JPS6311557Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a freezing prevention device for water heaters.

In order to safely use a water heater such as an instantaneous gas water heater in a cold region, it is generally necessary to provide a water drain device to drain residual water from the water heater after use. However, this draining requires a considerable amount of time and effort, so the draining operation is often stopped midway through without being able to confirm that the water has been completely drained. Therefore, among the water supply and hot water supply pipes of the water heater, residual water in the form of water droplets remains attached to the thin pipes, horizontal pipes, and the like, which are particularly difficult to drain. In extreme cases, for example, the more water-repellent the pipe wall is, the more these water droplets will aggregate and grow. That is, Figures 1 and 2
As shown in the figure, most of the water supply and hot water supply pipes for water heaters are made up of metal drawn pipes or synthetic resin molded pipes 1', so these inner walls 2' have smooth surfaces. Because of this, it is extremely water repellent. Therefore, a large amount of water droplets a' are generated on the inner wall 2',
Since these water droplets a' coagulate and grow, they freeze and close the pipe 1'.

This invention was made with the aim of eliminating such conventional drawbacks, and it is
By making the inner wall of the hot water supply pipe hydrophilic through physical or chemical treatment, water can flow through the pipe during draining, reducing adhesion and agglomeration of water droplets. To provide an antifreeze device for a water heater that prevents pipes from being frozen and blocked by residual water.

An example of this will be explained below based on the drawings.
In Figures 3 and 4, 1 is a pipe such as a drawn metal pipe or a molded synthetic resin pipe, and 2 is a pipe 1.
The inner wall 3 is a water-absorbing porous coating layer made of metal sintered body, metal or inorganic fiber, etc., and is integrally attached to the inner wall 2 of the pipe 1 by pasting or other means. There is. Therefore, since the inner wall 2 of the pipe line 1 can be made hydrophilic, the flow of water during draining is promoted, and the amount of water droplets a that adhere to and remain on the inner wall 2 of the pipe line 1 after draining is small. Furthermore, since water is absorbed and diffused by the porous coating layer 3 with water absorption properties applied to the inner wall 2, there is no possibility of agglomeration and growth of the water, so that the pipe 1 is not blocked by freezing due to residual water after water is drained. There isn't. Note that, in place of the porous coating layer 3, the same effect can be obtained even if the two inner walls are roughened by etching or the like.

As explained above, this idea has an extremely simple structure in which the inner walls of the water supply and hot water supply pipes in water heaters are made hydrophilic through physical or chemical treatment, and the pipes become clogged due to freezing after water is drained. Since this problem can be prevented, it can be used safely especially in cold regions.

[Brief explanation of the drawing]

1 and 2 are sectional views of a conventional example, and FIGS. 3 and 4 are sectional views showing an embodiment of this invention. DESCRIPTION OF SYMBOLS 1... Pipeline, 2... Inner wall, 3... Porous coating layer, a... Water droplet.

Claims (1)

[Scope of utility model registration request] A freezing prevention device for a water heater, characterized in that the inner wall of the water supply or hot water supply pipe in the water heater is made hydrophilic by physically applying a porous coating or chemically treating the inner wall of the water supply pipe.