DE2443227A1 - Leakage detecting pressure responsive disconnecting switch - uses pressure equalising in case of metal bellows leakage actuating switch-off - Google Patents

Abstract

The pressure dependent switch for minimum pressure monitoring is intended for a disconnecting function when a leakage in a pressurised metal bellows takes place. A housing (3), sealed by a packing (4) against the compression spring (2) and against the electric contact assembly (6, 7). This pressure-right housing provides a pressure equalisation when the pressurised metal bellows (5) springs a leak. This pressure equalisation results in the compression spring force exceeding the counter pressure of the metal bellows, which results in actuating an isolating function of the alternating switching contact (7). This arrangement safeguards the operation of delicate measuring mechanisms.

Description

Subject: Pressure-dependent switch for minimal pressure monitoring, with the property, if the pressurized metal bellows leak to carry out a shutdown function. The invention relates to a pressure-dependent switch for minimal pressure monitoring, with the property, a shutdown function if the pressurized metal bellows leaks to execute.

So far, devices have been used for the monitoring tasks mentioned, if the metal bellows becomes defective for the minimum assigned to them Limit value monitoring were no longer suitable.

From a safety point of view, this meant that the system to be monitored creates a dangerous operating state, which led to great material damage. In addition, it was usually equipment damage only determined when the result of the leaking of the metal bellows Moisture penetrating the lifeline is those under electrical voltage Parts reached and through the gradually forming end-of-life the electrical Control of the system to be monitored switched off.

This process also led to the destruction of the measuring mechanism and the electrical ones Switching device.

These points of danger are identified by the invention Eliminates the pressure-dependent switch in the event of breakage or leaks in the metal bellows performs a shutdown function.

An exemplary embodiment is shown schematically in the drawing.

According to FIG. 1, the limit value is set by means of the adjusting screw 1. As a result, a pressure is achieved by the compression spring 2, which is the set Limit value corresponds.

This pressure acts on the metal folded plate 5 via the linkage 8.

The novelty of the invention and is that this bellows 5 of a pressure-resistant housing 3 is enclosed, which serves to prevent a leak of the bellows 5 to create a pressure equalization, so that thereby on the metal bellows 5 acting force of the compression spring 2 is stronger than the counter pressure of the bellows 5.

when the minimum pressure is exceeded, drive 5 moves upwards is actuated and thereby the changeover switch contact 7 switches to the switch-on position, In the case of the aforementioned defect, the changeover switch contact 7 now performs a shutdown function through and switches back to the starting position shown in the drawing.

The part 4 of the drawing of Fig. 1 represents the seal of the pressure-resistant Housing 3.

In Fig. 2 this part is shown enlarged and shows the seal 4a, which can be made with a heat-resistant Teflon seal, for example.

Claims (1)

P a t e n t a n s p r u c h (1) Pressure-dependent switch for minimum pressure monitoring, d a d u r c h e k e n n n z e i c h n e t that through the pressure-resistant and the compression spring 2 and to the electrical contact device 6 and 7 through the seal 4a, Fig. 2, sealed housing 3 when the pressurized metal bellows leak 5 a pressure equalization takes place, whereby the spring force of the compression spring 2 the counter pressure of the metal bellows and thus a shutdown function of the changeover switch contact 7 causes. L e r s e i t e