Mechanical dynamic seal structure, motor dynamic seal mounting structure and seal testing device

Abstract

The present application relates to oil and gas drilling technology field, especially mechanical dynamic sealing structure, motor dynamic sealing installation structure and sealing test device, including coaxial mechanical dynamic sealing static ring and mechanical dynamic sealing dynamic ring, the inner side of mechanical dynamic sealing static ring is equipped with mechanical dynamic sealing static ring support, the inner side of mechanical dynamic sealing dynamic ring is equipped with mechanical dynamic sealing dynamic ring support, one end of mechanical dynamic sealing static ring support is equipped with first annular groove, and static ring alloy ring is arranged in the first annular groove, one end of mechanical dynamic sealing dynamic ring support is equipped with second annular groove, and dynamic ring alloy ring is arranged in the second annular groove, static ring alloy ring and dynamic ring alloy ring sealing rotation abut, the other end of mechanical dynamic sealing dynamic ring is fixedly provided with expansion ring in the inner side, and sealing top cover is sealingly fixed to the end of the other end of mechanical dynamic sealing dynamic ring.The static ring alloy ring and dynamic ring alloy ring rotate each other, realize dynamic sealing through oil film, improve sealing effect, and can be suitable for high temperature and high pressure and sealing under harsh working environment.

Description

Technical Field

[0001] This invention relates to the field of oil and gas drilling technology, and in particular to mechanical dynamic sealing structures, electric motor dynamic sealing installation structures, and sealing testing devices. Background Technology

[0002] With the development of the petroleum industry, oil extraction has gradually expanded from shallow to deep reservoirs, placing new demands on oil extraction technologies. In deep oil extraction, the location of reservoirs and the need for unconventional oil and gas drilling necessitate more complex drilling techniques. Rotary steerable drilling technology, developed in the late 20th century, is a cutting-edge automated drilling technology primarily used for directional drilling of special wells such as horizontal wells, ultra-deep wells, extended reach wells, and challenging directional wells. It can automatically and flexibly adjust well inclination and azimuth, offering high control precision and strong drilling capabilities, achieving automated drilling and representing the highest level of drilling technology development in the world today.

[0003] The working environment downhole in oil drilling is extremely harsh. The temperature and pressure of the drilling fluid gradually increase with the depth of the well. The drilling fluid contains solid phases such as sand and rock cuttings, as well as other chemical substances. These factors directly affect the sealing effect of downhole tools. Currently, there are still many problems with the design of dynamic seals for directional tools in China. In particular, the sealing performance of seals under such high temperature, high pressure and harsh working conditions is far from meeting the specified sealing requirements.

[0004] Currently, research on dynamic sealing structures and lubrication performance in commonly used downhole high-temperature and high-pressure environments mainly focuses on three aspects: bearing seals of roller cone heads, lower end seals of guide tools, and seals of non-downhole power drill bits. The structural performance of the seals mainly adopts rubber seals.

[0005] Rubber seals refer to the sealing of a relatively rotating space using rubber components while ensuring the continuity of rotation. The biggest problem with rubber seals is the temperature resistance, wear resistance, and volume change of rubber with temperature. As a non-metallic material, rubber's volume and compressibility change significantly with temperature. When a dynamic sealing mechanism moves, the rubber, as the sealing medium, comes into contact with the metal parts and is compressed to achieve the sealing function. This generates significant friction, which is converted into heat. As the temperature rises, the rubber expands, increasing frictional resistance. High friction generates even more heat, ultimately leading to wear of the rubber components and failure of the seal. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a mechanical dynamic seal structure, an electric motor dynamic seal installation structure and a seal testing device. The mechanical seal method forms a seal through a smooth metal surface, and at the same time, the oil film coverage greatly reduces frictional resistance and improves the service life of the dynamic seal.

[0007] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A mechanical dynamic seal structure includes a mechanical dynamic seal stationary ring and a mechanical dynamic seal rotating ring arranged coaxially. A mechanical dynamic seal stationary ring support is provided on the inner side of one end of the mechanical dynamic seal stationary ring facing the mechanical dynamic seal rotating ring, and the mechanical dynamic seal stationary ring support is synchronously rotated with the mechanical dynamic seal stationary ring. A mechanical dynamic seal rotating ring support is provided on the inner side of one end of the mechanical dynamic seal rotating ring facing the mechanical dynamic seal stationary ring, and the mechanical dynamic seal rotating ring support is synchronously rotated with the mechanical dynamic seal rotating ring. A first annular groove is provided on one end of the mechanical dynamic seal stationary ring support, and a stationary ring alloy ring is provided in the first annular groove. A second annular groove is provided on one end of the mechanical dynamic seal rotating ring support, and a rotating ring alloy ring is provided in the second annular groove. The end face of the stationary ring alloy ring and the end face of the rotating ring alloy ring are in sealed rotatable contact. An expansion ring is fixedly provided on the inner side of the other end of the mechanical dynamic seal rotating ring, and a sealing top cover is fixedly provided at the other end of the mechanical dynamic seal rotating ring.

[0008] The beneficial effects of this invention are: ensuring the flatness and roughness of the contact surface between the stationary alloy ring and the rotating alloy ring, the contact surface being a metal sealing surface, the stationary alloy ring and the rotating alloy ring rotating relative to each other, achieving dynamic sealing through the oil film formed on the contact surface, improving the sealing effect, and being suitable for sealing under high temperature, high pressure and harsh working environments.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, a sealing gasket is provided between the stationary alloy ring and the bottom of the first annular groove, and a sealing gasket is provided between the moving alloy ring and the bottom of the second annular groove.

[0011] The beneficial effects of adopting the above-mentioned further solution are: the setting of the sealing gasket can realize the sealing connection between the stationary ring alloy ring and the first annular groove, and the sealing connection between the rotating ring alloy ring and the second annular groove. At the same time, it can provide support and elasticity for the stationary ring alloy ring and the rotating ring alloy ring, so as to improve the contact strength between the stationary ring alloy ring and the rotating ring alloy ring, and further improve the sealing effect between them.

[0012] Furthermore, the mechanical dynamic seal ring bracket and the mechanical dynamic seal ring are slidably disposed on the axis. A spring is provided between the end face of the mechanical dynamic seal ring bracket away from the mechanical dynamic seal stationary ring bracket and the mechanical dynamic seal ring. The spring applies pressure to the mechanical dynamic seal ring bracket so that the end face of the stationary ring alloy ring and the end face of the dynamic ring alloy ring abut against each other.

[0013] The beneficial effect of adopting the above-mentioned further solution is that the spring applies a force to the mechanical dynamic seal dynamic ring support, further ensuring the contact strength between the stationary ring alloy ring and the dynamic ring alloy ring, thereby further improving the sealing effect between the two.

[0014] Furthermore, the inner side of the mechanical dynamic seal ring is provided with an internal hexagonal groove, and the outer side of the end of the mechanical dynamic seal ring bracket is provided with a hexagonal head structure that matches the internal hexagonal groove, and the hexagonal head structure is located in the internal hexagonal groove.

[0015] The beneficial effect of adopting the above-mentioned further solution is that the hexagonal head structure is set in the internal hexagonal groove, which enables the mechanical dynamic seal ring and the mechanical dynamic seal ring bracket to rotate synchronously, while ensuring that the mechanical dynamic seal ring bracket can slide on the axis.

[0016] The present invention also provides a dynamic seal mounting structure for an electric motor to solve the above-mentioned technical problems, including an electric motor housing, an electric motor support frame, and the aforementioned mechanical dynamic seal structure. One end of the electric motor housing is fixedly connected to one end of the electric motor support frame. The mechanical dynamic seal stationary ring and the mechanical dynamic seal moving ring are both disposed inside the electric motor support frame. The mechanical dynamic seal stationary ring is fixedly connected to the inner wall of the electric motor support frame, and the mechanical dynamic seal moving ring is rotatably connected to the electric motor support frame. An electric motor is housed inside the electric motor housing. The central shaft of the electric motor extends into the electric motor support frame. The mechanical dynamic seal stationary ring bracket and the mechanical dynamic seal moving ring bracket are spaced apart and sleeved on the central shaft of the electric motor. The expansion ring is fixedly sleeved on the central shaft of the electric motor. The sealing top cover is sealed and sleeved on the central shaft of the electric motor.

[0017] The beneficial effects of adopting the above solution are: the motor dynamic seal is wrapped and protected by the motor support frame, and the mud flows over the outside of the motor support frame, and the mud flow does not affect the operation of the dynamic seal;

[0018] Furthermore, a sliding bearing assembly is fixedly installed inside the end of the motor support frame away from the motor housing, and the central shaft of the motor is fixedly connected to the inner ring of the sliding bearing assembly.

[0019] The beneficial effects of adopting the above-mentioned further solution are: on the one hand, the sliding bearing assembly can support the central shaft of the motor, and on the other hand, the mud can only enter the dynamic seal from the sliding bearing assembly, which has a filtering effect on impurities such as sand and gravel contained in the mud, thus ensuring the working environment of the dynamic seal.

[0020] Furthermore, an electric motor bearing support shaft is fixedly connected to the inner ring of the sliding bearing assembly, and one end of the electric motor bearing support shaft is coaxially and fixedly connected to the central shaft of the electric motor.

[0021] The beneficial effect of adopting the above-mentioned further solution is that the motor bearing support shaft is coaxially and fixedly connected with the motor central shaft, thereby supporting the motor central shaft.

[0022] Furthermore, the end face of the motor bearing support shaft presses against the end face of the sealing top cover.

[0023] The beneficial effect of adopting the above-mentioned further solution is that the end face of the motor bearing support shaft presses against the end face of the sealing top cover, thereby achieving pressure support on the end face of the sealing top cover.

[0024] Furthermore, a motor connector housing is fixedly connected to one end of the motor housing away from the motor support frame. A pressure compensation piston device is provided inside the motor connector housing. One end of the pressure compensation piston device is connected to the interior of the motor, and the other end of the pressure compensation piston device is connected to the exterior of the motor connector housing.

[0025] The beneficial effect of adopting the above-mentioned further scheme is that the pressure compensation piston device can achieve pressure compensation at the bottom of the well.

[0026] To address the aforementioned technical problems, this invention also provides a sealing test device for testing the sealing performance of the aforementioned mechanical dynamic seal structure. The device includes a tooling housing with external threads for detachably and fixedly connecting to the stationary ring of the mechanical dynamic seal. A tooling central shaft is rotatably mounted inside the tooling housing. A tooling plug is fixedly mounted on the inner side of the end of the tooling housing away from the stationary ring of the mechanical dynamic seal. A tooling screw plug is internally threaded onto the tooling plug. A tooling tightening pin is provided between the tooling screw plug and one end of the tooling central shaft. A tooling pull-out sleeve is sleeved on the end of the tooling housing connected to the stationary ring of the mechanical dynamic seal. One end of the tooling pull-out sleeve is threadedly connected to the tooling housing. A tooling fixing half-ring is located inside the other end of the tooling pull-out sleeve. A pulling external protrusion is provided on the outer wall of one end of the tooling fixing half-ring located inside the tooling pull-out sleeve. A pulling internal protrusion is provided on the inner wall of the end of the tooling pull-out sleeve connected to the tooling fixing half-ring.

[0027] The beneficial effects of adopting the above scheme are: to realize the test installation of the mechanical dynamic seal structure and to realize the test of the sealing effect of the mechanical dynamic seal structure. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0030] Figure 3This is a schematic diagram of the mechanical dynamic seal stationary ring and the mechanical dynamic seal stationary ring support in Embodiment 2 of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0032] Figure 5 This is a partial enlarged view of the connection between the tooling pull-out sleeve and the tooling fixing half-ring in Embodiment 3 of the present invention;

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 1. Motor electrical connector housing; 2. Pressure compensation piston assembly; 2001. Piston; 2002. Compensating spring; 2003. Piston limiting ring; 2004. Bracket; 3. Motor housing; 4. Motor support frame; 5. Mechanical dynamic seal stationary ring; 6. Mechanical dynamic seal stationary ring bracket; 7. Sealing gasket; 8. Stationary ring alloy ring; 9. Dynamic ring alloy ring; 10. Mechanical dynamic seal dynamic ring bracket; 11. Mechanical dynamic seal dynamic ring; 12. 13. Spring; 14. Expansion ring; 15. Locking screw; 16. Check valve; 17. Sealing top cover; 18. Motor central shaft; 19. Motor bearing support shaft; 20. Sliding bearing assembly; 21. Tooling pull sleeve; 22. Tooling fixing half ring; 23. Tooling tightening pin; 24. Tooling plug; 25. Tooling housing; 26. Tooling plug; 27. Tooling central shaft; 28. Pulling outer protrusion; 29. ​​Pulling inner protrusion. Detailed Implementation

[0035] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0036] Example 1

[0037] like Figure 1As shown, this embodiment discloses a mechanical dynamic seal structure, including a mechanical dynamic seal stationary ring 5 and a mechanical dynamic seal moving ring 11 arranged coaxially. A mechanical dynamic seal stationary ring support 6 is provided on the inner side of one end of the mechanical dynamic seal stationary ring 5 facing the mechanical dynamic seal moving ring 11, and the mechanical dynamic seal stationary ring support 6 is synchronously rotated with the mechanical dynamic seal stationary ring 5. A mechanical dynamic seal moving ring support 10 is provided on the inner side of one end of the mechanical dynamic seal moving ring 11 facing the mechanical dynamic seal stationary ring 5, and the mechanical dynamic seal moving ring support 10 is synchronously rotated with the mechanical dynamic seal moving ring 11. The mechanical dynamic seal stationary ring bracket 6 has a first annular groove at one end facing the mechanical dynamic seal dynamic ring bracket 10, and a stationary ring alloy ring 8 is provided in the first annular groove; the mechanical dynamic seal dynamic ring bracket 10 has a second annular groove at one end facing the mechanical dynamic seal stationary ring bracket 6, and a dynamic ring alloy ring 9 is provided in the second annular groove; the end face of the stationary ring alloy ring 8 and the end face of the dynamic ring alloy ring 9 are in sealed rotatable contact; an expansion ring 13 is fixedly provided on the inner side of the other end of the mechanical dynamic seal dynamic ring 11, and a sealing top cover 14 is fixedly provided at the other end of the mechanical dynamic seal dynamic ring 11.

[0038] In this embodiment, a sealing gasket 7 is provided between the stationary alloy ring 8 and the bottom of the first annular groove, and a sealing gasket 7 is provided between the moving alloy ring 9 and the bottom of the second annular groove. The sealing gasket 7 enables the stationary alloy ring 8 to be sealed to the first annular groove, and the moving alloy ring 9 to be sealed to the second annular groove. At the same time, it provides support and elasticity for the stationary alloy ring 8 and the moving alloy ring 9, thereby improving the contact strength between the stationary alloy ring 8 and the moving alloy ring 9 and further improving the sealing effect between them.

[0039] The mechanical dynamic seal rotating ring bracket 10 and the mechanical dynamic seal rotating ring 11 are slidably arranged on the axis. A spring 12 is provided between the end face of the mechanical dynamic seal rotating ring bracket 10 away from the mechanical dynamic seal stationary ring bracket 6 and the mechanical dynamic seal rotating ring 11. The spring 12 applies pressure to the mechanical dynamic seal rotating ring bracket 10 so that the end face of the stationary ring alloy ring 8 and the end face of the rotating ring alloy ring 9 abut. The spring 12 applies force to the mechanical dynamic seal rotating ring bracket 10 to further ensure the abutment strength of the stationary ring alloy ring 8 and the rotating ring alloy ring 9, thereby further improving the sealing effect between them.

[0040] In this embodiment, the inner side of the mechanical dynamic seal ring 11 is provided with an internal hexagonal groove, and the outer side of the end of the mechanical dynamic seal ring bracket 10 is provided with a hexagonal head structure that matches the internal hexagonal groove. The hexagonal head structure is located in the internal hexagonal groove, so that the mechanical dynamic seal ring 11 and the mechanical dynamic seal ring bracket 10 can rotate synchronously, while ensuring that the mechanical dynamic seal ring bracket 10 can slide on the axis.

[0041] In this embodiment, the mechanical dynamic seal ring bracket 10 and the mechanical dynamic seal ring 11 also adopt a hexagonal groove and hexagonal head fit together to prevent rotation.

[0042] Example 2

[0043] like Figure 2 , Figure 3 As shown, this embodiment discloses a dynamic seal mounting structure for an electric motor, including an electric motor housing 3, an electric motor support frame 4, and the aforementioned mechanical dynamic seal structure. One end of the electric motor housing 3 is fixedly connected to one end of the electric motor support frame 4. The mechanical dynamic seal stationary ring 5 and the mechanical dynamic seal moving ring 11 are both disposed on the inner side of the electric motor support frame 4. The mechanical dynamic seal stationary ring 5 is fixedly connected to the inner wall of the electric motor support frame 4, and the mechanical dynamic seal moving ring 11 is rotatably connected to the electric motor support frame 4. An electric motor is disposed inside the electric motor housing 3. The electric motor central shaft 15 of the electric motor extends into the electric motor support frame 4. The mechanical dynamic seal stationary ring bracket 6 and the mechanical dynamic seal moving ring bracket 10 are spaced apart and sleeved on the electric motor central shaft 15. The expansion ring 13 is fixedly sleeved on the electric motor central shaft 15. The sealing top cover 14 is sealed and sleeved on the electric motor central shaft 15.

[0044] In this embodiment, a sliding bearing sleeve 17 is fixedly installed inside the end of the motor support frame 4 away from the motor housing 3. The motor central shaft 15 is fixedly connected to the inner ring of the sliding bearing sleeve 17. The sliding bearing sleeve 17 can support the motor central shaft 15 on the one hand, and on the other hand, the mud can only enter the dynamic seal through the sliding bearing sleeve 17, which has a filtering effect on impurities such as sand and gravel contained in the mud, thus ensuring the working environment of the dynamic seal.

[0045] In this embodiment, a motor bearing support shaft 16 is fixedly connected to the inner ring of the sliding bearing assembly 17. One end of the motor bearing support shaft 16 is coaxially and fixedly connected to the central shaft 15 of the motor, and the end face of the motor bearing support shaft 16 presses against the end face of the sealing top cover 14. The coaxial and fixed connection between the motor bearing support shaft 16 and the central shaft 15 of the motor provides support for the central shaft 15 of the motor and simultaneously provides pressure support to the end face of the sealing top cover 14.

[0046] The motor housing 3 is fixedly connected to a motor connector housing 1 at one end away from the motor support frame 4. A pressure compensation piston device 2 is provided inside the motor connector housing 1. One end of the pressure compensation piston device 2 is connected to the inside of the motor, and the other end of the pressure compensation piston device 2 is connected to the outside of the motor connector housing 1. The pressure compensation piston device 2 can realize pressure compensation at the bottom of the well.

[0047] In this embodiment, the pressure compensation piston device 2 includes a piston 2001, a compensation spring 2002, a piston limiting ring 2003, and a bracket 2004. The bracket 2004 is fixedly installed inside the motor connector housing 1. The compensation spring 2002 is sleeved on the bracket 2004, with its lower end fixedly abutting against the piston 2001. The piston 2001 is sleeved on the bracket 2004. The upper side of the piston 2001 is in a hydraulic oil environment, and the lower side of the piston 2001, at the compensation spring 2002, communicates with the outside of the motor connector housing 1 through a small hole. During the oil injection process, as the internal oil pressure of the electric motor increases, the piston 2001 compresses the compensation spring 2002 under the action of the oil pressure, increasing the oil storage volume. At this time, the internal hydraulic environment of the electric motor is under slight positive pressure. After the tool reaches the bottom of the well, the bottom mud enters through the small hole in the outer shell of the electric plug of the electric motor. The bottom pressure is applied to the lower side of the piston 2001, pushing the piston 2001 to move upward, squeezing the hydraulic oil inside the electric motor, and increasing the internal hydraulic oil pressure. When the piston 2001 stops, the bottom mud pressure is the same as the internal hydraulic oil pressure of the electric motor, thus achieving bottom pressure compensation.

[0048] The motor has a hydraulic oil environment inside and a mud environment outside. The motor housing 3 is the stationary part, and the motor central shaft 15 is the rotating part. In order to better prevent mud from entering the motor, a dynamic sealing structure is designed in the stationary and rotating parts. This allows the motor central shaft 15 to rotate and output, while ensuring that external mud cannot enter the mud through the dynamic-static junction.

[0049] During installation, the mechanical dynamic seal dynamic ring 11 is compressed, causing the stationary ring alloy ring 8 to contact the dynamic ring alloy ring 9, and the compression force is provided by the spring 12.

[0050] After the mechanical dynamic seal ring 11 is squeezed into place, it is locked by the expansion ring 13. Under the action of the expansion ring 13 screw, both the inner and outer sleeves of the expansion ring 13 move. The outer sleeve of the expansion ring 13 moves outward and locks with the inner hole of the mechanical dynamic seal ring 11, while the inner sleeve of the expansion ring 13 moves inward and locks with the motor central shaft 15. This integrates the dynamic ring alloy ring 9, the mechanical dynamic seal ring bracket 2004, the mechanical dynamic seal ring 11, the spring 12, the expansion ring 13, the sealing top cover 14, and the motor central shaft 15, allowing them to rotate together with the motor central shaft 15.

[0051] The sealing top cover 14 is fixed to the tail end of the mechanical dynamic seal ring 11 and is connected to the mechanical dynamic seal ring 11 by screws. Both its inner and outer sides are provided with sealing O rings to achieve space sealing at the tail end of the motor.

[0052] The motor bearing support shaft 16 is connected to the motor central shaft 15 by a thread, and at the same time pushes against the dynamic seal ring to ensure the clamping force of the dynamic seal metal sealing surface.

[0053] Both the motor connector housing 1 and the motor housing have oil inlets. The oil inlet on the motor connector housing 1 completes the function of injecting and venting hydraulic oil inside the motor. The oil inlet on the motor housing is equipped with a one-way valve 3001, which can ensure that the hydraulic oil inside the motor reaches a certain pressure and is blocked by the one-way valve 3001.

[0054] Example 3

[0055] like Figure 4 , Figure 5 As shown, this embodiment discloses a sealing test device for testing the sealing performance of the aforementioned mechanical dynamic seal structure. The device includes a tooling housing 22, which has an external thread for detachably and fixedly connecting to the mechanical dynamic seal stationary ring 5. A tooling center shaft 24 is rotatably mounted inside the tooling housing 22. A tooling plug 23 is fixedly mounted on the inner side of the end of the tooling housing 22 away from the mechanical dynamic seal stationary ring 5. A tooling screw plug 21 is internally threaded onto the tooling plug 23. The tooling screw plug 21 and the tooling center shaft 24 are connected to the tooling center shaft 24. A tooling clamping pin 20 is provided between one end of the shaft 24; a tooling pull sleeve 18 is provided on one end of the tooling housing 22 that is connected to the mechanical dynamic seal stationary ring 5. One end of the tooling pull sleeve 18 is threadedly connected to the tooling housing 22. A tooling fixing half ring 19 is provided inside the other end of the tooling pull sleeve 18. A pulling outer protrusion 25 is provided on the outer wall of one end of the tooling fixing half ring 19 that is located inside the tooling pull sleeve 18. A pulling inner protrusion 26 is provided on the inner wall of one end of the tooling pull sleeve 18 that is connected to the tooling fixing half ring 19.

[0056] The test method using the above-mentioned sealing test device includes the following steps:

[0057] (1) Install the bearing and the tooling center shaft 24 inside the tooling housing 22, install the tooling plug 23 and tighten it, insert the tooling top pin 20 from the tooling plug 23, and install the tooling screw plug 21 to tighten the tooling center shaft 24.

[0058] (2) Install the sealing gasket 7 and the stationary ring alloy ring 8 onto the mechanical dynamic seal stationary ring bracket 6, and install the mechanical dynamic seal stationary ring bracket 6 into the mechanical dynamic seal stationary ring 5 to complete the installation of the dynamic seal stationary ring part.

[0059] (3) Install the mechanical dynamic seal stationary ring 5 onto the tooling housing 22 by means of thread, insert the installed dynamic seal dynamic ring part into the tooling central shaft 24, and push the dynamic seal dynamic ring part so that the stationary ring alloy ring 8 and the dynamic ring alloy ring 9 contact each other.

[0060] (4) Place the expansion ring 13 into the mechanical dynamic seal ring 11, install the tooling pull-out sleeve 18, push the tooling pull-out sleeve 18 to move towards the tooling housing 22, and after the tooling pull-out sleeve 18 is engaged, adjust the position of the tooling fixing half ring 19, and connect the tooling fixing half ring 19 to the mechanical dynamic seal ring 11 with screws. During the engagement of the tooling pull-out sleeve 18, the tooling fixing half ring 19 is driven to move upward, that is, the dynamic seal ring part is pushed upward.

[0061] (5) After being pulled to a certain position, the gap between the stationary ring 5 and the moving ring 11 of the mechanical dynamic seal is measured by observing the side of the tooling fixing half ring 19 to determine the final position;

[0062] (6) Push the expansion ring 13 to the innermost end of the mechanical dynamic seal ring 11, tighten the locking screw 1301, and lock the dynamic seal ring part with the tooling center shaft 24.

[0063] (7) Disassemble the tooling pull sleeve 18 and the tooling fixing half ring 19, and install the sealing top cover 14;

[0064] (8) Remove the tooling plug 21, take out the tooling top pin 20, and re-tighten the tooling plug 21;

[0065] (9) Inject oil and vent air through tool plug 23, inject oil and pressurize through oil port of tool housing 22, and drive the protruding end of tool center shaft 24 to rotate through external motor to test the sealing effect of dynamic seal;

[0066] (10) In particular, the contact surface between the tooling pull sleeve 18 and the tooling fixing half ring 19 is inclined, preferably 105° inclined, that is, the contact surface between the pull outer protrusion 25 and the pull inner protrusion 26 is 105° inclined. The friction between the tooling pull sleeve 18 and the tooling fixing half ring 19 is reduced during its rotation and tightening process, which is conducive to the smooth operation of the dynamic seal dynamic ring part.

[0067] In the description of this invention, it should be understood that the terms "center," "length," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "inner," "outer," "circumferential," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0068] In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mechanical dynamic sealing structure, characterized in that, The system includes a mechanical dynamic seal stationary ring (5) and a mechanical dynamic seal moving ring (11) arranged coaxially. A mechanical dynamic seal stationary ring bracket (6) is provided on the inner side of one end of the mechanical dynamic seal stationary ring (5) facing the mechanical dynamic seal moving ring (11). The mechanical dynamic seal stationary ring bracket (6) rotates synchronously with the mechanical dynamic seal stationary ring (5). A mechanical dynamic seal moving ring bracket (10) is provided on the inner side of one end of the mechanical dynamic seal moving ring (11) facing the mechanical dynamic seal stationary ring (5). The mechanical dynamic seal moving ring bracket (10) rotates synchronously with the mechanical dynamic seal moving ring (11). The mechanical dynamic seal stationary ring bracket (6) rotates synchronously with the mechanical dynamic seal moving ring (5). One end of the ring bracket (10) is provided with a first annular groove, and a stationary ring alloy ring (8) is provided in the first annular groove; the mechanical dynamic seal moving ring bracket (10) is provided with a second annular groove at one end facing the mechanical dynamic seal stationary ring bracket (6), and a moving ring alloy ring (9) is provided in the second annular groove; the end face of the stationary ring alloy ring (8) and the end face of the moving ring alloy ring (9) are sealed and rotated in contact; an expansion ring (13) is fixedly provided on the inner side of the other end of the mechanical dynamic seal moving ring (11), and the expansion ring (13) is used to be fixedly sleeved on the central shaft (15) of the motor; a sealing top cover (14) is sealed and fixedly provided at the other end of the mechanical dynamic seal moving ring (11).

2. The mechanical dynamic sealing structure according to claim 1, characterized in that, A sealing gasket (7) is provided between the stationary ring alloy ring (8) and the bottom of the first annular groove, and a sealing gasket (7) is provided between the moving ring alloy ring (9) and the bottom of the second annular groove.

3. The mechanical dynamic sealing structure according to claim 1, characterized in that, The mechanical dynamic seal ring bracket (10) and the mechanical dynamic seal ring (11) are slidably arranged on the axis. A spring (12) is provided between the end face of the mechanical dynamic seal ring bracket (10) away from the mechanical dynamic seal stationary ring bracket (6) and the mechanical dynamic seal ring (11). The spring (12) applies pressure to the mechanical dynamic seal ring bracket (10) so that the end face of the stationary ring alloy ring (8) and the end face of the dynamic ring alloy ring (9) abut against each other.

4. The mechanical dynamic sealing structure according to claim 3, characterized in that, The inner side of the mechanical dynamic seal ring (11) is provided with an internal hexagonal groove, and the outer side of the end of the mechanical dynamic seal ring bracket (10) is provided with a hexagonal head structure that matches the internal hexagonal groove. The hexagonal head structure is located in the internal hexagonal groove.

5. A dynamic seal mounting structure for an electric motor, characterized in that, The device includes a motor housing (3), a motor support frame (4), and a mechanical dynamic seal structure as described in any one of claims 1 to 4. One end of the motor housing (3) is fixedly connected to one end of the motor support frame (4). The mechanical dynamic seal stationary ring (5) and the mechanical dynamic seal moving ring (11) are both located inside the motor support frame (4). The mechanical dynamic seal stationary ring (5) is fixedly connected to the inner wall of the motor support frame (4), and the mechanical dynamic seal moving ring (11) is rotatably connected to the motor support frame (4). The motor housing (3) contains a motor. The motor central shaft (15) of the motor extends into the motor support frame (4). The mechanical dynamic seal stationary ring bracket (6) and the mechanical dynamic seal moving ring bracket (10) are spaced apart and sleeved on the motor central shaft (15). The expansion ring (13) is fixedly sleeved on the motor central shaft (15). The sealing top cover (14) is sealed and sleeved on the motor central shaft (15).

6. The dynamic seal mounting structure for an electric motor according to claim 5, characterized in that, The motor support frame (4) is fixedly provided with a sliding bearing assembly (17) at one end away from the motor housing (3), and the motor central shaft (15) is fixedly connected to the inner ring of the sliding bearing assembly (17).

7. The dynamic seal mounting structure for an electric motor according to claim 6, characterized in that, The inner ring of the sliding bearing assembly (17) is fixedly connected to a motor bearing support shaft (16), and one end of the motor bearing support shaft (16) is coaxially fixedly connected to the central shaft (15) of the motor.

8. The dynamic seal mounting structure for an electric motor according to claim 7, characterized in that, The end face of the motor bearing support shaft (16) presses against the end face of the sealing top cover (14).

9. The dynamic seal mounting structure for an electric motor according to claim 5, characterized in that, The motor housing (3) is fixedly connected to a motor connector housing (1) at one end away from the motor support frame (4). A pressure compensation piston device (2) is provided inside the motor connector housing (1). One end of the pressure compensation piston device (2) is connected to the inside of the motor, and the other end of the pressure compensation piston device (2) is connected to the outside of the motor connector housing (1).

10. A sealing test apparatus for testing the sealing performance of the mechanical dynamic sealing structure according to any one of claims 1 to 4, characterized in that, The fixture includes a fixture housing (22), which has an external thread for detachable and fixed connection with the mechanical dynamic seal stationary ring (5). A fixture center shaft (24) is rotatably mounted inside the fixture housing (22). A fixture plug (23) is fixedly mounted on the inner side of the end of the fixture housing (22) away from the mechanical dynamic seal stationary ring (5). A fixture plug (21) is threaded into the fixture plug (23). A fixture clamping pin (20) is provided between the fixture plug (21) and one end of the fixture center shaft (24). The tooling housing (22) is fitted with a tooling pull sleeve (18) at one end of the mechanical dynamic seal stationary ring (5). One end of the tooling pull sleeve (18) is threaded to the tooling housing (22). The other end of the tooling pull sleeve (18) is fitted with a tooling fixing half ring (19). The outer wall of the tooling fixing half ring (19) located inside the tooling pull sleeve (18) is fitted with a pull-out outer protrusion (25). The inner wall of the end of the tooling pull sleeve (18) connected to the tooling fixing half ring (19) is fitted with a pull-out inner protrusion (26).

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