DE8632526U1 - Pressure gauges - connection - Google Patents

Description

ALEXANDER WIEGAND GMBH & CO. Valve and pressure gauge factory 8763 Klingenberg am Main

Pressure gauge connection

The invention relates to a pressure measuring device connection both for manometers and for electrical pressure sensors for high-pressure, ultra-vacuum, high and low-temperature technology. This application requires a purely metallic connection that can be detached as often as possible and that is chemically neutral towards the medium flowing through it. Such requirements are made, for example, by the semiconductor industry, medical technology and the food and beverage industry.

■ Up to now, pressure connections with external thread connection pieces,

;: flat sealing surface and flat gaskets or a quick connection

connection with sealing head and O-ring, as in the German

| Utility model 81 22 006 was disclosed, or a pipe connection piece with sealing flange and union nut for welding to the correspondingly shorter measuring element carrier.

The external thread connection pieces do not allow the measuring device to be aligned without a noticeable reduction in the sealing effect. The cutting _- edge connection can only be used conditionally by the

> Material manufactured O-ring and welding of a pipe connection

'■ Nozzle with sealing flange is complex and one possible leak and

W Contamination site.

It is therefore the object of the invention to develop a reliable and cost-effective pressure gauge connection for the above-mentioned application.

This is achieved according to the invention in that the lower end of the measuring element carrier in the pressure gauge or the pressure sensor lower part in the electrical pressure sensor is designed as a pipe socket with an annular flange at its end with an axial sealing bead on the connection side and a union nut enclosing the annular flange.

Preferably, the union nut has a stepped cylindrical deformation section that is 1/4 of its total length with a through hole that is 1.05 times larger than the diameter of the ring flange, which is reshaped by a pressure tool after the union nut has been slipped over the ring flange in such a way that the original through hole only corresponds to the size of 1.05 times the outside diameter of the pipe socket and as a result the union nut encloses the ring flange with its newly formed shoulder section.

In a further advantageous embodiment of the invention, the axial sealing bead on the connection side of the ring flange has a semicircular, semi-elliptical or concave-curved cross-section with a plane-parallel pressure surface.

The pressure gauge connection according to the invention is a new

technical unit from the previously independently existing

Measuring element carrier and pipe connection piece for welding with sealing flange

and union nut.

This is achieved by the special type of union nut according to the invention

and enables their processing.

This results in an extremely temperature-resistant, absolutely dense, chemically

clean and easily manufactured connection.

An embodiment of the invention is shown in the drawing and is described in more detail below.

Show it

Fig. 1 the front view of a Bourdon tube pressure gauge with a

inventive connection

Fig. 2 the new connection in the position before assembly

the union nut and in the position after assembly of the union nut

Fig. 3 the different embodiments of the axial sealing bead

on the connection side of the ring flange of the connection according to the invention

From Fig. 1 it can be seen that a cylindrical pipe socket 3 with a ring flange 4 located at the lower end is screwed onto the lower end of the measuring element carrier 1 with the pressure channel bore 2. The union nut 5 is held by its shoulder section 6 ε,�eegr;�eegr; ring flange.

Fig. 2 shows the union nut 5 before and after assembly . The through hole 7 in the stepped deformation section 8 is larger than the largest diameter of the ring flange 4 before assembly (item 1), so that the union nut 5 can be easily pushed backwards over the ring flange 4. By pressing the deformation section 8 with a suitable tool, the through hole 7 is reduced to 1.05 times the size of the outside diameter of the pipe socket 3, so that the union nut 5 with its newly formed shoulder section 9, see item 2, encloses the ring flange 4.

The axial sealing bead 10 on the connection side ( 11 ) of the ring flange can have a semicircular ( 12 ), semi-elliptical ( 13 ) or concavely curved cross-section with a plane-parallel pressure surface ( 14 ) as shown in Fig. 3.

Claims (3)

PROTECTION CLAIMS 1. Pressure measuring device connection for both manometers and electrical pressure sensors for high pressure, ultra-vacuum, high and low temperature, characterized in that the lower end of the measuring element carrier (1) for the manometer or the pressure sensor lower part for the electrical pressure sensor is designed as a pipe socket (3) with an annular flange (4) at its end with an axial sealing bead (10) on the connection side and a union nut (S) enclosing the annular flange (4). 2. Pressure gauge connection according to claim 1, characterized in that the union nut (5) has a stepped cylindrical deformation section (8) that is 1/4 of its total length and has a through hole (7) that is 1.05 times larger than the diameter of the ring flange (4), which is reshaped by a pressing tool after the union nut (5) has been slipped over the ring flange (4) in such a way that the original through hole (7) only corresponds to the size of 1.05 times the outside diameter of the pipe socket (3) and the union nut (5) thus encloses the ring flange (4) with its newly formed shoulder section (9). 3. Pressure gauge connection according to claim 1 and 2, characterized in that the axial sealing bead (10) on the connection side (11) of the ring flange (4) has a semicircular (12), semi-elliptical (13) or concavely curved cross-section provided with a plane-parallel pressure surface (14).