JP2014085090A - Hot water storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage tank capable of uniformizing a temperature of high-temperature water inside of the hot water storage tank from an upper portion to a lower portion of the hot water storage tank.SOLUTION: A hot water storage tank 1 includes: a hot water storage tank body 11 having a hot water inflow port 21 and a hot water outflow port 22 at its lower portion; and a projecting space formation portion 12 disposed on a position above the hot water inflow port 21 at a position inside of the hot water storage tank body 11, and defining a part of the space in the hot water storage tank body 11 as a space 124 having the upward projecting shape. The projecting space formation portion 12 is disposed in several stages in a vertical direction, and a peripheral edge portion 126 of the projecting space formation portion 12 of one stage, is positioned in a region surrounded by a peripheral edge portion 126 of the other projecting space formation portion 12 adjacent to the projecting space formation portion 12 of one stage in the vertical direction, when observed in the vertical direction.

Description

  The present invention relates to a hot water storage tank for temporarily storing high-temperature water.

  In the high temperature fuel cell system, hydrogen gas is supplied to the fuel electrode of the high temperature fuel cell, and air is supplied to the air electrode. Then, the supplied hydrogen and oxygen in the air chemically react to generate power. Hydrogen that has not contributed to power generation by chemical reaction in the high-temperature fuel cell becomes anode off-gas. Further, oxygen that has not contributed to power generation by a chemical reaction becomes cathode off-gas. The anode off-gas and cathode off-gas are discharged as off-gas.

  When the fuel cell is composed of a high-temperature fuel cell such as a SOFC (solid oxide fuel cell), a high-temperature off-gas of about 200 ° C. to 800 ° C. is discharged from the fuel cell. It has been known that low temperature water is heated to high temperature water using a high temperature off gas using a heat exchanger. The high temperature water is temporarily stored, and the stored high temperature water is used when the high temperature water is required. A hot water storage tank for temporarily storing such high-temperature water is known (see Patent Document 1).

JP 2002-364923 A

  In the hot water storage tank described in the above publication, a water supply pipe is connected to the lower part of the hot water storage tank, the water whose temperature has been lowered is located at the lower part, and the hot water is located at the upper part. A hot water supply pipe is connected to the upper part of the hot water storage tank so that hot water can be taken out from the upper part. Moreover, the heat insulation shielding board which suppresses the transfer of the heat between the high temperature hot water of an upper part and the water to which the temperature of the lower part fell is provided, and the hot water temperature fall of high temperature hot water is prevented as much as possible. However, in such a configuration, since the temperature of the hot water at the upper part of the hot water storage tank becomes extremely high, the hot water having a high temperature may boil and generate steam. Moreover, it is difficult to make the high temperature water inside the hot water storage tank a uniform temperature above and below the hot water storage tank. In order to make it uniform, a stirrer, a heater, etc. are needed.

  An object of this invention is to provide the hot water storage tank which can make the high temperature water inside a hot water storage tank into uniform temperature from the upper part of a hot water storage tank to a lower part.

  The present invention relates to a hot water storage tank body having a hot water inlet and a hot water outlet formed in a lower part, and a position inside the hot water tank main body and a position above the hot water inlet. The present invention relates to a hot water storage tank that includes a convex space forming section that partitions a part of the inner space into a space having a convex shape extending upward.

  In addition, the convex space forming portion is provided in a plurality of stages in the vertical direction, and when viewed in the vertical direction, the peripheral portion of the convex space forming portion in one step is the convex space in the one step in the vertical direction. It is preferable that it is located in the area | region enclosed by the peripheral part of the said other convex-shaped space formation part adjacent to a formation part.

  Moreover, it is preferable that the said convex shape space formation part has a curved surface part comprised by the curved surface which has convex shape upwards. Moreover, it is preferable that the said convex-shaped space formation part has a disk part and the peripheral wall extended respectively upwards and downwards from the said disk part over the perimeter of the said disk part.

  Moreover, at least one notch is formed in a part of the peripheral wall located above the disk part and / or a part of the peripheral wall located below the disk part. It is preferable.

  In addition, the convex space forming portion is provided in a plurality of stages in the vertical direction, and when viewed in the vertical direction, the peripheral portion of the convex space forming portion in one step is the convex space in the one step in the vertical direction. One of the pair of convex space forming portions adjacent to each other in the vertical direction is located in a region surrounded by the peripheral edge of the other convex space forming portion adjacent to the forming portion, and the other is constituted by an annular member. The curved member or the disk-shaped member, and the annular member has an inner peripheral circular end edge and an outer peripheral circular end edge having a coaxial positional relationship when viewed in the vertical direction, and the outer peripheral circular end. It is preferable that a portion between the inner peripheral circular end edge and the outer peripheral circular end edge in the radial direction of the edge is formed by a curved surface that curves upward.

  Moreover, it is preferable to provide the pipe | tube connected to the said convex-shaped space formation part and communicating with the space which has the convex shape toward the upper part divided by the said convex-shaped space formation part. Moreover, it is preferable to provide the extension part extended inward of the space in the said hot water storage tank main body from the inner surface of the said hot water storage tank main body.

  Moreover, it is preferable to have the cold water supply port which is formed in the upper part of the said hot water storage tank main body, and can supply cold water. The hot water inlet is preferably supplied with hot water heated by the heat of off-gas of the fuel cell.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water storage tank which can make high temperature water inside a hot water storage tank into uniform temperature from the upper part of a hot water storage tank to a lower part can be provided.

It is sectional drawing which shows the hot water storage tank 1 by 1st Embodiment of this invention. It is a top view which shows the convex-shaped space formation part 12 of the hot water storage tank 1 by 1st Embodiment of this invention. It is sectional drawing which shows the flow of the water in the hot water storage tank 1 by 1st Embodiment of this invention. It is a figure which shows 12 A of convex-shaped space formation parts of the hot water storage tank by 2nd Embodiment of this invention, (a) is a side view, (b) is a top view. It is a figure which shows the convex-shaped space formation part 12B of the hot water storage tank by 3rd Embodiment of this invention, (a) is a side view, (b) is a perspective view. It is a figure which shows 12 C of convex shape space formation parts of the hot water storage tank by 4th Embodiment of this invention, (a) is a perspective view, (b) is sectional drawing cut along the AA line.

  Hereinafter, a hot water storage tank according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a hot water storage tank 1 according to a first embodiment of the present invention. FIG. 2 is a plan view showing the convex space forming part 12 of the hot water storage tank 1 according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view showing the flow of water in the hot water storage tank 1 according to the first embodiment of the present invention.

  The hot water storage tank 1 includes a hot water storage tank main body 11, a convex space forming part 12, a pipe 13, and an extension part 14.

  As shown in FIG. 1, the hot water storage tank body 11 is constituted by a hollow container extending in the vertical direction. A hot water inflow pipe 21 as a hot water inlet is connected to the lower end of the hot water tank main body 11. The upstream side of the high temperature water inflow pipe 21 is connected to a heat exchanger (not shown) connected to an offgas discharge line for discharging offgas of a fuel cell (not shown) and a water supply line (not shown). Yes. The water heated by the heat of the off-gas of the fuel cell in the heat exchanger becomes hot water (high temperature water) and is supplied into the hot water storage tank body 11 through the high temperature water inflow pipe 21.

  A hot water outlet pipe 22 serving as a hot water outlet is connected to the lower end of the hot water storage tank body 11. The hot water in the hot water storage tank body 11 can flow out of the hot water storage tank body 11 through the high temperature water outflow pipe 22. A low temperature water inflow pipe 23 serving as a cold water supply port is connected to the upper end of the hot water tank main body 11. Low temperature water (for example, tap water, groundwater) can be supplied into the hot water tank main body 11 through the low temperature water inflow pipe 23.

  Eleven convex space forming portions 12 having the same shape are provided at positions inside the hot water storage tank main body 11, and as shown in FIG. 1, the sections cut by planes parallel to the vertical direction are U-shaped. It is comprised by the member of. In FIG. 1, only seven convex space forming portions 12 appear.

  The convex space forming part 12 includes a disk part 121 and a peripheral wall 122 each made of a material having high thermal conductivity. The peripheral wall 122 extends downward from the disk portion 121 over the entire circumference of the disk portion 121 and has an annular shape. The upper surface and the lower surface of the disk part 121 of the convex space forming part 12 have a positional relationship parallel to the horizontal direction. The opening 123 of the convex space forming part 12 opens downward. Therefore, the convex space forming part 12 partitions a part of the space in the hot water storage tank main body 11 into a space 124 having a convex shape directed upward.

  As shown in FIG. 1, the convex space forming part 12 is arranged so as to form a five-layered structure in the vertical direction. Specifically, the convex space forming portion 12 located at the uppermost stage is disposed at the center of the hot water storage tank main body 11. As shown in FIG. 2, the four convex space forming portions 12 located in the step immediately below the uppermost step (the second step from the top) have a part of the convex shape space forming portion 12 in the uppermost step in plan view. It arrange | positions so that it may overlap with a part of convex-shaped space formation part 12 located in.

  Similarly, one convex space forming portion 12 located in the third step from the top has four convex shape space forming portions in which a part of the convex shape space forming portion 12 is located in the second step from the top in plan view. 12 are arranged so as to overlap a part of 12. The same applies to the fourth stage from the top and the fifth stage from the top.

  That is, as shown in FIG. 2, the peripheral portion 126 of the first step convex space forming portion 12 is adjacent to the first step convex space forming portion 12 in the vertical direction in a plan view as viewed in the vertical direction. It is located in the area surrounded by the peripheral edge 126 of the other convex space forming part 12. The lowermost convex space forming part 12 is arranged at a position above the high-temperature water inflow pipe 21 as a hot water inlet.

  Four tubes 13 are provided. As shown in FIG. 1, the upper end of each pipe 13 is fixed to the upper wall of the hot water tank body 11, and the inside of the pipe 13 communicates with the outside of the hot water tank body 11. In FIG. 1, only two tubes 13 appear. The four tubes 13 respectively penetrate the convex space forming portion 12 located at the uppermost stage from the upper end portion toward the lower end portion. Below that, one tube 13 passes through each of the four convex space forming portions 12 located in the second stage from the top.

  Below that, the four tubes 13 respectively penetrate the convex space forming part 12 located in the third stage from the top. Below that, one tube 13 passes through each of the four convex space forming portions 12 located in the fourth stage from the top. Below that, the four pipes 13 respectively penetrate the convex space forming part 12 located at the lowermost stage, and the lower ends of the four pipes 13 are fixed to the convex shaped space forming part 12 located at the lowermost stage. ing. Accordingly, the four tubes 13 are connected to all the convex space forming portions 12.

  Each of the four tubes 13 is formed with a tube opening 125 that opens into a space 124 having a convex shape that extends upward and is partitioned by each convex space forming portion 12. For this reason, the inside of the pipe 13 communicates with the space 124.

  The extension 14 extends from the inner surface of the hot water tank main body 11 to the inside of the space in the hot water tank main body 11. The extending part 14 is formed so as to make one round of the inner surface in the circumferential direction of the hot water tank main body 11 and has an annular shape. The three extending portions 14 are provided in the vertical direction. The protruding portion 14 is located at the position facing the convex shape space forming portion 12 located at the uppermost level in the horizontal direction and the convex shape located at the third level from the top in the horizontal direction. They are arranged at a position facing the shape space forming portion 12 and a position facing the convex space forming portion 12 positioned at the lowest level in the horizontal direction.

According to the hot water storage tank 1 according to the first embodiment, the following effects can be exhibited.
The hot water storage tank 1 has a hot water storage tank body 11 having a hot water inlet pipe 21 as a hot water inlet and a hot water outlet pipe 22 as a hot water outlet formed at the lower end, and a position inside the hot water tank body 11. The convex space forming portion 12 is arranged at a position above the hot water inflow pipe 21 serving as a hot water inlet and divides a part of the space in the hot water storage tank main body 11 into a space 124 having a convex shape upward. With.

  The hot water whose temperature has decreased after flowing into the hot water storage tank body 11 from the hot water inlet pipe 21 serving as the hot water inlet and moving to the upper part of the hot water storage tank body 11 is shown in FIG. 3 due to the density difference due to the temperature difference. As indicated by the arrow, the hot water storage tank body 11 moves toward the lower part. On the other hand, high temperature hot water flowing into the hot water storage tank main body 11 from the high temperature water inflow pipe 21 serving as the hot water inlet moves toward the upper part of the hot water storage tank main body 11 due to the density difference caused by the temperature difference. At this time, the high-temperature water having a high temperature accumulates in a space 124 having a convex shape directed upward, which is partitioned and formed by the convex-shaped space forming unit 12, as indicated by a one-dot chain line in FIG.

  The heat of the high-temperature water having a high temperature accumulated in the convex space 124 is transmitted to the low-temperature high-temperature water located around the high-temperature water, and heat exchange is performed. Further, the heat of the high-temperature water having a high temperature accumulated in the space 124 having the convex shape is transmitted to the high-temperature water having a lowered temperature through the convex-shaped space forming unit 12 to perform heat exchange. As a result, the high-temperature water whose temperature has been lowered is heated, the high-temperature water whose temperature is high is cooled, and the temperature distribution of the high-temperature water stored in the hot water storage tank body 11 is biased up and down in the hot water storage tank body 11. Can be suppressed.

  In addition, the convex space forming portion 12 is provided in five steps in the vertical direction, and the peripheral portion 126 of the one step convex space forming portion 12 is formed in the vertical direction as viewed in the vertical direction. It is located in a region surrounded by the peripheral edge 126 of another convex space forming part 12 adjacent to the part 12.

For this reason, when the high temperature hot water having a high temperature moves toward the upper part of the hot water storage tank body 11 due to the density difference due to the temperature difference, it is more surely partitioned and formed by the convex space forming part 12. It can be more reliably collected in the space 124 having a convex shape toward the top. In addition, when high-temperature water having a high accumulated temperature overflows from the space 124, it can be reliably accumulated in the space 124 having a convex shape directed upward, which is partitioned and formed by the convex-shaped space forming part 12 immediately above. it can. Thereby, it can prevent that the temperature of the upper part of the hot water storage tank main body 11 becomes extremely high, and can suppress that high temperature water with a high temperature boils and generation | occurrence | production of a vapor | steam.
Moreover, when high-temperature water whose temperature has decreased due to the difference in density due to the temperature difference moves toward the lower part of the hot water storage tank body 11, the temperature decreases along the disk part 121 of the convex space forming part 12. Heat exchange can be performed more effectively by moving the high-temperature water more reliably.

  In addition, since the pipe 13 is connected to the convex space forming part 12 and communicates with the space 124 having the upward convex shape defined by the convex space forming part 12, a plurality of pipes 13 are provided in the space inside the hot water storage tank body 11. The convex space forming part 12 can be arranged. Furthermore, air is prevented from accumulating in the space 124 having the upward convex shape defined by the convex space forming portion 12 at the initial stage when high temperature water starts to flow into the hot water storage tank body 11. be able to.

  Moreover, since it has the extension part 14 extended inward of the space in the hot water storage tank main body 11 from the inner surface of the hot water storage tank main body 11, the high temperature which moves by the density difference resulting from a temperature difference in the inner surface vicinity of the hot water storage tank main body 11 Water can flow toward the convex space forming part 12.

  Moreover, it has the low temperature water inflow pipe 23 formed in the upper part of the hot water storage tank main body 11 as a cold water supply port which can supply cold water. For this reason, when a required amount of low-temperature water flows into the hot water storage tank main body 11 through the low-temperature water inflow pipe 23, the hot water stored in the hot water storage tank main body 11 is used without using a stirrer, a pump, a heater or the like. It is possible to suppress the temperature distribution from being biased up and down in the hot water storage tank main body 11. For this reason, the cost which provides a stirrer, a pump, a heater, etc., and the cost concerning the energy which drives these can be omitted.

  Since hot water heated by the heat of the off-gas of the fuel cell is supplied to the high-temperature water inflow pipe 21 serving as the hot water inlet, the thermal energy of the off-gas of the fuel cell is stored in the hot water storage tank body 11 in the form of high-temperature water. be able to.

Next, a convex space forming part 12A of a hot water storage tank according to a second embodiment of the present invention will be described with reference to FIG. 4A and 4B are views showing a convex space forming part 12A of a hot water storage tank according to a second embodiment of the present invention, where FIG. 4A is a side view and FIG. 4B is a plan view.
In the hot water storage tank according to the second embodiment, the shape of the convex space forming portion 12A is different from the shape of the convex space forming portion 12 of the hot water storage tank 1 according to the first embodiment. About the structure of those other than this, since it is the same as the hot water storage tank 1 which concerns on 1st Embodiment, description is abbreviate | omitted.

As shown in FIG. 4, the convex space forming portion 12 </ b> A is configured by an arcuate curved member. The convex space forming portion 12A has a shape obtained by cutting a part of a hollow sphere inside with a flat surface.
Specifically, when viewed from the side, the convex space forming portion 12A has a curved surface portion 121A constituted by an arc-shaped curved surface having a convex shape upward as shown in FIG. In plan view, the convex space forming portion 12A has a circular shape as shown in FIG. The eleven convex shape space forming portions 12A having such a shape have the same positional relationship as the convex shape space forming portion 12 of the first embodiment so that the opening 123A faces downward. It arrange | positions in the main body 11 (refer FIG. 1), and each pipe | tube 13 (refer FIG. 1) penetrates.

  Since the convex space forming part 12A has such a configuration, it is easy to disperse (diffuse) the low-temperature high-temperature water moving from above along the upper surface of the convex space forming part 12A. can do. As a result, it is possible to easily control the flow of high-temperature water having a low temperature from below.

Next, a convex space forming part 12B of a hot water storage tank according to a third embodiment of the present invention will be described with reference to FIG. 5A and 5B are views showing a convex space forming part 12B of a hot water storage tank according to a third embodiment of the present invention, wherein FIG. 5A is a side view and FIG. 5B is a perspective view.
In the hot water storage tank according to the third embodiment, the shape of the convex space forming portion 12B is different from the shape of the convex space forming portion 12 of the hot water storage tank 1 according to the first embodiment. About the structure of those other than this, since it is the same as the hot water storage tank 1 which concerns on 1st Embodiment, description is abbreviate | omitted.

  As shown in FIG. 5, the convex space forming part 12 </ b> B is configured by a disk-shaped member. The disk-shaped member has a disk part 121B and a peripheral wall 122B. The peripheral wall 122B extends upward and downward from the disk part 121B over the entire circumference of the disk part 121B. One notch 127 is formed in each of a part of the peripheral wall 122B located above the disk part 121B and a part of the peripheral wall 122B located below the disk part 121B. The notches 127 are formed so as to form a pair in a positional relationship having a diameter on the peripheral surface of the disk portion 121B.

  The eleven convex space forming portions 12B having such a shape are arranged so that the upper surface and the lower surface of the disk portion 121B have a positional relationship parallel to the horizontal direction, and the convex space forming portion of the first embodiment. 12 is disposed in the hot water tank main body 11 (see FIG. 1) with the same positional relationship as 12 and is penetrated by each pipe 13 (see FIG. 1).

  Since the convex space forming part 12B has such a configuration, it is possible to store high-temperature water whose temperature has decreased above the disk part 121B. Moreover, high temperature water with high temperature can be stored below the disk part 121B. As a result, heat exchange can be performed more reliably. Moreover, since the notch 127 is formed, it is possible to make the high-temperature water flow smoothly into and out of the space above the disk part 121B and the space below the disk part 121B.

Next, a convex space forming part 12C of a hot water storage tank according to a fourth embodiment of the present invention will be described with reference to FIG. 6A and 6B are views showing a convex space forming part 12C of a hot water storage tank according to a fourth embodiment of the present invention, where FIG. 6A is a perspective view and FIG. 6B is a cross-sectional view taken along line AA. is there.
In the hot water storage tank according to the fourth embodiment, the shape of the convex space forming portion 12C is different from the shape of a part of the convex space forming portion 12A of the hot water storage tank according to the second embodiment. Since it is the same as that of the hot water storage tank which concerns on 2nd Embodiment about another structure, description is abbreviate | omitted.

  The convex space forming part 12A in the uppermost stage, the third stage from the top, and the lowermost stage is configured by the convex space forming part 12A of the hot water storage tank according to the second embodiment. The convex space forming portion 12C in the second step from the top and the fourth step from the top is formed of an annular member. That is, one of a pair of convex space forming portions adjacent in the vertical direction is configured by a convex space forming portion 12C made of an annular member, and the other is configured by a convex space forming portion 12A as a curved surface member. Yes.

  As shown in FIG. 6, the convex space forming portion 12 </ b> C has an inner peripheral circular end edge 121 </ b> C and an outer peripheral circular end edge 122 </ b> C having a coaxial positional relationship when viewed in the vertical direction. A portion between the inner peripheral circular end edge 121C and the outer peripheral circular end edge 122C in the radial direction of the outer peripheral circular end edge 122C is configured by a curved surface that curves upward. Therefore, the part shown with the dashed-dotted line in Fig.6 (a) is located in the uppermost part in 12 C of convex shape space formation parts. As shown in FIG. 6B, the cross section of the convex space forming portion 12C cut by a plane including the axis of the convex space forming portion 12C has one end constituted by an inner circumferential edge 121C and the other end outer periphery. It has a U-shape formed by the circular end edge 122C and opening downward.

  Such convex space forming portions 12C are arranged in a positional relationship in which the axial centers coincide with each other in the vertical direction. In plan view, the peripheral portion of the uppermost, third from the top, and lowermost convex space forming portion 12A overlaps the portion of the inner circumferential edge 121C of the convex space forming portion 12C. Be placed.

  The present invention is not limited to the above embodiment, and can be modified within the technical scope described in the claims. For example, although the hot water inflow pipe 21 as a hot water inlet and the hot water outflow pipe 22 as a hot water outlet are connected to the lower end of the hot water storage tank main body 11, it is not limited to the lower end. The high temperature water inflow pipe 21 as the hot water inlet may be positioned below the lowermost convex space forming portion and may be connected to the lower portion of the hot water storage tank body 11. The hot water outlet pipe 22 as the hot water discharge port only needs to be connected to the lower part of the hot water storage tank body 11 and may be disposed above the lowermost convex space forming part 12. 11 is preferably connected to the lowermost end.

  Moreover, although the low temperature water inflow pipe 23 as a cold water supply port was connected to the upper end part of the hot water storage tank main body 11, it is not limited to an upper end part. The position where the low temperature water inflow pipe 23 is connected may be the upper part of the hot water storage tank body 11.

  In addition, the convex space forming portion 12A in the second embodiment is configured by an arcuate curved member, and the convex space forming portion 12A is obtained by cutting a part of a sphere having a hollow inside in a plane. Although it has a shape, it is not limited to an arcuate curved surface shape, and may be a curved surface having a convex shape.

  Further, the convex space forming portion 12A in the second embodiment is all configured by an arcuate curved member, but is not configured by an arcuate curved member, and at least one of them is an arcuate curved member. Or it may be comprised by the member which has a curved surface which has a shape which becomes convex upwards. In other words, all the convex space forming portions do not have to have the same shape. Similarly, also about the convex-shaped space formation part in 1st Embodiment and 3rd Embodiment, all the convex-shaped space formation parts do not need to have the same shape.

  Further, in the third embodiment, a part of the peripheral wall 122B located above the disk part 121B and a part of the peripheral wall 122B located below the disk part 121B of the convex space forming part 12B. Although one notch 127 is formed, it is not limited to this configuration. For example, the notch 127 may not be formed, and the notch 127 is a part of the peripheral wall 122B positioned above the disk part 121B or the peripheral wall positioned below the disk part 121B. It may be formed in any one part of 122B.

  Further, in the hot water storage tank according to the fourth embodiment, the convex space forming part 12A at the top, the third from the top, and the bottom is the convex space forming part 12A of the hot water tank according to the second embodiment. However, the present invention is not limited to this. For example, the uppermost, third from the top, and lowermost convex space forming portion may be configured by the convex shape space forming portion 12 in the first embodiment, and the convex shape space in the third embodiment. You may be comprised by the formation part 12B.

  Further, the convex space forming portion is not limited to the configuration of the above-described embodiment. Any part of the space inside the hot water storage tank body 11 may be divided into a space having a convex shape that extends upward. Moreover, although the convex shape space forming part is provided with a plurality of stages in the vertical direction, it may not be a plurality of stages, and may be configured with only one.

  Moreover, the pipe | tube 13 does not need to be provided. If the space 124 having an upwardly convex shape defined by the convex space forming portion 12 has a configuration in which air does not accumulate at an initial stage when high-temperature water has started to flow into the hot water storage tank body 11. Good. Moreover, the extension part 14 does not need to be provided. In addition, the water heated by the heat of the off-gas of the fuel cell in the heat exchanger becomes hot water (high temperature water) and is supplied into the hot water storage tank main body 11 through the high temperature water inflow pipe 21. It is not limited to.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 11 Hot water storage tank main body 12, 12A, 12B, 12C Convex-shaped space formation part (a curved surface member, a disk-shaped member, an annular member)
13 Pipe 14 Extension part 21 Hot water inflow pipe (hot water inlet)
22 Hot water outlet pipe (hot water outlet)
23 Low-temperature water inlet pipe (cold water supply port)
121A Curved surface portion 121B Disc portion 121C Inner circumference circular edge 122B Perimeter wall 122C Outer circumference circle edge 126 Perimeter portion 127 Notch

Claims (10)

A hot water storage tank body formed with a hot water inlet and a hot water outlet at the bottom;
A convex space that is disposed at a position inside the hot water tank main body and above the hot water inlet, and divides a part of the space in the hot water tank main body into a space having a convex shape that goes upward. A hot water storage tank comprising a forming part. The convex space forming part is provided in a plurality of stages in the vertical direction,
When viewed in the vertical direction, the peripheral edge of the convex space forming part on one level is surrounded by the peripheral edge of the convex space forming part adjacent to the convex space forming part on the one level in the vertical direction. The hot water storage tank according to claim 1, wherein the hot water storage tank is located in a region to be stored.   The hot water storage tank according to claim 1 or 2, wherein the convex space forming portion includes a curved member having a curved surface portion formed by a curved surface having a convex shape upward.   The said convex-shaped space formation part is provided with the disk-shaped member which has a disk part and a peripheral wall each extended to the upper direction and the downward direction from the said disk part over the perimeter of the said disk part. Hot water storage tank.   At least one notch is formed in a part of the peripheral wall located above the disk part and / or a part of the peripheral wall located below the disk part. 4. A hot water storage tank according to 4. The convex space forming part is provided in a plurality of stages in the vertical direction,
When viewed in the vertical direction, the peripheral edge of the convex space forming part on one level is surrounded by the peripheral edge of the convex space forming part adjacent to the convex space forming part on the one level in the vertical direction. Located in the area
One of the pair of convex space forming portions adjacent in the vertical direction is configured by an annular member, and the other is configured by the curved surface member or the disk-shaped member,
The annular member has an inner peripheral circular end edge and an outer peripheral circular end edge having a coaxial positional relationship when viewed in the vertical direction, and the inner peripheral circular end edge and the outer peripheral end in the radial direction of the outer peripheral circular end edge The hot water storage tank according to any one of claims 3 to 5, wherein a portion between the circular end edges is formed by a curved surface that curves upward.   The hot water storage tank according to any one of claims 1 to 6, further comprising a pipe connected to the convex space forming part and communicating with a space having an upward convex shape defined by the convex space forming part.   The hot water storage tank in any one of Claims 1-7 provided with the extension part extended inward of the space in the said hot water storage tank main body from the inner surface of the said hot water storage tank main body.   The hot water storage tank according to any one of claims 1 to 8, further comprising a cold water supply port formed at an upper portion of the hot water storage tank body and capable of supplying cold water.   The hot water storage tank according to any one of claims 1 to 9, wherein hot water heated by heat of off-gas of the fuel cell is supplied to the hot water inlet.

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