DE3218863A1 - Electric flow heater - Google Patents

Abstract

In an electric flow heater, vapour bubble formation is to be reduced by a helical water flow. To this end, the inflow pipe (3) extends parallel to the longitudinal axis (2) of the container (1). It has along its height a large number of radial bores (4). Hairpin-shaped tubular heating bodies (5) run parallel to the inflow pipe (3). <IMAGE>

Description

• t »It

STIEBEL E LT RON GmbH & Co. KG Holzminden / Weser

April 15, 1982 Act 591

Electric water heater

The invention relates to an electric water heater with a cylindrical water tank, a Inlet pipe for the water to be heated and a helical water flow in the container.

Such a water heater is described in DE-AS 12 71 58Ί. With this one is on the outside A spiral-wound tubular heating element is soldered onto the tubular jacket. In the pipe jacket is a water screw arranged, through which a swirling of the water to be heated is to be achieved. The possible The specific heating power of the electric heater is limited because it is only one side of the heater to be heated Water is cooled. The water supply screw entails additional construction and assembly work.

In CH-PS 289 313 a water heater is described, in the case of heat from both sides of a radiator

is discharged. A concentric to the container ;;

arranged inlet pipe has several bores. f

The water is diverted around the radiator. A helical flow does not occur here.

In the case of flow heaters known on the market, the cold water enters the container freely and mainly flows under the effect of convection along the radiators. From a certain specific heating output, this is sufficient Convection does not prevent the formation of vapor bubbles on the surface of the radiator. The formation of vapor bubbles results in boiling noises and reduced heat transfer.

The object of the invention is to prevent the formation of vapor bubbles on the radiator by increasing the flow rate to reduce the amount of water to be heated on the radiator surface.

According to the invention, the above object is achieved in that the inflow pipe is parallel to the longitudinal axis of the Extends the container and has a plurality of radial bores along its height and that the tubular heater is parallel runs to the inflow pipe in the container. The kinetic energy of the water is used for the flow. Together with the convection, a helical, upwardly directed water current is created. the end the radiator is essentially countersunk:

flowed right towards its surface. This sets the vapor lock down, which comparable boiling noises \

are reduced and the heat dissipation is improved.

- 3 - I.

t t · ·

In a preferred embodiment of the invention that is Inflow pipe arranged close to the container wall. The bores are preferably tangential to the container circumference directed.

Another advantage of the invention is that precipitating scale and lime vcm the radiator is rinsed off. Lime and scale collect on the bottom of the container.

Further advantageous embodiments of the invention result from the following description of the drawings. In the drawing show:

Figure 1 shows a water heater schematically and

Figure 2 is a view of the water heater along the Line II-II according to Figure 1.

A flow heater has a cylindrical container with a longitudinal axis 2. A cold water inflow pipe 3 runs parallel to the longitudinal axis. This lies eccentrically to the longitudinal axis 2 close to the wall of the container 1. The inflow pipe 3 has bores h distributed over its length, which are directed tangentially to the container 1.

The inlet pipe 3 carries a pipe flange approximately in the middle. This Fohrflansch is led to the outside through a lateral opening in the container wall and is fixed there by means of a screw connection to the container wall. In addition to securing the inlet pipe, the screw connection also serves as the cold water supply line. The ends of the inlet pipe are closed, so that the cold water flows into the container through the holes 4 alone.

■ - 4 -

ι ι I ι ·

-A-

In the container 1 are hairpin-shaped electrical Tubular heater 5 arranged. The main extent of these runs parallel to the inflow pipe 3 · They are located also eccentric to the longitudinal axis 2. At the top of the container 1, a hot water outlet connection 6 is connected.

How the water heater described works is something like this:

Cold water enters the container 1 through the bores k at high speed. A rotational flow is created in this. As a result of the convection caused by the hot radiators 5, a vertical flow component is superimposed on the rotational flow, so that overall a helical f, water flow S is created. Be by the current

_; the tubular heating elements 5 perpendicular to their surface

yy flows. This results in intensive heat dissipation.

jf The tubular heating elements 5

η also flows with cold water at the top, so that also in the upper

■ | No overheating occurs in the areas of the tubular heating element.

P Due to the flow-intensive purging of the tubular heating

body, the tendency to form vapor bubbles is reduced

and improves heat transfer. Limescale or scale deposits are rinsed off at the same time.

The bores k can be shaped like a nozzle. You can have different diameters in such a way that the cross sections of the upper holes are smaller than the lower holes.

Claims (1)

Claims 15.4.82 1.1 Electric instantaneous water heater with cylindrical Water tank, an inlet pipe for the water to be heated and a helical water flow in the Container, characterized in that the Einstrumrohr (3) extends parallel to the longitudinal axis (2) of the container (1) and along its height a plurality of radial Has bores (4) and that the tubular heating element (5) runs parallel to the inlet roller (3) in the container (1). 2. Flow heater according to claim 1, characterized in that the inflow pipe (3) close to the pipe wall runs and the tubular heater (5) is arranged eccentrically to the longitudinal axis (2). 3. Water heater according to claim 1 or 2, characterized characterized in that the bores (h) are directed tangentially to the container circumference. k. Instantaneous water heater according to one of the preceding Claims, characterized in that several, hairpin-shaped curved tubular heating elements (5) are provided and that the bores (k) extend up to the level of the hairpin-shaped bend. 5. Water heater according to claim 1 and 2, characterized in that that the inflow pipe (3) is provided approximately in the middle with a pipe flange, with the help of which the inflow pipe laterally through the The container wall of the container (1) is guided and fastened by means of a screw connection. 6. Flow heater according to claim 5, characterized in that the ends of the inflow pipe (3) closed by means of pinching are.