JP2020029974A - Heat source device - Google Patents

Abstract

To provide a heat source device capable of sufficiently obtaining hot water supply and air heating performances even though it is compact.SOLUTION: A combined heat exchanger 1 for hot water supply and heating is formed by arranging, adjacently to each other, a type 1 conduit line arranging part 111 in which only a liquid circulation conduit line 13 for hot water supply is arranged, and a type 2 conduit line arranging part 112 in which the liquid circulation conduit line 13 for hot water supply is arranged so as to be vertically sandwiched by a liquid circulation conduit line 12 for heating in contact with each other. A burner device 2 for hot water supply is arranged on the lower side of the type 1 conduit line arranging part 111, and a burner device 5 for heating is arranged on the lower side of the type 2 conduit line arranging part 112. A branch passage 65 is branched from a going-side conduit line 60 in which the liquid passing through a main heat exchanger for heating is caused to circulate toward a heating apparatus side. The branch passage 65 is connected to a return side conduit line 61 in which the liquid passing through the heating apparatus is returned to the side of the main heat exchanger for heating, and is thermally connected to a passage on an inlet side of a main hot water supply heat exchanger through a liquid-water heat exchanger 33 for hot water supply/heating connection.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a heat source device having a configuration in which a heating and hot water supply liquid flow conduit is heated by a common burner.

  Conventionally, for example, a one-can-two-channel heat exchanger integrated with a heat exchanger and a heat exchanger for reheating a bath is provided, and the one-can-two-channel heat exchanger is shared by a common burner. A heating type heat source device is used, and FIG. 13 schematically shows a cross-sectional configuration of the one-can-two-channel heat exchanger (see Patent Document 1, for example).

  As shown in the figure, in this one-can-two-channel heat exchanger 201, a hot water supply heat transfer tube 141 forming a hot water supply heat exchanger has a circulation heating heat transfer tube 142 forming a reheating heat exchanger. Are provided in contact with each other in such a manner as to vertically sandwich them. In the figure, common fins 143 are provided on the outer peripheral side of these heat transfer tubes 141 and 142. In this one-can-two-channel heat exchanger 1, as shown by the arrow A in the figure, water was introduced from one end side of the hot water supply heat transfer tube 141 arranged at the lowermost stage and heated by the burner. Water is drawn out through the hot water supply heat transfer tube 141 arranged at the uppermost stage to supply hot water, and at the time of reheating of the bath, the hot water passing through the central stage circulation heating heat transfer tube 142 is heated by the burner. .

  When such a one-can-two-channel heat exchanger 201 is provided to form a heat source device, the heat source device can be downsized compared to a case where a bath heat exchanger and a hot water supply heat exchanger are separately formed. There is an advantage that can be achieved.

Japanese Utility Model Publication No. 8-7307 Japanese Patent No. 4071224

  In recent years, in order to supply a heating medium such as hot water to a heating device such as a hot water mat or a bathroom dryer, a heat source device provided with a heating circuit connected to the heating device has been widely used. ing. In a heat source device having such a heating circuit, in order to reduce the size of the heat source device, in the configuration proposed in Patent Document 1, liquid is supplied to the heating device instead of a heat exchanger for reheating a bath. It is conceivable to provide a heat exchanger for heating for supplying the heat medium of this type to form a one-can-two-channel heat exchanger.

  In other words, for example, it is conceivable to provide a heat transfer tube for a heating heat exchanger instead of the circulating heating heat transfer tube 142 forming the reheating heat exchanger in the configuration of FIG. The heat pipe 141 is provided so as to sandwich the heat transfer pipe of the heat exchanger for heating up and down, but in this case, the heating capacity can be obtained only about the same as the reheating capacity. However, since the capacity required for heating is higher than the reheating capacity, there arises a problem that the required capacity for heating becomes insufficient.

  In the heat source device having a hot water supply function, the user performs hot water use in a kitchen or a washroom, or uses hot water using a shower in a bathroom. It is strongly desired that the hot water at the hot water supply set temperature set by the user be discharged from the shower nozzle in a sufficient amount according to the user's operation, such as when the temperature of the hot water is too low or the flow rate of the hot water is too low. Then I feel very uncomfortable. Moreover, the flow rate when using hot water with a shower in the bathroom is larger than when using hot water in a kitchen or washroom. It is also important for the heat source device to be able to supply hot water.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a heat source device which can sufficiently obtain hot water supply capacity and heating capacity even with a small size and can be used comfortably by a user. It is in.

  Means for Solving the Problems In order to achieve the above object, the present invention provides means for solving the problem with the following configuration. That is, the first invention provides a hot water supply heat exchanger, a hot water supply circuit having a function of heating water as a liquid heat medium by the hot water supply heat exchanger and supplying hot water to a hot water supply destination, a heating heat exchanger, A heating circuit provided with a heating circulation pump that circulates a liquid heat medium through the heating heat exchanger, and supplies the heating medium from the heating circuit to a heating device connected to the outside to supply the heating medium. The hot water supply heat exchanger is configured to circulate through the heating circuit, and the hot water supply heat exchanger includes a main hot water supply heat exchanger that recovers the sensible heat of the combustion gas of the burner device by a liquid circulation pipe forming the hot water supply heat exchanger. The heating heat exchanger has a main heating heat exchanger that recovers the sensible heat of the combustion gas of the burner device by a liquid circulation pipe forming the heating heat exchanger; The liquid flow conduit of the heat exchanger is the main heating The heat exchanger includes at least a part of a two-way pipe arrangement portion disposed in contact with each other so as to be sandwiched vertically by a liquid flow route of the heat exchanger, and the two types of liquid circulation of the two-way pipe installation portion A heat exchanger having a configuration in which a pipe is heated by a common burner device, and a liquid passing through the main heating heat exchanger is supplied to an outlet side of the main heating heat exchanger. A passage on the outgoing side for flowing toward the device side is formed, a return-side passage for returning the liquid passed through the heating device to the main heat exchanger for heating is formed, and the return-side passage is branched from the passage on the outgoing side. The leading end of the branched passage is connected to the return passage, and the branch passage is thermally connected to one of an inlet passage and an outlet passage of the main hot water supply heat exchanger. The configuration in which a liquid-water heat exchanger for hot water supply and heating thermal connection connected to It is a means for solving the problems I.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, at least one of the presence / absence of branching of the liquid passing through the main heating heat exchanger to the branch passage side and the branching flow rate is changed. The liquid branching variable means is provided.

  Further, according to a third invention, in addition to the configuration of the first or second invention, the hot water supply circuit has a latent heat recovery heat exchanger for recovering latent heat of the combustion gas, and the latent heat recovery heat exchanger is provided. The hot water supply heat exchanger is connected to the inlet side of the main hot water supply heat exchanger via a pipe line, and the liquid-water heat exchanger for hot water supply and heating thermal connection is connected to the hot water supply heat exchanger for latent heat recovery. It is characterized in that it is thermally connected to one of a pipeline between the main hot water supply heat exchanger and a passage on the outlet side of the main hot water supply heat exchanger.

  According to a fourth aspect of the present invention, in addition to the configuration of the first, second, or third aspect, a refueling circulation passage connected to the bathtub for reheating the bath water is provided. A reheating liquid-water heat exchanger for thermally connecting the passage and the branch passage is provided.

  In a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, the reheating liquid-water heat exchanger is more liquid-liquid in the branch passage than the hot water supply / heating thermal connection liquid-water heat exchanger. It is characterized by being provided on the upstream side of the flow.

  In a sixth aspect of the present invention, in addition to any one of the first to fifth aspects, the hot water supply circuit is configured to variably adjust a total amount of hot water supplied through the hot water supply circuit. A water volume servo is provided.

  According to the present invention, the liquid circulation pipes of the main hot water supply heat exchanger provided in the hot water supply circuit are in contact with each other so as to be vertically sandwiched by the liquid circulation pipes of the main heating heat exchanger provided in the heating circuit. A composite heat exchanger having at least a part of the two-type pipe arrangement portion provided, wherein the two types of liquid circulation lines of the two-type channel installation portion are heated by a common burner device. Therefore, the size of the heat source device can be reduced as compared with the case where the main hot water supply heat exchanger and the main heating heat exchanger are separately formed and provided, and the main hot water supply heat exchange The liquid circulation pipes of the heat exchanger for heating provided above and below the liquid circulation pipes of the vessel can be heated by the burner device so that a sufficient heating capacity can be obtained.

  Further, in the present invention, the lowermost (lowest position) passage in the two-type pipe arrangement portion is a liquid circulation pipe for heating, and the liquid (heat medium) flowing through this pipe is heated. If it is in a circulated state, it is warm, and even if its circulation is stopped, it is hardly in a cold state like a hot water supply liquid circulation pipe through which cold water is introduced from the water supply side. In addition, it is possible to prevent dew condensation from occurring in the liquid flow pipe of the composite heat exchanger.

  In the present invention, the main hot water supply heat exchanger has a liquid circulation pipe vertically sandwiched by the liquid circulation pipes of the main heating heat exchanger. Since the arrangement ratio of the liquid circulation line of the heat exchanger is smaller than the arrangement ratio of the liquid circulation line of the main heating heat exchanger, the heating of this component alone may cause insufficient hot water supply capacity, In contrast, the following configuration can sufficiently compensate for the shortage.

  In other words, in the present invention, the heating circuit has an outlet on the outgoing side of the main heating heat exchanger, and a liquid on the outgoing side for flowing the liquid passing through the main heating heat exchanger toward the heating device. A passage is formed, and a return-side passage for returning the liquid passing through the heating device to the main heating heat exchanger side is formed in the heating circuit, and a branch branched from the outgoing-side passage. The leading end of the passage is connected to the return passage. A liquid-water heat exchanger for hot water supply heating and thermal connection, wherein the branch path is thermally connected to one of an inlet side passage and an outlet side passage of the main hot water supply heat exchanger. Is provided, if necessary, the heat of the heating circuit can be transmitted to the hot water supply circuit side via the hot water supply / heating thermal connection liquid-water heat exchanger, thereby replenishing the shortage of the hot water supply capacity.

  Further, if a liquid branch variable means is provided for changing at least one of the presence or absence of a branch of the liquid passing through the main heating heat exchanger to the branch passage side and a flow rate at which the liquid is branched, the main heating heat is provided by the liquid branch variable means. By changing at least one of the presence or absence of branching of the liquid through the exchanger to the branch passage side and the branching flow rate, the heat of the heating circuit is supplied via the hot water supply / heating thermal connection liquid-water heat exchanger. At least one of the presence or absence of the operation to be transmitted to the hot water supply circuit side and the variable amount of heat to be transmitted can be performed.

  Therefore, when it is predicted that the heating-side capacity is insufficient by transmitting and giving the heating-side heat to the hot-water supply side, the heat of the heating circuit is transferred to the hot-water supply circuit via the hot-water supply / heating heat connection liquid-water heat exchanger. By not performing the operation to transmit to the side or reducing the heat to be transmitted, a decrease in the heating capacity can be suppressed. Conversely, only a small heating capacity is required, and it is necessary to compensate for the lack of capacity on the hot water supply side by transmitting the heat of the heating circuit to the hot water supply circuit side via the hot water supply / heating heat connection liquid-water heat exchanger. If it is predicted that there is, by performing the operation of transferring the heat of the heating circuit to the hot water supply circuit side via the hot water supply / heating heat connection liquid-water heat exchanger, or by increasing the heat transmitted in the operation , Can sufficiently supplement the hot water supply capacity.

  Further, the hot water supply circuit has a latent heat recovery heat exchanger for recovering latent heat of the combustion gas, and the latent heat recovery heat exchanger is connected to an inlet side of the main hot water supply heat exchanger through a pipeline. The liquid-water heat exchanger for hot water supply and heating thermal connection is connected to a pipeline between the latent heat recovery hot water supply heat exchanger and the main hot water supply heat exchanger and the main hot water supply heat exchanger. According to the configuration that is thermally connected to one of the outlet passages, the thermal efficiency can be improved by providing the hot water supply heat exchanger for latent heat recovery.

  In addition, when the liquid-water heat exchanger for hot water supply and heating thermal connection is connected to the inlet side of the hot water supply heat exchanger for latent heat recovery, heat is supplied from the heating circuit side via the hot water supply and heating thermal connection liquid-water heat exchanger. Is introduced into the hot water supply heat exchanger for latent heat recovery, and there is a concern that the heat efficiency may decrease.However, the liquid-water heat exchanger for hot water supply and heating thermal connection uses hot water for latent heat recovery. By connecting to a pipe between the heat exchanger and the main hot water supply heat exchanger or to a passage on the outlet side of the main hot water supply heat exchanger, it is possible to suppress the occurrence of the concern. And, as described above, heat can be transmitted from the heating circuit side to the hot water supply circuit side to supplement the lack of hot water supply capacity.

  Further, a reheating circulation passage is provided for reheating the bath water connected to the bathtub, and a reheating liquid-water heat exchanger for thermally connecting the reheating circulation passage and the branch passage is provided. In the configuration described above, the reheating operation of the bathtub can be improved by thermally connecting the liquid circulation pipe and the reheating circulation passage of the heating circuit via the reheating liquid-water heat exchanger. A heat source device can be formed.

  Further, in the configuration in which the reheating liquid-water heat exchanger is provided, the reheating liquid-water heat exchanger has a higher flow rate of the liquid in the branch passage than the hot water supply / heating thermal connection liquid-water heat exchanger. In the one provided on the upstream side of the flow, the following effects can be obtained.

  In other words, in this configuration, after the heat of the heating circuit is transmitted to the reheating circulation path via the reheating liquid-water heat exchanger, the heat is supplied via the hot water supply / heating heat connection liquid-water heat exchanger. Unlike the case where the heat of the heating circuit is transferred to the hot water supply circuit first, the amount of heat to be transferred to the additional heating circulation passage side can be suppressed from being short, so that the heat is transmitted to the user as described below. Very discomfort can be prevented.

  That is, the automatic filling of the bathtub is performed according to a predetermined sequence program, and the details thereof are various, but the filling is performed while performing the pouring from the hot water supply circuit side and the reheating of the poured hot water. Most of the time, it takes a long time to fill the hot water in a state where reheating is not performed sufficiently. For this reason, if the amount of heat transferred to the reheating circulation path side is insufficient, the automatic hot water filling time is prolonged, which makes the user very uncomfortable, but such a situation can be suppressed.

  Further, by providing a water amount servo for variably adjusting the total amount of hot water supplied through the hot water supply circuit in the hot water supply circuit, for example, reducing the total amount of hot water supply as necessary to reduce the hot water supply capability. Since the hot water supply temperature can be quickly raised and stabilized, the hot water supply temperature can be more stably performed. Once the hot water temperature is stabilized by reducing the total amount of hot water, the hot water capacity can be increased by subsequently increasing the total hot water quantity, so that the required hot water capacity can be adjusted. When there is no hot water supply, the operation of reducing the total amount of hot water supply is not performed, so that hot water supply according to the required hot water supply capacity can be performed.

FIG. 2 is a schematic explanatory diagram showing a system configuration of the heat source device of the first embodiment of the heat source device according to the present invention, together with a heating device and the like connected to the heat source device. It is explanatory drawing which shows typically the arrangement structure of the heat exchanger and burner apparatus in an Example. FIG. 4 is a block diagram illustrating a main configuration of a control configuration provided in the heat source device according to the embodiment. It is a typical perspective view (a) and a top view (b) for explaining composition of a burner device for hot water supply and heating applied to a heat source device of an example. It is a graph for explaining the relation between the combustion surface switching operation of the burner device and the hot water supply capacity when the heat source device of the embodiment operates in the hot water supply mode. It is a graph for demonstrating the relationship between the combustion surface switching operation of the burner device and the hot water supply capacity at the time of the hot water supply / heating simultaneous operation of the heat source device of the embodiment. It is a typical system explanatory view for explaining the system configuration modification of the heat source device of a 1st example. It is a typical explanatory view showing the system configuration of the heat source device of a 2nd example. It is a typical sectional explanatory view showing an example of arrangement of a heat exchanger and a burner device applied to other examples of a heat source device concerning the present invention. It is a typical explanatory view showing arrangement of a burner device in a heat source device of the present inventor leading to invention of a heat source device of an embodiment, and an aspect of a compound heat exchanger. FIG. 3 is a schematic explanatory view showing a configuration of a heat source device having a conventionally proposed composite heat exchanger. FIG. 12 is a schematic explanatory diagram for explaining the problem of the heat source device shown in FIG. 11 by simplifying the configuration of FIG. 11. FIG. 4 is a schematic explanatory view showing a configuration example of a conventionally proposed one-can-two-channel heat exchanger. FIG. 4 is a block diagram illustrating a control configuration for heating operation control and bath operation control of the heat source device. It is a graph which shows the example of the relationship data (PQ data) of the water level (P) of the bathtub used for filling a bathtub with water quantity (Q).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the present embodiment, the same reference numerals are given to the same names as those in the examples described so far, and the description thereof will be omitted or simplified.

  FIG. 1 schematically shows a system configuration of a first embodiment of the heat source device according to the present invention. As shown in the figure, the heat source device of the present embodiment is a composite heat source device formed by providing a hot water supply circuit 45 and a heating circuit 7 in an appliance case 80. This heat source device has a combustion chamber 100, and a burner device 2 (2a, 2b, 2c) for hot water supply and a burner device 5 for heating are provided in the combustion chamber 100.

  The burner device 2 for hot water supply has a plurality of burner devices 2a, 2b, 2c, and is formed in a manner formed by being divided by the combustion surface of the burner device 2a, the combustion surface of the burner device 2b, and the combustion surface of the burner device 2c. Has a burning surface. In other words, a divided combustion surface divided by each combustion surface of the burner devices 2a, 2b, 2c is formed, and in the heat source device, each time the combustion capacity required for the burner device 2 for hot water supply increases by one step. A combustion control means (not shown in FIG. 1) is provided for selectively and additionally burning the divided combustion surfaces in a predetermined order (in the order of the burners 2a, 2b and 2c). Below the burner device 2 for hot water supply and the burner device 5 for heating, a combustion fan 15 for supply and exhaust of these burner devices 2 and 5 is provided.

  Further, in the combustion chamber 100, a combined heat exchanger 1 for hot water supply and heating is provided above the burner device 2 for hot water supply and the burner device 5 for heating, and the combined heat exchanger 1 is shown in FIG. As shown in FIG. 2, a kind of pipe arranging part (a kind of flow path arranging part) 111 in which only the hot water supply liquid flow path 13 forming the main hot water supply heat exchanger is provided, Pipes arranged in contact with each other in such a manner that the liquid flow pipes 13 for heating and cooling are vertically sandwiched by the liquid flow pipes 12 for heating forming the main heat exchanger for heating (see FIG. 2). An arrangement portion 112 is provided, and the two-way conduit arrangement portion (two-way flow passage arrangement portion) 112 and the one-way conduit arrangement portion 111 are arranged adjacent to each other.

  As described above, in the present embodiment, the two-type pipe arrangement unit 112 of the composite heat exchanger 1 is connected to the liquid circulation pipe 13 of the main hot water supply heat exchanger by the liquid circulation pipe 12 of the main heating heat exchanger. The two-way pipe arrangement section 112 of this configuration constitutes a part of the composite heat exchanger 1. A heating burner device 5 for heating the two-way conduit arrangement part 112 is provided below the two-way pipeline arrangement part 112, and the liquid flow passage of the two-way conduit arrangement part 112 is provided. 12 and 13 are configured to be heated by a common (one) burner device (burner device 5 for heating).

  On the other hand, a burner device 2 for hot water supply for heating the one-sided pipe arranging part 111 is provided below the one-sided pipe arranging part 111, as shown in FIG. The liquid circulation pipes 12 and 13 provided in a part of the two-type pipe installation part 112 adjacent to the one-type pipe installation part 111 protrude above the hot water supply burner device 2. It is arranged.

  In this embodiment, with this configuration, even when the combustion gas of the heating burner device 5 spreads to the kind of the pipe arrangement portion 111 side when only the heating burner device 5 is burned, the spread portion is used for hot water supply. Since the liquid flow conduits 12, 13 of the two-pipe conduit arrangement portion 112 disposed in a manner protruding above the burner device 2 are disposed, it is heated by the spread combustion gas. The liquid circulation pipes 12 and 13 of the two-type pipe arrangement section 112 are used.

  Since the two-way pipe arrangement section 112 is arranged so as to vertically sandwich the hot water supply liquid flow path 13 by the heating liquid flow path 12, the combustion of the heating burner device 5 is prevented. Heated by the spread of the gas is the heating liquid circulation pipe 12 disposed below the hot water supply liquid circulation pipe 13. Therefore, it is possible to prevent the liquid supply pipe 13 for hot water supply provided on the side of the pipe installation section 111 from being heated by the burner device 5 for heating during the heating alone operation. It is possible to suppress the boiling of the heat medium such as water staying in the hot-water supply liquid circulation pipe 13 disposed on the arrangement section 111 side.

  The composite heat exchanger 1 has fins 43, which are provided so as to rise above the hot water supply burner device 2 and the heating burner device 5 in a direction perpendicular to the plane of FIG. (In the left-right direction in FIG. 1), a plurality of the fins 43 are arranged in the plane direction of the fins 43, as shown in FIG. 2, and the arrangement of the burner devices 2a, 2b, 2c for hot water supply. The direction is orthogonal to (or substantially orthogonal to) the direction. The liquid flow conduits 13 of the one-type conduit arrangement part 111 and the liquid flow conduits 12 and 13 of the two-type conduit arrangement part 112 are both inserted into the corresponding conduits formed on the plurality of common fins 43. The liquid heat pipes 13 are inserted into the holes 103 and 104 (the liquid flow pipe 13 is inserted into the pipe insert hole 103, and the liquid flow pipe 12 is inserted into the pipe insert hole 104). Very easy to manufacture when formed.

  Also, in the two-type pipe arrangement section 112, of the three pipes (the liquid flow pipe 12 for heating and the liquid flow pipe 13 for hot water supply) arranged in the vertical direction, the middle pipe is The following effects can be obtained by using the liquid flow conduit 13 into which low-temperature water is introduced. In other words, depending on the arrangement of the heating liquid circulation pipe 12 and the hot water supply liquid circulation pipe 13 in the two-type pipe arrangement section 112, the heat absorption amount of the heating liquid circulation pipe 12 and the liquid circulation for the hot water supply. There is a difference between the heat absorption amount on the side of the pipe 13 and the middle pipe in the vertical direction in the two-way pipe arrangement portion 112 is provided in a manner to be in contact with each other as the liquid circulation pipe 13 for hot water supply. The configuration is such that the amount of heat absorbed per liquid flow passage 13 can be increased.

  Although FIG. 1 is a system diagram, it is shown differently from the embodiment of FIG. 2; The liquid circulation pipes 13 and the liquid circulation pipes 12 and 13 of the two-type pipe arrangement part 112 are provided. However, since FIG. 2 is also a schematic configuration diagram, the number and the like of the liquid circulation pipes 12 and 13 are not always shown accurately, and the number and arrangement of the liquid circulation pipes 12 and 13 are not always shown. The intervals and the like are not limited to those shown in FIG. 1, but are set appropriately.

  In this embodiment, a hot water supply heat exchanger 4 for recovering the latent heat of the combustion gas of the burner devices 2 and 5 is connected to the hot water supply liquid flow path 13 forming the main hot water supply heat exchanger. A heating heat exchanger 6 for recovering latent heat for recovering latent heat of the combustion gas of the burner devices 2 and 5 is connected to a heating liquid circulation pipe 12 which forms a main heating heat exchanger. ing. The hot water supply heat exchanger 4 for latent heat recovery and the heat exchanger 6 for heating use the heat medium (here, water) passing through the liquid circulation pipes forming the respective heat exchangers to form the burner devices 2 and 5. The latent heat of the combustion gas is recovered. Both the hot water supply heat exchanger 4 for latent heat recovery and the heating heat exchanger 6 recover not only the latent heat of the combustion gas of the burner devices 2 and 5 but also the sensible heat. It is.

  In addition, both the hot water supply heat exchanger 4 for latent heat recovery and the heating heat exchanger 6 for latent heat recovery are disposed on the upper side of the combined heat exchanger 1, and the provision of the hot water supply heat exchanger 4 for latent heat recovery is provided. A partition 115 that separates the space from the space in which the heating heat exchanger 6 for recovering latent heat is provided is provided on the upper side of the composite heat exchanger 1. The partition 115 allows the combustion gas (exhaust gas) of the heating burner device 5 to pass through the combined heat exchanger 1 and then pass through the space in which the latent heat recovery heating heat exchanger 6 is disposed. Is discharged from the exhaust port 116 through the space in which the hot water supply heat exchanger 4 is disposed. That is, the heating heat exchanger 6 for latent heat recovery is disposed upstream of the flow of the combustion gas of the heating burner device 5 passing through the combined heat exchanger 1, and the latent heat recovery heat exchanger 6 is disposed downstream of the flow. A hot water supply heat exchanger 4 is provided.

  With such a configuration, after the combustion gas in the combustion of the heating burner device 5 passes through the combined heat exchanger 1, the heating heat exchanger 6 for latent heat recovery is disposed at about 160 to about 250 ° C. After the latent heat is recovered and cooled by passing through the passage, it passes through the area where the hot water supply heat exchanger 4 for latent heat recovery is provided. Of water in the hot water supply heat exchanger 4 can be suppressed. Further, the heating heat exchanger 6 for latent heat recovery is disposed above the hot water supply heat exchanger 4 for latent heat recovery via the partition 115, and is used when the burner device 2 for hot water supply is used alone. However, the boiling of water in the heat exchanger 6 for latent heat recovery can be suppressed.

  Since FIG. 1 and FIG. 8 to be described later are system diagrams, the arrangement of the hot water supply heat exchanger 4 for latent heat recovery and the heating heat exchanger 6 for latent heat recovery is also different from the embodiment of FIG. In practice, a hot water supply heat exchanger 4 for latent heat recovery, a heating heat exchanger 6 for latent heat recovery, and the like are provided in a manner similar to the schematic sectional configuration diagram shown in FIG. Have been. However, the number, arrangement intervals, and the like of the hot water supply heat exchanger 4 for latent heat recovery and the heating heat exchanger 6 for latent heat recovery are not limited to those shown in FIG. is there.

  As shown in FIG. 1, the outlet side of the main heating heat exchanger (the heating liquid flow conduit 12 forming the main heating heat exchanger) passes through the main heating heat exchanger. A pipe 60 is formed as a passage on the outgoing side for allowing the liquid (hot water) to flow toward the heating devices 70 and 71, and the liquid (water) passing through the heating devices 70 and 71 is used for heating heat for latent heat recovery. A conduit 61 is formed as a return-side passage returning to the exchanger, and a distal end side of a branch passage 65 branched from the conduit 60 is connected to the conduit 61. A liquid / water heat exchanger 33 for thermal connection between hot water supply and heating is provided which is thermally connected to one of the entrance passage and the exit passage (here, the entrance side) of the main hot water supply heat exchanger. .

  The liquid-water heat exchanger 33 for hot water supply and heating thermal connection is thermally connected to a pipeline between the hot water supply heat exchanger 4 for latent heat recovery and the main hot water supply heat exchanger. A post-heat-exchange water temperature detecting means 133 for detecting the temperature of water passing through the liquid-water heat exchanger 33 for thermal connection is provided.

  As shown in FIGS. 4A and 4B, in this embodiment, the hot water supply burner device 2 (2 a, 2 b, 2 c) has a plurality of flame ports 110 arranged and arranged along the longitudinal direction. A plurality of burners 107 having a combustion surface in which one or more rows of flame ports are arranged (here, one row) are arranged and formed in such a manner as to be arranged in a direction orthogonal to the row of flame ports. The burner device 2a is formed by four burners 107, the burner device 2b is formed by three burners 107, and the burner device 2c is formed by six burners 107, and therefore, the respective burner devices 2a and 2b. , 2c is approximately 4: 3: 6. The heating burner device 5 is formed by arranging nine burners 109 in which the flame ports 110 are arranged in the same direction as the burners 107 forming the hot water supply burner device 2.

  Fuel gas is supplied to the hot water supply burner device 2 and the heating burner device 5 through a gas supply passage 16 shown in FIG. 1, and reference numerals 14 and 17 in FIG. A solenoid valve 18 is a gas proportional valve.

  4 and 2, the combined heat exchanger provided above each combustion surface of the hot water supply burner device 2 (2a, 2b, 2c) and the heating burner device 5. The first hot-water supply liquid flow path 13 and the heating liquid flow path 12 of the composite heat exchanger 1 are arranged below the corresponding liquid flow paths 12, 13, respectively. The burner device 5 and the hot-water supply burner device 2 (2a, 2b, 2c) are provided so as to have a pipe portion extending in parallel or substantially parallel to the row of the flame ports 110. The liquid circulation pipes of the hot water supply heat exchanger 4 for latent heat recovery and the heating heat exchanger 6 for latent heat recovery also have pipe sections extending in parallel or substantially parallel to the rows of the flame ports 110 of the burner devices 2 and 5. The liquid flow conduits of the hot water supply heat exchanger 4 for latent heat recovery and the heating heat exchanger 6 for latent heat recovery are disposed on the upper surface side of both burner devices 2 and 5 as a whole. Has been established.

  FIG. 11 is a schematic explanatory view showing the configuration of a heat source device having a combined heat exchanger proposed in Patent Document 2. In this heat source device, a burner device for hot water supply is shown. 2 and a burner device 102 for reheating the bath. On the upper side of the hot water supply burner device 2 and the additional heating burner device 102, a combined heat exchanger 101 of hot water supply and additional heating is provided, and the hot water supply burner device 2 and the additional heating device are provided. On the lower side of the burner device 102, a combustion fan 15 for supplying and exhausting the burner device is provided.

  The combined heat exchanger 101 has fins 43 provided so as to extend over the upper side of the burner device 2 for hot water supply and the upper side of the burner device 102 for reheating, and the fins 43 are perpendicular to the paper surface. Are arranged in a variety of directions with an interval therebetween. Pipe insertion holes 103 and 113 are formed in each of the fins 43, and pass through the respective pipe insertion holes 103 and 113, and are connected to a liquid supply pipe (water supply pipe) 13 for hot water supply and a reheating tank 13. A liquid circulation pipe (water passage) 105 is provided.

  In the heat source device having such a combined heat exchanger 101, the heat source device is different from the case where the heat exchanger for hot water supply and the heat exchanger for reheating are separately formed and arranged in the heat source device. However, as shown in FIG. 12A, for example, when the burner device 102 for reheating alone burns, the combustion gas of the burner device 102 for reheating expands as shown in FIG. As shown by the arrow in the figure, the hot water supply liquid circulation line 13 adjacent to the vicinity of the reheating liquid circulation line 105 is also heated, and thus stays in the liquid circulation line 13. There was a problem that boiling water was boiling.

  Further, as shown in FIG. 12 (b), when the burner device 2 for hot water supply burns alone, the combustion gas of the burner device 2 for hot water supply expands, and as shown by the arrow in the figure, the liquid flow for hot water supply There is also a problem that the reheating liquid circulation pipe 105 adjacent to the pipe 13 is also heated, and the water staying in the liquid circulation pipe 105 boils. Therefore, for example, as shown in FIG. 10, the type-one pipe arranging part 111 is arranged at a position corresponding to the combustion surface of the hot water supply burner device 2, and the type-two pipe laying part 112 is connected to the heating burner device. A similar problem may occur if it is arranged at a position corresponding to the combustion surface of No. 5.

  In the invention described in Patent Document 2, as shown in FIG. 11, for example, a space above a hot water supply burner device 2 and a space above a reheating burner device 102 are partitioned. It has been proposed that a partition 106 is provided, and the partition 106 is formed by, for example, arranging two stainless steel plates 106a and 106b so as to face each other with an interval therebetween, and to allow air to pass through the interval. I have. In this way, even if the volume of the combustion gas expands when the burner devices 2 and 102 are independently burned, only the liquid circulation pipes 13 and 104 provided above the respective burner devices 2 and 102 correspond to the burner devices. It is described that the fuel gas is heated by the combustion gases 2 and 102 so that the combustion gas does not hit the adjacent liquid circulation pipes 104 and 13.

  However, in the configuration in which such a partition is provided, there is a problem that the provision of the partition or the configuration for passing the wind complicates the structure and increases the manufacturing cost. Will happen.

  On the other hand, in the present embodiment, as shown in FIG. 2, a burner device for hot water supply is provided below the type-one pipe arranging part 111, and below the type-two pipe laying part 112. Although the burner device 5 for heating is provided, the liquid circulation pipes 12 and 13 which are provided on a part of the two-type pipe installation part 112 on the side adjacent to the one-type pipe installation part 111 are provided. Is arranged in such a manner as to protrude above the hot water supply burner device 2, so that the liquid in the one-way conduit arrangement portion 111 can be provided without providing a partition as in the invention proposed in Patent Document 2. Boiling of the water in the flow conduit 13 can be suppressed.

  That is, when the burners 2 and 5 burn, the volume of the combustion gas in the burners 2 and 5 expands. Therefore, the heating burner 5 disposed below the two-way conduit arrangement portion 112 is used alone. When the fuel is combusted, the combustion gas spreads also to the one-sided pipe arranging portion 111 side, but is disposed on a part of the two-sided line arranging portion 112 on the side adjacent to the one-sided pipe arranging portion 111. Since the liquid circulation pipes 12 and 13 are arranged so as to protrude above the hot water supply burner device 2, they are heated by the spread combustion gas. , 13.

  Since the two-way pipe arrangement section 112 is arranged so as to vertically sandwich the hot water supply liquid flow path 13 by the heating liquid flow path 12, the combustion of the heating burner device 5 is prevented. Heated by the spread of the gas is the heating liquid circulation pipe 12 disposed below the hot water supply liquid circulation pipe 13. Therefore, it is possible to prevent the liquid supply pipe 13 for hot water supply provided on the side of the pipe installation section 111 from being heated by the burner device 5 for heating during the heating alone operation. It is possible to suppress the boiling of the heat medium such as water staying in the hot-water supply liquid circulation pipe 13 disposed on the arrangement section 111 side.

  Therefore, during the heating alone operation (when the hot-water supply burner device 2 is stopped and only the heating-use burner device 5 is burned, and the flow of the heat medium in the hot-water supply liquid flow path 13 is stopped). The burner device 5 for heating can be continuously burned, or the time of combustion off can be shortened even in the case of performing intermittent operation in which the heating burner device 5 is repeatedly turned on and off during the single heating operation. Therefore, the heating capacity can be improved. Also, unlike a configuration in which a partition is provided between the upper space of the heating burner device 5 and the upper space of the hot water burner device 2, the structure can be simplified and the number of parts can be reduced, so that the cost can be reduced. .

  In the composite heat exchanger 1 applied to the present embodiment, when only the hot water supply burner device 2 disposed below the one-type pipeline arrangement portion 111 burns, the burner on the hot water supply side is burned. The volume of the combustion gas in the apparatus 2 expands, and the combustion gas also spreads to the two-type pipe arrangement portion 112 side, and the heating liquid circulation pipe 12 protruding above the hot water supply burner 2, The heating liquid flow pipe 12 adjacent to the protruding heating liquid flow pipe 12 is also heated by the combustion gas of the hot water supply burner device 2.

  Therefore, the liquid heat medium staying in the heating liquid circulation pipe 12 is heated by the combustion gas of the hot water supply burner device 2. Since the hot water supply liquid flow path 13 is provided between the heating liquid flow path 12 and the water passing through the hot water supply liquid flow path 13, Since the heat of the heat medium inside is radiated, it is possible to prevent the heat medium staying in the liquid flow pipe 12 for heating from boiling.

  Further, the lowermost (lowest position) passage in the two-type pipe arrangement portion 112 of the composite heat exchanger 1 is a heating liquid circulation pipe 12, and the liquid (heat medium) flowing through this pipe is: If it is heated and circulated, it will be warm, and even if its circulation is stopped, it will be cold as in the hot water supply liquid flow pipe 13 in which cold water is introduced from the water supply side. Since there is almost no dew, it is possible to prevent the dew condensation from occurring in the liquid flow pipe 12 of the composite heat exchanger 1.

  As shown in FIG. 1, in the present embodiment, the hot water supply circuit 45 includes a hot water supply heat exchanger 4 for recovering latent heat, and a water supply passage 46 provided on the water inlet side of the hot water supply heat exchanger 4 for recovering latent heat. A passage 34 provided on the outflow side of the hot water supply heat exchanger 4 for latent heat recovery; a liquid supply pipe 13 (main hot water supply heat exchanger) for hot water supply of the composite heat exchanger 1; And a hot water supply passage 47 provided on the water outflow side of the hot water supply liquid flow path 13.

  The hot water supply circuit 45 is a hot water supply liquid flow passage 13 (main line) of the combined heat exchanger 1 which is a heat medium of a liquid introduced from the water supply passage 46 and heated through the hot water supply heat exchanger 4 for latent heat recovery. This is a circuit for introducing the heated water into a hot water supply destination through a hot water supply passage 47 after being introduced into a hot water supply heat exchanger) and heated. In the hot water supply circuit 45, the water supply passage 46 is provided with a water amount sensor 19 as a flow rate detecting means for detecting the amount of water passing through the water supply passage 46, and the water supply high limit switch 36 is provided in the passage 34, A hot water supply pipe thermistor 151 is provided in the middle of the hot water supply liquid flow path 13 of the composite heat exchanger 1.

  Further, the hot water supply passage 47 is provided with a heat exchange side thermistor 23 for detecting an outlet temperature of the liquid supply pipe 13 for hot water supply of the composite heat exchanger 1 and a hot water supply thermistor 24 for detecting a hot water supply temperature. ing. In the present embodiment, a method of calculating the incoming water temperature by calculation without using an incoming water temperature detecting means for detecting the incoming water temperature for hot water supply is applied (not shown, but the supplied water temperature detecting means for calculating the incoming water temperature). For example, at the time of stable combustion of the hot water supply burner device 2, the incoming water temperature is back-calculated from the combustion amount, the water amount, and the outlet water temperature, and this is stored. Since the heat source device of the system for calculating the hot water supply temperature by calculation is well known, the description thereof is omitted, but the hot water supply temperature can be obtained by an appropriate method.

  The hot water supply passage 47 is provided with a water amount servo 20 for variably adjusting the total amount of hot water supplied through the hot water supply circuit 45, and the hot water supply passage 47 is connected to the water supply passage 46 via the hot water bypass passage 22. The bypass servo 21 is provided at a connection portion between the bypass passage 22 and the water supply passage 46.

  The heating circuit 7 includes a heating liquid circulation passage 8, and the heating liquid circulation passage 8 includes a heating heat exchanger 6 for recovering the latent heat, a heating circulation pump (heating liquid circulation pump) 9, , Cistern 10, heating high temperature thermistor 40, heating high limit switch 77, heating water pipe thermistor 52, heating low temperature thermistor 41, and heating circulation pump 9 is combined with heating heat exchanger 6 for latent heat recovery. The heat exchanger 1 has a function of circulating a liquid heat medium (for example, water) through the heating liquid flow pipe 12.

  The heating liquid circulation passage 8 has passages 59 to 65, 108, and the passage 108 does not allow the heat medium (for example, water) in the heating circuit 7 to pass through the heating heat exchanger 6 for latent heat recovery. It functions as a latent heat exchange bypass passage for circulation to the air. The passage 108 is provided with a passage 119 provided with a low-temperature capacity switching valve 118, and the passage 108 is provided with an orifice at a portion R in the drawing. The passage 119 and the low-temperature capacity switching valve 118 can be omitted in some cases. The heating high-temperature thermistor 40 detects the temperature of the heat medium on the exit side of the main heating heat exchanger (the heating liquid flow pipe 12 forming the main heating heat exchanger), The thermistor 41 detects the temperature of the heat medium on the input side of the main heating heat exchanger.

  The capacity of the cistern 10 is, for example, 1800 cc, and the cistern 10 is provided with the water level electrode 44 and the overflow passage 66. The cistern 10 is connected to the water supply passage 46 via the supply water electromagnetic valve 42 and the water supply passage 165.

  Further, in this embodiment, the hot water supply circuit 45 and the heating circuit 7 are thermally connected via a hot water supply / heating thermal connection liquid-water heat exchanger 33. The liquid / water heat exchanger 33 for hot water supply and heating thermal connection is connected to a branch passage 65 branched from the outlet 61 of the heating liquid circulation pipe 12 forming the combined heat exchanger 1 by a latent heat in the hot water supply circuit 45. It is thermally connected between the hot water supply heat exchanger 4 for recovery and the hot water supply liquid flow path 13 (the main hot water supply heat exchanger) forming the combined heat exchanger 1.

  In addition, an appropriate heating device is connected to the heating circuit 7. In this figure, heating devices 70 and 71 are connected to the heating circuit 7 via external passages 72, 73 and 74, and the heating circuit 7 has a function of supplying a heating medium to the heating devices 70 and 71. . The heating device 70 is, for example, a high-temperature heating device such as a bathroom dryer, and the heating device 70 is provided with a thermal valve 76. On the other hand, the heating device 71 is a low-temperature heating device such as a hot water mat, and is provided with a thermal valve 48 that selectively switches a connection between the passage in the appliance case 80 of the heating liquid circulation passage 8 and the external passage 73, The supply of the heat medium to the heating device 71 is controlled.

  Further, in the heat source device of this embodiment, the heating liquid circulation passage 8 of the heating circuit 7 is thermally connected to the bath reheating circulation passage 26 via the reheating liquid-water heat exchanger 25. . The reheating circulation passage 26 is provided with a reheating circulation pump 27, a bath thermistor 28, a flowing water switch 29, a water level sensor 30, and a bath going thermistor 31, and the reheating circulation passage 26 is connected to a bathtub via a circulation fitting 81. 75.

  The reheating liquid-water heat exchanger 25 is provided on the upstream side of the flow of the liquid in the branch passage 65 with respect to the hot water supply / heating thermal connection liquid-water heat exchanger 33, and the reheating liquid-water heat exchanger 25 is provided. On the inlet side of the water heat exchanger 25, a reheating liquid flow control valve 32 is provided. The reheating liquid flow control valve 32 determines whether or not the heat medium (here, water) circulating in the heating circuit 7 is introduced into the branch passage 65 and adjusts the amount of introduction, by opening and closing the valve and opening the valve. It functions as a liquid branch variable means that switches depending on the amount.

  The reheating liquid flow rate control valve 32 is controlled by the control of a liquid branch variable control means described later, and the reheating liquid-water is controlled by adjusting the presence / absence of the heat medium to the branch passage 65 side and the amount of introduction. Whether or not the heat medium is introduced into the heat exchanger 25 and the liquid-water heat exchanger 33 for the hot water supply / heating thermal connection is adjusted and the amount of the heat medium is adjusted. Further, in the reheating liquid-water heat exchanger 25, heat exchange between the heat medium introduced from the branch passage 65 and water circulating in the reheating circulation passage 26 is performed, so that reheating of the bathtub hot water is performed. When a heat medium is introduced from the branch passage 65 side in the hot water supply / room heating thermal connection liquid-water heat exchanger 33, heat exchange between the heat medium and the hot water supply circuit is performed.

  As described above, by driving the reheating circulating pump 27 while opening the reheating liquid flow rate control valve 32 and introducing water (hot water) to the reheating liquid-water heat exchanger 25, the bath is heated. Although reheating is performed, heat exchange between the heat medium passing through the heating circuit 7 and water in the reheating circulation passage 26 is not performed if the reheating circulation pump 27 is stopped (to be precise, reheating circulation). Part of the water staying in the passage 26 undergoes heat exchange, but hardly exchanges heat).

  1, reference numeral 49 denotes a pouring passage, reference numeral 50 denotes a pouring solenoid valve, reference numeral 79 denotes a pouring amount sensor, reference numeral 37 denotes a drain collecting means, reference numeral 38 denotes a drain passage, and reference numeral 39 denotes a drain neutralizer. , Reference numeral 76 indicates a thermal valve.

  Although a remote control device is not shown in FIG. 1, the remote control device is connected to the control device of the heat source device by a signal. In the following description, the remote control device is denoted by reference numeral 53 as appropriate. I do. In addition, in a residence such as a home, a remote control device 53 provided with a hot water supply temperature setting, a reheating switch, an automatic switch (operation switch for automatic hot water filling) and the like is provided in a kitchen or a bathroom for supplying hot water. Is provided with a remote control device 53 with a switch for performing bathroom drying (heating device), and a remote control device 53 with a floor heating (heating device) switch and the like in the living room. Are often provided, but these are collectively referred to as the remote control device 53, and in the description with reference to FIG. 14 described later, the remote control devices 167, 168, and 169 will be described.

  In this embodiment, the hot water supply operation is performed, for example, as follows. That is, in a state where the operation of the remote control device 53 is on, when a user of the heat source device opens a hot water tap (not shown) provided at a distal end side of the hot water supply passage 47, the hot water is introduced from the water supply passage 46. Water is introduced into the hot water supply passage 47 through the hot water supply heat exchanger 4 for latent heat recovery and the hot water supply liquid passage 13 (the main hot water supply heat exchanger) of the combined heat exchanger 1, and the water amount sensor 19 is provided. When the operating flow rate of the hot water reaches a predetermined operating flow rate of the hot water, combustion control of the burner device 2 and rotation control of the combustion fan 15 are appropriately performed by the control means. It is formed and supplied to the hot water supply destination (usually based on the set temperature of hot water, the flow rate detected by the water amount sensor 19, the temperature detected by the detecting means of the incoming water temperature, or the temperature estimated by the incoming water temperature estimating means. Forward control is performed). Note that, if necessary, combustion of the heating burner device 5 is also performed, but a detailed description of this operation will be described later.

  When the automatic switch provided on the remote control device 53 is turned on, hot water of the hot water set temperature previously set in the remote control device 53 is formed in the same manner as in the hot water supply operation, and the hot water is poured. When the electromagnetic valve 50 is opened, hot water is filled from the hot water supply passage 47 to the bathtub 75 through the hot water supply passage 49.

  On the other hand, when the heating heat medium (liquid) is supplied from the heating liquid circulation passage 8 to the heating devices 70 and 71 without performing hot water supply (for example, by operating a clothes dryer, a bathroom heater / dryer, a floor heater, etc.). In the heating only operation), the liquid (here, hot water) is circulated by driving the heating circulation pump 9, and the liquid discharged from the discharge side of the heating circulation pump 9 is indicated by an arrow A in FIG. As shown in (1), the liquid is introduced into the heating liquid flow pipe 12 (main heating heat exchanger) of the combined heat exchanger 1 through the passage 59. At this time, combustion of the heating burner device 5, rotation control of the combustion fan 15, and the like are appropriately performed to heat the liquid.

  The liquid that has passed through the heating liquid flow pipe 12 of the combined heat exchanger 1 is then introduced into the hot water supply / heating thermal connection liquid-water heat exchanger 33, where the hot water supply / heating thermal connection liquid-water heat is supplied. The liquid that has passed through the exchanger 33 passes through a passage 60 as shown by an arrow C and then branches off at a passage 64, one of which is, for example, a heating liquid circulation passage 8 as shown by an arrow D. When the high-temperature side heating device 70 connected to the heater operates, it is supplied to the high-temperature side heating device, and after passing through the high-temperature side heating device 70, returns to the passage 61 side as shown by the arrow D '. Then, as shown by the arrow F, it is introduced into the cistern 10. At this time, for example, when the heating switch (SW) of the bathroom heater / dryer is turned on (ON), the corresponding thermal valve 76 in the heating device 70 on the high temperature side is opened, and the heating device 10 in the heating device 10 on the high temperature side is opened. In response to the signal from the control device, the outgoing temperature of the heating heat medium is maintained at a high temperature (for example, 80 ° C.).

  When the high-temperature side heating device is not operating, the thermal valve 76 in the high-temperature side heating device 70 is closed, and the liquid that has passed through the passage 64 as indicated by arrow D is indicated by arrow H. Through the latent heat exchange bypass passage 108 to the cistern 10, and returns to the suction side of the heating circulation pump 9 through the passage 62 as shown by the arrow G.

  Further, for example, when the reheating switch (SW) is turned on (ON) in the bathroom, the corresponding reheating liquid flow control valve 32 is in an open state, and the liquid branched off in the passage 64 after passing through the passage 60 ( The heat medium) passes through the liquid-water heat exchanger 25 for reheating, passes through the passage 65, and moves toward the passage 61 as indicated by an arrow E '. In this way, the hot water in the bath tub 76 is circulated in the reheating circulation passage 26 while passing the liquid maintained at a high temperature through the reheating liquid-water heat exchanger 25, so that the reheating of the bath is appropriately performed. The liquid passing through the passage 61 returns to the suction side of the circulation pump 9 for heating through the cistern 10 and the passage 62 as described above.

  In addition, Legionella bacteria and Escherichia coli may be generated in the bath water. However, in this embodiment, the bathtub water is insulated from the hot water passing through the heating-side circuit by the reheating liquid-water heat exchanger 25, and further, the hot water (city water) and the heating circuit passing through the hot water supply circuit 45. 7 is insulated from the heat medium (here, hot water) passing through the hot water supply and heating thermal connection liquid-water heat exchanger 33, so that the bathtub hot water and the hot water supply water are hot water supply and heating thermal connection liquid-water. The heat exchanger 33 and the reheating liquid-water heat exchanger 25 are double insulated. In addition, since the heat medium circulating in the heating circuit 7 is configured to circulate at a temperature of 60 ° C. or higher, an insulated state cannot be maintained due to a pinhole or the like in the liquid-water heat exchanger 25 for reheating. Even if such a condition occurs and fungi generated in the bathtub hot water mix into the heating circuit 7 side, the bacteria are heat-sterilized, so there is no possibility that the fungi mix into the hot water in the hot water supply circuit 45 side.

  In addition, a passage 63 for supplying a liquid to a low-temperature side heating device 71 such as a hot water mat is connected to the discharge side of the heating circulation pump 9. For example, floor heating is performed by a remote control device 53 in the living room. When it is turned on, a liquid maintained at a low temperature (for example, an outgoing temperature of 60 ° C.) for heating is supplied to an appropriate low-temperature side heating device 71 (for example, a hot water mat or the like) in accordance with opening and closing of the corresponding thermal valve 48. Is done.

  The temperature control when supplying the liquid to the heating device 70 on the high-temperature side and the temperature control when supplying the liquid to the heating device 71 on the low-temperature side, and the operation is performed in a state where the heating liquid circulation passage 8 is cold. Appropriate controls such as temperature control at the time of cold start, control at the time of reheating of the bath, and the like, combustion control of the burner device 5 for heating and rotation control of the combustion fan 15 are performed as necessary. As an example of the heating operation control and the hot water filling and reheating control of the bathtub, there is a control example using a control configuration as shown in FIG. 14, which will be briefly described below. And other well-known appropriate control methods and appropriate control methods proposed in the future.

  The control configuration shown in FIG. 14 is configured such that a control device 54 having a combustion control means 52 is signal-connected to remote control devices 167, 168, and 169 as heat source devices. In the figure, remote control device 167 is a bath remote control device, remote control device 168 is a remote control device for heating device (high-temperature heating device) 70, and remote control device 169 is a remote control device for heating device (low-temperature heating device) 71. is there. The remote controller 167 is provided with a bath set temperature input operation unit 163, a reheating switch 160, and a bath automatic switch 164. The remote controller 168 has a heating operation switch 161 and the remote controller 169 has a heating operation switch 166. Is provided.

  The heating operation switches 161 and 166 are switches that issue ON / OFF operation commands for operation of the corresponding heating devices 70 and 71, and both ON / OFF signals of the heating operation switches 161 and 166 are applied to the combustion control unit 52. When the heating operation switch 161 is turned on, power is supplied to the thermal valve 76 of the heating device 70, and after a predetermined time (for example, one minute), the thermal valve 76 opens (PTC (positive temperature coefficient; positive). When the heating operation switch 161 is turned off, the energization of the thermal valve 76 is stopped, and after a lapse of a predetermined time (for example, 20 seconds), the thermal valve 76 is turned off. Closes. When the heating operation switch 166 is turned on, the combustion control means 52 opens the thermal valve 43, and when the heating operation switch 166 is turned off, the combustion control means 52 closes the thermal valve 43.

  The combustion control means 52 receives the ON signal of the heating operation switch 161 and controls the combustion of the burner 5 (including the control of the amount of combustion by opening the gas solenoid valve 14 and controlling the opening amount of the gas proportional valve 18) and the combustion. The rotation of the fan 15 is controlled, and the circulation pump 9 for heating is driven. The combustion control means 52 controls the combustion of the burner 5 so as to supply the liquid at 80 ° C. (FB: feedback control so that the temperature detected by the heating high-temperature thermistor 40 becomes 80 ° C.) when the high-temperature heating device 70 is operated. By performing control and rotation control of the combustion fan 18 and the like, the heating heat exchanger (the heating liquid circulation pipe 12 and the heating heat exchanger 6 for latent heat recovery, which form the main heating heat exchanger), is turned on. Heats the liquid circulating in the heating liquid circulation passage 7. The heated liquid is led out from the main heating heat exchanger at about 80 ° C., passes through the pipeline 60 as shown by the arrow C in FIG. 1, and in the closed state of the reheating liquid flow control valve 32, As shown by an arrow D in FIG. 1, the air is supplied to the heating device 70 through pipes 64 and 72 in order.

  The liquid supplied to the heating device 70 radiates heat when passing through a pipeline in the heating device 70, passes through the pipeline 74 in a state where the temperature has decreased to, for example, about 60 ° C., and passes through an arrow D ′ in FIG. As shown in (1), it is introduced into the heating heat exchanger 6 (latent heat exchanger) through the conduit 61 and is heated by the heating heat exchanger 6. This heated liquid is led out through the pipe line 62 as shown by the arrow F in FIG. 1 and introduced into the cistern device 10, and after passing through the cistern device 10, as shown by the arrow G in FIG. It is introduced into the heating circulation pump 9 through the pipe 62. Thereafter, the liquid is introduced into the main heating heat exchanger (sensible heat exchanger) (liquid circulation pipe 12) through the pipe 59 as shown by the arrow A in FIG. It is heated by the heat exchanger and circulates in the heating liquid circulation passage 7 in the same manner as described above.

  In addition, in the state where the reheating liquid flow control valve 32 is open (= when reheating, the reheating becomes high temperature heating), the liquid passing through the pipeline 60 is indicated by the arrow D as described above. Introduced into the pipe 61 after being introduced into the heating device (high-temperature heating device) 70 side, as shown by the arrow E ', the pipe (branch passage) 65, and the liquid-water heat exchange for reheating. Through the vessel 25 and into the flow introduced into the conduit 61.

  Further, when the high-temperature heating device 70 operates, the combustion control means 52 normally supplies a liquid at 60 ° C. to the low-temperature heating device 73 when operating the low-temperature heating device 73. At this time, the combustion control of the burner 5 and the rotation control of the combustion fan 18 are the same as in the operation of the high-temperature heating device 70, and the main heating heat exchanger refers to the temperature of the heating high-temperature thermistor 40. Then, a liquid at an appropriate temperature (for example, about 80 ° C.) is drawn out, but the combustion control means 52 opens the liquid flow control valve 32 for reheating and turns the liquid into the arrows C, E, D in FIG. , F, the pipe 60, the pipe 65 (upstream of the reheating liquid-water heat exchanger 25), the reheating liquid-water heat exchanger 25, and the pipe 65 (reheating) (A downstream side of the liquid-water heat exchanger 25), the pipe 61, the heating heat exchanger 6 for latent heat recovery, the pipe 62, the cistern device 10, and the pipe 62 in order, to the circulation pump 9 for heating. Introduce it.

  During the operation of the high-temperature heating device 70, the liquid discharged from the heating circulation pump 9 radiates heat when passing through the pipeline of the high-temperature heating device 70, so that the temperature drops to, for example, about 60 ° C. In the state, as shown by the arrow in FIG. 1, the liquid is introduced into the low-temperature heating device 71 through the conduit 73, so that the temperature of the liquid is lower than that when the liquid is directly introduced from the main heating heat exchanger. Becomes lower. The liquid radiated through the low-temperature heating device 71 and cooled to a low temperature of, for example, 40 ° C. or less passes through the pipe 74 and is introduced into the pipe 61, and circulates in the heating liquid circulation path 7 in the same manner as described above.

  When the high-temperature heating device 70 is not operating, the temperature of the liquid introduced into the low-temperature heating device 71 is controlled by the combustion control means 52 based on the temperature detected by the heating low-temperature thermistor 41. That is, during normal operation of the low-temperature heating device 71, the temperature is sent to the pipe 73 so that the detected temperature of the heating low-temperature thermistor 41 becomes, for example, 60 ° C. (FB; feedback control). At this time, the low-temperature capacity switching valve (thermal valve) 118 is opened to adjust the combustion amount of the burner 5 and sent to the pipeline 73.

  Immediately after the operation of the low-temperature heating device 71 is started, the liquid in the internal passages and the pipes 73 of the low-temperature heating device 71 is in a cold state. In the dash operation (cold start), the low-temperature capacity switching valve (thermal valve) 118 is opened such that the detected temperature of the heating high-temperature thermistor 33 becomes, for example, 80 ° C. for a predetermined hot dash set time, for example, 30 minutes. Then, the combustion amount of the burner 5 is adjusted (controlled) and sent to the pipeline 61.

  When both the low-temperature heating device 71 and the high-temperature heating device 70 operate, a liquid is drawn out at about 80 ° C. from the main heating heat exchanger, and after the liquid passes through the pipe 60, the liquid is indicated by an arrow D. After being divided into a direction and a direction indicated by an arrow D ', and passing through as indicated by arrows D and D', respectively, it is introduced into a conduit 61. When only the low-temperature heating device 71 is operated, after passing through the pipe 60, it flows in the direction shown by the arrow D ′ and is introduced into the pipe 61.

  The bath set temperature input operation unit 163 shown in FIG. 14 is an operation unit for setting the temperature of the bath water, and the bath water temperature is set to an appropriate value of, for example, about 40 ° C. Information on the set temperature is added to the combustion control means 52. The bath automatic switch 164 is an on / off switch for automatic filling of the bathtub 75, heat retention, and water retention operation. The ON signal of the bath automatic switch 164 is applied to the combustion control means 52 for 4 hours after the automatic filling. It turns off automatically after keeping warm and water. Further, the reheating switch 160 is an ON switch for a separate operation of reheating the bathtub hot water, and an ON signal of the reheating switch 160 is applied to the combustion control means 52. When the reheating operation is completed by the combustion control means 52, the reheating switch 160 is automatically turned off.

  When the ON signal of the bath automatic switch 164 is applied, the combustion control means 52 heats the water passing through the liquid flow pipe 13 of the main hot water supply heat exchanger by, for example, combustion of the burner 2, and Pour hot water into bathtub 75 through 49. At this time, for example, as shown in FIG. 15, relational data (PQ data) between the water level (P) and the water amount (Q) of the bathtub previously given to the memory unit 4 and the water level sensor 30 detect the data. Pour water to the set water level in the bathtub based on the detected water level. When the bathtub hot water temperature detected by the bath thermistor 28 obtained by driving the bathtub hot water circulation pump 27 is lower than the bath set temperature, the reheating liquid flow control valve 32 is opened so as to reach the bath set temperature. Then, the bathtub hot water circulation pump 27 is turned on to perform the reheating operation of the bathtub hot water. In addition, the combustion control means 52 performs the reheating operation of the bathtub hot water so that the bathtub hot water temperature detected by the bath thermistor 28 becomes the bath set temperature even when the ON signal of the reheating switch 160 is applied.

  FIG. 3 is a block diagram showing a characteristic control configuration of the heat source device according to the present embodiment. As shown in FIG. 3, the control device 54 of the heat source device , Combustion control means 52, and pump drive control means 55. The control device 54 includes a remote control device 53, a tap water thermistor 24, a water amount sensor (flow rate sensor) 19, a reheating liquid flow rate control valve 32, gas solenoid valves 14, 17, a gas proportional valve 18, a combustion fan 15, and a heating fan. The circulation pump 9, the heating high-temperature thermistor 40, the heating low-temperature thermistor 41, and the heat exchange side thermistor 23 are signal-connected.

  The branch corresponding hot water supply side temperature variable means 51 controls at least one of the presence and the flow of the liquid branched to the branch passage 65 side by controlling the reheating liquid flow rate control valve 32, whereby the hot water supply heating thermal The temperature of the water flowing through the hot water supply circuit 45 is varied by varying the amount of heat applied from the heating circuit 7 to the hot water supply circuit 45 via the connection liquid-water heat exchanger 33. Note that the branching hot water supply side temperature variable means 51 also performs control to open the reheating liquid flow rate control valve 32 during the reheating of the bath water and close the reheating liquid flow control valve 32 after the reheating.

  When the temperature of the water flowing in the hot water supply circuit 45 is increased, the branching hot water supply side temperature variable means 51 allows the liquid that has passed through the main heating heat exchanger to pass through the branch passage 65 or increases the liquid flow rate. In this way, the control of the reheating liquid flow control valve 32 is performed. On the other hand, when it is not necessary to increase the temperature of the water flowing through the hot water supply circuit 45, the liquid passing through the main heating heat exchanger is not passed through the branch passage 65 or the flow rate of the heat medium is reduced so as to reduce the flow rate of the heat medium. The control of the liquid flow control valve 32 is performed.

  The branching corresponding hot water supply side temperature variable means 51 is based on the detected temperature of the post-heat-exchange water temperature detected by the post-heat-exchange water temperature detecting means 133, the detected flow rate of the water amount sensor 19, and the detected temperature of the supplied water temperature detecting means. And a heat exchange capacity estimating means for estimating the heat exchange capacity of the liquid-water heat exchanger 33 for hot water supply / heating thermal connection (not shown). Then, based on the heat exchange capacity estimated by the heat exchange capacity estimating means, the opening and closing of the liquid flow control valve 32 for reheating and the control of the valve opening amount are performed.

  Specifically, for example, the heat exchange capacity estimating means obtains the detected temperature of the post-heat-exchange water temperature detected by the post-heat-exchange water temperature detecting means 133 based on Tout, the detected flow rate of the water amount sensor 19, and the bypass ratio in the hot water supply circuit 45. When the flow rate of water passing through the hot water supply / heating heat connection liquid-water heat exchanger 33 is Q, and the temperature detected by the water temperature detecting means is Tin, the water temperature is increased by the hot water heat exchanger 4 for latent heat recovery. Based on the temperature ΔT to be heated (for example, a predetermined temperature in the range of 1 to 2 ° C.), the heat exchange capacity of the liquid-water heat exchanger 33 for hot water supply / heating thermal connection is calculated by {Tout− (Tin + ΔT)} Q Based on this value, the branch opening hot water supply temperature variable means 51 controls the opening amount of the reheating liquid flow rate control valve 32.

  Note that, when the heating medium (hot water) of the heating circuit 7 is supplied to the branch passage 65 and reheating of the bath water is performed, the heating circuit 7 is connected via the hot water supply / heating heat connection liquid-water heat exchanger 33. Although the amount of heat given to the hot water supply circuit 45 from the side becomes small, such timing does not occur often, and the heat medium is transferred to the branch passage 65 while the water circulation operation in the reheating circuit 26 is stopped. In this way, the heat of the heat medium of the heating circuit 7 is transmitted to the hot water supply side with almost no transfer of heat from the heat medium of the heating circuit 7 to the reheating circuit 26 to thereby supply the hot water. Can be replenished.

  The combustion control means 52 is based on a signal (command, set temperature value, etc.) from the remote control device 53, and the tapping thermistor 24, the water amount sensor (flow rate sensor) 19, the heat exchange side thermistor 23, the heating high temperature thermistor 40, the heating low temperature thermistor With reference to the detection signals such as 41, the control of opening and closing of the gas solenoid valves 14 and 17 and the control of the opening amount of the gas proportional valve 18 are performed, and the burner device 2 (2a, 2b, 2c) for hot water supply and the heater for heating are provided. This is for controlling the combustion of the burner 5. Further, the combustion control means 52 drives the combustion fan 15 when the burners 2 and 5 are burning, and performs appropriate control by, for example, making the number of revolutions correspond to the amount of combustion of the burners 2 and 5.

  As described above, the heat source device of the present embodiment supplies hot water at a set hot water supply temperature through the hot water supply circuit 45, and supplies the heating medium (hot water) heated through the heating circuit 7 to the heating devices 70 and 71. The combustion control means 52 has a function of performing a heating operation of circulating the heat medium to the heating devices 70 and 71. The combustion control means 52 performs the individual operation (the single operation of hot water supply and the single operation of the heating operation) and the operation of the hot water supply and the heating operation. At the time of the simultaneous operation, combustion control for switching the combustion surface of the hot water supply burner device 2 (2a, 2b, 2c) and the heating burner 5 is performed as follows.

  In other words, during the hot water supply operation alone, the combustion control means 52 performs the one-way pipe installation section 111 when the required hot water supply capacity required for the hot water supply operation operation is less than a predetermined water path installation section switching reference capacity (for example, 16.5). Only the hot water supply burner device 2 (2a, 2b, 2c) on the lower side is burned. , 2c) and the burner device 5 for heating below the dual pipe arrangement portion 112. Further, the combustion control means 52 sequentially adds the value of the required hot water supply capability required for the hot water supply operation to the branching hot water supply side temperature variable means 51.

  The combustion control of the hot water supply burner devices 2 (2a, 2b, 2c) performed by the combustion control means 52 is performed by a plurality of hot water supply burner devices 2a, 2b, 2c as shown in FIG. The combustion surface (segmented combustion surface) divided by the burner 107 is selectively and sequentially additionally burned in a predetermined order every time the combustion capacity required for the hot water supply burner device 2 is increased by one step. .

  For example, in the burner combustion in the hot water supply alone operation, as shown in the orchid of the number of switching stages (1) in Table 1, the combustion surface to be burned first is the combustion surface of the four burners 107 of the burner device 2a for hot water supply. is there. In Table 1, as shown in FIG. 1, the combustion surface of the hot water supply burner device 2a is A, the combustion surface of the hot water supply burner device 2b is B, and the combustion surface of the hot water supply burner device 2c is C. , D represents the combustion surface of the heating burner device 5.

The hot water supply characteristic (hot water supply characteristic) obtained by combustion of only the hot water supply burner device 2a is, for example, when the temperature of incoming water to the hot water supply circuit 45 is 15 ° C., according to the hot water supply set temperature, the characteristic line a _{1 in} FIG. hot water supply in the region sandwiched between the characteristic line a ₂ becomes possible as. That is, even when only the hot water supply burner device 2a is burned, the hot water supply characteristic is different depending on the opening amount of the gas proportional valve 18, and when the opening amount of the gas proportional valve 18 is at the minimum opening degree, FIG. becomes the characteristic of the characteristic line a _1, approach the characteristic line a ₂ side of FIG. 5 as the greater the opening amount of the gas proportional valve 18, the characteristics of the characteristic lines a ₂ when the maximum opening is obtained, combustion control The means 52 controls the valve opening amount of the gas proportional valve 18 in accordance with the hot water supply set temperature and the hot water supply flow rate to proportionally control the supply gas amount.

When the combustion capacity corresponding to the hot water supply request capacity is increased by one step, the combustion control means 52 performs a total of seven burners of three burners 107 of the burner device 2b in addition to the combustion surfaces of the four burners 107 of the burner device 2a. The combustion on the combustion surface 107 is performed (see the single hot water supply combustion and the number of switching stages (2) in Table 1). Burner unit 2a, a hot water supply characteristics obtained by the combustion of 2b, for example, when the incoming water temperature to the hot water supply circuit 45 is 15 ° C., the hot water supply in the region sandwiched between the characteristic line b ₁ and the characteristic line b ₂ in FIG. 5 Becomes possible.

That is, hot water characteristic obtained burner device 2a, by the combustion of 2b, in response to the amount of opening of the gas proportional valve 18, the characteristics of the characteristic line b ₁ of FIG. 5 when the minimum opening is the amount of opening of the gas proportional valve 18 next, close to the characteristic line b ₂ side of FIG. 5 as the greater the opening amount of the gas proportional valve 18, the characteristics of the characteristic line b ₂ when the maximum opening is obtained, combustion control means 52, hot water supply set The amount of supplied gas is proportionally controlled by controlling the opening amount of the gas proportional valve 18 in accordance with the temperature and the flow rate of hot water.

Further, when the combustion capacity corresponding to the hot water supply request capacity further increases by one step, the combustion control means 52 determines that the combustion surfaces of the four burners 107 of the burner device 2a and the three burners 107 of the burner device 2b and 7 of the burner device 2c. The combustion surface of the thirteen burners 107 is burned on the combustion surface (a single hot water supply combustion, the number of switching stages (3) in Table 1). Hot water characteristic obtained by the combustion of these burner unit 2a, 2b, 2c, for example entering water temperature to the hot water supply circuit 45 in the case of 15 ° C., sandwiched between the characteristic lines c ₁ and the characteristic line c ₂ in FIG. 5 Hot water supply in the area becomes possible.

In other words, burner hot water characteristic obtained by the combustion of the device 2a, 2b, 2c, in response to the amount of opening of the gas proportional valve 18, the characteristic line c ₁ of FIG. 5 when the amount of opening of the gas proportional valve 18 is minimum opening becomes characteristic approaches a characteristic line c ₂ side of FIG. 5 as the greater the opening amount of the gas proportional valve 18, the characteristics of the characteristic lines c ₂ at the time of maximum opening is obtained, combustion control means 52, The amount of gas to be supplied is proportionally controlled by controlling the opening amount of the gas proportional valve 18 in accordance with the set temperature of hot water and the flow rate of hot water.

  Further, during the hot water supply alone operation, when the combustion capacity corresponding to the hot water supply request capacity becomes equal to or higher than the water passage arrangement section switching reference capacity (for example, 16.5), the combustion control means 52 supplies the hot water supply burner device 2 (2a). , 2b, 2c), and also burns the burner device 5 for heating below the two-way pipe arrangement portion 112 (see Table 1 for single hot-water supply, number of switching stages (4)). At this time, the combustion control means 52 applies a command to the pump drive control means 55 to drive the circulation pump 9 for heating.

Burner unit 2a for hot water supply, 2b, 2c and hot water characteristic obtained by the combustion of the burner unit 5 for heating, for example, when the incoming water temperature to the hot water supply circuit 45 is 15 ° C., the characteristic line d ₁ and the characteristic of FIG. 5 hot water supply in sandwiched between the line d ₂ region is possible. That is, the hot water supply characteristics obtained by the combustion of the burner devices 2a, 2b, 2c and the burner device 5 for heating depend on the opening amount of the gas proportional valve 18 when the opening amount of the gas proportional valve 18 is the minimum opening degree. becomes the characteristic of the characteristic line d ₁ in FIG. 5, approaches the characteristic curve d ₂ side of FIG. 5 as the greater the opening amount of the gas proportional valve 18, the characteristics of the characteristic line d ₂ when the maximum opening is obtained The combustion control means 52 controls the gas proportional valve 18 in accordance with the hot water supply set temperature and the hot water supply flow rate.

Further, even during the hot water supply alone operation, the liquid circulation pump 9 is driven to circulate the heat medium (warm water) in the heating circuit 7 when the burner device 5 for heating is to be burned, so that the hot water supply and the thermal connection are achieved. liquid - by through the water heat exchanger 33 to recover by the endothermic heat of the heating circuit 7 side to the hot water supply side, high in the region sandwiched between the characteristic curve d ₁ and the characteristic line d ₂ in FIG. 5 hot water Hot water can be supplied by capacity.

That is, in the present embodiment, all the combustion surfaces of the hot water supply burner device 2 and the heating burner device 5 are burned to control the valve opening amount of the gas proportional valve 18, and the heat medium of the heating circuit 7 is controlled. At this time, the branching hot water supply side temperature variable means 51 opens the reheating liquid flow rate control valve 32 and the hot water supply circuit from the heating circuit 7 side via the hot water supply / heating heat connection liquid-water heat exchanger 33. by transferring heat to 45 side, it is possible to perform hot water supply due to the high hot water supply capacity within the region sandwiched between the characteristic curve d ₁ and the characteristic line d ₂ in Fig.

  The combustion control means 52 is disposed below the dual-pipe arrangement section 112 when the required combustion capacity required for the heating operation is less than a predetermined heating control switching reference capacity (for example, 7.3 kW) during the single heating operation. The nine burners 109 of the heating burner device 5 are turned on / off (on / off combustion (intermittent combustion) is repeated, which is turned on and off at every predetermined on / off timing). At this time, the gas proportional valve 18 is opened. Minimize the valve displacement.

  On the other hand, when the required combustion capacity required for the heating operation is equal to or higher than the heating control switching reference capacity, the nine burners 109 of the heating burner device 5 are continuously burned. Correspondingly, the valve opening amount of the gas proportional valve 18 is controlled to proportionally control the supply gas amount.

  In the present embodiment, the combustion control means 52 has a hot water supply / heating simultaneous operation control means (not shown), and at the time of simultaneous operation of hot water supply and heating, control by the hot water supply / heating simultaneous operation control means is performed as follows. . In other words, the hot water supply / room heating simultaneous operation control means performs an operation that gives priority to the temperature control on the hot water supply side, and the heating side performs the temperature adjustment based on the temperature control on the hot water supply side (that is, the temperature adjustment corresponding to the heating side). No action is taken) or wait.

  Specifically, when the required hot water supply capability (required combustion capability required for the hot water supply operation) of the heat source device is equal to or less than a predetermined simultaneous combustion combustion surface switching reference capability (for example, No. 4.6), the heating power Only the combustion control of the hot water supply burner device 2 is performed with the combustion of the burner device 5 stopped, and when the hot water supply request capability is larger than the simultaneous combustion combustion surface switching reference capability (for example, No. 4.6), the heating control is performed. While burning the burner device 5, combustion control of the burner device for hot water supply is performed in accordance with the required hot water supply capability.

That is, in the same manner as in the single hot water supply run as a wait state is not performed combustion burner device 5 for heating in the area indicated on the left side of the characteristic curve a ₁ or on characteristic line a ₁ in Fig. 6, for example for hot water supply performs combustion of the burner apparatus 2a, in the region shown on the right side than the characteristic lines a _1, as described below, the amount of opening of the gas solenoid valve 14, 17 and the gas proportional valve 18 in correspondence with the hot water supply required capacity Perform control. For example, when the required combustion capacity exceeds the switching reference capacity for the first time from a state where the required combustion capacity is smaller than the reference combustion capacity for simultaneous combustion (for example, No. 4.6), first, the nine burner devices 5 for heating are used. The combustion surface of the burner 107 is burned (see Table 1 for simultaneous hot water supply and heating, switching stage number (1)).

In the present embodiment, since the two-way piping arrangement portion 112 is provided above the heating burner device 5, the heating of the hot water supply side is also performed by the combustion of the heating burner device 5 alone, and the gas proportion is increased. also changes the hot water supply side of the capacity according to the amount of opening of the valve 18, for example, when the incoming water temperature to the hot water supply circuit 45 is 15 ° C., the characteristic line a ₁ in Fig. 6 in accordance with hot water set temperature and the characteristic line a ₂ Hot water supply characteristics in the region between the side and the side are obtained. That becomes a characteristic of the characteristic line a ₁ in Fig. 6 when the minimum opening is the amount of opening of the gas proportional valve 18, close to the characteristic line a ₂ side of FIG. 6 as the greater the opening amount of the gas proportional valve 18 the characteristics of the characteristic lines a ₂ when the maximum opening is obtained, water supply and heating simultaneous operation control means of the combustion control means 52 so as to correspond to the hot water set temperature and the hot water flow rate control valve opening degree of the gas proportional valve 18 Then, the supplied gas amount is proportionally controlled.

In addition, the hot water supply / heating simultaneous operation control means of the combustion control means 52 activates the three burners 107 of the burner device 2b in addition to the heating burner device 5 when the combustion performance required according to the required hot water supply capability increases by one step. The combustion is performed on the combustion surfaces of a total of 12 burners 107 and 109 (see Table 1 for simultaneous hot water supply and heating, and the number of switching stages (2)). At this time, depending on the amount of opening of the gas proportional valve 18, for example, when the incoming water temperature to the hot water supply circuit 45 is 15 ℃, depending on the hot water set temperature characteristic line of FIG. 6 b ₁ and the characteristic line b ₂ side And hot water supply characteristics in the region between the two.

That is, when the amount of opening of the gas proportional valve 18 is minimum opening becomes properties characteristic line b ₁ of FIG. 6, close to the characteristic line b ₂ side of FIG. 6 as the greater the opening amount of the gas proportional valve 18, characteristics of the characteristic line b ₂ when the maximum opening is obtained. Therefore, the hot water supply / heating simultaneous operation control means of the combustion control means 52 controls the valve opening amount of the gas proportional valve 18 in accordance with the hot water supply set temperature and the hot water supply flow rate to proportionally control the supply gas amount.

Note that the hot water supply / heating simultaneous operation control means of the combustion control means 52 changes the hot water supply required capacity from a state larger than the simultaneous combustion combustion surface switching reference capacity to a state equal to or less than the switching reference capacity, and thereafter, the hot water required capacity becomes When the state changes from the state below the switching reference capacity to the state larger than the switching reference capacity, the combustion of the heating burner device 5 is not immediately started even if the simultaneous combustion combustion surface switching reference capability is exceeded (the heating burner device). without ignition of the 5), plus includes switching criterion capacity is set to a value greater than the time of combustion surface switching reference capacity co-fire (e.g., wherein is an ability to respond to the characteristic line b ₁ of FIG. 6 When the burner device 5 for heating and the burner device 2b for hot water supply burn at the minimum valve opening of the gas proportional valve 18), the burner device for heating is turned on. The combustion of the burner device 5 for heating and the burner device 2 for hot water supply is controlled by burning.

  The hot water supply / heating simultaneous operation control means of the combustion control means 52 stops the combustion of the heating burner device 5 when the hot water supply required capacity changes from a state larger than the switching reference capacity to a state equal to or less than the switching reference capacity. Only the combustion control of the hot water supply burner device 2 (as a heating standby) is performed.

  As described above, in the present embodiment, when the hot water supply request capability required for the hot water supply operation is larger than a predetermined switching reference capability, the control of the hot water supply request Correspondingly, the combustion control of the heating burner device 5 or the combustion control of the heating burner device 5 and the hot water supply burner device 2 is performed, so that the one-type pipe arrangement part 111 and the two-type pipe The hot water supply flow path 13 provided in both the passage arranging section 112 and the hot water supply pipe 13 can be appropriately heated to supply hot water at a set hot water supply temperature at an appropriate flow rate.

  On the other hand, when the required hot water supply capability required for the hot water supply operation is equal to or less than the switching reference capability, only the combustion control of the hot water supply burner device 2 is performed while the combustion of the heating burner device 5 is stopped. The hot water supply liquid flow path 13 provided in the section 111 and the hot water supply liquid flow path 13 in some of the two-type pipe installation sections 112 adjacent to the one-type pipe installation section 111 It is possible to supply the hot water at the set hot water supply temperature at an appropriate flow rate by appropriately heating and hardly heating the hot water supply liquid circulation pipe 13 provided in the two-type pipe installation section 112. .

  In the present embodiment, when the required hot water supply capability for the hot water supply operation is equal to or less than the switching reference capability, the heating of the heat medium in the heating circuit 7 is performed by stopping the combustion of the heating burner device 5. There is a possibility that the temperature of the heat medium on the heating side may decrease because of the absence of the heat medium. However, on the heating side, the user does not directly touch the heat medium, so it is difficult to sense the decrease in the temperature of the heat medium sensitively. When the required hot water supply capacity for the hot water supply operation is equal to or less than the switching reference capacity, it is highly likely that hot water is supplied at a small flow rate in, for example, a kitchen or a washroom, and this time may not last long. Therefore, it is considered that the simultaneous operation time of heating and hot water supply when the hot water supply request capability is equal to or less than the switching reference capability is short.

  Therefore, for example, if the hot water supply capability is not higher than the switching reference capability during the simultaneous operation (operation) of hot water supply and heating, the hot water supply is stopped and the heating burner device 5 is burned. Therefore, there is a very low possibility that the state in which the combustion of the heating burner device 5 is not performed for a long time even if the user desires the heating operation is very low, and the user can easily use the heating devices 70 and 71 in operation. There is no problem.

  Further, in the present embodiment, during the hot water supply / heating simultaneous operation, after the hot water supply required capacity required for the hot water supply operation changes from a state larger than the switching reference capacity to the switching reference capacity or less, the state is changed from the state below the switching reference capacity to the switching reference capacity. When the state changes to a state exceeding the capacity, when the additional reference switching capacity set to a value larger than the switching reference capacity is reached, the heating burner device 5 is burned to activate the hot water supply burner device 2. Combustion control is also performed, and when the required hot water supply capability required for the hot water supply operation changes from a value greater than the switching reference capability to less than or equal to the switching reference capability, the combustion of the heating burner device 5 is stopped and the hot water supply burner is stopped. By performing only the combustion control of the device 2, the following effects can be obtained.

  In this embodiment, the switching means for switching the supply of the heat medium from the heating circuit 7 to the heating devices 70 and 71 is formed by the heat operated valves 48 and 76 which open and close in accordance with the temperature of the heat medium. The opening / closing control of the valve is not performed quickly but is performed slowly as in the case of the electromagnetic valve, and the heat operated valves 48 and 76 respond to the switching signal indicating whether or not the heating medium is supplied from the heating circuit 7 to the heating devices 70 and 71. The opening / closing operation does not follow quickly.

  On the other hand, as described above, the switching reference capability for setting the reference for stopping the burner device 5 for heating at the time of simultaneous operation of hot water supply and heating and the additional switching for setting the reference for restarting the combustion of the burner device 5 for heating are used. Two different values of the reference capacity are given, and the additional stress is set to a value higher than the reference capacity, and the simultaneous heating / heating operation is performed according to these reference capacity and the hot water supply demand capacity. By stopping the burner device 5 and restarting the combustion (reignition), control adapted to the opening and closing operations of the thermal valves 48 and 76 is performed, and the stop of the heating burner device 5 and the restart of the combustion (on / off) are frequently performed. Can be prevented, and the life of the heating burner device 5 can be extended.

  Further, the hot water supply / heating simultaneous operation control means of the combustion control means 52, when the required hot water supply capacity is further increased, a total of 22 burners 107 of the heating burner device 5 and all the hot water supply burner devices 2a, 2b, 2c. (See Table 1 for simultaneous hot water supply and heating, number of switching stages (3)).

At this time, according to the valve opening amount of the gas proportional valve 18, for example, when the water input temperature to the hot water supply circuit 45 is 15 ° C., the characteristic line d ₁ and the characteristic line d _{2 in} FIG. The hot water supply characteristics in the region between are obtained. That is, when the amount of opening of the gas proportional valve 18 is minimum opening becomes properties characteristic line d ₁ in FIG. 6, close to the characteristic curve d ₂ side of FIG. 6 as the greater the opening amount of the gas proportional valve 18, characteristics characteristic line d ₂ when the maximum opening is obtained. Therefore, the combustion control means 52 controls the valve opening amount of the gas proportional valve 18 in accordance with the hot water supply set temperature and the hot water supply flow rate to proportionally control the supply gas amount.

  In addition, the characteristic line c in FIG. 6 shows that a total of 22 burners 107 and 109 of the heating burner device 5 and all the hot water supply burner devices 2a, 2b and 2c were maximally burned (the gas proportional valve 18). In the case where combustion is performed with the opening degree maximized), the heating heat burner device 5 absorbs all the heat from the heating liquid circulation pipe 12 and the heat absorption by the hot water supply liquid circulation pipe 13 is reduced. The hot water supply characteristics in the case where it cannot be performed are shown.

As can be seen by comparing the characteristic line d ₂ and the characteristic line c in FIG. 6, the burner device 2a for all of the water heater burner device 5 for heating, 2b, a total of 22 burners 107 2c by largest combustion these burner unit 5,2A, 2b, if the liquid distribution line 13 all endotherm hot water supply the heat of combustion of 2c, the ability of No.24 water heater to obtain characteristics of the characteristic line d ₂ in FIG. 6 However, when all of the combustion heat of the heating burner device 5 is absorbed by the heating liquid circulation pipe 12, the characteristic of the characteristic line c in FIG. 6 is obtained and the hot water supply capacity is 16.5. Hot water supply capacity.

  For this reason, for example, in a region within a broken-line frame E in FIG. 6, the amount of heat absorbed by the heating liquid circulation pipe 12 during the simultaneous combustion of hot water supply and heating by the heating burner device 5. Depending on the hot water supply capacity, the hot water supply capacity may be reduced. However, in this embodiment, a hot water supply / heating heat connection liquid-water heat exchanger 33 is provided, and a heat medium (hot water) in the heating circuit 7 is supplied to the hot water supply circuit 45 in the hot water supply circuit 45. By performing the heat transfer to the heat medium (water), such a decrease in the hot water supply capacity can be supplemented.

  By the way, in an apparatus in which one combustion fan 15 is provided to perform hot water supply and heating operation as in the present embodiment, the combustion fan 15 may be operated in hot water supply only operation or heating only operation. Drive. Therefore, the burner device 2 for hot water supply and the burner device 5 for heating are arranged side by side, and a hot water supply heat exchanger is provided above the burner device 2 for hot water supply, and the burner device 5 for heating is provided above the burner device 5 for heating. As a configuration in which the heat exchanger is provided, when the heating operation is performed while the hot water supply operation is performed intermittently, the hot water staying in the hot water supply heat exchanger during the hot water supply operation stop period is cooled by the blowing from the combustion fan 15. This causes a cold water sandwich phenomenon in which the hot water supply temperature fluctuates.

  On the other hand, in the present embodiment, a type pipe arrangement portion 111 in which the hot water supply liquid circulation pipe 13 is arranged is provided above the hot water supply burner device 2 and is provided in parallel with the hot water supply burner device 2. On the upper side of the burner device 5 for heating, a two-type pipe arranging portion 112 arranged so as to contact the liquid circulating line 13 for hot water supply vertically by the liquid circulating line 12 for heating. , The following effects can be obtained.

  In other words, when the heating alone operation is performed and the combustion fan 15 is driven together with the combustion of the heating burner device 5, the hot water staying in the liquid circulation pipe 13 of the kind pipe installation section 111 stops hot water supply. Even if it is cooled by the wind from the combustion fan 15 thereafter, the hot water staying in the liquid circulation pipe 13 of the two-type pipe installation part is heated by the combustion of the heating burner device 5, The hot water remains in the hot water supply liquid flow path 13 that forms the hot water supply heat exchanger, and the heat medium (hot water) supplied through the hot water supply circuit 45 is supplied to the type pipe installation section 111 and the heating medium. Water is supplied through the two-pipe conduit arrangement portion 112 heated by the burner device 5 for use, so that the cold water sandwich phenomenon can be suppressed.

  In the present embodiment, as shown in the fourth from the right in FIG. 2, the liquid circulation pipe 13 of the dual pipe arrangement part 112 which protrudes toward the hot water supply burner device 2 is heated. During combustion of the burner device 5 for combustion, the combustion gas is heated by the combustion gas that rises while spreading from the combustion surface of the burner device 5 toward the burner device 2 for hot water supply. Since almost all of the heat is absorbed by the liquid flow pipe 12 provided in contact with the liquid flow pipe 13, the amount of heat of the combustion gas absorbed by the liquid flow pipe 13 is not so large.

  Therefore, even if the liquid flow pipe 13 in this portion is heated by the spread of the combustion gas from the burner device 5 for heating, the cold water sandwich phenomenon of the supplied hot water cannot be suppressed by itself, but in this embodiment, The liquid circulation pipes 13 (the first, second, and third liquid circulation pipes 13 from the right side in FIG. 2) disposed above the heating burner device 5 burn the combustion burner device 5. The heat quantity of the gas can be sufficiently absorbed, and hot water remains in these liquid circulation pipes 13, so that the cold water sandwich phenomenon can be suppressed as described above.

  That is, the configuration of the present embodiment can suppress the boiling of the liquid (water) in the liquid supply pipe 13 on the hot water supply side during the heating alone operation, and can efficiently operate the hot water supply operation. It is also possible to suppress the cold water sandwich phenomenon, which is a concern when performing the heating operation while performing the heating operation.

  As in the case of the heat source device shown in FIG. 11, a burner device 2 for hot water supply and a burner device 102 for reheating the bath are arranged side by side, and a liquid flow pipe for hot water supply is provided above the burner device 2 for hot water supply. In the case of a configuration in which a passage 13 is provided to provide a liquid circulation pipe 105 for additional heating above the burner device 102 for additional heating, and a combustion fan is provided on each of the hot water supply side and the additional heating side, both of them are used. The combustion fan is driven both in the hot water supply alone operation and in the reheating only operation. However, in this case, the driving of the combustion fan on the non-combustion side is for preventing the backflow of the combustion gas, so that the amount of air blow is small.

  In other words, the blowing for preventing the backflow of the combustion gas does not cause the temperature of the hot water in the heat exchanger on the non-combustion side to drop significantly, and the two combustion fans as shown in FIG. In the configuration in which the heat exchanger 15 is provided, there is little concern about the occurrence of the cold water sandwich phenomenon. The problem that boiling etc. will arise will arise.

  On the other hand, the heat source device of the present embodiment can prevent such a problem of the boiling of the heat medium such as water, and can also suppress the cold water sandwich phenomenon as described above. This is an excellent heat source device that can stabilize the hot water supply temperature even during the simultaneous operation of heating and that can be reduced in cost because of its simple configuration.

  FIG. 7 shows, as a modified example of the present embodiment, the thermal connection configuration of the outlet-side passage of the latent heat recovery hot water supply heat exchanger 4 to the hot water supply heating / thermal connection liquid-water heat exchanger 33. An example in which the configuration is different from that in FIG. 1 is shown. In the example shown in FIG. 7, the liquid-water heat exchanger 33 for hot water supply / heating thermal connection exits from the heating liquid circulation pipe 12 of the composite heat exchanger 1 by the driving of the heating circulation pump 9. A hot heat medium (here, water) is introduced and circulates as shown by the arrow B in FIG. 7, and during the hot water supply operation, from the hot water supply heat exchanger 4 for latent heat recovery, the direction opposite to the arrow B (arrow B ′). ) Is introduced into the hot water supply / heating heat connection liquid-water heat exchanger 33 so as to flow therethrough.

  That is, the heat medium introduced into the hot water supply / heating thermal connection liquid-water heat exchanger 33 from the side of the heating liquid flow pipe 12 is supplied from the water supply side outlet of the hot water supply / heating heat connection liquid-water heat exchanger 33. The water that flows into the hot water supply / heat exchange liquid-water heat exchanger 33 from the hot water supply heat exchanger 4 for latent heat recovery is supplied to the heat medium outlet of the hot water supply / heating heat connection liquid-water heat exchanger 33 ( The water-heat exchanger 33 for hot-water supply / heating thermal connection is formed by an opposed heat exchanger in which the water and the heat medium from the liquid flow pipe 12 flow in opposite directions. ing. For example, the hot heat medium (hot water in this case) heated from the heating liquid circulation pipe 12 is introduced into the hot water supply / heating heat connection liquid-water heat exchanger 33 while the latent heat recovery hot water supply heat exchanger 4 is used. When warm water or water is introduced into the hot water supply / room heating thermal connection liquid-water heat exchanger 33, heat on the heating circuit side can be moved to the hot water supply circuit side (the hot water supply side absorbs heat on the heating side).

  FIG. 8 shows a system configuration of a second embodiment of the heat source device according to the present invention. Hereinafter, the second embodiment will be described. In the description of the second embodiment, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted or simplified.

  In the second embodiment, as shown in FIG. 8, the hot water supply heating and heating provided on the inlet side of the liquid circulation pipe 13 (main hot water supply heat exchanger) of the composite heat exchanger 1 in the first embodiment. The connecting liquid-water heat exchanger 33 is provided on the outlet side of the hot water supply liquid flow path 13 (main hot water supply heat exchanger) that forms the composite heat exchanger 1.

  Further, in the second embodiment, as in the modification of the first embodiment, the liquid-water heat exchanger 33 for hot water supply and heating thermal connection is formed by the opposed heat exchanger. That is, in the second embodiment, the hot water supply / room heating thermal connection liquid-water heat exchanger 33 is introduced into the hot water supply / room heating thermal connection liquid-water heat exchanger 33 from the side of the heating liquid circulation pipe 12. The heat medium flows in from the water supply side outlet of the hot water supply / room heating thermal connection liquid-water heat exchanger 33 and is introduced into the hot water supply / room heating thermal connection liquid-water heat exchanger 33 from the latent heat recovery hot water supply heat exchanger 4. Water flows in from the heat medium outlet (water outlet) of the hot water supply / heating liquid connection-water heat exchanger 33, and the water and the heat medium from the liquid flow pipe 12 flow in opposite directions. It is a counter heat exchanger.

  Except for these differences, the configuration of the second embodiment is the same as that of the first embodiment, and the second embodiment can also provide substantially the same effects as those of the first embodiment and its modifications.

  It should be noted that the present invention is not limited to the above-described embodiments, and various embodiments can be adopted without departing from the technical scope of the present invention. For example, in each of the embodiments described above, the control configuration as shown in FIG. 3 is provided, but the control configuration in the heat source device of the present invention is not particularly limited, and may be set as appropriate.

  Further, the heat source device of the present invention does not necessarily have the composite heat exchanger 1 as shown in FIG. 2, but has, for example, an embodiment having only the two-type pipe arranging portion 112 as shown in FIG. 9. It can also be. As described above, in the heat source device of the present invention, the liquid flow conduit of the main hot water supply heat exchanger is the main fluid supply conduit, as in the two-type conduit arrangement portion 112 of the composite heat exchanger 1 applied to each of the above embodiments. It has at least a part of a two-type pipe arranging portion 112 disposed in contact with each other so as to be vertically sandwiched by the liquid flow channels of the heating heat exchanger. It suffices that the kind of the liquid circulation pipes 12 and 13 has a configuration in which the common liquid burners are heated.

  In the case of the configuration shown in FIG. 9, the burner device can be formed by providing one burner device having a plurality of switchable combustion surfaces, for example. 1 schematically illustrates a state in which one is burning. Further, in the system configuration having a heat exchanger having a configuration as shown in FIG. 9, for example, the heating liquid distribution line 12 of the composite heat exchanger 1 in FIGS. 13 is provided over the entire arrangement position.

  Further, the heat source device of the present invention is formed, for example, as shown in FIGS. 1 and 8, and includes a liquid-water heat exchanger 33 for hot water supply and heating thermal connection, and a hot water supply circuit 45. As long as the heating circuit 7 is thermally connected, the details of the system configuration are not particularly limited and may be set as appropriate. The same effect as in the above-described embodiment can be obtained by performing the switching of the circulation path as in the above-described embodiments. For example, in each of the embodiments described above, the system for calculating the incoming water temperature by calculation without applying the incoming water temperature detecting means for detecting the incoming water temperature of hot water supply is applied, but the incoming water temperature detecting means for detecting the incoming water temperature in real time is provided. Is also good.

  Further, the branching hot water supply side temperature varying means 51 preferably performs both the opening and closing control and the valve opening amount control of the reheating liquid flow control valve, but may perform only the opening and closing control.

  Further, it may have other functions such as a heat collecting function for collecting solar heat, and a configuration such as a hot water storage tank.

  Further, the post-heat-exchange water temperature detecting means 133 can be omitted. However, if the water temperature detection means 133 is provided after the heat exchange, the capacity of the hot water supply / heating connection liquid = water heat exchanger 33 can be accurately grasped, and the state of heat transfer from the heating circuit 7 to the hot water supply circuit 45 can be easily grasped. Therefore, it is preferable.

  Further, in the heat source device of the present invention, for example, a burner device for oil combustion may be provided instead of the burner device for performing gas combustion provided in each of the above embodiments.

  INDUSTRIAL APPLICABILITY The present invention can sufficiently obtain hot water supply and heating capabilities even with a small size, and can also suppress boiling of a heat medium in a heat exchanger during single operation of hot water supply and heating. Available.

REFERENCE SIGNS LIST 1 Heat source device 2 Burner device for hot water supply 4 Hot water supply heat exchanger for latent heat recovery 5 Burner device for heating 6 Heat exchanger for heating for latent heat recovery 7 Heating circuit 8 Heating liquid circulation passage 9 Heating circulation pump 10 Systan 12, 13 Liquid circulation pipe 14, 17 Gas solenoid valve 15 Combustion fan 18 Gas proportional valve 19 Water volume sensor 20 Water volume servo 24 Hot water supply thermistor 23 Heat exchange side thermistor 25 Bath heat exchanger 32 Liquid circulation control valve for reheating 33 Hot water supply Liquid-water heat exchanger for heating connection 40 Heating high temperature thermistor 41 Heating low temperature thermistor 51 Branching hot water supply side temperature variable means 52 Combustion control means 53 Remote control device 56 Branching hot water supply side temperature variable means 54 Control means 55 Pump drive control means 111 Type Pipe laying section 112 Two-way pipe laying section 133 Water temperature detecting means after heat exchange

Claims (6)

  A hot-water supply heat exchanger, a hot-water supply circuit having a function of heating water as a liquid heat medium by the hot-water supply heat exchanger, and supplying hot water to a hot-water supply destination; a heating heat exchanger; A heating circuit having a heating circulation pump for circulating the heating medium, and supplying the heating medium from the heating circuit to a heating device connected to the outside, and circulating the heating medium through the heating circuit. Wherein the hot water supply heat exchanger has a main hot water supply heat exchanger for recovering the sensible heat of the combustion gas of the burner device by a liquid circulation pipe forming the hot water supply heat exchanger; The heat exchanger has a main heating heat exchanger for recovering the sensible heat of the combustion gas of the burner device by a liquid circulation pipe forming the heating heat exchanger, and a liquid circulation pipe of the main hot water supply heat exchanger. Is the liquid flow conduit of the main heating heat exchanger Therefore, at least a part of the two types of pipes provided in contact with each other in a vertically sandwiched manner is provided, and the two types of liquid flow channels of the two types of channels are provided by a common burner device. A composite heat exchanger having a configuration to be heated, wherein a liquid passing through the main heating heat exchanger flows to an outlet side of the main heating heat exchanger toward the heating device. A return-side passage is formed to return the liquid passing through the heating device to the main heating heat exchanger side, and a leading end of a branch passage branched from the outgoing passage is formed in the return passage. And a hot water supply heating connection for thermally connecting the branch passage to one of an inlet side passage and an outlet side passage of the main hot water supply heat exchanger. A heat source device comprising a liquid-water heat exchanger for use.   2. A liquid branch changing means for changing at least one of a presence / absence of a branch of the liquid passing through the main heating heat exchanger to the branch passage and a flow rate of the branch. Heat source equipment.   The hot water supply circuit has a latent heat recovery heat exchanger for recovering latent heat of the combustion gas, and the latent heat recovery heat exchanger is connected to an inlet of the main hot water supply heat exchanger via a pipeline. A liquid-water heat exchanger for the hot water supply and heating thermal connection, a pipeline between the hot water supply heat exchanger for latent heat recovery and the main hot water supply heat exchanger, and the main hot water supply heat exchanger. The heat source device according to claim 1, wherein the heat source device is thermally connected to one of the outlet passages.   A reheating circulating passage connected to the bathtub for reheating the tub hot water is provided, and a reheating liquid-water heat exchanger for thermally connecting the reheating circulating passage and the branch passage is provided. The heat source device according to claim 1, wherein the heat source device is provided.   The liquid-water heat exchanger for reheating is provided upstream of the liquid flow in the branch passage with respect to the liquid-water heat exchanger for hot water supply / heating thermal connection. Heat source equipment.   6. The water supply circuit according to claim 1, further comprising a water amount servo for variably adjusting a total water amount of hot water supplied through the hot water supply circuit. Heat source equipment.

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