JP2016133298A - Hot water storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage tank having excellent strength relative to negative pressure without adding a reinforcement ring.SOLUTION: A hot water storage tank 1 includes: a cylindrical tank body portion 2; a tank upper end plate 3 for closing an opening at one end of the tank body portion 2; and a tank lower end plate 4 for closing an opening at the other end of the tank body portion 2. On the surface of the tank body portion 2, a plurality of recessed portions 5 are provided in a range separated from one end and the other end by a predetermined distance or longer in the cylindrical axial direction and the circumferential direction of the tank body portion 2. The bottom surface of the recessed portion 5 has a regular polygonal shape, and the width of a clearance between the recessed portions 5 formed on the back surface side of the tank body portion 2 is equal to or shorter than the length of one side of the bottom surface of the recessed portion 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot water storage tank.

  Patent Document 1 describes a can of an electric water heater to which a reinforcing ring is added. The can body of the electric water heater described in Patent Document 1 has a plurality of protrusions protruding inward along the circumferential direction on the circumferential surface of the body of the can body. The strength against the negative pressure of the can body is improved by welding the reinforcing ring to a protrusion provided on the circumferential surface of the body of the can body.

Japanese Utility Model Publication No. 6-33304

  In the can of the electric water heater described in the above-mentioned Patent Document 1, an increase in production cost and weight due to the addition of the reinforcing ring becomes a problem. Moreover, the corrosion in the clearance gap which arises in the welding part of a reinforcement ring and the trunk | drum of a can body becomes a subject.

  The present invention has been made to solve the above-described problems. It aims at providing the hot water storage tank which is excellent in the intensity | strength with respect to a negative pressure, without adding a reinforcement ring.

  A hot water storage tank according to the present invention includes a cylindrical tank body, a first tank mirror that closes an opening at one end of the tank body, and a second tank mirror that closes an opening at the other end of the tank body. The surface of the tank body is provided with a plurality of recesses in the cylindrical axis direction and the circumferential direction of the tank body in a range separated by a certain distance from one end and the other end, and the bottom surface of the recess is a regular polygon. The width of the gap formed on the back side of the tank body by the recesses is equal to or less than the length of one side of the bottom surface of the recess.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water storage tank excellent in the intensity | strength with respect to a negative pressure can be provided, without adding a reinforcement ring.

It is a front view of the hot water storage tank of Embodiment 1 of the present invention. It is a figure which shows the tank trunk plate in Embodiment 1 of this invention. It is a perspective view of the tank trunk part in Embodiment 1 of the present invention. It is sectional drawing of the tank trunk plate in Embodiment 1 of this invention. It is an enlarged view of the A section of FIG. 2 in Embodiment 1 of this invention. It is an enlarged view of the B section of Drawing 4 in Embodiment 1 of the present invention. It is a figure which shows the tank trunk plate in Embodiment 3 of this invention. It is a figure which shows the tank trunk plate in Embodiment 4 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, in each figure, the same part or an equivalent part attaches | subjects the same code | symbol, and abbreviate | omits the overlapping description.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a hot water storage tank 1 according to Embodiment 1 of the present invention. The hot water storage tank 1 of the present embodiment includes a tank body 2, a tank upper end panel 3, and a tank lower end panel 4.

  The tank body 2 is cylindrical. Both ends of the tank body 2 are open. The tank upper end plate 3 is fixed to the upper end of the tank body 2 by, for example, welding. The tank upper end plate 3 is an example of a first tank end portion that closes the opening at the upper end of the tank body portion 2. The tank lower end plate 4 is fixed to the lower end of the tank body 2 by, for example, welding. The tank lower end panel 4 is an example of a second tank mirror section that closes the opening at the lower end of the tank body section 2.

  A large number of recesses 5 are provided on the surface of the tank body 2. The recess 5 is provided to increase the rigidity of the tank body 2. By increasing the rigidity of the tank body 2, the hot water storage tank 1 having excellent strength against negative pressure can be obtained. A large number of the recesses 5 are arranged in the cylindrical axial direction and the circumferential direction of the tank body 2.

  FIG. 2 is a view showing a tank body plate 6 that forms the tank body 2. A large number of recesses 5 are provided on the surface of the tank body plate 6. A large number of the recesses 5 are arranged in a grid pattern in a range separated from the upper end 7 and the lower end 8 by a first constant distance r or more and from the left end 9 and the right end 10 by a second constant distance r2 or more. The concave portion 5 is formed on the surface of the tank body plate 6 by drawing, for example.

  In the vicinity of the upper end 7, the lower end 8, the left end 9 and the right end 10 of the tank body plate 6, no recess 5 is provided. For this reason, the upper end 7, the lower end 8, the left end 9, and the right end 10 of the tank body plate 6 are linear without deformation.

  FIG. 3 is a perspective view of the tank body 2. The tank body 2 is formed, for example, by rounding one tank body plate 6 into a cylindrical shape and butt welding the left end 9 and the right end 10 in the longitudinal direction. Since the left end 9 and the right end 10 are linear, variations in heat input during butt welding are reduced. Thereby, in this example, the reliability of welding at the time of forming the tank trunk | drum 2 by butt-welding the tank trunk | drum 6 can be improved.

  A tank upper end plate 3 is welded to the upper end of the tank body 2. The tank body 2 is formed by rounding a tank body plate 6 whose upper end 7 is linear. For this reason, the variation in the heat input amount when the tank upper end plate 3 is welded to the upper end of the tank body 2 is reduced. Thereby, in this example, the reliability of welding can be improved when the tank upper end plate 3 is welded to the upper end of the tank body 2 to form the hot water storage tank 1.

  A tank lower end plate 4 is welded to the lower end of the tank body 2. The tank body 2 is formed by rolling a tank body plate 6 having a straight lower end 8. For this reason, the dispersion | variation in the heat input amount at the time of welding the tank lower end panel 4 to the lower end of the tank trunk | drum 2 is reduced. Thereby, in this example, the reliability of welding can be improved when the tank lower end panel 4 is welded to the lower end of the tank body 2 to form the hot water storage tank 1.

  4 is a cross-sectional view of the tank body plate 6 taken along the line II in FIG. 2 and viewed in the direction of the arrow. The tank body plate 6 is butt welded so that the recess 5 is on the surface side of the tank body 2.

  FIG. 5 is an enlarged view of a portion A in FIG. FIG. 6 is an enlarged view of a portion B in FIG. FIGS. 5 and 6 are views showing the gap 11 formed on the back side of the tank body 2 by the adjacent recesses 5 and the width 11a of the gap 11.

  The shape of the recess 5 when the tank body 2 is viewed from the front side is, for example, a regular hexagon. The bottom surface of the recess 5 has a regular hexagonal shape with a side length 5a. A number of regular hexagonal concave portions 5 are arranged in a honeycomb shape. A gap 11 is formed on the back side of the tank body 2 by the adjacent recesses 5. The width 11 a of the gap 11 is an interval between the concave side portions 5 b of the adjacent concave portions 5.

  The plurality of recesses 5 are densely arranged so that the width 11a of the gap 11 is equal to or less than the length 5a of one side of the bottom surface of the recess 5. The cross-sectional area of the tank body 2 is sufficiently increased by the large number of closely arranged recesses 5. When the cross-sectional area of the tank body 2 is sufficiently increased, the rigidity of the tank body 2 is sufficiently increased. Thereby, if it is this example, the hot water storage tank 1 excellent in the intensity | strength with respect to a negative pressure can be obtained.

  In the hot water storage tank 1 of this example, it is not necessary to weld a member such as a reinforcing ring to the inside of the tank body 2. On the back side of the tank body 2, there are no welds and weld gaps between the tank body 2 and another member. For this reason, the risk of the occurrence of corrosion in the welding gap on the back side of the tank body 2 can be reduced.

  The many recesses 5 are provided, for example, such that the width 11 a of the gap 11 is 2.5 times or more the thickness of the tank body plate 6. Thereby, the risk of the corrosion generation | occurrence | production in the clearance gap 11 in the back surface side of the tank trunk | drum 2 can be reduced.

  The hot water storage tank 1 of the present invention can increase the rigidity of the tank body 2 by providing a large number of regular hexagonal recesses 5 on the surface of the tank body 2 in a lattice shape. The multiple recesses 5 are closely arranged such that the width 11 a of the gap 11 formed on the back side of the tank body 2 by the recesses is equal to or less than the length 5 a of one side of the bottom surface of the recess 5. Thereby, the rigidity of the tank body 2 can be sufficiently increased. By increasing the rigidity of the tank body 2, it is possible to obtain the hot water storage tank 1 that is excellent in strength against negative pressure.

  The present invention can provide a hot water storage tank 1 that is excellent in strength against negative pressure without requiring addition of a reinforcing ring, thickening of the tank body 2, and bead processing on the tank body 2. Thereby, if it is this invention, the weight and production cost of the hot water storage tank 1 can be reduced. In addition, it is possible to reduce the risk of occurrence of corrosion in the weld gap caused by the addition of the reinforcing ring.

  The hot water storage tank 1 of the present invention is formed by welding end plates to one end and the other end of the tank body 2. Since the recess 5 is not provided in the vicinity of one end and the other end of the tank body 2, variation in the amount of heat input when the end plate is welded to the tank body 2 is reduced. Thereby, if it is this invention, the reliability of welding at the time of forming the hot water storage tank 1 by welding a mirror plate to the upper end and lower end of the tank trunk | drum 2 can be improved.

  The number, size, and depth of the recesses 5 formed by drawing are appropriately changed according to the rigidity or strength required for the hot water storage tank 1. As an example, the corner of the recess 5 may be rounded. Thereby, the stress concentration in the corner | angular part of the recessed part 5 can be reduced.

  The shape of the concave portion 5 may be a regular polygonal shape other than a regular hexagon as long as it is a shape that can be arranged in a dense lattice with a narrow width 11a of the gap 11 such as a regular triangle and a square. In addition, the arrangement method of a large number of the recesses 5 may be a layout method other than the honeycomb shape as long as the width 11a of the gap 11 is less than the length 5a of one side of the bottom surface of the recess 5 in accordance with the shape of the recesses 5. May be adopted. For example, as a method for arranging the square-shaped concave portions 5, a square lattice-like arrangement regularly arranged in the vertical and horizontal directions may be employed.

  In this example, the tank body 2 is formed by rolling a single tank body plate 6 into a cylindrical shape and butt welding in the longitudinal direction. In addition to this example, the tank body 2 may be formed by welding ends of a plurality of tank body plates 6 and combining them in a cylindrical shape.

Embodiment 2. FIG.
Next, the hot water storage tank 1 in Embodiment 2 of this invention is demonstrated. The basic configuration of the hot water storage tank 1 of the present embodiment is the same as that of the first embodiment. The shape of the recess 5 is a regular polygon. The bottom surface of the recess 5 has a regular polygonal shape with a side length 5a. In the present embodiment, the case where the length 5a of one side of the bottom surface of the recess 5 is less than 2.5 times the thickness of the tank body plate 6 will be described.

  A large number of the recesses 5 are closely arranged so that the width 11 a of the gap 11 is 2.5 times or less the thickness of the tank body plate 6. The cross-sectional area of the tank body 2 is sufficiently increased by the large number of closely arranged recesses 5. When the cross-sectional area of the tank body 2 is sufficiently increased, the rigidity of the tank body 2 is sufficiently increased. Thereby, the hot water storage tank 1 excellent in the intensity | strength with respect to a negative pressure can be obtained.

  The many recesses 5 are provided, for example, such that the width 11 a of the gap 11 is 2.5 times the thickness of the tank body plate 6. Thereby, the risk of the corrosion generation | occurrence | production in the clearance gap 11 in the back surface side of the tank trunk | drum 2 can be reduced.

Embodiment 3 FIG.
Next, the hot water storage tank 1 in Embodiment 3 of this invention is demonstrated. The basic configuration of the hot water storage tank 1 of the present embodiment is the same as that of the first or second embodiment. The configuration of the hot water storage tank 1 is shown in FIG. A large number of the recesses 5 are provided in the tank body 2 by the arrangement method in the first embodiment or the second embodiment, depending on the shape of the recess 5 and the thickness of the tank body plate 6. FIG. 7 is a diagram showing a tank body plate 6 that forms the tank body 2 in the present embodiment.

  A large number of recesses 5 are provided on the surface of the tank body plate 6. A large number of the recesses 5 are arranged in a grid pattern in a range separated from the upper end 7 and the lower end 8 by a first constant distance r or more and from the left end 9 and the right end 10 by a second constant distance r2 or more.

  The plurality of recesses 5 are provided so as to be symmetric with respect to the cylinder axis of the tank body 2 in a cross section perpendicular to the cylinder axis of the tank body 2 when the tank body plate 6 is rolled into a cylindrical shape. For example, as shown in FIG. 7, in correspondence with the fact that the concave portion 5 is not provided in the region where the distance from the left end 9 is within r2 and the region where the distance from the right end 10 is within r2, The recess 5 is not provided in the region of the width 2r2. As a result, the shape of the cross section perpendicular to the cylindrical axis of the tank body 2 is symmetrical to the cylindrical axis of the tank body 2.

  Since the shape of the cross section perpendicular to the cylinder axis of the tank body 2 is symmetric with respect to the cylinder axis, the tank body 2 has a portion having locally low rigidity with respect to pressure. The rigidity of the tank body 2 is isotropic with little dependence on the direction. Thereby, if it is this Embodiment, the hot water storage tank 1 which the intensity | strength with respect to a pressure is excellent uniformly can be obtained.

Embodiment 4 FIG.
Next, the hot water storage tank 1 in Embodiment 4 of this invention is demonstrated. The basic configuration of the hot water storage tank 1 of the present embodiment is the same as that of the first or second embodiment. Further, as in the third embodiment, when the tank body plate 6 is rolled into a cylindrical shape, a number of sections are symmetric with respect to the cylinder axis of the tank body 2 in a cross section perpendicular to the cylinder axis of the tank body 2. A recess 5 may be provided. FIG. 8 shows a tank body plate 6 forming the tank body 2 in the present embodiment.

  A large number of recesses 5 are provided on the surface of the tank body plate 6. A thermistor 12 is provided on the surface of the tank body plate 6 as an example of hot water temperature detecting means for detecting the hot water temperature in the hot water storage tank 1. The thermistor 12 is provided in the recess 5 as shown in FIG. 8, for example.

  By storing the thermistor 12 in the space of the recess 5, the thermistor 12 does not protrude from the surface of the hot water storage tank 1. For example, when the hot water storage tank 1 is used in a water heater, the hot water storage tank 1 is provided with a heat insulating material that covers the hot water storage tank 1. If it is the hot water storage tank 1 of this example, the site | part used as the obstacle at the time of attaching the heat insulating material which covers the hot water storage tank 1 can be decreased.

  As another example, for example, as shown in FIG. 8, a recess 5 is provided in the vicinity of the center of the tank body plate 6. The hot water storage tank 1 generally tends to buckle due to negative pressure at the center. By concentrating in the part which tends to cause buckling, and providing the recessed part 5, the buckling of the hot water storage tank 1 can be suppressed efficiently.

  As another example, the recess 5 may be arranged so as to avoid the pipe outlet 13. The pipe outlet 13 is provided to take out hot water from the hot water storage tank 1.

  In the hot water storage tank 1 of this example, a plurality of recesses 5 are partially arranged on the surface of the tank shell plate 6 according to the purpose. By arranging the recesses 5 partially, the number of the recesses 5 is reduced. If it is the hot water storage tank 1 of this example, the metal mold | die size used when processing the recessed part 5 in the tank trunk | drum 6 can be reduced. Thereby, the metal mold | die cost for shape | molding the tank trunk plate 6 can be reduced.

  DESCRIPTION OF SYMBOLS 1 Hot water storage tank, 2 Tank body part, 3 Tank upper end panel, 4 Tank lower end panel, 5 Recessed part, 5a One side length, 5b Recessed side part, 6 Tank body plate, 7 Upper end, 8 Lower end, 9 Left end, 10 Right end, 11 clearance, 11a width, 12 thermistor, 13 piping outlet

Claims (7)

A cylindrical tank body;
A first tank mirror for closing an opening at one end of the tank body;
A second tank mirror for closing the opening at the other end of the tank body;
With
On the surface of the tank body, a plurality of recesses are provided in the cylindrical axis direction and the circumferential direction of the tank body in a range separated from the one end and the other end by a certain distance,
The bottom surface of the recess is a regular polygon,
The hot water storage tank in which the width of the gap formed on the back side of the tank body by the recesses is equal to or less than the length of one side of the bottom surface of the recess. The length of one side of the bottom surface of the recess is at least 2.5 times the thickness of the tank body,
The hot water storage tank according to claim 1, wherein a width of a gap formed on the back side of the tank body by the recesses is 2.5 times or more a thickness of the tank body. A cylindrical tank body;
A first tank mirror for closing an opening at one end of the tank body;
A second tank mirror for closing the opening at the other end of the tank body;
With
On the surface of the tank body, a plurality of recesses are provided in the cylindrical axis direction and the circumferential direction of the tank body in a range separated from the one end and the other end by a certain distance,
The bottom surface of the recess is a regular polygon whose one side is less than 2.5 times the thickness of the tank body,
A hot water storage tank in which a width of a gap formed on the back side of the tank body by the recesses is 2.5 times or less of a thickness of the tank body.   4. The hot water storage tank according to claim 3, wherein a width of a gap formed between the recesses on a back side of the tank body is 2.5 times a thickness of the tank body. The bottom surface of the recess is a regular hexagon,
The hot water storage tank according to any one of claims 1 to 4, wherein the recesses are arranged in a honeycomb shape. The tank body is formed by rounding a plate into a cylindrical shape and welding the end of the plate,
The said recessed part is symmetrically provided with respect to the said cylindrical axis in the cross section perpendicular | vertical to the cylindrical axis of the said tank trunk | drum in the range which left | separated the predetermined distance or more from the edge of the said board. The hot water storage tank according to any one of the above.   The hot water storage tank according to any one of claims 1 to 6, further comprising hot water temperature detection means provided in the recess.

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