DE489483C - Expansion vessel for water heating systems - Google Patents

Description

Expansion vessel for water heating systems The production of hot water for the household by means of a central heating system usually takes place in one Container connected to the water pipe through an antechamber with a float valve is, has a tap with tap and contains a heating coil inside, which is switched into the circulation line of the central heating system.

It is also known, instead of arranging a heating coil in the container, to lay the expansion tank of the system around the outside of the water tank, which the Plant costs are reduced and operations are simplified. The well-known facilities but of this type have the disadvantage that the expansion vessel surrounding the container at different temperatures of the heating water filled to different heights is because the water level in the expansion tank rises with the water temperature and falls. If the heating water temperature is relatively low, the heating surface of the Container therefore small, large at high temperatures. In the former case one obtains therefore only a little hot water if the device is not very large executes.

According to the invention, this disadvantage is overcome by such a construction of the expansion vessel avoided that the water level in this vessel is normal Dimensions of the device hardly changes when the temperature of the circulating water increases or decreases. For this purpose, the expansion vessel can be connected to a float valve are connected to the tank, so that when the heating water temperature drops, the The expansion tank is refilled with hot water from the boiler. In order to avoid, that the same amount of water with a subsequent increase in the heating water temperature is lost through the overflow and again when the temperature drops later must be replaced by water from the container, you can according to the invention according to the Expansion vessel above the lowest water level determined by the float valve carry out so far that when the temperature increases due to elongation of the There is room for the excess of water in it. The water level then only changes in this expanded parts of the expansion tank, and the action of the float valve limited to the automatic replenishment of the circulating heating water volume, preferably from the container, but optionally from the water pipe. Finds Little or no evaporation of the water takes place, the float valve can then also be dispensed with.

The drawing illustrates two exemplary embodiments in vertical section the invention.

According to Fig. X, the water tank z is connected to the cold water supply line at z connected. A float 3 with valve q. ensures that the water level does not change in the container. The cold water is through a dip tube 5 below introduced into the container while the hot water through a pipe 6 the upper Parts of the container is removed. When you draw off the hot water the end the lower part of the container through the cold water from line 5 upwards pressed. The expansion vessel 7 is attached to the hot water tank i 8 is connected to the riser pipe, at g to the downpipe of the heating system.

The device described so far is essentially the same the known version. Only the latter has a second connection for that Riser pipe approximately at the same height as the discharge nozzle g with regard to the itself changing water level in the expansion vessel and consequently also in the riser.

According to the invention, the expansion vessel 7 is provided at the top with a chamber io in which there is a float ii which, by means of a valve 12, lets in water from the container i when the level in the expansion vessel falls below a certain level. The float chamber io is provided with an overflow 13 . Too high a water level in the container i is avoided in that a possible excess of water can escape from the container through an opening 1q into the float chamber io and from this through the overflow 13. If the temperature of the circulating water in the expansion vessel 7 falls, the float ii lets hot water flow over from the container i into the expansion vessel 7, so that the heating surface of the container remains unchanged. If the water temperature rises, the excess flows through the overflow 13. If it then sinks again, the float valve ii, i2 comes into effect again.

In the version according to Fig. 2, the drainage of hot water is at Rising water temperature avoided in that the float chamber io the device according to Fig. i has been replaced by an enlarged part 2o, the expansion water can absorb all or most of it. Since the wall of the expansion tank 7 under the expanded space 2o is at a short distance from that of the container r, the total volume of the expansion vessel is not larger than usual. Should at a very high temperature still drain water or z. B. by evaporation Water from the plant; lost, the swimmer ii ensures that this Water is replaced again when the temperature is subsequently lowered. Will the water level observed by means of a diameter and, if necessary, refilled the system by hand, the connection between the water tank and the expansion tank can be established by means of the Float valve can be dispensed with.

To refill the container i, the tube 15 is kept so narrow that the cold water can only enter slowly and has no time to mix with the hot water. Therefore, the tube = 6 is also made shorter than the corresponding tube 6 according to Fig. I.

Claims (1)

PATENT CLAIM: Expansion vessel for water heating systems, one thing Surrounds container for hot consumption water, characterized in that the expansion vessel (7) at the upper end contains a storage chamber (io) provided with an overflow (z3), by one in the partition between the expansion tank (7) and the water tank (i) located opening communicates with the hot water tank (i), the is lower than the overflow line (i3) from .. the storage chamber (io) and their closure is regulated by a float (ii) in the expansion tank (7) will.