JP2008133993A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To forcibly stop heating without executing usual control, when troubles such as a failure and a runaway occurs in a microcomputer. <P>SOLUTION: This water heater determines a water delivery temperature by a high-temperature water delivery determining means 5 independently of the microcomputer 2, stops the supply of an electric power source to an electric power source part 2 and stops combustion of a gas burner by a combustion stopping means 6, by receiving a signal from the high-temperature water delivery determining means 5, not through the microcomputer 2, when the water delivery temperature is a certain temperature or more. The combustion is stopped thereby to prevent the high temperature water from being delivered, even when a high-temperature water delivery preventive function of the microcomputer is not functioned normally. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water supply device that detects a hot water temperature by a hot water temperature detection means and processes a signal from the hot water temperature detection means by a control means to perform hot water control.

  Conventionally, this type of hot water supply device has a microcomputer as a control means for processing a tapping temperature detection means and a signal from the tapping temperature detection means and performing a tapping control, and if the microcomputer determines that the tapping temperature is abnormal, Prevention control was performed or combustion was stopped (for example, Patent Document 1, Patent Document 2, and Patent Document 3).

FIG. 8 shows a conventional hot water supply system described in Patent Document 1. As shown in FIG. As shown in FIG. 8, the water heater 1 includes a power supply unit 2, a microcomputer 3, a hot water temperature detection means 4, and a combustion stop means 6.
JP-A-11-153356 JP-A-11-153357 Japanese Patent Laid-Open No. 11-132563

  However, in the conventional configuration, the temperature of the hot water detected by the tapping temperature detecting means is judged and controlled by the microcomputer, so that the tapping temperature control function has a problem that the microcomputer is operating normally. Had. In addition, when a trouble such as failure or runaway occurs in the microcomputer, the hot water temperature control function does not operate normally, and the hot water temperature may increase.

  In view of the above-mentioned conventional problems, the problem to be solved by the present invention is to provide a safe water heater that forcibly stops heating instead of normal control when the temperature of the hot water reaches a certain temperature or higher. It is in.

  In order to solve the above-described problems, a water heater of the present invention includes a power source unit of a water heater, a control unit that operates with a power source of the power source unit and controls a heating unit of the water heater, and a hot water outlet of the water heater. Temperature detection means for detecting temperature, high temperature hot water determination means for determining the temperature detected by the temperature detection means independently of the control means, and heating means for the hot water heater by the output of the high temperature hot water determination means The heating stop means receives the output of the high temperature hot water determination means determined that the temperature of the hot water detected by the temperature detection means is higher than a certain temperature. It is configured to stop the heating of the heating means, and can determine the hot water temperature and stop the heating independently of the control means of the hot water heater, and can be a safe hot water heater.

  For example, even if a microcomputer (hereinafter referred to as a microcomputer) used as a control means has a problem such as failure or runaway, and the microcomputer's high-temperature hot water prevention function does not function properly, the hot water heater's heating means are stopped and hot hot water is prevented. can do.

The hot water heater of the present invention has an output of a high temperature hot water determination means that determines that an abnormality has occurred in the control means and that the hot water temperature has become higher than a certain temperature, separately from the control means for controlling the heating means of the water heater. Because the heating stop means stops the heating of the water heater, even if the control means that performs normal control becomes abnormal and becomes uncontrollable, the heating means of the water heater can be stopped from heating and hot hot water can be prevented safely Can provide a hot water heater.

  The first aspect of the invention includes a power supply unit of a water heater, a control unit that operates with a power source of the power supply unit and controls a heating unit of the water heater, and a temperature detection unit that detects a tapping temperature of the water heater, A high temperature hot water determination means for determining the temperature detected by the temperature detection means independently of the control means; and a heating stop means for stopping heating of the heating means of the hot water heater by the output of the high temperature hot water determination means. And the heating stop means receives the output of the high temperature hot water determination means determined that the temperature of the hot water detected by the temperature detection means is higher than a certain temperature, and stops heating of the heating means of the water heater. With the water heater configured, the hot water temperature can be judged and the heating means can be stopped independently of the hot water heater control means, and the heating means of the hot water heater can be stopped and hot hot water hot water can be prevented. Can be a vessel.

  For example, even if a microcomputer (hereinafter referred to as a microcomputer) used as a control means has a trouble such as a failure or runaway and the microcomputer's high-temperature hot water prevention function does not function properly, Can be prevented. Further, when the present embodiment is applied to a gas water heater using gas as a heat source, the hot hot water determination means determines that the hot water hot water determination means determines that the temperature of the hot water detected by the temperature detection means is equal to or higher than a certain temperature. A combustion stop signal is output to the stop means, and the combustion stop means can stop the combustion of the gas burner independently of the control means.

  The second aspect of the invention is a water heater that cuts off the power supply to the power source of the water heater, in particular, with the heating stop means of the first aspect of the invention. In this way, when the high temperature hot water determination means determines that the temperature of the hot water detected by the temperature detection means is higher than a certain temperature, the high temperature hot water determination means outputs a heating stop signal to the heating stop means, and the heating stop means The power supply to the power supply unit of the water heater can be cut off.

  Therefore, for example, it is possible to determine the temperature of the hot water supply of the water heater and stop heating of the heating means independently of the microcomputer used as the control means, causing troubles such as failure or runaway in the microcomputer, and the microcomputer's high temperature hot water prevention function is normal. Even if it does not function properly, it is possible to prevent the heating means of the water heater from stopping heating and hot hot water.

  In addition, when the present embodiment is applied to a gas water heater using gas as a heat source, the high temperature hot water determination means determines that the hot water hot water determination means determines that the temperature of the hot water detected by the temperature detection means is higher than a certain temperature. A combustion stop signal is output to the means, and the combustion stop means shuts off the AC 100V to the power supply unit of the water heater and stops the combustion.

  The third aspect of the invention is a hot water heater that cuts off the power supply to the heat source supply means to the heating means of the hot water heater, in particular, with the heating stop means of the first invention. In this way, when the high temperature hot water determination means determines that the hot water temperature detected by the temperature detection means is equal to or higher than a certain temperature, the high temperature hot water determination means outputs a heating stop signal to the heating stop means, and the heating stop means is a water heater. In order to cut off the power supply to the heat source supply means to the heating means, the operation of the heat source supply means is stopped and the heating of the heating means is stopped.

  Therefore, for example, it is possible to determine the temperature of the hot water supply of the water heater and stop heating of the heating means independently of the microcomputer used as the control means, causing troubles such as failure or runaway in the microcomputer, and the microcomputer's high temperature hot water prevention function is normal. Even if it does not function properly, heating can be stopped and hot hot water can be prevented. Further, since only the power supply to the heat source supply means is cut off, other functions can be made operable.

  Further, when the present embodiment is applied to a gas water heater using gas as a heat source, the high temperature hot water determination means determines that the hot water temperature detected by the temperature detection means is equal to or higher than a certain temperature. A combustion stop signal is output to the combustion stop means, and the combustion stop means can stop the combustion in order to shut off the power supply of the gas valve that is the heat source supply means. Therefore, since only the power supply of the gas valve is shut off, other functions can be made operable.

  The fourth aspect of the invention is a water heater that cuts off the power supply to the heat source supply control means that controls the heat source supply means to the heating means of the water heater, in particular, with the heating stop means of the first invention. In this way, when the high temperature hot water determination means determines that the hot water temperature detected by the temperature detection means is equal to or higher than a certain temperature, the high temperature hot water determination means outputs a heating stop signal to the heating stop means, and the heating stop means Since the power supply of the heat source supply control means for controlling the heat source supply means to the heating means of the water heater is shut off, the heat source supply means cannot be operated, and the heating operation of the heating means of the water heater can be stopped.

  Therefore, for example, it is possible to determine the temperature of the hot water supply of the water heater and stop heating of the heating means independently of the microcomputer used as the control means, causing troubles such as failure or runaway in the microcomputer, and the microcomputer's high temperature hot water prevention function is normal. Even when it does not function, it is possible to prevent the hot water heater from stopping heating and hot hot water. Further, since only the power source of the heat source supply control means for controlling the heat source supply means to the heating means of the water heater is shut off, other functions can be made operable. In addition, the product can be reduced in size and cost.

  Further, when the present embodiment is applied to a gas water heater using gas as a heat source, the high temperature hot water determination means determines that the hot water temperature detected by the temperature detection means is equal to or higher than a certain temperature. A combustion stop signal is output to the combustion stop means, and the combustion stop means shuts off the power supply of the gas valve drive means that is the heat source supply control means, so that the gas valve cannot be driven and combustion can be stopped. Therefore, since only the power supply of the gas valve driving means is shut off, other functions can be made operable.

  The fifth aspect of the invention is particularly the heating stop means of the first aspect of the invention, wherein the heat source supply means for supplying the heat source to the heating means of the water heater is forcibly switched to the supply stop of the heat source by a signal from the control means It is a vessel. Thus, when the high temperature hot water determination means determines that the temperature of the hot water discharged from the water heater detected by the temperature detection means is higher than a certain temperature, the heating stop means that receives the output from the high temperature hot water determination means Since the heat source supply control means that supplies the heat source to the heating means of the water heater by the signal is switched to the supply stop of the heat source, the supply of the heat source of the heat source supply means is stopped and the heating can be stopped.

  Therefore, for example, it is possible to determine the hot water temperature of the water heater independently from the microcomputer used as the control means and stop heating, causing troubles such as malfunction or runaway in the microcomputer, and the high temperature hot water prevention function of the microcomputer functions normally. Even if not, it is possible to prevent the hot water heater from stopping heating and hot hot water. Further, since only the heat source supply signal from the microcomputer to the heat source supply control means is switched to the heat source supply stop side, other functions can be made operable. In addition, further product size reduction and cost reduction can be achieved.

  Further, when the present embodiment is applied to a gas water heater using gas as a heat source, the high temperature hot water determination means determines that the hot water temperature detected by the temperature detection means is equal to or higher than a certain temperature. Since the gas valve driving signal output from the microcomputer is forcibly switched to the valve closing side on the way to the gas valve, the gas valve driving means can close the gas valve and stop the combustion. Therefore, since only the gas valve drive signal from the microcomputer is switched to the valve closing side, other functions can be made operable.

  In particular, the sixth aspect of the present invention provides the water heater according to any one of the first to fifth aspects of the present invention, as long as the state in which the temperature of the hot water supply of the hot water heater reaches or exceeds a certain temperature continues for a certain period of time. It is a water heater configured to stop heating of the heating means. By doing so, when the high temperature hot water determination means determines that the temperature of the hot water detected by the temperature detection means is equal to or higher than a certain temperature, the high temperature hot water determination means outputs a heating stop signal to the timer means. The timer means transmits a heating stop signal to the heating stop means when the heating stop signal continues for a certain period, and the heating stop means stops heating.

  Therefore, for example, it is possible to determine the hot water temperature of the water heater independently from the microcomputer used as the control means and stop heating, causing troubles such as malfunction or runaway in the microcomputer, and the high temperature hot water prevention function of the microcomputer functions normally. Even if not, it is possible to prevent the hot water heater from stopping heating and hot hot water. In addition, the heating stop does not operate unless the hot water supply temperature of the hot water supply temperature exceeds a certain temperature for a certain period of time. can do.

  Further, when the present embodiment is applied to a gas water heater using gas as a heat source, the high temperature hot water determination means determines that the hot water temperature detected by the temperature detection means is equal to or higher than a certain temperature. A combustion stop signal is output to the timer means. The timer means transmits a combustion stop signal to the combustion stop means when the combustion stop signal continues for a certain period, and the combustion stop means stops combustion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment. Further, in the description of the present embodiment, parts having the same configuration and the same operational effects are denoted by the same reference numerals, and redundant description will not be given.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a gas water heater using a gas as a heat source in Embodiment 1 of the present invention. In FIG. 1, there is a water heater 1 using a commercial power source as a power source, and the gas as a heat source supplied as indicated by an arrow through a gas main plug is opened and closed by turning on and off the power source to supply and stop. A gas valve 12 as a heat source supply means, a gas burner 21 as a heating means for combusting the gas supplied through the gas valve 12, and water supply heated by the gas burner 21 and flowing as shown by the arrows in the drawing to heat water for hot water supply A hot water supply heat exchanger 20 to be operated, and a gas valve as heat source supply control means for adjusting the combustion and stop of the gas burner 21 by opening and closing the gas valve 12 and the opening degree of the gas valve 21 to set the hot water temperature of the water heater 1 to a set temperature. Drive means 11.

  In addition, the water heater 1 is connected to a commercial power source, operates with a power source 2 that supplies power necessary to control the water heater 1, and is supplied with power from the power source 2, and the entire water heater 1 is operated. The gas valve driving means 11 adjusts the opening and closing and opening of the gas valve 12, and signals to the gas valve driving means 11 so that the hot water temperature of the water heater 1 becomes the set temperature. Is a microcomputer 3 that performs normal control including a so-called high temperature hot water prevention function and a microcomputer 3 as a control means including its peripheral circuit, and a temperature at which the hot water temperature from the hot water supply heat exchanger 20 is detected and output to the microcomputer 3 A detection means 4, a high temperature hot water determination means 5 that receives the temperature detected by the temperature detection means 4 and determines whether or not this temperature is higher than a certain temperature separately from the microcomputer 3, and a high temperature hot water In judging means 5, there is In response to a combustion stop signal as a heating stop signal output from the high-temperature hot water determination means 5 when it is determined that the temperature is higher than the temperature, it is provided separately from the microcomputer 3 to stop the power supply to the water heater 1 The gas valve 12 is closed to stop the gas supply, and the combustion stop means 6 is provided as a heating stop means for stopping the combustion of the gas burner 21.

Further, the microcomputer 3 controls the hot water temperature based on the tapping temperature detected by the temperature detecting means 4 and the set temperature in normal control, and controls the tapping temperature to the set temperature. In the case of normal control that exhibits the function, it has a function of preventing high temperature hot water.

  About the hot water heater comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. When the water heater 1 performs a hot water supply operation, the microcomputer 3 controls the gas valve 12 via the gas valve driving means 11 according to the hot water temperature detected by the temperature detection means 4 and the set temperature, and burns the gas burner 21 of the water heater 1. And perform normal control so that hot water at the set temperature is discharged. In such normal hot water supply control, when a trouble such as failure or runaway occurs in the microcomputer 3, the normal control of the water heater 1 does not function, and the high temperature hot water prevention function is lost.

  As a result, the high temperature hot water determination means 5 determines whether or not the hot water temperature detected by the temperature detection means 4 is equal to or higher than a certain temperature independently of the microcomputer 3, and if it is determined that the temperature is higher than a certain temperature, In response to the determined signal, independently of the microcomputer 3, the combustion stop means 6 stops the power supply to the power supply unit 2 of the water heater 1 so that the gas valve 12 is closed, and stops the combustion of the gas burner 21.

  As described above, in this embodiment, when the high temperature hot water determination means 5 determines that the temperature of the hot water detected by the temperature detection means 4 is equal to or higher than a certain temperature, the high temperature hot water determination means 5 sends a combustion stop signal to the combustion stop means 6. Because the output is independent of the microcomputer, the temperature of the hot water can be determined and the combustion can be stopped. Even if the microcomputer malfunctions or runs out of control and the microcomputer's high temperature hot water prevention function does not function properly, Stopping and hot hot water can be prevented.

(Embodiment 2)
FIG. 2 shows a configuration diagram of a gas water heater in Embodiment 2 of the present invention. This embodiment is different from the invention of the first embodiment shown in FIG. 1 in that it relates to a specific configuration of the combustion stopping means 6 shown in FIG. 1, and other parts having the same configuration and effects are shown in FIG. The same reference numerals as those in FIG. 1 are assigned and detailed description is omitted, and different portions will be mainly described.

  In FIG. 2, the combustion stop means 6 in FIG. 1 opens and closes a transistor 7 having a base connected to the high temperature hot water determination means 5 and a contact 8 a that is driven by the transistor 7 and provided on the supply line of AC 100V to the power supply unit 2. The relay 8 is configured. Therefore, the transistor 7 turns the relay 8 ON / OFF according to the combustion stop signal from the high temperature hot water determination means 5.

  About the hot water heater comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. When the water heater 1 performs a hot water supply operation, the microcomputer 3 controls the gas valve 12 via the gas valve driving means 11 according to the hot water temperature detected by the temperature detection means 4 and the set temperature, and burns the gas burner 21 of the water heater 1. And perform normal control so that hot water at the set temperature is discharged. In such normal hot water supply control, when a trouble such as failure or runaway occurs in the microcomputer 3, the normal control of the water heater 1 does not function, and the high temperature hot water prevention function is lost.

  As a result, the high temperature hot water determination means 5 determines whether or not the hot water temperature detected by the temperature detection means 4 is not less than a certain temperature independently of the microcomputer 3, and when it is determined that the temperature is higher than a certain temperature. Outputs a combustion stop signal. The transistor 7 is turned on by the combustion stop signal and the relay 8 is energized, and the normally closed contact 8a is opened to cut off the AC 100V to the power supply unit 2. In the water heater 1, since the AC 100V is cut off, the power supply unit 2 stops supplying power to the microcomputer 3, the operation of the gas valve driving means 11 and the gas valve 12 is stopped, the gas valve 12 is closed, and the gas to the gas burner 21 is closed. Supply stops and combustion stops.

As described above, in the present embodiment, when the high temperature hot water determination means 5 determines that the hot water temperature detected by the temperature detection means 4 is equal to or higher than a certain temperature, the high temperature hot water determination means 5 outputs a combustion stop signal to the transistor 7. Since the operation of the hot water heater 1 is stopped by cutting off the supply of AC 100V to the power supply unit 2 by the relay 8, the hot water temperature can be determined and the combustion can be stopped independently of the microcomputer 3. Even if the microcomputer has a trouble such as failure or runaway and the microcomputer's high temperature hot water prevention function does not function normally, the combustion of the gas burner can be stopped and high temperature hot water can be prevented.

  In Embodiment 2 of the present invention, AC 100 V is disconnected by transistor 7 and relay 8, but the same effect as this embodiment can be obtained by other methods as long as AC 100 V can be turned on / off. be able to.

(Embodiment 3)
FIG. 3 shows a configuration diagram of the gas water heater in Embodiment 3 of the present invention. This embodiment is different from the first and second embodiments shown in FIGS. 1 and 2 in that the arrangement position of the combustion stop means 6 shown in FIGS. 1 and 2 is changed. The parts having the effect are denoted by the same reference numerals as those in FIG. 1, and detailed description thereof is omitted.

  In FIG. 3, the combustion stop means 6 is provided between the power supply unit 2 and the gas valve 12, and supplies and stops the power supply to the gas valve 12. The transistor 9 has a base connected to the high temperature hot water determination means 5, The relay 9 is driven by the transistor 9 and opens and closes a contact 10 a provided on the supply line of the power supply unit 2 to the gas valve 12. Therefore, the transistor 9 turns on / off the relay 10 according to the combustion stop signal from the high temperature hot water determination means 5 and turns on / off the power of the gas valve 12 driven by the gas valve driving means 11.

  About the hot water heater comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. When the water heater 1 performs a hot water supply operation, the microcomputer 3 controls the gas valve 12 via the gas valve driving means 11 according to the hot water temperature detected by the temperature detection means 4 and the set temperature, and burns the gas burner 21 of the water heater 1. And perform normal control so that hot water at the set temperature is discharged. In such normal hot water supply control, when a trouble such as failure or runaway occurs in the microcomputer 3, the normal control of the water heater 1 does not function, and the high temperature hot water prevention function is lost.

  As a result, the high temperature hot water determination means 5 determines whether or not the hot water temperature detected by the temperature detection means 4 is not less than a certain temperature independently of the microcomputer 3, and when it is determined that the temperature is higher than a certain temperature. Outputs a combustion stop signal. The transistor 9 is turned on by the combustion stop signal and the relay 10 is energized, and the normally closed contact 10a is opened to cut off the supply of the power supply unit 2 to the gas valve 12. In the water heater 1, since the power supply of the gas valve 12 is cut off, the combustion of the gas burner 21 is stopped by the closed gas valve 12.

  As described above, in the embodiment of the present invention, when the high temperature hot water determination means 5 determines that the hot water temperature detected by the temperature detection means 4 is equal to or higher than a certain temperature, the high temperature hot water determination means 5 sends a combustion stop signal to the transistor 9. Since the combustion of the water heater 1 is stopped when the power to the gas valve 12 is cut off by the relay 10, the hot water temperature can be determined and the combustion can be stopped independently of the microcomputer 3.

  Therefore, even when a trouble such as failure or runaway occurs in the microcomputer and the high temperature hot water prevention function of the microcomputer does not function normally, combustion can be stopped and high temperature hot water can be prevented. Further, since only the power supply of the gas valve 12 is shut off, other functions not related to the gas valve 12 can be made operable.

  In the third embodiment of the present invention, the power supply of the gas valve 12 is shut off by the transistor 9 and the relay 10, but other methods may be used as long as the power supply of the gas valve can be turned on / off. Equivalent effects can be obtained.

(Embodiment 4)
FIG. 4 shows a configuration diagram of a gas water heater in Embodiment 4 of the present invention. This embodiment is different from the first to third embodiments shown in FIGS. 1 to 3 in that the arrangement position of the combustion stop means 6 shown in FIGS. The parts having the effect are denoted by the same reference numerals as those in FIG. 1, and detailed description thereof is omitted.

  In FIG. 4, the combustion stop means 6 is provided between the power supply unit 2 and the gas valve drive means 11 and supplies and stops the power supply to the gas valve drive means 11. The base is connected to the high temperature hot water determination means 5. A transistor 13 and a relay 14 that is driven by the transistor 13 and opens and closes a contact 14 a provided on a supply line of the power supply unit 2 to the gas valve driving means 11. Therefore, the transistor 13 turns on / off the relay 14 by the combustion stop signal from the high temperature hot water determination means 5 and turns on / off the power supply of the gas valve driving means 11.

  About the hot water heater comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. When the water heater 1 performs a hot water supply operation, the microcomputer 3 controls the gas valve 12 via the gas valve driving means 11 according to the hot water temperature detected by the temperature detection means 4 and the set temperature, and burns the gas burner 21 of the water heater 1. And perform normal control so that hot water at the set temperature is discharged. In such normal hot water supply control, when a trouble such as failure or runaway occurs in the microcomputer 3, the normal control of the water heater 1 does not function, and the high temperature hot water prevention function is lost.

  As a result, the high temperature hot water determination means 5 determines whether or not the hot water temperature detected by the temperature detection means 4 is not less than a certain temperature independently of the microcomputer 3, and when it is determined that the temperature is higher than a certain temperature. Outputs a combustion stop signal. The transistor 13 is turned on by the combustion stop signal and the relay 14 is energized, and the normally closed contact 14a is opened to cut off the supply of the power supply unit 2 to the gas valve driving means 11. In the water heater 1, since the power supply of the gas valve driving means 11 is cut off, the gas valve driving means 11 whose control is stopped closes the gas valve 12, the gas supply to the gas burner 21 is cut off, and combustion stops.

  As described above, in the embodiment of the present invention, when the high temperature hot water determination means 5 determines that the hot water temperature detected by the temperature detection means 4 is higher than a certain temperature, the high temperature hot water determination means 5 sends a combustion stop signal to the transistor 13. Since the combustion of the water heater 1 is stopped when the power supply of the gas valve driving means 11 is cut off by the relay 14, the hot water temperature can be determined and the combustion can be stopped independently of the microcomputer. Even when trouble such as failure or runaway occurs and the high temperature hot water prevention function of the microcomputer does not function normally, combustion can be stopped and high temperature hot water can be prevented.

  Further, since only the power supply of the gas valve driving means 11 is cut off, other functions unrelated to the gas valve driving means 11 can be made operable. Further, since the power supply voltage of the gas valve driving means 11 can be configured to be lower than the power supply voltage of the gas valve 12, the transistor 13 and the relay 14 are smaller than the transistor 9 and the relay 10 in the third embodiment of the present invention. And at low cost.

  In the fourth embodiment of the present invention, the power supply of the gas valve driving means 11 is shut off by the transistor 13 and the relay 14, but this method can be used in other methods as long as the power supply of the gas valve driving means can be turned on / off. The same effects as those in the embodiment can be obtained.

(Embodiment 5)
FIG. 5 shows a configuration diagram of the gas water heater in the embodiment of the present invention. The present embodiment is configured to forcibly switch the gas valve driving signal from the microcomputer 3 to the gas valve driving means 11 from the valve opening to the valve closing side by the combustion stop signal of the combustion stopping means 6 shown in FIGS. 1 to 3 in terms of
Unlike the inventions of Embodiments 1 to 4 shown in FIG. 4, parts having the same configuration and operational effects are denoted by the same reference numerals as those in FIG. 1, and detailed description thereof is omitted, and different parts are mainly described. To do.

  In FIG. 5, the combustion stop means 6 is composed of a transistor 15 having a base connected to the high temperature hot water determination means 5 and a resistor 16 connected to the collector of the transistor 15, and the collector is connected to the gas valve driving means 11 of the microcomputer 3. Connected to the control signal line. The combustion stop means 6 forcibly opens the gas valve drive signal from the microcomputer 3 to the gas valve drive means 11 when the transistor 15 is turned on / off by the combustion stop signal from the high temperature hot water determination means 5. It can be switched to the valve side.

  About the hot water heater comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. When the water heater 1 performs a hot water supply operation, the microcomputer 3 controls the gas valve 12 via the gas valve driving means 11 according to the hot water temperature detected by the temperature detection means 4 and the set temperature, and burns the gas burner 21 of the water heater 1. And perform normal control so that hot water at the set temperature is discharged. The gas valve 12 is driven by the gas valve driving means 11 with power from the power supply unit 2.

  In such normal hot water supply control, when a trouble such as failure or runaway occurs in the microcomputer 3, the normal control of the water heater 1 does not function, and the high temperature hot water prevention function is lost.

  As a result, the high temperature hot water determination means 5 determines whether or not the hot water temperature detected by the temperature detection means 4 is not less than a certain temperature independently of the microcomputer 3, and when it is determined that the temperature is higher than a certain temperature. Outputs a combustion stop signal. Upon receiving the combustion stop signal, the transistor 15 of the combustion stop means 6 is turned on by the combustion stop signal, and the gas valve drive signal from the microcomputer 3 to the gas valve drive means 11 is forcibly switched from valve open to valve close. The gas valve driving means 11 shuts off the gas valve 12 because the signal on the valve closing side is inputted. Accordingly, the water heater 1 cannot open the gas valve 12, the gas is shut off, the gas supply to the gas burner 21 is shut off, and the combustion stops.

  As described above, in the embodiment of the present invention, when the high temperature hot water determination means 5 determines that the hot water temperature detected by the temperature detection means 4 is equal to or higher than a certain temperature, the high temperature hot water determination means 5 is a transistor of the combustion stop means 6. The combustion stop signal is output to 15, and the transistor 15 is turned ON / OFF by the combustion stop signal, thereby forcibly switching the gas valve driving signal from the microcomputer 3 to the gas valve driving means 11 from the valve opening to the valve closing side.

  Since the gas valve drive signal is forcibly switched to the valve closing side, the gas valve 12 is shut off and combustion of the water heater 1 is stopped, so that determination of the hot water temperature and stop of combustion are performed independently of the microcomputer. Even if the microcomputer malfunctions or runs out of control and the microcomputer's high temperature hot water prevention function does not function normally, combustion can be stopped and high temperature hot water can be prevented.

  Further, since only the gas valve driving signal to the gas valve driving means 11 is switched from the valve opening side to the valve closing side, other functions unrelated to the gas valve driving means 11 can be made operable.

  Further, it is more preferable to switch the gas valve drive signal from the microcomputer 3 from valve opening to valve closing than turning the power supply voltage of the gas valve 12 ON / OFF or turning the power supply voltage of the gas valve driving means 11 ON / OFF. Since it is small and can be configured easily, it is smaller than the third embodiment of the present invention and the fourth embodiment of the present invention and can be realized at low cost.

  In the fifth embodiment of the present invention, the gas valve drive signal is switched from the valve opening side to the valve closing side by the transistor 15 in the fifth embodiment. However, as long as the gas valve driving signal can be switched from the valve opening side to the valve closing side. Other methods can obtain the same effects as the present embodiment.

  In Embodiment 5 of the present invention, the gas valve drive signal immediately after being output from the microcomputer is switched from the valve opening side to the valve closing side, but the gas valve driving signal is switched to the valve opening side from the microcomputer to the gas valve. ⇒As long as the configuration can be switched to the valve closing side, the same effect as the present embodiment can be obtained by other methods.

(Embodiment 6)
6 and 7 show a configuration diagram of the gas water heater in the embodiment of the present invention. This embodiment is different from the second embodiment of the present invention shown in FIG. 2 in that a timer means 17 is added between the high temperature hot water determination means 5 and the combustion stop means 6 in FIG. In addition, the same reference numerals as those in FIG.

  Further, the present embodiment shown in FIG. 7 differs from the embodiment shown in FIG. 6 in that the timer means 17 of FIG. 6 is configured by a resistor 19 and a capacitor 18, and the other parts having the same configuration and operational effects. The same reference numerals as those in FIG. 6 are attached to the components, and detailed description thereof will be omitted.

  7, the timer means 17 has one end of a resistor 19 connected to the high temperature hot water determination means 5 and the other end connected to the base of the transistor 7 of the combustion stop means 6. Accordingly, the combustion stop signal output from the high temperature hot water determination means 5 is charged to the capacitor 18 via the resistor 19 of the timer means 17 and then input to the transistor 7 of the combustion stop means 6.

  The operation and action of the water heater configured as described above will be described below with reference to FIG. When the water heater 1 performs a hot water supply operation, the microcomputer 3 controls the gas valve 12 via the gas valve driving means 11 according to the hot water temperature detected by the temperature detection means 4 and the set temperature, and burns the gas burner 21 of the water heater 1. And perform normal control so that hot water at the set temperature is discharged. In such normal hot water supply control, when a trouble such as failure or runaway occurs in the microcomputer 3, the normal control of the water heater 1 does not function, and the high temperature hot water prevention function is lost.

  As a result, the high temperature hot water determination means 5 determines whether or not the hot water temperature detected by the temperature detection means 4 is not less than a certain temperature independently of the microcomputer 3, and when it is determined that the temperature is higher than a certain temperature. Outputs a combustion stop signal. The output combustion stop signal is charged to the capacitor 18 via the resistor 19 of the timer means 17 and then input to the transistor 7 of the combustion stop means 6.

  At this time, the time required for charging the capacitor 18 is determined by the resistance value of the resistor 19, the capacity of the capacitor 18, and the voltage of the combustion stop signal. When the combustion stop signal is input, the transistor 7 is turned on and the relay 8 is energized, and the normally closed contact 8a is opened to cut off the AC 100V to the power supply unit 2. In the water heater 1, since the AC 100V is cut off, the power supply unit 2 stops supplying power to the microcomputer 3, the operation of the gas valve driving means 11 and the gas valve 12 is stopped, the gas valve 12 is closed, and the gas to the gas burner 21 is closed. Supply stops and combustion stops.

  As described above, in the embodiment of the present invention, when the high temperature hot water determination means 5 determines that the hot water temperature detected by the temperature detection means 4 is equal to or higher than a certain temperature, the high temperature hot water determination means 5 stops combustion to the transistor 7. Since the water heater is stopped by outputting a signal and AC100V is cut by the relay 8, the hot water temperature can be determined and combustion can be stopped independently of the microcomputer, causing troubles such as failure and runaway in the microcomputer. Even when the microcomputer's high temperature hot water prevention function does not function normally, combustion can be stopped and high temperature hot water can be prevented.

Further, after the combustion stop signal is output, it is delayed by the timer means 17 and input to the transistor 7. Therefore, in order to drive the relay 8 by the transistor 7 and cut off AC100V, the combustion stop signal is delayed by the timer means 17. It is necessary to continue output for as long as possible. Therefore, even if the high temperature hot water determination means 5 temporarily determines that the temperature of the hot water is higher than a certain temperature due to noise or the like, and even if a combustion stop signal is temporarily output, it is shorter than the time delayed by the timer means 17. Thus, since the transistor 7 does not react, it is possible to prevent the water heater 1 from accidentally stopping the combustion.

  Therefore, if the hot water temperature is higher than a certain temperature for a certain period of time, the combustion stop will not be activated, and it will prevent the combustion from stopping due to the high temperature hot water being determined for a moment due to the effects of noise, etc. Can do.

  In the sixth embodiment of the present invention, the transmission of the combustion stop signal is delayed by the resistor 19 and the capacitor 18 as the timer means 17, but other methods may be used as long as the configuration can delay the transmission of the combustion stop signal. The same effect as that of the embodiment can be obtained.

  Further, in the sixth embodiment of the present invention, the timer means 17 is added to the second embodiment of the present invention to prevent the combustion stop due to the instantaneous hot water discharge being determined due to the influence of noise or the like. In the first, third, fourth, and fifth embodiments of the present invention, the timer unit 17 of the present embodiment is provided in the middle from the high-temperature tapping determination unit 5 to the combustion stop unit 6 to implement the present invention. As in Form 6, if the hot water temperature is higher than a certain temperature for a certain period of time, the combustion stop does not operate, and the combustion is stopped due to the determination of hot hot water for a moment due to the influence of noise or the like. Can be prevented.

  In each of the above embodiments of the present invention, a gas water heater using gas as a heat source has been described as an example. However, the present invention may be applied to a water heater using electricity as a heat source and a heat pump type water heater as a heat source. It is possible to expect the same effect as that of the form.

  As described above, the hot water heater of the present invention has a high temperature that is determined to be higher than a certain temperature due to an abnormality in the control means, separately from the control means for controlling the heating means of the hot water heater. Since the heating stop means stops the heating of the water heater by the output of the hot water determination means, even if the control means that performs normal control becomes abnormal and becomes uncontrollable, the heating stop of the heating means of the hot water heater and the high temperature hot water Therefore, the present invention can be applied not only to a water heater using gas and electricity as a heat source, but also to a heat pump type water heater as a heat source.

Configuration diagram of a water heater in Embodiment 1 of the present invention Configuration diagram of a water heater in Embodiment 2 of the present invention The block diagram of the water heater in Embodiment 3 of this invention The block diagram of the water heater in Embodiment 4 of this invention Configuration diagram of a water heater in Embodiment 5 of the present invention The block diagram of the water heater in Embodiment 6 of this invention Another block diagram of the water heater in Embodiment 6 of the present invention Configuration of a conventional water heater

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water heater 2 Power supply part 3 Microcomputer (control means)
4 Temperature detection means 5 High temperature hot water determination means 6 Combustion stop means (heating stop means)
7 Transistor 8 Relay 9 Transistor 10 Relay 11 Gas valve drive means (heat source supply control means)
12 Gas valve (heat source supply means)
13 transistor 14 relay 15 transistor 16 resistor 17 timer means 18 capacitor 19 resistor

Claims (6)

Detected by a power supply unit of the water heater, a control unit that operates with the power source of the power supply unit and controls the heating unit of the water heater, a temperature detection unit that detects a tapping temperature of the water heater, and a temperature detection unit High temperature hot water determination means for determining the temperature independently from the control means, and heating stop means for stopping heating of the heating means of the water heater by the output of the high temperature hot water determination means, the heating stop means Is a water heater configured to stop the heating of the heating means of the water heater in response to the output of the high temperature hot water determination means determined that the temperature of the hot water detected by the temperature detection means is higher than a certain temperature. The hot water heater according to claim 1, wherein the heating stop means interrupts the power supply to the power supply unit of the water heater. The hot water heater according to claim 1, wherein the heating stop means shuts off power supply to the heat source supply means to the heating means of the water heater. The hot water heater according to claim 1, wherein the heating stop means shuts off power supply to the heat source supply control means for controlling the heat source supply means to the heating means of the water heater. 2. The water heater according to claim 1, wherein the heating stop means forcibly switches the heat source supply means that supplies the heat source to the heating means of the water heater in response to a signal from the control means to stop the supply of the heat source. The heating stop means is configured to stop the heating of the heating means of the water heater if the state in which the temperature of the hot water supply reaches a certain temperature or more continues for a certain period of time. The water heater described in the section.

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