JPH116651A - Water flow heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of heat by a method wherein a metallic heat transfer pipe through which flow water flows is embedded in a metallic heating medium block heated by a ceramic heater, a plate form ceramic heater is pressed against the heater mounting surface of the metallic heating medium block through an elastic heat insulation material by a caul for mounting. SOLUTION: A metallic heat transfer pipe 8 is made of a metal, such as stainless or copper, being durable against corrosion and simultaneously having high thermal conductivity, and has length enough to provide a heat transfer area sufficiently necessary for heating. A metallic heating medium block 9 is formed of a metal being excellent in thermal conductivity, such as aluminum, and simultaneously, also excellent in workability. The metallic heat transfer pipe 8 is embedded and molded by die cast and a heater mounting surface 10 is formed. A plate form ceramic heater 11 is mounted in an adhesion to a heater mounting plane 10 of a metallic heating medium block 9 to heat the metallic heating medium block 9. Flow water flowing through the metallic heat transfer pipe 8 embedded in the metallic heating medium block 9 is heated. An elastic heat insulation material 13 prevents dissipation of heat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device, and more particularly to a flowing water heating device provided in a flowing water circuit for indirectly heating flowing water with an electric heater.

[0002]

2. Description of the Related Art Conventionally, in a water treatment device such as a bathtub hot water purifier, a running water heating device for heating running water to a predetermined temperature in a circulation path is provided. The one using an electric heater as a heat source has been widely used because the device is small and can be easily manufactured.

[0003] The running water heater using the electric heater as a heat source includes a direct heating type in which an electric heater such as a quartz tube heater and a sheath heater is disposed in a circulation path of the flowing water and directly heats the flowing water, and a heating method using the electric heater. There is an indirect heating type in which flowing water is heated via a heated heat medium.

[0004] The direct heating type can make the apparatus simple and has good thermal efficiency, but when the quartz tube of the quartz tube heater is broken or the metal tube filled with the insulating material of the sheathed heater is corroded, the hole becomes clear and the insulation is broken. In such a case, there is a danger of leakage to running water.

For this reason, even when a sheathed heater is used, a double sheathed heater having double insulation against a heating wire is provided.
Further, a safety measure is required to provide an insulation deterioration detecting device for the insulating layer so that it is possible to detect that the insulation has deteriorated due to a hole in the metal tube, and the device becomes expensive.

On the other hand, as an indirect heating device, an oil heater for heating oil as a heat medium with an electric heater has been widely used, but this device has a complicated structure, is expensive, and has poor thermal efficiency.

For this reason, recently, a metal heat transfer tube through which flowing water flows is attached to a metal heat medium fitting having good thermal conductivity such as an aluminum alloy, and the heat medium fitting is heated by a ceramic heater, and the heat transfer pipe in the heat transfer pipe is removed. Indirect heating devices that transfer heat to flowing water have been widely used because they have high thermal efficiency and are safe with almost no risk of electric leakage.

As such an indirect heating device for flowing water, one metal heat transfer tube through which flowing water flows is attached to a mounting bracket,
Japanese Patent Application Laid-Open Nos. Hei 5-302754 and Hei 6-2940 disclose an apparatus having a configuration in which a plate-shaped ceramic heater is mounted on a heater mounting surface of the mounting bracket, and the path of two metal heat transfer tubes through which flowing water flows. An apparatus having a configuration in which a plate-shaped ceramic heater is sandwiched between mounting members through a mounting bracket is disclosed in
-117687.

FIG. 5 shows an example of an apparatus having a configuration in which a plate-shaped ceramic heater is sandwiched between mounting paths of two metal heat transfer tubes through which flowing water flows, as shown in FIG.
Is a torsion and return metal heat transfer tube made of a metal having excellent heat conductivity and corrosion resistance, such as stainless steel and copper. The torsion and return metal heat transfer tubes 1 and 2 are made of a heat transfer material such as an aluminum alloy. It is buried in a rectangular bracing and returning metal heat medium block 3 or 4 as a mounting bracket made of excellent metal with both ends protruding.

Reference numeral 5 denotes a plate-shaped ceramic heater for heating the matte and return metal heat medium blocks 3 and 4.
A plate-like ceramic heater 5 is sandwiched between the heater mounting planes of the forward and return metal heat medium blocks 3 and 4, and the forward and return metal heat medium blocks 3 and 4 with the ceramic heater 5 interposed therebetween. Stainless steel leaf springs 6 are fitted into projections provided on both left and right ends on both front and back sides to be combined and integrated.

When the ends of the heat transfer tubes 1 and 2 are connected by a U-shaped connection tube 7, the flowing water flows through the heat transfer tube 1 and returns as shown by the arrow. And heated during this circulation by a ceramic heater 5 via a metal heating medium block 3 and 4.

[0012]

However, in the above-described apparatus, two metal heat transfer tubes through which flowing water flows are mounted on a mounting bracket, and a plate-shaped ceramic heater is mounted on a heater mounting surface of the mounting bracket. Then, the plate-shaped ceramic heater heats the mounting bracket only from the side of the mounting bracket that is in contact with the heater mounting surface, and a large amount of heat is dissipated from the surface that is not in contact with the heater mounting surface. The problem was that the heat efficiency was poor.

[0013] Also, as shown in FIG.
In an apparatus having a configuration in which a plate-shaped ceramic heater is sandwiched between metal paths of a metal heat transfer tube via a metal heat medium block as a mounting bracket, the size of the apparatus becomes large, the manufacturing cost increases, and The problem was that it took time and effort.

That is, the forward and return metal heat medium blocks 3 and 4 in which the metal heat transfer tubes 1 or 2 are embedded must be made separately by aluminum alloy die casting with the metal heat transfer tubes 1 or 2 inserted. .

As described above, it takes time and effort to separately manufacture the two metal heat medium blocks 3 and 4, and also, a plate-shaped ceramic is interposed between the two metal heat medium blocks 3 and 4 separately manufactured. Since the heaters 5 are connected while using a plurality of leaf springs 6 with the heater 5 interposed therebetween, the manufacturing cost is increased.

Further, the size of the apparatus is large because the apparatus cannot be made linear as in the case of using a single metal heat transfer tube. At the same time, the pipes for the forward and return metal heat transfer pipes 1 and 2 also need the pipes of the connecting pipe 7, and the pipes become complicated. .

[0017]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention embeds a metal heat transfer tube through which flowing water flows into a metal heat medium block heated by a ceramic heater, A plate-shaped ceramic heater is attached to the heater mounting plane of the media block by pressing it with a backing plate via an elastic heat insulating material, and is made straight using only one metal heat transfer tube through which flowing water flows. The running water heating device was configured so as not to be complicated, and at the same time, to prevent heat from being dissipated from the non-mounting surface side of the ceramic heater to the metal heating medium block with a heat insulating material to improve the thermal efficiency.

Further, a contact plate for pressing the plate-shaped ceramic heater against the heater mounting plane of the metal heat medium block via the elastic heat insulating material is provided by sealing the plate-shaped ceramic heater against the heater mounting plane of the metal heat medium block. The pressing lid is a pressing lid for pressing down, so that heat can be more completely prevented from dissipating from the non-contact surface side of the metal heating medium block of the plate-shaped ceramic heater with respect to the heater mounting plane.

[0019]

FIG. 1 is a sectional side view, FIG. 2 is a partially enlarged view of a portion A in FIG. 1, FIG. 3 is a plan view, FIG. Is shown as a front view.

Reference numeral 8 denotes a metal heat transfer tube through which flowing water flows. The metal heat transfer tube 8 is made of a metal which is resistant to corrosion, such as stainless steel or copper, and has good heat conductivity, and is sufficient for heating. The length is such that a heat transfer area can be obtained.

Reference numeral 9 denotes a metal heat medium block. The metal heat medium block 9 is made of a metal such as aluminum having excellent heat conductivity and excellent workability. A heater mounting plane 10 is formed by casting.

Reference numeral 11 denotes a plate-shaped ceramic heater, which is attached in close contact with the heater mounting plane 10 of the metal heat medium block 9 to heat the metal heat medium block 9, and heats the metal heat transfer tube 8 embedded in the metal heat medium block 9. Heats the flowing water flowing through.

Numeral 13 denotes an elastic heat insulating material, which is made of a heat-resistant elastic material such as glass wool.
The non-contact surface 12 with the plate-shaped ceramic heater 1
When the metal heat medium block 9 is heated in step 1, heat is prevented from dissipating from the non-contact surface 12 side with respect to the heater mounting plane 10.

Reference numeral 14 denotes a holding lid, and this holding lid 14
Functions as a backing plate for pressing the plate-shaped ceramic heater 11 onto the heater mounting plane 10 of the metal heating medium block 9 via the elastic heat insulating material 13, and the plate-shaped ceramic heater 11 functions as a heater mounting plane 10 of the metal heating medium block 9. It is a lid made of metal such as aluminum that is sealed and pressed down.

Reference numeral 15 denotes an attachment spring for attaching the holding lid 14 to the metal heating medium block 9. Therefore, in order to attach the plate-shaped ceramic heater 11 to the metal heating medium block 9, the heater mounting plane 10 of the metal heating medium block 9 is used. First, the plate-shaped ceramic heater 11 is placed thereon, then the elastic heat insulating material 13 is placed on the plate-shaped ceramic heater 11, and then the holding cover 14 is put thereon. Finally, the metal heat medium block 9 and the holding cover 14 are attached to the mounting holes. And is fixed by the mounting spring 15 inserted in.

Then, the plate-shaped ceramic heater 11 is placed on the heater mounting plane 10 of the metal heat medium block 9 on the holding lid 1.
At 4, it is pressed down via the elastic heat insulating material 13 and can be easily attached in a sealed state.

As a result, the plate-shaped ceramic heater 11 is substantially prevented from dissipating heat from the non-contact surface 12 to the heater mounting plane 10 of the metal heating medium block 9, and the slightly dissipated heat is also provided below the holding lid 14. Since the heat is transmitted to the metal heat medium block 9 in contact from the end face, the metal heat medium block 9 can be heated very efficiently.

Also, since only one metal heat transfer tube 8 is provided, only one metal heat medium block needs to be formed, and the apparatus is straight, so that the manufacturing cost is low and the size is small. Since the piping does not require the piping for connecting the metal heat transfer tubes, the piping can be made simple and easy without any trouble.

[0029]

According to the present invention, there is provided an indirect heating device for flowing water using an electric heater as a heat source, which is configured as described above, has good thermal efficiency, and is small and inexpensive to manufacture.

When such a heating device is applied to, for example, a bathtub cleaning device, the bathwater circulating in the cleaning pipe is efficiently heated to an appropriate temperature in a safe state without danger of electric leakage.
You can enjoy bathing comfortably at any time for 4 hours.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an embodiment;

FIG. 2 is a partially enlarged side sectional view of the embodiment;

FIG. 3 is a plan view of an embodiment,

FIG. 4 is a front view of the embodiment;

FIG. 5 is a plan view of a conventional example.

[Explanation of symbols]

 Reference Signs List 8 metal heat transfer tube 9 metal heat medium block 11 plate-shaped ceramic heater 13 elastic heat insulating material 14 holding lid

Claims (2)

[Claims] 1. A heating device provided in a circulation path of flowing water for indirectly heating the flowing water with an electric heater, wherein a metal heat transfer tube through which the flowing water flows is embedded in a metal heating medium block heated by a plate-shaped ceramic heater. A flowing water heating apparatus, wherein a plate-shaped ceramic heater is mounted on a heater mounting plane of the metal heat medium block by pressing with a backing plate via an elastic heat insulating material. 2. A plate for pressing a plate-shaped ceramic heater against a heater mounting plane of a metal heating medium block through an elastic heat insulating material, sealing the plate-shaped ceramic heater against the heater mounting plane of the metal heating medium block. The running water heating device according to claim 1, wherein the running water heating device is a holding lid for holding down.