JP2015078776A - Hot water storage tank unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage tank unit which can be easily repaired, if necessary.SOLUTION: A hot water storage tank unit includes an exterior body 3 accommodating a hot water storage tank 2, a tank leg 5 supporting the hot water storage tank 2 within the exterior body 3, a leg reception part 4 which is fixed to the hot water storage tank 2 and to which the tank leg 5 is fixed, and a product leg 6 supporting the exterior body 3. The hot water storage tank unit is configured such that when a predetermined horizontal load is applied to the hot water storage tank 2 approximately at the center of gravity of the hot water storage tank 2, the product leg 6, the tank leg 5, and the leg reception part 4 are deformed in this order.

Description

  The present invention relates to a hot water storage tank unit including a tank leg that supports a hot water storage tank.

  In the hot water storage tank unit that houses the hot water storage tank in the exterior body, a tank leg that supports the hot water storage tank on the bottom plate of the exterior body, a leg receiving part for fixing the tank leg to the hot water storage tank, and a product leg that supports the exterior body The product legs are fixed to the floor surface via anchor bolts (see Patent Documents 1 and 2).

JP2011-2144A JP 2013-87955 A

  By the way, in the hot water storage tank unit that houses the hot water storage tank in the exterior body, a hot water storage tank of 300 L (liter) or more is generally used, and when the hot water storage tank is full, the weight exceeds 300 kg. It will be received in the order of receiving part, tank leg, product leg. For this reason, when a hot water storage tank shakes greatly by an earthquake etc., it will receive a big load in order of a leg receiving part, a tank leg, and a product leg. At this time, depending on the strength of the leg holder, tank legs, and product legs, the load first concentrates on the most easily deformable part, deforms when it can not withstand that load, and finally the hot water storage tank unit tilts, etc. In some cases, repairs may be necessary.

  However, in the hot water storage tank unit described in Patent Documents 1 and 2, in the case where deformation occurs in the leg receiving part or the tank leg, in order to repair, replacement of the deformed part is performed after removing the exterior body that houses the hot water storage tank. There was a problem that it was necessary to do, and it took time and money.

  In addition, if the leg holder is deformed or damaged, the leg holder is connected to the hot water storage tank by welding, so it is not possible to replace only the leg support. In some cases, the hot water storage tank unit must be replaced, which is very troublesome and expensive.

  This invention solves the said conventional problem, and it aims at providing the hot water storage tank unit which can carry out repair work easily, even when the necessity for repair arises.

  The present invention relates to a hot water storage tank, a box housing the hot water storage tank, a leg receiving part fixed to the hot water storage tank, and a first leg part detachably fixed to the leg receiving part and supporting the hot water storage tank. And a second leg portion that is detachably fixed to the box body and supports the box body, the leg receiving portion, the first leg portion, and the second leg portion being an abbreviation of the hot water storage tank. When a predetermined load is applied to the hot water storage tank in the horizontal direction at the center of gravity, the second leg, the first leg, and the leg support are deformed in this order. To do.

  ADVANTAGE OF THE INVENTION According to this invention, even when the necessity for repair arises, the hot water storage tank unit which can be repaired easily can be provided.

It is a see-through | perspective perspective view which shows the hot water storage tank unit which concerns on 1st Embodiment. It is a perspective view which shows the structure of the upper part of a hot water storage tank. It is a perspective view which shows the support structure of a hot water storage tank unit. It is a perspective view which shows a tank leg. It is a figure explaining the attachment method of a tank leg. It is a perspective view which shows a product leg. It is a figure when the attachment structure of a leg receiving part and a tank leg is seen from the up-down direction. It is a figure which shows the attachment structure of a tank leg and a product leg. It is a side view which shows the positional relationship of a tank leg and the projection part of a lower end plate. It is a perspective view which shows the tank leg of the hot water storage tank unit which concerns on 2nd Embodiment.

  Hereinafter, a hot water storage tank unit 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 10. In addition, in FIG.1, FIG.3, FIG.5, illustration of piping connected to the hot water storage tank 2 is abbreviate | omitted.

(First embodiment)
FIG. 1 is a perspective view showing a hot water storage tank unit according to the present embodiment.
As shown in FIG. 1, a hot water storage tank unit 1 includes a hot water storage tank 2, an exterior body 3 (box body), a leg receiving part 4, a tank leg 5 (first leg part), and a product leg 6 (second leg part). It is configured to include.

  The hot water storage tank 2 is configured in a substantially cylindrical shape using, for example, stainless steel as a material. That is, the hot water storage tank 2 has, for example, a tank capacity of 370 liters, a cylindrical body plate 2a, and a substantially bowl-shaped (hemispherical, vessel-shaped) upper end plate 2b covering the upper opening of the body plate 2a, It is configured by welding three members of a substantially bowl-shaped (hemispherical, bowl-shaped) lower end plate 2c that covers the lower opening of the body plate 2a. Further, the hot water storage tank 2 has a vertically long shape in which the axial direction of the cylindrical body plate 2a is oriented in the vertical direction (gravity direction, vertical direction in the figure), and the center of gravity is positioned at the approximate center in the height direction (vertical direction). ing.

  The exterior body 3 is formed of a steel plate in a substantially square box shape, and has a space for accommodating the hot water storage tank 2 therein. That is, the exterior body 3 includes a front plate 3a located in front of the hot water storage tank 2, a side plate 3b located on the left and right sides (only the right side is shown), a back plate located on the back (not shown), and a ceiling located above The plate 3c and the bottom plate 3d (see FIG. 3) positioned below are configured to surround the front, rear, left, right, top and bottom of the hot water tank 2.

  Although not shown, the hot water storage tank 2 is formed by, for example, covering the outer peripheral surface of the body plate 2a with a vacuum heat insulating material and covering the upper end plate 2b and the lower end plate 2c with a molded heat insulating material (so-called foamed polystyrene). It is configured to obtain high heat insulation.

FIG. 2 is a perspective view showing the configuration of the upper part of the hot water storage tank.
As shown in FIG. 2, the upper end plate 2b of the hot water storage tank 2 is formed with a connection port 2d to which a hot water supply pipe 11 used for general hot water supply or bathtub hot water supply is connected. Hot water (high temperature water) discharged from the hot water supply pipe 11 is mixed with water supplied from a water tap through a mixing valve V to become hot water having a preset temperature, so that a general hot water supply terminal or bathtub (not hot water) is used. Supplied). General hot water is used for general hot water terminals such as faucets and showers in kitchens, washrooms, bathrooms, etc. I mean.

  Further, the upper end plate 2b is formed with a connection port 2e that is an outlet of the reheating heat exchanger 12 that replenishes hot water in a bathtub (not shown). The reheating heat exchanger 12 is configured by winding a pipe along the inner peripheral surface of the hot water storage tank 2, and is disposed in the upper part of the hot water storage tank 2. In addition, the upper end plate 2b is formed with a connection port 2f connected to a pipe 13a through which hot water boiled by the heat pump unit 13 flows. Further, a connection port 2g which is an inlet of the reheating heat exchanger 12 is formed in the body plate 2a.

  The heat pump unit 13 boils water taken out from the hot water storage tank 2 and is connected to a pipe 13 b extending from the hot water storage tank 2. Moreover, the heat pump unit 13 condenses the refrigerant discharged from the compressor, for example, by compressing the refrigerant (for example, carbon dioxide) to high temperature and high pressure, and exchanges heat with water from the hot water storage tank 2. And a pressure reducing valve for depressurizing the refrigerant from the condenser, and an evaporator for absorbing the heat in the atmosphere and evaporating the depressurized refrigerant. In addition, as a heat source for boiling water etc., it is not limited to the heat pump unit 13, The structure which arrange | positions an electric heater etc. in the hot water storage tank 2 may be sufficient.

FIG. 3 is a perspective view showing the support structure of the hot water storage tank unit. FIG. 3 illustrates a state in which the exterior body 3 excluding the bottom plate 3d is removed from the hot water storage tank unit 1 (see FIG. 1).
As shown in FIG. 3, the leg receiving portion 4 is for fixing the tank leg 5 to the hot water storage tank 2, and is fixed to the body plate 2 a of the hot water storage tank 2 by welding.

  Further, the leg receiving portion 4 is formed by bending a sheet metal (for example, a thickness of 0.95 mm) into a substantially L shape, and has a pair of edges whose corner portions are directed radially outward and extend in the vertical direction. The parts 4 a and 4 a are configured to be fixed to the body plate 2 a of the hot water storage tank 2. In this way, by fixing the leg receiving part 4 to the body plate 2a by welding (for example, a welding length of 150 mm), welding can be made easier than when welding to a curved part such as the lower end plate 2c.

  Moreover, the leg receiving part 4 is located in the vicinity of the lower end plate 2c below the body plate 2a. In addition, the heat radiation from the leg receiving part 4 can be minimized by setting the length of the leg receiving part 4 in the vertical direction to the minimum length that can ensure the strength of the leg receiving part 4. The strength of the leg receiving portion 4 is preferably set to a minimum value that is higher than the strength of the tank legs 5 described later.

  Moreover, the leg receiving part 4 is provided in the surrounding surface (side surface) of the hot water storage tank 2 at intervals of 120 degrees. Thereby, when the tank leg 5 to be described later is attached to the leg receiving portion 4, the load received from the hot water storage tank 2 can be made uniform.

  As shown in FIG. 3, the tank leg 5 supports the hot water storage tank 2, and is arrange | positioned along the perpendicular direction (illustrated up-down direction). Further, the tank leg 5 is configured by bending a sheet metal into a substantially L shape, and is located near the radially outer side of the hot water storage tank 2 so as not to contact the hot water storage tank 2. In this way, by disposing the tank leg 5 radially outside the hot water storage tank 2, the hot water storage tank 2 can be supported more stably than when the tank leg is provided on the lower end plate.

  As shown in FIG. 3, the product legs 6 support the exterior body 3 in which the hot water storage tank 2 is accommodated, and are fixed to the lower surface of the bottom plate 3 d of the exterior body 3. Further, the product leg 6 is configured such that the product leg 6 is positioned at a position where the tank leg 5 overlaps with the product leg 6 when viewed in the vertical direction, in other words, vertically below the tank leg 5. Details of the product legs 6 will be described later.

  The bottom plate 3 d constituting the bottom surface of the exterior body 3 is formed in a substantially square plate shape and is located below the lowermost part of the hot water storage tank 2. The lower part of the hot water storage tank 2 (lower end panel 2c) is connected with a water supply pipe (not shown) through which tap water is introduced, piping for introducing the water in the hot water storage tank 2 into the heat pump unit 13 (see FIG. 2), and the like. Has been.

  Further, the bottom plate 3d is formed in a substantially square plate shape having an area slightly larger than the circular section of the hot water storage tank 2. That is, two tank legs 5 and 5 are located at the corners on the back side (rear side) of the bottom plate 3d, and one tank leg 5 is located on the front side. Therefore, the bottom plate 3d is formed to be slightly larger than the hot water storage tank 2, and the hot water storage tank unit 1 is downsized.

FIG. 4 is a perspective view showing a tank leg. FIG. 4 shows a state in which the tank leg 5 is viewed from the back side (hot water storage tank 2 side).
As shown in FIG. 4, the tank leg 5 includes a leg 5a bent in a substantially L shape, a reinforcing plate 5b, and a support plate 5c.

  The leg 5a has, for example, a substantially L-shaped (L-shaped angle) structure in order to obtain strength in the height direction that can withstand the dead weight of the hot water storage tank 2. Further, nuts N1 and N1 are fixed to the leg 5a at the upper part on the inner surface side at intervals in the height direction on the respective surfaces.

  The reinforcing plate 5b is formed in an elongated flat plate shape, and makes it difficult to deform the leg 5a by a load applied in the horizontal direction due to shaking such as an earthquake. The width W1 of the reinforcing plate 5b is formed to be narrower than the interval W2 between the edges 5a1 and 5a1 extending along the vertical direction of the leg 5a. Therefore, the reinforcing plate 5b is positioned in a state of entering the inner side of the edges 5a1 and 5a1 of the leg 5a, and the respective edges 5b1 and 5b1 of the reinforcing plate 5b are connected to the inner surfaces 5a2 and 5a2 of the leg 5a and the welded part. It is fixed via Q.

  The welded portion Q is not welded at all the contact surfaces (contact portions) between the legs 5a and the reinforcing plate 5b, but is formed at a predetermined interval as shown in FIG. Thereby, it can prevent that it becomes expensive compared with the case where all are welded, and also can make the tank leg 5 into a structure which deform | transforms more easily than the leg receiving part 4. FIG. In addition, about the welding length of each welding part Q and the welding position of the welding part Q, it can adjust suitably by the relationship with the structure of the leg receiving part 4 or the structure of the product leg 6. FIG.

  The upper end of the reinforcing plate 5b extends to a position near the lower side of the lower nut N1, and the lower end of the reinforcing plate 5b extends to a position that coincides with the lower end of the leg 5a. The welds Q described above are formed at substantially equal intervals at four locations including the upper end and the lower end of the reinforcing plate 5b. In addition, the location of the welding part Q is not limited to 4 places in a height direction, 3 places or less may be sufficient and 5 places or more may be sufficient.

  The support plate 5c is a substantially rectangular plate-like member, supports the leg 5a, and is fixed to the leg 5a by welding. Further, the support plate 5c is arranged so that the longitudinal direction faces the substantially circumferential direction side of the hot water storage tank 2 (see FIG. 3) (see FIG. 3). Further, nuts N2 and N2 are fixed to the support plate 5c on both sides of the leg 5a.

  Further, a part of the long side (outside) of the support plate 5c has a bent portion 5c1 bent at a right angle in the height direction. As a result, when a large compressive load is applied to the tank legs 5 (particularly, the legs 5a), the legs 5a are not deformed, and the load is concentrated on the connection portion with the support plate 5c that is the tip of the legs 5a. Even so, it becomes difficult for the support plate 5c to be deformed. Therefore, the support plate 5 c has a surface structure in which the load is not concentrated, and can transmit the load of the hot water storage tank 2 to the bottom plate 3 d, that is, the product legs 6.

  The tank leg 5 includes a reinforcing plate portion 5d having a substantially right triangular plate shape, a long side portion 5d1 extending in the vertical direction is fixed to the reinforcing plate 5b by welding, and a short side portion 5d2 extending in the horizontal direction is attached to the support plate 5c. It is fixed by welding. Thereby, it becomes difficult to deform | transform the junction part of the leg 5a and the support plate 5c integrated by welding.

FIG. 5 is a view for explaining a tank leg mounting method.
As shown in FIG. 5, the leg receiving part 4 is formed with a bolt insertion hole 4b through which the bolt B1 is inserted. On the other hand, a bolt insertion hole 5s through which the bolt B1 is inserted is formed in the tank leg 5 at a position corresponding to the nut N1 described above.

  When the tank leg 5 is attached to the leg receiving part 4, the tank leg 5 is inserted into the substantially triangular space between the leg receiving part 4 and the hot water storage tank 2 from below the leg receiving part 4. Then, in a state where each bolt insertion hole 4b of the leg receiving portion 4 and each bolt insertion hole 5s of the tank leg 5 are overlapped, the bolt B1 is inserted from the outside of the leg receiving portion 4 into the bolt insertion holes 4b, 5s, The bolt B1 is screwed into a nut N1 fixed to the tank leg 5. Thereby, the tank leg 5 is fixed to the leg receiving part 4, and the tank leg 5 can be attached to and detached from the leg receiving part 4 by using the bolt B1 and the nut N1.

FIG. 6 is a perspective view showing a product leg.
As shown in FIG. 6, the product leg 6 is configured by combining a base portion 6a, a leg portion 6b, and a fixing portion 6c.

  The base portion 6a is bent into a U-shape and is in contact with the installation ground. Moreover, the base part 6a is comprised by the bottom face part 6a1 and side part 6a2, 6a2 so that a concave surface may become upward. A fixing hole 6a3 through which an anchor bolt (not shown) is inserted is formed in the bottom surface portion 6a1.

  The leg 6b is bent into a U-shape and extends in the height direction (vertical direction). Further, the leg portion 6b is configured such that the concave surface is directed forward by the bottom surface portion 6b1 and the side surface portions 6b2 and 6b2. Further, the lower end of the side surface portion 6b2 is fixed to the upper end of the side surface portion 6a2 by welding. The bottom surface portion 6b1 is longer than the side surface portion 6a2 and is fixed to the inner surfaces of the bottom surface portion 6a1 and the side surface portions 6a2 and 6a2 by welding.

  The fixed portion 6c is a portion that is bent into a U-shape and is in contact with the bottom plate 3d. The fixing portion 6c is configured such that the concave surface is directed downward by the bottom surface portion 6c1 and the side surface portions 6c2 and 6c2. Moreover, the fixing | fixed part 6c is arrange | positioned in the direction orthogonal to the base part 6a, and is fixed to the leg part 6b by welding in the state which covered the upper part of the leg part 6b. Moreover, the fixing | fixed part 6c is formed longer than the width | variety of the leg part 6b, and protrudes outside the side parts 6b2 and 6b2. Bolt insertion holes 6c3 and 6c3 into which the bolt B2 (see FIG. 7) is inserted are formed in the bottom surface portion 6c1 of the protruding portion.

  In the product leg 6, when a predetermined load is applied in the horizontal direction at the center of gravity of the hot water storage tank 2 (hot water storage tank unit 1), the leg 6 b receives a compressive load in the height direction of the hot water storage tank 2. For this reason, in order to prevent that the product leg 6 deform | transforms easily, it is set as the U shape. However, the tank leg 5 is configured to be more easily deformed than the tank leg 5. For example, this can be achieved by making the plate thickness of the leg 6b of the product leg 6 thinner than the plate pressure of the leg 5a of the tank leg 5 and the reinforcing plate 5b. Or it can respond by making the cross-sectional secondary moment of the tank leg 5 smaller than the cross-sectional secondary moment of the product leg 6. Note that the cross-sectional secondary moment is an amount representing the difficulty of deformation of the object with respect to the bending moment.

  In the hot water storage tank unit 1 having the leg receiving part 4, the tank leg 5 and the product leg 6 configured as described above, the strength of the tank leg 5 is higher than the strength of the product leg 6, and the strength of the leg receiving part 4 is higher. The structure is higher than the strength of the tank legs 5. The strength here refers to the degree of deformation that can be reused without replacing the part when a predetermined load is applied in the horizontal direction at the center of gravity of the hot water tank 2 (hot water tank unit 1). Yes. That is, the hot water storage tank unit 1 is configured to be easily deformed in the order of the product legs 6, the tank legs 5, and the leg receiving portions 4. The predetermined load is, for example, a load (1G) corresponding to a mass when the hot water storage tank 2 is full when it is assumed that an earthquake has occurred.

  By adopting such a strength structure, even when the hot water storage tank unit 1 is shaken due to an earthquake or the like and the hot water storage tank unit 1 is deformed, the product leg 6 having the weakest strength is first deformed, so that repair can be performed. Even if necessary deformation occurs in the product legs 6, since the product legs 6 are outside the exterior body 3, the product legs 6 can be replaced without removing the exterior body 3 of the hot water tank unit 1. It becomes possible.

  In addition, in the leg receiving part 4, the shape of the metal plate, the welding length, the number of bolt insertion holes 4b, and the position in the height direction, when a predetermined load is applied in the horizontal direction at the center of gravity of the hot water storage tank 2, The structure is such that the leg receiving part 4 is not deformed, the welding with the hot water storage tank 2 is not peeled off, the load is concentrated on the bolt insertion hole 4b for fixing the tank leg 5 and the plate of the leg receiving part 4 is not broken. It is preferable. In addition, in order to satisfy these, it is also possible to select the shape of the leg receiving portion 4 as a U-shaped or H-shaped steel plate, increase the number of bolt insertion holes 4b, or increase the welding length. it can.

FIG. 7 is a view of the mounting structure of the leg receiving portion and the tank leg when viewed from the up and down direction.
As shown in FIG. 7, the tank leg 5 is inserted so as to be in contact with the inner surface of the leg receiving portion 4. Then, the bolt B1 is inserted from the leg receiving portion 4 side in the order of the bolt insertion hole 4b and the bolt insertion hole 5s and screwed into the nut N1 fixed to the tank leg 5.

  Thus, by fixing the pair of bolts B1 to the leg receiving part 4 with respect to the respective surfaces of the tank leg 5, the tank leg 5 can be fixed to the leg receiving part 4 without rattling. Further, by fixing the tank leg 5 to the leg receiving portion 4 using the bolt B1, when the tank leg 5 has a problem and needs to be replaced, only the tank leg 5 is replaced. be able to.

FIG. 8 is a view showing an assembly structure of the tank legs and the product legs.
As shown in FIG. 8, in the state where the bottom plate 3d of the exterior body 3 is sandwiched between the tank leg 5 and the product leg 6, the nut N2 of the tank leg 5 and the bolt insertion hole 6c3 of the product leg 6 are in the vertical direction. Are arranged so as to overlap each other. Then, the bolt B2 is inserted from the product leg 6 side and screwed into the nut N2 of the tank leg 5. Thus, by fixing using the bolt B2 and the nut N2, the tank leg 5 and the product leg 6 can be attached to and detached from each other, and the tank leg 5 and the product leg 6 can be attached to and detached from the bottom plate 3d. ing.

  Thus, the strength of the member that supports the hot water storage tank 2 can be improved by connecting and fixing the tank legs 5 and the product legs 6 having relatively high strength. Further, by fixing the tank leg 5 and the product leg 6 via the bolt B2, when the product leg 6 has a problem and it becomes necessary to replace the product leg 6, only the product leg 6 is exchanged. be able to.

  As described above, in the hot water storage tank unit 1 according to the first embodiment, when a predetermined load is applied to the hot water storage tank 2 in a horizontal direction at a substantially center of gravity position of the hot water storage tank 2, the product legs 6 and the tank It is comprised so that it may deform | transform in order of the leg 5 and the leg receiving part 4. FIG. According to this, even when the hot water storage tank unit 1 is shaken due to an earthquake or the like and the hot water storage tank unit 1 is deformed, the product leg 6 that is most likely to be deformed is deformed first, so the product leg 6 needs to be repaired. Even if such deformation occurs, the product legs 6 are provided outside the exterior body 3, so that the product legs 6 can be exchanged without removing the exterior body 3.

  Even if the tank legs 5 are deformed to the extent that they need to be repaired, it is only necessary to remove the tank legs 5 from the leg receiving portions 4, so that it is not necessary to replace the hot water storage tank 2 (hot water storage tank unit 1). Further, by adopting a configuration in which the leg receiving portion 4 is less likely to be deformed than the tank legs 5 and the product legs 6, it is possible to prevent the necessity of replacing the hot water storage tank 2 (hot water storage tank unit 1) as much as possible.

  In the first embodiment, the tank legs 5 are connected and fixed to the product legs 6 with the bottom plate 3d of the exterior body 3 interposed therebetween. According to this, since the load transmitted from the hot water storage tank 2 to the tank legs 5 can be directly transmitted to the product legs 6, the load on the tank legs 5 can be absorbed by the product legs 6, and the tank legs 5 are deformed. Can be suppressed.

  Moreover, in 1st Embodiment, the leg receiving part 4 is being fixed to the lower part of the trunk | drum 2a, and the vicinity of the lower end plate 2c by welding. According to this, since the trunk | drum 2a is linearly extended in the height direction (vertical direction), the welding of the leg receiving part 4 can be made easy. Moreover, since the length of the tank leg 5 in the vertical direction can be shortened, the tank leg 5 can be prevented from being deformed more easily than the product leg 6.

(Second Embodiment)
By the way, in the hot water storage tank 2 having a tank capacity of 1.5 times larger than 370 L (liter), a 1 G load (predetermined load) is applied in the horizontal direction at the center of gravity of the hot water storage tank 2 (hot water storage tank unit 1). The load is 1.5 times that of 370L. For this reason, the load applied to each of the leg receiving portion 4, the tank leg 5, and the product leg 6 is different from that in the first embodiment.

  FIG. 9 is a side view showing the positional relationship between the tank legs and the protrusions of the lower end plate, and FIG. 10 is a perspective view showing the tank legs of the hot water storage tank unit according to the second embodiment. Note that the second embodiment is the same as the first embodiment except for the position of the welded portion Q between the leg 5a and the reinforcing plate 5b.

  As shown in FIG. 9, the hot water storage tank 2 is composed of three parts, a body plate 2a, an upper end plate 2b, and a lower end plate 2c. Here, at the end portion on the opening side of the lower end plate 2c, in order to facilitate positioning of the plates when welding to the body plate 2a, the outer end surface on the opening side of the lower end plate 2c is radially arranged. A protruding portion 2c1 protruding outward is provided. The protrusion 2c1 is provided on the entire circumference along the circumferential direction. As a result, the protrusion 2c1 protrudes radially outward from the outer peripheral surface of the body plate 2a, so that the protrusion 2c1 is the portion closest to the tank leg 5.

  For example, in the hot water storage tank 2 with a tank capacity of 560 L, when the load in the middle of applying a 1 G load in the horizontal direction at the center of gravity of the hot water storage tank 2 exceeds 1 G with a tank capacity of 370 L, the protrusion of the lower end plate 2 c When the load 2c1 moves in the direction of arrow S in the figure and contacts the tank leg 5 and the load is further increased, the protrusion 2c1 is intensively pressed against the tank leg 5, and this pressing continues, This will promote deformation.

  Therefore, as shown in FIG. 10, the tank leg 5A is configured such that the position of the welded portion Q1 between the leg 5a and the reinforcing plate 5b is arranged at a position where the protruding portion 2c1 comes into contact. That is, even if the leg 5a of the tank leg 5 and the reinforcing plate 5b are integrated by welding at a predetermined interval as shown in FIG. 4, there is no weld at the portion where the projection 2c1 of the lower end plate 2c contacts. Since the load of the hot water storage tank 2 is received only by the leg 5a, it is not possible to obtain the integration effect by welding the leg 5a and the reinforcing plate 5b. Therefore, as shown in FIG. 10, by forming the welded portion Q1 at a position corresponding to the protruding portion 2c1, even if the protruding portion 2c1 is intensively pressed against the tank leg 5A, the tank leg 5A is hardly deformed. Thus, the deformation of the product leg 6 starts before the tank leg 5A.

  In 2nd Embodiment, the welding part Q1 is formed in the height position corresponding to the projection part 2c1 which protrudes to a radial direction outer side from the lower end plate 2c. According to this, deformation of the tank leg 5A due to the protrusion 2c1 of the lower end plate 2c can be suppressed.

  Moreover, in 2nd Embodiment, the welding part Q1 is extended and formed in the up-down direction centering | focusing on the height position corresponding to the projection part 2c1. According to this, even if the positional relationship between the welded part Q1 and the protruding part 2c1 is somewhat shifted, the welded part Q1 can be made to correspond to the height position of the protruding part 2c1.

  The present invention is not limited to the above-described embodiment, and the configuration can be changed as appropriate without departing from the spirit of the present invention. For example, in the above-described embodiment, the combination of the L-shaped angle leg body 5a and the flat plate-shaped reinforcing plate 5b has been described as an example. However, the structure of this part is easier to deform than the leg support portion 4, And in order to make it the structure which is harder to deform | transform than the product leg 6, the shape of the leg 5a uses a sheet metal like a U-shape or a H-shaped steel shape, and the flat reinforcement board 5b is used. The structure which is not used may be sufficient.

  In the present embodiment, the hot water storage tank unit 1 including the three tank legs 5 has been described as an example. However, the number of the tank legs 5 is not limited to three, and may be four or more. There may be. For example, in the case of four tank legs 5, it is preferable to arrange two on the front side and the back side of the hot water storage tank 2 at 90 ° intervals so that the load of the hot water storage tank 2 is equal.

  In the present embodiment, the tank leg 5 and the product leg 6 are overlapped in the vertical direction, and the tank leg 5 and the product leg 6 are connected and fixed with the bottom plate 3d interposed therebetween. The product leg 6 may be configured not to overlap in the vertical direction.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank unit 2 Hot water storage tank 2a Body plate 2b Upper end plate 2c Lower end plate 2c1 Projection part 3 Exterior body (box)
3d Bottom plate 4 Leg receiving part 5,5A Tank leg (first leg part)
5a Leg 5b Reinforcement plate 6 Product leg (second leg)
Q, Q1 welded part

Claims (5)

A hot water storage tank,
A box housing the hot water storage tank;
A leg holder fixed to the hot water storage tank;
A first leg that is detachably fixed to the leg support and supports the hot water storage tank;
A second leg that is removably fixed to the box and supports the box,
When the predetermined load is applied to the hot water storage tank in the horizontal direction at the approximate center of gravity of the hot water storage tank, the second leg part, the first leg part, and the second leg part, A hot water storage tank unit configured to be deformed in the order of the first leg portion and the leg receiving portion.   The hot water storage tank unit according to claim 1, wherein the first leg portion is connected and fixed to the second leg portion with a bottom plate of the box interposed therebetween. The hot water storage tank includes a cylindrical body plate, an upper end plate covering an upper part of the body plate, and a lower end plate covering a lower part of the body plate,
The hot water storage tank unit according to claim 1 or 2, wherein the leg receiving portion is fixed to the lower portion of the body plate and in the vicinity of the lower end plate by welding. The first leg is
A leg extending vertically downward from the leg support,
A reinforcing plate disposed between the leg and the hot water storage tank and fixed via the leg and a welded portion;
The hot water storage tank unit according to claim 3, wherein the welded portion includes a height position corresponding to a protruding portion protruding radially outward from the lower end plate.   The hot water storage tank unit according to claim 4, wherein the welded portion is continuously formed in the vertical direction including a height position corresponding to the protruding portion.

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