JP2010043759A - Storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a storage type water heater suppressing lowering of temperature of high temperature water within a hot water storage tank even when intermediate temperature water flows into the hot water storage tank at start of boiling up operation. <P>SOLUTION: The storage type water heater is provided with: the hot water storage tank 2 having an inner side divided into an intermediate temperature water storage part 36 and a hot water storage part 35 communicated with each other at the lower side; a heat pump unit 3 having one end connected to the hot water storage tank 2 by a pipe and heating hot water flowing in from the hot water storage tank 2; a boiling-up return selector valve 51 connected to the other end of the heat pump unit 3, the intermediate temperature water storage part 36 and the hot water storage part 35 by a pipe, switchable so that the hot water heated by the heat pump unit 3 flows into the intermediate temperature water storage part 36 or the hot water storage part 35. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply apparatus including a hot water storage tank for storing hot water boiled using a heating device such as a heat pump unit.

  As a conventional hot water storage type hot water supply device, for example, “the hot water storage tank 10 is partitioned by a partition member 10a made of a highly heat insulating resin except for the upper end side, so that the intermediate temperature water storage portion 10b extends in the vertical direction. When the hot water storage operation or the boiling increase operation when the amount of remaining hot water in the hot water storage tank 10 is small, only the first circulation pump 14a and the compressor 21 are operated, and the first on-off valve 15d is provided. 3 and the second on-off valve 17a is opened, whereby the refrigerant discharged from the compressor 21 flows through the gas cooler 22 and then passes through the expansion valve 23 as shown in FIG. The refrigerant flowing into the refrigerant and flowing out from the evaporator 24 is sucked into the compressor 21. The water on the lower side of the hot water storage tank 10 flows through the first circulation circuit 14 by the first circulation pump 14a. Then, heat is exchanged in the gas cooler 22 and becomes high-temperature water, which is stored on the upper side of the hot water storage tank 10. When performing a reheating operation for heating the hot water in the bathtub 16a, the second circulation pump 15b and the third Only the circulation pump 16b is operated to open the first on-off valve 15d and close the second on-off valve 17a, whereby the second circulation circuit 15 in the heat exchanger 15a is closed as shown in FIG. It is possible to heat the hot water in the bathtub 16a to a predetermined temperature by exchanging heat between the hot water flowing through the hot water and the hot water in the bathtub 16a flowing through the third circulation circuit 16. At this time, the second circulation is possible. The high-temperature water flowing through the circuit 15 is cooled by exchanging heat in the heat exchanger 15a, becomes medium-temperature water having a temperature lower than that of the high-temperature water, and is stored in the medium-temperature water storage unit 10b. Example, if is a thing called Patent Document 1) has been proposed.

JP 2007-178063 (paragraphs 0016, 0027, 0028, FIGS. 1 and 2)

  The conventional hot water storage type hot water supply apparatus can return the medium-temperature water generated after the hot water in the bathtub or after being used as a heat source of the heating facility to the medium-temperature water storage unit (see, for example, Patent Document 1). ). However, for example, hot water heated by a heating device such as a heat pump flows into a place other than the medium temperature water storage section of the hot water storage tank. Here, for a while after the heating device is activated (at the start of the boiling operation), the hot water heated by the heating device is not heated sufficiently and becomes medium-temperature water. When this medium temperature water flows into the hot water storage tank, it mixes with the high temperature water stored in the hot water storage tank. That is, the temperature of the hot water in the hot water storage tank is lowered. Therefore, there is a problem that the medium temperature water in the hot water storage tank increases and the high temperature water in the hot water storage tank is insufficient.

  Further, in the conventional hot water storage type hot water supply apparatus, a communication port for the intermediate temperature water storage unit is formed in the upper part of the hot water storage tank. For this reason, when the intermediate temperature water stored in the intermediate temperature water storage part is used, the high temperature water is supplied to the intermediate temperature water storage part from the communication port formed in the upper part of the hot water storage tank. Therefore, if the hot water generated after the hot water in the bathtub is used or after being used as a heat source for the heating facility flows into the hot water storage part, the hot water stored in the hot water storage part is mixed. End up. That is, the temperature of the hot water in the hot water storage tank is lowered. Therefore, there is a problem that the medium temperature water in the hot water storage tank increases and the high temperature water in the hot water storage tank is insufficient.

  The present invention has been made to solve the above-described problems, and a first object is to provide hot water in a hot water storage tank even if medium temperature water flows into the hot water storage tank at the start of boiling operation. It is to obtain a hot water storage type hot water supply device capable of suppressing a temperature drop. The second purpose is to reduce the temperature of the hot water in the hot water storage tank even if the medium temperature water generated after the hot water in the bathtub is used or as a heat source for the heating facility flows into the medium temperature water storage section. It is to obtain a hot water storage type hot water supply device that can be suppressed.

  A hot water storage type hot water supply apparatus according to the present invention includes a hot water storage tank that is divided into a first hot water storage section and a second hot water storage section that communicate with each other at a lower portion, and one end portion is connected to the hot water storage tank by piping. A heating device that heats the hot water flowing in from the tank, and each connection port is connected to the other end of the heating device, the first hot water storage unit, and the second hot water storage unit, and is heated by the heating device. And a switching valve that can be switched so that the hot water that has been discharged flows into the first hot water storage section or the second hot water storage section.

  The hot water storage type hot water supply apparatus according to the present invention includes a hot water storage tank that is internally divided into a first hot water storage section and a second hot water storage section that communicate with each other at a lower portion, and one end piped to the first hot water storage section. Hot water that is connected and has the other end connected to the second hot water storage section by piping and that has a heat exchanger that exchanges heat between the hot water flowing in from the hot water storage tank and the fluid to be heated, and that has flowed out of the heat exchanger Flows into the first hot water storage section.

  According to the hot water storage type hot water supply apparatus according to the present invention, at the start of the boiling operation in which the heating device cannot sufficiently heat the hot water, the medium hot water generated in the boiling operation is stored in, for example, the first hot water storage section. After the boiling operation is started, after the hot water can be heated sufficiently, the high temperature water is stored in, for example, the second hot water storage section. For this reason, the temperature drop of the high temperature water in a hot water storage tank can be suppressed, without mixing medium temperature water and high temperature water in a hot water storage tank.

  Moreover, according to the hot water storage type hot water supply apparatus according to the present invention, the first hot water storage section and the second hot water storage section communicate with each other at the lower part. For this reason, for example, when medium temperature water stored in the first hot water storage section is used, the first hot water storage section is supplied with low temperature water stored in the lower part of the hot water storage tank. Therefore, even if the hot water generated after the hot water in the bathtub is heated or used as a heat source of the heating facility flows into the first hot water storage section, the intermediate hot water and the high temperature stored in the second hot water storage section, for example, There is no mixing with water. Therefore, the temperature drop of the hot water in the hot water storage tank can be suppressed without mixing the intermediate temperature water and the high temperature water in the hot water storage tank.

Embodiment 1 FIG.
FIG. 1 is a schematic configuration diagram illustrating a hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention.
This hot water storage type hot water supply apparatus includes a hot water storage tank unit 1 having a hot water storage tank 2, a heat pump unit 3 that heats hot water in the hot water storage tank 2, and the like. Here, the heat pump unit 3 corresponds to the heating device of the present invention.

Inside the hot water storage tank 2, a partition portion 38 extending in the vertical direction (substantially vertical direction) is provided. The partition 38 is provided in the vicinity of the wall surface of the hot water storage tank 2, and the upper part and the side part are joined to the wall surface of the hot water storage tank 2. Thereby, the inside of the hot water storage tank 2 is divided into two hot water storage parts by the partition part 38. That is, in the hot water storage tank 2, a hot water storage part 35 formed in the approximate center of the hot water storage tank 2 and an intermediate hot water storage part 36 formed in the vicinity of the wall surface of the hot water storage tank 2 are formed. Here, the intermediate hot water storage part 36 corresponds to the first hot water storage part of the present invention, and the hot water storage part 35 corresponds to the second hot water storage part of the present invention. The hot water storage unit 35 and the intermediate hot water storage unit 36 are configured to communicate with each other in the vicinity of the lower portion of the hot water storage tank 2 via the bottom communication unit 25. The number, shape, size, and the like of the bottom communication portion 25 are arbitrary. In other words, the hot water storage unit 35 and the intermediate temperature water storage unit 36 may be configured to communicate with each other in the vicinity of the lower part of the hot water storage tank 2.
For example, as shown in FIG. 23, the partition portion 38 is extended to the vertical direction of the hot water storage tank 2, the lower portion is joined in addition to the upper portion and the side portion of the partition portion 38, and the partition portion 38 penetrates the lower portion of the partition portion 38. The communication part 25 may be formed by providing a communication hole. In this case, since the partition part 38 is connected by the upper part, side part, and lower part of the hot water storage tank 2, the attachment intensity | strength of the partition part 38 can be made high.
Moreover, the partition part 38 and the hot water storage tank 2 may be integrally formed.

  The heat pump refrigerant circuit 15 of the heat pump unit 3 is configured by connecting a compressor 11, a refrigerant-water heat exchanger 12 serving as a radiator, an electronic expansion valve 13, and a forced air-cooled evaporator 14. The heat pump unit 3 uses carbon dioxide, which is a natural refrigerant, as a refrigerant.

  The carbon dioxide refrigerant compressed by the compressor 11 is discharged as a high-temperature and high-pressure gas phase. The high-temperature and high-pressure carbon dioxide refrigerant discharged from the compressor 11 flows into the refrigerant-water heat exchanger 12 and dissipates heat to the low-temperature water stored in the hot water storage tank 2 by the refrigerant-water heat exchanger 12. However, it is cooled in a supercritical state. And it is throttled by the electronic expansion valve 13 and expanded (decompressed) to become a carbon dioxide refrigerant in a gas-liquid two-phase state at a low temperature and low pressure. The low-temperature, low-pressure, gas-liquid two-phase carbon dioxide refrigerant that has exited the electronic expansion valve 13 flows into the evaporator 14, evaporates while absorbing heat from the air in the evaporator 14, and enters a gas phase state. The vapor-phase carbon dioxide refrigerant that has left the evaporator 14 flows into the compressor 11 and is compressed again into a high-temperature and high-pressure vapor-phase state.

In the refrigerant-water heat exchanger 12, the low-temperature water (for example, 5 ° C.) stored in the hot water storage tank 2 is heated to the high-temperature and high-pressure carbon dioxide refrigerant flowing through the refrigerant-water heat exchanger 12,
Boiled to hot water 45 (eg 90 ° C.). Here, the carbon dioxide flowing through the refrigerant-water heat exchanger 12 dissipates heat to the low-temperature water stored in the hot water storage tank 2 in a supercritical state. For this reason, the low temperature water stored in the hot water storage tank 2 can be efficiently heated to a high temperature.

  The lower part of the hot water storage tank 2 and one end of the refrigerant-water heat exchanger 12 of the heat pump unit 3 are connected by a low-temperature water extraction pipe 9. The low-temperature water take-out pipe 9 is provided with a heat pump circulation pump 16 for allowing low-temperature water stored in the hot water storage tank 2 to flow into the refrigerant-water heat exchanger 12. The other end of the refrigerant-water heat exchanger 12 is connected to the first valve portion of the boiling return switching valve 51 via the boiling connection pipe 44. Here, the boiling return switching valve 51 corresponds to the switching valve of the present invention. A boiling temperature sensor 23 for detecting the temperature of the hot water after being heated by the refrigerant-water heat exchanger 12 is attached to the boiling connection pipe 44.

  The boiling return switching valve 51 is a three-way valve, and the second valve portion of the boiling return switching valve 51 is connected to the upper part of the hot water storage unit 35 via the boiling return pipe 10. Further, the third valve portion of the boiling return switching valve 51 is connected to the boiling hot water return pipe 52. The boiling hot water return pipe 52 is connected to an intermediate hot water upper pipe 27 having one end connected to the upper part of the hot medium storage part 36. In the first embodiment, the boiling return switching valve 51 is a three-way valve, but the boiling return switching valve 51 may be composed of, for example, two two-way valves.

  The other end of the above-described intermediate warm water upper pipe 27 is connected to the second valve portion of the intermediate warm water mixing valve 28 which is a three-way valve. The first valve portion of the intermediate temperature water mixing valve 28 is connected to the upper portion of the hot water storage portion 35 via the hot water piping 7. The third valve portion of the intermediate temperature water mixing valve 28 is connected to the intermediate temperature water mixing valve downstream pipe 48. Here, the intermediate temperature water mixing valve 28 corresponds to the mixing valve of the present invention. An intermediate temperature water mixing temperature sensor 29 for detecting the temperature of hot water flowing out from the intermediate temperature water mixing valve downstream pipe 48 is attached to the intermediate temperature water mixing valve downstream pipe 48. Although the intermediate warm water mixing valve 28 is a three-way valve in the first embodiment, the intermediate warm water mixing valve 28 may be constituted by two two-way valves, for example.

  The other end of the intermediate temperature water mixing valve downstream pipe 48 is connected to a first valve portion of a hot water supply mixing valve 30 that is a three-way valve. A second valve portion of the hot water mixing valve 30 is connected to the hot water tap 4 via a hot water mixing valve downstream pipe 32. This hot-water tap 4 is installed in a kitchen, a washroom, etc., for example. A hot water temperature sensor 33 for detecting the temperature of the hot water flowing out from the hot water mixing valve 30 is attached to the hot water mixing valve downstream pipe 32 in the vicinity of the hot water mixing valve 30. The third valve portion of the hot water supply mixing valve 30 is connected to a hot water supply water supply pipe 31. This hot water supply water supply pipe 31 is connected to a water supply pipe 8 connected to a low temperature water supply source.

  In the first embodiment, the hot water supply mixing valve 30 is a three-way valve. However, the hot water supply mixing valve 30 may be composed of, for example, two two-way valves. A plurality of hot-water taps 4 may be provided. The hot water supply temperature sensor 33 is not limited to the vicinity of the hot water supply mixing valve 30, and the hot water supply temperature sensor 33 can be provided at an arbitrary position of the hot water supply mixing valve downstream pipe 32, for example, in the vicinity of the hot water supply tap 4.

  As described above, one end of the water supply pipe 8 is connected to the hot water supply pipe 31 and the other end is connected to a low-temperature water supply source. The water supply pipe 8 branches off in the middle and is also connected to the lower part of the hot water storage tank 2. The water supply pipe 8 is provided with a pressurizing pump (not shown). By driving the pressurizing pump, the low-temperature water is pumped into the hot water storage tank 2 and also flows into the hot water supply pipe 31. The temperature of the low-temperature water is detected by a feed water temperature sensor 37 attached to the feed water pipe 8.

  The hot water storage tank unit 1 includes a heat exchanger 18 connected to the heating circuit 24. The heating circuit 24 includes a heating terminal 6, a heat exchanger 18, and a heating terminal circulation pump 26 connected by piping. The heating terminal 6 is, for example, installed under the floor and performs floor heating. The heating terminal 6 is installed in a bathroom or the like, for example, and performs heating or drying of the bathroom or the like. The heating terminal 6 is installed in, for example, a bathroom or the like and performs additional cooking of a bath. One end of the heat exchanger 18 is connected to the hot water supply pipe 7 via a high-temperature water extraction pipe 19. The other end of the heat exchanger 18 is connected to the middle warm water upper pipe 27 via the middle warm water lower pipe 20 and the heating warm water return pipe 49. A heating temperature sensor 40 for measuring the temperature of the hot water flowing out from the heat exchanger 18 is attached to the intermediate temperature water lower pipe 20. Further, the intermediate hot water lower pipe 20 is provided with a heating circulation pump 22 for flowing hot water into the heat exchanger 18. The heating hot water return pipe 49 is provided with a heating hot water return valve 50.

FIG. 2 is a cross-sectional view of the hot water storage tank shown in FIG. Details of the hot water storage tank 2 will be described with reference to FIGS. 2 and 1.
The hot water storage tank 2 has a substantially cylindrical shape with its upper and lower portions closed. And the partition part 38 extended in the up-down direction (substantially perpendicular direction) is provided in the hot water storage tank 2. As shown in FIG. The partition portion 38 has a substantially cylindrical portion 38 a that is slightly smaller than the hot water storage tank 2. A part of the side surface of the cylindrical portion 38a is cut, and a protruding edge 38b protruding in the outer peripheral direction is formed at the cut portion. In the present invention, a shape in which a part of the partition portion 38 (cylindrical portion 38a) is cut is also referred to as a cylindrical shape.

  The upper part of the cylindrical part 38a and the protruding edge 38b and the side part of the protruding edge 38b are joined to the inner wall of the hot water storage tank 2, and the interior of the hot water storage tank 2 is divided into two hot water storage parts. Of these two hot water storage portions, the hot water storage portion formed between the inner side surface of the hot water storage tank 2 and the outer side surface portion of the partition portion 38 is an intermediate hot water storage portion 36. A hot water storage section formed between the inner side surface of the hot water storage tank 2 and the inner side surface of the partition section 38 is a hot water storage section 35. At this time, since the vertical length of the partition portion 38 is smaller than the vertical length of the hot water storage tank 2, the hot water storage portion 35 and the intermediate hot water storage portion 36 are communicated with each other in the vicinity of the lower portion of the hot water storage tank 2.

  It is preferable that the partition portion 38 has a structure with high heat insulation performance. For example, the partition portion 38 may have a structure in which a plurality of (for example, two) plate members are stacked. For example, a structure in which a plurality of (for example, two) plate members are stacked and disposed via a gap, and an air heat insulating layer is formed between the plate members (gap). For example, you may comprise the partition part 38 with a material with small heat conductivity. The material thickness of the partition portion 38 may be increased. Moreover, you may comprise the partition part 38 combining these structures. By improving the heat insulation performance of the partition part 38, the heat leakage from the hot water storage part 35 in which the high temperature water 45 is stored to the intermediate temperature water storage part 36 in which the intermediate temperature water is stored can be suppressed.

  As shown in FIGS. 1 and 2, a hot water temperature sensor 34 for high temperature water and a hot water temperature sensor 39 for medium temperature water are provided outside the side surface of the hot water storage tank 2. Here, the hot water temperature sensor 34 for high temperature water corresponds to the second temperature sensor of the present invention, and the hot water temperature sensor 39 for medium temperature water corresponds to the first temperature sensor of the present invention. The hot water temperature sensor 34 is a temperature sensor that detects the temperature of hot water stored in the hot water storage unit 35. The hot water temperature sensor 34 for high temperature water is provided on the side surface of the hot water storage tank 2 in a range where the protruding edges 38b of the partition portion 38 are inscribed, that is, in a range where the hot water storage portion 35 is inscribed. Hereinafter, a range where the hot water storage unit 35 and the side surface of the hot water storage tank 2 are in contact with each other is referred to as a wall surface communication unit 21. In the hot water temperature sensor 34 for hot water, five hot water temperature sensors 34 a to 34 e for hot water are provided at predetermined intervals along the vertical direction of the hot water storage tank 2. The hot water temperature sensor 39 for intermediate temperature water is a temperature sensor that detects the temperature of hot water stored in the intermediate temperature water storage unit 36. The hot water temperature sensor 39 for intermediate hot water is provided on the side surface of the hot water storage tank 2 in a range where the intermediate hot water storage portion 36 is inscribed. The medium temperature water hot water temperature sensor 39 is provided with five medium temperature water hot water temperature sensors 39 a to 39 e at predetermined intervals along the vertical direction of the hot water storage tank 2.

  The hot water temperature sensor 34 for hot water and the hot water temperature sensor 39 for medium temperature water each detect the temperature of hot water stored in the hot water storage section 35 and the temperature of hot water stored in the intermediate temperature water storage section 36. It is possible.

(Description of operation)
Next, the operation of the hot water storage type hot water supply apparatus having the above configuration will be described.
For the operation of the hot water storage type hot water supply device, hot water supply operation for supplying hot water from the hot water tap 4, boiling operation for boiling water using the heat pump unit 3, floor heating and reheating of the bath using the heating terminal 6 are performed. There is heating operation. First, the case where the hot water storage type hot water supply apparatus performs each of the heating operation, the heating operation, and the hot water supply operation independently will be described. Next, an operation when the hot water storage type hot water supply apparatus performs each operation in combination will be described. In the following description of the operation, the hot water stored in the hot water storage unit 35 is appended with a, and the hot water stored in the medium temperature water storage unit 36 is appended with b. explain.

(Boiling operation)
First, the operation when the hot water storage type hot water supply apparatus performs only the boiling operation will be described.
3 and 4 are operation explanatory views when the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention performs only a boiling operation, and FIG. 3 is an operation showing a state before the heat pump unit 3 is stabilized. FIG. 4 is an explanatory diagram of the operation after the heat pump unit 3 is stabilized.

  Hot water is stored in the hot water storage tank 2. The temperature distribution of the hot water has a temperature gradient such that the temperature is higher at the upper part of the hot water storage tank 2, and the temperature is lower toward the lower part of the hot water storage tank 2. More specifically, the hot water storage unit 35 of the hot water storage tank 2 stores high temperature water 45a, medium temperature water 46a, and low temperature water 47a from the upper part to the lower part of the hot water storage part 35. In the hot water storage tank 2, intermediate temperature water 46 b and low temperature water 47 b are stored from the upper part to the lower part of the intermediate temperature water storage part 36. Here, the high temperature water 45 is, for example, hot water of 90 ° C. or higher. The low temperature water 47 is, for example, hot water of 5 ° C. or less. The intermediate temperature water 46 is hot water having a temperature between the high temperature water 45 and the low temperature water 47.

In the boiling operation, the heat pump unit 3 that is a heating device is used as a heat source.
Immediately after the heat pump unit 3 is started, it takes several minutes to several tens of minutes until the heat pump refrigerant circuit 15 is stabilized. That is, it takes time for the temperature of the refrigerant flowing in the refrigerant-water heat exchanger 12 to rise sufficiently. For this reason, until the heat pump refrigerant circuit 15 is stabilized, the low temperature water cannot be heated to the high temperature water 45 (for example, 90 ° C.) and becomes the medium temperature water 46. Therefore, when the intermediate hot water 46 is returned to the hot water storage section 35, the high temperature water 45a in the hot water storage section 35 and the intermediate hot water 46 are mixed, and the temperature of the high temperature water 45a is lowered. For this reason, it is required that the intermediate temperature water 46 generated when the heat pump unit 3 is started to flow into the hot water storage tank 2 so that the high temperature water 45a and the intermediate temperature water 46 in the hot water storage section 35 are not mixed.
The hot water storage type hot water supply apparatus according to the first embodiment prevents mixing of the high temperature water 45a and the intermediate temperature water 46 in the hot water storage section 35 by performing a boiling operation as follows.

  For example, when the user instructs the hot water storage hot water supply apparatus to perform a boiling operation using the setting panel 5 provided near the location where the hot water tap 4 or the heating terminal 6 is installed, the hot water storage hot water supply apparatus starts the boiling operation. In the boiling operation of the hot water storage type hot water supply apparatus, the temperature detected by a predetermined high temperature water temperature sensor 34 (for example, the high temperature water temperature sensor 34b) becomes lower than an arbitrary set temperature (for example, 30 ° C.), When it is determined that the amount of the high temperature water 45a in the hot water storage section 35 has decreased, the boiling operation of the hot water storage type hot water supply apparatus may be started.

  As shown in FIG. 3, when an instruction for a heating operation is received, the hot water storage type hot water supply device operates a boiling return switching valve 51. Then, the boiling return switching valve 51 is switched so that the boiling connection pipe 44 and the boiling hot water return pipe 52 communicate with each other. The hot water storage type hot water supply apparatus drives the heat pump refrigerant circuit 15 and the heat pump circulation pump 16. The driving of the heat pump refrigerant circuit 15 and the heat pump circulation pump 16 is controlled by, for example, a heat pump control circuit 17 provided in the heat pump unit 3. The heat pump control circuit 17 can be installed at an arbitrary position. For example, the heat pump control circuit 17 may be installed in the hot water storage tank unit 1.

  When the heat pump circulation pump 16 is driven, the low-temperature water 47 (47a, 47b) stored in the lower part of the hot water storage tank is sent to the refrigerant-water heat exchanger 12 via the low-temperature water extraction pipe 9. The low-temperature water 47 is heated by the refrigerant flowing through the refrigerant-water heat exchanger 12. As described above, until the heat pump unit 3 is stabilized (at the start of the heating operation), the low-temperature water 47 that has flowed into the refrigerant-water heat exchanger 12 is heated only up to the medium-temperature water 46. The intermediate warm water 46 flows into the intermediate warm water storage unit 36 through the boiling connection pipe 44, the boiling return switching valve 51, the boiling intermediate warm water return pipe 52, and the intermediate warm water upper pipe 27.

  As shown in FIG. 4, when the heat pump unit 3 is stabilized, the hot water storage type hot water supply apparatus switches the boiling return switching valve 51 so that the boiling connection pipe 44 and the boiling return pipe 10 communicate with each other. As described above, after the heat pump unit 3 is stabilized, the low temperature water 47 flowing into the refrigerant-water heat exchanger 12 is heated to the high temperature water 45. The high temperature water 45 flows into the hot water storage unit 35 through the boiling connection pipe 44, the boiling return switching valve 51, and the boiling return pipe 10.

  Note that it is possible to determine whether or not the heat pump unit 3 is stable by various methods. For example, when the temperature detected by the boiling temperature sensor 23 that detects the temperature of hot water heated by the refrigerant-water heat exchanger 12 is stable, it may be determined that the heat pump unit 3 is stable. For example, when the temperature detected by the boiling temperature sensor 23 is equal to or higher than a predetermined temperature (for example, 90 ° C.), it may be determined that the heat pump unit 3 is stable. Further, for example, when a predetermined time has elapsed from the start of driving of the heat pump unit 3, the heat pump unit 3 may be determined to be stable. When it is determined whether or not the heat pump unit 3 has been stabilized based on the time from the start of driving of the heat pump unit 3, the boiling temperature sensor 23 becomes unnecessary. Therefore, it is possible to reduce the cost of the hot water storage type hot water supply apparatus, and it becomes very easy to control the boiling return switching valve 51.

  In the hot water storage type hot water supply apparatus configured as described above, since the upper part of the intermediate hot water storage part 36 and the hot water storage part 35 are separated by the partition part 38, the intermediate hot water 46 generated at the start of the boiling operation is the intermediate hot water storage part. Even if it flows into 36, it does not mix with the high temperature water 45a stored in the hot water storage section 35. Therefore, even if the medium-temperature water 46 generated by the boiling operation flows into the medium-temperature water storage unit 36, the temperature of the high-temperature water 45a stored in the hot-water storage unit 35 can be prevented from decreasing, and the high-temperature in the hot-water storage unit 35 can be prevented. Water shortage can be resolved.

  Further, when the intermediate warm water 46 generated by the boiling operation flows into the intermediate warm water storage section 36, the intermediate warm water storage section 36 is filled with the intermediate warm water 46b and the low temperature water 47b with almost no high temperature water 45b. It is in a state. That is, most of the high-temperature water 45 stored in the hot water storage tank 2 is stored in the hot water storage unit 35. For this reason, even if the intermediate warm water 46 generated by the boiling operation flows into the intermediate warm water storage unit 36, the temperature of the high temperature water 45 stored in the entire hot water storage tank 2 is not lowered. For this reason, the hot water storage tank 2 as a whole has a remarkable effect that the shortage of high-temperature water can be solved. (The reason why the high temperature water 45b hardly exists in the medium temperature water storage unit 36 will be described later in the hot water supply operation).

  Further, in the hot water storage tank 2, most of the hot water storage part 35 is covered with the medium temperature water storage part 36. That is, most of the side surface portion of the hot water storage tank 2 is inscribed with the intermediate warm water 46b or the low temperature water 47b stored in the intermediate warm water storage portion. For this reason, the temperature difference between the wall surface temperature of the hot water storage tank 2 and the outside air temperature becomes small, and heat leakage from the hot water storage tank 2 to the outside air can be suppressed. Therefore, the heat retention capacity of the hot water storage tank 2 increases, and the energy required for re-boiling can be reduced. That is, the energy saving performance of the hot water storage type hot water supply apparatus can be improved.

  Further, when the boiling operation is continued, the high temperature water 45a increases and the low temperature water 47a, 47b decreases. As the low temperature water 47a and 47b decrease, the intermediate warm water 46a stored in the hot water storage section 35 moves to the intermediate warm water storage section 36 via the bottom communication section 25. Thereby, since the intermediate warm water 46 can be concentrated in the intermediate warm water storage part 36, more hot water 45 a can be stored in the hot water storage part 35. Therefore, the shortage of hot water in the hot water storage tank 2 can be solved.

(Hot-water supply operation)
Next, an operation when the hot water storage type hot water supply apparatus performs only the hot water supply operation will be described.
FIG. 5 is an operation explanatory diagram when the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention performs only the hot water supply operation.

Since the medium-temperature water 46 has a low temperature as a heat source for heating operation, the medium-temperature water 46 cannot be used as a heat source for heating operation.
Further, the energy consumption efficiency (hereinafter referred to as COP) when the medium temperature water 46 is heated to about 90 ° C. (high temperature water 45) by the heat pump unit 3 is about 1 to 2. On the other hand, the energy consumption efficiency (COP) when the low-temperature water 47 is heated to about 90 ° C. (high-temperature water 45) by the heat pump unit 3 is about 3 to 4. That is, in the boiling operation, when the low temperature water 47 is heated to the high temperature water 45, the COP is reduced when the medium temperature water 46 is heated to the high temperature water 45. For this reason, it is calculated | required that the intermediate temperature water 46 should be preferentially utilized for hot water supply. Note that COP is energy consumption efficiency represented by heating amount / power consumption.
The hot water storage type hot water supply apparatus according to Embodiment 1 preferentially uses the medium hot water 46 for hot water supply by performing a hot water supply operation as follows.

  When the hot water user sets the required hot water temperature on the setting panel 5 (hereinafter referred to as the required hot water temperature), the detected temperature of the hot water temperature sensor 39a for the middle hot water provided on the uppermost side of the hot water storage tank 2 and the required hot water temperature Are compared.

  When the temperature detected by the hot water temperature sensor 39a for the intermediate hot water is equal to or higher than the required hot water supply temperature, the intermediate hot water mixing valve 28 is opened so that only hot water flowing from the intermediate hot water upper pipe 27 flows out from the intermediate hot water mixing valve downstream pipe 48. Adjust the degree. Thereby, only the intermediate warm water 46 b stored in the intermediate warm water storage part 36 flows out from the intermediate warm water mixing valve downstream pipe 48 via the intermediate warm water upper pipe 27 and the intermediate warm water mixing valve 28. At this time, it is confirmed by the intermediate warm water mixing temperature sensor 29 attached to the intermediate warm water mixing valve downstream pipe 48 that the temperature of the hot water flowing through the intermediate warm water mixing valve downstream pipe 48 is equal to or higher than the required hot water supply set temperature.

  The intermediate warm water 46 flowing out from the intermediate warm water mixing valve downstream pipe 48 flows into the hot water supply mixing valve 30. The opening degree of the hot water supply mixing valve 30 is adjusted so that the mixed hot water of the intermediate temperature water 46 flowing in from the intermediate hot water mixing valve downstream pipe 48 and the low temperature water 47 flowing in from the hot water supply water supply pipe 31 becomes the required hot water supply temperature. . Thereby, the hot water having the required hot water supply temperature is supplied from the hot water tap 4 through the hot water supply mixing valve downstream pipe 32. At this time, the hot water temperature sensor 33 attached to the hot water mixing valve downstream pipe 32 confirms that the temperature of the hot water flowing through the hot water mixing valve downstream pipe 32 is the required hot water setting temperature.

  When the detected temperature of the hot water temperature sensor 39a for the intermediate hot water is lower than the required hot water supply temperature, or when the detected temperature of the intermediate hot water mixed temperature sensor 29 is lower than the required hot water supply temperature, the intermediate hot water mixing valve 28 is connected via the hot water supply pipe 7. Then, the opening degree is adjusted so that the mixed hot water of the hot water 45a of the hot water storage section 35 flowing in and the intermediate hot water 46b flowing from the intermediate hot water upper pipe 27 becomes equal to or higher than the required hot water supply temperature. At this time, it is confirmed by the intermediate warm water mixing temperature sensor 29 attached to the intermediate warm water mixing valve downstream pipe 48 that the temperature of the hot water flowing through the intermediate warm water mixing valve downstream pipe 48 is equal to or higher than the required hot water supply set temperature.

  In the hot water storage type hot water supply apparatus configured as described above, when the temperature of the intermediate hot water 46b is equal to or higher than the required hot water supply temperature, the intermediate hot water 46b can be preferentially used for hot water supply. Further, even when the temperature of the intermediate warm water 46b is lower than the required hot water supply temperature, the hot water 45a and the intermediate warm water 46b are mixed with hot water having a temperature higher than the required hot water temperature by the intermediate warm water mixing valve 28. Hot water at a desired temperature can be supplied.

  Further, since the intermediate hot water storage section 36 and the hot water storage section 35 communicate with each other in the vicinity of the lower portion of the hot water storage tank 2, the intermediate hot water 46b stored in the intermediate hot water storage section 36 is reduced and stored in the hot water storage section 35. The low-temperature water 47 a that is moving moves to the medium-temperature water storage unit 36 via the bottom communication unit 25. For this reason, the intermediate warm water 46b is constantly stored in the upper part of the intermediate warm water storage part 36. Therefore, all of the medium-temperature water 46b can be taken out and used up for hot water supply by the medium-temperature water upper pipe 27 connected to the upper part of the medium-temperature water storage unit 36.

  Further, when the intermediate temperature water 46b of the intermediate temperature water storage unit 36 is used for hot water supply, the low temperature water 47a is supplied to the intermediate temperature water storage unit 36 as described above. That is, the high temperature water 45 b is hardly present in the medium temperature water storage unit 36. For this reason, even if the intermediate warm water 46 generated at the start of the boiling operation flows into the intermediate warm water storage unit 36, the temperature of the hot water 45 stored in the entire hot water storage tank 2 is not lowered.

  As described above, since the medium warm water 46b stored in the medium warm water storage unit 36 can be preferentially taken out, the medium warm water 46b can be preferentially used for hot water supply. Further, the hot water 46 stored in the entire hot water storage tank 2 can be reduced, and more hot water 45 can be stored. For this reason, the shortage of high temperature water in the hot water storage tank 2 can be solved.

  Furthermore, since the intermediate temperature water 46b is preferentially used for hot water supply, the low temperature water 47 is heated in the boiling operation. For this reason, the heat pump unit 3 can ensure a high COP.

In the first embodiment, the temperature of the intermediate warm water 46b stored in the intermediate warm water storage unit 36 is detected only by the hot water temperature sensor 39a for intermediate warm water. By detecting the temperature of the medium-temperature water 46b stored in the medium-temperature water storage unit 36 by the medium-temperature water-use hot water temperature sensors 39a to 39e, the medium-temperature water 46b exceeding the required hot water supply temperature stored in the medium-temperature water storage unit 36 is obtained. The existing height can be detected. That is, by adding the cross-sectional area of the intermediate temperature water storage unit 36 to the height at which the intermediate temperature water 46b above the required hot water supply temperature exists, the medium temperature water 46b above the required hot water supply temperature stored in the intermediate temperature water storage unit 36 is obtained. The amount can be detected. Thereby, the control of the intermediate temperature water mixing valve 28 becomes easy. Here, in the first embodiment, the case where five hot water temperature sensors 39 for medium temperature water are provided is shown, but by storing more hot water temperature sensors 39 for medium temperature water, it is stored in the medium temperature water storage unit 36. The height and amount of the medium-temperature water 46b that is equal to or higher than the requested hot water supply temperature can be detected with higher accuracy.
Moreover, although the case where the five temperature sensors 34 for high temperature water were provided was shown, the height and quantity of the high temperature water 45a stored in the hot water storage part 35 are provided by providing more hot water temperature sensors 34 for high temperature water. Can be detected with higher accuracy.

  In the first embodiment, the hot water temperature sensor 34 for high temperature water and the hot water temperature sensor 39 for medium temperature water are provided outside the side surface of the hot water tank 2, but may be provided so as to penetrate the wall surface of the hot water tank 2, for example. Good. For example, the hot water temperature sensor 34 for high temperature water and the hot water temperature sensor 39 for medium temperature water may be provided so as to be immersed directly in hot water stored in the hot water storage tank 2.

  Further, when the temperature of the intermediate warm water 46b stored in the intermediate warm water storage unit 36 is lower than the required hot water supply temperature, only the intermediate warm water mixing valve 28 may be operated without operating the hot water supply mixing valve 30. That is, the hot water 45a stored in the hot water storage unit 35 and the intermediate hot water 46b or the low temperature water 47b stored in the intermediate hot water storage unit 36 are mixed, and the mixed hot water is adjusted to the required hot water supply temperature. May be. In this way, since only the intermediate hot water mixing valve 28 is controlled, the controllability of the hot water storage type hot water supply apparatus becomes easy.

(Heating operation)
Next, an operation when the hot water storage type hot water supply apparatus performs only the heating operation will be described.
FIG. 6 is an operation explanatory diagram when the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention performs only the heating operation. A heating fluid such as water is circulated in the heating circuit 24 by a heating terminal circulation pump 26. The heated fluid is heated by the heat exchanger 18 to the high-temperature water 45 flowing through the heat exchanger 18 and is radiated by the heating terminal 6. For example, when the heating terminal 6 is used for floor heating, the heating terminal 6 is installed under the floor or the like, and the heated fluid radiates heat at the heating terminal 6 to perform floor heating. The heating terminal 6 may be a heater such as a bathroom, a dryer, a hot water heater in a room, or the like.

The high temperature water 45 flowing through the heat exchanger 18 is high temperature water 45 a stored in the hot water storage unit 35. The hot water 45 flows into the heat exchanger 18 from the hot water storage unit 35 via the hot water supply pipe 7 and the high temperature water discharge pipe 19 when the heating circulation pump 22 is activated. The high-temperature water 45 that has flowed into the heat exchanger 18 radiates heat to the heated fluid that flows through the heat exchanger 18 and becomes medium-temperature water 46. If the intermediate warm water 46 is returned to the hot water storage unit 35 as it is, the intermediate hot water 46 and the high temperature water 45a stored in the hot water storage unit 35 are mixed, and the temperature of the high temperature water 45a decreases. For this reason, it is required that the intermediate hot water 46 generated by the heating operation flow into the hot water storage tank 2 so as not to be mixed with the high temperature water 45a stored in the hot water storage unit 35.
The hot water storage type hot water supply apparatus according to the first embodiment prevents the mixing of the medium temperature water 46 generated by the heating operation and the high temperature water 45a stored in the hot water storage unit 35 by performing the heating operation as follows. ing.

  When the user instructs to start the heating operation on the setting panel 5, the heating hot water return valve 50 provided in the heating hot water return pipe 49 is opened, and the heating circulation pump 22 provided in the intermediate hot water lower pipe 20 is opened. Starts. Moreover, the heating terminal circulation pump 26 provided in the heating circuit 24 is started.

  When the heating hot water return valve 50 is opened and the heating circulation pump 22 is activated, the high temperature water 45a stored in the hot water storage section 35 flows into the heat exchanger 18 through the hot water piping 7 and the high temperature water outlet piping 19. To do. The high-temperature water 45 that has flowed into the heat exchanger 18 radiates heat to the heated fluid that flows through the heat exchanger 18 and becomes medium-temperature water 46. The intermediate warm water 46 flows into the intermediate warm water storage unit 36 via the intermediate warm water lower pipe 20, the heating intermediate warm water return pipe 49, and the intermediate warm water upper pipe 27.

  In the hot water storage type hot water supply apparatus configured as described above, the intermediate hot water 46 generated by the heating operation can be allowed to flow into the intermediate hot water storage unit 36 without being mixed with the high temperature water 45a stored in the hot water storage unit 35. it can. For this reason, the temperature fall of the high temperature water 45a stored in the hot water storage part 35 can be prevented, and the shortage of high temperature water in the hot water storage tank 2 can be eliminated.

  When the heating operation continues, the amount of the intermediate warm water 46b stored in the intermediate warm water storage unit 36 increases. However, in the hot water storage tank 2 according to the first embodiment, the intermediate hot water storage part 36 is provided along the side surface of the hot water storage tank 2, and the volume of the intermediate hot water storage part 36 is ensured to be large. For this reason, it can suppress that the warm water 46b which flowed into the warm water storage part 36 flows into the hot water storage part 35. FIG. Therefore, more hot water 45a can be stored in the hot water storage section 35, and the shortage of hot water in the hot water storage tank 2 can be solved.

(Boiling operation and hot water supply operation)
Next, an operation when the hot water storage type hot water supply apparatus performs the boiling operation and the hot water supply operation simultaneously will be described.
7 and 8 are operation explanatory views when the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention simultaneously performs the boiling operation and the hot water supply operation, and FIG. 7 is a state before the heat pump unit 3 is stabilized. FIG. 8 is an operation explanatory view showing a state after the heat pump unit 3 is stabilized.

  The basic operation of the hot water storage type hot water supply apparatus in the boiling operation and the hot water supply operation is the same as the operation only in the boiling operation and the operation only in the hot water supply operation described above. However, the operation of returning the intermediate warm water 46 generated at the start of the boiling operation (before the heat pump unit 3 is stabilized) to the intermediate warm water storage unit 36 of the hot water storage tank 2 and the intermediate warm water 46b from the intermediate warm water storage unit 36 in the hot water supply operation. When the operation of taking out overlaps, a part or all of the intermediate warm water 46 generated at the start of the boiling operation is caused to flow into the intermediate warm water mixing valve 28 without returning to the intermediate warm water storage unit 36. And a part or all of this middle temperature water 46 is utilized for hot water supply. This operation is different from the above basic operation.

  As shown in FIG. 8, after the heat pump unit 3 is stabilized, the boiling return switching valve 51 is switched so that the boiling connection pipe 44 and the boiling return pipe 10 communicate with each other, and the hot water 45 is transferred to the hot water storage section 35. Let it flow.

  In the hot water storage type hot water supply apparatus configured as described above, the amount of the intermediate warm water 46b stored in the intermediate warm water storage unit 36 is reduced. For this reason, the volume of the hot water storage part 36 can be reduced, and the volume of the hot water storage part 35 can be increased accordingly. Therefore, the shortage of hot water in the hot water storage tank 2 can be solved.

(Hot-water supply operation and heating operation)
Next, an operation when the hot water storage type hot water supply apparatus performs the hot water supply operation and the heating operation simultaneously will be described.
FIG. 9 is an operation explanatory diagram when the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention performs the hot water supply operation and the heating operation simultaneously.

  The basic operation of the hot water storage type hot water supply apparatus in the hot water supply operation and the heating operation is the same as the operation of only the hot water supply operation and the operation of only the heating operation described above. However, when the operation of taking out the intermediate warm water 46b from the intermediate warm water storage unit 36 in the hot water supply operation and the heating operation overlap, a part or all of the intermediate warm water 46 generated by the heating operation is returned to the intermediate warm water storage unit 36. Instead, it flows into the medium warm water mixing valve 28. And a part or all of this middle temperature water 46 is utilized for hot water supply. This operation is different from the above basic operation.

  In the hot water storage type hot water supply apparatus configured as described above, the amount of the intermediate warm water 46b stored in the intermediate warm water storage unit 36 is reduced. For this reason, the volume of the hot water storage part 36 can be reduced, and the volume of the hot water storage part 35 can be increased accordingly. Therefore, the shortage of hot water in the hot water storage tank 2 can be solved.

(Boiling operation and heating operation)
Next, the operation when the hot water storage type hot water supply apparatus performs the boiling operation and the heating operation simultaneously will be described.
FIG. 10 is an operation explanatory diagram when the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention performs the boiling operation and the heating operation at the same time.

  The operation of the hot water storage type hot water supply apparatus in the boiling operation and the heating operation is the same as the operation only in the boiling operation and the operation only in the hot water supply operation described above. In other words, when the operation of returning the medium-temperature water 46 generated at the start of the boiling operation (before the heat pump unit 3 is stabilized) to the medium-temperature water storage unit 36 of the hot water storage tank 2 and the heating operation are overlapped, both operations occurred. The intermediate temperature water 46 is caused to flow into the intermediate temperature water storage unit 36.

  After the heat pump unit 3 is stabilized, the boiling return switching valve 51 is switched so that the boiling connection pipe 44 and the boiling return pipe 10 communicate with each other, and the high temperature water 45 flows into the hot water storage section 35.

  In the hot water storage type hot water supply apparatus configured in this way, even when the boiling operation and the heating operation are performed simultaneously, the hot water is not mixed with the high temperature water 45a stored in the hot water storage unit 35 and is generated in both operations. The warm water 46 can be caused to flow into the medium warm water storage unit 36. Therefore, the shortage of hot water in the hot water storage tank 2 can be solved.

(Boiling operation, hot water supply operation and heating operation)
Next, an operation when the hot water storage type hot water supply apparatus performs all of the boiling operation, the hot water supply operation, and the heating operation simultaneously will be described.
FIG. 11 is an operation explanatory diagram when the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention performs all of the boiling operation, the hot water supply operation, and the heating operation at the same time.

  The basic operation of the hot water storage type hot water supply apparatus in the boiling operation, the hot water supply operation, and the heating operation is the same as the above-described operation only in the boiling operation and only the hot water supply operation. However, the operation of returning the intermediate warm water 46 generated at the start of the boiling operation (before the heat pump unit 3 is stabilized) to the intermediate warm water storage unit 36 of the hot water storage tank 2 and the intermediate warm water 46b from the intermediate warm water storage unit 36 in the hot water supply operation. When the operation to take out and the heating operation overlap, a part or all of the intermediate warm water 46 generated at the start of the boiling operation and a part or all of the intermediate warm water 46 generated in the heating operation are stored in the intermediate warm water storage unit. Without returning to 36, the medium warm water mixing valve 28 is allowed to flow. And a part or all of this middle temperature water 46 is utilized for hot water supply. This operation is different from the above basic operation.

  After the heat pump unit 3 is stabilized, the boiling return switching valve 51 is switched so that the boiling connection pipe 44 and the boiling return pipe 10 communicate with each other, and the high temperature water 45 flows into the hot water storage section 35.

  In the hot water storage type hot water supply apparatus configured as described above, the amount of the intermediate warm water 46b stored in the intermediate warm water storage unit 36 is reduced. For this reason, the volume of the hot water storage part 36 can be reduced, and the volume of the hot water storage part 35 can be increased accordingly. Therefore, the shortage of hot water in the hot water storage tank 2 can be solved.

  As described above, according to the hot water storage type hot water supply apparatus according to Embodiment 1, each of the hot water supply operation, the boiling operation, and the heating operation that is the main operation of the hot water storage type hot water supply apparatus is performed independently, Each driving operation can be performed simultaneously. Thereby, the intermediate warm water 46b stored in the intermediate warm water storage part 36 can be effectively used for hot water supply. Further, when the intermediate warm water 46 generated by the boiling operation or the heating operation flows into the intermediate warm water storage unit 36, the intermediate warm water 46 generated by both operations is not mixed with the high temperature water 45a stored in the hot water storage unit 35. Can be caused to flow into the medium-temperature water storage unit 36. Therefore, a lot of high temperature water 45a can be stored in the hot water storage section 35, and the shortage of high temperature water in the hot water storage tank 2 can be solved.

  Further, since the hot water supply pipe 7, the boil-up return pipe 10 and the intermediate hot water upper pipe 27 are connected to the upper part of the hot water storage tank 2, and the water supply pipe 8 is connected to the lower part of the hot water storage tank 2, the hot water storage tank 2 having a substantially cylindrical shape. There is no need to connect piping to the side. For this reason, manufacture of the hot water storage tank 2 becomes easy.

  In the hot water storage type hot water supply apparatus according to the first embodiment, the boiling intermediate warm water return pipe 52 is connected to the intermediate warm water upper pipe 27, but the boiling intermediate warm water return pipe 52 and the intermediate warm water upper pipe 27 are not connected. In addition, each may be connected to the hot water storage tank 2. Moreover, although the hot water storage type hot water supply apparatus according to the first embodiment connected the heating hot water return pipe 49 to the intermediate warm water upper pipe 27, without connecting the heating hot water return pipe 49 and the intermediate hot water upper pipe 27, Each may be connected to the hot water storage tank 2.

  FIG. 12 is a schematic configuration diagram illustrating another example of the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. In this hot water storage type hot water supply apparatus, the boiling hot water return pipe 52, the intermediate hot water upper pipe 27, and the heating hot water return pipe 49 are separately connected to the hot water storage tank 2. More specifically, the boiling intermediate warm water return pipe 52 is connected to the upper side of the side surface of the hot water storage tank 2 in a range inscribed in the intermediate warm water storage section 36. The intermediate warm water upper pipe 27 is connected to the upper part of the hot water storage tank 2 in a range inscribed in the intermediate warm water storage part 36. Further, the heating hot water return pipe 49 is connected to the upper side of the side surface of the hot water storage tank 2 in the range inscribed in the intermediate hot water storage part 36. Even in such a configuration, since the intermediate warm water upper pipe 27 is connected to the upper part of the intermediate warm water storage section 36, all of the intermediate warm water 46b stored in the intermediate warm water storage section 36 is taken out and used up for hot water supply. Can do.

  Further, the intermediate warm water upper pipe 27 may be connected to a side surface portion of the hot water storage tank 2 in a range inscribed in the intermediate warm water storage portion 36. By connecting the middle warm water upper pipe 27 in the vicinity of the upper part of the side surface of the hot water storage tank 2 in a range inscribed in the middle warm water storage section 36, most of the middle warm water 46b stored in the middle warm water storage section 36 is taken out for hot water supply. Can be used up.

Moreover, as shown in FIG. 13, the inside of the hot water storage tank 2 may be divided.
FIG. 13 is a cross-sectional view showing another example of the hot water storage tank according to Embodiment 1 of the present invention. In addition, this FIG. 13 has shown the cross-sectional view in the same position as cut surface AA shown in FIG.
The inside of the hot water storage tank 2 is divided into two hot water storage parts by a substantially flat partition 38 extending in the vertical direction (substantially vertical direction). In the hot water storage tank 2, the hot water storage section 35 occupies a range of more than half in the cross section. That is, in the cross section, the wall surface communication portion 21 is at least half the circumference of the wall surface of the hot water storage tank 2. By making the partition part 38 into a substantially flat plate shape, the hot water storage part 35 and the intermediate temperature water storage part 36 can be easily divided. Accordingly, the hot water storage tank 2 can be easily manufactured.

Embodiment 2. FIG.
In Embodiment 1, the hot water storage tank 2 is formed with the wall surface communication portion 21 (the range where the hot water storage portion 35 and the side surface portion of the hot water storage tank 2 are in contact), but the hot water storage tank 2 is manufactured without forming the wall surface communication portion 21. May be. In the second embodiment, items that are not particularly described are the same as those in the first embodiment, and the same functions and configurations are described using the same reference numerals.

FIG. 14: is a schematic block diagram which shows the hot water storage type hot water supply apparatus which concerns on Embodiment 2 of this invention. FIG. 15 is a BB cross-sectional view of the hot water storage tank shown in FIG.
The hot water storage tank 2 has a substantially cylindrical shape with its upper and lower portions closed. And the partition part 38 extended in the up-down direction (substantially perpendicular direction) is provided in the hot water storage tank 2. As shown in FIG. The partition portion 38 has a substantially cylindrical shape that is slightly smaller than the hot water storage tank 2. The upper part of this partition part 38 is joined to the inner wall of the hot water storage tank 2, and the interior of the hot water storage tank 2 is divided into two hot water storage parts. Of these two hot water storage portions, the hot water storage portion formed between the inner side surface of the hot water storage tank 2 and the outer side surface portion of the partition portion 38 is an intermediate hot water storage portion 36. Further, the hot water storage part formed inside the side surface part of the partition part 38 is a hot water storage part 35. That is, the wall surface communication part 21 is not formed in the hot water storage tank 2. In addition, since the vertical length of the partition part 38 is smaller than the vertical length of the hot water storage tank 2, the hot water storage part 35 and the intermediate hot water storage part 36 communicate with each other in the vicinity of the lower part of the hot water storage tank 2.
In addition, as shown in FIG. 24, the partition part 38 is extended to the up-down direction of the hot water storage tank 2, the upper part and the lower part of the partition part 38 are joined, and the communication hole which penetrates the partition part 38 is provided in the lower part of the partition part 38. Thus, the communication part 25 may be formed. In this case, since the partition part 38 is connected by the upper part and the lower part of the hot water storage tank 2, the attachment intensity | strength of the partition part 38 can be made high.
Moreover, the partition part 38 and the hot water storage tank 2 may be integrally formed.

  A hot water temperature sensor 34 for high temperature water and a hot water temperature sensor 39 for medium temperature water are provided outside the side surface of the hot water storage tank 2. The hot water temperature sensor 34 is a temperature sensor that detects the temperature of hot water stored in the hot water storage unit 35. The hot water temperature sensor 34 for high temperature water is provided with a temperature detecting portion penetrating the side surface portion of the hot water storage tank 2 and the side surface portion of the partition portion 38, and detects the temperature of the hot water stored in the hot water storage portion 35. It is possible. In the hot water temperature sensor 34 for hot water, five hot water temperature sensors 34 a to 34 e for hot water are provided at predetermined intervals along the vertical direction of the hot water storage tank 2. The hot water temperature sensor 39 for intermediate temperature water is a temperature sensor that detects the temperature of hot water stored in the intermediate temperature water storage unit 36. The hot water temperature sensor 39 for intermediate hot water is provided on the side surface of the hot water storage tank 2 in a range where the intermediate hot water storage portion 36 is inscribed. The medium temperature water hot water temperature sensor 39 is provided with five medium temperature water hot water temperature sensors 39 a to 39 e at predetermined intervals along the vertical direction of the hot water storage tank 2.

  By using the hot water temperature sensor 34 for high temperature water and the hot water temperature sensor 39 for medium temperature water, the temperature of the hot water stored in the hot water storage section 35 and the temperature of the hot water stored in the medium temperature water storage section 36 can be measured. It is possible. Note that the hot water temperature sensor 34 for high temperature water and the hot water temperature sensor 39 for medium temperature water may be provided so as to be immersed directly in hot water stored in the hot water storage tank 2, for example.

  In the hot water storage type hot water supply apparatus configured as described above, the entire periphery of the hot water storage section 35 is covered with the medium hot water storage section 36. For this reason, the temperature difference between the wall surface temperature of the hot water storage tank 2 and the outside air temperature becomes small, and heat leakage from the hot water storage tank 2 to the outside air can be suppressed. Therefore, the heat retention capacity of the hot water storage tank 2 increases, and the energy required for re-boiling can be reduced. That is, the energy saving performance of the hot water storage type hot water supply apparatus can be improved.

  Moreover, since it is not necessary to form the wall surface communication part 21 in the hot water storage tank 2, the partition part 38 can be manufactured in a substantially cylindrical shape. For this reason, manufacture of the hot water storage tank 2 becomes easy.

Note that the partition portion 38 may be connected to the inner wall of the hot water storage tank 2 such that the outer side surface portion of the partition portion 38 contacts the inner side surface of the hot water storage tank 2.
FIG. 16 is a cross-sectional view showing another example of a hot water storage tank according to Embodiment 2 of the present invention. In addition, this FIG. 16 has shown the cross-sectional view in the same position as cut surface BB shown in FIG. The hot water storage tank 2 has a substantially cylindrical shape with its upper and lower portions closed. And the partition part 38 extended in the up-down direction (substantially perpendicular direction) is provided in the hot water storage tank 2. As shown in FIG. The partition portion 38 has a substantially cylindrical shape that is slightly smaller than the hot water storage tank 2. The upper part of this partition part 38 is joined to the inner wall of the hot water storage tank 2, and the interior of the hot water storage tank 2 is divided into two hot water storage parts. Of these two hot water storage portions, the hot water storage portion formed between the inner side surface of the hot water storage tank 2 and the outer side surface portion of the partition portion 38 is an intermediate hot water storage portion 36. Further, the hot water storage part formed inside the side surface part of the partition part 38 is a hot water storage part 35.

  When the partition portion 38 is joined to the inner wall of the hot water storage tank 2, the outer side surface of the partition portion 38 and the inner side surface of the hot water storage tank 2 are in contact with each other. And the hot water temperature sensor 34 for high temperature water is provided in this contact part.

  In the hot water storage type hot water supply apparatus configured in this way, the hot water temperature sensor 34 for the high temperature water does not provide the temperature detection part through the side surface part of the hot water storage tank 2 and the side surface part of the partition part 38, and the hot water storage part 35. The temperature of the hot and cold water stored in the can be detected.

Embodiment 3 FIG.
By configuring the shape of the partition portion 38 connected to the inner wall of the hot water storage tank 2 as follows, it is possible to further improve the heat retaining power of the hot water storage tank 2. In Embodiment 3, items that are not particularly described are the same as those in Embodiments 1 and 2, and the same functions and configurations are described using the same reference numerals.

  FIG. 17 is a longitudinal sectional view showing a hot water storage tank according to Embodiment 3 of the present invention. The hot water storage tank 2 has a substantially cylindrical shape with its upper and lower portions closed. The interior of the hot water storage tank 2 is divided into two hot water storage parts by a substantially flat partition 38 that extends in the vertical direction (substantially vertical direction). Of these two hot water storage sections, the right hot water storage section in FIG. Further, the hot water storage section on the left side in FIG.

  In addition, a bent portion 38c having a substantially L-shaped longitudinal section protruding toward the center of the hot water storage tank 2 is formed at the lower portion of the partition portion 38, for example. Thereby, in the longitudinal section, the distance b from the lower side of the hot water storage tank 2 to the lower part of the partition part 38 is larger than the distance a from the upper side of the hot water storage tank 2 to the upper part of the partition part 38. That is, the intermediate temperature water storage portion 36 has a shape in which the lower cross-sectional area is larger than the upper cross-sectional area.

  The intermediate warm water stored in the intermediate warm water storage portion 36 by reducing the distance a from the upper side of the hot water storage tank 2 to the upper portion of the partition portion 38, that is, by reducing the cross-sectional area of the upper portion of the intermediate warm water storage portion 36. The height c of 46b can be increased.

In the hot water storage type hot water supply apparatus configured as described above, the area in which the intermediate hot water 46b stored in the intermediate hot water storage unit 36 covers the hot water storage unit 35 increases. That is, the high-temperature water 45a stored in the hot water storage unit 35 is more easily covered with the medium-temperature water 46b stored in the medium-temperature water storage unit 36. For this reason, the temperature difference between the hot water storage unit 35 and the intermediate hot water storage unit 36 is reduced, and heat leakage from the hot water storage unit 35 to the intermediate hot water storage unit 36 can be further suppressed. Therefore, the heat retention capacity of the hot water storage tank 2 is increased, and the energy required for re-boiling can be further reduced. That is, the energy saving performance of the hot water storage type hot water supply apparatus can be further improved.
Moreover, since the volume of the medium temperature water storage part 36 in the range where the distance from the lower side of the hot water storage tank 2 to the lower part of the partition part 38 is the distance b increases, the volume change of the medium temperature water 46b is absorbed by this part. It becomes possible. Thereby, since it can prevent that the middle temperature water 46b flows into the hot water storage part 35 via the communication part 25, the high temperature water 45a in the hot water storage tank 2 can be ensured. Therefore, the shortage of high temperature water can be resolved.

In addition, in Embodiment 3, the structure in which the upper part and the side part of the partition part 38 are connected to the hot water storage tank 2 is shown. However, as shown in FIG. 25, the partition part 38 is extended to the vertical direction of the hot water storage tank 2, In addition to the upper part and the side part of the partition part 38, the lower part may be further joined, and the communication part 25 may be formed by providing a communication hole penetrating the partition part 38 in the lower part of the partition part 38. In this case, since the partition part 38 is connected by the upper part, side part, and lower part of the hot water storage tank 2, the attachment intensity | strength of the partition part 38 can be made high.
In the third embodiment, the partition portion 38 is formed in a substantially flat plate shape, but the partition portion 38 may be formed in a substantially cylindrical shape.
FIG. 18 is a longitudinal sectional view showing another example of the hot water storage tank according to the third embodiment. The hot water storage tank 2 has a substantially cylindrical shape with its upper and lower portions closed. And the partition part 38 extended in the up-down direction (substantially perpendicular direction) is provided in the hot water storage tank 2. As shown in FIG. The partition portion 38 has a substantially cylindrical shape that is slightly smaller than the hot water storage tank 2. The upper part of this partition part 38 is joined to the inner wall of the hot water storage tank 2, and the interior of the hot water storage tank 2 is divided into two hot water storage parts. Of these two hot water storage portions, the hot water storage portion formed between the inner side surface of the hot water storage tank 2 and the outer side surface portion of the partition portion 38 is an intermediate hot water storage portion 36. Further, the hot water storage part formed inside the side surface part of the partition part 38 is a hot water storage part 35.

  In addition, a reduced diameter portion 38 d having a diameter smaller than that of the upper portion of the partition portion 38 is formed in the lower portion of the partition portion 38. Thereby, in the longitudinal section, the distance b from the lower side of the hot water storage tank 2 to the lower part of the partition part 38 is larger than the distance a from the upper side of the hot water storage tank 2 to the upper part of the partition part 38. That is, the intermediate temperature water storage portion 36 has a shape in which the lower cross-sectional area is larger than the upper cross-sectional area.

  Also in the hot water storage type hot water supply apparatus configured as described above, the area in which the intermediate warm water 46b stored in the intermediate warm water storage section 36 covers the hot water storage section 35 increases. That is, the high-temperature water 45a stored in the hot water storage unit 35 is more easily covered with the medium-temperature water 46b stored in the medium-temperature water storage unit 36. For this reason, the temperature difference between the hot water storage unit 35 and the intermediate hot water storage unit 36 is reduced, and heat leakage from the hot water storage unit 35 to the intermediate hot water storage unit 36 can be further suppressed. Therefore, the heat retention capacity of the hot water storage tank 2 is increased, and the energy required for re-boiling can be further reduced. That is, the energy saving performance of the hot water storage type hot water supply apparatus can be further improved.

Further, in the third embodiment, the partition portion 38 is provided in a substantially vertical direction, but the partition portion 38 may be inclined and provided in the hot water storage tank 2.
FIG. 19 is a longitudinal sectional view showing still another example of the hot water storage tank according to the third embodiment. The hot water storage tank 2 has a substantially cylindrical shape with its upper and lower portions closed. The interior of the hot water storage tank 2 is divided into two hot water storage portions by a substantially flat partitioning portion 38 that is inclined. Of these two hot water storage parts, the hot water storage part on the right side in FIG. Further, the hot water storage section on the left side in FIG.

  By providing the partition part 38 at an angle, the distance b from the lower part of the side surface of the hot water storage tank 2 to the lower part of the partition part 38 is longer than the distance a from the upper part of the side surface of the hot water storage tank 2 to the upper part of the partition part 38 in the longitudinal section. Is also getting bigger. That is, the intermediate temperature water storage portion 36 has a shape in which the lower cross-sectional area is larger than the upper cross-sectional area.

  Also in the hot water storage type hot water supply apparatus configured as described above, the area in which the intermediate warm water 46b stored in the intermediate warm water storage section 36 covers the hot water storage section 35 increases. That is, the high-temperature water 45a stored in the hot water storage unit 35 is more easily covered with the medium-temperature water 46b stored in the medium-temperature water storage unit 36. For this reason, the temperature difference between the hot water storage unit 35 and the intermediate hot water storage unit 36 is reduced, and heat leakage from the hot water storage unit 35 to the intermediate hot water storage unit 36 can be further suppressed. Therefore, the heat retention capacity of the hot water storage tank 2 is increased, and the energy required for re-boiling can be further reduced. That is, the energy saving performance of the hot water storage type hot water supply apparatus can be further improved.

  As described above, in the longitudinal section, if the distance b from the lower side of the hot water storage tank 2 to the lower part of the partition part 38 is larger than the distance a from the upper side of the hot water storage tank 2 to the upper part of the partition part 38, That is, the above-described effect can be obtained if the medium-temperature water storage unit 36 has a shape in which the lower cross-sectional area is larger than the upper cross-sectional area.

Embodiment 4 FIG.
The hot water storage tank 2 is often stored and installed in the casing 100. Considering the storage configuration of the hot water storage tank 2 in the casing 100, the heat retaining power of the hot water storage tank 2 can be further improved. Here, the casing 100 corresponds to the housing of the present invention.

  FIG. 20 is a cross-sectional view of a hot water storage tank and casing according to Embodiment 4 of the present invention. The hot water storage tank 2 has a substantially cylindrical shape with its upper and lower portions closed. And the partition part 38 extended in the up-down direction (substantially perpendicular direction) is provided in the hot water storage tank 2. As shown in FIG. The partition portion 38 has a substantially cylindrical portion 38 a that is slightly smaller than the hot water storage tank 2. A part of the side surface of the cylindrical portion 38a is cut, and a protruding edge 38b protruding in the outer peripheral direction is formed at the cut portion.

  The upper part of the cylindrical part 38a and the protruding edge 38b and the side part of the protruding edge 38b are joined to the inner wall of the hot water storage tank 2, and the interior of the hot water storage tank 2 is divided into two hot water storage parts. Of these two hot water storage portions, the hot water storage portion formed between the inner side surface of the hot water storage tank 2 and the outer side surface portion of the partition portion 38 is an intermediate hot water storage portion 36. A hot water storage section formed between the inner side surface of the hot water storage tank 2 and the inner side surface of the partition section 38 is a hot water storage section 35. At this time, since the vertical length of the partition portion 38 is smaller than the vertical length of the hot water storage tank 2, the hot water storage portion 35 and the intermediate hot water storage portion 36 are communicated with each other in the vicinity of the lower portion of the hot water storage tank 2.

  The hot water storage tank 2 is housed in a casing 100 having a substantially rectangular cross section. In a state where the hot water storage tank 2 is stored in the casing 100, the distance between the side surface portion of the hot water storage tank 2 and the casing 100 in the range in which the intermediate temperature water storage portion 36 is inscribed is inscribed by the hot water storage portion 35 (wall surface communication portion 21). It is closer than the distance between the side surface of the hot water storage tank 2 in the range and the casing 100.

  The temperature of the side surface portion of the hot water storage tank 2 in the range where the intermediate temperature water storage portion 36 is inscribed is lower than the temperature of the side surface portion of the hot water storage tank 2 in the range where the hot water storage portion 35 (wall surface communication portion 21) is inscribed. For this reason, the intermediate temperature water storage part 36 is disposed at a position where the distance from the hot water storage tank 2 to the casing 100 is reduced, and the hot water storage part 35 (wall surface communication part 21) is provided at a position where the distance from the hot water storage tank 2 to the casing 100 is increased. By disposing the side surface portion of the hot water storage tank 2 in the inscribed range, heat leakage from the hot water storage tank 2 to the casing 100 can be suppressed. Therefore, the heat retention capacity of the hot water storage tank 2 increases, and the energy required for re-boiling can be reduced. That is, the energy saving performance of the hot water storage type hot water supply apparatus can be improved.

When the casing 100 has a substantially square cross section and the distance between the side surface portion of the hot water storage tank 2 and the casing 100 in the range where the hot water storage portion 35 (wall surface communication portion 21) is inscribed is close to FIG. As shown, the hot water storage tank 2 may be stored in the casing 100.
FIG. 21 is a cross-sectional view showing another example of a hot water storage tank and casing according to Embodiment 4 of the present invention. In the casing 100, a heat insulating material 53 having a high heat insulating performance such as a vacuum heat insulating material is provided in a range facing the side surface portion of the hot water storage tank 2 in a range where the hot water storage portion 35 (wall surface communication portion 21) is inscribed. ing. By comprising in this way, the heat leak from the side part of the hot water storage tank 2 of the range which the hot water storage part 35 (wall surface communication part 21) inscribes to the casing 100 can be suppressed. Therefore, the heat retention capacity of the hot water storage tank 2 increases, and the energy required for re-boiling can be reduced. That is, the energy saving performance of the hot water storage type hot water supply apparatus can be improved.

Further, in the case where the transverse cross section of the casing 100 is substantially square, etc., when the distance between the side surface portion of the hot water storage tank 2 and the casing 100 in the range where the hot water storage portion 35 (wall surface communication portion 21) is inscribed is close to FIG. As shown, the hot water storage tank 2 may be stored in the casing 100.
FIG. 22 is a cross-sectional view showing still another example of a hot water storage tank and casing according to Embodiment 4 of the present invention. The hot water storage tank 2 is housed in the casing 100 so that the side surface of the hot water storage tank 2 in the range where the hot water storage section 35 (wall surface communication section 21) is inscribed faces the corner of the casing 100. By comprising in this way, the distance of the side part of the hot water storage tank 2 and the casing 100 of the range which the hot water storage part 35 (wall surface communication part 21) inscribes can be increased. For this reason, the heat leak from the side part of the hot water storage tank 2 in the range where the hot water storage part 35 (wall surface communication part 21) is inscribed can be suppressed. Therefore, the heat retention capacity of the hot water storage tank 2 increases, and the energy required for re-boiling can be reduced. That is, the energy saving performance of the hot water storage type hot water supply apparatus can be improved.

As described above, in the first to fourth embodiments, the hot water storage type hot water supply apparatus using the heat pump unit 3 as the heating apparatus has been described. However, the heating device is not limited to the heat pump unit 3, and for example, a gas heater or an electric heater may be used.
Moreover, although the carbon dioxide which is a natural refrigerant | coolant was used for the heat pump unit 3 as a refrigerant | coolant, you may use other natural refrigerant | coolants, such as a hydrocarbon, for example. A fluorocarbon refrigerant such as R410A may be used for the heat pump unit 3. In this case, the refrigerant-water heat exchanger 12 functions as a condenser.

It is a schematic block diagram which shows the hot water storage type hot water supply apparatus which concerns on Embodiment 1 of this invention. It is AA sectional drawing of the hot water storage tank shown in FIG. It is operation | movement explanatory drawing (before heat pump unit stabilization) when the hot water storage type hot-water supply apparatus which concerns on Embodiment 1 of this invention performs only a boiling operation. It is operation | movement explanatory drawing (after heat pump unit stabilization) when the hot water storage type hot-water supply apparatus which concerns on Embodiment 1 of this invention performs only a boiling operation. It is operation | movement explanatory drawing when the hot water storage type hot-water supply apparatus which concerns on Embodiment 1 of this invention performs only hot-water supply driving | operation. It is operation | movement explanatory drawing when the hot water storage type hot-water supply apparatus which concerns on Embodiment 1 of this invention performs only heating operation. It is operation | movement explanatory drawing (before heat pump unit stabilization) when the hot water storage type hot water supply apparatus which concerns on Embodiment 1 of this invention performs a boiling operation and a hot water supply operation simultaneously. It is operation | movement explanatory drawing (after heat pump unit stabilization) when the hot water storage type hot-water supply apparatus which concerns on Embodiment 1 of this invention performs boiling operation and hot-water supply operation simultaneously. It is operation | movement explanatory drawing when the hot water storage type hot water supply apparatus which concerns on Embodiment 1 of this invention performs hot water supply operation and heating operation simultaneously. It is operation | movement explanatory drawing when performing the heating operation and boiling operation of the hot water storage type hot water supply apparatus by Embodiment 1 of this invention simultaneously. It is operation | movement explanatory drawing when the hot water storage type hot-water supply apparatus which concerns on Embodiment 1 of this invention performs all of boiling operation, hot-water supply operation, and heating operation simultaneously. It is a schematic block diagram which shows another example of the hot water storage type hot water supply apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the modification of the hot water storage type hot-water supply apparatus by Embodiment 1 of this invention. It is a schematic block diagram which shows the hot water storage type hot water supply apparatus which concerns on Embodiment 2 of this invention. It is BB sectional drawing of the hot water storage tank shown in FIG. It is a cross-sectional view which shows another example of the hot water storage tank which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional view which shows the hot water storage tank which concerns on Embodiment 3 of this invention. It is a longitudinal cross-sectional view which shows another example of the hot water storage tank which concerns on this Embodiment 3. FIG. It is a longitudinal cross-sectional view which shows another example of the hot water storage tank which concerns on this Embodiment 3. FIG. It is a cross-sectional view of the hot water storage tank and casing which concern on Embodiment 4 of this invention. It is a cross-sectional view which shows another example of the hot water storage tank and casing which concern on Embodiment 4 of this invention. It is a cross-sectional view which shows another example of the hot water storage tank and casing which concern on Embodiment 4 of this invention. It is a longitudinal cross-sectional view which shows another example of the hot water storage tank which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows another example of the hot water storage tank which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional view which shows another example of the hot water storage tank which concerns on Embodiment 3 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Hot water storage tank unit, 2 Hot water storage tank, 3 Heat pump unit (heating apparatus), 4 Hot water tap, 5 Setting panel, 6 Heating terminal, 7 Hot water supply piping, 8 Water supply piping, 9 Low temperature water extraction piping, 10 Boiling return piping, 11 Compressor, 12 Refrigerant-water heat exchanger, 13 Electronic expansion valve, 14 Forced air-cooled evaporator, 15 Heat pump refrigerant circuit, 16 Heat pump circulation pump, 17 Heat pump control circuit, 18 Heat exchanger, 19 High temperature water extraction pipe, 20 Middle hot water lower piping, 21 Wall surface communication section, 22 Heating circulation pump, 23 Heating temperature sensor, 24 Heating circuit, 25 Bottom communication section, 26 Heating terminal circulation pump, 27 Medium warm water upper piping, 28 Medium warm water mixing valve 29 Hot water mixing valve, 30 Hot water mixing valve, 31 Hot water supply water pipe, 32 Hot water mixing valve downstream piping, 33 Hot water temperature sensor, 34 (34a-34e) Hot water temperature sensor for high temperature water, 35 Hot water storage section, 36 Medium hot water storage section, 37 Water supply temperature sensor, 38 Partition section, 38a Cylindrical section, 38b Projection edge, 38c Bending section, 38d Reduced diameter part, 39 (39a to 39e) Hot water temperature sensor for medium temperature water, 40 Heating temperature sensor, 44 Boiling connection piping, 45 Hot water, 46 Medium temperature water, 47 Cold water, 48 Medium temperature water mixing valve downstream piping, 49 Heating hot water return pipe, 50 Heating hot water return valve, 51 Boiling return switching valve, 52 Boiling hot water return pipe, 53 Insulation, 100 casing.

Claims (16)

A hot water storage tank whose interior is divided into a first hot water storage section and a second hot water storage section communicating with each other at the bottom;
One end is connected to the hot water tank by piping, and a heating device for heating the hot water flowing from the hot water tank;
Each connection port is connected to each of the other end of the heating device, the first hot water storage unit, and the second hot water storage unit, and hot water heated by the heating device is connected to the first hot water storage unit or the A switching valve that can be switched to flow into the second hot water storage section;
A hot water storage type hot water supply apparatus characterized by comprising: A hot water storage tank whose interior is divided into a first hot water storage section and a second hot water storage section communicating with each other at the bottom;
Heat exchange in which one end is connected to the first hot water storage section by piping and the other end is connected to the second hot water storage section to exchange heat between the hot water flowing from the hot water storage tank and the fluid to be heated. A hot water storage type hot water supply apparatus, wherein hot water flowing out of the heat exchanger flows into the first hot water storage section. A hot water storage tank whose interior is divided into a first hot water storage section and a second hot water storage section communicating with each other at the bottom;
One end is connected to the hot water tank by piping, and a heating device for heating the hot water flowing from the hot water tank;
Each connection port is connected to each of the other end of the heating device, the first hot water storage unit, and the second hot water storage unit, and hot water heated by the heating device is connected to the first hot water storage unit or the A switching valve that can be switched to flow into the second hot water storage section;
Heat exchange in which one end is connected to the first hot water storage section by piping and the other end is connected to the second hot water storage section to exchange heat between the hot water flowing from the hot water storage tank and the fluid to be heated. A hot water storage type hot water supply apparatus, wherein hot water flowing out of the heat exchanger flows into the first hot water storage section. Until the predetermined condition is satisfied after the heating device is activated,
The switching valve is
The hot water storage type hot water supply apparatus according to claim 1 or 3, wherein hot water heated by the heating device is switched to flow into the first hot water storage section.   A pipe is connected to the first hot water storage section and the second hot water storage section, and hot water flowing from the first hot water storage section and hot water flowing from the second hot water storage section are mixed at a predetermined ratio and mixed. The hot water storage type hot water supply apparatus according to any one of claims 1 to 4, further comprising a mixing valve for allowing the hot water to flow out to the hot water tap. The mixing valve is
The hot water storage type hot water supply apparatus according to claim 5, wherein the hot water from the first hot water storage section is preferentially discharged so that the hot water flowing out of the mixing valve is equal to or higher than a required hot water supply temperature. The first hot water storage section is
The hot water storage type hot water supply apparatus according to claim 5 or 6, wherein a lower cross-sectional area is larger than an upper cross-sectional area.   The first temperature sensor for detecting the temperature of the hot water stored in the first hot water storage section, and the second temperature sensor for detecting the temperature of the hot water stored in the second hot water storage section, respectively, The hot water storage type hot water supply apparatus according to any one of claims 5 to 7, wherein the hot water storage tank is arranged in a vertical direction of the hot water storage tank.   The hot water storage type hot water supply apparatus according to any one of claims 1 to 8, wherein the first hot water storage part is formed along at least a part of a side surface part of the hot water storage tank.   The hot water storage system according to any one of claims 1 to 9, wherein the partition part that divides the first hot water storage part and the second hot water storage part has a high heat insulating performance. Hot water supply device. The partition is
A structure in which a plurality of plate members are stacked,
A structure in which a plurality of plate members are stacked and disposed via a gap, and an air heat insulating layer is formed between the plate members,
And a structure composed of a material with low thermal conductivity,
The hot water storage type hot water supply apparatus according to claim 10, which has at least one structure. The switching valve is switched so that hot water heated by the heating device flows into the first hot water storage section, and the mixing valve is configured so that hot water flowing out of the first hot water storage section flows out of the mixing valve. In the adjusted state,
At least a part of the hot water heated by the heating device flows out of the mixing valve without flowing into the first hot water storage section. The hot water storage type hot water supply apparatus described. The mixing valve is adjusted so that hot water flowing out from the second hot water storage section exchanges heat with the fluid to be heated in the heat exchanger, and hot water flowing out from the first hot water storage section flows out from the mixing valve. In the state that
The at least part of the hot water exchanged by the heat exchanger flows out of the mixing valve without flowing into the first hot water storage section. The hot water storage type hot water supply apparatus described in 1.   The hot water storage type hot water supply apparatus according to claim 9, wherein the partition part that divides the first hot water storage part and the second hot water storage part has a cylindrical shape. The hot water storage tank is stored in a housing,
The distance between the side surface portion of the hot water storage tank in contact with the first hot water storage portion and the side surface portion of the housing is such that the side surface portion of the hot water storage tank in contact with the second hot water storage portion and the side surface of the housing. The hot water storage type hot water supply device according to any one of claims 1 to 14, wherein the hot water storage device is smaller than a distance to the portion.   The hot water storage type hot water supply apparatus according to any one of claims 1, 3 and 4, wherein the heating device is a heat pump unit using carbon dioxide as a refrigerant.

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