Self-lubricating precise centering device for preventing eccentric wear leakage of oil seal of hydraulic servo-motor

Abstract

The utility model discloses a self-lubricating precise centering device for preventing eccentric wear and leakage of a hydraulic servo-motor oil seal, which comprises a spherical universal rotating bearing hinged between a hydraulic servo-motor rod and a control valve connecting rod, and the bottom end of the hydraulic servo-motor rod is provided with the hydraulic servo-motor oil seal; the surface of the hydraulic servo-motor rod is sleeved with the hydraulic servo-motor end barrel cover, and the bottom end of the control valve connecting rod is inserted into the inner side of the hydraulic servo-motor end barrel cover; according to the self-lubricating centering device, the self-lubricating centering device is additionally arranged at the control valve rod, so that the stress acting point of the circumferential force generated when the control valve rod moves up and down is transferred to the guide bushing of the centering device from the oil seal of the hydraulic servo-motor; after circumferential force imbalance and horizontal displacement of the control valve connecting rod are restrained, the perpendicularity of the connected hydraulic servo-motor rod is guaranteed through the automatic alignment function of the spherical universal rotating bearing, the hydraulic servo-motor rod is only subjected to axial force and does vertical movement, and the equipment operation fault of hydraulic servo-motor pressure oil leakage caused by eccentric wear of a hydraulic servo-motor oil seal is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil motor oil seals, and particularly relates to a self-lubricating precise centering device for preventing eccentric wear and leakage of oil motor oil seals. Background Art

[0002] The low-pressure governor valve rod of a small steam turbine and the oil motor are connected and driven in a lever form. This driving method will cause uneven circumferential force on the oil motor rod during its up and down movement, resulting in eccentric wear of the oil motor oil seal and leakage of pressure oil. For example, when the oil motor rod pushes up the governor valve rod, the pin connection moves upward in an arc with the lever fulcrum as the center, causing the oil motor rod to receive a force in the left direction. The acting point of the force is on the oil seal, and the direction is to the left, which will cause eccentric wear of the oil motor oil seal and leakage of the pressure oil inside the oil motor. When the oil motor rod pulls down the governor valve rod, the pin connection moves downward in an arc with the lever fulcrum as the center, causing the oil motor rod to receive a force in the right direction. The acting point of the force is on the oil seal, and the direction is to the right, which will cause eccentric wear of the oil motor oil seal and leakage of the pressure oil inside the oil motor. Therefore, the utility model proposes a self-lubricating precise centering device for preventing eccentric wear and leakage of oil motor oil seals. Content of the Utility Model

[0003] The purpose of the utility model is to provide a self-lubricating precise centering device for preventing eccentric wear and leakage of oil motor oil seals, so as to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A self-lubricating precise centering device for preventing eccentric wear and leakage of oil motor oil seals, comprising

[0005] A spherical universal rotating bearing hinged between the oil motor rod and the governor valve connecting rod, and an oil motor oil seal is arranged at the bottom end of the oil motor rod;

[0006] An oil motor end cylinder cover sleeved on the surface of the oil motor rod, and the bottom end of the governor valve connecting rod is inserted into the inner side of the oil motor end cylinder cover;

[0007] A self-lubricating centering device installed at the top end of the oil motor end cylinder cover, and the governor valve connecting rod passes through the self-lubricating centering device;

[0008] A lever installed between the governor valve rod and the governor valve connecting rod.

[0009] Preferably, the self-lubricating centering device includes a guide bushing, an annular grease groove opened on the inner wall of the guide bushing, and an oil storage sac opened on the top surface of the guide bushing and communicated with the annular grease groove.

[0010] Preferably, an installation groove adapted to the guide bushing is opened at the top end of the oil motor end cylinder cover.

[0011] Preferably, a sealing piece is rotatably installed on the top surface of the oil actuator end cylinder cover relative to one side of the installation groove, and the right end of the sealing piece extends above the oil storage bladder to cover the oil storage bladder. A shaft rod is fixed on the top surface of the oil actuator end cylinder cover relative to one side of the installation groove, and the left end of the sealing piece is rotatably sleeved on the shaft rod. A blocking block is arranged at the bottom of the right end of the sealing piece, and the blocking block is embedded in the oil storage bladder.

[0012] Preferably, a connecting axle pin is arranged at the connection between the lever and the throttle link, and the lever is hinged to the throttle valve rod. The lever is rotatably installed on one side of the throttle valve rod through a fulcrum.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: By installing a self-lubricating centering device at the throttle valve rod, the acting point of the circumferential force generated during the up and down movement of the throttle valve rod is transferred from the oil seal of the oil actuator to the guide bushing of the centering device. After restraining the unbalanced circumferential force and horizontal displacement of the throttle link, the automatic alignment function of the spherical universal rotating bearing is utilized to ensure the perpendicularity of the oil actuator rod after connection, enabling the oil actuator rod to only receive axial force and perform vertical movement, avoiding equipment operation failures such as eccentric wear of the oil actuator oil seal resulting in leakage of the pressure oil of the oil actuator. Moreover, the guide bushing of the centering device is designed with an annular lubricating groove and uses high-temperature resistant grease for self-lubrication. Grease is filled once and no maintenance is required, avoiding jamming during the operation of the throttle valve rod. Description of the Drawings

[0014] Figure 1 is a structural schematic diagram of the present utility model;

[0015] Figure 2 is a structural schematic diagram of the self-lubricating centering device of the present utility model;

[0016] Figure 3 is a structural schematic diagram of the spherical universal rotating joint of the present utility model;

[0017] In the figure: 1. Throttle valve rod; 2. Lever; 21. Fulcrum; 3. Oil actuator oil seal; 4. Throttle link; 5. Connecting axle pin; 6. Self-lubricating centering device; 61. Guide bushing; 62. Annular grease groove; 63. Oil storage bladder; 7. Spherical universal rotating bearing; 8. Oil actuator end cylinder cover; 81. Installation groove; 82. Shaft rod; 83. Blocking block; 84. Sealing piece; 9. Oil actuator rod. Detailed Embodiment

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] Embodiment

[0020] Please refer to Figures 1 to 3 , which is an embodiment of the present utility model. This embodiment provides a technical solution: a self-lubricating precise centering device for preventing eccentric wear and leakage of the oil motor oil seal, including

[0021] A spherical universal rotating bearing 7 hinged between the oil motor rod 9 and the valve linkage 4. The lower end of the valve linkage 4 is rotatably connected to the oil motor rod 9 through the spherical universal rotating bearing 7. The design of the spherical universal rotating bearing 7 can help the valve linkage 4 automatically align, and an oil motor oil seal 3 is provided at the bottom end of the oil motor rod 9;

[0022] An oil motor end cylinder cover 8 sleeved and installed on the surface of the oil motor rod 9, and the bottom end of the valve linkage 4 is inserted into the inner side of the oil motor end cylinder cover 8;

[0023] A self-lubricating centering device 6 installed at the top end of the oil motor end cylinder cover 8, and the valve linkage 4 passes through the self-lubricating centering device 6;

[0024] A lever 2 installed between the valve stem 1 and the valve linkage 4.

[0025] Among them, the self-lubricating centering device 6 includes a guide bushing 61, an annular grease groove 62 opened on the inner wall of the guide bushing 61, and an oil storage bladder 63 opened on the top surface of the guide bushing 61 and communicating with the annular grease groove 62. The guide bushing 61 is made of single brass material. The surface roughness R3.2 of the machined surface of the through hole of the guide bushing 61, the guide length is 100 mm. The design of the oil storage bladder 63 enables the self-lubricating centering device 6 to have the function of storing grease, and the design of the annular grease groove 62 can provide self-lubrication for the valve linkage 4 in the circumferential direction.

[0026] Among them, an installation groove 81 adapted to the guide bushing 61 is provided at the top end of the oil motor end cylinder cover 8 for installing the guide bushing 61. The guide bushing 61 is installed in the installation groove 81 by means of threads, and the threaded joint needs to be riveted to prevent the guide sleeve from loosening during operation, ensuring the concentricity between the guide bushing 61 and the oil motor rod 9 is 0.05 mm. After the throttle link 4 passes through the guide bushing 61 later, it is ensured that the clearance between the throttle link 4 and the guide bushing 61 is less than 0.05 mm, ensuring that the throttle link 4 can only move up and down but not circumferentially after being guided by the guide bushing 61. After the installation transformation, it is ensured that the oil motor does not have the phenomenon of oil seal eccentric wear within a major overhaul period. Before the transformation, the oil motor needed to be maintained 4 - 5 times within a major overhaul period, with a cost of about 40,000 - 50,000 yuan. After the transformation, the oil motor is maintained once within a major overhaul period, with a cost of 10,000 yuan. Before the transformation, due to the oil seal eccentric wear and oil leakage of the oil motor, the equipment was shut down, causing an economic loss of hundreds of thousands of yuan for each power grid assessment. After the transformation, it can prevent the oil seal eccentric wear and oil leakage accident of the oil motor within a major overhaul period of a device.

[0027] Among them, a sealing piece 84 is also rotatably installed on one side of the top surface of the oil motor end cylinder cover 8 relative to the installation groove 81, and the right end of the sealing piece 84 extends above the oil storage bladder 63 to cover the oil storage bladder 63. A shaft rod 82 is fixed on one side of the top surface of the oil motor end cylinder cover 8 relative to the installation groove 81, and the left end of the sealing piece 84 is rotatably sleeved on the shaft rod 82. A plug 83 is arranged at the bottom of the right end of the sealing piece 84, and both are made of rubber material and will undergo elastic deformation when squeezed. The plug 83 is embedded in the oil storage bladder 63, which can effectively block the top end of the oil storage bladder 63 to prevent foreign objects from entering. When lubricating grease needs to be added to the oil storage bladder 63 later, only need to lift the sealing piece 84, causing the sealing piece 84 to undergo elastic deformation and the plug 83 to move out of the oil storage bladder 63, and then rotate and remove 64 from the top of the self-lubricating centering device 6, so that the oil storage bladder 63 is no longer blocked. At this time, lubricating grease can be added to the oil storage bladder 63.

[0028] Among them, a connecting shaft pin 5 is arranged at the connection between the lever 2 and the throttle link 4, and the lever 2 is hinged to the throttle valve rod 1. The lever 2 is rotatably installed on one side of the throttle valve rod 1 through a fulcrum 21.

[0029] Although the embodiments of the present invention have been shown and described (see the above detailed description), for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-lubricating precision centering device for preventing eccentric wear and leakage of oil seal of oil motive machine, characterized by: include A spherical universal bearing (7) is hinged between the oil motor rod (9) and the valve adjustment connecting rod (4), and an oil motor oil seal (3) is arranged at the bottom end of the oil motor rod (9); An oil motor end cylinder cover (8) is sleeved and mounted on the surface of an oil motor rod (9), and the bottom end of the valve regulating connecting rod (4) is inserted into the inner side of the oil motor end cylinder cover (8); A self-lubricating centering device (6) is installed on the top of the end cylinder cover (8) of the oil motor, and the valve adjustment connecting rod (4) passes through the self-lubricating centering device (6); A lever (2) is installed between a valve regulating rod (1) and a valve regulating connecting rod (4).

2. A self-lubricating precision centering device for preventing eccentric wear and leakage of oil seal of oil motive machine according to claim 1, characterized in that: The self-lubricating centering device (6) comprises a guide bushing (61), an annular grease groove (62) provided on the inner wall of the guide bushing (61), and an oil storage bag (63) provided on the top surface of the guide bushing (61) and communicating with the annular grease groove (62).

3. A self-lubricating precision centering device for preventing eccentric wear and leakage of oil seal of oil motive machine according to claim 1, characterized in that: The top end of the oil motor end barrel cover (8) is provided with a mounting groove (81) adapted to the guide bushing (61).

4. A self-lubricating precision centering device for preventing eccentric wear and leakage of oil seal of oil motive machine according to claim 1, characterized in that: A sealing piece (84) is also rotatably mounted on the top surface of the oil motor end barrel cover (8) relative to one side of the mounting groove (81), and the right end of the sealing piece (84) extends to the top of the oil storage bag (63) to cover the oil storage bag (63).

5. A self-lubricating precision centering device for preventing eccentric wear and leakage of oil seal of oil motive machine according to claim 4, characterized in that: A shaft rod (82) is fixed to one side of the top surface of the oil motor end barrel cover (8) relative to the mounting groove (81), and the left end of the sealing sheet (84) is rotatably sleeved on the shaft rod (82).

6. A self-lubricating precision centering device for preventing eccentric wear and leakage of oil seal of oil motive machine according to claim 4, characterized in that: A blocking block (83) is provided at the bottom of the right end of the sealing sheet (84), and the blocking block (83) is embedded in the oil storage bag (63).

7. A self-lubricating precision centering device for preventing eccentric wear and leakage of oil seal of oil motive machine according to claim 1, characterized in that: A connecting shaft pin (5) is provided at the connection point between the lever (2) and the door adjustment connecting rod (4), and the lever (2) is hinged to the door adjustment rod (1).

8. The self-lubricating precision centering device for preventing eccentric wear and leakage of oil seal of oil motive machine according to claim 1, characterized in that: The lever (2) is rotatably mounted on one side of the door adjustment rod (1) via a fulcrum (21).

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