JPH1089771A - Hot-water supplier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-water supplier which restrains the danger of scalding by reducing the amount of discharged hot-water when a discharged hot-water temperature is higher than an expected value. SOLUTION: Water, introduced from an external source, is heated by a heat exchanger 22 while the temperature of the heated hot-water is detected by a discharging hot-water temperature detector 27 and is sent out of a hot-water discharging port 12. The heating amount in the heat exchanger 22 is controlled so that the temperature, detected by the discharging hot-water temperature detector 27, is kept at a temperature, set by a temperature setting unit 32. A discharging hot-water control valve 28 is provided near the hot-water discharging port 12 and when a detecting temperature, detected by the discharging hot-water temperature detector 27, becomes higher by a predetermined value or more than a set temperature, set by the temperature setting unit 32, the discharging hot-water control valve 28 is closed. Accordingly, the discharging of hot-water, whose temperature is increased to a high temperature abnormally, through the hot-water discharging port 12 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater for use in kitchens, baths, floor heating, and the like.

[0002]

2. Description of the Related Art Conventionally, as hot water heaters, there are known a hot water storage type in which hot water heated to a predetermined temperature is stored and an instantaneous type in which heating by a gas burner is started simultaneously with the start of hot water supply. Hot water storage type hot water heaters store hot water as hot as possible in a tank, and adjust the temperature of the hot water by mixing the hot water from the tank with a mixing tap or the like at the time of use. In many instantaneous water heaters, the amount of heat of the heat exchanger is adjusted so that hot water of a preset temperature is supplied, or water is mixed with the hot water heated by the heat exchanger.

[0003]

However, if the water heater breaks down for some reason, high-temperature hot water may be discharged, and the possibility of burns cannot be ruled out. In general, the temperature of the hot water to be discharged from a hot-water storage water heater is relatively low because of the use of a mixing tap, but the instantaneous water heater can cause a sudden change in the amount of heating due to failure. It cannot be said that there is no. In particular, when using a water heater for a shower, there is a danger of hot water being applied to the whole body, and such danger must be avoided.

The present invention has been made in view of the above circumstances, and has as its object to reduce the risk of burns by reducing the amount of hot water to be discharged when the temperature of the hot water is unexpectedly high. It is to provide a water heater.

[0005]

According to the first aspect of the present invention, there is provided a heat exchanger for heating water introduced from outside and hot water including hot water heated by the heat exchanger. A tap water temperature detector for detecting the temperature of the hot water sent to the outlet, and a temperature setting means for setting the temperature of the hot water sent to the outside;
First control means for controlling the heating amount of water in the heat exchanger so that the temperature of the hot water sent out to the temperature set by the temperature setting means, and the amount of hot water sent out can be adjusted A second hot water discharge control valve and a second water discharge control valve for controlling the hot water discharge control valve so as to reduce the amount of hot water sent out when the temperature detected by the hot water temperature detector becomes higher than the temperature set by the temperature setting means by a predetermined value or more. Control means.

According to the above configuration, the temperature of the hot water to be discharged is detected by the hot water temperature detector, and when the detected temperature detected by the hot water temperature detector becomes higher than the set temperature set by the temperature setting means by a predetermined value or more, an abnormality is detected. Is assumed to have occurred, and the second control means controls the hot water control valve to reduce the amount of hot water to be sent out. Therefore, if hot water having an unexpectedly high temperature is to be discharged, the amount of hot water decreases. Therefore, as a result, the amount of hot water that contacts the user can be reduced, and burns can be suppressed as compared with the case where a large amount of hot water contacts. In addition, the user knows the abnormality of the water heater due to the decrease in the amount of hot water.

According to a second aspect of the present invention, in the first aspect of the present invention, the second control means closes the hot water control valve when the difference between the detected temperature and the set temperature exceeds a predetermined value. To control. In this configuration, if hot water is to be discharged, the hot water is stopped, so that the user does not touch the hot water and the danger of burns can be avoided. Especially in the shower where the whole body is bathed in hot water,
It is very dangerous to take hot water, but safety can be ensured by the configuration of claim 2.

According to a third aspect of the present invention, in the first or second aspect of the present invention, there is provided a water heater main body containing a piping system including the heat exchanger, and a remote control device provided with the temperature setting means. A notifying means for notifying an alarm when a difference between the detected temperature and the set temperature becomes a predetermined value or more is provided in the remote control device. In this configuration, the abnormality of the water heater can be known by the notification means of the remote control device.
According to this notification, it is possible to take measures such as repairing the water heater.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a basic configuration. The water heater described below is an instantaneous gas water heater using a heat exchanger 22 using the gas burner 21 as a heat source, and the gas burner 21 is automatically ignited by passing water. The water heater main body 2 is provided with a water supply port 11 for introducing water supplied by city water or the like, and a hot water outlet 12 for sending out hot water heated in the water heater main body 2, and is provided with fuel gas. A gas inlet 13 for introduction is provided.

The water heater 2 has a heat exchanger 2 for heating water introduced through a water supply port 11 with a gas burner 21.
A flow sensor 23 for measuring the total amount of water flowing from the water supply port 11 and a thermistor for detecting the temperature of water introduced from the outside are provided on a flow path from the water supply port 11 to the heat exchanger 22. And a feedwater temperature detector 24 comprising the same. In addition, on a flow path from the heat exchanger 22 to the hot water outlet 12, a relief valve 25 that is opened when the internal pressure of the piping system inside the water heater main body 2 becomes a predetermined value or more and connects the piping system to the atmosphere, A heating temperature detector 26 comprising a thermistor for detecting the temperature of the hot water heated by the heat exchanger 22,
A tap water temperature detector 27 composed of a thermistor for detecting the temperature of the tap water to be supplied from the tap port 12, and a tap control valve 28 composed of a variable flow valve that adjusts the supply flow rate of the tap water according to a control signal from a microcomputer 20, which will be described later. And are arranged.

Further, the flow sensor 23 and the hot water temperature detector 27 are also connected by a bypass pipe 14, and a bypass valve 29 is disposed in the bypass pipe 14. The tapping control valve 28 is an electromagnetic valve that can adjust the flow rate in a plurality of stages or an electric valve that can continuously adjust the flow rate. As the bypass valve 29, an electromagnetic valve that only opens and closes the flow path is used. In the supply path of the fuel gas to the gas burner 21, there is provided a gas on-off valve 15 comprising an electromagnetic valve for selecting supply or cutoff of the fuel gas according to a control signal from a microcomputer 20, which will be described later.
And a gas variable flow valve 1 comprising an electromagnetic valve for adjusting the flow rate of the fuel gas in a plurality of stages or a motor-operated valve for continuously adjusting the flow rate of the fuel gas in accordance with a control signal from a microcomputer 20 described later.
6 are provided. Although not shown, when the gas on-off valve 15 is opened, an ignition device for igniting the gas burner 21 is started.

As shown in FIG. 2, the tapping control valve 28, the bypass valve 29, the gas switching valve 15, and the gas variable flow valve 16 are controlled by a microcomputer 20 as control means housed in the water heater main body 2. Is done. The microcomputer 20 is connected to the remote controller 3 via a connection line 35.
0 is connected. The remote control device 30 includes an operation switch 31 for instructing the operation of the water heater 1, a temperature setting unit 32 as a temperature setting unit for setting the temperature of the hot water to be sent, a display lamp 33 and a buzzer 34 as an alarm unit, Flow rate detected by flow rate sensor 23 and feedwater temperature detector 2
4. The gas on-off valve 15 and the gas variable flow valve based on the temperatures detected by the heating temperature detector 26 and the tap water temperature detector 27 so that the temperature of the hot water to be sent approaches the hot water supply temperature set by the temperature setting unit 32. 16, the hot water control valve 28 and the bypass valve 29 are controlled.

Here, the gist of the present invention resides in that the tapping control valve 28 is controlled based on the temperature detected by the tapping temperature detector 27. And the detected temperature detected by the tapping temperature detector 27, and when the detected temperature is higher than the set temperature by a predetermined temperature (for example, 15 ° C.) or more, the opening of the tapping control valve 28 is reduced and the tapping port 12 is To reduce the amount of hot water to be sent out. Although it depends on the use of the water heater 1, it is desirable that the tap control valve 28 be fully closed, especially in a use where the user directly touches the delivered hot water like a shower. However, in order to suppress the water hammer phenomenon, it is desirable to control the flow rate to be smaller than in the fully closed state. Therefore, the control mode of the tapping control valve 28 is selected according to the application. In this way, when hot water having a temperature significantly higher than the set temperature is to be sent out from tap hole 12 for some reason, the amount of hot water to be sent out can be reduced to reduce the risk of burns. At this time, the display lamp 33 is turned on and the buzzer 34 is sounded to notify that the water heater 1 is abnormal. As is clear from the above description, the first control means and the second control means are realized by the microcomputer 20.

Next, the operation during operation will be described with reference to FIG. When the operation is started, first, the hot water supply temperature set by the remote control device 30 is read (S1), and the passing flow rate detected by the flow rate sensor 23 is read (S1).
2). If the passing flow rate is equal to or less than the predetermined value (S3), the gas on-off valve 15 is kept closed. On the other hand, when the flow rate detected by the flow rate sensor 23 is equal to or more than the predetermined value, the gas on-off valve 15 is opened and the gas burner 21 is ignited (S4).
The calorie of the gas burner 21 is determined based on the difference between the temperature detected by the water supply temperature detector 23 and the hot water temperature set by the remote controller 30 and the flow rate detected by the flow rate sensor 23, and the gas variable flow rate is determined so that the heat quantity is obtained. The opening of the valve 16 is adjusted (S5). At this time, the amount of heat of the gas burner 21 is set so that the temperature of the hot water detected by the heating temperature detector 26 becomes higher than the hot water supply temperature, and the hot water discharged from the heat exchanger 22 by opening the bypass valve 29. And water inlet 11
The desired hot water temperature is obtained when mixed with the water introduced through. Since the temperature of the hot water to be sent out may not match the hot water supply temperature only by adjusting the gas variable flow valve 16, the gas variable flow valve 16 is adjusted so that the temperature detected by the tapping temperature detector 27 and the hot water supply temperature match. The opening is corrected (S7). Further, when the gas variable flow valve 16 alone cannot cope with the situation, the hot water discharge control valve 28 controls the hot water discharge amount. Thereafter, the flow rate is detected by the flow rate sensor 23 (S8). If the flow rate decreases (S9), the gas burner 21 is extinguished (S10).

However, when the temperature detected by the tapping temperature detector 27 is higher than the temperature set by the temperature setting unit 32 by a predetermined temperature or more (S6), the opening of the tapping control valve 28 is reduced to zero (S11). ). At the same time, the occurrence of an abnormality in the water heater 1 is notified by the display lamp 33 and the buzzer 34 (S12), and the gas burner 21 is extinguished (S10). With the above-described operation, when an abnormality occurs in the water heater 1, the opening amount of the hot water control valve 28 decreases or becomes zero, so that the user can know the abnormality by reducing the amount of hot water. Since the water heater 1 needs to be repaired to eliminate such an abnormality, the repair may be prompted by a visual display.

By the way, in this type of water heater 1, the tap 1
When the discharge of hot water was stopped after discharging 10 liters of 40 ° C. water per minute from 2 to 5 m ahead, 5 minutes from the stop
It is desired that the temperature is kept within ± 3 ° C. with respect to the hot water supply temperature set by the remote control device 30 within minutes.
For example, in the case of washing dishes, the use of hot water is stopped once and the hot water is often reused after a short time. In such a usage form, the temperature of the discharged hot water fluctuates.
If you do not reduce the temperature change when reusing hot water,
A so-called sandwich phenomenon in which hot water and cold water are discharged alternately occurs, giving the user discomfort.

In order to suppress such a sandwich phenomenon, in this embodiment, the time from ignition of the gas burner 21 to opening of the bypass valve 29 is adjusted according to the temperature detected by the heating temperature detector 26. I have to.
That is, since the temperature of the water inside the heat exchanger 22 decreases with the passage of time, the amount of cold water mixed through the bypass pipe 14 is reduced in order to suppress a decrease in the temperature of the hot water sent from the tap hole 12. That is all we need to do. Therefore, by adjusting the timing from the ignition of the gas burner 21 to the opening of the bypass valve 29, the change in the temperature of the hot water sent from the hot water outlet 12 is reduced. At the same time, the tapping control valve 28 is also controlled, and the temperature of the tapping water is suppressed by the gas variable flow valve 16 while the amount of tapping water sent out from the tapping port 12 is reduced. With such a control, even if the tapping and the stoppage are repeated, the fluctuation of the temperature of the tapping water sent out from taphole 12 can be reduced.

In the above embodiment, the display lamp 3
Although the abnormality is reported by the buzzer 3 and the buzzer 34, any one of the optical notification and the acoustic notification may be used, and the notification mode is not limited to the display lamp or the buzzer.

[0019]

According to the first aspect of the present invention, there is provided a heat exchanger for heating water introduced from the outside, and a tapping temperature for detecting the temperature of the hot water sent to the outside including the hot water heated by the heat exchanger. A detector, temperature setting means for setting the temperature of the hot water sent out, and water in the heat exchanger so that the temperature of the hot water sent out has the temperature set by the temperature setting means. First control means for controlling the amount of heating, a tapping control valve capable of adjusting the quantity of hot water sent to the outside, and a temperature detected by the tapping temperature detector higher than a temperature set by the temperature setting means by a predetermined value or more. And a second control means for controlling the tapping control valve so as to reduce the quantity of hot water sent to the outside, wherein the temperature of the tapping water is detected by a tapping temperature detector and set by the temperature setting means. Tapping temperature for the set temperature Out detection temperature detected by the instrument is considered that an abnormality becomes higher than a predetermined value has occurred, the second
Control means controls the hot water control valve to reduce the amount of hot water to be sent to the outside, so if unexpectedly high-temperature hot water is to be discharged, the hot water amount will decrease. There is an advantage that the amount of contact with the user can be reduced, and burns can be suppressed as compared with the case where a large amount of hot water is touched. Moreover, the user knows the abnormality of the water heater due to the decrease in the amount of hot water.

When the difference between the detected temperature and the set temperature exceeds a predetermined value, the second control means controls the hot water control valve to a fully closed state. If so, there is an advantage that the danger of burns can be avoided without the user touching the hot water. Particularly in a shower in which hot water is applied to the whole body, it is very dangerous to take hot water, but this configuration can ensure safety.

According to a third aspect of the present invention, there is provided a water heater main body accommodating a piping system including a heat exchanger, and a remote control device provided with temperature setting means, wherein a difference between the detected temperature and the set temperature is a predetermined value. In the case where the notification means for notifying the alarm is provided in the remote control device, the abnormality of the water heater can be known by the notification means of the remote control device, so that the water heater can be repaired according to the notification. There is an advantage.

[Brief description of the drawings]

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

FIG. 2 is a main part block diagram of the same.

FIG. 3 is an operation explanatory diagram of the above.

[Explanation of symbols]

 2 Hot water supply unit 20 Microcomputer 22 Heat exchanger 27 Hot water temperature detector 28 Hot water control valve 30 Remote control device 32 Temperature setting unit 33 Display lamp 34 Buzzer

Claims (3)

[Claims] 1. A heat exchanger for heating water introduced from the outside, a hot water temperature detector for detecting the temperature of hot water to be sent to the outside including hot water heated by the heat exchanger, and an outlet to the outside Temperature setting means for setting the temperature of the hot water to be supplied, and a first means for controlling a heating amount of the water in the heat exchanger so that the temperature of the hot water sent to the outside becomes the temperature set by the temperature setting means. Control means, a tapping control valve capable of adjusting the quantity of hot water sent to the outside, and a quantity of hot water sent to the outside when the temperature detected by the hot water temperature detector becomes higher than the temperature set by the temperature setting means by a predetermined value or more. And a second control means for controlling the hot water control valve so as to reduce the temperature. 2. The hot water discharge control valve according to claim 1, wherein said second control means controls said hot water control valve to a fully closed state when a difference between said detected temperature and said set temperature becomes a predetermined value or more. Water heater. 3. A water heater main body accommodating a piping system including the heat exchanger, and a remote controller provided with the temperature setting means, wherein a difference between the detected temperature and the set temperature becomes equal to or more than a predetermined value. The water heater according to claim 1 or 2, wherein a notification means for notifying an alarm is provided in the remote control device.