JP2012042091A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater which can prevent supply of hot water set high exceeding a general hot water supply set temperature during general hot water supply when the set temperature of bath hot water is higher than the set temperature of the general hot water supply.SOLUTION: In the water heater 1 serving as a heat exchanger where heat exchanger 50 for hot water supply is used for both general hot water supply and bath hot water supply, a controller 100 controls a hot water supply circulation pump 44 so that a hot water temperature after heat exchange at the hot water supplying heat exchanger 50 becomes a temperature corresponding to a general hot water supply set temperature, when it detects general hot water supply during bath hot water supply, in a case when the bath hot water set temperature is higher than the general hot water supplying set temperature, and controls the opening degree of a flow regulating valve 32 in a close direction when both of the bath hot water supply and the general hot water supply are simultaneously carried out.

Description

  The present invention relates to a heat storage tank type water heater.

  Conventionally, as a water heater that does not use hot water in the hot water storage tank for hot water supply, hot water and hot water in the hot water storage tank are heat-exchanged with a heat exchanger for hot water supply to make hot water, and hot water supply and hot water can be supplied with a hot water mixing valve The technique to make is proposed (refer patent document 1). Incidentally, the hot water beam in the water heater disclosed in Patent Document 1 is implemented by opening and closing a hot water solenoid valve, and the hot water is implemented by adjusting the temperature with a hot water mixing valve.

JP 2010-91196 A (FIG. 1)

  However, in the water heater described in Patent Document 1, when the set temperature of the bathtub hot water (hot water, etc.) is higher than the set temperature of the general hot water (faucet, etc.), When started, hot water having a temperature higher than the general hot water supply set temperature is discharged, and the user may feel uncomfortable or dissatisfied.

  Therefore, the present invention provides a water heater in which hot water deviating from the general hot water set temperature is not discharged when the hot water set temperature is higher than the set temperature of the general hot water. The task is to do.

  The first invention includes a heat storage tank for storing a heat medium, heating means for heating the heat medium in the heat storage tank, a general hot water supply circuit for supplying hot water to a general hot water supply terminal, and a bathtub hot water supply circuit for supplying hot water to a bathtub A hot water supply heating circuit that takes out the heat medium stored in the heat storage tank and returns it to the heat storage tank, and is provided in the hot water supply heating circuit, and is supplied to the hot water supplied to the general hot water supply terminal and the bathtub A hot water supply heat exchanger that heats hot water by exchanging heat with the heat medium, and a hot water supply that is provided in the hot water heating circuit and circulates the heat medium between the heat storage tank and the hot water heat exchanger. A circulation pump, and a controller for controlling the heating circuit and the hot water supply circulation pump, and the hot water supply heat exchanger is common for general hot water supply and for hot water supply for bathtubs. Bath water supply circuit When a valve is arranged in the bathtub hot water supply circuit downstream from the branch, and the control unit detects the general hot water supply during bath hot water when the bathtub hot water set temperature is higher than the general hot water set temperature, the heat for hot water supply is detected. The hot water circulation pump is controlled so that the hot water temperature after heat exchange by the exchanger becomes a temperature corresponding to the set temperature of the general hot water supply, and the valve is controlled in the closing direction while simultaneously performing the hot water supply for the bathtub and the general hot water supply. It is characterized by doing.

  2nd invention is the heat storage tank which stores a heat medium, the heating means which heats the heat medium in the said heat storage tank, the general hot water supply circuit which supplies hot water to a general hot water supply terminal, and the bathtub hot water supply circuit which supplies hot water to a bathtub A hot water supply heating circuit that takes out the heat medium stored in the heat storage tank and returns it to the heat storage tank, and is provided in the hot water supply heating circuit, and is supplied to the hot water supplied to the general hot water supply terminal and the bathtub A hot water supply heat exchanger that heats hot water by exchanging heat with the heat medium, and a hot water supply that is provided in the hot water heating circuit and circulates the heat medium between the heat storage tank and the hot water heat exchanger. A circulation pump, and a controller for controlling the heating circuit and the hot water supply circulation pump, and the hot water supply heat exchanger is common for general hot water supply and for hot water supply for bathtubs. Bath water supply circuit When the valve is arranged in the bathtub hot water supply circuit downstream from the branch, and the bathtub hot water set temperature is higher than the general hot water set temperature, the control unit sets a predetermined bath hot water amount or a predetermined bath hot water time. The hot water supply circulation pump is controlled so as to reach a temperature corresponding to a general hot water supply set temperature prior to the end of the tub hot water supply.

  According to the present invention, there is provided a water heater in which hot water deviating from the general hot water set temperature is not discharged even when the set temperature of the bath hot water is higher than the set temperature of the general hot water. it can.

1 is an overall circuit diagram of a water heater according to a first embodiment. In the hot water supply machine which concerns on 1st Embodiment, it is a flowchart which shows control when general hot water supply is detected during bathtub hot water supply. It is a time chart which shows the operation example corresponding to the flowchart of FIG. It is a flowchart which shows control when the general hot water supply is detected in the hot water supply machine which concerns on the modification of 1st Embodiment during bathtub hot water supply. It is a time chart which shows the operation example corresponding to the flowchart of FIG. In the water heater concerning a 2nd embodiment, it is a flowchart which shows control when general hot water supply is detected during bathtub hot water supply. It is a time chart which shows the operation example corresponding to the flowchart of FIG.

(First embodiment)
Hereinafter, the water heater 1 according to the first embodiment will be described with reference to FIGS. 1 to 3.
As shown in FIG. 1, a water heater 1 according to the first embodiment includes a heat storage tank unit 2 and a heat pump unit (heating means) 3.

  The heat storage tank unit 2 includes a heat storage tank 10, a general hot water supply circuit 20, a bathtub hot water supply circuit 30, a hot water supply heating circuit 40, a hot water supply heat exchanger 50, a controller 100, and the like.

  Although not shown, for example, the heat pump unit 3 compresses a refrigerant (for example, carbon dioxide) to a high temperature and a high pressure, condenses the refrigerant from the compressor, and exchanges heat from water from the heat storage tank 10. The condenser is configured to be heated, the expansion valve that expands the refrigerant from the condenser, and the evaporator that absorbs heat in the atmosphere and evaporates the expanded refrigerant.

  The heat pump unit 3 has a heat medium inlet connected to the lower part of the heat storage tank 10 via the heat pump forward pipe 4, and a heat medium outlet connected to the upper part of the heat storage tank 10 via the heat pump return pipe 5. Although not shown, a circulation pump for circulating the heat medium in the heat storage tank 10 is provided between the heat storage tank 10 and the heat pump unit 3 on the heat storage tank unit 2 side or the heat pump unit 3 side.

  Note that the heat pump unit 3 has been described as an example of the heat source unit for heating the hot water in the heat storage tank 10, but the heat pump unit 3 is not limited thereto, and may be an electric heater, for example.

  The heat storage tank 10 is, for example, a sealed tank that stores hot water as a heat medium, and has a vertically long cylindrical shape. Further, the heat storage tank 10 is covered with a heat insulating material such as foamed polystyrene in order to improve heat retention performance. Note that the heat storage tank 10 is not limited to a closed type, and may be an open type.

  The heat storage tank 10 is provided with a plurality of tank temperature sensors 11 to 15 that detect the temperature of the heat medium (hot water) at different height positions. Specifically, the tank 10 is provided with five tank temperature sensors 11 to 15 from the upper part to the lower part. Thereby, the controller 100 can grasp the temperature distribution of the hot water in the heat storage tank 10.

  In the present embodiment, water (such as tap water) is used as the heat medium. However, since the heat medium in the present embodiment is not supplied to the outside of the heat storage tank 10, it may be other than water, for example, a liquid containing a latent heat storage material or an antifreeze liquid.

  The general hot water supply circuit 20 is a flow path for supplying hot water to a general hot water supply terminal (not shown) used for general hot water supply, and includes a water supply pipe 21 and a general hot water supply pipe 22. Note that the general hot water supply is a usage form in which the supplied hot water is used once and completed. Examples of the general hot water supply terminal used for the general hot water supply include a faucet and a shower installed in a kitchen, a washroom, a bathroom, and the like.

  The water supply pipe 21 has an upstream end connected to a water supply source and a downstream end connected to a secondary water supply inlet 51a of a hot water heat exchanger 50 described later. The water supply pipe 21 is provided with a water supply temperature sensor 25 for measuring the temperature of the water supply.

  The feed water temperature sensor 25 detects the temperature of the feed water before being introduced into the hot water supply heat exchanger 50 described later.

  The general hot water supply pipe 22 (22a, 22b) has an upstream end connected to a secondary hot water outlet 51b of the hot water heat exchanger 50 and a downstream end connected to various general hot water terminals. The general hot water supply pipe 22 is provided with a hot water supply temperature sensor 26, a flow rate sensor 23, and an accumulator 24 in order from the upstream side. The description of the pipes 22a and 22b will be given later.

  In addition, as a water supply source to which the water supply pipe 21 is connected, it is not limited to a water supply, Well water (ground water) etc. may be used. In particular, the water heater 1 according to the present embodiment is not only applied to tap water (soft water) having a low hardness component (calcium, magnesium, etc.), but tap water and well water (high hardness water) containing a lot of hardness components. It can also be applied to.

  The flow rate sensor 23 detects the flow rate of hot water flowing through the general hot water supply pipe 22, and can detect that the general hot water supply terminal is opened (operated) by flowing hot water through the general hot water supply pipe 22.

  The accumulator 24 has a function as a buffer that discharges hot water after the temperature of the hot water is lowered (heated) when discharged from a faucet or a shower.

  The hot water supply temperature sensor 26 detects the temperature of hot water flowing out from the hot water supply heat exchanger 50.

  In addition, the flow sensor 23 and the accumulator 24 are arrange | positioned downstream from the branch part S where the general hot water supply circuit 20 and the bathtub hot water supply circuit 30 branch. The hot water supply temperature sensor 26 is arranged on the upstream side of the branch (branch portion S) between the general hot water supply circuit 20 and the bathtub hot water supply circuit 30.

  The bathtub hot water supply circuit 30 is a flow path used for bathtub hot water supply, and includes a water supply pipe 21 and a bathtub hot water supply pipe 31. In addition, bathtub hot water supply is a thing of the utilization form which does not use and complete the supplied hot water, but stores and heats it again later.

  In addition, the hot water in the bathtub is not limited to the so-called hot water that accumulates hot water in the bathtub. Various hot water supply modes of heating hot water from a water supply source and supplying hot water to the bathtub, such as hot water for raising the temperature of the hot water, are also included.

  The water supply pipe 21 of the bathtub hot water supply circuit 30 is a common pipe with the water supply pipe 21 of the general hot water supply circuit 20.

  The bathtub hot water supply pipe 31 shares a part (22b) with the general hot water supply pipe 22 of the general hot water supply circuit 20, and is branched from the general hot water supply pipe 22 via the branch portion S.

  The bathtub hot water supply pipe 31 is provided with a flow rate adjusting valve 32, an electromagnetic valve 33, a flow rate sensor 34, a water level sensor 35, and a bathtub hot water supply temperature sensor 36 in order from the upstream side downstream from the branch portion S.

  The flow rate adjustment valve 32 adjusts the flow rate of hot water flowing through the bathtub hot water supply pipe 31, and the controller 100 appropriately controls the opening degree.

  For example, in the case of using only hot water in a bathtub without using general hot water (for example, only hot water), the opening degree of the flow rate adjustment valve 32 is adjusted to the maximum. The opening degree of the flow rate adjusting valve 32 is adjusted so that the flow rate of the hot water supply pipe 31 is reduced or the flow rate of the bathtub hot water supply pipe 31 is substantially zero.

  The electromagnetic valve 33 is an electromagnetically operated shut-off valve (ON / OFF valve) and is controlled to be opened and closed by the controller 100. By closing the solenoid valve 33, hot water supply to the bathtub is shut off. The solenoid valve 33 is provided with a backflow prevention function (such as a check valve) so that the bathtub water collected in the bathtub does not flow back to the general hot water supply circuit 20.

  The flow rate sensor 34 detects the flow rate of the hot water flowing through the bathtub hot water supply pipe 31. Moreover, the controller 100 can integrate the detection values of the flow sensor 34 to detect the amount of hot water to be poured into the bathtub.

  The water level sensor 35 detects the water level of the bathtub water stored in the bathtub. For example, when the controller 100 detects that a water level set in advance by the water level sensor 35 is reached during hot water supply to the bathtub, the hot water supply to the bathtub is stopped.

  The bathtub hot water supply temperature sensor 36 detects the temperature of hot water (hot water) supplied to the bathtub.

  The hot water temperature sensor 26 described above is located on the upstream side of the branch portion S, and is a common temperature sensor that detects the hot water temperature during general hot water supply and during hot water supply for bathtubs.

  The hot water supply heating circuit 40 takes out the heat medium (hot water) stored in the heat storage tank 10 and returns it to the heat storage tank 10. The hot water supply heat exchanger forward pipe 41, the hot water supply heat exchanger return pipes 42 and 43, And a hot water supply circulation pump 44.

  The hot water supply heat exchanger forward pipe 41 constitutes a flow path for supplying the heat medium (hot water) in the heat storage tank 10 to the hot water heat exchanger 50, the upstream end is connected to the upper part of the heat storage tank 10, and the downstream end is The hot water supply heat exchanger 50 is connected to the primary side inlet 51c.

  The hot water supply heat exchanger return pipe 42 has an upstream end connected to the outlet 51 d on the primary side of the hot water supply heat exchanger 50 and a downstream end connected to the inlet of the hot water supply circulation pump 44.

  The hot water supply heat exchanger return pipe 43 has an upstream end connected to the outlet (discharge port) of the hot water supply circulation pump 44 and a downstream end connected to the lower portion of the heat storage tank 10.

  The hot water supply circulation pump 44 is driven and controlled by the controller 100 to take out the heat medium (high temperature water) from the upper part of the heat storage tank 10 and return it to the lower part of the heat storage tank 10 for circulation.

  Further, the hot water circulation pump 44 changes the flow rate of the heat medium passing through the hot water supply heat exchanger 50 by controlling the rotational speed of a motor (not shown) by the controller 100, so that the It is possible to adjust the general hot water supply set temperature and the bath hot water set temperature by changing the heat transfer coefficient to the secondary side water supply.

  That is, in the present embodiment, the general hot water supply set temperature and the bathtub hot water set temperature are adjusted by changing the rotational speed of the hot water supply circulation pump 44.

  The hot water supply heat exchanger 50 introduces water supplied from the water supply pipe 21 through an inlet 51a of the water supply, and introduces a heat medium (hot water) taken out from the upper part of the heat storage tank 10 through the inlet 51c, so that water and heat are supplied. Heat is exchanged with the medium to heat the water. The hot water discharged from the hot water outlet 51 b after heat exchange is used for general hot water via the general hot water supply pipe 22 and used for hot water for the bathtub via the bathtub hot water supply pipe 31.

  Thus, the heat exchanger 50 for hot water supply of this embodiment is comprised as a heat exchanger shared with general hot water supply and bathtub hot water supply. The entire amount of the heat medium discharged from the outlet 51d of the hot water supply heat exchanger 50 is returned to the lower part of the heat storage tank 10.

  The controller 100 includes a CPU (Central Processing Unit), a ROM (Read Only Memory) that stores a program, a RAM (Random Access Memory), and the like, and the rotational speed of the motor of the hot water supply circulation pump 44 and the flow rate adjustment valve 32. And the opening and closing of the electromagnetic valve 33, the flow rates of the flow rate sensors 23 and 34, the water level of the bathtub water by the water level sensor 35, the tank temperature sensors 11 to 15, the water temperature sensor 25, the hot water temperature sensor 26, and Each temperature by the bathtub hot water supply temperature sensor 36 is acquired.

  Note that a bath remote controller 101 and a kitchen remote controller 102 are connected to the controller 100 by wire or wirelessly. The bath remote controller 101 and the kitchen remote controller 102 are provided with an operation unit for starting the water heater 1 and setting various operating conditions such as a general hot water set temperature and a bathtub hot water set temperature. The general hot water supply set temperature is a temperature when the hot water is discharged from a general hot water supply terminal (such as a faucet or a shower), and the bathtub hot water set temperature is the temperature of hot water stored in the bathtub by hot water or hot water. The controller 100 controls the heat pump unit 3, the flow rate adjustment valve 32, the electromagnetic valve 33, and the hot water supply circulation pump 44 based on the operation of the operation units of the bath remote controller 101 and the kitchen remote controller 102.

  Next, the operation of the water heater 1 according to this embodiment will be described. First, basic operations of boiling, general hot water supply, and bath hot water supply will be described with reference to FIG.

  In the case of boiling, for example, a heat medium (water) in the heat storage tank 10 is boiled by the heat pump unit 3 in a time zone of midnight power using a timer. That is, a heat medium (water) is sent from the lower part of the heat storage tank 10 to the heat pump unit 3 through the heat pump forward pipe 4, and the heat medium (hot water) heated by the heat pump unit 3 is supplied to the heat storage tank through the heat pump return pipe 5. By returning to the upper part of 10, for example, low temperature water is stored in the lower part, intermediate temperature water is stored in the middle part, and high temperature water is stored in the upper part in the heat storage tank 10. It is also possible to boil so that the entire heat storage tank 10 (almost the entire) becomes high-temperature water.

  In the case of general hot water supply, the operation is started when the flow rate sensor 23 detects the flow in the general hot water supply circuit 20. At this time, the electromagnetic valve 33 is closed. That is, when a general hot water supply terminal (such as a faucet) is opened, the controller 100 detects the flow of the general hot water supply circuit 20 by the flow rate sensor 23, and the hot water of the general hot water set temperature set in the operation unit of the kitchen remote controller is detected. The hot water supply circulation pump 44 is driven so as to be supplied from the general hot water supply terminal.

  Specifically, based on the heat medium temperature of the heat medium when the heat medium is taken out from the heat storage tank 10 detected by the tank temperature sensor 11, the water supply temperature detected by the water supply temperature sensor 25, and the flow rate detected by the flow sensor 23. The rotational speed of the motor of the hot water supply circulation pump 44 is controlled so that the temperature detected by the hot water supply temperature sensor 26 becomes the target temperature. For example, a plurality of tables relating to the heat medium temperature, the feed water temperature, the flow rate, and the rotation speed are provided, and the rotation speed is selected based on the table so that the target temperature can be set. Then, when the flow rate sensor 23 detects that the general hot water supply terminal is closed, the hot water supply circulation pump 44 is stopped.

  Note that the target temperature of the hot water supply temperature sensor 26 at the time of general hot water supply is a temperature corresponding to the general hot water supply set temperature set by the operation unit of the bath remote controller 101 or the kitchen remote controller 102, and hot water is supplied from the hot water supply temperature sensor 26 to the general hot water supply. The temperature is set higher than the general hot water supply set temperature in consideration of a temperature drop or the like until reaching the terminal (until the hot water comes out of the faucet). Further, the temperature ΔT to be added to the general hot water supply set temperature is appropriately set according to the piping length of the general hot water supply pipe 22 in the water heater 1.

  In the case of bathtub hot water supply, for example, the operation is started by turning on a hot water start operation switch provided in the operation unit of the bath remote controller. Before starting operation, the electromagnetic valve 33 is closed, and the opening degree of the flow rate adjustment valve 32 is set to the minimum.

  When the operation is started, the solenoid valve 33 is opened, and the opening degree of the flow rate adjustment valve 32 is controlled so as to gradually increase, and the bathtub hot water supply set temperature (hot water temperature) set by the operation unit of the bath remote controller. The rotational speed of the motor of the hot water supply circulation pump 44 is controlled so that hot water is supplied to the bathtub.

  More specifically, based on the feed water temperature detected by the feed water temperature sensor 25 and the flow rate detected by the flow sensor 34, the motor of the hot water supply circulation pump 44 so that the temperature detected by the hot water supply temperature sensor 26 becomes the target temperature. To control the rotation speed. Then, by detecting that a predetermined amount of hot water is stored in the bathtub by the integrated value of the detection value of the flow sensor 34 or the detection value of the water level sensor 35, the hot water supply circulation pump 44 is stopped, and the bathtub hot water supply is stopped. Exit.

  At the end of the hot water operation, the solenoid valve 33 is closed after the flow rate adjusting valve 32 is gradually (stepwise) throttled until it reaches the minimum (smaller). Thereby, it is possible to prevent an excessive pressure from being applied to the upstream side of the electromagnetic valve 33. On the other hand, at the start of hot water supply to the bathtub, the solenoid valve 33 is opened with the flow rate adjustment valve 32 being throttled (so that the solenoid valve 33 is not suddenly opened while the flow rate adjustment valve 32 remains large. By doing so, it is possible to prevent the sensor from malfunctioning due to the generation of negative pressure.

  Note that the target temperature in the hot water supply temperature sensor 26 is a temperature corresponding to the bathtub hot water supply set temperature set by the operation unit of the bath remote controller 101, and the temperature drop until the hot water reaches the bathtub from the hot water supply temperature sensor 26. In consideration of the above, etc., the temperature is set to be higher than the bath water supply set temperature. The temperature ΔT to be added to the bathtub hot water supply set temperature is appropriately set according to the pipe length of the bathtub hot water supply pipe 31 in the water heater 1.

  In addition to hot water, the hot water in the bathtub is used to increase the temperature of the hot water in the bathtub by adding hot water that is higher than the set temperature of the hot water in the bathtub when the temperature of the hot water in the bathtub becomes low. There is an additional hot water that adds hot water at the set temperature of the hot water supply to the bathtub when the water level of the hot water becomes low. Hot water can be used as an alternative to the so-called chasing mode. The temperature of the hot water is set higher than the temperature of the additional hot water.

  That is, in the case of hot water, the temperature detected by the hot water supply temperature sensor 26 is set to the target temperature (for example, 60 ° C.) based on the water supply temperature detected by the water supply temperature sensor 25 and the flow rate detected by the flow rate sensor 34. Then, the rotational speed of the motor of the hot water supply circulation pump 44 is controlled. And when the bathtub hot water temperature sensor 36 detects that the temperature of the bathtub water stored in the bathtub has reached the bathtub hot water set temperature, the hot water circulation pump 44 is stopped, and the hot water supply ends.

  At the start of hot water operation, the solenoid valve 33 is opened, and the opening of the flow rate adjustment valve 32 is controlled to gradually increase. At the end of operation, the opening of the flow rate adjustment valve 32 is minimized. After being gradually throttled, the electromagnetic valve 33 is closed.

  Moreover, control when general hot water supply is started at the time of bathtub hot water supply will be described with reference to FIGS. First, the control of the first embodiment will be described with reference to FIGS. FIG. 2 is a flowchart showing control when general hot water supply is detected during bath water supply, and FIG. 3 is a time chart showing an operation example corresponding to the flowchart of FIG. In the control of the first embodiment shown in FIGS. 2 and 3, the flow rate adjustment valve 32 corresponds to the valve described in claim 1 of the claims.

  As shown in FIG. 2, in step S <b> 110, the controller 100 determines whether or not the water heater 1 is hot water in the bathtub. Whether or not the bath water supply is being performed can be determined by whether or not the hot water switch of the bath remote controller 101 is in the ON state. During bath hot water supply, as described above, the rotation speed of the motor of the hot water supply circulation pump 44 is set so that the hot water supply temperature of the hot water supply temperature sensor 26 becomes the target temperature based on the supply water temperature of the water supply temperature sensor 25 and the flow rate of the flow rate sensor 34. Is controlled.

  In step S110, the controller 100 repeats the process of step S110 when determining that it is not hot water in the bathtub, and proceeds to step S120 when determining that hot water is being supplied in the bathtub.

  In step S120, controller 100 determines whether or not general hot water supply has been started. Whether or not the general hot water supply has started can be determined based on the detection value of the flow rate sensor 23 based on whether or not a flow has occurred in the general hot water supply pipe 22 downstream from the branch portion S (whether the flow rate is greater than zero).

  In step S120, if controller 100 determines that general hot water supply has not been started (No), it returns to the process of step S110, and if it is determined that general hot water supply has started (Yes), it proceeds to step S130. move on.

  In step S130, controller 100 determines whether or not the bathtub hot water supply set temperature is higher than the general hot water supply set temperature. When the controller 100 determines that the bathtub hot water set temperature is not higher than the general hot water set temperature (No in S130), the controller 100 returns to the process of step S110 and determines that the bathtub hot water set temperature is higher than the general hot water set temperature. If so (S130, Yes), the process proceeds to step S140.

  In step S140, the controller 100 controls the hot water supply circulation pump 44 so that the temperature of the hot water supply temperature sensor 26 becomes a temperature corresponding to the general hot water supply set temperature. That is, since it is necessary to set the general hot water supply set temperature lower than the bathtub hot water supply set temperature, the water supply from the water supply pipe 21 in the hot water supply heat exchanger 50 is reduced by reducing the rotational speed of the motor of the hot water supply circulation pump 44. The heat transfer by the heat medium (hot water) from the heat storage tank 10 is reduced, and the temperature of hot water (hot water temperature) coming out of the hot water supply heat exchanger 50 is lowered.

  In step S150, the controller 100 gradually reduces the opening degree of the flow rate adjustment valve 32 (controls the flow rate adjustment valve 32 in the closing direction). Thus, by gradually reducing the opening degree (maximum) of the flow rate adjustment valve 32, the opening degree of the flow rate adjustment valve 32 is increased at the start of the general hot water supply. The flow rate of hot water flowing through the general hot water supply pipe 22 downstream of the branch section S (hereinafter, referred to as a general hot water supply pipe 22a after branching) is increased. In addition, when the hot water supply capability of general hot water supply is insufficient, the bathtub hot water supply may be temporarily stopped. In this case, the opening degree of the flow rate adjustment valve 32 is reduced to the minimum. Preferably, the electromagnetic valve 33 is controlled to be closed at the same time.

  That is, the hot-water bath setting higher than the temperature corresponding to the general hot-water supply set temperature that exists in the general hot-water supply pipe 22 (hereinafter referred to as the pre-branch general hot-water supply pipe 22b) from the hot water supply heat exchanger 50 to the branch portion S. Most of the hot water having a temperature corresponding to the temperature flows to the bathtub hot water supply pipe 31 side. On the other hand, only a small amount of hot water flows through the general hot water supply pipe 22a after branching, and even if it flows into the general hot water supply pipe 22a (general hot water supply pipe 22) after branching, it flows through the general hot water supply pipe 22a and the accumulator 24 after branching. The temperature of the hot water set to a temperature corresponding to the hot water set temperature of the bathtub is mixed with the water accumulated before the hot water flows into the general hot water supply pipe 22a and the accumulator 24 after branching or the low temperature hot water (low temperature water). The water gradually decreases and is discharged from a general hot water supply terminal (faucet, shower, etc.). Thereafter, when the opening degree of the flow rate adjustment valve 32 is gradually reduced, hot water having a temperature corresponding to the general hot water supply set temperature is supplied from the hot water supply heat exchanger 50, and hot water flowing through the pre-branching general hot water supply pipe 22b. Is a temperature corresponding to the general hot water supply set temperature. Therefore, hot water having a high temperature deviating from the general hot water supply set temperature is not discharged from the general hot water supply terminal.

  And it progresses to step S160 and the controller 100 judges whether general hot water supply was complete | finished. Note that whether or not the general hot water supply has ended can be determined by detecting that the detection value (flow rate) is zero based on the detection value of the flow rate sensor 23.

  In step S160, when controller 100 determines that general hot water supply has not ended (No), it repeats the process of step S160, and when it is determined that general hot water supply has ended (Yes), it proceeds to step S170. move on.

  In step S <b> 170, the controller 100 controls the hot water supply circulation pump 44 so that the temperature (target temperature) detected by the hot water supply temperature sensor 26 becomes a temperature corresponding to the bathtub hot water supply set temperature. That is, in this case, since it is necessary to make the bath hot water set temperature higher than the general hot water set temperature, the water supply pipe in the hot water heat exchanger 50 is increased by increasing the rotational speed of the motor of the hot water circulating pump 44. The heat transfer by the heat medium from the heat storage tank 10 to the water supply from 21 is increased, and the temperature of the hot water supplied from the hot water heat exchanger 50 is increased.

  And it progresses to step S180 and the controller 100 expands gradually from the state which restrict | squeezed the opening degree of the flow regulating valve 32. FIG. Thereby, the hot water of the temperature corresponding to the bathtub hot-water supply preset temperature is supplied from the heat exchanger 50 for hot-water supply to the bathtub through the bathtub hot-water supply pipe 31, whereby the hot-water supply of the bathtub is resumed.

  And it progresses to step S190 and the controller 100 judges whether the bathtub hot water supply (hot water) was complete | finished. It should be noted that whether or not the bathtub hot water supply has ended is determined by adding the detection value of the flow rate sensor 34 to the predetermined value by adding the bathtub hot water supply amount before the start of the general hot water supply and the bathtub hot water supply amount after the end of the general hot water supply. Judgment can be made by whether or not it has been reached. Alternatively, it can be determined whether the water level detected by the water level sensor 35 has reached a water level preset by the bath remote controller.

  In step S190, the controller 100 returns to step S110 (may be S120) when it is determined that the bathtub hot water supply has not ended (No), and when it is determined that the bathtub hot water supply has ended (Yes), Return. When it is determined that the bath water supply has been completed (S190, Yes), first, the flow rate adjustment valve 32 is gradually throttled until the opening degree is minimized, and then the electromagnetic valve 33 is closed.

  In the above-described embodiment, the case of hot water as an example of hot water supply for a bathtub has been described as an example. That is, the hot water supply circulation pump 44 is controlled so that the temperature of the hot water supply temperature sensor 26 reaches a preset target temperature (for example, 60 ° C.), and the hot water supply heat exchanger 50 heats the supplied water. And after opening the solenoid valve 33, the opening degree of the flow regulating valve 32 is gradually expanded, hot water is added to the bathtub, and the temperature of bathtub water is raised. Note that the temperature of the hot water is set higher than the temperature of the hot water.

  Further, when general hot water supply is started during hot water supply, the hot water supply circulation pump 44 is set so that the temperature of the hot water supply temperature sensor 26 becomes a temperature corresponding to the general hot water supply set temperature as in the case of hot water. Control (S140). Then, the solenoid valve 33 is not immediately closed, and after the temperature of the hot water supply temperature sensor 26 reaches a temperature corresponding to the general hot water supply set temperature, the opening of the flow rate adjustment valve 32 is gradually reduced (S150). By closing the solenoid valve 33 when the temperature reaches the minimum, a small amount of hot water having a temperature corresponding to the set temperature of the hot water supply in the bathtub remaining in the pre-branching general hot water supply pipe 22b at the start of general hot water supply is supplied to the general hot water supply pipe 22a after branching. Since it only flows in, when the hot water is discharged from the general hot water supply terminal, the hot water is cooled by passing through the general hot water supply pipe 22a and the accumulator 24 after being branched and mixed with the remaining water. . Therefore, the temperature of the hot water discharged from the general hot water supply terminal does not exceed the general hot water supply set temperature.

  When the general hot water supply is completed (S160, Yes), the hot water supply circulation pump 44 is controlled so that the temperature of the hot water supply temperature sensor 26 becomes a temperature corresponding to the bath hot water set temperature (S170), and the flow rate adjusting valve. The opening of 32 is gradually enlarged until it reaches the maximum (S180). And when the temperature of the bathtub water collected in the bathtub becomes the bathtub hot-water supply preset temperature by the bathtub hot-water supply temperature sensor 36, it can be judged that the bathtub hot-water supply has ended (S190, Yes).

  As shown in FIG. 3, when hot water is being supplied from a bathtub (hot water, hot water, etc.) at times t0 to t1 (S110, Yes), the hot water supply circulation pump 44 has a hot water supply temperature sensor 26 whose temperature is The temperature is controlled to be a temperature corresponding to the hot water supply set temperature (a temperature higher than the bathtub hot water set temperature). Moreover, since the solenoid valve 33 is opened and the opening degree of the flow rate adjusting valve 32 is set to the maximum, the flow rate of the hot water for the bathtub is maximized and the flow rate of the general hot water is zero.

  When the flow sensor 23 detects the start of general hot water supply at time t1 (S120, Yes), the temperature of the hot water supply temperature sensor 26 corresponds to the general hot water supply set temperature (temperature higher than the general hot water supply set temperature). By reducing the rotational speed of the motor of the hot water supply circulation pump 44 so as to become (S140), the temperature of the hot water coming out of the hot water supply heat exchanger 50 is lowered. Further, the flow rate adjustment valve 32 is gradually throttled (S150), so that the flow rate of the hot water in the bathtub gradually decreases, and the flow rate of the general hot water gradually increases.

  At time t2, the temperature of the hot water coming out of the hot water supply heat exchanger 50 (the temperature of the hot water supply temperature sensor 26) decreases to a temperature corresponding to the general hot water supply set temperature. In addition, by setting the opening degree of the flow rate adjustment valve 32 to the minimum, the flow rate of the hot water in the bathtub becomes zero (almost zero), and the entire amount of hot water from the hot water supply heat exchanger 50 is supplied to the general hot water supply terminal. .

  By the way, even if general hot water supply is started at the time t1 to t2, it corresponds to the bathtub hot water set temperature remaining in the pre-branching general hot water supply pipe 22b located between the hot water supply heat exchanger 50 and the branch portion S. Since most of the hot water having the temperature flows to the bathtub side through the flow rate adjusting valve 32, a small amount of hot water having a temperature corresponding to the set temperature of the hot water supply to the bathtub flows into the general hot water supply pipe 22a after branching. Thus, even if a small amount of hot water flows into the general hot water supply pipe 22a after branching, the hot water is cooled by being mixed with water remaining while passing through the general hot water supply pipe 22a and the accumulator 24 after branching. In addition, even if the opening degree of the flow rate adjustment valve 32 is set to the minimum and the entire amount of hot water from the hot water supply heat exchanger 50 flows into the general hot water supply pipe 22a after branching, at the time when the opening degree is the minimum, the heat for hot water supply Since the hot water having a temperature corresponding to the general hot water supply set temperature is supplied from the exchanger 50, high hot water deviating from the general hot water supply set temperature is not discharged from the general hot water supply terminal.

  When the end of the general hot water supply is detected by the flow rate sensor 23 at time t3 (S160, Yes), the rotation speed of the hot water supply circulation pump 44 so that the temperature of the hot water supply temperature sensor 26 becomes a temperature corresponding to the set temperature of the hot water supply for the bath water. Is raised (S170). Moreover, the flow rate of the bathtub hot water supply is increased by gradually increasing the opening degree of the flow rate adjustment valve 32 (S180). And at the time t4, the temperature of the hot water supply temperature sensor 26 becomes a temperature corresponding to the bathtub hot water supply set temperature.

  At time t5, when the end of the hot water supply is detected (S190, Yes), the hot water supply circulation pump 44 is stopped, and the flow rate adjustment valve 32 is controlled to a minimum (fully closed) direction. And at the time t6, when the opening degree of the flow regulating valve 32 becomes the minimum, the electromagnetic valve 33 is closed and the hot water supply for the bathtub is finished.

  As described above, according to the water heater 1 according to the first embodiment, when the hot water supply set temperature is set higher than the general hot water supply set temperature, the general hot water supply is started during the hot water supply for the bathtub. In addition, the opening degree of the flow rate adjustment valve 32 is not immediately minimized, but the opening degree of the flow rate adjustment valve 32 is gradually reduced to cope with the bath hot water set temperature remaining in the pre-branch general hot water supply pipe 22b. The hot water thus made can be released to the bathtub hot water supply pipe 31. Moreover, even if part of the hot water corresponding to the hot water set temperature for the bathtub flows into the general hot water supply pipe 22a after branching, it is mixed with the water accumulated in the general hot water supply pipe 22a after branching while passing through the general hot water supply pipe 22a after branching. In addition, since the hot water is cooled, it is possible to suitably prevent hot water having a high temperature deviating from the general hot water supply set temperature from the general hot water supply terminal.

  Moreover, according to 1st Embodiment, since the accumulator 24 is arrange | positioned at the general hot water supply pipe 22a after a branch, since the temperature of warm water falls by mixing with the water collected in the space of the accumulator 24, general hot water supply preset temperature It is possible to more suitably prevent high temperature hot water that deviates from the standard hot water supply terminal.

(Modification of the first embodiment)
FIG. 4 is a flowchart showing control when general hot water is detected during bath hot water supply in the hot water heater according to the modification of the first embodiment, and FIG. 5 is a time chart showing an operation example corresponding to the flowchart of FIG. is there. In addition, the water heater which concerns on the modification of 1st Embodiment is a structure which is not provided with the flow volume adjustment valve 32 of the water heater 1 of 1st Embodiment. Moreover, in the modification of 1st Embodiment, the electromagnetic valve 33 is corresponded to the valve of Claim 1 of a claim. Moreover, the same step code | symbol is shown about the process similar to the flowchart of FIG. 2, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 4, the controller 100 controls the hot water supply circulation pump 44 to a temperature corresponding to the general hot water supply set temperature (S140), and then proceeds to step S145 to determine whether or not a predetermined time has elapsed. to decide. Predetermined time is the time to perform hot water for bathtubs and general hot water at the same time, in order to prevent hot water (hot water) heated for bath hot water from flowing out to general hot water terminals (faucets, etc.) It means the time (operation) for escaping to the bathtub hot water supply side.

The predetermined time is, for example, the time until the hot water exiting the hot water supply heat exchanger 50 exceeds the branch portion S between the general hot water supply pipe 22 and the bathtub hot water supply pipe 31, and flows through the pre-branching general hot water supply pipe 22b. It can be determined based on the flow rate of hot water (m ³ / s) and the pipe volume of the pipe (cross-sectional area × pipe length: m ³ ). That is, it is the time until the warm water that has exited the hot water supply heat exchanger 50 passes through the branch portion S.

  Another example of the predetermined time is the time until the temperature of the hot water after the heat exchange by the hot water supply heat exchanger 50 (the temperature of the hot water supply temperature sensor 26) decreases to a temperature corresponding to the general hot water supply set temperature. May be. Alternatively, it may be a time until the rotation speed of the motor of the hot water supply circulation pump 44 reaches a rotation speed corresponding to a temperature corresponding to the general hot water supply set temperature.

  In step S145, when it is determined that the predetermined time has not elapsed (No), the controller 100 repeats the process of step S145, and when it is determined that the predetermined time has elapsed (Yes), the controller 100 proceeds to step S155. move on.

  In step S155, the controller 100 closes the electromagnetic valve 33. Thereby, the hot water supply from the bathtub is temporarily stopped, and the entire amount of hot water discharged from the hot water supply heat exchanger 50 is supplied to the general hot water supply terminal.

  In step S160, when the controller 100 detects the end of the general hot water supply (Yes), the controller 100 proceeds to step S170, and the hot water supply circulation pump is set so that the temperature of the hot water supply temperature sensor 26 becomes a temperature corresponding to the bathtub hot water supply set temperature. 44, the process proceeds to step S185, and the solenoid valve 33 is opened. Bathtub hot water supply is resumed by opening the solenoid valve 33.

  As shown in FIG. 5, at the time t11, when the hot water supply is detected by the flow rate sensor 23 during bath hot water supply (S110, Yes) (S120, Yes), the temperature of the hot water temperature sensor 26 becomes the general hot water set temperature. (S140), the temperature of the hot water coming out of the hot water supply heat exchanger 50 (the temperature of the hot water supply temperature sensor 26) is reduced.

  In addition, at time t11, the general hot water supply terminal is opened, so that the flow rate of the general hot water supply is increased, and the flow rate of the general hot water supply is increased. Then, if the amount of hot water discharged from the general hot water supply terminal does not change, both general hot water supply and bathtub hot water supply change at a constant flow rate.

  Then, at time t12 after a lapse of a predetermined time from time t11 (S145, Yes), by closing the solenoid valve 33 (S155), the flow rate of the hot water supply to the bath becomes zero and the flow rate of the general hot water supply becomes open. The flow rate depends on the degree. As described above, the predetermined time is the time until the entire amount of hot water accumulated in the pre-branching general hot water supply pipe 22b from the hot water supply heat exchanger 50 to the branch portion S passes through the branch portion S, or hot water supply. Time until the temperature of the hot water (temperature of the hot water supply temperature sensor 26) after heat exchange in the heat exchanger 50 decreases to a temperature corresponding to the general hot water supply set temperature, or the rotational speed of the motor of the hot water supply circulation pump 44 Can be set to the time until the rotational speed corresponding to the temperature corresponding to the general hot water supply set temperature is reached.

  By the way, even if the general hot water supply is started at time t11 to t12, the electromagnetic valve 33 is open for a predetermined time, so that it corresponds to the set temperature of the hot water supply for the bathtub remaining in the general hot water supply pipe 22b before branching. Most of the hot water having the temperature flows through the electromagnetic valve 33 to the bathtub side. Therefore, a small amount of hot water having a temperature corresponding to the bathtub hot water set temperature flows through the general hot water supply pipe 22a after branching. Even if this small amount of hot water flows into the general hot water supply pipe 22a after branching, the hot water having a temperature corresponding to the set temperature for hot water supply to the bathtub is cooled while passing through the general hot water supply pipe 22a and the accumulator 24 after branching, and then Hot water having a temperature not exceeding the set temperature is discharged from the general hot water supply terminal.

  Then, when the end of the general hot water supply is detected by the flow rate sensor 23 at time t13 (S160, Yes), the hot water supply circulation pump 44 is rotated so that the temperature of the hot water supply temperature sensor 26 becomes a temperature corresponding to the bathtub hot water supply set temperature. The speed is increased (S170). Further, when the general hot water supply terminal is closed, the flow of the general hot water supply becomes zero by ending the general hot water supply.

  At time t14, when the temperature of the hot water supply temperature sensor 26 reaches a temperature corresponding to the bathtub hot water supply set temperature, the electromagnetic valve 33 is opened (S185), and the bathtub hot water supply is resumed. Thereby, the hot water of bathtub hot water supply preset temperature is supplied to a bathtub.

  At time t15, when the end of the hot water supply is detected (S190, Yes), the hot water supply circulation pump 44 is stopped and the solenoid valve 33 is closed.

  According to such a water heater according to the modification of the first embodiment, even when the flow rate adjustment valve 32 is not provided as in the first embodiment, when the general hot water is detected during the bath water supply, When the hot water supply set temperature is higher than the general hot water supply set temperature, the electromagnetic valve 33 is not immediately closed, but the electromagnetic valve 33 is closed after waiting for a predetermined time, so that the bathtub remaining in the general hot water supply pipe 22b before branching. Since most of hot water having a temperature corresponding to the hot water supply set temperature flows to the bathtub hot water supply pipe 31, it can be prevented from flowing only to the general hot water supply pipe 22a (only the general hot water supply terminal) after branching. Therefore, even if hot water having a temperature corresponding to the bath hot water set temperature flows into the post-branching general hot water supply pipe 22a, the amount is small, so that it is mixed with the water accumulated in the general hot water supply pipe 22a after branching and cooled. Therefore, it is possible to suitably prevent hot water having a high temperature deviating from the general hot water supply set temperature from coming out of the general hot water supply terminal.

  Moreover, according to the modification of 1st Embodiment, since the accumulator 24 is arrange | positioned at the general hot water supply pipe 22a after a branch, since the temperature of warm water falls by mixing with the water collected in the space of the accumulator 24, general It can prevent more suitably that the hot water of the high temperature which deviated from the hot water supply preset temperature comes out from a general hot water supply terminal.

  In the modification of the first embodiment, the case where the flow rate adjustment valve 32 is not provided has been described. However, the present invention is not limited to this, and the flow rate adjustment valve 32 is installed together with the electromagnetic valve 33 as in the first embodiment. The structure provided may be sufficient.

(Second Embodiment)
FIG. 6 is a flowchart showing control when general hot water is detected during bath water supply in the hot water supply apparatus according to the second embodiment, and FIG. 7 is a time chart showing an operation example corresponding to the flowchart of FIG. In addition, the structure of the water heater in 2nd Embodiment is the same as that of the water heater 1 in 1st Embodiment.

  In step S210, the controller 100 determines whether or not the water heater 1 is hot watering in the bathtub. Whether the hot water in the bathtub is being supplied can be determined, for example, by checking whether the hot water switch of the bath remote controller 101 is in the ON state. During bath hot water supply, as described above, the hot water temperature of the hot water temperature sensor 26 is based on the heat medium temperature of the tank temperature sensor 11, the feed water temperature of the feed water temperature sensor 25, and the flow rate of the flow rate sensor 34. The rotational speed of the motor of the hot water supply circulation pump 44 is controlled so that the temperature of

  In step S210, the controller 100 repeats the process of step S210 when determining that the hot water is not being supplied from the bathtub, and proceeds to step S220 when determining that the hot water is being supplied from the bathtub.

  In step S220, the controller 100 determines whether or not the bathtub hot-water supply set temperature is higher than the general hot-water supply set temperature, and if it is determined that the bathtub hot-water supply set temperature is not higher than the general hot-water supply set temperature (No). Returning to the process of step S210, when it is determined that the bathtub hot-water supply set temperature is higher than the general hot-water supply set temperature (Yes), the process proceeds to step S230.

  In step S230, the controller 100 determines whether or not a hot water supply amount obtained by subtracting a predetermined hot water supply amount ΔQ from an end bathtub hot water supply amount for ending the bathtub hot water supply is reached. The end bathtub hot water supply amount is, for example, a hot water supply amount set in advance by the bath remote controller 101. The predetermined hot water supply amount ΔQ is the hot water supply amount before (immediately before) reaching the end bathtub hot water supply amount. Specifically, when the end bathtub hot water supply is 200 liters, ΔQ is set to 10 liters, and determination is made based on whether or not 190 (end bath water supply amount−ΔQ) liters has been reached. Whether or not the end bathtub hot water supply amount has been reached can be determined from the integrated value of the flow rate of the flow rate sensor 34 or the detection value of the water level sensor 35.

  In step S230, when the controller 100 determines that the end bathtub hot water supply amount has not been reached (No), the process of step S230 is repeated (may return to S210 or S220) to reach the end bathtub hot water supply amount. If it is determined that the determination has been made (Yes), the process proceeds to step S240.

  In step S240, the controller 100 controls the rotational speed of the motor of the hot water supply circulation pump 44 so that the temperature of the hot water supply temperature sensor 26 becomes a temperature corresponding to the general hot water supply set temperature. That is, since it is necessary to set the general hot water supply set temperature lower than the bathtub hot water supply set temperature, the water supply from the water supply pipe 21 in the hot water supply heat exchanger 50 is reduced by reducing the rotational speed of the motor of the hot water supply circulation pump 44. Heat transfer by the heat medium from the heat storage tank 10 is reduced, and the hot water temperature (hot water temperature) from the hot water heat exchanger 50 is lowered.

  And in step S250, the controller 100 complete | finishes bathtub hot-water supply. That is, the flow rate adjustment valve 32 is gradually throttled until the opening degree is minimized, and then the electromagnetic valve 33 is closed.

  As shown in FIG. 7, at time t21, when hot water of an amount ΔQ smaller than the end bathtub hot water supply amount is stored in the bathtub, the hot water supply temperature sensor 26 has a temperature corresponding to the general hot water supply set temperature. The rotational speed of the motor of the circulating pump 44 is reduced. Thereby, the temperature of the hot water coming out of the hot water supply heat exchanger 50 (the temperature of the hot water supply temperature sensor 26) decreases.

  At time t22, when the temperature of the hot water supply temperature sensor 26 reaches a temperature corresponding to the general hot water supply set temperature, at time t23 after gradually reducing the opening of the flow rate adjustment valve 32 to the minimum, the electromagnetic The valve 33 is closed and the bathtub hot water supply is terminated. The predetermined hot water supply amount Q is set so as to reach the end bathtub hot water supply amount at time t23 when the bathtub hot water supply ends, for example.

  According to such a water heater of the second embodiment, when bath water is to be supplied, when the bath water supply set temperature is higher than the general hot water set temperature, prior to the end of the bath water supply (for example, immediately before the end of the bath water supply). ) By controlling the hot water supply circulation pump 44 so that the temperature of the hot water supply temperature sensor 26 becomes a temperature corresponding to the general hot water supply set temperature, the general hot water supply terminal ( Even if a faucet or the like is opened, it is possible to suitably prevent hot water having a high temperature deviating from the general hot water supply set temperature from the general hot water supply terminal.

  In the second embodiment, the hot water beam has been described as an example. However, the present invention is not limited to this, and as described in the first embodiment, a hot water supply is performed as hot water for a bathtub. In addition, by controlling the hot water supply circulation pump 44 so as to reach a temperature corresponding to the general hot water supply set temperature prior to the end of the hot water supply, a general hot water supply terminal (such as a faucet) is provided after the hot water supply ends (immediately after the end). ) Can be suitably prevented from coming out of hot water having a high temperature deviating from the general hot water supply set temperature from the general hot water supply terminal. The same applies to the case of adding water.

  In the second embodiment, the configuration including the flow rate adjusting valve 32 and the electromagnetic valve 33 has been described as an example. However, the configuration is not limited to this, and the flow rate of the flow rate adjusting valve 32 and the electromagnetic valve 33 is not limited thereto. The structure provided with the adjustment valve 32 may be sufficient, or the structure provided only with the solenoid valve 33 may be sufficient.

  In the second embodiment, at time t21, the hot water supply circulation pump 44 is controlled so that the temperature of the hot water supply temperature sensor 26 reaches a temperature corresponding to the general hot water supply set temperature (time t22). Although the case where control is performed so as to narrow down (maximum → minimum) has been described as an example, it is not limited to such control. For example, although not shown in the figure, immediately before the end of bath hot water supply, the control of the hot water supply circulation pump 44 is started at the same time as the temperature of the hot water supply temperature sensor 26 becomes a temperature corresponding to the general hot water supply set temperature (in FIG. 7). The flow rate adjustment valve (valve) 32 may be controlled (controlled in the closing direction) at the time t21). Note that the term “immediately before the end of bath water supply” refers to, for example, the time when the amount of hot water supplied until the opening degree of the flow rate adjustment valve 32 can be minimized is reached from the amount of hot water supplied to the end bathtub.

  According to such a configuration, since it is possible to further shorten the time from the start of the control from the bathtub hot water set temperature to the general hot water set temperature to the end of the bath hot water, hot water having a temperature lower than the bathtub hot water set temperature is obtained. Supply to the bathtub for a long time can be reduced, and the temperature of the bathtub water can be prevented from greatly decreasing. When the solenoid valve 33 is provided together with the flow rate adjustment valve 32 (valve), the hot water supply circulation pump 44 is controlled so that the temperature of the hot water supply temperature sensor 26 becomes a temperature corresponding to the general hot water supply set temperature ( 7), the electromagnetic valve 33 is closed.

  In addition, although not shown, the solenoid valve 33 (valve) is used instead of the flow rate adjustment valve 32, and the hot water supply circulation pump 44 is controlled immediately before the end of the hot water supply for the bathtub, and after the heat exchange in the hot water supply heat exchanger 50 is performed. At the same time that the hot water temperature reaches a temperature corresponding to the general hot water supply set temperature (corresponding to time t22 in FIG. 7), the electromagnetic valve 33 may be closed (controlled in the closing direction). Note that the term “immediately before the end of bathtub hot water supply” refers to, for example, the time when the amount of hot water supplied until the solenoid valve 33 can be closed is subtracted from the amount of hot water supplied to the end bathtub.

  According to such a configuration, similarly to the above, it is possible to shorten the time from the start of the control to the general hot water supply set temperature to the end of the hot water supply of the hot water bath, so that it is lower than the set temperature of the hot water supply for the bath water. It can reduce that the hot water of temperature is supplied to a bathtub for a long time, and can prevent that the temperature of bathtub water falls significantly.

  Further, in the first embodiment, the modified example of the first embodiment, and the second embodiment, the hot water heater 1 having the system configuration shown in FIG. 1 has been described as an example, but the downstream of the hot water heat exchanger 50 is described. The branch part S of the general hot water supply circuit 20 and the bathtub hot water supply circuit 30 may be configured in the vicinity of the outlet 51b of the hot water supply heat exchanger 50. That is, the closer the branch portion S is to the outlet 51b of the hot water supply heat exchanger 50, the better. Thereby, the distance of the heat exchanger 50 for hot water supply and the branch part S can be shortened (shortest), and in the water heater in 1st Embodiment, the modification of 1st Embodiment, and 2nd Embodiment, It is possible to further shorten the time when the general hot water supply and the bathtub hot water supply are simultaneously performed when the start of the hot water supply is detected, that is, the time until the hot water having exited the hot water supply heat exchanger 50 exceeds the branch portion S.

  In the first embodiment, the control of gradually reducing the flow rate adjustment valve 32 has been described as an example. However, like the electromagnetic valve 33 in the modification of the first embodiment, the flow rate is waited for a predetermined time. A configuration in which the opening degree of the regulating valve 32 is switched from the maximum to the minimum may be employed.

  Further, in FIG. 1, the configuration including the flow rate adjustment valve 32 (which cannot be fully closed completely) and the electromagnetic valve 33 has been described as an example. . Thereby, the electromagnetic valve 33 can be made unnecessary.

  Further, in the present embodiment, the case where the hot water supply temperature is controlled to be the general hot water supply set temperature or the bath hot water set temperature based on the rotation speed of the motor of the hot water supply circulation pump 44 has been described as an example. It is not limited, and for the purpose of more accurately adjusting the temperature of the hot water at the general hot water set temperature or the bath hot water set temperature, the mixing valve is connected to the general hot water pipe 22 and the bath hot water pipe 31 downstream of the hot water heat exchanger 50. May be provided.

1 Water heater 2 Heat storage tank unit 3 Heat pump unit (heating means)
DESCRIPTION OF SYMBOLS 10 Heat storage tank 20 General hot water supply circuit 21 Water supply pipe 22 General hot water supply pipe 22a General hot water supply pipe 22b after branching General hot water supply pipe 23 before branching 23 Flow rate sensor 24 Accumulator 25 Hot water supply temperature sensor 26 Hot water supply temperature sensor 30 Bath hot water supply circuit 31 Bath hot water supply pipe 32 Valve (valve)
33 Solenoid valve (valve)
34 Flow rate sensor 35 Water level sensor 36 Bath hot water supply temperature sensor 40 Hot water supply heating circuit 41 Hot water supply heat exchanger outgoing pipe 42, 43 Hot water supply heat exchanger return pipe 44 Hot water supply circulation pump 50 Hot water supply heat exchanger 100 Controller (control unit)
101 Bath remote control 102 Kitchen remote control S Branch

Claims (7)

A heat storage tank for storing a heat medium;
Heating means for heating the heat medium in the heat storage tank;
A general hot water supply circuit for supplying hot water to a general hot water supply terminal;
A bathtub hot water supply circuit for supplying hot water to the bathtub;
A hot water supply heating circuit that takes out the heat medium stored in the heat storage tank and returns it to the heat storage tank;
A hot water supply heat exchanger that is provided in the heating circuit for hot water supply and heats the water supplied to the general hot water supply terminal and the water supplied to the bathtub by exchanging heat with the heat medium;
A hot water supply circulation pump that is provided in the hot water supply heating circuit and circulates the heat medium between the heat storage tank and the hot water supply heat exchanger;
A control unit for controlling the heating circuit and the hot water supply circulation pump;
With
The hot water supply heat exchanger is common for general hot water supply and bathtub hot water supply,
A valve is arranged in the bathtub hot water supply circuit downstream from the branch of the general hot water supply circuit and the bathtub hot water supply circuit,
When the hot water set temperature is higher than the general hot water set temperature, the control unit detects the general hot water during bath hot water, and the hot water temperature after heat exchange in the hot water heat exchanger is the general hot water set temperature. A hot water supply apparatus which controls the valve in the closing direction while controlling the hot water supply circulation pump so as to have a temperature corresponding to, and simultaneously performing bathtub hot water supply and general hot water supply. A heat storage tank for storing a heat medium;
Heating means for heating the heat medium in the heat storage tank;
A general hot water supply circuit for supplying hot water to a general hot water supply terminal;
A bathtub hot water supply circuit for supplying hot water to the bathtub;
A hot water supply heating circuit that takes out the heat medium stored in the heat storage tank and returns it to the heat storage tank;
A hot water supply heat exchanger that is provided in the heating circuit for hot water supply and heats the water supplied to the general hot water supply terminal and the water supplied to the bathtub by exchanging heat with the heat medium;
A hot water supply circulation pump that is provided in the hot water supply heating circuit and circulates the heat medium between the heat storage tank and the hot water supply heat exchanger;
A control unit for controlling the heating circuit and the hot water supply circulation pump;
With
The hot water supply heat exchanger is common for general hot water supply and bathtub hot water supply,
A valve is arranged in the bathtub hot water supply circuit downstream from the branch of the general hot water supply circuit and the bathtub hot water supply circuit,
When the hot water set temperature of the bathtub is higher than the set temperature of the general hot water supply, the control unit does not stop the hot water supply of the hot water immediately after the hot water is detected during the hot water supply of the bathtub, but after the heat exchange with the heat exchanger for hot water supply. The hot water circulation pump is controlled so that the hot water temperature of the hot water becomes a temperature corresponding to the general hot water supply set temperature, and after flowing a part of the hot water flowing out from the hot water heat exchanger into the bathtub hot water supply circuit, A water heater that controls the valve in a closing direction. The valve is configured to include a flow rate adjustment valve capable of adjusting an opening,
When the hot water set temperature is higher than the general hot water set temperature, the control unit detects the general hot water during bath hot water, and the hot water temperature after heat exchange in the hot water heat exchanger is the general hot water set temperature. The hot water supply apparatus according to claim 1 or 2, wherein the hot water supply circulation pump is controlled so as to have a temperature corresponding to, and the flow rate adjustment valve is controlled in a closing direction. The valve comprises an electromagnetic valve that can be controlled to open and close,
When the hot water set temperature is higher than the general hot water set temperature, the control unit detects the general hot water during bath hot water, and the hot water temperature after heat exchange in the hot water heat exchanger is the general hot water set temperature. 3. The water heater according to claim 1, wherein the solenoid valve is controlled in a closing direction after the hot water circulation pump is controlled to have a temperature corresponding to the temperature. A heat storage tank for storing a heat medium;
Heating means for heating the heat medium in the heat storage tank;
A general hot water supply circuit for supplying hot water to a general hot water supply terminal;
A bathtub hot water supply circuit for supplying hot water to the bathtub;
A hot water supply heating circuit that takes out the heat medium stored in the heat storage tank and returns it to the heat storage tank;
A hot water supply heat exchanger that is provided in the heating circuit for hot water supply and heats the water supplied to the general hot water supply terminal and the water supplied to the bathtub by exchanging heat with the heat medium;
A hot water supply circulation pump that is provided in the hot water supply heating circuit and circulates the heat medium between the heat storage tank and the hot water supply heat exchanger;
A control unit for controlling the heating circuit and the hot water supply circulation pump;
With
The hot water supply heat exchanger is common for general hot water supply and bathtub hot water supply,
A valve is arranged in the bathtub hot water supply circuit downstream from the branch of the general hot water supply circuit and the bathtub hot water supply circuit,
When the bathtub hot water set temperature is higher than the general hot water set temperature, the control unit sets the temperature corresponding to the general hot water set temperature prior to the end of the bathtub hot water reaching the preset end hot water supply amount or the end bath hot water time. The hot water supply machine characterized by controlling the hot water supply circulation pump. The valve is configured to include a flow rate adjustment valve capable of adjusting an opening,
When the bathtub hot water set temperature is higher than the general hot water set temperature, the control unit uses the hot water supply circulation pump for the hot water supply immediately before the end of the bathtub hot water reaching the preset end hot water supply amount or the end bathtub hot water supply time. 6. The control of the flow rate adjusting valve in the closing direction is started simultaneously with the start of control so that the hot water temperature after heat exchange in the heat exchanger becomes a temperature corresponding to the general hot water supply set temperature. Water heater. The valve comprises an electromagnetic valve that can be controlled to open and close,
When the bathtub hot water set temperature is higher than the general hot water set temperature, the control unit controls the hot water circulation pump to control the hot water circulation pump immediately before the end of the bathtub hot water reaching the preset end hot water supply amount or the end bathtub hot water supply time. The hot water heater according to claim 5, wherein the temperature of the hot water after heat exchange in the heat exchanger for hot water supply reaches a temperature corresponding to the set temperature for the general hot water supply, and the solenoid valve is controlled in the closing direction.

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