Heating installation with closed liquid circuit

Stoves and furnaces – Liquid heater – Open-top vessel that may include lid

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Details

126344, 237 7, 237 66, A47J 2700

Patent

active

059642157

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a heating installation of the type which operates with a closed liquid circuit which is under pressure during operation. Incorporated on the one hand in the liquid circuit is a heating boiler in which heat is supplied to the liquid circulating in the circuit. Incorporated on the other hand in the liquid circuit are radiators and/or convectors by means of which heat is generated from the liquid to spaces for heating. Instead of or in addition to convectors and radiators an air transporting system can be used.
Installations of this type comprise a liquid reservoir in which is accomodated the extra volume of liquid resulting from expansion caused by heating of the liquid. When the liquid in the liquid circuit cools, liquid is carried from the reservoir back into the circuit again to compensate the volume decrease due to this cooling.
A heating installation of this type is described in the international patent application PCT/NL95/00034. In the heating installation described in this application the liquid reservoir is pressureless and liquid can be carried out of the reservoir into the pressurized system by means of a pump.
The present application relates to a further developed embodiment of the heating installation known from the stated international patent application.
FIG. 1 shows schematically a preferred embodiment of the installation according to the invention.
FIGS. 2-4 show three operational states of the installation of FIG. 1.
Of the heating installation 1 as depicted schematically in FIG. 1 only that part is shown which relates to the feeding and draining of the central heating liquid, normally water.
The heating water circuit is connected at 2 and 3. For purposes of the description of the system shown in FIG. 1 the connection 2 is deemed the inlet of this system and connection 3 the outlet.
Accommodated between inlet 2 and outlet 3 is a pump 4 which serves during normal operation to keep the heating water in circulation but which moreover serves as replenishing pump in a manner to be further described.
In the pipe between inlet 2 and outlet 3 a valve system 5 is arranged on the inlet side of pump 4. In the embodiment shown this valve system 5 comprises a feed/drain valve 6 which is connected via a rod 8 to a blocking valve 7 which is loaded in downward sense by a spring 9. The spring 9 rests against a screw cap 10. By rotating screw cap 10 the tension of spring 9 can be adjusted and therewith the force with which the system formed from the valve piston 7, rod 8 and valve piston 6 is pressed downward.
The pressure of the heating water in the inlet 2 acts counter to the force of this spring 9. This pressure acts via the channel 11 on the bottom surface of the piston of valve 6.
In the normal operating situation shown in FIG. 1 the force of spring 9 is in balance with the force exerted by the liquid such that an inlet port 12 and an outlet port 13 of the piston of valve 6 forms an open connection in the inlet pipe 2 to the pump 4.
FIG. 2 shows the situation when the pressure in the circuit rises too high and excess heating water must therefore be drained in order to return the pressure to the normal operating value.
When the pressure increases the piston 6 will be pressed upward counter to the force of spring 9 until a drain port 14 comes to lie opposite a channel 15 to a reservoir 20. The excess liquid can flow into the reservoir 20 via this drain port 14 and channel 15. As soon as the pressure has fallen sufficiently, the piston of valve 6 will then be moved so far downward again that the drain port 14 is closed. This then provides readjustment to the situation shown in FIG. 1.
Thus collected in reservoir 20 is a quantity of liquid 21 which is under a markedly lower pressure, i.e. under atmospheric pressure.
If gases are dissolved in the heating water drained to reservoir 20 these will, as a result or the lower pressure in reservoir 20, rapidly be released from solution and escape into the tank 20. The supply of liquid 21 is covered in reservoir 20 with a float 22 which seal

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