JPH04158163A - Electrical hot water heat - Google Patents

Abstract

PURPOSE:To reduce the cost by a method wherein is sensing of a lack of hot water in a boiler, each of a remained hot water volume sensor and a hot water temperature sensor in the boiler has the same kind of common sensor. CONSTITUTION:The same kind of common temperature sensing sensors 4 composed of thermistors are disposed at a plurality of water level positions including a part near a lower electrical heater 2 within a boiler 1. Since these sensors 4 measure a hot water temperature within the boiler 1, they may be used for a boiling control and a sensing of an amount of remained hot water within the boiler 1. That is, 'a completion of boiling' is judged at a stage in which an output of the lower-most thermistor reaches a predetermined boiling-up temperature, and when an output from each of the terminators 4 is 50 deg.C or lower, it is judged that the water to be heated at that water level is still in 'water' state and then an amount of remained hot water is determined.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electric water heater.

[Conventional technology]

Recently, electric water heaters have been widely used because they are easy to use, energy efficient, and cost effective.

FIG. 2 shows a schematic diagram of the configuration of an example of a conventional electric water heater. 1 is a can body (tank) that constitutes the main body of the electric water heater, 2
is an electric heater disposed inside the can body 1, which takes in low-temperature city water (tap water) W from the bottom of the can body 1, heats it, and supplies hot water from H.

In the can body 1, there is a hot water temperature detection sensor 4 for boiling control to a preset temperature, or a plurality of residual water detectors for detecting the amount of remaining hot water in the can body 1, in the vicinity of the heater 2. Sensors 5 are arranged at a plurality of water level positions within the can body 1.

(Problem to be solved by the invention) However, in the conventional example as described above, two different types of sensors are used to detect the hot water temperature and the amount of remaining hot water, so there is a problem with the component parts. There were many types, and a large number of pieces were required.

The present invention has been made in view of the above-mentioned situation, and an object of the present invention is to provide a means for reducing the types and total number of each type of control detection sensor.

[Means for Solving the 8 Problems] Therefore, in the present invention, regarding the detection of the hot water shortage state in the can of an electric water heater, each sensor for detecting the amount of hot water remaining in the can and for detecting the temperature of hot water in the can is provided. The objective is to be achieved by using common sensors of the same type.

[Effect]

According to the configuration of the present invention as described above, there is only one type of sensor for detecting hot water temperature/residual water inside the electric water heater can, and the total number of sensors is also reduced, which can contribute to cost reduction.

〔Example〕

The present invention will be explained below based on examples.

FIG. 1 shows a schematic diagram of the configuration of an embodiment of the electric water heater according to the present invention (corresponding to FIG. 2 of the conventional example), and the same (equivalent) components as in FIG. It is expressed by the number.

(Configuration) The feature of this embodiment is that the same type of common temperature detection sensor consisting of a thermistor is installed at multiple water level positions (4 on the ward side) including near the electric heater 2 at the bottom in the tank (2 tanks). This is due to the fact that 4 was installed.

(Function) Since these sensors 4 all measure the temperature of hot water in the can body 1, they can be used for both boiling control and detection of the amount of hot water remaining in the can body 1. In other words, "boiling is complete" when the output of the lowest thermistor reaches the predetermined boiling temperature.
and 11, and when the output from each thermistor 4 is less than 50℃, the hot water at that water level or "water" (
Since the amount of hot water remaining can be determined by determining that the temperature is insufficient for hot water supply, the types/total number of sensors can be reduced.

(Other Embodiments) In this embodiment, an example in which a thermistor is used as this type of temperature detection sensor has been described, but it goes without saying that other types of temperature sensors may be used.

〔Effect of the invention〕

As explained above, according to the present invention, since only one type of temperature detection sensor is used instead of the sensor for detecting hot water,
This can contribute to cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of an electric water heater according to the present invention, and FIG. 2 is a diagram corresponding to FIG. 1 of a conventional example. 1... Can body (tank) 2... Heater 4... Hot water temperature detection sensor

Claims (1)

[Claims] An electric water heater characterized in that a common sensor of the same type is used for each sensor for detecting the amount of hot water remaining in the can body and for detecting the temperature of hot water in the can body with respect to detecting a state of running out of hot water in the can body.