CN114593085A - 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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- CN114593085A CN114593085A CN202210176069.4A CN202210176069A CN114593085A CN 114593085 A CN114593085 A CN 114593085A CN 202210176069 A CN202210176069 A CN 202210176069A CN 114593085 A CN114593085 A CN 114593085A
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- 239000000725 suspension Substances 0.000 title claims abstract description 69
- 230000001050 lubricating effect Effects 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 210000004907 gland Anatomy 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 238000005299 abrasion Methods 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 4
- 238000005461 lubrication Methods 0.000 claims description 4
- 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
- 230000005484 gravity Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000002035 prolonged effect Effects 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
- 238000000034 method Methods 0.000 description 1
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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
-
- 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)
- Fluid Mechanics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Based on the characteristic of no gravity in a space environment, a long-life temperature control pump system adopting a space suspension bearing is provided, and 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 large circulation of a cooling and lubricating medium and small circulation of the cooling and lubricating medium, so that heat generated inside the temperature control pump can be fully taken away, and the space suspension bearing is fully lubricated to form a lubricating film; the friction wear of physical contact can not take place for the temperature control pump system when guaranteeing the operation, can solve the restriction of antifriction bearing life-span to the temperature control pump life-span, and then the in orbit of extension spacecraft is served the life-span.
Description
Technical Field
The invention belongs to the technical field of a temperature control pump of a space vehicle, and relates to a temperature control pump system.
Background
A space temperature control system (hereinafter referred to as a 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 service life of the spacecraft in orbit is influenced.
The temperature control pump is in a working state all the time when in orbit, if a rolling bearing is adopted, because of the limitation of materials, the ball bearings can generate friction and abrasion of physical contact, after the temperature control pump continuously runs for a long time, the bearing can lose efficacy, and the service life is often only about a few years. However, the current spacecraft is developing towards the direction of long service life, so that the problem of long service life operation of the temperature control pump is solved, and the spacecraft temperature control pump has important research significance for prolonging the service life of the spacecraft in orbit.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: based on the characteristic that the space environment has no gravity, the long-life temperature control pump system adopting the space suspension bearing is provided, the temperature control pump can not generate friction and abrasion of physical contact during operation, the restriction of the service life of a rolling bearing on the service life of the temperature control pump can be solved, and the service life of the spacecraft in orbit can be further 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;
two ends of the rotating shaft are respectively installed in the shielding sleeve through a front space suspension bearing and a rear space suspension bearing, two end ports of the shielding sleeve are respectively provided with a bearing cover and a rear bearing snap ring, the bearing cover 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 a central hole of the impeller to install 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; a rotating speed sensor is arranged at the end part of one end of the rotating shaft, which is provided with the rear space suspension bearing; the positions between the two sides of the front space suspension bearing and the middle section of the rotating shaft and the end part of the impeller are adjusted 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; a stator of the motor is arranged on a 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 a rear end cover, and one end of the shielding sleeve, which is provided with a 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 a 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 and the shielding sleeve are sealed through two rear sealing rings; the rear cover plate is fixed on the Hall shell; the rotating speed sensor is used for feeding back a rotating speed signal.
The shaft end nut is provided with an inclined through hole around the circumferential direction;
the front space suspension bearing comprises a front bearing outer ring and a front bearing inner ring;
the outer ring of the front bearing is of a stepped cylindrical structure, a large-end cylinder is longitudinally stripped on the circumferential outer wall surface to form a plurality of tangent planes, and each tangent 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 an overflow groove; the end face of the large end is symmetrically provided with grooves matched with the bearing gland and used for fixing the circumferential position; 10-20 pressure bearing grooves which are spirally distributed are uniformly carved 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 in the circumferential direction and used for flowing in a lubricating medium;
the front bearing inner ring comprises a cylindrical section and a disc; the inner ring of the front bearing is provided with a central hole along a central shaft, two sides of the outer surface of the cylindrical section are symmetrically carved with 20-40 bearing grooves respectively, the bearing grooves on one side are distributed spirally, and the bearing directions of the two sides are opposite; the projection of the curve of the pressure bearing groove on the longitudinal section along the central axis of the cylindrical section is in a splayed shape; 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 in 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 in the bottom surface of the annular circular groove in the circumferential direction;
the inner circle surface of the front bearing outer ring is in clearance fit with the outer circle surface of the cylindrical section of the front bearing inner ring, the fit clearance is about 10-30 mu m, the small end face of the front bearing outer ring, which is provided with the bearing groove, is in clearance fit with the disc end face of the front bearing inner ring, 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 rear bearing outer ring is cylindrical in integral structure, materials are longitudinally removed from the outer wall surface to form a plurality of overflow grooves, the overflow grooves are uniformly distributed along the circumferential direction of the outer wall surface, two ends of each overflow groove are respectively provided with a notch, and the notches and the end surface of the rear bearing snap ring form embedded matching to prevent the rear bearing outer ring from rotating in the circumferential direction and moving in the axial direction; the inner ring of the rear bearing comprises an outer layer cylinder and an inner layer cylinder, wherein a plurality of pressure bearing grooves are symmetrically carved 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 grooves on the two sides are opposite; 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 the radial force of the temperature control pump, and ranges from 5 micrometers to 50 micrometers; 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 partition plate along the radial direction.
The shielding sleeve is made of a high-strength titanium alloy material, and is used for isolating a medium from the stator and preventing the medium from flowing into the stator, the outer wall of the large end of the shielding sleeve is provided with a flange plate, the large end of the shielding sleeve is uniformly provided with inclined holes in different numbers in the circumferential direction, and the included angle formed by the inclined holes and a horizontal line is about 10 degrees, so that the medium can conveniently flow into the shielding sleeve.
The matching mode of the rotating shaft and the front bearing inner ring and the rear bearing inner ring is interference fit or key fit; 2-4 radial through holes are formed in the matching position of the rotating shaft and the front bearing inner ring in the circumferential direction, 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 radial through holes are corresponding in position; 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 space suspension bearing with the engraved pressure bearing groove is adopted to replace the traditional rolling bearing, so that the rotating part and the static part are not in direct contact and have no mechanical friction and wear in the operation process of the temperature control pump, and the long service life is realized.
(2) The space suspension bearing adopts a special formula to control the pressure-bearing groove structure, 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, and the problem that a reliable oil film cannot be formed under the gravity-free condition of the traditional bearing is solved, so that the temperature control pump can normally operate in the space gravity-free environment.
(3) The temperature control pump structure adopts a mode of combining large circulation of cooling and lubricating medium and small circulation of cooling and lubricating medium, can fully take away heat generated in the temperature control pump, fully lubricate a spatial 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 an angle of about 10 degrees with the horizontal direction, so that a medium can easily flow into the motor to be lubricated and cooled.
Drawings
Fig. 1 is a schematic view of the overall structure of a temperature-controlled pump according to the present invention.
Fig. 2 is a schematic diagram of a suspension bearing structure in front of a temperature control pump and a working principle thereof.
FIG. 3 is a schematic diagram of the outer ring structure of the front bearing of the temperature controlled pump according to the present invention.
FIG. 4 is a schematic diagram of the inner ring structure of the front bearing of the temperature controlled pump according to the present invention.
Fig. 5 is a schematic diagram of the rear space suspension bearing structure of the temperature controlled pump and the working principle thereof.
Fig. 6 is a structural diagram of a rear bearing outer ring of the temperature-controlled pump provided by the invention.
Fig. 7 is a schematic diagram of the inner ring structure of the rear bearing of the temperature-controlled pump according to the present invention.
Fig. 8 is a structural diagram of a shielding sleeve of a temperature-controlled pump according to the present invention.
Fig. 9 is a diagram of a cooling and lubricating medium circulation route of the temperature control pump provided by the invention.
FIG. 10 is a graph showing a function of a bearing groove curve of an outer ring of a front bearing of a temperature controlled pump according to the present invention.
FIG. 11 is a graph showing a function of a bearing groove curve of an inner ring of a front bearing of a temperature controlled pump.
Detailed Description
The terms of left, right, above, below, horizontal and vertical directions of the invention are based on the directions of the pictures in the text, and are only for convenience of description and do not limit the real objects.
As shown in fig. 1, the long-life temperature control pump system using the spatial 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 includes a bearing gland 4, a front sealing ring 5, a front spatial suspension bearing 6, a rear spatial suspension bearing 7, a rear sealing ring 8, 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 electrical connector 14, an adjusting pad 15, a stator 16, a rotation speed sensor 17 and a rotating shaft 18.
Two ends of a rotating shaft 18 are respectively installed in a shielding sleeve 10 through a front space suspension bearing 6 and a rear space suspension bearing 7, two end ports 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 a central hole of the impeller 3 to install the impeller 3 at the end part of the rotating shaft 18, the root part 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 part of the impeller 3 and the inner wall of the central hole of the bearing gland 4; a rotating speed sensor 17 is arranged at one end part of the rotating shaft 18, which is provided with 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 an adjusting pad 15; the position between the rear space suspension bearing 7 and the middle section of the rotating shaft 18 and the rotating speed sensor 17 is adjusted through an adjusting pad 15; a 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, which is provided with a rear bearing snap ring 11, is inserted into the rear end cover 9; the electrical connector 14 is mounted on the hall housing 12.
As shown in fig. 2, the front space suspension bearing 6 is composed of two parts, namely a front bearing outer ring 6a and a front bearing inner ring 6 b. The front bearing outer ring 6a is structured as shown in fig. 3, the whole structure is approximately a stepped cylinder shape with a large left diameter and a small right diameter, and materials are removed from the circumferential outer wall surface to form an overflow groove; material is removed at the left end face and the recessed location of the left end face removed material cooperates with the bearing gland 4 (as shown in figure 1) to fix the circumferential position against rotation. The right end face is evenly carved with 10 ~ 20 bearing grooves, and the bearing groove designs according to the inside axial force of temperature control pump, and the curve form of bearing groove is Cartesian coordinate curve form, as shown in FIG. 10, the equation is as follows in first coordinate system:
wherein, the origin O of the first coordinate system is positioned at the center of the center hole of the cross section of the front bearing outer ring 6a, and the XY 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 the figure 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 radius direction, and a is an included angle between the tangent direction of the pressure-bearing groove curve and an original point coordinate connecting line; the depth of the pressure bearing groove is 5-50 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, and is wholly similar to a T shape, 20-40 pressure-bearing grooves are engraved on two sides of the outer surface of a cylinder with a smaller diameter on the left side, the curve form of the pressure-bearing grooves is the projection of a straight line shaped like a Chinese character 'ba' on a plane to the cylinder (the straight line shaped like the Chinese character 'ba' is shown as a dotted line in fig. 11), and the equation in a second coordinate system is as follows: the XY 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 and Y are 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 the range is 5-50 mu m. An annular circular groove 19 with the depth of 0.1-0.5mm is formed at the root part close to the large-diameter disc and is used for the inflow lubrication of a lubricating medium; 2-4 through holes are uniformly formed in the annular circular groove 19. The front bearing outer ring 6a and the front bearing inner ring 6b are assembled as shown in fig. 2, the inner circle surface of the front bearing outer ring 6a and the outer circle surface of the front bearing inner ring 6b are in clearance fit, the fit clearance is about 10-30 μm, the right end face of the front bearing outer ring 6a, which is engraved with a pressure bearing groove, is in clearance fit with the left end face of the disk of the front bearing inner ring 6b, the fit clearance is about 10-30 μm, and the specific numerical 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 is cylindrical in overall configuration, and has a flow groove formed by removing material on the outer circumferential wall surface and a recessed position formed by removing material on the left and right end surfaces. As shown in fig. 1, the left end of the rear bearing snap ring 11 is embedded into a recessed position to prevent circumferential rotation and axial movement of the rear bearing outer ring 7 a; as shown in FIG. 7, the rear bearing inner ring 7b is symmetrically provided with pressure grooves (the pressure grooves are in the same form as the front bearing inner ring 6b and are the projection of a straight line in a shape like a Chinese character 'ba' on a plane to the cylinder) on both sides of the outer wall surface of the cylinder, and the depth of the pressure grooves is designed according to the radial force of the temperature control pump, and the range is 5-50 μm. The interior of the aerospace vehicle is designed to be L-shaped, 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, in order to isolate the medium from the stator 16 and prevent the medium from flowing into the stator 16, a plurality of inclined holes 101 are formed in the left side of the shielding sleeve 10 in the circumferential direction, and an included angle formed between each inclined hole 101 and a horizontal line is about 10 degrees, so that the medium can flow in conveniently.
As shown in fig. 1, the engagement between the rotating shaft 18 and the front bearing inner ring 6b and the rear bearing inner ring 7b is interference fit or key fit. And 2-4 through holes are formed in the circumferential direction of the rotating shaft at the matching position of the front bearing inner ring 6b, and 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 is in one-to-one correspondence with the number of the through holes. The shaft 18 is hollow with a central hole through 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 a stator 16 of a motor and a shielding sleeve 10 in a screw fixing mode, and the two front sealing rings 5 can effectively prevent a 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 rear cover plate 17 is fixed to the hall housing 12 by means of screws.
The working principle is as follows:
as shown in fig. 1, the electric connector 14 supplies power to the temperature control pump, the rotating shaft 18 drives the rotating parts such as the impeller 3 to rotate, so as to apply work to the medium, the medium flows in from the medium inlet on the pump body 1, most of the medium flows out from the outlet on the pump body 1, and certain pressure is provided when the medium flows out, so that the medium flows.
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 are used for small circulation of the cooling medium, and the black arrows are used for large circulation of the cooling medium.
In the small circulation of the cooling and lubricating medium, the medium firstly flows to the front space suspension bearing 6 through the gap between the impeller 3 and the bearing gland 4. 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 and B, respectively, in the direction of arrows in fig. 2, enters the pressure-receiving groove, and is blocked by the end of the pressure-receiving groove to form a high-pressure region (as shown in fig. 3 and 4), thereby forming a lubricating film that separates the front bearing outer ring 6a and the front bearing inner ring 6B without frictional wear in physical contact. The redundant medium flows into the small hole in the circumferential direction of the rotating shaft 18 through the small hole in the annular circular groove 19 of the front bearing inner ring 6b, flows to the left side from the central hole of the rotating shaft 18, and returns to the impeller 3 through the hole in the circumferential direction of the shaft end nut 2.
In the cooling and lubricating medium large circulation, the medium passes through the inclined hole of the shielding sleeve 10, continues flowing into the right side 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 a gap between the rear bearing outer ring 7a and the rear bearing inner ring 7b through a path C in the direction of an arrow in fig. 5, enters the pressure bearing groove, is blocked by the tail of the pressure bearing groove to form a high pressure region (as shown in fig. 7), thereby forming a lubricating film, and separates the rear bearing inner ring 7b from the rear bearing outer ring 7a without frictional wear of physical contact; and the other part of the medium flows into the rightmost side of the rotating shaft 18 through the overflowing groove of the rear bearing outer ring 7a, flows into the shaft end nut 2 through a central hole in the rotating shaft 18, and returns through a hole in the circumferential direction of the shaft end nut 2.
In the whole temperature control pump, the rotating parts are a shaft end nut 2, an impeller 3, a rotating shaft 18, a front bearing inner ring 6b, a rear bearing inner ring 7b and an adjusting pad 15, and the rest are static parts. The rotating part and the static part are separated by the lubricating film formed on the surface of the pressure bearing groove, and no mechanical contact and no friction and abrasion are generated, so that the bearing groove is suitable for the environment without space gravity. And the mode of combining the large circulation of the cooling and lubricating medium and the small circulation of the cooling and lubricating medium is adopted in the temperature control pump, so that the 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 service life of the spacecraft in orbit can be prolonged.
The present invention has not been described in detail, partly as is known to the person skilled in the art.
Claims (17)
1. A long-life temperature control pump system adopting a 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 installed in a shielding sleeve (10) through a front space suspension bearing (6) and a rear space suspension bearing (7), end ports at 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 a center hole of the impeller (3) to install the impeller (3) at the end part of the rotating shaft (18), and the root part of the impeller (3) is inserted into the center hole of the bearing gland (4); a rotating speed sensor (17) is arranged at the end part of one end of the rotating shaft (18) provided with the rear space suspension bearing (7); 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), which is provided with the rear bearing clamping ring (11), is inserted into the rear end cover (9); the pump body (1) is connected with a stator (16) of a motor and a shielding sleeve (10); the Hall shell (12) is connected with the rear end cover (9); the rear cover plate (13) is fixed on the Hall shell (12); the electric connector (14) is arranged on the Hall shell (12); the rotating speed sensor (17) is used for feeding back a rotating speed signal.
2. The long life temperature controlled pump system using space suspension bearing as claimed in claim 1, wherein said motor further comprises a front sealing ring (5); two front sealing rings (5) are arranged between the port of the pump body (1) and the outer wall of the shielding sleeve (10).
3. The long life temperature control pump system using space suspension bearing as claimed in claim 1, wherein said motor further comprises a rear seal ring (8); the rear end cover (9) and the shielding sleeve (10) are sealed through two rear sealing rings (8).
4. The long-life temperature control pump system adopting the space suspension bearing is characterized in that the motor further comprises an adjusting pad (15), and the positions of both sides of the front space suspension bearing (6) between the middle section of the rotating shaft (18) and the end part of the impeller (3) are adjusted through the adjusting pad (15); the position between the rear space suspension bearing (7) and the middle section of the rotating shaft (18) and the rotating speed sensor (17) is adjusted through an adjusting pad (15).
5. The long-life temperature control pump system using the spatial suspension bearing as claimed in claim 1, wherein said axial end nut (2) is provided with an inclined through hole around the circumference.
6. The long-life temperature control pump system using the spatial suspension bearing as claimed in claim 1, wherein said front spatial suspension bearing (6) comprises a front bearing outer ring (6a), a front bearing inner ring (6 b);
the front bearing outer ring (6a) is of a stepped cylindrical structure, a large-end cylinder is formed by longitudinally removing materials on the circumferential outer wall surface to form a plurality of tangent planes, and each tangent 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 an overflow groove; the end face of the large end is symmetrically provided with grooves matched with the bearing gland (4) and used for fixing the circumferential position; a plurality of pressure bearing grooves which are spirally distributed are evenly carved on the end surface of the small end; a plurality of radial through holes are uniformly formed in the wall of the small-end cylinder in the circumferential direction and are used for the inflow of a lubricating medium;
the front bearing inner ring (6b) comprises a cylindrical section and a disc; the front bearing inner ring (6b) is provided with a central hole along the central shaft, a plurality of pressure bearing grooves are symmetrically carved 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 grooves on the 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 circumferential direction.
7. The long life temperature controlled pump system using a space suspension bearing as claimed in claim 6, wherein the number of the pressure-bearing grooves on the small end face of the outer race (6a) of the front bearing is 10 to 20, the pressure-bearing grooves are formed in a cartesian coordinate curve, and the depth of the pressure-bearing grooves is 5 to 50 μm, depending on the axial force inside the temperature controlled pump.
8. The long-life temperature control pump system using the spatial suspension bearing as claimed in claim 7, wherein the number of radial through holes on the cylinder wall of the small end of the front bearing outer ring (6a) is 4-10.
9. The long-life temperature control pump system using the space suspension bearing as claimed in claim 6, wherein the curve of the pressure-bearing grooves on both sides of the cylindrical section of the front bearing inner race (6b) is splayed in the projection of the longitudinal section along the central axis of the cylindrical section, and the depth of the pressure-bearing grooves is designed according to the radial force and ranges from 5 μm to 50 μm.
10. The long-life temperature control pump system using the spatial suspension bearing as claimed in claim 6, wherein the depth of the circular groove (19) is 0.1-0.5mm, and the number of radial through holes on the bottom surface of the circular groove is 2-4.
11. The long-life temperature control pump system adopting the spatial suspension bearing as claimed in claim 6, wherein the inner circular surface of the front bearing outer ring (6a) and the outer circular surface of the cylindrical section of the front bearing inner ring (6b) are in clearance fit, the fit clearance is about 10 to 30 μm, the small end face of the front bearing outer ring (6a) engraved with the pressure bearing groove is in clearance fit with the disc end face of the front bearing inner ring (6b), and the fit clearance is 10 to 30 μm.
12. The long-life temperature control pump system using the spatial suspension bearing as claimed in claim 1, wherein the rear spatial suspension bearing (7) comprises a rear bearing outer ring (7a), a rear bearing inner ring (7 b);
the rear bearing outer ring (7a) is cylindrical, materials are longitudinally removed from the outer wall surface to form a plurality of overflow grooves, the overflow grooves are uniformly distributed along the circumferential direction of the outer wall surface, two ends of each overflow groove are respectively provided with a notch, and the notches and the end surface of the rear bearing snap ring (11) form embedded matching to prevent the rear bearing outer ring (7a) from rotating in the circumferential direction and moving in the axial direction;
the inner ring (7b) of the rear bearing comprises an outer layer cylinder and an inner layer cylinder, wherein a plurality of pressure bearing grooves are symmetrically carved 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 shafts on the 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 partition plate along the radial direction.
13. The long life temperature controlled pump system using space suspension bearing as claimed in claim 12, wherein the curve of the pressure grooves on both sides of the inner race (7b) of the rear bearing is splayed in the projection on the longitudinal section along the central axis of the cylindrical section, and the depth of the pressure grooves is designed according to the radial force of the temperature controlled pump and ranges from 5 μm to 50 μm.
14. The long-life temperature control pump system with the spatial suspension bearing is characterized in that the shielding sleeve (10) is made of a high-strength titanium alloy material, 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 inclined holes (101) in different numbers in the circumferential direction.
15. The long-life temperature control pump system adopting the spatial suspension bearing is characterized in that the rotating shaft (18) is matched with the front bearing inner ring (6b) and the rear bearing inner ring (7b) in an interference fit or key fit manner; 2-4 radial through holes are formed in the circumferential direction of the rotating shaft (18) at the position where the rotating shaft is matched with the front bearing inner ring (6b), 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 (6b), and the radial through holes correspond to the positions of the through holes; the rotating shaft (18) is provided with a central hole along the central shaft.
16. The long-life temperature control pump system using the space suspension bearing is characterized in that a gap is left between the outer wall of the root of the impeller (3) and the inner wall of the central hole of the bearing gland (4) according to claim 1.
17. The long-life temperature control pump system adopting the spatial suspension bearing as claimed in any one of claims 1 to 16, wherein the electric 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 (6b), the rear bearing inner ring (7b) and the adjusting pad (15) to rotate, so as to apply work to 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 the medium flows into the motor to be cooled and lubricated, and a small cooling medium circulation and a large cooling medium circulation are formed:
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, media respectively enter the pressure bearing groove along a radial through hole on a small-end cylinder of the front bearing outer ring (6a) and a gap between the front bearing outer ring (6a) and the front bearing inner ring (6b), a high-pressure area is formed by the blockage of the tail part of the pressure bearing groove, a lubricating film is formed, the lubricating film separates the front bearing outer ring (6a) and the front bearing inner ring (6b), and no physical contact friction wear occurs; redundant media flow into a radial through hole at the matching position of the rotating shaft (18) and the front bearing inner ring (6b) through a radial through hole in an annular circular groove (19) of the front bearing inner ring (6b), flow to the shaft end nut (2) from a central hole of the rotating shaft (18), and return to the impeller (3) through an inclined through hole of the shaft end nut (2);
in the large circulation of the cooling and lubricating medium, the medium passes through the inclined hole of the shielding sleeve (10), continues flowing into the rear space suspension bearing (7) along the cavity between the rotating shaft (18) and 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 (7a) and the rear bearing inner ring (7b) and enters the pressure bearing groove, a high-pressure area is formed by the blockage of the tail part of the pressure bearing groove to form a lubricating film, the rear bearing inner ring (7b) and the rear bearing outer ring (7a) are separated, and no physical contact friction and abrasion occur; the other part of the medium flows to one end of the rotating shaft (18) provided with the rear bearing snap ring (11) through the overflow groove of the rear bearing outer ring (7a), 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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| 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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| CN114593085B 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 |
| CN101732769A (en) * | 2010-01-26 | 2010-06-16 | 浙江大学 | Implantable blood pump adopting driven suspension bearing |
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|---|---|
| CN114593085B (en) | 2024-03-15 |
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