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Built-in heater for thermoacoustic systems and composite heater including the same

A composite heater, thermoacoustic system technology, applied in air heaters, fluid heaters, lighting and heating equipment, etc., can solve problems such as breakage, affecting heater performance and long-term reliability

Active Publication Date: 2019-08-13
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of the internal heating method is that the working gas is directly in contact with the surface of the hot heating wire for heating. Since the gas repeatedly impacts the heating wire back and forth in the thermoacoustic system, the heating wire is prone to breakage when it is close to the melting point at high temperature. Can affect heater performance and long-term reliability

Method used

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  • Built-in heater for thermoacoustic systems and composite heater including the same
  • Built-in heater for thermoacoustic systems and composite heater including the same
  • Built-in heater for thermoacoustic systems and composite heater including the same

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Such as Figure 1-Figure 2 As shown, the built-in ceramic heater for the thermoacoustic system consists of 6 (N=6) concentric annular structures 1, 6 fluid flow channels 2, a central cylinder 3, and a cross-shaped connecting frame 4. The central cylinder can be perforated to insert a thermocouple to measure the heater temperature in real time. Six concentric annular structures with different diameters are placed concentrically with the central cylinder to form a concentric multi-circle loop structure, and there are six annular fluid flow channels between the concentric multi-circle loops.

[0040] The cross-shaped connecting frame 4 adopts interference fit to connect all concentric annular structures in a specific way as follows: the cross-shaped connecting frame has a height of 2mm, and the diameter of the middle circle of the connecting frame is the same as the central cylinder of the heater. There are ceramic plates extending to the inner diameter of the outermost r...

Embodiment 2

[0044] Such as image 3 As shown, the built-in ceramic heater for the thermoacoustic system consists of 6 (N=6) concentric annular structures 1, 6 fluid channels 2, a central cylinder 3, and a straight-shaped connecting frame 4. The central cylinder can be perforated to insert a thermocouple to measure the heater temperature in real time. Six concentric annular structures with different diameters are placed concentrically with the central cylinder to form concentric multi-circle loops, and there are six annular fluid channels between the concentric multi-circle loops.

[0045] The inline-shaped connecting frame 4 adopts welding to connect all the concentric annular structures in the specific manner as follows: the inline-shaped connecting frame is composed of several alloy blocks, and the ceramic material on the surface of the concentric annular structure is pre-metallized, and then the inline-shaped The alloy block in the connecting frame is placed in the fluid flow channel ...

Embodiment 3

[0047] Such as Figure 4 As shown, the built-in ceramic heater for the thermoacoustic system is composed of 6 concentric annular structures 1, 6 fluid flow channels 2, a central cylinder 3, and a connecting frame 4 in the shape of a three-pointed star. The central cylinder can be perforated to insert a thermocouple to measure the heater temperature in real time. Six concentric annular structures with different diameters are placed concentrically with the central cylinder to form concentric multi-circle loops, and there are six annular fluid channels between the concentric multi-circle loops.

[0048] The three-pointed star-shaped connecting frame 4 adopts interference fit to connect all concentric annular structures in the following specific ways: the height of the connecting frame is 2mm, the diameter of the middle circle is the same as the central cylinder of the heater, and the horizontal direction and the horizontal direction are plus or minus 120 There are ceramic plates...

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Abstract

The invention discloses a built-in heater for thermoacoustic systems and a composite heater including the same. The built-in heater includes one or more sub-heaters; the sub-heaters include N concentric annular structures (1), a center cylinder (3) and a connecting frame (4); the N concentric annular structures (1) are in concentric arrangement from small to large to form a concentric multi-ring loop according to the sizes of diameters; the center cylinder (3) is arranged in the center of the concentric multi-ring loop; the connecting frame (4) fixedly connects to the N concentric annular structures (1) and the center cylinder (3); a fluid flow channel (2) is formed between any two concentric annular structures in the concentric multi-ring loop; electric heating wires are buried in the surfaces of the concentric annular structures on one or two sides of the two sides of the fluid flow channels (2); and when the built-in heater is the multiple sub-heaters, the sub-heaters can be connected to each other through the cooperation of bosses and grooves. The built-in heater is reliable for a long time and convenient in assembling and dismounting.

Description

technical field [0001] The patent of the present invention mainly relates to a built-in ceramic heater for a thermoacoustic system. The heater can be used as a form of hot-end heat exchanger for heating of moving and non-moving fluids inside pipes of various thermoacoustic systems. Background technique [0002] The thermoacoustic effect refers to the time-average energy conversion that occurs when the compressible fluid working medium (the first medium) undergoes acoustic vibrations in the thermoacoustic system and the solid working medium (the second medium) undergoes thermal interaction. effect. It is caused by the interaction between the solid working medium in the sound field and the oscillating fluid working medium, which generates time-average heat flow and time-average work flow along (or against) the sound propagation direction within a certain range from the solid wall. A thermoacoustic system is a system that can convert heat and sound based on the thermoacoustic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24H3/00F24H9/18
CPCF24H3/002F24H9/1863F24H2250/02
Inventor 谢秀娟刘丰豪杨少柒
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI