JP2002286294A - Heater for heating water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heater for heating water having a high strength against a vibration or an impact, low in cost and long in lifetime. SOLUTION: The heater 2 for heating the water comprises lead bars 7, heating wires 8 insulated from metal pipes 6 of their outer peripheries in such a manner that the pipes 6 are coupled with reinforcing plates 10. In this heater 2, the plates 10 are each constituted of a material which is weaker for a corrosion than those of the pipes 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater for use in a hot water storage type water heater or the like.

[0002]

2. Description of the Related Art FIG. 7 is a structural view of a tank portion of a conventional hot water storage type water heater, FIG. 8 is a side view showing a part of a water heating heater of FIG. 7 in cross section, and FIG. FIG. 10 is a side view of FIG.
FIG. As shown in FIG. 7, a pair of water heating heaters 2 (hereinafter, simply referred to as “heaters”) bent substantially in a Z-shape are formed on a flange 3 on an inner wall of a tank 1 of a hot water storage type water heater for storing and heating water. The tank 1 is provided with a water supply port 4 at the lower part and a tap hole 5 at the upper part.

As shown in FIGS. 8, 9 and 10, the heater 2 has a heater tube composed of a hollow metal pipe 6 having a circular cross section, and has an outer periphery inside which a magnesia 9 made of insulating material is interposed. A lead bar 7 having one end protruding from the flange 3 and a coil-shaped heating wire 8 connected to the other end of the lead bar 7 are inserted. In addition, stainless steel or copper is generally used for the metal pipe 6.

[0004] Reference numeral 10a denotes a reinforcing plate made of the same material as that of the metal pipe 6, and is provided at a place away from the flange 3 in order to prevent the upper tube 2a and the lower tube 2b of the heater 2 from colliding with each other due to vibration or the like. The upper tube 2a and the lower tube 2b are firmly connected by screws, caulking or the like. In recent years, since the capacity of the tank 1 has been gradually increased, and the capacity of the heater 2 has been increased at the same time, the heater 2 becomes long and heavy, and cracks and cracks occur in the metal pipe 6 of the heater 2 due to vibration during transportation. In some cases, a reinforcing plate 10a is attached as a countermeasure.

[0005] The heater 2 for the hot-water storage type water heater configured as described above injects water into the tank 1 from the water supply port 4 of the tank 1 of the hot-water storage type water heater, and the water is heated by the heater 2 and discharged. The hot water is poured from the gate 5. Heating of the heater 2 is performed by heating the heating pipe 8 by the current from the lead bar 7 of the heater 2 and heating the metal pipe 6 via the magnesia 9. At this time, the lead bar 7 hardly generates heat. . Since the upper tube 2a and the lower tube 2b of the heater 2 are fixed by the reinforcing plate 10a, they do not collide with each other even if vibration occurs.

[0006]

According to the heater for water heating constructed as described above, the reinforcing plate 10a is firmly attached to the heater 2, but the reinforcing plate 10a and the metal pipe 6 are located between the reinforcing plate 10a and the metal pipe 6. When a gap is formed and crevice corrosion occurs from that portion and a hole is opened in the metal pipe 6, a short circuit occurs and the heater 2 cannot be used, resulting in a problem that the life of the heater 2 is shortened.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is resistant to vibration and impact and inexpensive by devising the material of the reinforcing plate, the mounting position, the shape of the metal pipe, and the shape of the flange. And a long-life heater for water heating.

[0008]

According to the present invention, there is provided a water heating apparatus comprising a heater having a lead bar and a heating wire, which are insulated from a metal pipe on an outer periphery thereof, wherein the metal pipes of the heater are connected to each other by a reinforcing plate. In the heater of the present invention, the reinforcing plate is made of a material that is more susceptible to corrosion than the material of the metal pipe.

A heater for water heating having a lead bar and a heating wire insulated from a metal pipe on the outer periphery thereof and connecting the metal pipes of the heater with a reinforcing plate is provided. Was attached to the non-heat-generating part near the mouth.

Further, in a water heater having a lead bar and a heater having a heating wire which is insulated from an outer peripheral metal pipe, a bent portion of the metal pipe is formed in a cross-sectional shape having a corner.

Further, in a water heating heater provided with a heater having a lead bar and a heating wire and insulating them from an outer metal pipe, a groove is provided around the metal pipe of a flange supporting the heater.

[0012]

[First Embodiment] FIG. 1 is a perspective view of a heater for water heating according to a first embodiment of the present invention. Note that FIG. 1 is substantially the same as FIG. 8 and FIG. 9, and the same reference numerals are given to the overlapping portions, and the description is simplified (the same applies hereinafter).
Reference numeral 2 denotes a heater for water heating (hereinafter simply referred to as a heater), a hollow metal pipe 6 having a circular cross section forms an outer periphery, and one end thereof protrudes toward the flange 3 through a magnesia 9 of an insulating material. Inserted lead bar 7 and coil-shaped heating wire 8 connected to the other end of lead bar 7 are inserted.

Reference numeral 10 denotes a reinforcing plate which is separated from the flange 3 by screws or caulking to prevent the upper tube 2a and the lower tube 2b of the heater 2 from colliding with each other due to vibration or the like. The lower tube 2b is firmly connected. The reinforcing plate 10 is made of a material that is more susceptible to corrosion than the material of the metal pipe 6 and is susceptible to corrosion, so that even if crevice corrosion occurs, it is preferentially corroded. It has a long life. For example, when stainless steel is used for the metal pipe 6, copper, aluminum, magnesium, or the like is used for the reinforcing plate 10, and when copper is used for the metal pipe 6, aluminum, magnesium, or the like is used for the reinforcing plate 10. I do.

According to the present embodiment, the heating of the heater 2 is performed by heating the heating wire 8 by the current from the lead bar 7 and heating the metal pipe 6 through the magnesia 9. Thus, the water outside the heater 2 is heated. If the heater 2 is repeatedly used for heating, crevice corrosion may occur. However, since the material of the reinforcing plate 10 is more vulnerable to corrosion than the material of the heater 2, the reinforcing plate 10 is preferentially corroded, and the metal pipe 6 Is not corroded. When vibrations or the like occur during use of the hot water storage type water heater or the like, since the upper tube 2a and the lower tube 2b of the heater 2 are fixed by the reinforcing plate 10, they do not collide with each other. When the heater for water heating according to the present embodiment is used, it has a long life and is resistant to vibration and impact.

Second Embodiment FIG. 2 is a perspective view of a water heater according to a second embodiment of the present invention. In the first embodiment, the case where the reinforcing plate 10 is attached to the metal pipe 6 at a position away from the flange 3 has been described. However, in the present embodiment, the non-heating portion near the mouth of the heater 2, that is, the lead bar 7 is The reinforcing plate 10 for connecting the upper pipe 2a and the lower pipe 2b is attached to the metal pipe 6 in the portion where it is located.

The portion of the metal pipe 6 where the heating wire 8 is located is
Here, since the water is heated, if the reinforcing plate 10 is attached to this position, the corrosion in the gap between the reinforcing plate 10 and the metal pipe 6 is accelerated as the water temperature rises. For this reason, by attaching the reinforcing plate 10 to the non-heat generating portion near the mouth of the heater 2, corrosion occurring in the gap between the reinforcing plate 10 and the heater 2 is prevented from being accelerated. In order to withstand vibration and impact, the reinforcing plate 10 needs to be more firmly attached than when it is generally attached, but the heater 2 has a long life. When the water heater according to the present embodiment is used,
Long life, resistant to vibration and shock.

Third Embodiment FIG. 3 is a side view showing a part of a water heater 2 according to a third embodiment of the present invention in cross section, and FIG. 4 is a cross sectional view of a bent portion in FIG. . In the first embodiment, the cross-sectional shape of the heater 2 is circular, but in the present embodiment, the cross-sectional shape of the heater 2 at the bent portion is a shape having a corner other than a circle, such as a right angle or an acute angle. . In FIG. 3, 11a and 11b are heaters 2.
Of the upper tube 2a, 11c and 11d are heaters 2.
In order to increase the rigidity at the bent portion of the lower tube 2b, as shown in FIG. 4 (a), the D-shaped cross section, that is, the shape of the metal pipe 6 is configured to be a D-shaped cross section. It is. In addition, also in this bending part 11a-11d,
Like the other heaters 2, the heating wire 8 is insulated from the metal pipe 6 by the insulating material magnesia 9.

According to the present embodiment, when vibration or the like is applied to the heater 2 during transportation or the like, the heater 2 vibrates with the attachment portion of the heater 2 to the flange 3 and the bent portions 11a to 11d serving as fulcrums. At this time, since the bent portions 11a to 11d have a shape having a corner portion like a D-shaped cross section to increase rigidity, a swing width of vibration and a resonance point are changed, and are added to a mounting portion of the heater 2 to the flange 3. Stress can be reduced, and cracks and cracks do not occur in the metal pipe 6 of the heater 2. Furthermore, since the reinforcing plate is reinforced without being attached, the life of the heater 2 is not shortened due to excessive corrosion.

In the above description, the bent portion 11a
11d are formed in a D-shaped cross section, for example, as shown in FIG.
(C), and a quadrangular cross section as shown in FIG. 4 (c). When the water heater according to the present embodiment is used, it is inexpensive, has a long life, and is resistant to vibration and impact.

Fourth Embodiment FIG. 5 is a front view of a water heater according to a fourth embodiment of the present invention, and FIG. 6 is a side view showing a part of FIG. 5 in cross section. In the present embodiment, a groove is provided in a portion of the flange 3 surrounding the metal pipe 6 of the heater 2. 12 is a metal pipe 6 of the flange 3
Is formed in a portion surrounding the metal pipe 6 at a certain distance from the periphery of the metal pipe 6, for example, on the protruding surface of the lead bar 7 of the flange 3.

By forming the groove 12 in this way and imparting a difference in strength to the flange 3, the stress concentrated at the mounting portion of the flange 3 is dispersed and relieved to the weak portion of the flange 3, thereby reducing the stress during transportation. The stress applied to the mounting portion of the flange 3 can be reduced with respect to vibration, and cracks and cracks do not occur in the metal pipe 6 of the heater 2. When the water heater according to the embodiment is used, the heater is inexpensive, has a long life, and is resistant to vibration and impact.

[0022]

As is apparent from the above description, the present invention comprises a heater having a lead bar and a heating wire, which are insulated from the metal pipe on the outer periphery, and the metal pipes of the heater are connected to a reinforcing plate. In the water heater combined with
Since the reinforcing plate is made of a material that is less susceptible to corrosion than the material of the metal pipe, it is possible to provide a water heater that has a long life and is resistant to vibration and impact.

A water heating heater having a lead bar and a heating wire which is insulated from a metal pipe on the outer periphery of the heater and connecting the metal pipes of the heater with a reinforcing plate is provided. Since the heater for water heating is attached to the non-heat-generating portion near the mouth, it is possible to provide a heater for water heating that has a long life and is resistant to vibration and impact.

Further, in the water heater having a lead bar and a heating wire having a heater insulated from the outer peripheral metal pipe, the bent portion of the metal pipe is formed in a cross-sectional shape having a corner. It is possible to provide a water heater that is inexpensive, has a long life, and is resistant to vibration and impact.

Also, in the water heater having a lead bar and a heating wire having a heater insulated from the outer peripheral metal pipe, the groove is provided around the metal pipe of the flange supporting the heater. It is possible to provide a water heater that is inexpensive, has a long life, and is resistant to vibration and impact.

[Brief description of the drawings]

FIG. 1 is a perspective view of a water heater according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view of a heater for water heating according to Embodiment 2 of the present invention.

FIG. 3 is a side view of a water heater according to Embodiment 3 of the present invention.

FIG. 4 is a sectional view of a bent portion of FIG.

FIG. 5 is a front view of a water heating heater according to Embodiment 4 of the present invention.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a configuration diagram of a tank of a conventional hot water storage type water heater.

8 is a side view of the water heater of FIG. 7;

FIG. 9 is a side view of a main part of FIG.

FIG. 10 is a sectional view of FIG. 9;

[Explanation of symbols]

2 heater for water heating, 2a upper tube for heater, 2b lower tube for heater, 3 flange, 6 metal pipe, 7 lead bar, 8 heating wire, 9 insulating material, 10 reinforcing plate, 1
1a to 11d Folded portions, 12 grooves.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhei Kawashima 2-3-2 Marunouchi 2-chome, Chiyoda-ku, Tokyo F-term (reference) 3L025 AB21

Claims (4)

[Claims] 1. A water heater comprising a lead bar and a heating wire having a heating wire insulated from a metal pipe on the outer periphery thereof, wherein the metal pipes of the heater are connected to each other by a reinforcing plate. A heater for water heating, wherein the heater is made of a material that is more susceptible to corrosion than the material of the metal pipe. 2. A water heater comprising a heater having a lead bar and a heating wire insulated from a metal pipe on an outer periphery thereof, wherein the metal pipes of the heater are connected to each other by a reinforcing plate. A heater for heating water, wherein the heater is attached to a non-heat-generating portion near the mouth of the heater. 3. A water heater having a lead bar and a heating wire having a heater insulated from a peripheral metal pipe, wherein a bent portion of the metal pipe is formed in a cross-sectional shape having a corner. A heater for heating water, characterized in that: 4. A heater for water heating comprising a heater having a lead bar and a heating wire and insulating them from an outer metal pipe, wherein a groove is provided around the metal pipe of a flange supporting the heater. A heater for heating water.