DE3643952C2 - Device for controlling the proportionate supply of two differently heated process water flow rates - Google Patents

Description

The invention relates to a device for controlling the proportional Supply of two differently tempered process water flow rates according to the boiler Concept of claim 1.

From EP-OS 98 450 is a device according to the type just mentioned become known, in which two secondary heat exchangers are available at which, however, is not a mixture of two customs flowing out of the heat exchanger water flows takes place. The hot water flow does not go through after first secondary heat exchanger and another connected in series with it Secondary heat exchanger.

In the device known from DE-OS 28 14 886 two custom can water flows are mixed, but a temperature measurement is carried out for control purposes tion of the mixing valve in the mixing point, so the mixing is regulated temperature.

The object of the invention is to provide a device of the type specified in the introduction to create, which is characterized by a particularly economical energy recovery records and the setting of a temperature equilibrium Weight status between the individual units in a simple manner constantly takes place.

In order to achieve the object, the devices specified at the beginning are described in a device Art the characteristic features of claim 1 vorese hen.  

In this arrangement are the temperature capable of using the different temperatures to compare each other and through the mixing valve bring about a temperature compensation. Example a decrease in the temperature of the running water through the secondary heat exchanger Shift run priority to memory, namely especially at the beginning of a tap.

For the formation of the mixing valve are in the frame various possibilities open to the invention.

So this mixing valve can be a three way valve, whose rest position the release of the from memory Corresponding consumer leading tap line and its Position of the relationship between the temperatures of water in the reservoir and water in the further Secondary heat exchanger is dependent.

Such a mixing valve can also be a slide included, which is guided in a mixing chamber and so probably one leading from the store to the consumer also one from the secondary heat exchanger to the consumer leading management releases alternately in opposite directions or closes.

More details are given in the better ver consistency because of the drawings below explains the embodiments of the invention Represent establishment.  

Show in detail

Fig. 1 -versorgungsanlage the circuit diagram of a hot water heating and,

Fig. 2 shows a detail of this plant,

Fig. 3 shows a further detail,

Fig. 4 shows the circuit diagram of a variant.

Referring to FIG. 1, the system includes a primary heat exchanger 1 with a burner 2. A heating circuit with a pump, a flow 3 and a return 4 is connected to this primary heat exchanger 1 .

From the lead 3 , a branch line 5 leads to a hot water tank 6 containing a first secondary heat exchanger, which is supplied with water from a supply line 7 and delivers hot water to consumers via a tap line 8 .

The hot water coming from the heating circuit and used to heat the storage water is fed back via line 9 , in which there is a further secondary heat exchanger 10 , into the return 4 of the heating circuit. This further secondary heat exchanger 10 is provided via line 11 from supply line 7 and is connected via line 12 to a three-way valve designed mixing valve 13 , which is located in dispensing line 8 and is controlled by actuator 14 .

The actuator 14 receives its manipulated variable from two temperature sensors 15 and 16 , one ( 15 ) of which is influenced by the outlet temperature of the water coming from the reservoir 6 , the other ( 16 ) by the temperature of the water in the further secondary heat exchanger 10 .

The actuator 14 can, for example, as shown in FIG. 2, be a bellows with an overtravel spring.

In this embodiment, both temperature sensors 15 and 16 act on the same actuator 14 . The sensor 15 is - as shown in FIG. 3 - dimensioned much larger than the sensor 16 , so that it ( 15 ), which queries the temperature in the memory 6 , has priority when delivering the control value to the actuator 14 .

The function of this device is as follows:

The three-way valve 13 is open in its rest position between the reservoir 6 and the tap line 8 . If the storage water is warmer, the actuator 14 moves with a bellows, the valve 13 in the direction of passage from the further secondary heat exchanger 10 in dependence on the temperature determined there. By querying the temperatures in the secondary heat exchanger 10 and in the memory 6 , these temperatures are compared and the mixing valve 13 is adjusted in order to achieve a temperature equilibrium. The temperature can be adjusted by changing the sensor (bellows) in relation to valve 13 .

Such a facility can - such as shown - with two, but also with several tem temperature sensors work. Depending on the different  determined temperature values arises in each case a temperature equilibrium without further action.

Fig. 4 shows a modified embodiment of the mixing valve 13. This mixing valve 13 consists of a mixing chamber 17 into which the inflow line 19 from the further secondary heat exchanger 10 and the line 18 from the store 6 open in such a way that their mouths can be released or closed alternately by a common slide 20 .

This slide 20 is controlled by actuators 14 of the two sensors 15 and 16 and is under the action of overtravel springs 21 ; insofar as it closes one of the two lines 18 , 19 , it opens the other in opposite directions, so that water can escape from the chamber 17 via line 22 with a stable mixing temperature.

Claims (4)

1.Device for controlling the proportionate supply of two differently tempered process water flow rates, which are supplied to a consumer as a mixture, with a primary heat exchanger having a hot water heating and supply system which is connected to a heating circuit or to a process water heating circuit with a first secondary heat exchanger containing hot water tank is switchable, characterized in that another with the first secondary heat exchanger hydraulically in series secondary heat exchanger ( 10 ) and at least two heat sensors ( 15 , 16 ) are provided, one of which ( 15 ) from the Temperature of the domestic water in the domestic water tank ( 6 ), the other ( 16 ) is influenced by the temperature of the domestic water in the wide ren secondary heat exchanger ( 10 ), and that both Wärmefüh ler ( 15 , 16 ) connected to a mixing valve ( 13 ) are, the hot water pipes ( 8 or 12 ) from the hot water supply icher ( 6 ) and from the secondary secondary heat exchanger ( 10 ) to the consumer. 2. Device according to claim 1, characterized in that the mixing valve ( 13 ) is a three-way valve whose rest position corresponds to the release of the line leading from the domestic hot water tank ( 6 ) to the consumer ( 8 ) and whose position in each case from the ratio between the temperatures of the domestic water Storage ( 6 ) and the domestic water in the further secondary heat exchanger ( 10 ) is dependent ( Fig. 1, 2). 3. Device according to claim 1, characterized in that the mixing valve ( 13 ) contains a slide ( 20 ) which is guided in a mixing chamber ( 17 ) and both the line ( 18 ) leading to the consumer from the hot water tank ( 6 ) and the from the further secondary heat exchanger ( 10 ) to the consumer leading line ( 19 ) alternately in opposite directions releases or closes ( Fig. 4). 4. Device according to claim 3, characterized in that the heat sensors ( 15 , 16 ) have different sizes, the larger sensor ( 15 ) determining the throughput priority of the hot water supply to the mixing valve ( 13 ) ( Fig. 3).