JP5152270B2 - Casing units such as hot water storage tanks - Google Patents

Description

  The present invention relates to a casing unit such as a hot water storage tank unit having a hot water storage tank for storing hot water as a heavy object.

  The hot water storage tank unit includes a hot water storage tank that stores hot water and a substantially rectangular parallelepiped casing that covers the hot water storage tank. More specifically, the hot water storage tank is covered with a heat insulating material in order to keep warm water in the casing. Moreover, the hot water storage tank is being fixed to the bottom face of the said casing via the leg part of the said hot water storage tank. The casing itself is supported by legs of the casing and is installed at a predetermined installation location.

  In the hot water storage tank unit configured as described above, the hot water storage tank that is a heavy object is the heaviest, and when a shock is applied during transportation or installation, an acceleration that causes the hot water storage tank and the casing to move separately occurs. In general, a casing formed of a thin plate is weak in strength, and may deform when an impact is applied to the hot water storage tank unit.

  Conventionally, for example, Patent Document 1 discloses a configuration in which a reinforcing stay having a U-shaped cross section extending in the left-right direction of a hot water storage tank unit is provided inside a side surface of a casing. For example, Patent Document 2 discloses a configuration including an arm for fastening a hot water storage tank and a top surface of a casing. Furthermore, for example, Patent Document 3 discloses a configuration provided with reinforcing ribs by making the casing (outer wall) covering the side surface of the hot water storage tank into a triangular shape.

Japanese Utility Model Publication No.59-161452. JP 2004-144447 A JP 2006-226592 A

  However, in the method of simply reinforcing the casing as in the configuration described in Patent Document 1 or 3, the weight of the casing increases, and a fixing tool such as a screw that fixes the side surface of the casing and the bottom surface of the casing is attached. Impact may increase. Further, as in the configuration described in Patent Document 2, in the method of strengthening the coupling between the casing and the hot water storage tank, there is a high possibility that an impact is directly applied to a fixed portion of the hot water storage tank with the casing and the hot water storage tank is damaged. Become. As a result, if it plays the role of a casing for protecting the hot water storage tank, it would end in the end.

  The present invention has been made to solve the above-described problems, and enables both protection of built-in heavy objects and prevention of damage or deformation of the casing itself when an impact load is applied to the casing unit. An object of the present invention is to obtain a casing unit having a structure.

A casing unit according to the present invention includes a casing having a top surface, a front surface, a back surface, a left side surface, a right side surface, and a bottom surface each formed in a plate shape, and a casing unit in which a heavy object is accommodated in the casing, The heavy object is fixed to the bottom surface, and the cushioning material installed between the heavy object and the top surface and at least two of the top surface, the front surface, the back surface, the left side surface, and the right side surface are interposed. A reinforcing member provided inside the casing so as to bridge without passing through the heavy object .

  According to this invention, when an impact load is applied to the casing unit, it is possible to obtain a casing unit having a structure capable of both protecting a built-in heavy object and preventing damage or deformation of the casing itself.

It is a perspective view which shows the hot water storage tank unit in Embodiment 1 of this invention. It is front sectional drawing which shows typically the structure of the hot water storage tank unit shown in FIG. It is the top view (A) and side view (B) of the hot water storage tank unit shown in FIG. It is a figure which cut | disconnects the hot water storage tank unit shown in FIG. 1 by the AA line in FIG. 3 (B) typically. It is a figure which shows typically the structure of the characteristic part in the hot water storage tank unit of Embodiment 2 of this invention. It is a figure which shows typically the structure of the characteristic part in the hot water storage tank unit of Embodiment 3 of this invention. It is a figure which shows typically the structure of the characteristic part in the hot water storage tank unit of Embodiment 4 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a hot water storage tank unit 1 according to Embodiment 1 of the present invention. A hot water storage tank unit 1 shown in FIG. 1 is a casing unit that contains a hot water storage tank 2 for storing hot water as a heavy object, and includes a casing 3 for housing the hot water storage tank 2. More specifically, the casing 3 has a top surface 3a, a front surface 3b, a back surface 3c, a left side surface 3d, a right side surface 3e, and a bottom surface 3f, each formed in a plate shape.

  As shown in FIG. 1, a pipe connection portion 4 is provided on the front surface 3 b of the casing 3. In order to improve the workability of the pipe connection in the pipe connection part 4, a notch part 5 is provided at the lower part of each side surface 3 d, 3 e of the casing 3.

  FIG. 2 is a front cross-sectional view schematically showing the configuration of the hot water storage tank unit 1 shown in FIG. As shown in FIG. 2, the outer periphery of the hot water storage tank 2 is covered with a tank heat insulating material 2a. Further, the hot water storage tank 2 is fixed to the bottom surface 3f of the casing 3 through the leg portions 2b. A cushioning material 6 is installed between the hot water storage tank 2 and the top surface 3 a of the casing 3. A leg 7 for supporting the casing 3 is fixed to the bottom surface 3 f of the casing 3.

  In FIG. 2, only a part of the casing fixing screws 8 is illustrated, but the top surface 3 a and the side surfaces 3 d and 3 e of the casing 3 are formed by using a plurality of casing fixing screws 8 at the portion where both are joined. Each is fixed. Similarly, the side surfaces 3 d and 3 e and the bottom surface 3 f of the casing 3 are also fixed using a plurality of casing fixing screws 8. Although not shown here, the front surface 3b and the top surface 3a of the casing 3, the front surface 3b and the bottom surface 3f, the back surface 3c and the top surface 3a, the back surface 3c and the bottom surface 3f, the front surface 3b and the side surfaces 3d and 3e, Similarly, the back surface 3c and the side surfaces 3d and 3e are fixed by using a plurality of casing fixing screws 8.

  3 is a plan view (A) and a side view (B) of the hot water storage tank unit 1 shown in FIG. FIG. 4 is a diagram schematically showing the hot water storage tank unit 1 cut along line AA in FIG. 3 (B). In the case of having the notch 5 as described above, when an impact load is applied to the hot water storage tank unit 1 by dropping, there is a problem that stress concentrates on the notch 5 and the casing 3 is easily deformed. . Therefore, in this embodiment, as shown in FIGS. 3 and 4, a reinforcing plate (reinforcing member) 9 having the following characteristics is provided inside the casing 3.

  As shown in FIG. 4, the reinforcing plate 9 of the present embodiment is provided inside the casing 3 so as to bridge the back surface 3 c, the left side surface 3 d, and the front surface 3 b of the casing 3 via three fixing portions 10. A plate-like first reinforcing plate 9a, and a plate-like second reinforcing plate 9b provided inside the casing 3 so as to bridge the back surface 3c, the right side surface 3e and the front surface 3b using the three fixing portions 10; It has. More specifically, these reinforcing plates 9a and 9b are each formed to be curved in a substantially U shape. Further, the first reinforcing plate 9a is fixed to the back surface 3c in the vicinity of one end of the first reinforcing plate 9a, fixed to the left side surface 3d in the central portion, and the front surface 3b in the vicinity of the other end. And are fixed. Similarly, the second reinforcing plate 9b is fixed to the back surface 3c in the vicinity of one end of the second reinforcing plate 9b, fixed to the left side surface 3d in the central portion, and the front surface in the vicinity of the other end. It is fixed to 3b. With such a configuration, the reinforcing plate 9 is fixed inside the casing 3 in such a manner that the reinforcing plate 9 can be bent when an impact load is applied to the casing 3. In addition, the fixing method of the reinforcing plate 9 and the casing 3 by the fixing portion 10 is not particularly limited, and for example, screwing, riveting, screwing, fitting such as insertion, welding, or the like can be used. . However, for the maintenance of the hot water storage tank unit 1, it is desirable that the front surface 3b or the side surfaces 3d and 3e of the casing 3 be configured to be easily removable.

  Further, as shown in FIG. 3B, the reinforcing plate 9 (both the first reinforcing plate 9a and the second reinforcing plate 9b) is arranged such that the height of the casing 3 increases from the back surface 3c side of the casing 3 toward the front surface 3b side. It is installed to be higher in the direction. With such a configuration, the fixing portion 10 between the reinforcing plate 9 and the front surface 3b and the fixing portion 10 between the reinforcing plate 9 and the side surface (the left side surface 3d or the right side surface 3e) are provided above the notch portion 5. ing.

  When the hot water storage tank unit 1 configured as described above falls down vertically while leaning forward, acceleration is applied to the hot water storage tank 2 and the casing 3 downward. Thereafter, when the leg portion 7 is grounded, the bottom surface 3f, the leg portion 2b, and the hot water storage tank 2 of the casing 3 are stationary because they are firmly connected to each other, but the top surface 3a of the casing 3 and four side surfaces (front surface 3b). The back surface 3c, the left side surface 3d and the right side surface 3e) try to fall downward. Here, when the hot water storage tank unit 1 falls in the vertical downward direction in a leaning state as described above, the force applied to the top surface 3a and the four side surfaces of the casing 3 is the vertical vector of the casing 3, the casing It can be separated into 3 vectors in the front-rear direction.

  If the reinforcing plate 9 is not provided, stress is applied to the contact portion between the casing fixing screw 8 and a screw hole (not shown), and particularly stress is concentrated in the vicinity of the screw hole around the notch 5. . On the other hand, according to the configuration of the present embodiment, the stress in the vertical direction of the casing 3 is alleviated by the compression deformation of the cushioning material 6. On the other hand, the stress in the front-rear direction of the casing 3 is alleviated by bending of the four sides of the casing 3 and the top surface 3 a and the reinforcing plate 9. That is, the reinforcing plate 9 has an effect of dispersing stress acting on the casing 3 and preventing the stress from being concentrated in the vicinity of some screw holes. As a result, it is possible to reduce the possibility of buckling deformation due to stress concentration on the lower portions of the side surfaces 3d and 3e of the casing 3 having the notch portion 5. Further, it is possible to prevent the impact applied to the casing 3 from being transmitted to the hot water storage tank 2 and being damaged.

  As described above, according to the configuration of the present embodiment, when an impact load due to dropping is applied to the hot water storage tank unit 1, protection of the internal hot water storage tank 2 and damage or buckling deformation of the casing 3 itself. A structure capable of both prevention can be obtained. As a result, useless use of resources associated with replacement of the casing 3 due to poor appearance or replacement due to a malfunction of the hot water storage tank 2 can be suppressed. In general, in order to improve the impact resistance, it is necessary to form the casing 3 with a thick material or to use a large amount of packing material for transportation. Cost can be reduced.

  Further, by providing the reinforcing plate 9 configured as described above, it is possible to obtain an effect of suppressing deformation of the casing 3 when the hot water storage tank unit 1 is laid and transported. Further, in the present embodiment, the fixing portion 10 between the reinforcing plate 9 and the front surface 3b and the fixing portion 10 between the reinforcing plate 9 and the side surface (the left side surface 3d or the right side surface 3e) are provided above the notch portion 5. It has been. Thereby, when the hot water storage tank unit 1 falls in the vertical downward direction in a bent state, the stress from substantially above the notch portion 5 of the casing 3 can be effectively relieved.

  By the way, in Embodiment 1 mentioned above, the plate-shaped reinforcement board 9 is provided as a reinforcement member. However, the reinforcing member in the present invention is not limited to a plate-like member, and may be, for example, a rod-like member.

  Moreover, in Embodiment 1 mentioned above, the reinforcement board 9 is installed so that it may come to a higher position in the height direction of the casing 3 as it goes to the front surface 3b side from the back surface 3c side of the casing 3. FIG. However, instead of such a configuration, the reinforcing member in the present invention may be installed so as to remain horizontal between the back surface and the front surface of the casing, or from the back surface side of the casing to the front surface side. You may be installed so that it may come to a lower position in the height direction of a casing as it goes.

  Moreover, in Embodiment 1 mentioned above, as the countermeasure against the case where the hot water storage tank unit 1 falls in the vertically downward direction in the bent state, the back surface 3c, the left side surface 3d, and the front surface 3b of the casing 3 are bridged. The reinforcing plate 9 includes a first reinforcing plate 9a provided, and a second reinforcing plate 9b provided so as to bridge the back surface 3c, the right side surface 3e, and the front surface 3b. According to such a configuration, as described above, the stress in the front-rear direction of the casing 3 can be alleviated by bending the four sides of the casing 3, the top surface 3a, and the reinforcing plate 9. This is also effective as a countermeasure assuming that the hot water storage tank unit 1 falls in the vertical downward direction with the back bent. However, the present invention is not limited to the above-described configuration. For example, the left side surface 3d of the casing 3 can be used as a countermeasure assuming a case where the hot water storage tank unit falls vertically downward in a laterally bent state. A reinforcing member provided with a first reinforcing member provided so as to bridge the back surface 3c and the right side surface 3e, and a second reinforcing member provided so as to bridge the left side surface 3d, the front surface 3b and the right side surface 3e. May be provided.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a diagram schematically showing a configuration of a characteristic portion in hot water storage tank unit 11 according to Embodiment 2 of the present invention. The hot water storage tank unit 11 is configured in the same manner as the hot water storage tank unit 1 shown in FIGS. 1 to 4 except for the difference in the configuration of FIG. 5 from the configuration of FIG.

  As shown in FIG. 5, the reinforcing plate 12 of the present embodiment is formed to be curved in a substantially U shape, and bridges the left side surface 3 d, the front surface 3 b, and the right side surface 3 e using three fixing portions 13. Thus, it is provided inside the casing 3. More specifically, both ends of the reinforcing plate 12 are fixed by using a casing fixing screw 8 that fixes the left side surface 3d or the right side surface 3e and the back surface 3c. In addition, the reinforcing plate 12 is fixed to the left side surface 3d at a portion near the center of the left side surface 3d using the three fixing portions 13, and is fixed to the front surface 3b at a substantially U-shaped apex, and the right side surface 3e It is fixed to the right side surface 3e at a portion near the center. With such a configuration, the reinforcing plate 12 is fixed inside the casing 3 in such a manner that the reinforcing plate 12 can be bent when an impact load is applied to the casing 3. In addition, the method similar to what was mentioned above about the fixing | fixed part 10 can be used for the fixing method of the reinforcement board 12 and the casing 3 by the fixing | fixed part 13. FIG.

  Even with the configuration of the second embodiment described above, when the hot water storage tank unit 11 falls in the vertical downward direction with the forward bending state, the stress in the vertical direction of the casing 3 is reduced by the buffer material 6 being compressed and deformed. In addition, the stress in the front-rear direction of the casing 3 can be mitigated by the bending of the four sides of the casing 3 and the top surface 3a and the reinforcing plate 12.

  Moreover, according to the structure of this embodiment, when the reinforcement board 12 bends, a stress generate | occur | produces in the direction which spreads the side surfaces 3d and 3e and the front surface 3b. For this reason, the possibility that the casing 3 is bent inward and the hot water storage tank 2 and other parts inside the casing 3 are pressed and damaged can be reduced. Furthermore, according to the configuration of the present embodiment, the reinforcing plate 12 can be formed by a single plate (or a single rod when the reinforcing plate is formed in a rod shape). Compared with the one reinforcing plate 9, the number of parts can be reduced.

  By the way, in Embodiment 2 mentioned above, it is provided so that the left side surface 3d, the front surface 3b, and the right side surface 3e may be bridged as a countermeasure assuming a case where the hot water storage tank unit 11 falls vertically downward in a leaning state. A reinforcing plate 12 is provided. However, the present invention is not limited to the above configuration, and may be as follows. That is, for example, as a countermeasure assuming that the hot water storage tank unit falls vertically downward in a bent state, the reinforcing member provided to bridge the left side surface 3d, the back surface 3c, and the right side surface 3e of the casing 3 Is preferably provided. In addition, for example, as a countermeasure assuming that the hot water storage tank unit falls vertically downward in a left side bending state, a reinforcing member provided so as to bridge the back surface 3c, the left side surface 3d, and the front surface 3b of the casing 3 Is preferably provided. In addition, for example, as a countermeasure assuming that the hot water storage tank unit falls vertically downward in a right side bending state, a reinforcing member provided to bridge the back surface 3c, the right side surface 3e, and the front surface 3b of the casing 3 Is preferably provided.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a diagram schematically showing a configuration of a characteristic portion in hot water storage tank unit 21 according to Embodiment 3 of the present invention. The hot water storage tank unit 21 is configured in the same manner as the hot water storage tank unit 1 shown in FIGS. 1 to 4 except for the difference in the configuration of FIG. 6 from the configuration of FIG.

  As shown in FIG. 6, the reinforcing plate 22 of the present embodiment is formed to be curved in a substantially U shape, and the left side surface 3 d and the right side surface 3 e are connected to these side surfaces by using two fixing portions 23. It is provided inside the casing 3 so as to bridge without passing through other surfaces of the casing 3 other than 3d and 3e. More specifically, the reinforcing plate 22 is installed so as to bridge the left side surface 3d and the right side surface 3e through a space between the hot water storage tank 2 and the front surface 3b of the casing 3. Further, the reinforcing plate 22 is fixed to the left side surface 3d and the right side surface 3e, respectively, using the fixing portions 23 in the vicinity of both ends thereof. With such a configuration, the reinforcing plate 22 is fixed inside the casing 3 in such a manner that the reinforcing plate 22 can be bent when an impact load is applied to the casing 3. In addition, the method similar to what was mentioned above about the fixing | fixed part 10 can be used for the fixing method of the reinforcement board 22 and the casing 3 by the fixing | fixed part 23. FIG.

  Even with the configuration of the third embodiment described above, when the hot water storage tank unit 21 falls in the vertical downward direction in a bent state, the stress in the vertical direction of the casing 3 is reduced by the buffer material 6 being compressed and deformed. In addition, the stress in the front-rear direction of the casing 3 can be alleviated by bending the four sides of the casing 3, the top surface 3a, and the reinforcing plate 22.

  More specifically, according to the configuration of the present embodiment, the impact applied in the front-rear direction of the casing 3 can be mitigated from being applied in the direction in which the side surfaces 3d and 3e of the casing 3 expand or narrow. Moreover, compared with the structure of Embodiment 1 and 2 mentioned above, although the capability to relieve the impact itself of the casing 3 in the front-back direction is reduced, the length of the reinforcing plate itself can be shortened, so a reinforcing plate is added. Accordingly, an increase in the weight of the entire casing 3 can be suppressed. As a result, the impact applied to the hot water storage tank unit 21 at the time of dropping can be reduced.

  By the way, in Embodiment 3 mentioned above, as a countermeasure which assumes the case where the hot water storage tank unit 21 falls in the vertical downward direction in a bent state, the left side surface 3d and the right side surface 3e are casings other than these side surfaces 3d and 3e. 3 is provided with a reinforcing plate 22 provided so as to bridge without passing through the other surface. According to such a configuration, as described above, the impact applied in the front-rear direction of the casing 3 can be mitigated from being applied in the direction in which the side surfaces 3d, 3e of the casing 3 are expanded or narrowed. This is also effective as a countermeasure assuming a case where the tank unit 21 falls in the vertical downward direction with the back bent. In the configuration shown in FIG. 6, the reinforcing plate 22 is installed so as to bridge the left side surface 3d and the right side surface 3e through the space between the hot water storage tank 2 and the front surface 3b of the casing 3. Instead of such a configuration, the reinforcing plate 22 may be installed so as to bridge the left side surface 3d and the right side surface 3e through the space between the hot water storage tank 2 and the back surface 3c of the casing 3.

  In addition, the present invention is not limited to the above-described configuration. For example, the front surface 3b and the back surface 3c may be used as countermeasures assuming that the hot water storage tank unit falls vertically downward in a sideways state to the left or right. May be provided with a reinforcing plate (reinforcing member) provided so as to bridge without passing through other surfaces of the casing 3 other than the front surface 3b and the back surface 3c. In this case, the reinforcing plate (reinforcing member) is installed so as to bridge the front surface 3b and the back surface 3c through the space between the hot water storage tank 2 and the left side surface 3d of the casing 3. It may be installed through the space between the hot water storage tank 2 and the right side surface 3e of the casing 3 so as to bridge the front surface 3b and the back surface 3c.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a diagram schematically showing a configuration of a characteristic portion in hot water storage tank unit 31 according to Embodiment 4 of the present invention. The hot water storage tank unit 31 is configured in the same manner as the hot water storage tank unit 1 shown in FIGS. 1 to 4 except for the difference in the configuration of FIG. 7 from the configuration of FIG.

  As shown in FIG. 7, the reinforcing plate 32 of the present embodiment is formed to be curved in a substantially U shape, and the left side surface 3 d, the top surface 3 a, and the right side surface 3 e are bridged using three fixing portions 33. It is provided inside the casing 3 so as to pass. More specifically, the reinforcing plate 32 is fixed to the left side surface 3d and the right side surface 3e using the fixing portions 33 in the vicinity of both ends thereof, and fixed to the top surface 3a at the substantially U-shaped apex. ing. With such a configuration, the reinforcing plate 32 is fixed to the inside of the casing 3 in such a manner that the reinforcing plate 32 can be bent when an impact load is applied to the casing 3. In addition, the method similar to what was mentioned above about the fixing | fixed part 10 can be used for the fixing method of the reinforcement board 32 and the casing 3 by the fixing | fixed part 33. FIG. Here, only the cross-sectional view of FIG. 7 is shown, but the reinforcing plate 32 is interposed between the front surface 3b of the casing 3 and the hot water storage tank 2 so as not to interfere with the tank heat insulating material 2a covering the hot water storage tank 2. It is installed in the existing space.

  According to the configuration of the fourth embodiment described above, when the impact load is applied to the hot water storage tank unit 31 due to the fall, the shock absorbing material 6 is compressed and deformed, whereby the impact in the vertical direction of the casing 3 can be reduced. . Further, the bending of the reinforcing plate 32 can alleviate the impact applied in the vertical direction of the casing 3 in the direction in which the side surfaces 3d and 3e of the casing 3 expand or narrow. Also with this configuration of the present embodiment, it is possible to obtain a structure that enables both protection of the hot water storage tank 2 built in the hot water storage tank unit 31 and prevention of breakage or buckling deformation of the casing 3 itself.

  By the way, in Embodiment 4 mentioned above, the reinforcement board provided so that the left side 3d, the top surface 3a, and the right side 3e might be bridged as a countermeasure when an impact load acts on the hot water storage tank unit 31 by dropping. 32 is provided. However, the configuration of the present invention as a countermeasure in such a case is not limited to the above, and is provided to bridge the front surface 3b, the top surface 3a, and the back surface 3c of the casing 3, for example. It may be provided with a reinforcing plate (reinforcing member).

  In the description of the first to fourth embodiments so far, when a drop impact or transportation vibration is applied to the hot water storage tank unit 1 or the like, the impact acting on the casing 3 is mitigated by the bending of the reinforcing plate 9 or the like. Stated. Furthermore, the reinforcing member in the present invention is provided for at least one of the front surface, the back surface, the left side surface, and the right side surface of the casing in a state where an impact load is not applied to the casing (a normal no-load state). The tension may be applied in the inner or outer direction of the casing. Specifically, the configuration of the first embodiment will be described as an example. The reinforcing plate 9 is provided with tension that pushes the side surfaces 3d and 3e of the casing 3 outward, or tension that pulls inward. 9 and the fitting state at the time of installation of the reinforcing plate 9 inside the casing 3 may be adjusted. By applying such tension, the impact resistance of the box-shaped casing 3 can be improved.

  Moreover, in Embodiment 1-4 demonstrated above, the description which made object the hot water storage tank unit 1, 11, 21, 31 which contains the hot water storage tank 2 was performed. However, the casing unit that is the subject of the present invention is not limited to the hot water storage tank unit. For example, a product composed of a combination of a heavy body and a substantially box-shaped casing, such as a large air conditioner. The present invention can be similarly applied to the above. As a result, useless resources such as replacement due to defects in appearance and excessive packing can be suppressed.

1, 11, 21, 31 Hot water storage tank unit 2 Hot water storage tank 2a Tank insulation 2b Hot water storage tank leg 3 Casing 3a Casing top surface 3b Casing front surface 3c Casing back surface 3d Casing left side 3e Casing right side 3f Casing Bottom face 4 Piping connection part 5 Notch part 6 Casing material 7 Leg part 8 Casing fixing screw 9, 12, 22, 32 Reinforcing plate 9a First reinforcing plate 9b Second reinforcing plate 10, 13, 23, 33 Fixed part

Claims (8)

A casing unit comprising a casing having a top surface, a front surface, a back surface, a left side surface, a right side surface and a bottom surface each formed in a plate shape, wherein a heavy object is accommodated in the casing,
The heavy object is fixed to the bottom surface,
A cushioning material installed between the heavy object and the top surface;
A reinforcing member provided inside the casing so as to bridge at least two of the top surface, the front surface, the back surface, the left side surface, and the right side surface without using the heavy object therebetween,
A casing unit comprising: A notch is provided in a part of at least one of the left side surface and the right side surface,
2. The casing unit according to claim 1, wherein at least one of the fixing portions between the reinforcing member and the casing is provided above the notches.   The casing unit according to claim 1 or 2, wherein the reinforcing member is provided so as to bridge the back surface, the left side surface or the right side surface, and the front surface.   The casing unit according to claim 1, wherein the reinforcing member is provided so as to bridge the left side surface, the front surface, and the right side surface.   2. The reinforcing member is provided so as to bridge the left side surface and the right side surface without passing through other surfaces of the casing other than the left side surface and the right side surface. Or the casing unit of 2.   The casing unit according to claim 1, wherein the reinforcing member is provided so as to bridge the left side surface, the top surface, and the right side surface.   The reinforcing member has an inner direction or an outer direction with respect to at least one of the front surface, the back surface, the left side surface, and the right side surface in a state where an impact load is not applied to the casing. The casing unit according to claim 1, wherein the casing unit is configured to apply tension to the casing unit.   The casing unit according to any one of claims 1 to 7, wherein the casing unit is a hot water storage tank unit including a hot water storage tank for storing hot water as the heavy object.

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