JPH07180910A - Electric warm water apparatus - Google Patents

Abstract

PURPOSE:To provide an electric warm water apparatus having a function for easily learn the water temperature of a hot water storage tank at the time of maintenance. CONSTITUTION:A controller 3 has a seething control unit 3a for controlling energization of an electric heater 2 based on a feed water temperature based on an output of a temperature sensor THC and a seething set temperature, and a display control unit 3d for starting an operation by an operation of mode switching means 6. The unit 3d collects detected values of temperature sensors TH1, TH2, TH3, THc upon starting of an operation, supplies the detected temperatures to a display unit 5, and displays the temperatures. In addition to the detected temperatures of the sensors, a stored content, i.e., feed water temperature, etc., of a memory 3b can be displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage type electric water heater provided in a general house or the like.

[0002]

2. Description of the Related Art As an electric water heater installed in a general house, a hot water storage tank having a water supply port at the bottom and a hot water outlet at the top, and an electric heater attached to the bottom of the tank are provided. Generally, the structure is such that the water stored in the hot water storage tank is heated by a heater, and the convection of the water caused by this heating raises the entire water in the tank to the boiling temperature. And the above-mentioned boiling operation is usually configured to be performed in the midnight power energization time zone (11:00 pm to 7:00 am).

Further, in such an electric water heater using the late-night power, in order to smooth the electric power load, the water temperature in the hot water storage tank is detected, and a peak shift calculation based on the detected water temperature value, that is, boiling is performed. The rise completion time is defined as the midnight power energization time end time (7:00 am on the next day), and calculation such as back-calculating the heater energization start time from that time is performed to start the heater energization. An energization control system is adopted in which the energization time starts at 11:00 pm and is moved backward.

[0004]

By the way, in the above-described energization control type electric water heater, in order to check the boiling operation at the time of maintenance, the boiling time and the peak shift time are calculated at the maintenance site. In this case, information such as the current water temperature state in the hot water storage tank and the supplied water temperature is required.

However, such information is not normally displayed on a remote controller or the like, and therefore maintenance workers carry a thermometer to measure the water temperature under the present circumstances. There is a problem that is bad.

In this type of electric water heater, a technique related to the display of information on the boiling operation has already been proposed (for example, Japanese Patent Application Laid-Open No. 1-230954). Is, for example, the hot water temperature, the amount of remaining hot water, the number of days of operation stoppage, etc., and is not a system for displaying the information necessary for the above calculation.

The present invention has been made in view of the above points, and an object thereof is to provide an electric water heater having a function capable of easily knowing the water temperature in a hot water storage tank during maintenance. To do.

[0008]

A structure for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. In the electric water heater of the present invention, a water supply port 1a is provided at the bottom of the hot water outlet. A hot water storage tank 1 having an upper portion 1b, an electric heater 2 arranged at a lower portion of the hot water storage tank 1, and a tank 1
Temperature sensors TH ₁ , TH ₂ , TH for detecting the amount of remaining hot water
₃ and a temperature sensor TH _C that detects the temperature of the water supplied to the tank.
And a display device 5 provided with a water temperature display portion 5b, and a control device 3, which is based on the preset boiling temperature and the feed water temperature based on the output of the temperature sensor TH _C. A boiling operation control section 3a for controlling energization of the electric heater 2 and a display control section 3d are provided, and the display control section 3d starts its operation by operating a mode switching means (changeover switch) 6. Temperature sensor TH ₁ , TH
It is characterized in that the detected values of ₂ , ₂ , TH ₃ and TH _C are collected and supplied to the respective detected temperature display devices 5 for display.

In order to achieve the same purpose, the electric water heater of the present invention has a storage unit 3b in which the controller 3 stores the boiling water temperature and the feed water temperature based on the output of the temperature sensor TH _C.
In addition, the display control unit 3d is configured to perform an operation of supplying and displaying the stored contents of the storage unit 3b to the display device 5 together with the temperatures detected by the temperature sensors.

[0010]

When the mode switching means 6 is operated to enter the maintenance mode, the water temperature detected by each of the temperature sensors TH ₁ , TH ₂ , TH ₃ and TH _C is automatically displayed on the display device 5. It is possible to know the current water temperature state of the hot water storage tank 1.

Further, in the present invention, since the stored contents of the storage section 3b are displayed in addition to the above-mentioned detected water temperatures in the maintenance mode, it is possible to know information such as the water supply water temperature from the display.

[0012]

1 is a block diagram of an embodiment of the present invention. The hot water tank 1 has a water inlet 1a at the bottom and a tap 1 at the top.
b are provided, and an electric heater 2 is attached to the lower portion of the tank 1.

The hot water storage tank 1 is provided with residual hot water sensors (temperature sensors) TH ₁ , TH ₂ and TH ₃ for detecting the amount of hot water stored from the upper portion in units of 50 liters up to 150 liters. Further, a control sensor (temperature sensor) TH _C is arranged in the hot water storage tank 1 in the vicinity of the heater 2, and the detection outputs of these sensors TH _{1 to} TH ₃ , TH _C are used for the boiling operation of the control device 3. It is input to the control unit 3a and the water temperature display control unit 3d, respectively. In addition, the lighting controller 3c includes a residual hot water sensor T
The detection output of H _{1 to} TH ₃ is input.

The boiling operation control section 3a stores the preset boiling temperature set value and the feed water temperature detected value by the control sensor TH _C in the storage section 3b by operating the remote controller 4, and at the same time, stores them. The peak shift is calculated using the temperature, and the start / stop of energization of the electric heater 2 is controlled based on the calculation result. The water supply temperature used for the peak shift calculation is, for example, by detecting the minimum water temperature from the water supply detection values for the past few days,
The water temperature is sequentially stored and updated in the storage unit 3b as a representative value.

On the other hand, the remote controller 4 is provided with a display device 5 and a mode changeover switch 6. The display device 5 is provided with a remaining hot water amount display portion 5a and a water temperature display portion 5b in which lamps L, ... L respectively displaying the remaining amount: 50, 100, 150 liters are arranged, and each lamp L of the remaining hot water amount display portion 5a is The lighting control unit 3c of the previous control device is configured to light each in accordance with a control signal.
The water temperature display unit 5b digitally displays the water temperature, and the control signal for the display is the water temperature display control unit 3 of the control device.
It is supplied from d.

Then, the water temperature display control section 3d starts its operation at the time when the "maintenance mode" is set by the switching operation of the mode changeover switch 6 on the remote controller 4 side. First, each of the temperature sensors TH _{1 to} TH. ₃ , temperature detected values by TH _C are sampled, and the respective detected temperatures and the storage unit 3b
The contents stored in the table, that is, the data regarding the feed water temperature, the boiling set temperature, and the like are sequentially supplied to the display device 5 in the procedure described later.

Next, the operation of the embodiment of the present invention will be described together with the operation of the control device 3. FIG. 2 is a flowchart showing the operation contents of the control device 3. First, when the switching position of the mode selector switch 6 is set to the "normal mode", the control device 3 performs a normal boiling operation. That is, the peak shift calculation is performed in the midnight power energization time period, the energization of the heater 2 is started based on the calculation result, and thereafter, when the water temperature detected by the control sensor TH _C reaches the boiling set temperature. The energization of the heater 2 is stopped.

When the switching operation of the mode changeover switch 6 is performed during maintenance (STA) and the "maintenance mode" is set, the water temperature display control section 3d of the control unit 3 is set.
But the temperature values detected by the temperature sensor TH ₁ ~TH _3, TH _C were collected, to supply in the order of _{TH 1, TH 2, TH 3} , TH C the detected temperature on the display device 5. As a result, the water temperature display section 5b sequentially digitally displays the water temperature at each level of the remaining amount: 50, 100, and 150 liters, the water temperature of the water supplied to the hot water storage tank 1, and the set boiling temperature.

Next, the water temperature display control unit 3d is operated by the storage unit 3d.
Display data based on the feed water temperature and the boiling set temperature stored in b are supplied to the display device 5, and the respective temperatures are displayed on the water temperature display portion 5b. After that, at the time (STB) when the mode changeover switch 6 is changed over, the original "normal mode" is restored.

According to the embodiment of the present invention described above, it is also possible to check the quality of each of the temperature sensors TH _{1 to} TH ₃ and TH _C at the time of maintenance. That is, each sensor TH displayed on the water temperature display portion 5b in the maintenance mode
The detected temperatures of ₁ , TH ₂ and TH ₃ are, for example, [TH ₁ <TH ₂ ] and [TH
_{If the} lower temperature sensor has a higher temperature detection value than the higher level sensor, such as ₁ > TH ₂ <TH ₃ ], the upper level sensor is abnormal. Can be estimated. Further, when the detected temperature value of the control sensor TH _C is, for example, 30 ° C., it can be estimated that the sensor TH _C has an abnormality.

Further, according to the embodiment of the present invention, when the boiling temperature set value is, for example, 80 ° C., each sensor TH ₁ ,
When the display temperature of at least two sensors of TH ₂ and TH ₃ is, for example, 50 ° C., it can be estimated that the boiling operation is abnormal, and the boiling operation control unit 3a can be checked.

Further, when the stored content of the storage unit 3b is displayed on the water temperature display unit 5b, for example, the display value of the supplied water temperature is 30.
It is also possible to check the storage unit 3b such that it can be estimated that the stored contents are abnormal when the temperature is at ° C.

In the above embodiment, the hot water storage tank has three
Although the example in which the present invention is applied to the electric water heater in which the number of remaining hot water sensors is arranged has been described, the present invention can also be applied to an electric water heater in which the number of arranged sensors is one or any other plural number. Of course.

[0024]

As described above, according to the electric water heater of the present invention, only by operating the mode switching means, the water temperature detected by each temperature sensor, the supplied water temperature, etc. are automatically displayed on the display device. Therefore, in order to check the boiling operation at the time of maintenance, when calculating the boiling time etc. on site, the workers can obtain the information necessary for the calculation from the display value of the display device without using a thermometer etc. It can be easily known and its maintainability is improved.

Further, in the electric water heater of the present invention, since the detected values of the respective remaining hot water amount display and control temperature sensors are displayed, it is possible to estimate the quality of each sensor from the mutual relation of the displayed values. There are also advantages.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation contents of the control device 3 of the embodiment.

[Explanation of symbols]

1 Hot water storage tank 1a Water supply port 1b Hot water outlet 2 Electric heater 3 Control device 3a Boiling operation control unit 3b Storage unit 3c Lighting control unit 3d Water temperature display control unit 4 Remote controller 5 Display device 5a Remaining hot water display unit 5b Water temperature display unit 6 mode Changeover switch TH ₁ , TH ₂ , TH ₃ Remaining hot water sensor (temperature sensor) TH _C control sensor (temperature sensor)

Claims (2)

[Claims] 1. A hot water storage tank having a water supply port at the bottom and a hot water outlet at the top, an electric heater arranged at the bottom of the hot water storage tank, and a temperature sensor for detecting the amount of residual hot water disposed in the tank. , A temperature sensor for detecting the supply water temperature of the tank, a display device provided with a water temperature display unit, and a control device, the control device, the preset boiling temperature and the output of the temperature sensor A boiling operation control unit that performs energization control of the electric heater based on the supply water temperature based on it, and a display control unit are provided, and the display control unit starts the operation by operating the mode switching means,
An electric water heater configured to collect detection values of the temperature sensor and supply the detected temperatures to the display device for display. 2. The control device is provided with a storage unit for storing the boiling water temperature and the feed water temperature based on the output of the temperature sensor, and the display control unit, together with the respective detected temperatures of the temperature sensor. The electric water heater according to claim 1, wherein the electric water heater is configured to perform an operation of supplying the stored content of the storage unit to the display device to display the stored content.