CN109217638B - Multifunctional outer cover for frequency converter and frequency converter - Google Patents
Multifunctional outer cover for frequency converter and frequency converter Download PDFInfo
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- CN109217638B CN109217638B CN201811120974.8A CN201811120974A CN109217638B CN 109217638 B CN109217638 B CN 109217638B CN 201811120974 A CN201811120974 A CN 201811120974A CN 109217638 B CN109217638 B CN 109217638B
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- frequency converter
- protective cover
- plate
- heat dissipation
- fixed
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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
- H02M1/00—Details of apparatus for conversion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
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- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Thermal Sciences (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a multifunctional outer cover for a frequency converter and the frequency converter, and relates to the field of frequency converter work. The invention comprises a bottom plate, wherein a damping mechanism is fixed on the bottom plate, and a supporting plate is arranged at the upper end of the damping mechanism. The damping mechanism comprises a first damping spring, a lower pressing plate and a lower pressing rod; the supporting plate is provided with a T-shaped groove and a threaded through hole, the supporting plate is provided with a protective cover, a fixing mechanism is arranged in the protective cover, and the fixing mechanism comprises a compression spring and a baffle. Open on the safety cover lateral wall has the rectangular channel, all is equipped with the metal sheet in the rectangular channel. The side end of the bottom of the protective cover is provided with a limiting mechanism, the limiting mechanism and the side end of the top of the protective cover is provided with a heat dissipation mechanism. The frequency converter can be fixed when running, the generated vibration effect can be effectively slowed down, and heat generated when the frequency converter runs can be discharged; in addition, the metal plate capable of being opened and closed can effectively prevent electromagnetic wave interference, prevent faults from being generated when the frequency converter works, and facilitate opening and closing and timely checking and maintaining.
Description
Technical Field
The invention relates to the field of working of frequency converters, in particular to a multifunctional outer cover for a frequency converter and the frequency converter.
Background
The frequency converter is an electric control device which applies a frequency conversion technology and a microelectronic technology and controls an alternating current motor by changing the frequency mode of a working power supply of the motor. Many factors need be paid attention to when the converter is used, and physical environment is like operating temperature and ambient temperature, and electrical environment is like electromagnetic interference etc. still must consider the vibrations effect that converter self during operation produced simultaneously.
In the prior art, the skilled person can completely control the above factors, but cannot perfectly integrate them together to make them function at the same time, for example, the heat dissipation device can not resist electromagnetic wave interference while dissipating heat; the damping mechanism cannot dissipate heat while absorbing shock. Based on the background technology, a multifunctional outer cover for a frequency converter and the frequency converter are provided.
Disclosure of Invention
The invention aims to provide a multifunctional outer cover for a frequency converter and the frequency converter, wherein the multifunctional outer cover is provided with a heat dissipation mechanism, a damping mechanism and a fixing mechanism, the frequency converter can be fixed when in operation, the generated vibration effect can be effectively slowed down, and heat generated when the frequency converter is in operation can be timely discharged; in addition, the metal plate which can be opened and closed is plated with tin or nickel, so that electromagnetic wave interference can be effectively prevented, faults are prevented from occurring when the frequency converter works, and opening and closing are convenient to check and maintain in time.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a multi-functional dustcoat is used to converter, includes the bottom plate, the bottom plate intermediate position is opened has first wiring hole, is fixed with array distribution's damper on the bottom plate, and the damper upper end is equipped with the backup pad.
The damping mechanism comprises a sleeve welded and fixed on the bottom plate, a first damping spring is fixed inside the sleeve, a lower pressing plate is fixed at the top of the first damping spring, a lower pressing rod is arranged at the top of the lower pressing plate, and the lower pressing rod penetrates through the top of the sleeve in a movable mode.
A second wiring hole is formed in the middle of the supporting plate, and T-shaped grooves distributed in parallel and threaded through holes distributed in an array are formed in the supporting plate.
Be equipped with the safety cover in the backup pad, be equipped with fixed establishment in the safety cover, fixed establishment includes compression spring, and compression spring one end is fixed on one side lateral wall in the safety cover, and the compression spring other end is fixed with the baffle, and the baffle bottom is equipped with T type piece, and T type piece slides and sets up at T type inslot, fixed establishment symmetry is provided with two, fixes respectively on the inside opposite lateral wall of safety cover.
Open on the safety cover lateral wall has the rectangular channel, and the spacing hole that has symmetric distribution is opened to rectangular channel top side, all is equipped with the metal sheet in the rectangular channel, and the metal sheet mirror image is provided with two.
All be equipped with the stop gear of symmetric distribution on the safety cover bottom side, stop gear includes two stoppers of parallel distribution, runs through between the stopper to be provided with the dwang.
The heat dissipation mechanism is arranged at the side end of the top of the protection cover and comprises a heat dissipation plate which is movably arranged at the side end of the protection cover in a sealing mode, heat dissipation holes which are distributed in parallel are formed in the heat dissipation plate, rotating shafts are arranged in the heat dissipation holes, and heat dissipation fan blades which are distributed in an array mode are arranged on the rotating shafts.
The lower pressing rod is provided with a second damping spring, the second damping spring is arranged around the lower pressing rod, the bottom of the second damping spring is welded to the top of the sleeve, and the top of the second damping spring is welded to the bottom of the supporting plate.
The dwang rotation is fixed between two stoppers, and the stopper outside end is equipped with the second fastening bolt of symmetric distribution, and second fastening bolt runs through the stopper, and the block is fixed with L type card strip on the dwang.
Furthermore, the bottom of the protective cover is provided with folded edges distributed in an array mode, the folded edges are provided with first fastening bolts, and the first fastening bolts are connected with the threaded through holes in a matched mode.
Furthermore, the side ends of the top of the metal plate are provided with symmetrically distributed limiting rods, the bottom of the metal plate is provided with a rotating handle, and the limiting rods are movably arranged in the limiting holes.
The dwang rotation is fixed between two stoppers, and the stopper outside end is equipped with the second fastening bolt of symmetric distribution, and second fastening bolt runs through the stopper, and the block is fixed with L type card strip on the dwang.
Furthermore, the two sides of the heat dissipation plate are provided with symmetrically distributed clamping blocks, the side ends of the clamping blocks are provided with threaded through holes, and third fastening bolts are connected in the threaded through holes.
A frequency converter comprises the multifunctional outer cover, and is arranged in the protective cover.
The invention has the beneficial effects that:
1. the invention is provided with the heat dissipation mechanism, the damping mechanism and the fixing mechanism, the frequency converter can be fixed when running, the generated vibration effect can be effectively slowed down, and the heat generated when the frequency converter runs can be timely discharged;
2. the invention is provided with the metal plate which can be opened and closed, and the metal plate is plated with tin or nickel, thereby effectively preventing electromagnetic wave interference, simultaneously preventing faults from being generated when the frequency converter works, and facilitating the opening and closing to check and maintain in time;
3. the multifunctional outer cover designed by the invention has the advantages of simple structure, multiple functions of heat dissipation, shock absorption and the like, strong practicability and convenience for application and popularization of personnel in the field.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic front view of the damping mechanism of the present invention;
FIG. 3 is a schematic cross-sectional view of the damping mechanism of the present invention;
FIG. 4 is a schematic view of the shock absorbing mechanism and support plate configuration of the present invention;
FIG. 5 is a schematic view of the protective shield and internal structure of the present invention;
FIG. 6 is an enlarged schematic view of the securing mechanism of the present invention;
FIG. 7 is a schematic diagram of the structure of the metal plate of the present invention;
FIG. 8 is a schematic view of the protective cover of the present invention;
FIG. 9 is an enlarged schematic view of the spacing mechanism of the present invention;
fig. 10 is a schematic view of the heat dissipation mechanism of the present invention.
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.
In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
A multifunctional housing for a frequency converter is shown in figure 1 and comprises a bottom plate 1, wherein the bottom of the bottom plate 1 is grounded and used for preventing external interference. A first wiring hole 11 is formed in the middle of the bottom plate 1, the bottom plate 1 is fixedly provided with damping mechanisms 2 distributed in an array mode, and a supporting plate 3 is arranged at the upper end of each damping mechanism 2.
As shown in fig. 2 and 3, the damping mechanism 2 includes a sleeve 21 welded and fixed on the bottom plate 1, a first damping spring 22 is fixed inside the sleeve 21, a lower pressing plate 23 is fixed on the top of the first damping spring 22, a lower pressing rod 2301 is arranged on the top of the lower pressing plate 23, and the lower pressing rod 2301 movably penetrates through the top of the sleeve 21. The lower pressing rod 2301 is provided with a second damping spring 24, the second damping spring 24 is arranged around the lower pressing rod 2301, the bottom of the second damping spring 24 is welded to the top of the sleeve 21, and the top of the second damping spring 24 is welded to the bottom of the supporting plate 3. When there is a shock at the upper end of the supporting plate 3, the lower pressing plate 23 and the lower pressing bar 2301 move downward under the shock effect, and the first and second damping springs 22 and 24 are compressed, which may weaken the shock effect.
As shown in fig. 4, a second wiring hole 31 is formed in the middle of the supporting plate 3, and T-shaped grooves 32 distributed in parallel and threaded through holes 33 distributed in an array are formed in the supporting plate 3.
As shown in fig. 1 and 5, the supporting plate 3 is provided with a protective cover 4, the bottom of the protective cover 4 is provided with a folded edge 41 distributed in an array, the folded edge 41 is provided with a first fastening bolt 4101, and the first fastening bolt 4101 is matched and connected with the threaded through hole 33 to fix the protective cover 4 on the supporting plate 3. Be equipped with fixed establishment 5 in the safety cover 4, fixed establishment 5 includes hold-down spring 51, and hold-down spring 51 one end is fixed on the inside lateral wall of safety cover 4, and the hold-down spring 51 other end is fixed with baffle 52, and the baffle 52 bottom is equipped with T type piece 5201, and T type piece 5201 slides and sets up in T type groove 32, and baffle 52 can freely slide in T type groove 32 together with T type piece 5201. Two fixing mechanisms 5 are symmetrically arranged and are respectively fixed on opposite side walls in the protective cover 4. When the converter was placed in the middle of backup pad 3, fixed establishment 5 can be fixed with the converter, can reduce the vibrations effect of converter during operation to a certain extent.
As shown in fig. 5, a rectangular groove 42 is formed in the outer side wall of the protective cover 4, two limiting holes 4201 are formed in the top side end of the rectangular groove 42, as shown in fig. 1 and 7, metal plates 43 are disposed in the rectangular groove 42, two metal plates 43 are arranged in a mirror image manner, limiting rods 4301 are disposed in the top side end of each metal plate 43, the rotating handles 4302 are disposed at the bottom of the metal plates 43, the limiting rods 4301 are movably disposed in the limiting holes 4201, and the metal plates 43 can freely rotate around the limiting rods 4301 as a whole. The surface of the metal plate 43 is plated with nickel or tin, and when the metal plate 43 is closed, the interference of external electromagnetism to the frequency converter can be effectively weakened after the cable is grounded.
As shown in fig. 8, the metal plate 43 is vertical, the side end of the bottom of the protection cover 4 is provided with the limiting mechanism 44 with symmetrical distribution, the limiting mechanism 44 is located on two sides of the bottom of the metal plate 43, the limiting mechanism 44 comprises two limiting blocks 4401 with parallel distribution, a rotating rod 4402 is arranged between the limiting blocks 4401 in a penetrating manner, the rotating rod 4402 is fixed between the two limiting blocks 4401 in a rotating manner, the outer side end of each limiting block 4401 is provided with a second fastening bolt 4404 with symmetrical distribution, the second fastening bolt 4404 penetrates through the limiting blocks 4401, and the L-shaped clamping strip 4403 is fixed on the rotating rod 4402 in a clamping. When the metal plate 43 is closed as shown in fig. 8, the bottom end of the L-shaped locking strip 4403 is rotated to contact with the metal plate 43, then the second fastening bolt 4404 is tightened to fix the rotating rod 4402 between the two limiting blocks 4401, and when the frequency converter operates, one side end of the protection cover 4 is closed by the metal plate 43 to prevent external electromagnetic interference.
As shown in fig. 1 and 10, a heat dissipation mechanism 6 is disposed at a top side end of the protection cover 4, the heat dissipation mechanism 6 includes a heat dissipation plate 61 hermetically and movably disposed at the side end of the protection cover, heat dissipation holes 6101 are formed in the heat dissipation plate 61 and are distributed in parallel, a rotation shaft 62 is disposed in each heat dissipation hole 6101, a side end of the rotation shaft 62 is connected to a driving device such as a motor, and heat dissipation fan blades 6201 are disposed on the rotation shaft 62 and are distributed in an. The heat dissipation plate 61 is provided with symmetrically distributed clamping blocks 63 at two sides, threaded through holes are formed in the side ends of the clamping blocks 63, third fastening bolts 6301 are connected in the threaded through holes, when the third fastening bolts 6301 are arranged at positions shown in fig. 1, the heat dissipation mechanism 6 is fixed by the third fastening bolts 6301 and cannot move transversely, and when the third fastening bolts 6301 are screwed inwards, the heat dissipation mechanism 6 can be pulled out of the protection cover 4.
A frequency converter comprises the multifunctional outer cover for the frequency converter, and the frequency converter is arranged in a protective cover 4.
When the invention is used, firstly, the frequency converter and the protective cover 4 are placed on the support plate 3, the bottom of the frequency converter is fixed through the fixing mechanism 5, and the protective cover 4 is fixed on the support plate 3 by screwing the first fastening bolt 4101; the metal plate 43 is then closed by the stopper mechanism 44 to prevent electromagnetic interference from the outside. When the frequency converter operates, the damping mechanism 2 arranged at the bottom of the supporting plate 3 can weaken the vibration effect caused by the operation of the frequency converter, and meanwhile, a driving device such as a motor connected with the side end of the rotating shaft 62 is opened to discharge heat generated when the frequency converter operates. The metal plate 43 can be opened during working, so that faults are prevented from being generated during working of the frequency converter, and the frequency converter is convenient to check and maintain in time.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (5)
1. A multifunctional outer cover for a frequency converter comprises a bottom plate (1), and is characterized in that a first wiring hole (11) is formed in the middle of the bottom plate (1), damping mechanisms (2) distributed in an array mode are fixed on the bottom plate (1), and a supporting plate (3) is arranged at the upper end of each damping mechanism (2);
the damping mechanism (2) comprises a sleeve (21) welded and fixed on the bottom plate (1), a first damping spring (22) is fixed inside the sleeve (21), a lower pressing plate (23) is fixed on the top of the first damping spring (22), a lower pressing rod (2301) is arranged on the top of the lower pressing plate (23), and the lower pressing rod (2301) movably penetrates through the top of the sleeve (21);
a second wiring hole (31) is formed in the middle of the supporting plate (3), and T-shaped grooves (32) distributed in parallel and threaded through holes (33) distributed in an array are formed in the supporting plate (3);
the protective cover (4) is arranged on the supporting plate (3), the fixing mechanism (5) is arranged in the protective cover (4), the fixing mechanism (5) comprises a compression spring (51), one end of the compression spring (51) is fixed on the side wall of one side in the protective cover (4), the other end of the compression spring (51) is fixed with a baffle (52), a T-shaped block (5201) is arranged at the bottom end of the baffle (52), the T-shaped block (5201) is arranged in the T-shaped groove (32) in a sliding mode, and the two fixing mechanisms (5) are symmetrically arranged and fixed on opposite side walls in the protective cover (4) respectively;
the outer side wall of the protective cover (4) is provided with a rectangular groove (42), the side end of the top of the rectangular groove (42) is provided with symmetrically distributed limiting holes (4201), metal plates (43) are arranged in the rectangular groove (42), and two metal plates (43) are arranged in a mirror image manner;
the side ends of the bottom of the protective cover (4) are respectively provided with a limiting mechanism (44) which is symmetrically distributed, each limiting mechanism (44) comprises two limiting blocks (4401) which are distributed in parallel, and a rotating rod (4402) is arranged between the limiting blocks (4401) in a penetrating manner;
a heat dissipation mechanism (6) is arranged at the top side end of the protective cover (4), the heat dissipation mechanism (6) comprises a heat dissipation plate (61) which is movably arranged at the side end of the protective cover in a sealing mode, heat dissipation holes (6101) which are distributed in parallel are formed in the heat dissipation plate (61), rotating shafts (62) are arranged in the heat dissipation holes (6101), and heat dissipation fan blades (6201) which are distributed in an array mode are arranged on the rotating shafts (62);
a second damping spring (24) is arranged on the lower pressing rod (2301), the second damping spring (24) is arranged on the periphery of the lower pressing rod (2301), the bottom of the second damping spring (24) is welded to the top of the sleeve (21), and the top of the second damping spring (24) is welded to the bottom of the supporting plate (3);
dwang (4402) swivelling joint is between two stopper (4401), and stopper (4401) outside end is equipped with second fastening bolt (4404) of symmetric distribution, and stopper (4401) is run through in second fastening bolt (4404), and the block is fixed with L type card strip (4403) on dwang (4402).
2. The multifunctional housing for the frequency converter according to claim 1, wherein the protective cover (4) is provided with a plurality of folded edges (41) distributed in an array at the bottom, the folded edges (41) are provided with first fastening bolts (4101), and the first fastening bolts (4101) are matched and connected with the threaded through holes (33).
3. The multifunctional outer cover for the frequency converter according to claim 1, wherein the top side ends of the metal plates (43) are provided with symmetrically distributed limiting rods (4301), the bottom of the metal plates (43) is provided with a rotating handle (4302), and the limiting rods (4301) are movably arranged in limiting holes (4201).
4. The multifunctional housing for the frequency converter according to claim 1, wherein the heat dissipation plate (61) is provided with symmetrically distributed locking blocks (63) at both sides thereof, the side ends of the locking blocks (63) are provided with threaded through holes, and third fastening bolts (6301) are connected in the threaded through holes.
5. A frequency converter characterized in that it comprises a multi-functional housing for a frequency converter according to any of claims 1-4, which frequency converter is arranged inside the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811120974.8A CN109217638B (en) | 2018-09-25 | 2018-09-25 | Multifunctional outer cover for frequency converter and frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811120974.8A CN109217638B (en) | 2018-09-25 | 2018-09-25 | Multifunctional outer cover for frequency converter and frequency converter |
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| Publication Number | Publication Date |
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| CN109217638A CN109217638A (en) | 2019-01-15 |
| CN109217638B true CN109217638B (en) | 2020-01-03 |
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| CN201811120974.8A Active CN109217638B (en) | 2018-09-25 | 2018-09-25 | Multifunctional outer cover for frequency converter and frequency converter |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114125577A (en) * | 2020-08-28 | 2022-03-01 | 山东维创精密电子有限公司 | Novel industrial switch dislocation rack device |
| CN112739108A (en) * | 2020-12-28 | 2021-04-30 | 巢湖市金辉自控设备有限公司 | Wall-hanging converter auxiliary erection equipment |
| CN112737285B (en) * | 2020-12-30 | 2022-02-01 | 巢湖市金辉自控设备有限公司 | Protection device suitable for not unidimensional converter |
| CN113300575B (en) * | 2021-05-31 | 2021-12-31 | 深圳超能数通能源技术有限公司 | Current reconstruction over-modulation device of air conditioner frequency converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205834772U (en) * | 2015-09-10 | 2016-12-28 | 安徽霍山科皖特种铸造有限责任公司 | A kind of for processing the frock clamp rotating bar keyway |
| CN206900287U (en) * | 2017-05-09 | 2018-01-19 | 舞钢市保华科技有限公司 | A kind of on-vehicle night vision instrument mounting-fixing base |
| CN207557832U (en) * | 2017-10-30 | 2018-06-29 | 季丽红 | A kind of heat dissipation damping type hard disc of computer |
| CN207601700U (en) * | 2017-11-01 | 2018-07-10 | 天津宏泰电子科技有限公司 | A kind of computer cabinet with shock-absorbing function |
| CN207460670U (en) * | 2017-11-30 | 2018-06-05 | 新疆德创工控技术有限公司 | A kind of new electrical automation control cabinet |
| CN207796416U (en) * | 2017-12-26 | 2018-08-31 | 广州侨天智能科技有限公司 | A kind of building control cabinet mounting bracket being easily installed |
| CN207896431U (en) * | 2018-01-26 | 2018-09-21 | 广东晟开实业有限公司 | A kind of environment-friendly type frequency converter control cabinet |
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