DE1475718A1 - Leak detection device for double-walled heating oil tanks - Google Patents

Description

ο * · »., U75718

Patent attorneys .! .- (named Walter Meissner Dipi.-ing. Herbert Tischer

1 BERLIN 33, Herbertstrasse 22 MUNICH

Telephone: 8 87 72 37 - Wire word: Invention Berlin Postocheckkonto: W. Meissner, Berlin West 12282 Bank account: W. Meissner, Berliner Bank A.-GL, Depka 36, Berlln-Halensee, KurfOrstendamm 130 Account No. 96 716 1 BERLIN 33 (GRUNEWALD), May 12th, 1966 *

Herbertstrasse 22 Ρτ / Ut

1850

Hansen, Neuerburg ft Go. GmbH, 43 Esse n / Ruhr, Rütten-

Scheider Str. 1

"Leak detection device for double-walled heating oil tanks ¹¹

The invention relates to a leak detection device for double-walled liquid containers, in particular heating oil tanks, which is provided with a pump generating a negative pressure in the jacket space formed by the double wall and with a pressure-dependent switch for an alarm device. Such a device, described in the earlier patent application H 56 435 XU / 47 f (Auslegeschrift 1 258 678), provides to let the connection pipe of the pressure-dependent switch open into the dumbbell space separately from the suction pipe of the pump and that To lead the suction pipe in the jacket space up to its sole, so that its suction opening is already closed by a small amount of leakage fluid and the further negative pressure generation in the jacket space is interrupted by the pump.

The invention provides another solution to the same task, namely to trigger the alarm when the leakage fluid rises from a height of a few cm and to manage with a weak negative pressure in the jacket space, namely the connection

- 2 - 909844/0489

H75718

pipe of the pressure-dependent switch separated from the suction pipe to let the pump open into the shell space and in the dumbbell space with a tube up to its sole to lead.

The two connections are a hit with the proposal according to the invention of the dumbbell room can also be confused if only one of the two connections is up to the sole area is continued. The alarm is then given a little later than with the device proposed in the earlier application, i.e. only a few cm higher level of leakage fluid, but the difference in sensitivity is practically insignificant

In the drawing, the invention is explained using an exemplary embodiment. It shows schematically in cross section a heating oil tank, the wall of which is leaking, and the leak detection device.

Sin of an inner wall 1, an outer wall 2 and one Born 3's existing underground heating oil tank has between walls 1 and 2 what is needed to prevent leaks known shell room 4. The dumbbell room is drawn in an exaggerated manner. In reality it is so small that the Outside wall touches the inside wall in places. In the apex area, the tank is in a known manner with a connecting piece 5 and 6 provided. A tube runs from the nozzle 5 7, which is expediently inserted during the manufacture of the tank, up to the floor area of the dumbbell room. At the nozzle 5 is a pressure switch 11 and the suction pipe 9 of a pump 10 is connected to the nozzle 6. From the suction line 9, which ends in a short tube 8 in the connecting piece 6, branches off a connecting piece 13 to which a further pressure switch 14 is connected is. * v-,,

909844/0489

H75718

The symbol of the pump 10 represents a diaphragm pump with AC magnetic drive. The symbols 11 and 14 include the connection to the AC mains a. The connection 18 is therefore the electrical connection the pump to the pressure switch 14.

The pump 10 stops via the control circuit 9, 13, 14, 17, 10 a negative pressure in the range of 70 to 30 cm WS is maintained in the dumbbell room 4. The pump output is controlled by a not shown throttle — place so small that

ρ a leak of, for example, only about 0.7 mm in size is sufficient to allow the negative pressure to drop below 30 cm water column while the pump is running. At about 20 cm water column, the pressure switch 11 responds and switches the alarm device 15 on. If the mentioned leak is below the groundwater level or below the level of the tank contents, the liquid entering the exaggeratedly large dumbbell space 4 collects as a sump. The rising leakage liquid closes the tube 7, which is led down to the bottom area , and causes the pressure switch 11 to start up , thereby activating the alarm device 15 .

If the suction pipe of the pump is extended through the tube 7 to the bottom area of the shell space by swapping the connections on the two nozzles 5 and 6, the further vacuum maintenance of the dumbbell space is increased when the leakage fluid rises due to the increase in water pressure in the suction pipe to a maximum of 70 cm Leakage interrupted. The pressure switch 1t then sets the alarm device 15 in operation.

- 4 - - Patent claim -

909844/0483

Claims (1)

U75718 -A- Claim Leak detection device for double-walled liquid containers, in particular heating oil tanks, with a negative pressure in the jacket space formed by the double wall generating pump and with a pressure-dependent switch for an alarm device, characterized in that that the connecting pipe (17) of the pressure-dependent switch (11) separated from the suction pipe (9) of the pump (10) in the Dumbbell space (4) opens and is guided with a tube (7) in the shell space up to its sole such that the opening of the tube with a small amount of leakage fluid (16) is closed and the pressure switch (11) when the leakage fluid increases slightly appeals to. Pia 909844/0489