JP7145387B2 - Outer case for hot water unit and hot water unit provided with the same - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water unit, such as a hot water supply apparatus and a cogeneration system, in which a hot water generating or hot water storage device is housed in an outer case, and to the outer case.

As a specific example of a hot water unit configured as a hot water supply device, for example, there is a hot water device that heats hot water using combustion gas generated by a burner, and is housed in an exterior case (for example, Patent Documents 1 to 3). 3). Such an exterior case for a hot water unit is generally manufactured by press-working a colored steel plate having a monochromatic surface.

In such a hot water unit, for example, letters and symbols indicating the manufacturer name, type, capacity, etc. of the hot water unit are displayed on the exterior case, and a wide range of the surface of the exterior case is different from the ground color of the surface of the colored steel plate. Different predetermined colors may be required. In this case, conventionally, after the component parts of the exterior case (the exterior case main body and the cover body) are formed by press molding, the component parts are spray-painted.

However, the prior art has room for improvement as described below.

That is, when the conventional spray-type coating means is used, not only masking the non-coated portion and color matching of the paint are troublesome, but also the work of spraying the paint using a spray gun (air gun) is troublesome. Yes, and it requires skill. Therefore, workability and productivity are poor. In addition, since the paint is also sprayed onto the masking portion, much of the paint is wasted. Therefore, the manufacturing cost of the exterior case and the manufacturing cost of the hot water unit are high. Such a problem becomes more conspicuous as the pattern to be painted becomes more complicated and the number of colors increases, making it difficult to express detailed patterns.
Conventionally, a transfer-type coating means has also been appropriately adopted, but this type of coating means requires a transfer plate, resulting in high costs. Moreover, there is also a problem that it is unsuitable for painting a large area.
In addition, the coating applied to the exterior case is easily damaged by the influence of wind and rain, sunlight including ultraviolet rays, etc., and easily causes contamination and discoloration.

JP 2012-32029 A JP-A-11-294867 JP 2014-40950 A

The present invention has been conceived under the circumstances as described above, and even in the case of attaching a complicated pattern, it is possible to appropriately manufacture with high productivity and low cost by a simple work process. It is an object of the present invention to provide an exterior case for a hot water unit and a hot water unit having the same, which can improve the overall design of the hot water unit.

In order to solve the above problems, the present invention takes the following technical means.

An exterior case for a hot water unit provided by the first aspect of the present invention is an exterior case for a hot water unit used to house a hot water device for hot water generation or hot water storage, wherein the exterior The case is constructed using a metal plate, and a paint layer is provided on at least one of the outer surface and the inner surface of the metal plate. , or a pattern, and a clear layer covering the inkjet printed layer . In the portion where the plate thickness of the metal plate is thinner than the other portion, the thickness of the ink-jet printed layer is also thinner than the other portion .
Here, the ink-jet printed layer is a printed layer formed by spraying ink droplets made into fine droplets onto a region to be coated using an ink-jet printer.

According to such a configuration, the following effects are obtained.
That is, since the inkjet printing layer is further provided on the paint layer provided on at least one of the outer surface and the inner surface of the metal plate constituting the outer case, desired characters, symbols, drawings, or patterns can be appropriately printed. It is possible to express As the metal plate provided with the paint layer, for example, a colored steel plate can be used as it is. On the other hand, the inkjet-printed layer can be easily provided using an inkjet printer, and unlike conventional spray-based painting, there is no need for masking the outer case or color matching of the paint. No skill is required. In addition, unlike conventional transfer-type coating, a transfer plate is not required, and a wide area can be easily coated. Therefore, workability of painting is good, and the productivity of the exterior case can be improved. Furthermore, since the ink-jet printed layer can be provided only at desired locations, waste of the ink paint can be eliminated or reduced. As a result, it is possible to reduce the manufacturing cost of the exterior case and, in turn, the manufacturing cost of the hot water unit.
In addition, the inkjet printed layer enables detailed expression of patterns with complex shapes and patterns that use many colors, which is more preferable for improving the external appearance of the hot water unit. In particular, according to the present invention, the presence of the clear layer enables various expressions such as glossy and matte, which is more preferable.
The inkjet printing layer can be protected by a clear layer, which prevents it from being easily damaged by the effects of wind and rain, and can also enhance weather resistance and provide stain resistance. .
Furthermore, according to such a configuration, the following effects can be obtained.
That is, in the case where the drawn portion is provided after the ink jet printed layer is provided on the outer case, if the thickness of the entire ink jet printed layer of the drawn portion is large and uniform, the drawing amount of the metal plate is reduced. There is a risk that the ink-jet printed layer will peel off in the increased portion (the portion where the plate thickness is thinner than the other portions in the drawn portion). On the other hand, according to the said structure, it is possible to avoid such a possibility appropriately.

Preferably, the clear layer contains an ultraviolet absorber.

With such a configuration, it is possible to appropriately prevent the ink-jet printed layer from fading due to irradiation with ultraviolet rays contained in sunlight or the like.

Preferably, an exterior case for a hot water unit according to the present invention includes an exterior case body having an opening on at least one side thereof, and a cover body attached to the exterior case body so as to close the opening. At least one of the exterior case main body and the cover body is provided with the ink-jet printed layer and the clear layer.

Preferably, the exterior case for a hot water unit according to the present invention includes a burring hole having a burring portion protruding from the peripheral edge portion, and the burring portion includes an ink-jet printed layer provided around the burring hole. A continuous inkjet printed layer is provided and these inkjet printed layers are successively covered by the clear layer.

According to such a configuration, the peripheral portion of the burring hole and the burring portion can be painted in a continuous color or pattern, and the external appearance of this portion can be improved. is. Unlike the above configuration, for example, if the inkjet printed layer is provided only around the burring hole and the burred portion is not provided with the inkjet printed layer, the burring portion may be seen as an unsightly portion from the outside. However, according to the above configuration, it is possible to eliminate such concerns. In addition, the ink-jet printed layer originally provided in the burring portion and the like is prone to peeling and cracking. can also make it difficult to generate

Preferably, at least a part of the component parts of the exterior case for a hot water unit according to the present invention is a pressed product, and the ink-jet printed layer serves as a positioning mark when pressing the component parts. is provided.

According to such a configuration, when forming the component parts of the exterior case by press working, the press work can be performed with reference to the positioning mark represented by the ink-jet printed layer. Therefore, it is possible to precisely align the characters, patterns, etc., represented by the ink-jet printed layer and the processed portion by press working, and prevent them from being greatly misaligned.

Preferably, the inkjet print layer contains an ultraviolet curable resin.

According to such a configuration, it is possible to cure the inkjet printed layer at an early stage by irradiating with ultraviolet rays. Therefore, during inkjet printing, for example, the inkjet printing layer can be irradiated with ultraviolet rays to cure the inkjet printing layer while proceeding with the inkjet printing. If a new inkjet-printed layer having a different color or the like is provided in an area adjacent to the uncured inkjet-printed layer, bleeding may occur. As it progresses, it is possible to prevent the bleeding described above from occurring.

Preferably, the inkjet print layer contains a thermosetting resin.

According to such a configuration, after the inkjet printing is completed, the inkjet printed layer is heated to cure the thermosetting resin, thereby increasing the strength of the inkjet printed layer and making it excellent in weather resistance and the like. is possible.

The hot water unit provided by the second aspect of the invention is characterized by comprising an exterior case for the hot water unit provided by the first aspect of the invention.

According to such a configuration, the same effect as described for the exterior case for the hot water unit provided by the first aspect of the present invention can be obtained.

Other features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings.

(a) is a side view showing an example of a hot water unit according to the present invention, and (b) is an exploded perspective view of an exterior case of the hot water unit shown in (a) (in which the water heater inside is omitted). is. (a) is a side view of FIG. 1(a) with the clear layer omitted, and (b) is an exploded perspective view of FIG. 1(b) with the clear layer omitted. (a) is a front view of the cover body of the exterior case shown in FIG. 1 with the clear layer omitted, and (b) is a front view of the cover body with the ink-jet printed layer omitted. (a) is an IVa-IVa cross-sectional view of FIG. 3(a), (b) is a IVb-IVb main part cross-sectional view of FIG. 3(a), and (c) is a cross-sectional view of FIG. 3(a). 3(d) is a front cross-sectional view of the portion indicated by symbol IVd in FIG. 3(a). It is a rear view of the cover body shown to Fig.1, FIG.2 and Fig.3 (a). (a) to (g) are explanatory diagrams showing an example of a manufacturing process of the cover body shown in FIGS. 1, 2 and 3 (a). FIG. 4 is a cross-sectional view of a main part showing an example of a color steel plate used for manufacturing the cover body shown in FIGS. 1, 2 and 3(a); (a) is a perspective view showing an example of the schematic configuration of a printer used for inkjet printing, and (b) is a view of arrow VIIIb in (a), showing the print head of the printer shown in (a). It is a diagram showing a schematic structure of. FIG. 4C is a cross-sectional view of a main part showing an example of a working process for obtaining the structure of FIG. 4(c);

Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

A hot water unit U shown in FIGS. 1 and 2 is a hot water supply apparatus, and has a configuration in which a water heater 1 for hot water generation is housed in an exterior case C. As shown in FIG. The water heater 1 includes a heat exchanger 10 through which hot water flows, a burner 11 for heating the hot water in the heat exchanger 10, a fan 12 for supplying combustion air to the burner 11, and the like.

The exterior case C includes a rectangular box-shaped exterior case main body 2 having an opening 20 on the front surface, and a cover body 3 (front cover body) that closes the opening 20 . The cover body 3 is detachably attached to the front surface of the exterior case body 2 by using screw bodies 9 such as screws and screw insertion holes 31 and 21 through which the screw bodies are inserted.

In this embodiment, the cover body 3 is provided with an ink-jet printed layer 4 (in the drawing, the portion marked with a halftone dot pattern or a wavy line pattern) and a clear layer 5 . It is not provided in the exterior case main body 2 . Therefore, hereinafter, the configuration of the cover body 3 will be described in detail, and the description of the exterior case main body 2 will be omitted. However, as will be described later, the exterior case main body 2 may of course be provided with an ink-jet printed layer or a clear layer.

The cover body 3 includes an inkjet-printed layer 4 (4a to 4g) (see also FIGS. 3 and 5) on a press-molded color steel plate 30 (which corresponds to an example of a metal plate provided with a paint layer), which will be described later. and a clear layer 5 are provided. However, when manufacturing the cover body 3 in the present embodiment, as will be described later, the color steel plate 30 is press-worked after the inkjet-printed layer 4 is provided, and the clear layer 5 is provided after this press-working. .

The cover body 3 has a panel shape that is substantially rectangular in front view, and is surrounded by an outer peripheral flange portion 32, and further forward of the outer peripheral flange portion 32 (on the front side of the exterior case C). and a bulging bulging portion 33 . The outer peripheral flange portion 32 is a portion to be brought into contact with the substantially rectangular frame-shaped flange portion 22 provided on the front portion of the exterior case main body 2, and as shown in FIG. is continuously provided with a folded portion 32a by hemming.

A bulging portion 33 of the cover body 3 occupies most of the cover body 3, and the bulging portion 33 is provided with an air supply port 34 and an air exhaust port 35 (see also FIG. 3). The air supply port 34 is a part that allows outside air to flow into the exterior case C. As shown in FIG. The exhaust port 35 is a portion for discharging the exhaust gas after heat recovery by the heat exchanger 10 to the outside of the exterior case C, and as shown in FIG. 35a are formed as continuous burring holes. The air supply port 34 can also be a burring hole like the exhaust port 35 .

The inkjet printed layer 4 is a coating film layer provided using an inkjet printer 8 as described later. As the ink for inkjet printing, it is possible to use a water-based pigment ink or a solvent-based pigment ink. .

Inkjet-printed layers 4, which are provided on the surface of the cover body 3, include ink-jet-printed layers 4a to 4d representing a predetermined pattern D1 such as a penguin, and characters such as the manufacturer, model, or trademark of the hot water unit U. An ink-jet printed layer 4e is provided which is denoted D2 (in the drawings, "AABBCC" as an example). Further, at the four corners of the cover body 3, there are provided ink-jet printed layers 4f representing positioning marks D3 during press working, which will be described later. Although the positioning mark D3 is shown in the shape of + in the drawing, it is not limited to this. Further, the positioning mark D3 may be provided on the rear surface of the cover body 3 instead of or in addition to the front surface of the cover body 3. FIG.

As shown in FIG. 5, the back surface of the cover body 3 is further provided with an inkjet printed layer 4g representing an electric wiring diagram D4 of the water heater 1. As shown in FIG. Instead of or in addition to the electric wiring diagram D4, it is also possible to have a configuration representing a piping diagram of the water heater 1. FIG. Although not shown, the rear surface of the cover body 3 may be provided with an ink-jet printed layer indicating the specifications of the hot water unit U, notes, etc., in addition to the electrical wiring diagram D4 and the piping diagram. It is possible.

As shown in FIG. 7, the color steel plate 30 as a raw material of the cover body 3 includes a plated steel plate 30a, a white (including white) front paint layer 30b laminated on the surface of the plated steel plate 30a, and a plated steel plate. It is a multi-layer structure having a paint layer 30c on the back side as a service coat laminated on the back side of 30a. The ink-jet printed layers 4a to 4e are different in color from the white front paint layer 30b, and represent the pattern D1 such as the above-described penguin figure and the letters D2. A white portion in FIG. 3(a) is a portion of the front side paint layer 30b of the color steel plate 30 that is not subjected to inkjet printing.

The ink-jet printed layers 4a are basically formed to have the same color and the same thickness over the entire area. However, as shown in FIG. 4D, the thickness ta of the corner portion 33a' of the peripheral wall portion 33a (the wall portion standing forward from the outer peripheral flange portion 33) of the bulging portion 33 is and the thickness of the portion other than the peripheral wall portion 33a. The bulging portion 33 is formed by drawing, and the peripheral wall portion 33a thereof corresponds to an example of the drawn portion in the present invention. (The corner portion 33a' corresponds to an example of "a portion of the drawn portion formed to be thinner than the other portions" in the present invention). If the thickness ta of the inkjet printed layer 4a at the corner portion 33a' is reduced corresponding to this, the peeling prevention effect of the inkjet printed layer 4a can be obtained as described later. In addition, when the amount of narrowing (extending amount) of the entire peripheral wall portion 33a is increased in order to increase the amount of swelling of the swelling portion 33, the thickness tb of the portion other than the corner portion 33a' of the peripheral wall portion 33 is set to It may be thinner than the thickness of other portions of the inkjet printing layer 4a.

The inkjet printing layer 4b is provided around the exhaust port 35. As described with reference to FIG. 4(c), the exhaust port 35 is formed as a burring hole having a burring portion 35a. . On the other hand, part of the inkjet printed layer 4b is also provided on the inner surface of the burring portion 35a. As a result, the peripheral portion of the exhaust port 35 and the inner surface of the burring portion 35a can be made to have the same color, and the exhaust port 35 and its peripheral portion can be improved in appearance.

The inkjet print layer 4e is provided on the front surface of the stepped portion 36 (see also FIGS. 3(b) and 4(b)) that three-dimensionally represents the character D2. More specifically, the stepped portion 36 is a portion in which the character D2 is three-dimensionally shaped by partially extruding a part of the color steel plate 30 by press working, and the inkjet printed layer 4e It is provided on the front surface of the step pressing portion 36 as described above. As the step pressing portion 36, there is a convex form on the front side in which a part of the color steel plate 30 is pushed out to the front side of the cover body 3, and a front face in which a part of the color steel plate 30 is pushed out to the rear side of the cover body 3. There is a side concave shape, but any of them may be used.

The clear layer 5 is formed over substantially the entire front surface of the cover body 3 so as to cover the inkjet print layer 4 . As shown in FIG. 4(b), the clear layer 5 is also formed in the concave portions of the regions where the characters D2 are to be formed. Further, as shown in FIG. 4C, the clear layer 5 is also provided on the inner surface of the burring portion 35a. It covers the inkjet printing layer 4 etc. in series. The back surface of the cover body 3 is not provided with the clear layer 5 because it is not directly exposed to wind, rain or sunlight. However, the clear layer 5 may be provided on the rear surface of the cover body 3 to protect the ink-jet printing layer 4g. In this case, instead of providing the clear layer 5 on the entire back surface, it is also possible to provide a configuration in which the clear layer 5 is provided only in the area where the ink-jet printing layer 4g is provided.
The clear layer 5 is made of resin paint containing no pigment, but contains an ultraviolet absorber. The clear layer 5 is made of thermosetting resin or ultraviolet curable resin.

The cover body 3 described above can be manufactured through the following steps.

First, as shown in FIG. 6A, as a raw material for the cover body 3, the plate-like color steel plate 30 described with reference to FIG. 7 is prepared. Next, by performing inkjet printing on the color steel plate 30 (strictly speaking, on the paint layers 30b and 30c of the color steel plate 30), an ink jet printed layer 4 is provided as shown in FIG. Ink jet printing is performed using an ink jet printer 8 as shown in FIG. 8(a), for example. The ink jet printer 8 has a print head 80 which is movable in the x and y directions perpendicular to each other above a mounting table 81 on which the color steel plate 30 is mounted and supported. As shown in FIG. 8B, the print head 80 is equipped with a plurality of inkjet nozzles 82 for forming droplets of inkjet paint of a predetermined color and spraying them toward the color steel plate 30. This point is conventionally known. , but in this embodiment, a pair of ultraviolet light sources 83 (83a, 83b) are further provided.

For example, when performing inkjet printing while moving the print head 80 in the x1 direction of FIG. Irradiate with UV light. Since the inkjet printing layer 4 contains an ultraviolet curable resin, the inkjet printing layer 4 can be rapidly cured (cured to the extent that bleeding does not occur as described later) by the irradiation of the ultraviolet rays. Therefore, it is possible to prevent the uncured ink-jet printed layers 4 having different colors from being mixed with each other and causing bleeding. When ink jet printing is performed in the direction opposite to the x1 direction, the same effect as described above can be obtained by emitting light from the ultraviolet light source 83b instead of the ultraviolet light source 83a.

In addition, when the inkjet printing layer 4a is provided, the thickness ta of the color steel plate 30 at the planned corner portion 33a' of the peripheral wall portion 33a shown in FIG. thinner than

After completing the above-described inkjet printing on both the front and back surfaces of the color steel plate 30, as shown in FIG. The contained thermosetting resin is cured. This heating is performed using, for example, a heating furnace. By such treatment, the strength of the ink-jet printing layer 4 can be increased, and in addition, it can be made to have durability against the subsequent press working.

Next, the color steel plate 30 is subjected to drawing as press working to form an outer peripheral flange portion 32 and a bulging portion 33 as shown in FIG. 6(d). After that, as shown in FIG. 6( e ), press work to form the air supply port 34 , the exhaust port 35 , and the stepped portion 36 , trimming to remove the excess portion of the outer peripheral flange portion 32 , and then Hemming of By this, the above-described cover body 3 can be manufactured. In the work process described above, the color steel plate 30 can be accurately positioned with reference to the positioning mark D3. Further, as shown in FIG. 9, for example, the work of forming the exhaust port 35 is performed using a punch 7a and a die 7b. Since the inkjet printed layer 4b is also provided in a series at the location, as shown in FIG. can be properly implemented.

After finishing the outer shape of the cover body 3 as described above, as shown in FIG. . A clear paint is mainly composed of a thermosetting resin (or an ultraviolet curable resin) containing an ultraviolet absorber. Clear coating is, for example, spray coating in which a clear paint is sprayed from a spray nozzle 88 . After finishing this clear coating, the clear layer 5 is heated to dry and harden as shown in FIG. 6(g). Heating is, for example, heating using a heating lamp. Unlike the above, when the clear layer 5 is made of an ultraviolet curing resin, it is cured by ultraviolet irradiation.

Next, the operation of the exterior case C having the cover body 3 and the operation of the hot water unit U will be described.

First, since the design D1 of a penguin or the like is displayed on the front surface of the cover body 3, the design of the hot water unit U is improved compared to, for example, the cover body 3 having a single color and no pattern on the surface. It is possible to do better. Since the inner surface of the burring portion 35a of the exhaust port 35 is painted continuously with the peripheral portion of the exhaust port 35, the inner surface of the burring portion 35a may have a different color from the peripheral portion of the burring portion 35a. Appearance is also good in comparison. Further, a corner portion 33a' of the peripheral wall portion 33a has a part of the color steel plate 30 that is greatly extended by drawing. Therefore, it is possible to avoid the possibility that the ink-jet printing layer 4 is likely to peel off due to the above-described drawing process.

Since the electric wiring diagram D4 or the piping diagram is represented by the ink jet printed layer 4g on the back surface of the cover body 3, it is convenient for maintenance work. For example, if a sheet on which an electrical wiring diagram is printed is attached to the back surface of the cover body 3, there is a risk that the sheet will be damaged or peeled off from the cover body 3 and lost. There is no such fear.

Since the coating layers representing the pattern D1, the characters D2, the positioning marks D3, the electric wiring diagram D4, etc. of the cover body 3 are all made of the ink jet printing layer 4, the ink jet printer 8 as described above is used. can be easily provided. For example, unlike spray coating, no masking or color matching is required, nor is skill required. Therefore, workability and productivity can be improved. In addition, it is easy to change the design of the pattern D1, etc., and it is suitable for small-lot production of a wide variety of products. In addition, ink jet printing is economical with no or little waste of ink paint. Since the base of the inkjet printed layer 4 is the paint layers 30b and 30c of the color steel plate 3, it is possible to improve the appearance and weather resistance of the portions where the inkjet printed layer 4 is not provided.

The clear layer 5 enables various expressions such as glossy and matte, and further improves the design of the exterior case C. Further, since the clear layer 5 covers and protects the inkjet printed layer 4 on the front surface of the cover body 3, the weather resistance of the inkjet printed layer 4 is increased and the stain resistance is excellent. In particular, since the clear layer 5 contains an ultraviolet absorber, the color of the ink-jet printing layer 4 is not faded by the ultraviolet rays of the sun. In addition, the clear layer 5 also has the effect of suppressing the occurrence of peeling and cracking of the inkjet printed layer 4. However, since the clear layer 5 is provided over substantially the entire front surface of the cover body 3, the above effect is becomes better.

The invention is not limited to the content of the embodiments described above. The exterior case for the hot water unit according to the present invention and the specific configuration of each part of the hot water unit can be varied in design in various ways within the intended scope of the present invention.

In the above-described embodiment, an example in which only the cover body 3 is subjected to inkjet printing or clear coating is shown. may of course be applied. Clear coating may be applied to the exterior case main body without inkjet printing. The specific contents of characters, patterns, and the like represented by the ink-jet printed layer of the present invention are not limited as long as at least one of characters, symbols, drawings, or patterns is represented. The clear layer may be colored and transparent instead of colorless and transparent.

The hot water unit according to the present invention is a hot water storage tank in which a hot water storage device for storing hot water such as a hot water storage tank is housed in an exterior case instead of a hot water supply device or the like in which a water heater for hot water generation is housed in the exterior case. It can also be configured as a unit or the like. Therefore, the exterior case is not limited to a combination of an exterior case main body having a front opening and a cover body closing the front opening.
A flat metal plate is used as the material of the exterior case, and it is possible to use a material other than the commercially available color steel plate as the metal plate.

U Hot water unit C Exterior case D1 Design D2 Letter D3 Positioning mark D4 Electric wiring diagram 1 Water heater 2 Exterior case body 20 Opening (of exterior case body)
3 cover body 30 color steel plates 30b, 30c paint layer 33a peripheral wall portion (drawn portion)
33a' corner of peripheral wall (drawing portion)
35 exhaust port (burring hole)
35a Burring part 4 (4a to 4g) Inkjet printing layer 5 Clear layer

Claims (6)

An exterior case for a hot water unit used to house a hot water device for hot water generation or hot water storage, comprising:
The exterior case is constructed using a metal plate, and a paint layer is provided on at least one of the outer surface and the inner surface of the metal plate,
an inkjet printing layer laminated on the paint layer and representing at least one of characters, symbols, drawings, or patterns;
A clear layer covering the inkjet printing layer,
and
This exterior case has a drawn part,
In the drawn portion, the thickness of the ink-jet printing layer is also thinner in a portion where the thickness of the metal plate is thinner than that of the other portion. Outer case for the unit. An exterior case for a hot water unit according to claim 1,
An exterior case for a hot water unit, wherein the clear layer contains an ultraviolet absorber. An exterior case for a hot water unit according to claim 1 or 2,
The exterior case includes an exterior case body having an opening on at least one side thereof, and a cover body attached to the exterior case body so as to close the opening,
An exterior case for a hot water unit, wherein the ink-jet printed layer and the clear layer are provided on at least one of the exterior case main body and the cover body. An exterior case for a hot water unit according to any one of claims 1 to 3,
It has a burring hole with a burring part protruding from the peripheral edge,
The burring part is provided with an inkjet-printed layer connected to the inkjet-printed layer provided in the peripheral part of the burring hole, and these inkjet-printed layers are continuously covered with the clear layer. exterior case. An exterior case for a hot water unit according to any one of claims 1 to 4,
At least part of the component parts of this exterior case is a pressed product,
An exterior case for a hot water unit , wherein the inkjet printed layer is provided with a positioning mark for pressing the component . A hot water unit comprising the exterior case for the hot water unit according to any one of claims 1 to 5 .

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