JP2003056915A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing cost and the parts cost in a heater and a fuse assembled in a heat exchanger while securing respective operations of the fuse and heater and reducing any mistake upon manufacture by uniting both the heater and fuse. SOLUTION: A sheet body is formed by holding a linear electric heater and a linear fuse with a sheet, and the sheet body is mounted on a heat exchanger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater, and more particularly to devices for preventing overheating and freezing of a water heater. Further, the water heater in the present invention includes not only a heat source device for hot water supply but also a heat source device for reheating the bath and for hot water heating.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, a heat exchanger 2 of a water heater is used when an abnormality occurs in the heat exchanger 2, for example, when an outflow of exhaust gas is detected due to damage of the heat exchanger 2. A fuse 12 is attached as a safety device. In addition, the heat exchanger 2 is provided with electric heaters 11 which are operated by a freeze prevention circuit at several places to prevent freezing in winter, and the electric heaters 11 are energized and heated when the outside air temperature falls to prevent freezing. is doing. Then, the fuse 12 and the electric heater 1
1 is a separate heat exchanger 2 metal fittings 4 (fuse fasteners etc.)
Was installed by.

Further, due to the recent development of technology, the heat exchanger 2 of this type has been miniaturized, so that some fuses are used in order to prevent assembly mistakes during manufacturing and to prevent contact due to deformation. Since the position is finely regulated by the fuse guide 5 and the like, workability is lowered and unnecessary cost is increased.

Further, the fixing by the metal fittings is caused by a mistake in manufacturing, a deformation / positional deviation of the metal fittings due to vibration during transportation, a mistake in reassembly during repair, etc.
When the electric heater 1 is apt to come into contact with or come close to the electric heater 11, and the electric heater 11 is energized in that state, the fuse 12 generates heat even though the heat exchanger 2 is not in an abnormal situation such as damage. There is a problem that the hot water heater cannot be used because of the disconnection and safe operation.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned technical problems, and its purpose is to eliminate the need for position regulation by fixing metal fittings and to prevent freezing. Even if the electric heater is energized for operation, it is possible to inexpensively prevent the fuse from breaking, and to provide a structure that reliably detects an abnormality when the heat exchanger is damaged.

[0006]

In order to solve the above problems, according to the present invention, a linear electric heater that generates heat when energized and a linear fuse that is conductive and blows at a preset temperature are provided. The first feature is a water heater in which a seat body is formed by holding the seat body and the seat body is attached to a heat exchanger.

In addition, a heat-conducting non-combustible layer is formed on one or both sides of the seat body, and the non-combustible layer is directed toward the heat exchanger side of the seat body, and the water heater attached to the heat exchanger is attached to the second water heater. Characterize.

A third feature of the water heater according to claim 1 or 2 is that a heat insulating layer is formed on the other side of the seat body, and the seat body is attached to the heat exchanger with the heat insulating layer facing outward. And

A fourth aspect of the present invention is the water heater according to claim 1, 2 or 3, wherein the electric heater of the seat body is incorporated in a freeze prevention circuit, and the fuse of the seat body is incorporated in a combustion control circuit. .

According to the above-mentioned first feature, the linear electric heater and the linear fuse have arbitrary shapes on the flexible sheet so that they are not in contact with each other (especially the heat of the linear electric heater is linear. If the heat is transferred to the fuse part of the fuse and the fuse does not blow, and if it is held with a heat-resistant adhesive, etc., the fuse and the electric heater can perform the specified functions by attaching the seat body to the heat exchanger. At the same time, it is possible to prevent the fuse from coming into contact with or close to the electric heater. or,
The seat body can be easily attached to the water heater with a heat-resistant adhesive, a band, or the like, and can be easily removed during repairs.

According to the above-mentioned second feature, a non-combustible layer having excellent heat conductivity such as a thin plate of aluminum foil or a vapor-deposited metal film is formed on at least one side of the sheet body, which is the mounting surface side of the heat exchanger. Therefore, the heat due to the outflow of exhaust gas due to the damage of the heat exchanger can be transferred to the fuse by the non-combustible layer, and the abnormality can be reliably detected even with a smaller number of linear fuses as compared with the conventional one.

According to the third feature, since the heat insulating layer made of glass wool or the like having excellent heat retaining property is formed on the outer side of the seat body, the heat retaining property of the heat exchanger is improved and it is used in the conventional water heater. The capacity of the heater can be made smaller than that of the electric heater of the freeze prevention device described above, the rise time at the time of re-hot water can be shortened, and the rise of the exterior surface temperature of the water heater can be prevented.

According to the fourth feature, the fuse of the seat body and the electric heater attached to the heat exchanger are incorporated in the combustion control circuit and the freeze prevention circuit of the water heater to reliably detect an abnormality in the water heater, Freezing can be prevented.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a one-can, two-circuit type heat exchanger showing an embodiment of the device of the present invention, and 1 is a linear electric heater 11 and a linear fuse 12.
2 is a heat exchanger, 3 is a sheet body holding
Is a body pipe of the heat exchanger 2. Linear electric heater 11
The linear fuse 12 and the linear fuse 12 are each made to have an insulating property by an insulating coating. Further, regarding the linear fuse 12, a plurality of elements having a fusible function are connected in series, or the entire fuse is allowed to have a full length. It may have a melting function.
The electric heater 11 has a heater wire covered with an insulating material such as flexible heat-resistant silicone rubber. A one-can, two-circuit heat exchanger has, for example, separate circuits for hot water and bath in one heat exchanger, and there is a water supply pipe on the hot water inlet side of the heat exchanger and a hot water supply pipe on the hot water outlet side. Are connected to each other, and the hot water supply pipe is led to a hot water tap in a kitchen or the like. In the heat exchanger, when the hot water tap is opened, the water introduced from the water supply source through the water supply pipe is heated in the heat absorption pipe with fins that is separate from the bath by using the combustion heat of the burner. Is supplied with hot water through a hot water supply pipe and a hot water tap. Further, a heating pipe from the bath is connected to the bath entrance side of the heat exchanger, and a heating pipe to the bath is connected to the bath exit side. When the bath heating switch is pressed with a remote control, the heat exchanger uses the pump to heat the bath water through the heating pipe, and uses the combustion heat of the burner to supply hot water with a finned endothermic pipe. It is heated, and this heated water is returned to the bath through the reheating pipe. A trunk pipe is a pipe wound around the heat exchanger to preheat water before it enters the finned endothermic tube of the heat exchanger.

In FIG. 2, an electric heater 11 and a fuse 12 are bent and held in the seat body 1 so that the electric heater 11 and the fuse 12 are kept at a constant distance a as shown in the drawing.

The one shown in FIG. 3 is a linear electric heater 1.
The sheet main body 1 is configured by embedding 1 and the linear fuse 12 in a non-combustible layer having excellent heat conductivity with a predetermined space a. As a manufacturing method, a frame having an opening on the upper surface is provided, and a spacer or the like is placed at a key portion so that a specified dimension is floated from the bottom surface in the frame, and the electric heater 11 and the fuse 12 are provided.
Are arranged while being bent using a jig or the like so that a constant distance a is maintained. After that, the frame 10 is filled with a base material 10 such as a non-combustible fluorine-based inert substance or a carbon-based substance having excellent heat transfer property, or a polymer-based substance having excellent heat transfer property,
The base material 10 in the frame, the electric heater 11 and the fuse 12 are integrated to form the seat body 1. The frame is removed after filling the base material 10. In such a configuration, the noncombustible layer 13 is formed by using a material having excellent heat conductivity for the base material 10. However, as shown in FIG. 4 described later, the noncombustible layer 13 such as an aluminum foil is further formed. You may do it. A heat insulating layer 14 is formed by applying an adhesive to a heat insulating material such as glass wool and adhering it to the sheet body 1. The sheet body 1 is attached to the heat exchanger 2 so that the surface of the base material faces the heat exchanger 2.

In the structure shown in FIG. 4, an adhesive is applied to the surface of the sheet body 1 shown in FIG. 3 on the side opposite to the heat insulating layer 14 and to a non-combustible material having excellent heat conductivity such as a thin aluminum foil plate or a vapor-deposited metal film. The incombustible layer 13 is formed by coating and adhering, and the incombustible layer 13 is attached so that the surface thereof faces the heat exchanger 2. In this case, the heat transfer characteristics of the base material 10 are shown in FIG.
It is possible to use a material having a characteristic lower than that used in.

FIG. 5 shows a linear electric heater 11.
The sheet body 1 in which the non-combustible layer 13 is formed by applying an adhesive to the non-combustible material having excellent heat conductivity such as a thin aluminum foil plate or a vapor-deposited metal film, It is composed.

FIG. 6 shows a linear electric heater 11.
The linear fuse 12 and the linear fuse 12 are applied to an incombustible material having excellent heat conductivity such as a thin plate of aluminum foil or a vapor-deposited metal film, and sandwiched and adhered with a heat insulating material such as glass wool, and the incombustible layer 13 is provided on one side. Is a sheet main body 1 on which the heat insulating layer 14 is formed on the other side.
Is attached to the heat exchanger 2 so that the heat insulating layer 14 is on the heat exchanger 2 side and the heat insulating layer 14 is on the exterior side.

FIG. 7 shows a linear fuse 12
Is sandwiched between a non-combustible material such as a thin plate of aluminum foil or a vapor-deposited metal film having excellent heat conductivity and a non-combustible separating material 15 such as a thin plate of aluminum foil or a vapor-deposited metal film having excellent heat conductivity, and further separated. The sheet main body 1 is configured by applying an adhesive to the material 15 and sandwiching the linear electric heater 11 and pressing it against a heat insulating material such as glass wool to bond the material. The sheet body 1 is attached to the heat exchanger 2 so that the non-combustible layer 13 is on the heat exchanger 2 side and the heat insulating layer 14 is on the outer side, as in the case shown in FIG. 6.

In FIG. 8, reference numeral 21 is a freezing prevention circuit of the water heater, and 20 is a temperature detecting device or the like arranged in a proper place inside the exterior. When the temperature detection device 20 detects that the ambient temperature inside the exterior has dropped and the contacts are closed in the freeze prevention circuit 21,
The linear electric heater 11 of the seat body 1 is energized, and the electric heater 11 generates heat to raise the temperature and prevent freezing in the device. Then, when the temperature detecting device 20 detects that the ambient temperature inside the exterior has risen and opens the contact, the power supply to the electric heater 11 is stopped.

In FIG. 9, reference numeral 22 denotes a combustion control circuit of the water heater, and when the linear fuse 12 of the seat body 1 is blown out due to outflow of exhaust gas due to damage of the heat exchanger 2, a fuse is added to the combustion control circuit 22. The fusing signal 12 is output, the combustion control circuit 22 determines an abnormality, and shifts to safe operation.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it is needless to say that the present invention can be implemented in various forms without departing from the gist of the present invention. Is.

Industrial Applicability The present invention is a water heater in which a sheet-like main body is formed by holding a linear electric heater and a linear fuse in a sheet, and the sheet body is attached to a heat exchanger. Produce the effect of.

By holding the linear electric heater and the linear fuse on the sheet, the metal fittings fixing each device are deformed / displaced due to a mistake in manufacturing or vibration during transportation as in the prior art. Since no mistakes will be made during assembly during repair, the wire fuse will break and shift to safe operation only in abnormal situations such as damage to the heat exchanger, reducing unnecessary safe operation and making the water heater comfortable. Can be used. Also,
Since unnecessary fittings are not used, the number of manufacturing steps and the number of parts can be reduced to reduce the cost.

Further, as an effect of claim 2, in addition to the effect of the invention of claim 1, the abnormality of the heat exchanger can be detected in a wide range, so that the range in which the linear fuse is wound can be reduced and the cost per unit cost can be reduced. Can be further reduced.

As the effect of claim 3, in addition to the effect of the invention of claim 1 or claim 2, the heat-retaining property of the heat exchanger is improved, so that the temperature of hot water in the heat exchanger is less likely to decrease. Therefore, the stability of the hot water discharge temperature is improved, the hot water can be used more comfortably, and the outer surface temperature of the water heater can be lowered.

[Brief description of drawings]

FIG. 1 is a configuration diagram in which a seat body according to an embodiment of the present invention is attached to a heat exchanger.

FIG. 2 is a plan view of a seat body showing an embodiment of the present invention.

FIG. 3 is a vertical sectional view showing an embodiment of the present invention.

FIG. 4 is a vertical sectional view showing an embodiment of the present invention.

FIG. 5 is a vertical sectional view showing an embodiment of the present invention.

FIG. 6 is a vertical sectional view showing an embodiment of the present invention.

FIG. 7 is a vertical sectional view showing an embodiment of the present invention.

FIG. 8 is a schematic circuit diagram of a linear electric heater of a seat body and a freeze prevention circuit of a water heater.

FIG. 9 is a schematic circuit diagram of a linear fuse of a seat body and a combustion control circuit of a water heater.

FIG. 10 is a conventional configuration diagram in which a fuse and an electric heater are separately attached to a heat exchanger.

[Explanation of symbols]

1 seat body 2 heat exchanger 3 trunk pipe 4 fuse fasteners 5 Fuse guide 10 Base material 11 Electric heater 12 fuse 13 Incombustible layer 14 Thermal insulation layer 15 Separation material 20 Temperature detector 21 Freezing prevention circuit 22 Combustion control circuit

Claims (4)

[Claims] 1. A sheet main body is formed by holding a linear electric heater that generates heat when energized and a linear fuse that is conductive and melts at a preset temperature to form a sheet main body. A water heater characterized by being attached to a heat exchanger. 2. The water heater according to claim 1, wherein a heat-transferring non-combustible layer is formed on one side or both sides of the seat body, and the seat body is attached to the heat exchanger with the non-combustible layer facing the heat exchanger side. . 3. The water heater according to claim 1, wherein a heat insulating layer is formed on the other side of the sheet body, and the sheet body is attached to the heat exchanger with the heat insulating layer facing the exterior. 4. The water heater according to claim 1, wherein the electric heater of the seat body is incorporated in the freeze prevention circuit, and the fuse of the seat body is incorporated in the combustion control circuit.