JPH0228357Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of a casing constituting an electric water heater as a pressure vessel installed below a wash basin or the like.

[Conventional technology]

As shown in FIG. 2, a housing 1 constituting a conventional electric water heater is formed into a generally cylindrical shape, consisting of circular upper and lower mirror plate portions 1a, 1b and a cylindrical body plate portion 1c. The reason for the cylindrical shape is that since the inside of the casing functions as a pressure vessel, it must have a pressure-resistant structure from the viewpoint of safety. That is, cylindrical and spherical containers can be manufactured relatively easily as pressure-resistant containers. Thus, the tap water pipe 2 is connected to the upper mirror plate portion 1a of the housing 1,
A drain pipe 3 is connected to the lower mirror plate portion 1b.
Further, a water supply pipe 4 and an electric heater 5 are connected to the lower part of the body plate portion 1c. The whole is housed in a rectangular heat insulating storage box 6.

[The problem that the idea attempts to solve]

However, since the conventional case 1 has a generally cylindrical shape, a wasted space is formed between the inner corner of the storage box 6 and the outer peripheral surface of the case 1, and the capacity of the case 1 is small compared to the capacity of the storage box 6. There was a drawback that the amount of hot water stored in the body 1 was significantly reduced. In order to solve this drawback, it may be possible to form the casing into a roughly rectangular prism shape (not shown), but in that case, the pressure resistance of the casing (for example,
7.5Kg/cm ² ), it is necessary to make the end plate and body plate thicker than those of the approximately cylindrical case, which not only makes them expensive but also heavy and difficult to handle during construction. There were some drawbacks that were inconvenient.

[Means to solve the problem]

The present invention improves and eliminates the above-mentioned conventional problems, and aims to provide a housing for an electric water heater that can have a large capacity and is sufficiently durable for practical use as a pressure vessel. be.

Therefore, the means adopted by the present invention in order to solve the above problem is to form the entire box into a vertically elongated approximately rectangular prism-shaped box with the upper and lower mirror plates and the intermediate body plate, and to form each corner into a curved surface. In a case for an electric water heater as a pressure vessel, in which a hot water outlet is formed in the upper end plate, a drain port is formed in the lower end plate, and a hot water supply port is formed in the lower side of the body plate, the body plate forming the case is In the right place on the inner circumferential surface,
An annular body plate reinforcing rib along the circumferential direction is welded, and on the inner surfaces of each of the upper end plate and the lower end plate,
End plate reinforcing ribs extending to the inner corners are welded on both sides, and water holes are bored in the end plate reinforcing ribs at appropriate pitches.

[Effect]

In the case of the present invention, the inner peripheral surface of the body plate is reinforced at appropriate places with annular body plate reinforcing ribs, making it possible to form a strong body even with a thin plate. Further, the inner surfaces of the upper end plate and the lower end plate are each reinforced with end plate reinforcing ribs, forming a strong end plate portion even with a thin plate thickness. Therefore, even if the housing of the present invention has a square column shape, it can have a pressure-resistant structure that can withstand practical use.

In addition, the water passage holes drilled in the upper end plate reinforcing ribs communicate with the upper area of the case divided by the reinforcing ribs so that water can pass through, and the hot water in the upper area where the hot water outlet is not opened is passed through the hot water outlet. Lead to the open upper area.
The water holes drilled in the reinforcing ribs on the lower end panel allow water to flow through the lower area inside the case divided by the reinforcing ribs, allowing hot water in the lower area where the drain opening is not open to be drained from the opening of the drain opening. lead to the lower area where it is located. Furthermore, each corner of the housing is formed into a curved surface. Therefore, the convection of water inside the case becomes smooth, and there is no problem such as a long boiling time.

〔Example〕

The configuration of the present invention will be explained below based on the embodiments shown in the drawings.

The housing 7 is made of stainless steel or the like, and has upper and lower mirror plates 8 and 9 with curved corners joined to the top and bottom of a generally square cylindrical body plate 10 with curved corners by butt welding 18 and 19 or the like. In this way, an appropriate hot water storage capacity (for example, 13 liters) is secured.
Annular shell plate reinforcing ribs 15, 15 made of band plates and extending along the circumferential direction are welded in advance at appropriate pitches 21, 21, . The upper head plate 8 has the tap water pipe 2 connected near the corner on the long side, and is made of a band plate near the center of the inner surface, and the head plate reinforcing ribs 16 along the long side direction are welded 22, 22, 22... has been done. Mirror plate reinforcement rib 1
6 has a water passage hole 1 with an appropriate inner diameter (for example, 5 mmφ).
6a, 16a... are bored at appropriate pitches.
The lower head plate 9 has a drain pipe 3 connected to the corner on the long side, and a head plate reinforcing rib 17 made of a band plate along the long side direction is welded 23, 23 in advance at an appropriate pitch near the center of the inner surface. ...has been done. The end plate reinforcing rib 17 is provided with water passage holes 17a, 17a, . . . in the shape of notches and round holes at appropriate pitches. The housing 7 of this embodiment has these reinforcing ribs 1.
5, 16, and 17, it is possible to obtain an excellent pressure-resistant structure. A water supply pipe 4 is connected to the body plate 10 on the lower long side, and an electric heater mounting flange 20 is provided on the lower short side. Note that leg portions 24, 24, 24 are provided at the bottom of the lower mirror plate 9 as necessary.

Next, the operation mode of the housing 7 configured as described above will be explained. Electric heater mounting flange 20
An electric heater (not shown) is attached to the housing 7 so that its heat-generating portion faces the inside of the housing 7. When hot water is supplied, water supplied into the housing from the water supply pipe 4 is heated by an electric heater (not shown), turns into hot water, rises inside the housing, and reaches upper areas A and B. In this case, each corner of the housing 7 is formed into a curved surface, and the reinforcing ribs 16 and 17 are provided with water passage holes 16a and 17a, so that the water and hot water inside the housing 7 can be Convection becomes smooth and the time required for heating does not increase. That is, efficient hot water heating is possible. The hot water that has reached the upper area B directly flows out from the hot water outlet 11 to the hot water outlet pipe 2, and the hot water that has reached the upper area A flows through the water passage hole 1 of the head plate reinforcing rib 16.
6a, 16a, . . . and the upper region B, and flows out into the tapping pipe 2. When draining water, open a water stop plug (not shown) installed at an appropriate location on the drain pipe 3, and drain the remaining water inside the housing from the drain port 12 to the drain pipe 3.The water remaining in the lower area C will be drained from the end plate. The water passes through the water holes 17a, 17a, . . . of the reinforcing rib 17 and the lower area D and is discharged.

[Effect of idea]

As explained above, the electric water heater casing according to the present invention has the following practical effects.

The body plate is reinforced with an annular body plate reinforcing rib, and the upper and lower head plates are reinforced with head plate reinforcing ribs, so even with a thin body plate and head plate, a roughly rectangular prism-shaped case with an excellent pressure-resistant structure is provided. This allows for effective use of containers. Therefore, it is possible to provide a casing with a pressure-resistant structure that is inexpensive, lightweight, and excellent in size reduction.

Since the water passage holes are formed in the reinforcing ribs of the end plate, smooth discharge of hot water in the upper region of the housing is guaranteed, and complete drainage of residual water in the lower region of the housing is guaranteed.

Moreover, by making these water passage holes and each corner of the case curved, smooth convection of water or hot water within the case can be obtained, and efficient hot water heating is possible.

[Brief explanation of drawings]

1A to 1C show an embodiment of the electric water heater casing according to the present invention, in which FIG. 1A is a plan sectional view, FIG. 1B is a front sectional view, and FIG. 1C is a side partial sectional view. , Fig. 2 shows a washstand with a conventional electric water heater housing built-in. 7... Housing, 8... Upper end plate, 9... Lower end plate, 10
... Body plate, 11... Outlet, 12... Drain port, 13... Water supply port, 15... Body plate reinforcing rib, 16, 17... End plate reinforcing rib, 16a, 17a... Water hole.

Claims (1)

[Scope of utility model registration request] The upper and lower head plates and the middle body plate form a vertically elongated, approximately rectangular prism-shaped box, each corner of which is formed into a curved surface, an outlet is formed in the upper head plate, a drain is formed in the lower head plate, and the body In a case for an electric water heater as a pressure vessel having a hot water supply port formed on the lower side of the plate,
An annular body plate reinforcing rib along the circumferential direction is welded to an appropriate position on the inner peripheral surface of the body plate forming the housing, and is provided on each inner surface of the upper end plate and the lower end plate, extending to the inner corner on both sides. A case for an electric water heater, characterized in that a reinforcing rib for an electric water heater is welded to the reinforcing rib for an electric water heater, and water holes are formed in the reinforcing rib for the end plate at appropriate pitches.