JP2012013394A - Hot water supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute the detection and immediate combustion stop when dry-burning of a hot water supply heat exchanger and a bath reheating heat exchanger occurs.SOLUTION: A hot water supply apparatus provides a bath high limit switch 46 and a hot water supply high limit switch 47 in series between an electromagnetic valve 54 provided in a gas supply passage to a burner and the power source 1, and is composed to close the electromagnetic valve 54 when outputting off signals from at least one switches 46, 47. The hot water supply apparatus takes answer signals of the first switch 46 of the side near to the power source 1 and answer signals of the second switch 47 of the side far from the power source 1 in an answer signal receiving circuit 5 through individual signal transmission routes A, B respectively. The hot water supply apparatus provides a time constant circuit 4 composed of a capacitor C1 and a resistor Rt in the signal transmission route A of the first switch 46. The answer signal receiving circuit 5 discriminates a case in which the answer signals are output from the first switch 46 and a case in which the answer signals are output from the second switch 47 from each other.

Description

  The present invention relates to a bath hot water supply apparatus including a bath main burner and a hot water supply main burner that perform gas combustion, and a heat exchanger heated by these burners.

  As shown in FIG. 7, for example, as shown in FIG. 7, a high limit switch 71 and a thermal fuse 72 for detecting the emptying of the heat exchanger 78 are provided on a heat exchanger 78 heated by a burner 74 as a heat exchanger for preventing air blowing. The provided structure is proposed (for example, refer patent document 1). In the figure, a conduit 73 for supplying gas to a burner 74 is provided with solenoid valves 76 and 79. When the heat exchanger 78 is blown, the high limit switch 71 and the thermal fuse 72 are turned off. The signal is received by the central processing unit 75, and the central processing unit 75 drives the valve drive unit 77 to close the electromagnetic valves 76 and 79, thereby preventing the heat exchanger 78 from being blown.

Japanese Examined Patent Publication No. 4-51733

  However, in the apparatus as shown in FIG. 7, when the high limit switch 71 detects the emptying of the heat exchanger 78, the off signal is received by the central processing unit, and the central processing unit 75 receives the valve drive unit 77. Since the solenoid valve 76 and 79 are closed by driving the central processing unit 75, even when the high limit switch 71 detects the emptying of the heat exchanger 78, There was a problem that the air heating of the heat exchanger 78 would continue without the electromagnetic valves 76 and 79 being closed.

  Moreover, in the bath water heater, a heat exchanger heated by the bath main burner and a heat exchanger heated by the hot water main burner are provided. In that case, a high limit switch is provided for each heat exchanger. If it is not possible to individually detect which off-limit signal was output from which high limit switch, measures should be taken to prevent the main burner from burning according to the number of outputs. There was a risk that the life of the heat exchanger on the bath side could be shortened.

  The present invention has been made in order to solve the above-described conventional problems, and the object thereof is to immediately stop the combustion when hot air of the heat exchanger occurs and to supply hot water. An object of the present invention is to provide a bath water heater capable of individually detecting and coping with the number of times of emptying of an exchanger and a bath-heating heat exchanger.

  In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the first invention includes a hot water supply main burner, a hot water supply heat exchanger heated by the hot water supply main burner, a bath main burner, a bath reheating heat exchanger heated by the bath main burner, and the hot water supply. The gas supply passage for supplying fuel gas to the main burner and the bath main burner, the solenoid valve provided in the gas supply passage, and the temperature of the hot water supply heat exchanger have exceeded a predetermined setting temperature for detection of airing A hot water supply air blow prevention switch that sometimes outputs an off signal as an answer signal, and an off signal is outputted as an answer signal when the temperature of the bath reheating heat exchanger exceeds a predetermined temperature setting for air blow detection An energizing circuit is provided for connecting the solenoid valve and a power source for supplying a current to the solenoid valve. The hot water emptying prevention switch and the bath emptying prevention switch are provided in series between the valve and an off signal is output from at least one of the bath emptying prevention switch and the hot water supply emptying prevention switch. When this is done, the solenoid valve is configured to close, and the answering signal of the first switch provided on the side closer to the power source of the hot water supply emptying prevention switch and the bath emptying prevention switch is far from the power source. Signal receiving circuit that takes in the answer signal of the second switch provided on the side through each individual signal transmission path, and signal transmission for transmitting the answer signal of the first switch to the answer signal receiving circuit The path is provided with a time constant circuit composed of a capacitor and a resistor, and when the off signal is output from the first switch and the second And if the OFF signal from the switch is output with the configuration form distinguishing configuration the answer signal receiving circuit has a means for solving the problems.

  According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the energization circuit has a resistance instead of a time constant circuit provided in the signal transmission path for transmitting the answer signal of the first switch to the answer signal receiving circuit. The answer signal receiving circuit is configured to distinguish at least a case where an off signal is output from the first switch and a case where an off signal is output only from the second switch. It is characterized by being.

  Further, in the third invention, in addition to the configuration of the first or second invention, the energization circuit includes a temperature fuse of a hot water heat exchanger and a bath reheating heat exchanger between a power source and an electromagnetic valve. A series fuse circuit with a thermal fuse is provided in series.

  Furthermore, in the fourth aspect of the invention, in addition to the configuration of the third aspect of the invention, the hot water emptying prevention switch, the hot bath emptying prevention switch, and the hot air emptying prevention switch of the series fuse circuit in the energization circuit include: It is provided on the side closest to the power supply.

  Further, in a fifth aspect of the invention, in addition to the configuration of the third or fourth aspect of the invention, a series fuse circuit is provided between the second switch of the energizing circuit and the electromagnetic valve, and the second switch A transistor and a resistor are interposed between the electromagnetic valve and the solenoid valve, and a signal transmission path is provided to transmit a disconnection signal of the thermal fuse of the series fuse circuit to the answer signal reception circuit. The voltage obtained by dividing the power supply voltage by the resistor and the resistor built in the solenoid valve is transmitted when the thermal fuse is not disconnected, and the power supply voltage is transmitted when the thermal fuse is disconnected. Features.

  Further, the sixth invention includes a hot water supply main burner, a hot water supply heat exchanger heated by the hot water supply main burner, a bath main burner, a bath reheating heat exchanger heated by the bath main burner, and the hot water supply. The gas supply passage for supplying fuel gas to the main burner and the bath main burner, the solenoid valve provided in the gas supply passage, and the temperature of the hot water supply heat exchanger have exceeded a predetermined setting temperature for detection of airing A hot water supply air blow prevention switch that sometimes outputs an off signal as an answer signal, and an off signal is outputted as an answer signal when the temperature of the bath reheating heat exchanger exceeds a predetermined temperature setting for air blow detection An energization circuit that connects the solenoid valve and a power source for supplying a current to the solenoid valve is formed. Between the magnetic valve, a switch on one side of the hot water emptying prevention switch and the bath emptying prevention switch is provided in series, and when the off signal is output from the switch, the electromagnetic valve An answer signal receiving circuit is provided that takes in the answer signal of the switch on one side via the first signal transmission path, and further includes a hot water supply air prevention switch and the bath air supply. The answer signal receiving circuit for taking in the answer signal of the switch on the other side of the prevention switch via the second signal transmission path is provided as means for solving the problem.

  Further, in the seventh invention, in addition to the configuration of the sixth invention, the energizing circuit includes a temperature fuse of a hot water heat exchanger and a temperature fuse of a bath reheating heat exchanger between a power source and an electromagnetic valve. A series fuse circuit is provided in series as means for solving the problem.

  Furthermore, in addition to the configuration of the sixth aspect of the invention, the switch provided between the power source of the energization circuit and the solenoid valve is a bath empty switch, and the eighth aspect of the invention provides the bath empty switch, A series fuse circuit of a temperature fuse of a hot water supply heat exchanger and a temperature fuse of a bath reheating heat exchanger is provided in series, and the bath emptying switch is provided closer to the power source than the series fuse circuit It is characterized by being.

  Furthermore, the ninth aspect of the invention is that, in addition to the configuration of any one of the first to eighth aspects of the invention, when the off signal from the bath emptying prevention switch is output more than a predetermined number of times, Combustion compulsory prohibiting means for forcibly preventing combustion of the main burner is provided.

  Furthermore, the tenth invention has a pilot burner for igniting the hot water supply main burner and the bath main burner in addition to the configuration of any one of the first to eighth inventions, and a bath emptying prevention switch Combustion compulsory prohibiting means is provided for forcibly preventing all combustion of the bath main burner, hot water supply main burner, and pilot burner when the OFF signal from is output more than a predetermined number of times. It is characterized by that.

  Furthermore, in addition to the structure of the tenth invention, the eleventh invention enables combustion of the hot water supply main burner when the bath emptying prevention switch outputs an on signal after the off signal has been output a set number of times or more. It is characterized by that.

  Further, the twelfth aspect of the present invention is to prevent the hot air from flowing into the bath when the burner is not forcibly burned by the combustion forbidden prohibiting means in addition to the structure of the ninth, tenth or eleventh aspects of the invention. An informing means for informing that combustion is forbidden is provided.

  In the present invention, a hot water heat exchanger is connected between a power source and an electromagnetic valve of an energization circuit that connects an electromagnetic valve provided in a gas supply passage for supplying gas to the burner and a power source for supplying current to the electromagnetic valve. A hot water supply air blow prevention switch that outputs an off signal as an answer signal when the temperature exceeds a predetermined air blow detection setting temperature, and the air blow detection heat exchanger temperature is set in advance. A bath emptying prevention switch that outputs an OFF signal as an answer signal when the temperature is exceeded is provided in series, and when the OFF signal is output from at least one of the bath emptying prevention switch and the hot water supply emptying prevention switch, the electromagnetic By configuring the valve to be closed, the burner combustion is stopped immediately by closing the solenoid valve in the event of either hot water supply heat exchanger or bath reheating heat exchanger. Can be, the safety of the bath water heater can be very high.

  Further, in the configuration in which the hot water emptying prevention switch and the bath emptying prevention switch are provided in series in the energization circuit, the hot water supply emptying prevention switch and the bath emptying prevention switch are provided on the side closer to the power source. The answer signal of the first switch and the answer signal of the second switch provided on the side far from the power source are respectively captured by the answer signal receiving circuit via the individual signal transmission paths. By providing a time constant circuit composed of a capacitor and a resistor in the signal transmission path for transmitting the answer signal of the switch, when the off signal is output from the first switch and when the off signal is output from the second switch The answer signal receiving circuit can distinguish the output case. Therefore, it is possible to individually detect and cope with the number of times that the hot water supply heat exchanger and the bath reheating heat exchanger are idle and the output timing of the off signal.

  In addition, a resistor is provided in the signal transmission path for transmitting the answer signal of the first switch instead of providing a time constant circuit, and the answer signal receiving circuit outputs at least an off signal from the first switch. By distinguishing from the case where an off signal is output only from the other switch, only the heat exchanger on the side where the second switch is provided among the hot water supply heat exchanger and the bath reheating heat exchanger is operated. Alternatively, it is possible to distinguish between the heat exchanger on the side where the first switch is provided or whether the heat exchangers of both the heat exchangers are open and detect the number of times to cope with it.

  Further, in the energization circuit, a series fuse circuit of the temperature fuse of the hot water heat exchanger and the temperature fuse of the bath reheating heat exchanger is provided in series between the power source and the solenoid valve, so that the hot water heat exchanger or bath If the temperature of the reheating heat exchanger becomes too high, the series fuse circuit is opened (disconnected), the power supply from the power source to the solenoid valve is cut off, and the solenoid valve is closed, so that safety can be further improved. Then, by providing the hot water hot air prevention switch, the hot air bath prevention switch and the series fuse circuit on the side closest to the power supply, the hot air hot air prevention switch is activated. The number of outputs) can be detected and grasped by the answer signal receiving circuit.

  Furthermore, between the second switch and the solenoid valve, a series fuse circuit of the temperature fuse of the hot water heat exchanger and the temperature fuse of the bath reheating heat exchanger, a transistor and a resistor are interposed, and the temperature fuse By providing a signal transmission path for transmitting the disconnection signal to the answer signal receiving circuit, the disconnection of the thermal fuse can be detected separately from the output detection of the off signal from the first and second switches.

  Furthermore, in the present invention, hot water supply heat exchange is performed between the power supply and the solenoid valve of the energization circuit that connects the solenoid valve provided in the gas supply passage for supplying gas to the burner and the power supply for supplying current to the solenoid valve. Hot water hot air blow prevention switch that outputs an off signal as an answer signal when the temperature of the hot water heater exceeds a predetermined temperature setting for hot air detection, and hot air detection that the temperature of the bath reheating heat exchanger is predetermined By providing either switch of the bath emptying prevention switch that outputs an off signal as an answer signal when the set temperature exceeds the set temperature, the heat exchanger provided with the switch is set to the detection temperature for emptying detection. When the value exceeds the value, an off signal is output, the solenoid valve is immediately closed, burner combustion can be stopped, and the heat exchanger can be prevented from being blown.

  Also, an answer signal receiving circuit that takes in the answer signal of one side of the hot water supply emptying prevention switch and the bath empty prevention switch via the first signal transmission path, and the answer signal of the other side switch as the second signal By providing an answer signal receiving circuit that takes in via the transmission path, it is possible to individually detect and deal with the number of times that the hot water supply heat exchanger and the bath reheating heat exchanger are blown. The answer signal receiving circuit that receives the answer signal of the switch on one side and the answer signal receiving circuit that receives the answer signal of a switch different from the switch on the other side may be the same circuit as long as the answer signal can be detected individually. It is good also as a separate circuit.

  Furthermore, even in the configuration in which the switch on one side of the hot water hot air prevention switch and the bath empty hot water prevention switch is provided in the energization circuit, the temperature fuse of the hot water heat exchanger and the bath reheating heat exchanger are between the power source and the solenoid valve. By providing a series fuse circuit in series with the temperature fuse, the series fuse circuit will open and the power supply to the solenoid valve will be cut off if the temperature of the hot water supply heat exchanger or bath heating heat exchanger becomes too high. Since the solenoid valve is closed, safety can be further improved. Then, an energizing circuit is provided with a bath emptying prevention switch, and the bath emptying prevention switch is provided closer to the power supply than the series fuse circuit. It can be detected and grasped by the signal receiving circuit.

  Further, when the OFF signal from the bath emptying prevention switch is output for a predetermined number of times or more, the combustion forbidden means for preventing the bath main burner from being forced, By forcing all combustion of the burner, hot water supply main burner, and pilot burner not to be performed, the user is given an opportunity to be careful not to blow up the bath and heat exchanger. it can. In other words, if the burner cannot be burned as described above, the user will be able to investigate the cause and be encouraged to grasp that there is a lot of airing and to be cautious. It is possible to prevent the heat exchanger from being damaged by repeating the air blowing.

  Also, in a configuration in which combustion of all burners cannot be forcibly performed, the hot water supply main burner can be combusted when an on signal is output after the bath emptying prevention switch outputs an off signal more than a set number of times. As a result, the heat exchanger can be prevented from being damaged by repeating the air heating of the bath chase heat exchanger, and the usability can be improved.

  Furthermore, when the combustion forbidden means forcibly prohibits burning of the burner, by notifying the user that the combustion is forbidden for preventing the bath from being blown, You can inform them that there was a lot and encourage them to be careful not to blow the bath.

It is a figure which shows typically the structure of the electricity supply circuit provided in one Example of the bath hot-water supply apparatus which concerns on this invention. It is a graph which shows the example of the answer signal detected by the electricity supply circuit shown in FIG. It is explanatory drawing which shows the system structural example of a bath hot-water supply apparatus typically. It is a figure which shows another example of the electricity supply circuit applied to an Example. It is a graph which shows the example of the answer signal detected by the electricity supply circuit shown in FIG. It is a figure which shows typically the structural example of the electricity supply circuit provided in the bath hot-water supply apparatus of the other Example. It is a figure for demonstrating the structure which prevents the air blowing proposed conventionally.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the present embodiment, the same reference numerals are assigned to the same names as those in the conventional example, and the duplicate description is omitted or simplified.

  The bath hot-water supply apparatus of a present Example has the system configuration shown in FIG. 3, and has the characteristic control configuration shown in FIG. Hereinafter, based on FIG. 3, the system configuration | structure of the bath hot-water supply apparatus of a present Example is demonstrated. This device is a device called a balance bath placed in a bathroom, for example. In the figure, a bath reheating heat exchanger 40 heated by the bath main burner 39 is provided on the upper side of a bath main burner 39 for reheating the bath. A bath high limit switch 46 is provided. A hot water supply heat exchanger 7 heated by the hot water supply main burner 10 is provided on the upper side of the hot water supply main burner 10, and a hot water supply high limit switch 47 is provided on the outlet side of the hot water supply heat exchanger 7. Yes. On the upper side of the hot water supply heat exchanger 7 and the bath reheating heat exchanger 40, combustion gas exhaust ports 17 of the hot water supply main burner 10 and the bath main burner 39 are provided.

  Connected to the hot water supply heat exchanger 7 are a water supply introduction passage 19 for introducing water into the hot water supply heat exchanger 7 and a hot water supply passage 11 for guiding water heated through the hot water supply heat exchanger 7 to a hot water supply destination. Yes. A hot-water tap 9 is provided at the distal end side of the hot-water supply passage 11. In this example, the hot-water tap 9 is formed of a switching lever type plug. This type of hot water tap 9 selectively switches hot water that has passed through the hot water supply passage 11 from either the hot water discharge pipe 30 side of the currant side or the shower side passage 31 by switching the lever. A state where the hot water is selected from the side of the hot water discharge pipe 30 is shown. Reference numeral 57 denotes a check valve, and 58 denotes a hot water cutoff valve.

  A water amount adjusting mechanism 21 is connected to the water supply introduction passage 19, and the water amount adjusting mechanism 21 is provided with a water governor 15, a diaphragm case 13, and a water amount adjusting chamber 20. The diaphragm case 13 is provided with a diaphragm 14, and the diaphragm 14 divides the inside of the diaphragm case 13 into a primary chamber 13a and a secondary chamber 13b. The water amount adjustment chamber 20 is provided with a temperature regulator 23, and the temperature regulator 23 is connected to the temperature adjustment knob 22.

  In addition, a water supply passage 8 that supplies water to the water amount adjustment mechanism 21, a passage 16 that draws water from the water amount adjustment mechanism 21, and a drainage passage 24 are connected to the water amount adjustment mechanism 21. A filter 25 is interposed in the water supply passage 8, and a drain plug 26 is provided in the drainage passage 24.

  A gas passage 32 is connected to the hot water supply main burner 10, and the gas passage 32 is connected to a gas introduction passage 35 via a water pressure automatic gas valve 33 and an instrument plug 34. The water automatic gas valve 33 is provided so as to be connected to the diaphragm 14. The instrument plug 34 is connected to an instrument plug knob 48 via a shaft 50, and a gas solenoid valve 54 is provided on the lower side of the instrument plug 34. The gas introduction passage 35 is for introducing fuel gas from the outside into the combustion apparatus, and the fuel gas introduced from the gas introduction passage 35 is supplied to the hot water supply main burner 10 through the gas passage 32 via the appliance plug 34. Is done. In addition, gas passages 36 and 37 are connected to the appliance plug 34, and the fuel gas introduced from the gas introduction passage 35 to the appliance plug 34 is introduced into the pyrophoric burner 38 through the gas passage 36, and gas is supplied to the appliance plug 34. It is configured to be supplied to the bath main burner 39 through the passage 37.

  A flame rod electrode 12 (12a) for detecting the flame of the pilot burner 38 is provided in the vicinity of the flame outlet of the pilot burner 38. In addition, as shown in FIG. 3, a configuration is proposed in which a hot water supply side frame rod electrode 12 (12 b) for detecting the flame of the hot water supply main burner 10 is provided in the vicinity of the flame opening of the hot water supply main burner 10. This proposal has not yet been made public.

  An instrument plug switch 52 (52a, 52b, 52c) is interposed in the shaft 50, and the instrument plug switch 52 is constituted by a micro switch. The instrument plug knob 48 is rotatable, and the instrument stopper knob 48 is pushed down from the “stop” position and turned to the “flame” position. The shaft 50 is lowered together with the instrument plug knob 48, the instrument plug switch 52a is turned on, the electromagnetic valve 54 is opened, and the ignition is possible (ignition to the pilot burner 38). That is, the fuel gas flows through the gas introduction passage 35 to the inlet of the instrument plug 34. Since the fuel gas passes through the instrument plug 34 and flows to the pilot burner 38, the pilot burner 38 is ignited by the ignition plug 59 of the ignition device 60 under the control of the combustion control unit (not shown). Is called. Further, when the instrument plug knob 48 is released (removing the pushing-down force) and returned from the “flame” position to the “stop” position, the instrument plug switch 52a is turned off and the fire extinguishing state is entered.

  When the appliance plug knob 48 is turned to the “hot water” or “Oidaki” position, the appliance plug switches 52b and 52c detect the positions of “hot water” and “Oidaki” of the appliance plug knob 48. As shown in the figure, the pilot burner 38, the hot water supply main burner 10, and the bath main burner 39 are combusted by performing an on / off operation. That is, the hot water supply main burner 10 is burned while the appliance plug switches 52b and 52c are both on, and the bath main burner 39 is burned while the appliance plug switch 52c is off and the appliance plug switch 52b is on. .

  In FIG. 3, reference numeral 51 denotes a water self-valve switch, 49 denotes a capacity switching knob, and 45 denotes an overheat prevention device.

  In this bath water heater, when a water tap (not shown) is opened, water flows through the water passage 8 through the water governor 15 to the primary chamber 13a of the diaphragm case 13 and is branched by the water amount regulator 23. One of them passes through the passage 16 and is led to the hot water supply passage 11 side. The other is led to the hot water supply passage 11 side through the water supply introduction passage 19 and the hot water supply heat exchanger 7, and flows from the hot water supply passage 11 to the hot water discharge pipe 30 (or the shower side passage 31) to be discharged.

  Furthermore, the fuel gas flows to the position where the water pressure automatic gas valve 33 is disposed by adjusting the instrument plug knob 48 to the position of “hot water supply”. When the hot-water tap 9 is opened in this state and water begins to flow through the water supply passage 8, this water passes from the primary chamber 13 a of the diaphragm case 13 through the passage 16, and the low pressure obtained by opening to the atmosphere causes the low pressure to be obtained by the passage 16. The pressure is transmitted to the next chamber 13b, and the differential pressure from the first chamber 13a (high pressure) acts as a load due to the area of the diaphragm 14, and the diaphragm 14 moves to the secondary chamber 13b side.

  As a result, the water pressure automatic gas valve 33 connected to the diaphragm 14 is opened, fuel gas is supplied to the hot water supply main burner 10 through the gas passage 32, and the hot water supply main burner 10 is ignited from the ignition of the pilot burner 38. That is, the hot water supply main burner 10 starts combustion when the amount of water flowing (introduced into the combustion device) by opening the hot water tap 9 becomes equal to or higher than a predetermined set operating flow rate. The water passing through the hot water supply heat exchanger 7 is heated by the combustion of the hot water supply main burner 10 and discharged from the hot water discharge pipe 30 (or the shower side passage 31).

  Although not shown in FIG. 3, the bath reheating heat exchanger 40 is connected to the bathtub through the bath circulation passage, and the hot water is moved to a position higher than the connection part (upper circulation port) by, for example, 10 cm or more. Alternatively, the fuel plug is supplied to the bath main burner 39 through the passage 36 by setting the appliance plug knob 48 to the “Oidaki” position in a state where water has been added. And the hot water in the bathtub is heated by circulating through the heat exchanger 40.

  Next, a characteristic control configuration of the present embodiment shown in FIG. 1 will be described. As shown in the figure, the present embodiment has an energization circuit 3 for connecting a gas solenoid valve 54 and a power source 1 for supplying a current to the solenoid valve 54. A transistor Q1, a bath high limit switch 46, a hot water supply high limit switch 47, a transistor Q2, and a series fuse circuit 63 are connected in series with the valve 54 from the power source 1 side.

  The base side of the transistor Q1 is connected to the microcomputer 2 via the resistor R1, and the base side of the transistor Q2 is connected to the microcomputer 2 via the resistor R2. Further, a hot water supply high limit switch 47 is connected to the emitter side of the transistor Q2, and a series fuse circuit 63 is connected to the collector side of the transistor Q2 via a resistor Rd. The series fuse circuit 63 is formed of a series circuit of a temperature fuse 61 of the hot water supply heat exchanger 7 and a temperature fuse 62 of the bath reheating heat exchanger 40. In the figure, R4, R5, and R6 each indicate resistance.

  The bath high limit switch 46 functions as a bath emptying prevention switch that outputs an off signal as an answer signal when the temperature of the bath reheating heat exchanger 40 exceeds a predetermined temperature setting for air blowing detection. The high limit switch 47 functions as a hot water supply emptying prevention switch that outputs an off signal as an answer signal when the temperature of the hot water supply heat exchanger 7 exceeds a predetermined setting temperature for detection of emptying. The bath high limit switch 46 outputs an ON signal as an answer signal when the temperature of the bath reheating heat exchanger 40 is equal to or lower than a predetermined temperature setting for air-burning detection, and the bath reheating heat exchange is performed. When the temperature of the container 40 exceeds the set temperature for detection of emptying, an off signal is output as an answer signal. The hot water supply high limit switch 47 outputs an ON signal as an answer signal when the temperature of the hot water supply heat exchanger 7 is equal to or lower than a predetermined temperature setting for air-burning detection, and the temperature of the hot water heat exchanger 7 When the temperature exceeds the set temperature for air detection, an off signal is output as an answer signal.

  In this embodiment, a bath high limit switch 46 and a hot water supply high limit switch 47 are provided in series. When an off signal is output from at least one of the hot water supply high limit switch 47 and the bath high limit switch 46, the solenoid valve 54 is provided. The structure is closed. Therefore, when either the hot water supply heat exchanger 40 or the hot water supply heat exchanger 7 is heated, the energization of the electromagnetic valve 54 is immediately cut off, the electromagnetic valve 54 is closed, and the pilot burner 38 is closed. And the burner combustion of the bath main burner 40 and the hot water supply main burner 10 is stopped.

  In this embodiment, the microcomputer 2 is provided with an answer signal receiving circuit 5 and a combustion forbidden prohibiting means 6. The answer signal receiving circuit 5 includes the answer signal of the first switch (here, the bath high limit switch 46) provided on the side close to the power source 1 among the bath high limit switch 46 and the hot water supply high limit switch 47, and the power source 1 The answer signal of the second switch (here, hot water supply high limit switch 47) provided on the side far from the remote controller is taken in via individual signal transmission paths A and B, respectively.

  The signal transmission path A is a path for transmitting the answer signal of the first switch (the bath high limit switch 46) to the answer signal receiving circuit 5, and the signal transmission path A includes a capacitor C1 and a resistor Rt. A time constant circuit 4 is provided. The signal transmission path B is a path for transmitting the answer signal of the second switch (hot water supply high limit switch 47) to the answer signal receiving circuit 5, and the signal transmission path B is provided with resistors Rb1 and Rb2. In this embodiment, such signal transmission paths A and B are provided, and an answer signal is output from the first switch (bath high limit switch 46) and from the second switch (hot water supply high limit switch 47). The answer signal receiving circuit 5 distinguishes the case where the answer signal is output.

  In other words, if both the bath reheating heat exchanger 40 and the hot water supply heat exchanger 7 are not blown, and both the bath high limit switch 46 and the hot water supply high limit switch 47 are normal, an on signal is output together. As shown in FIG. 2A, both the answer signal aA applied to the answer receiving circuit 2 through the signal transmission path A and the answer signal aB applied to the answer receiving circuit 2 through the signal transmission path B are both high. When the level (H) is reached, but at least one of the bath reheating heat exchanger 40 and the hot water supply heat exchanger 7 is aired, as shown in FIGS. 2 (b) to 2 (d), the answer signal aA , AB is different.

  For example, in the case where the bath-heating heat exchanger 40 is aired and only the bath high limit switch 46 (first switch) outputs an OFF signal (disconnected), it is shown in FIG. As described above, the signal levels of the answer signal aA and the answer signal aB both gradually decrease with the inclinations θ1 and θ2 from the OFF signal output timing To of the bath high limit switch 46, respectively, and decrease to the low level (L ) Note that the magnitudes of the decreasing slopes θ1 and θ2 of the answer signals aA and aB are caused by the magnitudes of the capacitor C1 and the resistors Rt, Rb1, and Rb2. Further, when the hot water supply heat exchanger 7 is aired and only the hot water supply high limit switch 47 (second switch) outputs an OFF signal (disconnected), as shown in FIG. The signal level of the answer signal aA remains at a high level, and the signal level of the answer signal aB instantaneously falls to a low level (L) at the off signal output timing To of the hot water supply high limit switch 47.

  Furthermore, when the hot air supply heat exchanger 40 and the hot water supply heat exchanger 7 are aired and both the high limit switch 46 and the high limit switch 47 output an off signal (disconnected), As shown in FIG. 2D, the signal level of the answer signal aA has a time constant from the off signal output timing To of the bath high limit switch 46, and gradually decreases with a slope θ4 to reach a low level (L). The signal level of the answer signal aB instantaneously falls to the low level (L) at the OFF signal output timing To of the hot water supply high limit switch 47. The difference in the level of the answer signal aA in FIG. 2B and the level of the answer signal aA in FIG. 2D is different (θ1 and θ4 are different) are stored in the capacitor C1. It depends on whether the generated electricity is discharged through the microcomputer 2 and the resistor Rt or only on the microcomputer 2 side.

  The answer signal receiving circuit 5 determines which of the high limit switches 46 and 47 outputs the off signal according to the levels of the answer signals aA and aB, and delays after the bath high limit switch 46 is turned off, for example. Even the timing when the hot water supply high limit switch 47 is turned off after t seconds can be known. When the hot water supply high limit switch 47 is also turned off after t seconds after the bath high limit switch 46 is turned off, the answer signal aA decreases to t seconds after the inclination θ1 as shown in FIG. Thereafter, after t seconds, it decreases at the inclination θ4 shown in FIG. 2D and reaches the low level (L). The answer signal aB decreases to t seconds after the inclination θ2, and then instantaneously reaches a low level (L) after t seconds. Then, the answer signal receiving circuit 5 adds the number of OFF signal detections of the bath high limit switch 46 detected by the difference between the levels of the answer signals aA and aB to the combustion forbidden prohibiting means 6.

  It should be noted that such a switch-off timing or the like is not a problem, and when the hot water supply high limit switch 47 is not turned on / off after the bath high limit switch 46 is turned off, that is, the bath high limit switch 46 is turned off. In the case where the hot water supply cannot be used, that is, when there is no desire to use only the hot water supply, as shown in FIG. 4, the energization circuit 3 omitting the capacitor C1 can be applied. The answer signal in this case is as shown in FIG. 5A shows a case where both the bath high limit switch 46 and the hot water supply high limit switch 47 are normal, and FIG. 5B shows only the bath high limit switch 46 (first switch) being an OFF signal. 5 (c) shows a case where only the hot water supply high limit switch 47 (second switch) outputs an off signal (disconnected), and FIG. 5 (d) The case where both the bath high limit switch 46 and the hot water supply high limit switch 47 output an OFF signal (disconnected) is shown.

  Further, as shown in FIG. 1, between the second switch (hot water supply high limit switch 47) of the energization circuit 3 and the electromagnetic valve 54, the transistor Q2 and the transistor Q2 are sequentially arranged from the second switch toward the electromagnetic valve 54. A resistor Rd and a series fuse circuit 63 are interposed, and a signal transmission path C is provided at a connection portion between the resistor Rd and the series fuse circuit 63. The order in which the transistor Q2, the resistor Rd, and the series fuse circuit 63 are arranged is not limited, and is appropriately set. Between the second switch (hot water supply high limit switch 47) and the solenoid valve 54 The signal transmission path C is also formed according to the arrangement mode. The signal transmission path C is a path for transmitting the voltage value to the answer signal receiving circuit 5 in an analog manner. As shown in the answer signal aC in FIGS. The signal is transmitted to the answer receiving circuit 2, and the disconnection signal of the thermal fuses 61 and 62 is transmitted to the answer signal receiving circuit 5.

  That is, when the temperature fuses 61 and 62 are not disconnected, the power voltage (3 V) is supplied through the signal transmission path C when the bath high limit switch 46 and the hot water supply high limit switch 47 output the ON signal. A voltage (for example, 2.7 V) divided by the resistor Rd and the resistor incorporated in the solenoid valve 54 (coil resistance of the solenoid valve 54) is transmitted to the answer signal receiving circuit 5, and when the temperature fuses 61 and 62 are disconnected, the power supply The voltage is transmitted to the answer signal receiving circuit 5. The answer signal receiving circuit 5 is configured to be able to grasp the presence or absence of disconnection of the thermal fuses 61 and 62 based on the difference in voltage. As shown in FIG. 2B, when only the bath high limit switch 46 outputs an OFF signal, the answer signal aC also decreases with a time constant (with a slope θ3), and FIG. As shown in (d), when the hot water supply high limit switch 47 outputs an OFF signal, the answer signal aC also decreases instantaneously. Further, when the hot water supply high limit switch 47 is also turned off after t seconds after the bath high limit switch 46 is turned off, the answer signal aC has a slope θ3 after t seconds as shown in FIG. After reaching a low level, it reaches the low level (L) instantly after t seconds.

  When the off signal from the bath high limit switch 46 is output for a predetermined number of times (for example, 5 times) or more, the combustion compulsion prohibiting means 6 is in a state in which the instrument plug switch 52c is off and the instrument plug switch 52b is on. When this happens (when the appliance plug knob 48 is in the “Oidaki” position), the solenoid valve 54 is closed so that the bath main burner 39 cannot be forcibly burned. Further, during this forced combustion stop, a forced combustion stop signal is applied to the notification means 70.

  For example, the operation unit 71 shown in FIG. 3 indicates that the notification unit 70 indicates that the combustion forcible prohibition for preventing the bathing of the bath is prohibited when the combustion forcible prohibition unit 6 cannot forcibly burn the burner. This is notified by the blinking of the red LED 72. Note that the manner of notification is not particularly limited, and is appropriately set.

  The bath high limit switch 46 and the hot water supply high limit switch 47 are classified into an automatic return type and a manual return type, and both the bath high limit switch 46 and the hot water supply high limit switch 47 applied to this embodiment are used. This is an automatic return type switch. That is, the bath high limit switch 46 automatically returns and outputs an ON signal when the temperature of the heat exchanger 40 for reheating the bath drops below the air heating temperature, and the hot water supply high limit switch 47 is the hot water supply heat exchanger. When the temperature of 7 falls below the freezing temperature, it automatically recovers and outputs an ON signal.

  In addition, this invention is not limited to the said Example, It sets suitably. For example, in the above-described embodiment, in the energizing circuit 3, the bath high limit switch 46 is provided on the side close to the power source 1 as the first switch, and the hot water supply high limit switch 47 is provided on the side far from the power source 1 and the second switch. However, conversely, the hot water supply high limit switch 47 may be provided on the side close to the power source 1 to be the first switch, and the bath high limit switch 46 may be provided on the side far from the power source 1 to be the second switch.

  In the energization circuit 3, the resistor Rd can be omitted. However, since the disconnection of the temperature fuses 61 and 62 can be detected separately from the off signal output of the bath distribution limit switch 4 and the hot water supply high limit switch 47 by providing the resistor Rd, it is preferable to provide the resistor Rd.

  Further, for example, as shown in FIG. 6, an energizing circuit 3 (3a) for flowing current from the power source 1 (1a) to the electromagnetic valve 54 via the hot water supply high limit switch 47, and a bath high limit switch 46 from the power source 1 (1b). It is also possible to provide the bath water heater with a configuration in which the energization circuit 3 (3b) for passing a current is separately formed and each is connected to the microcomputer 2. In FIG. 6, the same components as those in FIG.

  In this example, the energizing circuit 3a is formed by connecting a transistor Q1, a hot water supply high limit switch 47, a transistor Q2, and a series fuse circuit 63 in series between the power source 1a and the solenoid valve 54 in order from the power source 1a side. The base side of the transistor Q1 is connected to the microcomputer 2 via the resistor R1, and the base side of the transistor Q2 is connected to the microcomputer 2 via the resistor R2. Further, a hot water supply high limit switch 47 is connected to the emitter side of the transistor Q2, and a series fuse circuit 63 is connected to the collector side of the transistor Q2 as in the above embodiment.

  The hot water supply high limit switch 47 outputs an ON signal as an answer signal when the temperature of the hot water supply heat exchanger 7 is equal to or lower than a predetermined temperature setting for air detection (when normal), and the hot water supply heat exchanger 7 When the temperature exceeds the set temperature for air detection, an off signal is output as an answer signal. In the energization circuit 3a, when an off signal of the hot water supply high limit switch 47 is output, the energization to the solenoid valve 54 is cut off, the solenoid valve 54 is closed, and combustion of the hot water supply main burner 10 is stopped. . The answer signal is transmitted to the answer signal receiving circuit 5 (5a) of the microcomputer 2 through the signal transmission path E (first signal transmission path). The on signal and off signal of the transistor Q2 are transmitted to the microcomputer 2 as an answer signal through a signal transmission path F in which a resistor R3 is interposed.

  On the other hand, in the energization circuit 3b, a resistor R8 and a bath high limit switch 46 are connected in series to the power source 1b, and a signal transmission path G (second signal transmission) in which a resistor R7 is interposed at the connection portion. Route). The bath high limit switch 46 outputs an ON signal as an answer signal when the temperature of the bath reheating heat exchanger 40 is equal to or lower than a predetermined temperature for detecting air reheating (when normal), and bath reheating heat is output. When the temperature of the exchanger 40 exceeds the empty detection setting temperature, an off signal is output as an answer signal. These answer signals are transmitted to the answer signal receiving circuit 5 (5b) of the microcomputer 2 through the signal transmission path G. When the off signal of the bath high limit switch 46 is transmitted, the microcomputer 2 turns off the transistors Q1 and Q2, shuts off the energization of the solenoid valve 54, closes the solenoid valve 54, and burns the bath main burner 39. Stop.

  The answer signal receiving circuit 5 (5a, 5b) of the microcomputer 2 detects the number of times of off signal output of the hot water supply high limit switch 47 and the bath high limit switch 46, and the number of times of output of the off signal of the bath high limit switch 46 is determined. When the set number of times is exceeded, for example, as in the above-described embodiment, a safety operation may be performed such that a signal is applied to the combustion forbidden prohibiting means 6 so that the bath main burner 39 cannot be forcibly burned. .

  A configuration in which the bath high limit switch 46 and the hot water supply high limit switch 47 in the configuration shown in FIG. 6 are replaced can also be applied to the bath water heater. In this case, when the bath high limit switch 46 outputs an off signal, the energization of the solenoid valve 54 is cut off, the solenoid valve 54 is closed, and the combustion of the bath main burner 39 is stopped. Further, the microcomputer 2 turns off the transistors Q1 and Q2 when the off signal of the hot water supply high limit switch 47 is transmitted, shuts off the energization to the solenoid valve 54, closes the solenoid valve 54, and the hot water supply main burner 7 The combustion may be stopped.

  In the configuration in which only one of the hot water supply high limit switch 47 and the bath high limit switch 46 is directly connected to the electromagnetic valve 54 as in the example shown in FIG. 6, when the microcomputer 2 is troubled, the electromagnetic valve Even if the switch on the side not directly connected to 54 outputs an OFF signal, the solenoid valve 54 is not closed, and the hot air flow of the bath reheating heat exchanger 40 is continued. As described above, it is preferable to provide a bath high limit switch 46 and a hot water supply high limit switch 47 connected in series between the power source 1 and the electromagnetic valve 54.

  Further, the system configuration of the bath hot water supply apparatus of the present invention is not necessarily the configuration shown in FIG. 3, and the hot water main burner 10, the hot water supply heat exchanger 7, the bath main burner 39, and the bath reheating heat exchanger. 40, the fuel gas supply passage to the burner, and the electromagnetic valve 54, and the energization circuit 3 as shown in FIGS.

  Furthermore, in the above embodiment, the combustion forbidden prohibiting means 6 cannot forcibly perform the combustion of the bath main burner 39 when the OFF signal from the bath high limit switch 46 is output more than a preset number of times. However, the combustion forbidden prohibiting means 6 closes the electromagnetic valve 54 when the OFF signal from the bath high limit switch 46 is output for a predetermined number of times or more, so that the bath main burner 39 and the hot water supply main You may make it not compulsorily perform all the combustion of the burner 10 and the pilot burner 38. FIG. In addition, when the hot water supply main burner 10 cannot be forcibly burned in this way, the bath high limit switch 46 outputs an on signal after the bath high limit switch 46 outputs an off signal more than a set number of times. Sometimes, the hot water supply main burner 10 may be combusted.

  The present invention is capable of immediately stopping combustion when an air blow occurs in a heat exchanger provided with an air blow prevention switch, and the number of times that the hot water supply heat exchanger and the bath reheating heat exchanger are aired. Can be detected and dealt with individually, so it can be used as a safe and long-life bath water heater.

DESCRIPTION OF SYMBOLS 1 Power supply 2 Microcomputer 3 Current supply circuit 4 Time constant circuit 5 Answer signal receiving circuit 6 Combustion forced prohibition means 7 Hot water supply heat exchanger 10 Hot water supply main burner 38 Pilot burner 39 Bath main burner 40 Bath reheating heat exchanger 70 Notification means

Claims (12)

  A hot water supply main burner, a hot water supply heat exchanger heated by the hot water supply main burner, a bath main burner, a bath reheating heat exchanger heated by the bath main burner, the hot water supply main burner, and the bath main burner An off signal is used as an answer signal when the temperature of the gas supply passage for supplying fuel gas, the solenoid valve provided in the gas supply passage, and the temperature of the hot water heat exchanger exceeds a predetermined setting temperature for detection of airing A hot water supply emptying prevention switch for output and a bath emptying prevention switch for outputting an off signal as an answer signal when the temperature of the bath heating heat exchanger exceeds a predetermined temperature setting for detection of emptying. An energizing circuit for connecting the solenoid valve and a power source for supplying current to the solenoid valve, and the hot water supply is provided between the power source of the energizing circuit and the solenoid valve. A spark prevention switch and the bath empty prevention switch are provided in series, and the solenoid valve is closed when an off signal is output from at least one of the bath empty prevention switch and the hot water supply empty prevention switch. The answering signal of the first switch provided on the side closer to the power source and the second switch provided on the side farther from the power source among the hot water supply emptying prevention switch and the bath emptying prevention switch The answer signal receiving circuit takes in each answer signal through a separate signal transmission path, and the signal transmission path for transmitting the answer signal of the first switch to the answer signal receiving circuit is constituted by a capacitor and a resistor. A time constant circuit is provided and an off signal is output from the first switch, and an off signal is output from the second switch. Bath water heater, characterized in that the case is force the answer signal receiving circuit forms a structure distinguished.   The energization circuit is formed by providing a resistor in place of the time constant circuit in the signal transmission path for transmitting the answer signal of the first switch to the answer signal receiving circuit, and the answer signal receiving circuit is at least the first switch The bath hot water supply device according to claim 1, wherein a case where an off signal is output from the first switch and a case where an off signal is output only from the second switch are distinguished from each other.   The energization circuit is provided with a series fuse circuit in series of a temperature fuse of a hot water supply heat exchanger and a temperature fuse of a bath reheating heat exchanger between a power source and a solenoid valve. The bath hot-water supply apparatus of Claim 1 or Claim 2.   4. The hot water supply emptying prevention switch, the bath emptying prevention switch, and the series fuse circuit in the energization circuit, wherein the bath emptying prevention switch is provided on the side closest to the power source. Bath water heater.   The series fuse circuit is provided between the second switch of the energization circuit and the solenoid valve, and a transistor and a resistor are interposed between the second switch and the solenoid valve, A signal transmission path is provided for transmitting a disconnection signal of the thermal fuse of the series fuse circuit to the answer signal reception circuit. When the thermal fuse is not disconnected by the signal transmission path, the power supply voltage is incorporated in the resistor and the solenoid valve. The bath hot water supply apparatus according to claim 3 or 4, wherein a voltage divided by a resistor is transmitted and a power supply voltage is transmitted when the thermal fuse is disconnected.   A hot water supply main burner, a hot water supply heat exchanger heated by the hot water supply main burner, a bath main burner, a bath reheating heat exchanger heated by the bath main burner, the hot water supply main burner, and the bath main burner An off signal is used as an answer signal when the temperature of the gas supply passage for supplying fuel gas, the solenoid valve provided in the gas supply passage, and the temperature of the hot water heat exchanger exceeds a predetermined setting temperature for detection of airing A hot water supply emptying prevention switch for output and a bath emptying prevention switch for outputting an off signal as an answer signal when the temperature of the bath heating heat exchanger exceeds a predetermined temperature setting for detection of emptying. And an energization circuit that connects the solenoid valve and a power source that supplies current to the solenoid valve is formed, and the power source of the energization circuit and the solenoid valve include A switch on one side of either the hot water blowing prevention switch and the bath empty blowing prevention switch is provided in series, and when the off signal is output from the switch, the solenoid valve is closed. An answer signal receiving circuit for taking in the answer signal of the switch on one side via the first signal transmission path is provided, and further, the switch on the other side of the hot water emptying prevention switch and the bath emptying prevention switch is provided. The bath hot water supply apparatus provided with the answer signal receiving circuit which takes in an answer signal through a 2nd signal transmission path | route.   The energization circuit is provided with a series fuse circuit in series of a temperature fuse of a hot water supply heat exchanger and a temperature fuse of a bath reheating heat exchanger between a power source and a solenoid valve. 6. The bath water heater according to 6.   The switch provided between the power supply of the energizing circuit and the solenoid valve is a bath empty switch, and the bath empty switch includes a temperature fuse of the hot water supply heat exchanger and a temperature fuse of the bath reheating heat exchanger. The bath hot water supply device according to claim 6, wherein a series fuse circuit is provided in series, and the bath emptying switch is provided closer to the power source than the series fuse circuit.   Combustion compulsion prohibiting means is provided to prevent the main burner from burning when the off signal from the bath emptying prevention switch is output more than a predetermined number of times. The bath hot-water supply apparatus as described in any one of Claim 1 thru | or 8.   A hot water supply main burner and a pilot burner for spark ignition to the bath main burner, and when the OFF signal from the bath emptying prevention switch is output more than a predetermined number of times, the bath main burner and the hot water supply main burner The bath hot water supply device according to any one of claims 1 to 8, further comprising combustion forbidden prohibiting means for forcibly preventing all combustion of the pilot burner.   The hot water supply main burner according to claim 10, wherein the hot water supply main burner can be combusted when the bath emptying prevention switch outputs an ON signal after the OFF signal has been output a set number of times or more.   The informing means for informing that the forcible combustion is prohibited for preventing bathing when the combustion of the burner is forcibly prevented by the forcible combustion prohibiting means. The bath hot water supply apparatus of Claim 9 or Claim 10 or Claim 11.

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