CN219960245U - High-coaxiality rotor of bearing block and high-speed centrifugal air compressor - Google Patents
High-coaxiality rotor of bearing block and high-speed centrifugal air compressor Download PDFInfo
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- CN219960245U CN219960245U CN202320241860.9U CN202320241860U CN219960245U CN 219960245 U CN219960245 U CN 219960245U CN 202320241860 U CN202320241860 U CN 202320241860U CN 219960245 U CN219960245 U CN 219960245U
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 95
- 239000010959 steel Substances 0.000 claims abstract description 95
- 238000009434 installation Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052804 chromium Inorganic materials 0.000 abstract description 4
- 239000011651 chromium Substances 0.000 abstract description 4
- 238000007747 plating Methods 0.000 abstract description 4
- 238000003754 machining Methods 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 229910000619 316 stainless steel Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of air compressors, and particularly relates to a rotor with high coaxiality of a bearing block and a high-speed centrifugal air compressor. The rotating shaft of the rotor with high coaxiality of the bearing gear is divided into a first impeller mounting section, a first sleeve mounting section, a magnetic steel mounting section, a second sleeve mounting section and a second impeller mounting section, wherein the magnetic steel mounting section is integrally formed, the left side shaft section and the right side shaft section which are positioned on the magnetic steel mounting section and are positioned on the magnetic steel assembly are respectively a first bearing gear and a second bearing gear, the structure can facilitate the first bearing gear and the second bearing gear to be processed by one cutter after being subjected to chromium plating treatment in the processing process, and the coaxiality of the first bearing gear and the second bearing gear can be effectively improved, so that the running stability of the rotor is ensured.
Description
Technical Field
The utility model belongs to the technical field of air compressors, and particularly relates to a rotor with high coaxiality of a bearing block and a high-speed centrifugal air compressor.
Background
The air compressor can provide clean air with specific pressure for the fuel cell power generation system, and is one of key parts of the hydrogen fuel cell system. The fuel cell system requires the air compressor to be small in size and absolutely oilless, so that the high-speed direct-drive oilless centrifugal air compressor is more and more widely applied to the fuel cell air compressor.
The high-speed direct-drive oil-free centrifugal air compressor adopts a dynamic pressure air bearing, and is suitable for high-speed light-load occasions. Under a certain rotating speed condition, the high-rotating-speed rotor and the dynamic pressure air bearing are supported by an air film, and under the high-speed movement, if the coaxiality of the front bearing system and the rear bearing system is not high and the eccentric condition occurs, the foil of the air bearing is worn. Meanwhile, when the rotor is eccentric, the magnetic densities of the air gaps are not uniform due to uneven air gap distribution, so that the electromagnetic force acting on the stator and the rotor is uneven, unbalanced magnetic pulling force appears, and the eccentricity is aggravated. This causes not only a change in the output torque and torque ripple, but also an imbalance in the entire rotor system, resulting in serious mechanical failure.
If the coaxiality of the front bearing system and the rear bearing system is required to be improved, the most basic method firstly needs to improve the coaxiality of the front bearing rail and the rear bearing rail of the rotor rotating shaft 1, ensure the reliable use of the air bearing and improve the service life and the performance of the air bearing.
Disclosure of Invention
The utility model aims to provide a rotor with high coaxiality of bearing blocks and a high-speed centrifugal air compressor, so that the coaxiality of front and rear bearing blocks of a rotor rotating shaft is improved, and the reliable use of an air bearing is ensured.
In order to solve the technical problems, the present utility model provides a rotor with high coaxiality of a bearing gear, comprising: the rotating shaft is provided with a first impeller mounting section, a first sleeve mounting section, a magnetic steel mounting section, a second sleeve mounting section and a second impeller mounting section in sequence from left to right along the axial direction of the rotating shaft; the magnetic steel assembly is arranged in the middle of the magnetic steel installation section; the magnetic steel installation section is integrally formed, and shaft sections positioned on the left side and the right side of the magnetic steel assembly on the magnetic steel installation section are respectively a first bearing gear and a second bearing gear.
Further, the shaft bodies at the first bearing gear and the second bearing gear are chromed.
Further, the magnetic steel assembly includes: the magnetic steel is sleeved on the magnetic steel mounting section; the steel sleeve is wrapped on the periphery of the magnetic steel; and the first balance ring and the second balance ring are respectively arranged at the two end sides of the magnetic steel installation section and are abutted with the two ends of the magnetic steel.
Further, the magnetic steel, the first balance ring and the second balance ring are in interference fit with the shaft body of the rotating shaft; the steel sleeve is in interference fit with the periphery of the magnetic steel.
Further, the diameter of the magnetic steel installation section is larger than that of the first sleeve installation section, and the diameter of the first sleeve installation section is larger than that of the first impeller installation section; the diameter of the magnetic steel installation section is larger than that of the second sleeve installation section, and the diameter of the second sleeve installation section is larger than that of the second impeller installation section.
Further, the first impeller mounting section and the first sleeve mounting section are formed with first stepped portions; a first impeller is sleeved on the first impeller mounting section; the left end of the first impeller, which is positioned on the first impeller mounting section, is provided with a first locking nut which is used for propping the right end of the first impeller against the first step part.
Further, a second step part is formed at the joint of the first sleeve mounting section and the magnetic steel mounting section; the first sleeve mounting section is sequentially provided with a first sleeve and a thrust disc from left to right; the right end of the first impeller is suitable for propping the first sleeve barrel and the thrust disc against the second step part.
Further, a third step part is formed at the joint of the second sleeve mounting section and the second impeller mounting section; a second impeller is sleeved on the second impeller mounting section; and a second locking nut is arranged at the right end of the second impeller on the second impeller mounting section and used for propping the left end of the second impeller against the third step part.
Further, a fourth step part is formed at the joint of the magnetic steel installation section and the second sleeve installation section; a second sleeve is arranged on the second sleeve mounting section; the left end of the second impeller is suitable for propping the second sleeve against the fourth step part.
In still another aspect, the present utility model also provides a high-speed centrifugal air compressor, including: a housing, and a rotor with high coaxiality of the bearing block as described above mounted in the housing.
The utility model has the beneficial effects that the rotating shaft of the rotor with high coaxiality of the bearing gear is divided into the first impeller mounting section, the first sleeve mounting section, the magnetic steel mounting section, the second sleeve mounting section and the second impeller mounting section, wherein the magnetic steel mounting section is integrally formed, and the shaft sections positioned on the left side and the right side of the magnetic steel assembly on the magnetic steel mounting section are respectively the first bearing gear and the second bearing gear, so that the first bearing gear and the second bearing gear can be conveniently processed by one cutter after being subjected to chromium plating treatment in the processing process, the coaxiality of the first bearing gear and the second bearing gear can be effectively improved, and the running stability of the rotor is ensured.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a high coaxiality rotor of the present utility model;
FIG. 2 is a cross-sectional view of a high coaxiality rotor of the present utility model;
fig. 3 is a schematic view of the rotation shaft of the rotor with high coaxiality of the bearing block of the present utility model.
In the figure:
the device comprises a rotating shaft 1, a first impeller mounting section 11, a first sleeve mounting section 12, a magnetic steel mounting section 13, a second sleeve mounting section 14 and a second impeller mounting section 15;
the magnetic steel assembly 2, the magnetic steel 21, the steel sleeve 22, the first balance ring 23 and the second balance ring 24;
a first bearing block 3 and a second bearing block 4;
a first step 51, a second step 52, a third step 53, a fourth step 54;
a first impeller 61, a second impeller 62;
a first lock nut 71, a second lock nut 72;
a first sleeve 81, a second sleeve 82;
a thrust disc 9.
Description of the embodiments
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The rotating shaft 1 of the rotor is a typical multi-cylindrical-surface combined part due to different matching relations and overall machine installation requirements, and a plurality of cylinders are coaxially arranged and are arranged in a stepped axial direction in a sectional manner. Since the machining precision of the common lathe is 0.01mm, the subsequent process is usually finished by a grinding machine for the dimension with high precision requirement. Although the machining precision of the grinding machine is very high, the machining rotating shaft 1 of the common grinding machine can reach the precision of plus or minus 0.005mm, and the workpiece is small in equipment or can reach the precision of plus or minus 0.002 mm. However, the high-speed direct-driven oil-free centrifugal air compressor has high coaxiality requirements of front and rear air bearing blocks, the machining precision requirements of the bearing blocks of the rotating shaft 1 are higher, at least the requirements of goodphi 0.005 are required to be met, and meanwhile, the geometric precision, rigidity, thermal deformation, motion stability, vibration resistance and the like of a grinding machine are more or less influenced on the machining precision of a workpiece, particularly, the front and rear bearing blocks are required to be machined respectively because of step interference on the rotating shaft 1, and the common grinding machine is difficult to guarantee the precision requirements because of the comprehensive reasons: in a general case, the dimensional accumulation tolerance of the front and rear bearing sections is Δ1, the form and position accumulation tolerance is Δ2, the machining accumulation tolerance is Δ3, and when the accumulation tolerance Δtotal= Δ1+Δ2+Δ3, the requirement that the bearing gear of the rotating shaft 1 reaches excellentphi 0.005 is extremely difficult to reach.
The related art discloses a traditional rotor structure, wherein a magnetic steel gear and a bearing gear are in a step shape, so that on one hand, the damage or the damage of a rotating shaft and an air bearing is easily caused, and the hidden factors of abnormality or failure are increased; on the other hand, the processing cost and period are also greatly increased.
Based on the above, the utility model provides the rotor with high coaxiality of the bearing blocks and the high-speed centrifugal air compressor, so that the coaxiality of the front bearing block and the rear bearing block of the rotor rotating shaft is improved, and the reliable use of the air bearing is ensured.
Example 1
As shown in fig. 1, this embodiment provides a rotor with high coaxiality of bearing steps, including: the rotating shaft 1 is provided with a first impeller mounting section 11, a first sleeve mounting section 12, a magnetic steel mounting section 13, a second sleeve mounting section 14 and a second impeller mounting section 15 in sequence from left to right along the axial direction; the magnetic steel assembly 2 is arranged in the middle of the magnetic steel installation section 13; the magnetic steel installation section 13 is integrally formed, and shaft sections on the left side and the right side of the magnetic steel assembly 2 on the magnetic steel installation section 13 are respectively a first bearing gear 3 and a second bearing gear 4.
In this embodiment, the rotating shaft 1 is divided into a first impeller mounting section 11, a first sleeve mounting section 12, a magnetic steel mounting section 13, a second sleeve mounting section 14 and a second impeller mounting section 15, wherein the magnetic steel mounting section 13 is integrally formed, and the shaft sections on the left and right sides of the magnetic steel assembly 2 on the magnetic steel mounting section 13 are respectively a first bearing rail 3 and a second bearing rail 4, so that the first bearing rail 3 and the second bearing rail 4 can be conveniently processed by one tool after being subjected to chromium plating treatment in the processing process, the coaxiality of the first bearing rail 3 and the second bearing rail 4 can be effectively improved, and the running stability of the rotor 1 is ensured.
In this embodiment, it is preferable that the shaft bodies at the first bearing stage 3 and the second bearing stage 4 are chrome-plated.
As shown in fig. 2, in this embodiment, optionally, the magnetic steel assembly 2 includes: the magnetic steel 21 is sleeved on the magnetic steel mounting section 13; the steel sleeve 22 is wrapped on the periphery of the magnetic steel 21; and a first balance ring 23 and a second balance ring 24 respectively mounted on the two end sides of the magnetic steel mounting section 13 and abutting against the two ends of the magnetic steel 21.
In this embodiment, the magnetic steel 21 is optionally adapted to cooperate with a stator (not shown) to drive the rotor assembly in rotation; the steel sleeve 22 is made of a non-magnetic conductive material, and can be, but not limited to, 316 stainless steel;
in this embodiment, as an optional assembly manner, the assembly process of the steel sleeve 22, the first balance ring 23 and the second balance ring 24 is hot sleeve assembly, the first balance ring 23 is first hot sleeve assembled, and the right end of the first balance ring 23 abuts against the left end of the magnetic steel 21 when hot sleeve is in place; the steel sleeve 22 is assembled by hot sleeve, and when the hot sleeve is in place, the left end of the steel sleeve 22 is propped against the right end of the first balance ring 23; finally, the second balance ring 24 is sleeved, and when the sleeve is in place, the left end of the second balance ring 24 is propped against the right end of the magnetic steel 21; to ensure that the jacket is in place, the dimension of the steel jacket 22 in the left-right direction should be no greater than the dimension of the magnetic steel 21 in the left-right direction; the materials of the first balance ring 6 and the second balance ring 7 are non-magnetic materials, such as 316 stainless steel, so that the performance is ensured, and meanwhile, the follow-up work of dynamic balance correction is facilitated.
In this embodiment, preferably, the magnetic steel 21, the first balance ring 23, and the second balance ring 24 are all in interference fit with the shaft body of the rotating shaft 1; the steel sleeve 22 is in interference fit with the periphery of the magnetic steel 21.
In this embodiment, the first and second balancing rings 23 and 24 are provided to limit the position of the magnetic steel 21 in the steel sleeve 22, so as to avoid the magnetic steel 21 from moving in the steel sleeve 22, thereby ensuring the rotation stability of the rotor assembly.
As shown in fig. 3, in the present embodiment, the diameter of the magnetic steel mounting section 13 is larger than the first sleeve mounting section 12, and the diameter of the first sleeve mounting section 12 is larger than the first impeller mounting section 11; the diameter of the magnetic steel mounting section 13 is larger than that of the second sleeve mounting section 14, and the diameter of the second sleeve mounting section 14 is larger than that of the second impeller mounting section 15.
In the present embodiment, as shown in fig. 2 and 3, it is preferable that the first impeller mounting section 11 and the first sleeve mounting section 12 are formed with a first step 51; the first impeller mounting section 11 is sleeved with a first impeller 61; the left end of the first impeller mounting section 11, which is located at the first impeller 61, is provided with a first lock nut 71 for abutting the right end of the first impeller 61 against the first step portion 51.
In the present embodiment, the first lock nut 71 abuts the right end of the first impeller 61 against the first stepped portion 51, ensuring the stability of the rotor rotation; the length of the first impeller mounting section 11 may be greater than the sum of the lengths of the first lock nut 71 and the first impeller 61.
In this embodiment, preferably, a second step 52 is formed at the connection between the first sleeve mounting section 12 and the magnetic steel mounting section 13; the first sleeve mounting section 12 is provided with a first sleeve 81 and a thrust disc 9 in sequence from left to right; the right end of the first impeller 61 is adapted to abut the first sleeve 81, the thrust disc 9 against the second step 52.
In the present embodiment, preferably, a third step 53 is formed at the junction of the second sleeve mounting section 14 and the second impeller mounting section 15; a second impeller 62 is sleeved on the second impeller mounting section 15; a second lock nut 72 is disposed on the second impeller mounting section 15 and located at the right end of the second impeller 62, and is used for abutting the left end of the second impeller 62 against the third step portion 53.
In this embodiment, preferably, a fourth step 54 is formed at the connection between the magnetic steel mounting section 13 and the second sleeve mounting section 14; a second sleeve 82 is provided on the second sleeve mounting section 14; the left end of the second impeller 62 is adapted to abut the second sleeve 82 against the fourth step 54.
Example 2
On the basis of embodiment 1, this embodiment provides a high-speed centrifugal air compressor, including: a housing, and a rotor mounted within the housing with high concentricity as described in example 1.
In summary, the rotating shaft 1 of the rotor with high coaxiality of the bearing gear is divided into the first impeller mounting section 11, the first sleeve mounting section 12, the magnetic steel mounting section 13, the second sleeve mounting section 14 and the second impeller mounting section 15, wherein the magnetic steel mounting section 13 is integrally formed, and the shaft sections on the left side and the right side of the magnetic steel assembly 2 on the magnetic steel mounting section 13 are respectively the first bearing gear 3 and the second bearing gear 4, so that the first bearing gear 3 and the second bearing gear 4 can be conveniently processed by one tool after being subjected to chromium plating treatment in the processing process, the coaxiality of the first bearing gear 3 and the second bearing gear 4 can be effectively improved, and the running stability of the rotor 1 is ensured; the first impeller 61, the second impeller 62, the first sleeve 81, the second sleeve 82 and the thrust disk 9 are high in mounting stability, and the running stability of the rotor is ensured.
The components (components not illustrating the specific structure) selected in the present utility model are common standard components or components known to those skilled in the art, and the structures and principles thereof are known to those skilled in the art through technical manuals or through routine experimental methods.
In the description of embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.
Claims (10)
1. A rotor with high coaxiality of bearing blocks, comprising: the rotating shaft (1) is sequentially provided with a first impeller mounting section (11), a first sleeve mounting section (12), a magnetic steel mounting section (13), a second sleeve mounting section (14) and a second impeller mounting section (15) from left to right along the axial direction of the rotating shaft; the magnetic steel assembly (2) is arranged in the middle of the magnetic steel installation section (13); the magnetic steel installation section (13) is integrally formed, and shaft sections on the left side and the right side of the magnetic steel assembly (2) on the magnetic steel installation section (13) are respectively a first bearing gear (3) and a second bearing gear (4).
2. The rotor of high coaxiality of bearing blocks according to claim 1, characterized in that the shaft bodies at the first bearing block (3) and the second bearing block (4) are chromed.
3. The rotor of high coaxiality of a bearing block according to claim 2, characterized in that the magnetic steel assembly (2) comprises: the magnetic steel (21) is sleeved on the magnetic steel mounting section (13); the steel sleeve (22) is wrapped on the periphery of the magnetic steel (21); and the first balance ring (23) and the second balance ring (24) are respectively arranged on two end sides of the magnetic steel (21) of the magnetic steel mounting section (13) and are abutted with two ends of the magnetic steel (21).
4. A rotor with high coaxiality according to claim 3, characterized in that the magnetic steel (21), the first balance ring (23) and the second balance ring (24) are in interference fit with the shaft body of the rotating shaft (1); the steel sleeve (22) is in interference fit with the periphery of the magnetic steel (21).
5. The rotor of high coaxiality of a bearing block according to claim 1, characterized in that the diameter of the magnetic steel mounting section (13) is larger than the first sleeve mounting section (12), the diameter of the first sleeve mounting section (12) is larger than the first impeller mounting section (11); the diameter of the magnetic steel installation section (13) is larger than that of the second sleeve installation section (14), and the diameter of the second sleeve installation section (14) is larger than that of the second impeller installation section (15).
6. The rotor of high coaxiality of a bearing block according to claim 5, characterized in that the first impeller mounting section (11) and the first sleeve mounting section (12) are formed with a first step (51); a first impeller (61) is sleeved on the first impeller mounting section (11); a first lock nut (71) is arranged at the left end of the first impeller (61) on the first impeller mounting section (11) and used for abutting the right end of the first impeller (61) on the first step part (51).
7. The rotor with high coaxiality of the bearing gear according to claim 6, wherein a second step part (52) is formed at the joint of the first sleeve mounting section (12) and the magnetic steel mounting section (13), and a first sleeve (81) and a thrust disc (9) are sequentially arranged on the first sleeve mounting section (12) from left to right; the right end of the first impeller (61) is suitable for abutting the first sleeve (81) and the thrust disc (9) on the second step part (52).
8. The rotor of high coaxiality of a bearing block according to claim 6, characterized in that a third step (53) is formed at the junction of the second sleeve mounting section (14) and the second impeller mounting section (15); a second impeller (62) is sleeved on the second impeller mounting section (15); and a second locking nut (72) is arranged at the right end of the second impeller (62) on the second impeller mounting section (15) and used for abutting the left end of the second impeller (62) on the third step part (53).
9. The rotor of high coaxiality of a bearing gear according to claim 8, characterized in that a fourth step (54) is formed at the junction of the magnetic steel mounting section (13) and the second sleeve mounting section (14); a second sleeve (82) is arranged on the second sleeve mounting section (14); the left end of the second impeller (62) is suitable for abutting the second sleeve (82) on the fourth step part (54).
10. A high-speed centrifugal air compressor, comprising: a housing and a high coaxiality rotor of a bearing rail as claimed in any one of claims 1 to 9 mounted in the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320241860.9U CN219960245U (en) | 2023-02-17 | 2023-02-17 | High-coaxiality rotor of bearing block and high-speed centrifugal air compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320241860.9U CN219960245U (en) | 2023-02-17 | 2023-02-17 | High-coaxiality rotor of bearing block and high-speed centrifugal air compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219960245U true CN219960245U (en) | 2023-11-03 |
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ID=88538986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320241860.9U Active CN219960245U (en) | 2023-02-17 | 2023-02-17 | High-coaxiality rotor of bearing block and high-speed centrifugal air compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219960245U (en) |
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2023
- 2023-02-17 CN CN202320241860.9U patent/CN219960245U/en active Active
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