JP5598322B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus.

  2. Description of the Related Art Conventionally, there is a hot water supply device that supplies mixed water obtained by mixing water flowing through a water supply pipe and hot water flowing through a hot water supply pipe to a supply unit such as a faucet. In such a hot water supply apparatus, there exists a thing which brings the temperature of mixed water close to preset temperature by changing the mixing ratio of the water which flows through a water supply pipe, and the warm water which flows through a hot water supply pipe. Moreover, in order to mix the water which flows through a water supply pipe, and the warm water which flows through a hot water supply pipe, the mixing valve to which the water supply pipe and the hot water supply pipe were connected may be used.

  For example, a hot water supply system disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2006-125773) mixes a water supply pipe, a hot water supply pipe, water from the water supply pipe, and hot water from the hot water supply pipe (corresponding to hot water). And a mixed hot water supply pipe (corresponding to a supply pipe) for supplying mixed hot water (corresponding to mixed water) from the electric hot water / water mixing valve. In addition, in this hot water supply system, the opening degree of the electric hot water mixing valve when the temperature of the mixed hot water becomes equal to the set temperature during the supply of the mixed hot water in order to prevent a significant fluctuation in the hot water temperature when the mixed hot water supply is resumed. Is stored as a stable opening, and the opening of the electric hot water mixing valve is adjusted so that the supply of mixed hot water is resumed at the stored stable opening.

  By the way, when the opening degree of the mixing valve is adjusted to a predetermined opening degree such as a stable opening degree while the supply is stopped before the supply is restarted, the temperature of the mixed water supplied to the supply unit immediately after the supply restart is higher than the set temperature. May be higher or lower. Then, after resuming the supply of the mixed water, the mixed water having a temperature different from the set temperature is supplied to the supply unit, which causes discomfort to the user.

  Then, the subject of this invention is providing the hot-water supply apparatus which can reduce a possibility of giving a user discomfort.

A hot water supply apparatus according to a first aspect of the present invention includes a water supply pipe, a hot water supply pipe, a mixing valve, a supply pipe, and a control unit. Water flows through the water supply pipe. Hot water having a temperature higher than that flowing through the water supply pipe flows through the hot water supply pipe. A water supply pipe and a hot water supply pipe are connected to the mixing valve. The mixing valve mixes water flowing through the water supply pipe and hot water flowing through the hot water supply pipe. The supply pipe is connected to the mixing valve. Moreover, a supply pipe | tube flows the mixed water which consists of the water mixed in the mixing valve and warm water to a supply part. The control unit includes a determination unit and a monitoring unit . The determination unit determines whether or not the supply of mixed water to the supply unit has been resumed. The monitoring unit monitors the temperature change of the mixed water after the supply of the mixed water to the supply unit is resumed. Moreover, a control part changes the mixing ratio of the water mixed in a mixing valve, and warm water by adjusting the opening degree of a mixing valve. Further, the control unit adjusts the opening of the mixing valve so that when the supply of the mixed water to the supply unit is stopped, the predetermined opening is changed to the stop opening. The predetermined opening is the opening of the mixing valve before the supply of mixed water to the supply unit is stopped. The rest opening is an opening of a mixing valve having a ratio of water or hot water larger than the mixing ratio of the mixed water and hot water at the predetermined opening, and is determined based on the monitoring result of the monitoring unit. It is a degree . In addition, when the determination unit determines that the supply of the mixed water to the supply unit has been resumed, the control unit immediately adjusts the opening of the mixing valve so that the predetermined opening is obtained from the stop opening.

  As a result of intensive studies, the inventor has adjusted the opening of the mixing valve from when supply of mixed water to the supply unit is suspended to when supply is resumed, so that the supply unit immediately after resumption of supply. It has been found that the temperature of the supplied mixed water approaches the set temperature.

  Therefore, in the hot water supply apparatus according to the first aspect of the present invention, when the supply of the mixed water to the supply unit is stopped, the opening of the mixing valve is adjusted so that the predetermined opening is changed to the stop opening. When the supply of mixed water to the section is resumed, the opening of the mixing valve is adjusted so that the predetermined opening is obtained from the rest opening. For this reason, the possibility that the mixed water having a temperature different from the set temperature is supplied to the supply unit immediately after the supply of the mixed water is resumed can be reduced.

  As a result, it is possible to reduce the possibility of discomfort to the user.

  Further, in this hot water supply apparatus, when the supply of the mixed water to the supply unit is resumed, the opening of the mixing valve is immediately adjusted to the predetermined opening, so that the mixed water supplied from the supply unit after the supply is resumed It is possible to make it difficult to cause a difference between the temperature and the set temperature.

  Furthermore, in this hot water supply apparatus, since the rest opening is determined based on the monitoring result of the monitoring unit, the rest opening can be determined according to the temperature change of the supplied mixed water.

  The hot water supply device according to a second aspect of the present invention is the hot water supply device according to the first aspect, further comprising a setting unit and a detection unit. The setting unit can set the temperature of the mixed water supplied from the supply unit. The detection unit can detect the temperature of the mixed water flowing through the supply pipe. Further, the control unit is an opening when the mixed water is supplied to the supply unit, and a difference between the temperature of the mixed water detected by the detection unit and the set temperature set by the setting unit is within a predetermined range. The opening of the mixing valve when it becomes is determined to be a predetermined opening. For this reason, for example, compared with the case where the predetermined opening is determined to be an opening unrelated to the set temperature, the difference between the set temperature and the temperature of the mixed water supplied from the supply unit after resumption of supply is reduced. be able to.

The hot water supply apparatus according to the third aspect of the present invention is the hot water supply apparatus according to the first aspect or the second aspect , in which the control unit is when the temperature change of the mixed water monitored by the monitoring unit is a change to the high temperature side. Determines the rest opening so that the ratio of water is larger than the mixing ratio of the water of the mixed water and the warm water at the predetermined opening. In this hot water supply apparatus, when the temperature change of the mixed water after the supply is resumed is a change to the high temperature side, the ratio of the water is larger than the mixing ratio of the mixed water and the hot water at the predetermined opening degree. The rest opening degree can be determined as follows.

In the hot water supply device according to the fourth aspect of the present invention, in the hot water supply device according to any one of the first to third aspects, the controller is configured such that the temperature change of the mixed water monitored by the monitoring unit is a change to the low temperature side. In this case, the pause opening degree is determined so that the ratio of the hot water is larger than the mixing ratio of the water of the mixed water and the hot water at the predetermined opening degree. In this hot water supply apparatus, when the temperature change of the mixed water after the supply is resumed is a change to the low temperature side, the ratio of the hot water is larger than the mixing ratio of the water of the mixed water and the hot water at the predetermined opening degree. The rest opening degree can be determined as follows.

  In the hot water supply apparatus according to the first aspect of the present invention, the possibility of giving the user unpleasant feeling can be reduced.

  In the hot water supply apparatus according to the second aspect of the present invention, it is possible to reduce the difference between the temperature of the mixed water supplied from the supply unit and the set temperature after resumption of supply.

In the hot water supply apparatus according to the third aspect of the present invention, when the temperature change of the mixed water after the supply is resumed is a change to the high temperature side, the mixing ratio of the mixed water and the hot water at the predetermined opening degree The rest opening degree can be determined so that the ratio of water becomes larger than that.

In the hot water supply apparatus according to the fourth aspect of the present invention, when the temperature change of the mixed water after the supply is resumed is a change to the low temperature side, the mixing ratio of the water of the mixed water and the hot water at the predetermined opening degree The rest opening degree can be determined so that the ratio of hot water becomes larger than that.

The piping system figure of the hot water storage type hot-water supply apparatus which concerns on 1st Embodiment of this invention. The control block diagram of a control apparatus. The flowchart which shows the flow of control of the hot water supply mixing valve by an opening degree control part. The figure which shows the relationship between the temperature of mixed water, and the opening degree of a hot water supply mixing valve. The figure which shows the relationship between the temperature of mixed water, and the opening degree of a hot water supply mixing valve. The control block diagram of the control apparatus with which the hot water storage type hot-water supply apparatus which concerns on 2nd Embodiment of this invention is provided. The figure which shows the correspondence of a temperature change value range and correction amount. The flowchart which shows the flow of control of the hot water supply mixing valve by an opening degree control part. The flowchart which shows the flow of control of the hot water supply mixing valve by an opening degree control part.

  Hereinafter, a hot water storage type hot water supply apparatus (corresponding to a hot water supply apparatus) 1 according to an embodiment of the present invention will be described with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

<First Embodiment>
(1) Configuration of a hot water storage type hot water supply device The hot water storage type hot water supply device 1 is water having a high temperature (hereinafter, higher than normal temperature water) boiled by heating means (heat pump unit 83 in this embodiment). Or hot water is stored in a hot water storage tank 11 provided in the hot water storage unit 10, and the stored hot water and water (hereinafter referred to as hot water) are supplied to the bathtub 18 according to the operation of the user. Or it supplies to supply parts 16 (for example, a shower, a kitchen faucet, etc.) 16 other than bathtub 18.

  The hot water storage type hot water supply apparatus 1 mainly includes a heat pump unit 83, a hot water storage unit 10, and a control device 90 (see FIGS. 1 and 2). Below, the various components with which the hot water storage type hot-water supply apparatus 1 is provided are demonstrated.

(2) Configuration of Heat Pump Unit The heat pump unit 83 functions by obtaining electric power as a heat source device for producing hot water. Specifically, the heat pump unit 83 includes a refrigerant circuit in which a refrigerant (for example, a carbon dioxide refrigerant) circulates. In the refrigerant circuit, the discharge side of the compressor, the refrigerant side of the water heat exchanger, the high pressure side in the internal heat exchanger, the expansion valve, the air heat exchanger, the low pressure side in the internal heat exchanger, the suction of the compressor The devices are connected in this order, and the refrigerant is circulated inside.

  The internal heat exchanger exchanges heat between the refrigerant flowing through the high-pressure side pipe and the refrigerant flowing through the low-pressure side pipe. The water heat exchanger has a refrigerant pipe, and is between the high-temperature refrigerant discharged from the compressor and flowing into the refrigerant pipe, and the hot water flowing into the water pipe 25 from the hot water storage pipe 21 of the hot water storage unit 10 described later. Heat exchange. By the heat exchange in the water heat exchanger, the refrigerant passing through the refrigerant pipe is cooled, and the hot water passing through the water pipe 25 is heated, so that the temperature of hot water flowing into the hot water return pipe 22 of the hot water storage unit 10 to be described later is increased. Can be raised. As a result, hot water having a temperature higher than the temperature of the hot water flowing through the hot water outlet pipe 21 flows through the hot water return pipe 22 of the hot water storage unit 10.

  The heat pump unit 83 includes various sensors. Examples of the various sensors include sensors that detect temperature and pressure related to the refrigerant. Specifically, various sensors include a suction pressure sensor that detects refrigerant pressure that passes through the suction side of the compressor, a suction thermistor that detects refrigerant temperature that passes through the suction side of the compressor, and passes through the discharge side of the compressor. Discharge pressure sensor for detecting refrigerant pressure to be discharged, discharge thermistor for detecting refrigerant temperature passing through the discharge side of the compressor, and a refrigerant thermistor after water heat exchange for detecting the temperature of the refrigerant cooled by passing through the water heat exchanger There are an outside thermistor for detecting the temperature of the outside air, a refrigerant thermistor after the air heat exchange for detecting the temperature of the refrigerant after being heated in the air heat exchanger, and the like. It is provided so that it can be grasped.

(3) Configuration of Hot Water Storage Unit The hot water storage unit 10 is an apparatus that uses room temperature water supplied from the outside, such as city water, while heating and storing it with heat obtained from the heat pump unit 83. Further, as shown in FIG. 1, the hot water storage unit 10 includes a hot water storage tank 11, a hot water circulation circuit 20, a memorial heat exchanger 12, a memorial heat source circuit 30, a memorial heat utilization circuit 40, a hot water supply piping system 50, and A pipe joint 70 and the like are provided.

  The hot water storage unit 10 includes a casing 13 having a substantially rectangular parallelepiped shape. Further, the hot water storage tank 11, a part of the hot water circulation circuit 20, the remedy heat exchanger 12, the remedy heat source circuit 30, the remedy use circuit 40, a part of the hot water supply piping system 50, and a part of the pipe joint 70. Is housed in the casing 13 (see FIG. 1).

(3-1) Hot Water Storage Tank The hot water storage tank 11 is a tank for storing hot water and water obtained by heat derived from the heat pump unit 83 in advance before being used by the user. The hot water storage tank 11 is formed in a cylindrical shape, for example, and can store hot water therein.

  Further, a water temperature thermistor T1 is disposed at the upper part of the hot water storage tank 11, and a plurality of remaining hot water amount thermistors T2 to T6 are disposed on the side surface of the hot water storage tank 11 at predetermined intervals across the top and bottom. Has been. The water temperature thermistor T1 and the remaining hot water amount thermistors T2 to T6 measure the temperature of hot water in the hot water storage tank 11. Further, the water temperature thermistor T1 and the remaining hot water amount thermistors T2 to T6 are respectively disposed at height positions corresponding to the remaining hot water amount of the hot water storage tank 11.

(3-2) Hot Water Circulation Circuit The hot water circulation circuit 20 is a circuit for transmitting heat obtained by the heat pump unit 83 to the hot water in the hot water storage tank 11, and includes a hot water outlet pipe 21, a hot water return pipe 22, It has a boiling pump P1, a three-way valve 60 for drainage, and a three-way valve 24 for boiling.

  The hot water storage pipe 21 is a pipe that connects the vicinity of the lower end portion of the hot water storage tank 11 and the upstream end portion of the water pipe 25 of the water heat exchanger located in the heat pump unit 83. The hot water storage pipe 21 is connected to the first hot water storage pipe 21a that connects the vicinity of the lower end of the hot water storage tank 11 and the three-way valve 60 for drainage, and the second that connects the three-way valve 60 for drainage and the heat pump circulation outlet 10a. It includes a hot water storage pipe 21b, and a third hot water storage pipe 21c that connects the heat pump circulation outlet 10a and the upstream end of the water pipe 25 of the water heat exchanger. A boiling pump P1 is provided in the middle of the second hot water storage pipe 21b. The boiling pump P1 is a pump for sending hot water from the drainage three-way valve 60 toward the heat pump circulation outlet 10a.

  The hot water storage return pipe 22 is a pipe that connects the downstream end of the water pipe 25 of the water heat exchanger to the vicinity of the upper end and the lower end of the hot water storage tank 11. The hot water storage return pipe 22 includes a first hot water storage return pipe 22a connecting the downstream end of the water pipe 25 of the water heat exchanger and the heat pump circulation return port 10b, a heat pump circulation return port 10b, a boiling three-way valve 24, and the like. The second hot water storage return pipe 22b for connecting the hot water, the third hot water return pipe 22c for connecting the boiling three way valve 24 and the upper end of the hot water storage tank 11, and the boiling three way valve 24 and the lower end of the hot water storage tank 11 are connected. And a fourth hot water storage return pipe 22d.

  The boiling three-way valve 24 is an electric valve whose opening degree is adjusted by an electric motor. The boiling three-way valve 24 adjusts the opening degree of the valve body under the control of the control device 90, so that the hot water flowing from the first hot water storage return pipe 22a side to the second hot water storage return pipe 22b side is converted into the third hot water storage hot water. It flows into the return pipe 22c and flows out into the hot water storage tank 11 from the upper end of the hot water storage tank 11, or flows into the fourth hot water storage return pipe 22d and flows out from the lower end of the hot water storage tank 11 into the hot water storage tank 11.

  In the hot water circulation circuit 20, the boiling pump P <b> 1 is driven by the control of the control device 90, so that hot water having a low temperature existing in the hot water in the hot water storage tank 11 flows out to the hot water outlet pipe 21. The temperature is raised by passing through the water pipe 25 of the water heat exchanger, and returned to the vicinity of the upper end of the hot water storage tank 11 or the vicinity of the lower end of the hot water storage tank 11 via the hot water return pipe 22. Thereby, the temperature of the hot water in the hot water storage tank 11 can be made comparatively high.

  The three-way valve 60 for drainage is a manual valve in which the opening degree of the valve body is adjusted by a user operating an operation unit (not shown). In the drainage three-way valve 60, the state of the valve body is adjusted by the user, so that the hot water flowing from the first hot water storage pipe 21a flows out to the second hot water storage pipe 21b side, The hot water flowing from the hot water storage pipe 21 a side is switched to the state of flowing out to the discharge pipe 80 side and going to the drain port 74. The drainage three-way valve 60 is normally set in a state in which hot water flowing from the first hot water storage pipe 21a side flows out to the second hot water storage pipe 21b side.

(3-3) Remembrance Heat Exchanger Remembrance heat exchanger 12 includes heat source pipe 12a through which hot water in hot water storage tank 11 circulates, and utilization pipe through which hot water or water circulated in bathtub 18 outside casing 13 circulates. 12b. In the memorial heat exchanger 12, the temperature of hot water or water flowing through the use pipe 12b is increased by causing heat exchange between hot water flowing through the heat source pipe 12a and hot water or water flowing through the use pipe 12b. Can do.

(3-4) Remembrance heat source circuit The recuperation heat source circuit 30 uses the temperature of hot water or water stored in the bathtub 18 outside the casing 13 and the heat of hot water stored in the hot water storage tank 11. Then, it is a circuit on the heat source supply side for further raising. The memorial heat source circuit 30 mainly includes a heat source forward pipe 31, a heat source return pipe 32, and a heat source pump P3.

  The heat source forward pipe 31 connects the vicinity of the upper end portion of the hot water storage tank 11 and the upstream end portion of the heat source pipe 12 a in the tracking heat exchanger 12. Further, a check valve B1 for preventing a back flow of hot water flowing from the hot water storage tank 11 side is disposed in the heat source forward pipe 31. The check valve B1 is disposed between the hot water storage tank 11 of the heat source forward pipe 31 and the branch point N1. The heat source return pipe 32 connects the downstream end of the heat source pipe 12 a in the tracking heat exchanger 12 and the vicinity of the lower end of the hot water storage tank 11. The heat source pump P <b> 3 is disposed in the middle of the heat source return pipe 32.

  In the remedy heat source circuit 30, the heat source pump P <b> 3 is driven by the control of the control device 90, so that hot water existing in the upper part of the hot water in the hot water storage tank 11 flows out to the heat source forward pipe 31, and is added. The temperature is lowered by passing through the heat source pipe 12 a in the soot heat exchanger 12, and returned to the vicinity of the lower end of the hot water storage tank 11 through the heat source return pipe 32.

  In addition, the remedy heat source circuit 30 includes a first drain pipe 34 for guiding high-temperature expanded water generated during the boiling operation to the drain port 74. The first drain pipe 34 is branched and connected to a branch point N1 of the heat source forward pipe 31, and is connected to a pipe joint 70 described later. The first drain pipe 34 is provided with a negative pressure operated relief valve 34a. When the water pressure in the hot water storage tank 11 is less than a predetermined water pressure, the negative pressure operation type relief valve 34 a closes the valve body, and the hot water in the hot water storage tank 11 passes through the first drain pipe 34 and is drained. It is forbidden to be discharged out of the hot water storage unit 10 from 74. On the other hand, when the water pressure in the hot water storage tank 11 is equal to or higher than a predetermined water pressure, the valve body is opened, and hot water (expanded water) in the hot water storage tank 11 passes through the first drain pipe 34 and the hot water storage unit 74. 10 is discharged outside.

(3-5) Remembrance Utilization Circuit The remembrance utilization circuit 40 is a circuit for obtaining the heat of the hot water stored in the hot water storage tank 11 via the recollection heat source circuit 30. The memorial use circuit 40 mainly includes a use forward pipe 41, a use return pipe 42, a use pump P2, external pipes 43 and 45, and a bathtub connection adapter 44.

  One end of the use outlet pipe 41 is connected to the external pipe 43 via the full circulation return port 10c. In addition, the other end of the use pipe 41 is connected to the upstream end of the use pipe 12 b in the tracking heat exchanger 12. Further, the use pipe 41 is provided with a bath thermistor T7 for detecting the temperature of the passing hot water or water. Furthermore, the usage pump P2 is provided in the middle of the usage outlet pipe 41.

  One end of the use return pipe 42 is connected to the external pipe 45 through the full circulation outlet 10d. The other end of the utilization return pipe 42 is connected to the downstream end of the utilization pipe 12 b in the tracking heat exchanger 12.

  The external pipe 43 connects the use pipe 41 and the bathtub connection adapter 44. The external pipe 45 connects the use return pipe 42 and the bathtub connection adapter 44. Moreover, the bathtub connection adapter 44 is arrange | positioned in the bathtub 18, and makes hot water flow out in the bathtub 18, or takes in hot water or water from the bathtub 18. FIG. The external pipes 43 and 45 and the bathtub connection adapter 44 are disposed outside the casing 13 as shown in FIG.

  In the memorial use circuit 40, the use pump P2 is driven by the control of the control device 90, so that the hot water or water in the bathtub 18 flows out from the external pipe 43 side to the use pipe 41 side through the bathtub connection adapter 44. The temperature is raised by passing through the use pipe 12b in the remnant heat exchanger 12 and returned to the bathtub 18 through the use return pipe 42 and the external pipe 45. Thereby, the temperature of the hot water or water of the bathtub 18 can be raised, and additional cooking can be performed.

(3-6) Hot-water supply piping system The hot-water supply piping system 50 is a path for using hot water stored in the hot water storage tank 11 while receiving supply of water from an external city water or the like. A hot water outlet pipe 52, a supply pipe 53, a hot water supply mixing valve 54, and a hot water beam mixing valve 55 are provided.

  The water supply pipe 51 is a pipe through which water supplied from outside city water or the like flows, and includes a first water supply pipe 51a, a second water supply pipe 51b, and a third water supply pipe 51c.

  The first water supply pipe 51 a connects the external water supply pipe 17 through which water supplied from a water source outside the hot water storage unit 10 flows and the hot water supply mixing valve 54. The external water supply pipe 17 and the first water supply pipe 51a are connected via the water supply connection port 10e. The first water supply pipe 51a guides normal temperature water supplied from an external water source to the hot water supply mixing valve 54 via the branch points N2 and N3. The first water supply pipe 51a has a strainer with a check valve between the water supply connection port 10e and the branch point N2, and a pressure reducing valve for reducing the water pressure of the water flowing in from the water supply connection port 10e to a predetermined water pressure. R is disposed. The strainer with a check valve includes a strainer S for removing dust contained in water flowing in from the water supply connection port 10e side, and a check valve B2 for preventing reverse flow of water flowing in from the water supply connection port 10e side. Including. Further, a water temperature thermistor T8 that detects the temperature of the water flowing through the first water supply pipe 51a is disposed in the vicinity of the branch point N2 in the first water supply pipe 51a. The first water supply pipe 51a is provided with a check valve B3 between the hot water mixing valve 54 and the branch point N3 for preventing the reverse flow of water flowing from the branch point N3 side.

  The second water supply pipe 51b is branched and connected to the branch point N3 of the first water supply pipe 51a, and connects the first water supply pipe 51a and the hot water beam mixing valve 55. The second water supply pipe 51b guides normal temperature water supplied from an external water source to the hot water mixing valve 55 via the branch points N2 and N3 of the first water supply pipe 51a.

  The third water supply pipe 51c is branched and connected to the branch point N2 of the first water supply pipe 51a, and connects the first water supply pipe 51a and the lower end portion of the hot water storage tank 11. The third water supply pipe 51c guides normal temperature water supplied from an external water source to the vicinity of the lower end of the hot water storage tank 11 through the branch point N2 of the first water supply pipe 51a. The third water supply pipe 51c is provided with a check valve B4 for preventing the backflow of water flowing from the branch point N2 side. The water flowing into the first water supply pipe 51a from the external water supply pipe 17 flows through the third water supply pipe 51c via the branch point N2 and is supplied to the hot water storage tank 11 due to the water pressure. As a result, the hot water storage tank 11 is always kept full.

  The hot water discharge pipe 52 has a first hot water discharge pipe 52 a for supplying hot water in the hot water storage tank 11 to the supply unit 16 that is a supply destination other than the bathtub 18, and a first hot water pipe for supplying hot water in the hot water storage tank 11 to the bathtub 18. 2 hot water discharge pipes 52b.

  The first hot water discharge pipe 52 a connects the upper end portion of the hot water storage tank 11 and the hot water supply mixing valve 54. Further, of the hot water stored in the hot water storage tank 11, hot water having a relatively high temperature that is present near the upper end flows through the first hot water discharge pipe 52 a. The first hot water discharge pipe 52a is provided with a check valve B5 for preventing a back flow of hot water flowing from the hot water storage tank 11 side.

  The second hot water outlet pipe 52b is branched and connected to the branch point N4 of the heat source forward pipe 31, and connects the heat source forward pipe 31 and the hot water mixing valve 55. The second outlet pipe 52b is configured to pass hot water present in the vicinity of the upper end of hot water stored in the hot water storage tank 11 through a part of the heat source forward pipe 31 to a hot water mixing valve 55. Lead to.

  The supply pipe 53 is a pipe through which hot water mixed with normal temperature water flowing through the water supply pipe 51 and hot hot water flowing from the vicinity of the upper end of the hot water storage tank 11 through the hot water discharge pipe 52. Note that hot water having a temperature between the temperature (normal temperature) of the water flowing through the first water supply pipe 51 a and the temperature of hot water existing near the upper end of the hot water storage tank 11 flows in the supply pipe 53. The supply pipe 53 includes a first supply pipe 53 a connected to the hot water mixing valve 54 and a second supply pipe 53 b connected to the hot water mixing valve 55.

  The end of the first supply pipe 53a opposite to the end connected to the hot water supply mixing valve 54 is connected to the external pipe 99 through the hot water supply connection port 10f. The external pipe 99 is connected to the supply unit 16, and the hot water flowing through the first supply pipe 53a flows to the supply unit 16 side. The first supply pipe 53a is provided with a hot water supply amount sensor FLS1 that detects the amount of hot water flowing inside, and a hot water supply thermistor T9 that detects the temperature of hot water flowing through the first supply pipe 53a. The hot water supply thermistor T9 and the hot water supply amount sensor FLS1 transmit information related to detection results detected every predetermined time (for example, 1 second) to the control device 90.

  The end of the second supply pipe 53b opposite to the end connected to the hot water mixing valve 55 is connected to the branch point N5 of the utilization return pipe. In other words, the second supply pipe 53 b bypasses the heat source forward pipe 31 of the tracking heat source circuit 30 and the use return pipe 42 of the tracking use circuit 40.

  The second supply pipe 53b is provided with a hot water quantity sensor FLS2 and a hot water thermistor T10. The hot water volume sensor FLS2 detects the amount of hot water flowing through the second supply pipe 53b. The hot water thermistor T10 is for detecting the temperature of the hot water flowing through the second supply pipe 53b. Furthermore, a hot water solenoid valve SV included in the composite water valve and two check valves B6 and B7 are disposed in the second supply pipe 53b. The hot water solenoid valve SV adjusts the amount of hot water flowing into the use return pipe 42 by adjusting the opening of the valve body by an electric motor. The check valves B6 and B7 are arranged so as to sandwich the hot water volume sensor FLS2. The check valves B6 and B7 prevent backflow of hot water flowing through the second supply pipe 53b toward the hot water mixing valve 55 or backflow of hot water from the bathtub 18.

  A second drain pipe 53c for guiding hot water flowing through the second supply pipe 53b to the drain port 74 is branched and connected to the branch point N6 of the second supply pipe 53b. In the present embodiment, the branch point N6 is located between the check valve B6 and the hot water volume sensor FLS2. The second drain pipe 53c is connected to a pipe joint 70 described later. Furthermore, the second drain pipe 53c is provided with a drain valve 59 included in the composite water valve. The drain valve 59 discharges hot water accumulated in the second supply pipe 53b from the drain port 74 to the outside of the casing 13 through the second drain pipe 53c when the valve body is opened. The drain valve 59 is configured to be electrically driven, and the opening degree of the valve body is adjusted under the control of the control device 90.

  The hot water mixing valve 54 is an electric valve whose opening degree is adjusted by an electric motor. The hot water mixing valve 54 adjusts the opening degree of the valve body under the control of the control device 90, so that the hot water from the first hot water discharge pipe 52a and the water from the first water supply pipe 51a are mixed at a desired mixing ratio. The mixed hot and cold water is allowed to flow out to the supply unit 16 through the first supply pipe 53a and the external pipe 99.

  The hot water mixing valve 55 is an electric valve whose opening degree is adjusted by an electric motor. The hot water beam mixing valve 55 adjusts the opening degree of the valve body under the control of the control device 90, so that the hot water from the second hot water discharge pipe 52b and the water from the second water supply pipe 51b are mixed in a desired mixing ratio. The mixed hot water is discharged to the bathtub 18 through a part of the second supply pipe 53b and the utilization return pipe 42.

(3-7) Piping Joint The piping joint 70 is configured so that all drainage generated in the hot water storage unit 10 is collected, and the collected wastewater is discharged from one drain port 74 to the outside of the hot water storage unit 10. Specifically, the pipe joint 70 is a pipe joint to which the discharge pipe 80, the first drain pipe 34, and the second drain pipe 53c connected to the drain three-way valve 60 are connected. For this reason, the waste water flowing through the plurality of pipes is discharged from one drain port 74 to the outside of the hot water storage unit 10.

(4) Configuration of the control device The control device 90 is based on the detection results of the thermistors T1 to T10 and the water volume sensors FLS1, FLS2, etc., and the valves 54, 55, 59, SV, the heat pump unit 83, and the pumps P1, P2. , P3 and other various devices are controlled. The control device 90 is connected to a controller 85 as shown in FIG. The controller 85 receives user operations. For example, the controller 85 includes a setting unit 86 that can set the temperature of hot water supplied from the supply unit 16. The setting unit 86 transmits information related to the set temperature set by the user to the control device 90. In addition, the control device 90 includes an opening degree adjustment unit 91 and a storage unit 92. Hereinafter, for convenience of explanation, hot water supplied from the supply unit 16 through the first supply pipe 53a is referred to as mixed water.

  The opening degree adjustment unit 91 adjusts the opening degree of the hot water supply mixing valve 54 in order to change the mixing ratio of the water mixed in the hot water supply mixing valve 54 and the hot water. Further, the opening degree adjusting unit 91 adjusts the opening degree of the hot water mixing valve 54 based on the set temperature set by the user operating the setting unit 86, the detection results of the hot water supply thermistor T9, and the hot water amount sensor FLS1. Stable opening adjustment control is performed. Specifically, the opening degree adjustment unit 91 in the stable opening degree adjustment control, the temperature of the mixed water based on the information about the temperature of the mixed water flowing through the first supply pipe 53a transmitted from the hot water supply thermistor T9, and the setting unit 86 The opening degree of the hot water supply mixing valve 54 is adjusted so that the set temperature based on the information related to the set temperature transmitted from is equal. The stable opening adjustment control is a control performed when the mixed water is supplied to the supply unit 16, and the opening adjustment unit 91 is information related to water amount detection greater than a predetermined amount (for example, 0 ml) from the hot water supply amount sensor FLS1. Is transmitted, it is determined that the supply to the supply unit 16 is started, and the stable opening adjustment control is started. Further, the opening degree adjustment unit 91 determines whether or not the supply of mixed water to the supply unit 16 has been resumed. Specifically, after determining that the opening degree adjusting unit 91 is in a supply pause state, which will be described later, and before determining that it is in a hot water supply stop state, which will be described later, information related to detection of a water amount greater than a predetermined amount from the hot water supply water amount sensor FLS1. Is transmitted, it is determined that the supply of the mixed water to the supply unit 16 has been resumed. Further, the opening degree adjusting unit 91 determines that the hot water supply stop state, which will be described later, is determined before it is determined to be in a supply pause state, which will be described later, and before information related to water amount detection greater than a predetermined amount is transmitted from the hot water supply water amount sensor FLS1. In such a case, it is determined that the supply of mixed water to the supply unit 16 has not been resumed. Hereinafter, for convenience of explanation, the opening degree of the hot water supply mixing valve 54 during the stable opening degree adjustment control is referred to as a predetermined opening degree. The opening adjustment unit 91 includes a stable opening determination unit 93 and a pause opening determination unit 94.

  The stable opening determination unit 93 is the opening of the hot water supply mixing valve 54 when the stable opening adjustment control is performed, and the difference between the temperature of the mixed water based on the detection result of the hot water supply thermistor T9 and the set temperature is The opening when the state within the predetermined range (for example, ± 0.5 ° C.) continues for the predetermined time (for example, 2 seconds) or more is determined as the stable opening (corresponding to the predetermined opening). The stable opening determined by the stable opening determining unit 93 is stored in the storage unit 92.

  The rest opening determination unit 94 determines the rest opening based on the stable opening determined by the stable opening determination unit 93. Specifically, the rest opening determination unit 94 determines a value (A + α) obtained by adding the correction amount α to the pulse amount A of the stable opening as the pulse amount of the rest opening. In this way, the pause opening degree determination unit 94 determines the pause opening degree. The rest opening determined by the rest opening determining unit 94 is stored in the storage unit 92. Note that the difference between the stable opening and the rest opening, that is, the correction amount α from the stable opening is determined based on a value obtained in advance through experiments or the like and stored in the storage unit 92. Further, in the present embodiment, the correction amount α is determined so that the ratio of water is larger than the mixing ratio of the mixed water and hot water at the stable opening. For this reason, for example, when the opening degree of the hot water mixing valve 54 is adjusted to the rest opening degree, the water in the mixed water is more than when the opening degree of the hot water mixing valve 54 is adjusted to the stable opening degree. The proportion increases.

  Here, in the present embodiment, the correction amount α is determined so that the ratio of water is larger than the mixing ratio of the water of the mixed water and the warm water at the stable opening, but the present invention is not limited to this, and the stable opening is not limited thereto. The correction amount α may be determined so that the ratio of the hot water is larger than the mixing ratio of the water of the mixed water and the warm water.

  Furthermore, when the supply of mixed water to the supply unit 16 stops, the opening degree adjustment unit 91 determines that the supply is suspended. Specifically, the opening degree adjusting unit 91 transmits information related to detection of a water amount larger than a predetermined amount (for example, 0 ml) from the hot water supply amount sensor FLS1, and then the predetermined amount (for example, 0 ml) or less from the hot water supply amount sensor FLS1. It is determined that the supply is suspended by transmitting information related to water volume detection. And when the opening degree adjustment part 91 judges that it is a supply stop state, it adjusts the opening degree of the hot water supply mixing valve 54 so that it may become a stop opening degree from a predetermined opening degree.

  In addition, when the supply of mixed water to the supply unit 16 is stopped for a predetermined time (for example, 30 minutes) or longer, that is, the opening degree adjusting unit 91 is a predetermined amount (for example, 0 ml) or less from the hot water supply amount sensor FLS1. When a predetermined time has elapsed since the transmission of the information related to detection, it is determined that the supply is stopped, and the opening of the hot water mixing valve 54 is set so that the opening of the hot water mixing valve 54 becomes the initial opening. adjust. Here, the initial opening in the present embodiment is the opening of the hot water supply mixing valve 54 at which the mixing ratio of water in the mixed water is 100%, that is, the hot water supply mixing valve at which the mixing ratio of hot water in the mixed water is 0%. It is an opening of 54. Moreover, in this embodiment, although the initial opening is set as mentioned above, the mixing ratio of the water of mixed water and warm water in an initial opening is not limited to this. Further, the initial opening degree is stored in the storage unit 92 in advance.

(5) Control Operation of Hot Water Mixing Valve by Opening Control Unit Next, the control operation of the hot water mixing valve 54 by the opening adjusting unit 91 will be described with reference to FIG. In the following description, when the opening degree of the hot water mixing valve 54 is adjusted to the initial opening degree, that is, when the opening degree adjusting unit 91 determines that the supply is stopped, the hot water mixing by the opening degree adjusting unit 91 is performed. The control content of the valve 54 is demonstrated.

  When it is determined that the supply has started, the opening adjustment unit 91 performs stable opening adjustment control (steps S1 and S2). Thereby, the opening degree of the hot water supply mixing valve 54 is adjusted from the initial opening degree to a predetermined opening degree. In addition, the stable opening determination unit 93 determines the stable opening while the stable opening adjustment control is being executed (step S3). Further, the stable opening determined by the stable opening determining unit 93 is stored in the storage unit 92 (step S3). Moreover, the rest opening degree determination part 94 determines a rest opening degree based on the stable opening degree determined by the stable opening degree determination part 93 (step S3). Then, the rest opening degree determined by the rest opening degree determination unit 94 is stored in the storage unit 92 (step S3).

  Next, when the opening degree adjustment unit 91 determines that the supply is suspended, the opening degree adjustment unit 91 adjusts the opening degree of the hot water supply mixing valve 54 from the predetermined opening degree to the pause opening degree stored in the storage unit 92. (Step S4, Step S5).

  When the opening adjustment unit 91 determines that the supply of mixed water to the supply unit 16 has been resumed before determining that the supply is stopped, immediately after the determination, the opening adjustment unit 91 increases the opening of the hot water supply mixing valve 54. Then, the rest opening is adjusted to the stable opening stored in the storage unit 92 (step S6, step S7). Thereafter, the opening degree adjusting unit 91 performs stable opening degree adjustment control again, and further adjusts the opening degree of the hot water supply mixing valve 54 from the stable opening degree stored in the storage unit 92 (step S2). Further, the stable opening degree determination unit 93 determines a new stable opening degree while the current stable opening degree adjustment control is being executed, and the new stable opening degree determined by the stable opening degree determination unit 93 is determined. The stable opening is stored in the storage unit 92 (step S3). Moreover, the rest opening degree determination part 94 determines a new rest opening degree based on the new stable opening degree determined by the stable opening degree determination part 93 (step S3). The new rest opening determined by the rest opening determination unit 94 is stored in the storage unit 92 as the rest opening (step S3).

  If the opening adjustment unit 91 determines that the supply is stopped in step S6, the opening adjustment unit 91 adjusts the opening of the hot water supply mixing valve 54 from the pause opening to the initial opening (step S8).

  Note that the processing from step S2 to step S7 is repeated until it is determined in step S6 that the supply is stopped.

(6) Features (6-1)
Conventionally, there is a hot water storage type hot water supply apparatus that supplies mixed water obtained by mixing water flowing through a first water supply pipe and hot water (hot water) flowing through a first hot water discharge pipe to a supply unit such as a faucet. In such a hot water storage type hot water supply apparatus, when the hot water supply mixing valve is adjusted so that the stable opening is maintained from when the supply of mixed water is suspended until it is restarted, Even if the opening degree of the hot water supply mixing valve is a stable opening degree, the temperature of the mixed water supplied to the supply unit immediately after the resumption of supply may be higher or lower than the set temperature (see FIG. 4).

  Therefore, as a result of intensive studies, the present inventor has tried to maintain a rest opening degree in which the ratio of water or hot water is larger than the mixing ratio of water and hot water at the time of stable opening degree while the mixed water supply is stopped. When adjusting the hot water supply mixing valve and adjusting the hot water supply mixing valve to a stable opening when restarting the supply of mixed water, make sure that the temperature of the mixed water supplied to the supply section approaches the set temperature immediately after restarting the supply. (See FIG. 5).

  In this embodiment, when it is determined that the supply is stopped, the opening degree of the hot water supply mixing valve 54 is adjusted from the predetermined opening degree so as to be the stopping opening degree stored in the storage unit 92. . When it is determined that the supply of mixed water to the supply unit 16 has been resumed, the opening degree of the hot water supply mixing valve 54 is adjusted from the pause opening degree to the stable opening degree stored in the storage unit 92. For this reason, the possibility that the mixed water having a temperature different from the set temperature is supplied to the supply unit 16 immediately after the supply of the mixed water to the supply unit 16 is restarted can be reduced.

  As a result, the risk of discomfort to the user can be reduced.

(6-2)
In the present embodiment, the opening degree adjustment unit 91 determines that the supply to the supply unit 16 is started by transmitting information related to water amount detection greater than a predetermined amount from the hot water supply water amount sensor FLS1, and sets the temperature and setting of the mixed water. Execution of the stable opening degree adjustment control for adjusting the opening degree of the hot water supply mixing valve 54 so that the temperature becomes equal is started. Moreover, the stable opening degree determination unit 93 is the opening degree of the hot water supply mixing valve 54 when the stable opening degree adjustment control is being performed, and the temperature of the mixed water based on the detection result of the hot water supply thermistor T9 and the set temperature. The opening when the state where the difference is within a predetermined range (for example, ± 0.5 ° C.) continues for a predetermined time (for example, 2 seconds) or more is determined as the stable opening. For this reason, for example, compared with the case where the stable opening degree is determined to be an opening degree unrelated to the set temperature, the difference between the temperature of the mixed water supplied from the supply unit 16 after the supply restart and the set temperature is reduced. Is able to.

(6-3)
In the present embodiment, after the opening degree adjusting unit 91 determines that the supply is suspended, the supply to the supply unit 16 is resumed by transmitting information related to water amount detection greater than a predetermined amount from the hot water supply water amount sensor FLS1. Judging. When the opening adjustment unit 91 determines that the supply of the mixed water to the supply unit 16 has been resumed, immediately after the determination, the opening adjustment unit 91 stores the opening of the hot water supply mixing valve 54 from the pause opening degree in the storage unit 92. Adjust to the stable opening. As described above, when it is determined that the supply has been resumed, the opening degree of the hot water supply mixing valve 54 is immediately adjusted to a stable opening degree, so that the temperature of the mixed water supplied from the supply unit 16 after the supply is resumed and the set temperature It is possible to make it difficult to produce a difference. Thereby, generation | occurrence | production of the undershoot after hot water supply restarts can be prevented.

(6-4)
In the present embodiment, the difference between the stable opening and the rest opening, that is, the correction amount α from the stable opening is determined based on a value obtained in advance through experiments or the like. For this reason, a certain difference can be provided between the stable opening and the rest opening. Since the difference between the stable opening and the rest opening is constant, the rest opening can be changed according to the stable opening. As a result, it is possible to determine a rest opening corresponding to a stable opening that varies depending on the temperature of different water or hot water every day.

  Here, in a hot water storage type hot water supply apparatus that supplies mixed water, which is a mixture of water flowing through the first water supply pipe and hot water flowing through the first hot water discharge pipe, to a supply section such as a faucet, the supply of mixed water to the supply section is suspended. When a stable opening is maintained as the opening of the hot water supply mixing valve from when it is restarted, mixed water with a temperature higher than the set temperature is supplied when restarting the supply of mixed water to the supply unit Often.

  Therefore, in the present embodiment, the correction amount α is determined so that the ratio of water is larger than the mixing ratio of the mixed water and warm water at the stable opening. For this reason, when the opening degree of the hot water supply mixing valve 54 is adjusted to the rest opening degree, the mixed water and hot water are mixed when the opening degree of the hot water mixing valve 54 is adjusted to the stable opening degree. The proportion of water is greater than the proportion. Therefore, in this hot water storage type hot water supply apparatus, when the supply of the mixed water to the supply unit 16 is resumed, the possibility that the mixed water having a temperature higher than the set temperature is supplied can be reduced.

(7) Modification (7-1) Modification 1A
In the above embodiment, the stable opening determined by the stable opening determining unit 93 is stored in the storage unit 92. Instead of this, the stable opening may not be stored. Further, when the stable opening is not stored, the opening adjustment unit 91 determines that the supply of the mixed water to the supply unit 16 has been resumed, so that the opening of the hot water supply mixing valve 54 becomes the pause opening. To the initial opening degree.

(7-2) Modification 1B
In the embodiment described above, the correction amount α is determined based on a value obtained in advance through experiments or the like, and is stored in the storage unit 92. In addition to this, the correction amount α may be corrected locally.

(7-3) Modification 1C
In the above-described embodiment, when the supply restart is detected, the opening degree of the hot water supply mixing valve 54 is immediately adjusted from the rest opening degree to the stable opening degree.

  Alternatively, the opening degree of the hot water supply mixing valve may be gradually adjusted from the rest opening degree to the stable opening degree by feedback control after the supply restart is detected. In such a case, the correction amount may be smaller than the correction amount α in the above embodiment.

(7-4) Modification 1D
In the above embodiment, the rest opening is determined regardless of the amount of mixed water flowing through the first supply pipe 53a, various operation modes (operation details), the set temperature, and the like. Instead, the rest opening degree may be determined in consideration of the amount of mixed water flowing through the first supply pipe 53a, various operation modes, the set temperature, and the like.

Second Embodiment
The hot water storage type hot water supply apparatus according to the second embodiment of the present invention will be described below. In the hot water storage type hot water supply apparatus according to the present embodiment, (2) the configuration of the heat pump unit and (3) the configuration of the hot water storage unit are the same as those in the first embodiment. ) Only the configuration of the control device and (5) the control operation of the hot water mixing valve by the opening control unit will be described, and the description of (1) to (3) will be omitted.

(4) Configuration of Control Device The control device 190 is based on the detection results of the thermistors T1 to T10, the water volume sensors FLS1, FLS2, and the like, and the valves 54, 55, 59, SV, the heat pump unit 83, and the pumps P1, P2. , P3 and other various devices are controlled. The control device 190 is connected to a controller 185 as shown in FIG. The controller 185 receives user operations. For example, the controller 185 includes a setting unit 186 that can set the temperature of hot water supplied from the supply unit 16. The setting unit 186 transmits information regarding the set temperature set by the user to the control device 190. The control device 190 includes an opening degree adjusting unit 191 and a storage unit 192. Hereinafter, for convenience of explanation, hot water supplied from the supply unit 16 through the first supply pipe 53a is referred to as mixed water.

  The opening degree adjustment unit 191 adjusts the opening degree of the hot water supply mixing valve 54 in order to change the mixing ratio of the water mixed in the hot water supply mixing valve 54 and the hot water. Further, the opening degree adjustment unit 191 adjusts the opening degree of the hot water mixing valve 54 based on the set temperature set by the user operating the setting unit 186, the detection results of the hot water supply thermistor T9, and the hot water amount sensor FLS1. Stable opening adjustment control is performed. Specifically, in the stable opening degree adjustment control, the opening degree adjustment unit 191 uses the temperature of the mixed water based on the information about the temperature of the mixed water flowing through the first supply pipe 53a transmitted from the hot water supply thermistor T9, and the setting unit 186. The opening degree of the hot water supply mixing valve 54 is adjusted so that the set temperature based on the information related to the set temperature transmitted from is equal. The stable opening degree adjustment control is control performed when the mixed water is supplied to the supply unit 16, and the opening degree adjustment unit 191 is information related to detection of a water amount greater than a predetermined amount (for example, 0 ml) from the hot water supply amount sensor FLS1. Is transmitted, it is determined that the supply to the supply unit 16 is started, and the stable opening adjustment control is started. Further, the opening degree adjustment unit 191 determines whether or not the supply of mixed water to the supply unit 16 has been resumed. Specifically, after determining that the opening degree adjusting unit 191 is in a supply halt state described later, and before determining that it is in a hot water supply stop state described later, the information related to detection of a water amount greater than a predetermined amount from the hot water supply water amount sensor FLS1. Is transmitted, it is determined that the supply of the mixed water to the supply unit 16 has been resumed. Further, the opening degree adjusting unit 191 determines that it is in a hot water supply stop state, which will be described later, after determining that it is in a supply pause state, which will be described later, and before information related to water amount detection greater than a predetermined amount is transmitted from the hot water supply amount sensor FLS1. In such a case, it is determined that the supply of mixed water to the supply unit 16 has not been resumed. In the following, for convenience of explanation, the opening during the stable opening adjustment control is referred to as a predetermined opening.

  Further, when the supply of mixed water to the supply unit 16 is stopped, the opening degree adjustment unit 191 determines that the supply is suspended. Specifically, the opening degree adjusting unit 191 transmits information related to detection of a larger amount of water than a predetermined amount (for example, 0 ml) from the hot water supply amount sensor FLS1, and then the predetermined amount (for example, 0 ml) or less from the hot water supply amount sensor FLS1. It is determined that the supply is suspended by transmitting information related to water volume detection. When the opening degree adjustment unit 191 determines that the supply is in a suspended state, the opening degree adjustment unit 191 adjusts the opening degree of the hot water supply mixing valve 54 so that the predetermined opening degree becomes a later-described pause opening degree.

  In addition, the opening degree adjustment part 191 is the amount of water below a predetermined amount (for example, 0 ml) from the hot water supply amount sensor FLS1 when the supply of the mixed water to the supply unit 16 is stopped for a predetermined time (for example, 30 minutes) or longer. When a predetermined time has elapsed since the transmission of the information related to detection, it is determined that the supply is stopped, and the opening of the hot water mixing valve 54 is set so that the opening of the hot water mixing valve 54 becomes the initial opening. adjust. Here, the initial opening in the present embodiment is the opening of the hot water supply mixing valve 54 at which the mixing ratio of water in the mixed water is 100%, that is, the hot water supply mixing valve at which the mixing ratio of hot water in the mixed water is 0%. It is an opening of 54. Moreover, in this embodiment, although the initial opening is set as mentioned above, the mixing ratio of the water of mixed water and warm water in an initial opening is not limited to this. The initial opening degree is stored in the storage unit 192 in advance.

  In the present embodiment, it is assumed that the opening degree of the hot water supply mixing valve 54 is stored in the storage unit 192 as a pulse amount. In addition, the opening degree adjusting unit 191 includes a stable opening degree determining unit 193 and a pause opening degree determining unit 194.

  The stable opening degree determining unit 193 is the opening degree of the hot water supply mixing valve 54 when the stable opening degree adjustment control is performed, and is set by the user and the temperature of the mixed water based on the detection result of the hot water supply thermistor T9. The opening when the state where the difference from the set temperature is within a predetermined range (for example, ± 0.5 ° C.) continues for a predetermined time (for example, 2 seconds) or longer is the stable opening (corresponding to the predetermined opening) To decide. The stable opening determined by the stable opening determining unit 193 is stored in the storage unit 192.

  The pause opening degree determination unit 194 performs pause opening degree determination control that determines the pause opening degree according to the temperature change of the mixed water after the supply of the mixed water to the supply unit 16 is resumed. In addition, the pause opening degree determination unit 194 includes a monitoring unit 195. The monitoring unit 195 monitors the temperature change of the mixed water after the supply of the mixed water to the supply unit 16 is resumed. Specifically, the monitoring unit 195 immediately after the opening adjustment unit 191 determines that the supply of mixed water to the supply unit 16 has been resumed, immediately after the supply of mixed water to the supply unit 16 is resumed. The temperature change of the mixed water within a predetermined time (for example, 5 seconds) is monitored. The monitoring unit 195 monitors the temperature change of the mixed water based on the detection result transmitted from the hot water supply thermistor T9. More specifically, the monitoring unit 195 includes a peak temperature (maximum temperature or minimum temperature) of the temperatures transmitted from the hot water supply thermistor T9 within a predetermined time immediately after the supply of the mixed water is resumed, a set temperature, Is specified as the temperature change value ΔT of the mixed water (see FIG. 4). For example, when the set temperature is “40” ° C. and the peak temperature is “43” ° C., the monitoring unit 195 specifies the temperature change value ΔT of the mixed water as “+3”.

  Here, FIG. 7 is a table showing a correspondence relationship between the temperature change value range of the mixed water and the correction amount, and this table is stored in the storage unit 192.

  The rest opening degree determination unit 194 grasps in which temperature change value range of the table shown in FIG. 7 the temperature change value ΔT specified by the monitoring unit 195 in the rest opening degree determination control, and the grasped temperature A correction amount corresponding to the change value range is selected and extracted. Then, the rest opening determination unit 194 determines the pulse amount of the rest opening as a value obtained by adding the correction amount α to the pulse amount of the stable opening stored in the storage unit 192. For example, when the temperature change value ΔT specified by the monitoring unit 195 is “+3”, the rest opening degree determination unit 194 enters the temperature change value range in which + 2 ≦ ΔT <+5. And “−50” is selected and extracted as the correction amount. Then, the rest opening determination unit 194 determines a pulse amount (A-50) obtained by adding “−50” as a correction amount to the pulse amount A of the stable opening as the pulse amount of the rest opening. In this way, the pause opening degree determination unit 194 determines the pause opening degree. The pause opening determined by the pause opening determining unit 194 is stored in the storage unit 192.

(5) Control Operation of Hot Water Mixing Valve by Opening Control Unit Next, the control operation of the hot water mixing valve 54 by the opening adjusting unit 191 will be described with reference to FIG. In the following, when the opening of the hot water supply mixing valve 54 is adjusted to the initial opening, that is, when the opening adjustment unit 191 determines that the supply is stopped, the hot water supply by the opening adjustment unit 191 is performed. The control content of the mixing valve 54 is described.

  When it is determined that the supply of mixed water to the supply unit 16 has been started, the opening adjustment unit 191 performs stable opening control (steps S21 and S22). Thereby, the opening degree of the hot water supply mixing valve 54 is adjusted from the initial opening degree to a predetermined opening degree. Moreover, the stable opening degree determination part 193 determines a stable opening degree during execution of the stable opening degree adjustment control (step S23). Further, the stable opening determined by the stable opening determining unit 193 is stored in the storage unit 192 as a pulse amount (step S23).

  Next, when the opening degree adjustment unit 191 determines that the supply is resumed after determining that the supply is stopped, and before determining that the supply is stopped, the opening adjustment unit 191 again performs the stable opening adjustment control. Perform (Step S24, Step S25, Step S26). Note that the opening degree of the hot water supply mixing valve 54 is maintained at a stable opening degree until it is determined that the supply is resumed in step S25 after it is determined in step S24 that the supply is stopped. Then, by performing the stable opening adjustment control again in step S26, the opening adjusting unit 191 adjusts the opening of the hot water supply mixing valve 54 from the stable opening stored in the storage unit 192 to a predetermined opening. . In addition, the stable opening determination unit 193 determines a new stable opening during the current stable opening adjustment control. Then, the new stable opening determined by the stable opening determining unit 193 is stored in the storage unit 192 as a stable opening with a pulse amount.

  Further, after the stable opening adjustment control is executed in step S26, a stable opening is newly determined by the stable opening determining unit 193, and the new stable opening is stored in the storage unit 192. By 194, rest opening determination control is performed (step S27). When the pause opening degree is determined by the pause opening degree determination unit 194, the determined pause opening degree is stored in the storage unit 192 as a pulse amount (step S28).

  And when the opening degree adjustment part 191 judges that it is a supply stop state, it adjusts the opening degree of the hot water supply mixing valve 54 from the predetermined opening degree to the pause opening degree memorize | stored in the memory | storage part 192 ( Step S29, Step S30).

  Thereafter, when the opening degree adjustment unit 191 determines that the supply is resumed before determining that the supply is stopped, the opening degree adjustment unit 191 stores the storage unit 192 from the pause opening degree immediately after determining that the supply is resumed. The opening degree of the hot water supply mixing valve 54 is adjusted to the stored stable opening degree (steps S31 and S32). After that, the opening degree adjusting unit 191 performs stable opening degree adjustment control again (step S33).

  If the opening adjustment unit 191 determines in step S25 or step S31 that the supply has been stopped before determining that the supply has been resumed, the opening adjustment unit 191 pauses the opening of the hot water supply mixing valve 54. The opening is adjusted from the opening to the initial opening (step S34).

  Note that the processing from step S29 to step S32 is repeated until it is determined in step S31 that the supply is stopped.

(6) Features (6-1)
In the present embodiment, the pause opening degree determination unit 194 performs pause opening degree determination control that determines the pause opening degree according to the temperature change of the mixed water after the supply of the mixed water to the supply unit 16 is resumed. . When it is determined that the supply is stopped, the opening degree of the hot water supply mixing valve 54 is adjusted from the predetermined opening degree to the stop opening degree stored in the storage unit 192. When the supply of mixed water is resumed, the opening degree of the hot water supply mixing valve 54 is adjusted from the rest opening degree to the stable opening degree stored in the storage unit 192. For this reason, the possibility that the mixed water having a temperature different from the set temperature is supplied to the supply unit 16 immediately after the supply of the mixed water is restarted can be reduced.

(6-2)
In the present embodiment, the opening degree adjustment unit 191 determines that the supply of the mixed water to the supply unit 16 is started by transmitting information related to the detection of the water amount greater than the predetermined amount from the hot water supply amount sensor FLS1, and the mixed water Execution of the stable opening degree adjustment control for adjusting the opening degree of the hot water supply mixing valve 54 is started so that the temperature and the set temperature become equal. The stable opening degree determining unit 193 is the opening degree of the hot water supply mixing valve 54 when the stable opening degree adjustment control is performed, and is set by the temperature of the mixed water based on the detection result of the hot water supply thermistor T9 and the user. The opening when the state where the difference from the set temperature is within a predetermined range (for example, ± 0.5 ° C.) continues for a predetermined time (for example, 2 seconds) is determined as the stable opening. For this reason, for example, compared with the case where the stable opening is determined to be an opening unrelated to the set temperature, the difference between the temperature of the mixed water supplied from the supply unit 16 after the hot water supply is resumed and the set temperature is reduced. Is able to.

(6-3)
In the present embodiment, after the opening degree adjustment unit 191 determines that the supply is suspended, the information on water amount detection larger than a predetermined amount is transmitted from the hot water supply amount sensor FLS1, thereby supplying the mixed water to the supply unit 16. Has been resumed. When the opening adjustment unit 191 determines that the supply of mixed water to the supply unit 16 has been resumed, immediately after the determination, the opening degree of the hot water supply mixing valve 54 is stored in the storage unit 192 from the pause opening degree. Adjust to the stable opening. Thus, since the opening degree of the hot water supply mixing valve 54 is immediately adjusted to the stable opening degree when the supply restart is detected, the temperature of the mixed water supplied from the supply unit 16 after the supply restart and the set temperature It is difficult to make a difference between them. As a result, it is possible to prevent the occurrence of undershoot after the resumption of supply.

(6-4)
In the present embodiment, the pause opening degree determination unit 194 includes a monitoring unit 195 that monitors the temperature change of the mixed water after the supply of the mixed water to the supply unit 16 is resumed. In addition, the pause opening degree determination unit 194 grasps which temperature variation value range of the table stored in the storage unit 192 the temperature variation value ΔT specified by the monitoring unit 195 falls into, and grasps the grasped temperature variation. A correction amount corresponding to the value range is selected and extracted. Then, the rest opening determination unit 194 determines the pulse amount of the rest opening as a value obtained by adding the correction amount α to the pulse amount of the stable opening stored in the storage unit 192. Thus, in this hot water storage type hot water supply apparatus, the rest opening degree can be determined according to the temperature change of the supplied mixed water.

(7) Modification (7-1) Modification 2A
In the above embodiment, the pause adjustment by the pause opening degree determination unit 195 is performed after the opening degree adjustment unit 191 determines that the supply of the mixed water to the supply unit 16 is started until it is determined that the supply is stopped. The opening adjustment control is performed only once.

  Instead, the pause opening degree adjustment control is performed a plurality of times after the opening degree adjustment unit 191 determines that the supply of the mixed water to the supply unit 16 is started until it is determined that the supply is stopped. It may be done. In the following, a plurality of pause opening adjustment controls are performed between the time when the opening adjustment unit 191 determines that the supply of mixed water to the supply unit 16 is started and the time when it is determined that the supply is stopped. The case where it is performed once will be described.

  The pause opening degree determination unit 194 performs pause opening degree determination control that determines the pause opening degree according to the temperature change of the mixed water after the supply of the mixed water to the supply unit 16 is resumed. The rest opening determination control includes a first rest opening determination control and a second rest opening determination control.

  The first stop opening degree determination control is control that is performed when the stop opening degree is determined for the first time after the opening degree adjusting unit 191 determines that the supply is stopped. The second rest opening determination control is a control performed when the rest opening is determined after the first rest opening determination control is performed. Hereinafter, for convenience of explanation, the rest opening determined in the first rest opening determination control is referred to as the first rest opening, and the rest opening determined in the second rest opening determination control is the first rest opening. It is called 2 rest opening. In addition, the pause opening degree determination unit 194 includes a monitoring unit 195. Note that the function of the monitoring unit 195 is the same as that of the above embodiment, and a description thereof will be omitted here.

  The rest opening degree determination unit 194 grasps in which temperature change value range of the table shown in FIG. 7 the temperature change value ΔT specified by the monitoring unit 195 in the rest opening degree determination control, and the grasped temperature A correction amount corresponding to the change value range is selected and extracted. Then, the pause opening degree determination unit 194 sets the pulse amount of the pause opening degree as the pulse amount A of the stable opening stored in the storage unit 192 or the pulse amount B of the pause opening stored in the storage unit 192, A value obtained by adding a correction amount α to C is determined.

  For example, when the first rest opening degree determination control is performed by the rest opening degree determination unit 194 and the temperature change value ΔT specified by the monitoring unit 195 is “+3”, the rest opening degree determination unit 194 grasps that the temperature change value ΔT falls within the temperature change value range of + 2 ≦ ΔT <+5, and selects and extracts “−50” as the correction amount. Then, the rest opening determination unit 194 determines a pulse amount (A-50) obtained by adding “−50” as a correction amount to the pulse amount A of the stable opening as the pulse amount B of the first rest opening. .

  Further, for example, when the second rest opening determination control is performed by the rest opening determination unit 194 and the temperature change value ΔT specified by the monitoring unit 195 is “+3”, the rest opening is determined. The degree determination unit 194 grasps that the temperature change value ΔT falls within the temperature change value range of + 2 ≦ ΔT <+5, and selects and extracts “−50” as the correction amount. Then, the pause opening degree determination unit 194 adds a pulse amount (B-50) obtained by adding “−50” as a correction amount to the pulse amount B of the first pause opening degree which is the pause opening degree stored in the storage unit 192. ) Is determined as the pulse amount C of the second rest opening. In addition, when performing the second pause opening degree determination control after the second time, the pause opening degree determination unit 194 calculates a pulse amount (C + α) obtained by adding the correction amount α to the pulse amount C of the second pause opening degree. A new pulse amount C of the second rest opening is determined.

  Next, the control operation of the hot water supply mixing valve 54 by the opening degree adjusting unit 191 will be described with reference to FIG. In the following, when the opening of the hot water supply mixing valve 54 is adjusted to the initial opening, that is, when the opening adjustment unit 191 determines that the supply is stopped, the hot water supply by the opening adjustment unit 191 is performed. The control content of the mixing valve 54 is described.

  When it is determined that the supply of mixed water to the supply unit 16 is started, the opening adjustment unit 191 performs stable opening control (steps S51 and S52). Thereby, the opening degree of the hot water supply mixing valve 54 is adjusted from the initial opening degree to a predetermined opening degree. Moreover, the stable opening degree determination part 193 determines a stable opening degree during execution of the stable opening degree adjustment control (step S53). Further, the stable opening determined by the stable opening determining unit 193 is stored in the storage unit 192 as a pulse amount (step S53).

  Next, the opening degree adjustment unit 191 determines that the supply of mixed water to the supply unit 16 has been resumed after determining that the supply is suspended after determining that the supply is suspended. Again, stable opening adjustment control is performed (step S54, step S55, step S56). Note that the opening degree of the hot water supply mixing valve 54 is maintained at a stable opening degree until it is determined in step S55 that the supply has been resumed after it is determined in step S54 that the supply is stopped. Then, by performing the stable opening adjustment control again in step S56, the opening adjustment unit 191 adjusts the stable opening stored in the storage unit 192 to a predetermined opening. In addition, the stable opening determination unit 193 determines a new stable opening during the current stable opening adjustment control. Then, the new stable opening determined by the stable opening determining unit 193 is stored in the storage unit 192 as a stable opening with a pulse amount.

  Further, after the stable opening degree adjustment control is executed in step S56 and the stable opening degree is newly determined by the stable opening degree determining unit 193, the first opening degree determining control is performed by the rest opening degree determining unit 194. (Step S57). When the first pause opening degree is determined by the pause opening degree determination unit 194, the determined first pause opening degree is stored in the storage unit 192 as a pulse amount.

  Thereafter, when the opening degree adjustment unit 191 determines that the supply is in a suspended state, the opening degree of the hot water supply mixing valve 54 is adjusted from the predetermined opening degree to the first pause opening degree stored in the storage unit 192. (Step S58, Step S59).

  If the opening degree adjusting unit 191 determines that the supply of the mixed water has been resumed before determining that the supply is stopped, the opening degree adjusting unit 191 immediately after determining that the supply of the mixed water has been resumed. Then, the opening degree of the hot water supply mixing valve 54 is adjusted to the stable opening degree stored in the storage unit 192 (step S60). After that, the opening degree adjusting unit 191 performs stable opening degree adjustment control again (step S61). Further, when the stable opening adjustment control is executed in step S61 and the new stable opening is determined by the stable opening determining unit 193, the new stable opening is stored in the storage unit 192 as a pulse amount. Thereafter, the second stop opening degree determination control is performed by the stop opening degree determination unit 194 (step S62). In step S62, when the second pause opening degree determination control is executed and the second pause opening degree is determined by the pause opening degree determination unit 194, the determined second pause opening degree is stored in the storage unit 192 as a pulse amount. Remembered.

  Thereafter, when the opening degree adjustment unit 191 determines that the supply is in a suspended state, the opening degree of the hot water supply mixing valve 54 is adjusted from the predetermined opening degree to the second pause opening degree stored in the storage unit 192. (Step S63, Step S64). When the opening adjustment unit 191 determines that the supply of the mixed water has been resumed before determining that the supply is stopped, the opening adjustment unit 191 immediately after determining that the supply of the mixed water has been resumed. Therefore, the opening degree of the hot water supply mixing valve 54 is adjusted to the stable opening degree newly stored in the storage unit 192, and thereafter, the stable opening degree adjustment control is performed (step S60, step S61).

  In addition, when the opening degree adjustment unit 191 determines in step S55 or step S60 that the supply of mixed water to the supply unit 16 has been resumed before determining that the supply is stopped, hot water mixing is performed. The opening degree of the valve 54 is adjusted from the rest opening degree to the initial opening degree (step S65).

  Note that the processing from step S60 to step S64 is repeated until it is determined in step S60 that the supply is stopped.

  Thus, in this hot water storage type hot water supply apparatus, the supply of mixed water is between the time when the supply of mixed water is determined by the opening degree adjusting unit 191 and the time when it is determined that the supply is stopped. Each time the operation is resumed, the rest opening degree is determined by the rest opening degree determination unit 194, so that the mixed water having a temperature different from the set temperature may be supplied to the supply unit 16 immediately after the supply of the mixed water is resumed. Can be reduced.

(7-2) Modification 2B
In the above embodiment, the rest opening determination unit 194 determines the pulse amount of the rest opening as a value obtained by adding the correction amount α to the pulse amount of the stable opening stored in the storage unit 192.

  Instead, the pause opening degree determination unit may determine the pulse amount of the pause opening degree to a value obtained by adding the correction amount α to the pulse amount of the initial opening degree stored in the storage unit.

(7-3) Modification 2C
In the above embodiment, the table indicating the correspondence relationship between the temperature change value range of the mixed water and the correction amount is stored in the storage unit 192. In addition to this, the correction amount α may be corrected locally.

(7-4) Modification 2D
In the above embodiment, when the restart of the supply of mixed water to the supply unit 16 is detected, the opening degree of the hot water supply mixing valve 54 is immediately adjusted from the first rest opening degree or the second rest opening degree to the stable opening degree. ing.

  Instead, after the restart of the supply of the mixed water to the supply unit 16 is detected, the opening degree of the hot water mixing valve is gradually and stably opened from the first rest opening degree or the second rest opening degree by feedback control. You may adjust it every time. In such a case, the correction amount may be smaller than the correction amount α in the above embodiment.

(7-5) Modification 2E
In the above embodiment, the correction amount α is determined irrespective of the amount of mixed water flowing through the first supply pipe 53a, various operation modes (operation details), the set temperature, and the like. Instead of this, the correction amount α may be determined in consideration of the amount of mixed water flowing through the first supply pipe 53a, various operation modes, a set temperature, and the like.

  [Technical Field] The present invention is an invention of a hot water supply apparatus that can reduce the possibility of causing discomfort to the user, and supplies hot water supply apparatus that supplies mixed water, which is a mixture of water flowing through a water supply pipe and hot water flowing through a hot water supply pipe, to a supply unit Application to is effective.

1 Hot water storage type hot water supply device (hot water supply device)
51a 1st water supply pipe (water supply pipe)
52a First tap pipe (hot water pipe)
53a First supply pipe (supply pipe)
54 Hot water mixing valve (mixing valve)
90 Control device (control unit)
195 monitoring unit 86,186 setting unit 91,191 opening adjustment unit (determination unit)

JP 2006-125773 A

Claims (4)

A water supply pipe (51a) through which water flows;
A hot water supply pipe (52a) through which hot water having a temperature higher than water flowing through the water supply pipe flows;
The water supply pipe and the hot water supply pipe are connected, and a mixing valve (54) for mixing water flowing through the water supply pipe and hot water flowing through the hot water supply pipe;
A supply pipe (53a) connected to the mixing valve for flowing mixed water composed of water and hot water mixed in the mixing valve to a supply unit;
Monitoring the supply of mixed water to the feed section determination unit for determining whether it is resumed with the (1 91), monitoring the temperature change of the mixed water after the supply of the mixed water into the supply unit is restarted part (195) and has, by adjusting the opening degree of the mixing valve, the control unit for changing the mixing ratio of water and hot water are mixed in the mixing valve (1 90),
With
The controller is
When the supply of mixed water to the supply unit is suspended, mixing of the mixed water and hot water at the predetermined opening from a predetermined opening before the supply of mixed water to the supply unit is suspended The opening of the mixing valve is adjusted so that the opening is larger than the ratio or the ratio of water or hot water and is determined to be a rest opening based on the monitoring result of the monitoring unit ,
When the determination unit determines that the supply of mixed water to the supply unit has been resumed, the opening degree of the mixing valve is immediately adjusted so that the predetermined opening degree is reached from the rest opening degree.
Hot water supply device (1). The setting unit capable of setting a temperature of the mixed water supplied from the supply unit (1 86),
A detector (T9) capable of detecting the temperature of the mixed water flowing through the supply pipe;
Further comprising
The control unit is an opening when the mixed water is supplied to the supply unit, and a difference between a temperature of the mixed water detected by the detection unit and a set temperature set by the setting unit is within a predetermined range. an opening degree of the mixing valve when the a is determined to the predetermined opening degree,
The hot water supply apparatus according to claim 1. Wherein, wherein when the temperature changes in the the mixed water monitored by the monitoring unit is a change to the high temperature side, the proportion of water than the mixing ratio of the mixed water of the water and the hot water at the predetermined opening degree Determine the rest opening so as to increase,
The hot-water supply apparatus of Claim 1 or 2 . Wherein, wherein when the temperature changes in the the mixed water monitored by the monitoring unit is a change to the low temperature side, the proportion of hot water than the mixing ratio of the mixed water of the water and the hot water at the predetermined opening degree Determine the rest opening so as to increase,
The hot-water supply apparatus of any one of Claim 1 to 3 .

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