Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
  • G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
  • G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
  • G01L7/04—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges in the form of flexible, deformable tubes, e.g. Bourdon gauges
  • G01L7/041—Construction or mounting of deformable tubes
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
  • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
  • G01L19/0007—Fluidic connecting means
  • G01L19/0038—Fluidic connecting means being part of the housing

Definitions

• the invention relates to Bourdon tube pressure gauge, which consist of a plastic housing with a connection channel located in it, and to which a separate, radially or axially arranged connection piece on the one hand and an elastic tube spring with adapter piece horrs ⁇ its are connected. It should be created a possibility, both radially and axially fixed with a
• the rotational position of Bourdon tube gauges is adjusted either by using a threaded fitting which is twisted in the seal with thread sealants, for example hemp thread or Teflon tape, or flange-ring nut connections are used. Furthermore adapter pieces are used, which allow the fixing of a previously set rotational position of the Bourdon tube pressure gauge in different connection technology. All these options usually require the use of tools in order to realize the rotation of the Bourdon tube pressure gauge without damage. In the former option, the sealing of the threaded connection takes place manually and with different results, so that either a critically high torque must be expended if you want to initiate the torque manually on the Bourdon tube pressure gauge housing, or that in the opposite case even at a slight twist the Tightness of the connection is impaired. In the other options, at least one additional component is required, which increases the material costs and assembly costs.
• thread sealants for example hemp thread or Teflon tape, or flange-ring nut connections are used.
• adapter pieces are used, which allow the fixing of a previously set rotational
• the object of the invention is therefore to find a solution for the rotation of Bourdon tube pressure gauges relative to their connection piece, which can overcome the said disadvantages of existing solutions.
• This object is achieved by the inventive solution according to claim 1.
• Exemplary embodiments and developments of the invention are presented by the claims 2 to 6.
• both axially and radially connected Bourdon tube pressure gauge, but also comparably designed hygrometer, thermometer or similar instruments can be conveniently and inexpensively brought in a firmly connected state in a stable maintained rotational position within the entire rotation angle spectrum. This offers considerable advantages in terms of readability, installation effort and the construction of various peripherals.
• the object is achieved by providing a radial or axial receiving location (7) on the plastic housing (2) of a Bourdon tube pressure gauge (1) into which a connection piece (4) of harder material having a cylindrical or conical sealing surface pairing (FIG. 8) is pressed over an elastically shaped, annular axial lock (9) away so that the Bourdon tube pressure gauge (1) is rotatable in relation to the connecting piece (4).
• the measuring mechanism (32) is with suitable joining technique, such as an adapter piece (6) fixedly connected to the elastic tube spring (5) and a
• the sealing surface pairing (8) between the connector (4) and receiving point (7) of the plastic housing (2) is based on the elastic bias of the materials involved, in particular the plastic material of the plastic housing (2).
• the preload can be generated in a planar manner by the use of cylindrical or conical press fits, but also locally concentrated by orbital form elements, such as wedge, bead or triangular rings (14). In this way, the rotatability of the plastic housing (2) together with the components located in this, for example of the measuring mechanism (32), possible.
• the axis of rotation can be aligned with Bourdon tube pressure gauges with axial fitting with the axis of the pointer shaft (29) or not.
• the bias is typically already during the factory assembly of the Bourdon tube pressure gauge, in particular during the pressing of the connector (4) in the axial or radial receiving point (7) of the plastic housing (2) generated. This will create inequalities, such as those in an on-the-spot
• the Axialsperre (9) can, for example in the form of
• Fig. 1 Rotatable Bourdon tube pressure gauge with radial connection
• Fig. 2 Connection of the measuring unit of a Bourdon tube pressure gauge with the
• Plastic housing Fig. 3 Locking mechanism, section A-A
• FIG. 1 an inventive Bourdon tube pressure gauge (1) is shown by way of example with radial connection.
• the Bourdon tube pressure gauge (1) consists of a plastic housing (2) with a connecting channel (3) located in it, through which a connection piece of the adapter piece (6) a tight connection between the interiors of the connecting piece (4) and the elastic tube spring ( 5), this as part of the measuring unit (32), is produced.
• the adapter piece (6) is firmly connected to the elastic tube spring (5).
• the entire measuring unit (32) together with the elastic tube spring (5) is in turn mechanically fixedly connected to the plastic housing (2), for example via a clip connection shown in Figure 2, which consists of a holding web (30) and a clip holder ( 31) on
• Plastic housing (2) and matching plug-in elements of the measuring console (28) consists.
• the fixed point of the elastic tube spring (5) with respect to the measuring console (28) forms a fixed joint connection between the adapter piece (6) and the measuring console (28).
• On the plastic housing (2) of the Bourdon tube pressure gauge (1) shown in Fig. 1 is a radial
• the sealing surface pairing (8) is formed in the example shown in Fig.l with a cylindrical or steep conical outer sealing surface (10) and with just such an inner sealing surface (12) of the receiving point (7) on the one hand and mating surfaces (13) of the connecting piece (4) on the other , wherein on the mating surfaces (13) of the connector (4) are a plurality of projecting wedge rings (14), the prestressing reinforcing in the plastic material of the inner surface (10) and the outer surface (12) of the Aufhahmestelle (7) press and by their shape brace against tensile forces at the junction.
• the annular axial lock (9) is in the exemplary embodiment according to Fig.l as an integral part of the receiving point (7) of elastic pawl (17) at the front end of the Aufhahmestelle (7), with a locking ring (18) of the connecting piece (4). interact.
• the locking hooks (17) of the receiving point (7) snap behind the locking ring (18) of the Anschuss choirs (4) when the connector (4) is pressed sufficiently far on the receiving point (7).
• a latching mechanism for the rotation of the Bourdon tube pressure gauge (1) is proposed relative to its connection piece (4), which can be seen in Fig.l and Fig.3.
• the rotational angle position of the Bourdon tube pressure gauge (1) relative to the connector (4) can be set by latching, that between the Aufhahrnestelle (7) of the plastic housing (2) and the connecting piece (4) is inserted a locking ring (16), which positively surrounds the four-, six- or octagonal edge (23) of the connecting piece (4) over part of its height and has one or more snap-in hooks or teeth (22, 27) which are elastically yielding or suspended in the illustrated example 2 , so that these latching hooks or teeth (22, 27) of the latching ring (16) between the teeth of a at the receiving point (7) of the plastic housing (2) mounted sprocket (25) engage.
• the shape of the latching hooks or teeth (22, 27) and the shape of the corresponding teeth of the sprocket (25) is wedge-shaped in the embodiment shown in Figure 3, whereby a certain direction of rotation, for example, the direction of rotation for tightening the fitting ( 4).
• the shape can also be triangular or bead-shaped, whereby both directions of rotation and different cogging torques can be realized.
• limit torques can be defined up to which the plastic housing (2) rotates with the connection piece (4). If the limit torque is exceeded, this is signaled by corresponding latching pulses and noises.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Measuring Fluid Pressure (AREA)

Applications Claiming Priority (2)

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• 2008
  • 2008-09-26 DE DE200810049152 patent/DE102008049152A1/de not_active Withdrawn
• 2009
  • 2009-07-21 EP EP09775989A patent/EP2326930A1/de not_active Withdrawn
  • 2009-07-21 RU RU2010125905/28A patent/RU2010125905A/ru not_active Application Discontinuation
  • 2009-07-21 WO PCT/DE2009/001013 patent/WO2010034273A1/de active Application Filing

Non-Patent Citations (1)

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