JP4448488B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus having a hot water storage tank for storing hot water for hot water supply heated by a heating operation of a heating means, and having an operation mode for performing an efficient boiling operation without causing hot water shortage.

  In the conventional hot water storage type hot water supply system, during the midnight hours when electricity charges are the cheapest, hot water is boiled by heating means and stored in a hot water storage tank, and this hot water is used for hot water supply. )It has been known.

  In such a heat pump hot water supply device, when boiling hot water in a hot water storage tank is boiled, for example, the heating operation is performed by a heating means having a rated output of 4.5 KW or the like. In the hot water storage type hot water supply device, when the amount of hot water stored in the hot water storage tank falls below a predetermined amount, the control means starts the heating operation, and when the amount of hot water stored in the hot water storage tank reaches a predetermined amount or more, the control means starts the heating operation. I try to stop.

However, in such a hot water storage type hot water supply device, for example, when there is little hot water to be used from morning to midnight and surplus hot water remains at the start of midnight operation, heat dissipation in the unused period after the evening is wasted. It becomes.
On the other hand, if the amount of hot water used is large and the hot water in the hot water storage tank is used up by the evening, there is a problem that the hot water runs out in the evening or at night.

As a hot water storage type hot water supply device for solving such problems, since the amount of hot water used is large, in order to obtain a relatively large amount of hot water in a short time, in addition to the rated output operation mode where boiling is performed at a normal output. A device having a manual and powerful operation mode that can be rapidly heated is known (see, for example, Patent Document 1).
JP 2005-241085 A (Claims, FIGS. 1 and 2)

However, in the hot water storage type hot water supply apparatus of Patent Document 1, when the user wants to quickly boil, the remote control is operated to manually switch from the rated output operation mode to the powerful operation mode. For this reason, even when hot water is likely to run out, perform boiling operation in the rated output operation mode at a constant output, or perform powerful operation to maintain the boiling temperature regardless of the hot water storage temperature in the hot water storage tank. Was.
As a result, there may be shortage of hot water storage such as shortage of boiling start amount (minimum hot water storage amount), lack of heat for bathing, or shortage of reheating bath. Was desired.

  Therefore, the present invention has been made to solve the problems of the prior art, and it is possible to improve the supply efficiency of hot water and secure a hot water storage amount corresponding to the amount of hot water used without causing hot water to run out. The object is to provide a hot water storage type hot water supply device that can be used.

In order to solve the above-mentioned problem, a hot water storage type hot water supply apparatus according to claim 1 has a hot water storage tank for storing hot water and a plurality of boiling operation modes according to the ability to boil hot water in the hot water storage tank. In the hot water storage type hot water supply apparatus provided with a heating means for performing a boiling operation, the heating means includes a rated output operation mode for performing a boiling operation at a set normal output, and an output larger than an output of the rated output operation mode. In the speed operation mode that heats up to the first set temperature and the second set temperature that is higher than the first set temperature, the powerful operation mode that heats up with the output that is larger than the output of the rated output operation mode and smaller than the speed operation mode And.
Here, the “first set temperature” is an arbitrary boiling temperature of hot water required for hot water supply or the like, and is, for example, 65 ° C. which is the minimum required temperature. The “second set temperature” is an arbitrary temperature higher than the first set temperature, and is, for example, 65 ° C. to 90 ° C.

According to the first aspect of the present invention, when the amount of hot water used by the user is a normal amount of hot water used, the boiling operation is performed up to the temperature set in the rated output operation mode (for example, 4.5 kw). To do.
When the amount of hot water used is large and the temperature is raised to a first set temperature (for example, 65 ° C.) that is higher than this temperature to prevent hot water from running out, the maximum output (for example, 8 kW) that is greater than the output in the rated output operation mode. Boil up quickly in the speed operation mode.
Further, when a second set temperature higher than the first set temperature (for example, 85 ° C.) is desired, a powerful operation mode in which boiling is performed at an output (for example, 6 kw) that is larger than the output of the rated output operation mode and smaller than the speed mode. And boil.

  The 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 first set temperature is fixed to a set temperature, and the second set temperature is the first temperature. The setting can be changed from the set temperature to a settable upper limit temperature.

  According to the second aspect of the present invention, the second set temperature is appropriately set to a temperature between the first set temperature and a settable upper limit temperature according to the amount of hot water used by the user. Therefore, if the amount of hot water used is large, the temperature is set to a high temperature, and if the amount of hot water used is small, the temperature is set to a low temperature, so that a hot water storage amount suitable for the amount of hot water used by the user can be secured.

The hot water storage type hot water supply apparatus according to claim 3 is a hot water storage tank for storing hot water, hot water storage temperature detecting means for detecting a hot water storage temperature in an upper layer of the hot water storage tank, and hot water storage of the hot water stored in the hot water storage tank. A hot water storage amount detecting means for detecting the amount, a heating means for performing a boiling operation in a plurality of boiling operation modes according to the ability to boil hot water in the hot water storage tank, and a control means for controlling the heating means. In the hot water storage type hot water supply apparatus provided, the heating means includes a rated output operation mode in which boiling operation is performed at a set normal output, a powerful operation mode in which boiling is performed at an output larger than the output of the rated output operation mode, and the powerful operation mode. A speed operation mode in which boiling is performed with an output larger than the output of the operation mode, and the control means has a temperature detected by the hot water storage temperature detection means equal to or higher than a predetermined temperature. The when the amount of hot water storage by hot water storage amount detecting means detects more than a predetermined amount of hot water storage, storage-type water heater, characterized in that to heating operation the heating means in the rated operation mode.
Here, the “predetermined temperature” is an arbitrary hot water storage temperature necessary for supplying hot water, and is, for example, the minimum required temperature of 65 ° C. The “predetermined hot water storage amount” is an arbitrary hot water storage amount that is insufficient for hot water supply, for example, 30 liters.

  According to the third aspect of the invention, when the hot water storage temperature is equal to or higher than the first predetermined temperature and the hot water storage amount is detected to be equal to or higher than the predetermined hot water storage amount, the amount of hot water used is the normal hot water amount. Boiling operation is performed to secure the amount of hot water stored.

  A hot water storage type hot water supply device according to claim 4 is the hot water storage type hot water supply device according to claim 3, wherein the control means detects the amount of hot water stored when the temperature detected by the hot water storage temperature detection means is not more than a predetermined temperature. When the shortage of hot water storage is detected by the means, the heating means is operated to boil up in the speed operation mode.

According to the fourth aspect of the present invention, when the hot water storage temperature is a predetermined temperature (for example, 65 ° C.) or less and the amount of stored hot water is insufficient, the boiling operation is performed with the output of the speed operation mode (for example, 8 kw). By doing so, it becomes possible to cope with a shortage of low-temperature water and hot water storage by boiling up to 65 ° C., for example, at the maximum output.
Here, the shortage of hot water storage means that it falls below an arbitrary hot water storage amount required for hot water supply or the like, for example, 30 liters which is the minimum required hot water storage amount.

  The hot water storage type hot water supply apparatus according to claim 5 is the hot water storage type hot water supply apparatus according to claim 3 or claim 4, wherein the temperature detected by the hot water storage temperature detection means is equal to or higher than a predetermined temperature. When the hot water storage amount detecting means detects that the hot water storage is insufficient, the heating means is operated to boil up in the powerful operation mode.

  According to the fifth aspect of the present invention, when the hot water storage temperature is equal to or higher than a predetermined temperature (for example, 65 ° C.) and the amount of stored hot water is insufficient, the boiling operation is performed with the output of the powerful operation mode (for example, 6 kw). By boiling, the water is boiled up to 85 ° C., for example, with a large output.

  The hot water storage type hot water supply apparatus according to claim 6 is the hot water storage type hot water supply apparatus according to claim 4, wherein the temperature detected by the hot water storage temperature detection means is a predetermined temperature during the speed operation mode. As described above, when the hot water storage amount detecting means detects a hot water storage amount greater than or equal to a predetermined hot water storage amount, the heating means is switched to the powerful operation mode, and the temperature detected by the hot water storage temperature detection means is equal to or higher than a predetermined temperature, or The heating means is switched to the rated operation mode when the hot water storage amount detected by the hot water storage amount detection means is greater than or equal to a predetermined hot water storage amount.

According to the invention described in claim 6, when the hot water storage temperature is equal to or higher than the predetermined temperature and the hot water storage amount is equal to or higher than the predetermined hot water storage amount during the boiling operation in the speed operation mode, the hot water amount close to the minimum required hot water storage amount. Therefore, the operation is switched to the powerful operation mode, the output is lowered, and the boiling operation is performed.
When the hot water storage temperature is higher than the predetermined temperature or the hot water storage amount is higher than the predetermined hot water storage amount, the output is switched to the rated output operation mode because the minimum required hot water storage amount or heat amount has been secured. Turn off and start boiling.

  The hot water storage type hot water supply apparatus according to claim 7 is the hot water storage type hot water supply apparatus according to claim 3, wherein the temperature detected by the hot water storage temperature detection means is a predetermined temperature during the rated operation mode. In the following, when the hot water storage amount detecting means detects a hot water storage amount below a predetermined hot water storage amount, the heating means is switched to the powerful operation mode, and the temperature detected by the hot water storage temperature detection means is below a predetermined temperature, or The heating means is switched to the speed operation mode when the hot water storage amount detected by the hot water storage amount detection means is not more than a predetermined hot water storage amount.

According to the seventh aspect of the present invention, when the hot water storage temperature is lower than the predetermined temperature and the hot water storage amount is lower than the predetermined hot water storage amount within the predetermined period during the boiling operation in the rated output operation mode, Therefore, it is determined that it is impossible to boil to a desired state in the rated output operation mode, and the operation is switched to the powerful operation mode with a large output to perform the boiling operation.
When the hot water storage temperature is lower than the predetermined temperature or the hot water storage amount is lower than the predetermined hot water storage amount, the operation is switched to the speed operation mode and the boiling operation is performed.

  The hot water storage type hot water supply apparatus according to claim 8 is the hot water storage type hot water supply apparatus according to any one of claims 3 to 7, wherein the control means is configured to supply hot water in the hot water storage tank by the heating means. When forcibly increasing the boiling point, the boiling operation is performed by setting the heating output of the heating means to the speed operation mode or the powerful operation mode.

  According to the eighth aspect of the present invention, when the hot water in the hot water storage tank is forcibly boiled, the boiling operation is performed by setting the output for the boiling operation to the speed operation mode or the powerful operation mode.

  According to the hot water storage type hot water supply apparatus according to claim 1 of the present invention, by providing three boiling operation modes including the rated output operation mode, the speed operation mode, and the powerful operation mode, the user can Even when a large amount of hot water is used, since the heating operation mode suitable for the amount of hot water used can be selected, the optimum amount of hot water can be always secured. As a result, it is possible to prevent hot water from running out, reduce heat dissipation of wasted energy, and reduce electricity costs.

  According to the hot water storage type hot water supply apparatus according to claim 2 of the present invention, when boiling up to the second set temperature in the powerful operation mode, the second set temperature is appropriately set according to the amount of hot water used by the user. Therefore, when the amount of hot water used is large, the temperature is set to a high temperature, and when the amount of hot water used is small, the temperature is set to a low temperature to solve the shortage of hot water storage and the lack of hot water.

  According to the hot water storage type hot water supply apparatus according to claim 3 of the present invention, when the amount of hot water used is a normal amount of hot water, the hot water storage amount can be reduced without running out of hot water by performing a boiling operation in the normal rated output operation mode. Since it can be ensured, hot water can be efficiently boiled up with minimum energy.

  According to the hot water storage type hot water supply apparatus according to claim 4 of the present invention, when the hot water storage temperature is equal to or lower than the predetermined temperature and the amount of hot water storage is insufficient, the boiling operation is performed at the maximum output in the speed operation mode, In order to eliminate shortage of heat and hot water storage and prevent running out of hot water, secure hot water storage that matches the amount of hot water used, and make bath tub water, etc. always comfortable even when hot water is used be able to.

  According to the hot water storage type hot water supply apparatus according to claim 5 of the present invention, when the hot water storage temperature is equal to or higher than a predetermined temperature and the amount of hot water storage is insufficient, the hot water storage hot water is boiled in the powerful operation mode. Even if the hot water is low-temperature water or the amount of stored hot water is insufficient, it can be quickly boiled and dealt with.

  According to the hot water storage type hot water supply apparatus according to claim 6 of the present invention, during the boiling operation in the speed operation mode, the boiling operation is performed by switching to the powerful operation mode or the rated output operation mode according to the boiling state. Thus, energy consumption can be suppressed as much as possible, so that energy can be used effectively.

  According to the hot water storage type hot water supply apparatus according to claim 7 of the present invention, when the hot water storage temperature is lower than the predetermined temperature and the hot water storage amount is lower than the predetermined hot water storage amount during the boiling operation in the rated output operation mode, it is powerful. Switch to the operation mode to solve the shortage of hot water and heat. When the hot water storage temperature is lower than the predetermined temperature or the hot water storage amount is lower than the predetermined hot water storage amount, it is possible to make up for the shortage of hot water storage or heat shortage with the maximum output by switching to the speed operation mode.

  According to the hot water storage type hot water supply apparatus according to claim 8 of the present invention, when the hot water in the hot water storage tank is forcibly boiled, by performing the boiling operation in the speed operation mode or the powerful operation mode, It can suppress that hot water storage water falls by heat exchange.

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, for example, the hot water storage type hot water supply apparatus A heats the hot water in the hot water storage tank 11 by the heating unit 21 of the heat pump unit 2 in the midnight time when the unit price of the contracted power by time is low. It is a so-called eco-cute (natural refrigerant heat pump type electric water heater) that uses hot water stored in the hot water after boiling and storing it. This hot water storage type hot water supply apparatus A has a function of performing a reheating operation by circulating the bath water of the bath B in the bath circulation circuit 5 by the bath circulation pump 53 and exchanging the bath water with the hot water storage hot water by the heat exchanger 12. And hot water storage hot water in the hot water storage tank 11 is circulated in the heating circuit 7 by the heating circulation pump 23, and a heating operation is performed by exchanging the bathtub water with the hot water storage hot water in the heating unit 21. Yes.
This hot water storage type hot water supply apparatus A includes a heat pump unit 2 for heating hot water stored in the hot water storage tank 11, a hot water storage tank unit 1 for chasing the bathtub water in the bathtub B with the hot water stored in the hot water storage tank 11, and the hot water storage tank. The hot water storage 3 in 11 and hot water tap 3 for supplying hot water that has reached an appropriate temperature by mixing with tap water, bathtub B for storing bathtub water, the temperature of the bathtub water, etc. And a remote control (hereinafter simply referred to as “remote controller”) R for operating A.

  The hot water storage type hot water supply apparatus A is configured to heat a hot water storage tank 11 for storing hot water and a heat pump unit 2 that performs a boiling operation in a plurality of boiling operation modes according to the ability to boil the hot water in the hot water storage tank 11. A heat exchanger 12 for exchanging heat between the hot water stored in the hot water storage tank 11 and the hot water in the bathtub B, a can body thermistor T1 for detecting the hot water temperature in the hot water storage tank 11, and the heat exchanger 12. The bath circulation circuit 5 for connecting the bathtub B and circulating the bathtub water of the bathtub B, the reheating detection means 50 for detecting the reheating operation, and the heat pump for performing the heating operation A heat pump control unit 22 that switches the mode of the heating operation based on the unit 2 and the hot water temperature detected by the can body thermistor T1 and the hot water storage amount detected by the hot water storage temperature sensor T2. Eteiru.

≪Configuration of heat pump unit (heating means) ≫
As shown in FIG. 1, the heat pump unit 2 is a device for exchanging hot water to boil, send high temperature water to the upper layer in the hot water storage tank 11, and enter and circulate low temperature water in the lower layer in the hot water storage tank 11. Yes, for example, a natural refrigerant heat pump. The heat pump unit 2 mainly includes a heating unit 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 includes a rated output operation mode in which a boiling operation is performed at a set normal output, a speed operation mode in which the first pump is heated to a first set temperature with an output larger than the output of the rated output operation mode, and the first The system is configured to be operated in a powerful operation mode in which boiling is performed at a second set temperature higher than the set temperature and an output larger than the output in the rated output operation mode. The first set temperature is fixed to a temperature set by the user, and the second set temperature can be changed from the first set temperature to the set upper limit temperature.
The heat pump unit 2 corresponds to “heating means” described in the claims.

<Configuration of heating unit>
The heating unit 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 boiling high-temperature water, and includes, for example, a refrigerant-water heat exchanger as a condenser. . The heating unit 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 face 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 unit 21 of the heat pump unit 2 and heats it into high-temperature water. It is a circuit for raising the hot water storage temperature by returning to the circulation. The heating circulation circuit 7 includes a water inlet pipe 71, a hot water outlet pipe 72, a heating unit 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 low temperature water in the lower layer in the hot water storage tank 11 to the heating unit 21, one of which is connected to the lower end of the hot water storage tank 11 and the other connected to the heating unit 21.
The hot water discharge pipe 72 is a pipe for sending the high temperature water heated by the heating unit 21 to the upper layer part of the hot water storage tank 11, one of which is connected to the heating part 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 controller 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 unit 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 control unit 22 (see FIG. 2).

<Configuration of refrigerant circulation circuit>
The refrigerant circulation 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 unit 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 unit 21 that exchanges heat between 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 includes 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 controller 22 mainly controls the drive of the motor.

<Configuration of heat pump control unit (control means)>
The heat pump control unit 22 controls the heating operation and the boiling operation by the heat pump unit 2, and the function and operation will be described in detail later. When heat exchange is performed in the heating unit 21 of the refrigerant circulation circuit 20, the heat pump control unit 22 performs control so that the water to be heated is efficiently 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 heated water heating unit 21 and the refrigerant outlet temperature is constant, so that COP 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 circuit 22c, storage circuit 22d storing various data for operating each device of heat pump unit 2 and data for switching to each operation mode of boiling operation, can body thermistor (hot water storage temperature detection means) ) The hot water storage temperature of the upper layer in the hot water storage tank 11 detected at T1 and the hot water storage amount of the hot water stored in the hot water storage tank 11 detected by the hot water temperature sensor (hot water storage amount detection means) T2 are greater than or less than the predetermined hot water storage amount. A determination circuit 22e for determining whether there is an operation mode, an operation mode switching circuit 22f for switching the operation mode based on the determination of the determination circuit 22e, and those devices. And the microcomputer 22a for Gosuru, is provided.
The heat pump control unit 22 corresponds to a “control unit” described in the claims.

≪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 It is mainly composed of a heating circulation circuit 7 for boiling hot water stored in the hot water storage tank 11 and boiling it.

<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>
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.

<Configuration of can body thermistor (hot water storage temperature detection means)>
The can body thermistor T <b> 1 is a temperature detector for detecting the temperature of the hot water flowing in the hot water storage tank 11, and is installed in the vicinity of the heat exchanger 12 provided in the upper layer portion 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 "hot water storage temperature detection means" as described in a claim. The hot water storage 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 (hot water storage amount 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.
The hot water storage temperature sensor T2 corresponds to “hot water storage amount detection means” described in the claims.

<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 in the hot water storage tank 11, and is made of, for example, a stainless steel serpentine tube. It is installed in the upper layer. 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-out pipe 5a is provided with a bath going-out temperature sensor 51 that detects the temperature of the bath water in the bath going-out pipe 5a that flows out of the heat exchanger 12 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 tub B and prevents emptying, and a bath circulation pump that circulates the bath water in the tub B to the bath circulation circuit 5 53 and a bath return temperature sensor 52 that detects the temperature of the bath water in the bath return pipe 5b flowing into the heat exchanger 12 is 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 means 50 detects the temperature change of the bath water flowing through the bath circulation circuit 5 to determine whether the chasing operation is performed. It consists of a bath temperature sensor 51 to be detected, a bath return temperature sensor 52, and the like.
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, even when the reheating switch Rd is turned on, the presence or absence of the renewal operation command may be determined.

<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. This 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. A hot water tap for discharging hot water, for example, a curan or a shower faucet installed in a bathroom and connected to the mixed hot water supply pipe 62. 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 the 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.

<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 storage circuit 84 that stores various data for operating each device of the hot water storage tank unit 1 and a microcomputer 81 for controlling these devices are provided.

≪Configuration of remote control≫
The remote controller R is a device for remotely operating the hot water storage type hot water supply device A, and is an operating device for manually setting the hot water supply temperature, the temperature of the bath water, the amount of hot water filling, the operation mode of the heating operation, etc. It is installed inside and outside the bathroom. 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 and heats for a predetermined time by filling the amount of water set in (not shown), a reheating switch Rd that replenishes bath water, a reheating switch Re that performs reheating, and operation An operation mode selection switch Rf for switching the mode to “rated output operation mode”, “speed operation mode”, or “powerful operation mode” and a display unit Rg are provided, which are electrically connected to the remote control unit Rh, respectively. (See FIG. 2).

≪Operation of heat pump control unit (control means) ≫
Next, the operation of the heat pump control unit 22 in the hot water storage type hot water supply apparatus A according to the present invention will be described with reference mainly to FIG.
FIG. 3 is a flowchart showing switching to the operation mode of the hot water storage type hot water supply apparatus according to the present invention.

As shown in FIG. 3, when switching the boiling operation mode of the hot water storage type hot water supply apparatus A, it can be performed manually and automatically by the heat pump control unit 22 (step S1).
For example, when performing manually, the operation mode selection switch Rf of the remote controller R is operated, and the boiling operation is selected and set from the three operation modes of the rated output operation mode, the powerful operation mode, and the speed operation mode ( Step S2).

  When the rated output operation mode is set, the heat pump unit 2 is forced to perform a boiling operation at the output of the rated output operation mode (for example, 4.5 kw), and the heating unit 21 is heated in the heating circuit 7. Is heated (step S3).

  When the powerful operation mode is set, the heat pump unit 2 is forced to boil at a large output (for example, 6 kw) in the powerful operation mode, and the heating unit 21 supplies hot water in the heating circuit 7 to, for example, 65 ° C. It is heated up to a changeable temperature (second set temperature) of ˜90 ° C. (step S4).

  When the speed operation mode is set, the heat pump unit 2 is forced to boil at the maximum output (for example, 8 kW) in the speed operation mode, and the heating unit 21 supplies hot water in the heating circuit 7 to, for example, 65 ° C. Is heated to a fixed temperature (first set temperature) (step S5).

On the other hand, when performing automatically, the bath automatic switch Rc of the remote controller R is turned on to set the boiling operation to automatic operation (step S6).
Then, the heat pump control unit 22 takes in the hot water storage temperature detected by the can body thermistor T1 (step S7) and monitors whether the hot water storage temperature is equal to or higher than a predetermined temperature of 55 ° C., for example (step S8).
If the hot water storage temperature is equal to or higher than the predetermined temperature (Yes in step S8), the temperature data of each hot water storage temperature sensor T2 is taken in, and the hot water storage amount in the hot water storage tank 11 is detected (calculated) from this temperature data (step S9). .

  Subsequently, the heat pump control unit 22 determines whether or not the detected hot water storage amount is, for example, a predetermined hot water storage amount of 30 liters or more by the determination circuit 22e (step S10). When the hot water storage amount is equal to or greater than the predetermined hot water storage amount, it is determined that the hot water storage amount in the hot water storage tank 11 can correspond to the normal hot water usage amount, for example, up to 65 ° C. in the rated output operation mode of 4.5 kW output. A boiling operation is performed to secure a hot water storage amount so as not to run out (step S11).

  If the amount of stored hot water in the hot water storage tank 11 is less than 30 liters in step S10, it is determined that the amount of stored hot water is insufficient, and the output is larger than the rated output operation mode. The boiling operation is performed up to (2 set temperature) (step S15).

When the hot water storage temperature is lower than the predetermined temperature of 55 ° C. in step S8 (No in step S8), the temperature data of each hot water storage temperature sensor T2 is taken in, and the amount of hot water stored in the hot water storage tank 11 is determined from this temperature data. Detection (calculation) is performed (step S12).
The heat pump control unit 22 monitors whether the detected hot water storage amount is less than a predetermined hot water storage amount of, for example, 30 liters and the hot water storage amount is insufficient (step S13) (No in step S13). When the hot water storage amount is less than the predetermined hot water storage amount and the hot water storage amount is insufficient, for example, the boiling operation is performed to 65 ° C. (first set temperature) in the speed operation mode with the maximum output of 8 kW (step S14).

During the speed operation mode of step S14, the heat pump control unit 22 detects the hot water storage temperature in the hot water storage tank 11 by the can body thermistor T1 (step S16), and monitors whether the hot water storage temperature is equal to or higher than a predetermined temperature of 55 ° C., for example. (Step S17) (No in Step S17). Further, during the speed operation mode, the heat pump control unit 22 detects the hot water storage temperature in the hot water storage tank 11 by each hot water storage temperature sensor T2 (step S16), and the amount of hot water stored in the hot water storage tank 11 is determined from this temperature data, for example, It is monitored whether the amount of stored hot water is 30 liters or more (Step S19) (No in Step S19).
And when it is more than predetermined amount of hot water storage, the heat pump unit 2 switches a speed operation mode to a powerful operation mode, for example, carries out a boiling operation to 85 degreeC (2nd setting temperature) with an output of 6 kw (step S20). .

Further, the can body thermistor T1 and the hot water storage temperature sensor T2 detect the hot water storage temperature and the amount of hot water stored in the upper layer of the hot water storage tank 11 (step S21), and the hot water storage temperature is equal to or higher than the predetermined temperature or the hot water storage amount is the predetermined hot water storage amount. If it is above (step S22), the operation mode is switched to the rated output operation mode, and the operation is increased to, for example, 65 ° C. with a normal output (eg, 4.5 kW) (step S11).
Otherwise, the monitoring is continued to determine whether the hot water storage temperature is equal to or higher than the predetermined temperature or the hot water storage amount is equal to or higher than the predetermined hot water storage amount (No in step S22).

During the rated output operation mode of step S11, the hot water storage temperature in the hot water storage tank 11 is detected by the can body thermistor T1, and the amount of hot water stored in the hot water storage tank 11 is detected from the temperature detection data of each hot water storage temperature sensor T2 (step S23). ), Whether the hot water storage temperature in the hot water storage tank 11 is lower than a predetermined temperature of 55 ° C., for example, and whether the hot water storage amount is lower than the predetermined hot water storage amount of 30 liters, for example (step S24) (No in step S24)
When the hot water storage temperature in the hot water storage tank 11 is equal to or lower than the predetermined temperature and the hot water storage amount is equal to or lower than the predetermined hot water storage amount (Yes in step S24), the heat pump unit 2 is switched to the powerful operation mode and is necessary for hot water supply. A hot water storage amount is secured (step S25).

Furthermore, in this state, the hot water storage temperature in the hot water storage tank 11 is detected by the can body thermistor T1, and the amount of hot water stored in the hot water storage tank 11 is detected based on the temperature detection data of each hot water storage temperature sensor T2 (step S26). It is monitored whether the stored hot water temperature is equal to or lower than the predetermined temperature or whether the stored hot water amount is equal to or lower than the predetermined stored hot water amount (step S27) (No in step S27).
When the hot water storage temperature in the hot water storage tank 11 is lower than the predetermined temperature or the hot water storage amount is lower than the predetermined hot water storage amount (Yes in step S27), the heat pump unit 2 is switched to the speed operation mode to store hot water required for hot water supply. The amount is secured (step S14).

  In addition, when the heat pump control unit 22 forcibly boils hot water in the hot water storage tank 11 by the heating unit 21 of the heat pump unit 2, the heat pump unit 2 sets the heating output of the heat pump unit 2 to the speed operation mode or the powerful operation mode. To prevent the water from running out.

≪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 for starting the boiling operation is issued to the heat pump control unit 22.
Upon receiving this command, the heat pump control unit 22 starts driving the compressor 27 and then starts to drive the heating circulation pump 23. The heat pump control unit 22 takes out from the water inlet pipe 71 connected to the lower end of the hot water storage tank 11. Water is heated to a high temperature of about 70 to 90 ° C. by the heating unit 21, returned to the upper layer portion 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.

≪Explanation when the amount of stored hot water is 30L and the predetermined temperature is 55 ℃ and 50 ℃ ≫
FIG. 4 is a table showing an example of implementation of each operation mode by the hot water storage type hot water supply apparatus according to the present invention. The reference predetermined hot water storage amount for switching the operation mode is 30 liters, and the reference predetermined temperatures are 55 ° C. and 50 ° C. This case is shown.
Next, an example in which the reference predetermined hot water storage amount for switching the operation mode is 30 liters and the reference predetermined temperatures are 55 ° C. and 50 ° C. will be described with reference mainly to FIG.

<Normal time>
The bath automatic switch Rc of the remote controller R is operated to perform a hot water filling operation on the bathtub B, and the hot water amount of the hot water set in the bathtub B is filled. When the microcomputer 81 of the hot water supply control unit 8 determines that the hot water filling operation has 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 B is turned on. The temperature of the bath water is monitored, and a heat insulation operation for keeping the temperature at the set temperature set by the remote controller R is started. And it continues monitoring that the bathtub water of bathtub B falls below preset hot water temperature.

In such “normal time”, the heat pump unit 2 determines that the amount of stored hot water is slightly insufficient when the stored water amount detection sensor T2a that detects the amount of stored hot water of 30 liters is less than 55 ° C., and is shown in FIG. Boiling operation is performed in the “normal” rated output operation mode.
In this case, in the heat pump control unit 22, the determination circuit 22e determines the operation in the rated output operation mode by comparing the temperature detection signal from the hot water storage amount detection sensor T2a with the data in the storage circuit 22d, and the drive circuit 22b is in the heat pump unit 2. Each of the above devices is boiled in rated output operation mode.

  In this state, when the hot water storage temperature of the hot water storage tank 11 further decreases due to a chasing operation or the like and the hot water storage amount detection sensor T2a detects less than 50 ° C., it is determined that the hot water storage amount is further insufficient, and FIG. Boiling operation is performed at the maximum output by the “normal” speed operation mode shown.

<When sparing hot water>
In addition, when the hot water storage amount is reduced due to reheating or the like, the heat pump unit 2 detects that the hot water storage amount detection sensor T2a for detecting the hot water storage amount of 30 liters is less than 55 ° C. It is judged that the amount of stored hot water is insufficient, and the boiling operation is performed with a relatively small output in the rated output operation mode.

In this state, when the hot water storage temperature of the hot water storage tank 11 is further lowered due to hot water supply or the like and the hot water storage amount detection sensor T2a detects less than 50 ° C., it is determined that the hot water storage amount has become insufficient, and “ It is switched to the powerful operation mode of “When hot water is conserved” and heated up.
In this case, in the heat pump control unit 22, the determination circuit 22e determines the switching of the powerful operation mode by comparing the temperature detection signal of less than 50 ° C. from the hot water storage amount detection sensor T2a with the data of the storage circuit 22d, and the operation mode switching circuit 22f raises the output of each device of the heat pump unit 2 to the powerful operation mode, and makes it boil up.

<When forced to increase>
In the case of "forced boiling" in FIG. 4 where the user operates the heating switch Re to perform the heating operation, the heat pump unit 2 has a hot water storage amount detection sensor T2a that detects a hot water storage amount of 30 liters below 55 ° C. If it is detected, it is determined that the user desires to increase boiling, and the output is increased to the powerful operation mode and the boiling operation is performed.

In this state, when the hot water storage temperature of the hot water storage tank 11 is further lowered due to hot water supply or the like and the hot water storage amount detection sensor T2a detects less than 50 ° C., it is determined that an increase in the hot water storage amount is desired. The operation mode is switched to the speed operation mode “when hot water is low” shown in FIG.
In this case, in the heat pump control unit 22, the determination circuit 22e determines the switching of the speed operation mode by comparing the temperature detection signal of less than 50 ° C. from the hot water storage amount detection sensor T2a with the data of the storage circuit 22d, and the operation mode switching circuit 22f makes each apparatus of the heat pump unit 2 boil up in the speed operation mode.

<During reheating during driving>
In the case of “boiling operation during reheating” in FIG. 4, the temperature of the bathtub water in the bathtub B drops below the set temperature, and the bath circulation pump 53 is driven to flow the bathtub water to the heat exchanger 12 and take a bath. By circulating through the circulation circuit 5, the hot water in the hot water storage tank 11 is deprived of heat by heat exchange and decreases. The heat pump control unit 22 detects the temperature drop of the hot water storage hot water with the can body thermistor T1, and also detects the decrease in the amount of hot water storage from the temperature detection data from the hot water storage temperature sensor T2, and heats up the heat pump unit 2.

In this state, when the hot water storage temperature of the hot water storage tank 11 further decreases due to reheating or the like and the hot water storage amount detection sensor T2a detects less than 50 ° C., it is determined that the hot water storage amount has further decreased, and is shown in FIG. Switch to the speed operation mode of “When hot water is low” and boil operation with large output.
In this case, in the heat pump control unit 22, the determination circuit 22e determines the switching of the speed operation mode by comparing the temperature detection signal of less than 50 ° C. from the hot water storage amount detection sensor T2a with the data of the storage circuit 22d, and the operation mode switching circuit 22f can operate each apparatus of the heat pump unit 2 with the maximum output of the speed operation mode, and can shorten the reheating time.

<When the amount of heat for bath operation is insufficient>
When “the amount of heat in the bath operation is insufficient” in FIG. 4, when the amount of bath water in the bathtub B decreases and the automatic or manual hot water filling valve V4 is opened, the bath operation to the bathtub B (hot water filling) Operation) is started.
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 hot water stored in the hot water storage tank 11 is pushed out into the tap water and supplied from the hot water storage tank 11, so that the amount of stored hot water and the temperature of the stored hot water are lowered, resulting in insufficient heat. Then, the heat pump control unit 22 detects the temperature drop of the hot water storage hot water with the can body thermistor T1, and also detects the decrease in the amount of hot water storage from the temperature detection data from the hot water storage temperature sensor T2, and heats up the heat pump unit 2. .

In this state, when the hot water storage temperature of the hot water storage tank 11 is further lowered by hot water supply or the like and the hot water storage amount detection sensor T2a detects less than 50 ° C., it is determined that the hot water storage amount has further decreased, and “ Switching to the speed operation mode of “when the amount of heat in the bath operation is insufficient” is operated for boiling.
In this case, in the heat pump control unit 22, the determination circuit 22e determines the switching of the speed operation mode by comparing the temperature detection signal of less than 50 ° C. from the hot water storage amount detection sensor T2a with the data of the storage circuit 22d, and the operation mode switching circuit 22f can operate each device of the heat pump unit 2 with the maximum output of the speed operation mode, and can solve the shortage of heat.

  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, the case where the heat pump unit 2 is used as the heating means for heating the hot water in the hot water storage tank 11 has been described as an example. For example, a device that boils hot water by using an oil vaporization type or gas type burner or an electric heater as the heating unit 21 may be used.

  Moreover, in the said embodiment, as shown in FIG. 4, the minimum hot water storage amount in various operation modes was fixed to, for example, 30 liters, and the predetermined hot water storage temperature was controlled to be 55 ° C. or higher. Alternatively, the heat pump unit 2 may be controlled to boil up in each operation mode so as to keep the amount of heat by appropriately changing the minimum hot water storage amount and the predetermined hot water storage temperature.

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 each operation mode by the hot water storage type hot-water supply apparatus which concerns on this invention. It is a table | surface which shows an example of implementation of each operation mode by the hot water storage type hot water supply apparatus concerning this invention, and shows the case where the reference | standard predetermined hot water storage amount which switches an operation mode is 30 liters, and the reference | standard predetermined temperature is 55 degreeC and 50 degreeC. .

Explanation of symbols

1 Hot water storage tank unit 2 Heat pump unit (heating means)
DESCRIPTION OF SYMBOLS 11 Hot water storage tank 12 Heat exchanger 21 Heating part 22 Heat pump control part (control means)
A Hot water storage type hot water supply system T1 Can body thermistor (hot water temperature detection means)
T2 Hot water storage temperature sensor (hot water storage amount detection means)

Claims (8)

A hot water storage tank for storing hot water,
In a hot water storage type hot water supply apparatus provided with heating means for performing boiling operation in a plurality of boiling operation modes according to the ability to boil hot water in the hot water storage tank,
The heating means is a rated output operation mode in which a boiling operation is performed at a set normal output;
A speed operation mode in which the output is heated to the first set temperature with an output larger than the output of the rated output operation mode;
A powerful operation mode in which boiling is performed at a second set temperature higher than the first set temperature, with an output larger than the output of the rated output operation mode and smaller than the speed operation mode;
A hot water storage type hot water supply apparatus characterized by comprising: The first set temperature is fixed to a set temperature,
The hot water storage hot water supply apparatus according to claim 1, wherein the second set temperature can be changed from the first set temperature to a settable upper limit temperature. A hot water storage tank for storing hot water,
Hot water storage temperature detecting means for detecting the hot water storage temperature of the upper layer in the hot water storage tank;
Hot water storage amount detection means for detecting the amount of hot water storage in the hot water storage tank;
Heating means for performing boiling operation in a plurality of boiling operation modes according to the ability to boil hot water in the hot water storage tank;
In a hot water storage type hot water supply apparatus comprising a control means for controlling the heating means,
The heating means is a rated output operation mode in which a boiling operation is performed at a set normal output;
Powerful operation mode that heats up with an output larger than the output of this rated output operation mode,
It is equipped with a speed operation mode that heats up with a larger output than the output of this powerful operation mode,
The control means boils the heating means in the rated operation mode when the temperature detected by the hot water storage temperature detection means is equal to or higher than a predetermined temperature and the hot water storage amount detection means detects that the hot water storage amount is higher than a predetermined hot water storage amount. A hot water storage hot water supply device that is operated.   The control means causes the heating means to boil up in the speed operation mode when the temperature detected by the hot water storage temperature detection means is equal to or lower than a predetermined temperature and the hot water storage amount detection means detects an insufficient hot water storage amount. The hot water storage type hot water supply apparatus according to claim 3, wherein   The control means causes the heating means to boil up in the powerful operation mode when the temperature detected by the hot water storage temperature detection means is equal to or higher than a predetermined temperature and the hot water storage amount detection means detects an insufficient hot water storage amount. The hot water storage type hot water supply apparatus according to claim 3 or 4, wherein the hot water storage type hot water supply apparatus is provided. When the temperature detected by the hot water storage temperature detection unit is equal to or higher than a predetermined temperature and the hot water storage amount detection unit detects a hot water storage amount greater than or equal to a predetermined hot water storage amount during the speed operation mode, the control unit controls the heating unit. Switch to the powerful operation mode,
Further, when the temperature detected by the hot water storage temperature detecting means is equal to or higher than a predetermined temperature, or the hot water storage amount detected by the hot water storage amount detecting means is equal to or higher than a predetermined hot water storage amount, the heating means is switched to the rated operation mode. The hot water storage type hot water supply apparatus according to claim 4, wherein When the temperature detected by the hot water storage temperature detecting means is not more than a predetermined temperature and the hot water storage amount detecting means detects a hot water storage amount not more than a predetermined hot water storage amount during the rated operation mode, the control means Switch to the powerful operation mode,
Further, when the temperature detected by the hot water storage temperature detecting means is not more than a predetermined temperature, or when the hot water storage amount detected by the hot water storage amount detecting means is not more than a predetermined hot water storage amount, the heating means is switched to the speed operation mode. The hot water storage type hot water supply apparatus according to claim 3, wherein   When the heating means forcibly boils hot water in the hot water storage tank by the heating means, the heating means sets the output to be heated by the heating means to the speed operation mode or the powerful operation mode to perform the boiling operation. The hot water storage type hot water supply apparatus according to any one of claims 3 to 7, wherein the hot water storage type hot water supply apparatus is provided.

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