Infrared heater and infrared processing device

Patent metadata

Field	Value
Publication number	US-10757760-B2
Application number	US-201514953566-A
Country	US
Kind code	B2
Filing date	Nov 30, 2015
Priority date	Nov 28, 2014
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

An infrared heater 10 includes a heating element 40 that emits infrared radiation when heated and that is capable of absorbing infrared radiation in a predetermined reflection wavelength range, and a filter unit 50 that is disposed so as to be separated by a first space 47, which is open to an outside space, from the heating element 40. The filter unit 50 includes one or more transmission layers (a first transmission layer 51) that transmit at least a part of the infrared radiation from the heating element 40, and a reflective section (the first transmission layer 51) that reflects infrared radiation in the reflection wavelength range toward the heating element 40.

First claim

What is claimed is:

1. An infrared heater comprising:
a heating element that emits infrared radiation when heated and that is capable of absorbing infrared radiation in a predetermined reflection wavelength range, the heating element being disposed in a case having an upper surface portion and right and left side surface portions, at least one of the side surface portions extending a first distance away from the upper surface portion to a distal end; and
a filter unit including one or more transmission layers that transmit at least a part of the infrared radiation emitted from the heating element and a reflective section that reflects infrared radiation in the reflection wavelength range toward the heating element, the one or more transmission layers including a closest transmission layer, the closest transmission layer being the transmission layer of the one or more transmission layers which is positioned closest to the heating element, and being disposed a second distance, greater than the first distance, away from the upper surface portion, thereby defining a first space between the heating element and the closest transmission layer, which is open to an outside space, via at least one opening defined between the closest transmission layer and the distal end of the at least one of the side surface portions;
wherein an infrared emissivity of a surface portion of the heating element facing the closest transmission layer is higher than that of a surface portion of the heating element facing away from the closest transmission layer.

2. The infrared heater according to claim 1 ,
wherein the closest transmission layer is a first transmission layer,
the first transmission layer also serves as at least a part of the reflective section, and
the first transmission layer has reflection characteristics of reflecting infrared radiation in the predetermined reflection wavelength range and transmits at least a part of the infrared radiation from the heating element.

3. The infrared heater according to claim 2 ,
wherein 0.08≤D/L≤0.23,
where a distance D [cm] is a distance between the heating element and the first transmission layer, a heating element area S [cm 2 ] is an area of a smallest quadrangular or circular region that surrounds an entirety of a projection region that is formed by projecting the heating element onto the first transmission layer in a direction perpendicular to the first transmission layer (where 0 cm 2 <S≤400 cm 2 ), and a representative dimension L [cm]=2×√(S/π), wherein the representative dimension L is equal to a diameter of a circle whose area is the same as the heating element area S.

4. The infrared heater according to claim 2 ,
wherein the filter unit includes a second transmission layer that is disposed so as to be separated by a second space from the first transmission layer, and that reflects at least a part of the infrared radiation emitted from the heating element and passed through the first transmission layer.

5. The infrared heater according to claim 1 ,
wherein the closest transmission layer is a first transmission layer, and further comprising a second transmission layer that is disposed so as to be separated by a second space from the first transmission layer on a side opposite to the heating element when seen from the first transmission layer,
wherein the first transmission layer transmits infrared radiation in the reflection wavelength range, and
the second transmission layer is at least a part of the reflective section, and reflects infrared radiation in the reflection wavelength range while transmitting at least a part of the infrared radiation emitted from the heating element and passed through the first transmission layer.

6. The infrared heater according to claim 5 ,
wherein the filter unit includes a partition member that partitions the second space from outside of the filter unit, and
the reflective section includes a transmission-layer-side reflective member that is at least a part of the partition member and that reflects infrared radiation in the reflection wavelength range.

7. The infrared heater according to claim 5 ,
wherein the second space is a coolant channel that allows a coolant to flow therethrough.

8. The infrared heater according to claim 1 ,
wherein 0.06≤D/L≤0.23,
where a distance D [cm] is a distance between the heating element and the closest transmission layer, a heating element area S [cm 2 ] is an area of a smallest quadrangular or circular region that surrounds an entirety of a projection region that is formed by projecting the heating element onto the closest transmission layer in a direction perpendicular to the closest transmission layer (where 0 cm 2 <S≤400 cm 2 ), and a representative dimension L [cm]=2×√(S/π), wherein the representative dimension L is equal to a diameter of a circle whose area is the same as the heating element area S.

9. The infrared heater according to claim 1 , further comprising:
a heating-element-side reflective member that is disposed on a side opposite to the one or more transmission layers when seen from the heating element and that reflects infrared radiation in the reflection wavelength range.

10. The infrared heater according to claim 1 ,
wherein the heating element is a planar heating element having a flat surface that is capable of emitting infrared radiation toward the one or more transmission layers and absorbing infrared radiation in the reflection wavelength range.

11. An infrared heater comprising:
a heating element that emits infrared radiation when heated and that is capable of absorbing infrared radiation in a predetermined reflection wavelength range, and
a filter unit including one or more transmission layers that transmit at least a part of the infrared radiation emitted from the heating element and a reflective section that reflects infrared radiation in the predetermined reflection wavelength range toward the heating element, the filter unit being disposed so as to be separated by a first space, which is open to an outside space, from the heating element,
wherein the one or more transmission layers include a first transmission layer,
the first transmission layer also serves as a part of the reflective section,
the first transmission layer includes a selective reflection region that has reflection characteristics of reflecting infrared radiation in the reflection wavelength range and that transmits at least a part of the infrared radiation emitted from the heating element and a transmission region that transmits infrared radiation in the reflection wavelength range, the selective reflection region being disposed closer than the transmission region to a center of the heating element, the transmission region being disposed farther than the selective reflection region from the center of the heating element, and
the reflective section includes a transmission-layer-side reflective member that is disposed on a side opposite to the heating element when seen from the first transmission layer and that has a reflective surface inclined with respect to a surface of the transmission region facing the heating element, the reflective surface reflecting toward the heating element infrared radiation in the reflection wavelength range passed through the transmission region.

12. The infrared heater according to claim 11 ,
wherein the transmission region of the first transmission layer is located so as to surround the selective reflection region when seen from the heating element.

13. The infrared heater according to claim 11 ,
wherein the transmission-layer-side reflective member is disposed so that the reflective surface does not overlap

Assignees

• Ngk Insulators Ltd

Inventors

• Komaki Takeshi
• Kinnan Taiki
• Kondo Yoshio

Classifications

• F26B3/30 Primary

  from infrared-emitting elements {(by radiation emanating from passages containing heated fluids other than combustion gases F26B23/10)} · CPC title

• F26B15/18

  the objects or batches of materials being carried by endless belts · CPC title

• H05B3/22

  non-flexible · CPC title

• H05B2203/032

  Heaters specially adapted for heating by radiation heating · CPC title

• H05B3/009 Primary

  heating devices not specially adapted for a particular application · CPC title