Filter cake layer thickness measuring instrument and its measuring method

Abstract

The present invention discloses a device and a measuring method for measuring the thickness of a filter cake layer without opening the cover, which can ensure complete isolation between the inside and outside of the filter, and there are no electronic circuit devices inside the filter, being safe and reliable. It includes a filter pipe orifice setting, a fixing device, a manual push rod, and a movable measuring rod. The internal movable measuring rod and the external manual push rod move completely precisely and synchronously under the action of double-button magnetic suspension; when the induction magnet in the movable measuring rod contacts the filter element or the filter cake layer, a slight displacement occurs to change the magnetic field in the manual push rod, trigger the proximity switch in the manual push rod and make the indicator light emit light or go out, enabling the measurer to see whether the measuring rod contacts the filter element or the filter cake layer. And the thickness of the filter cake layer is measured in the way of a pointer indicating a scale.

Description

Technical Field

[0001] Measurement of the thickness of the filter cake layer in the chemical, mechanical, metallurgical, pharmaceutical, and food industries Background Art

[0002] In the current technology, either the filtration process needs to be interrupted to open the filter for measurement, or electronic circuit components or even motors need to be placed inside the filter and connected to the outside of the filter through wires, which is prone to leakage or leakage risks Summary of the Invention

[0003] The present invention includes mechanisms such as a filter pipe orifice structure, a fixing structure, a manual push rod, and a movable measuring rod (refer to the accompanying drawings of the specification); the filter pipe orifice structure includes a fixing mechanism including a connecting pipe flange 3, a pipe orifice 11, and a filter body. The fixing structure includes a port flange 1, an inner connecting pipe 2, and a fixed scale 7; the manual push rod structure includes a manual push rod 5, a pointer 6, a battery and an indicator light 10, a suspended magnet 13, and a proximity switch 15; the movable measuring rod includes a measuring rod 8, a suspended magnet 12, and an induction magnet 14. The fixing structure is welded, which completely isolates the inner and outer spaces of the filter and makes them not communicate with each other, achieving complete non-leakage. The filter pipe orifice must face the side of the filter element, and the length should also be able to completely receive the movable measuring rod inside the pipe orifice. The suspended magnet 13 on the manual push rod and the suspended magnet of the movable measuring rod form a double-button magnetic levitation structure, enabling the inner and outer structures of the filter to move precisely synchronously under the condition of complete isolation, and also making the movable measuring rod levitate on the inner connecting pipe 2, so that the synchronous movement does not creep, does not crawl, and does not lag. When the movable measuring rod moves and touches the fixed filter element or the filter cake layer, the induction magnet 14 on it will have a slight displacement, causing a change in the magnetic field inside the manual push rod. When the proximity switch senses it, an on / off action occurs, and the indicator light can also emit light or go out accordingly, enabling the measurer to see whether the measuring rod touches the filter element or the filter cake layer outside. There is a pointer 6 on the manual push rod indicating the scale on the scale 7, which can display the distance from the measuring rod to the filter cake layer at any time Detailed Description of the Invention

[0004] During installation, align the device with the front of the filter element. Before use, place the manual push rod at the outermost side of the filter. Before filtration, first determine the zero position: move the manual push rod towards the inside of the filter until the indicator light just lights up, move the pointer to the zero position of the scale, and then retract the manual push rod to the outermost side of the filter; after filtration, move the manual push rod towards the inside of the filter again until the indicator light just lights up, and the scale indicated by the pointer is the thickness of the filter cake layer Description of the Drawings

[0005] Figure 1The upper left figure is the external view, showing the external structure of the thickness gauge; the lower figure is the sectional view, showing the internal structure of the thickness gauge. In the figure, 1 is the port flange; 2 is the inner connecting pipe; 3 is the connecting pipe flange; 4 is the outer wall of the filter; 5 is the manual push rod; 6 is the pointer; 7 is the fixed measuring scale; 8 is the measuring rod; 9 is the filter element; 10 is the battery and the indicator light; 11 is the installation pipe orifice; 12 and 13 are the suspended magnets; 14 is the induction magnet; 15 is the proximity switch; 16 is the filter cake layer.

Claims

1. A filter cake layer thickness measuring instrument, characterized in that: It includes a filter nozzle structure, a fixing structure, a manual push rod structure, and a movable measuring rod; the filter nozzle structure includes a connecting pipe flange (3), a nozzle (11), and a filter body; the fixing structure includes a port flange (1), an inner connecting pipe (2), and a fixed scale (7); the manual push rod structure includes a manual push rod (5), a pointer (6), a battery, an indicator light (10), a floating magnet I (13), and a proximity switch (15); the movable measuring rod includes a measuring rod (8), a floating magnet II (12), and an induction magnet (14); the fixing structure is welded, which completely isolates the inner and outer spaces of the filter, making them not communicate with each other and achieving complete non-leakage; the floating magnet I (13) on the manual push rod (5) and the floating magnet II (12) of the movable measuring rod form a double-button magnetic levitation structure, enabling the inner and outer spaces of the filter to move precisely synchronously under the condition of complete isolation, and also making the movable measuring rod levitate on the inner connecting pipe (2), so that the synchronous movement does not creep, does not crawl, and does not lag; when the movable measuring rod moves and touches the filter cake layer, the induction magnet (14) on it will have a slight displacement, causing a change in the magnetic field inside the manual push rod (5), and the proximity switch (15) senses the on / off action, and the indicator light also lights up or goes out accordingly, enabling the measurer to see whether the measuring rod touches the filter cake layer outside; the pointer (6) on the manual push rod (5) indicates the scale on the scale (7), showing the distance from the measuring rod (8) to the filter cake layer; During installation, align the measuring instrument with the front of the filter element. Before use, place the manual push rod at the outermost side of the filter. Before filtration, first determine the zero position: move the manual push rod towards the inside of the filter until the indicator light just lights up, move the pointer to the zero position of the scale, and then retract the manual push rod to the outermost side of the filter; after filtration, move the manual push rod towards the inside of the filter again until the indicator light just lights up, and the scale indicated by the pointer is the thickness of the filter cake layer.

Images