JPH0224041Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an instantaneous water heater for home use and other uses.

(Prior Art) In this type of water heater, there is a phenomenon in which hot water is released at the beginning of the next hot water discharge immediately after the hot water supply is stopped.

To prevent this, it is known to mix cold water afterwards, as shown in, for example, Japanese Utility Model Publication No. 52-2143.

(Problem that the invention aims to solve) However, this device has a temperature sensing element that senses the temperature inside the heat exchanger, a diaphragm that operates when pushed by the temperature sensing element, and a diaphragm that operates in conjunction with the operation of the diaphragm. There are disadvantages such as the need for valves and the like, making the structure complicated.

(Means for solving the problem) The purpose of the present invention is to obtain an instantaneous water heater that is free from such inconveniences. The heat exchanger includes a heat exchanger and a heat source for heating the exchanger, and the heat exchanger is constructed by attaching fins to pipes, and the evaporating part faces into the pipes constituting the heat exchanger, and the condensing part faces into the water pipe. It consists of a heat pipe that faces directly into the room.

(Function) When the instantaneous water heater according to the present invention is used, the main stopcock 8 provided on the water pipe 2 or the first stopcock 9 provided on the hot water outlet pipe 3 is opened to allow water to flow to the heat exchanger 4. Along with the water operation, the heat source 5 is activated, the supplied water is heated by the heat exchanger 4, and hot water at a desired temperature is obtained from the hot water tap 3.

There is no particular difference from conventionally known systems, but once the hot water supply is stopped, the water flow within the heat exchanger 4 is stopped, and a "wake" occurs. That is, the heat held by the heat exchanger 4, which has reached a high temperature first, is absorbed by the water, resulting in an abnormally high temperature.

However, since a heat pipe is interposed between the heat exchanger 4 and the water pipe 2, the heat in the heat exchanger 4 is transferred to the water pipe 2, and the water is partially heated in the heat exchanger 4. You can prevent it from happening.

(Example) An example of implementing the present invention will be explained with reference to the attached drawings.
In the drawing, 1 is a container housing, and 4 is a heat exchanger installed in the upper part of the container casing 1. The heat exchanger 4 has meandering tubes 4a, and a number of fins 4b between these meandering tubes 4a.
The water pipe 2 was connected to one side of the heat exchanger 4, and the hot water outlet pipe 3 was connected to the other side of the heat exchanger 4.

Reference numeral 5 indicates a gas burner as a heat source provided in the lower part of the container housing 1, and 7 indicates a heat pipe interposed between the water supply pipe 2 and the heat exchanger 4. In the illustrated example, a water reservoir is provided in the water supply pipe 2. A section 6 is provided, and an evaporating section 7a at one end faces between the water reservoir section 6 and the most upstream section where the most "backward" occurs in the heat exchanger 4, and a condensing section 7b faces the water reservoir section 6. A heat pipe 7 was inserted as shown in the figure.

The water reservoir 6 is installed at a position where it is not affected by heat from the heat source 5 outside the heat cylinder 12 provided in the housing 1.

In the drawing, 10 is a gas passage 1 connected to the gas burner 5.
The gas valve 10 is opened and closed in conjunction with water flow to the heat exchanger 4.

Incidentally, in the drawing, a indicates a first stopcock provided in the hot water outlet pipe 3, but it goes without saying that a main stopcock 8 may be provided in the water supply pipe 2 instead of this.

(Effect of the invention) As described above, according to the invention, a heat exchanger that connects the water supply pipe and the hot water outlet pipe, and a heat source for heating the heat exchanger are provided in the container, and the heat exchanger has a fin attached to the pipe. This is an extremely simple configuration in which heat pipes are installed so that the evaporating section faces into the pipes that make up the heat exchanger, and the condensing section faces into the water pipes. It can be moved to the water pipe side to easily eliminate the "wax", and in the case of the heat exchanger of this type of instantaneous water heater, the water supply side is generally cooled by the water supply and kept at a low temperature. Drainage occurs because the combustion gas, which has increased humidity due to the water vapor generated by the combustion of the gas, comes into contact with this and is cooled to below the dew point temperature.

However, as described above, when the heat of the heat exchanger is transferred to the water pipe side by the heat pipe, the temperature of the water sent to the heat exchanger rises, which has the effect of suppressing the generation of such drain.

[Brief explanation of the drawing]

In the drawings, FIG. 1 is a cutaway front view of one example of implementing the present invention, and FIG. 2 is an enlarged view of the main parts. 1... Cabinet, 2... Water pipe, 3... Hot water pipe, 4
...Heat exchanger, 5...Heat source.

Claims (1)

[Scope of utility model registration request] A heat exchanger in which a water supply pipe and a hot water outlet pipe are connected to each other and a heat source for heating the heat exchanger are provided in the container housing, and the heat exchanger is constructed by attaching fins to the pipes,
An instantaneous water heater comprising a heat pipe so that an evaporating section faces into the pipes constituting the heat exchanger, and a condensing section faces into the water pipe.