CN100434879C - Differential force type magnetic suspension water level gauge - Google Patents

Abstract

The present invention relates to a differential force type magnetic levitation water level gauge which belongs to the technical field of water level measurement. The present invention comprises a containing cylinder, a measure hammer, inner magnetic steel, an inner magnetic steel sheath, a supporting frame, a tension transmitter, outer magnetic steel, an outer magnetic steel sheath and a water-level display secondary meter, wherein the containing cylinder is communicated with a boiler through two connecting pipes; the measure hammer is arranged in the containing cylinder; the inner magnetic steel is fixed on the upper end of the measure hammer through the inner magnetic steel sheath; the lower end of the supporting frame is fixed on the containing cylinder; the tension transmitter is fixed on the upper end of the supporting frame; the outer magnetic steel is connected with the measure end of the tension transmitter through the outer magnetic steel sheath; the measure hammer is caused to be stably suspended in the containing cylinder by the mutual effect between a magnetic field which is formed from the outer magnetic steel and a magnetic field which is formed form the inner magnetic steel; the signal output end of the tension transmitter is connected with the water-level display secondary meter. By using the tension transmitter to measure differences of reference gravity and buoyancy of the measure hammer, and the differences are converted to the electric quantity for measuring the water level. Results are continuous variable, and moreover, the accuracy is high.

Description

Differential force type magnetic suspension water level gauge

Technical field

The invention belongs to the level measuring technical field, relate to a kind of differential force type magnetic suspension water level gauge.

Background technology

At present had multiple measurement means in the fields of measurement of water level, for example: direct-reading water level gauge, differential pressure water level gauge, electric contact point fluviograph, magnetic float water level gauge etc. on the spot.Though these water level gauges all have characteristics separately, defective is separately also all arranged, for example on the spot water level gauge leak easily, the mica sheet fouling, have a strong impact on its display effect; Electric contact point fluviograph is to measure water level by electrode, and the setting of electrode is subjected to the restriction of quantity, and certain interval is arranged between each electrode, and measuring accuracy is reduced, and does not eliminate blind zone problem; The differential pressure water level gauge is measured water level by the reference level of water, can not put into operation immediately owing to form reference level when playing stove; The floating water level gauge of magnetic is measured water level by the position of measuring float, and float upwards floats under buoyancy must overcome gravity of self and the friction force between float and volumetric cylinder inwall, must bring the hysteresis problem, and measuring accuracy is reduced.

Summary of the invention

In order to overcome the defective that prior art exists, the present invention utilizes magnetic field force that the measurement hammer is suspended in the volumetric cylinder, difference by pulling force transmitter witness mark gravity and buoyancy also is converted into electric weight and measures water level, and purpose provides a kind of differential force type magnetic suspension water level gauge.

The present invention includes volumetric cylinder 1, measure hammer 2, interior magnet steel assembly 18, interior magnet steel sheath 3, support 5, pulling force transmitter 6, outer steel assembly 19, outer steel sheath 4, water level shows secondary instrument 7.Two connecting legs of the level up and down of volumetric cylinder 1 are connected to the bottom and the top of boiler-steam dome, and volumetric cylinder 1 is communicated with boiler-steam dome, and the top straight length of volumetric cylinder 1 and the bottom of volumetric cylinder 1 are adopted and be tightly connected.Measure hammer 2 and place volumetric cylinder 1, interior magnet steel assembly 18 places interior magnet steel sheath 3, and interior magnet steel sheath 3 is fixed in the upper end of measuring hammer 2, and is positioned at the top straight length of volumetric cylinder 1.Support 5 lower ends are fixed on the volumetric cylinder 1, and pulling force transmitter 6 is fixed in the upper end of support 5; Outer steel assembly 19 places in the outer steel sheath 4, and the upper end of outer steel sheath 4 links to each other with the measuring junction of pulling force transmitter 6, and outer steel sheath 4 covers on the outside of the top straight length of volumetric cylinder 1; Interaction between the magnetic field that magnetic field that outer steel assembly 19 forms and interior magnet steel assembly 18 form makes measures hammer 2 stable suspersions in volumetric cylinder 1.The signal output end of pulling force transmitter 6 shows that with water level secondary instrument 7 links to each other.

Connecting leg and the water in the boiler-steam dome that volumetric cylinder 1 interior water passes through volumetric cylinder 1 lower end are logical, and the gas on volumetric cylinder 1 top communicates with gas in the boiler-steam dome by the connecting leg on volumetric cylinder 1 top, guarantee that the water level in the volumetric cylinder 1 is interior consistent with pressure and boiler-steam dome.In the time of in measuring hammer 2 invasion waters, the value that pulling force transmitter 6 records is the difference of reference to gravitational and buoyancy, reference to gravitational is interior magnet steel assembly 18, interior magnet steel sheath 3, measure hammer 2 into shape, object gravity such as outer steel assembly 19, outer steel sheath 4 and.Water level in boiler-steam dome rises, and the water level in the volumetric cylinder 1 rises simultaneously, and water increases the buoyancy of measuring hammer 2, and the gravity value that this moment, pulling force transmitter 6 recorded diminishes, otherwise then increases.Pulling force transmitter 6 is converted to electric weight with the gravity value that records and is sent to water level demonstration secondary instrument 7, thereby realizes the measurement of water level.

The present invention measures the hammer stable suspersion in volumetric cylinder owing to utilize magnetic field force to make, by pulling force transmitter witness mark gravity with measure differing from and be converted into electric weight and measuring water level of the suffered buoyancy of hammer, measured value is continuous variable, the problem that does not also have friction force, thereby measure and hysteresis phenomenon can not occur, and precision height.The top straight length of volumetric cylinder and bottom are difficult for producing leakage phenomenon for being tightly connected.

Description of drawings

Fig. 1 is a structural representation of the present invention, also is the specification digest accompanying drawing.1 is volumetric cylinder among the figure, and 2 measure hammer, 18 interior magnet steel assemblys, magnet steel sheath in 3,5 supports, 6 pulling force transmitters, 19 outer steel assemblys, 4 outer steel sheaths, 7 water levels show secondary instrument, magnet steel post in 8 first, magnet steel post in 9 second, 10 the 3rd interior magnet steel posts, the 14A first annular isolation cover, the 14B second annular isolation cover, 14C the 3rd annular isolation cover, 15A Fourth Ring shape spacer sleeve, 15B five rings shape spacer sleeve, 15C the 6th annular isolation cover, 11 first outer steel rings, 12 second outer steel rings, 13 the 3rd outer steel rings, 16 sealing gaskets, 17 temperature transmitters.

Embodiment

The present invention adopts cylinder mode as shown in Figure 1, and the top straight length of volumetric cylinder 1 adopts the blue form that is connected of sending out with the bottom of volumetric cylinder 1, junction Gask-O-Seal 16 sealings.

Measuring hammer 2 is column, vertically places volumetric cylinder 1.Interior magnet steel assembly 18 comprises magnet steel post 8, second interior magnet steel post the 9, the 3rd interior magnet steel post 10 in first, the three is cylindrical, be stacked in the interior magnet steel sheath 3, and with first annular isolation cover 14A, second annular isolation cover 14B, 14C is spaced apart for the 3rd annular isolation cover, the lower end of interior magnet steel sheath 3 is welded in the upper end of measuring hammer 2.Support 5 lower ends are also adopted and are sent out form blue and link to each other with volumetric cylinder 1 straight length.The upper end of pulling force transmitter 6 is fixed by bolts on the support 5, and measuring junction links to each other with outer steel sheath 4 with coupling bolt.Outer steel assembly 19 comprises the first outer steel ring 11, the second outer steel ring 12, the 3rd outer steel ring 13, the three is an annular, be stacked in the outer steel sheath 4, separate with Fourth Ring shape spacer sleeve 15A, five rings shape spacer sleeve 15B, the 6th annular isolation cover 15C.Magnet steel post 8, second interior magnet steel post the 9, the 3rd interior magnet steel post 10 and the first outer steel ring 11, the second outer steel ring 12, the 3rd outer steel ring 13 adopt axial chargings in first.Magnet steel post 8 is identical with the first outer steel ring, 11 pole orientation in first, forms the magnetic field of repelling each other; Magnet steel post 9 and the second outer steel ring, 12 pole orientation are different in second, form the magnetic field of inhaling mutually.Magnet steel post 10 is identical with the 3rd outer steel ring 13 pole orientation in the 3rd, forms the magnetic field of repelling each other; The effect of three groups of magnetic field magnetic field forces makes measures hammer 2 stable suspersions in volumetric cylinder 1.First annular isolation cover 14A, second annular isolation cover 14B, the 3rd annular isolation cover 14C, Fourth Ring shape spacer sleeve 15A, five rings shape spacer sleeve 15B, the 6th annular isolation cover 15C adopt nonmagnetic substance, three groups of magnetic fields are separated, reduce influencing each other between each magnetic field.

The temperature sensor of temperature transmitter 17 is installed on the Drum Wall, the temperature signal of vapour and water partly is converted to electric weight by the transmitter of temperature transmitter in the boiler-steam dome that temperature sensor picks up, input to water level and show secondary instrument 7, proofread and correct the level measuring deviation that produces owing to variation of temperature, and then realize accurate measurement water level.

Claims (2)

1. a differential force type magnetic suspension water level gauge is characterized in that comprising volumetric cylinder (1), measures hammer (2), interior magnet steel assembly (18), interior magnet steel sheath (3), support (5), pulling force transmitter (6), outer steel assembly (19), outer steel sheath (4), water level shows secondary instrument (7); Two connecting legs of the level up and down of volumetric cylinder (1) are connected to the bottom and the top of boiler-steam dome, and volumetric cylinder (1) is communicated with boiler-steam dome, and the bottom of the top straight length of volumetric cylinder (1) and volumetric cylinder (1) is adopted and is tightly connected; Measure hammer (2) and place volumetric cylinder (1), interior magnet steel assembly (18) places interior magnet steel sheath (3), and interior magnet steel sheath (3) is fixed in the upper end of measuring hammer (2), and is positioned at the top straight length of volumetric cylinder (1); Support (5) lower end is fixed on the volumetric cylinder (1), and pulling force transmitter (6) is fixed in the upper end of support (5); Outer steel assembly (19) places in the outer steel sheath (4), and the upper end of outer steel sheath (4) links to each other with the measuring junction of pulling force transmitter (6), and outer steel sheath (4) covers on the outside of the top straight length of volumetric cylinder (1); The signal output end of pulling force transmitter (6) shows that with water level secondary instrument (7) links to each other.

2. according to the described differential force type magnetic suspension water level gauge of claim 1, it is characterized in that described interior magnet steel assembly (18) comprises magnet steel post (10) in magnet steel post (8) in first, the second interior magnet steel post (9), the 3rd, the three is cylindrical, in being stacked in the magnet steel sheath (3), and spaced apart with the first annular isolation cover (14A), the second annular isolation cover (14B), the 3rd annular isolation cover (14C); Outer steel assembly (19) comprises the first outer steel ring (11), the second outer steel ring (12), the 3rd outer steel ring (13), the three is an annular, be stacked in the outer steel sheath (4), spaced apart with Fourth Ring shape spacer sleeve (15A), five rings shape spacer sleeve (15B), the 6th annular isolation cover (15C); Magnet steel post (8), the second interior magnet steel post (9), the 3rd interior magnet steel post (10) and the first outer steel ring (11), the second outer steel ring (12), the 3rd outer steel ring (13) adopt axial charging in first; Magnet steel post (8) is identical with first outer steel ring (11) pole orientation in first, and the second interior magnet steel post (9) is different with second outer steel ring (12) pole orientation, and the 3rd interior magnet steel post (10) is identical with the 3rd outer steel ring (13) pole orientation.

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