JP2009097830A - Storage water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a storage water heater, simplifying the structure of a hot water storage tank. <P>SOLUTION: This storage water heater includes: a stainless steel-made hot water storage tank 2 having a flange mounting hole 2a on the wall part; a stainless steel-made flange 12 mounted on the hot water storage tank 2 to block up the flange mounting hole 2a; a water heating heater 5 covered with a stainless steel-made pipe and fitted to the flange 12; and a sacrificial anode 7 fitted to the flange 12 and having a larger ionization tendency than iron. A valve element 22 of a pressure relief valve 20 fitted to the flange 12 also serves as the sacrificial anode. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot water storage type water heater, and more particularly, to corrosion prevention of a water heater and a hot water storage tank.

  In a conventional hot water storage type hot water heater, an anticorrosive metal serving as a sacrificial anode is attached to the hot water storage tank in order to prevent corrosion of the water heater and the hot water storage tank (see, for example, Patent Document 1).

JP 62-228494 A (1st page, FIG. 4)

  However, in the above-described conventional hot water storage type hot water heater, the water heater and the anticorrosion metal serving as the sacrificial anode in the hot water storage tank are separately attached to the hot water storage tank. For this reason, it is necessary to provide a dedicated mounting flange for mounting the anticorrosive metal serving as a sacrificial anode in the hot water storage tank.

  The present invention has been made in view of the above, and there is no need to provide a dedicated mounting flange for mounting a metal for corrosion protection as a sacrificial anode in the hot water storage tank, and a hot water storage type in which the structure of the hot water storage tank is simplified. The purpose is to obtain a water heater.

  In order to solve the above-described problems and achieve the object, the present invention provides a stainless steel hot water storage tank having a flange mounting hole in a wall portion and a stainless steel hot water tank attached to the hot water storage tank so as to close the flange mounting hole. And a water heater covered with a stainless steel pipe and attached to the flange, and a sacrificial anode attached to the flange and having a higher ionization tendency than iron.

  According to the present invention, there is no need to provide a dedicated mounting flange for mounting the anticorrosion metal serving as a sacrificial anode on the hot water storage tank, and the structure of the hot water storage tank can be simplified.

  Hereinafter, an embodiment of a hot water storage type water heater according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view showing Embodiment 1 of a hot water storage type water heater of the present invention, and FIG. 2 is a partial sectional side view of a water heater and sacrificial anode attached to a flange of Embodiment 1. FIG. It is. As shown in FIG. 1, a hot water storage water heater 100 includes a rectangular water heater housing 1, a sealed cylindrical stainless steel hot water storage tank 2 housed in the water heater housing 1, and a hot water storage tank 2. A water supply pipe 3 connected to the bottom, a hot water supply pipe 4 connected to the top of the hot water storage tank 2, and a temperature sensor 6 attached to the outer surface of the wall of the hot water storage tank 2 are provided.

  A flange mounting hole 2 a is provided in the wall portion of the hot water storage tank 2. A flat stainless steel flange 12 is attached with a screw or the like so as to close the flange attachment hole 2a, and a water heater 5 bent in a crank shape and covered with a stainless steel pipe at the lower portion of the flange 12 is provided. The rod-shaped anticorrosive metal 7 serving as a sacrificial electrode is attached to the upper portion of the flange 12 by welding via a mounting rod 17 (see FIG. 2). For the anticorrosion metal 7, for example, a stainless material or a copper material having a higher ionization tendency than iron is used for the hot water storage tank 2 and the water heater 5.

  As shown in FIG. 2, the water heater 5 includes a stainless steel pipe 11 bent in a crank shape, a heating wire 14 covered with the stainless steel pipe 11, and a base (flange mounting) of the stainless steel pipe 11 connected to the heating wire 14. Terminal rod 13 led out to the outside of the part) and insulating powder 15 enclosed in the stainless steel pipe 11 and insulating between the heating wire 14 and the terminal rod 13 and the stainless steel pipe 11.

  A mounting rod 17 is screwed into the anticorrosion metal 7 and the mounting rod 17 and the stainless steel pipe 11 are welded to the flange 12 for mounting. Thereby, the water heater 5 and the anticorrosion metal 7 as the sacrificial anode can be integrally attached to the flange 12, and there is no need to provide a dedicated attachment flange for attaching the anticorrosion metal 7 in the hot water storage tank 2. The structure of the hot water storage tank 2 can be simplified.

  Next, the operation of the hot water storage type water heater 100 of the first embodiment will be described. Water is supplied from the water supply pipe 3 to the hot water storage tank 2 to fill it up, and the water heater 5 is energized and heated. The hot water temperature is detected by the temperature sensor 6 attached to the wall portion of the hot water storage tank 2, and when the set hot water temperature is reached, the energization of the water heater 5 is stopped. The hot water in the hot water storage tank 2 that has reached the set hot water temperature is pushed out to the hot water supply pipe 4 by the supply water pressure from the water supply pipe 3, and is supplied from the hot water supply pipe 4 for use.

  When the hot water storage tank 2 made of stainless steel and the anticorrosion metal 7 which is a higher ionization tendency than the hot water storage tank 2 and is a sacrificial anode are electrically connected and immersed in water, the ionization is performed in comparison with the hot water storage tank 2 having a lower ionization tendency. The corrosion-preventing metal 7 having a large tendency is corroded sacrificially and suppresses corrosion of the hot water storage tank 2. The anticorrosion effect of the hot water storage tank 2 is obtained by the corrosion protection metal 7 being corroded first and releasing electrons, supplying electrons to the hot water storage tank 2 and preventing the hot water storage tank 2 from emitting electrons.

Embodiment 2. FIG.
FIG. 3 is a partial cross-sectional side view of a water heater and a pressure relief valve attached to a flange, showing Embodiment 2 of the hot water heater according to the present invention. As shown in FIG. 3, the water heater 5 is equivalent to that of the first embodiment, and thus detailed description thereof is omitted.

  A cylindrical stainless steel valve housing 21 of a pressure relief valve 20 having an inner end plate 21a and an outer end plate 21b is attached to the upper portion of the stainless steel flange 12 by welding. The inner end plate 21a and the outer end plate 21b are provided with holes. A rod-shaped copper valve body 22 of the pressure relief valve 20 having a flange portion at the base end portion projects into the hot water storage tank 2 from the hole of the inner end plate 21a. The valve body 22 becomes a sacrificial anode. A spring 24 is installed in the valve housing 21 to press the proximal end of the valve body 22 so that the valve body 22 protrudes into the hot water storage tank 2.

  A packing 23 is mounted inside the casing of the inner end plate 21a, and the flange 23 of the valve body 22 is pressed against the packing 23 so that the hot water in the hot water storage tank 2 does not leak from the hole of the inner end plate 21a. Yes. A water distribution pipe 25 is connected to the rear end of the valve housing 21. An electrode 26 for detecting a hot water leak from the hot water storage tank 2 is attached to the water distribution pipe 25.

  When the pressure in the hot water storage tank 2 rises abnormally and exceeds the relief pressure set in advance by the spring 24, the flange portion of the valve body 22 of the pressure relief valve 20 is pushed into the valve housing 21 and the inner end plate 21a. And the hot water in the hot water storage tank 2 flows out of the water distribution pipe 25 to prevent the hot water storage tank 2 from being damaged. At this time, the hot water flowing out can be detected by the electrode 26 to detect an abnormal increase in pressure. In addition, when the valve element 22 serving as the sacrificial anode is corroded and dissolved to reach the end of its life, hot water flows out to the drain pipe 25, so that the life can be detected by the electrode 26.

  The electrode 26 detects the hot water discharged when the pressure in the hot water storage tank 12 rises abnormally only when the hot water storage tank 2 is heated, and the valve element 22 serving as the sacrificial anode is corroded and dissolved. When the end of the service life is reached, the hot water always flows into the drain pipe 25 and the electrode 26 detects this. Therefore, due to this difference, the pressure in the hot water storage tank 12 is increased abnormally or the valve body 22 is corroded and dissolved. Can be determined.

  As described above, the hot water storage water heater according to the second embodiment does not require a dedicated mounting flange for mounting the anticorrosion metal 22 serving as a sacrificial anode to the hot water storage tank 2, and simplifies the structure of the hot water storage tank 2. be able to.

  Further, a wear detecting device for detecting that the valve element 22 serving as the sacrificial anode is corroded, melted and consumed, and a pressure relief for protecting the hot water tank 2 when an abnormal pressure is applied to the hot water tank 2. The pressure relief valve operation detection device for detecting that the valve 20 has been operated can be combined with a single detection device (electrode 26), improving the reliability of the hot water heater 100 and reducing the manufacturing cost. Can be reduced.

  As described above, the hot water storage water heater according to the present invention is useful as an inexpensive type with a simple structure.

It is a longitudinal cross-sectional view which shows Embodiment 1 of the hot water storage type water heater of this invention. 2 is a partial cross-sectional side view of a water heater and a sacrificial anode attached to the flange of Embodiment 1. FIG. It is a partial cross section side view of the water heater and pressure relief valve which were attached to the flange which shows Embodiment 2 of the hot water storage type water heater of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water heater housing 2 Hot water storage tank 2a Flange mounting hole 3 Water supply pipe 4 Hot water supply pipe 5 Water heater 6 Temperature sensor 7 Corrosion prevention metal (sacrificial anode)
11 Stainless Steel Pipe 12 Flange 13 Terminal Bar 14 Heating Wire 15 Insulating Powder 17 Mounting Bar 20 Pressure Relief Valve 21 Valve Housing 21a Inner End Plate 21b Outer End Plate 22 Valve Element 23 Packing 24 Spring 25 Drain Pipe 26 Electrode 100 Hot Water Heater

Claims (2)

A stainless steel hot water storage tank with a flange mounting hole in the wall,
A stainless steel flange attached to the hot water storage tank so as to close the flange attachment hole;
A water heater covered with a stainless steel pipe and attached to the flange;
A sacrificial anode attached to the flange and having a greater ionization tendency than iron;
A hot water storage water heater characterized by comprising.   The hot water storage water heater according to claim 1, wherein the sacrificial anode is also used as a valve body of a pressure relief valve attached to the flange.

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