CN117450259A - Dry gas sealing structure with dynamic and static pressure combined controllable gap - Google Patents
Dry gas sealing structure with dynamic and static pressure combined controllable gap Download PDFInfo
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- CN117450259A CN117450259A CN202311508168.9A CN202311508168A CN117450259A CN 117450259 A CN117450259 A CN 117450259A CN 202311508168 A CN202311508168 A CN 202311508168A CN 117450259 A CN117450259 A CN 117450259A
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- 238000007789 sealing Methods 0.000 title claims abstract description 107
- 230000003068 static effect Effects 0.000 title claims abstract description 81
- 239000012530 fluid Substances 0.000 claims abstract description 32
- 239000012528 membrane Substances 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000007769 metal material Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000036961 partial effect Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
Abstract
A dry gas sealing structure of a dynamic and static pressure combined convergence gap comprises a movable ring and a static ring; the sealing end face of the movable ring is divided into a diaphragm matching face, a groove area end face provided with a fluid dynamic pressure groove and a sealing dam, and an ungrooved area on the groove area end face is the sealing dam. The static ring consists of a static ring sealing end face, a diaphragm assembly, a drainage channel, a fluid pressure equalizing groove and a static pressure hole. The sealing end face of the static ring is provided with circumferentially uniformly distributed axial drainage holes, the fluid pressure equalizing grooves are communicated through the drainage channels, the fluid pressure equalizing grooves are communicated with an external air supply pipeline through the static pressure holes, and a one-way valve is arranged on the air supply pipeline close to the static pressure holes. According to the dry gas sealing structure, gas is introduced into the sealing end face through the axial drainage hole and is started before dry gas sealing is started through the static pressure hole, and high-pressure gas at the root of the dynamic pressure groove is pressed into the pressure equalizing groove when sealing operation is normal, so that different deformations of the diaphragm are generated due to different stress on two sides, a convergence gap along the radial leakage direction of a medium is formed, and finally the dry gas sealing structure of the dynamic-static pressure combined convergence gap is formed.
Description
Technical Field
The invention relates to the technical field of shaft end sealing of rotary machinery such as various high-speed compressors, turbine pumps and the like, in particular to a dry gas sealing structure with a dynamic and static pressure combined controllable gap.
Background
The sealing end face is provided with various dynamic and static pressure grooves to enhance the bearing capacity and rigidity of the fluid film, so that the non-contact operation between sealing pairs is a common technology of gas or liquid lubrication mechanical sealing. The mechanical sealing pair consists of a movable ring rotating along with the shaft and a static ring matched with the movable ring, when the movable ring rotates, a dynamic pressure groove on the end surface of the movable ring pumps fluid medium in a sealing cavity into a sealing gap, the fluid medium flows towards a downstream low pressure side and a windward side in the groove under the combined action of medium pressure difference and circumferential shearing, and is continuously compressed in the groove, so that the pressure of a gas film on the windward side and a gas film on the groove root is increased, a dynamic pressure effect is formed, a gas film with a thickness of a few micrometers is formed between sealing end surfaces, and the sealing pair is ensured to run under the condition that the end surfaces are not contacted. The seal gap of the dry gas seal in the non-working phase is much smaller than that in the steady working phase, and the process from the opening of the end face to the formation of the steady gas film tends to cause unnecessary loss. The traditional dry gas seal can only adjust the sealing gap by applying pre-deformation in the assembly process after the processing is finished, and the sealing gap is formed by depending on a gas film with rigidity in the working stage. The end faces of the dry gas sealing dynamic ring and the dry gas sealing static ring often have failure conditions such as end face collision grinding or vibration instability and the like due to insufficient bearing capacity and rigidity of a gas film and insufficient external disturbance resistance capability in an opening stage. How to reduce the occurrence of end face collision and grinding or vibration instability phenomenon in the dry gas sealing end face opening stage or the low film thickness operation process, and realize the adaptability of quickly entering the stable operation stage becomes the key of design and application of the dry gas sealing in the shaft end sealing of various high-speed compressor, turbine pump and other rotary mechanical equipment.
Disclosure of Invention
In order to overcome the problems, the invention provides a dry gas sealing structure with a dynamic and static pressure combined controllable gap.
The technical scheme adopted by the invention is as follows: the dry gas sealing structure with the dynamic and static pressure combined controllable gap consists of a movable ring (1) and a static ring (2), wherein the inner diameter side of the static ring (2) is a low pressure side, and the outer diameter side is a high pressure side; the sealing end face of the movable ring (1) is divided into a diaphragm matching face (11), a groove area end face (12) provided with a fluid dynamic pressure groove (121) and a sealing dam (123), and an ungrooved area on the groove area end face (12) is a sealing dam (122);
the static ring (2) comprises a static ring sealing end face (21), a membrane assembly (22), a drainage channel (23), a fluid pressure equalizing groove (24) and a static pressure hole (25), wherein the membrane assembly (22) comprises a membrane (221), a membrane matching surface (26), a fastening screw (222) and a compression ring (223); the static ring sealing end face (21) is provided with axial drainage holes (231) uniformly distributed in the circumferential direction, the axial drainage holes are communicated with a fluid pressure equalizing groove (24) through a drainage channel (23), the fluid pressure equalizing groove is communicated with an external air supply pipeline through a static pressure hole (25), and a one-way valve (3) is arranged on the air supply pipeline close to the static pressure hole (25); the diaphragm (221) is made of high-strength elastic metal material and is fixed on the diaphragm matching surface (26) together with the compression ring (223) through the fastening screw (222); the drainage channel (23) of the static ring (2) is composed of an axial drainage hole (231), a radial through hole (232) and an axial outlet hole (233). The axial drainage holes (231) are communicated with the sealing end surface (21) of the static ring, the axial outlet holes (233) are communicated with the fluid pressure equalizing groove (232), and the radial through holes (232) are communicated with the static pressure holes (25) on the outer side surface of the static ring (2) and are distributed in a central symmetry mode;
when the dry gas sealing operation is normal, the inner side (2211) of the diaphragm (221) is acted by constant air pressure from the axial drainage hole (231) in the fluid pressure equalizing groove (24), the outer side (2212) of the diaphragm (221) is acted by leakage air pressure between the dynamic and static ring sealing end surfaces, the pressure difference between the inner side (2211) and the outer side (2212) gradually rises along the medium leakage direction, so that the radial micro-deformation of the diaphragm (221) correspondingly increases, and finally, a convergent gap along the medium radial leakage direction is formed between the diaphragm and the diaphragm matching surface (11).
Further, the radius of the central connecting line of the axial drainage hole (231) of the static ring sealing end surface (21) is equal to the radius of the groove root of the dynamic pressure groove (121) of the sealing end surface of the movable ring (2).
Furthermore, the groove end face (12) of the moving ring (1) is not on the same plane relative to the diaphragm matching surface (11), and the protruding height of the groove end face (12) relative to the diaphragm matching surface (11) is 0.02-0.10 mm.
Further, the static pressure hole (25) is communicated with an external air supply pipeline, and high-pressure air from the axial drainage hole (231) is prevented from entering the air supply pipeline through the one-way valve (3).
Further, the diaphragm outer end surface (2212) of the diaphragm (221) and the stationary ring sealing end surface (21) are on the same plane, and the thickness of the diaphragm (221) is 0.05-0.20 mm.
Further, the membrane (221) is tightly fixed on the stationary ring (2) by a compression ring (223) through holes of the inner ring and the outer ring by a plurality of fastening screws (222).
The principle of the invention is as follows:
the classical dry gas sealing end surface mainly comprises three parts of dynamic pressure grooves, sealing weirs and sealing weirs, wherein the sealing weirs are arranged in the areas between the circumferences of the adjacent dynamic pressure grooves, and play a role in blocking the circumferential flow of a sealing medium in the dry gas sealing operation process, and the sealing weirs are used for blocking the radial flow of the sealing medium. When the moving ring rotates, the sealing medium is pumped into the sealing gap through the dynamic pressure grooves and is boosted by the choking action of the sealing weir and the sealing dam, so that a remarkable high-pressure area is formed near the windward side wall and the groove root, and the dynamic pressure effect is more remarkable under the conditions of low film thickness and high rotating speed. A large number of theoretical researches and engineering application experience show that when the dry gas seal operates at the start-stop stage and under the low film thickness, the dry gas seal has the characteristics of small seal clearance and difficult pumping of seal gas, and the phenomena of seal instability and end face collision and grinding are extremely easy to occur in the process.
When the dry gas seal is used as a shaft end seal, high-pressure gas is introduced into the seal gap through the static pressure hole at the opening stage of the seal end face, so that the end face is quickly opened. Along with the rotation of the movable ring, a sealing medium is pumped into the sealing groove from the outer diameter side and is continuously compressed in the groove, so that the air film pressure at the windward side and the root of the groove is increased, high-pressure sealing gas at the root of the groove enters the air inlet channel through the air inlet channel at the end face of the stationary ring, and enters the fluid pressure equalizing channel through the drainage channel, and a high-pressure ring higher than the pressure of the end face gap is formed at the inner end face of the diaphragm to form a pressure difference with the sealing gap, so that the diaphragm is slightly convexly bent and deformed. When the dry gas seal enters a stable operation stage, the one-way pressure regulating valve is closed, the pressure in the fluid pressure equalizing groove is uniformly distributed along the radial direction due to the Dalton partial pressure law, and the gas pressure in the gas film gap is continuously reduced from the outer diameter to the inner diameter, so that the pressure difference between the inner diameter and the outer diameter of the diaphragm is inconsistent, the pressure difference on the side closer to the inner diameter is larger, the load acting on the diaphragm is larger, the deformation generated by the diaphragm is larger, and a convergent gap is formed between the end faces of the movable ring and the stationary ring, thereby being beneficial to pumping of sealing gas. The dry gas sealing structure with the variable gap of the air inlet in the middle of the static ring end surface with the combined dynamic and static pressure can realize the quick opening of the sealing end surface, strengthen the stability of the dry gas seal under the low film thickness operation, adapt the deformation of the diaphragm and the rotating speed pressure, and are suitable for shaft end sealing of rotary machinery under various working conditions.
The beneficial effects of the invention are as follows:
(1) The sealing end face can be opened rapidly through the static pressure Kong Yinqi, and the end face collision and grinding phenomenon is avoided.
(2) After the high-pressure gas is introduced into the fluid pressure equalizing groove, the diaphragm of the sealing end face can deform to generate a convergent gap, so that the stability of the dry gas seal in the running process is enhanced.
Drawings
FIG. 1 is a broken-off cross-sectional view of a pair of stationary moving rings in accordance with an embodiment of the present invention;
FIG. 2 is an exploded view of a dry gas seal structure of a dynamic and static pressure combined convergence gap according to an embodiment of the present invention;
FIG. 3 is a schematic end view of a rotating ring according to an embodiment of the present invention;
FIG. 4 is a schematic end view of a stationary ring mounting diaphragm according to an embodiment of the present invention;
FIG. 5 is a schematic partial cut-away three-dimensional perspective view of a stationary ring according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a diaphragm deformed under force to form a convergence gap in accordance with an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, as the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used for convenience in describing the present invention and simplifying the description based on the azimuth or positional relationship shown in the drawings, it should not be construed as limiting the present invention, but rather should indicate or imply that the devices or elements referred to must have a specific azimuth, be constructed and operated in a specific azimuth. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.
In the description of the present invention, it should be noted that unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, 2, 3, 4, 5 and 6, a dry gas seal structure of a dynamic and static pressure combined type convergence gap is disclosed. The dry gas seal consists of a movable ring 1 and a static ring 2, wherein the inner diameter side of the static ring 2 is a low pressure side, and the outer diameter side is a high pressure side. The sealing end surface of the moving ring 1 is divided into a diaphragm matching surface 11, a groove area end surface 12 provided with a hydrodynamic groove 121 and a sealing dam 123 according to different functions, and an ungrooved area on the groove area end surface 12 is a sealing dam 122. The static ring 2 is composed of a static ring sealing end face 21, a diaphragm assembly 22, a drainage channel 23, a fluid pressure equalizing groove 24 and a static pressure hole 25, wherein the diaphragm assembly 22 is composed of a diaphragm 221, a diaphragm matching surface 26 and a compression ring 223. The static ring sealing end face 21 is provided with axial drainage holes 231 which are uniformly distributed in the circumferential direction, the fluid pressure equalizing grooves 24 are communicated through the drainage channels 23, the fluid pressure equalizing grooves are communicated with an external air supply pipeline through static pressure holes 25, and the air supply pipeline is provided with a one-way valve 3 on the side close to the static pressure holes 25. The diaphragm 221 is made of a high-strength elastic metal material and is fixed to the diaphragm mating surface 26 by the fastening screw 222 and the pressing ring 223.
The drainage channel 23 of the stationary ring 2 is formed by an axial drainage aperture 231, a radial through aperture 232 and an axial outlet aperture 233. The axial drainage holes 231 are communicated with the static ring sealing end surface 21, the axial outlet holes 233 are communicated with the fluid pressure equalizing grooves 232, and the radial through holes 232 are connected with the static pressure holes 25 on the outer side surface of the static ring 2 and are distributed in a central symmetry mode. The static pressure hole 25 is used for injecting static pressure gas from an external gas supply pipeline in the sealing opening stage, and forming a static pressure gas film between sealing end surfaces so that the end surfaces are quickly opened.
In the rotating state of the moving ring 1, the pressure of the sealing gas is continuously increased in the process of flowing along the dynamic pressure groove 121 to the groove root, and the sealing gas enters the fluid pressure equalizing groove 24 through the axial drainage hole 231 on the end surface of the static ring, so that a positive pressure difference is generated between the fluid pressure equalizing groove 24 and the sealing end surface. The membrane 221 may undergo micro-deformation under the action of the air flow pressure difference between the fluid pressure equalizing groove 24 and the sealing gap, and form a convergent gap with the membrane mating surface 11. The radius of the central connecting line of the axial drainage hole 231 of the sealing end surface 21 of the static ring is equal to the radius of the groove root of the dynamic pressure groove 121 of the sealing end surface of the dynamic ring 2.
The height difference between the moving ring sealing end surface 12 of the moving ring 1 and the diaphragm matching surface 11 is provided to avoid the adverse effect of the end surface grinding caused by the contact of the diaphragm with the moving ring sealing end surface due to the overlarge deformation. The value range of the protruding height is 0.02-0.10 mm. The static pressure hole 25 is communicated with an external air supply pipeline and controls the air inlet pressure through the one-way valve 3.
The membrane 221 is tightly fixed on the stationary ring 2 by means of a compression ring 223 by using a plurality of fastening screws 222 respectively penetrating through the through holes of the inner ring and the outer ring. The diaphragm outer end surface 2212 of the diaphragm 221 is on the same plane as the stationary ring seal end surface 21, and the thickness of the diaphragm 221 is 0.05-0.20 mm.
Referring to FIG. 6, mainlyExplaining a convergence type gap formation mechanism of the dry gas seal structure of the dynamic and static pressure combined convergence type gap of the present invention. The inner diameter side of the sealing pair is a high pressure side, the outer diameter side is a low pressure side, and the sealing end face introduces high pressure gas into the sealing gap through the static pressure hole 25 in the opening stage, so that the movable ring sealing end face 12 is quickly opened. As the moving ring 1 rotates, the sealing medium is pumped into the dynamic pressure groove 121 from the outer diameter side, is continuously compressed in the groove, so that the pressure of the air film at the windward side and the groove root is increased, the high-pressure sealing gas at the groove root enters the drainage channel 23 through the axial drainage hole 233 of the static ring sealing end surface 21, enters the fluid pressure equalizing groove 24 through the axial drainage hole 233, a high-pressure air ring with the pressure higher than the end surface gap is formed in the fluid pressure equalizing groove 24, and a pressure difference is formed between the high-pressure air ring and the sealing gap, and at the moment, the load acting on the inner end surface 2211 of the diaphragm is formed from F 1 Load F greater than the outer end surface 2212 of the diaphragm 2 Thereby causing a slightly convex bending deformation of the membrane 221. When the dry gas seal enters a stable operation stage, the one-way pressure regulating valve 3 is closed, the pressure in the fluid pressure equalizing groove 24 is uniformly distributed along the radial direction due to the Dalton partial pressure law, and the pressure of the air film in the end face clearance is continuously reduced from the outer diameter to the inner diameter, so that the pressure difference between the inner diameter and the outer diameter of the diaphragm 221 is inconsistent, the pressure difference is larger when the pressure difference is larger at the inner diameter side, the load acting on the diaphragm is larger, the deformation generated by the diaphragm is larger, and a convergent clearance is formed between the end faces of the movable ring and the static ring, thereby being beneficial to pumping of sealing gas
The embodiments described in the present specification are merely examples of implementation forms of the inventive concept, and the scope of protection of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, and the scope of protection of the present invention and equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.
Claims (6)
1. The dry gas sealing structure with the dynamic and static pressure combined controllable gap consists of a movable ring (1) and a static ring (2), wherein the inner diameter side of the static ring (2) is a low pressure side, and the outer diameter side is a high pressure side; the method is characterized in that: the sealing end face of the movable ring (1) is divided into a diaphragm matching face (11), a groove area end face (12) provided with a fluid dynamic pressure groove (121) and a sealing dam (123), and an ungrooved area on the groove area end face (12) is a sealing dam (122);
the static ring (2) comprises a static ring sealing end face (21), a membrane assembly (22), a drainage channel (23), a fluid pressure equalizing groove (24) and a static pressure hole (25), wherein the membrane assembly (22) comprises a membrane (221), a membrane matching surface (26), a fastening screw (222) and a compression ring (223); the static ring sealing end face (21) is provided with axial drainage holes (231) uniformly distributed in the circumferential direction, the axial drainage holes are communicated with a fluid pressure equalizing groove (24) through a drainage channel (23), the fluid pressure equalizing groove is communicated with an external air supply pipeline through a static pressure hole (25), and a one-way valve (3) is arranged on the air supply pipeline close to the static pressure hole (25); the diaphragm (221) is made of high-strength elastic metal material and is fixed on the diaphragm matching surface (26) together with the compression ring (223) through the fastening screw (222); the drainage channel (23) of the static ring (2) is composed of an axial drainage hole (231), a radial through hole (232) and an axial outlet hole (233). The axial drainage holes (231) are communicated with the sealing end surface (21) of the static ring, the axial outlet holes (233) are communicated with the fluid pressure equalizing groove (232), and the radial through holes (232) are communicated with the static pressure holes (25) on the outer side surface of the static ring (2) and are distributed in a central symmetry mode;
when the dry gas sealing operation is normal, the inner side (2211) of the diaphragm (221) is acted by constant air pressure from the axial drainage hole (231) in the fluid pressure equalizing groove (24), the outer side (2212) of the diaphragm (221) is acted by leakage air pressure between the dynamic and static ring sealing end surfaces, the pressure difference between the inner side (2211) and the outer side (2212) gradually rises along the medium leakage direction, so that the radial micro-deformation of the diaphragm (221) correspondingly increases, and finally, a convergent gap along the medium radial leakage direction is formed between the diaphragm and the diaphragm matching surface (11).
2. The dry gas sealing structure of a dynamic and static pressure combined controllable gap as claimed in claim 1, wherein: the radius of the central connecting line of the axial drainage hole (231) of the static ring sealing end surface (21) is equal to the radius of the groove root of the dynamic pressure groove (121) of the dynamic ring (2) sealing end surface.
3. The dry gas sealing structure of a dynamic and static pressure combined controllable gap as claimed in claim 1, wherein: the groove end face (12) of the moving ring (1) is not on the same plane relative to the diaphragm matching surface (11), and the protruding height of the groove end face (12) relative to the diaphragm matching surface (11) is 0.02-0.10 mm.
4. The dry gas sealing structure of a dynamic and static pressure combined controllable gap as claimed in claim 1, wherein: the static pressure hole (25) is communicated with an external air supply pipeline, and high-pressure air from the axial drainage hole (231) is prevented from entering the air supply pipeline through the one-way valve (3).
5. The dry gas sealing structure of a dynamic and static pressure combined controllable gap as claimed in claim 1, wherein: the diaphragm outer end surface (2212) of the diaphragm (221) and the static ring sealing end surface (21) are on the same plane, and the thickness of the diaphragm (221) is 0.05-0.20 mm.
6. The dry gas sealing structure of a dynamic and static pressure combined controllable gap as claimed in claim 1, wherein: the diaphragm (221) adopts a plurality of fastening screws (222) to respectively penetrate through the through holes of the inner ring and the outer ring, and is tightly fixed on the stationary ring (2) by virtue of a compression ring (223).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311508168.9A CN117450259A (en) | 2023-11-13 | 2023-11-13 | Dry gas sealing structure with dynamic and static pressure combined controllable gap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311508168.9A CN117450259A (en) | 2023-11-13 | 2023-11-13 | Dry gas sealing structure with dynamic and static pressure combined controllable gap |
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| Publication Number | Publication Date |
|---|---|
| CN117450259A true CN117450259A (en) | 2024-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311508168.9A Pending CN117450259A (en) | 2023-11-13 | 2023-11-13 | Dry gas sealing structure with dynamic and static pressure combined controllable gap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117450259A (en) |
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2023
- 2023-11-13 CN CN202311508168.9A patent/CN117450259A/en active Pending
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