CN223634887U - A mechanical seal for a crude oil lifting twin-screw pump - Google Patents
A mechanical seal for a crude oil lifting twin-screw pumpInfo
- Publication number
- CN223634887U CN223634887U CN202423157615.3U CN202423157615U CN223634887U CN 223634887 U CN223634887 U CN 223634887U CN 202423157615 U CN202423157615 U CN 202423157615U CN 223634887 U CN223634887 U CN 223634887U
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- seat
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Abstract
本实用新型提供一种用于原油升举双螺杆泵的机械密封，包括轴套和密封座，密封座内腔的一端设有第一安装槽，轴套仅第一安装槽一端的外部设有安装凸台，安装凸台的一端与第一安装槽之间配装有一级密封单元；密封座的另一端连接有法兰座，法兰座与密封座之间形成第二安装槽，安装凸台的另一端与第二安装槽之间配装有二级密封单元，密封座的侧壁上设有进液口以及出液口，且密封腔压力高于介质端压力；轴套远离安装凸台一端的外部连接有驱动环，驱动环的侧壁上穿设有多个与转轴抵接的紧定螺钉，且驱动环的外周壁上还可拆卸的连接有多个与密封座卡接的限位块。该用于原油升举双螺杆泵的机械密封，密封性能稳定，使用寿命长，且安装方便。
This invention provides a mechanical seal for a twin-screw pump used for crude oil lifting, comprising a shaft sleeve and a sealing seat. One end of the sealing seat's inner cavity has a first mounting groove. The shaft sleeve has a mounting boss only on the outer side of one end of the first mounting groove. A primary sealing unit is fitted between one end of the mounting boss and the first mounting groove. The other end of the sealing seat is connected to a flange seat, forming a second mounting groove between the flange seat and the sealing seat. A secondary sealing unit is fitted between the other end of the mounting boss and the second mounting groove. The side wall of the sealing seat has an inlet and an outlet, and the pressure in the sealing cavity is higher than the pressure at the medium end. A drive ring is connected to the outer side of the shaft sleeve away from the mounting boss. Multiple set screws abut against the rotating shaft are threaded through the side wall of the drive ring, and multiple limiting blocks that engage with the sealing seat are detachably connected to the outer peripheral wall of the drive ring. This mechanical seal for a twin-screw pump used for crude oil lifting has stable sealing performance, long service life, and is easy to install.
Description
Technical Field
The utility model relates to the technical field of mechanical sealing, in particular to a mechanical sealing for a crude oil lifting double-screw pump.
Background
At present, a screw pump lifting mode is adopted for oil extraction in many oil fields. The lifting screw pump oil extraction is suitable for the exploitation occasions of sand, gas and thick oil, has the advantages of electricity saving, simple structure, high efficiency, low running cost, small occupied area and the like, and can be almost used for oil wells with well depths not exceeding 1500 meters, so that the screw pump oil extraction device has been actively popularized and widely applied in various large oil fields.
Crude oil is generally in saline-alkali soil, so crude oil coming out of the ground contains sand and stones, the saline-alkali soil contains various carbonates, chloride salts and sulfates, contains hydrogen sulfide, 10-15% of water, and also air (the medium can be converted under 100% of gas phase and 100% of liquid phase, and the fluid pressure also changes according to the pressure change of 0.6-3mpa under the crude oil, so the crude oil is a seal running under a gas-liquid-solid three-phase medium).
With the development of technology, mechanical sealing has become the mainstream sealing of screw pumps, and its sealing performance is stable, and application scope is extensive. However, the conventional single-end-face mechanical seal still has a plurality of defects for a screw pump sealing structure in the special working condition of crude oil extraction. For example, the sealing surface is easily worn by sand grains in crude oil, the thermal deformation is easily caused by high temperature of the sealing surface in a high-pressure environment, the service life is short, the sealing performance is unstable, all parts in the sealing mechanism are scattered, the on-site installation is difficult, and the missing situation of parts is easy to occur.
Disclosure of Invention
In order to overcome at least one defect in the prior art, the utility model provides a mechanical seal for a crude oil lifting double-screw pump, which has stable sealing performance, long service life and convenient installation.
The utility model provides a mechanical seal for a crude oil lifting double-screw pump, which comprises a shaft sleeve sleeved outside a rotating shaft, wherein a sealing seat is sleeved outside the shaft sleeve, one end of the shaft sleeve extends to an inner cavity of the sealing seat, a first mounting groove is formed in the inner cavity of the sealing seat and close to a medium end, an annular mounting boss is formed outside the shaft sleeve at one end of the inner cavity of the sealing seat, a primary sealing unit is arranged between one end of the mounting boss and the first mounting groove, a flange seat is connected with the other end of the sealing seat, a second mounting groove is formed between the radial inner end of the flange seat and the sealing seat, a secondary sealing unit is arranged between the other end of the mounting boss and the second mounting groove, a sealing cavity is formed between the primary sealing unit, the secondary sealing unit and the inner side wall of the sealing seat, a liquid inlet and a liquid outlet which are respectively communicated to the sealing cavity are formed in the side wall of the sealing seat, the sealing cavity pressure is higher than the medium end pressure, a plurality of driving rings are connected with one end of the shaft sleeve, a plurality of driving rings are connected with one end of the outer end of the mounting boss, a plurality of driving rings are arranged on the side walls of the side walls are connected with one end of the driving rings, a plurality of driving rings are matched with one end of positioning columns, a plurality of positioning columns are arranged on the positioning columns are matched with one side walls, and are further arranged on one side positioning columns, and the positioning columns are matched with positioning columns are formed, and are far from one side positioning columns, and one positioning column is far from one circumferential positioning column is matched with one positioning column, and can be matched with positioning, and can be matched with positioning.
Compared with the prior art, the mechanical seal for the crude oil lifting double-screw pump has the following advantages:
1. The mechanical seal structure adopts a container type design, namely, the integral preassembly of each part of the whole set of sealing device is realized before the mechanical seal is mounted in the mounting cavity, when the sealing device is mounted in the mounting cavity of the rotary evaporator, the sealing device of the container type structure is only required to be integrally mounted in a design position and is in driving connection with the rotating shaft, the mounting operation is simple, the requirements on the mounting technology are very low, the working efficiency of the assembly machine seal of workers is improved, the sealing damage or failure caused by the mounting problem is avoided to the greatest extent, the sealing maintenance cost is reduced from the other angle, and the maintenance time is saved.
2. The double-end mechanical seal is adopted, the sealing performance is higher due to the two sealing surfaces, and the secondary auxiliary seal can further play a role in sealing under the condition that the primary seal leaks, so that the sealing stability is ensured. And in this novel seal structure, a mounting boss structure is shared when two seal parts are installed, effectively shortens whole seal structure's axial dimensions to save sealed axial installation space, promote product competitiveness.
3. In addition, the pressure of the sealing cavity is larger than the pressure of the medium end, so that the grinding surface of the primary sealing unit is mainly a liquid film of the flushing liquid, particles in the medium are prevented from entering the grinding surface, the sealing surface is seriously worn, the sealing performance is ensured, and the service life is prolonged.
Further, the primary sealing unit comprises a driving ring and a main static ring assembly, one end of the installation boss is concavely provided with a first dynamic ring groove, one end of the driving ring is assembled in the first dynamic ring groove in a sealing mode, the main static ring assembly comprises a main static ring and a main static ring seat, one end of the main static ring seat is assembled in the first installation groove in a sliding mode along the axial direction in a sealing mode, the other end of the main static ring is provided with a first static ring groove, one end of the main static ring is assembled in the first static ring groove in a sealing mode, and the other end of the main static ring is abutted to the other end of the driving ring.
The improved structure is characterized in that a plurality of first positioning lugs are formed on the inner peripheral wall of the first movable ring groove and the inner peripheral wall of the first static ring groove in an protruding mode, a plurality of first positioning grooves matched with the first positioning lugs are formed on the outer peripheral wall of the driving ring and the outer peripheral wall of the main static ring respectively, annular first accommodating grooves are formed on the bottom wall of the first movable ring groove and the bottom wall of the first static ring groove respectively, a first sealing ring and an annular check block of glass fiber filled PTFE are assembled in the first accommodating grooves from inside to outside, and the outer wall of the annular check block is in sealing fit with the tail end of the driving ring or the tail end of the main static ring.
Still further, the secondary seal unit includes vice rotating ring and vice quiet ring subassembly, the other end indent of installation boss is provided with the second and moves the annular, the one end seal assembly of vice rotating ring is in the second moves the annular, vice quiet ring subassembly includes vice quiet ring and vice quiet ring holder, the one end of vice quiet ring holder is along the slidable of axial and sealed assembly in the second mounting groove, the other end is provided with the quiet annular of second, the one end seal assembly of vice quiet ring is in the quiet annular of second, the other end with the other end looks butt of vice rotating ring.
The improved structure is characterized in that a plurality of second positioning lugs are formed on the inner peripheral wall of the second movable ring groove and the inner peripheral wall of the second static ring groove in an outwards protruding mode, a plurality of second positioning grooves matched with the second positioning lugs are formed on the outer peripheral wall of the auxiliary movable ring and the outer peripheral wall of the auxiliary static ring respectively, annular second accommodating grooves are formed on the bottom wall of the second movable ring groove and the bottom wall of the second static ring groove respectively, a first sealing ring and an annular check block of glass fiber filled PTFE are arranged in the second accommodating grooves in a matched mode from inside to outside, and the outer wall of the annular check block is in sealing fit with the tail end of the auxiliary movable ring or the tail end of the auxiliary static ring.
Preferably, the main static ring, the auxiliary dynamic ring and the auxiliary static ring have the same structure, and the main static ring seat and the auxiliary static ring seat have the same structure.
Still further, elastic compensation pieces are arranged between the main static ring seat and the bottom wall of the first mounting groove and between the auxiliary static ring seat and the bottom wall of the second mounting groove, a first sealing part and a second sealing part are respectively arranged between the main static ring seat and the first mounting groove and between the auxiliary static ring seat and the second mounting groove, and the first sealing part and the second sealing part are respectively positioned at the radial outer sides corresponding to the elastic compensation pieces.
And the first sealing part and the second sealing part comprise second sealing rings and PTFE check rings which are in abutting distribution along the axial direction, and the PTFE check rings are positioned at one end close to the main static ring seat or the auxiliary static ring seat.
Still further, the sealing seat is close to the annular jump ring of joining in marriage on the inner peripheral wall of one end of first mounting groove, be provided with the location step on the outer wall of main quiet ring, work as main quiet ring subassembly pre-installation to in the first mounting groove, the jump ring with the location step offsets, so that main quiet ring subassembly with the sealing seat pre-installation is integrated into one piece structure.
Still further, the bottoms of the first mounting groove and the second mounting groove are respectively provided with an anti-rotation pin, and the main static ring seat and the auxiliary static ring seat are respectively provided with an anti-rotation pin groove.
The above-described several improvements of the present utility model will be specifically set forth in the following detailed description, and in part will be obvious from the description, or may be learned by practice of the present utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
FIG. 1 is a semi-sectional view of a mechanical seal for a crude oil lift twin screw pump of the present utility model;
FIG. 2 is an enlarged view of a portion of the section view of FIG. 1;
fig. 3 is an enlarged partial view of another location of the cross-sectional view of fig. 1.
Reference numerals illustrate:
1. A shaft sleeve; 2, a sealing seat, 3, a first mounting groove, 4, a mounting boss, 5, a flange seat, 6, a second mounting groove, 7, a sealing cavity, 8, a liquid inlet, 9, a liquid outlet, 10, a driving ring, 11, a set screw, 12, a limiting block, 13, a positioning groove, 14, a driving ring, 15, a first movable ring groove, 16, a main static ring, 17, a main static ring seat, 18, a first static ring groove, 19, a first positioning lug, 20, a first positioning groove, 21, a first accommodating groove, 22, a first sealing ring, 23, an annular stop block, 24, a secondary ring, 25, a second movable ring groove, 26, a secondary static ring, 27, a secondary static ring seat, 28, a second static ring groove, 29, a second positioning lug, 30, a second positioning groove, 31, a second accommodating groove, 32, a second sealing ring, 33, a PTFE retainer ring, 34, a clamp spring, 35, a positioning step, 36, an anti-rotation pin, 37 and an anti-rotation groove.
Detailed Description
First, it should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can adapt it as desired to suit a particular application.
In describing embodiments of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "fixed," "coupled" and "connected" are to be construed broadly, and may be, for example, fixedly coupled, detachably coupled, integrally coupled, mechanically coupled, electrically coupled, directly coupled, or indirectly coupled via an intermediate medium. The specific meaning of the above terms in embodiments of the present application will be understood in detail by those of ordinary skill in the art.
The application will be described in further detail with reference to the drawings and the specific examples.
Referring to fig. 1-3, the embodiment of the application discloses a mechanical seal for a crude oil lifting double-screw pump, which comprises a shaft sleeve 1 sleeved outside a rotating shaft, wherein a sealing ring is arranged between one end of the shaft sleeve 1 and the outer wall of the rotating shaft, and the other end of the shaft sleeve is in transmission connection with the rotating shaft.
The outer part of the shaft sleeve 1 is sleeved with a sealing seat 2, one end of the shaft sleeve 1 extends to the inner cavity of the sealing seat 2, the other end of the shaft sleeve 1 is axially exposed to the end face of the sealing seat 2, which is close to the atmosphere, the inner cavity of the sealing seat 2 is provided with a first mounting groove 3, an annular mounting boss 4 is formed outside one end of the shaft sleeve 1, which is positioned in the inner cavity of the sealing seat 2, a primary sealing unit is assembled between one end of the mounting boss 4 and the first mounting groove 3, the other end of the sealing seat 2 is connected with a flange seat 5, a second mounting groove 6 is formed between the radial inner end of the flange seat 5 and the sealing seat 2, a secondary sealing unit is assembled between the other end of the mounting boss 4 and the second mounting groove 6, a sealing cavity 7 is formed between the primary sealing unit, the secondary sealing unit and the inner side wall of the sealing seat 2, a liquid inlet 8 and a liquid outlet 9 which are respectively communicated to the sealing cavity 7 are arranged on the side wall of the sealing seat 2, and the pressure of the sealing cavity 7 is higher than the pressure of the medium end, when the mechanical sealing assembly is finished and the mechanical sealing assembly is installed in a screw pump, a corresponding auxiliary flushing system is also required to be assembled outside, the secondary flushing system is formed between the other end and the sealing seat 2, the secondary flushing fluid is prevented from being fully filled in the sealing cavity, the primary flushing fluid is prevented from entering the sealing cavity, the primary flushing fluid is completely and the primary flushing fluid, and the primary flushing fluid is completely filled in the sealing cavity, and the primary flushing fluid is completely sealed medium, and the primary sealing fluid is completely filled in the primary sealing fluid, and the primary sealing fluid is completely and the primary sealing fluid, and the primary sealing medium and the primary sealing unit.
More specifically, the outside that installation boss 4 one end was kept away from to axle sleeve 1 is connected with actuating ring 10, wears to be equipped with a plurality of inner and pivot tight fit's holding screw 11 on actuating ring 10's the lateral wall, and axle sleeve 1 is connected with the pivot transmission through holding screw 11, realizes synchronous rotation. In this structure, a plurality of connecting screws are further arranged on the side wall of the driving ring 10 in a penetrating manner, and the inner ends of the connecting screws are abutted against the outer wall of the shaft sleeve 1, so that the driving ring 10 and the shaft sleeve 1 are connected and fixed. In this structure, the size of the set screw 11 cannot be too large due to the limitation of the space size, so the set screw 11 is made of hard galvanized material, and the locking capability at 3mpa is ensured to be stable and reliable.
On the other hand, in this embodiment, still detachable is connected with a plurality of stopper 12 that distribute along circumference on the peripheral wall of actuating ring 10, and flange seat 5 is kept away from the shaping of the one end evagination of seal seat 2 has the reference column, and the shaping has positioning groove 13 on the peripheral wall of reference column, and the one end block fit of each stopper 12 is in positioning groove 13 for make seal seat 2, flange seat 5, one-level sealing unit, second grade sealing unit and axle sleeve 1 assemble as an organic whole structure, during the installation, whole mechanical seal installs with an overall structure, and is convenient, swift, can also avoid the on-the-spot equipment to appear the risk of part omission because of spare part is many. In addition, it should be noted that the positioning block in this structure is used for positioning during assembly, and plays a role in positioning at the same time, when the whole mechanical seal is mounted on the screw pump according to the set position, the whole mechanical seal needs to be disassembled, which would otherwise affect the normal operation of the mechanical seal.
In addition, in the structure, the flange seat 5 and the sealing seat 2 are detachably connected through screws along the axial direction, and a corresponding sealing ring is arranged at the joint of the end surfaces of the flange seat 5 and the sealing seat 2, so that leakage is avoided. And the inner diameter end of the flange exceeds the inner wall of the seal holder 2 near the atmosphere side, thereby forming a second mounting groove 6.
In this embodiment, the primary sealing unit includes a driving ring 14 and a primary static ring assembly, one end of the installation boss 4 is concavely provided with a first dynamic ring groove 15, one end of the driving ring 14 is sealed and assembled in the first dynamic ring groove 15, the primary static ring assembly includes a primary static ring 16 and a primary static ring seat 17, one end of the primary static ring seat 17 is axially slidably and hermetically assembled in the first installation groove 3, the other end is provided with a first static ring groove 18, one end of the primary static ring 16 is sealed and assembled in the first static ring groove 18, and the other end is in butt joint with the other end of the driving ring 14 which can rotate relatively along the circumferential direction.
More specifically, in the above structure, a plurality of first positioning lugs 19 are formed on the inner peripheral walls of the first movable ring groove 15 and the first static ring groove 18 in a protruding manner, a plurality of first positioning grooves 20 for matching with the first positioning lugs 19 are formed on the outer peripheral walls of the driving ring 14 and the main static ring 16, respectively, and preferably, the first positioning lugs 19 and the first positioning grooves 20 are four equally divided along the circumferential direction, so that stable operation of the primary sealing unit in a high torque state can be ensured. More importantly, annular first accommodating grooves 21 are respectively formed in the bottom walls of the first movable ring groove 15 and the first static ring groove 18, a first sealing ring 22 and an annular stop block 23 of glass fiber filled PTFE are arranged in the first accommodating grooves 21 from inside to outside, and the outer wall of the annular stop block 23 is in sealing fit with the tail end of the driving ring 14 or the main static ring 16. After the annular stop block 23 is arranged, a small space is reserved between the driving ring 14 and the main static ring 16 and the bottoms of the corresponding first movable ring groove 15 and the corresponding first static ring groove 18, namely, the sealing ring is not in direct contact with the metal seat, so that the grinding process of the end face of the metal seat can be omitted, the processing cost is reduced, and leakage caused by the grinding problem of the assembled end face can be avoided.
Similarly, in this embodiment, the secondary sealing unit includes a secondary moving ring 24 and a secondary stationary ring assembly, the other end of the mounting boss 4 is concavely provided with a second moving ring groove 25, one end of the secondary moving ring 24 is sealingly fitted in the second moving ring groove 25, the secondary stationary ring assembly includes a secondary stationary ring 26 and a secondary stationary ring seat 27, one end of the secondary stationary ring seat 27 is slidably and sealingly fitted in the second mounting groove 6 along the axial direction, the other end is provided with a second stationary ring groove 28, one end of the secondary stationary ring 26 is sealingly fitted in the second stationary ring groove 28, and the other end abuts against the other end of the secondary moving ring 24. In addition, a plurality of second positioning lugs 29 are formed on the inner peripheral walls of the second movable ring groove 25 and the second static ring groove 28 in an outward protruding manner, a plurality of second positioning grooves 30 for matching with the second positioning lugs 29 are formed on the outer peripheral walls of the auxiliary movable ring 24 and the auxiliary static ring 26, respectively, and the second positioning lugs 29 and the second positioning grooves 30 are equally divided into four parts along the circumferential direction in the structure. The bottom walls of the second movable ring groove 25 and the second static ring groove 28 are respectively provided with a second annular accommodating groove 31, the second accommodating groove 31 is also internally provided with the first sealing ring 22 and the annular stop block 23 of glass fiber filled PTFE from inside to outside, and the outer wall of the annular stop block 23 is in sealing fit with the tail end of the auxiliary movable ring 24 or the auxiliary static ring 26.
In the above-mentioned structure, the primary seal unit and the secondary seal unit are preferably identical in structure, and can be replaced by each other, specifically, the structures of the driving ring 14, the primary stationary ring 16, the secondary moving ring 24 and the secondary stationary ring 26 are all identical, and the structures of the primary stationary ring seat 17 and the secondary stationary ring seat 27 are also identical. And the main driving ring 14, the main static ring 16, the auxiliary dynamic ring 24 and the auxiliary static ring 26 are made of hard alloy materials, so that the deformation is small under the high-pressure operation working condition, the abrasion capability of sand grains in antigen oil is strong, the four sealing rings are universal in size, the installation is convenient, special distinction is not needed, and meanwhile, the later-stage inventory management is convenient. In this structure, the driving ring 14, the main static ring 16, the auxiliary dynamic ring 24, the auxiliary static ring 26 and the corresponding metal seat are all movable along the axial direction, and are not fixed, so that stress deformation of the sealing ring caused by different expansion coefficients at high temperature and high pressure after assembly between different materials is avoided, and the sealing performance is influenced.
In the embodiment, elastic compensation pieces are arranged between the main static ring seat 17 and the bottom wall of the first mounting groove 3 and between the auxiliary static ring seat 27 and the bottom wall of the second mounting groove 6, a first sealing part and a second sealing part are respectively arranged between the main static ring seat 17 and the first mounting groove 3 and between the auxiliary static ring seat 27 and the second mounting groove 6, and the first sealing part and the second sealing part are respectively positioned on the radial outer sides of the corresponding elastic compensation pieces. In this structure, the primary seal unit, the secondary seal unit are quiet ring compensation formula structure, can avoid the rotation of pivot to the influence of elasticity compensation force, guarantee sealing performance stable. On the other hand, the elastic compensation piece realizes sealing through the corresponding sealing part, namely, the elastic compensation piece does not contact with crude oil medium, and corrosion is avoided.
More specifically, the elastic compensation pieces in the structure all comprise a plurality of small springs which are uniformly distributed along the circumferential direction. In order to further improve the stability of elasticity compensation performance, a plurality of spring holes for accommodating the small springs are formed in the bottoms of the first mounting groove 3 and the second mounting groove 6, stability and non-toppling of the small springs in the compression process are guaranteed, and stability and reliability of the compensation performance are further guaranteed.
In addition, the first sealing part and the second sealing part related to the structure comprise a second sealing ring 32 and a PTFE check ring 33 which are in abutting distribution along the axial direction, the PTFE check ring 33 is positioned at one end close to the main static ring seat 17 or the auxiliary static ring seat 27, and the PTFE is used for preventing the sealing ring from being extruded at high pressure and ensuring the stability of sealing performance. In the structure, the O-shaped ring grooves of the first sealing part and the second sealing part are of a bidirectional pressure bearing design, the medium pressure is changed between 0.6 and 3mpa, and the bidirectional pressure bearing design ensures that the sealing is not leaked when the medium pressure is higher than the internal pressure of the sealing.
In this embodiment, an annular clamping spring 34 is assembled on the inner peripheral wall of one end of the sealing seat 2 near the first mounting groove 3, and a positioning step 35 is provided on the outer wall of the main stationary ring 16, where the clamping spring 34 is mainly used for axial limiting when the main stationary ring assembly and the sealing seat 2 are preassembled, specifically, when the main stationary ring assembly is preassembled in the first mounting groove 3, the clamping spring 34 abuts against the positioning step 35, so that the main stationary ring assembly and the sealing seat 2 are preassembled into an integral structure, thereby facilitating the installation of the subsequent shaft sleeve 1 structure and improving the assembly efficiency of the whole mechanical sealing device.
In addition, the bottoms of the first mounting groove 3 and the second mounting groove 6 are respectively provided with an anti-rotation pin 36, and the main stationary ring seat 17 and the auxiliary stationary ring seat 27 are respectively provided with an anti-rotation pin groove 37. In order to be suitable for the working conditions of high pressure and high torque, the diameter of the anti-rotation pin is larger, the effective anti-rotation capability is ensured, and the anti-rotation pin groove 37 is arranged on the metal seat and is not directly arranged on the sealing ring, so that the strength of the sealing ring is not affected.
In the description of the present application, reference to the term "present embodiment," "some embodiments," etc., means that a particular feature, mechanism, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, mechanisms, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present application should be included in the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202423157615.3U CN223634887U (en) | 2024-12-20 | 2024-12-20 | A mechanical seal for a crude oil lifting twin-screw pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202423157615.3U CN223634887U (en) | 2024-12-20 | 2024-12-20 | A mechanical seal for a crude oil lifting twin-screw pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN223634887U true CN223634887U (en) | 2025-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202423157615.3U Active CN223634887U (en) | 2024-12-20 | 2024-12-20 | A mechanical seal for a crude oil lifting twin-screw pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN223634887U (en) |
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- 2024-12-20 CN CN202423157615.3U patent/CN223634887U/en active Active
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