JPH05133603A - Water heater - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if you use hot water in a water heater at a high temperature that exceeds a safe predetermined temperature, forget about the high temperature hot water supply and assume that it is the hot water at the predetermined temperature. , Prevent the user from risk of burns. [Structure] The control circuit 3 controls the opening of the water valve 9 and the gas solenoid valve 6 in response to an opening signal from the kitchen shower 1. Then, the heat exchanger 7 is heated by the burner 4, and hot water is supplied from the kitchen shower 1. Then, the control circuit 3 is always set so that the temperature of the hot water supply becomes a safe predetermined temperature. However, when the temperature setter 11 sets a high temperature higher than the predetermined temperature, the control circuit 3 controls the heating by the signal of the temperature sensor S so that the hot water is set to the high temperature, but when the high-temperature hot water supply ends and the plugging signal is received. The high temperature setting is released and the setting is returned to the predetermined temperature.

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 instantaneously heating and supplying hot water by a hot water supply instruction signal.

[0002]

2. Description of the Related Art Conventionally, for example, in a gas water heater shown in FIG. 2, a non-contact type switch 14 provided in a kitchen shower 13 detects a hot water supply start signal by a user's hand, and then a control circuit 15 is provided. When the detection signal is transmitted and the gas solenoid valve 18 for opening and closing the gas passage 17 to the main burner 16 is opened, at the same time, the water valve 21 for opening and closing the water passage 20 to the heat exchanger 19 is opened and the water governor 22 is used. After the flow rate was adjusted, water was supplied to the heat exchanger 19. Then, the main burner 16 burns, and hot water comes out from the kitchen shower 13. Next, when the user adjusts the hot water supply temperature setting unit 23 to set the hot water supply temperature, the hot water supply is speeded up when the same set temperature is repeated and the operation is facilitated. Therefore, the hot water supply temperature can be used next time. It was like this.

[0003]

However, in the above-mentioned structure, the user has set the hot water supply temperature to a high temperature in the hot water supply temperature setting unit 23 at the previous time and used up, and forgets this, and the contactless switch 14 is forgotten. When the hands were brought close to each other and the operation of the appliance was restarted, there was a problem that hot water was suddenly supplied against the expectation of low-temperature hot water supply due to misunderstanding, and hands and the like were damaged by hot water.

The present invention solves the above-mentioned conventional problems, and provides a water heater with high safety when hot water is used due to careless mistakes such as misunderstandings when hot water supply is not performed at a temperature higher than a predetermined temperature.

[0005]

In order to achieve the above object, the first means of the water heater of the present invention is a heat exchanger, a hot water tap for supplying hot water from the heat exchanger, and a hot water tap. The temperature setter that sets the temperature of the hot water discharged from the hot water is used to operate and stop the heating control by the signal by opening and closing the hot water tap, and the control temperature of the heating water of the heat exchanger is always set to a safe predetermined temperature. When the temperature set by the temperature setter is equal to or higher than the predetermined temperature, the control temperature setter resets from the predetermined temperature to the set temperature by the hot water tap signal and closes the cap. A signal is set so as to return to the predetermined temperature.

The second technical means of the present invention is a hot water supply tap for supplying heated water of a heat exchanger, a temperature setting device for hot water supply from the hot water supply tap, and a set temperature of the temperature setting device for the heating water of the heat exchanger. It is provided with a control temperature setter that sets and saves the control temperature and suspends execution of the hot water tap opening and the heat exchanger heating instruction when the set temperature is higher than a predetermined temperature.

[0007]

According to the above-mentioned first means, the present invention is
Even if the set temperature of the setter is set higher than the specified temperature of the control temperature setter, the control temperature setter that received the stop signal due to the plug closure when the hot hot water was stopped last time cancels the set temperature Return to control. Even if the user is inadvertently supplying hot water due to misunderstandings, the hot water is supplied at a safe temperature at the start of the hot water supply, and the risk of damage due to hot water such as hands can be avoided and safety can be ensured.

Further, according to the above-mentioned second means, in the gas water heater of the present invention, when the set temperature of the setting device is higher than the predetermined temperature set in the control temperature setting device, the control temperature setting device opens the hot water tap. Even if the instruction to heat the plug and the heat exchanger is received, execution of the instruction is suspended. When the set temperature is higher than the predetermined temperature, even if the user mistakenly thinks that the set temperature is equal to or lower than the predetermined temperature and supplies hot water by mistake, the high-temperature water supply can provide high safety without damaging hot water to the hands and the like.

[0009]

Embodiments of the gas water heater according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention, in which 1 is a kitchen shower serving as a hot-water tap, provided with a water shutoff valve 1a and a contactless switch 2 serving as a transmitter. When the user brings his or her hand close to the non-contact type switch 2, an operation start signal is transmitted to the control circuit 3 as a control temperature setting device. Reference numeral 4 is a main burner, and a gas passage 5 to the main burner 4 is opened and closed by a gas solenoid valve 6 that controls the flow of gas. Reference numeral 7 denotes a heat exchanger, and a water passage 8 to the heat exchanger 7 is opened / closed by a water valve 9 and a flow rate is adjusted by a water governor 10. The hot water supply passage H of the heat exchanger 7 is provided with a temperature sensor S for detecting the hot water discharge temperature. An operation unit R and the like are electrically connected to the control circuit 3 as indicated by a broken line in the figure. Operating part R
Is a hot water outlet temperature of the heat exchanger 7, a temperature setting device 11 for setting the hot water supply temperature from the kitchen shower 1, and a display device 12 for displaying the set temperature of the temperature setting device 11 and the temperature detected by the temperature sensor S. , A power switch D is provided.

Based on the above configuration, the hot water supply at a predetermined temperature preset in the control circuit 3 will be described below. This predetermined temperature is a relatively low temperature of about 40 ° C., which is the most frequently used temperature in the kitchen, and a temperature at which there is no risk of burns is set.
Then, turn on the power switch D to turn on the kitchen shower 1.
When a hand, tableware or the like is brought closer to the lower part of the contactless type, the non-contact type switch 2 oscillates infrared rays or the like to detect a driving start signal due to approach of the hand, tableware or the like, and transmits the detection signal to the control circuit 3.
The control circuit 3 opens the water shutoff valve 1a in response to the detection signal, opens the gas electromagnetic valve 6 and causes the main burner 4 to heat the heat exchanger 7. The water valve 9 of the water supply passage 8 is also opened, and the passing water of the heat exchanger 7 is heated and controlled to a predetermined temperature set in advance by the detection signal of the temperature sensor S, and hot water is supplied from the kitchen shower 1. This hot water supply is quicker than the hot water supply of other set temperatures without the need for temperature setting operation, and is superior in usability because it has multiple versatility. When the required amount of hot water supply is reached, the hands, dishes and the like are moved away from the kitchen shower 1 by a predetermined distance, the switch 2 detects this and oscillates a stop signal, and the control circuit 3 closes the gas solenoid valve 6 and the water valve 9. And stop driving. At this time, the water shutoff valve 1a is also closed to prevent hot water in the hot water supply passage H from dripping through the water shutoff valve 1a. The power switch D is turned on during the hot water use period during the daytime, and is turned off in order to prevent malfunction when doing other work near the kitchen shower 1 except for the non-use time period at night and the purpose other than hot water supply. To do. Then, this ON state is displayed on the display 12, and the display 1
2 also displays that it is set to a predetermined temperature.

When it is desired to supply hot water at a temperature lower than a predetermined temperature, the temperature is first set by the temperature setting device 11 and a start signal is input to the kitchen shower 1. At this time, since there is no risk of burns, the control circuit 3 resets the predetermined temperature to the set temperature and supplies hot water at the set temperature from the beginning. However, since the hot water supply temperature is frequently used, when the kitchen shower 1 outputs a stop signal, the control circuit 3 resets the set temperature to a predetermined temperature. However, in order to enable re-hot water supply at the same set temperature only once again, a timer (not shown) for holding the reset for a predetermined short time operates in the control circuit 3 after the stop signal is received. There is. If you want to reset the timer, enter a short start signal twice, that is, one extra hand or dish in the kitchen shower 1
It is good to work in perspective.

Next, when it is desired to supply hot water at a temperature higher than a predetermined temperature, first, hot water supply is started in the same manner as when supplying hot water at a predetermined temperature. Next, when a desired high temperature is set and input to the temperature setter 11, the control circuit 3 resets the predetermined temperature to the high set temperature, and the gas detected so that the temperature detected by the temperature sensor S matches the reset high temperature. The solenoid valve 6 is controlled, and the heat exchanger 7 is heated by the main burner 4. When the desired amount of hot water has been supplied, the contactless switch 2 outputs a stop signal, and the control circuit 3 that has received this stop signal resets the high set temperature to a predetermined temperature and the hot water supply is stopped. At this time, the gas solenoid valve 5 is immediately closed, but the water valve 9 and the water shutoff valve 1a are delayed until the temperature sensor S detects a predetermined temperature, so that the hot water supply at the next predetermined temperature is performed within a short time. There are preparatory actions that can be performed safely. Of course, the waiting time by the timer is not set. By setting the reset operation and the preparatory operation, damage due to hot water such as hands due to careless mistakes such as misunderstanding can be safely prevented. Display 12
Indicates so that the preparatory operation is not misunderstood as a failure due to poor water shutoff of the water shutoff valve 1a. If the set temperature set to a high temperature is stored in the control circuit 3 before the input of the start signal and the hot water supply at the predetermined temperature is started and the predetermined temperature is automatically reset to the high set temperature, the hot water supply temperature is rapidly increased. Since it does not heat up, it can prevent burns. At this time, the display 12 notifies the automatic reset to the high temperature, and also notifies the temperature change to the high temperature in addition to the feel of the temperature of the hand.

In addition to the above-mentioned embodiment, the transmitter for inputting / outputting the driving start signal and the driving stop signal may be a voice receiver or a manually input switch. In addition, a switch or setting circuit for varying the predetermined temperature is provided in the operation unit R and the control circuit 3 in consideration of the fact that the hot water supply place is changed from the kitchen to the washroom or shower room, and the seasonal hot water supply temperature is optimized. Equipped with
Further, the usability may be improved. In order to simplify the structure of the equipment, when the set temperature is higher than the predetermined temperature,
When the temperature detected by the temperature sensor S is higher than the predetermined temperature, it is possible to simply notify the display device 12 of that fact and suspend the hot water supply operation.

[0015]

As described above, in the water heater of the present invention, even if the set temperature of the setting device is set higher than the predetermined temperature of the control temperature setting device, the transmitter is stopped when the use of the hot water supply is stopped last time. When the control temperature setter that receives the signal cancels the high temperature and dangerous preset temperature in advance and resets it to the predetermined temperature, even if you make a mistake and start hot water supply accidentally, first perform hot water supply at the predetermined temperature Safety can be ensured by avoiding the risk of hot water damage.

According to the second aspect of the present invention, when the hot water supply set temperature of the temperature setting device is higher than the predetermined temperature of the control temperature setting device, an instruction is issued even if the control temperature setting device receives an instruction to open the hot water tap and heat the heat exchanger. Even if you mistakenly think that the set temperature is equal to or lower than the predetermined temperature and supply hot water accidentally, hot water damage to your hands etc. can be prevented and hot water supply can be provided safely.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a gas water heater of the present invention.

FIG. 2 is a configuration diagram of a conventional gas water heater.

[Explanation of symbols]

 1 Kitchen shower 2 Switch (oscillator) 3 Control circuit 11 Temperature setting device

Claims (2)

[Claims] 1. A heat exchanger, a hot water supply tap for supplying hot water from the heat exchanger, a temperature setting device for setting the temperature of hot water discharged from the hot water supply tap, and heating by a signal by opening and closing the hot water supply tap. It is equipped with a control temperature setter that operates and stops the control and always sets the control temperature of the heating water of the heat exchanger to a safe predetermined temperature. When the temperature is equal to or higher than the predetermined temperature, the water heater is set to reset from a predetermined temperature to a set temperature by a hot water tap signal and to return to the predetermined temperature by a closed signal. 2. A hot-water tap for supplying heated water of a heat exchanger, a temperature setting device for supplying hot water from the hot-water tap, and a set temperature of the temperature setting device set to a control temperature of the heated water of the heat exchanger and stored. However, when the set temperature is higher than a predetermined temperature, a water heater equipped with a control temperature setting device that suspends the opening of the hot water tap and the execution of the heating instruction of the heat exchanger.