

2. The pair of electric heating rods are made of U-shaped electric heating rod members, 2. The electric burner according to claim 1, wherein a pair of straight portions of the electric heating rod member are inserted into the pair of through holes.

3. The through holes of the insulator have the same shape and cross-section dimensions, 2. The electric burner according to claim 1, wherein the plurality of electric heating rods have the same shape and cross-section dimensions.

4. a hollow cylindrical portion that holds the insulator inside the exterior body; a flow path through which the air introduced from the inlet is sent on the outer periphery of the cylindrical portion, The electric burner according to claim 1 , wherein the flow passage forms an air-insulating structure between the cylindrical member and the outer casing.

5. 5. The electric burner according to claim 4, wherein the flow passage forms a double thermal insulation structure.

6. a first sensor provided to protrude toward the outlet of the insulator; a second sensor provided at the center between the inlet and outlet of the insulator; 2. The electric burner of claim 1, further comprising a third sensor provided on the inlet side of the insulator.

7. 2. The electric burner according to claim 1, wherein after the electric heating rod is energized, a second sensor provided at the center of the inlet and the outlet of the insulator operates to introduce gas from the inlet after a predetermined temperature is reached.

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