JP5090019B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type water heater that supplies hot water from a hot water storage tank.

  As a conventional water heater, there is one as shown in FIG. 6 (see, for example, Patent Document 1). As shown in FIG. 6, the hot water storage type water heater 200 includes a hot water storage tank unit 101 having a hot water storage tank 102 and a heat pump unit 103 as a heating means for heating water. The hot water storage tank unit 101 is connected to a hot water supply terminal 104 such as a faucet or a shower and a bathtub 106 by piping. The hot water storage tank 102 and the heat pump unit 103 are connected in an annular shape by a heat pump inlet pipe 110 and a heat pump outlet pipe 111. The water at the bottom of the hot water storage tank 102 is sent to the water heat exchanger of the heat pump unit 103 via the heat pump inlet pipe 110 and heated to hot water. The hot water is returned to the upper part of the hot water storage tank 102 via the heat pump hot water discharge pipe 111.

  When the hot water in the hot water storage tank 102 is used at the hot water supply terminal 104, the hot water stored in the upper part of the hot water storage tank 102 passes through the hot water pipe 108, the intermediate water mixing valve 114 and the first hot water pipe 115, In 116, it is mixed with water in the water supply pipe 109, adjusted to a predetermined first hot water supply temperature, and then supplied from the hot water supply pipe 117 to the hot water supply terminal 104. The first hot water supply temperature can be set to a desired temperature (usually a maximum of 60 ° C.) by the user by inputting to the hot water supply control terminal 105.

  When the hot water in the hot water storage tank 102 is used to fill the bathtub 106, the hot water stored in the upper part of the hot water storage tank 102 passes through the hot water pipe 108, the intermediate water mixing valve 114, and the first hot water pipe 115, The water is mixed with water in the water supply pipe 109 by the bath mixing valve 118, adjusted to a predetermined bath hot water temperature, and then supplied from the hot water pipe 119 to the bathtub 106. The bath hot water temperature can be set to a desired temperature (usually a maximum of 60 ° C.) by the user by inputting to the bath control terminal 107.

  Furthermore, according to the hot water storage type water heater 200, a bath heating operation (so-called memorial operation) is possible in which the hot water in the hot water storage tank 102 is used to heat the water in the bathtub 106. Hot water stored in the upper part of the hot water storage tank 102 is sent from the primary side forward pipe 123 to the bath heat exchanger 129, and passes through the primary side pump 125 and the primary side return pipe 124. Returned to the bottom. The water in the bathtub 106 is sent from the secondary-side forward pipe 126 to the bath heat exchanger 129 and returned to the bathtub 106 via the secondary-side pump 128 and the secondary-side return pipe 127. In the bath heat exchanger 129, the hot water in the hot water storage tank 102 and the water in the bathtub 106 exchange heat, whereby the water in the bathtub 106 is heated. The memory temperature can be set by the bath control terminal 107.

In this way, the hot water storage type water heater 200 shown in FIG. 6 can not only supply hot water in the hot water storage tank 102 to the hot water supply terminal 104 and the bathtub 106 at different temperatures, but also can perform bath heating operation using the hot water in the hot water storage tank 102. This is very convenient.
JP-A-2005-274132

  If one unit of hot water storage type water heater shown in FIG. 6 can be shared by a plurality of households, for example, a plurality of households such as a two-family house or an apartment house, the equipment cost can be greatly reduced. However, the conventional hot water storage type water heater is not intended to be shared by a plurality of households.

  In view of the above circumstances, an object of the present invention is to provide a hot water storage type hot water supply apparatus that can supply hot water in a hot water storage tank to each of a hot water supply terminal and a bathtub at individual set temperatures and is suitable for sharing by a plurality of households. To do.

That is, the present invention
A heating device for heating water;
A hot water storage tank for storing hot water heated by a heating device;
A first hot water supply line for mixing hot water and hot water in a hot water storage tank in a first hot water mixing valve, and supplying hot water adjusted to a predetermined first hot water temperature to a first hot water terminal such as a faucet or shower;
First hot water temperature setting means for setting a first hot water temperature used for controlling the first hot water mixing valve based on an input made by a user of the first hot water terminal;
A first bath hot water supply line for mixing hot water and hot water in a hot water storage tank in a first bath mixing valve and supplying hot water adjusted to a predetermined first bath hot water temperature to the first bathtub;
A first bath temperature setting means for setting a first bath hot water temperature used for controlling the first bath mixing valve based on an input made by a user of the first bathtub;
A second hot water supply line for mixing hot water and hot water in a hot water storage tank at a second hot water mixing valve and supplying hot water adjusted to a predetermined second hot water temperature to a second hot water terminal such as a faucet or shower;
Second hot water supply temperature setting means for setting a second hot water supply temperature used for controlling the second hot water supply mixing valve based on an input made by a user of the second hot water supply terminal;
A second bath hot water supply line for mixing hot water and hot water in a hot water storage tank in a second bath mixing valve and supplying hot water adjusted to a predetermined second bath hot water temperature to the second bathtub;
A second bath temperature setting means for setting a second bath hot water temperature used for controlling the second bath mixing valve based on an input made by a user of the second bathtub;
A hot water storage type water heater equipped with

In another aspect, the present invention provides:
A heating device for heating water;
A hot water storage tank for storing hot water heated by a heating device;
A first hot water supply line for mixing hot water and hot water in a hot water storage tank in a first hot water mixing valve, and supplying hot water adjusted to a predetermined first hot water temperature to a first hot water terminal such as a faucet or shower;
First hot water temperature setting means for setting a first hot water temperature used for controlling the first hot water mixing valve based on an input made by a user of the first hot water terminal;
A hot water supply line for mixing hot water and hot water in a hot water storage tank in a bath mixing valve and supplying hot water adjusted to a predetermined hot water temperature to the bathtub,
A bath temperature setting means for setting a bath hot water temperature used for controlling the bath mixing valve based on an input made by a user of the bathtub;
A second hot water supply line for mixing hot water and hot water in a hot water storage tank at a second hot water mixing valve and supplying hot water adjusted to a predetermined second hot water temperature to a second hot water terminal such as a faucet or shower;
Second hot water supply temperature setting means for setting a second hot water supply temperature used for controlling the second hot water supply mixing valve based on an input made by a user of the second hot water supply terminal;
A hot water storage type water heater equipped with

  The former of the hot water storage type hot water heater according to the present invention is capable of using the hot water in the hot water storage tank at individual hot water supply temperatures, the first hot water supply pipe, the first bath hot water supply pipe, the second hot water supply pipe, and the second bath hot water supply pipe. It has a road. The latter of the hot water storage type hot water heater of the present invention includes a first hot water supply pipe, a first bath hot water supply pipe, and a second hot water supply pipe that can use the hot water in the hot water storage tank at individual hot water supply temperatures. Thus, the convenience for the user is improved by increasing the number of hot water supply pipes that can supply hot water at individual temperatures. Furthermore, it becomes possible to share one unit of hot water heater with multiple households, and the installation space and cost of the hot water heater can be reduced.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a hot water storage type water heater according to a first embodiment of the present invention. The hot water storage type hot water heater 100A includes a heat pump unit 3, a hot water storage tank unit 1A, a main controller 50, and control terminals 8, 9, 10, and 11. Hot water can be supplied to each of the plurality of hot water supply terminals 4 and 5 and the plurality of bathtubs 6 and 7 at individual set temperatures. Such a hot water storage type water heater 100A is suitable for a two-family house, for example. Hereinafter, “hot water storage type hot water heater” is abbreviated as “hot water heater”.

  The hot water supply terminals 4 and 5 include a first hot water supply terminal 4 and a second hot water supply terminal 5. The first hot water supply terminal 4 is, for example, a faucet 4a and / or a shower 4b. Similarly, the 2nd hot water supply terminal 5 is the faucet 5a and / or the shower 5b.

  The heat pump unit 3 is a heating device that heats water, a compressor that compresses the refrigerant, a radiator that radiates the compressed refrigerant, an expansion valve that expands the radiated refrigerant, and an evaporation that evaporates the expanded refrigerant. It is comprised by the freezing apparatus which has a container. Heat exchange between the refrigerant and water is performed in the radiator, and hot water of about 90 ° C. at maximum can be boiled. According to the method of heating water using a heat pump cycle (refrigeration cycle), high energy efficiency can be achieved as compared with a method of heating water using an electric heater.

  As the refrigerant of the heat pump unit 3, for example, carbon dioxide can be used. Carbon dioxide, which is a natural refrigerant, has an ozone depletion coefficient of zero and a global warming coefficient that is very low, about 1/700 of HFC-407C, which is an alternative refrigerant.

  The hot water storage tank unit 1A includes a hot water storage tank 2 that stores hot water heated by the heat pump unit 3, a hot water storage pipe 51 that connects the heat pump unit 3 and the hot water storage tank 2 in an annular shape, and hot water in the hot water storage tank 2 at a predetermined hot water supply temperature. A plurality of hot water supply pipes 52, 53, 55, 56 that are adjusted and supplied to the hot water supply terminals 4, 5 and the bathtubs 6, 7, and a plurality of water that heats the water in the bathtubs 6, 7 using the hot water in the hot water storage tank 2. Bath heating pipelines 54 and 57, and a water supply pipeline 14 for replenishing the bottom of the hot water storage tank 2 and supplying water used to adjust the hot water temperature to the hot water pipelines 52, 53, 55 and 56, respectively. Yes.

  A plurality of tank temperature sensors 46 are provided on the inner wall surface of the hot water storage tank 2 along the height direction. The temperature distribution in the height direction of the hot water stored in the hot water storage tank 2 by the tank temperature sensor 46, in other words, the amount of hot water can be detected. By monitoring the temperature distribution in the hot water storage tank 2 using the tank temperature sensor 46, an appropriate amount of hot water can be stored in the hot water storage tank 2.

  Although the capacity | capacitance of the hot water storage tank 2 is not specifically limited, For example, it is preferable that they are 450 liters or more and 600 liters or less. With such a capacity, when one unit of water heater 100A is shared by two households, it is possible to prevent the occurrence of extra boiling operation and hot water shortage, and high operating efficiency can be expected. In addition to setting the capacity of the hot water storage tank 2 in the above range, the rated heating capacity of the heat pump unit 3 may be set to, for example, 5 kW or more (preferably 5.4 kW or more) 7 kW or less.

  The hot water storage pipe 51 is constituted by a heat pump water inlet pipe 43, a heat pump hot water outlet pipe 45, and a heat pump circulation pump 44. One end of the heat pump inlet pipe 43 is connected to the bottom of the hot water storage tank 2 and the other end is connected to the heat pump unit 3. One end of the heat pump hot water discharge pipe 45 is connected to the heat pump unit 3 and the other end is connected to the upper part of the hot water storage tank 2. In response to the operation of the heat pump circulation pump 44, the water at the bottom of the hot water storage tank 2 flows through the heat pump water inlet pipe 43 and is sent to the heat pump unit 3. The hot water heated by the heat pump unit 3 flows through the heat pump hot water discharge pipe 45 and is returned to the upper part of the hot water storage tank 2.

  The hot water supply pipes 52, 53, 55 and 56 adjust the hot water in the hot water storage tank 2 to the first hot water supply temperature and supply the hot water in the hot water storage tank 2 to the first hot water supply terminal 4 and the second hot water in the hot water storage tank 2. A second hot water supply line 55 that adjusts the hot water temperature to be supplied to the second hot water supply terminal 5 and a first bath hot water supply line that adjusts the hot water in the hot water storage tank 2 to the first bath hot water temperature and supplies it to the first bathtub 6. 53 and a second bath hot water supply pipe 56 for adjusting the hot water in the hot water storage tank 2 to the second bath hot water temperature and supplying the hot water to the second bathtub 7.

  The first hot water supply pipe 52 is constituted by a hot water supply hot water supply pipe 12, a first hot water supply mixing valve 17, and a first hot water supply pipe 21. The first hot water supply pipe 21 has one end connected to the first hot water supply terminal 4 and the other end connected to the first hot water supply mixing valve 17. One end of the hot water supply hot water supply pipe 12 is connected to the upper part of the hot water storage tank 2, and the other end is connected to the first hot water supply mixing valve 17. The first hot water mixing valve 17 is disposed between the first hot water supply terminal 4 and the hot water storage tank 2, hot water sent from the hot water storage tank 2 via the hot water supply hot water piping 12, and the water supply line 14. The water sent from the (branch water supply pipe 14b) is mixed at a predetermined ratio to adjust the temperature of the hot water. The hot water whose temperature has been adjusted in the first hot water supply mixing valve 17 flows through the first hot water supply pipe 21 and is supplied to the first hot water supply terminal 4. In order to detect the temperature of the hot water flowing through the first hot water supply pipe 21, a first hot water supply temperature sensor 23 composed of a thermistor or the like is provided inside the first hot water supply pipe 21.

  The second hot water supply pipe 55 is constituted by the hot water supply hot water discharge pipe 12, the second hot water supply mixing valve 18 and the second hot water supply pipe 22, and has the same configuration and the same function as the first hot water supply pipe 52. In order to detect the temperature of the hot water flowing through the second hot water supply pipe 22, a second hot water supply temperature sensor 24 is provided inside the second hot water supply pipe 22.

  The hot water supply outlet pipe 12 has an end bifurcated on the side opposite to the side connected to the hot water storage tank 2, and one of the branched end portions is the first hot water supply line 52. One hot water supply mixing valve 17 is connected, and the other is connected to the second hot water supply mixing valve 18 of the second hot water supply pipe 55. That is, the hot water supply hot water supply pipe 12 is shared as a part of each of the first hot water supply pipe line 52 and the second hot water supply pipe line 55.

  The first bath hot water supply pipe 53 is constituted by a bath hot water supply pipe 13, a first bath mixing valve 19, a first bath hot water supply electromagnetic valve 27, and a first bath hot water supply pipe 25. One end of the first bath hot water supply pipe 25 is indirectly connected to the first bath 6 via the first bath heating pipe 54, and the other end is connected to the first bath mixing valve 19. One end of the hot water supply pipe 13 for bath is connected to the upper part of the hot water storage tank 2, and the other end is connected to the first bath mixing valve 19. The 1st bath mixing valve 19 is arrange | positioned between the 1st bathtub 6 and the hot water storage tank 2, the hot water sent from the hot water storage tank 2 via the hot water supply piping 13 for baths, and the water supply line 14 ( Water supplied from the branch water supply pipe 14b) is mixed at a predetermined rate to adjust the temperature of the hot water. The hot water whose temperature is adjusted in the first bath mixing valve 19 flows through the first bath hot water supply pipe 25 and the first bath heating pipe 54 and is supplied to the first bathtub 6. The first bath hot water solenoid valve 27 prevents back flow of hot water from the first bathtub 6 to the hot water storage tank 2. In order to detect the temperature of the hot water flowing through the first bath hot water supply pipe 25, the first bath hot water supply 25 is provided inside the first bath hot water supply pipe 25 between the first bath hot water supply electromagnetic valve 27 and the first bath mixing valve 19. A temperature sensor 29 is provided.

  The second bath hot water supply pipe 56 is configured by the bath hot water supply pipe 13, the second bath mixing valve 20, the second bath hot water solenoid valve 28, and the second bath hot water supply pipe 26, and has the same configuration as the first hot water supply pipe 52. And has the same function. In order to detect the temperature of the hot water flowing through the second bath hot water supply pipe 26, the second bath hot water supply is provided inside the second bath hot water supply pipe 26 between the second bath hot water solenoid valve 28 and the second bath mixing valve 20. A temperature sensor 30 is provided.

  The hot water discharge pipe 13 has an end branched into three crotches on the side opposite to the side connected to the hot water storage tank 2, and one of the branched ends is a first bath mixing valve 19. The other one is connected to the second bath mixing valve 20 and the other one is connected to the pressure relief valve 16. That is, the bath hot water supply pipe 13 is shared as a part of each of the first bath hot water supply pipe 53 and the second bath hot water supply pipe 56.

  The bath heating pipelines 54 and 57 use the hot water of the hot water storage tank 2 to heat the water (or hot water) of the first bathtub 6 and the hot water of the hot water storage tank 2 and And a second bath heating pipe 57 for heating water (or hot water) in the bathtub 7.

  The first bath heating pipe 54 is constituted by a primary side pipe 33, a first bath remedy pump 35, a secondary side pipe 41, a first bath circulation pump 37, and a first bath heat exchanger 31. The primary side pipe 33 has one end connected to the bath hot water supply pipe 13 and the other end connected to the bottom of the hot water storage tank 2. Both ends of the secondary side pipe 41 are connected to the first bathtub 6. An annular primary side pipe is formed by the hot water storage tank 2, the bath outlet pipe 13, the primary side pipe 33 and the first bath heat exchanger 31, and the first bathtub 6, the secondary side pipe 41 and the first bath heat are formed. An annular secondary pipe is formed by the exchanger 31. The first bath heat exchanger 31 is, for example, a double tube heat exchanger. In the first bath heat exchanger 31, the flow direction of hot water sent from the hot water storage tank 2 and the flow direction of water (or hot water) sent from the first bathtub 6 are opposite to each other.

  By driving the first bath memory pump 35, hot water stored in the upper part of the hot water storage tank 2 flows through the primary side pipe 33 and is sent to the first bath heat exchanger 31. By driving the first bath circulation pump 37, the water (or hot water) in the first bathtub 6 flows through the secondary pipe 41 and is sent to the first bath heat exchanger 31. In the first bath heat exchanger 31, the water (or hot water) in the first bathtub 6 and the hot water in the hot water storage tank 2 exchange heat. The hot water in the hot water storage tank 2 that has exchanged heat with the water (or hot water) in the first bathtub 6 in the first bath heat exchanger 31 is returned to the bottom of the hot water storage tank 2. The hot water (or water) in the first bath 6 that has exchanged heat with the hot water in the hot water storage tank 2 in the first bath heat exchanger 31 is returned to the first bath 6. A first bath temperature sensor 39 that detects the hot water temperature of the first bath 6 is provided at the inlet of the first bath circulation pump 37.

  The second bath heating pipe 57 is constituted by the primary side pipe 34, the secondary side pipe 42, the second bath memorial pump 36, the second bath circulation pump 38, and the second bath heat exchanger 32, and the first bath The heating pipe line 54 has the same configuration and the same function. A second bath temperature sensor 40 that detects the temperature of the hot water in the second bathtub 7 is provided at the inlet of the second bath circulation pump 38.

  In the present embodiment, the first bath heating conduit 54 and the second bath heating conduit 57 have bath heat exchangers 31 and 32, respectively, and can function independently. Yes. That is, it is possible to simultaneously perform heating of water or hot water in the first bathtub 6 by the first bath heat exchanger 31 and heating of water or hot water in the second bathtub 7 by the second bath heat exchanger 32, Very convenient.

  The main controller 50 is constituted by a microcomputer or a DSP (digital signal processor), and acquires detection signals of various temperature sensors 23, 24, 29, 30, 39, 40, and 46 as necessary. The control of the heat pump unit 3, the control of the various mixing valves 17 to 20, and the control of the various pumps 35 to 38, 44 are performed.

  The control terminals 8 to 11 include a first hot water supply control terminal 8, a second hot water supply control terminal 9, a first bath control terminal 10 and a second bath control terminal 11. These control terminals 8 to 11 are composed of a microcomputer, an input unit for a user to make various settings, a monitor for displaying hot water usage status and hot water set temperature, and the like, and can communicate with the main controller 50. It is connected to the.

  The first hot water supply control terminal 8 is installed in a home kitchen or washroom where the first hot water supply terminal 4 is located. By operating the first hot water supply control terminal 8, the user can set the temperature of the hot water supplied to the first hot water supply terminal 4 to a desired first hot water supply temperature (usually a maximum of 60 ° C.). That is, the first hot water supply control terminal 8 functions as first hot water supply temperature setting means for setting the first hot water supply temperature used for controlling the first hot water supply mixing valve 17 based on the input made by the user of the first hot water supply terminal 4. To do. The main controller 50 is notified of the first hot water supply temperature input and set in the first hot water supply control terminal 8. The main controller 50 controls the first hot water mixing valve 17 so that the temperature detected by the first hot water temperature sensor 23, in other words, the temperature of the hot water supplied to the first hot water supply terminal 4 matches the first hot water temperature. The mixing ratio of hot water and water supply in the first hot water supply mixing valve 17 is adjusted.

  The 2nd hot water supply control terminal 9 has the same function and the same structure as the 1st hot water supply control terminal 8, and is installed in the place where the 2nd hot water supply terminal 5 exists. The main controller 50 is notified of the second hot water temperature input and set in the second hot water control terminal 9 as the second hot water temperature setting means. The main controller 50 controls the second hot water mixing valve 18 so that the detected temperature of the second hot water temperature sensor 24 matches the second hot water temperature, and sets the mixing ratio of hot water and water in the second hot water mixing valve 18. Adjust.

  The first bath control terminal 10 is installed in a bathroom in the home where the first bathtub 6 is located. By operating the first bath control terminal 10, the user can set the temperature of hot water supplied to the first bathtub 6 to a desired first bath hot water temperature (usually about 32 ° C. to 48 ° C.). In addition, the reheating temperature of the hot water (or water) of the first bathtub 6 can be set to a desired first bath temperature (usually about 32 ° C. to 48 ° C.). That is, the first bath control terminal 10 determines the first bath hot water temperature used for controlling the first bath mixing valve 19 and the heat in the first bath heating line 54 based on the input made by the user of the first bathtub 6. It functions as a first bath temperature setting means for setting the first bath temperature used for the exchange control. The main controller 50 is notified of the first bath hot water temperature and the first bath temperature input and set in the first bath control terminal 10. The main controller 50 controls the first bath / hot water mixing valve 19 to make the temperature detected by the first bath / hot water temperature sensor 29, in other words, the temperature of the hot water supplied to the first bath 6 match the first bath / hot water temperature. And the mixing ratio of hot water and water supply in the first bath / hot water mixing valve 19 is adjusted. After the start of the memorial operation, the main controller 50 starts the first bath memorial pump 35 until the temperature detected by the first bath temperature sensor 39, in other words, the temperature of the hot water in the first bath 6 reaches the first bath temperature. And the 1st bath circulation pump 37 is driven.

  The 2nd bath control terminal 11 has the same function and the same structure as the 1st bath control terminal 10, and is installed in the bathroom of a home with the 2nd bathtub 7. FIG. The main controller 50 is notified of the second bath water supply temperature and the second bath temperature input and set in the second bath control terminal 11 as the second bath temperature setting means. The main controller 50 controls the second bath / hot water mixing valve 20 so that the temperature detected by the second bath / hot water temperature sensor 30 coincides with the second bath / hot water temperature, and hot water and water supply in the second bath / hot water mixing valve 20 are controlled. Adjust the mixing ratio with. After the start of the chasing operation, the main controller 50 drives the second bath chasing pump 36 and the second bath circulation pump 38 until the temperature detected by the second bath temperature sensor 40 reaches the second bath temperature.

  The water supply pipe 14 is constituted by a main water supply pipe 14 a, a branch water supply pipe 14 b, a pressure reducing valve 15, and a water supply pressurizing pump 46. The main water supply pipe 14a is a pipe that connects the hot water storage tank 2, the pressure reducing valve 15, the water supply pressurization pump 46, and an external water pipe (not shown) in this order. The branch water supply pipe 14 b has one end connected to the main water supply pipe 14 a and the other end connected to each mixing valve 17, 18, 19, 20. Water used for adjusting the temperature of the hot water is supplied to the hot water supply pipes 52, 53, 55, and 56 through the branch water supply pipe 14b. The pressure reducing valve 15 is disposed upstream of the connection position between the main water supply pipe 14a and the branch water supply pipe 14b when viewed from the hot water storage tank 2 with respect to the water flow direction. Depending on the specifications of the pressure reducing valve 15, the hot water supply pressure in each of the hot water supply pipes 52, 53, 55 and 56 is determined. The hot water pressurizing pump 46 is disposed further upstream than the pressure reducing valve 15 when viewed from the hot water storage tank 2. For example, when the total flow rate of the hot water supply pipes 52, 53, 55, 56 exceeds a predetermined value. It is a booster that operates.

  If hot water is simultaneously used in the hot water supply terminals 4 and 5 and the bathtubs 6 and 7, the amount of hot water supply may be reduced to the extent that the user of the hot water supply terminals 4 and 5 can feel the lack of hot water. By operating the feed water pressurizing pump 46, the discharge pressure of the hot water supply pipes 52 and 55 for supplying hot water to the hot water supply terminals 4 and 5 can be maintained high, and a sufficient amount of water is supplied to the hot water supply terminals 4 and 5. It becomes possible to supply hot water. When the feed water pressurizing pump 46 is provided, it is appropriate that the set pressure of the pressure reducing valve 15 is, for example, 70 kPa or more and 170 kPa or less.

  The timing for operating the water supply pressurizing pump 46 is not particularly limited, but the water supply pressurization is performed according to the discharge pressure of the hot water supply pipes 52 and 55 for supplying hot water to the hot water supply terminals 4 and 5 being reduced to a predetermined pressure. The pump 46 may be activated. Generally, when the amount of hot water supplied to the showers 4b and 5b falls below about 8 liters / minute, the user starts to feel that the amount of hot water is insufficient. Therefore, when the discharge pressure of the hot water supply pipes 52 and 55 is lowered so that such a hot water supply amount cannot be achieved, the water supply pressurizing pump 46 can be operated. The discharge pressure of the hot water supply pipes 52 and 55 can be detected by providing a pressure sensor in the hot water supply pipes 21 and 22, for example. The main control unit 50 acquires the detection signal of such a pressure sensor periodically or as necessary. Based on the acquired detection signal, the discharge pressure of the hot water supply pipes 21 and 22 is identified. When the discharge pressure falls below a predetermined pressure, the feed water pressurizing pump 46 is started.

  Of course, the feed water pressurizing pump 46 is not essential. When the water supply pressurizing pump 46 is not provided, for example, by setting the pressure setting of the pressure reducing valve 15 to 150 kPa to 350 kPa (preferably 200 kPa to 300 kPa), sufficient hot water supply is possible even when simultaneous hot water supply is performed. The amount can be secured. However, by using the water supply pressurizing pump 46, the responsiveness when the total flow rate of the hot water supply pipes 52, 53, 55, 56 greatly fluctuates is improved, and the user feels uncomfortable while using the hot water supply terminals 4, 5 Can be reduced.

  In the present embodiment, the feed water pressurizing pump 46 is provided upstream of the pressure reducing valve 15 to increase the discharge pressure of the hot water supply pipes 52 and 55, but the downstream side of the pressure reducing valve 15, for example, A water supply pressure pump 46 may be provided in the main water supply pipe 14a. Further, a configuration is provided in which a hot water pressurizing pump 46 is provided in the first hot water supply pipe 21 of the first hot water supply pipe 52 and the second hot water supply pipe 22 of the second hot water supply pipe 55 to increase the discharge pressure of the hot water supply pipes 52 and 55. It is good. Furthermore, you may use the said structure together.

Next, the operation of the water heater 100A will be described.
When the first hot water supply terminal 4 is opened, the hot water in the hot water storage tank 2 is mixed with the water in the branch water supply pipe 14b in the first hot water supply mixing valve 17 and supplied to the first hot water supply terminal 4 at the first hot water supply temperature. When the second hot water supply terminal 5 is opened, the hot water in the hot water storage tank 2 is adjusted to the second hot water supply temperature and supplied to the second hot water supply terminal 5.

  When the hot water filling switch of the first bath control terminal 10 is turned on, the first bath hot water solenoid valve 27 is opened, and hot water supply to the first bathtub 6 is started. Hot water in the hot water storage tank 2 is mixed with water in the branch water supply pipe 14b in the first bath mixing valve 19 and supplied to the first bathtub 6 at the first bath hot water temperature. When the hot water filling switch of the second bath control terminal 11 is turned on, the second bath hot water solenoid valve 28 is opened, and hot water adjusted to the second bath hot water temperature is supplied to the second bathtub 7.

  When the remedy switch of the first bath control terminal 10 is turned on, the first bath remedy pump 35 and the first bath circulation pump 37 are started, that is, the first bath heating operation is started. The hot water stored in the upper part of the hot water storage tank 2 circulates through the primary side pipe 33 by the action of the first bath memory pump 35 and is sent to the first bath heat exchanger 31, and the water and heat of the first bath 6 After the replacement, the hot water storage tank 2 is returned to the bottom. On the other hand, the water (or hot water) in the first bathtub 6 is sent to the first bath heat exchanger 31 through the secondary pipe 41 by the action of the first bath circulation pump 37, and the hot water and heat in the hot water storage tank 2. It is returned to the 1st bathtub 6 after exchanging and heating. When the temperature detected by the first bath temperature sensor 39 reaches the first bath temperature, the first bath memory pump 35 and the first bath circulation pump 37 are stopped, and the first bath heating operation is ended.

  When the memory switch of the second bath control terminal 11 is turned on, the second bath heating operation starts. The hot water in the second bathtub 7 is heated by exchanging heat with the hot water in the hot water storage tank 2. When the temperature detected by the second bath temperature sensor 40 reaches the second bath temperature, the second bath memory pump 36 and the second bath circulation pump 38 are stopped, and the second bath heating operation is finished.

  As described above, in the water heater 100A, the first hot water supply temperature, the second hot water supply temperature, the first bath hot water temperature, and the second bath hot water temperature can be set individually, so that convenience and comfort for the user are high. In addition to supplying hot water from the hot water storage tank 2 to the hot water supply terminals 4 and 5, the hot water storage tank 2 can be used for bath heating operation of the first bathtub 6 and the second bathtub 7.

  In addition, the hot water supply terminals 4 and 5 and the bathtubs 6 and 7 may be installed in one household, or may be installed in a plurality of households. For example, the first hot water supply terminal 4 and the first bathtub 6 can be installed in one household, and the second hot water supply terminal 5 and the second bathtub 7 can be installed in another household. That is, by sharing one unit of water heater 100A among a plurality of households, it is possible to reduce the installation space and installation cost of the water heater 100A, and it is possible to obtain advantages in terms of workability and economy.

  By the way, when one unit of the water heater 100A is shared by two households, it is assumed that problems due to the sharing become obvious. For example, if hot water starts to be applied to the bathtub 7 (second bathtub 7) in one household while using the shower 4a in one household, the effect appears in the shower 4a in use, which is inconvenient for the user. May give a pleasant feeling. In order to prevent the problem of fluctuations in the amount of hot water supplied, the six hot water supply pipes 52, 53, 55, 56 and the bath heating pipes 54, 57 are connected directly from the upper part of the hot water storage tank 2. And it is preferable to extend separately. However, the space above the hot water storage tank 2 is limited, and it is difficult to individually extend such a large number of pipelines from the upper part of the hot water storage tank 2, and the processing costs such as brazing of the piping increase. There is also.

  Therefore, in the present embodiment, the following configuration is adopted. The hot water heater 100 </ b> A includes a hot water supply hot water pipe 12 connected to the upper part of the hot water storage tank 2, and a bath hot water supply pipe 13 connected to the upper part of the hot water storage tank 2, separately from the hot water supply hot water supply pipe 12. The hot water supply hot water supply pipe 12 is shared as a part of each of the first hot water supply pipe 52 and the second hot water supply pipe 55, and the bath hot water supply pipe 13 is used as the first bath hot water supply pipe 53 (primary side) and the first bath. The heating pipe 54, the second bath hot water supply pipe 56, and the second bath heating pipe 57 (primary side) are shared as a part of each. That is, the start ends of the two hot water supply pipes 52 and 55 for supplying hot water to the hot water supply terminals 4 and 5 are combined into one pipe 12, and the start ends of the hot water supply pipes 53 and 56 for supplying hot water to the bathtubs 6 and 7, The primary ends of the bath heating pipes 54 and 57 that replenish hot water in the bathtubs 6 and 7 are combined into a single pipe 13. There is no shared portion between the hot water supply pipes 52 and 55 which are problematic when the pressure fluctuation is large and the bath side pipes 53, 54, 56 and 57 which are not problematic even if there is some pressure fluctuation. In this way, even if hot water filling of the bathtubs 6 and 7 is started while the hot water supply terminals 4 and 5 are used, it is difficult for the hot water supply terminals 4 and 5 to be affected, thereby minimizing user discomfort. It can be stopped.

  In addition, although the hot water heater 100A of the present embodiment includes the second bath hot water supply pipe 56 and the second bath heating pipe 57, the hot water heater 100A may include only the second bath hot water supply pipe 56, Only the second bath heating pipe 57 may be provided. In the former case, the bath discharge pipe 13 can be shared as a part of each of the first bath hot water supply pipe 53, the first bath heating pipe 54 (primary side), and the second bath hot water supply pipe 56. In the latter case, the bath discharge pipe 13 is a part of each of the first bath hot water supply pipe 53, the first bath heating pipe 54 (primary side), and the second bath heating pipe 57 (primary side). Can be shared. Moreover, the bath heating pipelines 54 and 57 can be omitted, and this is common to other embodiments.

(Second Embodiment)
FIG. 2 is a configuration diagram of a water heater according to the second embodiment. The difference between the water heater 100 </ b> B of the present embodiment and the water heater 100 </ b> A of the first embodiment is in the way of sharing piping in the upper part of the hot water storage tank 2.

  The hot water heater 100B (hot water storage tank unit 1B) includes a first hot water supply pipe 64 connected to the upper part of the hot water storage tank 2 and a second hot water supply pipe 65 connected to the upper part of the hot water storage tank 2 separately from the first hot water supply pipe 64. And. A first hot water supply pipe 64 is shared as a part of each of the first hot water supply pipe line 52, the first bath hot water supply pipe line 53 and the first bath heating pipe line 54 (primary side), and the second hot water supply pipe 65 is provided. The second hot water supply pipe 55, the second bath hot water supply pipe 56 and the second bath heating pipe 57 (primary side) are shared as a part of each.

  The first hot water supply pipe 52, the first bath hot water supply pipe 53 and the first bath heating pipe 54 are for one household, the second hot water supply pipe 55, the second bath hot water supply pipe 56 and the second bath heating pipe 57. If there is a clear usage division for the other household, the sharing method as in this embodiment is suitable. This is because it is difficult for one household to start filling the bathtub 6 while taking the shower 4b, and filling the bathtub 6 while using the hot water at the faucet 4a. This is because the user can know the start of the hot water filling in advance. Therefore, even with the configuration of the present embodiment, it is possible to minimize user discomfort.

  In addition, the hot water heater 100B of the present embodiment may include only one of the second bath hot water supply pipe 56 and the second bath heating pipe 57 as described in the first embodiment.

(Third embodiment)
FIG. 3 is a configuration diagram of a water heater according to the third embodiment. The difference between the hot water heater 100C of the present embodiment and the hot water heater 100A of the first embodiment is in the way of sharing the piping in the upper part of the hot water storage tank 2.

  The hot water heater 100C (hot water storage tank unit 1C) includes a first hot water supply pipe 62 connected to the upper part of the hot water storage tank 2 and a second hot water supply pipe 63 connected to the upper part of the hot water storage tank 2 separately from the first hot water supply pipe 62. In addition to the first and second hot water supply pipes 62, 63, a hot water supply pipe 13 connected to the upper part of the hot water storage tank 2 is provided. The first hot water supply pipe 62 is a pipe dedicated to the first hot water supply pipe 52, and the second hot water supply pipe 63 is a pipe dedicated to the second hot water supply pipe 55. As for the hot water supply pipe 13 for the bath, as described in the first embodiment, the first bath hot water supply pipe 53, the first bath heating pipe 54, the second bath hot water supply pipe 56, and the second bath heating pipe 57 are provided. Shared as part of each. In this way, although the number of pipes connected to the upper part of the hot water storage tank 2 is increased, there is an advantage that the influence of fluctuations in the amount of hot water supply is more difficult for the hot water supply terminals 4 and 5.

(Fourth embodiment)
FIG. 4 is a configuration diagram of a water heater according to the fourth embodiment. The hot water heater 100D of the present embodiment is obtained by omitting the second bathtub 7, the second bath hot water supply pipe 56, and the second bath heating pipe 57 from the hot water heater 100A (see FIG. 1) of the first embodiment. . Such a water heater 100D is particularly suitable for a two-family house where there is one bath but two kitchens. By simplifying, individual temperature hot water supply from a plurality of locations is possible while reducing the product cost, which is highly convenient for the user.

  Regarding the way of sharing the piping in the upper part of the hot water storage tank 2, the hot water heater 100D of this embodiment shares the idea with the hot water heater 100A of the first embodiment. That is, the hot water heater 100D (the hot water storage tank unit 1D) includes a hot water outlet piping 12 connected to the upper portion of the hot water storage tank 2 and a hot water outlet piping 12 connected to the upper portion of the hot water storage tank 2 separately from the hot water outlet piping 12. And a pipe 13. The hot water supply hot water supply pipe 12 is shared as a part of each of the first hot water supply pipe 52 and the second hot water supply pipe 55, and the bath hot water supply pipe 13 is connected to each of the bath hot water supply pipe 53 and the bath heating pipe 54. Shared as part. With such a configuration, the benefits described in the first embodiment can be obtained.

(Fifth embodiment)
FIG. 5 is a configuration diagram of a water heater according to the fifth embodiment. The hot water heater 100E of the present embodiment is obtained by omitting the second bathtub 7, the second bath hot water supply pipe 56, and the second bath heating pipe 57 from the hot water heater 100B of the second embodiment (see FIG. 2). . The difference between the water heater 100E of the present embodiment and the water heater 100D of the fourth embodiment (see FIG. 4) is in the way of sharing piping in the upper part of the hot water storage tank 2.

  The hot water heater 100E (hot water storage tank unit 1E) includes a first hot water supply pipe 64 connected to the upper part of the hot water storage tank 2 and a second hot water supply pipe 65 connected to the upper part of the hot water storage tank 2 separately from the first hot water supply pipe 64. And. The first hot water supply pipe 64 is shared as a part of each of the first hot water supply pipe 52, the bath hot water supply pipe 53, and the bath heating pipe 54, and the second hot water supply pipe 65 is a part of the second hot water supply pipe 55. It is used as. With such a configuration, the benefits described in the second embodiment can be obtained.

  As described in the third embodiment (FIG. 3), a dedicated hot water supply pipe may be provided in the first hot water supply pipe 52. That is, a dedicated hot water supply pipe for the first hot water supply pipe 52, a dedicated hot water supply pipe for the second hot water supply pipe 55, and a hot water supply pipe shared by the bath hot water supply pipe 53 and the bath heating pipe 54 are connected to the hot water storage tank 2. Can be connected to the top of the.

  In the embodiment described above, the heat pump unit 3 using carbon dioxide as a refrigerant is employed as the water heating device, but other refrigerants such as alternative chlorofluorocarbon and ammonia may be used. However, using carbon dioxide makes it possible to produce hot water with high efficiency and is also friendly to the global environment. Moreover, you may use an electric heater and a gas combustion apparatus as a water heating apparatus.

The block diagram of the hot water storage type water heater concerning 1st Embodiment of this invention. Schematic diagram of a hot water storage type water heater according to the second embodiment The block diagram of the hot water storage type water heater concerning 3rd Embodiment Schematic diagram of a hot water storage type water heater according to the fourth embodiment. Schematic diagram of a hot water storage type water heater according to the fifth embodiment Configuration diagram of a conventional hot water storage water heater

Explanation of symbols

1A, 1B, 1C, 1D, 1E Hot water storage tank unit 2 Hot water storage tank 3 Heat pump unit 4 First hot water supply terminal 5 Second hot water supply terminal 6 First bathtub 7 Second bathtub 8 First hot water control terminal 9 Second hot water control terminal 10 1 bath control terminal 11 2nd bath control terminal 12 hot water outlet piping 13 bath outlet piping 14 water supply line 15 pressure reducing valve 17 first hot water mixing valve 18 second hot water mixing valve 19 first bath mixing valve 20 second bath mixing Valve 31 1st bath heat exchanger 32 2nd bath heat exchanger 46 Water supply pressurization pump 52 1st hot water supply line 53 1st hot water supply line 54 1st bath heating line 55 2nd hot water supply line 56 2nd bath Hot water supply pipe 57 Second bath heating pipes 62, 64 First hot water supply pipes 63, 65 Second hot water supply pipes 100A, 100B, 100C, 100D, 100E

Claims (4)

A heating device for heating water;
A hot water storage tank for storing hot water heated by the heating device;
A first hot water supply line for mixing hot water and hot water in the hot water storage tank in a first hot water mixing valve and supplying hot water adjusted to a predetermined first hot water temperature to a first hot water terminal such as a faucet or shower;
First hot water supply temperature setting means for setting the first hot water supply temperature used for controlling the first hot water supply mixing valve based on an input made by a user of the first hot water supply terminal;
A first bath hot water supply line that mixes hot water and hot water in the hot water storage tank in a first bath mixing valve and supplies hot water adjusted to a predetermined first bath hot water temperature to the first bathtub;
First bath temperature setting means for setting the first bath hot water temperature used for controlling the first bath mixing valve based on an input performed by a user of the first bathtub;
A second hot water supply line for mixing hot water and hot water in the hot water storage tank in a second hot water supply mixing valve, and supplying hot water adjusted to a predetermined second hot water supply temperature to a second hot water supply terminal such as a faucet or shower;
Second hot water supply temperature setting means for setting the second hot water supply temperature used for controlling the second hot water supply mixing valve based on an input made by a user of the second hot water supply terminal;
A second bath hot water supply line for mixing the hot water in the hot water storage tank and the hot water in a second bath mixing valve and supplying hot water adjusted to a predetermined second bath hot water temperature to the second bathtub;
A second bath temperature setting means for setting the second bath hot water temperature used for controlling the second bath mixing valve based on an input performed by a user of the second bathtub;
A first hot water supply pipe connected to the upper part of the hot water storage tank; and a second hot water supply pipe connected to the upper part of the hot water storage tank separately from the first hot water supply pipe;
The first hot water supply pipe is shared as a part of each of the first hot water supply pipe and the first bath hot water supply pipe;
The hot water storage type hot water heater in which the second hot water supply pipe is shared as a part of each of the second hot water supply pipe and the second bath hot water supply pipe. A first bath heating line for heat-exchanging water or hot water in the first bathtub with hot water in the hot water storage tank to heat to a predetermined first bath temperature;
A second bath heating line that heats the water or hot water in the second bathtub with the hot water in the hot water storage tank and heats it to a predetermined second bath temperature;
The first hot water piping is used as a part of the first bath heating pipe;
The hot water storage type hot water supply apparatus according to claim 1, wherein the second hot water supply pipe is used as a part of the second bath heating pipe line. The first bath temperature setting means is based on an input made by a user of the first bathtub, and the first bath temperature used for controlling the first bath hot water temperature and heat exchange in the first bath heating pipeline. And set
The second bath temperature setting means is configured to control the second bath hot water temperature and the second bath temperature used for heat exchange control in the second bath heating pipeline based on an input performed by a user of the second bathtub. The hot water storage type water heater according to claim 2, wherein A water supply pipe for replenishing water at the lower part of the hot water storage tank;
The water supply line includes a pressure reducing valve that determines the hot water supply pressure of each hot water supply line, and a water supply pressurization that is disposed upstream and / or downstream of the hot water storage tank with respect to the flow direction of water relative to the pressure reducing valve. The hot water storage type hot water supply device according to any one of claims 1 to 3 , comprising a pump.

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