CN209946190U - Flange type liquid metal rotation speed sensor - Google Patents
Flange type liquid metal rotation speed sensor Download PDFInfo
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- CN209946190U CN209946190U CN201920783928.XU CN201920783928U CN209946190U CN 209946190 U CN209946190 U CN 209946190U CN 201920783928 U CN201920783928 U CN 201920783928U CN 209946190 U CN209946190 U CN 209946190U
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- 229910001338 liquidmetal Inorganic materials 0.000 title claims abstract description 91
- 238000007789 sealing Methods 0.000 claims abstract description 84
- 230000006698 induction Effects 0.000 claims abstract description 39
- 238000005259 measurement Methods 0.000 claims description 14
- 238000012360 testing method Methods 0.000 description 5
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 229910052733 gallium Inorganic materials 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 229910000846 In alloy Inorganic materials 0.000 description 2
- 229910001128 Sn alloy Inorganic materials 0.000 description 2
- 230000004323 axial length Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- RHZWSUVWRRXEJF-UHFFFAOYSA-N indium tin Chemical compound [In].[Sn] RHZWSUVWRRXEJF-UHFFFAOYSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The utility model discloses a flange type liquid metal rotation speed sensor, which comprises an insulated shell shaft cylinder, a speed measuring rotor, a sealing end cover and a flange sealing end cover; the shell shaft tube is sleeved on the speed measuring rotor, the sealing end cover and the flange sealing end cover are respectively fixed at two axially opposite ends of the shell shaft tube and the speed measuring rotor to form a sealed speed measuring cavity, and liquid metal is stored in the speed measuring cavity; the shell shaft cylinder is provided with an induction electrode, and the speed measuring rotor is provided with an input electrode; the induction electrode and the input electrode are immersed in the liquid metal and are respectively connected with the same speed measuring circuit; when the speed is measured, the current flows into the liquid metal through the input electrode, and when the input electrode and the induction electrode face to each other in the same direction, a current pulse signal is output to the speed measuring circuit through the induction electrode. And further effectively improves the safety and stability of the flange type liquid metal rotating speed sensor.
Description
Technical Field
The utility model relates to a rotational speed measuring device field especially relates to a flange formula liquid metal revolution speed sensor.
Background
A rotation speed sensor is a sensor that converts the rotation speed of a rotating object into an electrical output. The prior art mainly measures the rotating speed by directly transmitting the rotating state, but the form causes a certain amount of load and resistance to a speed measuring shaft generated by a speed measuring sensor, and the phenomenon is particularly obvious in an electromechanical system. In addition, the bearing bush of the internal sensor is easy to generate heat when continuously rubbed in an electrified state, and even can generate electric sparks after being worn, so that the performance of the electric connector is seriously influenced, and dangerous accidents are caused.
Therefore, the prior art has defects and needs 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 among the prior art, provide a flange formula liquid metal revolution speed sensor, aim at solving the problem of prior art revolution speed sensor poor stability.
The utility model provides a technical scheme that technical problem adopted as follows: a flange-style liquid metal rotational speed sensor for measuring rotational speed of an object, comprising:
the device comprises an insulated shell shaft cylinder, a speed measuring rotor, a sealing end cover and a flange sealing end cover;
the shell shaft tube is sleeved on the speed measuring rotor, the sealing end cover and the flange sealing end cover are respectively fixed at two axially opposite ends of the shell shaft tube and the speed measuring rotor to form a sealed speed measuring cavity, and liquid metal is stored in the speed measuring cavity;
the shell shaft cylinder is provided with an induction electrode, and the speed measuring rotor is provided with an input electrode; the induction electrode and the input electrode are immersed in liquid metal and are respectively connected with the same speed measuring circuit;
when the speed measurement is carried out, current flows into the liquid metal through the input electrode, and when the input electrode and the induction electrode face to each other in the same direction, a current pulse signal is output to the speed measurement circuit through the induction electrode.
Further, the speed measuring rotor is connected with a rotating shaft in an adaptive mode; the rotating shaft is set as a rotating speed output shaft or a speed measuring shaft connected with the rotating speed output shaft through a coupler.
Furthermore, the tachometer rotor is arranged in a hollow cylindrical shape and comprises a rotor inner surface deviating from the shell shaft barrel, and one end of the rotating shaft is fixed in the rotor inner surface of the tachometer rotor.
Furthermore, the flange type liquid metal revolution speed sensor further comprises a key, wherein a sliding key groove is formed in the inner surface of one end, close to the sealing end cover, of the speed measuring rotor, and the key is arranged in the sliding key groove in a sliding mode and used for fixing a rotating shaft on the inner surface of the rotor.
Further, the housing shaft comprises a sleeve inner surface close to the tachometer rotor, and the tachometer rotor also comprises a rotor outer surface close to the housing shaft; the induction electrode is arranged on the inner surface of the sleeve, the input electrode is arranged on the outer surface of the rotor, and the induction electrode and the input electrode are arranged on the same surface.
Furthermore, the flange sealing end cover faces to a flange plate of the rotor, and the flange plate is used for axially mounting the shell shaft barrel, the speed measuring rotor and the rotating shaft.
Furthermore, a first sealing groove surrounding the rotating shaft is formed in the flange sealing end cover and the surface, facing the speed measuring rotor, of the sealing end cover; a first sealing gasket is arranged in the first sealing groove.
Furthermore, the flange sealing end cover and the surface of the sealing end cover facing the speed measuring rotor are provided with sealing adjusting rings surrounding the rotating shaft.
Furthermore, a second sealing groove surrounding the rotating shaft is formed in the surfaces, facing the shell shaft cylinder, of the flange sealing end cover and the sealing end cover; and a second sealing gasket is arranged in the second sealing groove.
Further, the flange-type liquid metal rotation speed sensor according to any one of the above claims, wherein the number of the sensing electrodes is one, and the number of the input electrodes is one or more.
Compared with the prior art, the utility model provides a flange type liquid metal rotation speed sensor; the flange-type liquid metal rotation speed sensor comprises: the device comprises an insulated shell shaft cylinder, a speed measuring rotor, a sealing end cover and a flange sealing end cover; the shell shaft tube is sleeved on the speed measuring rotor, the sealing end cover and the flange sealing end cover are respectively fixed at two axially opposite ends of the shell shaft tube and the speed measuring rotor to form a sealed speed measuring cavity, and liquid metal is stored in the speed measuring cavity; the shell shaft cylinder is provided with an induction electrode, and the speed measuring rotor is provided with an input electrode; the induction electrode and the input electrode are immersed in liquid metal and are respectively connected with the same speed measuring circuit; when the speed measurement is carried out, the current flows into the liquid metal through the input electrode, and when the input electrode and the induction electrode face to each other in the same direction, a current pulse signal is output to the speed measurement circuit through the induction electrode. Thereby effectively avoiding the load generated on the flange type liquid metal rotating speed sensor and improving the safety and the stability of the flange type liquid metal rotating speed sensor.
Drawings
Fig. 1 is a schematic perspective view of a flange-type liquid metal rotation speed sensor according to the present invention.
Fig. 2 is a schematic view of a partial cross-sectional three-dimensional view of a middle flange type liquid metal rotation speed sensor according to the present invention.
Fig. 3 is a schematic side view of the middle flange type liquid metal rotation speed sensor of the present invention.
FIG. 4 is a schematic view in partial section taken along line I-I in FIG. 3.
Fig. 5 is a schematic view of the three-dimensional partial section of the matching relationship between the speed measuring rotor and the sealing adjusting ring of the middle flange type liquid metal revolution speed sensor of the present invention.
Fig. 6 is the three-dimensional partial section schematic diagram of the matching relationship between the speed measuring shaft, the speed measuring rotor and the sealing adjusting ring of the middle flange type liquid metal revolution speed sensor of the utility model.
Fig. 7 is a perspective view of the speed measuring shaft of the middle flange type liquid metal revolution speed sensor of the present invention.
Fig. 8 is another schematic perspective partial cross-sectional view of a middle flange type liquid metal rotation speed sensor according to the present invention.
Description of reference numerals:
10. a flange-type liquid metal rotation speed sensor; 11. a housing shaft; 12. a speed measuring rotor; 13. sealing the end cap; 14. sealing the end cover by the flange; 15. a speed measuring cavity; 16. a speed measuring shaft; 18. a seal adjusting ring; 111. an induction electrode; 112. the inner surface of the shaft barrel; 121. an input electrode; 122. an inner surface of the rotor; 123. an outer surface of the rotor; 124. a key; 125. a feather key groove; 141. a flange plate; 171. a first seal groove; 172. a second seal groove; 173. a first seal.
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 and 2, the present invention provides a flange type liquid metal rotation speed sensor 10 for measuring the rotation speed of an object, the flange type liquid metal rotation speed sensor 10 includes a housing shaft tube 11, a speed measuring rotor 12, a seal end cover 13 and a flange seal end cover 14, and the housing shaft tube 11, the speed measuring rotor 12, the seal end cover 13 and the flange seal end cover 14 are all insulators. The speed measuring rotor 12 is sleeved with the housing shaft tube 11, the sealing end covers 13 and the flange sealing end covers 14 are respectively fixed to two axially opposite ends of the housing shaft tube 11 and the speed measuring rotor 12 to form a sealed speed measuring cavity 15, and liquid metal (not shown) is stored in the speed measuring cavity 15. Further, the liquid metal comprises gallium indium alloy or gallium indium tin alloy; it can be understood that the axial length of the tachometer rotor 12 is less than or equal to the axial length of the housing shaft 11; namely, the two axial opposite ends of the housing shaft tube 11 and the tachometer rotor 12 are flush, or the two axial ends of the tachometer rotor 12 are recessed relative to the housing shaft tube 11.
With further reference to fig. 3 and fig. 4, the housing shaft 11 is provided with an induction electrode 111, and the tachometer rotor 12 is provided with an input electrode 121; specifically, the surface of the housing shaft tube 11 facing the speed measuring cavity 15 is provided with an induction electrode 111, and the surface of the speed measuring rotor 12 facing the speed measuring cavity 15 is provided with an input electrode 121; that is, the surface of the housing shaft tube 11 close to the tachometer rotor 12 is provided with an induction electrode 111, and the surface of the tachometer rotor 12 close to the housing shaft tube 11 is provided with an input electrode 121.
Further, the sensing electrode 111 and the input electrode 121 are immersed in the liquid metal and are respectively connected to the same tachometer circuit. It can be understood, sensing electrode 111 and input electrode 121 dip simultaneously the liquid metal, and connect respectively speed measuring circuit's both ends work as sensing electrode 111 with when input electrode 121 distributes with the radial, the liquid metal electric conductance is expert sensing electrode 111 and input electrode 121, promptly the speed measuring circuit is expert in to the liquid metal electric conductance, and what need emphasize, speed measuring circuit is current design, and its mainly used detects the electric current that is interrupted, is used for detecting current pulse signal promptly, and is not about concrete design the utility model discloses a point, the utility model discloses only be used for using, no longer describe herein repeatedly.
Further, when the speed measurement is performed, the current flows into the liquid metal through the input electrode 121, and when the input electrode 121 and the sensing electrode 111 face each other in the same direction, the current passes through the sensing electrode 111, and then a current pulse signal is output to the speed measurement circuit. That is, the current enters the liquid metal through the input electrode 121, and if and only if the input electrode 121 and the sensing electrode 111 face each other in the same direction, the current enters the sensing electrode 111 from the liquid metal, so that the tachometer circuit is turned on, and a current pulse signal is detected. The rotating speed of the measured object of the object to be measured can be accurately measured by the flange type liquid metal rotating speed sensor under the condition of no load, and the stability and the safety of the flange type liquid metal rotating speed sensor are obviously improved; meanwhile, the response speed of the flange type liquid metal rotating speed sensor is also obviously improved.
Referring to fig. 5 and 6, the tachometer rotor 12 is adapted to be connected to a rotating shaft; the rotating shaft is set as a rotating speed output shaft or a speed measuring shaft 16 connected with the rotating speed output shaft through a coupler; it will be appreciated that the tachometer rotor 12 may be directly connected to the tachometer shaft, or alternatively, the tachometer rotor 12 may be directly connected to the tachometer shaft 16, and then the tachometer shaft 16 is fixedly connected to the tachometer shaft via a coupling.
Further, the tachometer rotor 12 is configured as a hollow cylinder having an inner diameter; the tachometer rotor 12 can be directly connected to the tachometer shaft. It should be noted that, when the rotating speed output shaft is nonmagnetic and the shaft diameter is matched with the inner diameter of the rotor; namely, when the shaft diameter of the rotating speed output shaft is matched with the inner diameter of the rotor, the rotating speed output shaft can be directly connected with the rotor.
Further, the tachometer shaft 16 is fixed on the tachometer rotor 12, and the other end thereof is fixedly connected with the rotating speed output shaft through a coupling (not shown); it can be understood that the shaft diameter of the rotating speed output shaft at this time can be smaller or larger than the inner diameter of the rotor, and the rotating speed output shaft also can have certain weak magnetism; it should be noted that, when the rotational speed output shaft is nonmagnetic and the shaft diameter is adapted to the inner diameter of the speed measuring rotor 12, the speed measuring shaft 16 may also be connected through a coupling, so as to realize the synchronous rotation of the speed measuring rotor 12 and the rotational speed output shaft. It should be noted that the speed measuring rotor 12 is not externally connected with other loads, so that friction heating inside the flange type liquid metal rotation speed sensor is effectively avoided, and the stability and the safety are improved.
That is to say, the speed measuring rotor in the present invention includes two cases when being adapted to the rotating shaft, and in any way, the adaptation relationship between the rotor and the rotating shaft is the same, and the rotating shaft in the following embodiments of the present invention is described only by setting the rotating shaft as the speed measuring shaft 16, but it should be noted that when the rotating shaft is set as the rotating speed output shaft, it is also the same as the rotating shaft as the speed measuring shaft 16, and details are not repeated again; furthermore, the matching relationship between the flange type liquid metal rotation speed sensor 10 and the rotating shaft, except for the tachometer rotor 12, is also described by the tachometer shaft 16; when the rotating shaft is set as a rotating speed output shaft, and when the rotating shaft is set as a rotating speed output shaft, the matching relationship between the rotating shaft and other components of the flange-type liquid metal rotating speed sensor 10 except the tachometer rotor 12 is also the same as that when the rotating shaft is set as the tachometer shaft 16, which is not described again.
With further reference to fig. 7, further, the tachometer rotor 12 includes a rotor inner surface 122 facing away from the housing shaft 11, and a rotor outer surface 123 adjacent to the housing shaft 11; one end of the rotating shaft is fixed in the inner surface 122 of the tachometer rotor 12, that is, one end of the tachometer shaft 16 or the rotational speed output shaft is fixed in the inner surface 122 of the tachometer rotor 12; the input electrode 121 is disposed on the rotor outer surface 123. Meanwhile, the outer casing shaft tube 11 comprises a shaft tube inner surface 112 close to the tachometer rotor 12, and the induction electrode 111 is arranged on the shaft tube inner surface 112. It should be noted that, in the present invention, the number of the sensing electrodes 111 is set to be one, and the number of the input electrodes 121 may be set to be one or more; meanwhile, the sensing electrode 111 and the input electrode 121 are disposed on the same plane, that is, the sensing electrode 111 and the input electrode 121 are distributed on the same radial section of the tachometer rotor 12 and the housing shaft 11. Thus ensuring that each input electrode 121 rotates with the tachometer rotor 12 once, it is distributed in the same radial direction as the induction electrode 111.
Meanwhile, the liquid metal also has a certain resistance, and when the tachometer rotor 12 rotates, the liquid metal also rotates along with the liquid metal, so that the resistance of the liquid metal is further increased; this results in the input electrode 121 and the sensing electrode 111 being at a greater distance, although immersed in the liquid metal at the same time, but not electrically conductive; it can be understood that the distance between the sensing electrode 111 and the input electrode 121 is the smallest if and only if the input electrode 121 and the sensing electrode 111 are distributed in the same radial direction, and the current in the input electrode 121 just can enter the sensing electrode 111 through the liquid metal, so as to generate a current pulse signal.
Preferably, the flange-type liquid metal revolution speed sensor further includes a key 124, a sliding key groove 125 is formed on an inner surface of one end of the tachometer rotor 12 close to the end cover 13, and the key 124 is slidably disposed in the sliding key groove 125 and is used for fixing a rotating shaft on the rotor inner surface 122, that is, the tachometer shaft 16 or the revolution speed output shaft on the rotor inner surface 122. It will be appreciated that the key 124 is free to slide within the keyway 125, thereby facilitating the mounting and fixing of the tachometer shaft 16 or rotary output shaft to the tachometer rotor 12.
Further, a flange 141 facing the speed measuring rotor 12 is disposed on the flange sealing end cover 14, and the flange 141 is used for axially mounting the housing shaft tube 11, the speed measuring rotor 12 and the rotating shaft, that is, the flange 141 is used for axially mounting the housing shaft tube 11, the speed measuring rotor 12, and for axially mounting the speed measuring shaft 16 or the rotating speed output shaft. Specifically, the end of the sealing end cover 13 contacting with the rotor extends towards the rotor to form a flange 141; when the flange type liquid metal rotation speed sensor is provided with the speed measuring shaft 16, one end of the speed measuring shaft 16 penetrates through the sealing end cover 13, enters the inner surface of the speed measuring rotor 12, finally penetrates out of the speed measuring rotor 12 through the flange plate 141, and is flush with or protrudes out of the surface of the flange sealing end cover 14 departing from the speed measuring rotor 12. When the flange-type liquid metal revolution speed sensor is provided with a revolution speed output shaft, the installation of the speed measuring shaft 16 is the same, and the description is omitted again.
Referring to fig. 8, further, a first sealing groove 171 surrounding the rotation shaft is formed on the surfaces of the flange sealing end cover 14 and the sealing end cover 13 facing the tachometer rotor 12, that is, a first sealing groove 171 surrounding the tachometer shaft 16 or the rotational speed output shaft is formed, and a first sealing gasket 173 is disposed in the first sealing groove 171; it can be understood that by providing the first sealing groove 171 and the first sealing gasket 173, the liquid metal in the tachometer cavity 15 can be effectively prevented from leaking at the rotor; and further, the induction electrode 111 and the input electrode 121 cannot be immersed in the liquid metal at the same time, so that the induction electrode 111 and the input electrode 121 can be conducted in time, and the measurement stability and the safety of the flange type liquid metal rotation speed sensor are improved.
Furthermore, on the surfaces of the flange sealing end cover 14 and the sealing end cover 13 facing the tachometer rotor 12, a sealing adjusting ring 18 surrounding the rotating shaft is further provided, that is, a sealing adjusting ring 18 surrounding the tachometer shaft 16 or the rotational speed output shaft is further provided; the sealing adjusting ring 18 is in an O shape, is sleeved on the sealing end cover 13 and the flange sealing end cover 14, and can effectively prevent liquid metal from leaking; and further, the induction electrode 111 and the input electrode 121 cannot be immersed in the liquid metal at the same time, so that the induction electrode 111 and the input electrode 121 can be conducted timely, and the measurement stability and the safety of the flange type liquid metal rotation speed sensor are improved.
Preferably, the flange seal end cover 14 and the seal end cover 13 are provided with a second seal groove 172 surrounding the rotating shaft on the surface facing the housing shaft tube 11, that is, a second seal groove 172 surrounding the speed measuring shaft 16 or the rotating speed output shaft is provided; a second gasket (not shown) is provided in the second seal groove 172. Thereby effectively avoiding the liquid metal leakage on the contact surfaces of the surface sealing end cover 13, the flange sealing end cover 14 and the shell shaft barrel 11; the induction electrode 111 and the input electrode 121 can not be immersed in the liquid metal at the same time, the induction electrode 111 and the input electrode 121 can be conducted in time, and the measurement stability and the safety of the flange type liquid metal rotation speed sensor are improved.
Further, the method for measuring the rotating speed based on the flange type liquid metal rotating speed sensor is used for measuring the rotating speed of an object to be measured, and comprises the following steps:
the rotating speed output end of the object to be measured is connected with the speed measuring rotor of the flange type liquid metal rotating speed sensor;
after an object to be detected is started, the rotating speed R = N/(m multiplied by T) of the object to be detected, wherein N is the number of current pulse signals received by the current detection circuit within a time period T; and m is the number of the input electrodes.
It should be noted that the rotating speed output end of the object to be measured can be a rotating speed output shaft, or a rotating speed output shaft and a speed measuring shaft which are connected through a coupling; the connection mode of the rotating speed output end of the object to be measured and the speed measuring rotor of the flange type liquid metal rotating speed sensor comprises the following steps: the rotating speed output shaft is directly connected with the speed measuring rotor, or the speed measuring shaft is connected with the speed measuring rotor and fixedly connected with the to-be-measured object to rotate the output shaft through a coupler. Further, the design method based on the flange type liquid metal rotation speed sensor comprises the following steps:
according to the temperature condition of the use environment and the heat dissipation performance of the sensor, gallium indium alloy or gallium indium tin alloy manufactured in different proportions is selected, and viscosity test is carried out under the condition of a test circuit;
designing a speed measuring shaft, a key and a speed measuring rotor with an input electrode according to the shaft diameter of the rotating speed output shaft and the rotating speed measuring requirement;
designing the size of the speed measuring cavity according to the viscosity test experiment in the step S11, and designing the number m of input electrodes of the speed measuring rotor according to the width of the speed measuring cavity and the rotating speed measurement requirement;
designing a shell shaft cylinder according to the installation environment and the position size, installing an induction electrode on the inner surface of the shell shaft cylinder, and adjusting and measuring the actual effective gap of the speed cavity through the thickness of a sealing adjusting ring;
and installing the keys and the tachometer rotor with the input electrode on the tachometer shaft according to the test positions of the input electrode on the tachometer rotor corresponding to the induction electrodes.
Designing a sealing end cover and a flange sealing end cover according to the size of a shaft cylinder of the shell, designing a first sealing groove and a second sealing groove on the sealing end cover and the flange sealing end cover, and installing sealing gaskets in the first sealing groove and the second sealing groove; meanwhile, the sealing end cover and the flange sealing end cover are sleeved with sealing adjusting rings, prepared liquid metal is filled into the speed measuring cavity, and the anti-leakage characteristic of the liquid metal is tested;
after the initial assembly, an electrification test experiment is required, and the effectiveness of the assembly is ensured.
Compared with the prior art, the utility model provides a flange type liquid metal rotation speed sensor; the flange-type liquid metal rotation speed sensor comprises: the device comprises an insulated shell shaft cylinder, a speed measuring rotor, a sealing end cover and a flange sealing end cover; the shell shaft tube is sleeved on the speed measuring rotor, the sealing end cover and the flange sealing end cover are respectively fixed at two axially opposite ends of the shell shaft tube and the speed measuring rotor to form a sealed speed measuring cavity, and liquid metal is stored in the speed measuring cavity; the shell shaft cylinder is provided with an induction electrode, and the speed measuring rotor is provided with an input electrode; the induction electrode and the input electrode are immersed in liquid metal and are respectively connected with the same speed measuring circuit; when the speed measurement is carried out, the current flows into the liquid metal through the input electrode, and when the input electrode and the induction electrode face to each other in the same direction, a current pulse signal is output to the speed measurement circuit through the induction electrode. Thereby effectively avoiding the load generated on the flange type liquid metal rotating speed sensor and improving the safety and the stability of the flange type liquid metal rotating speed sensor.
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 (10)
1. A flange-style liquid metal rotational speed sensor for measuring the rotational speed of an object, comprising:
the device comprises an insulated shell shaft cylinder, a speed measuring rotor, a sealing end cover and a flange sealing end cover;
the shell shaft tube is sleeved on the speed measuring rotor, the sealing end cover and the flange sealing end cover are respectively fixed at two axially opposite ends of the shell shaft tube and the speed measuring rotor to form a sealed speed measuring cavity, and liquid metal is stored in the speed measuring cavity;
the shell shaft cylinder is provided with an induction electrode, and the speed measuring rotor is provided with an input electrode; the induction electrode and the input electrode are immersed in liquid metal and are respectively connected with the same speed measuring circuit;
when the speed measurement is carried out, current flows into the liquid metal through the input electrode, and when the input electrode and the induction electrode face to each other in the same direction, a current pulse signal is output to the speed measurement circuit through the induction electrode.
2. The flange-type liquid metal rotation speed sensor according to claim 1, wherein the tachometer rotor is adapted to be connected to a rotating shaft; the rotating shaft is set as a rotating speed output shaft or a speed measuring shaft connected with the rotating speed output shaft through a coupler.
3. The flange-type liquid metal revolution speed sensor according to claim 2, wherein the tachometer rotor is configured as a hollow cylinder comprising a rotor inner surface facing away from the housing shaft, and one end of the rotating shaft is fixed in the rotor inner surface of the tachometer rotor.
4. The flange-type liquid metal rotation speed sensor according to claim 3, further comprising a key, wherein a sliding key groove is formed in an inner surface of one end of the tachometer rotor close to the sealing end cover, and the key is slidably disposed in the sliding key groove and used for fixing the rotating shaft on the inner surface of the rotor.
5. The flange-type liquid metal tachometer sensor of claim 1 wherein the housing shaft includes a sleeve inner surface adjacent the tachometer rotor, the tachometer rotor further including a rotor outer surface adjacent the housing shaft; the induction electrode is arranged on the inner surface of the sleeve, the input electrode is arranged on the outer surface of the rotor, and the induction electrode and the input electrode are arranged on the same surface.
6. The flange-type liquid metal rotational speed sensor according to claim 2, wherein the flange seal end cap faces a flange of the tachometer rotor, and the flange is used for axially mounting the housing shaft, the tachometer rotor and the rotating shaft.
7. The flange-type liquid metal rotation speed sensor according to claim 2, wherein a first sealing groove surrounding the tachometer shaft is formed in the flange seal end cover and the seal end cover facing the tachometer rotor, and a first sealing gasket is disposed in the first sealing groove.
8. The flange-type liquid metal revolution speed sensor according to claim 2, wherein a seal adjusting ring surrounding the rotating shaft is arranged on the flange seal end cover and the face of the seal end cover facing the tachometer rotor.
9. The flange-type liquid metal speed sensor according to claim 2, wherein a second sealing groove surrounding the rotating shaft is formed in the surfaces of the flange sealing end cover and the sealing end cover facing the housing shaft cylinder, and a second sealing gasket is arranged in the second sealing groove.
10. The flange-type liquid metal rotation speed sensor according to any one of claims 1 to 9, wherein the number of the induction electrodes is one, and the number of the input electrodes is one or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920783928.XU CN209946190U (en) | 2019-05-28 | 2019-05-28 | Flange type liquid metal rotation speed sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920783928.XU CN209946190U (en) | 2019-05-28 | 2019-05-28 | Flange type liquid metal rotation speed sensor |
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| CN209946190U true CN209946190U (en) | 2020-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920783928.XU Expired - Fee Related CN209946190U (en) | 2019-05-28 | 2019-05-28 | Flange type liquid metal rotation speed sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261638A (en) * | 2019-05-28 | 2019-09-20 | 南方科技大学 | A kind of flange form liquid metal speed probe and rotating speed measurement method |
| CN113776564A (en) * | 2021-09-29 | 2021-12-10 | 深圳市宽田科技有限公司 | Built-in rotary encoder that detects rotational speed |
-
2019
- 2019-05-28 CN CN201920783928.XU patent/CN209946190U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261638A (en) * | 2019-05-28 | 2019-09-20 | 南方科技大学 | A kind of flange form liquid metal speed probe and rotating speed measurement method |
| CN110261638B (en) * | 2019-05-28 | 2024-04-02 | 南方科技大学 | Flange type liquid metal rotating speed sensor and rotating speed measuring method |
| CN113776564A (en) * | 2021-09-29 | 2021-12-10 | 深圳市宽田科技有限公司 | Built-in rotary encoder that detects rotational speed |
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