JP4882731B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus in which purified water is heated by a heating means and is used for hot water supply, bath hot water filling and the like.

Conventionally, as this type of hot water storage type hot water supply device, there is one in which a purification device is disposed in a hot water storage tank in the same casing, and the purified water is heated and used for hot water supply (for example, Patent Document 1). reference). FIG. 5 is a diagram showing a schematic configuration of a conventional hot water storage type hot water supply apparatus disclosed in Patent Document 1, in which 1 is an exterior housing that encloses a hot water storage tank 2 and a water supply source (not shown). ) And the hot water storage tank 2, the water purifier 3 is interposed, and the purified water in the hot water storage tank 2 is heated by the heater 4 and supplied from the hot water supply circuit 5 to the hot water supply terminal. Since the water purifier 3 can remove hardness components, chlorine components, organic substances, etc. in the water, for example, it prevents contamination of the bathtub (not shown), scale adhesion to hot water supply equipment and currants, and removes the odor of water. I can do it.
Japanese Patent No. 3572707

  However, in the configuration of the conventional hot water storage type hot water supply device, when the water purifier 3 removes hardness components (Ca, Ma, etc.) and chlorine components contained in the water supplied from the water supply source, Since the removed hardness component or chlorine component remains, the performance gradually deteriorates depending on the amount of purified water. Therefore, it is necessary to carry out maintenance for performance recovery including removal of the hardness component and chlorine component remaining in the water purifier 3 or replacement of the water purifier periodically or when purifying a predetermined amount of water. .

  However, in the conventional hot water storage type hot water supply apparatus, the water purifier 3 is incorporated in the same exterior casing 1 of the hot water storage type hot water supply apparatus, and the hardness component and the chlorine component remaining in the water purifier 3 are removed and cleaned, or Since it is not the structure which can perform the maintenance for performance recovery also including replacement | exchange of the water purifier 3, when the performance of the water purifier 3 falls, the exterior housing | casing 1 and the hot water storage tank 2 are removed, and the water purifier 3 is removed. It will be replaced, or the hot water storage type hot water supply main body will be replaced. In other words, the configuration in which the water purifier 3 is incorporated in the same housing of the hot water storage type hot water supply apparatus is not only inferior in maintainability, but also when the amount of water used is large, the hot water storage type hot water supply apparatus can be replaced in a short time. Necessary and cost increased.

  The present invention solves the above-mentioned conventional problems, has a compact water purification function that does not require an installation space for water purification means, and when the performance of the water purification means deteriorates, the water purification means can be easily replaced, or the performance An object of the present invention is to provide an easy-to-use hot water storage type hot water supply apparatus capable of performing maintenance for recovery.

In order to solve the above-described conventional problems, a hot water storage type hot water supply apparatus of the present invention includes a hot water storage tank that is substantially cylindrical and covered with a heat insulating material, an outer casing that houses the hot water storage tank in a substantially rectangular parallelepiped, and a hot water storage tank. A heat dissipating heat exchanger of a heat pump that heats water, and a conveying means that heats the water in the hot water storage tank with the heat dissipating heat exchanger and returns it to the hot water storage tank, and is disposed upstream of the heat dissipating heat exchanger. And a water purifier that is an ion exchange resin disposed between the heat dissipation heat exchanger and the pump, and a space formed between the outer casing and the hot water storage tank. The exterior casing is provided with an opening / closing door in the vicinity of the water purification means, and the performance recovery including cleaning of the water purification means or replacement of the cartridge can be performed in a short time and easily from the opening / closing door provided in the exterior casing. That can be used for maintenance work Because it is, along with user-friendliness is improved, thereby reducing the investment cost of the total for extending the life of the hot water storage type water heater. Furthermore, by installing the water purification means in a dead space between the substantially rectangular parallelepiped outer casing and the substantially cylindrical hot water storage tank, a space for installing the water purification means becomes unnecessary, and a compact hot water storage type hot water supply device can do.

The hot water storage type hot water supply apparatus of the present invention can perform maintenance work for performance recovery including cleaning of the water purification means or replacement of the water purifier from the open / close door provided in the exterior casing, and is therefore easy to use. As well as improving the life of the hot water supply device, the total investment cost can be reduced. Furthermore, since the water purification means is installed using the dead space between the substantially rectangular parallelepiped outer casing and the substantially cylindrical hot water storage tank, a compact hot water storage type hot water supply apparatus that does not require the installation space for the water purification means can be achieved.

According to a first aspect of the present invention, there is provided a hot water storage tank that is substantially cylindrical and covered with a heat insulating material, an exterior housing that houses the hot water storage tank in a substantially rectangular parallelepiped, a heat dissipation heat exchanger for a heat pump that heats water in the hot water storage tank, A transport means for heating the water in the hot water storage tank with the radiant heat exchanger and returning it to the hot water storage tank again, a pump disposed upstream of the radiant heat exchanger, the exterior housing, and the hot water storage tank, And a water purification means that is an ion exchange resin disposed between the heat dissipation heat exchanger and the pump, and is opened and closed near the water purification means of the exterior casing Used with doors, and can be used for maintenance work for performance recovery including cleaning of water purification means or replacement of cartridges in a short time and easily from the open / close door provided on the exterior housing. That will improve the user experience , It is possible to reduce the investment cost of the total for the life of the hot water storage type water heater extends. Furthermore, by installing the water purification means in a dead space between the substantially rectangular parallelepiped outer casing and the substantially cylindrical hot water storage tank, a space for installing the water purification means becomes unnecessary, and a compact hot water storage type hot water supply device can do.

In addition, since the hardness component of the water heated by the heat pump can be suppressed, the scale component adhering to the heat dissipation heat exchanger, hot water supply piping, etc. can be greatly reduced, improving the reliability of the hot water storage type hot water supply device. In addition, the hot water storage type hot water supply apparatus that can handle hot water supply with a large flow rate can be obtained.

In the second invention, in particular, the heat insulating material of the first invention is a vacuum heat insulating material, and it is possible to reduce the size of the hot water supply device or increase the capacity of the hot water storage tank. Moreover, since the capacity of the water purification means can be increased by expanding the dead space, the maintenance cycle of the water purification means can be lengthened .

The third invention uses carbon dioxide as the refrigerant of the heat pump of the first or second invention, operates on the high pressure side in a state exceeding the critical pressure, and can use the hot water storage type hot water supply device at a high temperature, The increase in the heat capacity of the hot water storage tank and the prevention of running out of hot water can be further improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

( Reference Example 1 )
A hot water storage type hot water supply apparatus in a first reference example of the present invention will be described with reference to FIGS. FIG. 1 shows a configuration diagram of a hot water storage type hot water supply apparatus in the present reference example .

In FIG. 1, a substantially cylindrical hot water storage tank 7 covered with a heat insulating material 8 and water supplied to the hot water storage tank 7 are placed in an outer casing 6 of a substantially rectangular parallelepiped of the hot water storage type hot water supply apparatus in this reference example . Water purifying means 12 for purifying, water supply pipes 14 and 15, hot water supply pipe 16, a water pump 10 for conveying water in the hot water storage tank 7 to the heating means 9, and a water circuit 11 communicating the hot water storage tank 7 and the heating means 9. I have. Further, an open / close door 13 is provided in the exterior housing 6 in the vicinity of the water purification means 12.
The water taken out by the water pump 10 from the lower part of the hot water storage tank 7 is heated to a high temperature by the heating means 9 arranged in the middle of the water circuit 11. Thereafter, the hot water heated by the heating means 9 is poured into the upper part of the hot water storage tank 7. At this time, in the hot water storage tank 7, hot hot water is stored in the upper portion and low temperature water is stored in a stacked state in the lower portion.

In addition, water can be heated by making the heating means 9 into a heater or a heat pump. Hot hot water stored in the upper part of the hot water storage tank 7 is appropriately supplied from the hot water supply pipe 16 to a use terminal (such as a currant, a shower, a bathtub, and a heating device), and at the same time, from the lower part of the hot water storage tank 7, Water is supplied through 15. The heat insulating material 8 of the hot water storage tank 7 may be a vacuum heat insulating material or a sheet-shaped heat insulating material. Moreover, you may use the heat insulating material shape | molded, such as a polystyrene foam. The water purification means 12 incorporates removal means such as activated carbon, a hollow fiber membrane filter, and an ion exchange resin, and removes organic substances, hardness components (Ca, Mg), chlorine, and the like contained in the supplied water.

  FIG. 2 is a horizontal cross-sectional view of the hot water storage type hot water supply apparatus, in which a water purifying means 12 is installed in a space portion 6a formed by arranging a substantially cylindrical hot water storage tank 7 in a substantially rectangular parallelepiped casing 6. FIG. 3 is a perspective view of the hot water storage type hot water supply apparatus. An open / close door 13 is provided in the vicinity of the water purification means 12 of the substantially rectangular parallelepiped outer casing 6, and purified water is passed through the open / close door 13 from the outside of the wound casing 6. It is configured to be able to replace the means 12 or perform maintenance work.

Below, operation | movement and an effect | action of the hot water storage type hot-water supply apparatus in this reference example are demonstrated.

Organic substances, hardness components (Ca, Mg), chlorine, and the like contained in the supplied water remain in the removing means (not shown) such as activated carbon, hollow fiber membrane filter, ion exchange resin, etc. of the water purification means 12. As the residual amount increases, the purification performance decreases. Therefore, when the removal means of the water purification means 12 is activated carbon or a hollow fiber membrane filter, replacement of the cartridge or the like, and in the case of an ion exchange resin, a regenerant ( It is necessary to perform regenerative maintenance work by adding salt, etc.). According to this reference example , replacement and maintenance of the removing means of the water purification means 12 can be performed from the open / close door 13 of the exterior housing 6 without removing the exterior housing 6.

  As described above, even if the hot water storage tank 7 and the water purification means 12 are incorporated in the same exterior casing 6, the water purification means 12 can be replaced or maintained through the open / close door 13 without removing the exterior casing 6. Since the work can be performed in a short time, the usability is improved and the life of the hot water storage type hot water supply device is extended, so that the total investment cost can be reduced. Moreover, since the water purification means 12 is installed using the dead space of the substantially rectangular parallelepiped outer housing 6 and the substantially cylindrical hot water storage tank 7, a compact hot water storage type hot water supply that does not require an installation space for the water purification means 12 is provided. Can be equipment.

  Here, the following effects can be acquired by making the heat insulating material 8 into a vacuum heat insulating material. The heat conductivity of the vacuum heat insulating material that makes the inside of the outer case vacuum (1 to 200 Pa) is the heat conductivity of the sheet-like heat insulating material using materials such as glass wool, glass fiber, polyurethane, polyethylene, etc. at the atmospheric pressure inside the outer case. Compared to 1/10 to 1/100. Accordingly, in the hot water storage tank 7 using the vacuum heat insulating material and the hot water storage tank 7 using the sheet-shaped heat insulating material, when the heat radiation from the hot water storage tank 7 is the same, the required thickness of the sheet-shaped heat insulating material is 10 to 100 times the thickness of the vacuum heat insulating material.

  Moreover, since the thickness can be made thin by using the heat insulating material 8 as a vacuum heat insulating material, the apparatus can be made compact. Or when it is set as the same apparatus size, since the hot water storage tank 7 can be enlarged and the amount of remaining hot water of the hot water storage tank 7 becomes difficult to reduce, the hot water outage state which cannot supply hot water can be avoided. Furthermore, since the dead space between the substantially rectangular parallelepiped outer casing 6 and the substantially cylindrical hot water storage tank 7 is expanded, it is possible to provide removal means such as a larger capacity activated carbon, a hollow fiber membrane filter, an ion exchange resin, It is possible to extend the period until replacement / regeneration of the removing means.

( Embodiment 1 )
FIG. 4 shows a configuration diagram of the hot water storage type hot water supply apparatus according to the first embodiment of the present invention. In addition, about the same part as the hot water storage type hot water supply apparatus in the said 1st reference example , the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIG. 4, the present embodiment is a heat pump in which a compressor 17, a radiant heat exchanger 18, an expansion valve 19, and an endothermic heat exchanger 20 are sequentially connected in a ring shape with a refrigerant pipe 21 as heating means. Is used. The water in the hot water storage tank 7 is heated to a high temperature by the heat dissipation heat exchanger 18 and then returned to the upper part of the hot water storage tank 7 again. In FIG. 4, the water purification means 12 is installed in the water circuit 11 on the upstream side of the radiant heat exchanger 18.

  Below, operation | movement and an effect | action of the hot water storage type hot-water supply apparatus by this Embodiment are demonstrated.

  The solubility of the hardness component contained in water decreases with increasing water temperature. Therefore, when water is heated from the high-temperature refrigerant to a temperature equal to or higher than the solubility of the hardness component in the heat dissipation heat exchanger 18, the hardness component is deposited and generated as a scale in the heat dissipation heat exchanger 18. When the amount of scale generation increases, the water flow path of the radiating heat exchanger 18 is closed, so that heating of water becomes impossible. Therefore, in the present embodiment, the water purification means 12 is installed in the water circuit 11 on the upstream side of the radiant heat exchanger 18, so that scale generation inside the radiant heat exchanger 18 can be suppressed.

Even in the configuration of the hot water storage type hot water supply apparatus in the first reference example, since the water in the hot water storage tank 7 is purified, scale generation inside the radiant heat exchanger 18 can be suppressed. When the hot water is supplied from the hot water supply means 12, the water purification means 12 installed between the water supply circuits 14 and 15 causes a pressure loss and reduces the flow of hot water supplied from the hot water supply circuit 16. Therefore, by installing the water purifying means 12 in the water circuit 11 on the upstream side of the heat radiating heat exchanger 18, it is possible to make the specification of a hot water storage type hot water supply apparatus that can cope with a large flow of hot water supply.

  The refrigeration cycle preferably uses carbon dioxide as a refrigerant and is operated at a pressure exceeding the critical pressure. By using carbon dioxide as a refrigerant, the hot water storage type hot water supply device can be used at a high temperature, and the increase in the heat capacity of the hot water storage tank 7 and the prevention of running out of hot water can be further improved.

  As described above, the hot water storage type hot water supply apparatus according to the present invention improves the maintainability of the water purification means in the configuration in which the water purifier is incorporated in the same housing, and uses heating or waste heat sources with a water purification function added. It can also be used for applications such as hot water storage hot water supply devices.

The block diagram of the hot water storage type hot water supply apparatus in the reference example 1 of this invention Horizontal sectional view of the hot water storage system Perspective view of the hot water storage system The block diagram of the hot water storage type hot water supply apparatus in Embodiment 1 of this invention The figure which shows schematic structure of the conventional hot water storage type hot water supply apparatus.

DESCRIPTION OF SYMBOLS 6 Exterior housing 6a Space part 7 Hot water storage tank 8 Heat insulating material 9 Heating means 11 Water circuit 12 Water purification means 13 Opening / closing door 17 Compressor 18 Radiation heat exchanger 19 Expansion valve 20 Endothermic heat exchanger

Claims (3)

Wherein the hot water storage tank covered with a heat insulating material in a substantially cylindrical shape, and the outer housing that houses the hot water storage tank in a substantially rectangular parallelepiped, and radiator heat exchanger of the heat pump for heating water of the hot water storage tank, the water in the hot water storage tank It is formed between the outer casing and the hot water storage tank by a conveying means that is heated by the heat dissipation heat exchanger and returned to the hot water storage tank again, on the upstream side of the heat dissipation heat exchanger. A water purification means that is an ion exchange resin disposed in the space and between the heat dissipation heat exchanger and the pump, and an opening / closing door is provided in the vicinity of the water purification means of the exterior casing. Hot water storage type hot water supply device. The hot water storage type hot water supply apparatus according to claim 1, wherein the heat insulating material is a vacuum heat insulating material. The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein carbon dioxide is used as a refrigerant of the heat pump and the high pressure side is operated in a state exceeding a critical pressure.

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