JPH0320737Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a level detector used to detect the content of powder or liquid in a silo, tank, or the like.

More specifically, the vibration generated by applying a pulse current to an oscillation coil is transmitted to a diaphragm, and the time difference in vibration attenuation of the diaphragm is electrically detected depending on whether powder or liquid is in contact with the outer surface of the diaphragm. This invention relates to an improvement in the vibration detection mechanism of a level detector that detects the presence or absence of contents.

[Prior Art] Conventionally, in this type of level detector, as shown in FIGS. 1 and 2, an oscillation coil 3 is provided in close proximity to a suction iron piece 2 attached to a diaphragm 1. Vibration of the diaphragm 1 is detected by a vibration detection member 4 that is located laterally and fixed to the diaphragm 1.

[Problems to be solved by the invention] In the conventional level detector described above,
Even though the center part of the diaphragm 1 is where vibration is originally most pronounced, this part is occupied by the oscillating member composed of the suction iron piece 2 and the oscillation coil 3 or iron core 5 facing it, so the vibration The fixed position of the detection member 4 must inevitably be biased to the side, which is disadvantageous for vibration detection.

Therefore, it is difficult to detect extremely slight changes in vibration damping, and even if a sensitive vibration detection member is used, there is a limit naturally.

This is a major problem that hinders improvement in the performance of vibrating level detectors.

[Means for Solving the Problems] In view of the above, the present invention incorporates the vibration detecting member 4 within the oscillating member located at the center of the diaphragm 1, thereby increasing the distance to the center of the diaphragm 1. This makes it possible to relocate the fixed position, thereby improving the vibration detection function and, in turn, improving the performance of the diaphragm type level detector.

That is, in the present invention, in the diaphragm type level detector, the suction iron piece 2 is formed into a hollow box shape and is installed at the center of the diaphragm 1 facing the iron core 5 of the oscillation coil 3. The vibration detecting member 4 is housed in the diaphragm 1 and is fixed to the center of the diaphragm 1.

[Embodiment] An embodiment of the present invention will be explained with reference to FIGS. 3 and 4. First, a box-shaped hollow suction iron piece 2 is fixed inside the center part of the diaphragm 1, and is further fixed to the center of the hollow part. , a vibration detection member 4 is fixed.

The suction iron piece 2 has an iron core 5 surrounded by an oscillation coil 3.
are facing each other in close proximity.

In other words, the oscillating member and the detecting member are placed three-dimensionally in the center of the diaphragm 1, which has excellent conditions for both oscillating and detecting functions, whereas the conventional arrangement of the oscillating member in a flat plane on the diaphragm 1 has been preferentially arranged. By configuring this, the vibration detection function is improved without impairing the function of the conventional oscillation member.

[Effects of the invention] The diaphragm type level detector of the present invention with the above structure has significantly fewer malfunctions than those with the conventional structure, and its vibration detection function is significantly superior, resulting in highly reliable detection. Demonstrate performance.

In addition, since the operation is accurate and sharp, the performance burden on the subsequent electric circuit and its components is reduced.

As described above, the effect is not limited to mere improvement, but also extends to economic aspects such as reduction in manufacturing costs, so the industrial value of the present invention is great.

[Brief explanation of the drawing]

Figures 1 and 2 are a partial side sectional view and a front sectional view showing the structure of a conventional diaphragm level detector.
3 and 4 are a partial side sectional view and a front sectional view of the embodiment of the present invention. 1... Vibration plate, 2... Attraction iron piece, 3... Oscillation coil, 4... Vibration detection member, 5... Iron core, 6...
casing.

Claims (1)

[Scope of utility model registration request] In the diaphragm type level detector, a suction iron piece 2 is formed into a hollow box shape and is installed in the center of the diaphragm 1 facing the iron core 5 of the oscillation coil 3, and a vibration detection member is installed in the hollow part of the suction iron core 22. A vibration detection mechanism for a diaphragm type level detector, characterized in that a diaphragm 4 is housed and fixed to the center of a diaphragm 1.