JPH0363440B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a water heater that uses gas, oil, electricity, or solar heat as a heat source and has a heat exchanger made of copper or copper alloy, aluminum, or aluminum alloy. Conventional configuration and its problems This type of conventional hot water supply equipment is shown in FIGS. 1 and 2. FIG. 1 shows a conventional example of a water heater using gas as a heat source. Combustion heat generated from a flame 2 of a burner 1 is heat-exchanged by a heat exchanger 3 made of copper or a copper alloy. converts city water supplied by the city into hot water. Note that the hot water is discharged from the hot water supply pipe 5. In this water heater, when a bathtub, washbasin, towel, or the like is filled with water that has been retained in the inner tube of the heat exchanger 3 for a long time, an insoluble blue-colored substance may adhere to the water heater. This is because weakly acidic water and water containing a large amount of free carbonic acid and sulfate ions flow into the inner tube of the heat exchanger 3, causing a large amount of copper ions to be eluted, and the eluted copper ions to be mixed with the bathtub, washbasin, etc. This is because the soap adhering to the towel or fatty acids contained in sweat and grime react to produce copper soap. This problem is called the "blue water problem." Furthermore, aluminum heat exchangers also have the problem of corroding and producing a white suspension when weakly acidic water or water containing large amounts of sulfate ions flows into the heat exchanger. Purpose of the Invention In order to solve the above-mentioned conventional disadvantages, the present invention neutralizes weakly acidic water or water containing a large amount of free carbonic acid and sulfate ions, and uses the water as neutral water. The purpose is to suppress the elution of exchanger base material metal ions. Structure of the Invention In order to achieve this object, the present invention forms a zigzag water flow path, and a water treatment device storing a solid basic substance in this water flow path forms a loop with a heat exchanger. It is arranged in a water flow path or a water supply flow path. By using this configuration,
The weakly acidic water is neutralized by the solid basic substance and becomes neutral water, which flows into the heat exchanger. As a result, the elution of the base metal of the heat exchanger is suppressed. In addition, when water heating equipment is shut down, the water in the water treatment equipment becomes alkaline due to solid basic substances, and the calcium and magnesium salts present in the water become precipitates of insoluble compounds (e.g., magnesium carbonate, calcium carbonate, etc.). ) However, by opening the plug removably provided at the bottom or lower side of the case, the precipitate of the insoluble compound is discharged out of the case, thereby preventing clogging of the heat exchanger, etc. DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be explained as shown in FIGS. 2, 3, and 4.
5 and 6. FIG. 2 is a schematic diagram of a water heater that is an embodiment of the present invention. The operating principle will be explained. The operating refrigerant that is vaporized by collecting solar heat or atmospheric heat by the heat collecting plate 6 is turned into a high-temperature, high-pressure gas by the compressor 7 and is sent to the refrigerant-side heat exchanger 8 . On the other hand, the city water stored in the hot water storage tank 9 is sucked by the circulation pump 10 via the feed side piping 11, and the neutral water that has come into contact with the solid basic substance 13 stored in the water treatment device 12 is The water becomes water and is sent to the hot water supply side heat exchanger 14. The water that receives and receives heat from the high-temperature, high-pressure operating refrigerant in the refrigerant-side heat exchanger 8 in the hot-water supply-side heat exchanger 14 becomes hot water and returns to the hot-water storage tank 9 via the return-side piping 15. On the other hand, the operating refrigerant becomes a liquid, is depressurized by the expansion valve 16, and is sent to the heat collecting plate 6. By repeating this cycle, the hot water storage tank 9
The temperature of the water increases. The hot water storage tank 9 has a structure in which water is injected through a water supply port 17 and hot water is discharged from a hot water supply port 18. Furthermore, the water treatment device 12 is provided with a removable plug 19 at the bottom of the case. FIG. 3 is a sectional view of a water treatment device installed in a hot water supply device, which is an embodiment of the present invention. Water treatment equipment 1
Reference numeral 2 denotes a case having a removable stopper 19 at the bottom, in which a solid basic substance 13 is stored. The water treatment device 12 has an inlet 20 and an outlet 21
a top lid part 22 having a
3, and a side part 2 made of transparent plastic material.
4, the top cover part 22 and the bottom cover part 23 are supported by a support rod 2.
5, the side surface portion 24 is held. In addition, there are shields 26a and 26b inside the upper lid part 22, and the inlet 20 and the outlet 21
The water flow path is shaped like a zigzag. Moreover, by using the net bodies 27a and 27b, the solid basic substance 13 can be transferred to the inlet 20 and the outlet 20.
I tried to prevent it from flowing into 1. The support rod 25 has female threads at both ends, and the upper lid part 2
2 is fixed with a screw portion 28a, and the bottom cover portion 23 is fixed with a nut 28b. The side surface portion 24 is made of transparent plastic made of acrylic resin, and is fixed by a protrusion 29a provided on the top cover portion 22 and a protrusion 29b provided on the bottom cover portion 23. The top lid part 22 and the bottom lid part 23 are made of corrosion-resistant metal, and are made of stainless steel, tin, nickel, or chromium-plated metal. Examples are Nickel,
It has a chrome-plated structure. Alternatively, a synthetic resin paint such as melamine acrylic resin, melamine resin, silicone resin, or epoxy resin may be applied. Furthermore, plastics such as acrylic resin, polyethylene, polypropylene, ABS, and PVC may also be used. FIG. 4 is a cross-sectional view of another embodiment of the water treatment device arranged in the hot water supply equipment of the present invention. The solid basic substance 13 is stored on a partition plate 30 that has a flowable property, and the partition plate 30 is stored on a fixed plate 3 that has a flowable property.
0' by a spring body 31. This configuration has the advantage that even if the weight of the solid basic substance 13 decreases, it is always lifted upward by the spring body 31, improving contact with water. The partition plate 30, fixing plate 30', and spring body 31 are made of stainless steel, plastic, or the like. FIG. 5 is a cross-sectional view of another embodiment of the water treatment device arranged in the hot water supply equipment of the present invention. The solid basic substance 13 is stored in a flowable separation plate 32 having an outer circumferential length smaller than the horizontal inner circumferential length of the side surface portion 24 . FIG. 6 is a cross-sectional view of another embodiment of the water treatment device arranged in the hot water supply equipment of the present invention. An auxiliary inlet 33 is provided at the tip of the inlet 20, an auxiliary outlet 34 is provided at the outlet 21, and nets 27a' and 27b' are provided respectively. Note that the auxiliary outlet 34 may be omitted. The solid basic substance 13 is calcium or magnesium metal or its alloy, oxide, hydroxide,
Substances containing one or more selected from the group of carbonates are most suitable. These substances are stored in the water treatment device 12 either as they are or filled in a net made of chemical fibers such as polyester, polypropylene, polyvinylidene chloride, polyvinyl chloride, vinylon, nylon, polyethylene, or the like. The effects of the present invention were evaluated using the hot water supply equipment shown in FIG. The hot water supply side heat exchanger of this hot water supply equipment has an inner diameter of
This is a spirally wound 10m phosphorus deoxidizing copper tube with an outer diameter of 1.27cm - 1.59cm.In parallel with this hot water supply side heat exchanger, a refrigerant side heat exchanger is similarly wound spirally and double walled. It is a formula. On the other hand, the hot water storage tank has a glass-lined inner surface and has a hot water storage capacity of 300 ml, and is connected to the inner pipe of the hot water supply side heat exchanger to circulate water at a rate of 5/min. <Experiment 1> A water treatment device with an internal volume of 890 ml was placed inside the sending piping of this hot water supply equipment, and an experiment was conducted by storing a solid basic substance. PH7.1 city water 300
(approximately 10℃) was filled into the hot water storage tank and operated for 24 hours to obtain hot water of 50℃, and the pH and concentration of eluted copper ions were measured. The water treatment equipment used has the structure shown in Figure 3. The results are shown in Table 1.

[Table] <Experiment 2> A hot water storage tank was filled with 300 ml of city water (approximately 10°C) with a pH of 5.8 and operated for 24 hours to obtain hot water of 50°C, and the pH and concentration of eluted copper ions were measured. The experiment was conducted using magnesium alloy grains (the composition and grain dimensions are described above) as the solid basic substance, and by changing the structure of the water treatment device placed in the feed side piping of the hot water supply equipment. The results are shown in Table 2.

[Table] <Experiment 3> Magnesium alloy particles were added to the water treatment equipment shown in Figure 3.
An experiment was conducted by storing 735 g of water and changing its location using the water heater shown in Figure 2. In the experiment, city water (approximately 10℃) with a pH of 5.8 was poured into 300 hot water storage tanks, and the tank was operated for 24 hours to obtain hot water of 50℃, and the pH and concentration of eluted copper ions were measured. The results are shown in Table 3.

[Table] <Experiment 4> Using hot water obtained from the hot water supply equipment shown in Figure 2, an experiment was conducted to color a towel blue using a soap pad. Hot water obtained from conventional hot water equipment (PH5.8,
When a white towel soaked in 0.5% Setsuken liquid (Cu ²⁺ 1.55ppm, Mg ²⁺ 3ppm) was soaked, the towel turned blue after 15 repetitions. On the other hand, hot water (PH
7.3, Cu ²⁺ 0.08ppm, Mg ²⁺ 10ppm), a white towel soaked in 0.5% Setsuken solution did not turn blue even after 30 repetitions. This is because when the present invention is used, the production amount of fatty acid copper (blue compound) decreases due to a decrease in copper ions, and the production amount of fatty acid magnesium (white compound) increases due to an increase in magnesium ions. <Experiment 5> A water treatment device containing magnesium grains was placed in the sending piping of the hot water supply equipment shown in Figure 2, and water was allowed to stay there for two weeks. Precipitates of insoluble compounds such as magnesium and calcium had formed in the water treatment equipment, but the precipitates were removed from the water treatment equipment by opening the stopper and passing the water through a 30-mesh sieve. This operation 1
By repeating this process once a month, the precipitate was removed from the water treatment equipment, and the water flow path of the hot water supply equipment did not become clogged after one year of operation. Effects of the Invention As described above, according to the present invention, (1) weakly acidic water is neutralized by the solid basic substance and flows into the heat exchanger as neutral water;
Elution of base material metal ions from the heat exchanger is suppressed. (2) Precipitates of insoluble compounds formed in the water treatment equipment can be removed by opening the plug provided at the bottom or lower side of the equipment. As a result, clogging of the water flow path of the hot water supply device becomes less likely to occur. (3) Since the elution of base metal ions of the heat exchanger is suppressed, the life of the heat exchanger is extended. Effects such as this will occur.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a conventional water heating device, Fig. 2 is a schematic sectional view showing one embodiment of the water heating device of the present invention, Fig. 3 is a sectional view of the same main part, and Fig. 4 is a similar embodiment. FIG. 5 is a sectional view of a main part according to an example, FIG. 5 is a sectional view of a main part according to another embodiment, and FIG. 6 is a sectional view of a main part according to another embodiment. 11... Sending side piping, 12... Water treatment device, 1
3... Solid basic substance, 14... Hot water supply side heat exchanger, 15... Return side piping, 17... Water supply port, 19
……plug.

Claims (1)

[Scope of Claims] 1. A water treatment device storing a solid basic substance in a zigzag water flow path is installed in a water flow path forming a loop with a heat exchanger or in a water supply flow path to a heat exchanger. The installed hot water equipment. 2 Copper or copper alloy as a heat exchanger, 1 selected from the group of oxides, hydroxides, and carbonates of basic metals or alkaline earth metals as solid basic substances
2. The hot water supply device according to claim 1, which uses a substance containing at least one species. 3 Claim 1 in which magnesium or magnesium alloy is used as the solid basic substance
Water heating equipment as described in section. 4. The water heater according to claim 1, which uses granules as the solid basic substance. 5. The hot water supply device according to claim 1, wherein a part or the entire surface of the water treatment device is made of a transparent material.