Vibration sensor
A technology of vibration sensor and driver, which is applied in the directions of fluids, instruments, liquid level indicators, etc. that utilize vibration, and can solve problems such as disturbance, bolt position changes, and inability to distinguish electrical signals, and achieve the effect of suppressing interference modes
Active Publication Date: 2019-03-05
VEGA GRIESHABER GMBH & CO
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- Application Information
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Problems solved by technology
[0009] The drives known in the prior art are considered to have the disadvantage that mechanical actions on the mechanical transducer as well as external vibrations and oscillations can lead to changes in the bolt position
like Figure 4 As shown, since such a change in position generally represents an inclination of the permanent magnet with respect to the axis direction and thus with respect to the coil, here electrical signals may be induced in the coil which cannot be distinguished from the actual measurement signal, or which are at least Superimposed perturbatively on the actual measurement signal
Method used
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[0039] figure 1 A section through a vibration sensor 1 according to the invention is shown. The provided illustrations only schematically show the vibration sensor 1 and are not drawn to scale.
[0040] The vibration sensor 1 comprises a diaphragm 3 which can be excited to vibrate by a driver 5, wherein the driver 5 consists of a coil 9 electrically drivable and supported on a housing 19 of the sensor 1, a coil arranged in the coil 9 The core 21 is formed with the bolts 7 arranged on the diaphragm 3 . In this driver 5 shown, the bolt 7 is connected to the permanent magnet 10 via a so-called magnetic mount 8 screwed to the bolt 7 , so that the permanent magnet 10 is fixedly coupled to the diaphragm. The permanent magnets 10 are aligned and magnetized in the axial direction and on the prolongation of the bolt 7 . A current applied to 9 induces a magnetic field in the coil 9 which then attracts or repels the permanent magnet 10 arranged on the diaphragm 3 according to its ori...
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The present invention relates to a vibration sensor having a diaphragm and a driver, the diaphragm being energizable to vibrate, and a driver for vibrating the diaphragm and / or detecting vibration ofthe diaphragm, wherein the driver is an electromagnetic actuator and comprises a permanent magnet, a coil and at least one bolt coupled to the diaphragm, wherein the driver has a damping element embodied and arranged such that damping element suppresses the interference mode to a greater extent than the damping element suppresses the effective mode.
Description
technical field [0001] The invention relates to a vibration sensor according to the preamble of claim 1 . Background technique [0002] Vibration sensors known in the prior art are used, for example, as vibration limit switches, wherein the vibration sensor comprises a diaphragm which can be excited by a drive to vibrate, the diaphragm excites a mechanical transducer arranged on the diaphragm so that it vibration. Depending on the state in which the mechanical transducer is covered with the filling material and depending on the viscosity of the filling material, the mechanical transducer vibrates with a characteristic frequency which can be detected by the vibration sensor and converted into a measurement signal. [0003] Piezoelectric drivers and electromagnetic drivers for such vibration sensors are known in the prior art, and here it is assumed that the vibration sensor is used with an electromagnetic driver. [0004] image 3 and Figure 4 A prior art driver is shown....
Claims
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IPC IPC(8): G01H11/02
CPCG01H11/02B06B1/045G01F23/2967G01F23/22G01F23/296
Inventor 多米尼克·费伦巴赫福尔克·奥尔盖耶霍尔格·格鲁尔格尔德·奥迈尔
Owner VEGA GRIESHABER GMBH & CO