JPH0311595Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a heat exchanger used in instantaneous water heaters, steam generators, etc.

(Prior art) When heat exchangers conventionally used in instantaneous water heaters, etc., heat hard water, a large amount of limestone adheres to the inside of the tube due to a decrease in the solubility of calcium carbonate in the hard water, and even if the water is not hard, soluble salts may accumulate. When heating a large amount of water, evaporation residue adheres and grows inside the tube due to local boiling.
In either case, there has been a problem that the thermal efficiency has decreased, or in extreme cases, the inside of the tube has become clogged.

(Purpose of the invention) The present invention aims to prevent the above-mentioned decrease in thermal efficiency and blockage by automatically removing scales or evaporation residues generated and attached during heating.

(Structure of the device) In order to achieve the above object, the present invention uses a shape memory alloy disorder that is disposed in the tube constituting the heat exchanger in contact with the inner wall of the tube and returns to its shape in the axial direction of the tube. It has a configuration in which Ryuko is arranged.

(Embodiment) Figures 1 and 2 are sectional views of essential parts of an embodiment of the present invention. In the figures, reference numeral 1 denotes a tube body with heat absorbing fins 2 attached to its outer periphery and through which water is passed inside. A coil-shaped turbulator 3 is disposed inside the tube in contact with the inner wall of the tube.
This coiled turbulent element 3 is normally in a contracted state as shown in FIG. be. The turbulent element 3 may be a plate-shaped element other than a coil spring.

In the above configuration, when the heat exchanger is heated by passing water, the turbulator 3 returns to its shape from the state shown in FIG. 2 to the state shown in FIG. A flow is formed, further increasing thermal efficiency. On the other hand, scales and evaporation residues generated by heating adhere to the inner wall of tube body 1, but turbulent flow element 3 contracts as shown in Figure 2 due to cooling caused by stopping heating, and expands during reheating. As a result, the deposits are peeled off from the inner wall of the tube body 1 and discharged together with water flow.

(Effects of the invention) As described above, the present invention uses the expansion and contraction action of the turbulent to remove scales, etc. that have adhered to the inner wall of the pipe, so the turbulator also serves to prevent the scales, etc. from adhering. This has the advantageous effects of simplifying the structure and ensuring removal of scales and the like by performing the operation of peeling scales and the like every time the heat exchanger is heated.

[Brief explanation of the drawing]

The drawings are sectional views of essential parts of an embodiment of the present invention, with FIG. 1 showing the heating state and FIG. 2 showing the heating stopped state. 1... tube body, 3... turbulent.

Claims (1)

[Scope of utility model registration request] It consists of a tube that forms a flow path for the water to be heated, and a turbulator made of a shape memory alloy that is disposed in the tube in contact with the inner wall of the tube and that returns to its shape in the axial direction of the tube. Features of heat exchanger.