JP4705838B2 - Hot water storage water heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hot water storage type hot water supply apparatus that uses hot water stored in a hot water storage tank (can body) to replenish bathtub water.

Conventionally, eco-cute (natural refrigerant heat pump water heater), heat pump hot water storage water heater, and electric water heater have been able to recharge tub water using hot water stored in a hot water storage tank. In this hot water storage type hot water supply device, when there is a restocking instruction, the hot water temperature of the hot water storage tank is detected, and if the hot water temperature is above a predetermined temperature, the bath circulation pump is driven to turn the bath water into the heat exchanger. Circulating and driving. In addition, when the hot water temperature in the hot water storage tank drops to a temperature insufficient for reheating during reheating operation, hot water is generated by operating reheating means (heating means) and hot water supplying means. The heating operation is performed (for example, refer to Patent Document 1).
Japanese Patent Laying-Open No. 2003-50048 (Claims, FIGS. 1 and 3)

  However, in the hot water storage type hot water supply apparatus described in Patent Document 1, the determination condition for starting the boiling increase operation is set when the hot water storage temperature in the hot water storage tank reaches a predetermined determination temperature (for example, 60 ° C.). . For this reason, when the determination temperature determined by the temperature sensor is relatively high, it is possible to ensure a reheating capability that can always perform hot water supply at a high temperature of the hot water, but the boiling temperature increases so as to always ensure the determination temperature. Driving is performed. As a result, when there is no need to recap, there is a problem that energy is wasted and inefficient.

  On the other hand, when the judgment temperature is low, when using reheating, the heat of the hot water stored in the bathtub is lost due to heat exchange with the bathtub water in the bathtub, and the amount of heat increases during reheating operation, resulting in an increase in boiling. Even when the operation is started, there is a problem in that the amount of heat that can be replenished sufficiently (retreat ability) cannot be obtained, and the use performance is deteriorated.

  Therefore, there has been a demand for a hot water storage type hot water supply apparatus that has a reheating ability that can always be reheated even when the set temperature of the boiling start operation condition is relatively low, and that consumes less energy.

  An object of the present invention is to provide a hot water storage type hot water supply apparatus that consumes less energy for a reheating operation and can always retreat to a comfortable hot water temperature.

In order to solve the above-mentioned problem, a hot water storage type hot water supply apparatus according to claim 1 of the present invention includes a can body for storing hot water and a heat pump that heats the hot water in the lower part of the can and returns it to the upper layer part. A heating device of the type, a heat exchanger provided in the can for exchanging heat between the hot water storage hot water and the bathtub water of the bathtub, and connecting the heat exchanger and the bathtub to circulate the bathtub water of the bathtub A hot water storage hot water in the can body is boiled and stored in the heat pump type heating means at midnight , and the hot water stored in the hot water is used for hot water supply. In a hot water storage type hot water supply apparatus that performs reheating operation by circulating water to the heat exchanger by the bath circulation circuit, reheating storage means for storing reheating operation during a predetermined period, and the heat exchanger Arranged in the vicinity of Temperature detection means for detecting the hot water storage temperature in the body, reheating operation drive means for increasing the heating based on the hot water storage temperature detected by the temperature detection means, and whether or not the reheating operation of the reheating storage means is stored The heating start temperature correction means for correcting the start temperature of the boiling increase operation by the above, and the boiling increase operation when the hot water storage temperature detected by the temperature detection means becomes less than the temperature corrected by the boiling start temperature correction means. and a operation control means reheating to perform, the reheating start temperature correction means, the reheating storage means, when which has been stored in that the reheating operation, reheating said reheating storage means Compared to the case where the operation was not memorized, the boiling temperature was increased and the start temperature of the operation was increased, and the retreat storage means memorized that the retreat operation was performed. If no, characterized in that to lower the additional boiling initiation temperature operation as compared with the case which has been stored in that the reheating storage means has a firing operation to follow.
Here, the “predetermined period” is an arbitrary period set according to the use environment, for example, for a certain period (for example, one week) or after a hot water filling operation. is there.
Also, “whether or not there is a memory of the chasing operation” means that even if the chasing operation of the bath is performed even once by a chasing operation or an automatic warming operation during a predetermined period, it is memorized. Is “Yes”, otherwise it is “No”.

According to the first aspect of the present invention, the hot water storage type hot water supply apparatus detects the temperature when the reheating storage means has memorized that the reheating operation has been performed during the predetermined period, for example, once or more. According to the hot water storage temperature detected by the means, the reheating operation control means corrects the temperature at which the reheating operation starts to a preset temperature by the start temperature correction means, and then starts the reheating operation of the reheating operation drive means. To do.
In this way, by appropriately changing the start condition of the reheating operation depending on the presence or absence of memory of the reheating operation, for example, the reheating operation is performed and the hot water storage is performed by heat exchange with the bathtub water in the bathtub. When the hot water is deprived of heat and is in a state of insufficient heat, it can be heated up in advance to ensure the reheating ability.

A hot water storage type hot water supply apparatus according to claim 2 is the hot water storage type hot water supply apparatus according to claim 1, wherein the reheating storage means detects reheating operation within the predetermined period. The detection signal from the means is stored when the additional cooking determination circuit determines that the additional cooking operation is performed, and the additional detection means is provided in the bath circulation circuit, and the bath circulation is stored. Out of bath temperature sensor, bath return temperature sensor, reheating switch for detecting bath water flowing in the circuit, reheating switch for reheating bath water, bath circulation pump for circulating bath water in bath circulation circuit It is characterized by detecting the presence or absence of a signal from either of them and determining whether or not there is an additional cooking operation .

According to the second aspect of the present invention, the reheating detection means detects the presence / absence of a signal from any one of a bath temperature sensor, a bath return temperature sensor, a reheating switch, and a bath circulation pump. By determining whether or not the cooking operation is performed, it is possible to select an appropriate chase detecting means.

The hot water storage type hot water supply apparatus according to claim 3 is the hot water storage type hot water supply apparatus according to claim 2 , wherein the hot water storage type hot water supply apparatus is based on a signal from the reheating detection means. A recklessness judging means for determining the retreating time, and a retreating timer for measuring the time since the retreating operation is started, and the retreating timer starts when the refilling operation ends, When the driving time is not counted in the predetermined period after the chasing operation and the chasing operation is not performed, the chasing storage means stores that there is no chasing operation. And

According to the third aspect of the present invention, when there is no track record in the predetermined period counted by the tracking timer, it can be stored in the tracking memory means.

According to the hot-water storage type hot water supply apparatus according to the present onset bright, reheating operation control means, when the reheating storage means has stored the fact that the reheating operation during a predetermined period, detected by the temperature detecting means Based on the measured temperature, the temperature at which the heating operation driving means starts boiling operation is corrected to the appropriate temperature set in advance by the boiling start temperature correction means, and then the boiling operation is started. The temperature of hot water can be kept high. For this reason, the hot water storage hot water is not in a state of insufficient heat due to heat exchange with the bathtub water in the bathtub during the reheating operation, and the amount of heat in the hot water storage water is always so that the reheating operation can be performed quickly with the minimum energy. Can be stored and stored.
In addition, when the reheating storage means does not remember that the reheating storage means has performed reheating operation, the boiling increase operation control means secures a hot water storage temperature that can be used for hot water supply and maintains the use performance of the bath and hot water. Since the amount of hot water stored in the can can be saved and the hot water can be used efficiently, the electricity bill can be reduced.

Further, according to the hot water storage type hot water supply apparatus according to the present onset bright, reheating operation control means, for example, in the case of not storing in that the reheating operation within a predetermined period, the hot water storage temperature of the can body is If the temperature is lower than the first predetermined temperature (for example, 50 ° C.), the heating operation is started to secure the amount of heat necessary for replenishment to solve the shortage of heat, and always replenish efficiently with minimum energy. It is possible to drive.

Furthermore, according to the hot water storage type hot water supply apparatus according to the present onset bright, reheating operation control means, for example, in the case which has been stored in that the reheating operation within a predetermined period, the hot water storage temperature of the can body is first 2 If the temperature is lower than a predetermined temperature (for example, 60 ° C), start boiling-up operation to secure the amount of heat necessary for replenishment to eliminate the shortage of heat, and always replenish operation efficiently with minimum energy Can be ready.

Next, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic configuration diagram of a hot water storage type hot water supply apparatus according to the present invention. FIG. 2 is a block diagram showing a hot water storage type hot water supply apparatus according to the present invention.

≪Configuration of hot water storage type hot water supply system≫
As shown in FIG. 1, a hot water storage type hot water supply apparatus A heats hot water stored in a hot water storage tank (can) 11 provided with a heat exchanger 12 by a heating means 21, and bath water in a bathtub B is supplied to a bath circulation pump. 53 is a device provided with a function of recirculating operation by circulating the bath circulation circuit 5 at 53 and exchanging the bath water with the hot water stored in the heat exchanger 12. This hot water storage type hot water supply apparatus A is, for example, a so-called eco-cute (natural refrigerant heat pump type) that uses hot water stored in hot water to boil and store hot water in the midnight hours when the unit price of contracted electricity by time is low, and uses the stored hot water for hot water supply. Electric water heater).
The hot water storage type hot water supply apparatus A includes a heat pump unit (boiling operation drive means) 2 for heating the hot water stored in the hot water storage tank 11 and a hot water storage tank for chasing the bathtub water of the bathtub B with the hot water stored in the hot water storage tank 11. Set the unit 1, the hot water tap 3 that supplies hot water in the hot water storage tank 11 mixed with tap water to supply hot water, the bathtub B for storing bathtub water, the temperature of the bathtub water, etc. Or a remote control (hereinafter simply referred to as “remote control”) R for operating the hot water storage type hot water supply apparatus A.

This hot water storage type hot water supply apparatus A is provided in a hot water storage tank (can body) 11 for storing heated hot water, heating means 21 for heating the hot water in the hot water storage tank 11, and the hot water storage tank 11. The heat exchanger 12 for exchanging heat between the hot water storage hot water and the bath water of the bathtub B, the can body thermistor T1 for detecting the hot water temperature in the hot water storage tank 11, the heat exchanger 12 and the bathtub B are connected to A bath circulation circuit 5 for circulating the bathtub water of the bathtub B.
In addition to this, the hot water storage type hot water supply apparatus A is further disposed in the vicinity of a reheating storage circuit (reheating storage means) 84 for storing renewal operation during a predetermined period, and the heat exchanger 12, A can body thermistor (temperature detecting means) T1 for detecting the hot water storage temperature in the hot water storage tank (can body) 11 and a heat pump unit (boiling operation driving drive) for increasing boiling based on the hot water temperature detected by the can body thermistor T1. Means) 2, a correction circuit (boiling start temperature correcting means) 22e for correcting the start temperature of the reheating operation based on whether or not the reheating operation is stored in the reheating storage circuit 84, and the hot water storage temperature detected by the can body thermistor T1. Is provided with a heat pump control unit (boiling operation control means) 22 that performs a boiling operation when the temperature becomes lower than the temperature corrected by the correction circuit 22e.

≪Configuration of heat pump unit (driving operation drive means) ≫
As shown in FIG. 1, the heat pump unit 2 is a device that boils hot water, sends high temperature water to the upper layer portion in the hot water storage tank 11, and enters and circulates low temperature water in the lower layer portion in the hot water storage tank 11. The heat pump unit 2 includes, for example, a natural refrigerant heat pump, and performs boiling increase based on the hot water storage temperature detected by the can body thermistor (temperature detection means) T1. The heat pump unit 2 mainly includes a heating means 21, a heating circulation circuit 7, a refrigerant circulation circuit 20, and a heat pump control unit 22. Since the heat pump unit 2 uses carbon dioxide as a refrigerant, it can boil low temperature water to a high temperature of about 90 ° C. without an electric heater.

  The heat pump unit 2 corresponds to “boiling increase driving means” described in the claims. This boiling increase operation drive means is not limited to the heat pump unit 2, and may be an apparatus for boiling hot water using, for example, an oil vaporization type or gas type burner or an electric heater as the heating means 21.

<Configuration of heating means>
The heating means 21 of the heat pump unit 2 is for heating the low-temperature water in the lower layer in the hot water storage tank 11 into high-temperature water, and includes, for example, a refrigerant-water heat exchanger as a condenser. The heating means 21 employs a counter-flow type refrigerant-water heat exchanger in which the refrigerant and hot water in the hot water storage tank 11 as heated water flow in opposition to each other.

<Configuration of heating circuit>
As shown in FIG. 1, the heating circuit 7 draws the low temperature water in the lower layer of the hot water storage tank 11 into the heating means 21 and heats it to high temperature water, and returns this high temperature water to the upper layer of the hot water storage tank 11 for circulation. This is a circuit for raising the hot water storage temperature. The heating circulation circuit 7 includes a water inlet pipe 71, a hot water outlet pipe 72, a heating means 21, a heating circulation pump 23, a incoming water temperature sensor T3, a hot water temperature sensor T4, and a heat pump control unit that controls driving thereof. 22 mainly.

The water intake pipe 71 is a pipe for sending the low temperature water in the lower layer in the hot water storage tank 11 to the heating means 21, and one is connected to the lower end of the hot water storage tank 11 and the other is connected to the heating means 21.
The hot water discharge pipe 72 is a pipe for sending the high temperature water heated by the heating means 21 to the upper layer portion of the hot water storage tank 11, one of which is connected to the heating means 21 and the other is connected to the upper end of the hot water storage tank 11. .
The heating circulation pump 23 is a flow source for causing the water in the heating circulation circuit 7 to flow, and is interposed on the water inlet pipe 71. The heating circulation pump 23 is electrically connected to a heat pump control unit 22 described later (see FIG. 2).
The incoming water temperature sensor T <b> 3 is a sensor that detects the temperature of the low-temperature water drawn from the lower layer of the hot water storage tank 11, and is installed on the incoming water pipe 71. This incoming water temperature sensor T3 is electrically connected to the heat pump control unit 22 (see FIG. 2).
The hot water temperature sensor T <b> 4 is a sensor that detects the temperature of the high-temperature water sent from the heating means 21 to the hot water storage tank 11, and is installed on the hot water pipe 72. This hot water temperature sensor T4 is electrically connected to the heat pump controller 22 (see FIG. 2).

<Configuration of refrigerant circulation circuit>
The refrigerant circuit 20 uses natural refrigerant (for example, carbon dioxide), absorbs atmospheric heat with the evaporator 26, further compresses the refrigerant with the compressor 27 to a high temperature, and uses the refrigerant to heat the heating means 21. It is a circuit which comprises the critical heat pump cycle which heats and heats the water of the heating circulation circuit 7 to pass. The refrigerant circulation circuit 20 includes a heating means 21 that exchanges heat between the heat of the refrigerant and hot water flowing through the heating circulation circuit 7 to make high-temperature water (about 90 ° C.), an expansion valve 25 that is an electronic expansion valve, and air. An evaporator 26 composed of a forced air-cooled evaporator that absorbs heat and transfers it to a refrigerant, a compressor 27 for compressing the refrigerant to a high temperature (about 130 ° C.), and a refrigerant circulation pipe 24 connecting them respectively The heat pump control unit 22 is configured mainly to control the drive thereof.

<Configuration of heat pump controller (boiling operation control means)>
The heat pump control unit 22 increases the boiling point when the hot water storage temperature detected by the can thermistor (temperature detection means) T1 becomes less than the temperature corrected by the correction circuit (boiling start temperature correction means) 22e of the heat pump control unit 22. When the can body thermistor T1 detects a detected temperature lower than the first predetermined temperature and starts the boiling operation when the can body thermistor T1 detects a detected temperature lower than the first predetermined temperature, and when the can thermistor T1 detects a detected temperature lower than the second predetermined temperature This is a device having a function of starting up the operation. When heat exchange is performed by the heating means 21 of the refrigerant circulation circuit 20, the heat pump control unit 22 efficiently heats the water to be heated to a high temperature because the refrigerant is condensed in a supercritical state. In this way, the heat pump control unit 22 controls the expansion valve 25 or the compressor 27 so that the temperature difference between the inlet temperature of the heating means 21 of the water to be heated and the outlet temperature of the refrigerant becomes constant. Control is performed so that the water to be heated can be heated in a state in which (energy consumption efficiency) is good.

As shown in FIG. 2, the heat pump control unit 22 is supplied with electric power to each device of the heat pump unit 2 and the drive circuit 22 b for driving the heating circulation pump 23, the evaporator 26, and the compressor 27. Power supply circuit 22c, a heat pump storage circuit 22d storing various data for operating each device of the heat pump unit 2, and a correction circuit 22e for correcting the start condition of the heating operation to 50 ° C. or 60 ° C. And a microcomputer 22a for controlling those devices.
The heat pump control unit 22 corresponds to “boiling increase operation control means” described in the claims.

<Configuration of correction circuit (boiling start temperature correction means)>
The correction circuit 22e is an electric circuit that corrects the start temperature of the reheating operation depending on whether or not the reheating storage circuit (reheating storage means) 84 stores the reheating operation. This correction circuit 22e is used when the reheating detection means 50 has no track record in the predetermined period counted by the reheating timer 86 of the hot water supply control unit 8 and is not stored in the renewal storage circuit 84. In this case, the temperature at which the boiling operation is started is corrected so that the boiling operation is started when the detected temperature of the can thermistor T1 is less than 50 ° C.
In addition, the correction circuit 22e has a can thermistor when the reheating detection means 50 has a track record of reheating operation within a predetermined period counted by the reheating timer 86, and this is stored in the reheating storage circuit 84. When the detected temperature of T1 is less than 60 ° C., it is corrected so that the boiling operation is started.
The correction circuit 22e corresponds to “boiling start temperature correction means” described in the claims.
The 50 ° C. corresponds to a “first predetermined temperature” recited in the claims, and the 60 ° C. corresponds to a “second predetermined temperature”.

≪Configuration of hot water storage tank unit≫
As shown in FIG. 1, the hot water storage tank unit 1 is a device that uses hot water stored in a hot water storage tank 11 to recharge the bathtub water of the bathtub B, hot water is poured into the bathtub B, and is filled with water. is there. The hot water storage tank unit 1 includes a water supply circuit 4 for taking in tap water, a hot water storage tank 11 for temporarily storing hot water, a heat exchanger 12 disposed in the hot water storage tank 11, and a heat exchanger 12. The hot water heated by the heat pump unit 2 and the hot water supply circuit 6 for supplying hot water in the hot water storage tank 11 to the hot water tap 3 or the hot tub B, and the hot water heated in the heat pump unit 2 The heating circulation circuit 7 for sending to the hot water storage tank 11 is mainly comprised.

<Configuration of water supply circuit>
The water supply circuit 4 is a circuit for drawing and supplying tap water to the hot water storage tank 11 and the hot water supply mixing valve V3. The water supply circuit 4 includes a water supply pipe 41, a water supply temperature sensor T5, a pressure reducing valve V1, and a water supply bypass pipe 42.
The water supply pipe 41 is connected to the lower end of the hot water storage tank 11 via a pressure reducing valve V1 that reduces the pressure of the water supply. The water supply pipe 41 is provided with a water supply temperature sensor T5 that detects the temperature of the low-temperature water supplied through the water supply pipe 41.
One end of the water supply bypass pipe 42 is branched and connected from the water supply pipe 41, and the other end is connected to the hot water supply mixing valve V3.

<Configuration of hot water storage tank (can body)>
As shown in FIG. 1, the hot water storage tank 11 temporarily stores high-temperature water boiled by the heat pump unit 2 and heat-exchanged by the heat exchanger 12 in the upper layer portion, and supplied from the water supply pipe 41 to the lower layer portion. This is a tank for temporarily storing the generated low-temperature water. In the hot water storage tank 11, the low-temperature water in the lower layer is taken out from the water inlet pipe 71 by the heat pump unit 2, boiled up and returned to the upper layer in the hot water tank 11 from the hot water pipe 72. While the hot water was stored, the low temperature water in the hot water storage tank 11 pushed up the high temperature water in the upper layer of the hot water storage tank 11 by the tap water supplied from the water supply pipe 41, and the high temperature water and the low temperature water were mixed and became appropriate temperature. Hot water is discharged from the hot water supply pipe 61.
The hot water storage tank 11 is provided with a can body thermistor T1, a hot water storage temperature sensor T2, and a heat exchanger 12, a water supply pipe 41 and a water inlet pipe 71 are provided at the lower end, and a bath forward pipe 5a and a bath return path are provided at the upper end. A pipe 5b is connected, and a hot water supply pipe 61 and a hot water discharge pipe 72 are connected to the upper end.
The hot water storage tank 11 corresponds to a “can” described in the claims.

<Configuration of can body thermistor (temperature detection means)>
The can body thermistor T <b> 1 is a temperature detector for detecting the temperature of the hot water flowing through the upper layer in the hot water storage tank 11, and is installed in the vicinity of the heat exchanger 12 in the hot water storage tank 11. The can body thermistor T1 is electrically connected to the hot water supply control unit 8 (see FIG. 2).
In addition, this can body thermistor T1 is corresponded to the "temperature detection means" as described in a claim. This temperature detection means may be a hot water storage temperature sensor T2 installed in the vicinity of the heat exchanger 12 in the hot water storage tank 11 or at a position indicating a predetermined hot water storage amount.

<Configuration of hot water storage temperature sensor (temperature detection means)>
The hot water storage temperature sensor T2 is a temperature detector for detecting the hot water temperature of each layer of the hot water storage tank 11, and a plurality of hot water storage temperature sensors T2 are installed in the vertical direction for each predetermined hot water storage amount from the lower layer to the upper layer in the hot water storage tank 11. Being done. The hot water storage temperature sensor T2 is electrically connected to the hot water supply control unit 8 (see FIG. 2).
Note that the hot water supply control unit 8 uses the hot water temperature information detected by each hot water storage temperature sensor T2 to boil high temperature water in the upper layer portion of the hot water storage tank 11 and low temperature before the lower layer portion in the hot water storage tank 11 is heated. It is configured to detect how much hot water remains above the temperature boundary position with water, and to detect the vertical temperature distribution in the hot water storage tank 11.

<Configuration of heat exchanger>
The heat exchanger 12 heats the bathtub water in the bathtub B by exchanging heat with the high-temperature water in the upper layer portion of the hot water storage tank 11, and is made of, for example, a stainless steel serpentine tube. Installed in the department. One of the heat exchangers 12 is connected to the bath forward pipe 5a, the other is connected to the bath return pipe 5b, the bath water in the bathtub B is circulated by the bath circulation circuit 5, and the bath water in the bathtub B is stored as hot water. The tank 11 is heated by high-temperature water in the tank 11 so as to be kept warm and refilled.

<Configuration of bath circulation circuit>
As shown in FIG. 1, the bath circulation circuit 5 is a bath for sending bathtub water heated at the heat exchanger 12 with one end connected to the heat exchanger 12 and the other end connected to the bathtub B to the bathtub B. The forward path pipe 5a and the bath return path pipe 5b that has one end connected to the bathtub B and the other end connected to the heat exchanger 12 to send the bathtub water of the bathtub B to the heat exchanger 12. The bath circulation circuit 5 is provided with a reheating detection means 50.
The bath going pipe 5a is provided with a bath going temperature sensor 51 that detects the temperature of the bath water in the bath going pipe 5a that flows out of the heat exchanger 18 and flows into the bathtub B.
The bath return pipe 5b includes a water level sensor G that detects the water level (amount of hot water) in the bathtub B to prevent emptying, and a bath circulation pump for circulating the bath water in the bathtub B to the bath circulation circuit 5 53 and a bath return temperature sensor 52 for detecting the temperature of the bath water in the bath return pipe 5b flowing into the heat exchanger 18 are provided.
The bath temperature sensor 51, the water level sensor G, the bath circulation pump 53, and the bath return temperature sensor 52 are each electrically connected to the hot water supply control unit 8 (see FIG. 2).

<Composition of bathtub>
The bathtub B is for storing bathtub water, and is configured such that the bath forward pipe 5 a and the bath return pipe 5 b of the bath circulation circuit 5 are connected to circulate the bath water in the bath circulation circuit 5. .

<Configuration of repulse detection means>
The chasing detection means 50 only needs to detect the chasing operation during a predetermined period. For example, the chasing operation is detected by detecting a change in the temperature of the bath water flowing through the bath circulation circuit 5. And a bath return temperature sensor 51 for detecting whether or not the bath has been performed, a bath return temperature sensor 52, and the like. For example, the detection signal (resistance) of the reheating operation detected by the bath temperature sensor 51 or the bath return temperature sensor 52 (recovery detection means 50) is sent to the revocation determination circuit 87 to be reheating operation. Is determined and it is determined by the heat exchanger 12 that the reheating operation is such that the bath water rises, the reheating storage circuit 84 of the heat pump unit 2 stores the renewal operation “present”. Yes.
The reheating detection unit 50 may detect the presence or absence of reheating operation depending on whether or not the bath circulation pump 53 is driven. Further, the presence / absence of a reheating operation command signal when the reheating switch Rd is turned on may be used.

<Configuration of hot water supply circuit>
As shown in FIG. 1, the hot water supply circuit 6 is a circuit for sending hot water stored in the upper layer portion of the hot water storage tank 11 to the hot water tap 3 via the hot water mixing valve 29. The hot water supply circuit 6 includes a hot water supply pipe 61, an overpressure relief valve V 2, a mixed hot water supply pipe 62, a hot water supply mixing valve V 3, a hot water supply flow meter C 1, a hot water supply temperature sensor T 6, and a hot water tap 3. ing.
One end of the hot water supply pipe 61 is connected to the upper end of the hot water storage tank 11, and the other end is connected to the hot water supply mixing valve V3. The hot water supply pipe 61 has an overpressure for discharging hot water to the outside and adjusting the internal pressure so that the hot water storage tank 11 and the like are not damaged when the pressure in the hot water supply pipe 61 and the hot water storage tank 11 is high. A relief valve V2 is provided.
One end of the mixed hot water supply pipe 62 is connected to the hot water supply mixing valve V3, the other end is connected to the hot water supply tap 3, and a hot water supply flow meter C1 for measuring the flow rate of hot water flowing through the mixed hot water supply pipe 62 is interposed in the middle portion thereof. Has been. The mixed hot water supply pipe 62 is provided with a hot water supply temperature sensor T6 for detecting the temperature of the hot water flowing through the mixed hot water supply pipe 62.

  The hot water supply mixing valve V3 is a three-way valve composed of an electric mixing valve or the like that mixes hot water storage hot water from the hot water supply pipe 61 and low temperature water from the water supply bypass pipe 42, and a hot water supply temperature sensor provided in the mixed hot water supply pipe 62 downstream thereof. The mixing ratio is controlled so that the hot water temperature detected at T6 becomes the hot water supply set temperature set by the user with the remote controller R. The hot water supply mixing valve V3 is electrically connected to the hot water supply control unit 8 (see FIG. 2).

<Composition of hot water tap>
The hot-water tap 3 is adjusted to a set temperature by mixing the low-temperature water from the water supply pipe 41 described later and the high-temperature water heated by the heat exchanger 12 and from the hot water supply pipe 61 of the hot water supply circuit 6 with the hot water supply mixing valve 29. It is a faucet for hot water supply for discharging hot water, and is connected to the mixed hot water supply pipe 62 by a curan or a shower faucet installed in a bathroom, for example. The hot-water tap 3 may be a water tap arranged in a kitchen or a washroom.

<Configuration of hot water filling circuit>
The hot water filling circuit 9 is a circuit for pouring hot water adjusted to a set temperature by the hot water supply mixing valve V3 into the bath return pipe 5b of the bath circulation circuit 5 to fill the bathtub B with hot water. The hot water filling circuit 9 includes a hot water filling pipe 91, a hot water filling valve V4, a bath flow meter C2, and a check valve V5.
One end of the hot water filling pipe 91 is connected to a branch point of the mixed hot water supply pipe 62 between the hot water supply flow meter C 1 and the hot water tap 3, and the other end is a bath return path between the bath circulation pump 53 and the bath return temperature sensor 52. It is connected to and communicates with the tube 5b.
The hot water filling valve V4 is an electromagnetic valve that starts / stops hot water filling to the bathtub B by opening and closing the valve body, and is electrically connected to the hot water supply control unit 8 (see FIG. 2).
The bath flow meter C2 is a flow meter that counts the amount of hot water flowing from the hot water filling pipe 91 through the bath circulation circuit 5 into the bathtub B, and is electrically connected to the hot water supply control unit 8 (see FIG. 2). .
The check valve V <b> 5 is a valve for preventing the bath water in the bath circulation circuit 5 from flowing back to the mixed hot water supply pipe 62 due to water cut or the like.

<Configuration of hot water supply control unit>
As shown in FIG. 2, the hot water supply control unit 8 is a control unit that includes a microcomputer 81 that receives input from each sensor in the hot water storage tank unit 1 and controls driving of each actuator. A remote controller R is connected to the hot water supply control unit 8 wirelessly or by wire so that the user can set an arbitrary hot water supply set temperature and bath set temperature.
The hot water supply control unit 8 includes a drive circuit 82 for driving the bath circulation pump 53, the hot water supply mixing valve V3, the hot water filling valve V4, and the like, a power supply circuit 83 for supplying electric power to each device of the hot water storage tank unit 1, A hot water filling timer 85 that measures the time since the hot water filling operation is performed, a reheating determination circuit 87 that determines the presence or absence of the reheating operation based on a signal from the reheating detection means 50, and a reheating operation. The reheating timer 86 for measuring the time (predetermined period) after the reheating, the reheating storage circuit 84 for storing the recirculation operation during the predetermined period in the bath circulation circuit 5, and the hot water tank unit 1 The hot water storage circuit 88 which memorize | stores the various data for operating this, and the microcomputer 81 for controlling those apparatuses are provided.
The chasing memory circuit 84 corresponds to “challing memory means” recited in the claims.

≪Configuration of remote control≫
The remote control R is a device for remotely operating the hot water storage type hot water supply apparatus A, and is an operating device for manually setting the hot water supply temperature, the temperature of the bathtub water, the amount of hot water filling, etc. Each one is installed. The remote control R includes a hot water supply temperature setting switch Ra for setting the hot water supply set temperature, a bath temperature setting switch Rb for setting the bath set temperature, and a hot water amount setting switch ( A bath automatic switch Rc that fills the bath with the amount of water set in step (not shown) and keeps it warm for a predetermined time; a reheating switch Rd that replenishes the bath water; And Rf, which are electrically connected to the remote controller Rg (see FIG. 2).

≪Operation of hot water storage hot water supply system≫
Next, the operation of the hot water storage type hot water supply apparatus A according to the present invention will be described with reference mainly to FIG.
For example, the hot water supply control unit 8 shown in FIG. 1 uses the microcomputer 81 (see FIG. 2) if the necessary amount of heat does not remain in the hot water storage tank 11 in the hot water storage tank 11 from the hot water storage temperature detected by the hot water storage temperature sensor T2 during the midnight power hours. ) Is issued, a command to start the boiling operation is issued to the heat pump control unit 22, and the heat pump control unit 22 drives each device of the heat pump unit 2.
The heat pump controller 22 starts driving the heating circulation pump 23 after starting the compressor 27, and heats the low-temperature water of about 5 to 20 ° C. taken out from the water inlet pipe 71 connected to the lower end of the hot water storage tank 11. The hot water is heated to a high temperature of about 70 to 90 ° C., returned to the upper layer in the hot water storage tank 11 from the hot water discharge pipe 72, and sequentially stacked from the upper end of the hot water storage tank 11 to store the high temperature water.
When each hot water storage temperature sensor T2 detects that the amount of heat necessary for reheating or hot water supply has been stored, the hot water supply control unit 8 issues a boiling stop command to the heat pump control unit 22 to stop the compressor 27 At the same time, the circulating pump for heating 23 is also stopped to end the boiling operation.

Next, the hot water supply operation will be described.
When the hot-water tap 3 shown in FIG. 1 is opened, cold / hot water is supplied from the water supply pipe 41 and flows from the lower end in the hot water storage tank 11. Then, the hot water stored in the upper layer portion of the hot water storage tank 11 is pushed out by the cold and hot water, flows into the hot water supply mixing valve V3 through the hot water supply pipe 61, and is mixed with the low temperature water from the hot water supply bypass pipe 42. The control unit 8 adjusts the mixing ratio of the hot water supply mixing valve V <b> 3, and hot water at the hot water supply set temperature is supplied from the hot water tap 3. Then, the hot water supply is completed by closing the hot water tap 3.

FIG. 3 is a flowchart showing a hot water filling operation and a reheating operation by the hot water storage type hot water supply apparatus according to the present invention.
Next, the hot water filling operation to the bathtub B will be described with reference mainly to FIG.
When the bath automatic switch Rc of the remote control R located outside the bathroom is operated, the hot water supply control unit 8 opens the hot water filling valve V4 and starts the hot water filling operation (step S1).
That is, the tap water supplied from the water supply pipe 41 flows into the lower end of the hot water storage tank 11, and the high temperature water in the upper layer in the hot water storage tank 11 is pushed out by the tap water to the hot water mixing valve V3. Flowing. The hot water mixed with the low temperature water from the water supply bypass pipe 42 by the hot water supply mixing valve V3 and adjusted to the bath set temperature is supplied from the hot water pipe 91 to the bathtub B through the bath return pipe 5b and the bath forward pipe 5a. It is stretched. At this time, the bath flow meter C2 provided in the middle of the hot water tube 91 monitors whether the amount of hot water flowing through the hot water tube 91 is set (step S2) (No in step S2), a predetermined amount. When the amount of hot water filling is counted (Yes in step S3), the hot water supply control unit 8 closes the hot water filling valve V4 and ends the hot water filling operation (step S3). Then, the end of hot water filling is notified by a melody sound and voice from a speaker (not shown).

Next, the chasing operation of the bath will be described.
When the microcomputer 81 of the hot water supply control unit 8 determines that the hot water filling operation is ended based on the closed valve signal from the hot water filling valve V4, the hot water filling timer 85 is turned on (started), and the bathtub water of the bathtub B is set. The temperature keeping operation is started to keep the temperature at the set temperature set by the remote controller R (step S4).

Then, the microcomputer 81 determines whether the bath water temperature is lower than a preset temperature by using the bath temperature sensor 51 or a bath water temperature sensor (not shown) that detects the temperature of the bath water in the bath B ( Step S5).
When the bath water temperature is equal to or higher than the set temperature (No in step S5), the microcomputer 81 sets the bath water in the bath B to the set hot water according to the temperature detection signal from the bath temperature sensor 51 or the bath water temperature sensor. Monitoring is continued until the temperature falls below the temperature (No in step S5 and step S5).

On the other hand, when the bath water temperature is lower than the set temperature (Yes in step S5), the microcomputer 22a of the heat pump controller (boiling operation control means) 22 activates the hot water timer 85 or the reheating timer 86. After that, it is determined whether or not the driving operation is performed within a predetermined period, and the result of the driving operation is stored in the driving and storage circuit 84 (step S6).
At this time, if the heat pump control unit 22 determines that there is no memory of the reheating operation in the reheating storage circuit 84 and there is no track record of the reheating operation, the heat pump 12 of the hot water storage tank 11 where the heat exchanger 12 is located. Since hot water storage hot water having a sufficient amount of heat that can be used for reheating operation remains in the upper layer part, when the detection temperature of the can body thermistor T1 is detected to be less than 50 ° C., the reheating operation is started. The start condition is switched and corrected by the correction circuit (boiling start temperature correction means) 22e (see FIG. 2) (step S7).

  When the heat pump control unit 22 determines that the memory of the reheating operation is stored in the reheating storage circuit 84 and has a track record of the reheating operation, the hot water stored in the hot water is exchanged with the bath water. In order to ensure the amount of heat required for the reheating operation due to the shortage, the correction circuit is configured to start the reheating operation when the detected temperature of the can body thermistor T1 is detected to be less than 60 ° C. The start condition is switched and corrected by 22e (see FIG. 2) (step S8).

  In this way, by appropriately changing the start condition of the reheating operation according to the presence or absence of the memory of the reheating operation, for example, the reheating operation is performed and heat exchange with the bath water in the bathtub B is performed. When the hot water storage hot water is deprived of heat and is in a state of insufficient heat, the hot water storage hot water can be given heat so that it can be reheated and operated continuously.

  If the reheating storage circuit 84 does not store the reheating operation within the predetermined period, the microcomputer 22a of the heat pump control unit 22 uses the can body thermistor T1 provided in the vicinity of the heat exchanger 12. It is monitored whether or not the detected hot water storage temperature of the hot water storage tank 11 has dropped below a predetermined temperature (50 ° C.) (No in step S9). And if it becomes less than predetermined temperature (50 degreeC) (Yes of step S9), since the hot water storage temperature in the hot water storage tank 11 falls and the start conditions of a reheating operation are satisfy | filled, the circulating pump 23 for heating is driven. The boiling increase operation is started (step S11).

  On the other hand, when the reheating operation is performed within a predetermined period and the reheating operation is stored in the reheating storage circuit 84, the microcomputer 22a of the heat pump control unit 22 is provided in the vicinity of the heat exchanger 12. It is monitored whether the hot water storage temperature of the hot water storage tank 11 detected by the can body thermistor T1 falls below a predetermined temperature (60 ° C.) (No in step S10). And if it becomes less than predetermined temperature (60 degreeC) (Yes of step S9), since the hot water storage temperature in the hot water storage tank 11 falls and the start condition is satisfy | filled, the circulation pump 23 for heating is driven and a boiling increase operation is carried out. Is started (step S11).

When the heating circulation pump 23 is driven and the boiling operation is started, the hot water in the heating circuit 7 flows, and the low-temperature water in the lower layer in the hot water storage tank 11 is drawn into the heating means 21 from the inlet pipe 71. Then, the heat is exchanged to form high-temperature water, which is sent from the hot water discharge pipe 72 to the upper layer in the hot water storage tank 11.
The hot water storage temperature in the hot water storage tank 11 rises as high temperature water flows in, and the hot water storage temperature of the entire hot water storage tank 11 is detected by each hot water storage temperature sensor T2. The heat pump control unit 22 monitors whether the hot water storage temperature detected by each hot water storage temperature sensor T2 has reached an appropriate temperature that is equal to or higher than the set hot water temperature (step S12), and if it is equal to or higher than the set hot water temperature (Yes in step S12). ), The hot water storage amount at the predetermined temperature is determined to have reached the predetermined amount, the heating circulation pump 23 is stopped and the boiling operation is ended (step S13). If the hot water storage temperature is lower than the set hot water storage temperature (No in step S12) ), The heating circulation pump 23 is continuously driven, and the boiling operation is continued until the set hot water storage temperature is reached.

  Then, when the hot water storage temperature in the hot water storage tank 11 rises to the set hot water storage temperature, the hot water supply control unit 8 has the amount of heat necessary for the additional cooking operation, and starts to drive the bath circulation pump 53 to start the additional cooking operation (step) S14). When the bath circulation pump 53 is driven, the bath water in the bathtub B is drawn into the bath return pipe 5b and exchanges heat with the hot water in the hot water storage tank 11 by the heat exchanger 12, and returns to the bathtub B from the bath forward pipe 5a. Circulates through the bath circulation circuit 5 and is chased away.

  In the hot water supply control unit 8, whether the bath return temperature (bath water temperature) has been retreated above the target retreat temperature stored in the retreat storage circuit 84 by the bath reversion temperature sensor 52 after the retreat operation is started. Is monitored (No in step S15, step 15).

In the reheating operation, when the temperature detected by the bath return temperature sensor 52 rises to the reheating target temperature (Yes in step S15), the hot water supply control unit 8 stops driving the bath circulation pump 53 and reheats. The operation is terminated (step S16), and the reheating timer 86 is turned on (started) (step S17).
By the reheating timer 86, the reheating time after the reheating operation is counted, and the start condition of the reheating operation is reset to 60 ° C. again in the step S6. This eliminates the fact that the stored hot water temperature drops below a predetermined temperature.
In addition, when the reheating operation is also performed, the reheating operation may be ended simultaneously with the end of the reheating operation.

  In this way, the temperature of the bath water in the bath B is set to the above-described steps S5 to 18 so that the bath automatic switch Rc is not turned off (No in step S18) so as to be kept at the set hot water temperature of the bath. It is incremented and always kept at an appropriate temperature.

  As described above, the hot water storage type hot water supply apparatus A sets the start condition for the reheating operation depending on whether or not the reheating operation is performed, and the hot water storage temperature in the hot water storage tank 11 is less than 50 ° C. or less than 60 ° C. Either way, by starting the reheating operation, the amount of heat necessary for the reheating operation can always be secured, and the situation where the heat amount is insufficient during the reheating operation is solved. For this reason, when performing the reheating operation, the reheating capability capable of completing the reheating operation in a short time is always ensured.

  In the case of reheating operation, boiling is performed based on the temperature detected by the can body thermistor T1 disposed in the vicinity of the heat exchanger 12 for exchanging heat between the bathtub water in the bathtub B and the hot water stored in the hot water storage tank 11. Since the additional operation is started, it is possible to more accurately determine the possibility of insufficient heat quantity using the temperature drop at the beginning of the reheating operation.

  The present invention is not limited to the above-described embodiment, and various modifications and changes can be made within the scope of the technical idea. The present invention extends to these modifications and changes. Of course.

For example, in the hot water storage type hot water supply apparatus A according to the embodiment of the present invention, as a means for heating the hot water in the hot water storage tank 11, the case where the heat pump unit 2 is used has been described as an example. An electric heater or a burner may be used.
Moreover, although the heat exchanger 12 demonstrated and demonstrated the example provided in the upper layer part in the hot water storage tank 11, it is not limited to one, For example, it is provided also in the lower layer part of the hot water storage tank 11, etc. There may be more than one.

1 is a schematic configuration diagram of a hot water storage type hot water supply apparatus according to the present invention. It is a block diagram which shows the hot water storage type hot water supply apparatus which concerns on this invention. It is a flowchart which shows the filling operation and the reheating operation by the hot water storage type hot water supply apparatus which concerns on this invention.

Explanation of symbols

1 Hot water storage tank unit 2 Heat pump unit (driving operation driving means)
5 Bath circulation circuit 8 Hot water supply controller 11 Hot water storage tank (can)
12 Heat exchanger 21 Heating means 22 Heat pump controller (boiling operation control means)
22d Heat pump memory circuit 22e Correction circuit (boiling start temperature correction means)
50 Rebirth detection means 84 Rebirth storage circuit (rebirth storage means)
85 Hot water filling timer 86 Reheating timer A Hot water storage type hot water supply device B Bathtub T1 Can body thermistor (temperature detection means)
T2 Hot water storage temperature sensor (temperature detection means)

Claims (3)

Heat exchange between a can for storing hot water, a heat pump type heating means for heating the hot water of the lower layer in the can and returning it to the upper layer, and the hot water stored in the can and the bathtub water in the bathtub A heat exchanger that connects the heat exchanger and the bathtub, and a bath circulation circuit for circulating the bathtub water of the bathtub,
Boiling hot water in the can body is boiled and stored in the can body by the heat pump type heating means at midnight, and the hot water stored in the can is used for hot water supply, and the bathtub water in the bathtub is exchanged by the bath circulation circuit. In a hot water storage type hot water supply device that circulates in a vessel and performs a reheating operation
Rebirth storage means for memorizing that rebirth driving during a predetermined period;
A temperature detecting means disposed in the vicinity of the heat exchanger for detecting the hot water storage temperature in the can;
Boiling operation driving means for increasing boiling based on the hot water storage temperature detected by the temperature detecting means,
Reheating start temperature correction means for correcting the start temperature of reheating operation depending on whether or not reheating operation is stored in the reheating storage means;
And a reheating operation control means for reheating performed operation when it becomes less than the corrected temperature by starting temperature correction means increases boiling the hot water storage temperature the temperature detecting means detects that,
The boiling increase start temperature correcting means, when the reheating storage means has memorized that the reheating operation has been stored, and when the reheating storage means has not memorized that the reheating operation has been performed. In comparison, when the start-up temperature of the reheating operation is increased and the reheating storage means does not remember that the reheating operation has been performed, the reheating storage means stores the renewal operation. A hot water storage type hot water supply apparatus characterized by lowering the starting temperature of the reheating operation as compared with the case of the hot water. The rebirth storage means performs a rebirth operation when the rebirth detection circuit detects that the rebirth operation has been performed by the rebirth detection circuit that detects that the rebirth operation has been performed within the predetermined period. Is remembered,
The reheating detection means is provided in the bath circulation circuit and detects a rising change in the temperature of bath water flowing through the bath circulation circuit, a bath return temperature sensor, a bath return temperature sensor, and reheating bath water. 2. The hot water storage system according to claim 1, wherein the presence or absence of a signal from any one of a reheating switch and a bath circulation pump that circulates bathtub water in the bath circulation circuit is detected to determine whether or not a reheating operation is performed. Hot water supply device. The hot water storage type hot water supply apparatus is a reheating determination unit that determines the presence or absence of the reheating operation based on a signal from the reheating detection unit;
A reheating timer that measures the time since the reheating operation,
The chasing timer starts when the chasing operation ends, counts the chasing time after the chasing operation, and the chasing operation is not performed within a predetermined period after the chasing operation The hot water storage type hot water supply apparatus according to claim 2 , wherein the reheating storage means stores that there was no reheating operation .

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