JP2002061955A - Hot water generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water generator which prevents pressure and temperature from rising more than necessary when stopping hot water supply, and suppresses the heat loss, and also is excellent in safety. SOLUTION: This hot water generator is equipped with a high-temperature heat-accumulating vessel 1 equipped with heat-accumulating material 4 wherein an electric heater 2 and the first heat conductive pipe 3 are arranged; hot water manufacturing equipment 10 which is separated into a water part 11 and a steam part 12, with water put in partially inside, and besides whose first pipe line 8 and second pipe line 9 each coupled with the inlet side and outlet side of the above first heat conductive pipe 3 are led to the water part 11 and the steam part 12 respectively, and which is fed with water from one end of the second heat conductive pipe 14 provided within and sends out hot water 15 from the other end; a solenoid valve 16 which is provided in the middle of the first pipe line 8 and besides performs its opening and closing by the detected temperature signal of the hot water 15 from the hot water manufacturing equipment 10; and a release pipe 18 which branches from the first pipe line 8 and leads to the steam part 12 between that solenoid valve 16 and the inlet of the first heat conductive pipe 3 in the hot water manufacturing equipment 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water generator using a high-temperature heat storage tank.

[0002]

2. Description of the Related Art A conventional hot water generating apparatus using a high-temperature heat storage tank has been made to give sufficient consideration to the heat output from the high-temperature heat storage tank when hot water supply is stopped, and to the flow of water and steam in an attached hot water maker. However, there has been a problem that the pressure and temperature are temporarily increased, resulting in a dangerous state and an increase in heat loss.

[0003]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above circumstances, and when the hot water supply is stopped, it is possible to prevent the pressure and the temperature from unnecessarily increasing and to suppress heat loss. It is an object of the present invention to provide a hot water generator excellent in safety.

[0004]

According to one aspect of the present invention, there is provided a high-temperature heat storage tank having a heat storage material in a tank provided with an electric heater and a first heat transfer tube. And a first pipe and a second pipe, each of which is partially divided into a water section and a steam section into which water enters, and which is connected to an inlet side and an outlet side of the first heat transfer tube, respectively. And a hot water production device which supplies water from one end of a second heat transfer tube and supplies hot water from the other end thereof, and a hot water production device provided in the middle of the first conduit. A solenoid valve that opens and closes the valve according to the detected temperature signal of the hot water from the water source, and branches from the first conduit between the solenoid valve and the inlet side of the first heat transfer pipe to communicate with the steam section in the hot water producing device. And a relief tube.

[0005] The set temperature of the solenoid valve (usually 55 ° C to 60 ° C)
When the hot water is lower, the valve is opened to supply water to the inlet side of the first heat transfer tube. When the temperature is higher than the set temperature, the valve is closed and the supply of water to the inlet side of the first heat transfer tube is stopped. Is controlled to be. It should be noted that the power supply period to the electric heater is not particularly limited, but it is preferable to set the power supply period during the night time period (23:00 to 7:00) when the electricity rate is cheap.

[0006] With this configuration, when hot water is required, water is supplied to the second heat transfer tube and the solenoid valve is opened at the same time, so that water from the hot water maker is supplied into the first heat transfer tube.
It is fed through a pipe and heated heat storage material (for example, 50
(At a high temperature of 0 ° C.) to generate steam. The steam is supplied to the steam section of the hot water maker by the second pipe line to heat the water passing through the second heat transfer pipe, and the hot water is removed. generate. When the temperature of the hot water is higher than the set temperature, the solenoid valve is closed, and when the temperature is lower than the set temperature, the solenoid valve is opened to control the supply of steam to the steam section of the hot water generator, thereby setting the temperature of the hot water. It is designed to approach the temperature.

When the hot water supply is stopped, the solenoid valve closes because the detected temperature of the hot water becomes higher than the set temperature, but at this time, the water remaining in the first heat transfer tube has a pressure increased by heating from the heat storage material. When the temperature rises, the temperature and pressure in the first heat transfer tube and the hot water producing device are suppressed to a slight rise, and the heat loss can be minimized. In other words, if there is no relief tube, the water remaining in the first heat transfer tube becomes steam by heating from the heat storage material, and this steam is cooled by cooling in the hot water production device in which the supply of water to the second heat transfer tube is stopped. Liquefaction is not possible, and the temperature inside the first heat transfer tube and the hot water production unit becomes higher than necessary, increasing the pressure, and causing large heat loss with heat dissipation from the hot water production unit that has become hot. become.

[0008] In the hot water generator having the relief pipe as described above, the safety of the apparatus is improved and the heat loss is suppressed. However, if the hot water supply is stopped for a long time, the relief pipe has a small amount of heat. Radiation occurs and cools down, causing water droplets in the tube.
These water droplets are heated in the first heat transfer tube to become steam, and a steam flow is generated inside the device due to a chimney effect.
It causes the pressure and temperature to rise gradually. Therefore, in the invention according to claim 2 of the present invention, by providing a check valve for preventing the flow of water from the hot water producing device to the inlet side of the first heat transfer tube in the middle of the relief tube, the pressure and pressure are reduced. The new danger and heat loss problems associated with increased temperatures have been eliminated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 denotes a high-temperature heat storage tank,
The high-temperature heat storage tank 1 includes an electric heater 2, a first heat transfer tube 3, a heat storage material 4, an outer casing 5, an inner casing 6, and a heat insulating material 7. In this inner casing 6,
The electric heater 2 and the first heat transfer tube 3 are arranged, and the heat storage material 4 is charged. A first conduit 8 is provided at the inlet side of the first heat transfer tube 3.
However, a second pipe 9 is connected to the outlet side of the first heat transfer pipe 3, and the first pipe 8 and the second pipe 9 communicate with the hot water producing device 10.

The hot water producing device 10 is divided into a water portion 11 and a steam portion 12 by containing water in a part of the inside, and the first pipe 8 and the steam portion 1 are provided in the water portion 11.
The second pipes 9 communicate with each other. Further, a second heat transfer tube 14 to which tap water 13 is supplied from one end side is arranged in the hot water producing device 10.

Between the high-temperature heat storage tank 1 and the hot-water producing device 10 configured as described above, the water W supplied from the water section 11 through the first pipe 8 is heated while flowing through the first heat transfer tube 3. Heated in the heat storage tank 1, the steam S from the outlet side of the first heat transfer tube 3
The steam S is sent to the steam section 12 in the hot water producing device 10 through the second pipe 9, and the steam S heats the tap water 13 supplied from one end of the second heat transfer pipe 14 to form the second heat transfer pipe 14. The steam S is cooled and liquefied at the same time as the hot water 15 is generated from the other end of the steam generator, and a circulation path is formed in which the steam S is returned to the water section 11 as water W.

In order to keep the temperature of the hot water 15 generated from the hot water producing device 10 at a set temperature (usually 55 ° C. to 60 ° C.), an electromagnetic valve 16 is interposed in the middle of the first pipe 8 and the electromagnetic valve 1
6 is a temperature controller 17 for detecting the temperature of the hot water 15 and comparing the detected temperature with a set temperature to generate a control signal.
The valve is configured to open and close the valve.

A relief pipe 18 branched from the first conduit 8 is provided between the solenoid valve 16 and the inlet side of the first heat transfer pipe 3 so as to communicate with the steam section 12 of the hot water producing device, and the hot water supply is stopped. Sometimes, when the electromagnetic valve 16 is closed, the water remaining in the first heat transfer tube 3 is returned to the hot water maker 10 through the relief tube 18, and the temperature inside the first heat transfer tube 3 and the hot water maker 10 is reduced. And pressure were kept to a slight increase, and heat loss was minimized.

Next, an embodiment of the hot water generator of the present invention will be described. The specifications of the heat storage tank 1 used here are as follows: electric heater capacity: 4.5 Kw Heat storage material: 450 kg of magnesia, 62 K of nitrate
g Heat storage amount: 45 Kwh Heat output: 1 Kw 1st heat transfer tube: Stainless steel tube (15.0 mm in outer diameter,
The thickness is 1 mm and the length is 30 m).

The results of implementing the present invention according to the above specifications are as follows:
As shown in FIG. 2, the temperature of the temperature controller 17 could be suppressed to about 80 ° C. by taking measures for the relief pipe 18, and the pressure was 0.1 MPa. Incidentally, in the case where no countermeasures were taken, the temperature of the temperature controller 17 rose to 150 ° C., and the pressure became 0.5 MPa.

FIG. 3 shows a second embodiment of the present invention. The difference from the first embodiment (see FIG. 1) is that the hot water producing device 10 1 is that a check valve 19 for preventing the flow of water to the inlet side of the heat transfer tube 3 is provided. Thus, the check valve 19 is provided and the relief pipe 1 is provided.
The flow in 8 is limited to the flow from the inlet side of the first heat transfer tube 3 to the hot water producing device 10 and the flow in the reverse direction is prevented because the hot water supply stopped state is maintained for a long time. The temperature of the relief pipe 18 becomes low due to heat dissipation, and the relief pipe 1
This is to prevent the flow of steam generated due to the flow of water to the first heat transfer tube 3 due to water droplets generated in the tube 8.

[0017]

According to the first aspect of the present invention, a relief pipe for returning the water remaining in the first heat transfer pipe to the hot water producing device is provided in the apparatus so that the hot water supply can be stopped. In the first heat transfer tube and the hot water production device, it is possible to prevent unnecessarily rise in temperature and pressure, and also to suppress heat loss,
It is possible to provide a device that can contribute to safety.

According to the second aspect of the present invention, a check valve for preventing flow of water from the hot water producing device to the inlet side of the first heat transfer pipe is provided in the middle of the relief pipe.
Even when the hot water supply stop time continues for a long time, it is possible to prevent a new rise in temperature and pressure and eliminate heat loss, and to provide a device with higher safety.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing a first embodiment of the present invention.

FIG. 2 is a graph showing implementation data of the present invention.

FIG. 3 is a schematic explanatory view showing a second embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 high-temperature heat storage tank 2 electric heater 3 first heat transfer tube 4 heat storage material 8 first pipe 9 second pipe 10 hot water generator 11 water section 12 steam section 14 second heat transfer pipe 15 hot water 16 solenoid valve 18 relief pipe 19 reverse Stop valve

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masakatsu Sakai 15-1, Ushijima-cho, Toyama City, Toyama Prefecture Hokuriku Electric Power Company (72) Inventor Katsuya Hirita 15-1, Ushijima-cho, Toyama City, Toyama Prefecture Hokuriku Electric Power Company In the formula company

Claims (2)

[Claims] 1. An electric heater (2) and a first heat transfer tube (3).
A high-temperature heat storage tank (1) including a heat storage material (4) in a tank in which water is disposed, and a water part (11) and a steam part (12) in which water partially enters.
And a first pipe (8) and a second pipe (9) connected to an inlet side and an outlet side of the first heat transfer pipe (3), respectively, are the water section (11) and the steam section. A hot water producing device (10) that communicates with the second heat transfer tube (12) and supplies water from one end of the second heat transfer tube (14) and supplies hot water (15) from the other end; 8) and a hot water production device (1)
A solenoid valve (16) for opening and closing the valve according to the detected temperature signal of the hot water (15) from the above (0), and a first conduit between the solenoid valve (16) and the inlet side of the first heat transfer pipe (3). And a relief pipe (18) that branches off from (8) and communicates with the steam section (12) in the hot water producing device (10). 2. A check valve (19) for preventing flow of water from the hot water producing device (10) to the inlet side of the first heat transfer pipe (3) is provided in the middle of the relief pipe (18). The hot water generator according to claim 1, wherein: