CN111510012A - Three-phase four-bridge-arm inverter based on repetitive controller and PI (proportional-integral) double closed-loop control - Google Patents
Three-phase four-bridge-arm inverter based on repetitive controller and PI (proportional-integral) double closed-loop control Download PDFInfo
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- CN111510012A CN111510012A CN202010343577.8A CN202010343577A CN111510012A CN 111510012 A CN111510012 A CN 111510012A CN 202010343577 A CN202010343577 A CN 202010343577A CN 111510012 A CN111510012 A CN 111510012A
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- board
- inverter
- heat dissipation
- inverter body
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
- H05K7/20918—Forced ventilation, e.g. on heat dissipaters coupled to components the components being isolated from air flow, e.g. hollow heat sinks, wind tunnels or funnels
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The invention belongs to the technical field of power equipment, and particularly relates to a three-phase four-leg inverter based on a repetitive controller and PI (proportional integral) double closed-loop control, which comprises an inverter body and side fixing plates arranged on two sides of the inverter body, wherein openable heat dissipation windows are arranged on two sides of the inverter body, a plurality of louver boards which are arranged in parallel are arranged on the openable heat dissipation windows, and two adjacent louver boards are connected in a sealing manner; thereby drive the shutter plate and rotate, make the mutual block of bulge, depressed groove between the shutter plate sealed to with the heat dissipation window position that can open and shut of inverter body sealed, reduce the way that the air entered into the inverter body, the dehumidification heat dissipation window that sets up on the side-fixing board, set up the dehumidification broken line board that can block aqueous vapor in the dehumidification heat dissipation window, and the inside heat dissipation fan of cooperation, the invasion of reduction humid gas that can be by a wide margin, thereby reduce the probability of inside electronic component device damage.
Description
Technical Field
The invention belongs to the technical field of power equipment, and particularly relates to a three-phase four-leg inverter based on a repetitive controller and PI (proportional integral) double closed-loop control.
Background
The inverter converts the DC electric energy into AC electric energy, it is composed of inverter bridge, control logic and filter circuit, it is widely used in air conditioner, home theater, electric grinding wheel, electric tool, sewing machine, DVD, VCD, computer, TV, washing machine, kitchen ventilator, refrigerator, video recorder, massager, fan, lighting, the inverter can be used to connect the storage battery to drive the electric appliance and various tools to work in foreign countries due to the higher popularity of the automobile, the vehicle-mounted inversion output by the cigarette lighter is 20W, 40W, 80W, 120W to 150W power specification, then more power inversion power source is connected to the storage battery through connecting wire, the household electric appliance is connected to the output end of the power converter, the converter converts the AC voltage of the electric network into stable 12V DC output, and the inverter converts the 12V DC voltage output by the Adapter into high-frequency AC electric energy, both parts also employ a relatively large number of pulse width modulation techniques.
The existing power inverter needs to be provided with a ventilating heat dissipation window due to self heating, but the existing power inverter is usually used outdoors, the outdoor air environment can change according to weather, when air is humid, the air enters the inverter through the heat dissipation window, electronic components inside the inverter are affected with damp, and therefore the inverter capable of adjusting the size of the heat dissipation window according to the environment is urgently needed.
Disclosure of Invention
To solve the problems set forth in the background art described above. The invention provides a three-phase four-bridge-arm inverter based on a repetitive controller and PI double closed-loop control, which has the characteristic of being capable of adjusting a heat dissipation window according to the environment.
In order to achieve the purpose, the invention provides the following technical scheme: a three-phase four-leg inverter based on a repetitive controller and PI double closed-loop control comprises an inverter body and side fixing plates arranged on two sides of the inverter body, wherein openable heat dissipation windows are arranged on two sides of the inverter body, a plurality of louver boards which are arranged in parallel are arranged on the openable heat dissipation windows, two adjacent louver boards are connected in a sealing manner, the louver boards are rotatably connected with the inverter body through rotating shafts, a telescopic motor used for driving the louver boards to rotate is installed inside the inverter body and fixedly connected with the inverter body, the telescopic motor is electrically connected with an external power supply, a moisture removal baffle board is arranged on the inner side wall of each side fixing plate corresponding to the moisture removal heat dissipation window, the moisture removal baffle board is fixedly connected with the side fixing plates, and a heat dissipation fan facing the moisture removal baffle board is arranged inside the inverter body, the heat dissipation fan is electrically connected with an external power supply.
Preferably, the output end of the telescopic motor is fixedly connected with a rack, the rotating shaft of the louver board is fixedly connected with a gear, and the gear is in meshing transmission with the rack.
Preferably, the inside of the inverter body is provided with a sliding groove matched with the rack, and the rack is slidably mounted in the sliding groove.
Preferably, a humidity sensor is arranged on the outer side wall of the inverter body and electrically connected with the telescopic motor.
Preferably, a concave groove is formed in one side of each louver board, a protruding portion is fixedly arranged on the other side of each louver board, and every two adjacent louver boards are connected through the protruding portions and the concave grooves in a sealing mode.
Preferably, remove damp broken line board and include first broken line board and second broken line board, first broken line board is "W" shape, the second broken line board is "Z" shape.
Preferably, the first folding plate is provided with a first convex part and a first concave part which are distributed at intervals.
Preferably, the second patch board is provided with a second convex part and a second concave part which are distributed at intervals.
Preferably, first bulge, first depressed part on the first wiring board with second bulge, second depressed part on the second wiring board cooperate each other, so that form the air current passageway of buckling between first wiring board, the second wiring board.
Preferably, the two ends of the inverter body are provided with mounting foot seats, the mounting foot seats are fixedly connected with the inverter body, the side fixing plate is provided with a socket and a display, and the socket and the display are fixedly connected with the side fixing plate.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the openable louver boards are arranged on the inverter body, when the humidity sensor detects that the humidity of the environment is larger, signals are transmitted to the telescopic motor, the telescopic motor pulls the rack to move, so that the louver boards are driven to rotate, the convex parts and the concave grooves between the louver boards are mutually clamped and sealed, so that the openable heat dissipation window part of the inverter body is sealed, the path of air entering the inverter body is reduced, the moisture removal heat dissipation window arranged on the side fixing plate is provided with the moisture removal wire folding board capable of blocking moisture, and the moisture removal wire folding board is matched with the internal heat dissipation fan, so that the invasion of moist air can be greatly reduced, and the probability of damage of internal electronic element devices is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the moisture removing baffle of the present invention;
FIG. 3 is a schematic perspective view of the moisture removing and folding line plate of the present invention;
FIG. 4 is a schematic view of the structure of the blind slats of the present invention.
In the figure: 1. an inverter body; 101. the heat dissipation window can be opened and closed; 11. mounting a foot seat; 2. a side fixing plate; 201. a moisture removal and heat dissipation window; 21. a socket; 22. a display; 3. a heat dissipation fan; 4. a moisture removal line folding plate; 41. a first wire folding plate; 411. a first projecting portion; 412. a first recess; 42. a second wire folding plate; 421. a second projection; 422. a second recess; 5. a louver board; 51. a projection; 52. a recessed groove; 53. a gear; 6. a telescopic motor; 61. a rack; 8. a humidity sensor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides the following technical solutions: a three-phase four-leg inverter based on a repetitive controller and PI double closed-loop control comprises an inverter body 1 and side fixing plates 2 arranged on two sides of the inverter body 1, openable heat dissipation windows 101 are arranged on two sides of the inverter body 1, a plurality of louver boards 5 arranged in parallel are arranged on the openable heat dissipation windows 101, two adjacent louver boards 5 are connected in a sealing manner, the louver boards 5 are rotatably connected with the inverter body 1 through rotating shafts, a telescopic motor 6 used for driving the louver boards 5 to rotate is arranged inside the inverter body 1, the telescopic motor 6 is fixedly connected with the inverter body 1, the telescopic motor 6 is electrically connected with an external power supply, a moisture removal louver board 4 is arranged on the inner side wall of the side fixing plate 2 corresponding to the moisture removal heat dissipation window 201, the moisture removal louver board 4 is fixedly connected with the side fixing plate 2, a heat dissipation fan 3 facing the moisture removal louver board 4 is arranged inside the inverter body 1, the heat dissipation fan 3 is electrically connected with an external power supply.
In this embodiment, a plurality of louvers 5 arranged in parallel are disposed on the openable/closable heat dissipating window 101, two adjacent louvers 5 are hermetically connected, the louvers 5 are rotatably connected to the inverter body 1 through a rotating shaft, a telescopic motor 6 for driving the louvers 5 to rotate is disposed inside the inverter body 1, the openable/closable louvers 5 are disposed on the inverter body 1, wherein the louvers 5 are driven to rotate by the telescopic motor 6, the telescopic motor 6 is electrically connected to the humidity sensor 8, when the humidity sensor 8 detects a large humidity of the environment, a signal is transmitted to the telescopic motor 6, the telescopic motor 6 pulls the rack 61 to move, thereby driving the louvers 5 to rotate, and the protrusion 51 and the groove 52 between the louvers 5 are engaged with each other for sealing, thereby sealing the position of the openable/closable heat dissipating window 101 of the inverter body 1, and reducing the air entering into the inverter body 1, the moisture removal heat dissipation window 201 that sets up on the side fixing plate 2, set up in the moisture removal heat dissipation window 201 and can block the moisture remove line folding board 4 to the inside heat dissipation fan 3 of cooperation, the invasion of reduction humid gas that can be by a wide margin, thereby reduce the probability of inside electronic component device damage.
Specifically, a rack 61 is fixedly connected to an output end of the telescopic motor 6, a gear 53 is fixedly connected to a rotating shaft of the louver board 5, the gear 53 is meshed with the rack 61 for transmission, a chute matched with the rack 61 is formed inside the inverter body 1, the rack 61 is slidably installed in the chute, a humidity sensor 8 is arranged on an outer side wall of the inverter body 1, the humidity sensor 8 is electrically connected with the telescopic motor 6, a concave groove 52 is formed in one side of the louver board 5, a convex part 51 is fixedly arranged on the other side of the louver board 5, two adjacent louver boards 5 are hermetically connected through the convex part 51 and the concave groove 52, the telescopic motor 6 is arranged, the louver board 5 is driven by the telescopic motor 6 to rotate, the telescopic motor 6 is electrically connected with the humidity sensor 8, when the humidity sensor 8 detects that the humidity of the environment is larger, a signal is transmitted to the telescopic motor 6, and, thereby driving the louvers 5 to rotate, and the protrusion 51 and the concave groove 52 between the louvers 5 are mutually clamped and sealed, thereby sealing the openable and closable heat dissipation window 101 of the inverter body 1 and reducing the path of air entering the inverter body 1.
Specifically, the dehumidifying folding plate 4 comprises a first folding plate 41 and a second folding plate 42, the first folding plate 41 is in a W shape, the second folding plate 42 is in a Z shape, the first folding plate 41 is provided with a first convex part 411 and a first concave part 412, the first convex part 411 and the first concave part 412 are distributed at intervals, the second folding plate 42 is provided with a second convex part 421 and a second concave part 422, the second convex part 421 and the second concave part 422 are distributed at intervals, the first convex part 411 and the first concave part 412 on the first folding plate 41 are matched with the second convex part 421 and the second concave part 422 on the second folding plate 42, so that a bent air flow passage is formed between the first folding plate 41 and the second folding plate 42, the dehumidifying folding plate 4 consisting of the first folding plate 41 and the second folding plate 42 is provided with the bent air flow passage between the first folding plate 41 and the second folding plate 42, when the air current enters, the air current can be blocked by the bent moisture removal baffle plate 4, and the entering of moisture is reduced.
Specifically, the two ends of the inverter body 1 are provided with the mounting foot seats 11, the mounting foot seats 11 are fixedly connected with the inverter body 1, the side fixing plate 2 is provided with the socket 21 and the display 22, the socket 21 and the display 22 are both fixedly connected with the side fixing plate 2, the inverter body 1 is conveniently mounted and fixed by arranging the mounting foot seats 11, and the mounting foot seats 21 and the display 22 can be used for external power supply and display.
The working principle and the using process of the invention are as follows: after the invention is installed, the shutter plates 5 which can be opened and closed are arranged on the inverter body 1, wherein the shutter plates 5 are driven by the telescopic motor 6 to rotate, the telescopic motor 6 is electrically connected with the humidity sensor 8, when the humidity sensor 8 detects that the humidity of the environment is larger, the signal is transmitted to the telescopic motor 6, at the moment, the telescopic motor 6 pulls the rack 61 to move, thereby driving the louver boards 5 to rotate, so that the convex parts 51 and the concave grooves 52 between the louver boards 5 are mutually clamped and sealed, thereby sealing the openable heat dissipation window 101 of the inverter body 1, reducing the path of air entering the inverter body 1, arranging the moisture removal heat dissipation window 201 on the side fixing plate 2, arranging the moisture removal baffle plate 4 capable of blocking moisture in the moisture removal heat dissipation window 201, and matching with the internal heat dissipation fan 3, the invasion of the humid gas can be greatly reduced, thereby reducing the probability of damaging the internal electronic components.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. Three-phase four-leg inverter based on repetitive controller and PI double closed-loop control, comprising an inverter body (1) and side fixing plates (2) arranged at two sides of the inverter body (1), and is characterized in that: the both sides of the inverter body (1) all are equipped with openable heat dissipation window (101), be equipped with a plurality of parallel louver board (5) of arranging on openable heat dissipation window (101), adjacent two sealing connection between louver board (5), louver board (5) pass through the pivot with the inverter body (1) rotates to be connected, the internally mounted of inverter body (1) is used for driving louver board (5) pivoted flexible motor (6), flexible motor (6) with inverter body (1) fixed connection, flexible motor (6) and external power source electric connection, it is equipped with except that tide book line board (4) to correspond on the inside wall of side fixing plate (2) except that tide book window (201) department, it with side fixing plate (2) fixed connection to remove tide book board (4), the inside of inverter body (1) is equipped with towards remove heat dissipation fan (3) of tide book board (4), the heat dissipation fan (3) is electrically connected with an external power supply.
2. The three-phase four-leg inverter based on the repetitive controller and the PI double closed-loop control as claimed in claim 1, wherein: the output end of the telescopic motor (6) is fixedly connected with a rack (61), the rotating shaft of the louver board (5) is fixedly connected with a gear (53), and the gear (53) is meshed with the rack (61) for transmission.
3. The three-phase four-leg inverter based on the repetitive controller and the PI double closed-loop control as claimed in claim 2, wherein: the inverter body (1) is internally provided with a sliding groove matched with a rack (61), and the rack (61) is slidably arranged in the sliding groove.
4. The three-phase four-leg inverter based on the repetitive controller and the PI double closed-loop control as claimed in claim 3, wherein: be equipped with humidity transducer (8) on the lateral wall of inverter body (1), humidity transducer (8) with flexible motor (6) electric connection.
5. The three-phase four-leg inverter based on the repetitive controller and the PI double closed-loop control as claimed in claim 1, wherein: a concave groove (52) is formed in one side of each louver board (5), a protruding portion (51) is fixedly arranged on the other side of each louver board, and the adjacent louver boards (5) are connected in a sealing mode through the protruding portions (51) and the concave grooves (52).
6. The three-phase four-leg inverter based on the repetitive controller and the PI double closed-loop control as claimed in claim 1, wherein: remove tide book board (4) and include first book board (41) and second book board (42), first book board (41) are "W" shape, second book board (42) are "Z" shape.
7. The three-phase four-leg inverter based on the repetitive controller and the PI double closed-loop control as claimed in claim 6, wherein: the first folding plate (41) is provided with a first protruding part (411) and a first concave part (412), and the first protruding part (411) and the first concave part (412) are distributed at intervals.
8. The three-phase four-leg inverter based on the repetitive controller and the PI double closed-loop control as claimed in claim 7, wherein: the second line folding plate (42) is provided with a second convex part (421) and a second concave part (422), and the second convex part (421) and the second concave part (422) are distributed at intervals.
9. The three-phase four-leg inverter based on the repetitive controller and the PI double closed-loop control as claimed in claim 8, wherein: first bulge (411), first depressed part (412) on first wiring board (41) with second bulge (421), second depressed part (422) on second wiring board (42) mutually support, so that form the air current passageway of buckling between first wiring board (41), second wiring board (42).
10. The three-phase four-leg inverter based on the repetitive controller and the PI double closed-loop control as claimed in claim 1, wherein: the utility model discloses an inverter, including inverter body (1), side fixed plate (2), both ends of inverter body (1) are equipped with installation foot seat (11), installation foot seat (11) with inverter body (1) fixed connection, be equipped with socket (21), display (22) on side fixed plate (2), socket (21), display (22) all with side fixed plate (2) fixed connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010343577.8A CN111510012A (en) | 2020-04-27 | 2020-04-27 | Three-phase four-bridge-arm inverter based on repetitive controller and PI (proportional-integral) double closed-loop control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010343577.8A CN111510012A (en) | 2020-04-27 | 2020-04-27 | Three-phase four-bridge-arm inverter based on repetitive controller and PI (proportional-integral) double closed-loop control |
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| Publication Number | Publication Date |
|---|---|
| CN111510012A true CN111510012A (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010343577.8A Pending CN111510012A (en) | 2020-04-27 | 2020-04-27 | Three-phase four-bridge-arm inverter based on repetitive controller and PI (proportional-integral) double closed-loop control |
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| CN (1) | CN111510012A (en) |
Citations (13)
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| CN201763187U (en) * | 2010-06-25 | 2011-03-16 | 浙江浙风机电设备有限公司 | Rainproof ventilation louver |
| CN202300087U (en) * | 2011-10-20 | 2012-07-04 | 宁波凯荣船用机械有限公司 | Ridge-type blind window |
| US20120168145A1 (en) * | 2010-12-31 | 2012-07-05 | Microsoft Corporation | Deicing louvers for datacenter applications |
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| CN103850603A (en) * | 2012-11-29 | 2014-06-11 | 上海电气集团上海电机厂有限公司 | Shutters for motor |
| CN203851006U (en) * | 2014-05-12 | 2014-09-24 | 合肥正源微电子有限公司 | Switch power supply cabinet with rotary shutter |
| CN105337192A (en) * | 2015-11-25 | 2016-02-17 | 国家电网公司 | Ventilated moistureproof switch cabinet |
| CN206319806U (en) * | 2016-12-26 | 2017-07-11 | 绍兴市鼎赞环保科技有限公司 | Shutter |
| CN107394896A (en) * | 2017-08-21 | 2017-11-24 | 江苏伊顿电气科技有限公司 | One kind automation power distribution cabinet examination and repair system |
| CN207485297U (en) * | 2017-11-07 | 2018-06-12 | 天津中建杰高科技开发有限公司 | A kind of shutter with oscillating function |
| CN208955477U (en) * | 2018-11-27 | 2019-06-07 | 衡水伟源电气设备有限公司 | A kind of construction site construction heat sinking distribution box |
| CN209215970U (en) * | 2019-01-15 | 2019-08-06 | 石狮市瑞力机械科技有限公司 | A kind of intelligent control type constant temperature and humidity frequency-charger cabinet |
| KR20190133084A (en) * | 2018-05-21 | 2019-12-02 | 임태규 | Automatic open and close system of louver |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201763187U (en) * | 2010-06-25 | 2011-03-16 | 浙江浙风机电设备有限公司 | Rainproof ventilation louver |
| US20120168145A1 (en) * | 2010-12-31 | 2012-07-05 | Microsoft Corporation | Deicing louvers for datacenter applications |
| CN202300087U (en) * | 2011-10-20 | 2012-07-04 | 宁波凯荣船用机械有限公司 | Ridge-type blind window |
| CN103850603A (en) * | 2012-11-29 | 2014-06-11 | 上海电气集团上海电机厂有限公司 | Shutters for motor |
| CN203430356U (en) * | 2013-08-14 | 2014-02-12 | 龙岩市海德馨汽车有限公司 | All-day moisture separation air inlet device of power van |
| CN203851006U (en) * | 2014-05-12 | 2014-09-24 | 合肥正源微电子有限公司 | Switch power supply cabinet with rotary shutter |
| CN105337192A (en) * | 2015-11-25 | 2016-02-17 | 国家电网公司 | Ventilated moistureproof switch cabinet |
| CN206319806U (en) * | 2016-12-26 | 2017-07-11 | 绍兴市鼎赞环保科技有限公司 | Shutter |
| CN107394896A (en) * | 2017-08-21 | 2017-11-24 | 江苏伊顿电气科技有限公司 | One kind automation power distribution cabinet examination and repair system |
| CN207485297U (en) * | 2017-11-07 | 2018-06-12 | 天津中建杰高科技开发有限公司 | A kind of shutter with oscillating function |
| KR20190133084A (en) * | 2018-05-21 | 2019-12-02 | 임태규 | Automatic open and close system of louver |
| CN208955477U (en) * | 2018-11-27 | 2019-06-07 | 衡水伟源电气设备有限公司 | A kind of construction site construction heat sinking distribution box |
| CN209215970U (en) * | 2019-01-15 | 2019-08-06 | 石狮市瑞力机械科技有限公司 | A kind of intelligent control type constant temperature and humidity frequency-charger cabinet |
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Application publication date: 20200807 |