JP2000028201A - Heat exchanging device and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge contact area with water so as to reduce ununiformity of temperature, dispense with a complicated seal structure, and decrease manufacturing processes, by embedding a plane heater which serves as a heat source in an inner wall of a tank. SOLUTION: In forming a tank for a heat exchanging device a plane heater 10 is stuck, first of all, to a metal mold 21 for blow molding. Subsequently, a resin 20, which takes shape of a balloon being inflated with air, and which serves as an inner wall of the tank, is supplied to the inside of the metal mold 21 from a nozzle 19, followed by blowing air thereinto to closely adhere the resin 20 to the inside of the metal mold 21. Thus, the resin 20 and the plane heater 10 are integrated, and thereafter, an outer wall is formed. In this way, a contact area between a heating portion and water can be enlarged, and thus water inside the tank can be entirely heated, and further, by making large the capacity of the heater 10 the temperature rising speed can be accelerated. Further, by permitting the plane heater 10 to have a shape of a thin leaf having flexibility, the resin permeates into the heater, thereby ensuring an excellent adhesion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for heating water and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as means for warming water, it is common to generate heat using energy such as electricity, kerosene, gas or the like, and transfer the heat to the water by a heat exchange device. Since kerosene and gas have low running costs, they are widely used as heat sources for water heaters, bath kettles, and the like. However, since these heat sources burn fuel to obtain heat, there is a problem of ventilation, and it is difficult to install them indoors. In addition, there is a risk of fire due to the emission of flames, especially explosion when gas leaks, and it is not a safe heat source.

On the other hand, since electric energy does not generate heat by burning, it solves the above-mentioned safety problems of kerosene and gas. There is no difference in running cost compared to gas or kerosene due to the use of nighttime power or solar power generation. for that reason,
Demand for water heaters to supply hot water to the entire water area in the home, water heaters dedicated to washrooms, and heat exchangers for hot water flush toilet seats is increasing, and from the perspective of preventing global warming,
It has been reviewed.

As a heat source of a heat exchanger of an electric water heater, a sheathed heater is generally used because it is inexpensive and highly reliable. As shown in FIG. 6 (a), the sheath heater 22 is submerged in the tank, and the water in contact with the sheath heater is heated to generate convection, thereby finally heating the entire structure uniformly. Has become.

[0005]

However, in the heat exchanger using the above-described sheathed heater, the surface area of the sheathed heater 22 itself is small as shown in FIG. The heat conduction efficiency was poor. As a result, in order to increase the speed of raising the temperature of the water, it is necessary to increase the surface temperature of the heater, so that a considerable temperature difference occurs between the water near the heater and the water around the heater. The temperature was uneven. If temperature unevenness occurs in the heat exchanger, when hot water is discharged,
The temperature of the hot water changes, and for applications where the human body comes into contact, such as showers and hot water flush toilet seats, the result is that the person feels discomfort. Further, when trying to increase the heating rate, water near the heater is boiled and an abnormal noise is generated, so that there is a limit in increasing the heating rate.

Further, since a considerable water pressure is applied to the heat exchange tank, it is necessary to have a structure which can be strictly sealed so as not to leak water when the sheathed heater is incorporated in the heat exchange tank in the manufacturing process. Was. As a result, the number of assembling steps is increased, and the possibility of water leakage is always present.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat exchanging apparatus which has a small temperature change, a high temperature rising rate, and can eliminate a manufacturing process.

[0008]

Means for Solving the Problems and Functions / Effects The invention according to claim 1 made to solve the above problems has a heat source using electricity as an energy source, and the heat source exchanges heat with water. In the heat exchange apparatus having a tank for performing heat treatment, a planar heating heater is embedded as a heat source in the inner wall of the tank of the heat exchange apparatus.

In the present invention, in order to increase the contact area between the heat source of the heat exchanger and the water in the heat exchanger tank, a planar heater having a large area is embedded in the inner wall of the heat exchanger. As a result, the water in the tank can be heated as a whole, so that the unevenness in the temperature of the hot water in the tank can be reduced, and even if the heat capacity of the heater is increased, it is difficult for the heater to boil. be able to. Further, since it is buried in the wall surface of the tank, there is no need for sealing, and the production process can be simplified.

According to a second aspect of the present invention, the heat source is a thin-sheet heater having flexibility.

In the present invention, the shape of the heat source can be freely changed by using a flexible thin-sheet heater as the heat source. It is now compatible with heat exchangers with different shapes. Moreover, since it is a thin leaf, it has good adhesion to the resin and can maintain strength.

According to a third aspect of the present invention, in the method of manufacturing a heat exchange device, when forming the tank of the heat exchange device, first, a flexible thin leaf heater is attached to a mold, and In this state, the resin layer serving as the inner wall of the tank is blow-molded to be integrated with the flexible thin-leaf heater, and thereafter the outer wall is formed.

In the present invention, in order to efficiently manufacture the heat source when burying the heat source in the inner wall of the tank, first, when forming the resin layer serving as the inner wall, blow molding is performed integrally with the heater. Later, the outer wall is formed. As a result, in the conventional manufacturing method in which the heater is incorporated after the formation of the tank, a step of sealing the location where the heater is incorporated and a step of specifying the position of the heater are required, but such steps can be omitted. In addition, the manufacturing process can be simplified.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an example of a heat exchange device for producing hot water of a hot water flush toilet seat, 1 is a heat exchange device, 2 is a planar heating heater, 3 is a heat exchange device tank inner wall, 4 is a heat exchange device tank outer wall, Reference numeral 5 denotes a water supply hose, 6 denotes a hot water supply hose to a cleaning nozzle (not shown), 7 denotes a temperature sensor, and 8 denotes a controller.

First, hot water is stored in the heat exchange device 1 and is kept at a set temperature. When the hot water cleaning function is activated, hot water flows from the hot water supply hose 6 to the cleaning nozzle, and the corresponding amount of water is supplied from the water supply hose 5 into the heat exchange device 1, the water temperature in the heat exchange device 1 decreases, and the temperature sensor The temperature detected by 7 is transmitted to the controller 8, and if the detected temperature is lower than the set temperature, the planar heating heater 2 is turned on to heat the water. When the hot water temperature reaches the set temperature by heating, the planar heating heater 2 is turned off. By this repetition, control is performed so as to maintain the set temperature.

In this heat exchange device, the contact area between the heat generating portion and water can be increased as compared with the conventional heat exchange device.
The water in the tank can be heated as a whole, the unevenness in the temperature of the hot water in the tank can be reduced, and even if the heat capacity of the heater is increased, it is difficult for the heater to boil. Speed can be increased. Furthermore, since the heater is embedded in the inner wall of the tank, there is no need to insert the heater from the outside, so there is no need to take a strict sealing structure required when the heater is inserted from the outside, and the assembly process can be simplified.

[0017]

[Embodiment 1] FIG. 2 is a diagram showing the appearance of an electric water heater, and FIG. 3 is a diagram showing a cross section thereof. In the figure, 9 is an electric heater, 10 is a sheet heating heater, 11 is an electrode, 12 is a controller for controlling the temperature, 13 is a lead wire connecting the electrode and the controller, 14 is a power cord, and 15 is an electric heater. The inner wall of the tank, 16 is the outer wall of the tank of the electric warmer, 17
Is a temperature sensor, and 18 is sake. Planar heating heater 13
Is a flexible thin leaf heater, for example,
A heater, such as a paper made of carbon fiber in the form of Japanese paper, is very thin and can be freely deformed, and can absorb the bending due to expansion and contraction of the fiber when bent.

The temperature of the liquor is detected by the temperature sensor 17. If the temperature of the liquor is lower than the temperature set in the controller 12, the energization ON incorporated in the controller 12 is turned on.
The / OFF circuit is turned on, and electricity is supplied to the sheet heater 10 through the electrode 11. When the planar heating heater 10 generates heat by energization, the heat is transmitted to the sake 18 and the temperature rises. When the temperature rises, the temperature sensor 17 detects the temperature, and when the temperature reaches the set temperature, the power is turned off and the heat generation of the sheet heating heater 10 is stopped, so that the temperature of the sake is kept at the set temperature.

With this structure, the contact area between the heat generating portion and the liquor can be increased as compared with the conventional warming device, so that the liquor in the tank can be entirely heated and the heat capacity of the heater can be increased. However, it is difficult to boil, so that the capacity of the heater can be increased, so that the heating rate can be increased. In addition, it is possible to prevent the taste of sake from dropping due to boiling.

Next, the manufacturing method will be described. FIG.
Is a view showing a manufacturing process of the heat exchange device, 19 is a blow-molding resin supply nozzle, 20 is a resin for the tank inner wall, and shows a state in which air has entered the inside of the molten resin, and FIG.
1 is a mold for blow molding.

First, the sheet heater 10 is attached to the blow molding die 21 in advance. Next, the resin 20 to be the tank inner wall of the warming device is supplied into the mold 21 in a state of being blown into the balloon from the nozzle 19 to form a balloon.
By further blowing air, the resin is brought into close contact with the mold 21 as shown in FIG.

When the resin adhered to the mold 21 is cooled and solidified by radiating heat to the mold 21, the resin is integrated with the sheet heating heater 10 previously attached to the mold 21. If the sheet heater 10 is a thin leaf heater having flexibility, the resin penetrates into the heater, and the adhesion between the resin and the heater is extremely improved.

The tank outer wall 8 of the warmer can be wrapped with an insulating film or molded with resin by two-color molding.

[0024]

According to the present invention, the area of contact with water can be increased by embedding a planar heating heater, which is a heat source of the heat exchanger, in the inner wall of the tank, so that the temperature unevenness can be reduced. The problem of boiling noise can be eliminated.
Further, since the heat source is buried in the heat exchange device, there is no need to adopt a complicated sealing structure as in the prior art, so that the number of manufacturing steps can be reduced and there is no fear of water leakage.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a heat exchange device for a hot water flush toilet seat as an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a configuration of an electric warmer.

FIG. 3 is a schematic diagram showing a cross section of FIG. 2;

FIG. 4 is a schematic view showing an initial step of blow molding.

FIG. 5 is a schematic view showing a final step of blow molding.

FIG. 6 is a schematic view showing a configuration of a conventional heat exchange device for a hot water flush toilet seat.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 heat exchange device 2 planar heater 3 tank inner wall 4 tank outer wall 5 water supply hose 6 hot water supply hose 7 temperature sensor 8 controller 9 electric heater 10 ... sheet heating heater, 11 ... electrode, 12 ... controller, 13 ... lead wire, 14 ... power cord, 15 ...
Tank inner wall, 16 ... Tank outer wall, 17 ... Temperature sensor, 1
8 ... sake, 19 ... blow molding resin supply nozzle, 20 ... tank inner wall resin, 21 ... blow molding die

Claims (3)

[Claims] 1. A heat exchange device having a heat source using electricity as an energy source, the heat source having a tank for exchanging heat with water, wherein a planar heating heater is buried in a tank inner wall of the heat exchange device as a heat source. A heat exchange device characterized in that: 2. The heat exchange device according to claim 1, wherein the heat source is a flexible thin-sheet heater. 3. When forming a tank of a heat exchange device,
First, a flexible thin leaf heater is attached to the mold,
In this state, a method for manufacturing a heat exchange device, comprising: blowing a resin layer serving as an inner wall of the tank into a unit with the flexible thin leaf heater, and thereafter forming an outer wall.