DE1573546A1 - Pressure measuring device - Google Patents

Description

/ ό D H O

SOCIETY FOR Karlsruhe, December 27, 1966

NUCLEAR RESEARCH MBH PTA 66/62 Gb / hl.

Pressure gauge

The invention relates to a pressure measuring device for measuring the differential pressure two media, especially hot and aggressive liquids such as liquid metals or molten salt, with two symmetrically attached to a straight housing and each closed by a pressure plate, exposed to the media Spring bellows, the pressure plates being connected to one another by a rod, their adjustment as a result of a pressure difference of the two media is displayed by an assigned measuring device.

A device of this type is known (DBGM 1 889 608). An exact display assumes here that the temperature of the media does not change significantly during the measurement.

009830 / 0A54

In order to mitigate the influence of temperature fluctuations, it continues to be known to switch two spring bellows, which are connected to a common pressure plate, against each other, the one bellows exposed to a hot medium, e.g. liquid metal, on both sides is, while the second bellows also serves as a partition between the hot medium and a cooling gas, with the pressure of which the pressure of the hot medium is compared (DBP 1 2o2 027).

The invention has for its object to provide a pressure gauge for measuring the differential pressure of particularly very hot liedien, at which practically eliminates the influence of temperature on the display.

To solve this problem, the invention proposes a the temperature of both measuring parts at the same level maintaining heat transfer device to be provided. As measuring parts Pederbälge or Membranes can be used with good success.

Since the bellows are switched against each other, the Influences of temperature changes both on the spring characteristics and on the advertising transmission devices are fully compensated .

An embodiment of the invention is explained in more detail with reference to the drawing:

The figure shows schematically in longitudinal section a differential pressure measuring device with two bellows 1, 2, which are attached to the housing 3 and closed at one end by a pressure plate 4 and 5, respectively are. The pressure plates 4, 5 are connected to one another by a rod 6. Tn the center of the rod 6 engages perpendicular to its longitudinal axis a spiral spring 7 clamped on the housing 3, the bending moment of which, together with the restoring forces of the bellows 1.2, acts on the pressure plates 4.5 acting differential pressure 'of the media keeps the equilibrium, with the size of this bending moment as a measured variable is used. For this purpose, a temperature-compensated spring 7 is

009830/0454

BATH ORIGINAL

Sized strain gauges 8 attached, the leads 9 gas-tight are led out of the housing 3 and connected to a display device (not shown). This strain gauge can can be exposed to very high temperatures without impairing its display accuracy, so that the otherwise necessary cooling devices superfluous. In addition, a very compact design of the "* Gera" is thereby also calibrated.

Fl e media to be measured, e.g. liquid sodium or sodium-potassium, two feed lines 11, 12 are provided which each lead into a pressure chamber 13 and 14, respectively. These pressure spaces are used by the genu insamen housing 3 and the outer sides of the bellows 1,2 and the Printing plates 4.5 limited. The inner space 15 enclosed by the spring bellows and the pressure plates with the rod 6, the spring 7 and the measuring strip 8 is hermetically sealed from the outside, so that no sodium is released from the outside even if a bellows breaks can penetrate. Emptying or pressure equalization lines 16, 17, 18 with corresponding valves are also connected to the pressure chambers 13, 14, so that the device can also be recalibrated during operation can be.

The two pressure spaces 13, 14 are of a common extension space 19 enclosed, which via the inlet and outlet lines 20,21 of a heat transfer medium, e.g. also liquid sodium or sodium-potassium is flushed through. By the heat flow from this annulus Any temperature differences between the two media in the Pressure chambers, and thus also the temperature differences between the Spring bellows 1,2 or the pressure plates 4,5 largely eliminated and can therefore no longer falsify the measurement display.

009830/0454 ,,,. BAPQRpNAl

Claims (3)

Karlsruhe, the 27th AP. '1 ΡΪΛ 62/66 GbAl Patent claims; 1. Pressure measuring device for measuring the differential pressure of two media, in particular of hot and aggressive liquids such as liquid metals or molten salt, with two measuring devices that are symmetrically attached to a common housing and each closed by a pressure plate and exposed to the media Rod are connected to each other, the adjustment of which is indicated by an associated measuring device as a result of a pressure difference between the two media, characterized by a _{heat transfer device that maintains the temperature of both measuring parts 1} (1, 7) at the same level. 2. Druckmesücjcrät according to claim 1, characterized in that both Messtei.Te (1,2) with their outer sides in each case one is acted upon by the media pressure chamber (13 _t 14) protrude, and that both pressure chambers (13, 14) from a common Annular space (19) enclosed sine, through which a heat transfer medium flows. 3. Pressure measuring device according to claim 1, with one in the middle of the connection £ <rod (6) engaging, on housing (3) clamped Spiral spring (7), characterized in that on the spiral spring ("") E.g. a strain gauge (0) is attached to measure the deflection the spiral spring ("/) registered and in the form of an electrical variable via connecting lines (9) on a display device as Measure for the pressure difference between the two media. 009830/0454 BATH