DE8713213U1 - Electric water heater - Google Patents

Description

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Description

Electric water heater

The invention relates to an electric water heater, in particular for surface mounting, with an outer casing on which an adjustment part is provided on the outside, which is coupled to a shaft of a temperature controller which is arranged at the bottom of the outer casing.

In such electric water heaters, the temperature controller, which can also be the on/off switch for the device, is located at the bottom of the outer casing because it is located there in the immediate vicinity of the flange to which the heating element and the temperature sensor of the device are attached, and of the other electrical devices. According to the state of the art, the adjustment part is a rotary handle that sits directly on the shaft of the temperature controller and is therefore located at the bottom of the outer casing.

In the case of a water heater that is intended for under-counter installation, arranging the adjustment part at the bottom of the outer casing is unfavourable, as operating the adjustment part is then cumbersome and its setting is difficult to control.

Placing the temperature controller at the top of the water heater would be disadvantageous, as there is not enough space at the top to accommodate the temperature controller and the temperature controller would then have to be connected to the functional parts located at the bottom of the water heater.

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DE-GM 18 77 090 describes a storage heater. A room temperature sensor is arranged at the bottom of the heater, which is connected to a rotary knob at the top of the device via a shaft and bevel gears. Such an arrangement cannot be transferred to an electric water heater because the structure of the housing of a storage heater and a hot water tank is different.

The object of the invention is to design an electric water heater, in particular for under-counter installation, in such a way that its temperature controller can be adjusted at the top of the outer casing.

According to the invention, the above object is achieved in a water heater of the type mentioned at the outset in that the adjusting part is designed as a slide which is movable within the outer casing in the direction of the height of the water heater and which has a handle member protruding at the top through the outer casing.

Such a slider can be easily adapted to the design of the outer casing. Its handle allows the temperature regulator underneath to be adjusted from above and allows the setting to be easily checked. The slider avoids the need for rotating transmission elements on the outer casing or inside the outer casing.

Advantageous embodiments of the invention result from the subclaims and the following description of an embodiment. The drawing shows:

Figure 1 an electric water heater in the section and

Figure 2 the slider forming its adjustment part in

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perspective view*

An electric water heater has a water tank (1) with an insulating layer^) which is enclosed by a housing (3). A cold water inlet (4) is connected to the top of the water tank (1), and a cold water outlet (not shown in detail) also opens out at the bottom.

At the bottom of the water tank there is a flange (5) which carries a heating element (not shown in detail) and a temperature sensor.

Below the flange, a switching chamber (6) is provided for the electrical equipment. A temperature controller (7) is arranged in the switching chamber (6). The switching chamber (6) is covered with a cap (8). On the outside of the cap (8) there are connection terminals (9) for a terminal cable (10) and a strain relief (11) for these.

A rod (12) of the temperature controller (7) projects through the cap (8) into a free space (13) in which the connection terminals (9) are also located. A gear wheel (14) is located on the rod (12) in the free space (13).

An outer casing (15) is pushed onto the housing (3) and over the cap (8). This covers the housing (3) on the top (16) and the front (17) as well as the cap (8) and its free space (13).

On the inside of the outer casing (15) a slide (18) is mounted as an adjustment element for the temperature controller (7) in the direction of the height of the water heater. The slide (18) has a guide cable (19) to which guide elements (20) of the outer casing (15) are assigned. The

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The slider (18) is provided with a row of teeth (21) which extends into the direction of the slider (18) and engages the gear wheel (14). The slider (18) is pressed against the gear wheel (14) in the area of its row of teeth (21) by means of a spring (22) arranged between it and the outer casing (15).

At the top of the slide (18) there is a handle (23) which projects outwards beyond a slot (24) in the outer casing (15). A seal (25) is arranged in the vicinity of the slot (24) between the outer casing (15) and the housing (3). In order to indicate the setting of the slide (18), a scale is provided next to the handle (23).

The slider (18) is a one-piece plastic part. This is stiffened in the area of the guide cable slots (19) by webs (26)*. In an area (27) between the handle member (23) and the guide slots (19), the slider (18) is elastically or flexibly bendable so that it adapts to a curvature (28) of the housing (3) and fits snugly against it.

When assembling the water heater, the slide (18) can be easily adjusted relative to the gear (14) of the temperature controller (7). To do this, the temperature controller^) or the gear (14) is brought to its end stop. The slide (dS) on the outer casing I (15) is then placed on the housing (3). The row of teeth (21) then engages with the gear (d4). The user can then select the desired setting of the temperature controller (7) using the handle (?3).

Claims (7)

Requirements Electric water heater 1. Electric water heater, in particular for under-counter installation, with an outer casing, on the outside of which an adjustment part is provided, which is coupled to a shaft of a temperature regulator, which is arranged at the bottom of the outer casing, characterized in that the adjustment part is designed as a slide (18) which is movable within the outer casing (15) in the direction of the height of the water heater and which has a handle (23) protruding at the top through the outer casing (15). 2. Water heater according to claim 1, characterized in that the slide (18) is guided on the inside of the outer casing (15). 3. Water heater according to claim 1 or 2, characterized in that the slide valve (2) is bendable in its region (27) adjoining the handle member (23). 4. Water heater according to one of the preceding claims, characterized in that the slide (1K) is stiffened by webs (26) in the area of guide slots (19). 5. Water heater according to one of the preceding claims, characterized in that the slide (1") has a row of teeth (2i) extending in its longitudinal direction at the bottom, with which it engages in a gear wheel (14) arranged on the shaft (i2) of the temperature controller (7) * • ( · I 6. Water heater according to one of the preceding claims, characterized in that the slide (18) is pressed against the gear (14) of the shaft (12) by means of a spring (22). 7. Water heater according to one of the preceding claims, characterized in that the outer casing (15) covers a cap (18) within which the temperature regulator (7) is arranged and which extends through the shaft (12) of the temperature regulator (7).