Rotary piston type bidirectional loading device

Abstract

The invention discloses a rotary piston type bidirectional loading device, which comprises a test bed, a shaft body and a mounting shell, and is characterized in that the test bed is detachably connected with a bearing to be tested; one end of the shaft body is detachably connected with a to-be-tested bearing, and one end, far away from the to-be-tested bearing, of the shaft body is detachably connected with a piston; the mounting shell and the test bed are detachably connected, a sliding cavity is formed in the mounting shell, the piston is arranged in the sliding cavity in a sliding mode, and the piston can rotate around the central axis of the sliding cavity; a first hydraulic cavity and a second hydraulic cavity are formed in the two sides, in the sliding direction of the piston, of the sliding cavity correspondingly, and the first hydraulic cavity and the second hydraulic cavity communicate with a control oil way. By controlling the pressure difference in the first hydraulic cavity and the second hydraulic cavity, the acting force of the hydraulic pressure acting on the piston has a clear direction and size due to the pressure difference, so that the conditions of the bearing in two directions and different loads are simulated, and the two-way loading test of the bearing is completed.

Description

Technical Field

[0001] The invention belongs to the technical field of bearing detection, and in particular relates to a rotary piston type bidirectional loading device. Background Art

[0002] Currently, bidirectional oil-lubricated thrust bearings used in nuclear power plants withstand an axial force of approximately 600 kN during normal operation, and 900 kN under start-up and shutdown conditions. These are high-pressure oil-lubricated sliding bearings used in the nuclear main pumps of mega-kilowatt-class nuclear power plants. During the development of bidirectional thrust bearings, it is necessary to simulate the actual loads that bidirectional thrust bearings experience in the nuclear main pumps. This involves simulating the combined forces of the shaft system's deadweight, water thrust, and system pressure on the thrust bearings during actual operation. Therefore, it is essential to develop a rotary piston bidirectional loading device for bidirectional thrust bearings in nuclear main pumps. Summary of the Invention

[0003] The purpose of the present invention is to provide a rotary piston bidirectional loading device to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above-mentioned objectives, the present invention provides a rotary piston type bidirectional loading device, comprising a test bench, a shaft body and a mounting shell, wherein the test bench is detachably connected to a bearing to be tested; one end of the shaft body is detachably connected to the bearing to be tested, and the end of the shaft body away from the bearing to be tested is detachably connected to a piston; the mounting shell and the test bench are detachably connected, a sliding chamber is provided inside the mounting shell, the piston is slidably arranged in the sliding chamber, and the piston can rotate around the central axis of the sliding chamber; the sliding chamber is respectively provided with a first hydraulic chamber and a second hydraulic chamber on both sides of the sliding direction of the piston, and the first hydraulic chamber and the second hydraulic chamber are connected to a control oil circuit.

[0005] Optionally, the shaft body includes a first shaft body and a second shaft body that are detachably connected, the first shaft body and the bearing to be tested are detachably connected, and the piston is detachably connected to the second shaft body.

[0006] Optionally, the mounting shell is a split structure, which includes a cover plate, a box body and a fixed plate arranged in sequence, the cover plate, the box body and the fixed plate are detachably connected, the fixed plate and the test bench are detachably connected, the second shaft passes through the cover plate and is rotatably connected to the cover plate; the first hydraulic chamber is arranged between the cover plate and the box body, and the second hydraulic chamber is arranged between the box body and the fixed plate.

[0007] Optionally, lubrication gaps are provided between the piston and the box body, and between the second shaft body and the cover plate.

[0008] Optionally, one end of the cover plate away from the box body is rotatably connected to an oil collecting tank, and the lubrication gap between the second shaft and the cover plate is connected to the oil collecting tank.

[0009] Optionally, the first shaft body and the second shaft body are detachably connected via a connecting flange, the connecting flange is disposed in the oil collecting tank, and the connecting flange and the oil collecting tank are rotatably connected.

[0010] Optionally, a plurality of annular protrusions are fixedly provided on the radial outer side of the connecting flange, and the diameters of the annular protrusions are all larger than the outer diameter of the connecting flange, and the diameters of the annular protrusions are all smaller than the inner diameter of the oil collecting tank.

[0011] Optionally, a first sealing ring is provided between the cover plate and the box body, and between the box body and the fixing plate.

[0012] Optionally, a mounting hole is provided on the piston, and the shaft body is threadedly connected to a limiting nut after passing through the mounting hole. The limiting nut is provided at one end of the shaft body away from the bearing to be tested, and the outer diameter of the limiting nut is larger than the diameter of the piston mounting hole.

[0013] Optionally, a cotter pin is inserted into the shaft on a side of the limiting nut facing away from the piston.

[0014] Compared with the prior art, the present invention has the following advantages and technical effects:

[0015] When this embodiment is working, the bearing to be tested is installed between the test bench and the shaft body. Due to the presence of the bearing to be tested, the shaft body can rotate relative to the test bench, and the shaft body and the piston are detachably connected, and the piston is slidingly arranged in the sliding cavity inside the mounting shell, so the shaft body and the piston can rotate synchronously around the central axis of the sliding cavity. It is also stipulated that the first hydraulic cavity is arranged on the side close to the bearing to be tested, and the second hydraulic cavity is arranged on the side away from the bearing to be tested, and it is stipulated that the direction from the first hydraulic cavity to the second hydraulic cavity is the first direction, and the direction from the second hydraulic cavity to the first hydraulic cavity is the second direction; when it is necessary to apply an axial force in the first direction to the bearing to be tested, hydraulic oil is supplied to the first hydraulic cavity by controlling the oil circuit, and the hydraulic oil in the second hydraulic cavity is recovered, so that the pressure of the hydraulic oil in the first hydraulic cavity is greater than the pressure of the hydraulic oil in the second hydraulic cavity, so that the direction of the force acting on the piston is the first direction, and at the same time, because the piston passes through the shaft body It is connected to the bearing to be tested, so the force is transmitted to the bearing to be tested, thereby achieving the effect of applying an axial force in the first direction to the bearing to be tested; when it is necessary to apply an axial force in the second direction to the bearing to be tested, the hydraulic oil is supplied to the second hydraulic chamber by controlling the oil circuit, and the hydraulic oil in the first hydraulic chamber is recovered, so that the pressure of the hydraulic oil in the second hydraulic chamber is greater than the pressure of the hydraulic oil in the first hydraulic chamber, so that the direction of the force acting on the piston is the second direction. At the same time, since the piston is connected to the bearing to be tested through the shaft, the force is transmitted to the bearing to be tested, thereby achieving the effect of applying an axial force in the second direction to the bearing to be tested. The present invention controls the pressure difference in the first hydraulic chamber and the second hydraulic chamber, so that the pressure difference makes the force of the hydraulic pressure acting on the piston have a clear direction and size, thereby simulating the bearing in bidirectional and different load conditions, and completing the bearing bidirectional loading test. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic structural diagram of the bidirectional loading device of the present invention;

[0018] Figure 2 This is a schematic diagram of the box structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the piston structure of the present invention;

[0020] Figure 4 This is a schematic diagram of the cover structure of the present invention;

[0021] Figure 5 for Figure 4Middle AA section view;

[0022] Figure 6 This is a schematic diagram of the connecting flange structure of the present invention;

[0023] Among them, 1. test bench, 2. fixing plate, 3. box body, 4. piston, 5. cover plate, 6. second shaft, 7. connecting flange, 8. oil collecting tank, 9. first shaft, 10. first screw, 11. first gasket, 12. first sealing ring, 13. second sealing ring, 14. fixing nut, 15. second gasket, 16. bolt, 17. limit nut, 18. cotter pin, 19. second screw, 20. third screw. DETAILED DESCRIPTION

[0024] It should be noted that, unless there is a conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other. The embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0025] Referring to the accompanying drawings, the present invention provides a rotary piston-type bidirectional loading device, comprising a test bench 1, a shaft, and a mounting housing. The test bench 1 is detachably connected to a bearing to be tested; one end of the shaft is detachably connected to the bearing to be tested, and the end of the shaft away from the bearing to be tested is detachably connected to a piston 4; the mounting housing is detachably connected to the test bench 1, and a sliding chamber is defined within the mounting housing. The piston 4 is slidably disposed within the sliding chamber and can rotate about the central axis of the sliding chamber. The sliding chamber is provided with a first hydraulic chamber and a second hydraulic chamber on either side of the sliding direction of the piston 4, respectively. The first hydraulic chamber and the second hydraulic chamber are connected by a control oil circuit. In this embodiment, the bearing to be tested is primarily a bidirectional thrust bearing, but other types of bearings are also possible.

[0026] When this embodiment is working, the bearing to be tested is installed between the test bench 1 and the shaft body. Due to the presence of the bearing to be tested, the shaft body can rotate relative to the test bench 1, and the shaft body and the piston 4 are detachably connected, and the piston 4 is slidingly arranged in the sliding cavity inside the mounting shell, so the shaft body and the piston 4 can rotate synchronously around the central axis of the sliding cavity. In this embodiment, it is stipulated that the first hydraulic chamber is arranged on the side close to the bearing to be tested, and the second hydraulic chamber is arranged on the side away from the bearing to be tested, and it is stipulated that the direction from the first hydraulic chamber to the second hydraulic chamber is the first direction, and the direction from the second hydraulic chamber to the first hydraulic chamber is the second direction; when it is necessary to apply an axial force in the first direction to the bearing to be tested, hydraulic oil is supplied to the first hydraulic chamber by controlling the oil circuit, and the hydraulic oil in the second hydraulic chamber is recovered, so that the pressure of the hydraulic oil in the first hydraulic chamber is greater than the pressure of the hydraulic oil in the second hydraulic chamber, so that the direction of the force acting on the piston 4 is the first direction, and at the same time, since the piston 4 is through The shaft body is connected to the bearing to be tested, so the force is transmitted to the bearing to be tested, thereby achieving the effect of applying an axial force in the first direction to the bearing to be tested; when it is necessary to apply an axial force in the second direction to the bearing to be tested, the hydraulic oil is supplied to the second hydraulic chamber by controlling the oil circuit, and the hydraulic oil in the first hydraulic chamber is recovered, so that the pressure of the hydraulic oil in the second hydraulic chamber is greater than the pressure of the hydraulic oil in the first hydraulic chamber, so that the direction of the force acting on the piston 4 is the second direction. At the same time, since the piston 4 is connected to the bearing to be tested through the shaft body, the force is transmitted to the bearing to be tested, thereby achieving the effect of applying an axial force in the second direction to the bearing to be tested. The present invention controls the pressure difference in the first hydraulic chamber and the second hydraulic chamber, so that the pressure difference makes the force acting on the piston 4 have a clear direction and magnitude, thereby simulating the bearing in bidirectional and different load conditions, and completing the bearing bidirectional loading test.

[0027] During operation, the motor drives the shaft to rotate, simulating dynamic loading of the bearing. During simulation experiments, the shaft does not rotate, indicating static loading. During normal operation, the bidirectional loading device can achieve dynamic loading within the range of 0-900 kN and static loading within the range of 0-1500 kN, meeting the combined forces of the shaft system's deadweight, water thrust, and system pressure on the thrust bearing during simulated main pump operation. The first and second hydraulic chambers are each provided with multiple liquid inlets, which are evenly distributed, i.e., the distance between any two adjacent inlets is the same. The self-balancing of multiple oil inlets facilitates the balancing of the upper and lower oil pressure loading on the piston 4, thereby ensuring a balanced loading force on the bidirectional thrust bearing and preventing jamming.

[0028] A further optimized solution is that the shaft includes a detachably connected first shaft 9 and a second shaft 6, the first shaft 9 and the bearing to be tested are detachably connected, and the piston 4 is detachably connected to the second shaft 6. In this embodiment, the shaft is configured as a split structure, comprising the first shaft 9 and the second shaft 6, and the two are detachably connected, ensuring that the force can be transmitted normally while ensuring that the first shaft 9 and the second shaft 6 can rotate synchronously. At the same time, the shaft is configured as a split structure to ensure that when replacing the bearing to be tested, only the first shaft 9 and the second shaft 6 need to be separated, the second shaft 6 remains in its position, the original bearing to be tested is separated from the first shaft 9, and the new bearing to be tested is reinstalled.

[0029] Preferably, the mounting shell is a split structure, which includes a cover plate 5, a box body 3 and a fixed plate 2 arranged in sequence, the cover plate 5, the box body 3 and the fixed plate 2 are detachably connected, the fixed plate 2 and the test bench 1 are detachably connected, the second shaft 6 passes through the cover plate 5 and is rotatably connected to the cover plate 5; the first hydraulic chamber is arranged between the cover plate 5 and the box body 3, and the second hydraulic chamber is arranged between the box body 3 and the fixed plate 2; setting the mounting shell as a split structure facilitates the installation of the piston 4, that is, when installing the piston 4, the cover plate 5, the box body 3 and the fixed plate 2 are disassembled, the second shaft 6 passes through the cover plate 5 and the piston 4 in sequence, and the second shaft 6 and the piston 4 are connected, the connected piston 4 is placed into the sliding cavity in the box body 3, so that the piston 4 is slidably arranged in the sliding cavity, and the piston 4 can rotate around the central axis of the sliding cavity, and then the cover plate 5, the box body 3 and the fixed plate 2 are connected, and the fixed plate 2 and the test bench 1 are connected to complete the installation of the piston 4. In some embodiments, the cover plate 5, the box body 3, and the fixed plate 2 are connected by a first screw 10. The end of the first screw 10 is set on one side of the fixed plate 2, and a first gasket 11 is set between the end of the first screw 10 and the fixed plate 2 to ensure the stability of the first screw 10. In some embodiments, a first sealing ring 12 is set between the cover plate 5 and the box body 3, and between the box body 3 and the fixed plate 2. The first sealing ring 12 ensures the sealing of the connection between the cover plate 5 and the box body 3, and the connection between the box body 3 and the fixed plate 2, and ensures the sealing of the first hydraulic chamber and the second hydraulic chamber. In some embodiments, the fixed plate 2 and the test bench 1 are detachably connected by a second screw 19; the test bench 1 is also provided with a connecting assembly, which includes a fixing nut 14, a second gasket 15, and a bolt 16. The test bench 1 is connected to the external structure through the connecting assembly.

[0030] In a further optimized solution, the second shaft 6 and the piston 4 are detachably connected via a key. To ensure the stability of the connection between the second shaft 6 and the piston 4, a mounting hole is provided on the piston 4 in addition to the key connection. The shaft passes through the mounting hole and is threadedly connected to a limit nut 17. The limit nut 17 is provided at the end of the shaft away from the bearing to be tested. The outer diameter of the limit nut 17 is larger than the diameter of the mounting hole of the piston 4. The limit nut 17 is threadedly connected to the second shaft 6, and an extrusion force is applied to the piston 4 by the limit nut 17, so that the piston 4 is tightly abutted against the stepped shaft of the second shaft 6, further ensuring the stability of the connection between the second shaft 6 and the piston 4. In certain embodiments, a cotter pin 18 is inserted into the shaft on the side of the limit nut 17 facing away from the piston 4. The cotter pin 18 prevents the limit nut 17 and the second shaft 6 from rotating relative to each other, preventing the limit nut 17 from loosening, further ensuring the stability of the connection between the second shaft 6 and the piston 4.

[0031] In this embodiment, since both the piston 4 and the second shaft 6 can rotate, significant friction exists between the piston 4 and the housing 3, and between the second shaft 6 and the cover plate 5. This generates significant heat between the piston 4 and the housing 3, and between the second shaft 6 and the cover plate 5. This heats the hydraulic oil in the vicinity and causes wear between the piston 4 and the housing 3, and between the second shaft 6 and the cover plate 5. This can lead to poor sealing between the first and second hydraulic chambers, or prevent the hydraulic pressure differential from generating a force on the piston 4. In this embodiment, lubrication gaps are provided between the piston 4 and the housing 3, and between the second shaft 6 and the cover plate 5. High-pressure hydraulic oil in the first and second hydraulic chambers flows through the lubrication gaps between the piston 4 and the housing 3, and between the second shaft 6 and the cover plate 5, lubricating the rotating contact points of the components, reducing frictional losses and frictional heat generation. In some embodiments, the second shaft 6 is provided with an oil reservoir, and the piston 4 is provided with an oil reservoir at its center to store some hydraulic oil for lubrication of the contact points of the components.

[0032] In a further optimization scheme, the end of the cover plate 5 away from the housing 3 is rotatably connected to an oil collecting tank 8. The lubrication gap between the second shaft 6 and the cover plate 5 is connected to the oil collecting tank 8. The high-pressure hydraulic oil in the first and second hydraulic chambers moves between the piston 4 and the housing 3, and between the second shaft 6 and the cover plate 5 through the lubrication gap. Because the lubrication gap between the second shaft 6 and the cover plate 5 is connected to the oil collecting tank 8, the hydraulic oil enters the oil collecting tank 8 through the lubrication gap, thereby collecting the hydraulic oil. In certain embodiments, the bottom of the oil collecting tank 8 is provided with an oil drain hole, and the outer side of the oil drain hole is connected to an oil return line. The hydraulic oil is discharged back to the outer tank through the oil drain hole and the oil return line on the oil collecting tank 8.

[0033] In a further optimized solution, the first shaft 9 and the second shaft 6 are detachably connected via a connecting flange 7, which is disposed within the oil collecting tank 8 and rotatably connected to the connecting flange 7. In this embodiment, the first shaft 9 and the second shaft 6 are connected via the connecting flange 7, which is disposed within the oil collecting tank 8 and rotatably connected to the connecting flange 7, thereby reducing space waste. In certain embodiments, the connecting flange 7 and the second shaft 6 have an interference fit, and the first shaft 9 and the connecting flange 7 are connected via a third screw 20, allowing for quick connection and removal of the first shaft 9 and the connecting flange 7. Preferably, a plurality of annular protrusions are fixedly provided on the radially outer side of the connecting flange 7. The diameter of each annular protrusion is larger than the outer diameter of the connecting flange 7 and smaller than the inner diameter of the oil collecting tank 8. The annular protrusions block the hydraulic oil that sprays or flows out of the lubrication gap between the second shaft 6 and the cover plate 5, preventing the hydraulic oil from flowing out of the connection between the connecting flange 7 and the oil collecting tank 8. At the same time, since the connecting flange 7 is connected to the second shaft 6, the rotation of the second shaft 6 drives the connecting flange 7 to rotate, and the annular protrusions block the splashing hydraulic oil. In some embodiments, a second sealing ring 13 is provided between the cover plate 5 and the oil collecting tank 8. The second sealing ring 13 ensures that the oil collecting tank 8 is isolated from the outside world and prevents the hydraulic oil from flowing out of the gap between the cover plate 5 and the oil collecting tank 8.

[0034] The description of the above embodiments is only used to help understand the method of this application and its core idea; at the same time, for those skilled in the art, according to the idea of ​​this application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present application.

[0035] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0036] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A rotary piston bidirectional loading device, characterized in that: include: A test bench (1), wherein the test bench (1) is detachably connected to a bearing to be tested; A shaft body, one end of the shaft body being detachably connected to the bearing to be tested, and an end of the shaft body away from the bearing to be tested being detachably connected to a piston (4); A mounting shell is provided, wherein the mounting shell and the test bench (1) are detachably connected, a sliding chamber is provided inside the mounting shell, the piston (4) is slidingly arranged in the sliding chamber, and the piston (4) can rotate around the central axis of the sliding chamber; the sliding chamber is provided with a first hydraulic chamber and a second hydraulic chamber on both sides of the sliding direction of the piston (4), respectively, and the first hydraulic chamber and the second hydraulic chamber are connected to a control oil circuit.

2. A rotary piston bidirectional loading device according to claim 1, characterized in that: The shaft body comprises a first shaft body (9) and a second shaft body (6) which are detachably connected, the first shaft body (9) and the bearing to be tested are detachably connected, and the piston (4) is detachably connected to the second shaft body (6).

3. A rotary piston bidirectional loading device according to claim 2, characterized in that: The mounting housing is a split structure, comprising a cover plate (5), a box body (3) and a fixed plate (2) arranged in sequence, wherein the cover plate (5), the box body (3) and the fixed plate (2) are detachably connected, the fixed plate (2) and the test bench (1) are detachably connected, the second shaft (6) passes through the cover plate (5) and is rotatably connected to the cover plate (5); the first hydraulic chamber is arranged between the cover plate (5) and the box body (3), and the second hydraulic chamber is arranged between the box body (3) and the fixed plate (2).

4. A rotary piston bidirectional loading device according to claim 3, characterized in that: Lubrication gaps are provided between the piston (4) and the box body (3), and between the second shaft body (6) and the cover plate (5).

5. A rotary piston bidirectional loading device according to claim 4, characterized in that: One end of the cover plate (5) away from the box body (3) is rotatably connected to an oil collecting tank (8), and a lubrication gap between the second shaft (6) and the cover plate (5) is in communication with the oil collecting tank (8).

6. A rotary piston bidirectional loading device according to claim 5, characterized in that: The first shaft (9) and the second shaft (6) are detachably connected via a connecting flange (7); the connecting flange (7) is disposed in the oil collecting tank (8), and the connecting flange (7) and the oil collecting tank (8) are rotatably connected.

7. A rotary piston bidirectional loading device according to claim 6, characterized in that: A plurality of annular protrusions are fixedly provided on the radial outer side of the connecting flange (7), wherein the diameters of the annular protrusions are all larger than the outer diameter of the connecting flange (7), and the diameters of the annular protrusions are all smaller than the inner diameter of the oil collecting tank (8).

8. The rotary piston bidirectional loading device according to claim 3, characterized in that: A first sealing ring (12) is provided between the cover plate (5) and the box body (3), and between the box body (3) and the fixed plate (2).

9. The rotary piston bidirectional loading device according to claim 1, characterized in that: The piston (4) is provided with a mounting hole, and the shaft body is threadedly connected to a limiting nut (17) after passing through the mounting hole. The limiting nut (17) is provided at an end of the shaft body away from the bearing to be tested, and the outer diameter of the limiting nut (17) is larger than the diameter of the mounting hole of the piston (4).

10. The rotary piston bidirectional loading device according to claim 9, characterized in that: The shaft body is plugged with a cotter pin (18) on the side of the limiting nut (17) facing away from the piston (4).

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