Heat source apparatus
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Solution Overview
Problem
Conventional heat source apparatuses experience poor sealing properties due to the expansion of packing materials during compression, which reduces the compression stress and allows combustion gas to leak.
Innovation Solution
The integration of water tubes on the side plate of the combustion box, which contact the packing and prevent its expansion, enhancing compression stress and sealing properties by directing compression forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packing is used to seal the through-hole, then sealing function is provided, but the packing expands peripherally during compression resulting in insufficient compression stress and poor sealing properties
Solution Approach 1:
The water tubes act as intermediary structures that contact the peripheral surfaces of the packing. When the clamp compresses the packing, the water tubes serve as mediators that redirect the compressive force, preventing peripheral expansion and ensuring sufficient compression stress is applied to the packing's sealing surfaces.
Solution Approach 2:
The water tubes, being fluid-conducting components, are positioned to contact the packing's peripheral surfaces. The rigid structure of the water tubes provides mechanical constraint that prevents the packing from expanding laterally during compression, thereby maintaining compression stress on the sealing surfaces.
2Reliability
If clamp is fastened to compress packing, then sealing function is enhanced, but packing expands in peripheral direction reducing compression stress
Solution Approach 1:
The water tubes serve as intermediary constraint structures between the clamp and the packing. When the clamp applies compressive force, the water tubes act as intermediaries that limit peripheral expansion of the packing, ensuring the packing maintains its compressed shape and provides effective sealing.
Solution Approach 2:
The water tubes are positioned specifically at locations where peripheral expansion occurs. By providing localized constraint at these critical points, the water tubes prevent shape distortion of the packing while allowing compression to be applied, thereby maintaining both shape stability and sealing function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures sufficient compression stress within the packing, thereby achieving good sealing properties and preventing gas leakage.
Implementation Method 1
a water jacket disposed in that portion of the combustion box which lies between the burner and the heat exchanger, the water jacket being connected to the heat exchanger in order to cool the combustion box
Implementation Method 2
in a state in which a packing is interposed between the flange portion and the one-side side plate, a clamp which overlaps with an outside surface of the flange portion is fastened to the one-side side plate
Data Source
Figure 1
Figure 2
Figure 3
AI summary
[Problems] In a heat source apparatus in which an electric component (6) having an electrode (63) and an insulator (642) is mounted on a side plate (21) of a combustion box (2), in a state in which a packing (65) is interposed between a flange portion (64a) of the insulator (642) and the side plate (21), by fastening to the side plate (22) a clamp (66) which overlaps with an outer surface of the flange portion (64a), the packing (65) is prevented from getting spread when compressed, thereby securing good sealing properties. [Solving Means] Upper and lower water tubes (53) constituting a part of a water jacket are disposed on upper and lower sides of the mounting position of the electrode component (6) on a side plate (21). In case the upper and lower water tubes (53) are disposed on an inside surface of the side plate (21), upper and lower side edge portions of the packing (65) are in contact with those upper and lower swelled-out portions (53a) formed in the one-side side plate which are swollen outward for respectively receiving into recesses the upper and lower water tubes (53); and that, in case the upper and lower water tubes (53) are disposed on an outside surface of the side plate (21), upper and lower side edge portions of the packing (65) are in contact with the upper and lower water tubes (53).