Flow detector and use of a rotor

Abstract

The invention relates to a flow detector (1) for measuring a flow rate and additionally or alternatively for measuring a flow rate, comprising a rotor (2), the axis of rotation (8) of which is arranged transversely, in particular orthogonally, to the flow direction of the fluid. The invention also relates to the use of a rotor (2) in a flow detector (1).

Description

Technical Field

[0001] The invention relates to a flow probe for measuring a flow velocity and additionally or alternatively for measuring a flow rate, the flow probe having a rotor. Such flow probes are widely used in practice.

[0002] The invention also relates to the use of a rotor in a flow detector. Such use is known in the prior art. Background Art

[0003] In the prior art, flow probes are often used that have an impeller as a rotor, the axis of rotation of which is arranged along the flow direction of the fluid (gas or liquid). Flow probes with impellers must be oriented very accurately in order to measure exact flow velocities and / or flow rates. Slight errors in the orientation of the flow probe can lead to larger measurement errors. A disadvantage of conventional impeller probes is that the flow maximum must be found in the measuring channel, since the flow in the channel is usually not laminar. Therefore, the maximum value of the flow velocity must be found with the aid of a slight rotational movement of the impeller probe. In the prior art, the flow probe therefore has a directional dependency. The present invention addresses this and intends to overcome this disadvantage of the prior art, namely the directional dependency of conventional flow probes. Summary of the invention

[0004] The object of the present invention is to improve the measuring accuracy of a flow sensor with respect to the flow velocity and, additionally or alternatively, with respect to the flow rate.

[0005] This object is achieved by the features of the independent claim. Advantageous embodiments are described in the dependent claims.

[0006] It should be noted that the features listed separately in the dependent claims can be combined with each other in any technically meaningful manner and define other designs of the present invention. In addition, the features given in the claims are described and elaborated in more detail in the specification, wherein other preferred designs of the present invention are shown.

[0007] In order to achieve the proposed task, the present invention proposes the features of claim 1. Therefore, in particular according to the present invention, in a flow detector of the type described at the beginning, in order to achieve the described task, it is proposed that the axis of rotation of the rotor is arranged transversely to the flow direction of the fluid, i.e., a gas or a liquid. Preferably, the axis of rotation of the rotor is arranged orthogonally to the flow direction of the fluid. Here, for example, angles between 85° and 95° or angles within the range of measurement accuracy and / or manufacturing tolerances of around 90° are referred to as orthogonal. As a result, the direction independence of the flow detector can be ensured and the measurement accuracy of the flow velocity and / or flow rate can be improved. Mechanical orientation in the flow channel is no longer necessary, which also shortens the installation time of the flow detector.

[0008] In order to achieve the proposed task, the present invention proposes the features of claim 2, alternatively or additionally. Therefore, according to the present invention, in particular in a flow probe of the type described at the beginning, in order to achieve the described task, it is proposed that the above-mentioned rotor rotation axis is oriented along the longitudinal axis of the flow probe. As a result, the measurement accuracy of the flow probe is improved, especially in the case of non-laminar flow. For example, the connecting line between the handle and the distal end can be called the longitudinal axis. Alternatively or additionally, for example, the longitudinal axis can be said to be the longest axis of the flow probe. The longitudinal axis can also be predetermined, for example, by the handle of the flow probe.

[0009] Advantageous embodiments of the invention are described below, which can optionally be combined with the features according to claim 1 and / or claim 2 either alone or in combination with features of other embodiments.

[0010] In an advantageous embodiment, it can be provided that the rotor is arranged in a cage. Thus, the rotor can be protected from mechanical contact during installation and overall.

[0011] For example, the holder can be designed in such a way that a flow direction of the fluid is defined, for example the flow direction already mentioned. In this way, the flow of the fluid can be measured in a defined manner.

[0012] In an advantageous embodiment, it can be provided that the rotor is an H-Darrieus rotor and additionally or alternatively a Savonius rotor. The directional dependence of the measured values, in particular the flow velocity and / or the flow rate, can thus be reduced.

[0013] The H-Darrieus rotor has a central rotating area and a plurality of rotor blades, which are connected to the rotating area by means of supports. The rotor blades are arranged parallel to the axis of rotation. The H-Darrieus rotor is an extension of the Darrieus rotor, in which the rotor blades merge with the axis of rotation.

[0014] The Savonius rotor has curved rotor blades which are connected to the central rotating region of the rotor without support. The rotor blades are arranged in a mirror-antisymmetric manner with respect to the axis of rotation.

[0015] In the present invention, the rotor can be an H-Darrieus rotor or a Savonius rotor, or a mixture of an H-Darrieus rotor and a Savonius rotor. The rotation axis of the rotor is arranged orthogonally to the flow direction of the fluid or oriented along the longitudinal axis of the flow detector.

[0016] In an advantageous embodiment, it can be provided that the rotor has a magnetic element which cooperates with a Hall sensor in order to measure the rotational speed of the rotor. Thus, the rotational speed of the rotor can be measured efficiently and simply.

[0017] In an advantageous embodiment, it can be provided that the Hall sensor is formed on the holder or on the probe head. Thus, the Hall sensor can be mounted on the flow probe in a vibration-free manner.

[0018] The flow probe includes a holder, a probe head and a rotor.

[0019] In an advantageous embodiment, it can be provided that the cage has flow openings through which flow can pass. Thus, the fluid can flow through the cage and drive the rotor located in the cage.

[0020] In an advantageous embodiment, it can be provided that the rotor has rotor blades which are arranged eccentrically with respect to the rotation axis of the rotor. Preferably, the rotor blades are arranged parallel to the rotation axis of the rotor. Thus, the measuring accuracy of the flow sensor can be increased.

[0021] In an advantageous embodiment, it can be provided that the rotor blade coincides with the rotation axis of the rotor in an end region. Preferably, the rotor blade coincides with the end region of the rotation axis of the rotor without support. The mechanical stability of the rotor blade can thus be increased.

[0022] In an advantageous embodiment, it can be provided that the cage is cylindrical, so that the flow resistance in the flowing fluid can be reduced and the flow lines around the cage can be normalized.

[0023] In an advantageous embodiment, it can be provided that the rotor is made of metal or plastic. Thus, the rotor can be adapted to the type and flow conditions of the flowing fluid.

[0024] In an advantageous embodiment, it can be provided that the detector head is arranged on a holding frame. Preferably, the control and measuring electronics are installed in the detector head. Thus, a space-saving arrangement can be provided.

[0025] In an advantageous embodiment, it can be provided that the rotor blades are at an angle relative to the rotation axis of the rotor. Preferably, the rotor blades are not parallel relative to the rotation axis of the rotor. This can further increase the measurement accuracy.

[0026] In an advantageous embodiment, it can be provided that the rotor blades are curved, thereby reducing the flow resistance of the flow sensor.

[0027] In an advantageous embodiment, it can be provided that the rotor blade is connected to a central rotational region of the rotor, in particular the rotational axis, by means of a support portion. The mechanical stability of the rotor blade can thus be increased.

[0028] In an advantageous embodiment, it can be provided that the support portion encloses an angle of less than or equal to 90° with the axis of rotation. The rotor can thus be adapted to the flow channel characteristics as appropriate.

[0029] In an advantageous embodiment, it can be provided that the holding bracket is connected to the probe head by means of a thread, thereby ensuring the mechanical stability of the connection.

[0030] In an advantageous embodiment, it can be provided that the rotor blades are connected to the central rotation region of the rotor without support, thereby making it possible to provide a smaller and more space-saving arrangement.

[0031] In an advantageous embodiment, it can be provided that the rotor blades are arranged in a mirror-antisymmetrical manner around the axis of rotation. Thus, the direction independence of the measured values ​​can be ensured.

[0032] In order to solve the above-mentioned tasks, the features of the parallel claims related to the application of the rotor are provided according to the present invention. Therefore, in particular, in order to solve the above-mentioned tasks, according to the present invention, in an application of the type mentioned at the beginning, when a rotor, preferably an H-Darrieus rotor and / or a Savonius rotor, is used in a flow probe, the rotation axis of the rotor is arranged transversely to, in particular orthogonally to, the flow direction of the fluid. Alternatively or additionally, the rotation axis of the rotor can be arranged along the longitudinal axis of the flow probe. Therefore, this can achieve that the measured value (flow velocity and / or flow rate) is independent of the direction, for example, the measured value is independent of the rotation of the rotor / probe head around the longitudinal axis and / or an axis orthogonal to the flow direction. Therefore, the search for the maximum measured value can be omitted.

[0033] The invention will now be described in more detail with reference to several embodiments, but the invention is not limited to these. Other inventive variants and embodiments can be obtained by combining the features of one or more protective claims with each other and / or with one or more features of the embodiments and / or with the above-mentioned variants of the device and method according to the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The attached pictures are as follows:

[0035] FIG1 shows a flow detector according to the prior art in a straight view; and

[0036] FIG. 2 shows a perspective view of the prior art flow detector of FIG. 1 ; and

[0037] Figure 3shows a Savonius type rotor according to the present invention; and

[0038] Figure 4 shows an H-Darrieus type rotor according to the present invention; and

[0039] Figure 5 Another H-Darrieus type rotor with magnetic elements according to the present invention is shown; and

[0040] Figure 6 A cage with an H-Darrieus type rotor according to the invention is shown in a normal view; and

[0041] Figure 7 Shown in perspective Figure 6 A retainer having an H-Darrieus type rotor; and

[0042] Figure 8 The flow sensor according to the invention is shown in a schematic diagram. DETAILED DESCRIPTION

[0043] In the following description of various exemplary embodiments of the invention, functionally identical elements are provided with identical reference numerals even in the case of different designs or shapes.

[0044] For the sake of clarity, not all reference numerals are shown in the figures, although the elements may be present in the figures. However, the same reference numerals represent components and functional units that are functionally and / or structurally the same.

[0045] FIG. 1 shows a flow probe 1 according to the prior art in a direct view.

[0046] The flow probe 1 comprises a rotor 2, a holder 3 and a probe head 4. Only the distal end portion of the flow probe 1 is shown; for simplicity, the rod and the handle connected thereto are not shown.

[0047] The rotor 2 is designed as an impeller rotor 5. The impeller rotor has four rotor blades 6, which are arranged at an angle of 90° to each other. The flow probe 1 in the prior art must be adapted to the flow conditions during installation so that the flow probe provides reliable measurement results. For the flow probe 1, the maximum flow velocity must be found, which also prolongs the measurement duration. The rotation axis 8 (not shown here) of the impeller rotor 5 is oriented in the flow direction 22 of the fluid, that is, the liquid or gas. FIG. 2 shows the flow probe 1 in the prior art in FIG. 1 in a perspective view. The flow direction 22 is predetermined by the retaining frame 3.

[0048] The rotor 2 therefore has an axis of rotation 8 (perpendicular to the plane of the drawing in FIG. 1 ), which is oriented perpendicularly to the longitudinal axis 19 of the flow probe 1 .

[0049] Figure 3 The Savonius rotor 7 according to the invention is shown. The Savonius rotor 7 has two rotor blades 6 which are curved and arranged mirror-antisymmetrically about an axis of rotation 8. The axis of rotation 8 of the Savonius rotor 7 is oriented transversely, in particular orthogonally, to the flow direction of the fluid.

[0050] Figure 4 An H-Darrieus rotor 9 according to the invention is shown. The H-Darrieus rotor 9 has three rotor blades 6, which are connected to a central rotating region 11 via a support 10. The rotor blades 6 are arranged parallel to the rotation axis 8 of the H-Darrieus rotor 9. The support 10 forms an angle of 90° with the rotation axis 8. The rotation axis 8 of the H-Darrieus rotor 9 is oriented transversely, in particular orthogonally, to the flow direction of the fluid.

[0051] Figure 5 Another H-Darrieus rotor 9 according to the invention with a magnetic element 12 is shown. The H-Darrieus rotor 9 has three rotor blades 6, which are connected to a central rotating area 11 via a support 10. The rotor blades 6 are curved. The rotor blades 6 are angled, in particular not parallel, relative to the rotation axis 8 of the rotor 2. The support 10 is connected to the central rotating area 11 at an angle of 90°. The support 10 can also be connected to the central rotating area 11 at an angle of less than 90°. The magnetic element 12 cooperates with a Hall sensor (not shown here) to measure the rotation speed of the rotor 2. The Hall sensor is constructed on the holder 3 (not shown here) or on the detector head 4 (not shown here).

[0052] Figure 6 The holder 3 according to the invention with the H-Darrieus rotor 9 is shown in a normal view. The holder 3 has a thread 13, by means of which the holder 3 can be connected to the probe head 4 (not shown here). The holder 3 is designed to be cylindrical and has a flow opening 14 through which flow can flow. The rotor blades 6 of the H-Darrieus rotor 9 are connected to the central rotation area 11 by means of a support 10. The rotor blades 6 themselves are curved and are angled relative to the rotation axis 8 of the rotor 2.

[0053] Figure 7 Shown in perspective Figure 6 The retaining frame 3 having the H-Darrieus type rotor 9 is shown in FIG.

[0054] Figure 8 The flow probe 1 according to the invention is shown with a probe head 4 which can be used, for example, according to Figures 3 to 7The distal end 16 of the probe head 4 simultaneously forms the distal end 21 of the flow probe 1. A rod 18 is connected to the proximal end 15 of the probe head 4, which leads to a handle 17. The handle 17 ends at the proximal end 20 of the flow probe 1. The longitudinal axis 19 of the flow probe 1 coincides with the rotation axis 8 of the rotor 2, not shown in further detail.

[0055] It is proposed that in a flow probe 1 for measuring flow velocity and additionally or alternatively for measuring flow rate, the flow probe 1 has a rotor 2 , the rotation axis 8 of which is arranged transversely, preferably orthogonally, to the flow direction of the fluid.

[0056] Reference numerals list

[0057] 1Flow detector

[0058] 2 Rotors

[0059] 3 Cage

[0060] 4 Detector head

[0061] 5 Impeller rotor

[0062] 6 rotor blades

[0063] 7Savonius type rotor

[0064] 8 Rotation axis

[0065] 9H-Darrieus rotor

[0066] 10 Supporting part

[0067] 11Central rotating area

[0068] 12 Magnetic components

[0069] 13 threads

[0070] 14 circulation openings

[0071] 15 Proximal end of the detector head

[0072] 16 Far end of the detector head

[0073] 17 handles

[0074] 18 shots

[0075] 19 Longitudinal axis

[0076] 20 Proximal end of flow detector

[0077] 21 Distal end of flow detector

[0078] 22 Flow direction

Claims

1. A flow probe (1) for measuring flow velocity and / or flow rate, the flow probe comprising a rotor (2), characterized in that: The rotation axis (8) of the rotor (2) is arranged transversely, in particular orthogonally, to the flow direction of the fluid.

2. A flow detector (1) according to the preamble of claim 1 or claim 1, characterized in that The rotation axis (8) of the rotor (2) is oriented along the longitudinal axis (19) of the flow probe (1).

3. The flow detector (1) according to claim 1 or 2, characterized in that: The rotor (2) is arranged in a retaining frame (3).

4. A flow detector (1) according to any one of the preceding claims, characterized in that The rotor (2) is an H-Darrieus type rotor (9) and / or a Savonius type rotor (7).

5. A flow detector (1) according to any one of the preceding claims, characterized in that The rotor (2) has a magnetic element (12) which cooperates with a Hall sensor to measure the rotational speed of the rotor (2).

6. A flow detector (1) according to any one of the preceding claims, characterized in that The Hall sensor is constructed on the holding frame (3) or on the detector head (4).

7. A flow detector (1) according to any one of the preceding claims, characterized in that The holder (3) has a flow opening (14) through which flow can pass.

8. A flow detector (1) according to any one of the preceding claims, characterized in that The rotor (2) has rotor blades (6), in particular the rotor blades are arranged eccentrically, in particular parallel, with respect to an axis of rotation (8) of the rotor (2).

9. A flow detector (1) according to any one of the preceding claims, characterized in that The rotor blade (6) coincides with the axis of rotation (8) of the rotor (2) in an end region.

10. The flow detector (1) according to any one of the preceding claims, characterized in that The retaining frame (3) is cylindrical.

11. The flow detector (1) according to any one of the preceding claims, characterized in that The rotor (2) is made of metal or plastic.

12. A flow detector (1) according to any one of the preceding claims, characterised in that The detector head (4) is arranged on the holding frame (3), and in particular, a control and measuring electronic device is installed in the detector head (4).

13. A flow detector (1) according to any one of the preceding claims, characterised in that The rotor blades (6) are arranged at an angle, in particular non-parallel, to the axis of rotation (8) of the rotor (2).

14. A flow detector (1) according to any one of the preceding claims, characterised in that The rotor blades (6) are curved.

15. The flow detector (1) according to any one of the preceding claims, characterized in that The rotor blade (6) is connected to a central rotation region (11) of the rotor (2), in particular the rotation axis (8), by means of a support (10).

16. A flow detector (1) according to any one of the preceding claims, characterised in that The support portion (10) and the rotation axis (8) form an angle less than or equal to 90°.

17. A flow probe (1) according to any one of the preceding claims, characterised in that The retaining frame (3) is connected to the detector head (4) by means of a thread (13).

18. A flow detector (1) according to any one of the preceding claims, characterized in that The rotor blades (6) are connected to the central rotating region (11) of the rotor (2) without support.

19. A flow detector (1) according to any one of the preceding claims, characterised in that The rotor blades (6) are arranged in a mirror-antisymmetrical manner around the axis of rotation (8).

20. Use of a rotor (2), in particular an H-Darrieus rotor (9) and / or a Savonius rotor (7), in a flow probe (1), wherein: The rotation axis (8) of the rotor (2) is arranged transversely, in particular orthogonally, to a flow direction (22) of the fluid and / or along a longitudinal axis (19) of the flow sensor (1).

Images