JP2009002621A - Infrared radiation generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an infrared radiation generating device capable of suppressing distortion and cracks of a radiator plate. <P>SOLUTION: The infrared radiation generating device 10 is provided with a shell 12s having an opening part 12a on the front side and used for forming a chamber 12; a fan 13 for introducing air to inside of the chamber 12; a burner 20 for burning fuel by using at least part of air introduced from the fan 13 to the chamber 12; and the porous radiator plate 30 provided so as to cover the opening part 12a of the shell 12s. A plurality of holes 34 and at least one slit 35 are formed on the radiator plate 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an infrared ray generator that emits infrared rays.

Patent Document 1 discloses a liquid fuel combustion infrared generator. In this infrared ray generator, a nozzle spray burner is attached to the rear part of the combustion cylinder. Further, in this infrared ray generator, a perforated metal plate having a large number of holes perforated substantially uniformly is attached to the front surface of the combustion cylinder. This type of infrared ray generator burns liquid fuel in a combustion cylinder (chamber, combustion chamber) and emits infrared rays from the front surface of a perforated metal plate (heat radiating plate).
Japanese Patent Laid-Open No. 5-322120

  In the heat sink provided in the infrared ray generator, stress is generated due to deformation caused by various factors including distortion during molding and radiant heat. In recent years, there has been a demand for a small-sized and high-power infrared generator, but in such an infrared generator, the amount of thermal deformation of the heat sink becomes larger. Therefore, the generated stress becomes larger. For this reason, if the infrared generator is further reduced in size and / or increased in output, it is likely that the heat sink is likely to reach a relatively high temperature due to thermal stress during use (ON) or repeated ON / OFF stress. There is a concern that the shape will change around the center of the shape, and in some cases, cracks may occur due to metal fatigue (thermal fatigue) due to repeated deformation.

  In addition, as a heat sink, the center part is curved forward and the attachment part (attachment area, edge, fixed) is fixed to a member (shell) that is bent outward to form a chamber Part). When such a heat sink is formed by press working or the like (press-molded), for example, the peripheral mounting portion and the amount of deformation in the vicinity thereof are large, and residual stress during processing is relatively difficult to remove. Furthermore, since the periphery is shaped to ensure strength, thermal stress tends to concentrate. Further, the periphery of the heat radiating plate is fixed to the front end portion of the shell having a different material or heating condition as a mounting portion by screws or the like. Therefore, the periphery of the heat sink and the vicinity thereof are portions where a large stress is likely to occur compared to other regions, and distortion and cracks are likely to occur. However, conventionally, the periphery of the heat radiating plate has a structure that is less likely to reach a high temperature compared to the center, and there are few cases in which the influence of thermal fatigue appears significantly. If the infrared generator is small and high-powered or has a structure that can raise the temperature of the entire heat sink, distortion or cracking may occur in areas that were not a problem with conventional heat sinks, such as the vicinity of the heat sink and its vicinity. There is.

  On the other hand, it is necessary to provide the heat sink with a predetermined size and number of holes for appropriately adjusting the amount of combustion gas released (differential pressure when the combustion gas is released). The strength of can be affected. Therefore, there is a need for a heat sink and an infrared ray generator provided with the heat sink that have a small influence on these pores and can suppress distortion and cracks in various places of the heat sink.

  One aspect of the present invention is an infrared generator that includes an open portion in the front, a shell for forming a chamber, a fan for introducing air into the chamber, and a fan introduced into the chamber. A burner that burns fuel using at least part of the air and a porous heat radiating plate provided to cover the open portion of the shell. In this infrared ray generator, a plurality of holes and at least one slit are formed in the heat radiating plate.

  In this infrared ray generator, liquid fuel sprayed or vaporized by a burner is combusted in a chamber (in a combustion cylinder, a combustion chamber), and the heat sink is heated by contact with radiant heat and the heated combustion gas. Infrared rays are emitted from the front. In this infrared generator, the multiple holes in the heat sink function to properly adjust the amount of combustion gas released from the chamber (differential pressure when the combustion gas is released) to control the temperature of the heat sink Also works.

  In this infrared ray generator, at least one slit is formed in the heat radiating plate in addition to the plurality of holes. At least one slit of the heat radiating plate is not mainly intended to adjust the amount of combustion gas released from the chamber, but absorbs thermal deformation (rather than hindering thermal deformation) and is due to thermal deformation. The purpose is to suppress the generation of stress. In the heat radiating plate in which a plurality of holes are formed, by forming a slit in a portion where stress due to thermal deformation is likely to occur, generation of stress due to thermal deformation in the vicinity thereof can be suppressed.

  Holes whose main purpose is to adjust the amount of combustion gas released from the chamber, such as a substantially circular or a substantially elliptical shape, are not only difficult to suppress the occurrence of stress due to thermal deformation, Increasing the rate may increase the amount of passage of combustion gas, increase the temperature of the heat sink, and increase the stress due to thermal deformation. On the other hand, if the hole diameter is reduced or the aperture ratio is reduced, the temperature rise of the heat radiating plate may be suppressed, but the area of the non-opening portion of the heat radiating portion that thermally expands (the area of the plate body) increases. As a result, stress easily accumulates and distortion is likely to occur. By providing the heat sink with holes that are primarily intended to adjust the amount of combustion gas released and slits that are not primarily intended to adjust the amount of combustion gas emitted, the shape of the heat sink, The positions, sizes, numbers, and the like of the plurality of holes can be arranged relatively freely, and the generation of thermal stress that increases with the possibility can be suppressed.

  In this infrared ray generator, it is preferable that at least one slit of the heat radiating plate is provided in the vicinity of the attachment portion with the shell for forming the chamber. In the infrared ray generator, the attachment portion of the heat radiating plate to the shell and the vicinity thereof are portions where thermal stress is likely to occur. Providing slits in the heat sink near the shell mounting portion can suppress the occurrence of cracks in the vicinity of the heat sink mounting portion with the shell even if the temperature in the vicinity of the heat sink mounting portion is increased. . Therefore, it is possible to raise the temperature of the entire surface of the heat sink more evenly and improve the efficiency of generating infrared rays from the heat sink.

  You may provide the slit of a heat sink radially on the part which becomes the highest temperature of a heat sink. Or you may provide the slit of a heat sink along the concentric circle centering on the part which becomes the highest temperature of a heat sink. In either case, it is possible to suppress the generation of stress due to thermal deformation of the portion of the heat sink that is at the highest temperature. Therefore, distortion can be suppressed even if the hole diameter at the highest temperature portion of the heat sink is reduced or the aperture ratio is reduced to increase the area of the non-opening. Moreover, since the ambient temperature of the heat sink can be raised, as a result, the infrared radiation efficiency of the heat sink can be improved.

  In this infrared ray generator, the holes of the heat sink can have various shapes such as a substantially circular shape, a substantially elliptical shape, a substantially oval shape, and a polygonal shape. In addition, the slits of the heat sink are cut by laser cutting, etc., elongated gaps (slot-shaped elongated openings) or elongated ellipses with a relatively large aspect ratio (more than holes for adjusting the amount of combustion gas released appropriately) Elongate oval having a large aspect ratio).

  The slit of the heat sink is not intended to adjust the amount of combustion gas released from the chamber. For this reason, it is not very preferable that the slit excessively increases the amount of released combustion gas or that the periphery of the slit becomes red-hot. Therefore, it is preferable to make the width of the slit smaller than the width (diameter) of the hole around the slit. In one form of the infrared ray generator of the present invention, the hole of the heat sink is a substantially circular hole and / or a substantially elliptic hole, the slit of the heat sink is a cut and / or an elongated gap, The width of the slit is smaller than the diameter or short diameter of the hole of the heat sink around the slit.

  In this infrared ray generator, the plurality of holes of the heat radiating plate preferably have a size (for example, a hole diameter) that changes stepwise or continuously. In manufacturing and / or processing of the heat sink, it is desirable that the sizes (for example, hole diameter) of the plurality of holes of the heat sink change stepwise. Moreover, many heat sinks are curved forward and are subjected to pressing. In manufacturing the heat sink, it is possible to make holes before pressing, but in this case, a plurality of holes may be deformed by pressing. For example, when a substantially circular hole is made before pressing, the plurality of holes may be substantially elliptical holes in the final product.

  Moreover, according to this infrared ray generator, even if the heat sink has a relatively small portion, if a slit is formed at a predetermined position, it is possible to suppress the occurrence of distortion and cracks due to thermal deformation. For this reason, the shape of a heat sink, the position of a some hole, a magnitude | size, a number, etc. can be arranged comparatively freely.

  For example, depending on the type of the burner and the shape and size of the chamber, the portion of the heat sink that is at the highest temperature may be located above the center in the vertical direction and substantially in the center in the left-right direction. When a rotary burner is used as the burner, the highest temperature portion of the heat radiating plate is located above the center in the vertical direction and substantially in the center in the horizontal direction. In such a case, in at least a partial region of the heat sink, for example, in a region including a portion having the highest temperature (main region), the plurality of holes of the heat sink are arranged from the lower side to the upper side in the vertical direction. It is preferable that the width of the slit of the heat sink is smaller than the diameter or the short diameter of the smallest hole among the plurality of holes of the heat sink. By making the plurality of holes of the heat sink smaller in the vertical direction from the lower side to the upper side and smaller in the left-right direction toward the center, the portion of the heat sink that is at the highest temperature is more than the center in the vertical direction. In the case of being located at the approximate center in the upper and left and right directions, infrared rays can be uniformly radiated forward from the heat radiating plate (the red hot portions can be uniformly formed). Even in such an arrangement, by providing a slit, distortion and cracks due to thermal deformation can be suppressed. Further, by making the width of the slit of the heat radiating plate smaller than the diameter or the short diameter of the smallest hole among the plurality of holes of the heat radiating plate, it is possible to prevent redness around the slit.

  According to this infrared ray generator, various burners can be used as the burner. An example of the infrared ray generator of the present invention employs a gun type burner (nozzle spray type burner). In this infrared ray generator, liquid fuel is sprayed from the gun type burner, and the liquid fuel is burned in the chamber. Infrared rays are emitted forward from the heat sink. Another example of the infrared ray generator of the present invention employs a rotary burner as the burner. In the rotary burner, a rotary vaporizing cylinder, a cylindrical combustion disk, and a combustion outer cylinder for forming a gas chamber between the combustion disk and the combustion disk are arranged in this order from the inside. In this infrared ray generator, liquid fuel is vaporized in a rotary vaporization cylinder, burned from a combustion plate through a gas chamber as a mixed gas together with combustion air supplied from a fan, and burned, and infrared rays are radiated forward from a heat sink. .

  Another aspect of the present invention is a heat sink provided in an infrared ray generator. The heat sink has a plurality of holes and at least one slit.

  Yet another aspect of the present invention is an infrared heating apparatus having the above infrared generator and a fuel tank for storing liquid fuel.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1: has shown the infrared heater (infrared heating apparatus) concerning the 1st Embodiment of this invention with the front view. FIG. 2 shows the infrared heater of FIG. 1 in a side view. FIG. 3 is a partial cross-sectional view of the infrared heater of FIG. In the following drawings, the upper part is indicated by an arrow X.

  As shown in FIG. 1 and FIG. 2, the infrared heater 1 includes an infrared generator 10, a housing (exterior) 2 that houses the infrared generator 10, a fuel tank 11 disposed below the housing 2, and a housing 2. And a frame 3 that supports the fuel tank 11, and wheels 4 a and legs 4 b provided on the frame 3. The housing 2 is supported by the frame 3 so as to turn (rotate) up and down (upward X and the opposite side) via the turning shaft 6. For this reason, the infrared ray generator 10 is configured so that the axis L (the line passing through the center of the chamber, the axis of the rotary vaporizer cylinder of the rotary burner 20 (rotary axis), see FIG. 3) L is substantially horizontal, and the axis L is on the upper side. It can be turned up and down (rotated) between the posture inclined so as to face. The frame 3 has a handle 5. The infrared heater 1 can be moved to an arbitrary place by using the wheel 4a by lifting the handle (handle) 5, and when the handle (handle) 5 is released, the leg portion 4b becomes a stopper and can be installed at the place. .

  The infrared ray generator 10 housed in the housing 2 is made of a metal (for example, heat resistant stainless steel) that has a front portion that is wider than the rear portion and that has an open portion 12a in the front portion to form a substantially truncated pyramid-shaped chamber 12. (Steel) shell 12s, a fan 13 provided (arranged) in the rear of the chamber 12 in the vicinity of the chamber 12, and a rear of the chamber 12 between the chamber 12 and the fan 13. The provided (arranged) burner 20 and the porous heat sink (perforated metal plate, metal plate, panel) provided (arranged) in front of the chamber 12 so as to cover the open portion 12a of the shell 12s , A heat radiating panel) 30. The heat sink 30 is made of, for example, stainless steel having heat resistance.

  The chamber 12 is formed in an open shape by the shell 12s so as to increase toward the front side. A heat insulating material 17 is disposed inside the shell 12 s, and the outer periphery of the chamber 12 is formed by a heat insulating material wall (heat insulating wall) 17. The chamber 12 is not limited to a truncated pyramid shape, and may be a truncated cone shape, a cylindrical shape, a rectangular tube shape, or the like. Further, the heat insulating material may be disposed outside the shell 12s. A suitable example of the burner 20 is a rotary burner (rotating atomizing burner). The burner 20 is housed in a housing cylinder 15 behind the chamber 12, and a fan cover 16 that houses the fan 13 and the motor 14 is disposed further rearward. The motor 14 is for rotating the fan 13. When the burner 20 is a rotary burner, the motor 14 serves as both a means for rotating the fan 13 and a means for rotating the rotary vaporization cylinder provided in the rotary burner 20.

  A safety guard 7 is attached in front of the housing 2, that is, in front of the heat sink 30. A circulator 65 for ventilating the inside of the housing 2 is attached to the upper part of the housing 2. The air A for ventilation is sucked in from the suction ports 61 and 62 provided in the lower part of the housing 2 and is discharged from the discharge port 63 provided in the upper part of the housing 2. By ventilating the inside of the housing 2, it is possible to prevent the internal temperature of the housing 2 from rising extremely. At the same time, by releasing the heated air A for ventilation from the front surface of the housing 2, the room can be heated together with the infrared rays emitted from the radiator plate 30.

  A heat shield plate 66 is disposed behind the housing 2 so as to divide the interior of the housing 2 into front and rear. A rotary burner 20 accommodated (accommodated) in the chamber 12 and the accommodating cylinder 15 is provided in front of the heat shield plate 66, and a fan 13 and a motor accommodated in the fan cover 16 are disposed behind the heat shield plate 66. 14 is provided. Therefore, in this example, the motor 14 is provided behind the rotary burner 20, and the fan 13 is provided behind the motor 14. The housing cylinder 15 housing the rotary burner 20 and the fan cover 16 housing the fan 13 and the motor 14 are respectively attached to the front and rear of the heat shield plate 66. The front side of the heat shield plate 66 is a section in which a portion that generates heat is stored, and the front section of the housing 2 is ventilated by the air A for ventilation. By separating the front and rear of the housing 2 by the heat shield plate 66 and suppressing the temperature rise behind the housing 2, heat is released to the rear of the housing 2, and the fan 13 and the motor 14 are affected by thermal expansion (thermal deformation). Can be suppressed.

  FIG. 4 shows a schematic configuration of the infrared heater of FIG. 1 in a sectional view (end view). A rotary burner 20 provided in the infrared generator 10 of the infrared heater 1 includes a cylindrical rotary vaporization cylinder 21, a cylindrical combustion disc 22, and a cylindrical combustion outer cylinder 23, which are arranged on the inner side (rotation center). ) Are arranged in this order. The rotary vaporizing cylinder 21 is a bottomed cylindrical (cup-shaped) member having a wall (end wall, bottom wall, front wall) 21a on the front side. A substantially conical diffuser 24 for guiding the liquid fuel F to the rotary vaporizing cylinder 21 is provided inside the end wall 21 a of the rotary vaporizing cylinder 21. The diffuser 24 is rotated integrally with the rotary vaporizing cylinder 21 by the motor 14. The combustion disc 22 is a bottomed cylindrical member having a wall (end wall, bottom wall, rear wall) 22a on the rear side. The end wall 22a is annular, and an opening 22b is provided at the center. A rotary vaporizing cylinder 21 is provided so as to face the opening 22b. A gap between the edge of the opening 22b and the rotary vaporizing cylinder 21 becomes a fuel scattering hole (gap) 25 in which fuel that is not vaporized at the time of startup or the like is sprayed.

  The combustion outer cylinder 23 arranged on the outside of the combustion plate 22 is also a bottomed cylindrical member having a wall (end wall, bottom wall, rear wall) 23a on the rear side. Largely formed. The end wall 23a is annular and has an opening 23b in the center, and a partition wall 23c rises from the edge of the opening 23b toward the inside of the rotary vaporizing cylinder 21. The inside of the partition wall 23 c becomes a space for supplying combustion air from the fan 13 to the rotary vaporizing cylinder 21.

  The combustion plate 22 of the rotary burner 20 is a porous member in which a plurality of holes (openings, porous holes, flame holes) 22c are arranged in a staggered manner. A space between the combustion plate 22 and the combustion outer cylinder 23 serves as a gas chamber 26 for blowing out a mixed gas in which the liquid fuel vaporized by the rotary vaporization cylinder 21 and the combustion air are mixed from the porous 22c of the combustion disk 22. .

  The rotary burner 20 is connected to the fuel tank 11 via a fuel pipe 41, and a pump 42 is provided in the middle of the pipe 41. By driving the pump 42, the liquid fuel F supplied from the fuel tank 11 is sprayed to the diffuser 24 of the rotary vaporization cylinder 21 through the fuel pipe 41. When the diffuser 24 is rotated integrally with the rotary vaporizing cylinder 21 by the motor 14, the liquid fuel F evaporates (vaporizes) while spreading in a thin film shape on the inner surface of the diffuser 24 by centrifugal force. The evaporated liquid fuel F is first blown out from the fuel scattering holes 25 and burned. Next, the vaporized liquid fuel F is mixed with the combustion air supplied from the fan 13 (see arrow Y in FIG. 4) to become a gaseous state, and the mixed gas B is discharged from the porous 22c of the combustion plate 22 through the gas chamber 26. And burns in the vicinity of the combustion plate 22.

  A flame rod 18 and an ignition rod (electrode) 19 for ignition are arranged inside the combustion disk 22. When ignited, the fuel released from the fuel scattering hole 25 provided in the rotary vaporizing cylinder 21 is ignited by the ignition rod 19. When combustion occurs in the vicinity of the combustion plate 22 and the inside of the chamber 12 is heated, a mixed gas B in which the liquid fuel F vaporized by the diffuser 24 of the rotary vaporization cylinder 21 and the combustion air is mixed is obtained. Combustion continues.

  The heat radiating plate 30 is curved so that the central portion swells forward (convexly), and is formed in a curved shape so as to project to the front as a whole. In this infrared ray generator 10, the mixed gas B obtained by vaporizing the liquid fuel F supplied from the fuel tank 11 is burned in an annular shape by the combustion plate 22 of the rotary burner 20, and heat generated by the combustion (mainly radiant heat) And heat dissipation plate 30 is heated by heat transfer by combustion gas). The combustion gas generated by the combustion heats the porous heat radiating plate 30 through the chamber 12, and is further discharged forward through the plurality of holes 34 of the heat radiating plate 30. In this infrared ray generator 10, there is heat dissipation by the emitted combustion gas, but the thermal energy obtained by the combustion of the mixed gas B is released to the outside mainly as infrared rays radiated forward from the radiator plate 30.

  The infrared ray generator 10 includes a rotary burner (rotary atomizing burner) 20, and the liquid fuel F is vaporized in the burner 20, blown out, and burned. For this reason, the combustion in the rotary burner 20 becomes blue fire combustion by the combustion of the mixed gas B which has been vaporized, and the combustion efficiency is good. Further, the mixed gas B is blown out from the cylindrical combustion disk 22 in an annular shape, and blue fire is also formed in an annular shape. Furthermore, according to the infrared ray generator 10, the mixed gas B is completely burned at a short distance. For this reason, the distance between the heat sink 30 and the rotary burner 20 can be reduced. Therefore, according to the infrared generator 10, the heat radiating plate 30 on the front surface of the chamber 12 can be efficiently heated by the rotary burner 20 having good combustion efficiency. Therefore, according to this infrared ray generator 10, since more infrared rays can be emitted with a small amount of fuel, it is suitable for the infrared heater 1, and a warm infrared heater 1 can be provided. Moreover, the rotary burner 20 that blows out and burns after the liquid fuel F is vaporized inside the burner has a relatively low operating noise.

  As shown in FIG. 4, in the infrared ray generator 10 of the present example, the rotary burner 20 is housed in the housing cylinder 15, and the air supplied by the fan 13 is interposed between the combustion outer cylinder 23 and the housing cylinder 15. A part of the air flows as cooling air D. A portion of the air supplied by the fan 13 is allowed to flow as cooling air D between the combustion outer cylinder 23 and the housing cylinder 15, thereby cooling the gas chamber 26 via the combustion outer cylinder 23 outside the gas chamber 26. And it can suppress that the temperature of the gas chamber 26 rises too much. By doing so, it is possible to suppress so-called back combustion, in which flame enters the gas chamber 26 between the combustion disc 22 and the combustion outer cylinder 23.

  Further, as described above, the housing 2 is between the posture in which the axis L of the rotary vaporizing cylinder 21 provided in the rotary burner 20 is substantially horizontal and the posture in which the axis L of the rotary vaporizing cylinder 21 is inclined upward. It is supported by the frame 3 via a turning shaft 6 so that it can turn (turn). By turning the housing 2 up and down, the direction of the heat sink 30 can be adjusted up and down.

  Means for discharging the remaining liquid fuel F as a drain are provided at the lower rear side of the combustion disk 22 and the lower rear side of the combustion outer cylinder 23, respectively. Specifically, drain holes 51 and 52 serving as discharge paths are provided at a corner portion between the combustion disc 22 and its end wall 22a and at a corner portion between the combustion outer cylinder 23 and its end wall 23a, respectively. Further, a drain pipe 53 is provided at a position facing the hole 52 in the housing cylinder 15. The drain pipe 53 communicates with the fuel tank 11 via a pipe (tube) 54. Even when the infrared heater 1 is used in a posture in which the axis L of the rotary vaporizing cylinder 21 is substantially horizontal, it is also used in a posture in which the axis L of the rotary vaporizing cylinder 21 is inclined so as to face upward. Even in this case, the liquid fuel F remaining in the rotary burner 20 can be returned to the fuel tank 11 from the lower rear side of the combustion disk 22 and the lower rear side of the combustion outer cylinder 23. For this reason, liquid fuel does not easily accumulate as drain inside the rotary burner 20, particularly below the combustion plate 22 and the combustion outer cylinder 23, and the drain or vaporization thereof occurs at the time of ignition, extinguishing, ignition failure, etc. It can suppress that a component is discharge | released as an unburned part or that a drain oozes out behind the rotary burner 20 via a motor shaft etc. The infrared heater 1 can be tilted up to 30 degrees.

  FIG. 5 shows a front view of an example of the heat sink 30 provided in the infrared ray generator 10. FIG. 6 shows a part of the heat radiating plate in FIG. 5 in a cross-sectional view and the other part in a top view (plan view). 6 is a view cut along the line VI-VI in FIG. FIG. 7 shows a part of the heat radiating plate of FIG. 5 in a longitudinal section and the other part in a side view. FIG. 7 is a view cut along the line VII-VII in FIG.

  The heat radiating plate 30 includes a heat radiating portion (infrared radiation portion, heat radiating region, heat radiating portion) 31 and a mounting portion (edge portion, mounting region, mounting portion) 32 surrounding the heat radiating portion 31. The heat dissipating part 31 is a part used for radiating (dissipating) infrared rays, so that the central part swells forward in the vertical direction so that the central axis forms part of a horizontally placed cylindrical member ( Curved (convexly) (see FIGS. 6 and 7). The attachment part 32 is a part used for screwing the heat radiating plate 30 to the front end part 12b (see FIG. 3) of the opening part 12a of the shell 12s, and the periphery of the heat radiating part 31 is folded outwards like a frame. It has a shape that supports the heat dissipation part 31. The attachment portion 32 is provided with two screw holes 33 in the lower portion 32a, two in the upper portion 32b, and one in each of the left side portion 32c and the right side portion 32d.

  The heat radiating plate 30 of the infrared ray generator 10 of the present example includes a heat radiating portion 31 having a length of about 390 mm and a width of about 500 mm, and in a region of about 360 mm in the center of the heat radiating portion 31 and about 425 mm in width, and / or A plurality of substantially elliptical holes 34 are formed. In addition to the plurality of holes 34, the heat dissipating part 31 is formed with a plurality of slits 35 such as elongated gaps. The slit 35 is preferably about 1 to 3 mm in width and about 10 to 30 mm in length. The heat radiating plate 30 is formed by forming a plurality of holes 34 and a plurality of slits 35 (perforating) and then press-molding so that the central portion swells forward in the vertical direction (upward X and opposite side). Yes. In the heat radiating plate 30, a circular hole to be a hole 34 is formed before pressing. For this reason, after the press molding, the hole 34 may be substantially elliptical. The slit 35 may be formed by laser cutting before or after press molding.

  By changing the hole diameter and the arrangement density (opening ratio), the plurality of holes 34 controls the pressure difference between the pressure in the chamber 12 and the outside world (differential pressure when released) by the location of the heat radiating portion 31, and radiates heat. This is for appropriately adjusting the amount of combustion gas released from the portion 31. In this example, a rotary burner is used as the burner 20. In this case, the highest temperature portion C2 of the heat sink 30 is located above the center C1 of the heat sink 30 (intersection of the axis L and the heat sink 30). More specifically, the highest temperature portion C2 of the heat radiating plate 30 is located above the center in the vertical direction (X direction) and substantially at the center in the horizontal direction.

  For this reason, the size of the plurality of substantially circular or slightly flat holes 34 provided in the heat radiating plate 30 is changed stepwise to make the temperature of the heat radiating portion 31 as uniform as possible. It tries to make the intensity of the infrared rays radiated forward to be uniform. Specifically, in the heat radiating portion 31 of the heat radiating plate 30, in almost the whole area except for the vicinity of the left end, the vicinity of the right end, and the vicinity of the lower end, the plurality of holes 34 are directed from the lower side to the upper side (X direction) in the vertical direction. In particular, the hole diameter gradually decreases from the lower side toward the center, and in the left-right direction, the hole diameter decreases gradually toward the center. When the plurality of holes 34 are formed so that the hole diameter gradually decreases from the lower side to the upper side (X direction) in the vertical direction and gradually decreases in the left-right direction toward the center, In a region near the left end, near the right end, and near the lower end of 31, a hole 34 having a relatively large hole diameter is formed. In order to increase the strength of the peripheral portion of the heat radiating plate 30, the holes for two rows in the left end, the right end, and the lower end, in this example, the holes for two rows are made smaller than the adjacent holes on the center side.

  Specifically, the plurality of holes 34 provided in the heat radiating plate 30 are classified into three sizes. The smallest first hole 34a has a diameter (minor axis) of 2.8 mm, and is formed in a total of about 384 along a concentric circle (virtual circle) centering on the portion C2 that is the hottest. Yes. Further, the smallest first hole 34a is further formed in a region on the upper side (X direction) from the outermost concentric circle (imaginary circle). The second smallest second hole 34b has a diameter (minor diameter) of 5.2 mm, and is arranged in two rows on the left and right sides of the region where the hole 34a is formed, and on the left end, the right end, and the bottom end. A total of about 227 are formed. The third smallest third hole (largest hole) 34c has a diameter (minor diameter) of 6.2 mm, and a total of about 306 holes are formed on the left and right sides of the region where the hole 34b is formed. Yes. That is, the region where the hole 34c is formed is surrounded by the region where the hole 34b is formed. Therefore, as described above, the plurality of holes 34 of the heat radiating plate 30 have a hole diameter that decreases in the vertical direction from the lower side to the upper side (X direction) in the most vertical direction. In, the hole diameter decreases toward the center.

  When the heat radiating plate 30 in which holes are distributed in a plurality of diameters as described above is employed, the red hot part extends substantially evenly in the porous region in the upper, lower, left and right directions, and the area where the temperature of the heat radiating plate 30 increases can be expanded. According to the infrared generator 10 provided with the heat radiating plate 30, high-temperature hot air (combustion gas) generated by the combustion in the vicinity of the combustion plate 22 is biased above the chamber 12 and concentrated above the heat radiating plate. As a result, it is possible to suppress the occurrence of a problem that the red heat region is limited and the generation amount of infrared rays does not increase. That is, the heat sink 30 in which holes having different diameters are distributed can appropriately adjust the discharge amount of the combustion gas (differential pressure when released), and the release of the combustion gas is large around the heat sink 30. It is thought that it can be reduced in the center and less in the upper part. As a result, it is possible to suppress the high-temperature combustion gas from being unevenly distributed upward in the chamber 12, average the distribution of the high-temperature combustion gas, and promote the heating around the heat sink 30. It is possible to radiate infrared rays forward (to form a red hot part uniformly).

  Further, in such a heat radiating plate 30, the portion C <b> 2 having the highest temperature and the vicinity thereof have a larger amount of thermal deformation than other portions. Furthermore, by adopting the arrangement of the holes 34 as described above, the opening ratio of the holes 34 is reduced, and the area of the non-opening portion (the heat sink main body and the heat resistant stainless steel plate portion) of the heat radiating portion 31 is increased. Distortion caused by thermal deformation, looseness due to repeated thermal deformation, and the like become conspicuous. Therefore, in order to absorb thermal deformation and suppress the generation of stress, the slit 35 is formed in the vicinity of the portion C2 where the temperature is highest.

  Specifically, for example, a total of 28 first slits 35a each having a width of 2 mm and a length of 22.5 mm are formed radially with the highest temperature portion C2 of the heat radiating plate 30 as the center. The first slit 35a has the highest temperature in the vertical direction (the direction connecting the 90 ° position and the 270 ° position at an angle with respect to the horizontal direction Y passing through the portion C2 (the same applies hereinafter)). Three are formed on the upper side and three on the lower side with the center C2 interposed therebetween, and the center C2 having the highest temperature is sandwiched in the left-right direction (the direction connecting the 180 ° position and the 0 ° position). Thus, three are formed on the left side and three on the right side. Further, in the oblique direction, two are formed radially with the center C2 having the highest temperature in between. That is, the first slit 35a has a 30 ° direction, a 60 ° direction, a 120 ° direction, a 150 ° direction, a 210 ° direction, a 240 ° direction, a 300 ° direction, 330 in the oblique direction. Two pieces are formed along the direction of °.

  Further, for example, the second slit 35b having a width of 2 mm and a length of 15.0 mm has a direction of 30 °, a direction of 60 °, a direction of 120 °, a direction of 150 °, a direction of 210 °, a direction of 240 °, 300 A total of eight lines are formed on the outer side of the first slit 35a along the direction of ° and the direction of 330 °. Due to the slit 35 (slit 35a and slit 35b), the surrounding metal (the non-opening portion of the heat radiating portion 31 and the heat radiating plate body) is likely to thermally expand / contract, and stress due to thermal deformation is less likely to occur. The slit 35 suppresses the generation of stress due to thermal deformation of the heat sink 30 in the vicinity of the highest temperature portion C2 of the heat sink 30, so that the heat sink 30 becomes hot during use or is repeatedly turned on and off. However, the occurrence of distortion and cracks in this portion is suppressed.

  In addition, the heat radiating plate 30 has an edge-shaped attachment portion (attachment region, edge portion, fixing portion) 32 by bending the periphery of the heat radiating portion 31 outward by pressing. For this reason, the attachment portion 32 and its vicinity have a relatively large residual stress during processing. Further, since the heat radiating plate 30 is screwed to the shell 12s at the attachment portion 32, the attachment portion 32 becomes a fixed end. Therefore, if there is no slit, thermal deformation is hindered in the vicinity of the attachment portion 32, so that a greater stress is likely to be applied than in other regions. In particular, in the heat radiating plate 30 of this example, the temperature of the entire area of the heat radiating portion 31 is increased. Therefore, the temperature of the peripheral mounting portion 32 is also likely to increase. If that portion is fixed, the thermal stress is high. Prone.

  Further, in order to make the temperature of the heat radiating portion 31 uniform, the holes 34 (holes 34b and 34c) of the heat radiating portion formed in the vicinity of the lower portion 32a of the mounting portion 32 have a large diameter and a high aperture ratio. . In particular, compared with the vicinity of the upper portion 32b of the mounting portion 32 on the opposite side, the hole 34 (mainly the hole 34a) formed in the vicinity of the upper side is small, the aperture ratio is low, and the strength is high. In the vicinity of the lower portion 32a of 32, if the strength is low and the thermal stress is high, cracks (material breakage) are likely to occur.

  In the heat radiating plate 30 of the present example, the periphery of the heat radiating plate 30 is below the heat radiating portion 31 and in the vicinity of the lower portion 32 a of the mounting portion 32, more specifically, a portion slightly closer to the center than the screw hole 33. Two third slits 35c having a width smaller than the diameters of the holes 34b and 34c, for example, a width of 2 mm and a length of 22.5 mm, are formed so as to extend in the vertical direction. Since these slits 35 (slits 35c) suppress the generation of stress due to thermal deformation in the vicinity of the lower portion 32a of the attachment portion 32, the heat sink 30 becomes hot during use or is repeatedly turned on and off. Even if this occurs, the occurrence of distortion and cracks in this portion is suppressed.

  FIG. 8 shows another example of the heat sink 30. In this example, in addition to the first to third slits 35a to 35c, an arcuate fourth slit 35d is formed along a concentric circle (virtual circle) having the center C2 as the highest temperature portion of the radiator plate 30. is doing. Since the slit 35d absorbs thermal deformation in the vicinity of the center C2 at the highest temperature, the slits 35a and 35b may be omitted in this case. In addition, the slit provided in the heat sink 30 may be only an arc shape formed along a concentric circle.

  As described above, according to the infrared ray generator 10, the slit 35 is formed in the heat radiating plate 30 in addition to the hole 34. For this reason, it is hard to produce distortion and a crack, and the pattern of the hole 34 of the heat sink 30 can be set comparatively freely. Therefore, by arranging the pattern of the holes 34 of the heat sink 30 as described above, the overall temperature of the heat sink 30 is raised, and the intensity of infrared rays radiated forward from the heat sink 30 is made uniform over the entire area of the heat sink. can do. In particular, in the infrared ray generator 10 that employs the rotary burner 20 and is configured such that the rotary burner 20 and the heat radiating plate 30 face each other, the distribution of the combustion gas tends to be symmetrical, and is relatively simple as described above. The pattern of the hole 34 can be adopted, and the heat sink 30 provided with such a hole pattern is excellent in appearance and good in appearance. Therefore, such a heat sink 30 is suitable for the infrared ray generator 10 that employs the rotary burner 20. Furthermore, by adopting the rotary burner 20, it is possible to provide the infrared ray generator 10 having high combustion efficiency and low operating noise. Further, by employing this infrared ray generator 10, it is possible to provide an infrared heater 1 that is warmer with a small amount of combustion and that has a relatively low operating noise.

  FIG. 9: has shown schematic structure of the infrared heater (infrared heating apparatus) concerning the 2nd Embodiment of this invention with sectional drawing (end view). In addition, FIG. 9 is a figure seen from the top, and the direction in which the heat sink 30 is provided is the front side.

  In the infrared generator 10 provided in the infrared heater 1, an opening 12c is provided on the side of the shell 12s that forms the chamber 12, and the burner 70 is exposed to the inside of the chamber 12 (combustion chamber) from the opening 12c. As shown, it is provided on the side of the chamber 12. As the burner 70, for example, a nozzle spray type burner, a so-called gun type burner can be used. In addition, the code | symbol 19a in FIG. 9 is an igniter, and the code | symbol 43 is a fuel filter. Since other configurations are the same as those of the first embodiment, overlapping description will be omitted by attaching the same reference numerals to the drawings. The infrared heater, infrared generator, and heatsink of the present invention can be applied to those in which a burner 70 is provided on the side of the chamber 12, as shown in FIG. 9, and a gun type burner is used as the burner 70. is there. That is, the heat radiating plate 30 as shown in FIGS. 5 to 7 can be applied to an infrared generator using a burner 70 on the side of the chamber 12 and an infrared generator using a gun-type burner as the burner 70. It is. In the case of an infrared generator using a gun-type burner as the infrared generator having a burner 70 on the side of the chamber 12 and the burner 70 as the burner 70, the hole 34 of the heat sink 30 has a predetermined size. You may form with a pitch. Even in this case, it is possible to radiate infrared rays almost uniformly forward from the heat radiating plate 30 (to form the red hot portions substantially uniformly).

  Since the infrared ray generator of the present invention can emit a large amount of infrared rays at low cost, it can be suitably used for a heater mainly for indoor and outdoor heating, but the application is not limited to the heater. The infrared ray generator of the present invention can be applied to other uses, for example, an apparatus intended for heating or drying.

The front view which shows the infrared heater concerning the 1st Embodiment of this invention. The side view which shows the infrared heater of FIG. The side view which shows the infrared heater of FIG. 1 in a partial cross section. The figure which shows schematic structure of the infrared heater of FIG. The front view which shows an example of a heat sink. The top view which shows the heat sink of FIG. 5 in a partial cross section. The side view which shows the heat sink of FIG. 5 in a partial cross section. The front view which shows the other example of a heat sink. The figure which shows schematic structure of the infrared heater concerning the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Infrared heater (infrared heater), 10 Infrared generator 11 Fuel tank, 12 Chamber, 12s Shell 12a Open part of shell, 13 Fan 20 Rotary burner (burner), 21 Rotary vaporization cylinder 22 Combustion board, 23 Combustion outer cylinder, 26 Gas chamber 30 Heat sink, 32 Mounting portion 34 Hole in heat sink, 35 Slit of heat sink 70 Gun type burner (burner)

Claims (10)

A shell having an opening in the front and forming a chamber;
A fan for introducing air into the chamber;
A burner that burns fuel using at least part of the air introduced from the fan into the chamber;
A porous heat sink provided so as to cover the open part of the shell,
An infrared ray generator having a plurality of holes and at least one slit formed in the heat radiating plate. In claim 1,
The heat sink is attached to the shell;
The slit of the said heat sink is an infrared rays generator provided in the vicinity of the attachment part with the said shell. In claim 1 or 2,
The slit of the said heat sink is an infrared rays generator provided radially centering on the part which becomes the highest temperature of the said heat sink. In any of claims 1 to 3,
The slit of the said heat sink is an infrared rays generator provided along the concentric circle centering on the part which becomes the highest temperature of the said heat sink. In any of claims 1 to 4,
The hole of the heat sink is a substantially circular hole and / or a substantially elliptical hole,
The slit of the heat sink is a cut and / or an elongated gap,
The infrared radiation generator, wherein a width of the slit of the heat radiating plate is smaller than a diameter or a short diameter of a hole of the heat radiating plate around the slit.   6. The infrared generator according to claim 5, wherein the size of the plurality of holes of the heat radiating plate changes in a stepwise manner. In Claim 6, in the at least one part area | region of the said heat sink, the several hole of the said heat sink becomes small as it goes to the upper side from the lower side in the up-down direction, and it becomes small as it goes to the center in the left-right direction. And
The infrared ray generating device, wherein a width of the slit of the heat radiating plate is smaller than a diameter or a short diameter of the smallest hole among the plurality of holes of the heat radiating plate. The burner according to any one of claims 1 to 7, wherein the burner is a rotary burner.
In the rotary burner, a rotary vaporization cylinder, a cylindrical combustion disc, and a combustion outer cylinder for forming a gas chamber between the combustion disc and the combustion disc are arranged in this order from the inside.
Liquid fuel is vaporized by the rotary vaporization cylinder, and burned by being blown out from the combustion plate through the gas chamber as a mixed gas together with combustion air supplied from the fan, and the heat radiating plate radiates infrared rays forward. Infrared generator.   An infrared heating apparatus comprising the infrared generator according to any one of claims 1 to 8 and a fuel tank for storing liquid fuel.   A heat radiating plate provided in an infrared ray generator, wherein a plurality of holes and at least one slit are formed.

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