JP2019027630A - Infrared radiation heater - Google Patents

Abstract

To radiate far-infrared ray efficiently, in an infrared radiation heater configured to radiate infrared ray from a radiation pipe.SOLUTION: An infrared radiation heater comprises: a combustor configured to combust air-fuel mixture obtained by mixing fuel and air, to emit heat; a combustion chamber having a combustion space for combusting the combustor; a roughly U-shaped first bent pipe having a space connected to the combustion chamber and communicating with the combustion space; and a radiation pipe having a space communicating with the first bent pipe, and configured to radiate far-infrared ray mainly having a wavelength of 3-10 μm to the outside of the pipe with heat transferred from the first bent pipe; and a discharge pipe having a space communicating with the radiation pipe, and configured to discharge air having passed through the radiation pipe to the outside. For the radiation pipe, a ratio (L/D) of a length L of a straight portion of the pipe to an inner diameter D of the pipe is within a range of 6.2 to 8.4.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an infrared radiation heater.

  There is known an infrared radiation heater including a burner that burns a mixture of fuel and air in a combustion chamber, and a bypass-shaped radiation circuit (radiation tube) that is connected to one of the combustion chambers to emit infrared rays. (For example, refer to Patent Document 1).

  As another type of infrared radiation heater, there is known a radiation type heater having a combustion cylinder in which one end is connected to a radiation unit including a plurality of radiation tubes for heat radiation and arranged in a zigzag manner, and the other end is provided with a burner. (For example, refer to Patent Document 2).

JP-A-5-39924 JP 2008-64409 A

  By the way, in an infrared radiation heater, in order to efficiently warm a human body containing a lot of moisture, it is desirable to emit a lot of far infrared rays having a wavelength of 3 to 10 μm. When the far-infrared ray having the above wavelength is irradiated from the radiation tube, the temperature of the radiation tube becomes 300 to 400 ° C.

  In the infrared radiation heater that radiates infrared rays from the radiation tube, the temperature of the combustion chamber heated by the burner becomes 500 to 600 ° C. From the radiant tube heated to 500 to 600 ° C., a lot of short wavelength infrared rays are emitted. In the infrared radiation heater, the temperature of the radiation tube gradually decreases as the distance from the combustion chamber increases. That is, in order to radiate more far-infrared rays with the above wavelengths to the outside, it is desirable to increase the surface area of the portion where the temperature of the radiation tube is 300 to 400 ° C.

  However, conventional infrared radiation heaters such as Patent Document 1 or Patent Document 2 do not consider increasing the amount of far-infrared radiation radiated by the configuration such as the shape and length of the radiation tube.

  An object of the present invention is to efficiently emit far infrared rays in an infrared radiation heater that emits infrared rays from a radiation tube.

The present invention includes a combustion device that generates heat by burning an air-fuel mixture in which fuel and air are mixed, a combustion chamber that has a combustion space for burning the combustion device, and a space that is connected to the combustion chamber and communicates with the combustion space. A first curved pipe having a substantially U-shaped pipe, and a pipe having a space communicating with the first curved pipe. A radiation pipe that radiates to the outside, and a pipe having a space communicating with the radiation pipe, and a discharge pipe that discharges the air that has passed through the radiation pipe to the outside. The direction is arranged in a substantially horizontal direction, and includes a first cylindrical portion connected to the first curved pipe, and the inner diameter D of the first cylindrical portion and the length L of the straight portion of the first cylindrical portion are:
L / D = 6.2 to 8.4
Range.

  In the present invention, the radiation tube may include a second curved tube that is a substantially U-shaped tube connected to the first cylindrical portion.

  In the present invention, the radiating tube may include a second cylindrical portion that is arranged vertically above the first cylindrical portion in the substantially horizontal direction and connected to the first cylindrical portion.

  In the present invention, the discharge pipe may include a flow rate limiting unit that limits the flow rate when the air is discharged to the outside.

  ADVANTAGE OF THE INVENTION According to this invention, in an infrared radiation heater which radiates infrared rays from a radiation tube, far infrared rays can be efficiently radiated.

It is a perspective view which shows the infrared radiation heater which concerns on embodiment of this invention. It is a front view of the infrared radiation heater of FIG. It is a right view of the infrared radiation heater of FIG. It is a schematic diagram which shows the internal structure of the infrared radiation heater of FIG. It is a schematic diagram which shows the combustion chamber of the infrared radiation heater of FIG. 1, a radiation | emission part, and a discharge pipe. It is a schematic diagram which shows the U-shaped radiation tube of the infrared radiation heater of FIG. It is a schematic diagram which shows the functional structure of the radiation | emission part and discharge pipe of an infrared radiation heater.

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

[Configuration of infrared radiation heater]
FIG. 1 is a perspective view showing an infrared radiation heater 1 according to an embodiment of the present invention. FIG. 2 is a front view of the infrared radiation heater 1. As shown in FIGS. 1 and 2, the infrared radiation heater 1 includes a frame 2, a panel 3, a mesh portion 4, a caster 5, a switch 6, and a fuel tank 7 as components exposed to the outside. And a chimney 8.

  In the following description, the surface on which the mesh portion 4 of the infrared radiation heater 1 is provided is the front surface, and the surface opposite to the front surface (the surface viewed from the back surface of the paper in FIG. 1) is the back surface. The surface facing the installation surface of the infrared radiation heater 1, that is, the surface on which the casters 5 and the fuel tank 7 are provided is defined as the bottom surface.

  The infrared radiation heater 1 has a substantially rectangular parallelepiped shape. The infrared radiation heater 1 has a substantially rectangular shape in which the length in the vertical direction (height direction) is shorter than the length in the horizontal direction when viewed from the front.

  FIG. 3 is a side view of the infrared radiation heater 1. As shown in FIG. 3, the infrared radiation heater 1 has a substantially rectangular shape in which the length in the horizontal direction (depth direction) is shorter than the length in the vertical direction in a side view.

  The frame 2 accommodates main components of the infrared radiation heater 1 such as a combustion device, a combustion chamber, and a radiation tube. The frame 2 forms a substantially rectangular parallelepiped outer shape of the infrared radiation heater 1. The frame 2 is made of a metal material that is resistant to high temperatures and that is suitable for housing components that become hot when the infrared radiation heater 1 is used, such as a combustion chamber or a radiation tube.

  The panel 3 covers the internal structure of the infrared radiation heater 1 from the outside. The panel 3 is made of, for example, a metal plate-like member in order to withstand heat from a combustion chamber and a radiation tube described later.

  As shown in FIG. 2, the mesh part 4 is a mesh-like opening provided in a part of the panel 3 in order to radiate infrared rays from the radiation part 11 to the outside, for example.

  The casters 5 are attached near the four corners of the bottom of the frame 2. Since the caster 5 is provided with wheels, the infrared radiation heater 1 can be easily moved by being manually pushed by the user. In the infrared radiation heater 1, the leg portion for supporting the apparatus on the installation surface may have no wheel instead of the caster 5 with the wheel.

  The switch 6 accepts operations of the infrared radiation heater 1 such as ON / OFF of operation, combustion intensity and temperature setting from the user. The switch 6 includes a control unit that controls the operation of the infrared radiation heater 1 according to the accepted operation. The switch 6 is desirably provided at a position where the user can easily operate, for example, an upper position on the panel 3.

  As shown in FIG. 4, the fuel tank 7 is provided below the combustion device 9, the combustion chamber 10, and the radiation unit 11, that is, at the bottom of the infrared radiation heater 1. The fuel tank 7 stores fuel for the infrared radiation heater 1 such as kerosene. The fuel tank 7 has a shape in which the direction along the bottom surface of the frame 2 that is long in the horizontal direction in the front view is the longitudinal direction.

  A cap 72 is attached to the fuel tank 7 at the fuel filler opening. The cap 72 is exposed to the outside from an oil supply opening 71 provided on the right side of the frame 2. When fuel is supplied to the fuel tank 7, fuel is injected from the fuel filler port from which the cap 72 is removed.

  A tank cover 73 that covers the fuel tank 7 from the bottom and protects the fuel tank 7 is provided at the bottom of the infrared radiation heater 1. The tank cover 73 is formed by molding a hard plate member such as a steel plate by bonding or pressing. The tank cover 73 is formed in a trapezoidal shape in a side view with a portion corresponding to a substantially columnar lower bottom surface opened.

[Infrared radiation heater internal structure]
Next, the internal structure of the infrared radiation heater 1 will be described.

  FIG. 4 is a schematic diagram showing the internal structure of the infrared radiation heater 1. As shown in FIG. 4, the infrared radiation heater 1 includes a combustion device 9, a combustion chamber 10, a radiation portion 11, and a discharge pipe 12 inside a frame 2.

  The combustion device 9 is disposed below the frame 2 of the infrared radiation heater 1. The combustion device 9 includes a nozzle, a fan, a fuel pump, and the like, which will be described later, and sends and mixes fuel such as kerosene and air into the combustion chamber 10 and burns the mixture in the combustion chamber 10.

  The combustion chamber 10 is formed using a material that can withstand a temperature of about 800 ° C., stainless steel (for example, SUS302B) having a thickness of about 0.8 mm, and the like. The combustion chamber 10 has a combustion space for burning the air-fuel mixture inside the combustion chamber 10 such as a substantially cylindrical shape formed hollow. The combustion space inside the combustion chamber 10 has a temperature of about 800 ° C. when the combustion device 9 is burned.

  FIG. 5 is a schematic diagram showing the combustion chamber 10, the radiating portion 11, and the exhaust pipe 12 of the infrared radiation heater 1. As shown in FIG. 5, the radiating portion 11 is a tubular member having a space inside the tube wall. One end of the radiating unit 11 is connected to the combustion chamber 10. The radiating unit 11 has an internal space communicating with a combustion space inside the combustion chamber 10. The radiating portion 11 is formed using a material that can withstand a temperature of at least about 600 ° C., stainless steel (for example, SUS304) having a plate thickness of about 0.3 mm, as in the combustion chamber 10.

  FIG. 6 is a schematic diagram showing the U-shaped radiation tube 14 constituting the radiation unit 11. As shown in FIG. 6, the U-shaped radiation tube 14 has a bellows portion 141 and a straight tube portion 142. The radiation part 11 is configured by using the bellows part 141 and the straight pipe part 142 of the two U-shaped radiation tubes 14 in combination with each other. The inner diameter D of the U-shaped radiation tube 14 is, for example, 100 mm. The length L of the straight portion of the U-shaped radiation tube 14 is, for example, 835 mm. The U-shaped radiation tube 14 includes a bellows portion 141 and a straight tube portion 142 that are integrally formed. Note that the bellows portion 141 and the straight pipe portion 142 may be formed individually and then integrally formed by welding or the like.

  The bellows portion 141 is a substantially U-shaped tube having a space inside. The bellows portion 141 can be adjusted in the degree of bending of a substantially U shape to improve assemblability and the like. The straight pipe part 142 is a cylindrical pipe having a space communicating with the bellows part 141.

  The tube wall of the radiating unit 11 is heated by transferring heat generated by the combustion device 9 inside the combustion chamber 10. As a result, infrared rays are radiated from the tube wall of the radiation portion 11 to the outside of the infrared radiation heater 1.

  One end of the discharge pipe 12 is connected to the other end of the radiating section 11 opposite to the side connected to the combustion chamber 10. The discharge pipe 12 has a space communicating with the radiating portion 11. The exhaust pipe 12 is formed using a material that can withstand a temperature of at least about 600 ° C., for example, stainless steel (SUS304), like the combustion chamber 10 and the radiating portion 11. The inner diameter of the discharge pipe 12 is, for example, 100 mm, similar to the inner diameter of the U-shaped radiation pipe 14.

[Configuration of radiation section and discharge pipe]
Next, the functional configuration of the radiation section 11 and the discharge pipe 12 of the infrared radiation heater 1 will be described.

  FIG. 7 is a schematic diagram showing a functional configuration of the radiation section 11 and the discharge pipe 12 of the infrared radiation heater 1. As described above, the radiating unit 11 is configured by combining two U-shaped radiating tubes 14, but in the following description, depending on the temperature at the time of heating the radiating unit 11, the wavelength of emitted infrared rays, and the like. The parts of the radiation part 11 are classified as follows.

  The first curved pipe 111 is connected to the combustion chamber 10 and communicates with the combustion space of the combustion chamber 10. The first curved tube 111 is closer to the combustion chamber 10 than the radiation tube 112. Therefore, the first bent tube 111 is heated at about 500 ° C., which is higher than that of the radiation tube 112. Near infrared rays having a shorter wavelength than far infrared rays (3 to 10 μm) are radiated from the first bent tube 111 heated at about 500 ° C. to the outside.

  As shown in FIG. 7, the radiation tube 112 is classified into a first tubular portion 113, a second curved tube 114, and a second tubular portion 121 for each function of emitting infrared rays.

  The first tubular portion 113 is disposed in the substantially horizontal direction in the vertical direction above the combustion chamber 10 and is connected to the first curved pipe 111. The first tubular portion 113 is a straight pipe having a space communicating with the first curved pipe 111. The first tubular portion 113 is heated to approximately 300 to 400 ° C., which is a lower temperature than the first curved tube 111, due to heat transmitted from the first curved tube 111. The first cylindrical portion 113 heated to approximately 300 to 400 ° C. radiates far infrared rays having a wavelength of 3 to 10 μm to the outside of the tube mainly by heat transmitted from the first curved tube 111.

  As shown in FIG. 6, for example, the first tubular portion 113 has a straight portion having a length L of approximately 835 mm. As described above, the first cylindrical portion 113 is formed of a cylindrical tube having an inner diameter of D100 mm.

For this reason, as for the 1st cylindrical part 113 in the radiation tube 112, the internal diameter D of a pipe | tube and the length L of the linear part of a pipe | tube become the relationship of the following formula | equation.
L / D = 8.35

  Here, in the infrared radiation heater 1, the cylindrical radiation tube 112 is heated by the heat of the combustion chamber 10 connected to one end of the radiation tube 112 in the axial direction to emit infrared rays. For this reason, in the infrared radiation heater 1, the surface temperature of the radiation tube 112 decreases as the axial distance from the combustion chamber 10 increases. That is, in the radiation tube 112 of the infrared radiation heater 1, the position of the region heated to 300 to 400 ° C. that irradiates far infrared rays is determined by the axial distance from the combustion chamber 10. Further, in order to increase the region irradiated with far infrared rays, the surface area of the radiation tube 112 in the region where far infrared rays can be irradiated is important.

  And in the infrared radiation heater 1, when the ratio of the length of L and D has the above relationship, the 1st cylindrical part 113 can increase the area heated to about 300-400 degreeC. . When the ratio of the lengths of L and D is in such a relationship, the first cylindrical portion 113 can efficiently radiate far infrared rays mainly having a wavelength of 3 to 10 μm to the outside of the tube.

In consideration of the above conditions, the relationship between the length ratios of L and D is
L / D = 6.2 to 8.4
It is desirable to be within the range.

  The second curved tube 114 is a substantially U-shaped tube that connects the first tubular portion 113 and the second tubular portion 121. The second curved pipe 114 has a space communicating with the first cylindrical portion 113 and the second cylindrical portion 121. The second bent tube 114 is heated to a temperature lower than that of the first tubular portion 113 by heat transmitted from the first tubular portion 113. The second curved tube 114 radiates far infrared rays having a wavelength of mainly 3 to 10 μm to the outside of the tube by heat transmitted from the first cylindrical portion 113.

  The second tubular portion 121 is arranged in a substantially horizontal direction in the vertical direction above the first tubular portion 113 and is connected to the first tubular portion 113. The second cylindrical portion 121 is a straight pipe having a space communicating with the second curved pipe 114. The second tubular portion 121 is heated to approximately 200 ° C., which is a lower temperature than the second curved tube 114, by the heat transmitted from the second curved tube 114.

  The discharge pipe 12 is connected to the other end opposite to the one end connected to the combustion chamber 10 of the radiating portion 11. The discharge pipe 12 has a space communicating with the radiating portion 11. The exhaust pipe 12 is formed using a material that can withstand a temperature of at least about 600 ° C., for example, stainless steel (SUS304), like the combustion chamber 10 and the radiating portion 11. The inner diameter of the discharge pipe 12 is, for example, 100 mm, similar to the inner diameter of the U-shaped radiation pipe 14.

  The discharge pipe 12 has a space that communicates with the radiation pipe 112. The discharge pipe 12 discharges air (hot air) that has passed through the radiating unit 11 to the outside. As shown in FIG. 4, the other end of the discharge pipe 12 is provided with a chimney 8 for discharging warm air to the outside. From the discharge pipe 12, infrared rays due to heat passing through the radiation pipe 112 are also emitted. The discharge pipe 12 includes a bent portion 122 and a flow rate limiting portion 13.

  The bent portion 122 is provided above the first bent tube 111 in the vertical direction, and is bent from a substantially horizontal direction to a substantially vertical direction. The inner diameter of the bent portion 122 is, for example, 100 mm, similar to the inner diameter D of the U-shaped radiation tube 14 used for the radiation portion 11 and the discharge tube 12.

  The flow rate limiting unit 13 is provided at the other end of the discharge pipe 12, that is, at the end of the discharge pipe 12 on the chimney 8 side. The flow rate limiting unit 13 is provided inside the discharge pipe 12. The flow rate limiting unit 13 is provided with a plurality of holes in the tube wall of a tube having an inner diameter smaller than the inner diameter of the discharge tube 12. The flow rate restriction unit 13 restricts the flow rate of the discharged air by an inner diameter smaller than that of the discharge pipe 12. Moreover, the flow velocity limiting unit 13 obtains a silencing effect by the tube wall and the hole in the tube wall. For this reason, the flow velocity limiting unit 13 functions as a silencer.

[Effect of the embodiment]
According to the infrared radiation heater 1 according to the present embodiment described above, the surface area of the first tubular portion 113 of the radiation tube 112 that radiates far infrared rays to the outside can be increased. For this reason, according to the infrared radiation heater 1, the amount of the far infrared rays to be radiated can be increased without increasing the output of the combustion device 9 or increasing the exclusive area of the radiation tube 112 in the front view. As a result, according to the infrared radiation heater 1 according to the present embodiment described above, compared with the case where the relationship between the inner diameter D and the length L of the first cylindrical portion 113 of the radiating portion 11 is not in the above range, Fuel consumption can be suppressed.

  Specifically, in the infrared radiant heater of the reference example in which the inner diameter of the tube of the first cylindrical portion of the radiating portion is 70 mm and the length of the first cylindrical portion is X mm, the combustion device 9 having the same output as the infrared radiant heater 1 is used. When trying to obtain an equivalent amount of heat using, the fuel consumption is 2.2 l / h. On the other hand, the fuel consumption of the infrared radiation heater 1 under the same conditions is 2.0 l / h.

  Therefore, according to the infrared radiation heater 1, the performance of heating can be improved efficiently.

  Moreover, according to the infrared radiation heater 1 demonstrated above, since the flow velocity restriction | limiting part 13 which restrict | limits the flow velocity of the air discharged | emitted by the discharge pipe 12 is provided, heating is carried out by lengthening the residence time of the air in the radiation | emission part 11. Performance can be improved.

1: Infrared radiation heater 2: Frame 3: Panel 4: Mesh part 5: Caster 6: Switch 7: Fuel tank 8: Chimney 9: Combustion device 10: Combustion chamber 11: Radiation part 12: Exhaust pipe 13: Flow rate restriction part 14 : U-shaped radiation tube 71: Refueling opening 72: Cap 73: Tank cover 111: First curved tube 112: Radiation tube 113: First tubular portion 114: Second curved tube 121: Second tubular portion 122: Bent Part 141: Bellows part 142: Straight pipe part

Claims (4)

A combustion device for generating heat by burning a mixture of fuel and air; and
A combustion chamber having a combustion space for burning the combustion device;
A first curved pipe which is a substantially U-shaped pipe having a space connected to the combustion chamber and communicating with the combustion space;
A radiation tube that has a space communicating with the first curved pipe, and radiates far-infrared rays having a wavelength of 3 to 10 μm mainly to the outside of the pipe by heat transmitted from the first curved pipe;
A pipe having a space communicating with the radiation pipe, and a discharge pipe for discharging the air via the radiation pipe to the outside;
With
The radiation tube is
A first cylindrical portion that is arranged in a substantially horizontal direction in the vertical direction above the combustion chamber and is connected to the first curved pipe;
With
The inner diameter D of the first cylindrical portion and the length L of the straight portion of the first cylindrical portion are:
L / D = 6.2 to 8.4
The range of
Infrared radiation heater. The radiation tube is
A second bent pipe which is a substantially U-shaped pipe connected to the first tubular portion;
Comprising
The infrared radiation heater according to claim 1. The radiation tube is
A second cylindrical portion that is arranged in a substantially horizontal direction in the vertical direction above the first cylindrical portion, and is connected to the first cylindrical portion;
Comprising
The infrared radiation heater according to claim 2. The discharge pipe is
A flow rate limiting unit for limiting the flow rate when discharging the air to the outside;
Comprising
The infrared radiation heater according to claim 1 or 2.