JP2009092306A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater having high usability by preventing a shortage of hot water, by enhancing efficiency of an apparatus by reducing a heat radiation loss from a hot water storage tank. <P>SOLUTION: A heat insulating material of an upper part of at least hot water storage tank 2 is made to be a molded heat insulating material among a plurality of heat insulating materials (11a, 11b, 11c) for heat insulating the hot water storage tank 2, and a high-temperature member storage space 18 for storing a hot water upper pipe line 4 and a mixing valve 3 for connecting at least the mixing valve 3 and the upper part of the hot water storage tank 2 is provided between the upper part of the hot water storage tank 2 and the molded heat insulating material. The amount of heat radiating from the upper part of the hot water storage tank 2 to the ambient atmosphere is reduced and the heat capacity of the hot water storage tank 2 is maintained by closely providing a vacuum heat insulating material 19 on the upper part of the molded heat insulating material for forming the high-temperature member storage space 18, and therefore, the hot water storage type water heater having high usability can be provided by preventing a shortage of hot water, and the efficiency of the apparatus can be improved by reducing the amount of power required for heating water. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot water supply apparatus that stores water heated by a heating means in a hot water storage tank and uses it for hot water supply, bath hot water filling and heat insulation, heating, drying, and the like.

  A conventional hot water storage type hot water supply apparatus of this type heats water to high temperature hot water by a heating means, stores it in a hot water storage tank covered with a heat insulating material, and uses it at a hot water supply terminal. FIG. 11 shows a conventional general hot water storage type hot water supply apparatus.

  As shown in FIG. 11, the low-temperature water supplied and stored in the hot water storage tank 2 from the water supply pipe 14 is supplied to the heating means 1 via the water inlet pipe 12 by the water pump 9 disposed in the water inlet pipe 7. Be transported. The hot water heated to the high temperature by the heating means 1 is supplied to the hot water storage tank 2 by the hot water piping 13 connected to the heating means 1 and the hot water outlet pipe 8 connected to the hot water piping 13 and leading the hot water to the hot water storage tank 2. It is stored from the top.

  When using hot water at the hot water supply terminal 16 such as a faucet, the hot water supplied from the hot water supply pipe 5 connected to the hot water supply pipe 14 and the hot water supplied from the hot water supply upper pipe 4 connected to the hot water storage tank 2 are: The mixing valve 3 mixes hot water and hot water so that the hot water is set to a temperature set by a remote controller (not shown) or the like, and the hot water having the set temperature is supplied to the hot water supply pipe 6 and the hot water supply pipe 6. Is supplied to the hot water supply terminal 16 via the hot water supply pipes 15 connected to the. The hot water storage tank 2 is covered with a heat insulating material 17 in order to suppress the amount of heat radiated from the hot water storage tank 2 to the atmosphere. The hot water storage tank 2, the mixing valve 3, the hot water supply upper pipe 4, the water supply pipe 5, the hot water supply pipe 6, the incoming water pipe 7, the hot water outlet pipe 8, the water pump 9, etc. By being surrounded by the exterior body 10b and the exterior body 10c at the bottom, it is formed as a hot water storage type hot water supply apparatus.

  As the heat insulating material 17, a heat insulating material with high heat insulating performance (low thermal conductivity) is used. Therefore, the amount of heat released from the hot water storage tank 2 is reduced, and the heat capacity of the hot water storage tank 2 can be maintained for a relatively long time. Further, as the amount of heat radiated from the hot water storage tank 2 is reduced, the amount of electric power required for heating and heat insulation is reduced. The material of the heat insulating material 17 is, for example, a foamed resin such as foamed polypropylene or foamed polystyrene, or a fiber material such as glass wool or glass fiber.

By the way, since the upper part of the hot water storage tank 2 is hot, places close to the upper part of the hot water storage tank 2 such as the hot water supply upper pipe 4, the mixing valve 3, the hot water supply pipe 6, and the outlet hot water pipe 8 are hot. . It is possible to insulate the pipe portion that becomes high temperature relatively easily by using a pipe heat insulating material (not shown), but the heat insulation of the main body of the mixing valve 3, the connection portion between the mixing valve 3 and the pipe, and the hot water storage tank 2 Since there is a connection fitting (not shown), there is a problem that it is not possible to sufficiently insulate the connection between the pipe and the pipe. Alternatively, if sufficient heat insulation is performed, there is a problem that the shape of the heat insulating material becomes complicated and attachment becomes difficult.
As a means for solving such a problem, there is a method using a molded heat insulating material that can be formed into a relatively complicated shape. (For example, refer to Patent Document 1). FIG. 12 shows a conventional hot water storage type hot water supply apparatus described in Patent Document 1. As shown in FIG.

As shown in FIG. 12, the hot water storage tank 2 is thermally insulated by molded heat insulating materials 171, 172, 173, 174 and 175. And the groove part 51 for pipes which accommodates a pipe line (for example, hot water supply upper pipe line 4) is provided, and it is set as the structure which heat-insulates and heat-insulates a pipe line.
JP 2002-310511 A

  However, in the conventional configuration, since the pipe groove 51 for accommodating the pipe (for example, the hot water supply upper pipe 4) is provided, the thickness of the molded heat insulating material of the pipe groove 51 is reduced. That is, in FIG. 12, the thickness t of the groove is the thickness T other than the groove. Since the pipe groove 51 shown in the figure shows a case where one pipe (hot water supply upper pipe 4) is accommodated, the region where the thickness of the molded heat insulating material is thin is relatively narrow. However, in fact, in addition to the hot water supply upper pipe 4, the hot water discharge pipe 8, the mixing valve 3, and the like are installed at the upper part of the hot water storage tank 2, so that the area of the pipe groove 51 is further increased. The area | region where the thickness of a molding heat insulating material is thin becomes large, and sufficient heat insulation performance was not acquired, but there existed a subject that heat dissipation loss increased.

  In addition, it is conceivable that the thickness of the molded heat insulating material of the duct groove portion 51 is made closer to the thickness of the other part (the thickness t is changed to the thickness T), but in this case, the dimension is increased in the height direction. Since it becomes large and the size of the hot water supply apparatus becomes large, there is a problem that the degree of freedom in installation is reduced and the cost of the product is increased.

  The present invention solves the above-described conventional problems, and provides a hot water storage type hot water supply device that is highly usable by reducing heat loss from the hot water storage tank and improving the efficiency of the equipment and preventing hot water from running out. With the goal.

  In order to solve the above-mentioned conventional problems, the hot water storage type hot water supply apparatus of the present invention uses a heat insulating material at least above the hot water storage tank as a molded heat insulating material among a plurality of heat insulating materials, and the upper portion of the hot water storage tank and the molded heat insulating material. A hot water supply upper pipe line connecting at least the mixing valve and the upper part of the hot water storage tank and a high temperature member storage space for storing the mixing valve, and an upper portion of the molded heat insulating material forming the high temperature member storage space The vacuum heat insulating material is disposed in close contact with each other.

  As a result, high temperature members such as pipes and mixing valves connected to the upper part of the hot water storage tank are insulated by covering them with molded heat insulating material, and in addition, the heat insulating performance is excellent in the parts where the molded heat insulating material is thin. Since the vacuum heat insulating material is closely arranged, the amount of heat radiated from the upper part of the hot water storage tank to the atmosphere is reduced to approximately the same size as the conventional hot water supply system.

  According to the present invention, it is possible to provide a hot water storage type hot water supply apparatus having high usability by reducing the heat dissipation loss from the hot water storage tank and improving the efficiency of the equipment and preventing hot water from running out.

  1st invention makes a heat insulating material of the upper part of the said hot water storage tank at least the heat insulating material among the heat insulating materials which insulate a hot water tank into a molded heat insulating material, and mixes at least between the upper part of the said hot water storage tank and the said molded heat insulating material. A hot water supply upper pipe line connecting the valve and the upper part of the hot water storage tank and a high temperature member storage space for storing the mixing valve are provided, and a vacuum heat insulating material is closely attached to an upper portion of the molded heat insulating material forming the high temperature member storage space. Since the amount of heat radiated from the upper part of the hot water storage tank to the atmosphere is reduced, the heat capacity of the hot water storage tank is maintained, so that a hot water storage type hot water supply device with improved usability can be provided by preventing hot water from running out. At the same time, the amount of power required to heat the water is reduced, and the efficiency of the device can be improved.

According to the second aspect of the present invention, the shape of the vacuum heat insulating material becomes a simple shape by arranging a flat vacuum heat insulating material as a flat portion where the molded heat insulating material and the vacuum heat insulating material are in close contact with each other. The workability of the work of attaching the vacuum heat insulating material to the surface is improved, the work reliability is improved, the heat insulation can be surely performed, and the manufacturing cost of the vacuum heat insulating material can be reduced.

  According to a third aspect of the present invention, there is provided a hot water storage that is in contact with the side surface exterior body by using a heat insulating material on the side surface portion of the hot water storage tank as a vacuum heat insulating material and causing a part of the molded heat insulating material on the upper part of the hot water storage tank to contact the side surface of the exterior body. The molded insulation at the top of the tank prevents the vacuum insulation from coming into direct contact with the exterior body and prevents damage to the vacuum insulation, improving the efficiency of the equipment without compromising the reliability of the insulation performance of the vacuum insulation. Furthermore, since the thickness of the heat insulating material can be reduced, it is possible to reduce the size of the hot water supply device or increase the capacity of the hot water storage tank.

  According to the fourth aspect of the present invention, a part of the molded heat insulating material at the upper part of the hot water storage tank comes into contact with the vicinity of the corner of the side surface of the exterior body, thereby making it possible to reduce the size of the hot water supply device or increase the capacity of the hot water storage tank. .

  The fifth invention uses a heat pump that uses carbon dioxide as a refrigerant as the heating means, and operates on a high pressure side in a state that exceeds the critical pressure, so that the hot water storage type hot water supply device can be used at a high temperature. The increase in the heat capacity of the tank and the ability to prevent 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.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a hot water storage type hot water supply apparatus according to a first embodiment of the present invention. In FIG. 1, the heating means 1 is a heating heat source that heats the water stored in the hot water storage tank 2 to a high temperature, and the mixing valve 3 includes feed water supplied from a feed water pipe 5 connected to a feed water pipe 14, and The hot water supplied from the hot water supply upper pipe line 4 connected to the upper part of the hot water storage tank 2 is mixed with hot water and hot water so that it becomes hot water having a temperature set by a remote controller (not shown) or the like. The hot water at the set temperature is supplied to the hot water supply terminal 16 via the hot water supply pipe 6 and the hot water supply pipe 15 connected to the hot water supply pipe 6 in order.

  As in the conventional configuration of FIG. 11, the water supply supplied to the hot water storage tank 2 from the water supply pipe 14 and stored is conveyed to the heating means 1 via the water input pipe 12 by the water pump 9 of the water input pipe 7. The The hot water heated to the high temperature by the heating means 1 is connected to the hot water storage tank 2 by the hot water supply pipe 13 connected to the heating means 1 and the hot water supply pipe 8 connected to the hot water supply pipe 13 to guide the hot water to the upper part of the hot water storage tank 2. Store from above. At this time, in the hot water storage tank 2, hot hot water is stored in the upper portion and low temperature water is stored in a stacked state in the lower portion. The hot water storage tank 2, the mixing valve 3, the hot water supply upper pipe 4, the water supply pipe 5, the hot water supply pipe 6, the incoming water pipe 7, the hot water outlet pipe 8, the water pump 9, etc. By being surrounded by the exterior body 10b and the exterior body 10c at the bottom, it is formed as a hot water storage type hot water supply apparatus.

  Here, the outer surface of the hot water storage tank 2 is provided with heat insulating materials 11a, 11b, and 11c. That is, the upper heat insulating material 11 a as the heat insulating material at the upper part of the hot water storage tank 2, the side heat insulating material 11 b as the heat insulating material at the side surface of the hot water storage tank 2, and the lower heat insulating material 11 c as the heat insulating material at the lower part of the hot water storage tank 2. The upper heat insulating material 11a is a molded heat insulating material, and a high temperature member storage space 18 is provided between the upper heat insulating material 11a and the upper part of the hot water storage tank 2, and at least the hot water supply upper pipe line 4 and the high temperature member storage space 18 are provided. The mixing valve 3 is accommodated.

Here, as the material of the molded heat insulating material, for example, a foamed resin such as foamed polypropylene or foamed polystyrene is used. Further, a vacuum heat insulating material 19 is provided on the surface of the upper heat insulating material 11 a above the high temperature member housing space 18. The hot water storage tank 2 includes a plurality of temperature sensors 20 (20a) for detecting the amount of hot water stored in the hot water storage tank 2 in a stacked state in the hot water storage direction.
20b, 20c, 20d ...). The amount of hot water remaining in the hot water storage tank is calculated according to the temperatures detected by the plurality of temperature sensors 20, and when this value is less than a predetermined value set in advance, the heating means 1 is operated to perform hot water storage tank 2 Increase the amount of heat stored in the hot water.

  FIG. 2 is a schematic view of the hot water storage tank of the hot water storage type hot water supply apparatus of the present embodiment as viewed from above, FIG. 3 is a cross-sectional view of the hot water storage tank shown in FIG. FIG. FIG. 2 is a schematic view of the hot water storage tank 2 as viewed from above with the upper heat insulating material 11a and the vacuum heat insulating material 19 removed. The alternate long and short dash line is the virtual projection surface of the vacuum heat insulating material 19. As shown in the figure, the hot water supply upper conduit 4 and the hot water discharge conduit 8 are connected to the upper portion of the hot water storage tank 2. And the mixing valve 3 connected to the hot water supply upper pipe line 4 is arrange | positioned at the upper part of a hot water storage tank.

  FIG. 3 shows a cross-sectional view of the hot water storage tank shown in FIG. 2 in the A-A ′ direction, and a cross-sectional view of the upper heat insulating material 11 a and the vacuum heat insulating material 19 that insulate the upper part of the hot water storage tank 2. Further, FIG. 4 shows an arrangement in which an upper heat insulating material 11a and a vacuum heat insulating material 19 are arranged on the upper part of the hot water storage tank 2 shown in FIG. As shown in the figure, a space formed by the hot water storage tank 2 and the upper heat insulating material 11 a becomes a high temperature member storage space 18.

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

  Since the hot water heated by the heating means 1 is stored in the hot water storage tank 2 from the outlet hot water pipe 8 connected to the upper part of the hot water storage tank 2, there is always high temperature hot water in the upper part of the hot water storage tank 2. For this reason, the vicinity part connected to the upper part of the hot water storage tank 2 of the hot water supply upper pipe line 4 and the hot water supply pipe line 8 is also always high temperature. And the mixing valve 3 connected to the hot water supply upper pipe line 4 is also always high temperature. Then, if it is going to insulate with the upper heat insulating material 11a including the part which becomes hot, such as the hot water supply upper pipe line 4 and the mixing valve 3, the high temperature member storage space 18 will be a comparatively large space. As a result, the thickness of the heat insulating material forming the high temperature member storage space 18 is reduced. Therefore, the vacuum heat insulating material 19 excellent in heat insulating performance is disposed in close contact with the thin portion of the upper heat insulating material 11a.

  Thus, heat insulation loss can be reduced without increasing the thickness of the whole heat insulating material by adding a vacuum heat insulating material to the thin portion of the heat insulating material for heat insulation. For this reason, the amount of heat radiated from the upper part of the hot water storage tank to the atmosphere is reduced, so that the heat capacity of the hot water storage tank is maintained, and at the same time, a hot water storage type hot water supply device with improved usability can be provided by preventing hot water shortage, The amount of power required to heat the water is reduced, and the efficiency of the device can be improved.

  In FIG. 4, since the vacuum heat insulating material 19 is closely attached and fixed to the upper heat insulating material 11 a having no depression, the thickness of the vacuum heat insulating material 19 is increased. However, as shown in FIG. If a recess for accommodating the vacuum heat insulating material 19 is provided in the material 11a and the vacuum heat insulating material 19 is fixed in close contact with the upper heat insulating material 11a, the thickness of the entire heat insulating material will not increase.

  Further, the surface of the upper heat insulating material 11a for tightly fixing the vacuum heat insulating material 19 is a flat surface, and the shape of the vacuum heat insulating material 19 is also a flat plate shape. This simplifies the manufacture of the vacuum heat insulating material. Furthermore, since a flat plate-like object is fixed to the flat portion, the assembly is easy and the reliability of the assembly is improved. For this reason, it has the effect that the reliability of heat insulation improves and the manufacturing cost of a vacuum heat insulating material also falls.

(Embodiment 2)
6 is a cross-sectional view of the hot water storage tank of the hot water storage type hot water supply apparatus in the second embodiment of the present invention, and FIG. 7 is a cross-sectional view of the hot water storage tank shown in FIG. 6 in the BB ′ direction.

  In the present embodiment, the differences from the first embodiment are as follows. That is, in FIG. 6, the side heat insulating material 11b, which is the heat insulating material on the side surface of the hot water storage tank 2, is used as the vacuum heat insulating material. Moreover, as shown in FIG. 7, the upper heat insulating material 11a is in contact with the exterior body 10b on the side surface portion and the points K, L, M, and N. In addition, the part of the same code | symbol as Embodiment 1 has the same structure, and abbreviate | omits description.

  The side heat insulating material 11b which is a heat insulating material of the body portion of the hot water storage tank 2 is used as a vacuum heat insulating material, and a part of the upper heat insulating material 11a which is a molded heat insulating material on the upper portion of the hot water storage tank 2 is brought into contact with the outer surface body 10b of the side surface portion. As a result, the vacuum heat insulating material, which is the side heat insulating material 11b, is prevented from coming into direct contact with the exterior body and the vacuum heat insulating material is prevented from being damaged, so that the efficiency of the equipment can be improved without impairing the reliability of the heat insulating performance of the vacuum heat insulating material. Can be realized. Furthermore, since the thickness of the heat insulating material can be reduced, it is possible to reduce the size of the hot water supply device or increase the capacity of the hot water storage tank.

(Embodiment 3)
FIG. 8 is a cross-sectional view of a hot water storage tank of the hot water storage type hot water supply apparatus according to the third embodiment of the present invention, and FIG. 9 is a cross-sectional view of the hot water storage tank shown in FIG.

  In the present embodiment, the difference from the second embodiment is that a protrusion 21 is provided on the upper heat insulating material 11a, and this protrusion 21 is in contact with the exterior body 10b on the side surface at the corner of the exterior body 10b on the side surface. It is that. In addition, the part of the same code | symbol as Embodiment 2 has the same structure, and abbreviate | omits description.

  In the case of Embodiment 2 shown in FIG. 7, the portion where the upper heat insulating material 11a and the side surface exterior body 10b abut is the portion where the hot water storage tank 2 and the side surface exterior body 10b are closest to each other. On the other hand, in the case of the present embodiment, the portion in contact with the upper heat insulating material 11a and the side surface exterior body 10b is a corner of the side surface exterior body 10b. If it does in this way, since it becomes possible to approximate the diameter of the top heat insulating material 11a to the outer peripheral diameter of the side surface heat insulating material 11b, the exterior body can be made smaller than in the case of the second embodiment. It is possible to reduce the size or increase the capacity of the hot water storage tank.

  In the first to third embodiments, a heat pump as shown in FIG. 10 is used as the heating unit 1, and the compressor 22, the hot water supply heat exchanger 23, the decompression unit 24, and the air heat exchanger 25 are sequentially connected to the refrigerant circuit 26. It may be connected in a ring shape. The water in the hot water storage tank 2 is heated to a high temperature by the hot water supply heat exchanger 23 and then returned to the upper part of the hot water storage tank 2 again. 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 heat capacity of the hot water storage tank 2 can be increased and the hot water prevention property can be further improved.

  The hot water storage type hot water supply apparatus according to the present invention leads to prevention of problems such as an increase in power consumption due to heat dissipation loss of the hot water storage tank, a decrease in the amount usable as hot water, and in addition to hot water, bath, heating, or It can also be used for applications such as waste heat source hot water storage hot water supply devices.

The block diagram of the hot water storage type hot water supply apparatus in Embodiment 1 of this invention Schematic view of the hot water storage tank of the hot water storage system from above. Sectional view of the hot water storage tank shown in FIG. Configuration of the upper part of the hot water storage tank of the hot water storage system Configuration diagram of the upper part of the hot water storage tank showing another embodiment of the hot water storage type hot water supply apparatus Sectional drawing of the hot water storage tank of the hot water storage type hot water supply apparatus in the 2nd Embodiment of this invention Sectional view of the hot water storage tank shown in FIG. Sectional drawing of the hot water storage tank of the hot water storage type hot water supply apparatus in the 3rd Embodiment of this invention C-C 'direction sectional view of the hot water storage tank shown in Fig. 8 of the hot water storage type hot water supply apparatus The block diagram of the other hot water storage type hot-water supply apparatus in Embodiment 1-3 of this invention Configuration diagram of a conventional hot water storage hot water supply system Cross-sectional view of the hot water storage tank of the hot water storage system

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating means 2 Hot water storage tank 3 Mixing valve 4 Hot water supply upper pipe 10a Exterior body 10b Exterior body 10c Exterior body 11a Thermal insulation material 11b Thermal insulation material 11c Thermal insulation material 14 Water supply piping 15 Hot water supply piping 16 Hot water supply terminal 18 High temperature member storage space 19 Vacuum thermal insulation material

Claims (5)

A heating means for heating water, a hot water storage tank for storing hot water heated by the heating means, a water supply pipe for supplying water, and a mixing valve for mixing hot water at the upper part of the hot water storage tank and water from the water supply pipe A hot water supply pipe for supplying hot water mixed by the mixing valve to a hot water supply terminal, a plurality of heat insulating materials for insulating the hot water storage tank, the hot water storage tank insulated by the heat insulating material, the water supply pipe, and the mixing valve A heat insulating material at least above the hot water storage tank among the plurality of heat insulating materials as a molded heat insulating material, and at least between the upper portion of the hot water storage tank and the molded heat insulating material. A hot water supply upper pipe line connecting the mixing valve and the upper part of the hot water storage tank and a high temperature member storage space for storing the mixing valve are provided, and a vacuum heat insulating material is closely attached to the upper part of the molded heat insulating material forming the high temperature member storage space. And place Hot water storage type water heater, characterized in that configuration and the. 2. The hot water storage type hot water supply apparatus according to claim 1, wherein a portion where the molded heat insulating material and the vacuum heat insulating material are in close contact with each other is a flat surface, and a flat plate vacuum heat insulating material is disposed. The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein the heat insulating material on the side surface of the hot water storage tank is a vacuum heat insulating material, and a part of the molded heat insulating material on the upper side of the hot water storage tank is in contact with the side surface of the exterior body. The hot water storage type hot water supply device according to claim 3, wherein the hot water storage type hot water supply device is in contact with the vicinity of a corner portion of a side surface of the exterior body. The heating means is a heat pump unit in which a compressor, a hot water supply heat exchanger, a decompression means, and an air heat exchanger are connected by a refrigerant circuit, using carbon dioxide as a refrigerant and operating in a state exceeding supercriticality on the high pressure side. The hot water storage type hot water supply apparatus according to any one of claims 1 to 4.

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