A test apparatus for testing motor seals

Abstract

This invention discloses a test apparatus for testing motor seals, comprising: a rotating shaft, a front end cover, a rear end cover, a bearing, a first sealing structure, and a second sealing structure. The front end cover and the rear end cover are connected. The bearing is disposed between the front end cover and the rotating shaft. The first sealing structure is disposed between the front end cover and the rotating shaft. The second sealing structure is disposed between the rear end cover and the rotating shaft. The bearing is disposed within a sealing cavity between the first sealing structure, the second sealing structure, the rotating shaft, the front end cover, and the rear end cover. The first sealing structure is disposed within the front end cover, and the second sealing structure is disposed within the rear end cover. The sealing performance of the first and second sealing structures is tested using a testing method, thereby guiding improvements to the first and second sealing structures to enhance their stability, simplify their structure, and reduce their cost.

Description

Technical Field

[0001] This invention relates to the field of sealing testing technology, and more specifically, to a test apparatus for testing the seals of motors. Background Technology

[0002] For submersible motors, the design of the sealing structure is a very important aspect. It can be said that the sealing design is the key technology in the design of submersible motors, and it is also the weakest part of the design. Many water leakage failures of submersible motors are caused by unstable sealing. The existing sealing structure design of submersible motors has poor stability, complex structure and high cost.

[0003] In summary, how to solve the problems of poor stability, complex structure and high cost of existing submersible motor sealing structure design is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a test device for testing motor seals, which can provide improvement instructions for the sealing structure of submersible motors, thereby solving the problems of poor stability, complex structure and high cost of existing submersible motor sealing structure designs.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A test apparatus for testing the seal of a motor includes: a rotating shaft, a front end cover, a rear end cover, a bearing, a first sealing structure, and a second sealing structure. The front end cover is connected to the rear end cover. The bearing is disposed between the front end cover and the rotating shaft. The first sealing structure is disposed between the front end cover and the rotating shaft. The second sealing structure is disposed between the rear end cover and the rotating shaft. The bearing is disposed within a sealing cavity between the first sealing structure, the second sealing structure, the rotating shaft, the front end cover, and the rear end cover. The first sealing structure is disposed within the front end cover, and the second sealing structure is disposed within the rear end cover.

[0007] Preferably, the front end cover is provided with a first protrusion facing the rear end cover, and a third sealing structure is provided between the outer periphery of the first protrusion and the inner periphery of the rear end cover.

[0008] Preferably, the third sealing structure includes an annular groove disposed on the outer periphery of the first boss and a sealing ring disposed in the annular groove, wherein the outer periphery of the sealing ring protrudes from the annular groove.

[0009] Preferably, the outer periphery of the rotating shaft is provided with a second boss, the first boss is provided with a third boss facing the rear end cover, the inner ring of the bearing is fitted onto the outer periphery of the second boss, and the outer periphery of the outer ring of the bearing is fitted onto the inner periphery of the third boss.

[0010] Preferably, the first sealing structure includes a first lip seal, a second lip seal, and a first seal pressure plate. The first lip seal and the second lip seal are both disposed between the front end cover and the rotating shaft. The first lip seal is disposed outside the second lip seal, and the first seal pressure plate is disposed outside the first lip seal. The first seal pressure plate is connected to the front end cover. A first axial limiting protrusion is provided on the inner circumference of the front end cover. The first axial limiting protrusion is disposed inside the second lip seal.

[0011] Preferably, the second sealing structure includes a third lip seal, a fourth lip seal, and a second oil seal pressure plate. The third lip seal and the fourth lip seal are both disposed between the rear end cover and the rotating shaft. The third lip seal is disposed outside the fourth lip seal, and the second oil seal pressure plate is disposed outside the fourth lip seal. The second oil seal pressure plate is connected to the rear end cover. A second axial limiting protrusion is provided on the inner circumference of the rear end cover, and the second axial limiting protrusion is located inside the fourth lip seal.

[0012] Preferably, the first oil seal plate is connected to the front end cover by a first screw, and the second oil seal plate is connected to the rear end cover by a second screw.

[0013] Preferably, both ends of the rotating shaft are provided with connecting screw holes.

[0014] Preferably, the inner and outer circumferences of the front end cover and the inner and outer circumferences of the rear end cover are coated with a sealant.

[0015] Preferably, the front end cover and the rear end cover are connected by a third screw.

[0016] During testing, the test device for the submersible motor seal is placed in a water tank of a certain depth. The tank can contain colored or salt spray-corrosive media to simulate a special aquatic environment for the submersible motor. A drive mechanism rotates the shaft, and by changing the speed of the drive mechanism, the test device is subjected to rotational motion at different speeds. After the test, the test device is disassembled to check for leakage and contamination in the sealing cavity, thereby guiding and optimizing the sealing structure design of the submersible motor.

[0017] The shaft system structure composed of the rotating shaft and bearings is similar to that of a submersible motor shaft system. After the front and rear covers are connected, it resembles the housing of a submersible motor. The sealing cavity formed between the front and rear covers, the first sealing structure, the second sealing structure, and the rotating shaft is a sealing cavity structure similar to that of a submersible motor. The sealing performance of the first and second sealing structures is tested through testing methods to verify the cavity sealing effect. This ensures the feasibility of the test device for testing motor sealing to simulate the sealing of a submersible motor, thereby guiding the improvement of the first and second sealing structures to enhance their stability, simplify their structure, and reduce their cost. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the test apparatus for testing motor seals provided by the present invention.

[0020] Figure 1 middle:

[0021] 1-Rotating shaft, 2-First screw, 3-First oil seal pressure plate, 4-Front end cover, 5-Third screw, 6-First lip seal, 7-Sealing ring, 8-Second lip seal, 9-Rear end cover, 10-Second oil seal pressure plate, 11-Second screw, 12-Third lip seal, 13-Fourth lip seal, 14-Bearing, 15-Third sealing cavity, 16-First sealing cavity, 17-Second sealing cavity. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The core of this invention is to provide a test device for testing motor seals. This test device can provide improvement instructions for the sealing structure of submersible motors, thereby solving the problems of poor stability, complex structure and high cost of existing submersible motor sealing structure designs.

[0024] Please refer to Figure 1 A test device for testing the seal of a motor includes: a rotating shaft 1, a front cover 4, a rear cover 9, a bearing 14, a first sealing structure, and a second sealing structure. The front cover 4 is connected to the rear cover 9. The bearing 14 is disposed between the front cover 4 and the rotating shaft 1. The first sealing structure is disposed between the front cover 4 and the rotating shaft 1. The second sealing structure is disposed between the rear cover 9 and the rotating shaft 1. The bearing 14 is disposed in a sealing cavity between the first sealing structure, the second sealing structure, the rotating shaft 1, the front cover 4, and the rear cover 9. The first sealing structure is disposed in the front cover 4, and the second sealing structure is disposed in the rear cover 9.

[0025] It should be noted that the outer diameters of the front cover 4 and the rear cover 9 are the same. The front end face of the rear cover 9 is fitted to the annular mounting surface of the front cover 4. The front cover 4 and the rear cover 9 are coaxially arranged. The center of the front cover 4 and the rear cover 9 are provided with shaft holes. The two shaft holes are coaxially arranged. The rotating shaft 1 passes through the two shaft holes at the same time. The two ends of the rotating shaft 1 protrude from the front cover 4 and the rear cover 9 respectively, so as to facilitate connection with the external drive device.

[0026] The rotating shaft 1 passes through both the front cover 4 and the rear cover 9. The first sealing structure is located between the front inner circumference of the front cover 4 and the rotating shaft 1, and the second sealing structure is located between the rear inner circumference of the rear cover 9 and the rotating shaft 1, so as to form a sealing cavity between the front cover 4, the rear cover 9, the first sealing structure, the second sealing structure and the rotating shaft 1. The bearing 14 is located in the sealing cavity.

[0027] During installation, the bearing 14 is mounted on the rotating shaft 1, with the rotating shaft 1 bearing the outer ring to ensure smooth rotation of the bearing 14. After heating the front cover 4 to 70℃-100℃, the front cover 4 and the rear cover 9 are mounted on the rotating shaft 1, and the bearing 14 is installed in the bearing 14 chamber. Rotating the rotating shaft 1 ensures smooth rotation of the shaft system.

[0028] During testing, the test device for the motor seal is placed in a water tank of a certain depth. The tank can contain colored or salt spray corrosive media to simulate the special aquatic environment of the submersible motor. A drive mechanism drives the rotating shaft 1 to rotate, and by changing the speed of the drive mechanism, the test device is subjected to rotational motion at different speeds. After the test is completed, the test device is disassembled to check for leakage and contamination in the sealing cavity, thereby guiding and optimizing the design of the first and second sealing structures.

[0029] The shaft system structure composed of rotating shaft 1 and bearing 14 is similar to that of a submersible motor shaft system. The front cover 4 and rear cover 9, after being connected, are similar to the housing of a submersible motor. The sealing cavity formed between the front cover 4, rear cover 9, first sealing structure, second sealing structure and rotating shaft 1 is a sealing cavity structure similar to that of a submersible motor. The sealing performance of the first sealing structure and the second sealing structure is tested by testing methods to accept the cavity sealing effect, so as to ensure the feasibility of the test device for testing motor sealing to simulate the sealing of a submersible motor. This provides guidance for the improvement of the first sealing structure and the second sealing structure, so as to improve the stability of the first sealing structure and the second sealing structure, simplify the structure of the first sealing structure and the second sealing structure, and reduce the cost of the first sealing structure and the second sealing structure.

[0030] The foregoing content describes the test method and structure for testing the dynamic seal of a motor. To facilitate testing the sealing performance of the static seal of the motor, as a further preferred embodiment, the front cover 4 is provided with a first protrusion facing the rear cover 9, and a third sealing structure is provided between the outer periphery of the first protrusion and the inner periphery of the rear cover 9. During installation, the front cover 4 and the rear cover 9 need to be installed on the rotating shaft 1 respectively before connecting them. Therefore, a third sealing structure is required between the front cover 4 and the rear cover 9 to ensure sealing performance. When the rotating shaft 1 rotates, the third sealing structure is stationary. During testing, the leakage and contamination of the sealing cavity can be checked to guide and optimize the design of the third sealing structure.

[0031] Based on the above embodiments, as a further preferred embodiment, the third sealing structure includes an annular groove disposed on the outer periphery of the first boss and a sealing ring 7 disposed within the annular groove, with the outer periphery of the sealing ring 7 protruding from the annular groove. The annular groove is disposed circumferentially along the outer periphery of the first boss, and the sealing ring 7 is an O-ring. After the front end cover 4 and the rear end cover 9 are assembled, the inner periphery of the rear end cover 9 presses the sealing ring 7 against the annular groove, thereby improving the sealing performance between the front end cover 4 and the rear end cover 9. The third sealing structure provided in this embodiment is simple in structure, easy to process, and has a low cost.

[0032] Based on the above embodiments, as a further preferred embodiment, a second boss is provided on the outer periphery of the rotating shaft 1, and a third boss is provided on the first boss facing the rear end cover 9. The inner ring of the bearing 14 is fitted onto the outer periphery of the second boss, and the outer periphery of the outer ring of the bearing 14 is fitted against the inner periphery of the third boss. The third boss and the second boss are arranged opposite to each other. When the rotating shaft 1 rotates, the rotating shaft 1 drives the inner ring of the bearing 14 to rotate through the second boss, while the outer ring of the bearing 14 does not rotate under the fixing effect of the third boss.

[0033] The sealing cavity includes a first sealing cavity 16 between the first boss and the first sealing structure, a second sealing cavity 17 between the first boss and the second sealing structure, and a third sealing cavity 15 between the front end cover 4 and the rear end cover 9.

[0034] Based on the above embodiments, as a further preferred embodiment, the first sealing structure includes a first lip oil seal 6, a second lip oil seal 8, and a first oil seal pressure plate 3. The first lip oil seal 6 and the second lip oil seal 8 are both disposed between the front end cover 4 and the rotating shaft 1. The first lip oil seal 6 is disposed outside the second lip oil seal 8, and the first oil seal pressure plate 3 is disposed outside the first lip oil seal 6. The first oil seal pressure plate 3 is connected to the front end cover 4. A first axial limiting protrusion is provided on the inner circumference of the front end cover 4. The first axial limiting protrusion is disposed inside the second lip oil seal 8. During installation, a specific oil seal installation fixture is used to install the second lip seal 8 with its inner lip facing outward to the outer circumference of the rotating shaft 1 outside the second boss, and to install the first lip seal 6 with its inner lip facing inward to the outer circumference of the rotating shaft 1 outside the second lip seal 8. The outer circumferences of both the first lip seal 6 and the second lip seal 8 are fitted against the inner circumference of the front end cover 4, so that the first lip seal 6 and the second lip seal 8 form a curved sealing ring. The first oil seal pressure plate 3 is installed on the front end face of the front end cover 4. The inner diameter of the first oil seal pressure plate 3 is smaller than the outer diameter of the first lip seal 6, and the inner diameter of the first axial limiting protrusion is smaller than the outer diameter of the second lip seal 8, thereby limiting the first lip seal 6 and the second lip seal 8 in the axial direction and achieving stable installation.

[0035] Based on the above embodiments, as a further preferred embodiment, the second sealing structure includes a third lip oil seal 12, a fourth lip oil seal 13, and a second oil seal pressure plate 10. The third lip oil seal 12 and the fourth lip oil seal 13 are both disposed between the rear end cover 9 and the rotating shaft 1. The third lip oil seal 12 is disposed outside the fourth lip oil seal 13, and the second oil seal pressure plate 10 is disposed outside the fourth lip oil seal 13. The second oil seal pressure plate 10 is connected to the rear end cover 9. A second axial limiting protrusion is provided on the inner circumference of the rear end cover 9, and the second axial limiting protrusion is located inside the fourth lip oil seal 13.

[0036] During installation, a specific oil seal installation fixture is used to install the fourth lip oil seal 13 with its inner lip facing outward to the outer circumference of the rotating shaft 1 on the other side of the second boss. The third lip oil seal 12 with its inner lip facing inward is installed to the outer circumference of the rotating shaft 1 on the outer side of the fourth lip oil seal 13. The outer circumferences of the third lip oil seal 12 and the fourth lip oil seal 13 are both in contact with the inner circumference of the rear end cover 9, so that the third lip oil seal 12 and the fourth lip oil seal 13 form a curved sealing ring. The second oil seal pressure plate 10 is installed on the rear end face of the rear end cover 9. The inner diameter of the second oil seal pressure plate 10 is smaller than the outer diameter of the third lip oil seal 12, and the inner diameter of the second axial limiting protrusion is smaller than the outer diameter of the fourth lip oil seal 13, thereby limiting the third lip oil seal 12 and the fourth lip oil seal 13 in the axial direction and achieving stable installation.

[0037] Based on the above embodiments, as a further preferred embodiment, the first oil seal pressure plate 3 is connected to the front end cover 4 by the first screw 2, and the second oil seal pressure plate 10 is connected to the rear end cover 9 by the second screw 11. A first conical hole is provided on the first oil seal pressure plate 3, a first countersunk hole is provided on the front end face of the front end cover 4, a second conical hole is provided on the second oil seal pressure plate 10, and a second countersunk hole is provided on the rear end face of the rear end cover 9. The first screw 2 passes through both the first conical hole and the first countersunk hole, and the second screw 11 passes through both the second conical hole and the second countersunk hole. The top of the first screw 2 is flush with the surface of the first oil seal pressure plate 3, and the top of the second screw 11 is flush with the surface of the second oil seal pressure plate 10.

[0038] Based on the above embodiments, as a further preferred embodiment, both ends of the rotating shaft 1 are provided with connecting screw holes to facilitate connection with an external driving device. The driving screw of the external driving device is connected to the connecting screw holes, which can drive the rotating shaft 1 to rotate.

[0039] Based on the above embodiments, as a further preferred embodiment, the inner and outer circumferences of the front cover 4 and the rear cover 9 are coated with a sealant. The sealant has a certain sealing and filling effect and a lubricating effect, and also has a certain degree of adhesion, further improving the sealing performance and installation stability between the front cover 4 and the rear cover 9. Preferably, the inner lip cavities of the first lip seal 6, the second lip seal 8, the third lip seal 12, and the fourth lip seal 13 are all coated with a sealant.

[0040] Based on the above embodiments, as a further preferred embodiment, the front cover 4 and the rear cover 9 are connected by a third screw 5. A first screw hole is provided on the outer ring of the front end face of the front cover 4, and a second screw hole is provided on the front end face of the rear cover 9. The first screw hole and the second screw hole are directly opposite each other. The third screw 5 passes through both the first screw hole and the second screw hole simultaneously to connect the front cover 4 and the rear cover 9.

[0041] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0042] The above provides a detailed description of the testing apparatus for testing motor seals provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A test apparatus for testing the seal of an electric machine, characterized in that, For use in immersion in a water tank during testing, the device includes: a rotating shaft (1), a front cover (4), a rear cover (9), a bearing (14), a first sealing structure, and a second sealing structure. The front cover (4) is connected to the rear cover (9). The bearing (14) is disposed between the front cover (4) and the rotating shaft (1). The first sealing structure is disposed between the front cover (4) and the rotating shaft (1). The second sealing structure is disposed between the rear cover (9) and the rotating shaft (1). The bearing (14) is disposed in a sealing cavity between the first sealing structure, the second sealing structure, the rotating shaft (1), the front cover (4), and the rear cover (9). The first sealing structure is disposed on the front cover (4), and the second sealing structure is disposed on the rear cover (9). The rotating shaft (1) is connected to an external driving device.

2. The test apparatus for testing motor seals according to claim 1, characterized in that, The front end cover (4) is provided with a first protrusion facing the rear end cover (9), and a third sealing structure is provided between the outer periphery of the first protrusion and the inner periphery of the rear end cover (9).

3. The test apparatus for testing motor seals according to claim 2, characterized in that, The third sealing structure includes an annular groove disposed on the outer periphery of the first boss and a sealing ring (7) disposed in the annular groove, wherein the outer periphery of the sealing ring (7) protrudes from the annular groove.

4. The test apparatus for testing motor seals according to claim 2, characterized in that, The outer periphery of the rotating shaft (1) is provided with a second boss, the first boss is provided with a third boss facing the rear end cover (9), the inner ring of the bearing (14) is fitted on the outer periphery of the second boss, and the outer periphery of the outer ring of the bearing (14) is attached to the inner periphery of the third boss.

5. The test apparatus for testing motor seals according to claim 1, characterized in that, The first sealing structure includes a first lip seal (6), a second lip seal (8), and a first oil seal pressure plate (3). The first lip seal (6) and the second lip seal (8) are both disposed between the front end cover (4) and the rotating shaft (1). The first lip seal (6) is disposed outside the second lip seal (8). The first oil seal pressure plate (3) is disposed outside the first lip seal (6). The first oil seal pressure plate (3) is connected to the front end cover (4). The inner circumference of the front end cover (4) is provided with a first axial limiting protrusion. The first axial limiting protrusion is disposed inside the second lip seal (8).

6. The test apparatus for testing motor seals according to claim 5, characterized in that, The second sealing structure includes a third lip seal (12), a fourth lip seal (13), and a second oil seal pressure plate (10). The third lip seal (12) and the fourth lip seal (13) are both disposed between the rear end cover (9) and the rotating shaft (1). The third lip seal (12) is disposed outside the fourth lip seal (13). The second oil seal pressure plate (10) is disposed outside the fourth lip seal (13). The second oil seal pressure plate (10) is connected to the rear end cover (9). A second axial limiting protrusion is provided on the inner circumference of the rear end cover (9). The second axial limiting protrusion is located inside the fourth lip seal (13).

7. The test apparatus for testing motor seals according to claim 6, characterized in that, The first oil seal pressure plate (3) is connected to the front end cover (4) by the first screw (2), and the second oil seal pressure plate (10) is connected to the rear end cover (9) by the second screw (11).

8. The test apparatus for testing motor seals according to claim 1, characterized in that, Both ends of the rotating shaft (1) are provided with connecting screw holes.

9. The test apparatus for testing motor seals according to any one of claims 1 to 8, characterized in that, The inner and outer circumferences of the front end cover (4) and the inner and outer circumferences of the rear end cover (9) are coated with sealant.

10. The test apparatus for testing motor seals according to claim 1, characterized in that, The front end cover (4) and the rear end cover (9) are connected by a third screw (5).

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