JP2008157516A - Water heater - Google Patents

Abstract

The present invention provides a hot water supply apparatus that is compact and compact and can reduce costs while ensuring the heat insulation performance of a hot water storage apparatus.
A hot water storage tank (4) for storing hot water heated to an arbitrary temperature is provided, and two types of heat insulating materials (vacuum heat insulating materials (13a-13c) and foam heat insulating materials (12a-12c)) are provided around the hot water storage tank (4). It is possible to reduce the diameter of the hot water storage tank 4 including the heat insulating material by improving the heat insulating performance or reducing the thickness of the heat insulating material while ensuring the heat insulating performance, and the hot water supply device can be made compact and compact. . Moreover, if it is the housing | casing 11 of the same size, it is possible to enlarge the capacity | capacitance of the hot water storage tank 4, it is hard to produce hot water outflow, and a low-cost hot-water supply apparatus can be provided.
[Selection] Figure 2

Description

  The present invention relates to a hot water supply apparatus including a hot water storage tank for storing hot water heated to an arbitrary temperature.

  Conventionally, as this type of hot water heater, a hot water heater that uses gas or petroleum as fuel and heats tap water with the combustion heat has been used. While these have the advantage of being excellent in quick hot water properties, fuels such as gas and oil are necessary and the supply thereof is indispensable, exhaust gas after combustion is released into the atmosphere, causing air pollution, and burning Therefore, there were problems such as being always unsafe and having a loud noise during combustion. Especially in all-electric houses and condominiums where all energy sources are electricity, which has been increasing in recent years, there is no way to supply fuel, so there are more cases where it cannot be used.

In view of this, a hot water supply apparatus having a large-capacity hot water storage tank for storing heated hot water has been developed. As a heating method, hot water of 80 ° C or higher, which is generally heated by an electric heater installed in the hot water storage tank at night, is stored in the hot water storage tank. The hot water and tap water are mixed to obtain an arbitrary temperature desired by the user and supplied from the hot water supply terminal.
As a heating method, a hot water storage type heat pump type hot water supply apparatus using a heat pump has been developed. It is equipped with a large-capacity hot water storage tank and an outdoor unit that incorporates a heat pump circuit, and uses cheap electricity at night discounts to heat tap water to hot water using the heat pump circuit and store the hot water in the hot water storage tank. The hot water and tap water are mixed to obtain an arbitrary temperature desired by the user and supplied from the hot water supply terminal.

  Since this heat pump type hot water supply apparatus is heated by utilizing the change in the state of the refrigerant, it is more energy efficient than the heating by the electric heater, and the capacity for input can be secured three times or more, and the running cost is also increased. It has features such as low cost, solves the problem of hot water heaters due to combustion, and can be easily installed in all-electric houses and condominiums without the need for new infrastructure.

  In any method, in order to store hot water heated in a hot water storage tank at midnight and mix the heated hot water and tap water at a predetermined temperature during the day, heat dissipation in the hot water storage tank is required. Suppressing and suppressing the temperature drop of the hot water in the hot water storage tank is an important point for improving energy efficiency.

Therefore, a heat insulating material is applied to the outer peripheral wall of the hot water storage tank to prevent the temperature from decreasing. Conventionally, glass wool is generally used as the heat insulating material, but as shown in FIG. 5, a heat insulating tank 40 having an outer periphery of a vacuum heat insulating material 41 is also proposed (for example, Patent Documents 1 and 2).
JP 2005-316560 A JP 2005-315480 A

However, in the configuration of the conventional hot water supply apparatus described in Patent Documents 1 and 2, a vacuum heat insulating material is used as the heat insulating material of the hot water storage tank, and the vacuum heat insulating material is provided around the vacuum heat insulating material. Although there is a merit that it can be made compact by suppressing the above, there is a problem that it becomes quite expensive in terms of cost. Further, since the vacuum heat insulating material is provided around the cylindrical hot water storage tank, there is a problem in that a gap is generated at the joint portion, and heat is radiated from the portion, resulting in a heat radiation loss.

  In particular, when a plurality of vacuum heat insulating materials are wound around a cylindrical hot water storage tank, a plurality of connecting portions are generated, and heat is radiated from the connecting portions, so that there is a tendency that heat insulation performance is deteriorated. In addition, when the vacuum heat insulating material breaks and breaks, or a hole is opened, the degree of vacuum disappears from the portion, and the heat insulating performance is significantly deteriorated.

  In particular, in equipment that has pipes or pumps attached to a hot water storage tank, such as a hot water supply device, the pipes and pumps may come into contact with the vacuum heat insulating material and be damaged. This led to further cost increases.

  This invention solves the said conventional subject, and it aims at providing the hot water supply apparatus which is small and compact and can also reduce cost, ensuring the heat insulation performance of a hot water storage apparatus.

  In order to solve the above-described conventional problems, a hot water supply apparatus of the present invention includes a hot water storage tank for storing hot water heated to an arbitrary temperature, and two types of heat insulating tanks, a vacuum heat insulating material and a foam heat insulating material, are provided on the outer periphery of the hot water storage tank The heat pump water heater can be reduced in size by reducing the diameter of the hot water storage tank including the heat insulating material by improving the heat insulating performance or reducing the thickness of the heat insulating material while ensuring the heat insulating performance. Can be achieved. Or if it is a housing | casing of the same size, it is possible to enlarge the capacity | capacitance of a hot water storage tank, it is hard to produce hot water outflow, and it can be set as a low-cost hot-water supply apparatus.

  Further, the hot water supply apparatus of the present invention includes a refrigerant cycle in which a compressor, a radiator, a decompression unit, and an air-refrigerant heat exchanger are sequentially connected to form a closed circuit to circulate the refrigerant, the radiator and the heat. A water-refrigerant heat exchanger for exchanging and a hot water storage tank for storing hot water heated by the water-refrigerant heat exchanger are housed in a single housing, and the outer periphery of the hot water tank is an abbreviation of the housing. A vacuum heat insulating material is provided in the lateral direction and / or substantially rearward, and a foam heat insulating material is provided around the outer periphery of the hot water storage tank. In order to reduce the size of the device, the size of the hot water storage tank cannot be made too large, so the gap between the piping and the hot water storage tank is reduced, but by using both foam insulation and vacuum insulation, Vacuum insulation while gaining hot water storage tank capacity While preventing damage, it is possible to increase the heat insulating performance may be a water heater that excels in usability.

  If the hot water supply apparatus of the present invention is downsized or has the same housing size, it is possible to increase the capacity of the hot water storage tank, and to supply a hot water supply apparatus that has excellent heat insulation performance and can reduce costs. Hot water does not run out during use, and is excellent in usability and cost reduction.

  1st invention is equipped with the hot water storage tank which stores the warm water heated to arbitrary temperature, and provided two types of heat insulating materials of the vacuum heat insulating material and the foam heat insulating material in the outer periphery of the said hot water storage tank, The diameter of the hot water storage tank including the heat insulating material can be reduced by reducing the thickness of the heat insulating material while ensuring the performance improvement or the heat insulating performance, and the heat pump water heater can be made compact and compact. Or if it is a housing | casing of the same size, it is possible to enlarge the capacity | capacitance of a hot water storage tank, it is hard to produce hot water outflow, and it can be set as a low-cost hot-water supply apparatus.

  In particular, the second invention has a rectangular housing for housing the hot water storage tank of the first invention, and a vacuum heat insulating material is provided at a portion of the outer periphery of the hot water storage tank having a narrow gap with the housing. Foam insulation is provided around each part where the gap between the case and the case is large. By sandwiching the vacuum insulation between the hot water storage tank and the case, adhesion can be improved, heat dissipation can be reduced, and heat insulation performance is excellent. It can be a hot water supply device. In addition, the vacuum heat insulating material does not come into contact with other parts such as piping of the hot water supply device and is not damaged, and stable heat insulating performance can be ensured over a long period of time.

  In particular, the third invention has a hot water storage tank according to the first invention, which is round when viewed from above, and a substantially cylindrical shape when viewed from the front, and the hot water storage tank is housed in a rectangular housing, A vacuum heat insulating material is provided around the outer periphery of the hot water storage tank in a substantially lateral direction, and a foam heat insulating material is provided around the outer periphery of the hot water storage tank. By sandwiching between the casings, adhesion can be improved, heat dissipation can be reduced, and a hot water supply device having excellent heat insulation performance can be obtained. In addition, the vacuum heat insulating material does not come into contact with other parts such as piping of the hot water supply device and is not damaged, and stable heat insulating performance can be ensured over a long period of time.

  In particular, the fourth invention is a hot water storage tank according to the first invention, which is round when viewed from above, and has a substantially cylindrical shape when viewed from the front, and the hot water storage tank is housed in a rectangular housing, A vacuum heat insulating material is provided around the outer periphery of the hot water storage tank substantially in the lateral direction and substantially rearward of the casing, and a foam heat insulating material is provided around the outer periphery of the hot water storage tank. By sandwiching the material between the hot water storage tank and the housing, it is possible to improve the adhesion, reduce the heat dissipation, and provide a hot water supply device with excellent heat insulation performance. In addition, the vacuum heat insulating material does not come into contact with other parts such as piping of the hot water supply device and is not damaged, and stable heat insulating performance can be ensured over a long period of time.

  In particular, the fifth aspect of the invention relates to the hot water storage tank of the first aspect of the present invention having a square cubic shape when viewed from above or from the front, and a vacuum heat insulating material on the outer periphery of the flat surface of the hot water storage tank. Each foam insulation is provided. By arranging the vacuum insulation on the flat surface, it is possible to improve the adhesion with the hot water storage tank, improve the insulation performance, and reduce the heat loss. Reduction can be achieved. In addition, since it is not necessary to bend and adhere the vacuum heat insulating material, damage or the like does not occur when the vacuum heat insulating material is refracted, so that productivity can be improved and cost can be reduced.

  In particular, the sixth invention is a heat pump circuit configured by sequentially connecting at least a compressor, a water-refrigerant heat exchanger, an air-refrigerant heat exchanger, and a decompression means to the hot water supply apparatus of the first invention. In the high-price heat pump type hot water supply device, it is possible to secure the heat insulation performance while reducing the cost, with the heat pump unit having hot water heated by the heat pump unit. It can be set as the hot-water supply apparatus which can raise a spread degree.

  In a seventh aspect of the invention, a compressor, a radiator, a decompression means, and an air-refrigerant heat exchanger are sequentially connected to form a closed circuit, a refrigerant cycle for circulating the refrigerant, and heat exchange with the radiator. A water-refrigerant heat exchanger and a hot water storage tank for storing hot water heated by the water-refrigerant heat exchanger are housed in a single housing, and the outer periphery of the hot water storage tank is substantially in the lateral direction of the housing and A vacuum heat insulating material is provided around the rear of the hot water storage tank, and a foam heat insulating material is provided around the outer periphery of the hot water storage tank. Since the size of the hot water storage tank cannot be made too large, the gap between the piping and the hot water storage tank is reduced, but by using both foam insulation and vacuum insulation, Prevent damage to vacuum insulation while gaining capacity While, it is possible to increase the heat insulating performance may be a water heater that excels in usability.

The eighth invention is particularly the foam heat insulating material of any one of the first to seventh inventions, wherein at least the end of the vacuum heat insulating material is pressed from the outside. It becomes possible to prevent the leakage of heat from the joint portion, and it is possible to improve without impairing the heat insulation performance. Moreover, by protecting the edge part of a vacuum heat insulating material with a foam heat insulating material, damage can be prevented and quality can be 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.

(Embodiment 1)
FIG. 1 is a front view of a hot water supply apparatus according to the first embodiment of the present invention, and FIG. 2 is a top view of a tank unit of the hot water supply apparatus.

  The hot water supply apparatus in the present embodiment includes a tank unit 1 and a heat pump unit 2 having a heat pump circuit. The tank unit 1 and the heat pump unit 2 are connected by two water pipes 3.

  The tank unit 1 has a hot water storage tank 4, and tap water is heated by the heat pump unit 2 and stored as hot water, and when necessary, it is mixed with tap water to supply hot water at a predetermined temperature. . In front of the hot water storage tank 4, piping 5 for hot water supply, various valve bodies, functional parts 6 such as a pump are arranged, and the supplied water and hot water in the hot water storage tank 3 are mixed, Parts for hot water supply from the hot water supply terminal are arranged.

  To the heat pump unit 2, a compressor 7, a water-refrigerant heat exchanger 8 that functions as a radiator and heats tap water, a decompression means (not shown), and an air-refrigerant heat exchanger 9 are sequentially connected. Built-in refrigerant cycle.

  Reference numeral 10 denotes a blower fan which is a blower disposed in front of the air-refrigerant heat exchanger 9 so as to suck air from the air-refrigerant heat exchanger 9 to increase the evaporation capacity and increase the heat pump heating capacity. It has become. Then, the tap water heated to 80 ° C. or more by the heat pump unit 2 becomes hot water, is carried to the tank unit 1 by the water pipe 3, and is stored in the hot water storage tank 4.

  FIG. 2 is a top view of the tank unit 1, 11 is a rectangular housing as viewed from above, and 4 is a metal hot water storage tank disposed inside the housing 11, as viewed from above. As shown in FIG. 1, it is circular and has a rectangular cylindrical shape when viewed from the front.

  Reference numeral 5 denotes piping for supplying hot water, and 6 denotes functional parts such as various valve bodies and pumps, which are arranged in front of the hot water storage tank 4, and supply water and hot water in the hot water storage tank 4. It is a part that mixes the hot water from the hot water supply terminal.

  Reference numerals 12a to 12c are foam heat insulating materials disposed on the outer periphery of the hot water storage tank 4 for keeping warm water stored in the hot water storage tank 4 and preventing a temperature drop thereof. The foam heat insulating material 12 a is disposed in front of the hot water storage tank 4, and the foam heat insulating materials 12 c and 12 b are disposed in the left and right corner portions behind the hot water storage tank 4.

  These foam heat insulating materials 12a, 12b, and 12c are made by foam molding of polystyrene foam or the like, and the shape thereof can be an arbitrary shape using a mold. Therefore, the foam heat insulating material 12 a in front of the hot water storage tank 4 has a shape that does not come into contact with the pipe 5 and the functional parts 6.

  Reference numerals 13a to 13c are vacuum heat insulating materials that are also arranged on the outer periphery of the hot water storage tank 4 to enhance the heat retaining performance. The vacuum heat insulating materials 13a and 13b are substantially horizontal to the left and right of the rectangular housing 2 as viewed from above. The vacuum heat insulating material 13c is provided substantially rearward.

  These vacuum heat insulating materials 13a, 13b, and 13c are obtained by putting a heat insulating material (not shown) in a metal laminate film (not shown) and then evacuating it to seal the heat insulating material. However, it is a heat insulating material that can be lowered to about 0.0033 W / m · K and has excellent heat insulating performance. As described above, in this embodiment, two types of heat insulating materials are provided around the outer peripheral wall of the hot water storage tank 3.

  Furthermore, the foam heat insulating materials 12a, 12b, and 12c are vacuum-heated so that the respective end portions of the foam heat insulating materials 12a, 12b, and 12c are vacuumed so as to press the respective end portions of the vacuum heat insulating materials 13a, 13b, and 13c from the outside. It arrange | positions so that it may become the outer side of the heat insulating materials 13a, 13b, 13c. The vacuum heat insulating materials 13a, 13b and 13c have a thermal conductivity of about 0.0033 W / m · K as described above. On the other hand, if the foam insulation is assumed to be polystyrene, the thermal conductivity is about 0.033 W / m · K, which is an order of magnitude different. However, in terms of cost, the vacuum insulation is an order of magnitude higher. Generally it is.

  Hereinafter, the operation and action of the hot water supply apparatus in the present embodiment will be described based on the drawings.

  The tap water supplied to the tank unit 1 is sent to the heat pump unit 2 through the water pipe 3 via the functional parts 6. In the heat pump unit 2, when the compressor 7 is driven, the refrigerant compressed and discharged to a high pressure is sent to the water-refrigerant heat exchanger 8, where the tap water sent from one water pipe 3 and Heat exchange to dissipate heat.

  Thereby, the tap water is heated to a high temperature and sent again to the tank unit 1 through the other water pipe 3. The hot water that has returned to the tank unit 1 due to high temperature is sent to the hot water storage tank 4 via the piping 5 for supplying hot water, various valve elements, pumps, and other functional parts 6, and is stored in the hot water storage tank 4. In order to prevent a decrease in temperature of the hot water stored in the hot water, foamed heat insulating materials 12a to 12c and vacuum heat insulating materials 13a to 13c are arranged on the peripheral wall of the hot water storage tank 4 as heat insulating materials.

  In the present embodiment, in order to increase the heat insulation performance of the heat insulating material and make it reasonable in terms of cost, as described above, the foam heat insulating materials 12a, 12b, 12c and the vacuum heat insulating materials 13a, 13b, 13c are provided. It is a combined configuration.

  Foam insulation generally has a thermal conductivity of about 0.033 W / m · K, and the thermal insulation performance is improved by increasing the thickness. Therefore, the foam heat insulating materials 12b and 12c are arranged behind the hot water storage tank 4 and at a corner portion of the casing 11 where the gap with the hot water storage tank 4 is large. In addition, there are piping 5 for supplying hot water, various valve elements, functional parts 6 such as a pump, and the like, and a foam heat insulating material 12a is also disposed in this part. This is because in the case of vacuum insulation, the vacuum is maintained, so this excellent thermal conductivity is maintained. When the vacuum is removed, the thermal conductivity is the same as that of normal insulation, and it is thin. Insulation performance will be lost.

  However, because there is a pipe or the like in front of the hot water storage tank 4 or there is a metal fitting or the like for holding the pipe, if the vacuum heat insulating material is arranged in that part, the vacuum is not used during assembly or maintenance. Insulation may be damaged. In order to prevent it, in this Embodiment, it is set as the foam heat insulating material 12a. On the other hand, if the gap between the hot water storage tank 4 and the housing 11 is filled in the substantially horizontal direction and the rear side of the hot water storage tank 4, the size of the hot water storage tank 4 can be increased and the capacity can be increased.

  Conversely, if the capacity of the hot water storage tank 4 is the same, the size of the housing 11 can be reduced, and the tank unit 1 can be made compact. By using the vacuum heat insulating materials 13a, 13b, and 13c at the small gaps, it becomes possible to increase the tank capacity or reduce the size of the tank unit 1 while improving the heat insulating performance. It is possible to improve the resistance to cutting, and in the latter case, it is possible to improve the installation property. In any case, it is possible to provide a hot water supply device that matches user needs.

  Also, in terms of cost, the cost can be reduced by using a large number of foam heat insulating materials 12a to 12c whose price is 1/10 of that of the vacuum heat insulating material, and a low-cost hot water supply apparatus can be obtained. Further, as described above, the vacuum heat insulating materials 13a, 13b, and 13c are configured by putting the heat insulating material in a metal laminate film, and then performing vacuum drawing, and sealing the heat insulating material. When there is such a curvature, the adhesion may be deteriorated. If the adhesion deteriorates and an air layer is generated between the hot water storage tank 4 and the vacuum heat insulating materials 13a, 13b, and 13c, air convection occurs in the air layer, which may cause a decrease in heat insulating performance.

  On the other hand, in the present embodiment, the vacuum heat insulating materials 13a, 13b, and 13c can be used in a shape that is as close to a straight line as possible. It becomes possible to make it adhere. At that time, the foam heat insulating materials 12a, 12b, and 12c are arranged so as to press the vacuum heat insulating materials 13a, 13b, and 13c from the outside, thereby making it possible to further improve the adhesion and improving the heat insulating performance. It is possible to plan.

(Embodiment 2)
FIG. 3 is a top view of the hot water supply apparatus according to the second embodiment of the present invention. In addition, about the same component as the hot water supply apparatus in the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The hot water supply apparatus in the present embodiment has a hot water storage tank 4a installed in the tank unit 1a as a square shape with an R provided at the corner portion when viewed from above, and has a square shape although not shown from the front. It is what is called a cube shape.

  In the present embodiment, the foam heat insulating materials 12d, 12e, 12f, and 12g are used at the four corners of the hot water storage tank 4a (the hatched portions), and the foam heat insulating materials 12d, 12e, 12f, and 12g are respectively used. Vacuum heat insulating materials 13d, 13e, 13f, and 13g are arranged on a straight line portion formed between two adjacent ones.

  Thereby, by arranging the vacuum heat insulating materials 13d, 13e, 13f, and 13g in the front, rear, left and right linear portions, it is possible to improve the heat insulating performance while making the tank unit 1a compact. In particular, by using the vacuum heat insulating materials 13d to 13g having a metal laminate film structure in the straight portion, the heat insulating materials 13d to 13g can be used in a straight shape, and the adhesion can be improved. Further, it is possible to prevent an air layer from being generated in the gap between the vacuum heat insulating materials 13d, 13e, 13f, and 13g, and to further improve the heat insulating performance.

  Also, by using foam insulation 12d, 12e, 12f, and 12g at the corner of the hot water storage tank 4a, it becomes possible to increase the thickness of each, and when using a vacuum insulation while improving the insulation performance The problem is eliminated with respect to the problem of deterioration of heat insulation performance due to lack of adhesion.

In the case of this cubic hot water storage tank 4a, the piping 5a for supplying hot water, various valve bodies, and functional parts 6a such as a pump are arranged on the right side of the tank unit 1a to reduce the thickness. Since the functional parts 6a such as piping 5a for supplying hot water, various valve bodies and pumps and the tank unit 4a are in a narrow range, and the right side of the tank unit 4a is also linear, the partition plate 21 is arranged. In addition, since the vacuum heat insulating material 13e is separated from the functional parts 6a such as the piping 5a for supplying hot water, various valve bodies and pumps, the vacuum heat insulating material 13e can be used. Thus, the tank unit 1a can be made compact.

  In the case of the first embodiment, when the same partition plate is used, the functional parts 6 such as the piping 5 for supplying the hot water, various valve bodies, and the pump largely project outward, and the tank unit 1 The thickness of the tank unit 1 is increased and the size of the tank unit 1 is increased. However, when the tank unit 4a which is a thin rectangular tank as in the present embodiment is used, the influence is reduced. It is also possible to do.

  As described above, according to the present embodiment, it is possible to increase the tank capacity of the tank unit 4a while reducing the size of the tank unit 1a, and to provide a hot water supply device excellent in usability and installability. Is possible.

(Embodiment 3)
FIG. 4 is a top view of the hot water supply apparatus according to the third embodiment of the present invention. In addition, about the same component as the hot water supply apparatus in the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the first and second embodiments, the hot water supply apparatus in which the tank unit and the heat pump unit are separated has been described as an example. However, in the present embodiment, the tank unit and the heat pump unit are housed in an integrated housing. The integrated heat pump hot-water supply device can be applied to the techniques of the first and second embodiments to improve the heat insulation performance while reducing the overall size of the hot-water supply device. Thus, a hot water supply device excellent in usability and installation can be obtained.

  Hereinafter, the hot water supply apparatus in the present embodiment will be described.

  In FIG. 4, the hot water supply apparatus in the present embodiment includes a compressor 14, a radiator 15, a decompression means 16, and an air-refrigerant heat exchanger 17 that are sequentially connected to form a closed circuit, and a refrigerant that circulates the refrigerant. A hot water storage system for storing hot water heated by the water-refrigerant heat exchanger 18 and connected to the water-refrigerant heat exchanger 18, a water-refrigerant heat exchanger 18 that exchanges heat with the radiator 15 The tank 4b is housed in a single casing 19 to form an integrated heat pump type hot water heater, and vacuum heat insulating materials 13h, 13i, 13h, 13i, 13j is provided around the outer periphery of the hot water storage tank 4b, and foam insulations 12h, 12i, and 12j are provided around the outer periphery of the hot water storage tank 4b.

  In the case of the integrated heat pump hot water supply apparatus, the size of the hot water storage tank 4b cannot be increased so much, and the gap between the hot water storage tank 4b and the piping 20 disposed in front of the hot water storage tank 4b becomes narrow.

  In this state, in order to increase the heat insulating performance while increasing the capacity of the hot water storage tank 4b and preventing the vacuum heat insulating materials 13h, 13i, 13j from being damaged, the foam heat insulating materials 12h, 12i, 12j and the vacuum heat insulating materials 13h, 13i , 13j in combination is very effective, and can provide a heat pump type hot water supply apparatus that is compact and has a high hot water resistance.

As described above, the hot water supply apparatus according to the present invention is small and compact while ensuring heat insulation performance, and can be reduced in cost, and can be widely applied to various devices that require a heat retaining structure.

Front view of hot water supply apparatus in the first embodiment of the present invention Top view of the tank unit of the water heater Top view of hot water supply apparatus according to second embodiment of the present invention Top view of hot water supply apparatus according to the third embodiment of the present invention Sectional view of a hot water storage tank of a conventional water heater

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a Tank unit 2 Heat pump unit 4, 4a, 4b Hot water storage tank 7 Compressor 8, 18 Water-refrigerant heat exchanger 9, 17 Air-refrigerant heat exchanger 11, 11a, 19 Case 12a-12j Foam insulation 13a ~ 13j Vacuum heat insulating material 14 Compressor 15 Radiator 16 Pressure reducing means

Claims (8)

A hot water supply apparatus comprising a hot water storage tank for storing hot water heated to an arbitrary temperature, and two types of heat insulating materials, a vacuum heat insulating material and a foam heat insulating material, are provided around the hot water storage tank. A rectangular housing for storing the hot water storage tank, and a vacuum heat insulating material at a portion of the outer periphery of the hot water storage tank having a narrow gap with the housing, and a foam heat insulating material at a portion having a large gap with the housing. The hot water supply apparatus according to claim 1, wherein each of the hot water supply apparatuses is provided around each other. The hot water storage tank has a round shape when viewed from above and a rectangular shape when viewed from the front. The hot water storage tank is accommodated in a rectangular shape housing, and the lateral direction of the casing on the outer periphery of the hot water storage tank. The hot water supply apparatus according to claim 1, wherein a vacuum heat insulating material is provided around the outer periphery of the hot water storage tank, and a foam heat insulating material is provided around the outer periphery of the hot water storage tank. The hot water storage tank has a round cylindrical shape when viewed from above and a rectangular shape when viewed from the front. The hot water storage tank is accommodated in a rectangular housing, and the outer periphery of the hot water storage tank is substantially lateral to the housing. The hot water supply apparatus according to claim 1, wherein a vacuum heat insulating material is provided around the direction and substantially rearward, and a foam heat insulating material is provided around the outer periphery of the hot water storage tank. The hot water storage tank has a rectangular cubic shape when viewed from above or from the front, and a vacuum heat insulating material is disposed on the outer peripheral surface of the hot water storage tank, and a foam heat insulating material is provided at the corner portion. The hot water supply apparatus according to claim 1. At least a compressor, a water-refrigerant heat exchanger, an air-refrigerant heat exchanger, and a heat pump unit having a heat pump circuit configured by sequentially connecting decompression means, and hot water heated by the heat pump unit is stored in a hot water storage tank The hot water supply device according to claim 1, wherein the hot water supply device is stored. A compressor, a radiator, a decompression means and an air-refrigerant heat exchanger are sequentially connected to form a closed circuit, a refrigerant cycle for circulating the refrigerant, and a water-refrigerant heat exchanger for exchanging heat with the radiator And a hot water storage tank for storing hot water heated by the water-refrigerant heat exchanger are housed in a single housing, and a vacuum is provided in a substantially lateral direction and / or substantially behind the outer periphery of the hot water storage tank. A hot water supply apparatus characterized in that a heat insulating material is provided around and a foam heat insulating material is provided around the outer periphery of the hot water storage tank. The hot water supply apparatus according to any one of claims 1 to 7, wherein at least an end portion of the vacuum heat insulating material is pressed from outside by a foam heat insulating material.

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