JP2000314557A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress crystallization of calcium carbonate due to overheating, and to prevent water flow fault or a heat transfer obstruction due to generation of a scale by providing a Langelier index deciding device in a water supply passage, and regulating a highest temperature of a heat exchanger outlet accord ing to a decided value of a Langelier index. SOLUTION: A water supply tube 2 for supplying water to a water heater body 1 has an input water temperature sensor 31 for detecting the temperature of water from a supply water source, a water quantity sensor 32 for detecting a quantity of the water, and a water quality analysis sensor 33 for detecting the presence or the absence of precipitation of calcium carbonate. The precipitation takes place easily in a water quality of a Langelier index > 0 and/or a stability index >= 8 and/or pH>=7, and these conditions are easily satisfied by hot water heating and temperature rise, a heat exchanger outlet temperature for maintaining hot water quality in the exchanger at the formula of the stability index < 8 can be calculated, by detecting the Langelier index and/or the stability index and/or detection of a pH by the sensor 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner for heating a heat exchanger, a water supply passage for guiding water to the heat exchanger, a heat exchanger, and a method for guiding hot water heated by the heat exchanger to a hot water tap. The present invention relates to a water heater comprising a hot water supply path, a hot water temperature sensor provided in the hot water path, a combustion amount controller for adjusting the combustion amount of the burner, and a temperature setting device for setting the hot water temperature.

[0002]

2. Description of the Related Art Conventionally, in a water heater, the amount of combustion is controlled by a tapping temperature detected by a tapping temperature sensor and a set temperature set by a temperature setting device. In this case, the maximum temperature at the heat exchanger outlet was possible up to the boiling limit.

[0003]

The conventional water heaters are suitable for use in tap water treated with water by predicting the tendency of calcium carbonate to precipitate, but are not suitable for use with calcium sulfate, calcium carbonate, calcium hydroxide and the like. When used in tap water or well water with water quality in which water is dissolved, the concentration may increase and crystallize due to concentration or heating, and may become scales and adhere to the water supply passage, causing water flow obstruction or heat transfer inhibition.

[0004]

In order to achieve the above object, a first aspect of the present invention is to provide a burner for heating a heat exchanger, a water supply passage for guiding water to the heat exchanger, and a heat exchanger. A hot water supply path for guiding hot water heated by the heat exchanger to a hot water tap, a hot water temperature sensor provided in the hot water supply path, a combustion amount controller for adjusting a combustion amount of the burner, and a temperature for setting a hot water temperature. In a water heater consisting of a setter, a Langeria index (saturation index) determination device is provided in the water supply channel, and temperature control for regulating the maximum temperature at the heat exchanger outlet based on the determination value of the Langeria index is provided. Crystallization of calcium can be suppressed, and water flow disturbance and heat transfer inhibition due to scale formation can be prevented.

[0005] A second aspect of the present invention is a burner for heating the heat exchanger, a water supply path for guiding water supply to the heat exchanger, a heat exchanger, and a water supply path for guiding hot water heated by the heat exchanger to a hot water tap. A hot water temperature sensor provided in the hot water supply path, a combustion amount controller for adjusting the combustion amount of the burner, and a temperature setting device for setting the hot water temperature, a stability index (Rizner index) in the water supply path. ) A judging device is provided, and a temperature control is provided to regulate the maximum temperature at the heat exchanger outlet based on a judgment value based on the stability index (Lisner index). Water damage and heat transfer inhibition can be prevented.

A third aspect of the present invention provides a burner for heating the heat exchanger, a water supply path for guiding water to the heat exchanger, a heat exchanger, and a hot water supply path for guiding hot water heated by the heat exchanger to a hot water tap. And a tap water temperature sensor provided in the hot water supply path, a combustion amount controller for adjusting the combustion amount of the burner, and a water heater including a temperature setting device for setting the tap water temperature, wherein a pH detecting device is provided in the water supply path, A temperature control that regulates the maximum temperature at the heat exchanger outlet according to the detected pH value is provided, so in high-pH water quality with high calcium hardness, crystallization of calcium carbonate due to overheating is suppressed, and water flow obstruction due to scale formation and Heat transfer inhibition can be prevented.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram in which temperature control for regulating the maximum temperature at the outlet of a heat exchanger is applied to a petroleum water supply direct-pressure water heater. As shown in the drawing, the petroleum water supply direct pressure water heater includes a water heater main body 1, a water supply pipe 2 for supplying water from the water supply source to the water heater main body 1, and a large number of water heated by the water heater main body 1. The hot water supply pipe 5 is configured to supply the hot water to the hot water tap 11 via the heating pipe 4 of the heat exchanger 3 composed of fins. Furthermore, it branches off from the water supply pipe 2 in the water heater main body 1,
The hot water heated by the heat exchanger 3 and the bypass pipe 21 are sent to the bypass pipe 21 connected to the hot water supply pipe 5 without passing through the heat exchanger 3, and to the junction of the bypass pipe 21 and the hot water supply pipe 5. A mixing valve 22 is provided for controlling the mixing of the incoming water by a stepping motor M driven based on a command pulse.

The water supply pipe 2 has an incoming water temperature sensor 31 for detecting the temperature Tc of water from the water supply source, a water amount sensor 32 for detecting the amount Q of water, and a water quality analysis sensor for detecting the presence or absence of calcium carbonate. 33, a heat exchanger outlet temperature sensor 34 for detecting the temperature Th at the outlet of the heat exchanger 3 upstream of the mixing valve 22 of the hot water supply pipe 5, and downstream of the mixing valve 22 for mixing after mixing. A mixed hot water temperature detection sensor 35 for detecting the hot water temperature Tm is provided.

FIG. 2 is a determination table for regulating the hot water temperature. The precipitation of calcium carbonate tends to occur under the water quality of Langeria index> 0 and / or stability index ≧ 8 and / or pH ≧ 7, and it is easy to fall into this condition due to an increase in the temperature of hot water. The heat exchanger outlet temperature that maintains the water quality in the heat exchanger at the stability index <8 can be calculated by detecting the Langerial index and / or the stability index and / or the pH.

As described above, the presence or absence of calcium carbonate due to the heating of hot water is determined by the water quality analysis sensor provided in the water supply pipe, the temperature at which scale failure occurs is determined, and the maximum of the heat exchanger outlet temperature and the tap water temperature is determined. By regulating the temperature by control, it is possible to provide a water heater that does not cause scale failure or heat transfer inhibition.

[Brief description of the drawings]

FIG. 1 is a configuration diagram applied to a petroleum water supply direct pressure water heater according to an embodiment of the present invention.

FIG. 2 is a determination table for regulating hot water temperature.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Water heater main body 2 ... Water supply pipe 3 ... Heat exchanger 4 ... Heating pipe 5 ... Hot water supply pipe 11 ... Hot water tap 21 ... By-pass pipe 22 ... Mixing valve 23 ... Stepping motor 31 ... Water temperature sensor 32 ... Water quantity sensor 33 ... Water quality Analysis sensor 34: Heat exchanger outlet temperature sensor 35: Mixed hot water temperature detection sensor 41: Control board 42: Remote control

Claims (3)

[Claims] 1. A burner for heating a heat exchanger, a water supply path for guiding water to the heat exchanger, a heat exchanger, a water supply path for guiding hot water heated by the heat exchanger to a hot water tap, and a hot water supply. In a water heater comprising a tap water temperature sensor provided in a passage, a combustion amount controller for regulating the combustion amount of the burner, and a temperature setting device for setting a tap water temperature, a Langeria index (saturation index) is provided in a water supply path.
A water heater provided with a judging device, and provided with temperature control for regulating the maximum temperature at the heat exchanger outlet with a judgment value of the Langeria index. 2. A burner for heating the heat exchanger, a water supply path for introducing water to the heat exchanger, a heat exchanger, a water supply path for guiding hot water heated by the heat exchanger to a hot water tap, and a hot water supply. In a water heater comprising a tap water temperature sensor provided in a passage, a combustion amount controller for regulating the amount of combustion of the burner, and a temperature setter for setting the tap water temperature, a stability index (Rizner index) is provided in the water supply passage.
A water heater provided with a judging device and having a temperature control for regulating the maximum temperature at the heat exchanger outlet with a judgment value based on a stability index (Rizner index). 3. A burner for heating the heat exchanger, a water supply path for guiding water to the heat exchanger, a heat exchanger, a water supply path for guiding hot water heated by the heat exchanger to a hot water tap, and a hot water supply. In a water heater comprising a tap water temperature sensor provided in a passage, a combustion amount controller for regulating the amount of combustion of the burner, and a temperature setter for setting the tap water temperature, a pH detecting device is provided in the water supply passage, and a detection p
A water heater having a temperature control that regulates a maximum temperature at a heat exchanger outlet according to an H value.