DE2317118B2 - Pressureless hot water heater with overpressure protection - Google Patents

Description

35

The invention relates to a pressureless hot water heater with a container that has a filling pipe and a nozzle can be connected to a water network and an overflow pipe leading directly to a tap and a pressure relief valve.

In such devices, when the nozzle is opened cold water pressed through the filling pipe into the container and thereby at the same time located in the container Hot water through an overflow pipe from the container then displaces it unhindered to the open one Tap can flow. The overflow pipe is dimensioned so that the container is only slightly when the tap Pressure is exposed to what the dimensioning of this container is also based. so

Depending on the nature of the water, limescale can build up on the opening of the overflow pipe over time deposit, as a result of which the cross-section of the opening decreases or this opening becomes completely clogged; leading then to an inadmissibly high pressure load on the BehalicK and possibly to an explosion. In order to avoid this, one has with such pressureless hot water heaters already overpressure protection in the wall of the container, z. B. in the form of spring-loaded Valves or defined weak points, attached, which are then exceeded when a maximum permissible Open pressure (DT-Gbm 18 06 270; 73 306); but the then uncontrolled escaping disturbs Water.

The object of the invention is to prevent the water from escaping from the actual water system to be avoided in case of overpressure.

The inventive solution to this problem is at

a pressureless hot water heater of the type mentioned, characterized in that the pressure relief valve in a channel that opens into the overflow pipe

Various alternative embodiments of the invention are explained with reference to the figure which schematically shows a hot water heater with a container 1, a flange plate 11, a filling pipe 12, a heating element 13 and an overflow pipe 14 with an opening 141 shows This is a hot water storage tank suitable for over-sink operation, in which the cold water inlet takes place at the bottom and the opening 141 of the overflow pipe 14 in the upper region of the container 1 lies

A mixer tap 2 with a filling pipe connection 21, a tapping pipe connection, is used for drawing off cold water 22, a water supply connection 24 and a tap 23 are provided; between the water supply connection 24 and the guide pipe connection 21 connected to the filling pipe 12, a nozzle 26 is arranged, which is shown here in the open position. The dispenser Ie 23 communicates directly with the dispensing pipe connection 22, which is connected to the tap pipe 14 of the water heater. Finally there is a cold water valve 25 provided (drawn in the closed position), which is in a channel between the water network connection 24 and the tap 23 is located

When the nozzle 26 is in the illustrated, open Position is cold water from the water supply connection 24 via the filling tube 12 into the container 1 printed and thereby displaced hot water through the overflow pipe 14 to the tap 23; for temperature control cold water can be added to this water with the aid of the cold water valve 25.

Should the opening 141 now clog in the course of time, then there would be in the container 1 when it is opened of the nozzle 26 an impermissibly high pressure, in the borderline case of the water network, which leads to a Can cause the container to explode. To avoid this, a pressure relief valve 31 can be used, for example in the half of the overflow pipe 14 facing the container duct, as shown in the figure is shown schematically.

As an alternative to this, it is also possible to use a pressure relief valve 32 inside the flange claw 11 and in the course of an outside of the container 1 into the overflow pipe 14 opening channel 321 to be arranged.

Hot water devices that are suitable for above and below basin operation can also be equipped with a equip overpressure protection of the types described; one will either use a pressure relief valve 31 for this Arrange on the inlet and overflow pipe or a pressure relief valve 32 each in a channel 321.

A third alternative is to place the fill pipe 12 and overflow pipe 14 outside of the container to connect a channel 331 to one another and to arrange the pressure relief valve 33 in this channel; For this you will expediently form the channel 331 at one end T-shaped and laterally with one a cylinder 332 screwable cap 333 is provided, so that the actual pressure relief valve 33 can be easily replaced is. This version can be installed separately from the hot water heater and is then in the shown form suitable for above and below basin operation; however, provided the duct is inside the water heater is housed, universal installation of the water heater is only possible if the pressure relief valve sy timetrically forms such that

23 17 188

it regardless of the direction of the overpressure when a certain amount of overpressure is reached opens. For this purpose, in the simplest case, two spring-loaded pressure relief valves can be used in the figure arrange shown type antiparallel.

Finally, a particularly simple embodiment of the invention consists in the upper pressure valve 34 to be arranged within the mixer 2 so that it is connected to the FüUrohranschluss 21 between a Chamber and one communicating with the tap 23 Chamber is also here a screwable cap 341 is expediently arranged in such a way that that an exchange of the pressure relief valve 34 is possible

In each of the described embodiments of the invention, this flows when the pressure relief valve is opened water diverted from the pressure side through the tap 23, as indicated by dashed lines; that in Exiting water can therefore not be subjected to excess pressure

ίο cause more damage.

1 sheet of drawings

Claims (5)

23 17 claims: 1. Pressureless hot water heater with a container that is connected via a downpipe and a nozzle a water network can be connected and an overflow pipe leading directly to a tap and a <Has a pressure relief valve, characterized that the overpressure valve (32, 33) is located in a channel (321,331) in the overflow pipe (14) opens 2. Pressureless hot water heater according to claim 1, characterized in that the pressure relief valve (31) in the half of the overflow pipe (14) facing the container passage within the Container (1) lies 3. Pressureless hot water heater according to claim 1, characterized in that the pressure relief valve (32) in the container wall, in particular in the flange (ti), and the associated channel (321) runs outside the container (1) and there opens into the overflow pipe (14). 4. Pressureless hot water heater according to claim 1, characterized in that the channel (331) with the pressure relief valve (33) located therein outside the container (1) between the filling pipe (12) and Overflow tube (14) is arranged. 5. Pressureless hot water heater according to claim 4, characterized in that the pressure relief valve (34) in a fitting containing the nozzle (26) (2) is accommodated between the filling pipe connection (21) and the tap (23).