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

Abstract

The invention relates to the technical field of oil and gas drilling, in particular to a mechanical dynamic seal structure, a motor dynamic seal mounting structure and a seal testing device.The mechanical dynamic seal structure comprises a mechanical dynamic seal static ring and a mechanical dynamic seal dynamic ring which are coaxially arranged, and a mechanical dynamic seal static ring support is arranged on the inner side of the mechanical dynamic seal static ring; a mechanical dynamic sealing movable ring bracket is arranged on the inner side of the mechanical dynamic sealing movable ring; a first annular groove is formed in one end of the mechanical dynamic sealing static ring support, and a static ring alloy ring is arranged in the first annular groove. A second annular groove is formed in one end of the mechanical dynamic sealing movable ring support, and a movable ring alloy ring is arranged in the second annular groove. The static ring alloy ring and the moving ring alloy ring are hermetically and rotatably abutted against each other; an expansion ring is fixedly arranged on the inner side of the other end of the mechanical dynamic sealing movable ring, and a sealing top cover is fixedly arranged at the other end of the mechanical dynamic sealing movable ring in a sealing mode. The static ring alloy ring and the movable ring alloy ring rotate mutually, movable sealing is achieved through the oil film, the sealing effect is improved, and the sealing ring can be suitable for sealing in the high-temperature and high-pressure severe working environment.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas drilling, and in particular to a mechanical dynamic seal structure, an electric dynamic seal installation structure and a seal testing device. Background Art

[0002] With the development of the oil industry, oil extraction has gradually expanded from shallow to deep layers, which has put forward new requirements for oil extraction technology. In the process of deep oil extraction, due to the location of reservoirs and the need for unconventional oil and gas drilling, more complex drilling technology is required. Rotary steerable drilling technology is a cutting-edge automated drilling technology developed in the late 20th century. It is mainly used for steer drilling of special process wells such as horizontal wells, ultra-deep wells, large-reach wells, and high-difficulty directional wells. It can automatically and flexibly adjust the well inclination and azimuth, has high control accuracy, strong drilling ability, and realizes the automation of drilling. It represents the highest level of drilling technology development in the world today.

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

[0004] At present, the research on dynamic seal structure and lubrication performance in common downhole high temperature and high pressure environment is mainly focused on three aspects: bearing seal of cone head, lower end seal of guide tool and non-down power drilling tool seal, while the structural performance of seal mainly adopts rubber seal.

[0005] Rubber sealing refers to the use of rubber parts to seal the relative rotating space while ensuring the continuity of rotation. The biggest problem with rubber sealing is the temperature resistance and wear resistance of rubber and the volume change with temperature. As a non-metallic material, the volume and compressibility of rubber change greatly with temperature. When the dynamic sealing mechanism moves, the rubber, as a sealing medium, contacts the metal part and is compressed to achieve the sealing function, which will generate a large friction force, which will be converted into heat. As the temperature rises, the volume of rubber expands, causing the friction resistance to increase. High friction will generate more heat, which will eventually lead to the wear of rubber parts and the failure of the sealing function. 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 dynamic seal installation structure and a seal testing device, which adopts a mechanical seal method to form a seal through a smooth metal surface, and at the same time greatly reduces the friction resistance through the coverage of the oil film, thereby increasing the service life of the dynamic seal.

[0007] The technical solution of the present invention to solve the above technical problems is as follows: a mechanical dynamic seal structure, comprising a mechanical dynamic seal static ring and a mechanical dynamic seal dynamic ring arranged coaxially, wherein a mechanical dynamic seal static ring bracket is provided on the inner side of one end of the mechanical dynamic seal static ring facing the mechanical dynamic seal dynamic ring, and the mechanical dynamic seal static ring bracket is arranged to rotate synchronously with the mechanical dynamic seal static ring; a mechanical dynamic seal dynamic ring bracket is provided on the inner side of one end of the mechanical dynamic seal dynamic ring facing the mechanical dynamic seal static ring, and the mechanical dynamic seal dynamic ring bracket is arranged to rotate synchronously with the mechanical dynamic seal dynamic ring; a first annular groove is provided on the end of the mechanical dynamic seal static ring bracket facing the mechanical dynamic seal dynamic ring bracket, and a static ring alloy ring is arranged in the first annular groove; a second annular groove is provided on the end of the mechanical dynamic seal dynamic ring bracket facing the mechanical dynamic seal static ring bracket, and a dynamic ring alloy ring is arranged in the second annular groove; the end face of the static ring alloy ring is in sealing and rotating contact with the end face of the dynamic ring alloy ring; an expansion ring is fixedly provided on the inner side of the other end of the mechanical dynamic seal dynamic ring, and a sealing top cover is sealed and fixedly provided on the other end of the mechanical dynamic seal dynamic ring.

[0008] The beneficial effects of the present invention are: ensuring the flatness and roughness of the contact surface between the static ring alloy ring and the dynamic ring alloy ring, the contact surface is a metal sealing surface, the static ring alloy ring and the dynamic ring alloy ring rotate with each other, and dynamic sealing is achieved through the oil film formed on the contact surface, thereby improving the sealing effect, and can be suitable for sealing under high temperature, high pressure and harsh working environments.

[0009] Based on the above technical solution, the present invention can also be 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 dynamic alloy ring and the bottom of the second annular groove.

[0011] The beneficial effect of adopting the above-mentioned further scheme is that the setting of the sealing gasket can realize the sealed connection between the static ring alloy ring and the first annular groove, and the sealed connection between the dynamic ring alloy ring and the second annular groove, and at the same time can provide support and elastic force for the static ring alloy ring and the dynamic ring alloy ring, so as to improve the abutment strength between the static ring alloy ring and the dynamic ring alloy ring, and further improve the sealing effect between the two.

[0012] Furthermore, the mechanical dynamic seal dynamic ring bracket and the mechanical dynamic seal dynamic ring are slidably arranged on the axis, and a spring is provided between the end face of the mechanical dynamic seal dynamic ring bracket away from the mechanical dynamic seal static ring bracket and the mechanical dynamic seal dynamic ring, and the spring applies pressure to the mechanical dynamic seal dynamic ring bracket so that the end face of the static 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 further solution is that the spring applies force to the dynamic ring bracket of the mechanical dynamic seal, further ensuring the abutment strength between the static ring alloy ring and the dynamic ring alloy ring, thereby further improving the sealing effect between the two.

[0014] Furthermore, a hexagonal inner groove is provided on the inner side of the mechanical dynamic seal dynamic ring, a hexagonal head structure matching the hexagonal inner groove is provided on the outer side of the end of the mechanical dynamic seal dynamic ring bracket, and the hexagonal head structure is arranged in the hexagonal inner groove.

[0015] The beneficial effect of adopting the above further solution is that the hexagonal head structure is arranged in the inner hexagonal groove, so that the mechanical dynamic seal dynamic ring and the mechanical dynamic seal dynamic ring bracket can rotate synchronously, while ensuring that the mechanical dynamic seal dynamic ring bracket can slide on the axis.

[0016] The present invention solves the above technical problems and also provides an electric motor dynamic seal installation structure, comprising a motor housing, a motor support frame and the above-mentioned mechanical dynamic seal structure, one end of the motor housing is fixedly connected to one end of the motor support frame, the mechanical dynamic seal static ring and the mechanical dynamic seal dynamic ring are both arranged on the inner side of the motor support frame, the mechanical dynamic seal static ring is fixedly connected to the inner wall of the motor support frame, and the mechanical dynamic seal dynamic ring is rotatably connected to the motor support frame; a motor is arranged in the motor housing, the motor center axis of the motor extends into the motor support frame, the mechanical dynamic seal static ring bracket and the mechanical dynamic seal dynamic ring bracket are both spaced and sleeved on the motor center axis, the expansion ring is fixedly sleeved on the motor center axis; the sealing top cover sealing sleeve is arranged on the motor center axis.

[0017] The beneficial effects of adopting the above scheme are: the motor dynamic seal part is wrapped and protected by the motor support frame, the mud flows through the outside of the motor support frame, and the mud flow does not affect the running state of the dynamic seal;

[0018] Furthermore, a sliding bearing set is fixedly provided inside one 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 set.

[0019] The beneficial effect of adopting the above further scheme is that the sliding bearing set can support the central shaft of the motor on the one hand, and on the other hand, the mud can only enter the dynamic seal from the sliding bearing set, which has a filtering effect on impurities such as gravel contained in the mud, thereby ensuring the working environment of the dynamic seal.

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

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

[0022] Furthermore, the end surface of the motor bearing support shaft is pressed against the end surface of the sealing top cover.

[0023] The beneficial effect of adopting the above further solution is that the end surface of the motor bearing support shaft presses against the end surface of the sealing top cover, thereby achieving pressing and supporting the end surface of the sealing top cover.

[0024] Furthermore, one end of the motor housing away from the motor support frame is fixedly connected to a motor electrical connector housing, and a pressure compensating piston device is provided in the motor electrical connector housing. One end of the pressure compensating piston device is connected to the interior of the motor, and the other end of the pressure compensating piston device is connected to the outside of the motor electrical connector housing.

[0025] The beneficial effect of adopting the above further solution is that the arrangement of the pressure compensation piston device can achieve compensation for the bottom hole pressure.

[0026] The present invention solves the above technical problems and also provides a sealing test device for testing the sealing performance of the above-mentioned mechanical dynamic seal structure, comprising a tooling shell, the tooling shell is provided with an external thread for detachably fixedly connected with the thread of the mechanical dynamic seal static ring, a tooling center axis is rotatably arranged in the tooling shell, a tooling plug is fixedly arranged on the inner side of one end of the tooling shell away from the mechanical dynamic seal static ring, the tooling plug is internally threadedly connected with a tooling plug, a tooling tightening pin is arranged between the tooling plug and one end of the tooling center axis; a tooling drawing sleeve is arranged on the outer sleeve of one end of the tooling shell connected to the mechanical dynamic seal static ring, one end of the tooling drawing sleeve is threadedly connected to the tooling shell, a tooling fixing half ring is arranged in the other end of the tooling drawing sleeve, a drawing outer protrusion is arranged on the outer wall of one end of the tooling fixing half ring arranged in the tooling drawing sleeve, and a drawing inner protrusion is arranged on the inner wall of one end of the tooling drawing sleeve connected to the tooling fixing half ring.

[0027] The beneficial effects of adopting the above solution are: achieving the test installation of the mechanical dynamic sealing structure and achieving the test of the sealing effect of the mechanical dynamic sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[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 3It is a schematic structural diagram of a mechanical dynamic seal static ring and a mechanical dynamic seal static ring bracket in the second embodiment 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 It is a partial enlarged view of the connection between the tool drawing sleeve and the tool fixing half ring in the third embodiment of the present invention;

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 1. Motor electrical connector housing; 2. Pressure compensation piston device; 2001. Piston; 2002. Compensation spring; 2003. Piston stop ring; 2004. Bracket; 3. Motor housing; 4. Motor support frame; 5. Mechanical dynamic seal and static ring; 6. Mechanical dynamic seal and static ring bracket; 7. Sealing pad; 8. Static ring alloy ring; 9. Dynamic ring alloy ring; 10. Mechanical dynamic seal dynamic ring bracket; 11. Mechanical dynamic seal dynamic ring; 12. Spring; 13. Expansion ring; 1301. Locking screw; 3001. Check valve; 14. Sealing top cover; 15. Motor center shaft; 16. Motor bearing support shaft; 17. Sliding bearing set; 18. Tooling drawing sleeve; 19. Tooling fixing half ring; 20. Tooling tightening pin; 21. Tooling screw plug; 22. Tooling housing; 23. Tooling plug; 24. Tooling center shaft; 25. Pull out outer protrusion; 26. Pull out inner protrusion. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] Embodiment 1

[0037] like Figure 1As shown, this embodiment discloses a mechanical dynamic seal structure, including a mechanical dynamic seal static ring 5 and a mechanical dynamic seal moving ring 11 arranged coaxially, a mechanical dynamic seal static ring bracket 6 is arranged on the inner side of one end of the mechanical dynamic seal static ring 5 facing the mechanical dynamic seal moving ring 11, and the mechanical dynamic seal static ring bracket 6 is arranged to rotate synchronously with the mechanical dynamic seal static ring 5; a mechanical dynamic seal moving ring bracket 10 is arranged on the inner side of one end of the mechanical dynamic seal moving ring 11 facing the mechanical dynamic seal static ring 5, and the mechanical dynamic seal moving ring bracket 10 is arranged to rotate synchronously with the mechanical dynamic seal moving ring 11; A first annular groove is provided at one end of the mechanical dynamic seal stationary ring support 6 facing the mechanical dynamic seal dynamic ring support 10, and a stationary ring alloy ring 8 is provided in the first annular groove; a second annular groove is provided at one end of the mechanical dynamic seal dynamic ring support 10 facing the mechanical dynamic seal stationary ring support 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 sealingly rotatably abutted; 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 sealed and fixedly provided on the other end of the mechanical dynamic seal dynamic ring 11.

[0038] In this embodiment, 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 dynamic ring alloy ring 9 and the bottom of the second annular groove. The setting of the sealing gasket 7 can realize the sealed connection between the stationary ring alloy ring 8 and the first annular groove, and the sealed connection between the dynamic ring alloy ring 9 and the second annular groove, and at the same time can provide support and elastic force for the stationary ring alloy ring 8 and the dynamic ring alloy ring 9, so as to improve the abutment strength between the stationary ring alloy ring 8 and the dynamic ring alloy ring 9, and further improve the sealing effect between the two.

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

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

[0041] In this embodiment, the mechanical dynamic seal dynamic ring bracket 10 and the mechanical dynamic seal dynamic ring 11 are also matched with hexagonal slots and hexagonal heads to prevent rotation.

[0042] Embodiment 2

[0043] like Figure 2 , Figure 3 As shown, this embodiment discloses an electric motor dynamic seal installation structure, including a motor housing 3, a motor support frame 4 and the above-mentioned mechanical dynamic seal structure, one end of the motor housing 3 is fixedly connected to one end of the motor support frame 4, the mechanical dynamic seal static ring 5 and the mechanical dynamic seal dynamic ring 11 are both arranged on the inner side of the motor support frame 4, the mechanical dynamic seal static ring 5 is fixedly connected to the inner wall of the motor support frame 4, and the mechanical dynamic seal dynamic ring 11 is rotatably connected to the motor support frame 4; a motor is arranged in the motor housing 3, and the motor center axis 15 of the motor extends into the motor support frame 4, the mechanical dynamic seal static ring bracket 6 and the mechanical dynamic seal dynamic ring bracket 10 are both spaced and sleeved on the motor center axis 15, and the expansion ring 13 is fixedly sleeved on the motor center axis 15; the sealing top cover 14 is sealingly sleeved on the motor center axis 15.

[0044] In this embodiment, a sliding bearing sleeve 17 is fixedly provided inside the end of the motor support frame 4 away from the motor housing 3, and the motor center shaft 15 is fixedly connected to the inner ring of the sliding bearing sleeve 17. On the one hand, the sliding bearing sleeve 17 can support the motor center shaft 15, and on the other hand, mud can only enter the dynamic seal from the sliding bearing sleeve 17, which has a filtering effect on impurities such as gravel contained in the mud, thereby 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 set 17, one end of the motor bearing support shaft 16 is coaxially fixedly connected to the motor center shaft 15, and the end surface of the motor bearing support shaft 16 presses against the end surface of the sealing top cover 14. The motor bearing support shaft 16 is coaxially fixedly connected to the motor center shaft 15 to support the motor center shaft 15 and to press and support the end surface of the sealing top cover 14.

[0046] One end of the motor housing 3 away from the motor support frame 4 is fixedly connected to the motor electrical connector housing 1, and a pressure compensation piston device 2 is provided in the motor electrical connector housing 1. One end of the pressure compensation piston device 2 is connected to the interior of the motor, and the other end of the pressure compensation piston device 2 is connected to the outside of the motor electrical connector housing 1. The setting of the pressure compensation piston device 2 can realize bottom hole pressure compensation.

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

[0048] The interior of the motor is a hydraulic oil environment, and the exterior is a mud environment. The motor housing 3 is the stationary part, and the motor center shaft 15 is the rotating part. In order to better prevent mud from invading the interior of the motor, a dynamic sealing structure is designed in the stationary and rotating parts, which can realize the rotation output of the motor center shaft 15 and ensure that external mud cannot enter the mud through the static and dynamic joint.

[0049] During the installation process, the dynamic ring 11 of the mechanical dynamic seal is compressed, so that the contact surfaces of the static ring alloy ring 8 and the dynamic ring alloy ring 9 are in contact and the extrusion force is provided by compression of the spring 12.

[0050] After the mechanical dynamic seal dynamic ring 11 is squeezed into place, it is locked by the expansion ring 13. Under the action of the expansion ring 13 screw, the inner and outer sleeves of the expansion ring 13 move. The outer sleeve of the expansion ring 13 moves outward and is locked with the inner hole of the mechanical dynamic seal dynamic ring 11, and the inner sleeve of the expansion ring 13 moves inward and is locked with the motor center axis 15, so that the dynamic ring alloy ring 9, the mechanical dynamic seal dynamic ring bracket 2004, the mechanical dynamic seal dynamic ring 11, the spring 12, the expansion ring 13, the sealing top cover 14 and the motor center axis 15 are integrated and rotated together with the motor center axis 15.

[0051] The sealing top cover 14 is fixed to the tail end of the mechanical dynamic sealing ring 11 and connected to the mechanical dynamic sealing ring 11 by screws. Sealing O-rings are provided on both the inner and outer sides to achieve sealing of the tail end space of the motor.

[0052] The motor bearing support shaft 16 is connected to the motor center shaft 15 by means of threads, and at the same time pushes against the dynamic seal dynamic ring part to ensure the pressing force of the dynamic seal metal sealing surface.

[0053] There are oil filling ports on the motor electrical connector housing 1 and the motor housing. The oil filling port on the motor electrical connector housing 1 completes the injection and exhaust functions of the hydraulic oil inside the motor. The oil filling port on the motor housing is installed with a one-way valve 3001, which can ensure that the hydraulic oil inside the motor is blocked by the one-way valve 3001 after reaching a certain pressure.

[0054] Embodiment 3

[0055] like Figure 4 , Figure 5 As shown, this embodiment discloses a sealing test device for testing the sealing performance of the mechanical dynamic seal structure described above, including a tool housing 22, the tool housing 22 is provided with an external thread for being detachably fixedly connected with the mechanical dynamic seal static ring 5, a tool center shaft 24 is rotatably provided in the tool housing 22, a tool plug 23 is fixedly provided on the inner side of one end of the tool housing 22 away from the mechanical dynamic seal static ring 5, the tool plug 23 is internally threadedly connected with a tool screw plug 21, and the tool screw plug 21 is connected to the tool center A tooling tightening pin 20 is provided between one end of the shaft 24; a tooling drawing sleeve 18 is provided on the outer sleeve of one end of the tooling housing 22 connected to the mechanical dynamic seal static ring 5, one end of the tooling drawing sleeve 18 is threadedly connected to the tooling housing 22, and a tooling fixing half ring 19 is provided inside the other end of the tooling drawing sleeve 18, and a drawing outer protrusion 25 is provided on the outer wall of one end of the tooling fixing half ring 19 arranged in the tooling drawing sleeve 18, and a drawing inner protrusion 26 is provided on the inner wall of one end of the tooling drawing sleeve 18 connected to the tooling fixing half ring 19.

[0056] The testing method using the above sealing testing device comprises 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 locking pin 20 from the inside of 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 static ring alloy ring 8 onto the mechanical dynamic seal static ring bracket 6, and install the mechanical dynamic seal static ring bracket 6 onto the mechanical dynamic seal static ring 5 to complete the installation of the dynamic seal static ring part;

[0059] (3) Install the mechanical dynamic seal static ring 5 onto the tooling housing 22 by threading, insert the installed dynamic seal dynamic ring part onto the tooling center shaft 24, and push the dynamic seal dynamic ring part to make the static ring alloy ring 8 contact the dynamic ring alloy ring 9 contact surface;

[0060] (4) Place the expansion ring 13 into the dynamic ring 11 of the mechanical dynamic seal, install the tooling drawing sleeve 18, push the tooling drawing sleeve 18 to move toward the tooling housing 22, and after the tooling drawing sleeve 18 is buckled, adjust the position of the tooling fixed half ring 19, and connect the tooling fixed half ring 19 to the dynamic ring 11 of the mechanical dynamic seal by screws. During the buckling process of the tooling drawing sleeve 18, the tooling fixed half ring 19 is driven to move upward, that is, the dynamic seal dynamic ring part is pushed upward;

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

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

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

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

[0065] (9) Fill oil through the tool plug 23 to exhaust, fill oil through the tool housing 22 to pressurize, and drive the extended end of the tool center shaft 24 to rotate through an external motor to test the sealing effect of the dynamic seal;

[0066] (10) In particular, the contact connection surface between the tooling drawing sleeve 18 and the tooling fixed half ring 19 adopts an inclined contact, preferably a 105° inclined contact, that is, the contact connection surface between the drawing outer protrusion 25 and the drawing inner protrusion 26 adopts a 105° inclined contact. The friction between the tooling drawing sleeve 18 and the tooling fixed half ring 19 is reduced during its rotation and buckling process, which is beneficial to the smooth operation of the dynamic seal dynamic ring part.

[0067] In the description of the present invention, it is necessary to understand that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred system or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0068] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0069] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mechanical dynamic sealing structure, characterized in that: The invention comprises a mechanical dynamic seal static ring (5) and a mechanical dynamic seal moving ring (11) which are coaxially arranged, wherein a mechanical dynamic seal static ring support (6) is arranged on the inner side of one end of the mechanical dynamic seal static ring (5) facing the mechanical dynamic seal moving ring (11), and the mechanical dynamic seal static ring support (6) is arranged to rotate synchronously with the mechanical dynamic seal static ring (5); a mechanical dynamic seal moving ring support (10) is arranged on the inner side of one end of the mechanical dynamic seal moving ring (11) facing the mechanical dynamic seal static ring (5), and the mechanical dynamic seal moving ring support (10) is arranged to rotate synchronously with the mechanical dynamic seal moving ring (11); the mechanical dynamic seal static ring support (6) A first annular groove is provided toward one end of the mechanical dynamic seal dynamic ring support (10), and a stationary ring alloy ring (8) is provided in the first annular groove; a second annular groove is provided toward one end of the mechanical dynamic seal dynamic ring support (10) and a stationary 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 sealing and 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 sealed and fixedly provided on the other end of the mechanical dynamic seal dynamic ring (11).

2. A mechanical dynamic seal structure according to claim 1, characterized in that: 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 dynamic alloy ring (9) and the bottom of the second annular groove.

3. A mechanical dynamic seal structure according to claim 1, characterized in that: The mechanical dynamic seal dynamic ring support (10) and the mechanical dynamic seal dynamic ring (11) are slidably arranged on an axis, and a spring (12) is arranged between an end face of the mechanical dynamic seal dynamic ring support (10) away from the mechanical dynamic seal static ring support (6) and the mechanical dynamic seal dynamic ring (11), and the spring (12) applies pressure to the mechanical dynamic seal dynamic ring support (10) so that the end face of the static ring alloy ring (8) and the end face of the dynamic ring alloy ring (9) are in contact with each other.

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

5. An electric dynamic seal installation structure, characterized in that: The invention comprises a motor housing (3), a motor support frame (4) and a mechanical dynamic seal structure as claimed in any one of claims 1 to 4, wherein one end of the motor housing (3) is fixedly connected to one end of the motor support frame (4), the mechanical dynamic seal static ring (5) and the mechanical dynamic seal dynamic ring (11) are both arranged on the inner side of the motor support frame (4), the mechanical dynamic seal static ring (5) is fixedly connected to the inner wall of the motor support frame (4), and the mechanical dynamic seal dynamic ring (11) is rotatably connected to the motor support frame (4); a motor is arranged in the motor housing (3), and the motor center axis (15) of the motor extends into the motor support frame (4); the mechanical dynamic seal static ring bracket (6) and the mechanical dynamic seal dynamic ring bracket (10) are both sleeved on the motor center axis (15) at intervals, and the expansion ring (13) is fixedly sleeved on the motor center axis (15); and the sealing top cover (14) is sealingly sleeved on the motor center axis (15).

6. The electric dynamic seal installation structure according to claim 5, characterized in that: A sliding bearing sleeve (17) is fixedly provided inside the end of the motor support frame (4) away from the motor housing (3), and the motor center shaft (15) is fixedly connected to the inner ring of the sliding bearing sleeve (17).

7. The electric dynamic seal installation structure according to claim 6, characterized in that: A motor bearing support shaft (16) is fixedly connected inside the inner ring of the sliding bearing set (17), and one end of the motor bearing support shaft (16) is coaxially fixedly connected to the motor center shaft (15).

8. The electric dynamic seal installation structure according to claim 7, characterized in that: The end surface of the motor bearing support shaft (16) is pressed against the end surface of the sealing top cover (14).

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

10. A sealing test device for testing the sealing performance of the mechanical dynamic sealing structure according to any one of claims 1 to 4, characterized in that: The tool housing (22) comprises an external thread for being detachably fixedly connected with the mechanical dynamic seal static ring (5) through a thread, a tool center shaft (24) is rotatably arranged in the tool housing (22), a tool plug (23) is fixedly arranged on the inner side of one end of the tool housing (22) away from the mechanical dynamic seal static ring (5), a tool plug (21) is connected to the inner thread of the tool plug (23), and a tool tightening pin (20) is arranged between the tool plug (21) and one end of the tool center shaft (24); The tool housing (22) is provided with a tool drawing sleeve (18) on one end thereof connected to the mechanical dynamic seal static ring (5); one end of the tool drawing sleeve (18) is threadedly connected to the tool housing (22); the other end of the tool drawing sleeve (18) is provided with a tool fixing half ring (19); the tool fixing half ring (19) is provided with a drawing outer protrusion (25) on the outer wall of one end thereof arranged in the tool drawing sleeve (18); and the end of the tool drawing sleeve (18) connected to the tool fixing half ring (19) is provided with a drawing inner protrusion (26) on the inner wall thereof.

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