Temperature decoupler and system for monitoring and / or determining first pressure of medium

Abstract

The invention relates to a temperature decoupler (1) for a pressure transducer (2), comprising a main body (3), the main body (3) comprising a longitudinal axis (4), a first end region (5) and a second end region (6), the first end region (5) being designed such that it can be connected to the pressure transducer (2), the second end region (6) being designed such that it can be connected to the pressure transducer (2), and the second end region (6) being designed such that it can be connected to the pressure transducer (2). The first end region (5) and the second end region (6) are designed such that it can be connected to a process connection (7), the body (3) being designed between the first end region (5) and the second end region (6) in the form of a one-or multi-head spiral (8) wound around the longitudinal axis (4), the body (3) comprising a hole (9), the hole (9) being designed such that it can be connected to a process connection (7). The hole (9) extends along the longitudinal axis (4) and can be filled with a pressure transmission device. The invention also relates to a system (10) comprising such a temperature decoupler (1).

Description

Technical Field

[0001] The present invention relates to a temperature decoupler for a pressure measurement transducer and a system for monitoring and / or determining a first pressure of a medium. Background Technology

[0002] In pressure measurement technology, known transducers include absolute pressure transducers, differential pressure transducers, and relative pressure transducers. An absolute pressure transducer definitively determines the present pressure of a medium, that is, the present pressure of the medium relative to a vacuum. A differential pressure transducer determines the difference between two different pressures of a medium or medium. In the case of a relative pressure transducer, the measured pressure of the medium is determined relative to a reference pressure, where atmospheric pressure present in the environment is used as the reference pressure.

[0003] Pressure measurement transducers have a pressure-sensitive measuring element, i.e., a pressure sensor, in each case where pressure is located on a first and a second surface. In the case of relative and absolute pressure measurement transducers, the pressure determined for the medium acts on the first surface of the pressure sensor, while the absolute pressure or reference pressure acts on the second surface. In the case of differential pressure measurement transducers, the first and second pressures of the medium are located on these two surfaces. The measuring element deflects according to the relative pressure formed by the difference between the pressures located on these two surfaces. This deflection is converted into an electrical signal based on the relative pressure by electronic devices, which can then be used for further processing and / or evaluation. Capacitive and piezoresistive pressure sensors are used for this purpose. Many such pressure measurement transducers are manufactured and sold by the Endress+Hauser Group.

[0004] In the case of absolute pressure measuring transducers and relative pressure measuring transducers, the pressure of the medium is sensed by means of a process-oriented pressure-sensitive isolation diaphragm, and in the case of differential pressure measuring transducers, the pressure of the medium is sensed by means of two process-oriented pressure-sensitive isolation diaphragms. The isolation diaphragm comprises a diaphragm bed, which is typically used to form the diaphragm and to limit the movement of the diaphragm under overload conditions. Additionally, a pressure-transmitting fluid is applied that transmits the pressure of the medium acting on the isolation diaphragm to one of the two faces of the pressure sensor along the pressure transmission path.

[0005] The pressure measuring transducer may have an additional isolating diaphragm, making the term pressure intermediation appropriate. An additional second isolating diaphragm is positioned after the (first) isolating diaphragm, such that the pressure of the medium is first sensed by the (first) isolating diaphragm and then transmitted to the additional second isolating diaphragm. Therefore, the pressure of the medium supplied to the pressure sensor ultimately occurs via the second isolating diaphragm. By using two sequentially connected isolating diaphragms, media infiltration into the area of ​​the pressure sensor is prevented as much as possible. Generally, the diaphragm intermediation is adapted such that in the event of a leak in the (first) isolating diaphragm, only the (first) isolating diaphragm needs to be replaced, while the second isolating diaphragm and the pressure sensor remain in place.

[0006] In the case of pressure measuring transducers and pressure media, the pressure sensor is generally spaced apart from the medium due to its temperature sensitivity. At high process temperatures, a temperature decoupler is often applied to protect the pressure sensor from the high temperatures. Typically, such a temperature decoupler is manufactured as a long, rotationally symmetrical, rotating component positioned between the isolating diaphragm and the pressure sensor. Since the temperature decoupler is sometimes exposed to forces such as vibration, it must possess sufficient bending strength. This is generally ensured by a correspondingly large cross-section of the temperature decoupler. However, because this cross-section is crucial for the heat flux through the temperature decoupler, the temperature decouplers of the present invention have a significant length for the desired temperature decoupling, which in turn necessitates higher space requirements, construction material demands, and costs. Furthermore, due to the significant length of the temperature decoupler, creating pressure-transmitting fluid orifices or capillary channels along its longitudinal axis becomes difficult.

[0007] Therefore, one object of the present invention is to provide a temperature decoupler that can be manufactured in a simple manner. Summary of the Invention

[0008] The objective of the invention is achieved by the temperature decoupler as claimed in claim 1, the system for monitoring and / or determining the first pressure of a medium as claimed in claim 8, and the system for monitoring and / or determining the first pressure of a medium as claimed in claim 10.

[0009] Regarding the temperature decoupler, this objective is achieved by a temperature decoupler for a pressure measurement transducer, comprising: Matrix The substrate includes a longitudinal axis, a first end region, and a second end region. The first end region is configured to connect to the pressure measuring transducer, and the second end region is configured as a process connector with a first isolation diaphragm, which is capable of contacting the first pressure or is configured to connect to the process connector. The matrix is ​​implemented in the form of a one-ended helix or a multi-ended helix wound around the longitudinal axis between the first end region and the second end region. The substrate includes pores that extend along the longitudinal axis and are capable of being filled with pressure-transmitting fluid.

[0010] By implementing the substrate as a helix, a high surface area is achieved, resulting in high convection of ambient air. Due to this improved form of the substrate, the temperature decoupler of the present invention can be manufactured significantly shorter than conventional temperature decouplers while maintaining the same heat exchange. The shorter length of the temperature decoupler of the present invention significantly facilitates the fabrication of the orifice, as the fabrication of the orifice is particularly difficult in the case of a long substrate. Furthermore, the helix imparts high robustness to the temperature decoupler of the present invention to withstand conditions present in the process system, such as high temperatures and vibrations.

[0011] The temperature decoupler, or at least the helix, can be manufactured, for example, by precision casting or 3D printing. The helix can be implemented as left-handed or right-handed. The helix is ​​a threaded structure wound around the longitudinal axis. A multi-start helix is ​​obtained by arranging another helix with a defined pitch and a defined rotation, or offset relative to other helices, having a first helix.

[0012] In further development, the spiral is either a two-ended spiral or a three-ended spiral. Two-ended or three-ended spirals provide a particularly high surface area for high heat exchange.

[0013] In one embodiment, the spiral has a predetermined slope.

[0014] Preferably, the slope is at an angle of 40° to 75°, particularly 40° to 50°, and especially 45°.

[0015] In an additional embodiment, the diameter of the substrate decreases from the second end region in the direction of the first end region. This reduces heat conduction in the direction of the pressure measuring transducer. Additionally, it ensures that the temperature decoupler is most stable in the direction of the process connector.

[0016] Another embodiment specifies that the diameter of the spiral steadily decreases from the second end region in the direction of the first end region. In particular, the diameter of the spiral monotonically decreases from the second end region in the direction of the first end region.

[0017] Advantageously, the thickness of the helix in the region along the longitudinal axis is less than its thickness in the radially outer region. This embodiment of the helix increases its robustness and ensures that heat is effectively dissipated into the ambient air. The thickness of the helix can be particularly implemented to be thickest in the edge region of the helix located opposite to the longitudinal axis. In particular, the helix can have a cross-section in the form of rotor blades or a cloverleaf.

[0018] Furthermore, the object of the present invention is achieved by a system for monitoring and / or determining a first pressure of a medium, the system comprising: A pressure measuring transducer having a first connection area and a pressure sensor, the pressure sensor being capable of contacting a first pressure on a first surface and a second pressure on a second surface. A process connector having a second connection area and a first isolation diaphragm, the first isolation diaphragm being capable of contacting the first pressure. According to any one of the foregoing embodiments, the temperature decoupler, wherein the first end region is connected to the first connection region, wherein the second end region is connected to the second connection region, and A pressure transmission path is implemented to transmit the first pressure from the first isolation diaphragm through the orifice to the first surface of the pressure sensor.

[0019] The system of the present invention includes the temperature decoupler of the present invention, which provides improved heat exchange with the environment due to its substrate being partially implemented in a helical form, allowing the temperature decoupler to be shorter than conventional temperature decouplers. The pressure transmission path is preferably filled with a pressure transmission fluid. A second end region is implemented in the system of the present invention so that it can be connected to the process connector.

[0020] In a further development, the pressure measuring transducer includes a second isolation diaphragm arranged along the pressure transmission path, such that a first section of the pressure transmission path transmits the first pressure from the first isolation diaphragm through the orifice to the second isolation diaphragm, and a second section of the pressure transmission path transmits the first pressure from the second isolation diaphragm to the first surface of the pressure sensor. The second isolation diaphragm prevents media from penetrating into the pressure measuring transducer in the event of leakage from the first isolation diaphragm.

[0021] Regarding the system, this objective is further achieved by a system for monitoring and / or determining a first pressure of the medium, the system comprising: A pressure measuring transducer having a first connection area and a pressure sensor, the pressure sensor being capable of contacting a first pressure on a first surface and a second pressure on a second surface. According to any one of the foregoing embodiments, the temperature decoupler, wherein the first end region is connected to the first connection region, and wherein the second end region is implemented as a process connector having the first isolation diaphragm, and A pressure transmission path is implemented to transmit the first pressure from the first isolation diaphragm through the orifice to the first surface of the pressure sensor.

[0022] In the second system of the present invention, the second end region is a process connector with a first isolation diaphragm. Therefore, the process connector is integrated into the temperature decoupler.

[0023] In a further development, the pressure measuring transducer includes a second isolation diaphragm arranged along a pressure transmission path, such that a first segment of the pressure transmission path transmits the first pressure from the first isolation diaphragm through the orifice to the second isolation diaphragm, and a second segment of the pressure transmission path transmits the first pressure from the second isolation diaphragm to the first surface of the pressure sensor. Attached Figure Description

[0024] The invention will now be explained in more detail with reference to the accompanying drawings, which are shown below: Figure 1a The temperature decoupler of the present invention is shown in the front view and longitudinal section.

[0025] Figure 1b Cross-section of the temperature decoupler of the present invention.

[0026] Figure 2 The second embodiment of the temperature decoupler of the present invention.

[0027] Figure 3 The third embodiment of the temperature decoupler of the present invention.

[0028] Figure 4 The first embodiment of the system of the present invention.

[0029] Figure 5 The second embodiment of the system of the present invention.

[0030] Figure 6 The third embodiment of the system of the present invention.

[0031] Figure 7 The fourth embodiment of the system of the present invention. Detailed Implementation

[0032] Figure 1a The temperature decoupler 1 of the present invention shown includes a base 3 having a longitudinal axis 4. The base 3 has a first end region 5 and a second end region 6, the first end region 5 being configured to connect to a pressure measuring transducer 2, and the second end region 6 being configured to connect to a process connector 7. Furthermore, the base 3 has a hole 9 extending along the longitudinal axis 4 and capable of being filled with a pressure-transmitting fluid, such as silicone oil.

[0033] Between the first end region 5 and the second end region 6, the substrate 3 is implemented in the form of a one-ended helix or a multi-ended helix 8 wound around the longitudinal axis 4. Figure 1a In the illustrated embodiment, a three-headed helix 8 is shown, with its three heads arranged 120° offset from their adjacent heads. The three heads are arranged in... Figure 1b As shown, the temperature decoupler 1 is observed in cross-section. However, the helix 8 can also be implemented with only one head, two heads, or even more than three heads. As an example, the helix 8 is implemented with a cross-section in the form of a rotor blade. In this case, the thickness of the helix 8 in the region along the longitudinal axis 4 is less than the thickness in the radially outer region 19. The helix 8 can have a predetermined slope, having angles particularly 40° to 75°, particularly 40° to 50°, and particularly 45°. For example, Figure 1a The slope of the three-headed helix 8 with a slope of 45° is shown. The diameter of the base 3 can decrease steadily and / or monotonically from the second end region 6, particularly in the direction of the first end region 5.

[0034] Figure 2 A second embodiment of the temperature decoupler 1 of the present invention is shown, wherein the temperature decoupler 1 has a particularly short length.

[0035] Figure 3 A third embodiment of the temperature decoupler 1 of the present invention is shown. In this embodiment, the second end region 6 is implemented as a process connector 7, which includes a first isolation diaphragm 16. The first isolation diaphragm 16 is capable of contacting a first pressure p1 of the medium 20. The process connector 7 includes, for example, a connection region for connection to a container. Optionally, the substrate 3 may have a filling orifice 21 for filling the orifice 9 with a pressure-transmitting fluid. The filling orifice 21 may be incorporated into FIG. 1 and Figure 2 In the variant example of temperature decoupler 1 shown.

[0036] Figure 4A first embodiment of the system 10 of the present invention is shown. The system 10 is used to monitor and / or determine a first pressure p1 of a medium 20, and includes a pressure measuring transducer 2, a process connector 7, and a temperature decoupler 1. The process connector 7 includes a second connection region 15 for connection to the temperature decoupler 1, and the first isolation diaphragm 16 is capable of contacting the first pressure p1. The second connection region 15 is connected to a second end region 6 of the temperature decoupler 1. The first end region 5 of the temperature decoupler 1 is connected to a first connection region 11 of the pressure measuring transducer 2. The connections between the first connection region 11 and the first end region 5, and between the second connection region 15 and the second end region 6, can be formed, for example, by welding or joining.

[0037] In addition to the first connection area 11, the pressure measuring transducer 2 also includes a pressure sensor 12, which is capable of contacting a first pressure p1 on a first surface 13 and a second pressure p2 on a second surface 14 opposite to the first surface. The second pressure p2 can be, for example, the second pressure of the medium 20, ambient pressure, or absolute pressure, such as vacuum. The pressure measuring transducer 2 can be implemented as a differential pressure measuring transducer, a relative pressure measuring transducer, or an absolute pressure measuring transducer.

[0038] System 10 further includes a pressure transmission path 17, which is implemented to transmit a first pressure p1 from the first isolation diaphragm 16 through the hole 9 to the first surface 13 of the pressure sensor 12. The pressure transmission path 17 may be filled with a pressure transmission fluid, particularly hydraulic fluid.

[0039] Apart from Figure 2 In addition to the features shown in the variant examples, Figure 5 A second embodiment of the system of the present invention shown further includes a second isolation diaphragm 18 in the pressure measuring transducer 2. This second isolation diaphragm 18 is arranged along a pressure transmission path 17 such that a first segment 17a of the pressure transmission path 17 transmits a first pressure p1 from the first isolation diaphragm 16 through a hole 9 to the second isolation diaphragm 18, and a second segment 17b of the pressure transmission path 17 transmits the first pressure p1 from the second isolation diaphragm 18 to the first surface 13 of the pressure sensor 12. In the event of damage to the first isolation diaphragm 16, the second isolation diaphragm 18 prevents contamination of the pressure sensor 12.

[0040] Figure 6 and Figure 7 An embodiment of the system of the present invention is shown, in which the second end region 6 of the temperature decoupler 1 is implemented as a process connector 7 including a first isolation diaphragm 16. Additional features are similar to those already addressed. Figure 4 and Figure 5 Those characteristics described.

[0041] List of reference numerals

[0042] 1 Temperature decoupler

[0043] 2 Pressure Measurement Transducer

[0044] 3. Matrix

[0045] 4. Longitudinal axis

[0046] 5 First end region

[0047] 6 Second end region

[0048] 7 Process connectors

[0049] 8 spirals

[0050] 9 holes

[0051] 10 System

[0052] 11 First Connection Area

[0053] 12 Pressure Sensors

[0054] 13 First page

[0055] 14 Second page

[0056] 15 Second Connection Area

[0057] 16 First separating membrane

[0058] 17 Pressure transmission path

[0059] 17a First Section

[0060] 17b Second Section

[0061] 18 Second isolation membrane

[0062] 19 regions

[0063] 20 media

[0064] 21 Filling Hole

Claims

1. Temperature decoupler (1) for pressure measuring transducer (2), Including the matrix (3), in, The substrate (3) includes a longitudinal axis (4), a first end region (5), and a second end region (6). The first end region (5) is configured to be able to connect to the pressure measuring transducer (2). The second end region (6) is configured as a process connector (7) having a first isolation diaphragm (16) capable of contacting a first pressure (p1) or configured to connect to the process connector (7). The substrate (3) is implemented between the first end region (5) and the second end region (6) in the form of a one-headed helix (8) or a multi-headed helix (8) wound around the longitudinal axis (4). The substrate (3) includes a hole (9) that extends along the longitudinal axis (4) and is capable of being filled with a pressure-transmitting fluid.

2. The temperature decoupler (1) according to claim 1, in, The spiral (8) is a two-ended spiral or a three-ended spiral.

3. The temperature decoupler (1) according to any one of claims 1-2, in, The spiral (8) has a predetermined slope.

4. The temperature decoupler (1) according to claim 3, in, The slope is an angle of 40° to 75°, especially 40° to 50°, and especially 45°.

5. The temperature decoupler (1) according to any one of claims 1-4, in, The diameter of the substrate (3) decreases from the second end region (6) in the direction of the first end region (5).

6. The temperature decoupler (1) according to any one of claims 1-5, in, The diameter of the spiral (8) decreases steadily from the second end region (6) in the direction of the first end region (5).

7. The temperature decoupler (1) according to any one of claims 1-6, in, The thickness of the spiral (8) in the region along the longitudinal axis (4) is less than the thickness in the radially outer region (19).

8. A system (10) for monitoring and / or determining a first pressure (p1) of a medium (20), including - A pressure measuring transducer (2), the pressure measuring transducer (2) having a first connection area (11) and a pressure sensor (12), the pressure sensor (12) being able to contact the first pressure (p1) on a first surface (13) and being able to contact the second pressure (p2) on a second surface (14). - A process connector (7) having a second connection area (15) and a first isolation diaphragm (16) capable of contacting the first pressure (p1). - The temperature decoupler (1) according to any one of claims 1-7, wherein, The first end region (5) is connected to the first connecting region (11), wherein the second end region (6) is connected to the second connecting region (15), and - Pressure transmission path (17), which is implemented to transmit the first pressure (p1) from the first isolation diaphragm (16) through the hole (9) to the first surface (13) of the pressure sensor (12).

9. The system (10) according to claim 8, in, The pressure measuring transducer (2) includes a second isolation diaphragm (18) arranged along the pressure transmission path (17), such that a first section (17a) of the pressure transmission path (17) transmits the first pressure (p1) from the first isolation diaphragm (16) through the hole (9) to the second isolation diaphragm (18), and a second section (17b) of the pressure transmission path (17) transmits the first pressure (p1) from the second isolation diaphragm (18) to the first surface (13) of the pressure sensor (12).

10. A system (10) for monitoring and / or determining a first pressure (p1) of a medium (20), comprising - A pressure measuring transducer (2), the pressure measuring transducer (2) having a first connection area (11) and a pressure sensor (12), the pressure sensor (12) being able to contact the first pressure (p1) on a first surface (13) and being able to contact the second pressure (p2) on a second surface (14). - The temperature decoupler (1) according to any one of claims 1-7, wherein, The first end region (5) is connected to the first connection region (11), wherein the second end region (6) is implemented as a process connector (7) having the first isolation diaphragm (16), and - Pressure transmission path (17), which is implemented to transmit the first pressure (p1) from the first isolation diaphragm (16) through the hole (9) to the first surface (13) of the pressure sensor (12).

11. The system (10) according to claim 10, in, The pressure measuring transducer (2) includes a second isolation diaphragm (18) arranged along the pressure transmission path (17), such that a first section (17a) of the pressure transmission path (17) transmits the first pressure (p1) from the first isolation diaphragm (16) through the hole (9) to the second isolation diaphragm (18), and a second section (17b) of the pressure transmission path (17) transmits the first pressure (p1) from the second isolation diaphragm (18) to the first surface (13) of the pressure sensor (12).

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