JP4624091B2 - Water heater - Google Patents

Description

The present invention relates to a hot water supply apparatus having a hot water supply circuit, a hot water supply circulation circuit, a heating circuit, and a bath circuit .

Conventionally, as this type of combustion apparatus, as disclosed in Patent Document 1, a hot water supply heat exchanger that heats water supplied through a water supply path by combustion of a burner to supply hot water to the hot water supply path, and heating supplied through an inlet path A hot water supply apparatus provided with a fluid heat exchanger that heats a target fluid by combustion of the burner and flows out to an outlet, and the hot water heat exchanger recovers sensible heat of combustion exhaust gas of the burner A sensible heat exchange unit for hot water supply, and a latent heat heat exchange unit for hot water supply that is disposed downstream of the sensible heat exchange unit for hot water supply in the flow direction of the combustion exhaust gas of the burner and recovers the latent heat of the combustion exhaust gas of the burner The fluid heat exchanger recovers sensible heat of the combustion exhaust gas of the burner, and the combustion exhaust gas of the burner than the fluid sensible heat exchange unit. Arranged downstream of the flow direction of And a fluid latent heat exchange part for recovering the latent heat of the combustion exhaust gas of the burner, and the sensible heat exchange part for hot water supply and the sensible heat exchange part for fluid are integrated in a state of conducting heat to each other. And a hot water supply device in which the latent heat heat exchange part for hot water supply and the latent heat heat exchange part for fluid are integrally formed in a state of conducting heat to each other are disclosed (for example, see Patent Document 1). .
JP 2002-267262 A

However, the conventional hot water supply apparatus has a problem that power consumption is large .

The present invention solves the above-described conventional problems, and an object thereof is to provide a hot water supply apparatus that reduces power consumption .

In order to solve the above-described conventional problems, a hot water supply apparatus according to the present invention includes a hot water supply circuit that heats water supplied from a water supply path using a heat exchanger for hot water supply and supplies hot water to a hot water supply path, and branches from the hot water supply path. A hot water supply circulation circuit that reaches the use-side heat exchanger via the hot water supply circulation pump and then reaches the hot-water supply heat exchanger, and the heating heat exchanger as the use-side heat exchanger and the heating device A heating circuit that circulates through the circulation pump for heating, a bath circuit that circulates between the heat exchanger for bath as the use side heat exchanger and the bathtub via the circulation pump for bath, a control device, The control device stops the hot water supply circulation pump when the flow rate of the hot water supply is a certain amount or more during heating or bathing.

As a result , sufficient hot water is supplied to the heat exchanger for heating and the heat exchanger for bath without turning the hot water supply circulation pump, so power consumption can be reduced, and the running cost can be reduced with high efficiency. A hot water supply apparatus can be provided.

The hot water supply apparatus of the present invention can reduce power consumption because sufficient hot water is supplied to the heating heat exchanger and the bath heat exchanger without turning the hot water supply circulation pump .

In addition, it is possible to provide a hot water supply apparatus that is highly efficient and reduces running costs.

1st invention heats the water supplied from a water supply path with a heat exchanger for hot water supply, and supplies hot water to the hot water supply path, and the use side heat is branched from the hot water supply path and passed through the hot water supply circulation pump. Heating that circulates between the hot water supply circulation circuit that reaches the heat exchanger for hot water supply and the heating heat exchanger as the use side heat exchanger and the heating device via a heating circulation pump after being supplied to the exchanger A hot water supply apparatus comprising: a circuit; a bath circuit that circulates between a bath heat exchanger as the use-side heat exchanger and a bathtub via a bath circulation pump; and a control device, the control device Is characterized in that the hot water supply circulation pump is stopped when the flow rate of hot water is higher than a certain amount during heating or bathing, and the flow rate of hot water is constant (for example, 10 L / min). Degree) or more, the hot water supply circulation pump Since hot water sufficient to heat exchangers and heat exchanger for bath for heating without revolving the supplied, it is possible to reduce power consumption.

Hereinafter, reference embodiments and embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

( Reference form 1)
FIG. 1 is a structural diagram of a hot water supply apparatus according to a first reference embodiment of the present invention.
In FIG. 1, first, water supplied from a water supply path 1 is heated by combustion of a burner 2 to rise to a predetermined temperature, then supplied to a hot water supply path 3, and the water supply path 1 and the hot water supply path 3 are formed in communication with each other. A part of water supplied from the water supply channel 1 from the bypass passage 4 is supplied through the bypass control valve 5 to adjust to a desired hot water, and a hot water supply circuit for discharging hot water from the hot water tap 6 is configured.

  Here, the burner 2 is supplied with fuel from a gas supply passage 10 provided with a gas source solenoid valve 7, a gas proportional valve 8, and a gas switching valve 9, and supplied with combustion air from a combustion fan 11, in advance. A combustion operation is performed according to a predetermined sequence. Then, the combustion gas generated by the combustion of the burner 2 passes through the combustion chamber 12, passes through the exhaust passage 13, and is discharged out of the instrument from the exhaust port 14.

  A hot water supply heat exchanger 15 that recovers sensible heat of the combustion gas and a latent heat recovery heat exchanger 16 that recovers the latent heat of the combustion exhaust gas are disposed in the exhaust path of the combustion gas. Specifically, a hot water supply heat exchanger 15 is provided in the downstream combustion chamber 12 of the burner 2, a latent heat recovery heat exchanger 16 is provided in the downstream exhaust passage 13, and water supplied from the water supply passage 1 is supplied. First, the heat is supplied to the latent heat recovery heat exchanger 16 to recover the latent heat in the combustion exhaust gas, and then supplied to the hot water supply heat exchanger 15 to be heated to a predetermined high temperature water by combustion of the burner 2 and supplied to the hot water outlet 3. . Thus, in addition to heat recovery by the conventional hot water supply heat exchanger 15, by providing the latent heat recovery heat exchanger 16 for recovering the latent heat of the combustion exhaust gas, the overall thermal efficiency is improved and energy saving is achieved.

Next, the hot water branched from the hot water supply passage 3 and heated by the latent heat recovery heat exchanger 16 and the hot water supply heat exchanger 15 to the heating heat exchanger 18 which is the use side heat exchanger via the circulation pump 17. Is then returned to the upstream water supply channel 1 of the latent heat recovery heat exchanger 16, passed from the latent heat recovery heat exchanger 16 through the hot water supply heat exchanger 15, and via the circulation pump 17, the heating heat exchanger 18. The hot water supply circulation circuit 19 leading to is constructed. Since this hot water supply circulation circuit 19 is branched from the hot water supply passage 3 near the outlet of the hot water supply heat exchanger 15, the hot water supplied by the burner 2 is used to supply heat to the use side load. it is possible, is optimal when used in such heating circuit described in this reference form.

  The heating circuit 20 is connected to a load such as a radiator 21 on the secondary side of the heating heat exchanger 18 to form a closed circuit, and is circulated by the heating circulation pump 22, whereby the heating heat exchanger 18. Thus, heat is exchanged with the high-temperature water supplied from the hot water supply circuit 19 so as to ensure the amount of heating heat.

  About the combustion apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, at the time of hot water supply operation, when the hot water tap 6 is opened, the water supply side flow rate sensor 23 disposed in the water supply passage 1 detects water flow, and the combustion fan 11 is operated by this water flow signal at the same time, The gas proportional valve 8 is opened, fuel and combustion air are supplied to the burner 2, and combustion is started by an ignition operation. Combustion gas generated by the start of combustion of the burner 2 is discharged from the exhaust port 14 via the exhaust passage 13 from the combustion chamber 12. In the process of exhausting the combustion gas, the water supplied from the water supply passage 1 is heated by the hot water supply heat exchanger 15 disposed in the combustion chamber 12 and the latent heat recovery heat exchanger 16 disposed in the exhaust passage 13. .

  Hot water heated by the hot water supply heat exchanger 15 passes through a bypass passage 4 provided in communication between the water supply passage 1 and the hot water supply passage 3 so as to bypass the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger 16. The bypass control valve 5 is mixed with the water on the incoming side. The opening of the bypass control valve 5 is adjusted by a signal from the hot water thermistor 25 so that the mixed hot water reaches a hot water supply set temperature set by the remote control remote controller 24, and hot water is supplied from the hot water tap 6 through the hot water connection port 26. .

  Thus, when selecting the hot water supply independent operation, the hot water set automatically can be secured by setting a desired temperature with the remote control remote controller 24 and opening the hot water tap 6.

  Next, at the time of heating operation, the heating circulation pump 22 provided in the heating circuit 20 is driven by an operation command of a controller (not shown) built in the heating terminal device such as the radiator 21, and the operation command is linked. Then, the circulation pump 17 for circulating the hot water in the hot water supply circulation circuit 19 is driven, and at the same time, combustion is started by the ignition operation of the burner 2. Combustion gas generated by the start of combustion of the burner 2 is discharged from the exhaust port 14 via the exhaust passage 13 from the combustion chamber 12. In the process of exhausting the combustion gas, the water supplied from the water supply passage 1 is heated by the hot water supply heat exchanger 15 disposed in the combustion chamber 12 and the latent heat recovery heat exchanger 16 disposed in the exhaust passage 13. .

  Hot water heated by the hot water supply heat exchanger 15 is supplied to the heating heat exchanger 18 by the circulation pump 17, and heat is exchanged by the water-water heat exchange configuration and is transferred to the heating circuit 20. Heat of the heating circuit 20 received by the heating heat exchanger 18 is radiated as warm air by the radiator 21. And the high temperature water heat-exchanged with the heat exchanger 18 for heating returns to the upstream water supply path 1 of the heat exchanger 16 for latent heat collection | recovery, forms the hot-water supply circulation circuit 19, and issues the heating operation command from the radiator 21 While it is being circulated, it is maintained at a predetermined hot water temperature to continue circulation.

  In this way, the hot water supplied to the heating heat exchanger 18 is branched from the hot water supply path 3 constituting the hot water supply circuit to form a hot water supply circulation circuit 19, thereby securing high-temperature water necessary for the heating operation, Hot water supply priority operation that can adjust and supply hot water in a wide range from high temperature water to low temperature water to the hot water supply circuit can be ensured.

  Here, the latent heat recovery heat exchanger 16 that recovers the latent heat of the combustion exhaust gas is located downstream of the hot water supply heat exchanger 15 with respect to the exhaust gas path, and is upstream of the hot water supply heat exchanger 15 with respect to the water supply path. The hot water heated by the latent heat recovery heat exchanger 16 is heated by the hot water supply heat exchanger 15. As a result, the amount of heat generated by the combustion of the burner 2 can be efficiently exchanged, leading to energy saving.

Further, as shown in FIG. 2, the latent heat recovery heat exchanger 16 has a side plate 16a, 16b made of stainless steel, a plate fin 16c made of stainless steel arranged between the side plates 16a, 16b, A stainless steel sheath pipe 16d provided in parallel through the openings provided in the side plates 16a and 16b and the plate fin 16c, and a water inlet 16e that is passed through the sheath pipe 16d.
And a plurality of copper water pipes 16g provided with water outlets 16f, a water inlet header 16h that collects the water inlets 16e of the water pipes 16g to form one water inlet path, and a water outlet 16f of the water pipes 16g. And a water discharge header 16i that forms one water intake path, the water flow pipe 16g has a double pipe structure in the exhaust gas path, and a parallel heat exchange path is formed via the water intake header 16h and the water discharge header 16i. I am doing so.

  With this configuration, the water supplied from the water supply channel 1 flows in parallel through the plurality of water pipes 16g from the water inlet header 16h, gathers at the water outlet header 16i, and is supplied to the hot water supply heat exchanger 15. Further, since the inside of the exhaust gas path covers the water pipe 16g with a stainless steel sheath pipe 16d, the problem of corrosion due to condensed water is also suppressed, and the heat efficiency can be improved by recovering the latent heat in the combustion exhaust gas. it can.

  Further, by collecting the water inlet 16e and the water outlet 16f of the water pipe 16g with the water inlet header 16h and the water outlet header 16i, the latent heat recovery heat exchanger 16 can be passed through a plurality of water passages, The passage resistance of the hot water supply circulation circuit 19 can be reduced, and the circulation pump 17 can be reduced in size and weight. Furthermore, the arrangement of the water pipe 16g is simplified by simplifying the arrangement structure of the water pipe 16g by gathering on one side of the water pipe 16g to form the water inlet path and the water outlet path.

In the embodiment of the present reference As described above, in the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger 16 to form a single heating path is the utilization side load circuit by utilizing the circulating water of the heating path Since the heat amount is supplied to the heating circuit 20, it is possible to configure the heating heat exchanger 18 that is a use side heat exchanger not related to the hot water supply heat exchanger 15 and the latent heat recovery heat exchanger 16. The simplification of the main body configuration including the piping configuration can reduce the size and weight of the appliance, and can provide an easy-to-use hot water supply device that prioritizes the hot water supply performance by mainly using the hot water supply circuit as the heating path. Moreover, by adopting a single heating path configuration mainly composed of a hot water supply circuit, the problem of residual water boiling in the heat exchanger during single operation can be solved, and the corrosion resistance of the latent heat recovery heat exchanger 16 can be improved. Easy to configure And, it is possible to provide a water heater which thereby reducing the running cost with high efficiency.

( Reference form 2)
Figure 3 shows a structural diagram of a water heater in the second reference embodiment of the present invention.

Embodiments of the present reference, as a usage-side heat exchanger of the water heater in the first reference embodiment relates to a hot water supply apparatus using a heat exchanger for bath supplying heat to the bath circuit which performs bath reheating . In addition, the thing of the same code | symbol as the 1st reference form has the same structure, and abbreviate | omits description.

  The bath heat exchanger 27 is connected to the hot water supply circulation circuit 19, and heat exchange is performed while circulating the high-temperature water heated by the latent heat recovery heat exchanger 16 and the hot water supply heat exchanger 15 through the circulation pump 17 to the bath circuit 28. Supply heat. The bath circuit 28 replenishes the bath water by supplying the hot water in the bath 31 to the bath heat exchanger 27 through the bath circulation pump 29 and the water amount detection unit 30 and circulating it for a predetermined time. In addition, as a pouring circuit 32 for filling the bathtub 31 with hot water, a path communicating from the outlet hot water path 3 on the downstream side of the bypass passage 4 to the bath circuit 28 is formed.

  Next, the operation and action will be described. When bath operation is instructed by the remote control remote controller 24 during bath operation, the bath circulation pump 29 provided in the bath circuit 28 is driven and the water flow detection unit 30 performs bath water. When the circulation is detected, the circulation pump 17 that circulates the hot water in the hot water supply circulation circuit 19 is driven by the detection signal, and at the same time, combustion is started by the ignition operation of the burner 2.

  Combustion gas generated by the start of combustion of the burner 2 is discharged from the exhaust port 14 via the exhaust passage 13 from the combustion chamber 12. In the process of exhausting the combustion gas, the water supplied from the water supply passage 1 is heated by the hot water supply heat exchanger 15 disposed in the combustion chamber 12 and the latent heat recovery heat exchanger 16 disposed in the exhaust passage 13. .

  Hot water heated by the hot water supply heat exchanger 15 is supplied to the bath heat exchanger 27 by the circulation pump 17, and is heat-exchanged by the water-water heat exchange configuration and transferred to the bath circuit 28. The heat of the bath circuit 28 received by the bath heat exchanger 27 raises the hot water temperature of the bathtub 31 to ensure a predetermined hot water temperature. Then, the high-temperature water heat-exchanged by the bath heat exchanger 27 is returned to the upstream water supply channel 1 of the latent heat recovery heat exchanger 16 to form a hot water supply circulation circuit 19, and a predetermined set by the remote-control remote controller 24. The circulation is continued at a predetermined hot water temperature until the reheating condition is satisfied.

  In this way, the hot water supplied to the bath heat exchanger 27 is branched from the hot water supply path 3 constituting the hot water supply circuit, and the hot water supply circulation circuit 19 is formed, thereby securing high temperature water necessary for the bath reheating operation. On the other hand, hot water supply priority operation that can adjust and supply hot water in a wide range from high temperature water to low temperature water to the hot water supply circuit can be ensured.

  Here, the latent heat recovery heat exchanger 16 that recovers the latent heat of the combustion exhaust gas is located downstream of the hot water supply heat exchanger 15 with respect to the exhaust gas path, and is upstream of the hot water supply heat exchanger 15 with respect to the water supply path. The hot water heated by the latent heat recovery heat exchanger 16 is heated by the hot water supply heat exchanger 15. As a result, the amount of heat generated by the combustion of the burner 2 can be efficiently exchanged even during the bath chasing operation, leading to energy saving.

  Further, by supplying hot water mixed in the pouring circuit 32 from the hot water outlet 3 on the downstream side of the bypass passage 4, the hot water is efficiently heated by the latent heat recovery heat exchanger 16 and the hot water supply heat exchanger 15. After the hot water is mixed with the water supplied from the bypass passage 4 to secure the desired hot water, the hot water is supplied to the bath circuit 28 from the pouring circuit 32, thereby enabling an efficient bath operation.

In the present reference embodiment as described above, by configuring the reheating hot water supply and a bath in a single heating path, miniaturization of the device by simplifying the body structure including a pipe structure, as well as lighter, latent heat By improving efficiency through recovery, it is possible to ensure both hot water supply performance and bath retreat performance at the same time.

( Reference form 3)
Figure 4 shows a structural diagram of a water heater in the third reference embodiment of the present invention.

This reference form is a heating heat exchanger for supplying heat to a heating circuit having a radiator 21 that performs heating, bathroom drying, etc., as a use-side heat exchanger of the hot water supply apparatus in the first reference form, and a bath The present invention relates to a hot water supply apparatus using a bath heat exchanger that supplies heat to a bath circuit that performs reheating. In addition, the thing of the same code | symbol as the 1st reference form has the same structure, and abbreviate | omits description.

  The heat exchanger 18 for heating and the heat exchanger 27 for bath 27 are connected in parallel to the hot water supply circulation circuit 19, and the high-temperature water heated by the latent heat recovery heat exchanger 16 and the hot water supply heat exchanger 15 is circulated by the circulation pump 17. Then, heat is exchanged to supply heat to the heating circuit 20 or the bath circuit 28.

  Next, the operation and action will be described. During the heating operation, the heating pump 22 provided in the heating circuit 20 is driven by the operation command of the radiator 21, and the pump 17 that circulates the hot water in the hot water supply circulation circuit 19 in conjunction with it. The warm water heated by the hot water supply heat exchanger 15 that ignites the burner 2 by driving and collects the burned heat is heat-exchanged by the heating heat exchanger 18 and transferred to the heating circuit 20. Heat of the heating circuit 20 received by the heating heat exchanger 18 is radiated as warm air by the radiator 21.

  Further, during bath operation, when the bath circulation pump 29 provided in the bath circuit 28 is driven by the operation command of the remote control remote controller 24 and the circulation is detected by the water flow detection unit 30, the hot water supply circulation circuit 19 is interlocked. When the pump 17 that circulates the hot water is driven, the burner 2 is ignited, and the hot water heated by the hot water heat exchanger 15 that recovers the burned heat is heat-exchanged by the bath heat exchanger 27 and the bath circuit 28 Heat is transferred to. The heat of the bath circuit 28 received by the bath heat exchanger 27 is circulated to the bathtub 31 and reheated.

  Further, during heating and bath simultaneous operation, the heating circuits 20 and the pumps 22 and 29 of the bath circuit 28 are driven by the operation commands from the radiator 21 and the remote control remote controller 24, and combustion is started by the ignition operation of the burner 2. By this combustion, the circulating water in the hot water supply circuit 19 is heated by the latent heat recovery heat exchanger 16 and the hot water heat exchanger 15 and circulates while maintaining a predetermined high-temperature water state. This high-temperature circulating water is supplied to the heating heat exchanger 20 and the bath heat exchanger 27 at substantially the same temperature, and is transferred to the heating circuit 20 and the bath circuit 28.

  Moreover, simultaneous operation by a combination other than the above is possible, and the heat exchanger 20 for heating and the heat exchanger 27 for bath 27 are configured in parallel to the hot water supply circulation circuit 19, so that the passage resistance of the circulation circuit is reduced. Therefore, the circulation pump 17 can be reduced in size and weight.

  In this way, hot water supplied to the use side heat exchanger is branched from the hot water supply path 3 constituting the hot water supply circuit to form a hot water supply circulation circuit 19, thereby securing high temperature water necessary for operation of the use side load. On the other hand, hot water supply priority operation that can adjust and supply hot water in a wide range from high temperature water to low temperature water to the hot water supply circuit can be ensured.

  Here, the latent heat recovery heat exchanger 16 that recovers the latent heat of the combustion exhaust gas is located downstream of the hot water supply heat exchanger 15 with respect to the exhaust gas path, and is upstream of the hot water supply heat exchanger 15 with respect to the water supply path. The hot water heated by the latent heat recovery heat exchanger 16 is heated by the hot water supply heat exchanger 15. Thereby, the heat quantity generated by the combustion of the burner 2 can be efficiently exchanged even during operation of a plurality of usage-side loads, leading to energy saving.

(Embodiment 1 )
FIG. 5 is a structural diagram of the hot water supply apparatus according to the first embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the site | part which is common in what was mentioned above in the 1st-3rd reference form, and the overlapping description is abbreviate | omitted.

In FIG. 5, this hot water supply apparatus includes a hot water supply circuit 40 that heats the water supplied from the water supply passage 1 by the hot water supply heat exchanger 15 and supplies hot water to the hot water supply passage 3, and the hot water supply branched from the hot water supply passage 3. A hot water supply circulation circuit 41 that is supplied to the use-side heat exchanger via the circulation pump 17 and then reaches the hot-water supply heat exchanger 15, a heating heat exchanger 18 as the use-side heat exchanger, and a heating or bathroom A heating circuit 20 in which hot and cold water circulates through a heating circulation pump 22 between a radiator 21 which is a heating device for drying and the like, a bath heat exchanger 27 as a use side heat exchanger, and a bathtub 31 There is a bath circuit 28 through which hot water circulates through a bath circulation pump 29.
The hot water circulation pump 17 and the gas proportional valve 8 that adjusts the amount of gas supplied to the burner 2 are controlled by the control device 43, and the control device 43 is controlled by a kitchen remote control 24a, which is a remote control remote control. A command such as temperature is issued from the heating remote controller 24b, the bathroom remote controller 24c, or the like.

  From the above configuration, only the hot water supply heat exchanger 15 heats water to make hot water, and all the functions such as hot water supply, heating, bathing, etc. are performed on the hot water heated by the hot water supply heat exchanger 15. Therefore, the full capacity of the hot water supply heat exchanger 15 can be used if necessary when performing any one of functions such as hot water supply, heating, and bathing. Thereby, compared with the case where the heating means is provided for each function, the result is that the capability of each function is improved.

In the hot water supply circuit 40, as described above, the latent heat recovery heat exchanger 16 is provided downstream of the exhaust passage 13 that is the combustion exhaust gas path of the burner 2 of the hot water supply heat exchanger 15 and upstream of the water supply path 1. Has been placed.
Accordingly, water or the like supplied from the water supply channel 1 is first preheated to some extent by the latent heat recovery heat exchanger 16 and then heated by the hot water supply heat exchanger 15.

Below the latent heat recovery exchanger 16, there is provided a latent heat recovery heat exchanger tray 16j for receiving condensed water from the latent heat recovery heat exchanger 16, and further the condensation received by the latent heat recovery heat exchanger tray 16j. A neutralization device 42 for neutralizing and draining water is provided.
The neutralizing device 42 is provided with a water level gauge 42 a for measuring the water level in the neutralizing device 42, and the measured value is sent to the control device 43. Moreover, the hot water which overflowed in the neutralization apparatus 42 will be discarded.

Further, the heating circuit 20 is provided with a tank 44 that heats hot water heated on the secondary side of the heating heat exchanger 18 to the radiator 21 by the heating circulation pump 22 to radiate heat and temporarily stores the returned hot water. Yes. This absorbs an increase in volume when hot water expands during heating, and compensates for a decrease in the amount of hot water circulating in the heating circuit 20 due to evaporation or the like. The tank 44 is provided with a water level gauge 44 a that measures the amount of hot water contained in the tank 44. Further, when the water level in the tank 44 falls below a certain value, water is replenished by a replenishment pipe 45 branched from the water supply channel 1 and connected to the tank 44, and the heating circuit 20 Prevents the water from emptying. On the other hand, the hot water overflowing the tank 44 is discarded.
The heating circulation pump 22 is controlled by the heating remote controller 24b via the control device 43. The water level gauge 44 a is connected to the control device 43, and the water level data in the tank 44 is sent to the control device 43.

  In the bath circuit 28, the hot water filled in the bathtub 31 is pumped up by the bath circulation pump 29 and sent to the secondary side of the bath heat exchanger 27 to be heated (re chased). It comes to return. The bath circulation pump 29 is controlled by the bathroom remote controller 24c via the control device 43.

Next, control of the hot water supply circulation pump 17 by the control device 43 during hot water supply, heating, and chasing will be described.
When hot water supply is started after the hot water supply is stopped, hot water (so-called “dead water”) that is not used because it is not sufficiently heated is generated. In order to eliminate this, the control device 43 operates the hot water supply circulation pump 17 from time to time even when hot water supply is stopped, so as to keep the temperature of the hot water circulated by the hot water supply heat exchanger 15 above a certain level. Thereby, dead water can be reduced and hot water can be supplied immediately at the time of hot water supply start.

  In addition, when the hot water supply is stopped, the hot water supply is stopped when the hot water tap 6 is closed, and the water supply is also stopped. However, the hot water supply heat exchanger 15 further heats the hot water remaining in the hot water supply heat exchanger 15 due to residual heat (so-called “so-called hot water supply”). "After boiling"), the next time the hot water tap 6 is opened, hot hot water will be discharged first, which is dangerous. Therefore, the control device 43 operates the hot water supply circulation pump 17 for a while after stopping the hot water supply to circulate hot water, and stops the hot water supply circulation pump 17 after the remaining heat of the hot water supply heat exchanger 15 has subsided. Control.

Next, control during heating will be described.
The control device 43 controls the flow rate of the hot water supply circulation pump 17 in accordance with the size of the heating load. When the load of the radiator 21 that is a heating device is large, that is, when the amount of heat released by the radiator 21 as heating is large, the amount of heat that must be supplied from the heating heat exchanger 18 to the heating circuit 20 increases. The hot water circulation pump 17 is controlled to increase the flow rate of hot water circulating through the hot water supply circulation circuit 19 so that a large amount of heat can be transmitted to the heating circuit 20.

  On the other hand, when the heating load is small, the flow rate of the hot water supply circulation pump 17 is controlled to be reduced. That is, when a large amount of hot water is circulated to the heating heat exchanger 18 by the hot water supply circulation pump 17 even though the heating load is small, the hot water is returned to the hot water supply heat exchanger 15 as it is. Decreases. For this reason, the thermal efficiency is prevented from being reduced by reducing the flow rate of the hot water supply circulation pump 17.

In addition, the flow rate of the hot water supply circulation pump 17 is controlled to increase at the start of heating so that a large amount of hot water circulates in the heating heat exchanger 18 at the start of heating. Thereby, it can be made to become warm immediately at the time of heating start-up.
Further, when the flow rate of hot water supplied from the hot water supply passage 3 is a certain amount (for example, about 10 L / min) or more, sufficient hot water is supplied to the heating heat exchanger 18 without turning the hot water supply circulation pump 17. Therefore, the hot water supply circulation pump 17 is controlled to stop. Thereby, power consumption can be reduced.

  When heating is performed in parallel with hot water supply, the flow rate of the hot water supply circulation pump 17 is controlled to be reduced or stopped. That is, in the case where the hot water supply and the heating are performed in parallel, if the flow rate of the hot water supply circulation pump 17 is increased when the water supply water pressure is low (for example, about 50 kPa or less), the circulating hot water pressure exceeds the water supply pressure. Therefore, the amount of hot water can be reduced by reducing the amount of circulating hot water, thereby preventing a decrease in the amount of hot water and increasing the amount of hot water.

Next, control during chasing will be described.
The control device 43 controls the flow rate of the hot water supply circulation pump 17 according to the size of the additional load. When the reheating load of the bath is large, that is, when reheating the hot water filled in the bathtub 31 with a large temperature difference, the amount of heat that must be supplied from the bath heat exchanger 27 to the bath circuit 28 is large. Become. For this reason, by controlling to increase the flow rate of the hot water circulated by the hot water supply circulation pump 17, a large amount of heat can be transmitted to the bath circuit 28.

  In addition, when bathing is performed in parallel with hot water supply, the flow rate of the hot water supply circulation pump 17 is controlled to be reduced or stopped. This is because, when performing hot water supply and bath retreating in parallel, when the water supply water pressure is low (for example, about 50 kPa or less), if the flow rate of the hot water supply circulation pump 17 is increased, the pressure of the circulating hot water is increased. This is because the water supply is suppressed by overcoming the pressure and the water supply amount is reduced. Therefore, by reducing the amount of circulating hot water, it is possible to prevent a decrease in the amount of water supply and increase the amount of hot water supply.

Next, detection of water leakage will be described.
First, when the water pipe 16g of the latent heat recovery heat exchanger 16 is perforated due to corrosion or the like and leaks water, the latent heat recovery heat exchanger tray provided below the latent heat recovery heat exchanger 16 Since the hot water leaked by 16j is collected and discharged, a large amount of water may be wasted before the user notices.
Therefore, a neutralizing device 42 for storing, neutralizing and draining the condensed water received by the latent heat recovery heat exchanger tray 16j is provided, and the water level of the neutralizing device 42 is detected and sent to the control device 43. The control device 43 is continuously provided with minute water flow (for example, about 1 L / min or less) such that it is determined that hot water is not used based on a signal from the feed water flow sensor 23. When a signal indicating that the water level is rising is received, it is determined that water leakage has occurred in the latent heat recovery heat exchanger 16. Thereby, the water leak of the heat exchanger 16 for latent heat recovery can be discovered at an early stage.

In addition, when the pipe of the heating heat exchanger 18 has a hole due to corrosion or the like and leaks water, the tank 44 provided on the downstream side of the radiator 21 overflows and drains, so that the user can There is a risk that a large amount of water may be wasted before it is noticed.
Therefore, a water level gauge 44 a is provided in the tank 44 to send water level data to the control device 43. The control device 43 has a continuous flow of minute water (for example, about 1 L / min or less) such that it is determined that hot water is not being used based on a signal from the hot water flow rate sensor. If the water has increased, it is determined that water has leaked from the heating heat exchanger 18. Thereby, the water leak of the heat exchanger 18 for heating can be discovered at an early stage.

Furthermore, if the pipe of the bath heat exchanger 27 has a hole due to corrosion or the like and leaks, the water is drained to the bathtub 31 through the bath circuit 28, so that a large amount of water is wasted before the user notices it. There is a risk of making it.
Therefore, the control device 43 is continuously provided with minute water flow (for example, about 1 L / min or less) such that it is determined that hot water is not used based on a signal from the hot water flow rate sensor. If there is no rise in the water level between the tank 42 and the tank 44, it is determined that water leakage has occurred on the primary side of the bath heat exchanger 27. Thereby, the water leak of the heat exchanger 27 for baths can be discovered at an early stage.

  In addition, when the hot water tap 6 is incompletely closed, hot water comes out of the faucet, so the water supply side flow rate sensor 23 detects the water flow even though the hot water is not used. Further, even when water leakage occurs somewhere in the hot water supply circuit 40, the water supply side flow rate sensor 23 similarly detects the water flow. Although it is difficult to distinguish between the two, it is usually considered that there are few cases where the tap from the faucet continues for one month or more, for example, when the water supply side flow rate sensor 23 detects the water flow for a long period of time even though no hot water is used. The control device 43 determines that water leakage has occurred in the hot water supply circuit 40.

In addition, in each reference form and embodiment mentioned above, although the case where the burner 2 combusted with gas was used was demonstrated, the burner combusted with oil can also be used. Further, instead of the burning burner, it is also possible to use, as a heat source, an electric heat generated by electricity, a tank for storing hot water produced by electric heating or the like.

  As described above, the hot water supply apparatus according to the present invention has a hot water supply and heating system, a hot water supply and a bath, or a hot water supply and a heating and a bath as a single heat source. Since it is possible to reduce the weight, the installation space is secured, the workability is improved, and the latent heat recovery heat exchanger is provided, so it is possible to achieve high efficiency and save energy by reducing running costs. It can also be applied to uses such as petroleum hot water bath equipment and hot water heaters.

It is a block diagram of the hot water supply apparatus in the reference form 1 of this invention. It is a structural diagram of the latent heat recovery heat exchanger of the hot water supply apparatus. It is a block diagram of the hot-water supply apparatus in the reference form 2 of this invention. It is a block diagram of the hot water supply apparatus in the reference form 3 of this invention. It is a structure figure of the hot water supply apparatus in Embodiment 1 of this invention.

Explanation of symbols

1 Water supply path 2 Burner (heating means)
3 Hot water outlet 13 Exhaust passage (exhaust heat passage)
DESCRIPTION OF SYMBOLS 15 Heat exchanger for hot water supply 16 Heat exchanger for latent heat recovery 17 Circulation pump for hot water supply 18 Heat exchanger for heating (use side heat exchanger)
19 Hot-water supply circulation circuit 27 Heat exchanger for bath (use side heat exchanger)
20 Heating circuit 21 Radiator (heating device)
22 Circulation pump for heating 28 Bath circuit 29 Circulation pump for bath 31 Bathtub 40 Hot water supply circuit

Claims (1)

A hot water supply circuit for heating the water supplied from the water supply channel with a heat exchanger for hot water supply and supplying hot water to the hot water supply channel;
A hot water supply circulation circuit that branches from the hot water supply passage and is supplied to the use-side heat exchanger via the hot water supply circulation pump, and then reaches the hot water supply heat exchanger;
A heating circuit that circulates between a heat exchanger for heating as the use side heat exchanger and a heating device via a circulation pump for heating;
A bath circuit that circulates between the bath heat exchanger as the use-side heat exchanger and the bathtub via a bath circulation pump;
A control device;
A hot water supply device comprising:
The control device is a hot water supply device that controls to stop the hot water supply circulation pump when the flow rate of hot water supply is a certain amount or more during heating or bathing .

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