JP3129210B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply apparatus having a hot water storage tank and a temperature control means for controlling the temperature of hot water in the hot water storage tank.

[0002]

2. Description of the Related Art An uncomfortable indoor environment in a hot and humid summer can be made comfortable by cooling and dehumidifying using an air conditioner. For this reason, air conditioners have become remarkably popular, but on the other hand, cooling operations are concentrated during the daytime in the middle of summer, leading to a peak in power demand, which may cause a problem in large factories where power supply is limited. is there. In such a case, if cold energy can be stored by using inexpensive electricity at night and used to reduce the cooling load of the air conditioner during the day, it would be economical as well as alleviate the peak of power demand. Will be helpful.

[0003] In order to solve the above problem from such a viewpoint, there is a hot water supply apparatus described in Japanese Patent Application Laid-Open No. 6-159845. However, in this hot water supply device, it is necessary to separately provide a cold storage tank and a hot water storage tank, which complicates a water system such as a branch circuit and increases the number of parts such as a three-way valve. there were.
Therefore, cold storage operation with a simple configuration using a single hot water storage tank,
A hot water supply device capable of hot water supply operation or cooling operation has been proposed by the present applicant (Japanese Patent Application Laid-Open No. 7-30806).
4).

FIG. 5 is a diagram showing a water system circuit of a water heater according to this proposal. In the figure, reference numeral 71 denotes a hot water storage tank. A hot water inlet 73 is provided at an intermediate portion of the hot water storage tank 71, and a cold water inlet 74 is provided at a position below the hot water inlet 73. Further, a hot water inlet 75 is provided at an intermediate position between the hot water inlet 73 and the cold water inlet 74, and a water inlet 76 is provided at a lower end of the hot water storage tank 71. On the other hand, reference numeral 77 denotes a double-pipe water heat exchanger functioning switchably as a condenser or an evaporator in the refrigerant circuit in the heat pump system having the refrigerant circuit, and is provided in the refrigerant circulation path 96. ing.
The heat exchange path 78 is exchangeable with the water heat exchanger 77.
Is provided, and hot and cold water flows from the inlet side 80 to the outlet side 81 by the operation of the circulation pump 79 interposed therebetween. The outlet side 8 of the heat exchange path 78
1 is branched into a hot water inflow pipe 83 and a cold water inflow pipe 84 via a first three-way valve 82,
Are connected, and a cold water inflow pipe 84 is connected to the cold water inlet 74. On the other hand, the inlet side 80 of the heat exchange path 78
Is branched into a water intake pipe 86 and a water intake pipe 87 via the circulation pump 79 and the second three-way valve 85, and the water intake pipe 75 is connected to a water intake port 75.
6 is connected, and an intake pipe 87 is connected to the intake port 76. In the same figure, reference numeral 88 denotes a water supply pipe for supplying city water to the hot water storage tank 71 while applying water supply pressure, and the hot water storage tank 71 side is connected to a first water supply pipe 90 and a second water supply pipe 91 via a third three-way valve 89. It has branched. At the intermediate position between the hot water inlet 75 and the cold water inlet 74, the first water supply pipe 90 is connected to the first water supply port 92 provided in the hot water storage tank 71, and provided at the lower end of the hot water storage tank 71. The second water supply pipe 91 is connected to the second water supply port 93. Further, a hot water supply port 94 is provided at an upper end portion of the hot water storage tank 71, and a hot water supply pipe 95 is connected to the hot water supply port 94. In the figure, reference numeral 72 denotes an electric heater operated by midnight power.

Next, the operation of the above-described conventional hot water supply apparatus will be described. First, the hot water supply heating operation causes the water heat exchanger 77 to function as a condenser in the refrigerant circuit, while the first three-way valve 82 is on the solid line side, and the second three-way valve 85 and the third three-way valve 89 are on the broken line side. Switch to each circulation pump 79
Activate Then, the stored water flows out of a hot water inlet 75 provided at an intermediate portion of the hot water storage tank 71, and this flows into a hot water pipe 86.
Flows through the heat exchange path 78 via the. At this time, heat exchange path 7
The stored water flowing through 8 is heated by a water heat exchanger 77 functioning as a condenser to become hot water, and is returned into the hot water storage tank 71 from the hot water inlet 73 through the hot water inflow pipe 83. By continuing such an operation, hot water is stored at the upper end side of the hot water storage tank 71. At this time, water was supplied into the hot water storage tank 71 through the first water supply pipe 90 through a first water supply port 92 provided in the hot water storage tank 71, thereby providing water at the upper end of the hot water storage tank 71. Hot water is supplied from the hot water supply port 94.

On the other hand, in the cold storage operation, the water heat exchanger 77 functions as an evaporator in the refrigerant circuit, the first three-way valve 82 and the third three-way valve 89 are on the broken line side, and the second three-way valve 85 is on the solid line. Side, and the circulation pump 79 is operated. Then, the stored water flows out of a water intake 76 provided at the lower end of the hot water storage tank 71, and flows through the heat exchange path 78 via a water intake pipe 87. At this time, the stored water flowing through the heat exchange path 78 is cooled by the water heat exchanger 77 functioning as an evaporator to become cold water, and the cold water inflow pipe 84
Is returned from the cold water inlet 74 into the hot water storage tank 71. By continuing such an operation, cold water is stored at the lower end of the hot water storage tank 71.

In the hot water supply apparatus described above, hot water is stored in the hot water storage tank 71 at the upper end side near the hot water inlet 73 and cold water is stored at the lower end side near the cold water inlet 74. A city water layer is formed between the water and the cold water. By providing such an intermediate layer of city water in the hot water storage tank 71, it is possible to avoid direct heat transfer between hot and cold water, and to stably store both of them for a long time. Could be done.

[0008]

In the above hot water supply apparatus, hot water heated by the water heat exchanger 77 during hot water supply operation flows into the hot water storage tank 71 from the hot water inlet 73 through the hot water inflow pipe 83. At this time, the temperature of the hot water flowing from the hot water inflow port 73 is higher than that of the city water in the hot water storage tank 71, and thus the temperature tends to go upward due to the temperature difference. However, since the inflow is performed with the water pressure applied by the circulation pump 79, the hot water is dispersed in multiple directions due to collision with stored water or the like, and the hot water is stored in the hot water storage tank 71.
Will flow in. Therefore, the inflowing hot water mixes with the city water stored slightly below the vicinity of the hot water inflow port 73, or the boundary between the city water and the hot water is agitated, thereby promoting heat transfer between the two or inflowing. The hot water flows out of the hot water inlet 75 located below the hot water inlet 73 again, and is heated again by the water heat exchanger 77, for example. As a result, there is a problem that energy loss occurs during the hot water supply operation, and the running cost increases.

In the cold storage operation, the water heat exchanger 7
The cold water cooled in 7 flows into the hot water storage tank 71 from the cold water inlet 74 via the cold water inflow pipe 81. Although the chilled water flowing in at this time tends to move downward due to the temperature difference, the chilled water flowing in the vicinity of the chilled water inlet 74 is dispersed in multiple directions and the chilled water
Mixing with the city water stored slightly above the vicinity, or agitation of the interface between the cold water and the city water may promote heat transfer between the two. There was a problem that loss occurred.

Further, hot water supply port 9 at the upper end of hot water storage tank 71 is provided.
When city water is supplied from the first water supply port 93 while applying water supply pressure in order to make hot water from the third water supply, the city water also flows in multiple directions from the first water supply port 93 in the same manner as described above. Therefore, the boundary surface between the city water and the cold water is agitated in the hot water storage tank 71, thereby promoting the heat transfer between the cold water and the city water, and the cold water stored at the lower end side of the hot water storage tank 71. This causes a problem that the temperature rises and the cold storage efficiency decreases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional disadvantages, and an object of the present invention is to provide a hot water supply apparatus for storing hot and cold water having different temperatures in a hot water storage tank in a layered manner.
An object of the present invention is to improve energy efficiency during a hot water supply operation or a cold storage operation, thereby reducing running costs.

[0012]

Therefore, the hot water supply apparatus of the present invention includes a hot water storage tank 1 and a temperature control means 16 for controlling the temperature of hot water in the hot water storage tank 1. In the hot water supply apparatus having an inflow port for hot water supplied at an intermediate portion of the hot water storage tank 1 and storing hot water having different temperatures in the hot water storage tank 1 in a layered manner, The hot water inflow port 3 through which the hot water heated by the hot water 16 flows in is provided with a first flow path deflecting member 27 for giving an upward flow component to the hot water flowing in.

In the hot water supply apparatus of the first aspect, the temperature control means 1
The hot water heated by 6 flows into hot water storage tank 1 from hot water inflow port 3. At this time, the hot water is given a flow component toward the upper end of the hot water storage tank 1 in which hot water is stored by the first flow path deflecting member 27 provided at the hot water inflow port 3. Therefore, it is possible to reduce mixing with the low-temperature side hot water stored in the lower end side of the hot water storage tank 1.

In the hot water supply apparatus of the present invention, the second flow path for providing a downward flow component to the inflowing cold water is provided to the cold water inflow port 4 into which the hot water cooled by the temperature control means 16 flows. It is characterized in that a deflection member 28 is provided.

In the water heater according to the second aspect, the temperature control means 1
The hot and cold water cooled by 6 flows into the hot water storage tank 1 from the cold water inlet 4. At this time, the hot water is given a flow component toward the lower end side of the hot water storage tank 1 in which the cold water is stored by the second flow path deflecting member 28 provided at the cold water inlet 4. Therefore, it is possible to reduce mixing with hot water stored on the upper end side of the hot water storage tank 1.

Further, in the hot water supply apparatus of the third aspect, the hot water storage tank 1 has a hot water supply port 25 at an upper end thereof for discharging hot water and a city water inlet 19 through which city water to be supplied flows. On the other hand, the hot water inlet 3 is provided on the upper end side of the city water inlet 19, and the cold water inlet 4 is provided on the lower end side of the city water inlet 19. A third flow path deflecting member 29 for providing an upward flow component to incoming city water is provided.

In the hot water supply apparatus of the third aspect, the city water flowing from the city water inlet 19 is supplied to the hot water storage tank 1 for storing the hot water to be discharged by the third flow path deflecting member 29 provided at the city water inlet 19. The flow component toward the upper end side is given. Therefore, it is possible to reduce mixing with the low-temperature side hot water stored in the lower end side of the hot water storage tank 1.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the hot water supply apparatus of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram showing a water system and a refrigerant system in the water heater. In FIG. 1, reference numeral 1 denotes a hot water storage tank containing an electric heater 2. A hot water inlet 3 is provided at an intermediate portion of the hot water storage tank 1, and a cold water inlet 4 is provided at a position lower than the hot water inlet 3. Is provided. A hot water inlet 5 is provided at an intermediate portion between the hot water inlet 3 and the cold water inlet 4, and a water inlet 6 is provided at a lower end of the hot water storage tank 1. On the other hand, in the heat pump system 16 functioning as a temperature control means for heating or cooling the hot water in the hot water storage tank 1, reference numeral 7 denotes a double-pipe water heat exchange functioning as a switchable condenser or evaporator in the refrigerant circuit. It is a vessel. A heat exchange path 8 is provided so as to be able to exchange heat with the water heat exchanger 7, and a circulation pump 9
The hot water flows from the inlet side 10 to the outlet side 11 by the operation. The outlet side 11 of the heat exchange path 8 branches into a hot water inflow pipe 13 and a cold water inflow pipe 14 via a first three-way valve 12.
Is connected to the hot water inlet 3 of the hot water storage tank 1, and the cold water inflow pipe 14 is connected to the cold water inlet 4 of the hot water storage tank 1. Further, the inlet side 10 of the heat exchange path 8 is provided with a second three-way valve 15.
The hot water pipe 17 is connected to the hot water inlet 5 of the hot water storage tank 1, and the hot water pipe 18 is connected to the water inlet 6 of the hot water storage tank 1. I have.

In FIG. 1, reference numeral 21 denotes a water supply pipe for supplying city water to the hot water storage tank 1 while applying water supply pressure. This hot water supply pipe 21 has a third three-way valve 22
A first water supply port (city water inlet) 19 which is branched into a first water supply pipe 23 and a second water supply pipe 24 via a water supply port, and is provided at an intermediate position between the hot water inlet 5 and the cold water inlet 4 of the hot water storage tank 1. The first water supply pipe 23 is connected to the water supply tank 1, and the second water supply pipe 2 is connected to a second water supply port 20 provided at the lower end of the hot water storage tank 1.
4 are connected. Also, at the upper end of the hot water storage tank 1,
A hot water supply port 25 is provided, and a hot water supply pipe 26 is connected to the hot water supply port 25. The hot water inlet 3, the cold water inlet 4, and the first water supply port 19 provided in the hot water storage tank 1 have first baffles (first flow path deflecting members) 27, respectively.
A second baffle (second flow path deflection member) 28 and a third baffle (third flow path deflection member) 29 are provided inside the hot water storage tank 1. The first to third baffles 27, 2
The shapes and functions of 8, 29 will be described later.

Further, the above-mentioned water system circuit is controlled by a control means 36. This control means 36 is constituted by using a microcomputer having a CPU, a memory, an input / output interface and the like. A first temperature sensor 37 for detecting the temperature of hot water returned from the heat exchange path 8 to the hot water storage tank 1 is provided at the outlet side 11 of the heat exchange path 8.
On the other hand, the first water supply pipe 23 is provided with a second temperature sensor 38 for detecting the temperature of city water supplied to the hot water storage tank 1. Then, the water temperature Tm and the city water temperature Ts detected by the first temperature sensor 37 and the second temperature sensor 38
Is input to the control means 36.

On the other hand, the refrigerant system in the heat pump system 16 includes a compressor 39, a four-way switching valve 40, an outdoor heat exchanger 41, a first expansion valve 42, and indoor expansion valves 43 and 44, respectively, as shown in FIG. The indoor heat exchangers 45 and 46 provided and connected in parallel with each other are sequentially connected by pipes 47 to 52. Also, the discharge line 47 of the compressor 39
A first solenoid valve 53 is interposed between the second solenoid valve 5 and the second solenoid valve 5.
The first heat pipe 55 having the first pipe 55 is connected to one end of the water heat exchanger 7.
Is connected to a pipe 50 toward the first expansion valve 42 by a second pipe 57 provided with a second expansion valve 56 interposed therebetween. The first conduit 55 on the water heat exchanger 7 side of the second solenoid valve 54
Is connected to a suction pipe 52 of the compressor 39 by a third pipe 59 provided with a third solenoid valve 58, while an accumulator 60 is provided in the suction pipe 52. This refrigerant system circuit is also controlled by the control means 36 as in the case of the water system.

FIG. 2 shows a hot water storage tank 1. FIG. 1A is a plan view of the hot water storage tank 1, and FIG. 1B is a front view. The hot water storage tank 1 has a substantially cylindrical shape extending vertically, and is supported at its lower end by a base 1a.
A first water supply port 19 and a cold water inlet 4 are provided. Inside the hot water storage tank 1, a first baffle 27 is provided at the hot water inlet 3, and when hot water flows into the hot water storage tank 1 from the hot water inlet 3, the first baffle 2
7 allows the incoming hot water to be given an upward flow component. Further, a second baffle 28 is provided at the cold water inlet 4, and the second baffle 28 gives a downward flow component to the cold water flowing into the hot water storage tank 1 from the cold water inlet 4. First
A third baffle 29 is also provided at the water supply port 19, and the third baffle 29 gives an upward flow component to city water flowing into the hot water storage tank 1 from the first water supply port 19.

FIG. 3 shows the shape of the first baffle 27. FIG. 7A is a rear view of the first baffle 27,
(B) is a plan view, and (c) is a left side view. An end plate 31 is provided on one of the short sides of the trapezoidal bottom plate 30, and the end plate 31 and the bottom plate 30 are smoothly connected by an arcuate curved portion 31a. Side plates 32, 32 are provided on the opposed longitudinal sides of the bottom plate 30, respectively. Flanges 33, 33 are provided at the ends of the side plates 32, 32 opposite to the end plate 31, facing outward.
An inflow opening 34 is formed by the edges of the bottom plate 30 and the side plates 32, 32 on the side opposite to the end plate, and an outflow opening 35 is formed by the edges of the end plate 31 and the side plates 32, 32 on the side of the opposite bottom plate.
Are formed. In addition, the third baffle 29 is
It has the same shape as the baffle 27, but the second baffle 28
In FIG. 3, the dimension indicated by A in FIG. 3 is shorter than the first baffle 27, and accordingly, the dimension indicated by B is longer than the first baffle 27.

Next, a vertical section AA passing through the hot water inlet 5 and the first water supply port 19 of the hot water storage tank 1 and a vertical section B- passing through the hot water inlet 3 and the cold water inlet 4 shown in FIG. B are shown in FIGS. 4A and 4B, respectively. FIG. 4 (a),
As shown in (b), the first baffle 27 has its inflow opening 34 facing the hot water inflow port 3, and further has its outflow opening 3.
5 is provided so as to face the upper end side of the hot water storage tank 1. The third baffle 29 also has its inflow opening 34b facing the first water supply port 19, like the first baffle 27.
The outflow opening 35b is provided so as to face the upper end side of the hot water storage tank 1. On the other hand, the second baffle 28 is provided such that the inflow opening 34a faces the cold water inlet 4 and the outflow opening 35a faces the lower end side of the hot water storage tank 1.

Next, the operation of the hot water supply apparatus having the above configuration will be described. First, when performing the cold storage operation, the control means 3
6 performs the following control on the refrigerant system circuit. FIG.
, The four-way switching valve 40 is switched to the passage side indicated by the broken line to open the first solenoid valve 53, the third solenoid valve 58, and the first expansion valve 42, while the second solenoid valve 54 and each indoor expansion valve are opened. 4
3 and 44 are closed. When the compressor 39 is driven, the outdoor heat exchanger 53 functions as a condenser and the water heat exchanger 7 functions as an evaporator. On the other hand, for the water system circuit, the circulating pump 9 is operated by switching the first three-way valve 12 and the third three-way valve 22 to the passage shown by the broken line, and switching the second three-way valve 15 to the passage shown by the solid line. Then, the stored water in the hot water storage tank 1 flows out of the water intake port 6 at the lower end of the hot water storage tank 1, and is passed through the water intake pipe 18.
Sent to. Here, the stored water is cooled by a water heat exchanger 7 functioning as an evaporator,
Through the cold water inlet 4 into the hot water storage tank 1. At this time, the second baffle 28 is provided at the cold water inlet 4, and the cold water flowing from the cold water inlet 4 through the inflow opening 34 a of the second baffle 28 flows out of the downwardly directed outflow opening 35 a. By continuing this operation, the cold water inlet 4 in the hot water storage tank 1 is opened.
Cold water is stored at the lower end side.

Next, a description will be given of a cooling operation using cold water, which is performed by using the cold water stored by the cold storage operation. FIG.
, The control means 36 performs the following control on the refrigerant system circuit. First, the four-way switching valve 40 is switched to the passage side indicated by a broken line to close the first solenoid valve 53, the third solenoid valve 58, and the first expansion valve 42, while closing the second solenoid valve 54 and each indoor expansion valve. Valves 43 and 44 are opened. When the compressor 1 is driven, the outdoor heat exchanger 41 does not operate, the water heat exchanger 7 functions as a condenser, and the indoor heat exchangers 45 and 46 function as evaporators. On the other hand, for the water system circuit, the second three-way valve 15 is switched to the passage side indicated by a solid line, and the third three-way valve 22 is switched to the passage side indicated by a broken line. Further, regarding the first three-way valve, the water temperature Tm of the return flow from the water heat exchanger 7 detected by the first temperature sensor 37 provided on the outlet side 11 of the water heat exchanger 7 and the first water supply pipe 23 Control is performed by comparing the temperature with the city water temperature Ts detected by the second temperature sensor 38 provided. That is, if the water temperature Tm of the return flow from the water heat exchanger 7 is lower than the city water temperature Ts, the first three-way valve 1
2 is switched to the passage side indicated by a broken line, and if the water temperature Tm of the return flow from the water heat exchanger 7 is higher than the city water temperature Ts, the first
The three-way valve 12 is switched to the passage side indicated by a solid line. When the circulation pump 9 is operated in the above state,
The water stored in the hot water storage tank 1 flows out of the water intake 6 at the lower end of the hot water storage tank 1 and is sent to the water heat exchanger 7 through the water intake pipe 18. At this time, the stored water is allowed to cool in the water heat exchanger 7 functioning as a condenser in the refrigerant system circuit, and flows out from the outlet side 11 of the water heat exchanger 7. Here, the temperature of the stored water Tm rises due to cooling in the water heat exchanger 7. If the water temperature Tm is still lower than the city water temperature Ts, the water is returned from the cold water inlet 4 to the hot water storage tank 1 through the cold water inflow pipe 14, while
If the water temperature Tm is higher than the city water temperature Ts, the water is returned from the hot water inlet 3 to the hot water storage tank 1 through the hot water inflow pipe 13.

At this time, when the hot water returned from the water heat exchanger 7 flows into the hot water storage tank from the hot water inlet 3 through the hot water inflow pipe 13, the hot water flows from the hot water inlet 3 to the first baffle 27. Through the inflow opening 34 and out through the outflow opening 35 facing upward. On the other hand, when the hot water returned from the water heat exchanger 7 flows into the hot water storage tank 1 from the cold water inlet 4 through the cold water inlet pipe 14, the hot water flows into the second baffle 28 from the cold water inlet 4. Opening 3
It flows in through 4a and flows out through a downwardly directed outflow opening 35a.

Further, a hot water supply heating operation for heating the hot water in the hot water storage tank 1 will be described. In FIG. 1, the control means 36 performs the following control on the refrigerant system circuit. The four-way switching valve 40 is switched to the passage side shown by the broken line, and the first solenoid valve 53 and the third solenoid valve 58 are closed, while the second solenoid valve 53 is closed.
Solenoid valve 54, second expansion valve 56, and indoor expansion valves 43, 44
Is opened. When the compressor 39 is driven, the water heat exchanger 7 functions as a condenser, and the indoor heat exchangers 45 and 46 function as evaporators, which is a cooling hot water supply operation. On the other hand, the four-way switching valve 40 is switched to the passage side shown by the solid line to close the first solenoid valve 53 and the third solenoid valve 58, while the second solenoid valve 54, the second expansion valve 56, and the first expansion valve 42 Is opened.
Then, when the compressor 39 is driven, the water heat exchanger 7 functions as a condenser, and the outdoor heat exchanger 41 functions as an evaporator. On the other hand, for the water system circuit, the first three-way valve 12 is switched to the passage side shown by a solid line, and the second three-way valve 15 and the third three-way valve 22 are switched to the passage side shown by a broken line to operate the circulation pump 9. Let it. Then, the stored water flows out of the hot water inlet 5 in the middle part of the hot water storage tank 1 and is sent to the water heat exchanger 7 through the hot water pipe 17. At this time, since the water heat exchanger 7 functions as a condenser, the stored water is heated by the water heat exchanger 7. The heated storage water is returned from the hot water inflow port 3 into the hot water storage tank 1 through the hot water inflow pipe 13, and the hot water is stored inside the hot water storage tank 1 at an upper end side of the hot water inflow port 3.
When cold water is stored at the lower end of the hot water storage tank 1, hot water is supplied from the hot water supply port 25 by supplying water while applying water supply pressure from the first water supply port 19 through the first water supply pipe 23. can do.

In this hot water supply heating operation, the hot water returned from the water heat exchanger 7 enters the hot water storage tank 1 from the hot water inflow port 3 through the hot water inflow pipe 13 as in the case of the above-described cooling operation using cold water. Will be returned. At this time, the first baffle 27 is provided at the hot water inlet 3, and the hot water flowing from the hot water inlet 3 through the inflow opening 34 of the first baffle 27 flows out of the upwardly-facing outflow opening 35. Has become. By continuing this operation, hot water is stored in the hot water storage tank 1 at the upper end side of the hot water inlet 3. In addition, the hot water storage tank 1
When city water is supplied, the third baffle 29 is provided at the first water supply port 19, so that the hot water flowing from the first water supply port 19 through the inflow opening 34b of the third baffle 29 flows upward. It flows out from the outflow opening 35b facing to the side.

The hot water supply apparatus of the present invention is different from the conventional one in that the hot water inlet 3, the cold water inlet 4, and the first water inlet 19 are different.
Are provided with a first baffle 27, a second baffle 28, and a third baffle 29, respectively. During the hot water supply heating operation, the hot water heated by the water heat exchanger 7 flows into the hot water storage tank 1 from the hot water inlet 3. At this time, the hot water is deflected by the first baffle 27 provided at the hot water inflow port 3 toward the upper end of the hot water storage tank 1, that is, toward the hot water to be stored. Therefore, the city water stored at the lower end side of the hot water inlet 3 and the incoming hot water are mixed,
Stirring of the interface between city water and hot water by the flowing hot water is avoided. Further, the short circuit state in which the inflowing hot water flows out of the hot water inlet 5 again and is heated again by the water heat exchanger 7 is also avoided. Therefore, it is possible to suppress the waste of energy during the hot water supply operation and reduce the running cost. If you want to avoid this short circuit state more reliably,
What is necessary is just to provide a downward baffle (not shown) in the hot water inlet 5.

In the cold storage operation, the water heat exchanger 7
The hot water cooled by the hot water flows into the hot water storage tank 1 from the cold water inlet 4. At this time, the cold water is deflected by the second baffle 28 provided at the cold water inlet 4 toward the lower end of the hot water storage tank 1, that is, the cold water to be stored. Therefore, in this case as well, it is avoided that the city water stored on the upper end side of the cold water inlet 4 and the inflowing cold water are mixed or that the inflowing cold water agitates the boundary surface between the city water and the cold water. You. Therefore, the cold storage efficiency can be improved.

Further, the hot water storage tank 1 is operated by the hot water supply heating operation.
The hot water stored at the upper end of the hot water is supplied from the first water supply port 19 via the first water supply pipe 23 while applying water supply pressure, so that the hot water is discharged from the hot water supply port 25. At this time, the first
The city water flowing in from the water supply port 19 is deflected by a third baffle 29 provided in the first water supply port 19 to the upper end side of the hot water storage tank 1, that is, the side where hot water to be discharged is stored. Therefore, it is avoided that the cold water and the city water stored at the lower end side of the first water supply port 19 are mixed or that the boundary surface is agitated by the flowing city water. Therefore, it is possible to avoid a rise in the temperature of the cold water to be stored, thereby improving the cold storage effect.

Since the agitation of the interface between the hot water and the city water or between the city water and the cold water is avoided as described above, the capacity of the city water layer can be sufficiently secured without decreasing. Therefore, heat exchange between hot and cold water can be reliably prevented. In the cooling operation using the cold water stored in the hot water storage tank 1, when the hot water returned from the water heat exchanger 7 is higher than the city water temperature Ts, the hot water is supplied through the hot water inflow pipe 13. While flowing into the hot water storage tank 1 from the inflow port 3,
When the hot water returned from the water heat exchanger 7 is lower than the city water temperature Ts, the hot water flows from the cold water inlet 4 through the cold water inlet pipe 14 into the hot water storage tank 1. Therefore, even when the temperature of the hot water returned from the water heat exchanger 7 is gradually increased by the cooling water utilization cooling operation, mixing of hot water, city water, and cold water is prevented, and a decrease in energy efficiency is avoided.

In the above description, the dimension A of the second baffle 28 shown in FIG. 3 is shorter than the first baffle 27. This is because the temperature change of the hot water during the cold storage operation is slightly smaller than that during the hot water supply heating operation, so that the flow path is further deflected downward to reliably prevent the mixing of the cooled water and the city water. That's why. Further, in the above description, each baffle 27, 28, 29 is provided with an arcuate curved portion 31a. With such a structure, the flow of hot water, city water, and cold water can be made smooth.

Although the specific embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, the shapes of the first to third baffles are not limited to those of the above-described embodiment, and one of the cylindrical members is attached to the inflow ports 3, 4, and 19, and the other is defined as a predetermined one. May be used, as long as the hot water flowing into the hot water storage tank 1 from the inflow ports 3, 4, 19 can be given a flow component in a predetermined direction. . In the above embodiment, the case where hot water is stored at the upper end side of the hot water storage tank 1 and cold water is stored at the lower end side, and the hot water supply heating operation and the cold storage operation are performed. In the case where hot water is stored at the upper end of the hot water storage tank 1 and city water is stored at the lower end and only hot water supply heating operation is performed, or city water is stored at the upper end of the hot water storage tank 1 and cold water is stored at the lower end. The present invention can be used even when only storage and cold storage operations are performed. Further, the water system circuit and the refrigerant system circuit shown in FIG. 1 are merely examples, and are not limited to those shown in the drawings. Further, in the above description, a heat pump system having a refrigerant circuit is used as the temperature control means, but various means such as an electric heater can be adopted as long as the temperature of hot water can be controlled.

[0036]

According to the first aspect of the present invention, mixing of hot water heated by the temperature control means and flowing into the hot water storage tank from the hot water inflow port into the hot water storage tank at the lower end of the hot water storage tank is performed. Therefore, it is possible to improve the hot water supply efficiency, suppress the waste of energy, and reduce the running cost during the hot water supply operation.

In the hot water supply apparatus of the second aspect, mixing of hot water cooled by the temperature control means and flowing into the hot water storage tank from the cold water inlet and hot water stored at the upper end of the hot water storage tank is reduced. Therefore, the cold storage efficiency can be improved.

Furthermore, in the hot water supply apparatus of the third aspect, mixing of city water flowing into the hot water storage tank from the city water inlet and cold water stored at the lower end side of the hot water storage tank is reduced, so that cold water is reduced. It is possible to improve the cold storage efficiency by suppressing the temperature rise.

[Brief description of the drawings]

FIG. 1 is a diagram showing a water system circuit and a refrigerant system circuit of one embodiment of a hot water supply device of the present invention.

FIG. 2 is a configuration diagram of a hot water storage tank of the hot water supply device;
(A) is a plan view and (b) is a front view.

3A and 3B are diagrams showing a shape of a first baffle, wherein FIG. 3A is a rear view, FIG. 3B is a plan view, and FIG. 3C is a left side view.

FIG. 4 (a) is a partial longitudinal sectional view passing through a first water supply port of the hot water storage tank, and FIG. 4 (b) is a partial longitudinal sectional view passing through a hot water inlet and a cold water inlet of the hot water storage tank.

FIG. 5 is a water circuit diagram of a conventional hot water supply apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water storage tank 3 Hot water inflow port 4 Cold water inflow port 16 Heat pump system (temperature control means) 19 1st water supply port (city water inflow port) 27 1st baffle (1st flow path deflection member) 28 2nd baffle (2nd flow path) (Deflection member) 29 Third baffle (third flow path deflection member)

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-49668 (JP, A) JP-A-6-159846 (JP, A) JP-A-58-205040 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) F24H 1/18 F28D 20/00

Claims (3)

(57) [Claims] 1. A hot water storage tank (1), and a temperature control means (16) for controlling the temperature of hot water in the hot water storage tank (1), and a flow of hot water whose temperature is controlled by the temperature control means (16). In the hot water supply apparatus having an inlet at an intermediate portion of the hot water storage tank and storing hot and cold water having different temperatures in the hot water storage tank (1) in a layered manner, the inlet is heated by a temperature control means. A hot water supply device, wherein a hot water inflow port (3) through which hot water flows is provided with a first flow path deflecting member (27) that gives an upward flow component to the hot water flowing in. 2. A chilled water inlet (4) through which hot and cold water cooled by the temperature control means flows into the chilled water inlet, a second flow path deflecting member (28) for giving a downward flow component to the incoming chilled water. The hot water supply device according to claim 1, wherein the hot water supply device is provided. 3. The hot water storage tank (1) is provided with a hot water supply port (25) at an upper end thereof for discharging hot water and a city water inlet (19) for flowing city water to be supplied at an intermediate portion thereof. On the other hand, the hot water inlet (3) is provided on the upper end side of the city water inlet (19), and the cold water inlet (4) is provided on the lower end side of the city water inlet (19). 3. The hot-water supply device according to claim 2, wherein the city water inlet (19) is provided with a third flow path deflecting member (29) for giving an upward flow component to the inflowing city water.