Fluid handling – Line condition change responsive valves – Safety cut-off requiring reset
Patent
1987-09-10
1989-11-28
Bennet, Henry A.
Fluid handling
Line condition change responsive valves
Safety cut-off requiring reset
73 405R, F16K 1700
Patent
active
048830879
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a central heating system or a similar closed heating system with inlet and outlet for a heat carrying medium, and a method for controlling the tightnes of the system.
Central heating systems of this type are usually operated with water as the heat carrying medium. The water is either heated in a local heating plant or in a district heating plant.
In such installations the heat carrying medium is common to the whole system, and such systems are called directly connected systems.
By such directly connected systems there will be a risk of large amounts of water flowing out, eg. if a radiator or a pipe bursts resulting in damage to the building. This is due to the considerable quantity of water contained in a system of this type.
If the water flow is not immediately shut off in that part of the system where the leak is, such damage will be very comprehensive since the water will at worst not be shut off until damage has been done, e.g. if there are no persons present.
It is the object of the invention to overcome this disadvange by these directly connected systems, and this is achieved by a system where a volume flow meter with an electric output signal is inserted at the inflow and return flow of the medium, and a motor valve for shutting off the flow through the flow meter and a non-return valve for shutting off the return flow after the return flow meter.
This enables a continuous control by supervising the flowing and returning amount of water, respectively, thus controlling the tightness of the system, because any difference between the inflowing amount and the returning amount indicates a loss of fluid stemming from a leakage. Hereby such a leakage can be detected far away from the installation, and the water flow can be shut off at once, e.g. by actuating the motor valve, which can be electrically driven. At the same time the non-return valve will ensure that no water is led to the system through the return pipe which makes it possible effectively to prevent that no more water escapes than can be helped.
This makes it possible at a very early stage of the leakage to take action and thus prevent any damage to the installation and the building.
By, having a control unit automatically monitor the volume flow meters and signal to the motor valve and maybe an alarm, in case the existence of a leakage has been established, an automatic shutting off of the flawed section of the plant is achieved.
By means, where the signal from the meter is compared with a pre-determined rate of water flow, the supply of water can be shut off effectively, whereby damage to the building or installations dependent on water, animals, plants, etc. can be avoided altogether.
By, making the comparison within a certain time interval, even the smallest leak will be detected, if it is controlled at a time where no water consumption takes place. This will rule out the tremendous waste of water caused by small leaks, water taps that are not turned off, leaky ball cocks, etc.
In the following the invention will be described in closer detail with reference to the drawing, in which
FIG. 1 shows a pipe diagram of a district heating installation,
FIG. 2 shows a block diagram of the control unit, and
FIG. 3 shows a pipe diagram of a single-pipe water installation.
In FIG. 1 is shown an example of an embodiment of a system comprising a district heating supply system 1, 2 and a central heating installation comprising radiators 11 with communication pipes 10 in a generally known manner.
The district heating installation comprises a flow pipe 1 and a return pipe 2. Mounted to this installation are the connecting pipes 3 and 4 of the central heating system.
At the place 5 where the system is used, as indicated by a dotted line, an electrically driven motor valve 6 is mounted on the flow connecting pipe 3, which valve, when the motor is actuated, will limit the flow of hot water from the district heating pipe 1.
After the motor valve 6 a volume flow meter 8 with electric output signal is mounted, a so-called flow meter.
In t
REFERENCES:
patent: 3695094 (1972-10-01), Hulme
patent: 4066095 (1978-01-01), Massa
Bennet Henry A.
I.K. Trading Aps.
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