Search

CN-115461601-B - Connection sleeve for a fluid-conducting line system

CN115461601BCN 115461601 BCN115461601 BCN 115461601BCN-115461601-B

Abstract

The invention relates to a connection sleeve (1) for a fluid-conducting line system, having a fluid channel (2) extending along a fluid channel axis (X), wherein the fluid channel (2) can be connected to a line channel of the line system at least at a first connection end (4) and a second connection end (6) of the connection sleeve (1). A measuring section (10) is formed between the first connection (4) and the second connection (6), wherein a sensor system for measuring the pressure of the medium flowing in the fluid channel (2) is arranged. The sensor system has a connection interface with which it can be connected to a control unit for measuring the pressure in the fluid channel (2), and has at least two strain gauge sensors for measuring the pressure, which are arranged offset on the outer wall (14) of the measuring section (10) on the circumference around the fluid channel axis (X). The invention also relates to a control unit for connection to a sensor system for pressure measurement of a fluid pressure of the above-mentioned connection sleeve (1), said control unit having connection means for data connection to the sensor system of the connection sleeve (1) and calculation means for calculating the fluid pressure in the connection sleeve (1) on the basis of the received data and on the basis of line-and/or medium-specific parameters stored in the control unit.

Inventors

  • POTT HARALD
  • MARTIN BAYER

Assignees

  • 福士流体有限公司

Dates

Publication Date
20260505
Application Date
20210503
Priority Date
20200513

Claims (20)

  1. 1. A connection sleeve (1) for a fluid-conducting line system, having a fluid channel (2) extending along a fluid channel axis (X), wherein the fluid channel (2) can be connected to a line channel of the line system at least at a first connection end (4) and a second connection end (6) of the connection sleeve (1), wherein a measuring section (10) is formed between the first connection end (4) and the second connection end (6), in which measuring section a sensor system for measuring a pressure of a medium flowing in the fluid channel (2) is provided, wherein the sensor system has a connection interface with which the sensor system can be connected to a control unit for measuring a pressure in the fluid channel (2), Wherein the sensor system for measuring pressure has at least two strain gauge sensors which are arranged offset on the outer wall (14) of the measuring section (10) on the circumference around the fluid channel axis (X), characterized in that the strain gauge sensors are each arranged in a measuring groove (24), the measuring grooves (24) being formed in the outer wall (14) of the measuring section (10) and extending parallel to the fluid channel axis (X), Wherein the respective measuring groove (24) has a flat measuring groove bottom (28) extending parallel to the fluid channel axis (X), wherein a receiving groove (18) extending circumferentially around the outer wall (14) of the measuring section (10) is formed in the outer wall (14) of the measuring section (10) for integrating the electronic circuit of the sensor system and/or the strain gauge sensor.
  2. 2. The connection sleeve (1) according to claim 1, characterized in that the strain gauge sensors are arranged circumferentially offset by 90 ° or 180 ° about the fluid channel axis (X).
  3. 3. The connection sleeve (1) according to claim 1, characterized in that the strain gauge sensors are arranged offset from each other along the fluid channel axis (X).
  4. 4. The connection sleeve (1) according to claim 1, characterized in that the strain gauge sensors are designed as strain gauges (12) each having at least one strain measuring sensor (13).
  5. 5. The connection sleeve (1) according to claim 4, characterized in that the strain gauges (12) extend in their longitudinal direction along the fluid channel axis (X).
  6. 6. The connection sleeve (1) according to claim 4, characterized in that the strain gauges (12) each have two strain measuring sensors (13) on a carrier film (16), wherein a first strain measuring sensor (13) measures the strain in the longitudinal direction and a second strain measuring sensor (13) measures the strain in the transverse direction.
  7. 7. The connection sleeve (1) according to claim 4, characterized in that the strain measurement sensor (13) is electrically connected in a sensor system forming a full wheatstone bridge.
  8. 8. The connection sleeve (1) according to claim 4, characterized in that at least one strain measurement sensor (13) is electrically connected in the sensor system for resistance interrogation.
  9. 9. The connection sleeve (1) according to claim 4, characterized in that the strain gauge (12) is a highly sensitive strain gauge (12) which can advantageously measure strain with an accuracy of at least 10 -4 mm.
  10. 10. The connection sleeve (1) according to claim 4, characterized in that the strain gauge (12) is fitted on the connection sleeve (1) by means of a combination of bonding and glass welding.
  11. 11. The connection sleeve (1) according to claim 10, characterized in that the strain gauge (12) is designed as a silicon strain gauge (12).
  12. 12. The connection sleeve (1) according to claim 1, characterized in that the respective measuring groove (24) is formed symmetrically with respect to the fluid channel axis (X).
  13. 13. The connection sleeve (1) according to claim 1, characterized in that the measurement groove depth (26) of the measurement groove bottom (28) of the measurement groove (24) corresponds at most to the smallest circumference of the connection sleeve (1) outside the measurement section (10).
  14. 14. The connection sleeve (1) according to claim 1, characterized in that the connection sleeve (1) has an anti-corrosion coating at least on an outer surface (30) facing away from the fluid channel (2), wherein the strain gauge sensor is arranged on the anti-corrosion coating.
  15. 15. The connection sleeve (1) according to claim 1, characterized in that a voltage source is provided on the connection sleeve (1) and by means of which a supply voltage can be applied to the sensor system.
  16. 16. The connection sleeve (1) according to claim 15, characterized in that the voltage source is a battery, which is arranged in a receiving groove (18) of the connection sleeve (1).
  17. 17. The connection sleeve (1) according to claim 1, characterized in that the connection interface of the sensor system is designed as an electrically inductive connection interface, through which a supply voltage for the sensor system can be transmitted.
  18. 18. The connection sleeve (1) according to claim 1, characterized in that the connection interface of the sensor system is designed as a wireless connection interface, by means of which data can be transmitted from or to the sensor system.
  19. 19. The connection sleeve (1) according to claim 1, characterized in that the connection interface of the sensor system is designed as a wireless connection interface, through which data can be transmitted from and to the sensor system.
  20. 20. The connection sleeve (1) according to claim 18, characterized in that the connection interface of the sensor system is designed as an electrically inductive connection interface, by means of which data can be transmitted from or to the sensor system.

Description

Connection sleeve for a fluid-conducting line system Technical Field The present invention relates to a connection sleeve for a fluid-conducting line system. The connection sleeve has a fluid channel extending along a fluid channel axis, wherein the fluid channel is connectable with a pipeline channel of a pipeline system at least at a first connection end and a second connection end of the connection sleeve. A measuring section is formed between the first connection end and the second connection end, wherein a sensor system for measuring the pressure of the medium flowing in the fluid channel is arranged. The sensor system has a connection interface, via which the sensor system can be connected to a control unit for measuring the pressure in the fluid channel. Furthermore, the invention comprises a control unit for connection to the sensor system for pressure measurement of the fluid pressure of the connection sleeve. Background In a pipeline system for guiding a fluid, in particular a hydraulic system, the maximum pressure may be up to 3200 bar, but in particular the maximum pressure may also exceed 3200 bar. Conventional pressure sensors for hydraulic systems are screwed into the hydraulic block at a T-shaped connecting sleeve or a bore specially provided for this purpose. This requires a great deal of construction effort and space. The sensor itself then typically uses a diaphragm made of a sensitive material that is in contact with the medium in the fluid channel. Due to the sensitive diaphragm, the medium compatibility is limited here, so that the entire line system is only suitable for a specific medium, or the line system only allows pressure monitoring of a selected medium. In particular, hydrogen is very corrosive as a medium. Thus, for example, the pipeline system delivering hydrogen has a reduced service life of the known sensors. Another disadvantage is the flow effect through the T-junction box branch. On the one hand, turbulence (which results in flow losses) and cavitation occur at the branching point. In cavitation, air segregation (Luftausscheidung) occurs due to shear motion in the medium. Air segregation causes temperature dependent combustion, which, depending on the diesel effect, can lead to aging of the medium, in particular the oil, and to collection of deposits or combustion residues. Thus, cavitation and diesel effects mean that the pipeline system must be maintained more frequently and that the service life of the pipeline system is shortened. Disclosure of Invention The object of the present invention is to provide a connection sleeve which solves the problems known in the prior art, in particular optimizes the service life and maintenance intervals and preferably the usability in relation to the medium, advantageously reducing the flow losses. According to the invention, this object is achieved by the features of the connecting sleeve according to claim 1 in that the sensor system for measuring pressure has at least two strain gauge sensors which are arranged offset on the outer wall of the measuring section on the circumference around the axis of the fluid channel. High pressures in the line system can lead to a slight expansion of the relevant components, in particular the connection sleeve, in the elastic range. The material of the connection sleeve is correspondingly stretched in all directions under pressure. Such an invisible extension is recorded by a strain gauge sensor arranged on the connection sleeve and output as a physical change, in particular as a resistance change or as a voltage change, or forwarded to the control unit via the connection interface. The invention is based on the finding that the pressure in the pipeline system can be inferred by measuring the strain or the change in length occurring at the connection sleeve and clarifying it. The change in the length of the connecting sleeve is directly related to the pressure recorded in the line system, so that the strain gauge acting as a pressure sensor is not in contact with the medium guided in the line system. The coupling sleeve according to the invention also enables a measuring method which can be easily and space-saving retrofitted into existing pipeline systems and which can be adapted to virtually any medium, with the only proviso that the coupling sleeve itself, i.e. its material, is adapted to such medium. This means that the sensor system can also be used for corrosive media, such as hydrogen, for which it is currently difficult or expensive to find a suitable sensor. Preferably, the strain gauge sensors are arranged distributed at 90 ° or 180 ° circumferentially around the fluid channel axis. In particular, the strain gauge sensors are arranged offset from each other along the fluid channel axis. Thus, external influences, such as strains or stresses induced by external effects onto the pipeline system, may have been compensated for by the arrangement and interconnection (Verschaltung) of strain