A running-in test device for liquid metal bearings for CT

Abstract

The present invention relates to the field of bearing run-in testing technology, and in particular to a run-in testing device for liquid metal bearings used in CT. The device comprises a run-in testing fixture comprising an outer barrel housing, a run-in testing chamber disposed within the outer barrel housing, and an opening disposed on the upper end surface of the outer barrel housing; an outer barrel cover capable of sealing the opening, the outer barrel cover being connected to the upper end surface of the outer barrel housing via multiple connectors; the lower end surface of the outer barrel housing being detachably connected to an outer barrel bottom plate via connectors, the upper end surface of the outer barrel bottom plate being detachably connected to an inner barrel bottom plate via connectors; an inner barrel housing being disposed above the inner barrel bottom plate, the inner barrel housing being located at the center of the run-in testing chamber, and a stator coil being enclosed by the outer ring of the inner barrel housing. The present invention is applicable to the run-in testing of liquid metal bearings in CT tubes, enabling timely and accurate acquisition of the operating performance parameters of the liquid metal bearings, thereby verifying the operating reliability of the liquid metal bearings.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing running-in testing, in particular to a running-in testing device for a liquid metal bearing for CT. Background Art

[0002] The primary function of a bearing is to support the rotation of shaft components. Key quality indicators include its maximum speed and rated load. The relationship between bearing speed and temperature rise is as follows: as speed increases, the bearing heats up, and the temperature rises. The higher the speed, the higher the temperature rise. To determine the performance parameters of a bearing in operation, a running-in test is required.

[0003] Liquid metal bearings are currently widely used in CT tubes due to their excellent heat dissipation performance. However, conventional bearing run-in test devices are primarily designed for ball bearings. However, due to the significant structural differences between liquid metal bearings and ball bearings used in CT tubes, conventional ball bearing run-in test devices are not suitable for running-in testing of liquid metal bearings in CT tubes. Summary of the Invention

[0004] In response to the shortcomings of the above-mentioned existing production technology, the present application provides a running-in test device for liquid metal bearings for CT, which can be used for the running-in test of liquid metal bearings in CT tubes, and can obtain the working performance parameters of the liquid metal bearings in a timely and accurate manner, thereby verifying the working reliability of the liquid metal bearings.

[0005] The technical solutions adopted in the present invention are as follows:

[0006] A running-in test device for a liquid metal bearing for CT, comprising a running-in test tool, the running-in test tool comprising an outer barrel shell, a running-in test cavity being arranged in the outer barrel shell, and an opening being arranged on the upper end surface of the outer barrel shell; an outer barrel cover capable of closing the opening is arranged at the opening, and the outer barrel cover is connected to the upper end surface of the outer barrel shell through a plurality of connectors; the bottom end surface of the outer barrel shell is detachably connected to the outer barrel bottom plate through connectors, and the upper end surface of the outer barrel bottom plate is detachably connected to the inner barrel bottom plate through connectors; an inner barrel shell is arranged above the inner barrel bottom plate, the inner barrel shell is located at the center of the running-in test cavity, the outer ring of the inner barrel shell is sleeved with a stator coil, the shell cavity of the inner barrel shell is used to accommodate the rotor end of the liquid metal bearing, a bearing fixing seat is arranged directly above the inner barrel shell, the bearing fixing seat is used to clamp and fix the non-rotor end of the liquid metal bearing, and the bearing fixing seat is detachably connected to the center position of the lower end surface of the outer barrel cover through connectors.

[0007] Furthermore, it also includes a supporting structure for supporting and connecting the running-in test tooling, the supporting structure includes a fixed bracket, the reducer is fixed on the upper side of the fixed bracket, the input end of the reducer is connected to the center of the adjusting handwheel through a keyway, the output end of the reducer is connected to one end of the sleeve, the sleeve is connected to the bearing seat through a bearing, the bearing seat is detachably connected to the fixed bracket through a connecting piece, and the other end of the sleeve is detachably connected to the side of the outer barrel bottom plate through a connecting piece.

[0008] Furthermore, the stator coil is connected to a stator connecting wire, one end of which extends downward from the bottom end surface of the inner barrel bottom plate. The position where the stator connecting wire extends from the bottom end surface of the inner barrel bottom plate is coated with sealing glue to form a third sealing structure. The third sealing structure wraps the stator connecting wire inside to form a seal.

[0009] Furthermore, a stator support seat is provided on the upper end surface of the inner barrel bottom plate. The stator support seat and the inner barrel bottom plate are integrally formed. The stator support seat is used to position and support the lower part of the stator coil.

[0010] Furthermore, a cooling structure is provided on the outer ring of the inner barrel shell, and the cooling structure includes a cooling shell which is sleeved on the outer ring of the inner barrel shell, the upper inner surface of the cooling shell is welded to the outer surface of the inner barrel shell, and the lower end surface of the cooling shell is detachably connected to the upper end surface of the inner barrel bottom plate through a connecting piece, and a cooling cavity is formed between the cooling shell and the inner barrel shell, and an oil inlet and an oil outlet are respectively provided on the inner barrel bottom plate, and the oil inlet and the oil outlet are respectively connected to the cooling cavity.

[0011] Furthermore, an isolation pad is provided on the upper end surface of the stator coil, and the upper end surface of the isolation pad contacts the upper inner end surface of the cooling shell. The isolation pad can insulate the stator coil and the cooling shell from each other.

[0012] Furthermore, a three-way joint is provided on the outer barrel cover, a first interface of the three-way joint is connected to the running-in test chamber, a second interface of the three-way joint is connected to the vacuum pump, and a third interface of the three-way joint is connected to the vacuum gauge.

[0013] Furthermore, a photoelectric sensor is arranged in the running-in test cavity, one end of the photoelectric sensor extends out of the outer barrel cover, and the other end of the photoelectric sensor extends to the position of the liquid metal bearing. Sealing glue is applied between the outer barrel cover and the extended end of the photoelectric sensor to form a first sealing structure, and the first sealing structure covers the extended end of the photoelectric sensor to form a seal.

[0014] Furthermore, a temperature sensor is arranged in the running-in test chamber, one end of the temperature sensor can contact the liquid metal bearing to be tested, and the other end of the temperature sensor extends out of the outer barrel cover. Sealing glue is applied between the outer barrel cover and the extended end of the temperature sensor to form a second sealing structure, and the second sealing structure covers the extended end of the temperature sensor to form a seal.

[0015] The beneficial effects of the present invention are as follows:

[0016] The present invention can be applied to the running-in test of liquid metal bearings in CT tubes. Through the present invention, the working performance parameters of the liquid metal bearings can be obtained in a timely and accurate manner, thereby verifying the working reliability of the liquid metal bearings; through the present invention, the operating risks of the liquid metal bearings can be exposed in advance, thereby providing a guarantee for the normal operation of the liquid metal bearings after being installed in the CT tube; the support structure of the present invention is connected to the running-in test tooling through a reducer, which can realize the running-in test of the liquid metal bearings in different directions, thereby simulating the actual working conditions of the liquid metal bearings and meeting different testing requirements; the present invention provides a cooling structure on the outer ring of the stator coil, which can timely dissipate the heat generated by the operation of the stator coil, thereby improving the long-term operation reliability of the device; the present invention provides a vacuum pumping component, which can provide a vacuum environment inside the running-in test tooling, thereby solving the problem that the liquid metal bearings are easily oxidized; the present invention monitors various parameters of the liquid metal bearings in real time through temperature sensors and photoelectric sensors, thereby verifying the working reliability of the liquid metal bearings in multiple dimensions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the present invention.

[0018] Figure 2 It is a half-section view of the speed reducer installation structure of the present invention.

[0019] Figure 3 This is a three-dimensional diagram of the running-in test tooling of the present invention.

[0020] Figure 4 It is a half-section view of the running-in test tooling of the present invention.

[0021] Figure 5 This is a schematic structural diagram of the running-in test fixture of the present invention installed with a liquid metal bearing.

[0022] Among them: 1. Bottom plate; 2. Side plate; 3. Reducer; 4. Adjustment handwheel; 5. Bearing seat; 6. Sleeve; 7. Outer barrel bottom plate; 8. Outer barrel shell; 9. Outer barrel cover; 10. T-joint; 11. Photoelectric sensor; 12. First sealing structure; 13. Temperature sensor; 14. Second sealing structure; 15. Stator connecting line; 16. Third sealing structure; 17. Bearing fixing seat; 18. First sealing strip; 19. Cooling shell; 20. Inner barrel shell; 21. Isolation pad; 22. Stator coil; 23. Stator support seat; 24. Second sealing strip; 25. Third sealing strip; 26. Fourth sealing strip; 27. Oil inlet; 28. Oil outlet; 29. ​​Inner barrel bottom plate. DETAILED DESCRIPTION

[0023] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0024] like Figure 1As shown, a running-in test device for a liquid metal bearing for CT includes a running-in test fixture for fixing the liquid metal bearing and a support structure for supporting and connecting the running-in test fixture.

[0025] like Figure 1 and Figure 2 As shown, the support structure includes a fixed bracket, and the reducer 3 is fixed on the upper side of the fixed bracket. The input end of the reducer 3 is connected to the center of the adjusting handwheel 4 through a keyway, and the operator can manually drive the adjusting handwheel 4 to rotate, thereby driving the reducer 3 to rotate. The output end of the reducer 3 is connected to one end of the sleeve 6, and the sleeve 6 is connected to the bearing seat 5 through a bearing, and the bearing seat 5 is detachably connected to the fixed bracket by bolts. The other end of the sleeve 6 is detachably connected to the running-in test fixture by bolts. The output end of the reducer 3 can drive the sleeve 6 to rotate, and the sleeve 6 can drive the running-in test fixture to rotate and adjust the angle. The support structure of the present invention is connected to the running-in test fixture through the reducer 3, which can realize the running-in test of the liquid metal bearing in different directions, thereby simulating the actual working conditions of the liquid metal bearing and meeting different testing requirements.

[0026] like Figure 1 As shown, the fixed bracket includes a horizontally arranged bottom plate 1, one end of the bottom plate 1 is fixedly connected to a vertically arranged side plate 2, and the side plate 2 is used to fix the reducer 3.

[0027] like Figure 3 and Figure 4 As shown, the run-in test fixture includes a cylindrical outer barrel shell 8, the bottom end of which is removably connected to the outer barrel bottom plate 7 via bolts. The side of the outer barrel bottom plate 7 is connected via a removable sleeve 6 with bolts. A run-in test chamber is defined within the outer barrel shell 8, and an opening is provided on the upper end of the outer barrel shell 8. The liquid metal bearing A is inserted into the run-in test chamber through the opening. A cover 9 is provided at the opening to seal the opening. The cover 9 is connected to the upper end of the outer barrel shell 8 via multiple bolts.

[0028] like Figure 4 As shown, a circle of first sealing grooves is provided on the top end surface of the outer barrel shell 8 along the circumferential direction, and a first sealing strip 18 is provided in the first sealing groove. The first sealing strip 18 is in sealing contact with the lower end surface of the outer barrel cover 9.

[0029] like Figure 4 As shown, a circle of second sealing grooves is provided on the bottom end surface of the outer barrel shell 8 along the circumferential direction, and a second sealing strip 24 is provided in the second sealing groove. The second sealing strip 24 is in sealing contact with the upper end surface of the outer barrel bottom plate 7.

[0030] like Figure 4As shown, the upper end surface of the outer barrel bottom plate 7 is removably connected to the inner barrel bottom plate 29 via bolts. The inner barrel housing 20 is located above the inner barrel bottom plate 29 and is located at the center of the run-in test chamber. The outer ring of the inner barrel housing 20 houses the stator coil 22. The inner cavity of the inner barrel housing 20 is used to accommodate the lower portion of the liquid metal bearing A. A bearing retainer 17 is located directly above the inner barrel housing 20. This retainer 17 is used to clamp and secure the non-rotor end of the liquid metal bearing. The bearing retainer 17 is removably connected to the center of the lower end surface of the outer barrel cover 9 via bolts.

[0031] like Figure 4 As shown, a circle of third sealing grooves is provided on the lower end surface of the inner tub bottom plate 29 along the circumferential direction, and a third sealing strip 25 is provided in the third sealing groove. The third sealing strip 25 is in sealing contact with the upper end surface of the outer tub bottom plate 7.

[0032] like Figure 5 As shown, during the running-in test, the rotor end of the liquid metal bearing A extends into the inner cavity of the inner barrel shell 20, and the non-rotor end of the liquid metal bearing A is clamped and fixed in the bearing fixing seat 17. When the stator coil 22 is energized, the rotor part of the liquid metal bearing A can rotate.

[0033] like Figure 4 As shown, the stator coil 22 is connected to a stator connecting wire 15, one end of which extends downward from the bottom end surface of the inner tub bottom plate 29. Sealant is applied to the portion where the stator connecting wire 15 extends from the bottom end surface of the inner tub bottom plate 29 to form a third sealing structure 16, which encloses the stator connecting wire 15 to form a seal.

[0034] like Figure 4 As shown, a stator support seat 23 is provided on the upper end surface of the inner barrel bottom plate 29 . The stator support seat 23 and the inner barrel bottom plate 29 are integrally formed. The stator support seat 23 is used to position and support the lower part of the stator coil 22 .

[0035] like Figure 4 As shown, the outer ring of the inner barrel shell 20 is equipped with a cooling structure. The cooling structure includes a cooling shell 19 that is sleeved over the outer ring of the inner barrel shell 20. The upper inner surface of the cooling shell 19 is welded to the outer surface of the inner barrel shell 20, and the lower end surface of the cooling shell 19 is removably connected to the upper end surface of the inner barrel bottom plate 29 by bolts. A cooling chamber is formed between the cooling shell 19 and the inner barrel shell 20. The inner barrel bottom plate 29 is provided with an oil inlet 27 and an oil outlet 28, respectively, which communicate with the cooling chamber. The oil inlet 27 is located on the inner ring of the stator coil 22, and the oil outlet 28 is located on the outer ring of the stator coil 22. During the run-in test, an external oil pump is connected to the oil inlet 27 to pump cooling insulating oil into the cooling chamber. The cooling insulating oil and the stator coil 22 exchange heat, and the heat-exchanged insulating oil is promptly discharged through the oil outlet 28, removing heat from the stator coil 22.

[0036] like Figure 4 As shown, an isolation pad 21 is provided on the upper end surface of the stator coil 22 , and the upper end surface of the isolation pad 21 contacts the upper inner end surface of the cooling shell 19 . The isolation pad 21 can insulate the stator coil 22 and the cooling shell 19 from each other.

[0037] like Figure 4 As shown, a circle of fourth sealing grooves is provided on the lower end surface of the cooling shell 19 along the circumferential direction, and a fourth sealing strip 26 is provided in the fourth sealing groove. The fourth sealing strip 26 is in sealing contact with the upper end surface of the inner barrel bottom plate 29.

[0038] like Figure 4 As shown, a three-way joint 10 is provided on the outer barrel cover 9, a first interface of the three-way joint 10 is connected to the running-in test chamber, a second interface of the three-way joint 10 is connected to the vacuum pump, and a third interface of the three-way joint 10 is connected to the vacuum gauge. When performing the running-in test, the vacuum pump can evacuate the running-in test chamber to a high vacuum state, and the vacuum gauge can monitor the vacuum degree inside the running-in test chamber in real time.

[0039] like Figure 4 As shown, a photoelectric sensor 11 is installed in the run-in test chamber. One end of the photoelectric sensor 11 extends beyond the outer barrel cover 9, and the other end of the photoelectric sensor 11 extends to the position of the liquid metal bearing A. Sealant is applied between the outer barrel cover 9 and the extended end of the photoelectric sensor 11 to form a first sealing structure 12, which covers the extended end of the photoelectric sensor 11 to form a seal. During the run-in test, the photoelectric sensor 11, in conjunction with the host computer, monitors the speed and current of the liquid metal bearing A in real time. Based on the test results, the performance of the liquid metal bearing A is evaluated from multiple dimensions.

[0040] like Figure 4 As shown, a temperature sensor 13 is installed in the running-in test chamber. One end of the temperature sensor 13 can contact the liquid metal bearing A under test, and the other end of the temperature sensor 13 extends out of the outer barrel cover 9. Sealant glue is applied between the outer barrel cover 9 and the extended end of the temperature sensor 13 to form a second sealing structure 14. The second sealing structure 14 covers the extended end of the temperature sensor 13 to form a seal. The temperature sensor 13 can monitor the temperature changes of the liquid metal bearing under test in real time.

[0041] The operating process for the bearing run-in test of the present invention is as follows: the non-rotor end of the liquid metal bearing A to be tested is securely fixed via the bearing holder 17, and the rotor end of the liquid metal bearing A extends into the inner barrel housing 20. The operator then rotates the reducer 3 by adjusting the handwheel 4, using the reducer 3 to rotate the run-in test fixture to the desired angle (-180° to 180°). The required speed and test duration are set using the host computer software. The T-connector 10 is connected to an external vacuum pump assembly and evacuates the system to a high vacuum state. The oil inlet 27 is connected to an external oil pump to fill the oil cooling system chamber with insulating oil. Simultaneously, the heat-exchanged insulating oil flows out through the oil outlet 28, forming an insulating oil circulation path to promptly remove heat generated by the stator. The stator coil 22 is energized, driving the rotor subassembly of the liquid metal bearing A to be tested, achieving the run-in rotation of the liquid metal bearing A to be tested. During the test, the temperature sensor 13 monitors the temperature changes of the tested bearing in real time. The photoelectric sensor 11, in conjunction with the host computer, can monitor the speed and current of the bearing under test in real time. Based on the test results, the performance of the bearing under test can be evaluated in multiple dimensions.

[0042] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. A running-in test device for a liquid metal bearing for CT, including a running-in test tool, characterized by: The running-in test fixture comprises an outer barrel shell (8), a running-in test cavity is arranged in the outer barrel shell (8), and an opening is arranged on the upper end surface of the outer barrel shell (8); an outer barrel cover (9) capable of closing the opening is arranged at the opening, and the outer barrel cover (9) is connected to the upper end surface of the outer barrel shell (8) through a plurality of connecting pieces; the bottom end surface of the outer barrel shell (8) is detachably connected to the outer barrel bottom plate (7) through the connecting piece, and the upper end surface of the outer barrel bottom plate (7) is detachably connected to the inner barrel bottom plate (29) through the connecting piece, and an inner barrel shell (20) is arranged above the inner barrel bottom plate (29), and the inner barrel shell (20) is located at the center of the running-in test cavity, the outer ring of the inner barrel shell (20) is sleeved with the stator coil (22), and the shell cavity of the inner barrel shell (20) is used to accommodate the rotor end of the liquid metal bearing A bearing fixing seat (17) is provided just above the inner barrel shell (20), and the bearing fixing seat (17) is used to clamp and fix the non-rotor end of the liquid metal bearing, and the bearing fixing seat (17) is detachably connected to the center position of the lower end surface of the outer barrel cover (9) through a connecting piece; and further comprises a support structure for supporting and connecting the running-in test fixture, the support structure comprising a fixed bracket, the upper side of the fixed bracket fixing the reducer (3), the input end of the reducer (3) is connected to the center of the adjusting hand wheel (4) through a keyway, the output end of the reducer (3) is connected to one end of the sleeve (6), the sleeve (6) is connected to the bearing seat (5) through a bearing, the bearing seat (5) is detachably connected to the fixed bracket through a connecting piece, and the other end of the sleeve (6) is detachably connected to the side of the outer barrel bottom plate (7) through a connecting piece; The outer ring of the inner barrel shell (20) is provided with a cooling structure, and the cooling structure includes a cooling shell (19) sleeved on the outer ring of the inner barrel shell (20), the upper inner surface of the cooling shell (19) and the outer surface of the inner barrel shell (20) are welded, and the lower end surface of the cooling shell (19) is detachably connected to the upper end surface of the inner barrel bottom plate (29) through a connecting piece, and a cooling cavity is formed between the cooling shell (19) and the inner barrel shell (20), and an oil inlet (27) and an oil outlet (28) are respectively provided on the inner barrel bottom plate (29), and the oil inlet (27) and the oil outlet (28) are respectively communicated with the cooling cavity; A three-way joint (10) is provided on the outer barrel cover (9), a first interface of the three-way joint (10) is connected to the running-in test chamber, a second interface of the three-way joint (10) is connected to the vacuum pump, and a third interface of the three-way joint (10) is connected to the vacuum gauge.

2. The running-in test device for a liquid metal bearing for CT according to claim 1, characterized in that: The stator coil (22) is connected to a stator connecting wire (15), one end of which extends downward from the bottom end surface of the inner barrel bottom plate (29). A sealing glue is applied to the position where the stator connecting wire (15) extends from the bottom end surface of the inner barrel bottom plate (29) to form a third sealing structure (16). The third sealing structure (16) covers the stator connecting wire (15) to form a seal.

3. The running-in test device for a liquid metal bearing for CT according to claim 2, characterized in that: A stator support seat (23) is provided on the upper end surface of the inner barrel bottom plate (29); the stator support seat (23) and the inner barrel bottom plate (29) are integrally formed; the stator support seat (23) is used to position and support the lower portion of the stator coil (22).

4. The running-in test device for a liquid metal bearing for CT according to claim 1, characterized in that: An isolation pad (21) is provided on the upper end surface of the stator coil (22), and the upper end surface of the isolation pad (21) contacts the upper inner end surface of the cooling shell (19). The isolation pad (21) can insulate the stator coil (22) and the cooling shell (19) from each other.

5. The running-in test device for liquid metal bearings for CT according to claim 1, characterized in that: A photoelectric sensor (11) is provided in the running-in test chamber, one end of the photoelectric sensor (11) extends out of the outer barrel cover (9), and the other end of the photoelectric sensor (11) extends to the position of the liquid metal bearing. Sealing glue is applied between the outer barrel cover (9) and the extended end of the photoelectric sensor (11) to form a first sealing structure (12), and the first sealing structure (12) covers the extended end of the photoelectric sensor (11) to form a seal.

6. The running-in test device for liquid metal bearings for CT according to claim 5, characterized in that: A temperature sensor (13) is provided in the running-in test chamber, one end of the temperature sensor (13) is capable of contacting the liquid metal bearing to be tested, and the other end of the temperature sensor (13) extends out of the outer barrel cover (9), and sealing glue is applied between the outer barrel cover (9) and the extended end of the temperature sensor (13) to form a second sealing structure (14), and the second sealing structure (14) covers the extended end of the temperature sensor (13) to form a seal.

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