Gearbox sealing detection device and detection method

Abstract

This invention discloses a gearbox sealing performance testing device and method. The gearbox sealing performance testing device includes a sealing cover, which is sealed to the gearbox output end housing. Two through holes are formed on the side wall of the sealing cover, constituting a vacuum gauge mounting hole and a vacuum extraction hole, respectively. A vacuum gauge and a vacuum pump are respectively installed at the vacuum gauge mounting hole and the vacuum extraction hole. A testing method includes installing a vacuum gauge at the vacuum gauge mounting hole on the sealing cover and installing a vacuum extraction device at the vacuum extraction hole. While maintaining a set vacuum level within the sealing cover, a motor runs at a set speed for at least 30 minutes. After running, the suction tube of the vacuum extraction device is checked for oil mist generation. The beneficial effect of this invention is that by comprehensively judging the sealing performance of the gearbox output end, the gearbox sealing performance can be accurately determined during the bench test stage, avoiding the discovery of output end sealing problems only during gearbox operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detecting structure, in particular to a gear box sealing detection device and a detection method. BACKGROUND

[0002] With the rapid development of wind power industry in recent ten years, the semi-direct drive structure of wind power gear box is more and more, and gradually becomes the mainstream model. The structure of semi-direct drive is that the output structure of wind power speed-up box is directly connected with the motor, which brings great challenge to the sealing effect of the gear box.

[0003] At present, the sealing performance monitoring of the gear box of the wind turbine is only to judge whether there is oil leakage at the output end by regular observation. The sealing problem of the gear box can be observed only after the gear box leaks oil. The sealing of the gear box cannot be accurately determined in the stage of bench test. SUMMARY

[0004] The first purpose of the present application is to provide a gear box sealing detection device which can determine the sealing of the output end of the gear box in the stage of bench test. The second purpose is to provide a detection method for detecting the sealing of the output end of the gear box.

[0005] To achieve the above-mentioned first purpose, the present application adopts the following technical solutions.

[0006] A gear box sealing detection device comprises a sealing cover which is sealingly connected to the output end shell of the gear box. Two through holes are formed in the side wall of the sealing cover, and the two through holes respectively constitute a vacuum gauge mounting hole and a vacuum hole. A vacuum gauge and a vacuum pump are respectively installed at the vacuum gauge mounting hole and the vacuum hole.

[0007] The present application adopts the above-mentioned technical solutions. By sealingly connecting the sealing cover with the output end shell of the gear box, the sealing cover and the output end shell of the gear box form a sealed cavity. A vacuum gauge mounting hole is formed in the side wall of the sealing cover. The vacuum gauge is installed through the vacuum gauge mounting hole. The vacuum degree in the sealed cavity is detected by the vacuum gauge. The vacuum hole is provided. The vacuum pump can form negative pressure in the sealed cavity through the vacuum hole. By observing the change curve of the vacuum degree in the sealing cover, the sealing of the output end of the gear box can be determined. By observing whether the oil mist is sucked out of the suction pipe of the vacuum pump, the sealing of the output end of the gear box can be determined. If the sealing structure of the output end has a problem, the lubricating oil in the gear box will be sucked out under the action of negative pressure. If the sealing structure of the output end is good, it can still maintain the sealing effect under the action of negative pressure, and no oil mist will be sucked out. By comprehensively determining the sealing of the output end of the gear box, the sealing of the gear box can be accurately determined in the stage of bench test, so that the problem of the sealing of the output end of the gear box can be found in the working stage, the product quality is guaranteed, and the maintenance cost is reduced.

[0008] Preferably, the T-shaped coupling is connected with the output shaft of the gear box at one end and extends out of the sealing cover to be connected with the motor at the other end.

[0009] The T-shaped coupling is arranged to connect the output shaft of the gear box with the motor, so that the output shaft of the gear box is driven to rotate by starting the motor, and the sealing effect of the gear box under dynamic state is detected.

[0010] Preferably, a universal coupling is connected with the end of the T-shaped coupling away from the output shaft, and the other end of the universal coupling is connected with the output shaft of the motor.

[0011] The universal coupling is arranged to connect the T-shaped coupling with the motor, so that the working speed of the gear box is simulated by starting the motor, the working state of the gear box is simulated, and the accuracy of detecting the sealing effect of the output end is further improved.

[0012] Preferably, a connecting flange is connected with the end of the T-shaped coupling away from the output shaft and the end of the universal coupling away from the motor, and the T-shaped coupling and the universal coupling are connected through the connecting flange.

[0013] The connecting flange is arranged to connect the T-shaped coupling with the universal coupling, so as to ensure the strength and rigidity of the connecting point.

[0014] Preferably, a groove is formed at the end of the sealing cover connected with the gear box output end shell, and a sealing ring is installed in the groove.

[0015] In this way, the sealing ring is installed at the end of the sealing cover connected with the gear box output end shell, the connection is sealed, pressure relief from the connection during vacuumizing is prevented, a sealed cavity is formed between the gear box output end and the sealing cover, and the detection effect is affected.

[0016] Preferably, a sink is formed on the side wall of the through hole of the sealing cover for the T-shaped coupling, two rows of skeleton oil seals are installed in the sink, and the inner side of the skeleton oil seal is matched with the T-shaped coupling.

[0017] In this way, the sink is formed on the side wall of the through hole of the sealing cover for the T-shaped coupling, the skeleton oil seal is installed through the sink, the inner side of the skeleton oil seal is matched with the T-shaped coupling, the sealing effect between the sealing cover and the T-shaped coupling is ensured, and a sealed cavity is formed in the sealing cover.

[0018] Preferably, a groove is formed on the side wall away from the bottom of the sink, a hole clamp spring is installed in the groove, and the hole clamp spring abuts against the side surface of the skeleton oil seal.

[0019] Thus, by forming the recess on the side wall of the sink away from the bottom of the sink, and installing the hole clamping spring in the recess, the skeleton oil seal is axially positioned in the sink by the clamping spring.

[0020] To achieve the above-mentioned second object, the application adopts the following technical solutions.

[0021] A detection method based on the first purpose gear box sealing detection device, including detecting the change curve of the vacuum degree in the sealed cover, and when the vacuum degree in the sealed cover is kept at the set vacuum degree, the motor operates at the set rotating speed, and after operating for at least 30 minutes, it is detected whether oil mist is generated at the suction pipe of the vacuumizing equipment.

[0022] The application adopting the foregoing technical solutions, by installing the vacuum gauge and the vacuumizing equipment on the sealed cover, detecting the vacuum degree in the sealed cover through the vacuum gauge, observing the change curve of the vacuum degree in the sealed cover to judge the sealing property of the gear box output end, and simulating the working state of the gear box by making the motor operate at the set rotating speed under the set vacuum degree, and after operating for at least 30 minutes, detecting whether oil mist is generated at the suction pipe of the vacuumizing equipment, the sealing property of the gear box output end is comprehensively judged.

[0023] Preferably, the set rotating speed is the same as the actual working rotating speed of the gear box.

[0024] By setting the set rotating speed to be the same as the actual working rotating speed of the gear box, the actual rotating speed on the tower is simulated, and the accuracy of the test result is improved.

[0025] Preferably, the set vacuum degree is 30Pa-120Pa.

[0026] By setting the set vacuum degree to be less than or equal to 120Pa, whether oil mist is generated at the gear box output end under the vacuum pressure value is facilitated, and the sealing effect at the output end is verified.

[0027] The beneficial effects of this invention are as follows: The gearbox sealing performance testing device, by setting a sealing cover that is sealed to the output end housing of the gearbox, facilitates the formation of a sealed cavity between the sealing cover and the output end housing. A vacuum gauge mounting hole is formed on the side wall of the sealing cover, allowing for the installation of a vacuum gauge to detect the vacuum level within the sealed cavity. Furthermore, by providing a vacuum extraction hole, a vacuum pump can create negative pressure within the sealed cavity. If the sealing structure at the output end has a problem, the lubricating oil inside the gearbox will be drawn out under the negative pressure. If the sealing structure at the output end is effective, it will maintain its sealing effect under negative pressure, preventing oil mist from being drawn out. This allows for accurate determination of gearbox sealing performance during bench testing, avoiding the discovery of output end sealing problems only during gearbox operation, ensuring product quality, and reducing subsequent maintenance costs. The lubrication system is tested by installing a vacuum gauge and a vacuum pump on the sealing cover. The vacuum gauge is used to detect the vacuum level inside the sealing cover, and the vacuum pump is used to maintain the vacuum level inside the sealing cover at the set vacuum level. The motor runs at the set speed to simulate the working state of the gearbox. After running for at least 30 minutes, it is checked whether oil mist is generated at the suction pipe of the vacuum pump and the sealing performance of the gearbox output end is tested. Attached Figure Description

[0028] Figure 1 This is a structural diagram of the present invention;

[0029] Figure 2 This is the present invention. Figure 1 An enlarged view of part K in the image. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings, but this does not limit the invention to the scope of the embodiments described.

[0031] The reference numerals in the accompanying drawings include: sealing cover 1, vacuum gauge mounting hole 11, vacuum hole 12, T-type coupling 2, hole snap ring 3, universal coupling 4, connecting flange 5, skeleton oil seal 6, sealing ring 7, gearbox output end housing 8, output shaft 81, motor 9.

[0032] Example 1, see Figure 1 and Figure 2 A gearbox sealing performance testing device includes a sealing cover 1, which is sealed to the gearbox output end housing 8. Two through holes are formed on the side wall of the sealing cover 1, which respectively constitute a vacuum gauge mounting hole 11 and a vacuum extraction hole 12. A vacuum gauge and a vacuum pump are respectively installed at the vacuum gauge mounting hole 11 and the vacuum extraction hole 12.

[0033] Among them, see Figure 1 and Figure 2The T-shaped coupling 2 is connected with the output shaft 81 of the gear box at one end and connected with the motor 9 at the other end.

[0034] Referring to Figure 1 The T-shaped coupling 2 is connected with the output shaft 81 of the gear box at one end and connected with the motor 9 at the other end.

[0035] Referring to Figure 1 The T-shaped coupling 2 is connected with the output shaft 81 of the gear box at one end and connected with the motor 9 at the other end.

[0036] Referring to Figure 1 The sealing cover 1 is connected with the output end shell 8 of the gear box at one end and forms a recess, and the sealing ring 7 is installed in the recess.

[0037] Referring to Figure 1 and Figure 2 The sealing cover 1 is connected with the output shaft 81 of the gear box at one end and forms a recess, and the sealing ring 7 is installed in the recess.

[0038] The T-shaped coupling 2 is connected with the output shaft 81 of the gear box at one end and connected with the motor 9 at the other end.

[0039] The basic principles and main features of the present application and the advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A gear box tightness detection device, characterized by, The application relates to a gear box sealing detection device, which comprises a sealing cover (1) connected to a gear box output end shell (8), two through holes are formed in the side wall of the sealing cover (1), the two through holes respectively form a vacuum gauge mounting hole (11) and a vacuum pumping hole (12), a vacuum gauge and a vacuum pump are respectively arranged at the vacuum gauge mounting hole (11) and the vacuum pumping hole (12); a T-shaped coupling (2) is arranged at one end of the gear box output shaft (81); the other end of the T-shaped coupling (2) extends out of the sealing cover (1) and is connected with a motor (9); a universal coupling (4) is connected to the end of the T-shaped coupling (2) far away from the output shaft (81), the other end of the universal coupling (4) is connected with the output shaft (81) of the motor (9); the end of the T-shaped coupling (2) far away from the output shaft (81) and the end of the universal coupling (4) far away from the motor (9) are both connected with a connecting flange (5), the T-shaped coupling (2) and the universal coupling (4) are connected through the connecting flange (5); a recess is formed in the end of the sealing cover (1) connected with the gear box output end shell (8), a sealing ring (7) is arranged in the recess; a sunken platform is formed in the side wall of the through hole of the sealing cover (1) for the T-shaped coupling (2), two rows of skeleton oil seals (6) are arranged in the sunken platform, the inner side of the skeleton oil seals (6) is matched with the T-shaped coupling (2); a recess is formed in the side wall of the sunken platform far away from the bottom, a hole clamping spring (3) is arranged in the recess, and the hole clamping spring (3) abuts against the side surface of the skeleton oil seal (6).

2. A method of detection, characterized in that The gear box sealing detection device is based on claim 1, and the change curve of the vacuum degree in the sealing cover is detected, the vacuum degree in the sealing cover (1) is kept at the set vacuum degree, the motor (9) is operated at the set rotating speed, and whether oil mist is generated at the suction pipe of the vacuum pumping equipment is detected after the motor (9) is operated for at least 30 minutes.

3. The detection method according to claim 2, characterized in that, The set rotating speed is the same as the actual working rotating speed of the gear box.

4. The detection method according to claim 2, characterized in that, The set vacuum degree is 30 Pa to 120 Pa.

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