JP3432528B2 - Circulating water heater for bath - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating water heater for a bath which can be taken at any time without changing the hot water in a bathtub. [0002] In recent years, interest in bath life has increased as one of the manifestations of a desire for a healthy and comfortable life, and circulating water heaters have been installed at the time of new construction or extension or renovation of houses, or portable type. In many cases, circulating water heaters are installed in existing bathtubs. [0003] Circulating water heaters require no replacement of hot water and can be bathed 24 hours a day, and furthermore, the generation of hot water is suppressed and the bathtub is not cleaned, so that the demand is expanding and each company is newly entering. FIG. 2 is a view showing the configuration of a conventional bath circulating water heater. In FIG. 2, 1 is a bathtub, 2 is a pump for circulating hot water, 3 is a filter for filtering large trash, Reference numeral 4 denotes a filter medium that filters fine dust and performs a bactericidal action. The hot water in the bathtub is sent to the filter 3 by the pump 2 and passes through the filter, where large trash such as hair is captured at this stage. Next, the hot water is purified by passing through the filter medium 4. As means for this purification, various methods have been adopted by various companies, such as adsorption with zeolite or activated carbon, filtration with glass beads or the like, or production filtration in which organisms are carried on a filter medium to decompose organic substances. [0005] However, in the case of adsorption on zeolite or activated carbon, turbidity or odor of hot water is generated due to accumulation of organic substances and propagation of bacteria after a long operation time. Filtration with a glass bead also produces turbidity and odor, which results in the formation of mudballs and improper filtration. [0006] Biological filtration, in which bacteria are naturally propagated and fixed on a filter medium to decompose organic substances, takes several weeks for colonization of the bacteria, during which turbidity or sliminess occurs in the bathtub water. In particular, this turbidity is caused by bacteria, the particle size of which is mostly 1 μm or less, and the turbidity thus generated cannot be removed without microfiltration. It is not possible as a real problem and cannot be eliminated after all. [0007] Furthermore, purification by ozone has a rapid effect on purification of hot water, and decomposes into organic matter without turbidity or sliminess caused by bacteria. However, in the purification using ozone, the concentration actually used for purification is 10% or less of the concentration of the injected ozone gas, and the decomposition treatment must be performed by exhausting the gas at almost the initial concentration. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the ozone gas utilization efficiency is improved by mixing ozone gas into a purification system and reusing waste ozone gas after use in the purification treatment. It is an object of the present invention to provide a circulating water heater for a bath which is free from turbidity, sliminess and odor. The present invention provides a pump for guiding hot water from a bathtub to a filter, an ozone gas generator for generating ozone gas for preventing odor and turbidity of the hot water,
A filter for filtering hot water, provided at an intermediate portion of a pipe installed between the pump and the upper portion of the filter,
The ozone gas generated by the ozone gas generator is pulled
An injector for the hot and mixed-crowded, a pipe for guiding a part of the waste ozone gas after used for purification of the filter by the suction force of the injector in the raw material gas service entrance of the ozone gas generator, to the pipe An ozone gas decomposition catalyst for decomposing waste ozone gas is provided in the branched pipe. According to the present invention, the utilization efficiency of ozone gas is increased, and the power consumption for generating ozone gas is reduced. Furthermore, since the load on the ozone decomposition catalyst is reduced, the life of the catalyst is prolonged. In addition, using one injector,
Mixing of water and ozone gas and re-use of waste ozone gas
It has a simplified configuration that can be used efficiently.
You. FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. In FIG. 1, 1 is a bathtub, 2 is a pump for circulating hot water, 3 is a filter for filtering hot water, and the filter 3 has glass beads 4 (200 μm, 1.5 μm) as a filter medium.
kg) is filled. Further, a pipe 5 for exhausting waste ozone gas is provided, and a solenoid valve 6 and an ozone gas decomposition catalyst 7 for adjusting exhaust are installed in this pipe. The solenoid valve 6 operates in conjunction with a water level sensor 8 for keeping the water level in the filter 3 constant. 9 is an ozone generator (ozone gas concentration 100 PPM, gas flow rate 1.5 liter / min), and 10 is an injector for drawing ozone gas. Now, the hot water discharged from the bathtub 1 by the pump 2 is mixed with the ozone gas from the ozone gas generator 9 by the injector 10 in a gas-liquid mixture, and enters the filter 3 to purify the hot water. Waste ozone gas is filtered by filter 3
The water is separated from the hot water and decomposed and discharged by the ozone gas decomposition catalyst 7, but the piping is branched in the middle and the injector 10
Is again drawn into the source gas inlet of the ozone gas generator 9 and reused for ozone gas generation. [0013] A circulation test of hot water was carried out with this apparatus. (Comparative Example) A hot water circulation test was conducted using the same apparatus as in the example, but the waste ozone gas was directly exhausted to the decomposition catalyst without branching the pipe for ozone exhaustion. In the hot water circulation test, five people take a bath every day,
Turbidity of warm water every 24 hours was determined by measuring the absorbance at 660 nm with a spectrophotometer, and the degree of odor was examined. E. coli count in warm water (E. coli test; desoxycholate medium)
OXID) and COD for 200 hours. Table 1 shows the results. [Table 1] From Table 1, the turbidity of the example is as low as about 1, and
COD was also about 1. Neither odor nor Escherichia coli was recognized. On the other hand, in the comparative example, the turbidity increased with time, and when the particle size distribution of the particle size was examined, the average particle size was 0.6 μm. The odor began to develop after 24 hours, was clearly confirmed after 168 hours, and E. coli
It was confirmed after 4 hours and increased. At this time, the ozone gas concentration of the comparative example was measured and found to be 60 ppm. It is considered that the hot water was spoiled due to the insufficient ozone gas concentration. Therefore, in the present invention, even with the same ozone gas generator (power supply, electrode), the use efficiency of ozone gas can be increased, and the efficiency of hot water purification can be increased. As described above, the bath circulating water heater of the present invention comprises a pump for guiding hot water from a bathtub to a filter,
In a bath circulating water heater having a filter for filtering hot water and an ozone gas generator, the efficiency of hot water purification can be increased by reusing waste ozone gas from the filter and increasing the use efficiency of ozone. Was. Moreover, one a
Mixing hot water and ozone gas using an injector, and
Waste ozone gas can be drawn in and reused efficiently
A simplified configuration was achieved. As a result, no odor or turbidity was observed in the warm water even after 24 hours of operation,
Especially 1μm caused by bacteria that cannot be filtered by ordinary filtration
The following turbidity can be prevented, the filter medium does not become mudballed, and the energy saving and cost reduction of the circulating water heater for a bath which can perform filtration normally can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration of an embodiment of the present invention. FIG. 2 is a view showing the configuration of a conventional bath circulating water heater. [Explanation of symbols] 1 ... bathtub, 2 ... pump, 3 ... filter, 4 ... filter media
(Glass beads), 5: piping, 6: solenoid valve, 7: ozone gas decomposition catalyst, 8: water level sensor, 9: ozone gas generator, 10: injector.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C02F 1/50 531 C02F 1/50 540A 540 B01D 35/02 J (72) Inventor Hirofumi Nakamura 1006 Odakadoma, Kazuma, Kadoma, Osaka Matsushita Inside Electric Appliances Co., Ltd. (72) Noriaki Seki, Inventor 1006 Kazuma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd.Akira Akamatsu 1006 Kadoma, Kazuma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-3-161092 (JP, A) JP-A-3-193188 (JP, A) JP-A-51-754 (JP, A) JP-A-62-225242 (JP, A) 63-136714 (JP, U)

Claims (1)

(57) [Claims] [Claim 1] A pump for guiding hot water from a bathtub to a filter, an ozone gas generator for generating ozone gas for preventing odor and turbidity of hot water, and for filtering hot water and filter, said hot and mixed-provided at an intermediate portion of the installed <br/> pipe, draw ozone gas generated by said ozone gas generator between the filter top and the pump The injector and the suction force of the injector
A pipe that guides a part of the waste ozone gas used for purification in the filter to the raw material gas inlet of the ozone gas generator, and an ozone gas decomposition catalyst that is provided in a pipe branched from the pipe and decomposes waste ozone gas. A circulating water heater for a bath, comprising: