JP2009068761A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater capable of simultaneously performing a heating-up operation of a hot water storage tank, a reheating operation of a bathtub, and a heating operation by a heating unit by one tank circulation pump. <P>SOLUTION: This hot water storage type water heater comprises a heating-up circuit including a first three-way valve connected with a lower portion of the hot water storage tank at its first inflow port, the tank circulation pump connected with an outflow port of the first three-way valve at its suction port, a second three-way valve connected with a discharge port of the tank circulation pump at its inflow port, and a heat exchanger for heating-up connected with the first outflow port of the second three-way valve at its inflow port and connected with an upper portion of the hot water storage tank at its outflow port, a heat source circuit including a first three-way valve connected with an upper portion of the hot water storage tank at its second inflow port, a tank circulation pump connected with an outflow port of the first three-way valve at its suction port, and a second three-way valve connected with a discharge port of the tank circulation pump at its inflow port and connected with a lower portion of the hot water storage tank at its second outflow port, and an utilization-side heat exchanger connected in the heat source circuit in series. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, the hot water heated by the heat exchanger for boiling of the heat pump unit is returned to the upper part of the hot water storage tank and supplied to the lower part of the hot water storage tank so that a temperature difference occurs between the upper part and the lower part. The present invention relates to hot water and a hot water storage type water heater that stores water.

  Conventionally, in a heat pump hot water storage type water heater using a refrigeration cycle, a circuit that circulates the hot water in the hot water storage tank to the heat exchanger for boiling, and the hot water in the hot water storage tank are reheated in the bath water or heated by the heating unit. Some circuits circulate through the use side heat exchanger to be circulated by a single circulation pump.

  This hot water storage type water heater has a hot water storage tank for storing hot water, a heat exchanger for hot water supply for heating the hot water in the hot water storage tank, reheating in a bathtub using hot water in the hot water storage tank, and a heating unit. A water heater having a use side heat exchanger for heating, wherein one end is connected to the lower part of the hot water storage tank, the other end is connected to the upper part of the hot water storage tank, and the use side piping of the heat exchanger for hot water supply A hot water supply pipe, one end of which is connected to the upper part of the hot water storage tank, the other end of which is connected to the lower part of the hot water storage tank, and which constitutes the heat source side pipe of the use side heat exchanger, and the hot water supply A first control valve provided at a connection portion between one end of the pipe and the other end of the heat source side pipe; one end is connected to the other end of the hot water supply pipe via a second control valve; A lower return pipe connected to the lower part of the hot water storage tank, and the first control valve The hot water supply pipe between the second control valve and the second control valve is provided with a circulation pump, and in the boiling operation of the hot water supply tank, the water discharged from the lower part of the hot water storage tank by operating the circulation pump. Through the first control valve, the circulation pump, the hot water supply heat exchanger, and the second control valve, and return from the upper part of the hot water storage tank. The hot water radiated by the use side heat exchanger is passed through the first control valve, the circulation pump, the hot water heat exchanger, the second control valve, and the return pipe. To the hot water storage tank (see, for example, Patent Document 1).

JP 2004-218907 A

  However, according to the above-described conventional technique, when the circulation pump is operated during reheating of bath water or heating by a heating unit, the hot water after radiating heat from the use side heat exchanger is always heated. Return to hot water storage tank via heat exchanger for raising. Therefore, depending on the installation location of the hot water storage type hot water heater, there is a problem that the piping becomes very long and the heat dissipation loss of the return hot water becomes large. In addition, there is a problem that the hot water tank heating operation and the bath water reheating and the heating operation in the heating unit cannot be performed simultaneously.

  The present invention has been made in view of the above, and efficiently performs a heating operation of a hot water storage tank, a reheating operation of bath water, and a heating operation in a heating unit by a single tank circulation pump. An object of the present invention is to obtain a hot water storage type hot water heater that can perform a boiling operation of a hot water storage tank, a reheating operation of bathtub water, and a heating operation of a heating unit at the same time.

  In order to solve the above-described problems and achieve the object, the present invention provides a hot water storage tank for storing heated hot water and supplied water, and a first inflow port connected to a lower portion of the hot water storage tank. A three-way valve, a tank circulation pump having a suction port connected to an outlet of the first three-way valve, a second three-way valve having an inlet connected to a discharge port of the tank circulation pump, and the second A boiling heat exchanger including an inlet connected to a first outlet of the three-way valve and an outlet connected to an upper portion of the hot water storage tank; and a heating circuit including an upper portion of the hot water storage tank; The first three-way valve connected to the second inlet, the tank circulation pump connected to the outlet of the first three-way valve, and the inlet to the outlet of the tank circulation pump The second three-way valve connected and having a second outlet connected to the lower part of the hot water storage tank; A heat source circuit formed comprise, characterized in that it comprises a utilization side heat exchanger connected in series, the in heat source circuit.

  According to the present invention, the heating operation of the hot water storage tank, the reheating operation of the bathtub hot water, and the heating operation of the heating unit can be efficiently performed by one tank circulation pump. There is an effect that a hot water storage type water heater capable of simultaneously performing a boiling operation, a bath water reheating operation, and a heating operation in a heating unit can be obtained.

  Embodiments of a hot water storage type water heater according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a circuit diagram showing a first embodiment of a hot water storage type hot water heater according to the present invention, and FIG. 2 is a diagram showing a flow of hot water during a boiling operation of the hot water storage type water heater of the first embodiment. Yes, FIG. 3 is a diagram showing the flow of hot water during the bathtub reheating operation of the hot water storage hot water supply apparatus according to the first embodiment, and FIG. It is a figure which shows the flow of the warm water at the time of a boiling simultaneous operation. As shown in FIG. 1, a hot water storage type water heater 100 according to the first embodiment includes a hot water supply unit 1, a heat pump unit 60, and a bathtub 50.

  The hot water supply unit 1 stores heated hot water and water supplied from the water supply pipe 3 and supplies hot water to the outside via the hot water supply pipe 5 and hot water stored in the lower part of the hot water storage tank 10 to suck out the hot water. A tank circulation pump 11 that sends water to the unit 60 and returns the hot water heated by the heat pump unit 60 to the upper part of the hot water storage tank 10, and uses the hot water stored in the upper part of the hot water storage tank 10 for reheating the bathtub 50. Side heat exchanger 12.

  The heat pump unit 60 is formed by connecting a compressor 61, a heating heat exchanger 62, an expansion valve 63, and an evaporator 64 in a ring shape as a heat pump circuit 65, and constitutes a refrigeration cycle.

  The boiling heat exchanger 62 performs heat exchange between the heat pump circuit 65 constituting the refrigeration cycle and the boiling circuit 41 of the hot water supply unit 1. In order to boil hot water of the boiling circuit 41 into hot water, the refrigeration cycle is operated at a pressure exceeding the critical pressure using carbon dioxide as a refrigerant.

  The bathtub 50 includes a bathtub circulation circuit 51 formed by connecting the use side heat exchanger 12 and the bathtub circulation pump 52 in an annular shape.

  The boiling circuit 41 has a suction port connected to a first three-way valve 31 having a first inlet 31 a connected to the lower part (bottom) of the hot water storage tank 10 and an outlet 31 c of the first three-way valve 31. The inflow port is connected to the tank circulation pump 11, the second three-way valve 32 in which the inflow port 32 a is connected to the discharge port of the tank circulation pump 11, and the first outflow port 32 c of the second three-way valve 32. And a heat exchanger 62 for boiling of the heat pump unit 60 connected to the upper part of the hot water storage tank 10.

  The heat source circuit 45 includes a use side heat exchanger 12 having an inlet connected to the upper part of the oil storage tank 10, and a first three-way valve having a second inlet 31 b connected to the outlet of the use side heat exchanger 12. 31, the tank circulation pump 11 having a suction port connected to the outlet 31 c of the first three-way valve 31, and the inlet 32 a is connected to the outlet of the tank circulation pump 11, and the second outlet 32 b is the hot water storage tank 10. And a second three-way valve 32 connected to the lower part of the second.

  In the hot water storage type hot water heater 100 according to the first embodiment, the use side heat exchanger 12 is connected in series to the upstream side of the first three-way valve 31 as described above. As the second three-way valve 32, a valve that can adjust the distribution ratio of the first and second outlets 32c and 32b is used.

  Next, with reference to FIG. 2, an operation of boiling hot water in the hot water storage tank 10 by the boiling circuit 41 will be described. First, the first three-way valve 31 is operated to connect the first inlet 31a and the outlet 31c, and the second inlet 31b is closed. Further, the second three-way valve 32 is operated to connect the inflow port 32a and the first outflow port 32c, and the second outflow port 32b is closed.

  After the operation and setting of the first and second three-way valves 31 and 32, when the tank circulation pump 11 is operated, the hot water sucked from the lower part (bottom part) of the hot water storage tank 10 is converted into the first three-way valve 31, It is returned to the upper part of the hot water storage tank 10 via the circulation pump 11, the second three-way valve 32, and the heating heat exchanger 62.

  At the same time, the heat pump unit 60 is operated, and the refrigerant compressed by the compressor 61 dissipates heat by the boiling heat exchanger 62, is decompressed by the expansion valve 63, absorbs heat by the evaporator 64, and is compressed in the gas state. Inhaled.

  In the boiling heat exchanger 62, the heat of the refrigerant flowing in the boiling heat exchanger 62 heats the hot water flowing in the boiling circuit 41, and the heated hot water becomes high-temperature hot water. Returned and stored.

  The hot water is stored in the upper part of the hot water storage tank 10, and the hot water is sucked out from the lower part (bottom part) of the hot water storage tank 10, so that the hot water is stored in the upper layer in the hot water storage tank 10, Thicken gradually. When it is detected by a temperature sensor (not shown) installed on the lower side of the hot water storage tank 10 that sufficient hot water has been stored in the hot water storage tank 10, the boiling operation is terminated.

  Next, with reference to FIG. 3, the reheating operation of the bathtub 50 using the hot water of the hot water storage tank 10 by the heat source circuit 45 will be described. In the chasing operation of the bathtub 50, the first three-way valve 31 closes the first inlet 31a and allows the second inlet 31b and the outlet 31c to communicate with each other. The second three-way valve 32 allows the inflow port 32a and the second outflow port 32b to communicate with each other and closes the first outflow port 32c.

  When the tank circulation pump 11 is operated after the operation and setting of the first and second three-way valves 31 and 32 described above, the hot water sucked from the upper part of the hot water storage tank 10 is converted into the use side heat exchanger 12 and the first heat exchanger 12. The three-way valve 31, the tank circulation pump 11, and the second three-way valve 32 are returned to the lower part of the hot water storage tank 10. At this time, the heat pump unit 60 is not operated. On the other hand, the bathtub circulation pump 52 is operated, and the heat of the hot water flowing through the heat source circuit 45 is transmitted to the hot water of the bathtub 50 flowing through the bathtub circulation circuit 51 by the use side heat exchanger 12, so that the bathtub 50 is cooked.

  The hot water stored in the upper part of the hot water storage tank 10 is sucked out, and the hot water deprived of heat by the use side heat exchanger 12 is returned to the lower part of the hot water storage tank 10, so that the upper high temperature hot water layer gradually forms in the hot water storage tank 10. getting thin. When a temperature sensor (not shown) installed on the upper side of the hot water storage tank 10 detects that the amount of hot water in the hot water storage tank 10 has become a predetermined amount or less, the reheating operation of the bathtub 50 and the boiling of the hot water storage tank 10 are performed. The heating operation is performed at the same time, and the heat storage amount of the hot water storage tank 10 is maintained.

  Next, with reference to FIG. 4, the simultaneous operation of the reheating operation of the bathtub 50 and the heating operation of the hot water storage tank 10 by the heat source circuit 45 and the boiling circuit 41 will be described. In the simultaneous operation of the reheating operation of the bathtub 50 and the boiling operation of the hot water storage tank 10, the second three-way valve 32 is caused to function as a distribution valve. The distribution valve 32 has one inflow port 32a and first and second outflow ports 32c and 32b, and can arbitrarily change the distribution ratio of the flow rate flowing out to the two outflow ports 32c and 32b. it can.

  When performing the simultaneous operation, the first three-way valve 31 closes the first inlet 31a and allows the second inlet 31b and the outlet 31c to communicate with each other. The second three-way valve 32 allows the inflow port 32a to communicate with the first and second outflow ports 32c and 32b.

  The tank circulation pump 11 is operated, and high-temperature hot water passes from the upper part of the hot water storage tank 10 to the use side heat exchanger 12, the first three-way valve 31, the tank circulation pump 11, and the second outlet 32 b of the second three-way valve 32. The heat source circuit 45 that returns to the lower part of the hot water storage tank 10 and high temperature hot water are supplied from the upper part of the hot water storage tank 10 to the use-side heat exchanger 12, the first three-way valve 31, the tank circulation pump 11, and the second three-way valve 32. The flow rate distribution flowing in the two circuits of the boiling circuit 41 that returns to the upper part of the hot water storage tank 10 via the first outlet 32c and the heating heat exchanger 62, and the distribution ratio of the second three-way valve 32 Adjust by adjusting.

  The flow distribution of the two circuits is adjusted based on the required heating capacity of the bathtub 50 and the heating capacity of the heat pump unit 60, the number of rotations of the bathtub circulation pump 12 is adjusted, and distribution is performed by the second three-way valve 32. Adjust the ratio.

  As described above, the hot water storage type water heater 100 according to the first embodiment can efficiently perform the boiling operation of the hot water storage tank 10 and the reheating operation of the bathtub 50 with the single tank circulation pump 11. The boiling operation of the hot water storage tank 10 and the chasing operation of the bathtub 50 can be performed simultaneously, which is convenient.

Embodiment 2. FIG.
FIG. 5 is a circuit diagram showing Embodiment 2 of the hot water storage type hot water heater according to the present invention, and FIG. 6 shows the flow of hot water during the heat recovery operation of the bathtub hot water of the hot water storage type water heater of Embodiment 2. FIG. In FIG. 5, the same components as those of the hot water storage type hot water heater 100 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, the hot water storage water heater 200 according to the second embodiment is different from the hot water storage water heater 100 according to the first embodiment in that the use-side heat exchanger 12 is connected to the downstream side of the first three-way valve 31. Accordingly, the boiling operation of the hot water storage tank 10 and the reheating operation of the bathtub 50 can be performed, and the heat recovery operation of the bathtub 50 can be performed.

  During the heat recovery operation of the bathtub 50, the first three-way valve 31 closes the second inlet 31b, opens the first inlet 31a, switches the heat source circuit 45 to the heat recovery circuit, and uses side heat exchange. The hot water of the bathtub 50 is collected in the hot water storage tank 10 from the bathtub circulation circuit 51 connected to the vessel 12.

  The second three-way valve 32 communicates the inflow port 32a and the second outflow port 32b, and closes the first outflow port 32c. As shown in FIG. 6, when the tank circulation pump 11 is operated, the hot water sucked from the lower part (bottom part) of the hot water storage tank 10 is converted into the first three-way valve 31, the use side heat exchanger 12, the tank circulation pump 11, and the second The three-way valve 32 is returned to the lower part of the hot water storage tank 10.

  At this time, the bathtub circulation pump 52 is operated, and the detected temperature of a temperature sensor (not shown) installed in the bathtub circulating circuit 51 and the detected temperature of a temperature sensor (not shown) installed below the hot water storage tank 10. Compare. When the temperature of the hot water in the bathtub 50 is higher, it is possible to recover heat from the hot water in the bathtub 50, and the use-side heat exchanger 12 converts the hot water in the bathtub circulation circuit 51 to the heat recovery circuit side. 45, and the heat of the hot water in the bathtub 50 can be recovered in the hot water storage tank 10 via the tank circulation pump 11 and the second three-way valve 32.

  In the hot water storage hot water heaters 100 and 200 of the first embodiment and the second embodiment, the heat pump cycle is a supercritical heat pump cycle in which the refrigerant pressure is equal to or higher than the critical pressure. It is good also as a heat pump cycle below pressure. In this case, chlorofluorocarbon, ammonia, or the like may be used as the refrigerant.

  Moreover, instead of connecting the bathtub 50 to the usage-side heat exchanger 12 via the bathtub circulation circuit 51, a heating unit may be connected, or another usage-side heat exchanger is provided, and the heating unit is connected thereto. You may connect.

  As described above, the hot water storage type hot water supply apparatus according to the present invention can efficiently perform the heating operation of the hot water storage tank, the reheating operation of the bathtub, and the heating operation of the heating unit by one tank circulation pump. Useful as a thing.

It is a circuit diagram which shows Embodiment 1 of the hot water storage type hot water supply device concerning this invention. It is a figure which shows the flow of the warm water at the time of the boiling operation of the hot water storage type water heater of Embodiment 1. FIG. It is a figure which shows the flow of the hot water at the time of the bathtub chasing operation | movement of the hot water storage type water heater of Embodiment 1. FIG. It is a figure which shows the flow of the hot water at the time of the bathtub reheating and boiling-up simultaneous operation | movement of the hot water storage type water heater of Embodiment 1. FIG. It is a circuit diagram which shows Embodiment 2 of the hot water storage type water heater concerning this invention. It is a figure which shows the flow of the hot water at the time of the heat | fever recovery operation of the bathtub hot water of the hot water storage type water heater of Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water supply unit 3 Water supply pipe 5 Hot water supply pipe 10 Hot water storage tank 11 Tank circulation pump 12 Use side heat exchanger 31 Three-way valve 31a First inlet 31b Second inlet 31c Outlet 32 Three-way valve (distribution valve)
32a Inlet 32b Second outlet 32c First outlet 41 Boiling circuit 45 Heat source circuit 50 Bath 51 Bath tub circulation circuit 52 Bath circulation pump 60 Heat pump unit 61 Compressor 62 Heating exchanger for boiling 63 Expansion valve 64 Evaporation 65 Heat pump circuit 100,200 Hot water storage type hot water heater

Claims (5)

A hot water storage tank for storing heated hot water and supplied water;
A first three-way valve having a first inlet connected to a lower portion of the hot water storage tank; a tank circulation pump having a suction port connected to an outlet of the first three-way valve; and a discharge port of the tank circulation pump A second three-way valve having an inlet connected thereto, and a boiling heat exchanger having an inlet connected to a first outlet of the second three-way valve and an outlet connected to an upper portion of the hot water storage tank A boiling circuit comprising:
The first three-way valve having a second inlet connected to the upper part of the hot water storage tank, the tank circulation pump having an inlet connected to the outlet of the first three-way valve, and the tank circulation pump A heat source circuit comprising: the second three-way valve having an inlet connected to the discharge port and a second outlet connected to a lower portion of the hot water storage tank;
A use side heat exchanger connected in series in the heat source circuit;
A hot water storage type water heater characterized by comprising:   The hot water storage type hot water supply apparatus according to claim 1, wherein the use side heat exchanger is connected to an upstream side of the first three-way valve of the heat source circuit.   The hot water storage type water heater according to claim 1, wherein the use side heat exchanger is connected to the heat source circuit on the downstream side of the first three-way valve.   When simultaneously performing the boiling operation of the hot water storage tank and the heat utilization operation by the use side heat exchanger, the second three-way valve adjusts the flow rate distribution ratio between the boiling circuit and the heat source circuit. The hot water storage type water heater according to any one of claims 1 to 3.   The first three-way valve closes the second inlet, opens the first inlet, switches the heat source circuit to a heat recovery circuit, and switches from the bathtub circulation circuit connected to the use side heat exchanger to the bathtub. The hot water storage type water heater according to claim 3, wherein the heat of the hot water is collected in the hot water storage tank.

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