JP4101843B2 - Heat source device and control method thereof - Google Patents

Description

The present invention relates to a heat source device that realizes versatility such as heating, hot water supply, bath tub retreat, and the like by a single heat source, and a control method thereof.

A hot water supply apparatus that uses combustion heat of gas, oil, or the like as a heating source is used for the hot water and bath water. In addition, a heating apparatus using hot water obtained by a hot water supply apparatus as a heating heat source has been put into practical use. As a hot water supply device using both hot water supply and bath tub retreat, there is JP-A-57-184850 “hot water supply device equipped with a bath renewal device”, etc., which is divided into a boiler for circulating hot water and a circulation line. A heat exchanger for hot water supply and a heat exchanger for reheating are respectively arranged, the distribution valve is operated, hot water is supplied to the heat exchanger for hot water supply or reheating, and hot water supply or heating is operated independently. It ’s just that. Japanese Patent Application Laid-Open No. 11-108442 “Combustion device” and the like are a combination of heating and hot water supply. This is a hot water supply device that heats clean water with a heat exchanger and circulates a part of it. A heating heat exchanger and a heat exchanger for heating are installed in the hot water supply circuit, and the amount of heat of the clean water is reduced. It can be used for heating and memorial.
JP-A-57-184850 JP-A-11-108442

  By the way, in order to realize heating, hot water supply, bath tub retreat, etc., a heat exchanger, a combustor, a fan motor and other attached devices are installed, and the pipeline for linking heating, hot water supply and retreat is complicated. . For this reason, the hot water supply facilities are increased in size and weight, and it is necessary to secure an installation space and work by a plurality of workers.

  In response to such a request, the present inventor has proposed a heat source device that realizes multi-purpose and multi-functionality such as heating, hot water supply, bath tub retreat, etc. with a single heat source while simplifying the heat source and piping configuration. is doing.

Therefore, purpose of the present invention relates to such a heat source device, it is to prevent the abnormal operation of the continuous mixing valve for mixing the hot water and water tapping side.

To achieve the above Symbol object, a first aspect of the present invention includes a tank for storing the heating medium, and heating load for circulating the heating medium, comprising a first on-off valve, the first on-off valve is opened The heat medium is circulated from the tank to the heating load and returned to the tank, the heat source, and the heat medium connected to the main circuit is circulated to heat the heat source to the heat. A first heat exchanging means for exchanging heat with the medium; a second on-off valve branched from the outlet side of the first heat exchanging means of the main circuit and directly connected to the tank; When the valve is opened, the heating medium flows from the main circuit and is returned to the tank, and the hot water supply and heating circuit is connected to the hot water supply and heating circuit, and the heat of the heating medium flowing through the hot water supply and heating circuit is heated. A second heat exchanging means for exchanging heat with water and a branch from the outlet side of the first heat exchanging means of the main circuit And a third on-off valve directly connected to the tank, and when the third on-off valve is opened, the heating medium flows from the main circuit and returns to the tank. A third heat exchanging means connected to the additional heat circuit and exchanging heat of the heat medium flowing through the additional heat circuit to the bath water; and the main heat input side of the first heat exchanging means. A pump installed in a circuit for flowing the heating medium of the tank to the main circuit side, a mixing valve for mixing the hot water and hot water heated by the second heat exchange means, and a mixing valve Detection means for detecting an operation abnormality and a heating request, a hot water supply request or a bath water heating request, the first on-off valve by a heating request, the second on-off valve by a hot water request, and the third on by a bath water heating request. Open the on-off valve and drive the pump, and the first on-off valve The heating medium of the tank is flowed to the heating load through the first heat exchange means in the main circuit, and when the second on-off valve is opened, the heating medium of the tank is When the third on-off valve is opened, the heat medium in the tank is transferred to the first heat exchange means through the first heat exchange means in the main circuit. Flowing through the heat exchange means to the third heat exchange means and returning it to the tank, the amount of heat required by the heating request, the hot water supply request and the bath water heating request is obtained, and the rotation speed of the pump is determined according to the amount of heat. And when the detection means detects an abnormal operation of the mixing valve, any one of the circulation operation of the heating medium, the heating operation of the heat source , or the hot water operation for the second heat exchange means Or stop two or more actions It is to comprise a that control means.

In order to achieve the above object, a second aspect of the present invention includes a tank for storing a heat medium, a heating load for circulating the heat medium, and a first on-off valve, When opened, the heating medium is circulated from the tank to the heating load, returned to the tank, a main circuit, a heat source, connected to the main circuit, the heating medium is circulated, and the heat of the heat source is A first heat exchanging means for exchanging heat with the heat medium; a second on-off valve branched from the outlet side of the first heat exchanging means of the main circuit and directly connected to the tank; When the on-off valve is opened, the heating medium flows from the main circuit and is returned to the tank.The hot water heating circuit is connected to the hot water heating circuit, and the heat of the heating medium flowing through the hot water heating circuit is A second heat exchanging means for exchanging heat with hot water, and an outlet side of the first heat exchanging means of the main circuit. A third on-off valve that is branched and directly connected to the tank, and when the third on-off valve is opened, the heating medium flows from the main circuit and returns to the tank; Third heat exchange means connected to the additional heat circuit and exchanging heat of the heat medium flowing through the additional heat circuit to bath water, and the inlet side of the first heat exchange means A pump installed in the main circuit to flow the heating medium of the tank to the main circuit side, a mixing valve for mixing the hot water and hot water heated by the second heat exchange means, and the mixing valve Control of the heat source device, including detection means for detecting an operation abnormality of the first and second on-off valves, the second on-off valve, the third on-off valve, driving of the pump, and control means for controlling the pump a method, heating demand, receiving the hot water demand or bath water heating demand, the heating demand When the first on-off valve is opened, the second on-off valve is opened by a hot water supply request, the third on-off valve is opened by a bath water heating request, the pump is driven, and the first on-off valve is opened. The heating medium in the tank is in the main circuit when the second on-off valve is opened by flowing the heating medium in the tank to the heating load through the first heat exchange means in the main circuit. When flowing through the first heat exchanging means to the second heat exchanging means, and the third on-off valve is opened, the heat medium in the tank is passed through the first heat exchanging means in the main circuit. While flowing to the third heat exchange means and returning to the tank, the amount of heat required by the heating request, the hot water supply request, and the bath water heating request is obtained, and the rotation speed of the pump is controlled according to the amount of heat. , The detecting means operates the mixing valve When an abnormality is detected, the circulating operation of the heating medium to the second heat exchange means, heating operation of the heat source, or it include any operation or processing for stopping the two or more operations of pouring operation .

According to the first or second aspect of the present invention, it is possible to prevent continuation of abnormal operation due to a failure of a mixing valve that mixes water and hot water.

  Embodiments of the present invention will be described in detail with reference to examples shown in the drawings.

  FIG. 1 shows an embodiment of a heat source device of the present invention. The heat source device is provided with a heat source device 2, a heating circuit 4 that supplies heat to the heating load 3, a hot water supply circuit 6 that performs hot water heating such as general hot water supply, and bathtub water (= BR, BG) of the bathtub 94 The heating circuit 4 of this embodiment is a circulation path for circulating hot water 10 (= KW, OW) as a heating medium, and the hot water 10 flowing through this circulation path is provided. Is the heat source on the hot water supply circuit 6 and bath circuit 8 side.

  A single heat source 11 is installed in the heat source device 2, and for this heat source 11, for example, combustion heat of a burner that burns oil or fuel gas, electric heat, or exhaust heat of an engine or a fuel cell is used. For example, when a burner is used as the heat source 11, the amount of combustion of the fuel gas can be adjusted by supplying the burner.

  The heating circuit 4 is provided with a heating heat exchanger 21 as a first heat exchanging means for exchanging heat between the heat of the heat source 11 and the hot water 10, and an expansion tank 26 as a heat accumulating means and a pressure feeding means. A circulation pump 28 is installed. The heat exchanger 21 may use a latent heat recovery heat exchanger in combination with a sensible heat recovery heat exchanger for combustion gas. The circulation pump 28 has its pump rotation speed controlled stepwise or continuously according to the heating demand.

  The heating circuit 4 includes a main circuit 30 for flowing the hot water 10 to the heating load 3 side, a hot water supply / heating circuit 32 for heating the hot water W for hot water supply, an additional heating circuit 34 for heating the bath water, and the like. . The heating load 3 that receives the supply of the hot water 10 from the main circuit 30 is provided with a high temperature heating load 3A that receives the supply of the high temperature water HD and a low temperature heating load 3B that receives the supply of the low temperature water LD. The heating load 3B has a single or a plurality of load configurations. High temperature water HD is directly sent to the high temperature heating load 3A through the open / close valve 35, but the low temperature heating load 3B is supplied with the hot water 10 on the side of the expansion tank 26 flowing through the bypass pipe 44 and the high temperature distributed through the branch pipe 48. Low temperature water LD obtained by joining the water HD is supplied through the on-off valve 37. The bypass pipe 44 is provided with a low temperature adjustment valve 62 that adjusts the supply amount of the hot water 10. Then, the hot water DB circulated through the heating load 3 is returned to the expansion tank 26.

  The hot water supply and heating circuit 32 is a circuit that is branched from the outlet side pipe of the heat exchanger 21 and circulates the hot water supply heat exchanger 66 that is the second heat exchange means to flow the high-temperature water HD to the expansion tank 26. In addition, a distribution valve 68 or the like is provided as means for distributing or switching the high-temperature water HD.

  The reheating heat circuit 34 is a circuit that branches from the outlet side pipe of the heat exchanger 21 and circulates a reheating heat exchanger 72 that is a third heat exchanging means to return it to the expansion tank 26. In addition, an on-off valve 74 is provided as a means for distributing or switching the high-temperature water HD. The heat exchanger 72 is a heat exchanger in which a spiral primary side pipe is installed in a cylindrical container to which a secondary side pipe is connected, and hot water 10 as a heat medium is caused to flow through the spiral pipe. Exchanges heat with the bath water flowing around. That is, the distribution valve 68 and the on-off valve 74 constitute switching means for switching the heat supply to the heating circuit 4, the hot water supply circuit 6, or the bath circuit 8.

  Moreover, the hot water supply circuit 6 is a circuit independent of the heating circuit 4, and flows hot water W through the heat exchanger 66 and heats it by heat exchange with the high temperature water HD as a heat medium, and as a high temperature water HW, a hot water tap Let hot water supply from etc.

  Moreover, the bath circuit 8 constitutes a circuit independent of the heating circuit 4, operates the circulation pump 100 to guide the bathtub water stored in the bathtub 94 from the bathtub 94 to the heat exchanger 72, and generates a high temperature as a heat medium. It is a circuit that returns to the bathtub 94 after heating by heat exchange with the water HD. A hot water supply pipe 108 is connected between the bath circuit 8 and the hot water supply circuit 6 via a switching valve 106, and hot water is supplied from the hot water supply circuit 6 to the bathtub 94.

  The operation and features of this heat source device are listed as follows.

a. Basic operation of heat source apparatus As shown in the flowchart of FIG. 2, when there is an operation request (S201), current heat amount calculation is performed (S202), then necessary heat amount calculation is performed (S203), and the current heat amount and required heat amount are calculated. It is determined whether or not there is a difference between (S204). After the pump speed required for the circulation pump 28 is set in accordance with this heat amount difference (S205), for example, combustion control is performed as heat amount control of the heat source 11 (S206).

b Hot Water Supply Single Operation Calculates the required heat quantity from the incoming water temperature, the hot water supply flow rate and the set temperature, and as shown in FIG. 3, obtains the pump rotation speed of the circulation pump 28 that provides the required flow rate for realizing the required hot water supply heat quantity, and obtains the data Store in the storage means. Based on the data, the pump rotational speed required for the required amount of hot water supply is controlled, and even during continuous combustion, the incoming water temperature, flow rate, and hot water temperature are constantly monitored, and the pump rotational speed for obtaining the required heat quantity is maintained.

  Then, the hot water supply heat receiving side adjusts the flow rate so that the tapping temperature etc. reaches the set temperature.

  In this case, if the hot water 10 in the expansion tank 26 is heated to a constant temperature and maintained at a constant temperature, it can be used as a heat medium, and the heating rate of hot water supply (immediate hot water property) can be improved. That is, when waiting for a rise in the water temperature in the heat exchanger 66 after starting combustion, it takes a certain amount of time to obtain hot water of a predetermined temperature, but if the hot water temperature in the expansion tank 26 is kept high. The start-up time to the desired hot water supply temperature can be shortened by utilizing the amount of heat.

c Heating Single Operation FIG. 4 shows the number of terminals requiring heating, the amount of heat required for heating, and the number of rotations of the circulation pump 28. Therefore, the number of heating operation requests and the amount of heat required for heating from the heating terminal, that is, the remote control device on the side of the heating load 3 are confirmed, and the rotation speed of the circulation pump 28 is changed from the heat amount data.

d Remembrance single operation When there is a renewal request, the on-off valve 74 is opened and the hot water 10 (OW) is allowed to flow to the heat exchanger 72 side to exchange heat between the hot water 10 and the bath water. In this case, the rotational speed of the circulation pump 28 is maintained at a predetermined rotational speed at which a predetermined amount of heat is obtained. In this case, when the heat exchange amount is low depending on the construction conditions, for example, the rotation number of the circulation pump 28 may be changed by the control means to increase the heat exchange amount.

e Simultaneous operation operation of hot water supply, heating and renewal In simultaneous operation operation of hot water supply, heating and renewal, necessary pump rotation speed data for the required heat quantity in that case is obtained in advance, for example, as shown in FIG. In addition, the number of revolutions of the pump is controlled so that the necessary amount of heat is obtained. The calculation of the required heat quantity in this case can be calculated | required by formula (1) mentioned later, for example.

f Insulation operation The insulation of the warm water 10 in the expansion tank 26 is performed by operating the circulation pump 28 as shown in the flowchart of FIG. 6 (S301), and the outlet temperature of the heat exchanger 21 is a predetermined temperature, for example, 80 ° C. It is determined whether or not the temperature is equal to or lower (S302). If the temperature is equal to or lower than the predetermined temperature, the heat source 11 is combusted and the heating combustion control is executed (S303). When the temperature reaches a predetermined temperature, for example, 80 ° C. or higher, for example, combustion is stopped as the heat amount control of the heat source 11 (S305). By repeating such an operation, the temperature of the hot water 10 in the expansion tank 26 and the heating circuit 4 can be kept at a predetermined temperature, a temperature drop due to heat dissipation can be prevented, and the temperature rise during the transition to hot water supply, heating, or memorial service can be prevented. Temperature characteristics can be improved.

  Next, FIGS. 7 and 8 show specific examples of the heat source device of the present invention, FIG. 7 shows the configuration on the heat source unit side, and FIG. 8 shows the configuration on the control unit and heating load side.

  This heat source device is provided with a heat source device 2 constituted by a single casing, and a heating circuit 4, a hot water supply circuit 6 and a bath circuit 8 are constituted as in the above-described embodiment.

  For example, a burner 12 is installed in the heat source unit 2 as a single heat source. The burner 12 is supplied with a fuel gas G through a fuel supply pipe 18 provided with a fuel main valve 14 and a proportional valve 16, and is supplied with combustion air by an air supply fan 20. Combustion and combustion stop of the fuel gas G are performed by opening and closing the fuel main valve 14, and the amount of combustion of the fuel gas G is adjusted by supply adjustment by adjusting the opening of the proportional valve 16. Since the increase / decrease of the circulation amount of the hot water 10 flowing through the heating circuit 4 occurs at the temperature detected by the temperature sensor 60, if the combustion amount of the burner 12 is adjusted so that the outlet side temperature of the heat exchanger 22 becomes 80 ° C., for example, The amount of heat supply can be optimized.

  The heating circuit 4 is provided with heating heat exchangers 22 and 24 as first heat exchange means using the burner 12 as a heat source, an expansion tank 26 as heat storage means, and a circulation pump 28 as pressure feed means. Is installed. The heat exchanger 22 is for recovering combustion gas sensible heat, and the heat exchanger 24 is for recovering latent heat. The circulation pump 28 uses, for example, a DC motor as its driving means, and can control the rotational speed stepwise or continuously according to the heating demand.

  The heating circuit 4 includes a main circuit 30 for flowing the hot water 10 to the heating load side, a hot water supply / heating circuit 32 for heating the hot water W for hot water supply, a supplementary heating circuit 34 for heating the bath water, and the like. That is, the hot water 10 in the expansion tank 26 flows through the main circuit 30 in the directions of arrows A and B through the circulation pump 28, and is heated to, for example, about 80 ° C. through the heat exchanger 24 and the heat exchanger 22. It flows from the header 38 through the circuit 36 to the high-temperature radiators 40 and 42 such as fan convectors, and flows in the direction of arrow C through the bypass pipe 44 to the low-temperature water circuit 46. The expansion tank 26 is means for supplying hot water 10 to the heating circuit 4, storing heat with the hot water 10, and releasing the pressure in the heating circuit 4 to the atmosphere. A branch pipe 48 is provided between the high temperature water circuit 36 and the low temperature water circuit 46, and the low temperature water LD obtained by joining the hot water 10 flowing through the bypass pipe 44 and the high temperature water HD is the low temperature water circuit 46. To a low-temperature heat radiator 49, 50, 52 such as a floor heating panel. The hot water DB that circulates and joins the high-temperature radiators 40 and 42 and the low-temperature radiators 49, 50, and 52 merges in the heating water return circuit 56 that is a part of the main circuit 30 via the header 54, and enters the expansion tank 26. Return. The main circuit 30 has a temperature sensor 58 for detecting the inlet side temperature of the heat exchanger 24, the temperature sensor 60 for detecting the outlet side temperature of the heat exchanger 22, the low temperature water circuit 46 has a temperature sensor 61, and the bypass pipe 44 has The low-temperature control valve 62 is provided as a flow control means, and the check pipe 64 is provided in the branch pipe 48 as a means for preventing hot water 10 (low-temperature water) on the expansion tank 26 side from being mixed into the high-temperature water HD side. A low temperature water return circuit 65 is provided between the low temperature water circuit 46 and the expansion tank 26 so that the low temperature water LD is returned to the expansion tank 26 in the direction of arrow D.

  The hot water supply and heating circuit 32 is a circuit that branches from the outlet side pipe of the heat exchanger 22 and flows the high-temperature water HD to the expansion tank 26 in the direction of arrow E through the hot water supply heat exchanger 66 that is the second heat exchange means. In addition, a distribution valve 68 serving as a means for distributing the high-temperature water HD, a circulation flow rate sensor 70 for detecting a circulation flow rate, and the like are provided. As the heat exchanger 66, for example, a plate heat exchanger that performs heat exchange by alternately arranging plates and passing two different liquids is used. Further, the reheating heat circuit 34 branches from the outlet side pipe of the heat exchanger 22 and passes through the reheating heat exchanger 72 as the third heat exchanging means, and supplies the high temperature water HD in the direction of arrow F to the heating water. The circuit is joined by the return circuit 56 and returned to the expansion tank 26, and includes an on-off valve 74 or the like that is a means for distributing the high-temperature water HD. The heat exchanger 72 is a heat exchanger in which a spiral primary side pipe is installed in a cylindrical container to which a secondary side pipe is connected, and hot water 10 as a heat medium is caused to flow through the spiral pipe. Exchanges heat with the bath water flowing around. That is, the distribution valve 68 and the on-off valve 74 constitute switching means for switching the heat supply to the heating circuit 4, the hot water supply circuit 6, or the bath circuit 8.

  The hot water supply circuit 6 is a circuit independent of the heating circuit 4 and is heated by flowing heat water W in the directions of arrows G, H, and I to the heat exchanger 66 and exchanging heat with the high-temperature water HD as a heat medium. Then, hot water is supplied as hot water HW through the hot water supply pipe 78 from the hot water tap 76 or the like. The hot water supply circuit 6 includes a temperature sensor 80 for detecting the temperature of the supplied water, a water amount sensor 82 for detecting the water flow and the amount of water, a temperature sensor 84 for detecting the outlet side temperature of the heat exchanger 66, and a water amount control valve for controlling the amount of discharged hot water. 86, a temperature sensor 88 for detecting the tapping temperature is provided, and a bypass pipe 90 is provided as means for adjusting the tapping temperature by mixing the low temperature side clean water W and the high temperature water HW. Is provided with a mixing valve 92 for adjusting the mixing ratio of the low temperature side clean water W and the high temperature water HW.

  The bath circuit 8 constitutes a circuit independent of the heating circuit 4, and the bath water 96 stored in the bathtub 94 is caused to flow from the circulation port 98 of the bathtub 94 in the direction of arrow J, and is used as a heat medium by the heat exchanger 72. Is a means for flowing back in the direction of the arrow K and returning it to the bathtub 94 after it is heated by heat exchange with the hot water HD of the circulation pump 100 for forcibly circulating the bathtub water 96 through the heat exchanger 72, and a memorial temperature. A temperature sensor 102 for detecting, a water level sensor 104 for detecting the water level in the bathtub 94, and the like are provided. BR is the remembrance and BG is the warm water for remembrance return. A hot water supply pipe 108 is connected between the bath circuit 8 and the hot water supply circuit 6 via a switching valve 106, and hot water is supplied from the hot water supply circuit 6 to the bathtub 94. The hot water supply pipe 108 is provided with a water amount sensor 110 for detecting the amount of hot water supply, and an edge cutting device 112 as separation means for separating the water W side and the bathtub water 96.

A replenishment pipe 114 for replenishing hot water 10 from the hot water supply pipe 108 side is provided between the hot water supply pipe 108 and the expansion tank 26, and an open / close valve 116 is provided in the replenishment pipe 114. The expansion tank 26 is provided with level sensors 118, 120, 122 for detecting the water level of the hot water 10. The level sensor 118 is a neutral electrode, and the level sensor 120 has a low level L ₁ and the level sensor 122 has a high level L _2. Detected.

  A main control unit 124 and an external control unit 126 are provided on the heat source device 2 side, and the main control unit 124 and the external control unit 126 are configured by a computer, and a CPU, a control program, and a control as a means for performing a control operation. RAM, ROM, EEPROM, etc. are provided as storage means for storing information. On the main control unit 124 side, in addition to the additional heat amount change switch 128, a display unit 130 made of liquid crystal, fluorescent display tube, LED, cathode ray tube, operation A switch group 131 for inputting commands, temperature setting information, and the like is provided. Detection signals from the temperature sensors 58, 60, 61, 80, 84, 88, 102, level sensors 118, 120, 122, water volume sensors 82, 110, water level sensor 104, etc. are taken into the main controller 124 as control information. From the main control unit 124, the fuel main valve 14, the proportional valve 16, the circulation pumps 28 and 100, the distribution valve 68, the on-off valves 74 and 116, the low temperature adjusting valve 62, the water amount control valve 86, the mixing valve 92, the switching valve 106, A control output is applied to the drive motor of the air supply fan 20 and the like. In addition, a remote controller 132 for hot water supply is connected to the main controller 124, and a remote controller 134 installed on the bathtub 94 side is connected. The remote control device 132 is provided with a heating switch in the switch group 131 or as another switch, and whether or not to shift to the heating operation is switched by operating the heating switch. The operation of the heating switch does not select a specific radiator 40 to 52, but burns the burner 12 as a preparation for entering the heating operation of the entire heating load, and serves as a heat medium by heat exchange by the heat exchangers 22 and 24. The warm water 10 is heated, while the individual load heating operation is commanded or switched by the heating switch of the remote control device 134 or the remote control devices 142, 144, and 146 described later. Even if the heating switch on the side is not operated, each remote control device 134 or the like can select individual heating loads and shift to the heating operation. The difference between the operation of the heating switch on the remote control device 132 side and the operation of the heating switch such as the remote control device 134 is that the former corresponds to the overall heating load and the latter corresponds to the individual heating load.

  The main control unit 124 and the external control unit 126 are connected via a communication cable 136, and the external control unit 126 is connected to the high-temperature heating control units 138 and 140 installed in the radiators 40 and 42, and the radiator 49 is wirelessly or wired. Are connected to each other, and the control units 138 and 140 are provided with remote control devices 144 and 146, respectively. In this embodiment, the remote control device 134 installed on the bathroom side is used for the operation of the radiators 50 and 52, and its operation or operation stop is switched by the remote control device 134.

  Next, the control operation will be described generally. The hot water 10 in the expansion tank 26 is pumped to the heat exchanger 22 and the heat exchanger 24 by the circulation pump 28, and the sensible heat and latent heat of the combustion gas obtained by the burner 12 combustion. It is heated with. At the start of combustion of the burner 12, the detected temperature Ti of the temperature sensor 58, the set temperature Ts, and the flow rate Q corresponding to the rotational speed R of the circulation pump 28 are read from the storage means of the main control unit 124, and the combustion number is calculated. The proportional valve 16 is adjusted to an opening degree corresponding to the calculation number, and adjusted to the combustion amount. That is, feedforward control is executed. Here, as is well known, the combustion number is obtained by equation (1).

      Number = (Ts−Ti) × Q / 25 (1)

  The outlet side temperature of the heat exchanger 22 is detected by the temperature sensor 60. When the detected temperature reaches, for example, around 80 ° C., the proportional valve 16 is set so that the detected temperature of the temperature sensor 60 becomes a predetermined temperature, for example, 80 ° C. The opening is adjusted. That is, the feedforward control is switched to the feedback control.

  The high-temperature water HD obtained by the heat exchanger 22 is supplied to the radiators 40 and 42 through the high-temperature water circuit 36 and also flows to the low-temperature water circuit 46 side through the branch pipe 48. Since the hot water 10 before heating flows into the low temperature water circuit 46 side from the bypass pipe 44 side, the low temperature water LD is supplied to the radiators 49, 50 and 52 side. In this case, the temperature sensor 61 detects the temperature on the low temperature water LD side, and the opening degree of the low temperature adjustment valve 62 as the water amount control valve is adjusted so that the detected temperature becomes, for example, 60 ° C. Then, the hot water 10 that has passed through the radiators 40 to 52 returns to the expansion tank 26 through the heating water return circuit 56.

  Further, the clean water W flowing through the hot water supply circuit 6 to the secondary side of the heat exchanger 66 is heated by heat exchange with the high-temperature water HD in the heat exchanger 66 and hot water is supplied through the hot water supply pipe 78. In this case, the temperature of the water supply is detected by the temperature sensor 80, the amount of water supply, that is, the amount of hot water supply is detected by the water amount sensor 82, the temperature of the hot water is detected by the temperature sensor 88, and the burner 12 burns according to the temperature of the hot water. The amount is controlled.

  The bathtub water 96 flowing to the heat exchanger 72 by the circulation pump 100 is circulated and heated to the bath circuit 8 while heat exchange with the hot water 10 as the heat medium is performed. In this case, the water level of the bathtub water 96 is detected by the water level sensor 104, and the temperature thereof is detected by the temperature sensor 102.

The water level in the expansion tank 26 is detected by the level sensor 118 to 122, clean water W from the hot water supply circuit 6 by opening the on-off valve 116 is supplied when the low level L ₁ is detected, to a high level L ₂ To be replenished.

  Next, each operation of the high temperature heating operation, the low temperature heating operation, the hot water supply operation, the memorial operation and the heat insulation operation will be described.

(1) High temperature heating operation For example, when the operation switch of the remote control device 144 of the high temperature heating control unit 138 is turned on, the high temperature heating operation mode is entered. That is, an on-off valve that allows the high-temperature water HD that is a heat medium to pass through the radiator 40 is opened, and a fan (not shown) starts rotating. At this time, when a heating operation command is issued from the high-temperature heating control unit 138 to the external control unit 126 and a command code representing the heating operation command is transferred from the external control unit 126 to the main control unit 124, the main control unit 124 Start heating operation.

  The circulation pump 28 and the air supply fan 20 are operated, the fuel main valve 14 and the proportional valve 16 are opened to start the combustion of the burner 12, and the detected temperature of the temperature sensor 60 is, for example, 80 ° C. Adjust the opening. The high temperature water HD circulates in the radiator 40 and then returns to the expansion tank 26 as a low temperature hot water DB. When the room temperature reaches the set temperature, the main control unit 124 closes the on-off valve in the radiator 40 to stop the circulation of the high-temperature water HD. When the room temperature drops to the predetermined temperature, the main control unit 124 again opens the on-off valve. Open and start circulation of the high-temperature water HD again to perform heating at a predetermined temperature.

(2) Low-temperature heating operation In this embodiment, radiators 49, 50, and 52 required for low-temperature heating are installed, but the operation mode is switched to the low-temperature heating operation mode by the operation switch on the remote control device 134, 142 side. That is, the supply of the low temperature water LD is started independently of the radiator 49 and the radiators 50 and 52. In this case, the supply switching of the low temperature water LD to the radiator 49 is operated by the heating switch on the remote control device 142 side. The supply switching of the low-temperature water LD to the radiators 50 and 52 is operated by switching the heating switch on the remote control device 134 side.

  In this low temperature heating operation, when there is a heating command from the remote control devices 134, 142, the external control unit 126 or the main control unit 124 selectively opens the on-off valves 148, 150 on the header 47 side, and the main control unit 124 circulates. The operation of the pump 28 and the air supply fan 20 is started, and the combustion operation of the burner 12 and its control are performed. In this case, unlike the high-temperature heating operation, the low-temperature adjustment valve 62 in the bypass pipe 44 is opened, and the opening degree of the proportional valve 16 is adjusted so that the temperature detected by the temperature sensor 60 becomes 80 ° C., for example. Then, the temperature of the low temperature water LD is detected by the temperature sensor 61, and the opening degree of the low temperature adjustment valve 62 is adjusted so that the detected temperature becomes, for example, 60 ° C. The hot water DB that has circulated through the radiators 49, 50, 52 returns from the heating water return circuit 56 to the expansion tank 26.

(3) Hot-water supply operation This is an operation for filling the bathtub 94 with hot water after the operation switch of the remote-control device 132 or the remote-control device 134 is operated and then the currant or shower is opened. When the hot water tap 76 is opened, a water flow is generated, and this water flow is detected by the water amount sensor 82. At this time, the circulation pump 28, the air supply fan 20, etc. are operated to start the combustion of the burner 12, and the set temperature stored in the remote control device 132 or the remote control device 134, the detected temperature of the temperature sensor 88, and the water amount sensor 82 The required hot water number is calculated from the equation (1) based on the detected water amount. In order to give the amount of heat corresponding to the number of computations from the warm water KW to the clean water W, it is necessary to ensure the flow rate of the warm water KW that the heat exchanger 66 requires. Therefore, the flow rate is secured by setting the distribution valve 68 to an opening corresponding to the arithmetic number, and the hot water supply temperature is controlled to be the set temperature without being affected by temperature fluctuation due to the combined use of the heating operation and the memorial operation. .

  In this case, the temperature of the hot water from the heat exchanger 66 is detected by the temperature sensor 88, and the opening of the mixing valve 92 is adjusted so that the detected temperature of the temperature sensor 88 matches the set temperature. In addition, when the amount of tapping water becomes excessive, the opening of the water amount control valve 86 is throttled to control the amount of tapping water appropriately.

(4) Mourning operation When a memorial command is issued from the remote control device 134, a transition to the memorial operation mode is made. The on-off valve 74 is opened, the circulation pump 28, the air supply fan 20, etc. are operated, and the burner 12 is combusted. The opening degree of the proportional valve 16 is adjusted so that the temperature detected by the temperature sensor 60 is 80 ° C., for example. When the hot water OW flows to the heat exchanger 72 through the additional heat circuit 34 and the operation of the circulation pump 100 is started, the bathtub water 96 is circulated to the heat exchanger 72, so that the bathtub water 96 is heated by the hot water OW. Circulates in the bathtub 94. The temperature of the bath water 96 is detected by the temperature sensor 102. When the detected temperature coincides with the set temperature, the circulation pump 100 is stopped, the on-off valve 74 is closed, and the chasing operation is finished.

(5) Thermal insulation operation When there is no hot water demand for hot water supply operation, memorial operation, or heating operation, the mode is shifted to the thermal insulation operation mode. That is, when there is a demand for hot water, since it is necessary to increase the efficiency of raising the heating temperature, a warming operation is performed to raise the hot water 10 in the expansion tank 26 and the heating circuit 4 to a predetermined temperature, for example, 80 ° C. for a predetermined time. When a hot water supply demand occurs, the amount of hot water stored in the heating circuit 4 and the expansion tank 26 can be used for the hot water supply operation, the reheating operation, and the heating operation until the burner 12 starts combustion.

  In this case, even if each operation of hot water supply, renewal, and heating ends, the operation of the circulation pump 28 is continuously maintained, and the hot water 10 raised to a predetermined temperature, for example, 80 ° C. by the heat exchangers 24 and 22 is It circulates to the expansion tank 26 through the pipe line of the hot water supply / heat circuit 32, and the hot water 10 in the expansion tank 26 is raised to the temperature of the high temperature water HD, for example, 80 ° C. This temperature is detected by the temperature sensor 60. When the detected temperature exceeds 80 ° C., for example, the fuel main valve 14 is closed to stop the combustion of the burner 12, and when the detected temperature decreases to 78 ° C., for example. The fuel source valve 14 is opened and combustion of the burner 12 is started, and the hot water temperature in the pipe line of the heating circuit 4 is maintained at, for example, about 80 ° C. In this heat retaining operation, after a predetermined time has elapsed from the start, combustion of the burner 12 is stopped and the circulation pump 28 is stopped.

  Next, the basic control operation will be described with reference to the flowchart shown in FIG. 9. Steps S1 to S5 are routines in which hot water circulation heating is performed by hot water supply, reheating, and heating commands, and steps S6 to S11 are hot water supply, additional heat treatment, and so on. This is a routine from the end of the heating operation to the heat retention operation until the hot water circulation heating stops.

  In step S1, it is determined whether or not a control command such as hot water supply, hot water filling, chasing, heating, or the like has been received from the remote control devices 132, 134, 142, 144, and 146. In step S2, it is determined whether or not the operation start time reserved by remote control devices 134, 142, 144, and 146 has arrived. In step S3, the circulation pump 28 is operated, combustion of the burner 12 is started, and hot water circulation is performed.

  In step S4, the hot water heated by the heat exchangers 22 and 24 is supplied to any one or more of the heat exchanger 66, the heat exchanger 72, the radiators 40, 42, 49, 50, and 52. . The hot water KW flowing through the heat exchanger 66 heats the clean water W to discharge hot water HW. Moreover, the hot water OW which flows into the heat exchanger 72 heats the bathtub water BR, flows into the bathtub 94 as heated bathtub water BG, and the bathtub water 96 of the bathtub 94 is stirred and heated. The high temperature water HD flows to the radiators 40 and 42, and the low temperature water LD flows to the radiators 49, 50, and 52, and heating is performed by the heat radiation. In step S5, it is determined whether or not all operations such as hot water supply, chasing, and heating have been stopped according to commands from each remote control device or the like.

  In step S6, timer measurement of the warming standby time t is started, and in step S7, the operation of the circulation pump 28 and the combustion of the burner 12 are continued, and the hot water flowing through the expansion tank 26 and the heating circuit 4 is heated to a predetermined temperature, for example, 80 Control to heat to ℃. In step S8, it is determined whether or not any command such as hot water supply, chasing or heating is issued from each remote control device or the like. When the command is issued, the process proceeds to step S9, the measurement of the warming standby time t is finished, and the process proceeds to step S4. In step S4, the hot water that has been circulated and kept warm is supplied to hot water supply, reheating, or heating until the temperature rises to, for example, 80 ° C. as a predetermined hot water temperature by combustion of the burner 12.

  In step S10, it is determined whether or not the warming standby time t has elapsed. When the warming standby time t has elapsed, in step S11, the fuel source valve 14 and the proportional valve 16 are closed, and the circulation pump 28 is stopped. Stop hot water heating circulation.

  Next, the rotational speed control of the circulation pump 28 associated with control operations such as a hot water supply operation, a heating operation, and a memorial operation will be described with reference to flowcharts shown in FIGS. a to f indicate connectors between the flowcharts.

  In this heat source device, the number of revolutions of the pump is changed in accordance with the demand for hot water, the amount of combustion of the burner 12 accompanying the change in the number of revolutions is increased and decreased, and hot water appropriate for each heat exchanger 22, 24, 66, 72, etc. In order to supply the amount of heat, especially in hot water supply operation, it is necessary to reduce the error from the set temperature, so the flow rate of hot water required to heat the tap water W is secured, and the remaining amount of hot water is distributed to memorial, heating, etc. Yes. That is, even if a shortage of heat occurs due to heating operation or renewal operation, the hot water heat amount necessary for hot water heating is secured on the hot water supply side.

  Steps S <b> 21 to S <b> 25 and S <b> 47 to S <b> 49 are routines in which the opening degree of the distribution valve 68 is changed according to the number of hot water supply requests and the amount of hot water 10 necessary for heating the clean water W is supplied to the heat exchanger 66. . If the hot water supply number is less than 12, steps S21 to S25 are executed, and if it is 12 or more, steps S47 to S49 are executed.

  Steps S26, S29, S30, Steps S50, S53, and S54 are control routines for the pump rotation speed when the chasing operation or hot water supply and chasing are simultaneously performed.

  In addition, the routine following steps S26 to S28, the routine following steps S26, S29, S31, and S28, or the routine following steps S50 to S52, and the routine following steps S50, S53, S55, and S52 are performed by the heating switch of the remote control device 134. It is a routine which shows the rotation speed of the pump at the time of heating performed by charging.

  Steps S32 to S41 are based on the number of operating low-temperature heating terminals or high-temperature heating terminals determined from the number of commands from a remote controller or the like when heating operation or hot water supply and heating less than 12 is operated. This is a routine for changing the number, and steps S42 to S46 are routines for changing the number of rotations of the pump in accordance with the number of operating heating terminals when hot water supply, chasing, or heating operation is performed.

  Steps S56 to S60 are routines for changing the pump rotation speed based on the number of operating low-temperature heating terminals or high-temperature heating terminals when hot water supply and heating of No. 12 or more are being operated, and step S61. -S63 is a routine for changing the pump rotation speed according to the number of operating heating terminals when hot water supply, chasing, or heating operation of No. 12 or more is performed.

  Next, this control operation will be described in order. In step S21, it is determined whether there is a hot water supply operation request. The presence or absence of this hot water supply operation request is determined by the flow rate detected by the water amount sensor 82. When there is a hot water supply operation request, the process proceeds to step S22, and a required hot water supply request number, that is, a gas combustion amount is calculated from the set temperature, the incoming water temperature, and the incoming water amount. The number of hot water supply requests can be calculated from equation (1). The opening degree of the distribution valve 68 is determined by the number of hot water supply requests, and the opening degree of the distribution valve 68 is in a predetermined step, for example, two steps depending on the number, and the minimum predetermined flow rate at which the number 12 is obtained is less than 12 The valve opening No. 12 or more is the valve opening that gives the maximum predetermined flow rate obtained up to No. 24, both of which were obtained from experimental values. Moreover, you may control each request | requirement number continuously from the calculated value of a hot-water supply request | requirement number not stepwise. At that time, with respect to the calculated value of the number of hot water supply requests, the opening of the distribution valve 68 is continuously set so that the circulation amount of the circulation flow sensor 70 is the minimum circulation flow rate that can ensure the required hot water supply capacity obtained in advance through experiments. adjust. By adjusting the distribution valve 68 continuously, the surplus capacity can be distributed to bath hot water and heating. Therefore, the continuous opening adjustment enables more reasonable hot water supply and heating operation than the stepwise opening adjustment. .

  If it is determined in step S22 that the hot water supply capacity is, for example, No. 12 or higher, the flow proceeds to step S47 in the flowchart shown in FIG. If it is determined that the hot water supply capacity is less than No. 12 in Step S22, the process proceeds to Step S23, and the distribution valve 68 is adjusted to a valve opening B that is a circulation flow rate required to obtain No. 12 hot water supply. To do.

  Here, the relationship between the valve opening degree, the hot water supply capacity, and the circulation flow rate is as shown in Table 1.

  In Table 1, each valve opening degree A to C corresponds to a circulation flow rate (heat flow rate) that can secure the number of upper symbols even when the hot water supply water temperature rises to 30 ° C.

  In step S24, it is determined from the outputs of the external control unit 126 and the remote control devices 134, 142, 144, and 146 whether or not there is a request for a chasing operation or a heating operation. If there is no such request, the process proceeds to step S25, and the pump speed is fixed to a predetermined speed, for example, 3300 rpm. In this case, the hot water is discharged with a hot water supply of less than No. 12, or the state of the pre-pump and the post-pump is considered, and the pump rotational speed is a fixed value.

  If there is a request for the chasing operation or the heating operation, the process proceeds to step S26, and it is determined from the output of the remote control device 134 whether the chasing operation is requested. When there is no memorial operation request | requirement, it transfers to step S27 and it is judged whether a heating request | requirement is an individual heating load. Here, the individual heating load is one or more of the specific radiators 40, 42, 49, 50, and 52, and the case where these heating loads are not specified is determined as other than individual, that is, the entire heating load. To do. In this embodiment, the radiators 50 and 52 are not independent loads but are single loads as viewed from the control side. In the case of an individual heating load, since the required amount of heat becomes small when viewed from the overall heating load, the hot water supply is less than No. 12, and the hot water operation and the heating operation or the heating operation alone are set. At this time, if the heating request is not an individual heating load, the required number of heating cannot be determined, so the process proceeds to step S28, and the pump rotation speed is fixed to an upper limit value, for example, 4100 rpm, assuming the maximum required heat amount.

  In the case of an individual operation request in step S27, the process proceeds to step S32 in the flowchart shown in FIG. The rotation speed selection in this case is as shown in the flowchart of FIG.

  If there is a memorial operation request in step S26, the process proceeds to step S29. In step S29, the presence or absence of a heating operation request is determined from the external control unit 126, each remote control device 134, 142, 144, 146, or the like. If there is no heating operation request, the process proceeds to step S30, and the pump speed is fixed at a predetermined speed, for example, 3500 rpm. In this case, it is a hot water supply less than No. 12, and is a state of a hot water operation and a memorial operation, or a memorial operation alone. In the case of memorial operation, the pump rotation speed is not changed and is set to a fixed value. The memorial operation (heat exchange on the bath side) is fixed rotation without the need to increase or decrease the pump rotation speed from the start to the end of boiling. The fixed rotational speed is obtained by experimentally determining the pump rotational speed corresponding to a predetermined amount of heat necessary for boiling.

  If there is a heating operation request in step S29, it is determined in step S31 whether the heating request is an individual heating load. If not, the required number of heating cannot be determined as described above. Therefore, the process proceeds to step S28, and the pump rotational speed is fixed at, for example, 4100 rpm as an upper limit value.

  And in the case of an individual operation request | requirement by step S27, it transfers to step S32 shown in FIG. 11, it is judged whether a heating request | requirement has other than 1 system | strain, and in the case of 1 system | strain, it transfers to step S34, The pump speed is set to a lower limit value, for example, 3300 rpm, and if the heating request is other than one system, the process proceeds to step S35, and it is determined whether the heating request is other than two systems. In this case, the process proceeds to step S36, and the pump speed is set to a lower limit value, for example, 3300 rpm. If the heating request is other than two systems, the process proceeds to step S37, and whether there is a heating request other than three systems. If there are three systems, the process proceeds to step S38, the pump speed is set to a predetermined value, for example, 3500 rpm, and if the heating request is other than three systems, the process proceeds to step S39. Then, it is determined whether there are any heating requests other than four systems. If there are four systems, the process proceeds to step S40, the pump speed is set to a predetermined value, for example, 3800 rpm, and the heating request is four systems. Otherwise, the process proceeds to step S41, and the pump speed is set to an upper limit value, for example, 4100 rpm.

  Moreover, in the case of an individual operation request | requirement by step S31, it transfers to step S42 shown in FIG. 12, it is judged whether a heating request | requirement has other than 1 system | strain, and in the case of 1 system | strain, it transfers to step S43, The pump speed is set to a predetermined value, for example, 3600 rpm, and if the heating request is other than one system, the process proceeds to step S44, and it is determined whether the heating request is other than two systems. In the case, the process proceeds to step S45, the pump speed is set to a predetermined value, for example, 3800 rpm, and if the heating request is other than two systems, the process proceeds to step S46, and the pump speed is set to an upper limit value, for example, Set to 4100 rpm.

  If it is determined in step S22 of FIG. 10 that the hot water supply capacity is No. 12 or higher, the distribution valve 68 is adjusted to a valve opening C which is a circulation flow rate necessary for obtaining hot water of No. 24 in step S47 of FIG. Then, the process proceeds to step S48. In step S48, it is determined from the outputs of the external control unit 126 and the remote control devices 134, 142, 144, and 146 whether or not there is a request for a chasing operation or a heating operation. If there is no such request, the process proceeds to step S49, and the pump rotational speed is fixed to a predetermined rotational speed, for example, 3500 rpm. In this case, since the hot water is discharged from No. 12 or more, the pump rotational speed is a fixed value.

  If there is a request for the chasing operation or the heating operation, the process proceeds to step S50, and it is determined from the output of the remote control device 134 whether the chasing operation is requested. If there is no memorial operation request, the process proceeds to step S51, where it is determined whether the heating request is an individual operation request, and if not, the process proceeds to step S52. In step S52, hot water supply of No. 12 or more is used, and the hot water supply operation and the heating operation are performed. When the operation is not an individual request operation, the required number of heating cannot be determined, so the pump rotation speed is fixed to an upper limit value, for example, 4100 rpm.

  In the case of an individual operation request in step S51, the process proceeds to step S56 in the flowchart shown in FIG. The rotation speed selection in this case is as shown in the flowchart of FIG.

  In step S50, it is determined from the output of the remote control device 134 whether there is a follow-up operation request. If there is a follow-up operation request, the process proceeds to step S53, where it is determined whether there is a heating operation request. 126 and the output of each remote control device 142, 144, 146. When there is no heating operation request, the process proceeds to step S54. In step S54, hot water supply of No. 12 or more is set, and a hot water supply operation and a memorial operation state are set. In this case, a fixed value is obtained without changing the rotation speed. In the memorial operation (bath-side heat exchange), it is not necessary to increase / decrease the pump speed between the start and end of boiling, so the speed is fixed. At this time, the fixed rotational speed is obtained from an experimental value for the rotational speed necessary to obtain a predetermined amount of heat.

  If there is a heating operation request in step S53, the process proceeds to step S55, and in step S55, it is determined whether the heating operation request is an individual operation request. In this case, the hot water supply of No. 12 or more is in the state of a hot water operation, a heating operation, and a memorial operation. At that time, if the heating request is not an individual operation request, the required number of heating cannot be determined, so the process proceeds to step S52, and the pump speed is fixed to an upper limit value, for example, 4100 rpm.

  Then, in the case of individual request operation in step S51, the process proceeds to step S56 shown in FIG. 14, and it is determined whether there is a heating request other than one system, and in the case of one system, the process proceeds to step S57, The pump speed is set to a predetermined value, for example, 3500 rpm, and if the heating request is other than one system, the process proceeds to step S58 to determine whether the heating request is other than two systems. In this case, the process proceeds to step S59, the pump speed is set to a predetermined value, for example, 3800 rpm, and if the heating request is other than two systems, the process proceeds to step S60, and the pump speed is set to an upper limit value, for example, Set to 4100 rpm.

  And in the case of an individual operation request | requirement by step S55, it transfers to step S61 shown in FIG. 15, judges whether a heating request | requirement has other than 1 system | strain, and in the case of 1 system | strain, it transfers to step S62, The pump rotational speed is set to a predetermined value, for example, 4000 rpm. If the heating request is other than one system, the process proceeds to step S63, and the pump rotational speed is set to an upper limit value, for example, 4100 rpm. In this case, the hot water supply of No. 12 or more is in the state of a hot water operation, a heating operation and a memorial operation.

  In addition, each flowchart shown in FIG.11, FIG.12, FIG.14, FIG.15 judges the number of heating request | requirements (number of request | requirement systems) from a remote control apparatus etc., and selects the rotation speed according to each number. The number of heating requests is determined to be one system for both low and high temperatures. The number of rotations corresponding to each is obtained from experimental values, but this is the number of rotations that can satisfy the external lift required for one system, and the specific value can satisfy the standards of gas supply companies, etc. Is.

  Next, the hot water supply control operation will be described with reference to the flowcharts shown in FIGS. “g” and “h” indicate connectors in each flowchart.

  Steps S71 to S76 are a failure detection routine for the mixing valve 92 before the start of hot water supply. Steps S71 and S78 to S81 calculate the required number when the flowing water of the clean water W is detected. This is a routine for changing the opening. The amount of heat that satisfies the required number is supplied to the heat exchanger 66 to stabilize the temperature of the hot water supply HW. Step S82 is a routine for determining whether hot water is being circulated.

  Steps S82 to S83 and S86 to S90 are hot water supply operations in which hot water 10 at a predetermined temperature, for example, 80 ° C. is circulating. If the hot water is circulating, the clean water W staying in the vicinity of the heat exchanger 66 is heated and kept warm. By mixing the retained water and the clean water W, quick hot water can be discharged, and the warm water WW can be immediately heated by the circulating warm water KW. In this routine, the mixing valve 92 and the water amount control valve 86 are controlled for immediate hot water to adjust the clean water W to a set temperature.

  Steps S <b> 73 to S <b> 76 show a processing routine at the time of failure of the mixing valve 92. The adjustment of the hot water supply temperature depends on the adjustment of the opening degree of the mixing valve 92. Since there is a possibility that hot water supply is performed due to a failure of the mixing valve 92, it is determined whether or not the mixing valve 92 is normal during hot water preparation or when hot water supply is stopped, and hot water supply is prohibited when an abnormality is detected.

  Step S85 shows a hot water supply processing routine at the time of cold start of hot water supply when hot water is not circulating. That is, since the temperature of the hot water is raised and the heat exchanger 66 is heated by the amount of heat of the hot water, a time lag occurs until the hot water supply of the hot water supply HW at the set temperature. Therefore, the mixing valve 92 is temporarily closed in order to control the pump rotation speed in order to increase the temperature of the hot water KW and to increase the temperature of the hot water supply HW in the heat exchanger 66.

  Each operation will be described along the steps. In this hot water supply operation control, the water amount control valve 86 shifts the amount of discharged hot water to the maximum regulation value, and the mixing valve 92 shifts the temperature of discharged hot water to the set temperature. Further, the water amount control valve 86 regulates the amount of hot water so that it always becomes the maximum restriction value, and the mixing valve 92 performs the mixing operation until the temperature of the hot water falls within the set temperature range.

  In step S71, it is determined whether or not the water amount sensor 82 has detected flowing water. If there is no flowing water, the flow proceeds to step S72 to open the water amount control valve 86, and the flow proceeds to step S73 to move the mixing valve 92. After opening the opening to the fully open position, the process proceeds to step S74, where it is determined whether or not the fully open limit is detected. If the fully open limit is not detected, the process proceeds to step S75, and only for a predetermined time, for example, 10 seconds. If the full-open limit is not detected within that time, the process proceeds to step S76, and an abnormality alarm is generated assuming that the mixing valve 92 is abnormal.

  If the fully open limit is detected within the predetermined time, the process proceeds to step S77 and returns to step S71. That is, when the combustion is stopped, the mixing valve 92 is fully opened to stand by, and the operation is terminated by detecting a limit within a predetermined time after starting the valve operation.

  In step S78, the hot water supply request number is calculated from the water supply temperature, flow rate, set temperature, etc., and the process proceeds to step S79 to determine the hot water supply request number. That is, in step S79, it is determined whether or not the hot water supply request number is less than a predetermined number, for example, less than 12, and if it is less than the predetermined number, the process proceeds to step S80 and the distribution valve 68 is set to a predetermined valve opening. When the valve opening degree B is set and the number is not less than the hot water supply number, the process proceeds to step S81 and the distribution valve 68 is set to the valve opening degree C as a predetermined valve opening degree. In this case, the valve opening degree corresponding to each hot water supply capacity is selected, and the opening degree of the distribution valve 68 may be continuously moved with respect to the number of hot water supply requests. The valve opening is such that a minimum circulating flow rate that satisfies the required number of values obtained can be secured.

  In step S82, it is determined whether heating / warm water circulation control (other operations, etc.) is started. If heating / warm water circulation control is started, the process proceeds to step S83 to operate the mixing valve 92. . If the heating / warm water circulation control has not been started, the process proceeds to step S84 to start the heating / warm water circulation control. After that, the process proceeds to step S85 to perform the cold start control, and the process proceeds to step S83. To do.

  In step S83, the mixing valve 92 is operated to match the hot water supply temperature. At this time, the mixing valve 92 is adjusted to the valve opening previously obtained by experiment from the detection output of the temperature sensor 88 and the temperature sensor 80, the amount of incoming water and the set temperature. In this case, in step S83, the mixing valve 92 is operated so that the basic data obtained by experiments or the like in advance based on the required number obtained in step S78 is read from the ROM, which is the storage means, and reaches a predetermined temperature. Control, i.e., feedforward control.

  In step S86, it is determined whether or not the water amount control is greater than or equal to the maximum flow rate. If the flow rate is greater than or equal to the maximum flow rate, the flow proceeds to step S87 to restrict the water amount to the maximum value. That is, in steps S86 and S87, when the hot water supply amount exceeds the maximum flow rate at which hot water can be supplied by the water amount control valve 86, the valve opening degree is regulated to the maximum flow rate. However, if the amount of hot water supply is less than the maximum flow rate, the valve opening is maintained. In this case, the maximum flow rate is

Maximum flow rate =
{(Hot water temperature-Feed water temperature) / (Set temperature-Feed water temperature)} x Detection flow rate
... (2)
Given in.

  In step S88, it is determined whether or not the hot water temperature has reached the temperature range of the set temperature ± α. If not, the process proceeds to step S89 so that the hot water temperature becomes the set temperature. Then, the opening degree of the mixing valve 92 is finely adjusted so that the hot water temperature reaches the set temperature ± α. In this case, when the set temperature is not reached only by the operation of step S88, the control for operating the mixing valve 92 so that the temperature detected by the temperature sensor 88 falls within the set temperature range, that is, feedback control is performed.

  When it is determined in step S88 that the tapping temperature has reached the set temperature range, the process proceeds to step S90, the opening degree of the water amount control valve 86 and the mixing valve 92 is maintained, and the process returns to step S71.

  Next, as shown in FIG. 18, in the heating / warm water circulation control in step S84, the temperature on the inlet side of the heat exchanger 24 is detected by the temperature sensor 58 in step S91, and then the process proceeds to step S92 to calculate the pump rotation speed. After that, the pump operation is started. In this case, the flow rate is calculated from the pump rotational speed obtained in advance in the basic experiment, and the outlet temperature of the heat exchanger 22 is operated at a predetermined rotational speed, for example, 80 ° C., and the hot water temperature is, for example, 80 ° C. can be reached quickly.

  In step S93, combustion control is started. In step S94, the outlet temperature of the heat exchanger 22 is detected by the temperature sensor 60, and it is determined whether or not the detected temperature is equal to or higher than a predetermined temperature, and the hot water temperature has reached the predetermined temperature. In step S95, the operation is performed at the rotational speed calculated from the pump rotational speed control. In this case, when the hot water temperature after heat exchange reaches a predetermined temperature, the operation is performed at the pump speed determined by the normal pump speed determination control.

  Further, in the cold start control in step S85 of the flowchart shown in FIG. 17, as shown in FIG. 19, after the hot water side of the mixing valve 92 is fully opened in step S101, the process proceeds to step S102 and the hot water temperature is set to a predetermined temperature. It is determined whether or not. The hot water side of the mixing valve 92 is opened until the hot water temperature reaches a predetermined temperature, and when the hot water temperature reaches the predetermined temperature, the cold start control is terminated. In this case, at the time of cold start, the hot water side of the mixing valve 92 is fully opened up to a predetermined temperature, for example, 37 ° C. to improve the rise, and when the predetermined temperature is reached, the normal control is started.

  Next, another embodiment of the heat source device of the present invention will be described.

  FIG. 20 shows an embodiment of the danger prevention control of the heat source device of the present invention. In this heat source device, the danger prevention control is a control for preventing hot hot water having a temperature higher than the maximum set temperature when the mixing valve 92 fails. The heat exchange that heats the clean water W flowing through the hot water supply circuit 6 using the hot water 10 that is a heat medium is indirect heat exchange, so that low-flow hot water without the possibility of boiling the heat exchanger 66 is possible. When the mixing valve 92 is closed due to failure, the hot water is discharged at a low flow rate, and the hot water (cold water) W passing through the bypass pipe 90 is not mixed. There is a risk of hot hot water.

  In order to prevent this high temperature hot water, when it is detected that the mixing valve 92 is closed, the distribution valve 68 is closed to shut off heat transfer, that is, hot water is cut off, and hot water supply and heat exchange are stopped. Then, since there is no amount of heat to be supplied to the clean water W, it is possible to avoid an increase in the hot water supply temperature, but the hot water supply circuit 6 uses the bypass pipe 90. There is a risk of boiling. Therefore, if the on-off valve 74 on the side of the bath circuit 8 is opened and the additional heating circuit 34 is used as a bypass bypass as shown by the broken line, boiling of the heating circuit 4 can be avoided. In this case, unless the circulating pump 100 is operated, the bathtub water 96 on the bathtub 94 side does not become hot.

  As another control, when a closing failure of the mixing valve 92 is detected, the water amount control valve 86 is closed to forcibly stop the hot water. In this case, it is assumed that the closing function of the water amount control valve 86 is broken, and when the water amount control valve 86 is broken, the safety can be further improved by stopping the combustion of the burner 12.

  If this danger prevention control is demonstrated with reference to the flowchart shown in FIG. 21, it will be detected whether the mixing valve 92 has abnormality in step S401. In other words, the abnormality detection method for the mixing valve 92 is determined to be abnormal if any limit cannot be detected by the main control unit 124 after a predetermined time that normally reaches the closed or open limit (limit angle). To do. As another detection method, when it is determined that the hot water supply operation is stopped from the detection output of the water amount sensor 82, the operation request of the remote control device, or the like, the mixing valve 92 operates in the fully open direction. At that time, if the open limit cannot be detected from the mixing valve 92 after a predetermined time has elapsed, it is similarly determined that there is an abnormality.

  If it is determined in step S401 that there is an abnormality in the mixing valve 92, the operation of the heat source, in this embodiment, combustion is temporarily stopped in step S402. In step S403, the hot water discharge is prevented by closing the water amount control valve 86 and stopping the hot water supply hot water. As a result, the user is not exposed to high temperature hot water.

  In steps S404 and S405, a failure of the water amount control valve 86 is detected. That is, in step S404, it is determined whether or not a predetermined time, for example, 10 seconds has elapsed since the closing operation of the water amount control valve 86, and within 10 seconds, the process proceeds to step S405, and in step S405, the water amount control valve 86 fails. When the hot water cannot be closed due to the above, there is a risk of hot hot water hot water, so the closing limit of the water amount control valve 86 is detected to check whether or not the water amount control valve 86 is closed. If the closing is not confirmed within 10 seconds from the start of the closing operation, the process proceeds to step S406, it is determined that both the water amount control valve 86 and the mixing valve 92 have failed (double failure), and the combustion is completely stopped. Announces anomalies. By stopping combustion of the heat source, high temperature hot water can be reliably avoided.

  In step S407, the on-off valve 74 is opened to cause the additional heat circuit 34 to function as a bypass bypass. In step S408, the distribution valve 68 is opened at a predetermined opening, in this case, the heat exchanger 66 side. By setting the valve to the closed position (valve opening A), the flow rate is reduced to zero, the heat transfer to the heat exchanger 66 is interrupted, and in step S409, an alarm is turned on on the display unit 130 to notify the abnormality of the mixing valve 92. Moreover, in step S410, heating other than the hot water supply operation and the renewal operation can be resumed, and combustion is resumed.

  If such control is performed, the structure of the heat source device shown in FIG. 7 can be used to prevent high temperature hot water and safety can be improved. Note that steps S407 and 408 may be provided between step S402 and step S403 to perform the same processing.

  Next, FIG. 22 shows an embodiment of stabilization control of the low temperature going temperature of the heat source device of the present invention. In the high and low temperature heating device corresponding to the high temperature heating load and the low temperature heating load, the hot water temperature of the expansion tank 26 is dominant, so that the low temperature going temperature of the hot water LD with respect to the low temperature load is prevented from greatly deviating from the required temperature. Therefore, control is performed to improve the stability of the low temperature temperature.

  The high temperature water HD generated in the heat exchangers 22 and 24 and the high temperature water HD are mixed with the hot water 10 on the expansion tank 26 side to obtain the low temperature water LD. The high temperature water HD is the high temperature heating load, the low temperature water LD. Is supplied to a low-temperature heating load. Here, the low temperature going temperature is obtained by mixing the high temperature water HD and the hot water 10, but when the hot water 10 and the high temperature water HD are mixed, the pressure of the hot water 10 on the expansion tank 26 side from the high temperature water HD is increased. Since the pressure is high, the pressure imbalance affects the mixing ratio of the two, and the low temperature going-back temperature may vary depending on the hot water temperature on the hot water 10 side and may vary. For example, when the hot water temperature on the expansion tank 26 side is 50 ° C. and the temperature on the high temperature water HD side is 80 ° C., the hot water temperature in the expansion tank 26 is lowered by 10 ° C. even if a fixed orifice for pressure balancing is installed. Then, the low temperature going temperature becomes 50 ° C., and there is a possibility that the low temperature water LD cannot be set to, for example, 60 ° C. as a predetermined temperature.

  Therefore, in this embodiment, a low temperature adjusting valve 62 is installed instead of the fixed orifice. If such a low temperature adjusting valve 62 is installed, when the hot water temperature of the expansion tank 26 is low, the opening degree of the low temperature adjusting valve 62 is reduced to suppress the flow rate, and when the hot water temperature of the expansion tank 26 is high, the low temperature adjustment is performed. If the opening of the valve 62 is opened to increase the flow rate, the low temperature water LD can be controlled to a set temperature of 60 ° C.

  The stabilization control of the low temperature going temperature using the low temperature adjusting valve 62 will be described with reference to the flowchart shown in FIG. 23. In step S501, the low temperature going temperature is within a predetermined temperature range of the set temperature, for example, ± 1 ° C. Judge whether it is within or not. At this time, the low-temperature forward temperature is read from the temperature sensor 61, and the set temperature is set in each remote control device and the external control unit 126. When the low temperature going temperature is within a predetermined temperature range of the set temperature, for example, within ± 1 ° C., the process proceeds to step S502 to maintain the current valve opening, and when it is outside the predetermined temperature range of the set temperature, The process proceeds to step S503.

  In step S503, it is determined whether or not the low-temperature forward temperature is lower than the set temperature. If the low-temperature forward temperature is lower than the set temperature, the process proceeds to step S504. If the low-temperature forward temperature is higher than the set temperature, the process proceeds to step S505. To do. In step S504, the opening degree of the low temperature adjustment valve 62 is adjusted in the closing direction, and the temperature is brought close to the set temperature by increasing the amount of hot water on the higher temperature side. In step S506, it is determined again whether or not the low-temperature going-out temperature is within a predetermined temperature range of the set temperature, for example, within ± 1 ° C. If it is within that range, the process proceeds to step S508 and the current The valve opening is maintained, and the process returns to step S501. On the other hand, when the low temperature going-out temperature is outside the predetermined temperature range of the set temperature, for example, other than ± 1 ° C., the process proceeds to step S507, and it is determined whether or not the closed limit of the low temperature adjusting valve 62 is detected, and step S503 is performed. Return to.

  Moreover, in step S505, the opening degree of the low temperature adjustment valve 62 is adjusted in the opening direction, and the hot water amount on the higher temperature side is reduced to approach the set temperature. In step S509, it is determined again whether or not the low-temperature going-out temperature is within a predetermined temperature range of the set temperature, for example, within ± 1 ° C. If it is within that range, the process proceeds to step S511 and the current The valve opening is maintained, and the process returns to step S501. On the other hand, when the low temperature going-out temperature is outside the predetermined temperature range of the set temperature, for example, other than ± 1 ° C., the process proceeds to step S510, and it is determined whether or not the closed limit of the low temperature adjusting valve 62 is detected, and step S501. Return to.

  If the close limit of the low-temperature regulating valve 62 is detected in step S507 and the open limit is detected in step S510, the opening degree adjustment is difficult, so the adjustment operation is stopped. In step S507, step S508, and in step S510, step The process proceeds to S511 to maintain the current opening degree.

  By performing such stabilization control, the temperature of the low-temperature water LD with respect to the low-temperature heating load can be stabilized at a predetermined temperature, and inconvenience due to temperature change can be avoided.

  In the embodiment, water has been described as an example of the heat medium flowing through the heating circuit 4, but an antifreeze liquid, other liquids, or the like may be used.

As described above, according to the heat source device of the above embodiment, the following effects can be obtained.
a Heating medium is heated using a single heat source such as combustion heat, electric heat, exhaust heat, etc., and the heat of the heat medium is versatile and multifunctional, such as heating load, water heating, bath water Can be realized. Since the heat of the heating medium heated by a single heat source is selectively switched and supplied to the heating load, the second heat exchange means or the third heat exchange means, the heat exchange is highly efficient and the piping Along with simplification, equipment weight reduction, and compactness, it is possible to reduce equipment costs and simplify installation work. By simplifying the piping, it is possible to reduce the low pressure loss of the heating, hot water supply, and remedy circuits.
b When combustion heat such as fuel gas is used as a heat source, the combustion time can be reduced to increase the efficiency, and the Nox can be reduced and the pump power consumption can be reduced.
c Heat medium heating can be controlled by controlling the number of revolutions of the pump, and the demand for heating can be met immediately. As the hot water demand varies, the circulating hot water amount is varied, so that an appropriate hot water amount can be supplied for each hot water demand.
d Heating of the heat medium can be made highly efficient by heat exchange by latent heat recovery.
e By keeping the heat medium in the tank warm, the amount of heat can be used for hot water supply, heating, and bathtub reheating, the heating speed of hot water supply can be increased, and hot water supply can be speeded up. Since the amount of hot water required for hot water supply can be secured in advance, even when hot water demand such as bath water replenishment or heating occurs, fluctuations in hot water supply temperature can be suppressed and stable hot water supply is possible.
f Thermal distribution can be suppressed and high efficiency can be realized by heat distribution between hot water supply demand and heat radiation for heating or renewal of bathtub water.

The present invention relates to a heat source device that realizes versatility such as heating, hot water supply, bath tub retreat, etc. with a single heat source, preventing abrupt changes in heat medium temperature, continuing avoidance of mixing valve abnormality on the outlet side, etc. Available and useful.

It is a figure which shows the heat-source apparatus of this invention. It is a flowchart which shows a basic operation. It is a characteristic view which shows the amount of hot water supply required-pump rotation speed. It is a characteristic view which shows the amount of heat required for hot water supply and the number of heating request terminals-pump rotation speed. It is a characteristic view which shows hot water supply, heating, and the amount of additional heat required-pump rotation speed. It is a flowchart which shows heat retention operation | movement. It is a figure which shows the structure by the side of the heat source machine of the heat source apparatus which is an Example of this invention. It is a figure which shows the control system of the heat-source apparatus in the Example of this invention, and the structure by the side of a heating load. It is a flowchart which shows the basic control operation | movement of the heat-source apparatus which is an Example of this invention. It is a flowchart which shows pump rotation speed determination control. It is a flowchart which shows the pump speed determination control following FIG. It is a flowchart which shows the pump speed determination control following FIG. It is a flowchart which shows the pump speed determination control following FIG. It is a flowchart which shows the pump speed determination control following FIG. It is a flowchart which shows the pump speed determination control following FIG. It is a flowchart which shows hot water supply driving | operation operation | movement. It is a flowchart which shows the hot water supply driving | operation operation | movement following FIG. It is a flowchart which shows heating hot water circulation control. It is a flowchart which shows cold start control. It is a figure which shows the Example of danger prevention control. It is a flowchart which shows danger prevention control. It is a figure which shows the Example of low temperature adjustment control. It is a flowchart which shows low-temperature adjustment control.

Explanation of symbols

3 Heating load 3A High temperature heating load 3B Low temperature heating load 4 Heating circuit (circulation path)
10 Hot water (heat medium)
11 Heat source (heating means)
12 Burner (heating means)
21, 22 Heat exchanger (heat exchange means)
24 heat exchanger (heat exchange means, latent heat recovery heat exchange means)
26 Expansion tank 28 Circulation pump 40, 42, 49, 50, 52 Radiator (heating load)
66 Heat exchanger (second heat exchange means)
68 Distribution valve (supply switching means)
72 heat exchanger (third heat exchange means)
74 On-off valve (supply switching means)
124 Main control unit

Claims (2)

A tank for storing heat medium,
A heating load for circulating the heat medium;
A main circuit comprising a first on-off valve, and when the first on-off valve is opened, circulates the heating medium from the tank to the heating load and returns the tank to the tank;
A heat source,
A first heat exchanging means connected to the main circuit for circulating the heat medium and exchanging heat of the heat source to the heat medium;
The main circuit includes a second on-off valve that is branched from the outlet side of the first heat exchanging means and is directly connected to the tank. When the second on-off valve is opened, the heat from the main circuit A hot water supply and heating circuit for flowing a medium and returning it to the tank;
A second heat exchanging means connected to the hot water supply / heat circuit, for exchanging heat of the heat medium flowing through the hot water supply / heat circuit with hot water;
The main circuit is branched from the outlet side of the first heat exchanging means and is directly connected to the tank, and includes a third on-off valve. When the third on-off valve is opened, the heat is supplied from the main circuit. An additional heat circuit for flowing the medium and returning it to the tank;
A third heat exchanging means connected to the additional heat circuit, for exchanging heat of the heat medium flowing in the additional heat circuit to bath water;
A pump installed in the main circuit on the entry side of the first heat exchanging means to flow the heat medium of the tank to the main circuit side;
A mixing valve for mixing the hot water heated by the second heat exchange means and clean water ;
Detecting means for detecting abnormal operation of the mixing valve;
Upon receiving a heating request, a hot water supply request, or a bath water heating request, the first on-off valve is opened by a heating request, the second on-off valve is opened by a hot water request, the third on-off valve is opened by a bath water heating request, and the pump is And when the first on-off valve is opened, the heating medium of the tank is caused to flow to the heating load through the first heat exchange means in the main circuit, and the second on-off valve is opened. The heat medium in the tank flows through the first heat exchanging means in the main circuit to the second heat exchanging means, and the heat of the tank is opened when the third on-off valve is opened. The medium is passed through the first heat exchanging means in the main circuit to the third heat exchanging means and returned to the tank, and the amount of heat required by the heating request, the hot water supply request, and the bath water heating request is obtained. Depending on the amount of heat, the pump It controls the rotation number, when the detection means detects abnormal operation of the mixing valve, circulation operation of the heating medium to the second heat exchange means, heating operation of the heat source, or any tapping operation Control means for stopping the operation or two or more operations ;
Heat source apparatus comprising the. A tank for storing heat medium,
A heating load for circulating the heat medium;
A main circuit comprising a first on-off valve, and when the first on-off valve is opened, circulates the heating medium from the tank to the heating load and returns the tank to the tank;
A heat source,
A first heat exchanging means connected to the main circuit for circulating the heat medium and exchanging heat of the heat source to the heat medium;
The main circuit includes a second on-off valve that is branched from the outlet side of the first heat exchanging means and is directly connected to the tank. When the second on-off valve is opened, the heat from the main circuit A hot water supply and heating circuit for flowing a medium and returning it to the tank;
A second heat exchanging means connected to the hot water supply / heat circuit, for exchanging heat of the heat medium flowing through the hot water supply / heat circuit with hot water;
The main circuit is branched from the outlet side of the first heat exchanging means and is directly connected to the tank, and includes a third on-off valve. When the third on-off valve is opened, the heat is supplied from the main circuit. An additional heat circuit for flowing the medium and returning it to the tank;
A third heat exchanging means connected to the additional heat circuit, for exchanging heat of the heat medium flowing in the additional heat circuit to bath water;
A pump installed in the main circuit on the entry side of the first heat exchanging means to flow the heat medium of the tank to the main circuit side;
A mixing valve for mixing the hot water heated by the second heat exchange means and clean water;
Detecting means for detecting abnormal operation of the mixing valve;
A control method of a heat source device including the first on-off valve, the second on-off valve, the third on-off valve, driving of the pump, and control means for controlling the pump ,
Upon receiving a heating request, a hot water supply request, or a bath water heating request, the first on-off valve is opened by a heating request, the second on-off valve is opened by a hot water request, the third on-off valve is opened by a bath water heating request, and the pump is And when the first on-off valve is opened, the heating medium of the tank is caused to flow to the heating load through the first heat exchange means in the main circuit, and the second on-off valve is opened. The heat medium in the tank flows through the first heat exchanging means in the main circuit to the second heat exchanging means, and the heat of the tank is opened when the third on-off valve is opened. The medium is passed through the first heat exchanging means in the main circuit to the third heat exchanging means and returned to the tank, and the amount of heat required by the heating request, the hot water supply request, and the bath water heating request is obtained. Depending on the amount of heat, the pump It controls the rotation number, when the detection means detects abnormal operation of the mixing valve, circulation operation of the heating medium to the second heat exchange means, heating operation of the heat source, or any tapping operation the method of the heat source device which comprises a process of stopping the operation or two or more operations.

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