CN210071860U - Immersed liquid metal rotating speed measuring device - Google Patents
Immersed liquid metal rotating speed measuring device Download PDFInfo
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- CN210071860U CN210071860U CN201920783932.6U CN201920783932U CN210071860U CN 210071860 U CN210071860 U CN 210071860U CN 201920783932 U CN201920783932 U CN 201920783932U CN 210071860 U CN210071860 U CN 210071860U
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- speed measuring
- liquid metal
- rotor
- measuring device
- shell
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- 229910001338 liquidmetal Inorganic materials 0.000 title claims abstract description 60
- 230000006698 induction Effects 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims description 14
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052733 gallium Inorganic materials 0.000 claims description 4
- 229910000846 In alloy Inorganic materials 0.000 claims description 3
- 229910001128 Sn alloy Inorganic materials 0.000 claims description 3
- RHZWSUVWRRXEJF-UHFFFAOYSA-N indium tin Chemical compound [In].[Sn] RHZWSUVWRRXEJF-UHFFFAOYSA-N 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 12
- 238000001514 detection method Methods 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model discloses an submergence formula liquid metal rotational speed measuring device, submergence formula liquid metal rotational speed measuring device includes: the device comprises a shell, a plurality of input electrodes arranged on the inner wall of the shell and a rotor positioned in the shell; an induction electrode is arranged on the rotor, liquid metal is filled between the shell and the rotor, and the liquid metal is used for connecting the induction electrode and the input electrode. Because when the induction electrode and the input electrode are opposite or not opposite, the current pulse size can be changed rapidly, the sensitivity of the rotating speed measuring device is greatly improved, the speed measuring detection efficiency is improved, and the test time is shortened.
Description
Technical Field
The utility model relates to a rotational speed measuring device technical field especially relates to an submergence formula liquid metal rotational speed measuring device.
Background
The commonly used rotating speed measuring devices include photoelectric type, capacitance type, variable reluctance type, tachogenerator and the like. In the prior art, the rotating speed is measured by directly transmitting the rotating state, but the sensitivity of measuring the rotating speed by directly transmitting the rotating state is poor.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide an submergence formula liquid metal rotational speed measuring device, aim at solving the relatively poor problem of rotational speed measuring device sensitivity among the prior art.
The utility model provides a technical scheme that technical problem adopted as follows:
an immersed liquid metal rotation speed measuring device, wherein, it includes: it includes: the device comprises a shell, a plurality of input electrodes arranged on the inner wall of the shell and a rotor positioned in the shell; the rotor can rotate in the shell, a plurality of input electrodes are arranged at intervals along the rotation direction of the rotor, induction electrodes are arranged on the rotor, and the induction electrodes are opposite to the input electrodes and have gaps with the input electrodes; liquid metal is filled between the shell and the rotor and used for connecting the induction electrode and the input electrode.
The immersed liquid metal rotating speed measuring device is characterized in that a shaft hole is formed in the shell, and a speed measuring shaft for driving the rotor to rotate is arranged in the shaft hole; one end of the speed measuring shaft is connected with the rotor, and the other end of the speed measuring shaft penetrates through the shaft hole and extends out of the shell.
The immersed liquid metal rotating speed measuring device is characterized in that a sealing ring is arranged on the edge of the shaft hole and surrounds the speed measuring shaft.
The immersed liquid metal rotating speed measuring device is characterized in that a groove is formed in the inner wall of the shell, and the sealing ring is located in the groove.
The immersed liquid metal rotating speed measuring device is characterized in that the speed measuring shaft is not conductive.
The immersed liquid metal rotating speed measuring device is characterized in that the speed measuring shaft is fixedly connected with the rotor through a key.
The immersed liquid metal rotating speed measuring device is characterized in that two baffles are arranged on the inner wall of the shell, and the two baffles are respectively positioned at two axial ends of the rotor.
The immersed liquid metal rotating speed measuring device is characterized in that the liquid metal is gallium-indium alloy or gallium-indium-tin alloy.
The immersed liquid metal rotating speed measuring device is characterized in that the width of the gap is 10-2000 mu m.
Has the advantages that: because when the induction electrode and the input electrode are opposite or not opposite, the current pulse size can be changed rapidly, the sensitivity of the rotating speed measuring device is greatly improved, the speed measuring detection efficiency is improved, and the test time is shortened.
Drawings
Fig. 1 is a cross-sectional view of the submerged liquid metal rotation speed measuring device of the present invention.
Fig. 2 is a cross-sectional view of the submerged liquid metal rotation speed measuring device of the present invention.
Fig. 3 is a schematic structural diagram of the middle base and the input electrode of the present invention.
Fig. 4 is a schematic structural view of the rotor of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1-4, the present invention provides some preferred embodiments of an immersion liquid metal rotation rate measuring device.
As shown in fig. 1 and 2, the immersed liquid metal rotation speed measuring device of the present invention comprises: the device comprises a shell 10, a plurality of input electrodes 30 arranged on the inner wall of the shell 10 and a rotor 20 positioned in the shell 10; a cavity for measuring speed is formed in the housing 10, the rotor 20 can rotate in the housing 10 (i.e. the cavity), the plurality of input electrodes 30 are arranged at intervals along the rotation direction of the rotor 20, the rotor 20 is provided with induction electrodes 21, and the induction electrodes 21 are opposite to the input electrodes 30 and have gaps with the input electrodes 30; liquid metal is filled between the housing 10 and the rotor 20, that is, liquid metal is filled in the cavity, and the rotor 20 is immersed in the liquid metal, and the liquid metal is used for connecting the induction electrode 21 and the input electrode 30.
It should be noted that the input electrode 30 is attached to the inner wall of the casing 10, and the input electrode 30 is externally connected to an input power terminal of the test circuit. The utility model discloses well rotational speed that needs to measure rotor 20. Because the liquid metal is conductive and the resistance of the liquid metal is related to the distance between the electrodes, for example, because the input electrodes 30 are arranged at intervals, when the rotor 20 drives the sensing electrode 21 to rotate to be opposite to the input electrodes 30, the distance between the sensing electrode 21 and the input electrodes 30, that is, the width of the gap, is relatively close, then the resistance of the liquid metal between the sensing electrode 21 and the input electrodes 30 is relatively small, and the current pulse sensed by the sensing electrode 21 is relatively large (denoted as the current pulse peak value). When the rotor 20 drives the sensing electrode 21 to rotate to a position between two input electrodes 30, the sensing electrode 21 is not opposite to the input electrodes 30, and the distance between the sensing electrode 21 and the input electrodes 30 is greater than the width of the gap, that is, relatively far, so that the resistance of the liquid metal between the sensing electrode 21 and the input electrodes 30 is relatively large, and the current pulse sensed by the sensing electrode 21 is relatively small (denoted as a current pulse valley value). The number of the induction electrodes 21 is one in the present embodiment, but may be plural.
The speed of the rotor 20 can be calculated by the speed of the current pulse change between the induction electrode 21 and the input electrode 30. Because the current pulse size can be changed rapidly when the induction electrode 21 and the input electrode 30 are opposite or not opposite, the sensitivity of the rotating speed measuring device is greatly improved, the speed measuring detection efficiency is improved, and the test time is shortened.
Furthermore, the utility model discloses well adoption liquid metal has good heat conductivity usually, and submergence formula liquid metal rotational speed measuring device has better heat dispersion.
For convenience of calculation, let the number of input electrodes 30 be n, the rotation speed of the rotor 20 can be calculated in various ways: first, when a sensing electrode 21 is provided, the time for detecting n current pulses of the sensing electrode 21 and the input electrode 30 is t1Second, the rotation speed of the rotor 20 is n/t1Revolutions per second. Secondly, when one sensing electrode 21 is provided, the time for detecting two adjacent current pulses of the sensing electrode 21 and the input electrode 30 is t2Second, the rotation speed of the rotor 20 is 1/t2Third, when two sensing electrodes 21 are provided, it is necessary to consider that the central angle of the pair of the two sensing electrodes 21 is α, and the time t for detecting that one of the input electrodes 30 sequentially faces the two sensing electrodes 21 is t3Second, the rotation speed of the rotor 20 is t3X 360 °/α rev/s.
Referring to fig. 1 and 2, in the preferred embodiment of the present invention, the rotor 20 is cylindrical, but may be disposed in a frustum shape.
The housing 10 includes: a base 11 and a cover 12 connected to the base 11; the base 11 is provided with a flange 13 and a bottom plate 14, the flange 13 is perpendicular to the bottom plate 14, and the bottom plate 14 is provided with a screw hole for a screw to pass through and fix the rotating speed measuring device.
In a preferred embodiment of the present invention, the housing 10 is provided with a shaft hole 111, the shaft hole 111 is disposed at the bottom of the base 11, and a speed measuring shaft for driving the rotor 20 to rotate is disposed in the shaft hole 111; one end of the speed measuring shaft is connected with the rotor, and the other end of the speed measuring shaft penetrates through the shaft hole 111 and extends out of the shell. The speed measuring shaft is used for being connected with a measured object, and the speed measuring shaft can be connected with the measured object through a coupler.
As shown in fig. 4, the rotor is provided with a through hole 201 for the speed measuring shaft to pass through, and the speed measuring shaft is fixedly connected with the rotor through a key 23. The key 23 is mainly used to prevent rotation between the tachometer shaft and the rotor. Specifically, be provided with first half groove 202 on the through-hole 201 inner wall, be provided with the half groove of second on the axle outer wall that tests the speed, first half groove 202 makes up into the keyway with the half groove of second, and key 23 is located the keyway. The rotor is connected with the speed measuring shaft through the key 23, so that the speed measuring shaft is convenient to replace, namely, the rotating shaft of the measured object can also be used as the speed measuring shaft and is connected with the rotor.
In a preferred embodiment of the present invention, the inner wall of the housing 10 is provided with a baffle 40, and the baffle 40 is divided into two parts, which are respectively located at two axial ends of the rotor 20. The baffle 40 is mainly used for adjusting the relative positions of the sensing electrode 21 and the input electrode 30, and ensuring that the sensing electrode 21 and the input electrode 30 are aligned without axial deviation. Specifically, the two baffles 40 are a shoulder baffle 41 and a shaft end baffle 42, respectively, the shoulder baffle 41 is annular and is sleeved on the speed measuring shaft, and the shaft end baffle 42 is located at the end of the speed measuring shaft and is circular.
In a preferred embodiment of the present invention, please refer to fig. 1, fig. 2 and fig. 3, in order to avoid the leakage of the liquid metal, the edge of the shaft hole 111 is provided with a sealing ring 50, the sealing ring 50 surrounds the speed measuring shaft, and of course, the sealing ring 50 is disposed on the inner wall of the housing 10. Further, a groove is provided on the inner wall of the housing 10, specifically, the groove is provided on the base 11; the sealing ring 50 is positioned in the groove, and the distance between the sealing ring 50 and the opening of the groove is 0.02-0.2 mm. The sealing ring 50 utilizes the rheological property of the liquid metal to form a sealing film with solid phase property at the sealing position so as to isolate the external environment and prevent the internal leakage of the rotating speed measuring device.
In a preferred embodiment of the invention, the width of the gap is 10-2000 μm. Preferably, the width of the gap is 100-800 μm. It is emphasized that the present fast measuring device has no special requirements for the width dimension of the gap, can be made with very little precision without any influence, and the width of the gap can be less than 100 μm under the conditions satisfied by the manufacturing process. Specifically, it is necessary to set the width of the gap according to the rotational speed measurement requirement, and the difference between the peak value of the current pulse and the valley value of the current pulse is sufficient to be detected in the time when the input electrode 30 is opposed to the sensing electrode 21. The higher the rotational speed that generally needs to be measured, the smaller the width of the gap; the width of the gap may be increased when the rotational speed to be measured is lower. Of course, the width of the gap also needs to be determined according to the sensing time, and when the sensing is required to be fast, the width of the gap is smaller, and when the sensing is not required to be fast, the width of the gap can be increased.
In a preferred embodiment of the present invention, the speed measuring shaft is non-conductive. Specifically, the speed measuring shaft is made of a non-conductive material so as to avoid influencing the conduction between the input electrode 30 and the sensing electrode 21; or, the speed measuring shaft is made of a conductive material, but the surface of the speed measuring shaft is plated with a lead layer. When the shaft diameter of the rotating shaft of the measured object is proper, the rotating shaft can be directly connected with the rotor 20 through the key 23 to measure the speed; when the shaft diameter of the measured shaft is smaller or thicker, the coupling is required to be connected to the speed measuring shaft.
The utility model has the advantages of it is following: (1) the liquid metal is adopted to conduct the induction electrode and the input electrode, so that the speed measurement detection efficiency is improved, the time is saved, the speed measurement detection efficiency is improved, and the test time is shortened. (2) The immersed liquid metal rotating speed measuring device has simple and compact structure, each part is relatively independent, and the maintenance and the overhaul are convenient; (3) the immersed liquid metal rotating speed measuring device has good interchangeability, and can realize modularization, serialization and rapid manufacture; (4) the immersed liquid metal rotating speed measuring device of the utility model has no special requirements on the working environment and can adapt to various special environments; (5) the utility model discloses utilize liquid metal self characteristic, can adapt to the rotational speed measurement under the high-speed rotatory situation. (6) The rotating speed measuring device has no special requirement on the length size of a speed measuring area, can be made very small, and the gap of the cavity of the rotating speed measuring device can be smaller than 100 mu m under the condition allowed by the technology.
The utility model also provides an immersion type liquid metal rotating speed measurement adopt following method manufacturing method, specifically include following step:
and S100, preparing liquid metal.
The liquid metal is selected in consideration of viscous resistance in its charged state, disturbance of resistance value, and wettability to the electrode material. According to the temperature condition of the use environment and the heat dissipation performance of the rotating speed measuring device, gallium indium alloy or gallium indium tin alloy manufactured in different proportions is selected, viscosity test is carried out under the condition of a test circuit, and meanwhile, when liquid metal is selected, the viscosity resistance in the charged state, the disturbance of the resistance value and the wettability of the liquid metal to an electrode material need to be considered.
Step S200 sets the position of the input electrode 30, the number of the input electrodes 30, and the width of the gap according to the rotation speed of the rotor 20.
Specifically, step S200 includes the steps of:
step S210, manufacturing a tachometer shaft, a key 23 and a rotor 20 with an induction electrode 21 according to the condition of the tachometer input end (such as the shaft diameter condition) and the requirement of rotating speed measurement.
Step S220, manufacturing 30 number N of input electrodes on the inner surface of the base 11 according to the size of the tachometer chamber and the requirement of measuring the rotation speed.
Step S230, manufacturing the base 11 according to the installation environment and the position size, obtaining the width of the gap through the inner diameter size of the base 11, installing the sensing electrode 21 on the inner surface of the base 11, and adjusting the relative position between the input electrode 30 on the inner surface of the base 11 and the sensing electrode 21 on the tachometer rotor through the thickness of the shaft shoulder baffle 41.
After sizing, preliminary static and dynamic balance calculations should be performed to balance the additional disturbances caused by uneven loading on the shaft.
Step S240, according to the test position of the input electrode 30 on the tachometer rotor corresponding to the sensing electrode 21, the key 23, the shoulder baffle 41, the shaft end baffle 42, and the tachometer rotor with the input electrode 30 are mounted on the tachometer shaft.
The symmetrical arrangement of the input electrodes 30 is usually adopted for the measurement of the uniform rotating speed, and the asymmetrical arrangement of the input electrodes 30 is often adopted according to the actual requirement when variable acceleration exists for the rotating speed, only partial rotating angle is concerned, or reciprocating rotation exists.
Step 250, manufacturing the cover body 12 according to the size of the base 11, sequentially installing the sealing ring 50, the rotor 20 and the speed measuring shaft 22 matched in the step 240 on the base 11, filling the prepared liquid metal into the cavity, installing the cover body 12 and testing the leakage-proof characteristic of the cover body 12.
And step S260, after initial assembly, carrying out an electrification test experiment to ensure the effectiveness of assembly.
To sum up, the utility model provides an submergence formula liquid metal rotational speed measuring device, submergence formula liquid metal rotational speed measuring device includes: the device comprises a shell, a plurality of input electrodes arranged on the inner wall of the shell and a rotor positioned in the shell; the rotor can rotate in the shell, a plurality of input electrodes are arranged at intervals along the rotation direction of the rotor, induction electrodes are arranged on the rotor, and the induction electrodes are opposite to the input electrodes and have gaps with the input electrodes; liquid metal is filled between the shell and the rotor and used for connecting the induction electrode and the input electrode. Because when the induction electrode and the input electrode are opposite or not opposite, the current pulse size can be changed rapidly, the sensitivity of the rotating speed measuring device is greatly improved, the speed measuring detection efficiency is improved, and the test time is shortened.
It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (9)
1. An immersed liquid metal rotation speed measuring device, characterized in that it includes: the device comprises a shell, a plurality of input electrodes arranged on the inner wall of the shell and a rotor positioned in the shell; the rotor can rotate in the shell, a plurality of input electrodes are arranged at intervals along the rotation direction of the rotor, induction electrodes are arranged on the rotor, and the induction electrodes are opposite to the input electrodes and have gaps with the input electrodes; liquid metal is filled between the shell and the rotor and used for connecting the induction electrode and the input electrode.
2. The immersed liquid metal rotating speed measuring device as claimed in claim 1, wherein a shaft hole is formed in the shell, and a speed measuring shaft for driving the rotor to rotate is arranged in the shaft hole; one end of the speed measuring shaft is connected with the rotor, and the other end of the speed measuring shaft penetrates through the shaft hole and extends out of the shell.
3. An immersed liquid metal rotation speed measuring device as claimed in claim 2, wherein the shaft hole edge is provided with a sealing ring, and the sealing ring surrounds the speed measuring shaft.
4. An immersed liquid metal rotation speed measuring device as claimed in claim 3, wherein the inner wall of the shell is provided with a groove, and the sealing ring is positioned in the groove.
5. An immersed liquid metal rotation speed measuring device according to claim 2, wherein the speed measuring shaft is non-conductive.
6. An immersed liquid metal rotation speed measuring device as claimed in claim 2, wherein the speed measuring shaft is fixedly connected with the rotor through a key.
7. An immersed liquid metal rotation speed measuring device as claimed in claim 1, wherein two baffles are arranged on the inner wall of the shell, and the two baffles are respectively positioned at two axial ends of the rotor.
8. An immersed liquid metal rotation speed measuring device according to claim 1, wherein the liquid metal is gallium indium alloy or gallium indium tin alloy.
9. An immersed liquid metal rotation speed measuring device according to claim 1, wherein the width of the gap is 10-2000 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920783932.6U CN210071860U (en) | 2019-05-28 | 2019-05-28 | Immersed liquid metal rotating speed measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920783932.6U CN210071860U (en) | 2019-05-28 | 2019-05-28 | Immersed liquid metal rotating speed measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN210071860U true CN210071860U (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920783932.6U Expired - Fee Related CN210071860U (en) | 2019-05-28 | 2019-05-28 | Immersed liquid metal rotating speed measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208566A (en) * | 2019-05-28 | 2019-09-06 | 南方科技大学 | A kind of immersion liquid metal rotation-speed measuring device and preparation method thereof |
-
2019
- 2019-05-28 CN CN201920783932.6U patent/CN210071860U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208566A (en) * | 2019-05-28 | 2019-09-06 | 南方科技大学 | A kind of immersion liquid metal rotation-speed measuring device and preparation method thereof |
| CN110208566B (en) * | 2019-05-28 | 2024-04-02 | 南方科技大学 | Immersed liquid metal rotating speed measuring device and manufacturing method thereof |
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Granted publication date: 20200214 |