CN107489611B - Small impact gear type oil pump - Google Patents
Small impact gear type oil pump Download PDFInfo
- Publication number
- CN107489611B CN107489611B CN201710708342.2A CN201710708342A CN107489611B CN 107489611 B CN107489611 B CN 107489611B CN 201710708342 A CN201710708342 A CN 201710708342A CN 107489611 B CN107489611 B CN 107489611B
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- Prior art keywords
- floating seat
- gear
- rotating shaft
- stage
- driving gear
- Prior art date
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- 238000007789 sealing Methods 0.000 claims description 15
- 239000003921 oil Substances 0.000 abstract description 18
- 239000012208 gear oil Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 4
- 230000010349 pulsation Effects 0.000 abstract description 4
- 238000005299 abrasion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
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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
- F16N—LUBRICATING
- F16N13/00—Lubricating-pumps
- F16N13/20—Rotary pumps
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
The invention relates to the technical field of oil pumps, in particular to a small impact gear type oil pump which comprises a pump body, wherein a front stage gear, a rear stage gear, an upper floating seat and a middle floating seat are arranged in the pump body; a rotating shaft I is arranged on the central axis of the front-stage driving gear, a rotating shaft II is arranged on the rear-stage driving gear, and a rotating shaft III and a rotating shaft IV are respectively arranged on the front-stage driven gear and the rear-stage driven gear; the upper floating seat and the middle floating seat are respectively provided with a pair of round holes. The invention adopts the cooperation of the front gear and the rear gear, greatly reduces flow pulsation and pressure pulsation in the gear meshing process, and optimizes axial clearance compensation and radial dynamic balance of the gear oil pump.
Description
Technical Field
The invention relates to the technical field of oil pumps, in particular to a small impact gear type oil pump.
Background
The gear oil pump is suitable for conveying various lubricating liquids or pressure oil, and is widely applied to a plurality of mechanical systems. Traditional gear oil pump, including the pump body, locate the protecgulum and the back lid at pump body both ends respectively to and locate driving gear and driven gear in the pump body, the gear oil pump drives driven gear rotation when the operation, and fluid gets into the pump body from the inlet port and discharges from the oil outlet.
In the prior art, the gear oil pump is usually only provided with a pair of driving wheels and driven wheels, and the problems that the hydraulic oil is easy to heat, low in volumetric efficiency, low in power and short in service life in the working process of the oil pump due to the fact that the overlapping coefficient and the backlash are large when gears are meshed can occur.
Disclosure of Invention
(one) solving the technical problems
The invention aims to overcome the defects of the prior art and provide the small impact gear type oil pump which has a simple structure and can effectively improve the working efficiency and the service life of the gear type oil pump.
(II) technical scheme
The small impact gear type oil pump comprises a pump body, wherein a front pump cover and a rear pump cover are respectively arranged on the front side and the rear side of the pump body, a front stage gear, a rear stage gear, an upper floating seat and a middle floating seat are arranged in the pump body, the front stage gear comprises a front stage driving gear and a front stage driving wheel, the rear stage gear comprises a rear stage driving gear and a rear stage driving wheel, the upper floating seat comprises an upper floating seat I and an upper floating seat II, and the middle floating seat comprises a middle floating seat I and a middle floating seat II; the front-stage driving gear is characterized in that a rotating shaft I is arranged on the central axis of the front-stage driving gear, external splines are arranged at two ends of the rotating shaft I, the right end of the rotating shaft I extends out of the front pump cover, a rotating shaft II is arranged on the rear-stage driving gear, the interior of the rotating shaft II is hollow and is provided with internal splines, the left end of the rotating shaft I is inserted into the rotating shaft II, the external splines and the internal splines are meshed with each other, and a rotating shaft III and a rotating shaft IV are respectively arranged on the front-stage driven gear and the rear-stage driven gear; the upper floating seat I and the middle floating seat II are respectively arranged on the left side and the right side of the pump body, the middle floating seat I and the middle floating seat II are arranged at the middle part of the pump body, and the right end of the rotating shaft I is inserted into the round hole on the upper side of the upper floating seat I; the left end of the rotating shaft II is inserted into a round hole at the upper side of the upper floating seat II, the front-stage driving gear and the rear-stage driving gear are respectively arranged in a space formed by the upper floating seat I and the middle floating seat I, the upper floating seat II and the middle floating seat II, two ends of the rotating shaft III are respectively inserted into a round hole at the lower side of the upper floating seat I and the middle floating seat I, the front-stage driven gear is arranged in a space between the upper floating seat I and the middle floating seat I, two ends of the rotating shaft IV are respectively inserted into a round hole at the lower side of the upper floating seat II and the middle floating seat II, and the rear-stage driven gear is arranged in a space between the upper floating seat II and the middle floating seat II.
Further, a framework oil seal is arranged between the front pump cover and the rotating shaft I, and a sealing ring is arranged between the rear pump cover and the pump body.
Further, the front driving gear and the rotating shaft I, the rear driving gear and the rotating shaft II, the front driven gear and the rotating shaft III, and the rear driven gear and the rotating shaft IV are cast into an integrated structure.
Further, the front driving gear is meshed with the front driven gear, and the rear driving gear is meshed with the rear driven gear; the position relationship of the tooth profile of the front stage driving gear and the tooth profile of the rear stage driving gear on the projection plane of the front stage driving gear along the axis are positioned in the tooth grooves of the rear stage driving gear.
Furthermore, the upper floating seat I and the upper floating seat II are respectively provided with a 3-shaped groove, and a 3-shaped sealing ring is arranged in the 3-shaped groove and is respectively positioned between the upper floating seat I and the front pump cover and between the upper floating seat II and the rear pump cover; the middle floating seat II is provided with a 8-shaped groove, and an 8-shaped sealing ring is arranged in the 8-shaped groove and is positioned between the middle floating seat I and the middle floating seat II.
Further, a lining is arranged on the inner wall of the round hole.
Further, the side walls of the front driving gear and the front driven gear are respectively tightly attached to the upper floating seat I and the middle floating seat I; and the rear driving gear and the rear driven gear are respectively and tightly attached to the upper floating seat II and the middle floating seat II.
(III) beneficial effects
According to the small impact gear type oil pump provided by the invention, the front-stage gear and the rear-stage gear are matched with each other for use, so that flow pulsation and pressure pulsation in the gear meshing process are greatly reduced, and axial clearance compensation and radial dynamic balance of the gear oil pump are optimized; the upper floating seat and the middle floating seat can ensure the stability of the working operation of the gear and improve the use effect of the oil pump; the 3-shaped sealing ring and the 8-shaped sealing ring are elastic after being compressed, so that pushing compensation can be performed under the friction and abrasion states of the upper floating seat, the middle floating seat and the gear, the tight fitting between the upper floating seat, the middle floating seat and the side face of the gear is ensured, and leakage caused by formation of gaps is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only of the present invention, protecting some embodiments, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view of A-A of FIG. 1;
FIG. 3 is a cross-sectional view of B-B of FIG. 1;
FIG. 4 is a schematic diagram of the structure of the floating seat II and the 3-shaped sealing ring of the invention;
in the drawings, the list of components represented by the various numbers is as follows:
1-pump body, 2-front pump cover, 3-back pump cover, 4-front stage driving gear, 5-front stage driven gear, 6-back stage driving gear, 7-back stage driven gear, 8-upper floating seat I, 9-upper floating seat II, 10-middle floating seat I, 11-middle floating seat II, 12-rotating shaft I, 13-rotating shaft III, 14-rotating shaft IV, 15-external spline, 16-3-shaped groove, 17-framework oil seal, 18-sealing ring, 19-3-shaped sealing ring, 20-8-shaped sealing ring, 21-bushing and 22-round hole.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
As shown in fig. 1-4, a pinion type oil pump comprises a pump body 1, wherein a front pump cover 2 and a rear pump cover 3 are respectively arranged on the front side and the rear side of the pump body 1, a front-stage gear, a rear-stage gear, an upper floating seat and a middle floating seat are arranged in the pump body 1, the front-stage gear comprises a front-stage driving gear 4 and a front-stage driving wheel 5, the rear-stage gear comprises a rear-stage driving gear 6 and a rear-stage driving wheel 7, the upper floating seat comprises an upper floating seat I8 and an upper floating seat II 9, and the middle floating seat comprises a middle floating seat I10 and a middle floating seat II 11; a rotating shaft I12 is arranged on the central axis of the front-stage driving gear 4, external splines 15 are arranged at two ends of the rotating shaft I12, the right end of the rotating shaft I12 extends out of the front pump cover 2, a rotating shaft II is arranged on the rear-stage driving gear 6, the interior of the rotating shaft II is hollow and is provided with internal splines, the left end of the rotating shaft I12 is inserted into the rotating shaft II, the external splines 15 and the internal splines are meshed with each other, and a rotating shaft III 13 and a rotating shaft IV 14 are respectively arranged on the front-stage driven gear 5 and the rear-stage driven gear 7; the upper floating seat and the middle floating seat are respectively provided with a pair of round holes 22, the upper floating seat I8 and the upper floating seat II 9 are respectively arranged on the left side and the right side of the pump body 1, the middle floating seat I10 and the middle floating seat II 11 are arranged in the middle part of the pump body 1, and the right end of the rotating shaft I12 is inserted into the round holes 22 on the upper side of the upper floating seat I8; the left end of the rotation shaft II 13 is inserted into a round hole 22 on the upper side of the upper floating seat II 9, the front stage driving gear 4 and the rear stage driving gear 6 are respectively arranged in a space formed by the upper floating seat I8 and the middle floating seat I10, the upper floating seat II 9 and the middle floating seat II 11, the two ends of the rotation shaft III 13 are respectively inserted into a round hole 22 on the lower side of the upper floating seat I8 and the middle floating seat I10, the front stage driven gear 5 is arranged in a space between the upper floating seat I8 and the middle floating seat I10, the two ends of the rotation shaft IV 14 are respectively inserted into a round hole 22 on the lower side of the upper floating seat II 9 and the middle floating seat II 11, and the rear stage driven gear 7 is arranged in a space between the upper floating seat II 9 and the middle floating seat II 11.
Further, a framework oil seal 17 is arranged between the front pump cover 2 and the rotating shaft I12, and a sealing ring 18 is arranged between the rear pump cover 3 and the pump body 1.
Further, the front driving gear 4 and the rotation shaft i 12, the rear driving gear 6 and the rotation shaft ii, the front driven gear 5 and the rotation shaft iii 13, and the rear driven gear 7 and the rotation shaft iv 14 are cast into an integrated structure.
Further, the front stage driving gear 4 and the front stage driven gear 5, the rear stage driving gear 6 and the rear stage driven gear 7 are meshed with each other; the front-stage driving gear 4 and the rear-stage driving gear 6 are positioned on the projection plane along the axis, and the position relationship is that the tooth profile of the front-stage driving gear 4 is positioned in the tooth groove of the rear-stage driving gear 6, so that the abrasion between gears can be indirectly reduced, and the rotating force of the gears is increased.
Further, the upper floating seat I8 and the upper floating seat II 9 are respectively provided with a 3-shaped groove 16, and a 3-shaped sealing ring 19 is arranged in the 3-shaped groove 16 and is respectively positioned between the upper floating seat I8 and the front pump cover 2 and between the upper floating seat II 9 and the rear pump cover 3; the middle floating seat II 11 is provided with a 8-shaped groove, and an 8-shaped sealing ring 20 is arranged in the 8-shaped groove and is positioned between the middle floating seat I10 and the middle floating seat II 11.
Further, a bushing 21 is provided on the inner wall of the circular hole 22.
Further, the side walls of the front driving gear 4 and the front driven gear 5 are respectively tightly attached to the upper floating seat I8 and the middle floating seat I10; the rear driving gear 6 and the rear driven gear 7 are respectively tightly attached to the upper floating seat II 9 and the middle floating seat II 11.
In the working process of the invention, after the rotating shaft I12 rotates, the front-stage driving gear 4 rotates along with the rotating shaft I, the rear-stage driving gear 6 on the rotating shaft II also rotates along with the rotating shaft I under the cooperation of the external spline 15 and the internal spline, and then the front-stage driven gear 5 and the rear-stage driven gear 7 jointly move under the driving of the front-stage driving gear 4 and the rear-stage driving gear 6 to convey oil.
In the description herein, reference to the terms "one embodiment," "example," "specific example," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (5)
1. The small impact gear type oil pump comprises a pump body, and is characterized in that a front pump cover and a rear pump cover are respectively arranged on the front side and the rear side of the pump body, a front stage gear, a rear stage gear, an upper floating seat and a middle floating seat are arranged in the pump body, the front stage gear comprises a front stage driving gear and a front stage driving wheel, the rear stage gear comprises a rear stage driving gear and a rear stage driving wheel, the upper floating seat comprises an upper floating seat I and an upper floating seat II, and the middle floating seat comprises a middle floating seat I and a middle floating seat II; the front-stage driving gear is characterized in that a rotating shaft I is arranged on the central axis of the front-stage driving gear, external splines are arranged at two ends of the rotating shaft I, the right end of the rotating shaft I extends out of the front pump cover, a rotating shaft II is arranged on the rear-stage driving gear, the interior of the rotating shaft II is hollow and is provided with internal splines, the left end of the rotating shaft I is inserted into the rotating shaft II, the external splines and the internal splines are meshed with each other, and a rotating shaft III and a rotating shaft IV are respectively arranged on the front-stage driven gear and the rear-stage driven gear; the upper floating seat I and the middle floating seat II are respectively arranged on the left side and the right side of the pump body, the middle floating seat I and the middle floating seat II are arranged at the middle part of the pump body, and the right end of the rotating shaft I is inserted into the round hole on the upper side of the upper floating seat I; the left end of the rotating shaft II is inserted into a round hole on the upper side of the upper floating seat II, the front-stage driving gear and the rear-stage driving gear are respectively arranged in a space formed by the upper floating seat I and the middle floating seat I, the upper floating seat II and the middle floating seat II, two ends of the rotating shaft III are respectively inserted into a round hole on the lower side of the upper floating seat I and the middle floating seat I, the front-stage driven gear is arranged in a space between the upper floating seat I and the middle floating seat I, two ends of the rotating shaft IV are respectively inserted into a round hole on the lower side of the upper floating seat II and the middle floating seat II, and the rear-stage driven gear is arranged in a space between the upper floating seat II and the middle floating seat II;
a framework oil seal is arranged between the front pump cover and the rotating shaft I, and a sealing ring is arranged between the rear pump cover and the pump body;
the front driving gear and the rotating shaft I, the rear driving gear and the rotating shaft II, the front driven gear and the rotating shaft III, and the rear driven gear and the rotating shaft IV are cast into an integrated structure.
2. The pinion type oil pump according to claim 1, wherein the front stage driving gear and the front stage driven gear, the rear stage driving gear and the rear stage driven gear are meshed with each other; the position relationship of the tooth profile of the front stage driving gear and the tooth profile of the rear stage driving gear on the projection plane of the front stage driving gear along the axis are positioned in the tooth grooves of the rear stage driving gear.
3. The small impact gear type oil pump according to claim 1, wherein the upper floating seat I and the upper floating seat II are respectively provided with a 3-shaped groove, and a 3-shaped sealing ring is arranged in the 3-shaped groove and is respectively positioned between the upper floating seat I and the front pump cover and between the upper floating seat II and the rear pump cover; the middle floating seat II is provided with a 8-shaped groove, and an 8-shaped sealing ring is arranged in the 8-shaped groove and is positioned between the middle floating seat I and the middle floating seat II.
4. The pinion type oil pump according to claim 1, wherein a bushing is provided on an inner wall of the circular hole.
5. The small impact gear type oil pump according to claim 1, wherein side walls of the front stage driving gear and the front stage driven gear are closely attached to the upper floating seat i and the middle floating seat i, respectively; and the rear driving gear and the rear driven gear are respectively and tightly attached to the upper floating seat II and the middle floating seat II.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710708342.2A CN107489611B (en) | 2017-08-17 | 2017-08-17 | Small impact gear type oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710708342.2A CN107489611B (en) | 2017-08-17 | 2017-08-17 | Small impact gear type oil pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107489611A CN107489611A (en) | 2017-12-19 |
| CN107489611B true CN107489611B (en) | 2023-04-25 |
Family
ID=60646309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710708342.2A Active CN107489611B (en) | 2017-08-17 | 2017-08-17 | Small impact gear type oil pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107489611B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113482912A (en) * | 2021-08-06 | 2021-10-08 | 山东世精液压设备有限公司 | Large-discharge-capacity arc spiral gear pump without axial force |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562583A (en) * | 2012-02-10 | 2012-07-11 | 长治液压有限公司 | Triple gear pump |
| CN203420881U (en) * | 2013-06-17 | 2014-02-05 | 合肥市穗意液压技术有限公司 | Oil pump provided with double gears |
| CN103629109A (en) * | 2012-08-24 | 2014-03-12 | 无锡市东方液压件制造有限公司 | Side plate axial clearance compensation gear oil pump |
| CN203879736U (en) * | 2014-05-26 | 2014-10-15 | 苏州瀚高液压有限公司 | Hydraulic gear pump |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090041594A1 (en) * | 2007-08-09 | 2009-02-12 | Kabushiki Kaisha Toyota Jidoshokki | Variable displacement type gear pump |
-
2017
- 2017-08-17 CN CN201710708342.2A patent/CN107489611B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562583A (en) * | 2012-02-10 | 2012-07-11 | 长治液压有限公司 | Triple gear pump |
| CN103629109A (en) * | 2012-08-24 | 2014-03-12 | 无锡市东方液压件制造有限公司 | Side plate axial clearance compensation gear oil pump |
| CN203420881U (en) * | 2013-06-17 | 2014-02-05 | 合肥市穗意液压技术有限公司 | Oil pump provided with double gears |
| CN203879736U (en) * | 2014-05-26 | 2014-10-15 | 苏州瀚高液压有限公司 | Hydraulic gear pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107489611A (en) | 2017-12-19 |
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Denomination of invention: A small impact gear oil pump Granted publication date: 20230425 Pledgee: China Postal Savings Bank Co.,Ltd. Hefei Branch Pledgor: HEFEI LIWEI AUTOMOBILE OIL PUMP CO.,LTD. Registration number: Y2024980025612 |