JP4877580B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus that can be used in a heat pump hot water supply system or the like.

2. Description of the Related Art Conventionally, heat pump hot water supply systems that store hot water in a hot water storage tank by driving a heat pump with CO ₂ refrigerant or the like at night when the utility cost is low, and use this for general hot water or bath hot water are widely known. . In general, the hot water storage tank has a cylindrical structure having a pressure-resistant structure, but the cylindrical structure has a large restriction on the installation space, and there is a problem that it cannot be set depending on circumstances in a narrow area. Moreover, regarding hot water supply to the bathtub, it is necessary to provide mechanical parts such as an edge cut-off valve so that bath hot water and clean water are not mixed, and there is a problem that the configuration becomes complicated.

On the other hand, as a hot water storage tank, for example, Patent Document 1 or 2 discloses a technique using an open tank in which water pressure does not directly act on the hot water storage tank. If such an open-type tank is used, the tank can be configured in a free shape according to the installation location, but in this case it cannot be used as clean water, so it is inconvenient for general hot water supply Have a problem.
JP 58-26939 A Japanese Patent No. 2916655

  An object of the present invention is to provide a hot water storage type hot water supply apparatus that can efficiently supply hot water to a general hot water bath and a bathtub while adopting an open type hot water storage tank so that the hot water storage tank can be installed in a limited installation space. It is.

  In order to achieve the above object, the present invention takes the following technical means.

That is, the present invention relates to a hot water storage hot water supply apparatus having a hot water storage tank that stores heat by storing heated high-temperature water, wherein the hot water storage tank is an open tank whose internal space is open to the atmosphere. A hot water supply pipe for supplying hot water to the bathtub, a heat exchanger for exchanging heat between the high temperature water taken out from the hot water storage tank and the low temperature water supplied from water supply means such as a water supply, and the low temperature water by the heat exchanger And a hot water supply pipe for supplying hot water that is heated, and the bathtub hot water supply pipe is provided with a pump for filling the bathtub with hot water, and the pump is also used for circulating hot water in the bathtub. is characterized in that there (claim 1). According to the present invention, since an open type hot water storage tank is employed, the degree of freedom of the shape and structure of the tank is increased, and a hot water storage tank having a sufficient capacity can be installed even in a narrow area. Moreover, by supplying hot water in the hot water storage tank to the bathtub through the bathtub hot water supply pipe, it can be effectively used for bath hot water filling, and hot water filling with good thermal efficiency can be performed. Furthermore, general hot water supply can also be performed conveniently by heating the low temperature water supplied from a water supply means using the high temperature water of the hot water storage tank upper part. In addition, it is possible to adopt a configuration in which water supply pressure is used to perform general hot water supply. By performing general hot water supply without using a pressure reducing valve, it is possible to increase the hot water supply pressure of general hot water with a simple configuration. it can. In the present invention, the hot water storage tank is not limited to one in which the pressure larger than the atmospheric pressure such as tap water does not act directly, and the water storage space is not directly open to the atmosphere, It may be indirectly opened to the atmosphere by connecting to another water storage tank or the like opened to the atmosphere.

According to this, since it becomes possible to supply water to a pump as needed, it is not necessary to use a self-priming pump, and the structure can be further simplified.

According to this, the hot water circulation in a bathtub and the hot water supply to a bathtub can be performed with one pump, and the simplification of a structure and cost reduction can be achieved further. Furthermore, when hot water circulation in the bathtub is started and the circulating water volume cannot be detected by the water volume sensor in spite of the circulation operation, hot water from the hot water storage tank is called so-called priming water by opening the solenoid valve for a certain period of time. It is also possible to control to supply to the pump, and the hot water circulation in the bathtub can be started without using a self-priming pump, and the structure can be further simplified.

  In the hot water storage type hot water supply apparatus of the present invention, a partition for preventing mixing of low temperature water supplied to the hot water storage tank from above and hot water stored in the hot water storage tank is provided in the hot water storage tank, and the two water storage spaces partitioned by the partition are provided. Is communicated at the bottom of the hot water storage tank, and the bathtub hot water supply pipe is provided with a mixing section that mixes the low temperature water extracted from the hot water storage tank and the high temperature water to produce hot water of a predetermined temperature. (Claim 2). According to this, while having a configuration in which low-temperature water is supplied from the top of the open-type hot water storage tank by dropping it, the low-temperature water supply space and the hot-water storage space in which the high-temperature water is stored are partitioned by the partition. Therefore, it is not necessary to provide a so-called edge cut-off valve, and bath water can be supplied with a simple configuration. In addition, high temperature water can be taken out from the upper layer of the hot water storage space, and low temperature water can be taken out from the lower layer of the hot water storage space or the above-mentioned low temperature water supply space. The hot water having the desired temperature that has been set can be supplied to the bathtub by mixing with a predetermined temperature.

  Moreover, the heat exchanger which heats the hot water in a bathtub by exchanging heat between the high temperature water in a hot water storage tank and the hot water in a bathtub can be provided (Claim 3). According to this, the hot water in the hot water stored in the hot water storage space of the hot water storage tank can be effectively used to replenish the hot water in the bathtub. The hot water in the hot water tank may be taken out of the hot water tank and the hot water in the bathtub may be taken out of the bathtub to exchange heat, or the hot water in the hot water tank may be exchanged. Alternatively, the hot water in the hot water storage tank may be sent to the bathtub and heat exchanged in the bathtub.

  Furthermore, it can be set as the structure which can supply the high temperature water in a hot water storage tank to a load terminal (Claim 4). Here, the load terminal includes all terminals that require thermal energy, such as underfloor heating, an air conditioner, and a fan convector. When the hot water storage tank is open as described above, there is a high possibility that it is difficult to use the high-temperature water present in the hot water storage tank as it is for hot water supply, but it is directly connected to a load terminal such as a heater without using a heat exchanger or the like. Can be supplied automatically. Therefore, according to the above-described configuration, the hot water stored in the hot water storage space can be effectively used for the operation of the load terminal such as heating.

Moreover, the said pump shall be arrange | positioned below the said hot water storage tank (Claim 5).

In the present invention, although it is preferable to use a heat pump as a heat source for heating the hot water in the hot water tank, such as cogeneration systems and gas burner heating device, it may be employed any heat source. Preferably, the present invention can be implemented in a hot water supply apparatus having a heating circulation channel that takes out low-temperature water from the lower layer of the hot water storage tank, heats it with a heat source, and returns it to the upper layer of the tank. It may be a hot water supply apparatus configured to heat the low-temperature water supplied from the water supply means without using a heat source and store it in the tank.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an overall schematic view of a hot water storage type heat pump hot water supply device 1 according to a first embodiment of the present invention, and the hot water supply device 1 includes a hot water storage tank 2 for storing hot water and a heat source 3 such as a heat pump unit. ing. The hot water storage tank 2 and the heat source 3 connect the low temperature water extraction pipe 4 provided at the bottom of the hot water storage tank 2, the forward pipe 5 that connects the extraction pipe 4 and the heat source 3, and the heat source 3 and the upper part of the hot water storage tank 2. Are connected by a circulation flow path formed by the return pipe 6. A circulation pump 7 for circulating hot water is provided in the middle of the forward pipe 5.

  The hot water storage tank 2 is opened to the atmosphere through a vent 8 provided in the upper portion thereof, and the internal pressure is set to atmospheric pressure. Therefore, the degree of freedom in designing the tank structure is large, and the tank structure can be configured as a thin tank that can be installed in a narrow space.

  A water storage space inside the hot water storage tank 2 is divided into two by a partition plate 9, one of which is a small capacity water supply space a to which low temperature water from a water supply means 10 such as a water supply is supplied, and the other is a heat source. 3 is a large-capacity hot water storage space b in which high-temperature water heated by 3 is stored. The partition plate 9 prevents the low temperature water in the water supply space a and the high temperature water in the hot water storage space b from mixing, so that the low temperature water is dropped into the atmosphere open type tank 2 from above. Can be stored efficiently. The hot water in the hot water storage space b becomes higher as it reaches the upper layer side and becomes lower as it reaches the lower layer side. Therefore, by connecting the water supply space a and the hot water storage space b at the bottom of the tank 2 as shown in the drawing, while allowing the water to flow between the water supply space a and the hot water storage space b, the high temperature on the upper layer side. It prevents the water temperature from dropping.

  A low temperature water supply port 11a through which low temperature water flows out from a water supply pipe 11 connected to the water supply means 10 is formed above the water supply space a. In order to keep the water level in the tank 2 constant, the low temperature water supply port 11 is provided with a water supply device such as a ball tap 12.

  Moreover, the hot water supply device 1 of the present embodiment includes a bathtub hot water supply pipe 13 that supplies hot water in the hot water storage tank 2 to the bathtub, high temperature water extracted from the hot water storage tank 2, and low temperature water supplied from the water supply means 10. General hot water supply heat exchanger 14 for heat exchange, general hot water supply pipe 15 for supplying hot water obtained by heating low temperature water from water supply means 10 with the heat exchanger, high temperature water in hot water storage tank 2 and bathtub B Reheating heat exchanger 16 that heats hot water in bathtub B by exchanging heat with hot water, and a heating circulation channel that can circulate hot water between hot water storage tank 2 and heating terminal 17 30. In the illustrated embodiment, the general hot water supply heat exchanger 14 and the reheating heat exchanger 16 are integrally configured, but may be configured separately.

  The bathtub hot water supply pipe 13 supplies hot water of a predetermined temperature generated by mixing hot water extracted from the upper layer of the hot water storage space b of the hot water storage tank 2 and low temperature water extracted from the lower layer of the water supply space a to the bathtub B. A high-temperature water take-out pipe 18 that has one end opening in the upper layer of the hot water storage space b, the low-temperature water take-out pipe 4, and a bathtub hot-water supply pipe 19 connected to the bathtub are mixed with a mixing valve 20. It is set as the structure connected by (mixing part). It should be noted that the opening of the hot water outlet pipe 18 into the hot water storage tank 2 only needs to be arranged at a location where the hot water temperature to be supplied can be obtained. It can also be opened to an intermediate position or a lower layer side than the middle.

  A pump 21 for performing hot water filling by sending hot water to the bathtub B is provided in the middle of the bathtub hot water supply pipe 19, and a water level sensor 22 for detecting the bathtub water level downstream of the pump 21. Is provided. An electromagnetic opening / closing valve 23 is provided between the mixing valve 20 and the pump 21, and the hot water supply from the hot water storage tank 2 to the bathtub B can be stopped by closing the electromagnetic opening / closing valve 23. The mixing valve 20 can be constituted by an electromagnetic control valve that can control the opening degree of each of the pipes 4, 18, and 19, and by adjusting the opening amount of the low temperature water extraction pipe 4 and the opening amount of the high temperature water extraction pipe 18, It is possible to generate hot and cold water at a set temperature. The pump 21 is disposed below the hot water storage tank 2 so that priming water can be provided to the pump 21 by the dead weight of the hot water in the hot water storage tank 2. A water temperature sensor is preferably provided in the middle of the bathtub hot water supply pipe 19.

  The general hot water supply heat exchanger 14 is provided in the middle of the high temperature water circulation passage 24 that takes out high temperature water from the upper layer of the hot water storage space b of the hot water storage tank 2 and returns it to the bottom of the hot water storage tank 2. The low temperature water is heated by indirect heat exchange between the high temperature water flowing through the high temperature water circulation passage 24 and the low temperature water supplied from the water supply means 10, and the heated hot water is used as a general hot water supply pipe. 15 is supplied. Further, the general hot water supply pipe 15 and the water supply pipe 11 are connected by a bypass pipe 25, and hot water heated by the heat exchanger 14 and a bypass pipe are connected to a connecting portion between the bypass pipe 25 and the general hot water supply pipe 15. A mixing valve 26 is provided for mixing the low-temperature water supplied from the water supply means 10 through 25 to generate hot water having a predetermined temperature. A pump 29 for circulating the high temperature water is provided in the middle of the high temperature water circulation channel 24 (on the downstream side of the heat exchanger 14 in the illustrated embodiment).

  The general hot water supply pipe 15 mixes hot water heated by the heat exchanger 14 with low-temperature water supplied from the water supply means 10 as necessary, and is used in a room or other appropriate place for drinking hot water or other purposes. Supply.

  The reheating heat exchanger 16 is provided in the middle of the high-temperature water circulation passage 24 and the recirculation circulation passage 28 that takes out hot water from the bathtub B and returns it to the bathtub. The bath water is heated by exchanging heat between the hot water in the hot water storage tank 2 flowing through the hot water and the hot water in the bath. In the illustrated embodiment, a pipe line 28 a on the downstream side of the heat exchanger 16 constituting the recirculation circulation path 28 is connected between the electromagnetic open / close valve 23 of the bathtub hot water supply pipe 19 and the pump 21. The pipe 19a leading to the bathtub and the pump 21 are shared by the bathtub hot water supply pipe 19 and the recirculation circulation path 28.

  The heating circulation channel 30 is a channel connected to the heating terminal 17, and in the state connected to the heating terminal 17, the hot water is taken out from the upper layer portion of the hot water storage space b of the hot water storage tank 2 and supplied to the heating terminal 17. Then, the flow path can be returned to the bottom of the hot water storage tank 2. That is, in this embodiment, the hot water in the hot water storage tank 2 functions as a heat medium, and heat energy can be supplied to the heating terminal 17 through the high temperature water in the hot water storage tank 2. A pump 31 for circulating high temperature water is provided in the middle of the high temperature water circulation passage 30.

  FIG. 2 shows a hot water storage type heat pump water heater according to a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted. explain.

  In this embodiment, the hot water storage tank 2 is not provided with a partition plate, and a water supply tank 40 separate from the hot water storage tank 2 is disposed above the hot water storage tank 2. The low-temperature water supplied from is heated by the heat source 3 and stored in the hot water storage tank 2. Further, the water supply pipe 11 of the water supply means 10 extends to the water supply tank 40, and low temperature water flows out from the top of the water supply tank 40. The water supply tank 40 is opened to the atmosphere by a vent 41 and a constant water level is maintained by a water supply device such as a ball tap 42.

  A branch pipe 4 a is provided in the middle of the low-temperature water take-out pipe 4, and the branch pipe 4 a is connected to the bottom of the hot water storage tank 2. As a result, the hot water storage space in the hot water storage tank 2 is connected to the internal space of the water supply tank 40 via the low temperature water take-out pipe 4, and the space in the hot water storage tank 2 is indirectly opened to the atmosphere. A check valve for preventing the outflow of water from the hot water storage tank 2 may be provided in the middle of the branch pipe 4a.

  In the hot water supply apparatus of this embodiment, when hot water in the hot water storage tank 2 is used, low temperature water can be replenished from the water supply tank 40 via the branch pipe 4a.

  The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate. For example, in the above embodiment, the high temperature water in the hot water storage tank 2 is directly supplied to the heating terminal 17, but the high temperature water taken out from the hot water storage tank 2 and the heat medium supplied to the heating terminal 17 exchange heat. It is good also as a structure which provided the possible heat exchanger. That is, the heat medium supplied to the heating terminal 17 may be configured to be indirectly heated by the high-temperature water taken out from the hot water storage tank 2.

It is a schematic diagram of the hot water storage type heat pump hot-water supply apparatus which concerns on 1st Embodiment of this invention. It is a schematic diagram of the hot water storage type heat pump hot-water supply apparatus which concerns on 2nd Embodiment of this invention.

DESCRIPTION OF SYMBOLS 1 Hot water storage type hot water supply apparatus 2 Hot water storage tank 3 Heat pump unit 9 Partition plate 13 Bath hot water supply pipe 14 General hot water supply heat exchanger 15 General hot water supply pipe 17 Load terminal 20 Mixing valve (mixing part)
21 Pump a Water supply space (water storage space)
b Hot water storage space (water storage space)
B Bathtub

Claims (5)

In a hot water storage hot water supply apparatus having a hot water storage tank for storing heat by storing heated high-temperature water, the hot water storage tank is an open tank whose internal space is open to the atmosphere, and supplies hot water in the hot water storage tank to the bathtub A heat exchanger for exchanging heat between a hot water supply pipe in a bathtub, high temperature water taken out from a hot water storage tank and low temperature water supplied from a water supply means such as a water supply, and hot water obtained by heating low temperature water by the heat exchanger. General hot water supply piping to supply ,
The bathtub hot water supply piping is equipped with a pump to fill the bathtub.
The hot water storage type hot water supply apparatus , wherein the pump is also used for circulating hot water in a bathtub . The hot water storage type hot water supply apparatus according to claim 1, wherein a partition for preventing mixing of the low temperature water supplied to the hot water storage tank from above and the hot water stored in the hot water storage tank is provided in the hot water storage tank, and the two partitions partitioned by the partitions are provided. The water storage space communicates with the bottom of the hot water storage tank, and the bathtub hot water supply piping is provided with a mixing section that mixes the low temperature water extracted from the hot water storage tank with the high temperature water to produce hot water at a predetermined temperature. Hot water storage type hot water supply device characterized by The hot water storage type hot water supply apparatus according to claim 1 or 2, further comprising a heat exchanger that heats the hot water in the bathtub by exchanging heat between the high temperature water in the hot water storage tank and the hot water in the bathtub. Hot water storage water heater. The hot water storage type hot water supply apparatus according to claim 1, 2, or 3, wherein hot water in the hot water storage tank can be supplied to a load terminal. The hot water storage type hot water supply apparatus according to any one of claims 1 to 4, wherein the pump is disposed below the hot water storage tank.

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