CN110630550B - Fan assembly, heat exchanger and control method of heat exchanger - Google Patents
Fan assembly, heat exchanger and control method of heat exchanger Download PDFInfo
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- CN110630550B CN110630550B CN201910850561.3A CN201910850561A CN110630550B CN 110630550 B CN110630550 B CN 110630550B CN 201910850561 A CN201910850561 A CN 201910850561A CN 110630550 B CN110630550 B CN 110630550B
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- fan
- fan blade
- guide ring
- fan assembly
- detection device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/007—Conjoint control of two or more different functions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a fan assembly which comprises a fan blade and a top plate, wherein the fan blade is driven by a motor to rotate, the top plate is arranged above the fan blade, a flow guide ring is arranged on the bottom surface of the top plate, the flow guide ring and the fan blade are coaxially arranged, the fan assembly also comprises a gap detection device for detecting a gap between the fan blade and the flow guide ring, and whether the fan blade and the flow guide ring are eccentric or not is judged by detecting the gap detection device. The invention also discloses a heat exchanger and a control method of the fan assembly. The fan assembly is provided with the gap detection device on the top plate, and the gap detection device is used for detecting the gap between the fan blade and the flow guide ring, so that the fan blade is effectively prevented from being scraped to the flow guide ring, the abrasion of the fan blade is avoided, the service life of equipment is prolonged, the air quantity is ensured, and the reliability of the unit is improved.
Description
Technical Field
The invention relates to a fan, in particular to a fan assembly capable of detecting a gap between a fan blade and a flow guide ring, a heat exchanger and a control method of the fan assembly.
Background
The existing air-cooled refrigeration equipment needs fan blades to dissipate heat of a heat exchanger, and the fan blades are generally matched with a flow guide ring to ensure that a unit has enough air volume for heat dissipation. The existing fan blades are generally fixedly assembled by a sheet metal bracket, and due to the fact that sheet metal machining errors are large and assembly errors exist in the assembly process, the installed fan blades and the guide ring are eccentric, the air quantity of the fan blades is influenced, and the unit performance is greatly reduced; because the clearance between the fan blade and the flow guide ring is very small, the assembly error of the fan blade easily causes the fan blade to scrape the flow guide ring and abrade the fan blade.
Disclosure of Invention
The invention aims to provide a fan assembly, a heat exchanger and a control method thereof, which aim to solve the technical problems mentioned in the background technology.
In order to achieve the purpose, the specific technical scheme of the fan assembly, the heat exchanger and the control method thereof is as follows:
the utility model provides a fan assembly, includes fan blade and roof, and the fan blade passes through motor drive and rotates, and the roof setting is in the fan blade top, and the roof bottom surface sets up the water conservancy diversion circle, and the water conservancy diversion circle sets up with the axle center with the fan blade, still includes the clearance detection device who is used for detecting the gap between fan blade and the water conservancy diversion circle, judges whether eccentric with the water conservancy diversion circle through detecting clearance detection device.
Furthermore, the clearance detection device is fixed on the top plate outside the flow guide ring and comprises a main support frame, the main support frame is in an inverted L shape, the bottom end of the main support frame is provided with an auxiliary support frame, and the auxiliary support frame is provided with a distance sensor.
Furthermore, the distance sensor is a proximity switch, the detection end of the proximity switch faces the fan blade, and the proximity switch is electrically connected with the controller.
Furthermore, the number of the auxiliary support frames is two, the auxiliary support frames are bent and formed relative to the main support frame, the auxiliary support frames and the main support frame are of a bending structure facing the fan blade, the two auxiliary support frames are respectively provided with proximity switches for measuring different gap distances, and the proximity switches are respectively fixed on the auxiliary support frames through nuts.
Furthermore, a wire fixing hook is arranged on the main support frame far away from the fan blade, and when the proximity switch is fixed on the auxiliary support frame, the connecting wire is fixed on the wire fixing hook.
Further, the motor is fixed in the backup pad through a mounting panel and a supporting beam, and the motor is fixed in the mounting panel, and the mounting panel is fixed on a supporting beam, and a supporting beam's quantity is two and parallel to each other, sets up the connecting rod in the backup pad, and the tip of supporting beam passes through the fastener to be fixed on the connecting rod, and the other end of a supporting beam passes through the fastener with the support and is connected.
Further, the fan assembly further comprises a fine adjustment structure, the fine adjustment structure comprises first waist-shaped holes formed in four corners of the mounting plate, second fixing nuts suitable for matching with the first waist-shaped holes are arranged in the middle of the supporting beam, and the fan blade and the flow guide ring are coaxial by adjusting the distance between the mounting plate and the supporting plate by adjusting the position of the fastener and the first waist-shaped holes.
Furthermore, the fine adjustment structure further comprises second waist-shaped holes formed in two end portions of the supporting beam, fixing nuts matched with the second waist-shaped holes are respectively arranged on the connecting rod and the support, and the positions of the motor shaft center line along the direction of the connecting rod are adjusted by adjusting the positions of the fasteners and the second waist-shaped holes, so that the fan blade and the flow guide ring are coaxial.
A heat exchanger comprises a heat exchanger body and a fan assembly used for radiating heat of the heat exchanger, wherein the fan assembly is the fan assembly.
A control method of a fan assembly mainly comprises the following steps:
whether the fan blade and the guide ring have an eccentric phenomenon is judged by detecting a signal of the gap detection device, the signal of the gap detection device is detected within a certain time, and when an abnormal signal is detected, the abnormal judgment is made after a period of time.
Further, the detection time interval of the adjacent two-time gap detection device is 20ms-30ms, and when an abnormal signal is detected, the abnormal judgment is made after delaying for 2s-3 s.
Further, when the gap detection device detects that the distance from the fan blade to the guide ring is less than 6mm, the fan blade is eccentric, the controller sends out maintenance warning information, and the unit continues to operate without stopping; when the gap detection device detects that the distance from the fan blade to the flow guide ring is less than 3mm, the fan blade is eccentric, the unit is shut down for protection, and the controller sends alarm information.
The fan assembly, the heat exchanger and the control method thereof have the following advantages:
the fan assembly is provided with the gap detection device on the top plate, and the gap detection device is used for detecting the gap between the fan blade and the flow guide ring, so that the fan blade is effectively prevented from being scraped to the flow guide ring, the abrasion of the fan blade is avoided, the service life of equipment is prolonged, the air quantity is ensured, and the reliability of the unit is improved.
Furthermore, the fan assembly provided by the invention adjusts the position of the motor by arranging the fine adjustment structure, and when the gap detection device detects that the fan blades and the flow guide ring are eccentric, the motor is two-dimensionally adjusted in a plane by the fine adjustment structure, so that the adjustability of the system is improved.
Finally, the control method is simple and convenient, and the eccentricity phenomenon of the fan blade and the flow guide ring can be monitored in real time through the gap detection device, so that early prevention can be found early.
Drawings
FIG. 1 is an exploded view of a fan assembly of the present invention;
FIG. 2 is a schematic structural view of a fan assembly of the present invention;
FIG. 3 is a front view of the fan assembly of the present invention;
FIG. 4 is a cross-sectional view taken along plane A-A' of FIG. 3;
FIG. 5 is a schematic structural diagram of a gap detecting device according to the present invention;
FIG. 6 is a top view of the gap sensing device of the present invention;
FIG. 7 is a left side view of the gap sensing apparatus of the present invention;
FIG. 8 is a schematic view of the construction of the mounting plate of the present invention;
FIG. 9 is a schematic structural view of a support beam according to the present invention.
The reference numbers in the figures illustrate: 1. a support plate; 11. a connecting rod; 2. a fan blade; 3. a top plate; 31. a flow guide ring; 4. a motor; 5. mounting a plate; 51. a fixed seat; 52. a first waist-shaped hole; 6. a gap detection device; 61. a main supporting frame; 62. a secondary support frame; 63. a proximity switch; 64. a wire fixing hook; 65. a first fixing nut; 7. a support beam; 71. a second waist-shaped hole; 72. a second fixing nut; 8. and (4) a bracket.
Detailed Description
For better understanding of the objects, structure and functions of the present invention, a fan assembly, a heat exchanger and a control method thereof according to the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-4, the fan assembly of the present invention includes a support plate 1, a motor 4, a fan blade 2, and a top plate 3, wherein the motor 4 is fixed on the support plate 1, the fan blade 2 is fixed on an output shaft of the motor 4, the top plate 3 is fixed on the support plate 1 above the fan blade 2, a baffle ring 31 is arranged on a bottom surface of the top plate 3, the baffle ring 31 and the motor 4 are coaxially arranged, the fan assembly further includes a gap detection device 6 for detecting a gap between the fan blade 2 and the baffle ring 31, the gap detection device 6 is fixed on the top plate 3 outside the baffle ring 31, and whether the fan blade 2 and the baffle ring 31 have an eccentricity phenomenon is determined by detecting a signal of the gap detection device 6.
Further, the gap detection device 6 comprises a main support frame 61, the main support frame 61 is in an inverted L shape, an auxiliary support frame 62 is arranged at the bottom end of the main support frame 61, a distance sensor used for detecting the gap between the fan blade 2 and the flow guide ring 31 is arranged on the auxiliary support frame 62, and the distance sensor can select a proximity switch 63, an ultrasonic sensor, a laser displacement sensor and the like. Preferably, the distance sensor is a proximity switch 63, and a detection end of the proximity switch 63 is arranged towards the fan blade 2.
Further, as shown in fig. 5 to 7, the number of the secondary support frames 62 is two, the two secondary support frames 62 are respectively provided with the proximity switches 63 for measuring different gap distances, for example, the two proximity switches 63 are respectively the proximity switch 63 for detecting that an object is present within a distance of 6mm and the proximity switch 63 for detecting that an object is present within a distance of 2mm and sending a signal, when the proximity switches 63 with different distances send a signal, it indicates that the fan blade 2 and the baffle ring 31 are eccentric, and corresponding exception handling is performed to make the fan blade 2 and the baffle ring 31 coaxial, and the proximity switches 63 are respectively fixed on the secondary support frames 62 through M4 nuts.
Further, the auxiliary support frame 62 and the main support frame 61 are thin sheet metal parts, the auxiliary support frame 62 is formed by bending relative to the main support frame 61, the auxiliary support frame 62 and the main support frame 61 are in a bending structure facing the fan blade 2, and the angle between the auxiliary support frame 62 and the main support frame 61 can be manually adjusted according to different sizes of the flow guide ring 31.
In order to avoid the connecting wire of the proximity switch 63 from being scraped by the fan blade 2, the main support frame 61 far away from the fan blade 2 is provided with a wire fixing hook 64, and after the proximity switch 63 is fixed on the auxiliary support frame 62, the connecting wire is fixed on the wire fixing hook 64.
A first fixing nut 65 is provided at the top end of the main support frame 61, and a screw is fixed to the first fixing nut 65 through a mounting hole of the top plate 3, thereby fixing the gap detecting device 6 to the top plate 3.
In order to detect the gap detection device 6 in real time and judge the abnormity according to the detection signal, the gap detection device 6 is electrically connected with the controller, whether the fan blade 2 and the guide ring 31 have the eccentricity phenomenon is judged by monitoring the electric signal of the proximity switch 63 in real time, and when the abnormity is judged according to the detection signal, a user is timely reminded of carrying out abnormity processing. When the gap between the fan blade 2 and the guide ring 31 is detected to be smaller than 6mm, the risk that the fan blade 2 scrapes the guide ring 31 is indicated, the fan blade 2 and the guide ring 31 are eccentric, a maintenance warning is sent out through the controller, and the unit can continue to operate and shut down; when detecting that the clearance between the fan blade 2 and the guide ring 31 is smaller than 3mm, the controller controls the unit to stop and sends alarm information, which indicates that the fan blade 2 has the risk of scraping the guide ring 31 or has scraped the guide ring 31.
Further, motor 4 passes through mounting panel 5 and a supporting beam 7 to be fixed in backup pad 1, and motor 4 fixes on mounting panel 5, and the center department of mounting panel 5 sets up fixing base 51, and motor 4 passes through the mounting and installs on fixing base 51, and mounting panel 5 fixes on a supporting beam 7.
The number of the supporting beams 7 is two and the supporting beams are arranged in parallel, the supporting plate 1 is provided with a connecting rod 11, the end part of the supporting beam 7 is fixed on the connecting rod 11 through a fastening piece, and the other end of the supporting beam 7 is connected with the bracket 8 through a fastening piece.
When the fan blade 2 and the flow guide ring 31 are eccentric, the position of the fan blade 2 needs to be adjusted to make the fan blade 2 and the flow guide ring 31 coaxial, as shown in fig. 8, the fan assembly further comprises a fine adjustment structure for adjusting the position of the motor 4 to make the fan blade 2 and the flow guide ring 31 coaxial, the fine adjustment structure comprises first kidney-shaped holes 52 arranged at four corners of the mounting plate 5, a second fixing nut 72 suitable for matching with the first kidney-shaped holes 52 is arranged in the middle of the supporting beam 7, the distance between the mounting plate 5 and the supporting plate 1 is adjusted by adjusting the position of the fastening piece and the first kidney-shaped holes 52, and therefore the axial lead of the motor 4 is translated to make the fan blade 2 and the flow guide ring 31 coaxial.
Further, as shown in fig. 9, the fine adjustment structure further includes second kidney-shaped holes 71 disposed at two end portions of the support beam 7, fixing nuts used in cooperation with the second kidney-shaped holes 71 are disposed on the connecting rod 11 and the bracket 8, respectively, and the position of the axial line of the motor 4 along the direction of the connecting rod 11 is adjusted by adjusting the positions of the fastening member and the second kidney-shaped holes 71, so that the axial line of the motor 4 is translated to make the fan blade 2 and the baffle ring 31 coaxial.
The invention also provides a heat exchanger, which comprises a heat exchanger body and the fan assembly used for radiating heat for the heat exchanger body, wherein the fan assembly is the fan assembly.
A control method of a fan assembly mainly comprises the following steps:
and judging whether the fan blade 2 and the guide ring 31 have an eccentric phenomenon or not by detecting a signal of the gap detection device 6.
Further, the signal of the gap detection device 6 is detected within a certain time, the time interval between two detections is 20ms-30ms, and when an abnormal signal is detected, the judgment is delayed for a certain time, for example, the judgment is made after 2s-3 s.
Further, the control method also comprises an abnormal processing reminding step, when the gap detection device 6 detects that the distance from the fan blade 2 to the guide ring 31 is less than 6mm, the fan blade 2 is eccentric, the controller sends out maintenance warning information, and the unit continues to operate without stopping; when the gap detection device 6 detects that the distance from the fan blade 2 to the guide ring 31 is less than 3mm, the fan blade 2 is eccentric, the machine is stopped for protection, and the controller sends alarm information.
This fan assembly sets up clearance detection device 6 on roof 3 for survey the clearance between fan blade 2 and the water conservancy diversion circle 31, effectively avoid fan blade 2 to scrape water conservancy diversion circle 31, cause wearing and tearing to fan blade 2, extension equipment life guarantees the amount of wind simultaneously, improves the reliability of unit. This fan subassembly is adjusted the motor 4 position through setting up the fine setting structure, when clearance detection device 6 detects fan blade 2 and water conservancy diversion circle 31 off-centre, carries out two-dimentional regulation in the plane to motor 4 through the fine setting structure, promotes system's adjustability. The control method is simple and convenient, and can monitor the eccentricity of the fan blade 2 and the guide ring 31 in real time through the gap detection device 6, so as to early find early prevention.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (11)
1. A fan assembly comprises fan blades (2) and a top plate (3), wherein the fan blades (2) are driven to rotate by a motor (4), the top plate (3) is arranged above the fan blades (2), a flow guide ring (31) is arranged on the bottom surface of the top plate (3), and the flow guide ring (31) and the fan blades (2) are coaxially arranged, the fan assembly is characterized by further comprising a gap detection device (6) for detecting a gap between the fan blades (2) and the flow guide ring (31), whether the fan blades (2) and the flow guide ring (31) are eccentric or not is judged by detecting the gap detection device (6), the gap detection device (6) is fixed on the top plate (3) outside the flow guide ring (31), the gap detection device (6) comprises a main support frame (61), the main support frame (61) is inverted L-shaped, an auxiliary support frame (62) is arranged at the bottom end of the main support frame (61), and a distance sensor is, the number of the auxiliary supporting frames (62) is two, the auxiliary supporting frames (62) are bent and formed relative to the main supporting frame (61), the auxiliary supporting frames (62) and the main supporting frame (61) are of a bent structure facing the fan blades (2), and distance sensors for measuring different gap distances are arranged on the two auxiliary supporting frames (62) respectively.
2. The fan assembly according to claim 1, wherein the distance sensor is a proximity switch (63), a detection end of the proximity switch (63) is arranged towards the fan blade (2), and the proximity switch (63) is electrically connected with the controller.
3. The fan assembly according to claim 2, wherein the proximity switches (63) are respectively fixed to the sub-support frames (62) by nuts.
4. The fan assembly according to claim 1, characterized in that a wire fixing hook (64) is arranged on the main support frame (61) far away from the fan blade (2), and when the proximity switch (63) is fixed on the auxiliary support frame (62), a connecting wire is fixed on the wire fixing hook (64).
5. The fan assembly according to claim 1, wherein the motor (4) is fixed on the support plate (1) through a mounting plate (5) and a support beam (7), the motor (4) is fixed on the mounting plate (5), the mounting plate (5) is fixed on the support beam (7), the support beams (7) are two and parallel to each other, a connecting rod (11) is arranged on the support plate (1), the end part of the support beam (7) is fixed on the connecting rod (11) through a fastener, and the other end of the support beam (7) is connected with the bracket (8) through a fastener.
6. The fan assembly according to claim 5, further comprising a fine adjustment structure, wherein the fine adjustment structure comprises first waist-shaped holes (52) formed in four corners of the mounting plate (5), a second fixing nut (72) matched with the first waist-shaped holes (52) and suitable for use is arranged in the middle of the supporting beam (7), and the fan blade (2) and the flow guide ring (31) are coaxial by adjusting the position of the fastening piece and the first waist-shaped holes (52) to adjust the distance between the mounting plate (5) and the supporting plate (1).
7. The fan assembly according to claim 6, wherein the fine adjustment structure further comprises second waist-shaped holes (71) formed in two end portions of the support beam (7), fixing nuts used in cooperation with the second waist-shaped holes (71) are respectively arranged on the connecting rod (11) and the bracket (8), and the position of the axial line of the motor (4) along the direction of the connecting rod (11) is adjusted by adjusting the positions of the fastening piece and the second waist-shaped holes (71), so that the fan blade (2) and the flow guide ring (31) are coaxial.
8. A heat exchanger comprising a heat exchanger body and a fan assembly for dissipating heat from the heat exchanger body, wherein the fan assembly is as claimed in any one of claims 1 to 7.
9. A method of controlling a fan assembly according to any of claims 1 to 7, comprising the steps of:
whether the fan blade (2) and the guide ring (31) have an eccentric phenomenon is judged by detecting a signal of the gap detection device (6), the signal of the gap detection device (6) is detected within a certain time, and when an abnormal signal is detected, the abnormal judgment is postponed for a period of time.
10. The control method of the fan assembly according to claim 9, wherein the detection time interval between two adjacent gap detection devices is 20ms-30ms, and when the abnormal signal is detected, the abnormal determination is made after delaying for 2s-3 s.
11. The control method of the fan assembly according to claim 9, wherein when the gap detection device (6) detects that the distance from the fan blade (2) to the guide ring (31) is less than 6mm, the fan blade (2) is eccentric, the controller sends out a maintenance warning message, and the unit continues to operate without stopping; when the gap detection device (6) detects that the distance from the fan blade (2) to the guide ring (31) is less than 3mm, the fan blade (2) is eccentric, the unit is shut down for protection, and the controller sends alarm information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910850561.3A CN110630550B (en) | 2019-09-10 | 2019-09-10 | Fan assembly, heat exchanger and control method of heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910850561.3A CN110630550B (en) | 2019-09-10 | 2019-09-10 | Fan assembly, heat exchanger and control method of heat exchanger |
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| Publication Number | Publication Date |
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| CN110630550A CN110630550A (en) | 2019-12-31 |
| CN110630550B true CN110630550B (en) | 2020-12-01 |
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| CN201910850561.3A Active CN110630550B (en) | 2019-09-10 | 2019-09-10 | Fan assembly, heat exchanger and control method of heat exchanger |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113891622B (en) * | 2021-09-28 | 2022-11-01 | 珠海格力电器股份有限公司 | Air outlet device, control method and air conditioner |
| CN114233690A (en) * | 2021-12-20 | 2022-03-25 | 珠海格力电器股份有限公司 | Fan installation assembly, centrifugal fan assembly and machine room air conditioner |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105003452A (en) * | 2014-04-21 | 2015-10-28 | 中国石油化工股份有限公司 | Fan protection device of mechanical ventilation cooling tower |
| CN105841253A (en) * | 2016-05-13 | 2016-08-10 | 珠海格力电器股份有限公司 | Outdoor unit and air-conditioner having such outdoor unit |
| CN205744516U (en) * | 2016-05-06 | 2016-11-30 | 广西柳工机械股份有限公司 | Fan motor erection support adjusting apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130073172A1 (en) * | 2011-09-15 | 2013-03-21 | Bret Dwayne Worden | Detection system and method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105003452A (en) * | 2014-04-21 | 2015-10-28 | 中国石油化工股份有限公司 | Fan protection device of mechanical ventilation cooling tower |
| CN205744516U (en) * | 2016-05-06 | 2016-11-30 | 广西柳工机械股份有限公司 | Fan motor erection support adjusting apparatus |
| CN105841253A (en) * | 2016-05-13 | 2016-08-10 | 珠海格力电器股份有限公司 | Outdoor unit and air-conditioner having such outdoor unit |
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