CN217539071U - Centrifugal fan used in central air-conditioning system or ventilation system - Google Patents
Centrifugal fan used in central air-conditioning system or ventilation system Download PDFInfo
- Publication number
- CN217539071U CN217539071U CN202222200356.2U CN202222200356U CN217539071U CN 217539071 U CN217539071 U CN 217539071U CN 202222200356 U CN202222200356 U CN 202222200356U CN 217539071 U CN217539071 U CN 217539071U
- Authority
- CN
- China
- Prior art keywords
- fixed
- blade
- chassis
- centrifugal fan
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The application discloses a centrifugal fan used in a central air-conditioning system or a ventilation system, which comprises a volute, wherein the volute is arranged on a supporting seat, an impeller is arranged in the volute, and an output shaft of a driving motor is connected to a rotating shaft of the impeller through a transmission assembly; the impeller comprises a chassis, a plurality of mounting shafts are uniformly distributed in the circumferential direction of the chassis, the center of each blade is provided with a shaft hole, and the end part of each mounting shaft penetrates through the shaft hole and then is clamped in the limiting sleeve; the fixed ends of the blades are provided with fixed cylinders, the fixed cylinders are of cylindrical structures with openings at two ends, the chassis is provided with a plurality of positioning grooves at the fixed end of each blade, the plurality of positioning grooves corresponding to each blade are positioned on a virtual circle, and the mounting shaft corresponding to each blade is positioned at the center of the virtual circle; the fixed disk is provided with an inserted bar at the corresponding position of the positioning groove, and the end part of the inserted bar penetrates through the fixed cylinder and then is inserted into the positioning groove. This application has been solved among the prior art when needing to adjust centrifugal fan's ventilation efficiency, then need renew whole centrifugal fan's problem.
Description
Technical Field
The application belongs to the technical field of non-variable volume pumps, and particularly relates to a centrifugal fan used in a central air-conditioning system or a ventilation system.
Background
The centrifugal fan is a device for increasing gas pressure and discharging gas by means of input mechanical energy, is a driven fluid machine, and is also a non-positive displacement pump. The centrifugal fan accelerates gas by using an impeller rotating at a high speed, and then decelerates and changes the flow direction, so that kinetic energy is converted into potential energy (pressure). In a single stage centrifugal fan, gas enters the impeller from an axial direction, changes to a radial direction as it flows through the impeller, and then enters the diffuser. The blades of the impeller are key parts for generating potential energy, the existing blades are usually fixedly arranged on the impeller, and if the ventilation efficiency needs to be adjusted, the whole centrifugal fan needs to be replaced, so that the cost is high, and meanwhile, the replacement operation is complex, and the labor cost is increased.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a centrifugal fan used in a central air-conditioning system or a ventilation system, and solves the problem that when the ventilation efficiency of the centrifugal fan needs to be adjusted in the prior art, the whole centrifugal fan needs to be replaced.
In order to achieve the above object, an embodiment of the present invention provides a centrifugal fan used in a central air conditioning system or a ventilation system, including a volute, a support seat, an impeller, and a driving motor;
the volute is mounted on the supporting seat, the impeller is mounted in the volute, and an output shaft of the driving motor is connected to a rotating shaft of the impeller through a transmission assembly;
the impeller comprises a chassis, a fixed disc, a connecting rod, blades, a mounting shaft, a limiting sleeve, a fixed cylinder and an inserted rod;
the chassis and the fixed disc are both circular ring surfaces, the connecting rods are arranged between the fixed disc and the chassis and are positioned at the edge of the chassis, one end of each connecting rod is fixed on the chassis, and the other end of each connecting rod is detachably connected to the fixed disc;
the mounting shafts are uniformly distributed in the circumferential direction of the chassis, the centers of the blades are provided with shaft holes, the limiting sleeves are fixed at the ends of the shaft holes, and the ends of the mounting shafts penetrate through the shaft holes and are clamped in the limiting sleeves;
the end, close to the center of the chassis, of each blade is a fixed end, the fixed end is provided with the fixed cylinder, the fixed cylinder is of a cylindrical structure with openings at two ends, the chassis is provided with a plurality of positioning grooves at the fixed end of each blade, the plurality of positioning grooves corresponding to each blade are positioned on a virtual circle, and the mounting shaft corresponding to each blade is positioned at the center of the virtual circle;
the fixed disk is provided with the inserted bar at the corresponding position of constant head tank, the tip of inserted bar passes fixed cylinder inserts the constant head tank.
In a possible implementation manner, the insertion rod comprises a reducing section and an insertion section which are connected, the large end of the reducing section is connected to the fixed disc, the small end of the reducing section is connected to one end of the insertion section, and the other end of the insertion section is used for being matched with the positioning groove.
In a possible implementation manner, each positioning groove corresponds to one of the insertion rods, and one of the insertion rods corresponding to each vane is inserted into the fixed cylinder.
In one possible implementation, the impeller further comprises a synchronous adjustment assembly, wherein the synchronous adjustment assembly comprises a middle disc, a gear ring and a gear;
the middle disc is of an annular structure, the gear ring is rotatably arranged in the middle disc, and the middle disc is arranged between the base disc and the fixed disc;
the rotating shaft of the gear is connected to the end part of the limiting sleeve, and the gear is meshed with the teeth on the inner wall of the gear ring.
In one possible implementation, the middle disc comprises a mounting ring and a pressure ring;
one side of collar is provided with the ring channel, the ring gear is installed in the ring channel, the clamping ring install in on the collar, the lateral wall of clamping ring with the lateral wall butt of ring gear.
The embodiment of the utility model provides an in one or more technical scheme, following technological effect or advantage have at least:
the embodiment of the utility model provides a centrifugal fan who uses among central air conditioning system or the ventilation system, this centrifugal fan during operation, driving motor pass through drive assembly drive impeller rotation, with gaseous acceleration during impeller rotation, make the kinetic energy convert the potential energy. When ventilation efficiency needs to be adjusted, the side plate of the volute is detached firstly, then the end parts of the fixed disk and the connecting rod are separated, the fixed disk is pulled out outwards, the fixed disk and the inserted bar move together, the inserted bar is separated after exiting from the positioning groove and the fixed cylinder, then the rotating blade is rotated on the installation shaft, further the angle of the blade is adjusted, after the blade is adjusted, the fixed cylinder aligns at one of the positioning grooves corresponding to the blade, then the angle of other blades is adjusted in the same mode, and after the angle is adjusted, the inserted bar is replaced by the installation position corresponding to the fixed cylinder. And installing a fixed disk, inserting the end part of the inserted link into the positioning groove aligned with the fixed sleeve after penetrating through the fixed cylinder, fixing the fixed disk and the connecting rod after adjusting the position of the fixed disk, and then recovering the installation of the volute side plate. The utility model discloses can adjust centrifugal fan's ventilation efficiency through the angle of adjustment blade, consequently need not to change centrifugal fan, every blade all has a plurality of constant head tanks of predetermineeing, and then the angle after guaranteeing the blade adjustment is the same, the deviation can not appear, fix the position of blade through solid fixed cylinder and inserted bar, can prevent that centrifugal fan during operation blade angle from changing the problem, the pivot of the mode fixed blade that has avoided partial centrifugal fan to pass through the butt, lead to when the impeller is high-speed rotatory, the great its angle of blade atress changes the problem easily. The utility model discloses a fixed effectual of blade, angle regulation is convenient, and operating procedure is simple, and then the cost is reduced, this centrifugal fan's impeller simple structure, and the practicality is strong, convenient to popularize and use.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some of the embodiments described in the present application, and that other drawings can be derived from these drawings by a person skilled in the art without inventive effort.
Fig. 1 is a schematic structural view of a centrifugal fan used in a central air conditioning system or a ventilation system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an impeller according to an embodiment of the present invention.
Fig. 3 is a schematic view illustrating an installation of the base plate and the blade according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an impeller provided in the second embodiment of the present invention.
Fig. 5 is an installation diagram of the chassis, the blades, the ring gear and the gear according to the second embodiment of the present invention.
Fig. 6 is an installation schematic diagram of the middle disc and the toothed ring according to the second embodiment of the present invention.
Fig. 7 is a schematic structural view of a fixing tray according to a second embodiment of the present invention.
Reference numerals are as follows: 1-a volute; 2-a supporting seat; 3-an impeller; 31-a chassis; 32-fixed disk; 33-a connecting rod; 34-a blade; 35-mounting shaft; 36-a stop collar; 37-a fixed cylinder; 38-a plunger; 39-positioning grooves; 4-driving the motor; 5-a variable diameter section; 6-insertion section; 7-a synchronous adjustment assembly; 71-a middle disc; 72-a toothed ring; 73-gear; 74-a mounting ring; 75-pressure ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1 to 7, a centrifugal fan used in a central air conditioning system or a ventilation system according to one or two embodiments of the present invention includes a volute 1, a support base 2, an impeller 3, and a driving motor 4.
The volute 1 is arranged on the supporting seat 2, the impeller 3 is arranged in the volute 1, and the output shaft of the driving motor 4 is connected to the rotating shaft of the impeller 3 through the transmission assembly.
The impeller 3 includes a base plate 31, a fixed plate 32, a plurality of connecting rods 33, blades 34, a mounting shaft 35, a stopper 36, a fixed cylinder 37, and an insert rod 38.
A plurality of installation axle 35 equipartitions are provided with the shaft hole in chassis 31's circumference, blade 34's center, and stop collar 36 is fixed in the tip in shaft hole, and the joint is in stop collar 36 after the tip of installation axle 35 passes the shaft hole.
The one end that blade 34 is close to chassis 31 center is the stiff end, and the stiff end is provided with solid fixed cylinder 37, and solid fixed cylinder 37 is both ends open-ended tubular structure, and chassis 31 all is provided with a plurality of constant head tanks 39 in the fixed end department of every blade 34, and a plurality of constant head tanks 39 that every blade 34 corresponds are located a virtual circle, and the installation axle 35 that every blade 34 corresponds is located the centre of a circle department of virtual circle.
The fixing plate 32 is provided with an insertion rod 38 at a corresponding position of the positioning groove 39, and an end of the insertion rod 38 is inserted into the positioning groove 39 after passing through the fixing cylinder 37.
It should be noted that, when the centrifugal fan works, the driving motor 4 drives the impeller 3 to rotate through the transmission assembly, and when the impeller 3 rotates, the gas is accelerated, and then is decelerated and the flow direction is changed, so that the kinetic energy is converted into potential energy. When the ventilation efficiency needs to be adjusted, the side plates of the volute 1 are firstly disassembled, then the end parts of the fixed disk 32 and the connecting rod 33 are separated, and the fixed disk 32 and the connecting rod 33 are connected by adopting a bolt assembly. The fixed disk 32 is pulled out outwards, the fixed disk 32 and the inserting rod 38 move together, the inserting rod 38 retreats from the positioning groove 39 and the fixed cylinder 37 and then is separated, then the rotor 34 is rotated on the mounting shaft 35, the angle of the rotor 34 is further adjusted, after the angle of the rotor 34 is adjusted, the fixed cylinder 37 aligns at one positioning groove 39 corresponding to the rotor 34, then the angle of other rotors 34 is adjusted in the same mode, after the angle is adjusted, the inserting rod 38 is replaced by the mounting position corresponding to the fixed cylinder 37, and the end part of the inserting rod 38 can be inserted into the groove on the fixed disk 32, so that the disassembly and the replacement are convenient. The fixed disk 32 is installed, the end part of the inserted link 38 passes through the fixed cylinder 37 and then is inserted into the positioning groove 39 aligned with the fixed sleeve, after the position of the fixed disk 32 is adjusted, the fixed disk 32 and the connecting rod 33 are fixed through the bolt assembly, and then the installation of the side plate of the volute 1 is recovered. The utility model discloses can adjust centrifugal fan's ventilation efficiency through adjustment blade 34's angle, consequently need not to change centrifugal fan, every blade 34 all has a plurality of predetermined constant head tanks 39, and then guarantee that the angle after blade 34 adjusts is the same, fix blade 34's position through solid fixed cylinder 37 and inserted bar 38, can prevent that centrifugal fan during operation blade 34 angle from changing the problem, avoided partial centrifugal fan to pass through the mode fixed blade 34 pivot of butt, when impeller 3 is high-speed rotatory, the great its angle of blade 34 atress changes the problem easily. The utility model discloses a blade 34 is fixed effectual, and angle regulation is convenient, and operating procedure is simple, and then the cost is reduced, this centrifugal fan's impeller 3 simple structure, and the practicality is strong, convenient to popularize and use.
The number and the spacing of the positioning slots 39 are set according to actual requirements.
As shown in fig. 7, in the second embodiment, the insertion rod 38 includes a diameter-changing section 5 and an insertion section 6 connected together, a large end of the diameter-changing section 5 is connected to the fixed plate 32, a small end of the diameter-changing section 5 is connected to one end of the insertion section 6, and the other end of the insertion section 6 is used for cooperating with the positioning groove 39.
It should be noted that, the hole at the center of the fixing cylinder 37 is a reducing hole matched with the reducing section 5, and when the insertion rod 38 is inserted into the fixing cylinder 37, the reducing section 5 can be tightly attached to the hole wall of the reducing hole at the center of the fixing cylinder 37 in the fastening process of the fixing disk 32, so as to ensure that the blades 34 can be firmly fixed through the insertion rod 38, prevent the blades 34 from shaking, and improve the service life of the blades 34. When the blade 34 is damaged, the limiting sleeve 36 and the inserting rod 38 can be disassembled to replace the blade 34, so that the problem that the whole fan needs to be replaced when the blade 34 of the common centrifugal fan is damaged is solved.
In this embodiment, each positioning groove 39 corresponds to one insertion rod 38, and one of the plurality of insertion rods 38 corresponding to each vane 34 is inserted into the fixed cylinder 37.
It should be noted that each positioning groove 39 corresponds to one insertion rod 38, so that after the angle of the vane 34 is adjusted, the vane 34 can be fixed without adjusting the position of the insertion rod 38.
In the second embodiment, the impeller 3 further includes a synchronous adjusting assembly 7, and the synchronous adjusting assembly 7 includes a middle disc 71, a toothed ring 72, and a gear 73.
The middle disc 71 is of an annular structure, the gear ring 72 is rotatably installed in the middle disc 71, and the middle disc 71 is arranged between the bottom disc 31 and the fixed disc 32.
The rotating shaft of the gear 73 is connected to the end of the stop collar 36, and the gear 73 is engaged with teeth on the inner wall of the toothed ring 72, as shown in fig. 5.
It should be noted that, when the angle of the blade 34 needs to be adjusted, the gear ring 72 is rotated, the gear ring 72 can simultaneously drive the plurality of gears 73 to rotate, and the gears 73 drive the blade 34 to rotate through the stop collar 36, thereby achieving the purpose of adjusting the angle simultaneously. Thereby improving the efficiency of the angle adjustment of the blades 34 and further simplifying the operation steps of the ventilation efficiency adjustment of the centrifugal fan.
In the second embodiment, the middle disc 71 includes a mounting ring 74 and a pressing ring 75.
An annular groove is formed in one side of the mounting ring 74, the toothed ring 72 is mounted in the annular groove, the pressing ring 75 is mounted on the mounting ring 74, and a side wall of the pressing ring 75 abuts against a side wall of the toothed ring 72.
The mounting ring 74 and the pressing ring 75 can fix the toothed ring 72 and achieve the purpose of rotational mounting, so that the toothed ring 72 is convenient to mount and dismount and easy to maintain.
In the present embodiment, it is apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. A centrifugal fan used in a central air conditioning system or a ventilation system is characterized in that: comprises a volute (1), a supporting seat (2), an impeller (3) and a driving motor (4);
the volute (1) is mounted on the supporting seat (2), the impeller (3) is mounted in the volute (1), and an output shaft of the driving motor (4) is connected to a rotating shaft of the impeller (3) through a transmission assembly;
the impeller (3) comprises a chassis (31), a fixed disc (32), a connecting rod (33), blades (34), a mounting shaft (35), a limiting sleeve (36), a fixed cylinder (37) and an inserted rod (38);
the chassis (31) and the fixed disk (32) are both circular ring surfaces, the connecting rods (33) are arranged between the fixed disk (32) and the chassis (31), the connecting rods (33) are positioned at the edge of the chassis (31), one end of each connecting rod (33) is fixed on the chassis (31), and the other end of each connecting rod (33) is detachably connected to the fixed disk (32);
the installation shafts (35) are uniformly distributed in the circumferential direction of the chassis (31), the center of each blade (34) is provided with a shaft hole, the limiting sleeve (36) is fixed at the end part of the shaft hole, and the end parts of the installation shafts (35) penetrate through the shaft holes and are clamped in the limiting sleeve (36);
one end, close to the center of the chassis (31), of each blade (34) is a fixed end, the fixed end is provided with the fixed cylinder (37), the fixed cylinder (37) is of a cylindrical structure with openings at two ends, the chassis (31) is provided with a plurality of positioning grooves (39) at the fixed end of each blade (34), the plurality of positioning grooves (39) corresponding to each blade (34) are located on a virtual circle, and the mounting shaft (35) corresponding to each blade (34) is located at the center of the virtual circle;
the fixing disc (32) is provided with the inserted bar (38) at the corresponding position of the positioning groove (39), and the end part of the inserted bar (38) penetrates through the fixing cylinder (37) and then is inserted into the positioning groove (39).
2. A centrifugal fan for use in a central air conditioning system or ventilation system as claimed in claim 1, wherein: inserted bar (38) are including reducing section (5) and inserting section (6) that are connected, the main aspects of reducing section (5) connect in fixed disk (32), the tip of reducing section (5) connect in inserting section (6) one end, the other end of inserting section (6) be used for with constant head tank (39) cooperation.
3. A centrifugal fan for use in a central air conditioning system or ventilation system as claimed in claim 1, wherein: each of the positioning grooves (39) corresponds to one of the insertion rods (38), and one of the insertion rods (38) corresponding to each of the vanes (34) is inserted into the fixed cylinder (37).
4. A centrifugal fan for use in a central air conditioning system or ventilation system as claimed in claim 1, wherein: the impeller (3) further comprises a synchronous adjusting assembly (7), wherein the synchronous adjusting assembly (7) comprises a central disc (71), a gear ring (72) and a gear (73);
the middle disc (71) is of an annular structure, the gear ring (72) is rotatably installed in the middle disc (71), and the middle disc (71) is arranged between the bottom disc (31) and the fixed disc (32);
the rotating shaft of the gear (73) is connected to the end part of the limiting sleeve (36), and the gear (73) is meshed with teeth on the inner wall of the gear ring (72).
5. A centrifugal fan for use in a central air conditioning system or ventilation system as claimed in claim 4, wherein: the middle disc (71) comprises a mounting ring (74) and a pressing ring (75);
one side of collar (74) is provided with the ring channel, ring gear (72) are installed in the ring channel, clamping ring (75) install in on collar (74), the lateral wall of clamping ring (75) with the lateral wall butt of ring gear (72).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222200356.2U CN217539071U (en) | 2022-08-22 | 2022-08-22 | Centrifugal fan used in central air-conditioning system or ventilation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222200356.2U CN217539071U (en) | 2022-08-22 | 2022-08-22 | Centrifugal fan used in central air-conditioning system or ventilation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217539071U true CN217539071U (en) | 2022-10-04 |
Family
ID=83422888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222200356.2U Active CN217539071U (en) | 2022-08-22 | 2022-08-22 | Centrifugal fan used in central air-conditioning system or ventilation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217539071U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117725704A (en) * | 2024-02-07 | 2024-03-19 | 浙江飞旋科技有限公司 | Design method of vaned diffuser and vaned diffuser |
-
2022
- 2022-08-22 CN CN202222200356.2U patent/CN217539071U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117725704A (en) * | 2024-02-07 | 2024-03-19 | 浙江飞旋科技有限公司 | Design method of vaned diffuser and vaned diffuser |
| CN117725704B (en) * | 2024-02-07 | 2024-05-14 | 浙江飞旋科技有限公司 | Design method of vaned diffuser and vaned diffuser |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN217539071U (en) | Centrifugal fan used in central air-conditioning system or ventilation system | |
| JP4785256B2 (en) | Piggyback rotab risk | |
| CN112628161A (en) | Air-cooled compressor | |
| CN111664124B (en) | Stator structure, rotor and stator assembly structure with same and assembly method of rotor and stator assembly structure | |
| EP3517730B1 (en) | Rotating component with a balancing weight | |
| KR20080024486A (en) | Radial compressor | |
| BR102016026445A2 (en) | GAS TURBINE ENGINE | |
| JP2001107889A (en) | Improvement of vacuum pump | |
| CN106766045B (en) | Air supply assembly and air conditioner | |
| CN219774392U (en) | Blade angle adjusting device of explosion-proof fan | |
| CN104100574A (en) | Mechanism for synchronously adjusting diffusion guide vanes of fan | |
| WO1991005150A1 (en) | Geodesic engine mount structure | |
| CN107061324B (en) | Axial fan and air conditioner with same | |
| CN213981332U (en) | Centrifugal fan impeller structure | |
| CN212389569U (en) | Sealing mechanism, axial flow compressor and gas turbine | |
| CN212337646U (en) | Multi-stage pump | |
| CN111878450A (en) | Sealing mechanism, axial flow compressor and gas turbine | |
| CN210949222U (en) | High-efficient centrifugal fan | |
| CN113074134A (en) | Sealing device between centrifugal fan casing and shaft | |
| WO2022126688A1 (en) | Wind driven generator and in-situ ventilation system for wind driven generator | |
| CN218151510U (en) | Multi-stage fan | |
| CN219299381U (en) | Rotary partition plate of steam turbine | |
| CN217002347U (en) | Fan blower | |
| CN220487893U (en) | Multi-wing centrifugal fan | |
| CN221374056U (en) | Turbine fan |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |