CN112145548A - Self-powered rolling bearing, bearing assembly and rotary machine - Google Patents
Self-powered rolling bearing, bearing assembly and rotary machine Download PDFInfo
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- CN112145548A CN112145548A CN202010896843.XA CN202010896843A CN112145548A CN 112145548 A CN112145548 A CN 112145548A CN 202010896843 A CN202010896843 A CN 202010896843A CN 112145548 A CN112145548 A CN 112145548A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/32—Balls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/38—Ball cages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/583—Details of specific parts of races
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention provides a self-powered rolling bearing, a bearing assembly and a rotating machine, wherein the self-powered rolling bearing comprises an inner ring, an outer ring surrounding the inner ring, a rolling body, a first conductive piece and a second conductive piece, the inner ring is made of a non-metal material, the outer ring is made of a non-metal material, the rolling body is arranged between the inner ring and the outer ring, the material of the rolling body is different from that of at least one of the inner ring and the outer ring, the first conductive piece comprises a first electrode, the second conductive piece comprises a second electrode, the first conductive piece and the second conductive piece are both arranged on the side surface of at least one of the inner ring and the outer ring and/or the peripheral surface far away from the rolling body, and the. The self-powered rolling bearing provided by the invention has the advantages of capability of generating electricity by self friction to drive an external load to work, high reliability and long service life.
Description
Technical Field
The invention relates to the technical field of bearing design, in particular to a self-powered rolling bearing, a bearing assembly and a rotating machine.
Background
The rolling bearing is a very important basic component in mechanical equipment and is a core supporting component of a rotating machine. During operation, the bearing rolling bodies roll relative to the outer ring continuously. If the rolling mechanical energy of the rolling element can be collected, the self-powered operation of the rolling bearing can be realized, and the self-powered operation of the rolling bearing can be further used for monitoring the running state of the rolling bearing and early fault early warning. At present, the self-powered bearing based on the electromagnetic type greatly changes the bearing structure and influences the service life of the bearing. The nanometer friction generator proposed by professor Wangzhonglin of the Zongzhi institute of technology academy of engineering in 2012 is widely applied to the field of energy collection due to the advantages of simple structure, easy realization, high power density, environmental friendliness and the like. However, triboelectric generators require direct contact between the dielectric and the electrodes to obtain a certain density of triboelectric surface charges. The operation time and load of the friction generator need to be controlled to avoid the electrode from being worn out too fast to influence the power output of the friction generator. This severely limits its application in the field of mechanical rolling bearings.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides a self-powered rolling bearing which has the advantages of capability of generating electricity by self friction to drive an external load to work, high reliability and long service life.
The self-powered rolling bearing comprises an inner ring, an outer ring surrounding the inner ring, a rolling body, a first conductive piece and a second conductive piece, wherein the inner ring is made of a non-metal material; the outer ring is made of a non-metal material; the rolling body is arranged between the inner ring and the outer ring, and the material of the rolling body is different from that of at least one of the inner ring and the outer ring; the first conductive piece comprises a first electrode, the second conductive piece comprises a second electrode, the first conductive piece and the second conductive piece are arranged on the side surface of the at least one of the inner ring and the outer ring and/or the peripheral surface far away from the rolling body, and the first electrode and the second electrode are distributed at intervals along the circumferential direction of the inner ring.
In some embodiments, the self-powered rolling bearing further comprises a cage made of a non-metallic material, the cage being disposed between the outer ring and the inner ring, the rolling elements being mounted on the cage.
In some embodiments, each of the first electrodes and the second electrodes is provided in plurality, the number of the first electrodes is equal to the number of the second electrodes, the plurality of first electrodes are distributed at equal intervals in the circumferential direction of the inner ring, the plurality of second electrodes are distributed at equal intervals in the circumferential direction of the inner ring, and the plurality of first electrodes and the plurality of second electrodes are staggered in the circumferential direction of the inner ring.
In some embodiments, the first conductive member further includes a first bus portion having a circumferential direction coinciding with a circumferential direction of the inner ring, the first bus portion being connected to each of the first electrodes, and the second conductive member further includes a second bus portion having a circumferential direction coinciding with a circumferential direction of the inner ring, the second bus portion being connected to each of the second electrodes.
In some embodiments, the first conductive member further includes a first wire connection portion disposed at a distance from the first electrode in a circumferential direction of the first bus bar portion; the first wire connecting part is connected with the first confluence part, the second conductive part further comprises a second wire connecting part, the second wire connecting part is connected with the second confluence part, and the second wire connecting part and the second electrode are arranged at intervals along the circumferential direction of the second confluence part.
In some embodiments, the number of first electrodes is equal to the number of rolling bodies, and the number of second electrodes is equal to the number of rolling bodies; or the number of the first electrodes is integral multiple of the number of the rolling bodies, and the number of the second electrodes is integral multiple of the number of the rolling bodies.
In some embodiments, the first conductive member and the second conductive member are bonded to the outer circumferential surface of the outer ring by conductive adhesive, or the first conductive member and the second conductive member are bonded to the inner circumferential surface of the inner ring by conductive adhesive.
In some embodiments, the rolling elements are spherical and the rolling elements are made of ceramic, glass, or steel.
In some embodiments, the outer ring is made of plastic or ceramic, the inner ring is made of plastic or ceramic, and the first and second conductive members are each made of copper foil.
The bearing assembly comprises a monitoring device and the self-powered rolling bearing, wherein a first conductive piece of the self-powered rolling bearing is connected with the monitoring device through a lead, and a second conductive piece of the self-powered rolling bearing is connected with the monitoring device through a lead.
The rotating machine comprises a monitoring device, a self-powered rolling bearing, a shaft and a base, wherein the self-powered rolling bearing is the self-powered rolling bearing, a first conductive piece of the self-powered rolling bearing is connected with the monitoring device through a wire, and a second conductive piece of the self-powered rolling bearing is connected with the monitoring device through a wire; the shaft is matched with an inner ring of the self-powered rolling bearing; the base with the cooperation of self-power antifriction bearing's outer lane.
Drawings
Fig. 1 is a schematic view of a self-powered rolling bearing according to an embodiment of the present invention.
Fig. 2 is an exploded view of a self-powered rolling bearing according to an embodiment of the present invention.
Fig. 3 is a schematic view of a self-powered rolling bearing according to an embodiment of the present invention when assembled with a shaft and a base.
Fig. 4 is a graph showing the variation of the output current of the self-powered rolling bearing at different rotation speeds according to the embodiment of the present invention.
Fig. 5 is a graph of the output power variation of the self-powered rolling bearing according to the embodiment of the invention under different load resistances.
Fig. 6 is a circuit diagram when the self-powered rolling bearing according to the embodiment of the present invention drives an external load.
Fig. 7 is a graph showing the change in output current of the self-powered rolling bearing according to the embodiment of the present invention when the rolling elements are missing.
Fig. 8 is a graph showing the variation of the output current of the self-powered rolling bearing according to the embodiment of the present invention when supporting different load weights.
Fig. 9 is a graph showing a change in output current of the self-powered rolling bearing according to the embodiment of the present invention when it is continuously operated.
The self-powered rolling bearing comprises a self-powered rolling bearing 100, an inner ring 1, an outer ring 2, a rolling body 3, a first conductive piece 4, a first electrode 401, a first confluence part 402, a second conductive piece 5, a second electrode 501, a second confluence part 502, a retainer 6, a shaft 7 and a base 8.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The self-powered rolling bearing 100 according to the embodiment of the present invention includes an inner ring 1, an outer ring 2 surrounding the inner ring 1, rolling bodies 3, a first conductive member 4, and a second conductive member 5. The inner ring 1 is made of a non-metallic material and the outer ring 2 is made of a non-metallic material. The rolling element 3 is provided between the inner ring 1 and the outer ring 2, and the material of the rolling element 3 is different from that of at least one of the inner ring 1 and the outer ring 2. The first conductive member 4 includes a first electrode 401, the second conductive member 5 includes a second electrode 501, and the first conductive member 4 and the second conductive member 5 are provided on a side surface of at least one of the inner ring 1 and the outer ring 2 and/or a circumferential surface away from the rolling body 3. The first electrodes 401 and the second electrodes 501 are spaced apart along the circumferential direction of the inner ring 1.
According to the self-powered rolling bearing 100 of the embodiment of the present invention, when the inner ring 1 and the outer ring 2 rotate relative to each other, the rolling elements 3 engaged between the inner ring 1 and the outer ring 2 roll relative to the inner ring 1 and the outer ring 2, and thus, when the material of the rolling elements 3 is different from that of the inner ring 1/the outer ring 2, the rolling elements 3 generate electricity by friction with the inner ring 1/the outer ring 2 based on the triboelectric effect, that is, the same amount of electric charges are generated on the surfaces of the rolling elements 3 and the surfaces of the inner ring 1/the.
At this time, after the first conductive member 4 and the second conductive member 5 are connected to an external load through wires to form a closed circuit, when the rolling body 3 rolls from the first electrode 401 to the second electrode 501, the electrostatic induction effect drives negative charges to flow from the first electrode 401 to the second electrode 501 through the external load to balance a local electric field on the dielectric. Wherein all negative charges are driven to the second electrode 501 when the rolling elements 3 pass the second electrode 501. When the rolling body 3 subsequently rolls from the second electrode 501 to the first electrode 401, the electrostatic induction effect will drive a negative charge to flow from the second electrode 501 to the first electrode 401 through the external load to balance the local electric field on the dielectric. Wherein all negative charges are driven to the first electrode 401 when each rolling element 3 passes the first electrode 401. Therefore, as each rolling element 3 continuously rolls relative to the inner ring 1/the outer ring 2, negative charges always flow from the first conductive member 4 to the second conductive member 5, and a circuit is closed in the process to form a first-direction current. It may also occur that negative charge flows from the second conducting member 5 to the first conducting member 4, thereby closing the circuit in the process and causing current flow in a second direction opposite to the first direction. The current in the first direction and the current in the second direction are alternately generated in the closed circuit, so that an alternating current is formed in the closed circuit, and the function of supplying power to the external load by the self-powered rolling bearing 100 to drive the external load to work is realized.
In addition, the first conductive member 4 and the second conductive member 5 are provided on the side surface of at least one of the inner ring 1 and the outer ring 2 and/or the peripheral surface away from the rolling elements 3. The structural integrity of the original rolling bearing is guaranteed, meanwhile, the first conductive piece 4, the second conductive piece 5 and the rolling body 3 are arranged in an isolated mode, abrasion caused by rolling friction between the first conductive piece 4, the second conductive piece 5 and the rolling body 3 is effectively avoided, the self-powered rolling bearing 100 is high in reliability and long in service life, and the stability of the power output to a closed circuit is guaranteed.
Therefore, the self-powered rolling bearing 100 according to the embodiment of the invention has the advantages of being capable of generating electricity by self-friction to drive an external load to work, high in reliability, long in service life and the like.
Note that the above-mentioned rolling element 3 passes through the first electrode 401, and refers to a position where the rolling element 3 is located closest to the first electrode 401, and the rolling element 3 and the first electrode 401 are opposed to each other in the radial direction of the inner ring 1. The rolling element 3 mentioned above passes through the second electrode 501, and means a position where the rolling element 3 is located closest to the second electrode 501, and the rolling element 3 and the second electrode 501 are opposed to each other in the radial direction of the inner ring 1. It is also preferable to provide a plurality of rolling elements 3 spaced apart in the circumferential direction of the inner ring 1. Further, when the outer ring 2 of the self-powered rolling bearing 100 rotates while the inner ring 1 does not move, the first conductive member 4 and the second conductive member 5 are preferably provided on the side surface of the inner ring 1 and/or the peripheral surface away from the rolling bodies 3. When the inner ring 1 of the self-powered rolling bearing 100 rotates and the outer ring 2 does not move, the first conductive member 4 and the second conductive member 5 are preferably provided on the side surface of the outer ring 2 and/or the peripheral surface away from the rolling bodies 3.
As shown in fig. 1 and 2, the self-powered rolling bearing 100 may include an inner ring 1, an outer ring 2 surrounding the inner ring 1, rolling bodies 3, a cage 6, a first conductive member 4, and a second conductive member 5.
Wherein, the retainer 6 is made of non-metal materials, the retainer 6 is arranged between the outer ring 2 and the inner ring 1, and the rolling body 3 is arranged on the retainer 6. Thus, the cage 6 has the plurality of rolling elements 3 arranged at equal intervals in the circumferential direction of the inner ring 1, and also ensures that each rolling element 3 rolls more uniformly. Meanwhile, the retainer 6 can effectively prevent the rolling elements 3 from falling off to influence the stability of the current output from the energy-supplying rolling bearing 100 to the closed circuit.
Specifically, the holder 6 is preferably made of a high molecular polymer material.
In some embodiments, there are a plurality of first electrodes 401 and a plurality of second electrodes 501, and the number of first electrodes 401 is equal to the number of second electrodes 501. The plurality of first electrodes 401 are distributed at equal intervals along the circumferential direction of the inner ring 1, the plurality of second electrodes 501 are distributed at equal intervals along the circumferential direction of the inner ring 1, and the plurality of first electrodes 401 and the plurality of second electrodes 501 are arranged in a staggered manner along the circumferential direction of the inner ring 1. Thus, each first electrode 401 constitutes an electrode pair with one of the adjacent second electrodes 501, the number of the electrode pairs is the number of the first electrodes 401, and a plurality of the electrode pairs are arranged at equal intervals in the circumferential direction of the inner ring 1. At this time, when the plurality of rolling elements 3 are arranged at equal intervals along the circumferential direction of the inner ring 1, the current output from the self-powered rolling bearing 100 to the closed circuit is more stable and regular, so that the work of an external load in the closed circuit is more stable, and thus the stable monitoring of the running state of the self-powered rolling bearing 100 and the accurate early warning of early faults according to the embodiment of the invention are realized.
Specifically, as shown in fig. 2, the distance between the first electrode 401 and the second electrode 501 in each electrode pair is the same as the distance between the adjacent electrode pairs. That is, the distance between any adjacent first electrode 401 and second electrode 501 is the same. Further, taking the self-powered rolling bearing 100 according to the embodiment of the present invention as an example where the outer ring 2 is stationary and the inner ring 1 rotates when operating, the first conductive plates and the second conductive plates are both provided on the outer circumferential surface of the outer ring 2, and a portion of the plurality of first electrodes 401 and a portion of the plurality of second electrodes 501 are alternately provided in the central region of the outer circumferential surface of the outer ring 2 in the circumferential direction of the inner ring 1.
In some embodiments, the first conductive member 4 further includes a first bus portion 402, a circumferential direction of the first bus portion 402 coincides with a circumferential direction of the inner ring 1, the first bus portion 402 is connected to each of the first electrodes 401, the second conductive member 5 further includes a second bus portion 502, a circumferential direction of the second bus portion 502 coincides with a circumferential direction of the inner ring 1, and the second bus portion 502 is connected to each of the second electrodes 501. Therefore, the first bus bar part 402 and the second bus bar part 502 can be connected with an external load through two wires to form a closed circuit, and the connection of the closed circuit is convenient.
Specifically, the first conductive member 4 and the second conductive member 5 are both comb-shaped structures, in which the first bus portion 402 and the second bus portion 502 are both annular pieces. Taking the self-powered rolling bearing 100 according to the embodiment of the present invention as an example, when the outer ring 2 is stationary and the inner ring 1 rotates during operation, the first bus bar portion 402 and the second bus bar portion 502 are both provided on the outer circumferential surface of the outer ring 2 and spaced apart from each other along the axial direction 7 of the inner ring 1, the plurality of first electrodes 401 are connected to the first bus bar portion 402 on the side facing the second bus bar portion 502, and the plurality of second electrodes 501 are connected to the second bus bar portion 502 on the side facing the first bus bar portion 402.
In some embodiments, the first conductive member 4 further includes a first conductive wire connecting portion (not shown) connected to the first bus portion 402, and the first conductive wire connecting portion and the first electrode 401 are spaced apart from each other along the circumferential direction of the first bus portion 402. The second conductive member 5 further includes a second wire connecting portion connected to the second bus portion 502, and the second wire connecting portion and the second electrode 501 are disposed at an interval in the circumferential direction of the second bus portion 502. Therefore, the first bus part 402 is connected with the wires in the closed circuit through the first wire connecting part, the second bus part 502 is connected with the wires in the closed circuit through the second wire connecting part, and the wires in the closed circuit are connected with the self-powered bearing more conveniently, quickly and stably.
Specifically, the first wire connecting portion is a conductive sheet protruding toward the first bus portion 402, the second wire connecting portion is a conductive sheet protruding toward the second bus portion 502, and the wires in the closed circuit may be connected to the conductive sheets by winding or welding.
In some embodiments, the number of first electrodes 401 is equal to the number of rolling elements 3, and the number of second electrodes 501 is equal to the number of rolling elements 3. At this time, the position of each rolling element 3 relative to the first conductive sheet and the second conductive sheet is the same, for example, when one rolling element 3 passes through the first electrode 401, all the other rolling elements 3 also just pass through different first electrodes 401. Thus, when each rolling element 3 continuously rolls with respect to the inner ring 1/the outer ring 2, all the rolling elements 3 simultaneously roll from the first electrode 401 to the second electrode 501, so that negative charges at all the first electrodes 401 flow to the second electrode 501 through an external load, thereby forming a first-direction current in a closed circuit. All the rolling bodies 3 roll from the second electrode 501 to the first electrode 401 at the same time, so that the negative charges at all the second electrodes 501 flow to the first electrode 401 through the external load, thereby forming a second direction current opposite to the first direction in the closed circuit, and the first direction current is substantially equal to the second direction current.
At this time, when the rolling element 3 rolls from the first electrode 401 to the second electrode 501, the rolling element 3 may roll from the second electrode 501 to the first electrode 401 at the same time, and the negative charge flowing in the external load may not be reduced. Therefore, when the rotation speed of the self-powered rolling bearing 100 is constant, the change of the alternating current in the closed circuit is more stable, and the output current in the closed circuit is larger.
Alternatively, the number of the first electrodes 401 is an integral multiple of the number of the rolling elements 3, and the number of the second electrodes 501 is an integral multiple of the number of the rolling elements 3. Similarly, the position of each rolling element 3 relative to the first conductive sheet and the second conductive sheet is the same, for example, when one rolling element 3 passes through the first electrode 401, all the other rolling elements 3 also pass through the different first electrodes 401. Therefore, it is also possible to stabilize the change of the alternating current in the closed circuit and to increase the output current in the closed circuit when the rotation speed of the self-energizing rolling bearing 100 is constant.
Specifically, still taking the self-powered rolling bearing 100 according to the embodiment of the present invention as an example, when the outer ring 2 is stationary and the inner ring 1 rotates (the shaft 7 is installed in the inner ring 1, and the shaft 7 drives the inner ring 1 to rotate), as shown in fig. 8, after loads with different weights are installed on the shaft 7, the rms value of the output current in the closed circuit and the rotation speed of the self-powered rolling bearing 100 both change in a substantially linear proportion. Therefore, the self-powered rolling bearing 100 can obtain stable output current regardless of the load or no load during the working process. As shown in fig. 9, as the operation time of the self-powered rolling bearing 100 is prolonged, the output current in the closed circuit is substantially unchanged, thereby illustrating that the self-powered rolling bearing 100 according to the embodiment of the present invention has stable power generation during operation, and has practical application value.
In some embodiments, the first conductive member 4 and the second conductive member 5 are bonded to the outer circumferential surface of the outer ring 2 by conductive adhesive, or the first conductive member 4 and the second conductive member 5 are bonded to the inner circumferential surface of the inner ring 1 by conductive adhesive. Therefore, the installation of the first conductive member 4 and the second conductive member 5 on the inner ring 1/the outer ring 2 does not affect the structural strength of the inner ring 1/the outer ring 2, thereby ensuring that the working performance of the self-powered rolling bearing 100 according to the embodiment of the invention is not affected. Moreover, the installation mode is simple and convenient, and the original rolling bearing is easier to modify.
In some embodiments, the rolling elements 3 are spherical and the rolling elements 3 are made of ceramic, glass or steel. Therefore, the rolling bodies 3 of the rolling ball bearing during operation can rotate more uniformly relative to the inner ring 1 and the outer ring 2, and more stable charges are generated on the outer surface of the rolling ball bearing through the triboelectric effect, so that the stability of current in a closed circuit is ensured.
In some embodiments, outer ring 2 is made of plastic or ceramic, inner ring 1 is made of plastic or ceramic, and first and second conductive members 4 and 5 are each made of copper foil. Thereby ensuring that the strength of the inner ring 1 and the outer ring 2 is substantially the same as that of the outer ring 2 and the inner ring 1 in the rolling bearing in the related art. It is also avoided that the inner ring 1/the outer ring 2 electrically connects the first conductive member 4 and the second conductive member 5 together resulting in a closed circuit short circuit.
Specifically, the first conductive piece 4 and the second conductive piece 5 are cut by a copper foil, the first conductive piece 4 and the second conductive piece 5 are both of an end-to-end annular structure, and the first conductive piece 4 and the second conductive piece 5 are sleeved on the outer ring 2 and are both in contact with the outer peripheral surface of the outer ring 2 in a fitting manner.
The bearing assembly according to the embodiment of the invention comprises the monitoring device and the self-powered rolling bearing 100, wherein the first conductive piece 4 of the self-powered rolling bearing 100 is connected with the monitoring device through a wire, and the second conductive piece 5 of the self-powered rolling bearing 100 is connected with the monitoring device through a wire.
According to the bearing assembly of the embodiment of the present invention, the first conductive member 4 and the second conductive member 5 in the self-powered rolling bearing 100 are connected to the monitoring device by wires to form a closed circuit. When the self-powered rolling bearing 100 works, alternating current is generated in a closed circuit, and then the monitoring device works, so that the monitoring of the running state of the self-powered rolling bearing 100 (such as the rotating speed of the self-powered rolling bearing 100) and early warning of early faults are realized.
Furthermore, other technical advantages of the bearing assembly according to the embodiment of the present invention are the same as those of the self-powered rolling bearing 100 described above, and are not described herein again.
Specifically, as shown in fig. 4, the rms value of the output current in the closed circuit changes in substantially linear proportion to the rotation speed of the self-powered rolling bearing 100. Therefore, the monitoring device can monitor the rotating speed of the self-powered rolling bearing 100 by monitoring the output current in real time, and further monitor the running state of the self-powered rolling bearing 100.
As shown in fig. 7, when the rotation speed of self-powered rolling bearing 100 is constant, the root mean square value of the output current in the closed circuit changes substantially linearly in proportion to the number of missing rolling elements 3. Therefore, the monitoring device can monitor the number of missing rolling elements 3 by monitoring the output current in real time, and further early fault early warning of the self-powered rolling bearing 100 is realized.
It should be noted that, as shown in fig. 6, the monitoring device is generally a low power consumption device to ensure that the output power of the self-powered rolling bearing 100 can ensure the normal operation of the monitoring device. Meanwhile, a capacitor connected with the monitoring device in parallel can be further arranged in the closed circuit, interference signals can be filtered by the capacitor, and the current output from the energy supply rolling bearing 100 to the closed circuit is further stable. Moreover, as shown in fig. 5, a monitoring device with an appropriate resistance may be selected according to a relationship between the resistance of the monitoring device and a power peak-to-peak value of the output power, so as to further ensure a normal operation of the monitoring device.
As shown in fig. 3, the rotary machine according to the embodiment of the present invention includes a monitoring device, a self-powered rolling bearing 100, a shaft 7, and a base 8. The self-powered rolling bearing 100 is the self-powered rolling bearing 100, the first conductive member 4 of the self-powered rolling bearing 100 is connected with the monitoring device through a wire, and the second conductive member 5 of the self-powered rolling bearing 100 is connected with the monitoring device through a wire. The shaft 7 is engaged with the inner ring 1 of the self-energizing rolling bearing 100. The base 8 is fitted with the outer ring 2 of the self-energizing rolling bearing 100.
According to the rotating machine provided by the embodiment of the invention, the shaft 7 is arranged to be matched with the inner ring 1 of the self-powered rolling bearing 100, and the base 8 is matched with the outer ring 2 of the self-powered rolling bearing 100, so that the shaft 7 rotates more stably relative to the base 8. And when the shaft 7 rotates, the self-powered rolling bearing 100 generates electricity by self friction to drive the monitoring device to work, so that the monitoring and early fault early warning of the running state of the self-powered rolling bearing 100 and the shaft 7 are realized, and the stable work of the rotating machine is further ensured.
Furthermore, other technical advantages of the rotary machine according to the embodiment of the present invention are the same as those of the self-powered rolling bearing 100 and the bearing assembly described above, and will not be described herein again.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial 7", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A self-powered rolling bearing, characterized by comprising:
the inner ring is made of a non-metallic material;
an outer ring surrounding the inner ring, the outer ring being made of a non-metallic material;
a rolling element provided between the inner ring and the outer ring, the rolling element being made of a material different from that of at least one of the inner ring and the outer ring; and
the first conductive piece comprises a first electrode, the second conductive piece comprises a second electrode, the first conductive piece and the second conductive piece are arranged on the side face of the at least one of the inner ring and the outer ring and/or the peripheral face far away from the rolling body, and the first electrode and the second electrode are distributed at intervals along the circumferential direction of the inner ring.
2. The self-powered rolling bearing of claim 1 further comprising a cage made of a non-metallic material, the cage disposed between the outer race and the inner race, the rolling elements being mounted on the cage.
3. The self-powered rolling bearing according to claim 2, wherein the first electrodes and the second electrodes are provided in plural, the number of the first electrodes is equal to the number of the second electrodes, the plural first electrodes are distributed at equal intervals in the circumferential direction of the inner ring, the plural second electrodes are distributed at equal intervals in the circumferential direction of the inner ring, and the plural first electrodes and the plural second electrodes are staggered in the circumferential direction of the inner ring.
4. The self-powered rolling bearing according to claim 3, wherein the first conductive member further includes a first joining portion, a circumferential direction of the first joining portion coincides with a circumferential direction of the inner ring, the first joining portion is connected to each of the first electrodes, the second conductive member further includes a second joining portion, a circumferential direction of the second joining portion coincides with a circumferential direction of the inner ring, and the second joining portion is connected to each of the second electrodes.
5. The self-powered rolling bearing according to claim 4, wherein the first conductive member further includes a first wire connecting portion connected to the first bus bar portion, the first wire connecting portion and the first electrode being provided at intervals in a circumferential direction of the first bus bar portion; the second conductive piece further comprises a second wire connecting portion, the second wire connecting portion is connected with the second confluence portion, and the second wire connecting portion and the second electrode are arranged at intervals along the circumferential direction of the second confluence portion.
6. Self-powered rolling bearing according to claim 3, characterized in that the number of first electrodes is equal to the number of rolling bodies and the number of second electrodes is equal to the number of rolling bodies; or the number of the first electrodes is integral multiple of the number of the rolling bodies, and the number of the second electrodes is integral multiple of the number of the rolling bodies.
7. The self-powered rolling bearing according to claim 1, wherein the first conductive member and the second conductive member are bonded to the outer circumferential surface of the outer ring by a conductive adhesive, or the first conductive member and the second conductive member are bonded to the inner circumferential surface of the inner ring by a conductive adhesive.
8. The self-powered rolling bearing of claim 1, wherein the rolling elements are spherical, the rolling elements are made of ceramic, glass, or steel, the outer ring is made of plastic or ceramic, the inner ring is made of plastic or ceramic, and the first and second conductive members are each made of copper foil.
9. Bearing assembly, comprising a monitoring device and a self-powered rolling bearing according to any of claims 1 to 8, the first electrically conductive part of the self-powered rolling bearing being connected to the monitoring device by a wire and the second electrically conductive part of the self-powered rolling bearing being connected to the monitoring device by a wire.
10. A rotary machine, comprising:
a monitoring device;
the self-powered rolling bearing is as claimed in any one of claims 1 to 8, a first conductive piece of the self-powered rolling bearing is connected with the monitoring device through a wire, and a second conductive piece of the self-powered rolling bearing is connected with the monitoring device through a wire;
the shaft is matched with the inner ring of the self-powered rolling bearing; and
the base, the base with the cooperation of self-power antifriction bearing's outer lane.
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| CN202010896843.XA CN112145548B (en) | 2020-08-31 | 2020-08-31 | Self-powered rolling bearing, bearing assembly and rotary machine |
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| CN202010896843.XA CN112145548B (en) | 2020-08-31 | 2020-08-31 | Self-powered rolling bearing, bearing assembly and rotary machine |
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| CN112747031A (en) * | 2021-02-04 | 2021-05-04 | 浙江师范大学 | Sliding bearing |
| CN112780669A (en) * | 2021-02-04 | 2021-05-11 | 浙江师范大学 | Roller bearing with monitoring device |
| CN112834213A (en) * | 2021-02-04 | 2021-05-25 | 浙江师范大学 | Gearbox state monitoring system |
| CN114704552A (en) * | 2022-03-30 | 2022-07-05 | 深圳大学 | Current-carrying solid film lubrication bearing and friction control method thereof |
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