JP2020148391A - Hot water storage type water heater - Google Patents

Abstract

To provide a hot water storage type water heater advantageous for preventing water in a hot water storage tank from being stirred.SOLUTION: A hot water storage type water heater comprises: a hot water tank which has a bottom wall 4a, a peripheral wall at a position higher than the bottom wall 4a, and a through hole on the peripheral wall; a water supply pipe 6 which is extended from an outside of the hot water storage tank to an inside thereof through the through hole; and a baffle structure 7 which is arranged on a bottom section inside the hot water storage tank. The water supply pipe 6 has a tip section 6b provided with at least one water outlet 6c. The baffle structure 7 has a wall covering lateral and upper sides of the tip section 6b of the water supply pipe 6. Water flows through the at least one water outlet 6c toward an inner wall face of the baffle structure 7. A flow direction of water through the at least one water outlet 6c is vertically upward, horizontal or obliquely upward with respect to a horizontal plane.SELECTED DRAWING: Figure 2

Description

The present invention relates to a hot water storage type water heater.

In the conventional hot water storage type water heater disclosed in Patent Document 1 below, the water supply pipe arranged at the lower part of the hot water storage tank and the front of the discharge port of the water supply pipe are orthogonal to the water discharge direction of the discharge port. It is provided with a buffer plate arranged in the water heater plate, and a substantially tubular water pressure regulating cylinder having an opening facing downward so as to cover the discharge port and the buffer plate.

JP-A-2005-351777

As shown in FIG. 3 of Patent Document 1, in the hot water storage type water heater of Patent Document 1, since a water flow flows downward from the opening of the water pressure regulating cylinder, the water flow hits the bottom wall of the hot water storage tank and is bounced up. .. Since the water in the hot water storage tank is agitated by the rising water flow, it is difficult to prevent the temperature stratification in the hot water storage tank from being disturbed.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a hot water storage type water heater which is advantageous in suppressing agitation of water in a hot water storage tank.

The hot water storage type water supply machine according to the present invention has a hot water storage tank having a bottom wall, a peripheral wall located higher than the bottom wall, and a through hole provided in the peripheral wall, and hot water is stored from the outside of the hot water storage tank through the through hole. It comprises a water supply pipe extending into the inside of the tank and a baffle structure arranged at the bottom of the hot water storage tank, the water supply pipe has a tip having at least one water outlet formed, and the baffle structure is , Has a wall that covers the tip of the water supply pipe from the side and above, and the direction in which the water flow flows from at least one water outlet toward the inner wall surface of the baffle structure and the water flow flows out from at least one water outlet. , Vertically upward, horizontally, or diagonally above the horizontal plane.

According to the present invention, it is possible to provide a hot water storage type water heater which is advantageous in suppressing agitation of water in a hot water storage tank.

It is a schematic cross-sectional side view of the hot water storage tank provided in the hot water storage type water heater 1 by Embodiment 1. FIG. FIG. 5 is a perspective view showing a bottom wall, a water supply pipe, and a baffle structure included in the hot water storage type water heater 1 according to the first embodiment. It is a perspective view which shows the state just before inserting a water supply pipe into an insertion port in an assembly work.

Hereinafter, embodiments will be described with reference to the drawings. Common or corresponding elements in the drawings are designated by the same reference numerals to simplify or omit duplicate description.

Embodiment 1.
FIG. 1 is a schematic cross-sectional side view of a hot water storage tank 10 included in the hot water storage type water heater 1 according to the first embodiment. As shown in FIG. 1, the hot water storage type water heater 1 according to the first embodiment includes a hot water storage tank 10. The hot water storage tank 10 is made of a metal such as stainless steel. The hot water storage tank 10 has a cylindrical tank body 2, an upper end plate 3, and a lower end plate 4. The tank central shaft 100 is the central shaft of the hot water storage tank 10. The hot water storage tank 10 is installed in a posture in which the tank central axis 100 is parallel to the vertical line. In the following description, as a general rule, the direction is specified based on the state in which the hot water storage tank 10 is installed in the posture.

The upper end plate 3 is joined to the upper end of the tank body 2. The upper end plate 3 has a bowl-shaped shape that is convex upward. The lower end plate 4 is joined to the lower end of the tank body 2. The lower end plate 4 has a bowl-shaped shape that is convex downward. Each of the joint portion between the upper end plate 3 and the tank body portion 2 and the joint portion between the lower end plate 4 and the tank body portion 2 are formed by, for example, circumferential welding.

In the hot water storage tank 10, hot water is stored by forming a temperature stratification in which the upper side is high temperature and the lower side is low temperature due to the difference in the specific gravity of water depending on the temperature. For example, the hot water storage tank 10 can store low-temperature water supplied from a water source such as an external water supply on the lower layer side, and can store high-temperature water heated by a heating means (not shown) on the upper layer side. The heating means may have any configuration, for example, a heat pump unit that heats water using a refrigeration cycle, or an electric heater arranged in the hot water storage tank 10.

The upper end plate 3 is provided with a hot water supply connection port (not shown) that serves as an inlet / outlet for hot water. At the time of hot water supply, the high-temperature water stored in the hot water storage tank 10 is supplied to a hot water supply destination such as a kitchen or a bath through a hot water supply connection port.

The lower end plate 4 has a bottom wall 4a and a peripheral wall 4b. At least a part of the bottom wall 4a has a curved surface shape. The central portion of the bottom wall 4a is at the lowest position in the vertical direction. The peripheral wall 4b is located higher than the bottom wall 4a. The peripheral wall 4b is an annular portion adjacent to the lower end of the tank body 2.

The tank body 2 forms a peripheral wall at a position higher than the peripheral wall 4b. A through hole 5 is provided in the peripheral wall formed by the tank body 2. The hot water storage type water heater 1 includes a water supply pipe 6 extending from the outside of the hot water storage tank 10 through a through hole 5 to the inside of the hot water storage tank 10, and a baffle structure 7 arranged at the bottom of the hot water storage tank 10. There is. The water supplied from the water source flows into the hot water storage tank 10 through the water supply pipe 6.

In the present embodiment, the through hole 5 is provided in the tank body 2, but instead of the illustrated example, the through hole 5 may be provided in the peripheral wall 4b of the lower end plate 4. That is, the through hole 5 may be provided at a position lower than the illustrated example.

The water supply pipe 6 has a main body portion 6a having an elongated shape and a tip portion 6b provided at the tip end of the main body portion 6a. The tip portion 6b and a part of the main body portion 6a are located inside the baffle structure 7. The main body portion 6a passes through the through hole 5 and extends to the inside of the baffle structure 7. At least a part of the main body portion 6a in the hot water storage tank 10 extends downward or diagonally downward. The baffle structure 7 has a function of regulating the flow direction of water so that the temperature stratification in the hot water storage tank 10 is not disturbed when the water passing through the water supply pipe 6 flows out from the tip portion 6b.

In the present embodiment, since the water supply pipe 6 can be extended to the outside of the hot water storage tank 10 from the position of the through hole 5, the water supply pipe 6 can be pulled out from the bottom wall 4a to the lower side of the hot water storage tank 10. , It is possible to shorten the length of the entire water supply pipe including the water supply pipe 6. Generally, the water supply pipe is provided with an anti-freezing heater to prevent freezing. In the present embodiment, the heat of the hot water stored in the intermediate portion of the hot water storage tank 10 is transmitted to the water supply pipe 6. Therefore, the water supply pipe is less likely to freeze, and the antifreezing heater can be omitted or simplified. Further, in the present embodiment, since the water supply pipe 6 does not extend downward from the bottom wall 4a, it is advantageous in lowering the installation position of the hot water storage tank 10. Therefore, it is advantageous in suppressing the total height of the hot water storage type water heater 1.

The hot water storage type water heater 1 of the present embodiment includes an outer shell case (not shown) that forms an outer shell. The hot water storage tank 10 is arranged inside the outer case while being covered with a heat insulating material (not shown). Various functional parts such as pipes, pumps, valves, heat exchangers, and sensors are further provided inside the outer case, but their configurations are known, so illustration and description thereof will be omitted.

FIG. 2 is a perspective view showing a bottom wall 4a, a water supply pipe 6, and a baffle structure 7 included in the hot water storage type water heater 1 according to the first embodiment. As shown in FIG. 2, a water outlet 6c is formed at the tip portion 6b of the water supply pipe 6. The water that has passed through the main body portion 6a of the water supply pipe 6 flows out from the water outlet 6c of the tip portion 6b to the space inside the baffle structure 7. In the illustrated example, only one water outlet 6c is provided, but a plurality of water outlets 6c may be provided at the tip portion 6b.

In the illustrated example, the tip portion 6b is composed of a tubular member having substantially the same diameter as the main body portion 6a. The water outlet 6c is open to the pipe wall of the tip portion 6b. The tip surface of the tip portion 6b is closed without opening. Not limited to the illustrated example, the tip portion 6b may have a diameter or shape different from that of the main body portion 6a.

The baffle structure 7 has a wall that covers the tip portion 6b from the side and above. The baffle structure 7 in the present embodiment has a side wall 7a and an upper wall 7b, and has a truncated cone shape as a whole. The internal space of the baffle structure 7 is a space surrounded by the bottom wall 4a, the side wall 7a, and the upper wall 7b. The horizontal cross section of the internal space of the baffle structure 7 decreases toward the top.

The side wall 7a covers the tip portion 6b of the water supply pipe 6 from the side. When viewed from the outside of the baffle structure 7 with a horizontal line of sight, the water outlet 6c is covered by the side wall 7a on the entire circumference and is hidden behind the side wall 7a and cannot be seen. In the illustrated example, the side wall 7a has a curved surface shape along a conical surface. The diameter of the side wall 7a decreases toward the top. The shape of the side wall 7a is not limited to the illustrated example, and may be, for example, a cylindrical shape, a prismatic shape, a pyramid trapezoidal shape, or the like.

The upper wall 7b covers the tip portion 6b from above. The upper wall 7b faces the bottom wall 4a. When viewed from above the baffle structure 7 vertically downward, the water outlet 6c is covered with the upper wall 7b and cannot be seen. In the illustrated example, the upper wall 7b has a flat plate shape parallel to the bottom wall 4a. The shape of the upper wall 7b is not limited to the illustrated example, and may have a curved surface shape such as a spherical surface. Further, the side wall 7a and the upper wall 7b may be smoothly continuous due to the curved surface without forming a corner portion between the side wall 7a and the upper wall 7b.

The water outlet 6c is formed so that the water flow from the water outlet 6c flows toward the inner wall surface of the baffle structure 7. In the present embodiment, the water flow flows out from the water outlet 6c in the vertically upward direction, and the water flow flows toward the inner wall surface of the upper wall 7b.

The baffle structure 7 has at least one outlet 7c. In the illustrated example, three outlets 7c are formed. The water that has flowed into the baffle structure 7 from the water supply pipe 6 flows out to the outside of the baffle structure 7 through the outflow port 7c. The baffle structure 7 has a shape without an opening at a position above the outlet 7c. The water flowing out from the water outlet 6c does not flow out to the outside of the baffle structure 7 through a place other than the outlet 7c. As described above, the baffle structure 7 has a shape that blocks the flow of water flowing out from the water outlet 6c.

The outlet 7c is adjacent to the bottom wall 4a. The outflow port 7c opens in a direction parallel to the bottom wall 4a. That is, the direction of the center line of the outlet 7c is substantially parallel to the bottom wall 4a. The water flow flowing out from the outflow port 7c flows along the bottom wall 4a and substantially parallel to the bottom wall 4a.

The water flow flowing out from the water outlet 6c in the vertically upward direction hits the inner wall surface of the upper wall 7b. After that, the water flow is divided into a water flow that is repelled and descends, a water flow that flows parallel to the inner wall surface of the upper wall 7b, a water flow that swirls along the inner peripheral surface of the side wall 7a, and the like. In this way, the flow velocity can be significantly reduced by meandering the water flow flowing out from the water outlet 6c in the internal space of the baffle structure 7. As a result, the flow velocity of the water flow flowing out from the outflow port 7c to the outside of the baffle structure 7 becomes sufficiently low, and it is possible to reliably suppress the generation of the water flow flowing upward from the bottom wall 4a. Therefore, in the present embodiment, when water flows into the hot water storage tank 10 from the water supply pipe 6, it is possible to surely suppress the agitation of the water in the hot water storage tank 10 and the inside of the hot water storage tank 10. It is possible to surely suppress the disturbance of the temperature stratification.

In the present embodiment, since the water flow flows out from the water outlet 6c in the vertically upward direction, the water flow flowing out from the water outlet 6c can be reliably applied to the inner wall surface of the baffle structure 7. Therefore, it is possible to reliably prevent the water flow flowing out from the water outlet 6c from directly flowing out from the water outlet 7c to the outside of the baffle structure 7. Therefore, the flow velocity of the water flow flowing out from the outlet 7c to the outside of the baffle structure 7 can be surely reduced.

As a modification, the direction in which the water flow flows out from the water outlet 6c may be a horizontal direction or a direction diagonally upward with respect to the horizontal plane. Even in that case, the water flow flowing out from the water outlet 6c can be reliably applied to the inner wall surface of the baffle structure 7, and an effect similar to the above effect can be obtained.

The water outlet 6c is located lower than the through hole 5. In the present embodiment, the low-temperature water flowing from the water supply pipe 6 can be quickly guided into the baffle structure 7, so that even if the high-temperature water is stored in the lower part of the hot water storage tank 10, the high-temperature water is stored. It is possible to surely prevent the water supply from being mixed with the water supply.

As a comparative example, considering a structure in which a baffle is provided immediately after the through hole 5 in the hot water storage tank 10, in this structure, the low temperature water supply staying in the baffle and the high temperature water and water supply stored in the hot water storage tank 10 are provided. Heat exchange occurs with and, and the heat of hot water is lost. On the other hand, in the present embodiment, it is possible to surely suppress the occurrence of such heat loss. Further, the present embodiment is advantageous in reducing the size of the baffle structure 7 as compared with the comparative example.

The baffle structure 7 in the present embodiment has an insertion port 8 formed in the side wall 7a. The water supply pipe 6 extends from the outside of the baffle structure 7 to the inside of the baffle structure 7 through the insertion port 8. The water supply pipe 6 is positioned with respect to the baffle structure 7 by being in contact with the inner peripheral portion of the insertion port 8. In the present embodiment, it is not necessary to weld the water supply pipe 6 and the baffle structure 7, and the water supply pipe 6 and the baffle structure 7 are integrated by inserting the water supply pipe 6 into the insertion port 8 in the assembly work. It can be made easy to manufacture. The insertion port 8 may be formed on the upper wall 7b instead of the side wall 7a.

Further, in the present embodiment, a guide member 9 projecting from the insertion port 8 to the outside of the baffle structure 7 is provided. The guide member 9 is provided to improve workability when the water supply pipe 6 is inserted into the insertion port 8 in the assembly work. The guide member 9 has a shape like a trumpet tube whose inner diameter increases from the base end opening to the tip opening. The inner diameter of the base end opening of the guide member 9 is equal to the inner diameter of the insertion port 8. The inner diameter of the guide member 9 increases as the distance from the surface of the baffle structure 7 increases. The tip opening of the guide member 9 has an inner diameter larger than that of the insertion port 8.

FIG. 3 is a perspective view showing a state immediately before the water supply pipe 6 is inserted into the insertion port 8 in the assembly work. As shown in FIG. 3, when the water supply pipe 6 is inserted into the insertion port 8 in the assembly work, the tip portion 6b can be easily inserted into the tip opening of the guide member 9 having a large inner diameter. By further inserting the water supply pipe 6 from that state, the tip portion 6b slides against the inner wall of the guide member 9, and the tip portion 6b can be smoothly and surely inserted into the insertion port 8. Therefore, the assembly work can be performed smoothly, and erroneous assembly can be prevented more reliably.

As shown in FIG. 2, the baffle structure 7 in the present embodiment has a first lower end 7d in contact with the bottom wall 4a and a second lower end 7e not in contact with the bottom wall 4a. The outlet 7c is formed between the bottom wall 4a and the second lower end 7e. With respect to the vertical position, the outlet 7c is below the water outlet 6c. In this case, the center position of the outlet 7c may be below the center position of the water outlet 6c, or the entire outlet 7c may be below the bottom of the water outlet 6c. By doing so, it is possible to more reliably prevent the water flow flowing out from the water outlet 6c from directly flowing out from the outflow port 7c to the outside of the baffle structure 7. As a result, it is possible to more reliably suppress the agitation of the water in the hot water storage tank 10, and it is possible to more reliably suppress the disturbance of the temperature stratification in the hot water storage tank 10. The bottom wall 4a and the first lower end 7d may be joined and fixed by welding, for example.

When there are a plurality of outlets 7c as in the present embodiment, the total opening area of the outlets 7c refers to the total value of the opening areas of the respective outlets 7c. Further, the total opening area of the water outlet 6c means a value obtained by totaling the opening areas of the respective water outlets 6c when there are a plurality of water outlets 6c. In the present embodiment, the total opening area of the outlet 7c is larger than the total opening area of the water outlet 6c. As a result, the flow velocity of the water flow flowing out from the outlet 7c to the outside of the baffle structure 7 can be more reliably reduced. As a result, it is possible to more reliably suppress the agitation of the water in the hot water storage tank 10, and it is possible to more reliably suppress the disturbance of the temperature stratification in the hot water storage tank 10.

The top of the baffle structure 7 is the highest position in the baffle structure 7, and corresponds to the upper wall 7b in the present embodiment. As shown in FIG. 1, in the present embodiment, the top of the baffle structure 7 is below the through hole 5 with respect to the vertical position. As a result, it is possible to more reliably prevent heat exchange between the high-temperature water stored in the hot water storage tank 10 and the water supply that has flowed into the baffle structure 7, so that the heat of the high-temperature water is lost. It can be suppressed more reliably.

As shown in FIG. 1, the baffle central axis 200 is a straight line passing through the center of the baffle structure 7 and parallel to the tank central axis 100. The baffle central shaft 200 is located at a position deviated from the tank central shaft 100 toward the through hole 5. That is, in the present embodiment, the center of the baffle structure 7 is located at a position deviated from the tank center axis 100 toward the through hole 5 with respect to the horizontal position. Further, it is desirable that the entire baffle structure 7 is arranged so as not to intersect the tank central axis 100. These configurations have the following advantages.

As a first advantage, the peripheral welding of the hot water storage tank 10 becomes easy. At the time of peripheral welding of the hot water storage tank 10, a jig for ejecting welding gas (for example, argon gas) is inserted through an opening (not shown) formed in the center of the bottom wall 4a. By arranging the baffle structure 7 avoiding the center of the bottom wall 4a, it is possible to surely prevent the baffle structure 7 from becoming an obstacle when the jig is inserted.

As a second advantage, the length of the water supply pipe 6 in the hot water storage tank 10 can be shortened as compared with the case where the baffle structure 7 is arranged in the center of the bottom wall 4a. As a result, the manufacturing cost of the water supply pipe 6 can be reduced. Further, since the contact area where the hot water and the water supply in the hot water storage tank 10 come into contact with each other through the pipe wall of the water supply pipe 6 is reduced, the heat exchange between the hot water and the water supply in the hot water storage tank 10 can be more reliably suppressed. , The rise in water supply temperature can be surely reduced.

In the present embodiment, the through hole 5 is made of metal. For example, the through hole 5 may be formed by attaching a nipple made of the same metal material as the hot water storage tank 10 to the hot water storage tank 10 by welding. It is desirable that at least the portion of the water supply pipe 6 in contact with the through hole 5 is made of a resin material. By doing so, there are the following advantages. As a first advantage, since heat conduction at the contact point between the through hole 5 and the water supply pipe 6 can be suppressed, it is possible to suppress heat conduction of the heat of the water supply pipe 6 to the metal forming the hot water storage tank 10. , Contributes to the prevention of freezing of the water supply pipe 6. As a second advantage, since it is not necessary to weld the hot water storage tank 10 and the water supply pipe 6, assembly becomes easy. As a third advantage, the manufacturing cost of the water supply pipe 6 can be reduced by making at least a part of the water supply pipe 6 from a resin material.

In the present embodiment, it is desirable that the tip portion 6b of the water supply pipe 6 is made of a member different from the main body portion 6a of the water supply pipe 6. By making the tip portion 6b a separate part, the degree of freedom in designing the tip portion 6b is improved. Further, the tip portion 6b can be used as a common part for the water supply pipe 6 whose types increase depending on the size of the hot water storage tank 10, so that cost reduction and uniform performance can be achieved.

1 Hot water storage type water heater, 2 Tank body, 3 Upper end plate, 4 Lower end plate, 4a Bottom wall, 4b Peripheral wall, 5 Through hole, 6 Water supply pipe, 6a Main body, 6b Tip, 6c Water outlet, 7 Baffle structure , 7a side wall, 7b upper wall, 7c outlet, 7d first lower end, 7e second lower end, 8 insertion port, 9 guide member, 10 hot water storage tank, 100 tank center axis, 200 baffle center axis

Claims (9)

A hot water storage tank having a bottom wall, a peripheral wall at a position higher than the bottom wall, and a through hole provided in the peripheral wall.
A water supply pipe extending from the outside of the hot water storage tank through the through hole to the inside of the hot water storage tank.
The baffle structure arranged at the bottom in the hot water storage tank and
With
The water supply pipe has a tip portion on which at least one water outlet is formed.
The baffle structure has a wall that covers the tip of the water supply pipe from the side and above.
A water stream flows out from at least one water outlet toward the inner wall surface of the baffle structure,
A hot water storage type water heater in which the water flow flows out from at least one water outlet in a vertically upward direction, a horizontal direction, or an obliquely upward direction with respect to a horizontal plane. An insertion slot is formed in the wall of the baffle structure.
The hot water storage type water heater according to claim 1, wherein the water supply pipe extends from the outside of the baffle structure to the inside of the baffle structure through the insertion port. A guide member that projects from the insertion port to the outside of the baffle structure is provided.
The hot water storage type water heater according to claim 2, wherein the inner diameter of the guide member increases as the distance from the surface of the baffle structure increases. The baffle structure has a first lower end in contact with the bottom wall and a second lower end not in contact with the bottom wall.
At least one outlet is formed between the bottom wall and the second lower end.
Water inside the baffle structure flows out of the baffle structure through at least one outlet.
The hot water storage type water heater according to any one of claims 1 to 3, wherein the at least one outlet is located below the at least one water outlet with respect to the position in the vertical direction. The hot water storage type water heater according to claim 4, wherein the total opening area of the at least one outlet is larger than the total opening area of the at least one water outlet. The hot water storage type water heater according to any one of claims 1 to 5, wherein the top of the baffle structure is located below the through hole with respect to the position in the vertical direction. The hot water storage type hot water supply according to any one of claims 1 to 6, wherein the center of the baffle structure is displaced from the central axis of the hot water storage tank toward the through hole with respect to the horizontal position. Machine. The through hole is made of metal and
The hot water storage type water heater according to any one of claims 1 to 7, wherein at least a portion of the water supply pipe in contact with the through hole is made of a resin material. The hot water storage type water heater according to any one of claims 1 to 8, wherein the tip portion of the water supply pipe is formed of a member different from the main body portion of the water supply pipe.

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