CN114635920A - Suspension bearing, control method and application thereof - Google Patents

Suspension bearing, control method and application thereof Download PDF

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Publication number
CN114635920A
CN114635920A CN202011480241.2A CN202011480241A CN114635920A CN 114635920 A CN114635920 A CN 114635920A CN 202011480241 A CN202011480241 A CN 202011480241A CN 114635920 A CN114635920 A CN 114635920A
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CN
China
Prior art keywords
annular
bearing
suspension
pressure
rotor
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Pending
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CN202011480241.2A
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Chinese (zh)
Inventor
陈进华
胡雄龙
张�杰
张驰
王冬杰
蒋哲
高云鹏
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Ningbo Institute of Material Technology and Engineering of CAS
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Ningbo Institute of Material Technology and Engineering of CAS
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Priority to CN202011480241.2A priority Critical patent/CN114635920A/en
Publication of CN114635920A publication Critical patent/CN114635920A/en
Pending legal-status Critical Current

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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
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
    • F16C32/064—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion the liquid being supplied under pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/32—Other parts
    • B63H23/321—Bearings or seals specially adapted for propeller shafts
    • 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
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
    • F16C32/064—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion the liquid being supplied under pressure
    • F16C32/0644—Details of devices to control the supply of liquids to the bearings
    • F16C32/0648—Details of devices to control the supply of liquids to the bearings by sensors or pressure-responsive control devices in or near the bearings
    • 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
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
    • F16C32/064—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion the liquid being supplied under pressure
    • F16C32/0651—Details of the bearing area per se
    • F16C32/0655—Details of the bearing area per se of supply openings
    • 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
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0662—Details of hydrostatic bearings independent of fluid supply or direction of load
    • F16C32/067—Details of hydrostatic bearings independent of fluid supply or direction of load of bearings adjustable for aligning, positioning, wear or play
    • 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
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0681—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load
    • F16C32/0692—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load for axial load only
    • 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
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0681—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load
    • F16C32/0696—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load for both radial and axial load
    • 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
    • F16C37/00—Cooling of bearings
    • F16C37/002—Cooling of bearings of fluid bearings
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/30—Ships, e.g. propelling shafts and bearings therefor

Abstract

The invention discloses a suspension bearing, a control method and application thereof. The suspension bearing comprises a first annular piece and a second annular piece which are matched with each other, an annular concave part is formed on the first annular piece, an annular convex part is formed on the second annular piece, a semi-closed annular bearing cavity is formed between the annular convex part and the annular concave part in a matched mode, and when the pressure of fluid in the bearing cavity reaches a set value, the first annular piece and the second annular piece are at least separated in a suspension mode in the axial direction. Compared with the prior art, the suspension bearing provided by the embodiment of the invention has the advantages of simple structure, convenience in installation, small friction resistance in use, high operation efficiency, capability of obviously enhancing the heat dissipation capacity of the bearing and the motor, improvement of the reliability of system operation, vibration reduction and noise reduction effects, great significance for ship propulsion energy conservation, and wide prospect in the civil market and the military field.

Description

Suspension bearing, control method and application thereof
Technical Field
The invention relates to a bearing, in particular to a suspension bearing, a control method and application thereof, and belongs to the field of underwater bearings.
Background
The rim driving propeller mainly comprises a guide pipe, a rotor, a bearing, a paddle and other components, wherein a motor, an iron core and a coil are integrally placed in an inner cavity of the guide pipe as a stator, a permanent magnet is placed at the blade tip part of the propeller as a rotor and appears in a ring mode, a certain gap exists between the inner part of the guide pipe and the ring rotor, and the guide pipe and the ring rotor are connected by the bearing. After the motor is electrified, the rotor ring drives the propeller blades to rotate, axial thrust is generated, and the rotor can be subjected to force in the axial direction. In order to limit the axial movement of the rotating shaft, a thrust bearing is required to be installed in the rotor system. The conventional thrust bearing is a common contact bearing, and comprises a rolling bearing and a sliding bearing. As the rotating speed of the rotor increases, the conventional contact bearings cannot meet the requirement of the operating rotating speed due to the existence of large mechanical wear and the accompanying large vibration and noise, so that the non-contact bearings are required to be used for replacing the contact bearings.
Conventional bearing structures include rolling bearing structures, magnetic bearing structures, oil lubricated sliding bearing structures, and water lubricated sliding bearing structures. Wheel rim thrusters have tried rolling bearing configurations in early evolution, but because of the operating environment, prototype testing results were not ideal, mainly due to the poor reliability of ball bearings in silt environments and excessive bearing wear. In addition, ball bearings also have inherent disadvantages in terms of vibration noise and load bearing capacity. In the subsequent evolution process, the wheel rim motor propulsion device bearing gradually develops towards a sliding bearing, the oil lubrication bearing seriously pollutes the environment, the bearing structure is generally not adopted in the underwater environment, most commercial integrated motor propulsion device products mainly adopt a water lubrication sliding bearing structure, but because the viscosity coefficient of water is small, a bearing gap lubrication water film is not easy to form, or the formed state is unstable and easy to lose efficacy, so that the bearing is in a mixed friction state under most conditions, and the problems of abrasion, low efficiency, vibration, noise and the like cannot be fundamentally solved. The non-contact bearing generally comprises a magnetic bearing. However, when the magnetic bearing is opened for a long time, the magnetic bearing has the defects of too large energy consumption, heat generation, magnetic interference and vibration generated by the impact of the pulsating force generated in the rotation process of the propeller on the magnetic bearing, and the magnetic bearing cannot be widely used at present.
Therefore, the existing bearing structures cannot be applied to high-power rim propellers, and improvement is needed.
Disclosure of Invention
The invention aims to provide a suspension bearing system, a control method and application thereof, so as to overcome the defects in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
some embodiments of the invention provide a suspension bearing comprising a first annular member and a second annular member cooperating with each other, the first annular member having an annular recess formed therein, the second annular member having an annular projection formed therein, the annular projection and the annular recess cooperating to form a semi-enclosed annular bearing cavity, the first annular member and the second annular member being at least axially suspended apart when a fluid pressure within the bearing cavity reaches a set value.
Further, when the fluid pressure in the bearing cavity reaches a set value, a small gap exists between the first annular member and the second annular member in the radial direction, and meanwhile, the second annular member can freely rotate around the axis of the suspension bearing.
Some embodiments of the invention also provide for the use of the suspension bearing. The suspension bearing can be applied to equipment which works under water and mainly bears axial force. For example, the suspension bearing can be applied to the preparation of rim propellers, ships, underwater vehicles and other equipment.
Some embodiments of the present invention further provide a suspension bearing system, which includes the suspension bearing and a position monitoring mechanism, wherein the position monitoring mechanism is at least used for monitoring the suspension distance of the first annular element and the second annular element in the suspension bearing in the axial direction, and is also connected with a control unit, and the control unit is connected with a hydraulic pump, and the hydraulic pump is at least used for regulating and controlling the fluid pressure in a bearing cavity in the suspension bearing.
Some embodiments of the present invention also provide a control method of the suspension bearing system, which includes: and at least regulating and controlling the fluid pressure in a bearing cavity in the suspension bearing by using a hydraulic pump to enable the second annular piece to move relative to the first annular piece in the axial direction, so that the suspension distance between the first annular piece and the second annular piece in the axial direction is within a set numerical range.
Some embodiments of the present invention further provide a rim propeller, which includes the suspension bearing system, a guide pipe, a motor, and a propeller, wherein a first annular member of the suspension bearing system is fixedly connected to an axial end surface of the guide pipe, a stator and a rotor of the motor are respectively fixedly connected to the guide pipe and a second annular member, and a blade of the propeller is further installed at an annular center of the rotor.
Some embodiments of the present invention also provide a control method of the suspension bearing, which includes:
synchronously starting a motor and a hydraulic pump, controlling the hydraulic pump to pressurize a bearing cavity in the suspension bearing system, and enabling the second annular element and the rotor to integrally move in the axial direction under the action of pressure so as to enable the suspension distance of the first annular element and the second annular element in the axial direction to be within a set numerical range;
the axial suspension distance between the first annular piece and the second annular piece is detected by a position monitoring mechanism, if the suspension distance is within a set value interval, the pressure in a stable bearing cavity of a hydraulic pump is controlled, if the suspension distance is smaller than a lower limit value of the set value interval, the hydraulic pump is controlled to increase the pressure, the second annular piece and the whole rotor move axially, so that the suspension distance is increased to enter the set value interval, and if the suspension distance is larger than an upper limit value of the set value interval, the hydraulic pump is controlled to decrease the pressure, so that the second annular piece and the whole rotor move axially in a reverse direction under the thrust action of a propeller, and the suspension distance is decreased to enter the set value interval.
Compared with the prior art, the suspension bearing provided by the embodiment of the invention has the advantages that when the suspension bearing is used, the friction resistance is small, the operation efficiency is high, the heat dissipation capacity of the bearing and a motor can be obviously enhanced, the operation reliability of a system is improved, the vibration reduction and noise reduction effects are realized, the suspension bearing has important significance on ship propulsion energy saving, and the suspension bearing has wide prospects in the civil market and the military field.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of an assembly structure of a water suspension bearing according to an exemplary embodiment of the present invention.
Fig. 2 a-2 b are schematic structural diagrams of a bearing stator ring according to an exemplary embodiment of the present invention.
Fig. 3a is a schematic view of a bearing rotor ring having a circular spiral water groove according to an exemplary embodiment of the present invention.
FIG. 3b is a schematic view of a bearing rotor ring having a triangular spiral water groove according to an exemplary embodiment of the present invention.
Fig. 4 is a flow chart illustrating system control of a rim thruster in an exemplary embodiment of the present invention.
Description of reference numerals: the device comprises a guide pipe 1, a bearing stator ring 2, a bearing rotor ring 3, a rotor 4, a hydraulic pipe 5, a propeller 6, a circular spiral water tank 7, a triangular spiral water tank 8, a pressure hole 9, an annular groove 10, an annular boss 11 and a bearing cavity 12.
Detailed Description
As mentioned above, in view of the disadvantages of the existing bearings, such as the problems of the existing water lubricated bearings that the axial contact friction causes the energy consumption loss to be too large and the vibration noise to be obvious, the inventor of the present invention has made a long-term study and a long-term study to provide the technical solution of the present invention, which will be described in detail below.
One aspect of the embodiments of the present invention provides a suspension bearing, including a first ring member and a second ring member that are engaged with each other, the first ring member having an annular recess formed thereon, the second ring member having an annular protrusion formed thereon, the annular protrusion and the annular recess being engaged with each other to form a semi-closed annular bearing cavity, and the first ring member and the second ring member being at least axially suspended and separated when a fluid pressure in the bearing cavity reaches a set value.
In some embodiments, when the fluid pressure within the bearing cavity reaches a set value, a slight gap also exists between the first and second annular members in the radial direction.
In some embodiments, the first annular member and the second annular member are coated with a corrosion and wear resistant material. The wear-resistant and corrosion-resistant material can be various wear-resistant and corrosion-resistant coatings and the like known in the field.
In some embodiments, the second ring is free to rotate about the axis of the suspension bearing.
In some embodiments, the radial wall surface of the annular protrusion further comprises a plurality of fluid grooves extending in the direction of rotation of the second ring member.
Further, the fluid groove includes a spiral groove or a parabolic groove, and is not limited thereto.
Further, the plurality of fluid grooves are evenly distributed along the circumferential direction.
In some embodiments, at least one of the first and second rings has one or more pressure holes distributed therein, the pressure holes being in communication with the bearing cavity and configured to inject a fluid into the bearing cavity.
In some embodiments, the fluid comprises water.
In some embodiments, the axial cross-sectional shape of the fluid groove includes a semicircle, a triangle, or a rectangle, and is not limited thereto.
In some embodiments, the pressure port communicates with a hydraulic pump through a hydraulic line.
In some embodiments, the pressure holes are a plurality of pressure holes, and are axially symmetrically distributed along the circumferential direction of the first annular member.
In some embodiments, the pressure hole is provided on the first ring member, and a hole axis of the pressure hole is parallel to an axis of the suspension bearing.
In some embodiments, the pressure hole is disposed on the first ring member, and a hole axis of the pressure hole forms an inclination angle with an axis of the suspension bearing and faces a circumferential rotation direction of the second ring member.
Another aspect of an embodiment of the present invention provides a suspension bearing system including the suspension bearing, and a position monitoring mechanism, where the position monitoring mechanism is at least used for monitoring a suspension distance between a first annular member and a second annular member in the suspension bearing in an axial direction, and the position monitoring mechanism is further connected to a control unit, where the control unit is connected to a hydraulic pump, and the hydraulic pump is at least used for regulating and controlling a fluid pressure in a bearing cavity in the suspension bearing.
The position monitoring mechanism may employ any suitable type of position monitoring device known in the art, such as, but not limited to, a contact or non-contact position sensor, etc.
Another aspect of the embodiments of the present invention provides a control method of the suspension bearing system, including: and at least regulating and controlling the fluid pressure in a bearing cavity in the suspension bearing by using a hydraulic pump to enable the second annular piece to move relative to the first annular piece in the axial direction, so that the suspension distance between the first annular piece and the second annular piece in the axial direction is within a set numerical range.
According to another aspect of the embodiment of the invention, the rim propeller comprises the suspension bearing system, a guide pipe, a motor and a propeller, wherein a first annular piece in the suspension bearing system is fixedly connected with an axial end face of the guide pipe, a stator and a rotor of the motor are respectively and fixedly connected with the guide pipe and a second annular piece, and blades of the propeller are further mounted at the annular center of the rotor.
In some embodiments, the winding portion of the stator is integrally disposed in a conduit.
In some embodiments, the rotor has integrated therein a motor rotor magnetic steel portion.
In some embodiments, a second ring member is symmetrically disposed on each end of the rotor.
In some embodiments, the position monitoring mechanism in the suspension bearing system is fixedly disposed inside the catheter.
In some embodiments, a hydraulic tube is disposed within the conduit for communicating a hydraulic pump disposed outside the conduit with a bearing cavity in the suspension bearing system.
In some embodiments, the fluid inlet of the hydraulic pump is further provided with a filtering device.
Another aspect of the embodiments of the present invention provides a control method of the rim thruster, including:
synchronously starting a motor and a hydraulic pump, controlling the hydraulic pump to pressurize a bearing cavity in the suspension bearing system, and enabling the second annular element and the rotor to integrally move in the axial direction under the action of pressure so as to enable the suspension distance of the first annular element and the second annular element in the axial direction to be within a set numerical range;
the suspension distance of the first annular piece and the second annular piece in the axial direction is detected by a position monitoring mechanism, if the suspension distance is within a set numerical range, the pressure in a stable bearing cavity of a hydraulic pump is controlled, if the suspension distance is smaller than a lower limit value of the set numerical range, the hydraulic pump is controlled to increase the pressure, the second annular piece and the rotor are enabled to move integrally in the axial direction, so that the suspension distance is increased to enter the set numerical range, and if the suspension distance is larger than an upper limit value of the set numerical range, the hydraulic pump is controlled to decrease the pressure, so that the second annular piece and the rotor are enabled to move reversely in the axial direction under the thrust action of a propeller, and the suspension distance is decreased to enter the set numerical range.
In some embodiments, the control method comprises: when the integral rotating speed of the second annular body and the rotor is increased, the pressure in the bearing cavity is controlled to be synchronously increased by the hydraulic pump, and when the integral rotating speed of the second annular body and the rotor is reduced, the pressure in the bearing cavity is controlled to be synchronously reduced by the hydraulic pump.
Another aspect of an embodiment of the present invention also provides a ship including a hull, and the rim thruster is further mounted on the hull.
When the suspension bearing provided by the above embodiment of the invention is used, fluid such as water is injected into the bearing cavity through an external hydraulic pump and the like to pressurize, so that the bearing rotor ring (the second ring element) and the bearing stator ring (the first ring element) in the bearing cavity can be separated in a suspension manner, the bearing is separated from direct friction during operation, and the friction loss is greatly reduced, so that the generated thrust is larger and the efficiency is higher under the same power.
When the suspension bearing provided by the embodiment of the invention is used, the flow velocity of the gap flow channel is increased due to the water pressure in the bearing cavity, the gap flow channel comprises the radial friction part of the bearing and the radial gap between the stator and the rotor of the motor, and the heat generated by the friction of the bearing and the heat generated by the motor are taken away by the water flow when the equipment runs, so that the heat radiation performance of the device is greatly improved.
When the suspension bearing provided by the embodiment of the invention is applied to equipment such as an underwater shaftless rim propeller and the like, the influence caused by larger thrust generated in the axial direction when the propeller operates can be weakened or offset, so that the equipment is separated from solid friction when operating, the vibration and noise are greatly reduced, the problem that the existing bearing cannot separate from the solid friction to generate larger vibration and noise when transmitting large thrust is solved, and the suspension bearing has wide prospects in the civil market and the military field.
When the suspension bearing provided by the embodiment of the invention is used, an external hydraulic pump can be adopted to supply water, and the filter device is additionally arranged at the water inlet of the water inlet pipeline, so that larger hard particles can be prevented from entering the bearing, and the running reliability of the system is improved.
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, a suspension bearing according to an exemplary embodiment of the present invention includes a bearing stator ring 2 (i.e., the first ring member) and a bearing rotor ring 3 (i.e., the second ring member), wherein the bearing rotor ring 3 is in a "convex" shape, an annular protrusion 11 (i.e., the annular protrusion) is formed on an outer wall of the bearing rotor ring, the bearing stator ring 2 is in a "concave" shape, an annular groove 10 (i.e., the annular recess) is formed on an inner wall of the bearing stator ring, a radial gap and an axial gap exist when the annular groove 10 is matched with the annular protrusion 11, and a semi-closed annular pressure cavity 11 (defined as a bearing cavity) is formed therebetween. By injecting water (or other fluid) into the bearing cavity 12 and pressurizing the water to a predetermined value, the bearing stator ring 2 and the bearing rotor ring 3 can be separated in a floating manner in the axial direction, and a small gap is formed in the radial direction, so that the floating bearing is separated from direct friction during operation, and friction loss is greatly reduced.
Referring to fig. 2 a-2 b, a plurality of pressure holes 9 may be formed in the bearing stator ring 2, and these pressure holes may be communicated with a hydraulic pump (not shown) through a hydraulic pipe 5 or its branches, and further communicated with the bearing cavity. By using the pressure holes and the hydraulic pump matched with the pressure holes, fluid such as water can be injected into the bearing cavity and the pressure in the bearing cavity can be regulated.
Further, the pressure holes 9 may be axially symmetrically distributed along the circumferential direction of the bearing stator ring 2.
Further, the pressure holes 9 may be opened on the bottom surface of the annular groove 10 of the bearing stator ring 2 and arranged uniformly in the circumferential direction.
Furthermore, in order to facilitate the sealing connection, the pressure hole 9 may be formed in a convex shape or a conical shape to fit the sealing ring.
Further, the structure of the pressure hole and the like can be adjusted according to actual requirements.
For example, the bore axis of the pressure bore 9 may be parallel to the axis of the suspension bearing. Alternatively, the bore axis of the pressure bore 9 may form an angle with the axis of the suspension bearing and be oriented in the circumferential direction of rotation of the bearing stator ring 2.
Furthermore, a plurality of threaded through holes can be uniformly arranged on the bottom surface of the groove of the bearing stator ring 2 along the circumferential direction, and are used for fixedly connecting the bearing stator ring 2 with other mechanisms (such as a conduit of a rim propeller and the like).
Wherein a plurality of fluid grooves may be provided on a radial wall surface of the annular boss of the bearing rotor ring 3.
Further, the fluid grooves extend in the direction of rotation of the bearing rotor ring 3.
Further, the fluid grooves are uniformly arranged in the circumferential direction.
Further, the fluid groove may have various configurations, for example, a spiral type or a parabolic type, and is not limited thereto.
Further, the axial sectional shape of the fluid groove may be a semicircle, a triangle, or a rectangle, and is not limited thereto.
For example, referring to fig. 3a, a spiral water groove 7 having a semicircular cross section may be formed on a radial wall surface of the annular boss 11 of the bearing rotor ring 3 according to a rotation direction of the bearing rotor ring. Alternatively, referring to fig. 3b, a spiral water tank 8 having a triangular cross section may be formed on the radial wall surface of the annular boss 11 of the bearing rotor ring 3 according to the rotation direction of the bearing rotor ring.
The fluid groove is utilized to enable high-pressure water flow and the like in the bearing cavity to form dynamic pressure water films more easily when flowing out from the radial clearance, so that the radial friction loss of the bearing is reduced, and the running reliability of the bearing is further improved.
Furthermore, a plurality of threaded through holes (not shown in the figure) can be arranged on the table surfaces at two sides of the annular boss 11 of the bearing rotor ring 3, and the threaded through holes are uniformly arranged in the circumferential direction and are used for fixedly connecting the bearing stator ring with a motor rotor and the like.
Furthermore, the shaft end face and the radial clearance surface of the suspension bearing can be coated with an anti-corrosion wear-resistant material and the like.
Wherein, a position sensor or the like can be further provided to monitor at least the levitation distance of the bearing stator ring 2 and the bearing rotor ring 3 in the axial direction in the levitation bearing.
Furthermore, the position sensor can be connected to a control unit, and the control unit can be connected to a hydraulic pump. When the suspension bearing works, the suspension distance of the bearing stator ring 2 and the bearing rotor ring 3 in the axial direction can be fed back in real time by using the position sensor, and then the working state of the hydraulic pump is adjusted by the control unit, so that the suspension distance is controlled in a proper range.
The suspension bearing provided by the embodiment of the invention has a simple structure, is convenient to install, can enable the rotor to be separated from axial direct friction when being connected with a guide pipe and the like when in use, reduces friction loss, simplifies a flow field in a gap, greatly reduces vibration and noise, increases the flow velocity of a radial gap flow channel of the whole system by water pressure in a bearing cavity, can obviously enhance the heat dissipation capacity of the bearing and a motor, and improves the operation reliability of the whole system.
Referring to fig. 1 again, an underwater shaftless rim propeller using the suspension bearing of the present embodiment includes a duct 1, a rim motor, a propeller 6, and the suspension bearing. And further may include a position sensor and a hydraulic pump. The guide pipe 1 can be connected with a ship body, a stator winding part of the motor is integrated in the guide pipe 1, a rotor magnetic steel part of the motor is integrated in a rotor 4 of the motor, propeller blades are installed at the ring center of the rotor 4, a bearing stator ring 2 is fixedly connected with the axial end face of the guide pipe 1, and a bearing rotor ring 3 is fixedly connected with the end face 4 of a rotor shaft. Two ends of the rotor are respectively and symmetrically provided with a suspension bearing. The position sensor is arranged on the inner side of the guide pipe and fixedly connected with the guide pipe 1, and the hydraulic pump is arranged in the ship body and connected with the hydraulic pipe 5. Still be equipped with filter equipment in the water inlet department of the inlet tube of hydraulic pump for prevent great stereoplasm particles such as silt from getting into the suspension bearing, further improve the reliability of system's operation.
Further, the position sensor may be fixed inside the rim type motor housing, and the specific installation position is determined by the type of the sensor and the detection manner thereof, which is not particularly limited by the present invention, since the rotor to be detected is a component which moves rotationally, it is recommended to use a non-contact sensor, but if a laser sensor is used, it is likely to be easy to fail or misjudge in a turbid underwater environment, and therefore an ultrasonic sensor is preferred in some embodiments of the present invention.
Furthermore, the hydraulic pipe is used for conveying high-pressure water flow output by the hydraulic pump to the bearing pressure cavity, the hydraulic pipe main pipeline is divided into a plurality of same branch pipelines after starting from the hydraulic pump, the number of the branches is consistent with that of the pressure holes, and the path layout of the branch pipelines is subject to actual conditions. The pipe layout shown in fig. 1 is only a preferred embodiment of the present invention, and the present invention is not limited to this embodiment, and may be implemented in various ways.
Furthermore, if the hydraulic pump is arranged in the cabin, vibration reduction and sound insulation treatment can be carried out according to the requirement.
Further, the hydraulic pump preferably has the characteristics of low power, low flow rate and high pressure. In addition, the output water flow pressure of the hydraulic pump is required to be stable, and large pulse fluctuation is avoided.
When the underwater shaftless rim propeller works, the rotor 4 can drive the bearing rotor ring 3 to rotate, axial thrust is generated through the propeller, in order to balance the axial thrust, the excessive abrasion between bearings is avoided, water is pumped from the outside through the hydraulic pump, high-pressure water flow is injected into a bearing cavity through the pressure hole through the hydraulic pipe 5, the bearing rotor ring 3 and the rotor 4 are pushed to move axially integrally in the bearing cavity under high pressure, a certain gap exists between the bearing rotor ring 3 and the bearing stator ring 2 in the axial direction, a non-contact suspension separation state is realized, the direct friction between the bearing rotor ring 3 and the bearing stator ring 2 is eliminated, the heating and the abrasion are greatly reduced (particularly in water with more silt, the silt can generate a grinding effect on the existing water lubrication bearing, the service life of the bearing is greatly shortened), and the problem of the bearing abrasion of the rim type motor in the water is solved, the bearing performance of the bearing is improved, the service life of the bearing is prolonged, the connection of large thrust transmission and high-rotating-speed moving parts is facilitated, the friction loss is greatly reduced, and therefore the motor generates larger thrust under the same power, the efficiency is higher, and the bearing has important significance in ship propulsion energy conservation.
And when the underwater shaftless rim propeller works, the flow velocity of a gap flow channel of the whole propeller is increased due to the water pressure in the bearing cavity, the gap flow channel comprises a radial gap between a bearing rotor ring and a bearing stator ring in the suspension bearing and a radial gap between a motor stator and a rotor, and when the device runs, water flow takes away heat generated by the friction of the bearing and heat generated by the motor, so that the heat dissipation performance of the device is greatly improved.
And when the underwater shaftless rim propeller works, the problem that the existing bearing cannot be separated from solid friction due to larger thrust generated in the axial direction when the motor operates, so that larger vibration and noise are generated can be solved, and the underwater shaftless rim propeller has wide application prospect in the civil market and the military field.
In this embodiment, a method of controlling the suspension bearing may include: synchronously starting the motor and the hydraulic pump, controlling the hydraulic pump to pressurize the bearing cavity, and enabling the bearing rotor ring 3 and the rotor 4 to integrally move in the axial direction of the bearing under the action of water pressure, so that the suspension distance (which can be defined as a bearing axial clearance value) of the bearing rotor ring 3 and the rotor 4 in the axial direction is within a preset interval (namely the set numerical interval);
further, referring to fig. 4, the control method further includes:
detecting the axial clearance value of the bearing by using the position sensor, and controlling a hydraulic pump to stabilize the pressure in a bearing cavity if the axial clearance value of the bearing is within a preset interval; when the axial clearance value of the bearing is smaller than the minimum value of the preset interval, the hydraulic pump is controlled to increase the pressure, so that the bearing rotor ring 3 and the rotor 4 are integrally moved in the axial direction of the bearing under the action of water pressure, and the axial clearance value of the bearing is increased to be within the preset interval. When the axial clearance value of the bearing is larger than the maximum value of the preset interval, the hydraulic pump is controlled to reduce the pressure, so that the bearing rotor ring 3 and the rotor 4 integrally move in the axial direction of the bearing in the opposite direction under the thrust action of the propeller, and the axial clearance value of the bearing is reduced to be in the preset interval.
Further, when the rotation speed of the whole of the bearing rotor ring 3 and the rotor 4 is increased, the pressure in the bearing cavity can be controlled to be synchronously increased according to a certain proportion by using a hydraulic pump, and when the rotation speed of the whole of the bearing rotor ring 3 and the rotor 4 is reduced, the pressure in the bearing cavity can be controlled to be synchronously reduced according to a certain proportion by using a hydraulic pump.
It should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and can include, for example, a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. Relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is directed to embodiments of the present invention, and it is understood that various modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention.

Claims (10)

1. A suspension bearing is characterized by comprising a first annular member and a second annular member which are matched with each other, wherein an annular concave part is formed on the first annular member, an annular convex part is formed on the second annular member, a semi-closed annular bearing cavity is formed between the annular convex part and the annular concave part in a matched mode, and when the fluid pressure in the bearing cavity reaches a set value, the first annular member and the second annular member are at least separated in a suspension mode in the axial direction.
2. The suspension bearing of claim 1, wherein: when the fluid pressure in the bearing cavity reaches a set value, a small gap exists between the first annular member and the second annular member in the radial direction; and/or the first annular piece and the second annular piece are coated with anti-corrosion and wear-resistant materials; and/or the second ring is free to rotate about the axis of the suspension bearing.
3. The suspension bearing of claim 2, wherein: a plurality of fluid grooves are distributed on the radial wall surface of the annular bulge part, and the fluid grooves extend along the rotating direction of the second annular piece; preferably, the fluid groove comprises a spiral groove or a parabolic groove; preferably, the plurality of fluid grooves are uniformly distributed along the circumferential direction; and/or more than one pressure hole is distributed on at least one of the first annular member and the second annular member, and the pressure holes are communicated with the bearing cavity and used for injecting fluid into the bearing cavity; and/or, the fluid comprises water.
4. The suspension bearing of claim 3, wherein: the axial cross-sectional shape of the fluid groove comprises a semicircle, a triangle or a rectangle; and/or the pressure hole is communicated with the hydraulic pump through a hydraulic pipe; and/or the pressure holes are multiple and axially symmetrically distributed along the circumferential direction of the first annular piece; and/or the pressure hole is arranged on the first annular piece, and the hole axis of the pressure hole is parallel to the axis of the suspension bearing, or an inclination angle is formed between the hole axis of the pressure hole and the axis of the suspension bearing and faces to the circumferential rotation direction of the second annular piece.
5. A suspension bearing system, comprising the suspension bearing of any of claims 1-4 and a position monitoring mechanism for monitoring at least the axial suspension distance between the first annular member and the second annular member of the suspension bearing, the position monitoring mechanism further being connected to a control unit, the control unit being connected to a hydraulic pump for regulating at least the fluid pressure in a bearing cavity in the suspension bearing.
6. The method of controlling a suspension bearing system of claim 5, comprising: and at least regulating and controlling the fluid pressure in a bearing cavity in the suspension bearing by using a hydraulic pump to enable the second annular piece to move relative to the first annular piece in the axial direction, so that the suspension distance between the first annular piece and the second annular piece in the axial direction is within a set numerical range.
7. A rim propeller is characterized by comprising the suspension bearing system, a guide pipe, a motor and a propeller, wherein a first annular part in the suspension bearing system is fixedly connected with the axial end face of the guide pipe, a stator and a rotor of the motor are respectively and fixedly connected with the guide pipe and a second annular part, and blades of the propeller are further installed at the ring center of the rotor.
8. Rim thruster according to claim 7, characterized in that: the winding part of the stator is integrally arranged in the conduit; and/or, a motor rotor magnetic steel part is integrated in the rotor; and/or, a second annular piece is symmetrically distributed at two ends of the rotor; and/or a position monitoring mechanism in the suspension bearing system is fixedly arranged on the inner side of the guide pipe; and/or a hydraulic pipe is arranged in the guide pipe and is used for communicating a hydraulic pump arranged outside the guide pipe with a bearing cavity in the suspension bearing system; and/or wherein the fluid inlet of the hydraulic pump is further provided with a filtering device.
9. A method of controlling a rim thruster according to claim 7 or 8, comprising:
synchronously starting a motor and a hydraulic pump, controlling the hydraulic pump to pressurize a bearing cavity in the suspension bearing system, and enabling the second annular element and the rotor to integrally move in the axial direction under the action of pressure so as to enable the suspension distance of the first annular element and the second annular element in the axial direction to be within a set numerical range;
detecting the suspension distance of the first annular piece and the second annular piece in the axial direction by using a position monitoring mechanism, controlling a hydraulic pump to stabilize the pressure in a bearing cavity if the suspension distance is within a set numerical range, controlling the hydraulic pump to increase the pressure if the suspension distance is smaller than the lower limit value of the set numerical range, so that the second annular piece and the rotor integrally move in the axial direction to increase the suspension distance into the set numerical range, and controlling the hydraulic pump to decrease the pressure if the suspension distance is larger than the upper limit value of the set numerical range, so that the second annular piece and the rotor integrally move in the axial direction in a reverse direction under the thrust of a propeller to decrease the suspension distance into the set numerical range;
preferably, when the rotating speed of the second annular body and the rotor is integrally increased, the pressure in the bearing cavity is controlled to be synchronously increased by the hydraulic pump, and when the rotating speed of the second annular body and the rotor is integrally reduced, the pressure in the bearing cavity is controlled to be synchronously reduced by the hydraulic pump.
10. A ship comprising a hull, characterized in that: a rim thruster according to claim 7 or 8 is also mounted on the hull.
CN202011480241.2A 2020-12-15 2020-12-15 Suspension bearing, control method and application thereof Pending CN114635920A (en)

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CN107499487A (en) * 2017-08-15 2017-12-22 武汉理工大学 Propulsion and generating integration device are driven to runner edge based on shaftless
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CN110925309A (en) * 2018-09-19 2020-03-27 武汉科技大学 Air bearing with active control of air film shape
CN111439362A (en) * 2020-04-27 2020-07-24 广州海工船舶设备有限公司 Annular electric propeller supported by magnetic-liquid composite suspension bearing
CN113511322A (en) * 2021-05-24 2021-10-19 江苏科技大学 Shaftless propeller silt-prevention device based on multi-silt channel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5381855A (en) * 1976-12-27 1978-07-19 Hitachi Ltd Bearing for bounding horn
CN101413540A (en) * 2007-10-15 2009-04-22 中国科学院工程热物理研究所 Kinetic pressure air-float bearing of inner flow passage self-lubricating structure
WO2009056123A2 (en) * 2007-11-02 2009-05-07 Schaeffler Kg Bearing arrangement for a bearing
CN101546931A (en) * 2009-04-28 2009-09-30 中国船舶重工集团公司第七一二研究所 Integrated propeller
CN101550966A (en) * 2009-05-14 2009-10-07 湖南普来得机械技术有限公司 Aqueous suspension bearings
JP2011005926A (en) * 2009-06-25 2011-01-13 Kawasaki Heavy Ind Ltd Thrust generator
ES2429241B1 (en) * 2012-04-20 2014-12-23 Universidade Da Coruña FLUID LEVITATION BEARING.
WO2014081901A1 (en) * 2012-11-20 2014-05-30 New Way Machine Components, Inc. Air bearing for use as seal
CN104333172A (en) * 2014-10-18 2015-02-04 无锡德林船舶设备有限公司 Ship-used permanent magnet motor propeller
CN105109650A (en) * 2015-09-15 2015-12-02 武汉理工大学 Oppositely-rotating shaft-less rim-driven propeller
CN107499487A (en) * 2017-08-15 2017-12-22 武汉理工大学 Propulsion and generating integration device are driven to runner edge based on shaftless
CN108302121A (en) * 2018-04-13 2018-07-20 广州航海学院 A kind of tilting bush sliding bearing
CN110925309A (en) * 2018-09-19 2020-03-27 武汉科技大学 Air bearing with active control of air film shape
CN111439362A (en) * 2020-04-27 2020-07-24 广州海工船舶设备有限公司 Annular electric propeller supported by magnetic-liquid composite suspension bearing
CN113511322A (en) * 2021-05-24 2021-10-19 江苏科技大学 Shaftless propeller silt-prevention device based on multi-silt channel

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