JP2005147579A - Gas combustion room heater and water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent overheating and boiling-up in the other water pipe at a non-operation side in performing a single operation for supplying the hot water or a single operation for heating. <P>SOLUTION: This gas combustion room heater and water heater comprises a primary heat exchanger 1 where a water pipe 1a for heating a hot water supply circuit and a water pipe 1b for heating a heating circuit are composed of a single water circulation flow channel pipe in a heat exchanger of one can body, a primary hot water circulating passage forming a closed circuit by being connected from an outlet of the single water circulation flow channel pipe to an inlet of the single water circulation flow channel pipe through a secondary heat exchanger for heating 15, a tapping flow channel 3 branched from the single water circulation flow channel and provided with a taking-out port for supplying the hot water, a burner 4 for heating the primary heat exchanger 1, and a combustion fan 32, and performs the hot water supplying operation using the tapping flow channel 3, the heating operation using the secondary heat exchanger 15 or a simultaneous operation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides a hot water supply operation for supplying hot water to a kitchen, a washroom, a currant, a shower, etc., a heating operation for supplying hot water to a heating terminal such as a bathroom heating dryer, hot water air conditioner, floor heating hot water mat, etc. In a gas hot water heater that performs bath operation to replenish a certain amount of hot water or bath water, a single water circulation channel pipe that combines a hot water supply water pipe and a heating circuit heating water pipe is placed in a single heat exchanger. It is related with the technique which provides the heat source machine which can take out the hot water of these some uses from the structure which was made.

  Conventionally, this kind of gas hot-water heater has a configuration as shown in FIG. That is, the heat exchanger 101 in which two water pipes of a hot water supply circuit water pipe and a heating circuit water pipe are arranged in one can, the combustion burner 102 that heats the heat exchanger 101, and the amount of gas supplied to a plurality of gas supply passages are unified. The fuel gas supply unit 104 controlled by the two gas proportional control valves 103, the combustion fan 105 for supplying combustion air to the combustion burner 102, the water inlet passage 106 through which the supply water flows, and the heat exchanger 101 are heated. Hot water outlet passage 107 through which hot water flows, hot water supply bypass passage 108 branched from the incoming water passage 106 to enter the outgoing hot water passage 107, incoming water temperature thermistor 109 for detecting incoming water temperature, and incoming water flow for detecting the water flow at the time of incoming water. A detection means 110, a hot water supply bypass control valve 111 for adjusting the opening degree of the hot water supply bypass flow path 108, a secondary hot water circulation flow path 112 through which secondary hot water as heating hot water flows, It has a configuration in which a control unit 113 for controlling the operation of the al, can be carried out single hot water supply run, the heating alone operation, and the simultaneous operation thereof.

  As a feature of this configuration, a hot water supply circuit tube which is a single water pipe is arranged in a hot water supply side heat exchanger which is a single can body, and a heating circuit pipe which is a single water pipe is arranged in a heating side heat exchanger which is a single can body. The conventional two-can / two-water heat exchanger configuration is a single-can / two-water configuration in which the two water pipes for the hot water supply circuit and the heating circuit are arranged in a single heat exchanger. (See, for example, Patent Document 1).

  Hereinafter, the operation in the case of a single hot water supply operation, a single heating operation, and simultaneous operation thereof will be described with reference to FIG.

  First, in the case of a single hot water supply operation, when the user opens the hot water tap, the water flow is detected by the incoming water flow detection means 110, and the control means 113 sets the gas source solenoid valve 11427 to “open” and a part of the combustion burner 102. Is started, and the fuel proportional flow control valve 103 adjusts the fuel gas flow rate to start combustion.

  At this time, the control means 113 adjusts the combustion amount while detecting the incoming water temperature detected by the incoming water temperature thermistor 109 so that the temperature detected by the hot water supply heat exchanger outlet thermistor 115 becomes a predetermined temperature (for example, 55 ° C.). Do.

  Then, the control means 113 sets the hot water temperature detected by the hot water temperature thermistor 116 in which hot water flowing through the hot water flow path 107 exiting the heat exchanger 101 and tap water flowing through the hot water supply bypass flow path 108 are mixed. The opening degree of the hot water supply bypass control valve 108 is adjusted so that the temperature becomes the same.

  In addition, although heating operation is not performed at this time, since the heating circuit water pipe and the hot water supply circuit water pipe partially overlap in the heat exchanger 101 which is a can body, the hot water in the heating circuit water pipe is also heated. Will be. Therefore, there is a risk that the hot water in the heating circuit water pipe will overheat and boil.

  Next, in the case of heating independent operation, when the control unit 113 is input to start the heating operation, the control unit 113 drives the secondary hot water circulation pump 117 to convey the hot water in the secondary hot water circulation passage 112.

  The control means 113 opens the gas source electromagnetic valve 114, sparks an igniter provided in a part of the combustion burner 102, adjusts the fuel gas flow rate with the gas proportional control valve 103, and starts combustion. In the case of heating single combustion, a part of the combustion burner 102 is used to heat the heating circuit water pipe.

  The control means 113 adjusts the amount of combustion so that the secondary hot water temperature detected by the secondary hot water heat exchanger outlet thermistor 118 becomes a predetermined temperature (for example, 80 ° C.).

  In addition, although the hot water supply operation is not performed at this time, since the heating circuit water pipe and the hot water supply circuit water pipe partially overlap in the heat exchanger 101 which is a can, the hot water in the hot water supply circuit water pipe is also heated. Will be. Therefore, there is a risk that water in the hot water supply circuit water pipe will overheat and boil.

Finally, in the case of the simultaneous operation in which the hot water supply operation and the heating operation are performed at the same time, the hot water supply operation is preferentially performed, and thus the hot water temperature control on the heating side becomes a success. Therefore, when the control means 113 decreases the opening degree of the gas proportional control valve 103, the supply heat amount is insufficient with respect to the required temperature on the heating side, or when the opening degree of the gas proportional control valve 103 is increased. It is conceivable to supply an excessive amount of heat with respect to the required temperature on the heating side. Further, in the portion where the hot water supply circuit water pipe and the heating circuit water pipe are overlapped, the amount of heat absorption differs depending on the hot water temperature in each water pipe, so that the control means 24 requires complicated hot water temperature control.
Japanese Patent Laid-Open No. 9-243166

  As described above, a conventional gas hot water heating / heating system in which a double water pipe of a hot water supply circuit water pipe and a heating circuit water pipe is arranged in a single heat exchanger and heated by a single combustion burner and a single combustion fan. The machine has a problem that when the hot water supply single operation or the heating single operation is performed, the other water pipe that is not operated overheats and boils.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to avoid overheating and boiling of the other pipe that is not operated when performing a hot water supply single operation or a heating single operation. Also, a relatively simple hot water temperature control method is provided during simultaneous operation of hot water supply operation and heating operation.

  In order to solve the above-described conventional problems, the gas hot water heater of the present invention has a single water circulation channel pipe that serves both as a hot water supply circuit heating water pipe and a heating circuit heating water pipe in a single heat exchanger, Connected from the outlet of the single water circulation channel pipe to the inlet via a secondary heat exchanger for heating to form a closed circuit to form a primary hot water circulation channel, and heating the hot water supply circuit of the single water circulation channel pipe A hot water flow path is formed by branching from a boundary portion between the water pipe and the heating circuit heating water pipe, and the single water circulation flow path pipe is heated by a single combustion burner and a single combustion fan.

  According to the above-described invention, hot water is supplied from the hot water supply channel branched from the single water circulation channel pipe during hot water supply operation, and hot water in the single water circulation channel tube is conveyed by the dedicated circulation pump during heating operation, Since the heating circuit tube is heated by the secondary heat exchanger provided in the above, when the hot water supply single operation or the heating single operation is performed, the other tube that is not operated can be prevented from overheating and boiling.

  According to the gas hot water heater of the present invention, a single water circulation passage pipe that serves both as a hot water supply circuit water pipe and a heating circuit heating water pipe is arranged in a single heat exchanger, and a combustion burner and a single combustion fan It is configured to heat a single single water circulation channel pipe at the time of hot water supply, hot water is supplied from a hot water outlet branching from the single water circulation channel pipe, and hot water in the single water circulation channel pipe is dedicated for heating operation. The heating circuit tube is heated by a secondary heat exchanger that is transported by a circulation pump and provided in the middle of a single water circulation channel tube, and includes control means for performing these operations.

  Thus, in the conventional configuration in which the two water pipes are arranged in one can, it is possible to avoid overheating and boiling of the other pipe that is not operated when performing hot water single operation or heating single operation.

  The first invention includes a primary heat exchanger in which a hot water supply circuit heating water pipe and a heating circuit heating water pipe are formed by a single water circulation passage pipe in a single heat exchanger, and an outlet of the single water circulation passage pipe. A primary hot water circulation path connected to the inlet of the single water circulation passage pipe through a secondary heat exchanger for heating to form a closed circuit, and a hot water supply outlet being branched from the middle of the single water circulation passage A hot water supply operation using the hot water flow channel, a heating operation using the secondary heat exchanger, or the hot water flow channel channel, and a burner and a combustion fan for heating the primary heat exchanger. And it is set as the structure which performs simultaneous operation using a secondary heat exchanger.

  And since hot water used for hot water supply or heating is obtained from circulating water flowing through one single water circulation passage pipe heated by a burner, the other pipe that is not operated when performing hot water supply single operation or heating single operation Can avoid the phenomenon of overheating and boiling. In addition, it is not necessary to configure two water channels in one heat exchanger as in the prior art, and the configuration can be simplified.

  According to a second aspect of the present invention, a primary heat exchanger that heats a single water pipe in a single can, a single combustion burner that heats the primary heat exchanger, and an amount of fuel gas supplied to a plurality of gas supply channels are A fuel gas supply unit controlled by a gas proportional control valve, a single combustion fan that supplies combustion air to the combustion burner, a water inlet passage through which the supply water flows, and hot water heated by the primary heat exchanger flows A hot water supply flow path, a hot water supply bypass flow path that branches from the incoming water flow path and enters the hot water supply flow path, an incoming water temperature thermistor that detects the incoming water temperature, an outgoing hot water temperature thermistor that detects the outgoing hot water temperature, and a water flow at the time of incoming water Inlet flow detection means, a hot water supply bypass control valve that adjusts the opening degree of the hot water supply bypass passage, an incoming / off valve that feeds supply water to the primary heat exchanger, and hot water supply that detects the temperature of hot water that has exited the primary heat exchanger Primary heat exchanger outlet thermistor and water flow path A primary hot water circulation channel that branches off from the merged hot water flow channel, a primary hot water circulation channel on-off valve that opens and closes the primary hot water circulation channel, and a check valve that prevents backflow from the incoming water channel to the primary hot water circulation channel And a primary hot water circulation pump for conveying hot water in the primary hot water circulation channel, a primary heat exchanger water flow detecting means for detecting a water flow to the primary heat exchanger, and a primary heat exchanger. A primary heat exchanger incoming thermistor for detecting the incoming water temperature, a circulating hot water primary heat exchanger outlet thermistor for detecting the temperature of the circulating hot water exiting the primary heat exchanger, a secondary hot water circulation channel through which the secondary hot water flows, and a primary A secondary heat exchanger for exchanging heat between the hot water circulation channel and the secondary hot water circulation channel, and a control means for controlling these operations are provided. Operation to perform heat exchange and configuration to perform simultaneous operation of them And it is characterized in and.

  In the hot water supply operation, hot water is supplied from the outlet hot water flow channel branched from the primary hot water circulation flow channel, and in the heating operation, the hot water in the primary hot water circulation flow channel is conveyed by a dedicated circulation pump and is provided in the middle of the primary hot water circulation flow channel. Since the secondary hot water circulation channel, which is a heating circuit tube, is heated by the secondary heat exchanger, the water tube heated by the combustion burner has only a single primary hot water circulation channel. It is possible to avoid overheating and boiling of the other pipe not being operated when performing.

  According to a third aspect of the present invention, there is provided a primary heat exchanger in which a hot water supply circuit heating water pipe and a heating circuit heating water pipe are formed by a single water circulation passage pipe in a single can heat exchanger, and an outlet of the single water circulation passage pipe A primary hot water circulation path that is connected to the middle of the single water circulation passage pipe through a secondary heat exchanger for heating to form a closed circuit, and a hot water supply outlet is formed by branching from the middle of the single water circulation passage A hot water supply operation using the hot water flow channel, a heating operation using the secondary heat exchanger, or the hot water flow channel channel, and a burner and a combustion fan for heating the primary heat exchanger. And it is set as the structure which performs simultaneous operation using a secondary heat exchanger.

  The fourth invention is characterized in that the connection between the primary hot water circulation path and the single water circulation path pipe is connected to the downstream side of the hot water supply circuit heating water pipe of the primary heat exchanger and to the upstream side of the heating circuit heating water pipe. It is what.

  And, by separating the hot water supply operation part and the heating operation part in the primary hot water circulation flow path, when performing the hot water supply single operation or the heating single operation, the phenomenon that the other pipe that is not operated is overheated or boiled is further avoided. Can do.

  A fifth invention is a primary heat exchanger for heating a single water pipe in a single can, a combustion burner for heating the primary heat exchanger, and a plurality of fuel gas supplies whose fuel gas amounts are adjusted by respective gas proportional control valves A fuel gas supply section composed of a flow path and a gas flow path opening / closing valve that opens and closes the fuel gas supply flow paths, a single combustion fan that supplies combustion air to the combustion burner, and supply water flows A water inlet passage, a hot water outlet passage through which hot water heated by the primary heat exchanger flows, a hot water supply bypass passage that branches from the incoming water passage and enters the hot water passage, an incoming water temperature thermistor that detects the incoming water temperature, Hot water temperature thermistor for detecting the temperature, incoming water flow detecting means for detecting the water flow at the time of incoming water, a hot water supply bypass control valve for adjusting the opening degree of the hot water supply bypass passage, and the temperature of the hot water leaving the primary heat exchanger Hot water supply primary heat exchanger outlet thermistor A primary hot water circulation channel connected to the single water pipe of the primary heat exchanger downstream from the branch of the hot water flow channel, a primary hot water circulation channel on-off valve for opening and closing the primary hot water circulation channel, and a primary from the incoming water channel A check valve for preventing backflow to the hot water circulation channel, a primary hot water circulation pump for conveying hot water in the primary hot water circulation channel, and a primary hot water circulation for detecting water flow in the primary hot water circulation channel Channel water flow detection means, circulating hot water primary heat exchanger outlet thermistor for detecting the circulating hot water temperature exiting the primary heat exchanger, a secondary hot water circulation channel through which the secondary hot water flows, a primary hot water circulation channel and a secondary hot water circulation channel A secondary heat exchanger for exchanging heat between the secondary hot water circulation passages, and a control means for controlling these operations, hot water supply single operation, operation for exchanging heat in the secondary heat exchanger alone, And it is the structure which carried out those simultaneous driving | operations, It is characterized by the above-mentioned.

  And, assuming that the hot water supply operation is performed during the heating independent operation, in order to avoid the hot water that has been overheated immediately after the hot water tap “opened”, the primary hot water circulation passage is provided with a hot water supply hot water outlet. Two fuel gas supply channels having a gas proportional control valve on the hot water supply side and a gas proportional control valve on the heating side, and a gas channel that opens and closes the fuel gas supply channels. It has a fuel gas supply unit with an on-off valve, and performs combustion control that is controlled by the gas proportional control valve that was operated first in either the hot water supply operation or the heating operation during simultaneous operation of the hot water supply operation and the heating operation. This configuration separates the hot water supply operation part and the heating operation part in the primary hot water circulation flow path, and assumes that the hot water supply operation is performed during the single heating operation. Can be prevented from coming out of the hot water flow path. In addition, a primary hot water circulation passage that serves both as a hot water supply circuit water pipe and a heating circuit heating water pipe is arranged in the primary heat exchanger of one can body, and a single primary is composed of a single combustion burner and a single combustion fan. When the hot water circulation passage is heated and the hot water supply single operation or the heating single operation is performed, it is possible to avoid overheating and boiling of the other pipe that is not operated.

  The sixth invention has a plurality of primary hot water circulation channels, and each primary hot water circulation channel is provided with a primary hot water circulation channel opening / closing valve.

  Then, the primary hot water circulation passage after exiting the primary heat exchanger that is a single can is branched into a plurality of parts, and each primary hot water circulation passage is connected to a secondary hot water circulation passage that is a heating circuit tube. A secondary heat exchanger is provided, and more heat exchange units for heating are provided to improve usability.

  The seventh invention is characterized in that at least one of the plurality of primary hot water circulation passages is branched from the outlet hot water passage.

  And since the temperature of the hot water obtained in the outlet hot water channel branched in the middle of the primary hot water circulation channel is lower than the hot water temperature obtained in the primary hot water circulation channel after leaving the primary heat exchanger, the heating circuit tube It is possible to warm the secondary warm water circulation channel as described above at a lower temperature. In this way, two types of hot water for heating the heating circuit, that is, a high temperature and a low temperature, can be taken out, so that the usability can be improved depending on the use of the heating terminal used.

  The eighth invention utilizes, as means for detecting the water flow at the time of entering water, detecting a pressure drop phenomenon in the hot water flow path when the user opens the hot water tap, and the pressure in the hot water flow path When a drop is detected, the user's use of hot water can be detected.

  The ninth aspect of the invention is a configuration in which a hot water supply tank having a volume in the hot water flow path is arranged, and when it is assumed that the hot water supply operation is performed at the time of heating alone operation, the hot water heater is overheated immediately after being opened. In order to avoid hot water from being discharged, a hot water supply tank having a volume in the hot water flow path is arranged. According to this configuration, when the hot-water tap is “open” during single heating operation, the temperature of the superheated hot water in the primary heat exchanger is relieved in this hot water supply tank, and the superheated hot water flows directly into the hot water flow path. Can be avoided.

  A tenth aspect of the present invention is the arrangement of a fixed bypass flow path having a flow path opening / closing valve separately from the hot water supply bypass flow path. In order to avoid the hot water that is overheated by the hot water being discharged, a fixed bypass passage provided with a channel opening / closing valve is arranged separately from the hot water supply bypass passage. In preparation for the stopper “open”, the flow path on / off valve is set to “open”, and the hot water in the primary heat exchanger is mixed with sufficient tap water when hot water is used during heating operation. Can be prevented from going directly out of the hot water flow path.

(Embodiment 1)
In FIG. 1, a primary hot water circulation channel 2 of a single water pipe is disposed as a main channel inside a primary heat exchanger 1 which is a single can.

  The primary hot water circulation passage 2 has a hot water supply circuit heating water pipe 1a and a heating circuit heating water pipe 1b in the primary heat exchanger 1, and hot water is supplied at the boundary between the hot water supply circuit heating water pipe 1a and the heating circuit heating water pipe 1b. Branches to a hot water flow path 3 for supplying hot water.

  The combustion burner 4 is divided into a plurality of, for example, five burner parts 4a, 4b, 4c, 4d, and 4e, and can be burned in combinations of each part according to the required amount of combustion.

  The fuel gas supply unit 5 includes a gas source solenoid valve 6 that is a gas supply on / off valve, a gas proportional control valve 7 that adjusts the amount of fuel gas to be supplied, and one part (for example, the burner part 2a) of the combustion burner 4. 2), gas flow path opening / closing valves 8A, 8B, 8C and 8D which are opening / closing solenoid valves for supplying fuel gas.

  Here, the amount of fuel gas supplied to each part of the combustion burner 4 is adjusted by a single gas proportional control valve 7. An igniter (not shown) is provided in the burner portion 4 a of the combustion burner 4.

  A hot water supply circuit heating water pipe 1a is provided on the upstream side (right side of the drawing) in the primary heat exchanger 1 and a heating circuit heating water pipe 1b is provided on the downstream side (left side of the drawing). Each portion of the combustion burner 4 is arranged to heat the hot water supply circuit heating water pipe 1a and the heating circuit heating water pipe 1b. The hot water supply circuit heating water pipe 1a and the heating circuit heating The water pipe 1b corresponds to each part of the corresponding combustion burner 4 (for example, as shown in FIG. 1, the hot water supply circuit heating water pipe 1a is the burner part 2a, 2b, 2c part, and the heating circuit heating water pipe 1b is the burner part 2d. 2e portion).

  Hot water heated by the hot water supply circuit heating water pipe 1a upstream of the primary hot water circulation flow path 2 in the primary heat exchanger 1 flows through the hot water supply flow path 3 and is mixed with tap water flowing through the hot water supply bypass flow path 9 to be supplied with hot water. The

  The primary hot water circulation channel 2 is filled with the same tap water as the hot water supply side as the primary hot water, and is conveyed through the primary hot water circulation channel 2 by the primary hot water circulation pump 10. In the primary hot water circulation channel 2, a circulating hot water primary heat exchanger outlet thermistor 11 for detecting the temperature of the hot water after exiting the primary heat exchanger 1, and the primary hot water circulation channel opening and closing as a channel opening / closing valve A check valve 14 is provided to prevent inflow of tap water from the valve 12 and the water inlet channel 13.

  As the primary hot water circulation channel opening / closing valve 12, for example, a configuration of a thermally operated valve that opens and closes a valve by a built-in heater is conceivable.

  The primary warm water heated by the primary heat exchanger 1 exchanges heat with the secondary warm water in the secondary warm water circulation passage 16 by the secondary heat exchanger 15. Here, as the secondary hot water circuit, a hot water heater is assumed that performs heating operation by supplying hot water to a heating terminal such as a bathroom heater / dryer, a hot water air conditioner, and a floor heating hot water mat. This hot water heating apparatus can supply hot water of multiple temperatures according to the needs of the heating terminal to each heating terminal, and here shows a case of taking out two types of hot water temperatures on the high temperature side and the low temperature side. .

  In the gas hot water heater configured as described above, each operation operation of hot water supply single operation, heating single operation, and simultaneous operation thereof will be described below.

  First, the operation will be described with reference to FIG.

  When the gas hot water heater is turned on and is in a standby state in which a command for executing hot water supply operation or heating operation is not input to the control means 17, the incoming water on / off valve 18 and the primary hot water circulation channel on / off valve 12 are in a "closed" state. I keep it.

  Further, the hot water supply bypass control valve 19 of the hot water supply bypass passage 9 is set to “open” at a certain opening (for example, 50%). For example, if the driving actuator of the hot water supply bypass control valve 19 is configured to use a stepping motor controlled by a pulse signal from the control means 17, the gas hot water heater is turned on. In this case, the control means 17 drives the hot water supply bypass control valve 19 to “fully open”, stores the number of drive pulses at that time, and drives the hot water supply bypass control valve 19 with 50% of the drive pulse number at that time. It can be realized by doing.

  When the operation switch of the external input means 20 is “ON” and the user opens the hot water tap in the kitchen or the like, the hot water supply bypass control valve 19 maintains a certain opening (for example, 50%). Water flows in the order of the incoming water flow path 13, the hot water supply bypass flow path 9, and the outgoing hot water flow path 3, and the incoming water flow detection means 21 detects the water flow.

  As the incoming water flow detection means 21, for example, a configuration in which the control means 17 detects the number of rotations of the rotating body provided in the water flow portion according to the water flow rate as a pulse signal is conceivable. The detected pulse signal and the water flow rate have a linear relationship, and when a water flow pulse signal of a certain water flow rate (for example, 3.0 L / min) or more is detected, the incoming water flow path 13, the hot water supply bypass flow path 9, and the outgoing hot water flow are detected. It can be detected that a water flow has occurred in the flow path system of the flow path 3.

  When the water flow detection signal a from the incoming water flow detection means 21 is input to the control means 17, the control means 17 outputs the incoming water on / off valve “open” signal b for opening the incoming water on / off valve 18, and the incoming water on / off valve 18 is “open”.

  For example, a configuration using an electromagnetic valve can be considered as the water inlet on / off valve 18. When the water inlet / outlet valve 18 is “open”, a water flow is generated from the water inlet flow channel 13 to the primary hot water circulation channel 2 in the primary heat exchanger 1, and the water flow is detected by the primary heat exchanger water flow detection means 22. .

  As the primary heat exchanger water flow detection means 22, when a water flow of a certain water flow rate (for example, 1.0 L / min) or more is generated, a magnet-type butterfly switch is activated, and current is supplied to the primary heat exchanger water flow detection means 22. A configuration of a water flow switch that can generate and detect a water flow is conceivable.

  When the water flow is detected by the primary heat exchanger water flow detection means 22 and the water flow detection signal c from the primary heat exchanger water flow detection means 22 is input to the control means 17, the control means 17 is connected to the burner portion 4 a of the combustion burner 4. The igniter provided in the part is sparked, the gas source solenoid valve 6 is set to “open”, the gas source solenoid valve 6 is set to “open”, and the gas source solenoid valve 6 is set to “open”. A gas proportional control valve control signal e for driving the gas proportional control valve 7 is output to a valve opening for supplying the fuel gas amount at the time of initial ignition to control the gas proportional control valve 7 and ignite the combustion burner 4.

  Here, the gas proportional control valve 7 is configured to be able to adjust the valve opening according to the gas proportional valve control signal e from the control means 17. After ignition of the combustion burner 4, the control means 17 calculates the amount of combustion from the detected temperature of the primary heat exchanger input thermistor 24 so that the hot water supply primary heat exchanger outlet thermistor 23 reaches a certain temperature (for example, 55 ° C.). calculate.

  In order to realize the calculated combustion amount, the control means 17 switches the burner parts 4a, 4b, 4c of the combustion burner 4 by opening and closing the gas flow path opening / closing valves 8A, 8B, and a gas proportional control valve. 7 is controlled.

  When the user sets the hot water tap to “closed” and the water flow detection at the incoming water flow detection means 21 becomes zero, the control means 17 sets the gas source electromagnetic valve 7 to “closed” to stop the combustion in the combustion burner 4 and open / close the incoming water. The valve 18 is set to “closed” to prepare for the next operation.

  Next, the operation will be described with reference to FIG.

  In the heating operation, the primary hot water heated by the primary heat exchanger 1 is conveyed through the primary hot water circulation passage 2 by the primary hot water circulation pump 10, and the secondary heat exchanger 15 supplies the secondary hot water in the secondary hot water circulation passage 16. It is performed by exchanging heat with the next warm water.

  Each heating terminal such as a bathroom heater / dryer / hot water air conditioner / floor heating / hot water mat and the control means 17 can normally perform bidirectional signal communication, and each heating terminal is provided with an external input means such as a remote controller. When the user wants to use each heating terminal, each heating terminal operation start command is input from the external input means of each heating terminal, and the command is transmitted to the control means 17 of the gas hot water heater. It is a mechanism to be done.

  The external input means 20 also has a switch for inputting a heating operation start command, and can also input a heating operation start command.

  When the heating operation start is input to the control means 17 by each heating terminal or the external input means 20 as described above, the control means 17 makes the primary hot water circulation flow that opens the primary hot water circulation passage opening / closing valve 12. A path open / close valve “open” signal f is output to set the primary hot water circulation flow path open / close valve 16 to “open”. Assuming that a thermal valve is used as the primary hot water circulation channel opening / closing valve 16, it takes some time (usually about 1 minute) for the heater in the thermal valve to warm up and the valve to actually "open". When a certain time (for example, 1.5 minutes) elapses after the flow path on / off valve “open” signal f is output, the control means outputs the primary hot water circulation pump 10 drive signal g to drive the primary hot water circulation pump 10.

  If the primary hot water circulation flow path opening / closing valve 12 is “open” and the temporary hot water circulation pump 10 is driven, a water flow is generated in the primary hot water circulation flow channel 2, so that the water flow detection signal from the primary heat exchanger water flow detection means 22. When c is input to the control means 17, the combustion burner 4 is ignited as in the case of hot water supply single operation.

  Then, according to the required amount of combustion, the control means 17 opens and closes the gas flow path opening / closing valves 8A, 8B, 8C, 8D, and controls the combustion portions of the burner portions 2a, 2b, 2c, 2d, 2e of the combustion burner 4. The switching and the opening degree adjustment of the gas proportional control valve 7 can be controlled.

  In the case of heating operation, the secondary hot water temperature detected by the circulating hot water secondary heat exchanger outlet thermistor 25 normally requires 80 ° C.

  Therefore, it is necessary to set the primary hot water temperature detected by the circulating hot water primary heat exchanger outlet thermistor 11 to about 90 ° C. and to warm the secondary hot water to 80 ° C. by the secondary heat exchanger 15. Therefore, the combustion amount control in the heating-only operation is performed so that the primary hot water temperature detected by the circulating hot water primary heat exchanger outlet thermistor 11 becomes 90 ° C.

  Then, heat exchange between the primary hot water and the secondary hot water in the secondary heat exchanger 15 proceeds, and the primary hot water temperature detected by the circulating hot water primary heat exchanger outlet thermistor 11 reaches a certain temperature (eg, 93 ° C.). Then, the control means 17 suppresses the combustion amount, and performs the combustion amount control for increasing the combustion amount again when the primary hot water temperature reaches a certain temperature (for example, 85 ° C.).

  In this way, during the heating single operation, the combustion amount control is performed so that the primary hot water temperature detected by the circulating hot water primary heat exchanger outlet thermistor is in a certain temperature range (for example, 85 ° C. to 93 ° C.).

  In addition, as a method of heating the primary hot water at the time of heating independent operation, in a test operation performed when a gas hot water heater is installed, a constant combustion amount (for example, equivalent to 1000 kcal / h) and a certain time (for example, 2 minutes) The primary hot water is heated by combusting, and is calculated from the temperature rise of the primary hot water detected by the primary heat exchanger incoming thermistor 24 or the circulating hot water primary heat exchanger outlet thermistor 11 and stored in the control means 17. When the circulation flow rate of 2 is used, the primary hot water temperature detected by the circulation flow rate and the primary heat exchanger incoming thermistor 24 in order to set the primary hot water temperature detected by the circulation hot water primary heat exchanger outlet thermistor 11 to 90 ° C. It is also possible to calculate the required amount of combustion from the above and perform feedforward control to heat the primary hot water more efficiently.

  When the secondary hot water in which the temperature detected by the circulating hot water secondary heat exchanger outlet thermistor 25 is heated to about 80 ° C. in the secondary heat exchanger 15 is used for a high temperature side heating terminal such as a bathroom heater. It flows through the high temperature hot water flow path 26 and is supplied to the high temperature side heating terminal as it is.

  When the heated secondary hot water is used in a low temperature side heating terminal such as a floor heating hot water mat, it flows through a low temperature bypass passage 28 having a check valve 27 and is conveyed by a secondary hot water circulation pump 29. It is mixed with the low-temperature return warm water after heat exchange at each heating terminal to reach about 60 ° C., flows through the low-temperature warm water channel 30 and is supplied to the low-temperature side heating terminal.

  Here, as a method for setting the temperature of the hot water supplied to the low-temperature side heating terminal to about 60 ° C., the secondary hot water heated to about 80 ° C. and the heating terminal transported by the secondary hot water circulation pump 29 are heated. The flow rate ratio of the low-temperature return warm water after the replacement can be determined to some extent by the channel resistance design. Eventually, the heat exchange at each heating terminal proceeds and the heating operation is stopped when an instruction that each heating terminal determines that combustion is temporarily stopped or a heating operation stop instruction by the user is input to the control means 17.

  Finally, in the case of simultaneous operation in which the hot water supply operation and the heating operation are performed simultaneously, this simultaneous operation includes the case where the heating operation is started when the hot water supply single operation is performed and the case where the hot water supply is performed when the single heating operation is performed. There are two possible cases for starting operation.

  First, the case where the heating operation is started when the hot water supply single operation is performed will be described with reference to FIGS. The details of the hot water supply operation and the heating operation are the same as described above, and will be omitted. When the above-mentioned hot water supply single operation is performed, if the heating operation start is input to the control means 17 by each heating terminal or the external input means 20, the control means 17 opens the primary hot water circulation passage on-off valve “open”. The signal f and the primary hot water circulation pump 18 drive signal g are output, and a water flow is generated in the primary hot water circulation flow path 2, and the simultaneous operation of the hot water supply operation and the heating operation is started.

  During the simultaneous operation, the control means 17 performs combustion by opening and closing the gas flow path opening / closing valves 8A and 8B so that the temperature detected by the hot water supply primary heat exchanger outlet thermistor 23 becomes a certain temperature (for example, 55 ° C.). The hot water supply operation is preferentially performed by controlling the switching of each combustion part of the burner 4a, 4b, 4c and the opening adjustment of the gas proportional control valve 7 of the burner 4.

  In addition, about the heating part, in order to make the temperature of the primary hot water detected by the circulating hot water primary heat exchanger outlet thermistor 23 as high as possible while detecting the temperature of the primary hot water (for example, 90 ° C.), the control means 17 has a gas flow path opening / closing valve. The hot water temperature control of the primary hot water is performed by switching the burners 4d and 4e of the combustion burner 4 by opening and closing the 8C and 8D.

  At this time, since the opening degree of the gas proportional control valve 7 is controlled with priority over the hot water supply operation, the hot water temperature control of the primary hot water can be controlled only by switching the combustion portions of the combustion burners 4d and 4e. That is, the burner unit 4d = fire extinguishing / burner unit 4e = extinguishing, the burner unit 4d = combustion / burner unit 4e = combustion, the burner unit 4d = combustion / burner unit 4e = extinguishing, and the burner unit 4d = extinguishing / burner unit 4e = combustion. Such combustion patterns of the burner portions 4d and 4e of the combustion burner 4 are conceivable.

Here, if more portions of the burner portions 4d and 4e are provided as a combination of the gas flow path on-off valve and the combustion portion of the combustion burner, the amount of combustion can be adjusted more finely. Even in this case, the temperature of the primary hot water detected by the circulating hot water primary heat exchanger outlet thermistor 23 can be controlled with higher accuracy.
When the hot water supply operation is completed during the simultaneous operation, an operation for controlling the temperature of the primary hot water is performed by the circulating hot water primary heat exchanger outlet thermistor 11 as in the case of the above-described single heating operation.

  Next, the case where the hot water supply operation is started when the heating independent operation is performed will be described with reference to FIGS. When heating is performed alone, the primary hot water circulation passage 2 in the primary heat exchanger 1 may be at a high temperature of about 90 ° C., and the user sets the hot water tap to “open” in the kitchen or the like. Immediately after, hot water comes out and a dangerous situation is considered.

  If the water inlet / outlet valve 18 is eventually opened and water is supplied to the primary heat exchanger as in the above-described hot water supply single operation, the danger of this high temperature hot water supply is eliminated. In the same manner as in the above-described single heating operation, it is assumed that the hot water supply operation is always started when the heating operation is being performed. When the start of the heating operation is input, the control means 17 keeps the hot water supply bypass control valve 19 fully open.

  For example, the control means 17 fully opens the hot water supply bypass control valve 19 for a predetermined time (for example, 5 seconds) after the user “opens” the hot water tap and detects the water flow detection signal a from the incoming water flow detection means 21. Control to keep the state.

  As a result, the hot water heated in the primary heat exchanger 1 is mixed with a sufficient amount of tap water, so that hot hot water immediately after the hot-water tap “open” can be avoided. Here, as a method for determining the time for releasing the hot water supply bypass control valve 19 from the fully open state, the control means 17 outputs a water inlet on / off valve “open” signal b for opening the water inlet on / off valve. Time (for example, 5 seconds), or a difference between the temperature detected by the primary heat exchanger incoming water thermistor 24 and the temperature detected by the incoming water temperature thermistor 31 is, for example, within 3K for a predetermined time (for example, 3 seconds).

  In this way, when the heating single operation is performed, the control means 17 always performs control to keep the hot water supply bypass control valve 19 in a fully opened state, and the hot water heated by the primary heat exchanger 1 with a sufficient flow rate of tap water. By mixing the hot water, the danger of hot hot water heated in the primary heat exchanger 1 being directly discharged is avoided. Then, after the hot water supply bypass control valve 19 is released from the fully open state, the hot water supply operation is preferentially controlled as in the case of the simultaneous operation in which the heating operation is started during the hot water supply single operation described above.

  As described above, according to the configuration and the control method of the present embodiment in which the primary hot water circulation channel 2 of the single water pipe is disposed as the main channel inside the primary heat exchanger 1 that is a single can body, the configuration is a conventional configuration. In the configuration in which the two water pipes are arranged in one can, it is possible to avoid the phenomenon that the other water pipes are overheated or boiled when the hot water supply single operation or the heating single operation is performed.

  In FIGS. 1 to 3, reference numeral 32 denotes a combustion fan for supplying combustion air.

(Embodiment 2)
FIG. 4 shows a second embodiment, in which a water pipe for heating a hot water supply circuit of the primary heat exchanger 1 described in the first embodiment is used as a plurality of fuel gas supply passages whose fuel gas amounts are adjusted by respective gas proportional control valves. Two are provided so as to correspond to 1a and the water pipe 1b for heating circuit heating.

  In FIG. 4, the difference from Embodiment 1 is that the primary hot water circulation passage 2 that is a heating circuit heating water pipe is configured on the downstream side of the primary heat exchanger 1 that is a single can. Also in the fuel gas supply unit 5, two fuel gas supply channels including a gas proportional control valve 7 </ b> B and a gas proportional control valve 7 </ b> A so as to correspond to the upstream part and the downstream part of the primary heat exchanger 1, respectively. A gas passage opening / closing valve 8A for opening and closing these two fuel gas supply passages is provided.

  In the gas hot water heater configured as described above, each operation of hot water supply single operation, heating single operation, and simultaneous operation thereof will be described below.

  First, in the case of a single hot water supply operation, when the user opens the hot water tap, a water flow is generated in the hot water flow path 3 and the water flow is detected by the incoming water flow detection means 21, as described in the first embodiment. The control means 17 performs the ignition operation of the combustion burner 4.

  In FIG. 4, an igniter is provided in the burner portion 2c of the combustion burner 4, and the proportional control of the fuel gas supply amount is performed by the gas proportional control valve 7B.

  And the combustion part of burner part 4a, 4b, 4c is switched by opening and closing of gas flow-path opening-and-closing valve 8B, 8C.

  Note that the gas flow path opening / closing valve 8A is kept in the “closed” state during the hot water supply single operation. Further, the hot water temperature control of the hot water supply is the same as that of the first embodiment, and is omitted.

  Next, in the case of heating independent operation, when the heating operation start is input to the control means 17 by each heating terminal or the external input means 20, the control means 17 causes the primary hot water circulation flow as described in the first embodiment. When the path open / close valve 12 is set to “open”, the primary hot water circulation pump 10 is driven and the water flow is detected by the primary hot water circulation passage water flow detection means 32, the combustion burner 4 is ignited.

  Here, the primary hot water circulation passage water flow detection means 32 has the same configuration as the primary heat exchanger water flow detection means. In FIG. 4, an igniter is provided in the burner portion 4d of the combustion burner 4, and the control means 17 performs proportional control of the fuel gas supply amount by the gas proportional control valve 7A. And the combustion part of the burner parts 2d and 2e is switched by opening and closing of the gas flow path on-off valve 8D.

  Note that the gas passage opening / closing valve 8A is kept in the “closed” state during the heating independent operation. The hot water temperature control for heating is the same as that in the first embodiment, and is omitted.

  Finally, it is the case of simultaneous operation in which hot water supply operation and heating operation are performed simultaneously. This simultaneous operation includes the case of starting the heating operation when performing hot water single operation and the case of performing hot water operation when performing single heating operation. There are two possible ways to start.

  First, in the case where the heating operation is started when the single hot water supply operation is performed, as described in the single hot water supply operation of the second embodiment, the gas flow path opening / closing valve 8A is “closed” during the single hot water supply operation. In this state, the fuel gas supply amount is performed by the gas proportional control valve 7B on the hot water supply side. In this state, when each heating terminal or external input means 20 inputs the start of heating operation to the control means 17, the control means 17 opens the gas flow path opening / closing valve 8A and supplies fuel gas to the heating side. .

  During the simultaneous operation, the hot water temperature control priority operation is performed as described in the first embodiment, and the fuel gas flow rate is controlled by the previously operated gas proportional control valve 7B.

  In this configuration, the hot water temperature control on the heating side can be controlled only by switching the burner portions 4d and 4e of the combustion burner 4. That is, the combustion pattern of the burner parts 4d and 4e of the combustion burner 4 such as burner part 4d = combustion / burner part 4e = fire extinguishing and burner part 4d = combustion / burner part 4e = combustion by opening and closing the gas flow path opening / closing valve 8D. Can be considered.

  The combustion portion of the combustion burner 4 is selected as described above, and control is performed so that the temperature detected by the circulating hot water primary heat exchanger outlet thermistor 11 is as optimal as possible.

  Next, in the case where the hot water supply operation is started when the single heating operation is performed, as described in the single heating operation of the second embodiment, the gas flow path opening / closing valve 8A is “closed” during the single heating operation. In this state, the fuel gas supply amount is performed by the gas proportional control valve 7A on the heating side.

  In this state, when the user opens the hot-water tap and starts the hot water supply operation, the control means 17 sets the gas passage opening / closing valve 8A to “open” and supplies fuel gas to the hot water supply side. Here, unlike the case of the first embodiment, the primary hot water circulation flow path 2 is formed on the downstream side of the primary heat exchanger 1, and therefore there is no overheated hot water in the hot water flow path 6 portion. The danger of hot hot water being discharged temporarily when the hot-water tap is “open” can be avoided. When the hot water supply side is ignited, the hot water supply priority operation is performed as described in the first embodiment.

  As described above, the primary hot water circulation flow path 15 that is a heating circuit heating water pipe is configured in the downstream portion of the primary heat exchanger 1 that is a single can body, and operates on either the hot water supply side or the heating side. According to the configuration in which combustion control is performed by the gas proportional control valve, when hot water supply operation is started during heating single operation, high-temperature hot water that has been temporarily overheated from the hot water outlet passage 6 immediately after the hot-water tap "opens". The risk of coming can be avoided. Similarly to the case of the first embodiment, in the heat exchanger configuration in which two water pipes are arranged in a single can body, which is a conventional configuration, the other water pipes in the case of performing a single hot water supply operation or a single heating operation are overheated and boiled. Can be avoided.

(Embodiment 3)
FIG. 5 shows a configuration of a gas hot water heater in Embodiment 3 of the present invention. In FIG. 5, the difference from Embodiments 1 and 2 is that the secondary hot water circulation passage 2 is branched into a plurality of primary hot water circulation passages 2 after exiting the primary heat exchanger 1 that is a can, and the secondary hot water is a heating circuit tube. The secondary heat exchanger 15 of the circulation channel 32 is provided, and more heating heat exchange units are provided to improve usability. Here, two cases are considered as a plurality of primary hot water circulation channels 2, and one of them is assumed to be used for heating a bath circuit. Moreover, the part of the primary heat exchanger 1 is shown in the configuration of the first embodiment.

  Here, when the bath is recharged, when the user inputs a bath reheating operation start command from the external input means 20, the control means 17 sets the primary hot water circulation passage opening / closing valve 12B to "open", and the heating independent operation is performed. Start.

  And in the secondary heat exchanger 15, heat exchange is performed between the primary warm water and the secondary warm water circulation channel 33 through which the bath circulation water as the secondary warm water flows, and the bath circulation water is heated. Here, when the bath reheating operation is performed independently, the temperature detected by the circulating hot water primary heat exchanger outlet thermistor 11 is, for example, 60 ° C. because a high temperature that heats the heating terminal is not necessary. In addition, the combustion control of heating single combustion is performed.

  In the case where the heating operation for heating the heating terminal and the bath reheating operation for heating the bath circulating water are performed simultaneously, the temperature detected by the circulating hot water primary heat exchanger outlet thermistor 11 is a predetermined temperature (for example, 90 ° C. ) To be preferentially controlled.

  And when performing a hot water supply operation further, control which performs a hot water supply operation with the highest priority is performed. In the configuration shown in FIG. 5, a hot water solenoid valve 34 is provided from the hot water flow path 3 to the bath circuit, and when the user inputs a hot water pouring operation by the external input means 20, the hot water supply operation is performed. It is possible to “open” the hot water solenoid valve 34 by using the hot water to pour the hot water amount and water level specified by the user and the hot water.

  As described above, the primary hot water circulation flow path 2 is branched into a plurality of parts, each provided with the secondary heat exchanger 15 with the secondary hot water circulation flow path 33 which is a heating circuit tube, and more heat exchange parts for heating are provided. By using the configuration, the usability can be improved. Similarly to the case of the first embodiment, in a configuration in which two water pipes are arranged in a single can body, which is a conventional configuration, a phenomenon in which other water pipes are overheated or boiled when hot water single operation or heating single operation is performed is avoided. can do.

(Embodiment 4)
FIG. 6 shows a configuration of a gas hot water heater in Embodiment 4 of the present invention. In FIG. 6, the difference from the third embodiment is that at least one of the plurality of primary hot water circulation channels 2 is branched from the hot water flow channel 3.

  Here, two primary hot water circulation channels 2 are assumed, and one is assumed as one of the primary hot water circulation channels 2 branched from at least one hot water flow channel 3, and the primary hot water branched from the hot water flow channel 3 is assumed. The circulation channel 2B is used to heat the secondary hot water circulation channel 33 which is a bath circuit.

  When the secondary hot water circulation passage 33 that is a bath circuit is heated in a configuration in which the primary hot water circulation passage 2 that has come out of the primary heat exchanger 1 as described in the third embodiment is branched, the bath alone is replaced. In the case of carrying out a fired operation, combustion control can be performed to set the circulating hot water primary heat exchanger outlet thermistor 11 to 60 ° C. However, when heating operation and hot water supply operation are performed simultaneously, as described in the third embodiment. The chasing operation of the bath is affected by it and the usability becomes worse.

  However, according to the configuration in which the primary hot water circulation flow path 2B for heating the bath circuit is branched from the hot water flow path 3 as in the present embodiment, the hot water supply primary heat exchanger outlet is used when the bath reheating operation is performed independently. Combustion control is performed so that the temperature detected by the thermistor 23 is 60 ° C., and when the heating operation is performed simultaneously, the heating operation is prioritized so that the temperature detected by the circulating hot water primary heat exchanger outlet thermistor 11 is 90 ° C. When combustion control is performed simultaneously with the hot water supply operation, the temperature detected by the hot water supply primary heat exchanger outlet thermistor 23 can be controlled to be 60 ° C.

  Therefore, with regard to the bath rebirth operation, the bath rebirth operation can be performed more optimally than in the third embodiment, and the usability can be improved. Similarly to the case of the first embodiment, in a configuration in which two water pipes are arranged in a single can body, which is a conventional configuration, a phenomenon in which other water pipes are overheated or boiled when hot water single operation or heating single operation is performed is avoided. can do.

(Embodiment 5)
In FIG. 7, the difference from Embodiment 1 is that as a means for detecting the water flow at the time of entering water, it is used to detect the pressure drop phenomenon of the hot water flow path 3 when the user opens the hot water tap. It is conceivable to use a pressure sensor as the detection means 34. When the user opens the hot water tap and the internal pressure in the hot water flow passage 3 detected by the pressure sensor decreases, the control means 17 can detect the use of the hot water by the user. Similarly to the case of the first embodiment, in the configuration in which the two water pipes are arranged in the can body, which is a conventional configuration, the phenomenon of overheating and boiling of the other water pipes when the hot water supply single operation or the heating single operation is performed is avoided. be able to.

(Embodiment 6)
8 differs from the first embodiment in that a hot water supply tank 35 having a volume in the hot water flow path 3 is arranged. According to this configuration, when the hot-water tap is “open” during the heating-only operation, the temperature of the superheated hot water in the primary heat exchanger 1 is relaxed in the hot water supply tank 35, and the heated hot water is directly discharged. Exiting from the flow path 3 can be avoided. Moreover, in the structure which has arrange | positioned the two water pipes in the can body which is the conventional structure, the other water pipe at the time of performing only hot water supply independent operation or heating independent operation can avoid the phenomenon of overheating and boiling.

(Embodiment 7)
9 differs from the first embodiment in that a fixed bypass flow path 37 having a flow path opening / closing valve 36 is arranged separately from the hot water supply bypass flow path 9. In preparation for “open”, the flow path opening / closing valve 36 is set to “open”, and the hot water in the primary heat exchanger 1 is mixed with sufficient tap water at the time of using hot water during heating operation. It is possible to avoid the hot water coming out of the hot water flow path 3 directly.

  Here, as the flow path opening / closing valve 36, a configuration of an opening / closing electromagnetic valve is conceivable. Thereafter, after the passage of time as described in the first embodiment, the flow path opening / closing valve 36 is set to “closed”, and the hot water supply bypass control valve 19 performs hot water temperature control.

  Moreover, in the structure which has arrange | positioned the two water pipes in the can body which is the conventional structure, the other water pipe at the time of performing only hot water supply independent operation or heating independent operation can avoid the phenomenon of overheating and boiling.

As described above, according to the gas hot water heater according to the present invention,
It can avoid overheating and boiling in the tube, and can be applied to a water heater having two functions of heating and hot water supply.

The block diagram of the gas hot-water heater in Embodiment 1 of this invention The block diagram which shows the control action at the time of hot water supply independent operation of the gas hot water supply heater The block diagram which shows the control action at the time of heating independent operation of the gas hot-water supply heater The block diagram of the gas hot-water heater in Embodiment 2 of this invention The block diagram of the gas hot-water heater in Embodiment 3 of this invention The block diagram of the gas hot-water heater in Embodiment 4 of this invention The block diagram of the gas hot-water heater in Embodiment 5 of this invention The block diagram of the gas hot-water heater in Embodiment 6 of this invention The block diagram of the gas hot-water heater in Embodiment 7 of this invention Configuration diagram of conventional gas hot water heater

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Primary heat exchanger 1a Hot water supply circuit heating water pipe 1b Heating circuit heating water pipe 4 Combustion burner 9 Hot water supply bypass flow path 31 Incoming temperature thermistor 21 Incoming water flow detection means 19 Hot water supply bypass control valve 18 Incoming water on-off valve 23 Hot water supply primary heat exchanger outlet Thermistor 12 Primary hot water circulation passage opening / closing valve 14 Check valve 10 Primary hot water circulation pump 16 Secondary hot water circulation passage 15 Secondary heat exchanger 17 Control means 34 Pressure drop detection means 35 Hot water tank 36 Flow passage opening / closing valve 37 Fixed bypass Flow path

Claims (10)

A primary heat exchanger in which a hot water supply circuit heating water pipe and a heating circuit heating water pipe are formed by a single water circulation passage pipe in a single heat exchanger, and a secondary heat exchange for heating from the outlet of the single water circulation passage pipe A primary hot water circulation path that is connected to the inlet of the single water circulation flow path pipe through a vessel to form a closed circuit, and a hot water supply flow path that branches from the middle of the single water circulation flow path to form a hot water supply outlet, A hot water supply operation using the hot water flow path, a heating operation using the secondary heat exchanger, or the hot water flow path and a secondary heat exchanger, comprising a burner and a combustion fan for heating the primary heat exchanger Gas water heater / heater that is configured to perform simultaneous operation using a gas generator. A primary heat exchanger that heats a single water pipe in a single can, a single combustion burner that heats the primary heat exchanger, and a single gas proportional control valve control the amount of fuel gas supplied to multiple gas supply channels. A fuel gas supply unit, a single combustion fan for supplying combustion air to the combustion burner, a water inlet passage through which the supply water flows, a hot water outlet passage through which hot water heated by the primary heat exchanger flows, A hot water supply bypass flow path that branches from the water flow path and enters the hot water flow path, an incoming water temperature thermistor that detects the incoming water temperature, a hot water temperature thermistor that detects the hot water temperature, an incoming water flow detection means that detects the water flow at the time of incoming water, A hot water supply bypass control valve that adjusts the opening degree of the hot water supply bypass flow path, a water supply on / off valve that feeds supply water to the primary heat exchanger, and a hot water supply primary heat exchanger outlet thermistor that detects the temperature of hot water that has exited the primary heat exchanger And merged with the incoming water flow path A primary warm water circulation channel that branches off, a primary warm water circulation channel on-off valve that opens and closes the primary warm water circulation channel, a check valve that prevents back flow from the incoming water flow channel to the primary warm water circulation channel, and primary warm water circulation A primary hot water circulation pump for conveying hot water in the flow path, a primary heat exchanger water flow detecting means for detecting the water flow to the primary heat exchanger, and an incoming water temperature supplied to the primary heat exchanger are detected. A primary heat exchanger incoming thermistor, a circulating hot water primary heat exchanger outlet thermistor that detects the circulating hot water temperature exiting the primary heat exchanger, a secondary hot water circulation passage through which the secondary hot water flows, and a primary hot water circulation passage. Equipped with a secondary heat exchanger that exchanges heat between the secondary hot water circulation channels and a control means that controls these operations, hot water supply alone operation, operation that exchanges heat with the secondary heat exchanger alone , And gas water heaters that operate them simultaneously. A primary heat exchanger in which a hot water supply circuit heating water pipe and a heating circuit heating water pipe are formed by a single water circulation passage pipe in a single heat exchanger, and a secondary heat exchange for heating from the outlet of the single water circulation passage pipe A primary hot water circulation path that is connected to the middle of the single water circulation flow path pipe through a vessel to form a closed circuit, a hot water supply flow path that branches off from the middle of the single water circulation flow path to form a hot water supply outlet, A hot water supply operation using the hot water flow path, a heating operation using the secondary heat exchanger, or the hot water flow path and a secondary heat exchanger, comprising a burner and a combustion fan for heating the primary heat exchanger Gas water heater / heater that is configured to perform simultaneous operation using a gas generator. The gas hot water heater according to claim 3, wherein the primary hot water circulation path and the single water circulation path pipe are connected downstream of the hot water supply circuit heating water pipe of the primary heat exchanger and upstream of the heating circuit heating water pipe. . A primary heat exchanger that heats a single water pipe in a single can, a combustion burner that heats the primary heat exchanger, a plurality of fuel gas supply passages whose fuel gas amounts are adjusted by each gas proportional control valve, and their fuel A fuel gas supply section composed of a gas flow path opening / closing valve that opens and closes the gas supply flow paths, a single combustion fan that supplies combustion air to the combustion burner, an inlet flow path through which supply water flows, and a primary A hot water flow path through which hot water heated by the heat exchanger flows, a hot water supply bypass flow path that branches from the incoming water flow path and enters the hot water flow path, an incoming water temperature thermistor that detects the incoming water temperature, and a hot water temperature that detects the hot water temperature A thermistor, an incoming water flow detecting means for detecting the water flow at the time of incoming water, a hot water supply bypass control valve for adjusting the opening degree of the hot water supply bypass flow path, and a hot water supply primary heat exchanger for detecting the temperature of hot water discharged from the primary heat exchanger Of the outlet thermistor A primary hot water circulation channel connected to the single water pipe of the primary heat exchanger downstream from the bifurcation, a primary hot water circulation channel on-off valve that opens and closes the primary hot water circulation channel, and an inlet water channel to the primary hot water circulation channel A check valve for preventing backflow, a primary hot water circulation pump for conveying hot water in the primary hot water circulation channel, and a primary hot water circulation channel water flow detecting means for detecting the water flow in the primary hot water circulation channel; A circulating hot water primary heat exchanger outlet thermistor that detects the circulating hot water temperature exiting the primary heat exchanger, a secondary hot water circulation channel through which the secondary hot water flows, a primary hot water circulation channel, and a secondary hot water circulation channel. A secondary heat exchanger that exchanges heat between them and a control means that controls these operations, and performs hot water supply single operation, single heat exchange operation in the secondary heat exchanger, and simultaneous operation thereof Perform gas hot water heater. The gas hot-water heater according to any one of claims 1 to 5, further comprising a plurality of primary hot water circulation channels, wherein each primary hot water circulation channel includes a primary hot water circulation channel opening / closing valve. The gas hot-water heater according to claim 6, wherein at least one of the plurality of primary hot water circulation channels branches from the hot water flow channel. The gas hot water heater according to any one of claims 1 to 5, further comprising a pressure drop detection means for detecting a pressure drop in the hot water flow path as a means for detecting a water flow at the time of entering water. The gas hot-water heater of any one of Claims 1-5 of the structure which has arrange | positioned the hot-water supply tank which has a volume in a hot water flow path. The gas hot water heater according to any one of claims 11 to 5, wherein a fixed bypass passage provided with a passage opening / closing valve is arranged separately from the hot water supply bypass passage.

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