JP2009236476A - Hot water storage tank unit and heat pump water heater using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage tank unit having high practicability by reducing radiation loss from a hot water storage tank and increasing the degree of freedom in installation. <P>SOLUTION: The hot water storage tank unit includes the hot water storage tank 2, an upper heat insulating material 11a disposed at an upper part of the hot water storage tank 2, a lower heat insulating material 11c disposed at a lower part of the hot water storage tank 2, and a side face heat insulating material 11b disposed at a side face of the hot water storage tank 2. The side face heat insulating material 11b has a heat-welded part end face 22 which is an outer peripheral part of a shell material 21 heat-welded for vacuum sealing. The heat-welded part end face 22 is extended and bent so as not to come in contact with the hot water storage tank 2. The degree of vacuum in a vacuum insulating material can be maintained, and reliability of heat insulation can be improved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat insulating structure of a hot water storage tank of a hot water storage hot water supply apparatus such as a heat pump water heater or an electric water heater.

  A conventional hot water supply apparatus using this type of hot water storage tank unit heats water to hot water by heating means, stores it in a hot water storage tank covered with a heat insulating material, and when there is a hot water supply request, The structure uses hot water. FIG. 5 shows a general hot water storage type hot water supply apparatus using such a conventional hot water storage tank unit (see, for example, Patent Document 1).

  As shown in FIG. 5, 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. It is formed as a hot water storage tank unit by being surrounded by the exterior body 10b and the exterior body 10c at the bottom.

  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, the hot water storage tank 2 is connected to the hot water discharge pipe 8 and the hot water supply upper pipe 4 described above, and further, the mixing valve 3 to which the hot water supply upper pipe 4 is connected is arranged. Therefore, when the upper part of the hot water storage tank is insulated, the shape of the heat insulating material becomes complicated. If a heat insulating material made of a fiber material such as glass wool or glass fiber is used, heat insulation can be performed relatively easily. However, since the heat insulating performance is poor, there is a problem that the thickness of the heat insulating material increases. As one means for solving such a problem, there is a method using a molded heat insulating material using a foamed resin that can be formed into a relatively complicated shape.

  In addition, as described above, the thickness of the heat insulating material 17 is increased to reduce the amount of heat radiated, so that the shape of the apparatus is increased, and the degree of freedom of installation location is small. Therefore, downsizing of the apparatus is desired from the viewpoint of the degree of freedom of installation of the hot water supply apparatus.

And in order to respond | correspond to this, using the vacuum heat insulating material excellent in heat insulation performance, reducing the thickness of a heat insulating material and aiming at size reduction of an apparatus is proposed. FIG. 6 shows such an example.
In the figure, the outer surface of the hot water storage tank 2 is provided with heat insulating materials 11a, 11b and 11c. That is, an upper heat insulating material 11 a as a heat insulating material on the upper side of the hot water storage tank 2, a side surface heat insulating material 11 b as a heat insulating material on the side surface of the hot water storage tank 2, and a lower heat insulating material 11 c as a heat insulating material on the lower side of the hot water storage tank 2. The upper heat insulating material 11a and the lower heat insulating material 11c are molded heat insulating materials, and the side surface heat insulating material 11b is a vacuum heat insulating material.
JP 2004-251521 A

  However, in the case of such a configuration, the contact portion of the joint portion between the upper heat insulating material 11a and the lower heat insulating material 11c that are the upper and lower heat insulating materials of the hot water storage tank 2 and the side surface heat insulating material 11b that is the side heat insulating material (see FIG. 6), there is a problem that heat radiation from part A) is large. In particular, the thickness of the contact portion between the molded heat insulating material, which is the upper heat insulating material 11a and the lower heat insulating material 11c, and the vacuum heat insulating material, which is the side surface heat insulating material 11b, is different (in general, the thickness of the molded heat insulating material with poor heat insulating performance is large). When attaching a vacuum heat insulating material to a hot water storage tank, it is difficult to check the gap between the molded heat insulating material and the vacuum heat insulating material, so there may be a large gap in some cases, and there is a problem with the reliability of the heat insulating performance. is there.

  Moreover, in order to prevent the heat radiation from the contact part of a joint part, it is possible to eliminate a clearance | gap by sticking an adhesive tape etc. to this part, and to prevent heat radiation. However, in the case of the configuration as shown in FIG. 6, the surface formed by the upper heat insulating material 11a, which is a molded heat insulating material, the lower heat insulating material 11c, and the side surface heat insulating material 11b, which is a vacuum heat insulating material, has an angle of 90 degrees. Furthermore, since the contact part is circular, it takes time to completely eliminate the gap with adhesive tape, and the work is difficult. There is a problem that there is.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a highly insulated hot water storage tank unit by reducing heat loss from the hot water storage tank.

  In order to solve the above-described conventional problems, a hot water storage tank unit of the present invention includes a hot water storage tank, an upper heat insulating material disposed at an upper portion of the hot water storage tank, and a lower heat insulating material disposed at a lower portion of the hot water storage tank. And a side surface heat insulating material disposed on a side surface portion of the hot water storage tank, the side surface heat insulating material has a heat welded portion end surface which is an outer peripheral portion of a jacket material heat-sealed for vacuum-sealing. And having a configuration in which the end face of the heat-welded portion is extended or bent so as not to contact the hot water storage tank, so that the end face of the heat-welded portion is prevented from becoming a high temperature. The vacuum degree of the vacuum heat insulating material can be maintained, and the reliability of heat insulation can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water storage tank with high practicality which can suppress the amount of heat leaked from a hot water storage tank can be provided by improving the reliability of heat insulation performance.

  According to a first aspect of the present invention, there is provided a hot water storage tank, an upper heat insulating material disposed at an upper portion of the hot water storage tank, a lower heat insulating material disposed at a lower portion of the hot water storage tank, and a side surface portion of the hot water storage tank. A side surface heat insulating material, and the side surface heat insulating material has a heat welding portion end surface that is an outer peripheral portion of a jacket material heat-sealed for vacuum-sealing, and the heat welding portion end surface is connected to the hot water storage. It is characterized by a structure that extends and bends so as not to contact the tank, and it prevents the end face of the heat welding part from becoming high temperature, so that the vacuum degree of the vacuum heat insulating material can be maintained. , The reliability of insulation can be improved.

  The second invention is characterized in that the thickness of the portion of the upper heat insulating material and / or the lower heat insulating material that contacts the side surface heat insulating material is substantially the same as the thickness of the side surface heat insulating material. When the material is attached to the hot water storage tank, it is easy to check the gap between the molded heat insulating material and the vacuum heat insulating material, so that the reliability of the mounting operation and, as a result, the reliability of the heat insulating performance is improved.

  3rd invention made the length of the up-down direction of the substantially identical thickness part of an upper heat insulating material and / or a lower heat insulating material longer than the length of the up-down direction of the heat weld part end surface of a vacuum heat insulating material, It is characterized by the above-mentioned. Since the end face of the heat-welded part can be extended to substantially the same thickness part of the upper heat insulating material or the lower heat insulating material, the gap between the contact portions between the upper heat insulating material or the lower heat insulating material and the side surface heat insulating material is reduced. Heat leakage from the gap can be reduced.

  The fourth invention is characterized in that the heat welded portion end face of the vacuum heat insulating material is fixed to the substantially same thickness portion of the upper heat insulating material and / or the lower heat insulating material with an adhesive tape. Since there is no gap between the contact portions of the heat insulating material and the side surface heat insulating material, heat loss due to convection from the hot water storage tank can be prevented.

  According to a fifth aspect of the present invention, the side surface heat insulating material is divided into a plurality of vacuum heat insulating materials, the end face of the heat welding portion of the vacuum heat insulating material on the one side and / or the other side is extended toward the anti-vacuum heat insulating material, and the heat on the other side It is characterized by bending the end face of the welded part to the anti-hot water storage tank side in the direction of the vacuum heat insulating material. Since the specifications of the shape of the divided vacuum heat insulating material can all be the same, the heat insulating material is incorporated into the hot water storage tank. Work time can be shortened and work reliability can be improved.

  The sixth invention is characterized in that one end face of one of the plurality of vacuum heat insulating materials and the end face of the other end of the heat weld portion are extended or bent in the same direction, and divided vacuum Since the heat insulation material specifications are all the same and the vacuum insulation material can be incorporated into the hot water storage tank in the same direction, the work time for incorporating the heat insulation material into the hot water storage tank can be shortened and the work reliability can be improved. It becomes.

  7th invention is characterized by fixing the heat insulation part end surface which the vacuum heat insulation material extended, and the vacuum heat insulation material which touches the heat welding part end surface with the adhesive tape, and the vacuum heat insulation material which contacts, In order to prevent the heat welding part end surface of a vacuum heat insulating material from contacting directly with the surrounding air, the heat loss from a heat welding part end surface can be reduced.

  The eighth invention is characterized in that the heat welded portion end face of the vacuum heat insulating material is insulated with the heat insulating material, and the heat welded portion end face of the vacuum heat insulating material and the vacuum heat insulating material which are in contact with each other is surrounded. In order to prevent direct contact with air, heat dissipation loss from the end face of the heat welded portion can be reduced.

  A ninth invention is a heat pump water heater using the hot water storage tank unit of any one of the first to eighth inventions, wherein the heat pump water heater is provided with a highly insulated hot water storage tank unit by reducing heat loss from the hot water storage tank. Can provide.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a hot water storage type hot water supply apparatus using a hot water storage tank unit in the 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 configuration of the hot water storage type hot water supply apparatus using the conventional hot water storage tank unit of FIG. 5, the water supplied to the hot water storage tank 2 from the water supply pipe 14 is stored by the water pump 9 of the water inlet line 7. It is conveyed to the heating means 1 through the pipe 12. 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. It is formed as a hot water storage tank unit by being surrounded by the exterior body 10b and the exterior body 10c at the bottom.

  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 11a made of molded heat insulating material as the heat insulating material at the upper part of the hot water storage tank 2, the side surface heat insulating material 11b made of the vacuum heat insulating material as the heat insulating material of the side surface of the hot water storage tank 2, and the heat insulating material at the lower part of the hot water storage tank 2. As a lower heat insulating material 11c made of a molded heat insulating material.

  In addition, as a material of this molded heat insulating material, for example, a foamed resin such as foamed polypropylene or foamed polystyrene is used. Moreover, A in the figure is a part where the upper side heat insulating material 11a made of a molded heat insulating material, the lower heat insulating material 11c, and the side surface heat insulating material 11b made of a vacuum heat insulating material come into contact. And the upper heat insulating material 11a and the lower heat insulating material 11c are provided with the substantially same thickness part 18 which made the thickness of the part which contacts the side part heat insulating material 11b substantially the same as the thickness of the side surface heat insulating material 11b.

  FIG. 2 is a cross-sectional view of a general vacuum heat insulating material used in Embodiment 1 of the present invention. The core material 20 is put in the jacket material 21, the inside is evacuated, and the heat-welded end face 22, which is the outer peripheral portion of the jacket material 21, is thermally welded.

  FIG. 3 is an enlarged view of a portion B in FIG. As shown in the drawing, the vacuum heat insulating material that is the side surface heat insulating material 11 b includes a core material 20, an outer covering material 21, and a heat welding portion end face 22 that is an outer peripheral portion of the outer covering material 21. Then, the end surface of the upper heat insulating material 11a, which is substantially the same thickness as the side surface heat insulating material 11b, and the end surface of the side surface heat insulating material 11b are in contact with each other at the portion A.

  Further, the length in the vertical direction of the substantially identical thickness portion 18 is set to be longer than the length in the vertical direction of the heat weld portion end face 22. And the heat welding part end surface 22 is in contact with the surface of the substantially identical thickness part 18 of the upper heat insulating material 11a on the opposite side to the hot water storage tank 2. Further, the heat-welded end face 22 is tightly fixed to the surface of the upper heat insulating material 11a with an adhesive tape 23. Moreover, the surface of the heat weld part end surface 22 is covered with the heat weld part end surface heat insulating material 24.

  Below, operation | movement and an effect | action of the hot water storage tank unit by this Embodiment are demonstrated.

  When installing the vacuum heat insulating material which is the side surface heat insulating material 11b in the hot water storage tank 2, it is ideal that there is no gap between the side surface heat insulating material 11b and the upper heat insulating material 11a. Since the side surface heat insulating material 11b and the upper heat insulating material 11a have substantially the same thickness portion 18, the work is performed by easily confirming the degree of adhesion between the side surface heat insulating material 11b and the upper heat insulating material 11a. it can.

  Thus, since it can work by confirming the close_contact | adherence degree of the side surface heat insulating material 11b and the upper heat insulating material 11a easily, the clearance gap between the side surface heat insulating material 11b and the upper heat insulating material 11a can be decreased.

  Moreover, since the length of the substantially equal thickness portion 18 in the vertical direction is set to be longer than the vertical length of the heat weld portion end surface 22, the heat weld portion end surface of the vacuum heat insulating material that is the side surface heat insulating material 11b. 22 can be fully extended in the opposite direction to the core material 20. And since heat welding part end surface 22 and upper heat insulating material 11a can fully be stuck, heat dissipation from hot water storage tank 2 can be decreased.

  Furthermore, since the length in the vertical direction of the substantially identical thickness portion 18 is set to be longer than the length in the vertical direction of the heat weld portion end surface 22, the heat weld portion end surface of the vacuum heat insulating material that is the side surface heat insulating material 11b. Even when 22 is completely extended to the substantially identical thickness portion 18 side of the upper heat insulating material 11a which is opposite to the core material 20, the substantially identical thickness portion 18 has a region that does not contact the end face 22 of the heat welding portion. And since the said heat welding part end surface 22 can be closely_contact | adhered and fixed to the surface of the upper heat insulating material 11a with the adhesive tape 23 using this area | region, the heat radiation by the convection from the hot water storage tank 2 can be eliminated.

  Moreover, since the surface of the heat welding part end surface 22 is covered with the heat welding part end surface heat insulating material 24, the heat radiation from the heat welding part end surface 22 whose temperature is higher than that of the outer cover material 21 surface of the core part 20 is achieved. Can be reduced.

  In addition, in the said description, although the effect | action and effect of the side part heat insulating material 11b and the upper heat insulating material 11a were demonstrated, since the same effect | action and effect can be acquired also in the relationship between the side surface heat insulating material 11b and the lower heat insulating material 11c. The description is omitted.

(Embodiment 2)
FIG. 4 shows a cross-sectional view of the hot water storage tank of the hot water storage tank unit in the second embodiment of the present invention. In FIG. 4, the side surface heat insulating material 11b is divided into two in the vertical direction, which are 11b1 and 11b2, respectively.

  And the thermal welding part end surface 22 of the upper side of these divided | segmented side surface part heat insulating materials 11b1 and 11b2 is extended in the opposite direction to the core material 20, and the other side thermal welding part end surface 22 is the direction of the core material 20, and hot water storage. The tank 2 is bent to the opposite side. And since the structure of the contact part of the side part heat insulating material 11b1 located above and the upper heat insulating material 11a is the same as that of the case of FIG. 3, description is abbreviate | omitted.

  Further, the substantially equal thickness portion 18 of the lower heat insulating material 11c and the side surface heat insulating material 11b2 positioned below are fixed with an adhesive tape 23, and the bent end face 22 of the welded portion is an upper surface of the adhesive tape. Therefore, it is configured to be thermally insulated by the heat welding portion end face heat insulating material 24.

  Moreover, in the contact part of the side part heat insulating material 11b1 located above and the side part heat insulating material 11b2 located below, the heat welding part end surface 22 of the upper side of the side part heat insulating material 11b2 located below is the core material 20 Is fixed to the upper side heat insulating material 11b1 by an adhesive tape 23 that extends in the opposite direction. Further, the stretched end portion 22 of the heat welded portion is insulated from the adhesive tape 23 by the heat welded portion end surface heat insulating material 24.

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

  Since substantially the same thickness portion 18 of the lower heat insulating material 11c and the side surface heat insulating material 11b2 positioned below are fixed by the adhesive tape 23, heat radiation due to convection from the hot water storage tank 2 can be prevented.

  Moreover, in the contact part of the side part heat insulating material 11b1 located above and the side part heat insulating material 11b2 located below, the heat welding part end surface 22 of the side part heat insulating material 11b2 located below is opposite to the core material 20 Since it is fixed to the upper side heat insulating material 11b1 by the stretched adhesive tape 23, it is possible to prevent heat dissipation due to convection from the hot water storage tank 2 at the contact portion between the upper and lower side heat insulating materials 11b1 and 11b2.

  Furthermore, since the heat welding part end surface 22 is heat-insulated with the heat welding part end surface heat insulating material 24, heat radiation from the heat welding part end surface 22 having a higher temperature than the outer cover material surface of the core part is reduced. can do.

  Moreover, since the extending direction and the bending direction of the respective heat welded portion end faces 22 of the upper and lower side surface heat insulating materials 11b1 and 11b2 are the same, when the upper and lower side surface heat insulating materials 11b1 and 11b2 are attached to the hot water storage tank 2, they are attached. The user can make the right and left without mistakes, the mounting reliability is improved, and the upper and lower side surface heat insulating materials 11b1 and 11b2 can have the same specifications, so the management as a part is reduced and the cost is also reduced. .

  In addition, in FIG. 4 of the said description, although the side part heat insulating material was divided into 2 up and down, it is good also as 3 or more divisions. Since the operation and effect in this case are the same, the description thereof is omitted.

  Further, in FIG. 4, the heat welded portion end surface 22 on the upper side of the side surface heat insulating materials 11 b 1 and 11 b 2 extends in the direction opposite to the core material 20, and the other heat welded portion end surface 22 is in the direction of the core material 20. Although it is set as the structure bent to the opposite side to the tank 2, the thermal welding part end surface 22 of the downward side of the side part heat insulating materials 11b1 and 11b2 is extended in the opposite direction to the core material 20, and the thermal welding part end surface 22 of the other side is Even if the structure is bent in the direction of the core material 20 and on the side opposite to the hot water storage tank 2, the same operation and effect as in FIG.

  In both of the first and second embodiments described above, the hot weld storage end face 22 is not in contact with the hot water storage tank 2, whether the thermal weld end face 22 of the vacuum heat insulating material is extended or bent. It is configured to extend or bend to the opposite side of the tank 2. When the temperature of the end face 22 of the heat welded portion increases, the sealing effect may be reduced. For this reason, in the first and second embodiments, the temperature of the end face of the heat welded portion is prevented from increasing. The vacuum degree of the vacuum heat insulating material can be maintained, and the reliability of heat insulation can be improved.

  INDUSTRIAL APPLICABILITY The hot water storage tank unit according to the present invention can provide a space-saving hot water storage tank with little heat dissipation loss, and can be used for applications such as an electric water heater or a hot water storage tank unit of a heat pump water heater.

The block diagram of the hot water storage type hot water supply apparatus which uses the hot water storage tank unit in Embodiment 1 of this invention Sectional drawing of the vacuum heat insulating material in Embodiment 1 of this invention Partial enlarged view of the hot water storage tank unit Sectional drawing of the hot water storage tank in Embodiment 2 of this invention Configuration diagram of a hot water storage hot water supply device having a conventional hot water storage tank unit Cross section of conventional hot water storage tank

Explanation of symbols

2 Hot water storage tank 4 Hot water supply upper pipe (pipe)
7 Inlet pipe (pipe)
8 Hot water pipeline (piping)
DESCRIPTION OF SYMBOLS 10a Exterior body 10b Exterior body 10c Exterior body 11a Upper heat insulating material 11b Side surface heat insulating material 11c Lower heat insulating material 14 Water supply piping (pipe)
18 Substantially the same thickness part 21 Outer material 22 Thermal weld end face

Claims (9)

A hot water storage tank, an upper heat insulating material disposed at an upper portion of the hot water storage tank, a lower heat insulating material disposed at a lower portion of the hot water storage tank, and a side surface heat insulating material disposed at a side surface portion of the hot water storage tank; The side surface heat insulating material has a heat welded portion end surface which is an outer peripheral portion of a jacket material heat-welded for vacuum-sealing so that the end surface of the heat welded portion does not contact the hot water storage tank. Hot water storage tank unit characterized by a structure that extends and bends. 2. The hot water storage tank unit according to claim 1, wherein the thickness of a portion of the upper heat insulating material and / or the lower heat insulating material that contacts the side surface heat insulating material is substantially the same as the thickness of the side surface heat insulating material. The length of the up-down direction of the substantially identical thickness part of an upper heat insulating material and / or a lower heat insulating material was made longer than the length of the up-down direction of the heat weld part end surface of a vacuum heat insulating material. Hot water storage tank unit. The hot water storage tank unit according to claim 2 or 3, wherein an end surface of the heat-welded portion of the vacuum heat insulating material is fixed to an approximately equal thickness portion of the upper heat insulating material and / or the lower heat insulating material with an adhesive tape. The side surface heat insulating material is divided into a plurality of vacuum heat insulating materials, the one end and / or the other end of the heat insulating portion of the vacuum heat insulating material is extended in the direction of the anti-vacuum heat insulating material, and the other end of the heat insulating portion is vacuum insulated. The hot water storage tank unit according to any one of claims 1 to 4, wherein the hot water storage tank unit is bent toward the opposite hot water storage tank side in the material direction. 6. The hot water storage tank unit according to claim 5, wherein one end face of one of the plurality of vacuum heat insulating members and an end face of the other end of the heat welding portion are extended or bent in the same direction. The hot water storage tank unit according to claim 5 or 6, wherein an end face of the heat-welded portion extended by the vacuum heat-insulating material and a vacuum heat-insulating material in contact with the end face of the heat-welded portion are fixed with an adhesive tape. The hot water storage tank unit according to any one of claims 1 to 7, wherein an end face of the heat insulating portion of the vacuum heat insulating material is insulated with a heat insulating material. A heat pump water heater using the hot water storage tank unit according to any one of claims 1 to 8.