JP2007303748A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage tank of a water heater having superior workability while reducing investment cost and providing sufficient heat retaining/heat insulating effects. <P>SOLUTION: This water heater comprises the hot water storage tank 12 to which a plurality of pipes 13, 18, 23 are connected and in which the hot water heated by a heating device 4 is stored. At least an upper outer hull of the hot water storage tank 12 is coated with an expandable molding heat insulating material 32, and the remaining outer hull not coated with the expandable molding heat insulating material 32 is coated with a glass wool sheet heat insulating material 34. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water supply device such as a heat pump type hot water supply device or a hot water storage type electric water heater using carbon dioxide or the like as a refrigerant, and more particularly to a heat insulation structure of a hot water storage tank.

Conventionally, in this type of hot water supply apparatus, in order to keep the hot water storage tank warm and to insulate, a surface heat insulating material such as glass wool is wound around the outer surface of the hot water storage tank (for example, see Patent Document 1) And the thing (for example, refer patent document 2) of the structure which covers the whole outer side of a hot water storage tank using the foaming shaping | molding heat insulating material dividedly formed by four front and back is known.
JP-A-7-243705 JP 2002-310511 A

  In the heat insulation structure of the hot water storage tank described in the above-mentioned Patent Document 1, there is a problem that the heat dissipation loss at the upper part of the hot water storage tank, which is a high-temperature part, becomes large, and in the heat insulation structure of the hot water storage tank described in Patent Document 1, Therefore, there is a problem that a large mold for forming the foamable molded heat insulating material is required and the investment cost increases.

  The present invention has been made in view of the above circumstances, and is capable of providing a hot water storage tank of a hot water supply apparatus that is excellent in workability and that has a sufficient heat insulation and heat insulation effect while suppressing investment costs. It is an object.

  In the invention according to claim 1, in the hot water supply apparatus having a hot water storage tank to which a plurality of pipes are connected and which stores the hot water heated by the heating apparatus, the hot water storage tank has at least an outer shell made of a foamable heat insulating material. In addition to being covered, the remaining outer shell not covered with the foamable heat insulating material is covered with a planar heat insulating material made of glass wool.

  In the invention according to claim 2, in the hot water supply apparatus having a hot water storage tank connected to a plurality of pipes and storing hot water heated by the heating device, the outer shell of the upper and lower portions of the hot water storage tank has foaming and heat insulation, respectively. In addition to being covered with a material, the remaining outer shell not covered with the foamable heat insulating material is covered with a planar heat insulating material made of glass wool.

  According to a third aspect of the present invention, in the hot water supply apparatus according to the first or second aspect, the glass wool is stored in a bag body of a soft resin sheet in the planar heat insulating material made of glass wool.

  According to a fourth aspect of the present invention, in the hot water supply apparatus according to the first or second aspect, a reflective film is attached to the planar heat insulating material made of glass wool.

  According to the present invention, the upper part of the hot water storage tank in which hot water is always stored is covered with the molded foamed heat insulating material, and the middle part of the hot water storage tank is covered with the surface heat insulating material made of glass wool by winding. Because of the structure, heat dissipation loss at the top of the hot water storage tank, which is a high temperature part, is suppressed by mold-molding foam heat insulating material with excellent heat insulation and heat insulation, and while maintaining the heat insulation and heat insulation of the hot water storage tank, It is possible to reduce the coverage area of foamable molded insulation and the number of foamed molded insulation used, and it is possible to reduce the investment cost, while maintaining excellent workability and sufficient heat insulation and insulation effects. A hot water storage tank can be provided.

  The present invention is connected to a plurality of pipes for the purpose of providing a hot water storage tank of a hot water supply device that is excellent in workability and can provide sufficient heat insulation and heat insulation effects while suppressing investment costs as much as possible. In a hot water supply apparatus having a hot water storage tank for storing hot water heated by a heating apparatus, the hot water storage tank is covered with at least an upper outer shell with a foamable molded heat insulating material and also with the foamable molded heat insulating material. An embodiment of the present invention will be described below with a configuration in which no remaining outer shell is covered with a planar heat insulating material made of glass wool.

  Next, an embodiment of the hot water supply apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is an explanatory diagram for explaining an installed state of a hot water supply apparatus according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of the overall configuration, FIG. 3 is a perspective view of a hot water storage tank with a heat insulating structure, FIG. FIG. 5 is a longitudinal sectional view of a hot water storage tank with a heat insulating structure, and FIG. 5 is an enlarged sectional view of a main part.

  In FIG. 1, a heat pump type hot water supply apparatus A is composed of a heat pump unit 1 and a hot water storage tank unit 2 connected by piping to the heat pump unit 1, and the heat pump unit 1 and the hot water storage tank unit 2 are usually outdoors. Installed. The heat pump unit 1 and the hot water storage tank unit 2 may be integrated into a common exterior case.

  Next, referring to FIG. 2, the heat pump unit 1 includes an outer case 1A, a variable capacity compressor 3 such as a rotary two-stage compressor, a radiator 4A, a decompression device 5 such as an electric expansion valve, An evaporator 6, an accumulator 7, a heat pump side control device 8, a heat exchanging fan 9 that ventilates the evaporator 6 and exchanges heat with air, a heat receiver 4B that exchanges heat with the radiator 4A, and the like are accommodated. The compressor 3, the radiator 4 </ b> A, the decompressor 5, the evaporator 6, and the accumulator 7 are connected in a ring shape by a refrigerant pipe 10, and are compressed to supercritical pressure by the compressor 3 using carbon dioxide as a refrigerant. A heat pump cycle X is configured. The radiator 4A and the heat receiver 4B are integrated with each other to constitute a refrigerant-to-water heat exchanger 4 as a heating device.

  The hot water storage tank unit 2 has a vertically long hot water storage tank 12 made of a stainless steel plate, a water supply pipe 13, a water supply on / off valve 14, a branch water supply pipe 15, a hot water storage pipe 16, a hot water circulation pump 17, in a tank side outer case 2A. Reheating pipe 18, reheating heat exchanger 19, bath water pipe 20, bath water circulation pump 21, reheating circulation pump 22, hot water supply pipe 23, mixing valve device 24, bath hot water on / off valve 25, The tank side control device 26 and the like are accommodated.

  The outlet 16A of the water supply pipe 13 and the hot water storage pipe 16 is connected to the bottom of the hot water storage tank 12, and the inlet part 16B of the hot water storage pipe 16, the outlet part 18A of the reheating pipe 18 and the hot water supply pipe 23 are respectively described above. It is connected to the top of the hot water storage tank 12.

  27 is a communication line for wiring connection between the heat pump side control device 8 and the tank side control device 26, 28 is a kitchen remote controller, 29 is a bath remote controller, and these remote controllers 28 and 29 are tank side control devices. 26 is connected by wiring. 30 indicates a bath.

  Here, when a faucet (not shown) installed in the kitchen or the like is opened, the hot water in the upper part of the hot water storage tank 12 is pushed out to the hot water supply pipe 23 by water pressure, and at the same time as hot water is supplied, Tap water is supplied to the lower part in 12 from a water pipe 13 connected to the bottom.

  When filling the bath 30 with hot water, if a bath hot water switch (not shown) of the remote controller 29 for bath is pressed, hot water pushed out from the upper part of the hot water storage tank 12 to the hot water supply pipe 23 is heated. It flows to the mixing valve device 24, where it is mixed with water supplied from the branch water supply pipe 15, hot water having a preset temperature is poured into the bath 30, and when a predetermined amount of hot water is poured, Complete. Even when the bath 30 is filled, tap water is supplied to the lower part of the hot water storage tank 12 from the water pipe 13 connected to the bottom at the same time as the start of the filling operation.

  As described above, when hot water is supplied to a use section such as the kitchen or the bath 30, the hot water in the hot water storage tank 12 is consumed, and the hot water layer in the hot water storage tank 12 is reduced. Is stored only in the upper part of the hot water storage tank 12, and the intermediate part and the lower part of the hot water storage tank 12 are in a state where hot water or water having a low temperature is stored.

  Next, hot water boiling operation will be described. When the compressor 3 of the heat pump cycle X is started by starting the operation of the heat pump unit 1, the carbon dioxide refrigerant is compressed in two stages by the compressor 3, and is compressed and discharged by the compressor 3. The liquid refrigerant radiates heat with the radiator 4A, exchanges heat with water flowing through the heat receiver 4B, and heats the water.

  The refrigerant whose temperature has been reduced by releasing heat from the radiator 4A is reduced in pressure by the decompression device 5 and becomes low pressure, and then flows into the evaporator 6 and is evaporated by absorbing heat from the air in the evaporator 6. It becomes a gaseous refrigerant, flows into the accumulator 7, is sucked into the compressor 3 from the accumulator 7, and is compressed again.

  With the start of operation of the heat pump unit 1, the hot water circulation pump 17 in the hot water storage tank unit 2 is activated, and the operation of the circulation pump 17 causes the low or normal temperature water in the lower part of the hot water storage tank 12 to be used for hot water storage. It flows into the hot water storage pipe 16 from the outlet 16A of the pipe 16, flows into the heat receiver 4B through the hot water circulation pump 17, and is heated by exchanging heat with the high-temperature and high-pressure refrigerant flowing through the radiator 4A. . And the hot water heated by this heat receiver 4B flows into the upper part of the hot water storage tank 12 from the said inlet part 16B, and 80 degreeC or more is contained in the hot water storage tank 12 with progress of the time of boiling operation. When the hot water storage amount gradually increases and the hot water layer reaches the lower part of the hot water storage tank 12, the boiling operation is completed.

  Next, the heat insulation structure of the hot water storage tank 12 will be described with reference to FIGS. The hot water storage tank 12 has an upper outer shell covered with an upper foamable heat insulating material 32, while a lower outer shell is covered with a lower foamable heat insulating material 33. The hot water storage tank 12 is made of glass wool sheet heat insulation in which the outer portion of the remaining portion that is not covered by the upper and lower foamable heat insulating materials 32 and 33, that is, the outer portion of the intermediate portion is wound around the intermediate portion. It is covered with a material 34. Reference numerals 35 and 35 denote a plurality of support legs provided at the lower part of the hot water storage tank 12.

  The upper and lower foamable heat-insulating materials 32 and 33 are formed by molding heat-resistant foamed polystyrene with a molding die, and the recessed portions 32B having a shape matching the outer and upper outlines of the hot water storage tank 12 are provided. 33B is provided, and the upper part and the lower part of the hot water storage tank 12 are fitted to the depressions 32B and 33B, and the hot water storage tank 12 is attached.

  The upper foaming molded heat insulating material 32 is formed with a lead-out opening 32A through which pipes such as the hot water supply pipe 16 and the reheating pipe 18 connected to the top of the hot water storage tank 12 are led out. In the state where the piping is led out to the opening 32A, a gap pad 36 for closing the leading opening 32A is fitted and mounted.

  As shown in FIG. 3, the planar heat insulating material 34 is wrapped around the hot water storage tank 12 and then held in a wound state using fasteners 37, 37 such as a metal wire. Further, as shown in FIG. 5, the planar heat insulating material 34 includes a glass wool material 34A accommodated in a bag body 34B of a soft resin sheet, which suppresses harmful effects caused by glass wool on the operator and facilitates handling. As the soft resin sheet, a heat resistant polystyrene sheet or the like is used.

  Further, a reflective film 38 is attached to the planar heat insulating material 34. The reflective film 38 is formed of an aluminum vapor deposition sheet, and is attached to substantially the entire surface of the bag body 34B to reflect the radiant heat from the hot water storage tank 12 to the hot water storage tank 12 side, thereby further improving heat insulation and heat insulation. It is increasing.

  According to the above-described embodiment, a plurality of pipes including the water supply pipe 13, the hot water storage pipe 16, the reheating pipe 18 and the hot water supply pipe 23 are connected, and the refrigerant-to-water heat exchanger of the heat pump cycle X as a heating device is connected. In the heat pump type hot water supply apparatus A having the hot water storage tank 12 for storing the hot water heated in 4, the upper and lower outer shells of the hot water storage tank 12 are covered by the upper and lower foamable heat insulating materials 32 and 33, respectively. The upper and lower foamed heat insulating materials 32 and 33 are not covered by the remaining outer shell and are covered with a glass wool sheet heat insulating material 34, so that the temperature is always 80 ° C. or higher. The upper part of the hot water storage tank 12 in which hot water is stored is covered with a molded upper foaming heat insulating material 32, and the intermediate part of the hot water storage tank 12 is glass wool. Therefore, the heat dissipation loss at the upper part of the hot water storage tank 12, which is a high temperature part, is suppressed by the mold-formed upper foaming heat insulating material 32 having excellent heat insulation and heat insulation properties. The heat dissipation loss in the middle portion of the heat sink 12 is suppressed by the planar heat insulating material 34, while maintaining the heat insulation and heat insulating properties of the hot water storage tank 12, the tank covering area of the foamable heat insulating material by molding can be halved and the foaming property can be reduced. The number of molded insulation materials can be halved, and the mold of foamable insulation materials can be reduced in size and the number of sets can be reduced. -It can be used as a hot water storage tank for a hot water supply device that can provide heat insulation.

  Further, since the glass wool material 34A is accommodated in the soft resin sheet bag 34B, the glass wool sheet-like heat insulating material 34 suppresses harmful effects such as scabs and tingling to the worker due to glass wool, and is attached at the time of installation work. Can be improved.

  Further, since the glass wool sheet heat insulating material 34 is provided with a reflective film 38 of an aluminum vapor deposition sheet, the reflective film 38 reflects the radiant heat from the hot water storage tank 12 to the hot water storage tank 12 side to keep the heat insulation.・ The heat insulation can be further enhanced.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the various alternatives and modifications described above without departing from the spirit of the present invention. Or a modification is included.

It is explanatory drawing explaining the installation state of the hot water supply apparatus which shows one Example of this invention. It is a schematic block diagram of the whole structure similarly. It is a perspective view of the hot water storage tank of the state which gave the heat insulation structure similarly. It is the longitudinal cross-sectional view of the hot water storage tank of the state which gave the heat insulation structure similarly. It is a principal part expanded sectional view similarly.

Explanation of symbols

A Hot water supply device X Heat pump cycle 1 Heat pump unit 2 Hot water storage tank unit 3 Compressor 4 Refrigerant to water heat exchanger (heating device)
12 Hot water storage tank 13 Water supply piping (piping)
16 Hot water storage piping (piping)
18 Piping pipe (piping)
23 Hot water supply piping (piping)
32 Upper foaming insulation (foaming insulation)
33 Lower foaming insulation (foaming insulation)
34 Surface insulation material 34A Glass wool material 34B Bag body 37 Fastening tool 38 Reflective film

Claims (4)

In the hot water supply apparatus having a hot water storage tank connected to a plurality of pipes and storing hot water heated by the heating apparatus, the hot water storage tank has at least an outer shell coated with a foamable heat insulating material, A hot water supply apparatus characterized in that a remaining outer shell not covered with a molded heat insulating material is covered with a planar heat insulating material made of glass wool. In a hot water supply apparatus having a hot water storage tank connected to a plurality of pipes and storing hot water heated by the heating apparatus, the hot water storage tank has an upper and a lower shell each covered with a foamable heat insulating material. A hot water supply apparatus, characterized in that a remaining outer shell not covered with a foamable heat insulating material is covered with a planar heat insulating material made of glass wool. The hot water supply apparatus according to claim 1 or 2, wherein the planar heat insulating material made of glass wool has glass wool accommodated in a bag body of a soft resin sheet. The hot water supply apparatus according to claim 1 or 2, wherein a reflection film is attached to the planar heat insulating material made of glass wool.

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