Measuring and testing – Fluid pressure gauge – Bourdon
Reexamination Certificate
1999-12-14
2001-11-13
Oen, William (Department: 2855)
Measuring and testing
Fluid pressure gauge
Bourdon
C073S732000
Reexamination Certificate
active
06314816
ABSTRACT:
The invention concerns a measurement system for a pressure measurement device.
In the known measurement system and the known pressure measurement device, the spring support is designed in one piece. The connection part of the spring support is usually designed as a threaded pin with an outside thread, whereby it is, however, also possible to design the connection part as a threaded sleeve with an inside thread. When the measurement system is incorporated into the housing of the pressure measurement device, the connection part is on the outside of the housing and it forms the device connection of the connection arrangement for connection of the pressure measurement device to a system carrying a fluid substance to be measured. The device connection may be screwed into a threaded bore or onto a threaded pin provided with an outside thread of the system carrying the measurement substance. The connection arrangement has a pressure channel by means of which the measurement pressure is forwarded to the Bourdon tube of the measurement system. In the known pressure measurement device, this connection arrangement, to which the device connection and the pressure channel belong, is integrated into the Bourdon tube and pointer shaft support.
The known pressure measurement device is provided either with a so-called radial fluid connector or with a so-called rear connection. In the case of rear connection, the fluid connector is located on the back wall of the housing of the pressure measurement device, whereby it, when designed as a threaded pin, protrudes from the back wall of the housing. In the case of radial connection, the fluid connector is located on the side wall of the housing, whereby it, when designed as a threaded pin, protrudes from the side wall of the housing. Since, in the known measurement system, the connection arrangement is integrated into the support and its connection part forms the device connection, the connection part for a pressure measurement device with radial connection must be arranged on the support, i.e., must extend in the radial direction relative to the pointer shaft, whereas for a pressure measurement device with rear connection, the fluid connector must extend toward the rear in the axial direction of the pointer shaft. This means that a fully assembled measurement system is suitable only for a pressure measurement device with radial connection or for a pressure measurement device with rear connection.
This creates the problem for the manufacturer of pressure measurement devices that he must keep in inventory both measurement systems with a radial connection part and measurement systems with a rear connection part for each measurement range if he wants to be capable of quickly delivering otherwise identical pressure measurement devices according to customer demand either with radial connection or with rear connection. It is possible to partially avoid this high production and storage expenditure in that units comprising only the support and the Bourdon tube both with a radial connection part and with a rear connection part are produced and kept in stock and that the assembly of these units with the pointer mechanism into the measurement system does not occur until it is specified, based on a customer order, whether the pressure measurement devices to be delivered are to have radial or rear connection. However, with this procedure, quick delivery of the pressure measurement devices is not possible since the usually necessary and time-consuming adjustment of the measurement system can be performed only on the fully assembled measurement system or during assembly of the measurement system at the earliest.
The publication FR-A1-25 32 423 discloses a pressure measurement device which claims to solve the above-described problem. In this prior art pressure measurement device, a rear threaded hole and a radial threaded hole, both of which are connected with the pressure channel designed in the spring support, are designed in the spring support. As needed, a device connector produced as a separate part is screwed either into the rear or into the radial threaded bore, and the other threaded bore is sealed in each case by a screw plug. This solution has the disadvantage that the production of the spring support is comparatively complex and that it is necessary to seal the pressure channel reliably against the outside at two locations, i.e., both at the radial threaded bore and at the rear threaded bore.
The publication DE-C2-19 530 024 discloses a pressure measurement device whereby the device connection is designed as an insertion pin arranged on the rear.
The object of the invention is to improve the generic pressure measurement system such that the type and the site of the device connection of a pressure measurement device into which the measurement system can be incorporated is not already predetermined by the design of the measurement system. In particular, the measurement system to be created should be suitable both for a pressure measurement device with radial connection and for a pressure measurement device with rear connection. Moreover, the measurement system to be created should be as compact as possible and have no greater space requirement than the generic measurement system.
A further object of the invention is to improve the generic pressure measurement system such that the site and type of its device connection may be freely selected without this requiring a different measurement system depending on the type and site of the device connection.
A measurement system wherein the connection part is designed as a plug-in component, belongs to the prior art on the basis of the older, but unpublished European Patent Application No. 98 113 938.9. However, in this measurement system belonging to the prior art, the plug-in component is not arranged radially near the pointer shaft.
The measurement system according to invention is connected directly or indirectly with the system carrying the substance to be measured, whose pressure is to be measured, in that the plug-in component of the measurement system is plugged in along with a second plug-in component shaped to complement the plug-in component of measurement system. The second plug-in component may, for example, be part of a connection arrangement of a pressure measurement device provided with a device connection, whereby the plug-in connector of the measurement system does not then also form the device connection. The type and the site of the device connection on the pressure measurement device are thus not predetermined by the measurement system. Instead, the measurement system according to the invention is suitable both for a pressure measurement device with radial connection and for a pressure measurement device with rear connection. The same measurement system can, consequently, be used both for the production of a pressure measurement device with radial connection and for the production of a pressure measurement device with rear connection. In order to be able to quickly deliver a specific number of pressure measurement devices which have, per customer demand, either radial connection or rear connection, it suffices to produce fully assembled and adjusted measurement systems for the measurement range in this number and to keep them in inventory. Only the connection arrangements with radial device connection and the connection arrangements with rear device connection have to be kept in stock in each case in the specific number. The final assembly of the pressure measurement devices can take place in a short time since the time-consuming adjustment of the measurement systems can already be performed before assembly thereof with the connection arrangement.
Because of the fact that, in the measurement system according to the invention, the plug-in component is placed behind a plane including the back of the upper plate and radially near the pointer shaft, it is located inside a space which must be provided anyway for the pointer mechanism, the Bourdon tube, and the Bourdon tube mount of the support, such
Aw-Musse Abdullahi
Oen William
Roth & Goldman
Wika Alexander Wiegand GmbH & Co.
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