CN114593085B - Long-life temperature control pump system adopting space suspension bearing - Google Patents
Long-life temperature control pump system adopting space suspension bearing Download PDFInfo
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- CN114593085B CN114593085B CN202210176069.4A CN202210176069A CN114593085B CN 114593085 B CN114593085 B CN 114593085B CN 202210176069 A CN202210176069 A CN 202210176069A CN 114593085 B CN114593085 B CN 114593085B
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- inner ring
- space suspension
- pump system
- suspension bearing
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- 239000000725 suspension Substances 0.000 title claims abstract description 68
- 230000001050 lubricating effect Effects 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000005299 abrasion Methods 0.000 claims abstract description 6
- 210000004907 gland Anatomy 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 238000005461 lubrication Methods 0.000 claims description 5
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims 2
- 238000005096 rolling process Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000005484 gravity Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 230000003068 static effect Effects 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/047—Bearings hydrostatic; hydrodynamic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
- F04D13/0626—Details of the can
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/06—Lubrication
- F04D29/061—Lubrication especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
- F04D29/5886—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling by injection
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Based on the characteristic of no gravity of the space environment, a long-life temperature control pump system adopting a space suspension bearing is provided, and the long-life temperature control pump system comprises a pump body (1), a shaft end nut (2), an impeller (3) and a motor; the motor adopts a front space suspension bearing (6) and a rear space suspension bearing (7), and adopts a mode of combining a large circulation of a cooling lubricating medium with a small circulation of the cooling lubricating medium, so that heat generated in the temperature control pump can be sufficiently taken away, and the space suspension bearings are sufficiently lubricated so as to form a lubricating film; the friction and abrasion of physical contact can not occur when the temperature control pump system is operated, the restriction of the service life of the temperature control pump caused by the service life of the rolling bearing can be solved, and the on-orbit service life of the spacecraft is prolonged.
Description
Technical Field
The invention belongs to the technical field of temperature control pumps of space aircrafts, and relates to a temperature control pump system.
Background
The space temperature control system (hereinafter referred to as temperature control system) is a system for controlling the temperature of a space station, a satellite and other spacecrafts, and directly determines the service life of the spacecrafts. The temperature control pump is the only power source of the temperature control system, and the service life of the temperature control pump directly determines the service life of the whole temperature control system, so that the on-orbit service life of the spacecraft is influenced.
When the temperature control pump is in a state of working all the time when in rail, if a rolling bearing is adopted, the rolling bearing is limited by materials, the rolling bearing can generate frictional wear with physical contact, and after continuous long-time operation, the bearing can fail, and the service life is often only about a few years. At present, the spacecraft is developing towards the long-life direction, so that the problem of long-life operation of the temperature control pump is solved, and the method has important research significance for prolonging the on-orbit service life of the spacecraft.
Disclosure of Invention
The invention aims to solve the technical problems that: based on the characteristic that space environment has no gravity, a long-life temperature control pump system adopting a space suspension bearing is provided, and the temperature control pump can not generate friction and abrasion of physical contact during operation, so that the limitation of the service life of the temperature control pump caused by the service life of a rolling bearing can be solved, and the on-orbit service life of a spacecraft is prolonged.
The technical scheme adopted by the invention is as follows: a long-life temperature control pump system adopting a space suspension bearing comprises a pump body, a shaft end nut, an impeller and a motor;
the motor comprises a bearing gland, a front sealing ring, a front space suspension bearing, a rear sealing ring, a rear end cover, a shielding sleeve, a rear bearing snap ring, a Hall shell, a rear cover plate, an electric connector, an adjusting pad, a stator, a rotating speed sensor and a rotating shaft;
the two ends of the rotating shaft are respectively arranged in the shielding sleeve through a front space suspension bearing and a rear space suspension bearing, the ports at the two ends of the shielding sleeve are respectively provided with a bearing gland and a rear bearing snap ring, the bearing gland is matched with the front space suspension bearing, and the rear bearing snap ring is matched with the rear space suspension bearing; the shaft end nut penetrates through the central hole of the impeller to mount the impeller at the end part of the rotating shaft, the root of the impeller is inserted into the central hole of the bearing gland, and a gap is reserved between the outer wall of the root of the impeller and the inner wall of the central hole of the bearing gland; one end part of the rotating shaft, provided with the rear space suspension bearing, is provided with a rotating speed sensor; the two sides of the front space suspension bearing are adjusted to be positioned between the middle section of the rotating shaft and the end part of the impeller through adjusting pads; the rear space suspension bearing adjusts the position between the middle section of the rotating shaft and the rotating speed sensor through an adjusting pad; the stator of the motor is arranged on the shielding sleeve, one end of the stator is limited by a flange plate at the large end of the shielding sleeve, the other end of the stator is connected with the rear end cover, and one end of the shielding sleeve, provided with the rear bearing snap ring, is inserted into the rear end cover; the electric connector is arranged on the Hall shell;
the pump body is connected with the stator of the motor and the shielding sleeve, and two front sealing rings are adopted between the port of the pump body and the outer wall of the shielding sleeve; the Hall shell is connected with the rear end cover, and the rear end cover is sealed with the shielding sleeve through two rear sealing rings; the rear cover plate is fixed on the Hall shell; the rotation speed sensor is used for feeding back rotation speed signals.
The shaft end nut is provided with an inclined through hole around the circumference;
the front space suspension bearing comprises a front bearing outer ring and a front bearing inner ring;
the front bearing outer ring is of a stepped cylindrical structure, the large-end cylinder is longitudinally removed with material on the circumferential outer wall surface to form a plurality of tangential planes, and each tangential plane is uniformly distributed along the circumferential direction of the large-end cylinder and is matched with the inner wall of the shielding sleeve to be used as a flow through groove; grooves matched with the bearing gland are symmetrically arranged on the end face of the large end and are used for fixing the circumferential position; 10-20 pressure-bearing grooves which are spirally distributed are uniformly engraved on the end face of the small end, the pressure-bearing grooves are designed according to the axial force in the temperature control pump, the curve form of the pressure-bearing grooves is a Cartesian coordinate curve form, and the depth of the pressure-bearing grooves is 5-50 mu m; 4-10 radial through holes are uniformly formed in the wall of the small-end cylinder around the circumferential direction and used for flowing in a lubricating medium;
the front bearing inner ring comprises a cylindrical section and a disc; the front bearing inner ring is provided with a central hole along the central shaft, 20-40 bearing grooves are symmetrically engraved on two sides of the outer surface of the cylindrical section respectively, the bearing grooves on one side are spirally distributed, and the bearing shafts on two sides are opposite in rotation direction; the projection of the curve of the pressure-bearing groove on the longitudinal section along the central axis of the cylindrical section is splayed; the depth of the pressure-bearing groove is designed according to the radial force, and the value range is 5-50 mu m; an annular circular groove with the depth of 0.1-0.5mm is formed at the position where the cylindrical section is connected with the disc and is used for inflow lubrication of a lubricating medium; 2-4 radial through holes are uniformly formed on the bottom surface of the annular circular groove around the circumferential direction;
the inner circular surface of the outer ring of the front bearing is in clearance fit with the outer circular surface of the cylindrical section of the inner ring of the front bearing, the fit clearance is about 10-30 mu m, the small end face of the bearing groove carved on the outer ring of the front bearing is in clearance fit with the disc end face of the inner ring of the front bearing, the fit clearance is about 10-30 mu m, and the specific numerical value of the clearance is designed according to the specific performance of the temperature control pump.
The rear space suspension bearing comprises a rear bearing outer ring and a rear bearing inner ring; the whole structure of the rear bearing outer ring is cylindrical, materials are removed on the outer wall surface along the longitudinal direction to form a plurality of through-flow grooves, the through-flow grooves are uniformly distributed along the circumferential direction of the outer wall surface, gaps are respectively arranged at two ends of each through-flow groove, and the gaps are in embedded fit with the end surfaces of the rear bearing snap rings to prevent the rear bearing outer ring from circumferential rotation and axial movement; the rear bearing inner ring comprises an outer layer cylinder and an inner layer cylinder, a plurality of pressure-bearing grooves are symmetrically engraved on two sides of the outer wall surface of the outer layer cylinder, the pressure-bearing grooves on one side are spirally distributed, and the pressure-bearing shafts on two sides are opposite in rotation direction; the projection of the curve of the pressure-bearing groove on the longitudinal section along the central axis of the cylindrical section is splayed, and the depth of the pressure-bearing groove is designed according to Wen Kongbeng radial force, and the range is 5-50 mu m; the inner layer cylinder is coaxial with the outer layer cylinder, and the end part of the inner layer cylinder is connected with the inner wall of the outer layer cylinder through a radial partition plate.
The shielding sleeve is made of high-strength titanium alloy materials, so that the medium and the stator are isolated, the medium is prevented from flowing into the stator, the flange is arranged on the outer wall of the large end of the shielding sleeve, the large end of the shielding sleeve is uniformly provided with inclined holes with different numbers in the circumferential direction, and the included angle formed by the inclined holes and the horizontal line is about 10 degrees, so that the medium can flow in conveniently.
The rotating shaft is in interference fit or key fit with the front bearing inner ring and the rear bearing inner ring; 2-4 radial through holes are formed in the position, around the circumferential direction, of the rotating shaft, matched with the front bearing inner ring, the number of the radial through holes of the rotating shaft is consistent with that of the through holes in the annular groove of the front bearing inner ring, and the positions of the radial through holes are corresponding to those of the through holes in the annular groove of the front bearing inner ring; the rotating shaft is hollow and is provided with a central hole along the central shaft.
The adjusting pad is used for adjusting the fit clearance among all parts.
Compared with the prior art, the invention has the advantages that:
(1) The invention adopts the space suspension bearing carved with the pressure-bearing groove to replace the traditional rolling bearing, ensures that the rotating part and the static part do not generate direct contact in the running process of the temperature control pump, and has no mechanical friction and abrasion, thereby realizing long service life.
(2) According to the space suspension bearing, the pressure-bearing groove structure is controlled by adopting a special formula, so that the pressure-bearing groove structure can ensure that a medium can form a lubricating film in a space gravity-free environment in an extrusion mode, the problem that a reliable oil film cannot be formed under the gravity-free condition of the traditional bearing is solved, and the temperature control pump can normally operate in the space gravity-free environment.
(3) The temperature control pump structure adopts a mode of combining the large circulation of the cooling lubricating medium with the small circulation of the cooling lubricating medium, can fully take away the heat generated in the temperature control pump, fully lubricate the space suspension bearing and is beneficial to forming a lubricating film.
(4) The left side of the shielding sleeve is provided with the inclined hole which forms about 10 degrees with the horizontal direction, so that a medium can flow into the motor more easily to be lubricated and cooled.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a temperature control pump according to the present invention.
Fig. 2 is a schematic diagram of a space suspension bearing structure in front of a temperature control pump and a working principle thereof.
Fig. 3 is a schematic diagram and a structure of a front bearing outer ring of a temperature control pump according to the present invention.
Fig. 4 is a schematic diagram and a structure of an inner ring of a front bearing of a temperature control pump according to the present invention.
Fig. 5 is a schematic diagram of a rear space suspension bearing structure and operation of the temperature control pump provided by the invention.
Fig. 6 is a diagram of the rear bearing outer ring of the temperature control pump.
Fig. 7 is a schematic diagram and a structure of a rear bearing inner ring of a temperature control pump according to the present invention.
Fig. 8 is a block diagram of a shielding sleeve of a temperature control pump according to the present invention.
Fig. 9 is a circuit diagram of cooling lubricating medium circulation of the temperature control pump provided by the invention.
Fig. 10 is a graph of the curve function of the bearing groove of the front bearing outer ring of the temperature control pump.
FIG. 11 is a graph showing the curve function of the bearing groove of the front bearing inner ring of the temperature control pump.
Detailed Description
The left side, right side, upper side, lower side, horizontal, vertical and other azimuth nouns are all based on the direction of the picture in the text, and are only for convenience of description and do not limit the real object.
As shown in fig. 1, the long-life temperature control pump system adopting the space suspension bearing is composed of a pump body 1, a shaft end nut 2, an impeller 3 and a motor part, wherein the motor part comprises a bearing gland 4, a front sealing ring 5, a front space suspension bearing 6, a rear space suspension bearing 7, a rear sealing ring 8, a rear end cover 9, a shielding sleeve 10, a rear bearing clamping ring 11, a hall shell 12, a rear cover plate 13, an electric connector 14, an adjusting pad 15, a stator 16, a rotating speed sensor 17 and a rotating shaft 18.
The two ends of the rotating shaft 18 are respectively arranged in the shielding sleeve 10 through the front space suspension bearing 6 and the rear space suspension bearing 7, the ports at the two ends of the shielding sleeve 10 are respectively provided with a bearing cover 4 and a rear bearing snap ring 11, the bearing cover 4 is matched with the front space suspension bearing 6, and the rear bearing snap ring 11 is matched with the rear space suspension bearing 7; the shaft end nut 2 penetrates through the central hole of the impeller 3 to mount the impeller 3 at the end part of the rotating shaft 18, the root of the impeller 3 is inserted into the central hole of the bearing gland 4, and a gap is reserved between the outer wall of the root of the impeller 3 and the inner wall of the central hole of the bearing gland 4; the rotating shaft 18 is provided with a rotating speed sensor 17 at one end part of the rear space suspension bearing 7; the positions between the two sides of the front space suspension bearing 6 and the middle section of the rotating shaft 18 and the end part of the impeller 3 are adjusted through the adjusting pads 15; the rear space suspension bearing 7 is adjusted to be positioned between the middle section of the rotating shaft 18 and the rotating speed sensor 17 through an adjusting pad 15; the stator 16 of the motor is arranged on the shielding sleeve 10, one end of the stator is limited by a flange plate at the large end of the shielding sleeve 10, the other end of the stator is connected with the rear end cover 9, and one end of the shielding sleeve 10 provided with the rear bearing snap ring 11 is inserted into the rear end cover 9; an electrical connector 14 is mounted on the hall shell 12.
As shown in fig. 2, the front space suspension bearing 6 is composed of a front bearing outer ring 6a and a front bearing inner ring 6 b. As shown in fig. 3, the front bearing outer ring 6a has a generally cylindrical shape with a large left side diameter and a small right side diameter, and is formed with a flow-through groove formed by removing material from the circumferential outer wall surface; the left end face is removed with material, and the recessed position of the left end face is engaged with the bearing cover 4 (as shown in fig. 1) for fixing the circumferential position against rotation. 10-20 pressure-bearing grooves are uniformly engraved on the right end face, the pressure-bearing grooves are designed according to the axial force in the temperature control pump, the curve form of the pressure-bearing grooves is a Cartesian coordinate curve form, as shown in FIG. 10, the equation in the first coordinate system is as follows:
the origin O of the first coordinate system is positioned at the center of a center hole of the cross section of the front bearing outer ring 6a, and the OXY plane is any cross section of the front bearing outer ring 6 a; x and Y are coordinates on an X axis and a Y axis in FIG. 10, theta is an included angle between a point on a pressure-bearing groove curve and the X axis, R is the radius of the outermost side of the pressure-bearing groove, B is the width of the pressure-bearing groove along the radial direction, and a is an included angle between the tangential direction of the pressure-bearing groove curve and an origin coordinate connecting line; the depth of the pressure-bearing groove is varied from 5 μm to 50 μm. 4-10 through holes are uniformly formed in the circumferential direction of the cylinder with the small diameter on the right side and used for flowing in a lubricating medium;
the structure of the front bearing inner ring 6b is shown in fig. 4, the whole bearing inner ring is similar to a T shape, 20-40 bearing grooves are carved on two sides of the outer surface of a cylinder with smaller diameter on the left side, the curve form of the bearing grooves is the projection of an eight-shaped straight line on a plane to the cylinder (the eight-shaped straight line is shown as a broken line in fig. 11), and the equation in the second coordinate system is as follows: the OXY plane of the second coordinate system is a longitudinal section along the central axis of the cylindrical section of the front bearing inner ring 6b, the circle center is positioned at the central point of the longitudinal section, the X axis is along the central axis, and the Y axis is vertical to the X axis;
wherein X, Y are the coordinates on the X axis and the Y axis respectively; beta is an included angle between the splayed straight line and the vertical direction, S is the width of the single-side pressure-bearing groove, and L is the distance between the left-side pressure-bearing groove and the right-side pressure-bearing groove;
the depth of the pressure-bearing groove is designed according to the radial force and is in a range of 5-50 μm. An annular circular groove 19 with the depth of 0.1-0.5mm is formed near the root of the large-diameter disc and is used for inflow lubrication of a lubricating medium; the annular circular groove 19 is uniformly provided with 2 to 4 through holes. The assembly of the front bearing outer ring 6a and the front bearing inner ring 6b is shown in fig. 2, the inner circular surface of the front bearing outer ring 6a and the outer circular surface of the front bearing inner ring 6b are in clearance fit, the fit clearance is about 10-30 μm, the right side end surface of the front bearing outer ring 6a carved with the pressure-bearing groove is in clearance fit with the left side end surface of the disc of the front bearing inner ring 6b, the fit clearance is about 10-30 μm, and the specific value of the clearance is designed according to the specific performance of the temperature control pump.
As shown in fig. 5, the rear space suspension bearing 7 is composed of a rear bearing outer ring 7a and a rear bearing inner ring 7 b. As shown in fig. 6, the rear bearing outer ring 7a has a cylindrical overall structure, and has a circumferential outer wall surface from which a material is removed and a groove formed in the left and right end surfaces from which a material is removed. As shown in fig. 1, the left end of the rear bearing snap ring 11 is embedded into the recessed position, preventing the rear bearing outer ring 7a from circumferential rotation and axial play; as shown in fig. 7, the rear bearing inner ring 7b is symmetrically engraved with pressure-bearing grooves (the pressure-bearing grooves are identical to the front bearing inner ring 6b in form and are the projections of the eight-shaped straight line on a plane to the cylinder), and the depth of the pressure-bearing grooves is designed according to the Wen Kongbeng radial force and is in the range of 5 μm-50 μm. The interior is designed into an L shape, and the design concept of lightweight aerospace products is fully considered.
As shown in fig. 8, the shielding sleeve 10 is made of a high-strength titanium alloy material, so as to isolate a medium from the stator 16, prevent the medium from flowing into the stator 16, and have a different number of inclined holes 101 in the circumferential direction on the left side of the shielding sleeve 10, wherein the inclined holes 101 form an included angle of about 10 ° with a horizontal line, so that the medium can flow in conveniently.
As shown in fig. 1, the shaft 18 is in interference fit or key fit with the front bearing inner ring 6b and the rear bearing inner ring 7 b. At the position matched with the front bearing inner ring 6b, 2-4 through holes are formed in the circumferential direction of the rotating shaft, the number of the through holes is consistent with that of the through holes in the annular groove of the front bearing inner ring 6b, and the through holes are in one-to-one correspondence. The rotary shaft 18 is hollow and has a center hole penetrating the left and right sides. The adjusting pad 15 is used for adjusting the fit clearance between the parts.
The pump body 1 is connected with the stator 16 and the shielding sleeve 10 of the motor in a screw fixing mode, and the two front sealing rings 5 can effectively prevent the medium in the temperature control pump from leaking to the outside when the temperature control pump works. The rear end cover 9 is connected with the stator 16 in a screw fixing mode, the Hall shell 12 is connected with the rear end cover 9 in a screw connecting mode, and the two rear sealing rings 8 can effectively prevent medium in the pump from flowing into the stator 16 of the motor. The back cover 17 is secured to the hall shell 12 by means of a screw connection.
Working principle:
as shown in fig. 1, the temperature control pump is powered by the electric connector 14, the rotating shaft 18 drives the rotating parts such as the impeller 3 to rotate, acting on the medium, and most of the medium flows in from the medium inlet on the pump body 1, and flows out from the outlet on the pump body 1 with a certain pressure, so that the medium flows out.
Part of the medium flows into the motor for cooling and lubrication, and the medium flow paths are shown by gray arrows and black arrows in fig. 9, wherein the gray arrows circulate as small cooling medium circulation, and the black arrows circulate as large cooling medium circulation.
In the cooling and lubricating medium small circulation, the medium first flows through the gap between the impeller 3 and the bearing cover 4 to the front space suspension bearing 6. Here, the medium flows into the gap between the front bearing outer ring 6a and the front bearing inner ring 6B through the paths a, B, respectively, in the arrow direction in fig. 2, enters the bearing groove, is blocked by the tail of the bearing groove to form a high pressure region (as shown in fig. 3 and 4), thereby forming a lubrication film that separates the front bearing outer ring 6a and the front bearing inner ring 6B from each other, and no frictional wear of physical contact occurs. The redundant medium flows into small holes in the circumferential direction of the rotating shaft 18 through small holes in the annular circular groove 19 of the front bearing inner ring 6b, flows leftwards from the central hole of the rotating shaft 18, passes through holes in the circumferential direction of the shaft end nut 2 and returns to the impeller 3.
In the cooling and lubricating medium large circulation, the medium passes through the inclined holes of the shielding sleeve 10, continuously flows to the right along the cavity between the rotating shaft 18 and the shielding sleeve 10, and flows to the rear space suspension bearing 7. Here, a part of the medium flows into the gap between the rear bearing outer ring 7a and the rear bearing inner ring 7b through the path C in the arrow direction in fig. 5, enters the pressure-bearing groove, is blocked by the tail of the pressure-bearing groove to form a high pressure area (as shown in fig. 7), thereby forming a lubricating film, separating the rear bearing inner ring 7b from the rear bearing outer ring 7a, and does not generate frictional wear in physical contact; the other part of the medium flows into the rightmost side of the rotating shaft 18 through the flow groove of the rear bearing outer ring 7a, flows into the shaft end nut 2 through the central hole in the rotating shaft 18, and returns through the hole in the circumferential direction of the shaft end nut 2.
In the whole temperature control pump, the rotating parts comprise a shaft end nut 2, an impeller 3, a rotating shaft 18, a front bearing inner ring 6b, a rear bearing inner ring 7b, an adjusting pad 15 and the rest parts are static parts. The rotating part and the static part are separated by a lubricating film formed on the surface of the pressure-bearing groove, so that no mechanical contact exists, no friction and abrasion are generated, and the device is suitable for space gravity-free environments. And the mode of combining the large circulation of the cooling lubricating medium with the small circulation of the cooling lubricating medium is adopted in the temperature control pump, so that heat generated in the temperature control pump can be fully taken away, the space suspension bearing is fully lubricated, and the formation of a lubricating film is facilitated. Therefore, the whole temperature control pump has the advantage of long service life, and the on-orbit service life of the spacecraft can be prolonged.
The invention, in part not described in detail, is within the skill of those skilled in the art.
Claims (16)
1. The long-life temperature control pump system adopting the space suspension bearing is characterized by comprising a pump body (1), a shaft end nut (2), an impeller (3) and a motor;
the motor comprises a bearing gland (4), a front space suspension bearing (6), a rear space suspension bearing (7), a rear end cover (9), a shielding sleeve (10), a rear bearing snap ring (11), a Hall shell (12), a rear cover plate (13), an electric connector (14), a stator (16), a rotating speed sensor (17) and a rotating shaft (18);
two ends of a rotating shaft (18) are respectively arranged in a shielding sleeve (10) through a front space suspension bearing (6) and a rear space suspension bearing (7), bearing covers (4) and rear bearing snap rings (11) are respectively arranged at two end ports of the shielding sleeve (10), the bearing covers (4) are matched with the front space suspension bearing (6), and the rear bearing snap rings (11) are matched with the rear space suspension bearing (7); the shaft end nut (2) penetrates through the central hole of the impeller (3) to mount the impeller (3) at the end part of the rotating shaft (18), and the root part of the impeller (3) is inserted into the central hole of the bearing gland (4); a rotating speed sensor (17) is arranged at one end part of the rotating shaft (18) at which the rear space suspension bearing (7) is arranged; the stator (16) is arranged on the shielding sleeve (10), one end of the stator is limited by a flange plate at the large end of the shielding sleeve (10), the other end of the stator is connected with the rear end cover (9), and one end of the shielding sleeve (10) provided with the rear bearing snap ring (11) is inserted into the rear end cover (9); the pump body (1) is connected with a stator (16) and a shielding sleeve (10) of the motor; the Hall shell (12) is connected with the rear end cover (9); the rear cover plate (13) is fixed on the Hall shell (12); an electrical connector (14) mounted on the hall housing (12); the rotating speed sensor (17) is used for feeding back rotating speed signals;
the front space suspension bearing (6) comprises a front bearing outer ring (6 a) and a front bearing inner ring (6 b);
the front bearing outer ring (6 a) is of a stepped cylindrical structure, the material is longitudinally removed from the large-end cylinder on the circumferential outer wall surface to form a plurality of tangential planes, and each tangential plane is uniformly distributed along the circumferential direction of the large-end cylinder and is matched with the inner wall of the shielding sleeve (10) to be used as a flow through groove; grooves matched with the bearing gland (4) are symmetrically arranged on the end face of the large end and are used for fixing the circumferential position; a plurality of pressure-bearing grooves which are spirally distributed are uniformly engraved on the end face of the small end; a plurality of radial through holes are uniformly formed on the wall of the small-end cylinder around the circumferential direction and used for flowing in a lubricating medium;
the front bearing inner ring (6 b) comprises a cylindrical section and a disc; the front bearing inner ring (6 b) is provided with a central hole along the central shaft, a plurality of pressure-bearing grooves are symmetrically engraved on two sides of the outer surface of the cylindrical section respectively, the pressure-bearing grooves on one side are spirally distributed, and the rotation directions of the pressure-bearing bearings on two sides are opposite; an annular circular groove (19) is formed in the position where the cylindrical section is connected with the disc and is used for inflow lubrication of a lubricating medium; the bottom surface of the annular circular groove (19) is uniformly provided with a plurality of radial through holes around the circumference.
2. A long life temperature controlled pump system employing a spatial suspension bearing according to claim 1, characterized in that the motor further comprises a front seal ring (5); two front sealing rings (5) are adopted between the port of the pump body (1) and the outer wall of the shielding sleeve (10).
3. A long life temperature controlled pump system employing a spatial suspension bearing according to claim 1, wherein the motor further comprises a rear seal ring (8); the rear end cover (9) and the shielding sleeve (10) are sealed by two rear sealing rings (8).
4. A long life temperature controlled pump system employing a spatial suspension bearing according to claim 1, wherein the motor further comprises an adjusting pad (15), both sides of the front spatial suspension bearing (6) are adjusted by the adjusting pad (15) to a position between a middle section of the rotating shaft (18) and an end of the impeller (3); the rear space suspension bearing (7) is adjusted to be at a position between the middle section of the rotating shaft (18) and the rotating speed sensor (17) through an adjusting pad (15).
5. A long life temperature controlled pump system employing a spatial suspension bearing according to claim 1, wherein the shaft end nut (2) is circumferentially open with inclined through holes.
6. The long-life temperature control pump system adopting the space suspension bearing according to claim 1, wherein the number of the pressure-bearing grooves on the small end face of the outer ring (6 a) of the front bearing is 10-20 according to the axial force in the temperature control pump, the curve form of the pressure-bearing grooves is Cartesian coordinate curve form, and the depth of the pressure-bearing grooves is 5-50 μm.
7. A long life temperature controlled pump system employing a space suspension bearing according to claim 6, wherein the number of radial through holes in the small end cylindrical wall of the front bearing outer ring (6 a) is 4-10.
8. The long-life temperature control pump system adopting the space suspension bearing according to claim 1, wherein the projection of the curves of the pressure-bearing grooves on the two sides of the cylindrical section of the front bearing inner ring (6 b) on the longitudinal section along the central axis of the cylindrical section is splayed, and the depth of the pressure-bearing grooves is designed according to the radial force and ranges from 5 μm to 50 μm.
9. A long life temperature controlled pump system employing a space suspension bearing according to claim 1, wherein the depth of the annular groove (19) is 0.1-0.5mm, and the number of radial through holes in the bottom surface of the annular groove is 2-4.
10. A long life temperature controlled pump system using space suspension bearing according to claim 1, characterized in that the inner circular surface of the front bearing outer ring (6 a) and the outer circular surface of the cylindrical section of the front bearing inner ring (6 b) are in clearance fit, the fit clearance is about 10-30 μm, the small end face of the front bearing outer ring (6 a) carved with pressure-bearing groove is in clearance fit with the disc end face of the front bearing inner ring (6 b), and the fit clearance is 10-30 μm.
11. A long life temperature controlled pump system employing a space suspension bearing according to claim 1, characterized in that the rear space suspension bearing (7) comprises a rear bearing outer ring (7 a), a rear bearing inner ring (7 b);
the rear bearing outer ring (7 a) is cylindrical, a plurality of through-flow grooves are formed in the outer wall surface by removing materials longitudinally, the through-flow grooves are uniformly distributed along the circumferential direction of the outer wall surface, gaps are respectively formed at two ends of each through-flow groove, and the gaps are in embedded fit with the end face of the rear bearing snap ring (11) to prevent the rear bearing outer ring (7 a) from circumferential rotation and axial movement;
the rear bearing inner ring (7 b) comprises an outer layer cylinder and an inner layer cylinder, a plurality of pressure-bearing grooves are symmetrically engraved on two sides of the outer wall surface of the outer layer cylinder, the pressure-bearing grooves on one side are spirally distributed, and the rotation directions of the pressure-bearing bearings on two sides are opposite; the inner layer cylinder is coaxial with the outer layer cylinder, and the end part of the inner layer cylinder is connected with the inner wall of the outer layer cylinder through a radial partition plate.
12. A long life temperature controlled pump system using space suspension bearings according to claim 11, characterized in that the curves of the bearing grooves on both sides of the rear bearing inner ring (7 b) are projected in a splayed shape on the longitudinal section along the central axis of the cylindrical section, the bearing groove depth is designed according to Wen Kongbeng radial force, ranging from 5 μm to 50 μm.
13. The long-life temperature control pump system adopting the space suspension bearing according to claim 11, wherein the shielding sleeve (10) is made of high-strength titanium alloy materials, a flange is arranged on the outer wall of the large end of the shielding sleeve (10) of the stator (16), and the large end of the shielding sleeve (10) is uniformly provided with a plurality of inclined holes (101) with different numbers in the circumferential direction.
14. A long life temperature controlled pump system employing a space suspension bearing according to claim 11, wherein the shaft (18) is in interference fit or key fit with the front bearing inner ring (6 b) and the rear bearing inner ring (7 b); 2-4 radial through holes are formed in the position, around the circumferential direction, of the rotating shaft (18) at the position matched with the front bearing inner ring (6 b), wherein the number of the radial through holes of the rotating shaft (18) is consistent with that of the through holes in the annular groove of the front bearing inner ring (6 b), and the positions of the radial through holes are corresponding to those of the through holes; the rotating shaft (18) is provided with a central hole along the central shaft.
15. A long life temperature controlled pump system employing a space suspension bearing according to claim 11, wherein a gap is left between the outer wall of the root of the impeller (3) and the inner wall of the central bore of the bearing gland (4).
16. The long-life temperature-controlled pump system using space suspension bearing according to any one of claims 11-15, characterized in that the electrical connector (14) supplies power to the motor, the rotating shaft (18) drives the impeller (3), the shaft end nut (2), the front bearing inner ring (6 b), the rear bearing inner ring (7 b) and the adjusting pad (15) to rotate, acting on the medium, the medium flows in from the medium inlet on the pump body (1), and a part of the medium flows out from the outlet on the pump body (1);
the other part of medium flows into the motor for cooling and lubricating to form a small circulation of cooling and lubricating medium and a large circulation of cooling and lubricating medium:
in the small circulation of the cooling and lubricating medium, the medium flows to the front space suspension bearing (6) through a gap between the impeller (3) and the bearing gland (4); at the moment, the medium enters the bearing groove along the radial through hole on the small-end cylinder of the front bearing outer ring (6 a) and the gap between the front bearing outer ring (6 a) and the front bearing inner ring (6 b) respectively, a high pressure area is formed by blocking the tail part of the bearing groove, a lubricating film is formed, and the lubricating film separates the front bearing outer ring (6 a) and the front bearing inner ring (6 b) and does not generate friction and abrasion with physical contact; the redundant medium flows into the radial through hole at the matching position of the rotating shaft (18) and the front bearing inner ring (6 b) through the radial through hole in the annular circular groove (19) of the front bearing inner ring (6 b), flows to the shaft end nut (2) from the central hole of the rotating shaft (18), and returns to the impeller (3) through the inclined through hole of the shaft end nut (2);
in the large circulation of the cooling and lubricating medium, the medium continuously flows into the rear space suspension bearing (7) along the cavity between the rotating shaft (18) and the shielding sleeve (10) through the inclined hole of the shielding sleeve (10) and flows to the rear space suspension bearing (7); at the moment, a part of medium flows into a gap between the rear bearing outer ring (7 a) and the rear bearing inner ring (7 b) and enters the pressure-bearing groove, a high pressure area is formed by blocking the tail part of the pressure-bearing groove, a lubricating film is formed, the rear bearing inner ring (7 b) and the rear bearing outer ring (7 a) are separated, and friction and abrasion with physical contact do not occur; the other part of medium flows through the flow groove of the rear bearing outer ring (7 a), flows to one end of the rotating shaft (18) where the rear bearing snap ring (11) is arranged, flows to the shaft end nut (2) through the central hole of the rotating shaft (18), and returns to the impeller (3) through the inclined through hole of the shaft end nut (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210176069.4A CN114593085B (en) | 2022-02-25 | 2022-02-25 | Long-life temperature control pump system adopting space suspension bearing |
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| CN202210176069.4A CN114593085B (en) | 2022-02-25 | 2022-02-25 | Long-life temperature control pump system adopting space suspension bearing |
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| CN114593085B true CN114593085B (en) | 2024-03-15 |
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| EP0771956A1 (en) * | 1995-11-06 | 1997-05-07 | KSB Aktiengesellschaft | Slide bearing for an engine-shaft |
| CN1274049A (en) * | 1999-05-14 | 2000-11-22 | 李世堃 | Magnetic suspension pump without shaft seal |
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|---|---|
| CN114593085A (en) | 2022-06-07 |
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