CN113985332B - Magnetic liquid saturation magnetization intensity comparison device - Google Patents
Magnetic liquid saturation magnetization intensity comparison device Download PDFInfo
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- CN113985332B CN113985332B CN202111370317.0A CN202111370317A CN113985332B CN 113985332 B CN113985332 B CN 113985332B CN 202111370317 A CN202111370317 A CN 202111370317A CN 113985332 B CN113985332 B CN 113985332B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1215—Measuring magnetisation; Particular magnetometers therefor
Abstract
The invention discloses a magnetic liquid saturation magnetization intensity comparison device, and relates to the field of magnetic liquid performance comparison. The device comprises: left end cover, left indicator, sealing washer I, left cup, left nut, left floating block, left spring, axle, sealing washer II, solenoid, isolator, circlip, sealing washer III, sealing washer IV, right spring, right floating block, right nut, right cup, sealing washer V, right indicator, right end cover. The saturation magnetization intensity of the two magnetic liquids is compared through the first-order buoyancy principle of the magnetic liquids, so that the method is more accurate than a visual inspection method, and meanwhile, the dependence of a VSM method on expensive equipment is avoided.
Description
Technical Field
The invention relates to the field of magnetic liquid performance comparison, in particular to a magnetic liquid saturation magnetization comparing device.
Background
Saturation magnetization is an important measure of the performance of magnetic liquids, and in magnetic liquid applications, it is often necessary to compare the saturation magnetization of several magnetic liquids to select a satisfactory magnetic liquid. The current common saturation magnetization comparison method is a visual inspection method, namely, an equal amount of several magnetic liquids are placed in the magnetic field of a permanent magnet, and peak heights are observed to be higher, so that the higher the saturation magnetization of the magnetic liquid is, but the method has larger limitations, firstly, the magnetic liquids with different densities cannot be compared with the saturation magnetization by using the method due to the influence of the gravity of the magnetic liquid, and secondly, the problems of excessively small peak heights of the magnetic liquids, excessively small difference of peak orientations, inconsistent peak orientations and the like are possibly caused. Another comparison method is the VSM method commonly used in laboratories, which is to accurately calculate the saturation magnetization of a magnetic liquid by vibrating a sample magnetometer, but this method is not widely used because of the expensive equipment. It is known from the principle of first-order buoyancy of a magnetic liquid that the magnetic liquid is capable of suspending a non-magnetic object immersed therein under the action of an external magnetic field, and the magnitude of the generated buoyancy depends on the saturation magnetization of the magnetic liquid. According to the first-order buoyancy principle of the magnetic liquid, a magnetic liquid saturation magnetization comparing device is provided.
Disclosure of Invention
The invention aims to provide a simple, reliable and low-cost magnetic liquid saturation magnetization comparing device by utilizing the first-order buoyancy principle of magnetic liquid.
The technical scheme adopted by the invention is as follows:
the utility model provides a magnetic liquid saturation magnetization comparison device, includes left end cover (1), left indicator (2), sealing washer I (3), left cup (4), left nut (5), left floating block (6), left spring (7), axle (8), sealing washer II (9), solenoid (10), isolator (11), circlip (12), sealing washer III (13), sealing washer IV (14), right spring (15), right floating block (16), right nut (17), right cup (18), sealing washer V (19), right indicator (20), right end cover (21).
The connections between the parts making up the device: the sealing ring I (3) is arranged in a groove at the left end of the left cup body (4); the sealing ring II (9) is arranged in a groove at the right end of the left cup body (4); the sealing ring III (13) is arranged in a groove at the left end of the right cup body (18); the sealing ring IV (14) is arranged in a groove on the inner circular surface of the middle through hole of the isolation body (11); the sealing ring V (19) is arranged in a groove at the right end of the right cup body (18);
mounting the shaft (8) in a through hole in the middle of the isolating body (11); the left spring (7) is sleeved on the left half part of the shaft (8) and is fixed on the left end face of the isolating body (11); the right spring (15) is sleeved on the right half part of the shaft (8) and is fixed on the right end face of the isolating body (11); a left floating block (6) is fixed at the left end of the shaft (8) by a left nut (5); the right floating block (16) is fixed at the right end of the shaft (8) by a right nut (17); the left indicator (2) is glued in a groove at the left end face of the left floating block (6), and the right indicator (20) is glued in a groove at the right end face of the right floating block (16); the left spring (7) and the right spring (15) with the same specification are in a compressed state, so that the distance from the left floating block (6) to the isolating body (11) and the distance from the right floating block (16) to the isolating body (11) are the same;
the isolating body (11) with the shaft (8), the sealing ring IV (14), the left spring (7), the right spring (15), the left floating block (6), the right floating block (16), the left nut (5) and the right nut (17) is arranged in a step hole on the right side of the left cup body (4); the right cup body (18) is connected with the left cup body (4) through threads, the right cup body (18) is screwed into a step hole at the right end of the left cup body (4), and the isolating body (11) is pressed onto a step of the step hole;
sleeving the electromagnetic coil (10) on the right side of the left cup body (4), axially positioning the electromagnetic coil (10) through a shoulder and a circlip (12) on the right side of the left cup body (4), and ensuring that the horizontal distance from the left end face of the electromagnetic coil (10) to the left end face of the separator (11) is the same as the horizontal distance from the right end face of the electromagnetic coil (10) to the right end face of the separator (11);
the left end cover (1) and the left cup body (4) are connected by screw threads, and the right end cover (21) and the right cup body (18) are connected by screw threads.
Wherein, the left cup body (4) and the right cup body (18) are both made of transparent non-magnetic materials; the separator (11) is made of magnetic conductive material; the left floating block (6), the right floating block (16), the shaft (8), the left spring (7) and the right spring (15) are all made of non-magnetic materials; the cavity I (22) formed by surrounding the left end cover (1), the left cup body (4) and the isolating body (11) is the same as the cavity II (23) formed by surrounding the right end cover (21), the right cup body (18) and the isolating body (11) in inner diameter and volume.
The working principle and the using method of the device are as follows: filling the cavity I (22) with a magnetic liquid, and screwing the left end cover (1) into the left cup body (4); filling the cavity II (23) with another magnetic liquid, and screwing the right end cover (21) into the right cup body (18); the device is horizontally placed to eliminate the influence of gravity, the left indicator (2) is found through the transparent left cup body (4) and the position of the left indicator (2) is marked on the left cup body (4), or the right indicator (20) is found through the transparent right cup body (18) and the position of the right indicator (20) is marked on the right cup body (18); the electromagnetic coil (10) is electrified with direct current, and after the magnetic conductive isolator (11) in the electromagnetic coil (10) is magnetized, magnetic fields with opposite magnetic poles and the same magnetic field strength are generated on the left end surface and the right end surface; according to the first-order buoyancy principle of the magnetic liquid, the left floating block (6) receives leftward thrust from the magnetic liquid, the right floating block (16) receives rightward thrust from the magnetic liquid, and if a difference exists between the two thrust, the shaft (8) moves leftwards or rightwards; by observing the direction of the left indicator (2) or the right indicator (20) deviating from the initial mark position, the saturation magnetization of the two magnetic liquids can be compared; whether the position of the left indicator (2) or the position of the right indicator (20) is initially marked, it is indicated that the saturation magnetization of the magnetic liquid in the left-hand cavity I (22) is greater as long as the indicator deviates to the left from the marked position, whereas it is indicated that the saturation magnetization of the magnetic liquid in the right-hand cavity II (23) is greater, and that the accuracy of the device is insufficient to compare the saturation magnetization of the two magnetic liquids if no macroscopic movement of the indicator occurs.
Compared with the prior common visual inspection method and the common VSM method in the laboratory, the device has the beneficial effects that: 1. the horizontally placed experimental device avoids the influence of gravity on the comparison result, and can be used for comparing the saturation magnetization intensity of the magnetic liquids with different densities; 2. the saturation magnetization intensity of the two magnetic liquids is converted into first-order buoyancy of the two magnetic liquids, the difference of the first-order buoyancy of the two magnetic liquids is reflected through the offset direction of the indicator, and the problems of excessively small peak of the magnetic liquids, excessively small peak height difference, inconsistent peak orientation and the like in a visual inspection method are avoided; 3. simple construction and low cost, and does not require the expensive equipment required by the VSM method.
Drawings
FIG. 1 is a schematic diagram of a magnetic liquid saturation magnetization comparison device according to the present invention;
in fig. 1: left end cover (1), left indicator (2), sealing washer I (3), left cup (4), left nut (5), left floating block (6), left spring (7), axle (8), sealing washer II (9), solenoid (10), isolator (11), circlip (12), sealing washer III (13), sealing washer IV (14), right spring (15), right floating block (16), right nut (17), right cup (18), sealing washer V (19), right indicator (20), right end cover (21), cavity I (22), cavity II (23).
Detailed Description
The present invention will be further described with reference to the drawings, wherein the terms "left" and "right" representing the orientation are used for convenience of description, and are merely meant to be consistent with the left and right directions of the drawings, and are not intended to limit the structure.
A magnetic liquid saturation magnetization comparison device is shown in fig. 1, the device comprising: left end cover (1), left indicator (2), sealing washer I (3), left cup (4), left nut (5), left floating block (6), left spring (7), axle (8), sealing washer II (9), solenoid (10), isolator (11), circlip (12), sealing washer III (13), sealing washer IV (14), right spring (15), right floating block (16), right nut (17), right cup (18), sealing washer V (19), right indicator (20), right-hand member lid (21).
The connections between the parts making up the device: the sealing ring I (3) is arranged in a groove at the left end of the left cup body (4); the sealing ring II (9) is arranged in a groove at the right end of the left cup body (4); the sealing ring III (13) is arranged in a groove at the left end of the right cup body (18); the sealing ring IV (14) is arranged in a groove on the inner circular surface of the middle through hole of the isolation body (11); the sealing ring V (19) is arranged in a groove at the right end of the right cup body (18);
mounting the shaft (8) in a through hole in the middle of the isolating body (11); the left spring (7) is sleeved on the left half part of the shaft (8) and is fixed on the left end face of the isolating body (11); the right spring (15) is sleeved on the right half part of the shaft (8) and is fixed on the right end face of the isolating body (11); a left floating block (6) is fixed at the left end of the shaft (8) by a left nut (5); the right floating block (16) is fixed at the right end of the shaft (8) by a right nut (17); the left indicator (2) is glued in a groove at the left end face of the left floating block (6), and the right indicator (20) is glued in a groove at the right end face of the right floating block (16); the left spring (7) and the right spring (15) with the same specification are in a compressed state, so that the distance from the left floating block (6) to the isolating body (11) and the distance from the right floating block (16) to the isolating body (11) are the same;
the isolating body (11) with the shaft (8), the sealing ring IV (14), the left spring (7), the right spring (15), the left floating block (6), the right floating block (16), the left nut (5) and the right nut (17) is arranged in a step hole on the right side of the left cup body (4); the right cup body (18) is connected with the left cup body (4) through threads, the right cup body (18) is screwed into a step hole at the right end of the left cup body (4), and the isolating body (11) is pressed onto a step of the step hole;
sleeving the electromagnetic coil (10) on the right side of the left cup body (4), axially positioning the electromagnetic coil (10) through a shoulder and a circlip (12) on the right side of the left cup body (4), and ensuring that the horizontal distance from the left end face of the electromagnetic coil (10) to the left end face of the separator (11) is the same as the horizontal distance from the right end face of the electromagnetic coil (10) to the right end face of the separator (11);
the left end cover (1) and the left cup body (4) are connected by screw threads, and the right end cover (21) and the right cup body (18) are connected by screw threads.
The cavity I (22) formed by surrounding the left end cover (1), the left cup body (4) and the isolating body (11) is the same as the cavity II (23) formed by surrounding the right end cover (21), the right cup body (18) and the isolating body (11) in inner diameter and volume.
The left cup body (4) and the right cup body (18) are made of polymethyl methacrylate;
the material of the separator (11) is 2Cr13 with good magnetic permeability;
the left floating block (6), the right floating block (16) and the shaft (8) are made of aluminum;
the left spring (7) and the right spring (15) are made of non-magnetic materials.
Claims (3)
1. A magnetic liquid saturation magnetization comparing device, the device comprising: the left end cover (1), the left indicator (2), the sealing ring I (3), the left cup body (4), the left nut (5), the left floating block (6), the left spring (7), the shaft (8), the sealing ring II (9), the electromagnetic coil (10), the isolator (11), the circlip (12), the sealing ring III (13), the sealing ring IV (14), the right spring (15), the right floating block (16), the right nut (17), the right cup body (18), the sealing ring V (19), the right indicator (20) and the right end cover (21);
the connections between the parts making up the device: the sealing ring I (3) is arranged in a groove at the left end of the left cup body (4); the sealing ring II (9) is arranged in a groove at the right end of the left cup body (4); the sealing ring III (13) is arranged in a groove at the left end of the right cup body (18); the sealing ring IV (14) is arranged in a groove on the inner circular surface of the middle through hole of the isolation body (11); the sealing ring V (19) is arranged in a groove at the right end of the right cup body (18);
mounting the shaft (8) in a through hole in the middle of the isolating body (11); the left spring (7) is sleeved on the left half part of the shaft (8) and is fixed on the left end face of the isolating body (11); the right spring (15) is sleeved on the right half part of the shaft (8) and is fixed on the right end face of the isolating body (11); a left floating block (6) is fixed at the left end of the shaft (8) by a left nut (5); the right floating block (16) is fixed at the right end of the shaft (8) by a right nut (17); the left indicator (2) is glued in a groove at the left end face of the left floating block (6), and the right indicator (20) is glued in a groove at the right end face of the right floating block (16); the left spring (7) and the right spring (15) with the same specification are in a compressed state, so that the distance from the left floating block (6) to the isolating body (11) and the distance from the right floating block (16) to the isolating body (11) are the same;
the isolating body (11) with the shaft (8), the sealing ring IV (14), the left spring (7), the right spring (15), the left floating block (6), the right floating block (16), the left nut (5) and the right nut (17) is arranged in a step hole on the right side of the left cup body (4); the right cup body (18) is connected with the left cup body (4) through threads, the right cup body (18) is screwed into a step hole at the right end of the left cup body (4), and the isolating body (11) is pressed onto a step of the step hole;
sleeving the electromagnetic coil (10) on the right side of the left cup body (4), axially positioning the electromagnetic coil (10) through a shoulder and a circlip (12) on the right side of the left cup body (4), and ensuring that the horizontal distance from the left end face of the electromagnetic coil (10) to the left end face of the separator (11) is the same as the horizontal distance from the right end face of the electromagnetic coil (10) to the right end face of the separator (11);
the left end cover (1) and the left cup body (4) are connected by screw threads, and the right end cover (21) and the right cup body (18) are connected by screw threads.
2. A magnetic liquid saturation magnetization comparing device according to claim 1, wherein:
the left cup body (4) and the right cup body (18) are made of transparent non-magnetic materials; the separator (11) is made of magnetic conductive material; the left floating block (6), the right floating block (16), the shaft (8), the left spring (7) and the right spring (15) are all made of non-magnetic materials.
3. A magnetic liquid saturation magnetization comparing device according to claim 1, wherein:
the cavity I (22) formed by surrounding the left end cover (1), the left cup body (4) and the isolating body (11) is the same as the cavity II (23) formed by surrounding the right end cover (21), the right cup body (18) and the isolating body (11) in inner diameter and volume.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111370317.0A CN113985332B (en) | 2021-11-18 | 2021-11-18 | Magnetic liquid saturation magnetization intensity comparison device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111370317.0A CN113985332B (en) | 2021-11-18 | 2021-11-18 | Magnetic liquid saturation magnetization intensity comparison device |
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| CN113985332A CN113985332A (en) | 2022-01-28 |
| CN113985332B true CN113985332B (en) | 2023-06-09 |
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| CN203299362U (en) * | 2013-06-24 | 2013-11-20 | 上海大学 | Saturation magnetization intensity measuring device |
| CN103675342A (en) * | 2013-12-26 | 2014-03-26 | 北京交通大学 | Novel range-adjustable magnetic liquid acceleration sensor |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122157B (en) * | 2019-11-26 | 2020-12-18 | 燕山大学 | Magnetic-liquid double-suspension bearing experiment table |
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2021
- 2021-11-18 CN CN202111370317.0A patent/CN113985332B/en active Active
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| CN203299362U (en) * | 2013-06-24 | 2013-11-20 | 上海大学 | Saturation magnetization intensity measuring device |
| CN103675342A (en) * | 2013-12-26 | 2014-03-26 | 北京交通大学 | Novel range-adjustable magnetic liquid acceleration sensor |
| CN103675351A (en) * | 2013-12-26 | 2014-03-26 | 北京交通大学 | Novel inductive magnetic liquid acceleration sensor |
| CN103759932A (en) * | 2014-01-17 | 2014-04-30 | 北京交通大学 | Magnetic liquid sealing pressure-bearing mechanism experimental research device |
| CN104316717A (en) * | 2014-11-17 | 2015-01-28 | 吉林大学 | Voltage transformation type speed measurement device for magnetic liquid |
| CN104931726A (en) * | 2015-06-25 | 2015-09-23 | 北京交通大学 | Piston-type first-order buoyancy magnetic liquid inertial sensor |
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