CN113490389A - Energy-saving stepped heat dissipation unit special for frequency conversion and other electrical equipment and method thereof - Google Patents
Energy-saving stepped heat dissipation unit special for frequency conversion and other electrical equipment and method thereof Download PDFInfo
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- CN113490389A CN113490389A CN202011489581.1A CN202011489581A CN113490389A CN 113490389 A CN113490389 A CN 113490389A CN 202011489581 A CN202011489581 A CN 202011489581A CN 113490389 A CN113490389 A CN 113490389A
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000005057 refrigeration Methods 0.000 claims abstract description 19
- 239000000498 cooling water Substances 0.000 claims description 16
- 230000001681 protective effect Effects 0.000 claims description 8
- 238000007791 dehumidification Methods 0.000 claims description 5
- 230000007306 turnover Effects 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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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
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
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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
- H05K7/20936—Liquid coolant with phase change
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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
- H05K7/20945—Thermal management, e.g. inverter temperature control
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- Physics & Mathematics (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of energy-saving frequency conversion heat dissipation equipment, in particular to a special step heat dissipation unit for energy-saving frequency conversion and other electrical equipment and a method thereof. According to the cascade heat dissipation unit device, the air-water cooling heat exchange and the plurality of groups of compressor refrigeration modules are combined together, the running temperature, humidity and safe running requirements of equipment are met accurately in a most energy-saving mode, meanwhile, one-stop intelligent monitoring and management problems of an unattended power distribution room are achieved, the management cost is saved, comprehensive energy efficiency management of the power distribution room is achieved, energy consumption is saved, carbon emission is reduced, and safe and stable running of the equipment is achieved.
Description
Technical Field
The invention relates to the technical field of energy-saving variable-frequency heat dissipation equipment, in particular to a special energy-saving stepped heat dissipation unit for electrical equipment such as variable frequency equipment and a method thereof.
Background
With the development and progress of social science and technology, various high-voltage and low-voltage frequency converters are developed in order to meet the requirements of life and production, but in the process of using the frequency converters, the devices generate a large amount of heat, so that the heat dissipation device of the frequency converters is very important.
At present, electrical equipment heat dissipation such as high, low-voltage inverter generally adopts natural draft, air cooling system, the air-cooled air conditioning mode, natural draft can't change humidity, the dust, corrosive gas is to the influence of equipment, the unable accurate control humiture of air cooling, the cold energy consumption in water source is on the high side, holistic automation is low with intelligent degree, can't satisfy the environmental control demand of equipment, traditional cooling method needs a large amount of manpowers to maintain the operation of system simultaneously, lead to the operation cost of enterprise high, it is inconvenient to maintain work.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides an energy-saving stepped radiating unit special for electrical equipment such as frequency conversion equipment and a method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme: the energy-saving type stepped heat dissipation unit comprises a base, wherein a box body is fixedly mounted on the upper surface of the base, an axial flow fan is fixedly mounted on the outer surface of the box body, an air outlet is formed in the outer surface of the box body, an air outlet flange is fixedly mounted on one side, close to the air outlet, of the box body, a condensate water group is fixedly mounted on the inner wall of the box body, a heat exchanger is fixedly mounted on the inner wall, close to one end of the condensate water group, of the box body, an evaporator is fixedly mounted on the inner wall, close to one side of the air outlet flange, of the box body, and a water inlet and outlet interface is fixedly mounted on the inner wall, far away from one side of the evaporator, of the box body.
Preferably, the number of the heat exchangers is two, and the two groups of the heat exchangers are symmetrically distributed.
Preferably, a protective shell is fixedly mounted on one side, close to the axial flow fan, of the box body, and the axial flow fan is fixedly connected with the inner wall of the protective shell.
Preferably, a control box is fixedly installed on one side, far away from the air outlet, of the box body, and the air outlet flange is fixedly connected with the outer surface of the box body through bolts.
Preferably, the condensate water group is fixedly connected with the heat exchanger, and the evaporator is rectangular.
Preferably, the outer surface of the base is communicated with a drain pipe.
Preferably, the use method of the energy-saving frequency conversion and other electrical equipment dedicated cascade heat dissipation unit comprises the following steps:
s1, when the temperature of the cooling water is low and meets the heat dissipation requirement temperature of the electrical equipment, only operating the air-water cooling system;
s2, when the water temperature is high or the equipment load is large and can not meet the requirement of the equipment operation environment temperature, starting the number of the compressor modules for further refrigeration according to the requirement until the requirement that the equipment operation temperature reaches a set value is met;
and S3, when the indoor humidity is larger than the set value, starting the compressor dehumidification mode until the temperature and humidity curve between the electrical equipment is in the range of 3K 3.
Compared with the prior art, the invention has the advantages and positive effects that:
in the invention, the effect of hot air stepped cooling is realized by fully utilizing the stepped temperature rise of cooling water to take away heat, when the equipment is started, the cooling water firstly reduces the temperature of hot air to a range of 5 ℃ for heating water through the air-water cooling system heat exchanger, at the moment, the water temperature can rise by 2-3 ℃, the cooling water passes through condensers of a plurality of groups of compressor refrigerating modules, the water temperature can rise by 5 ℃ for taking away the heat of a refrigerant, the compressor refrigerating modules work to cool the hot air to a set temperature value, when the temperature of the cooling water is lower and meets the heat dissipation requirement temperature of electrical equipment, only the air-water cooling system is operated, when the temperature of the cooling water is higher or the load of the equipment is large and can not meet the temperature requirement of the running environment of the equipment, the number of the compressor modules is started to further refrigerate according to the requirement until the running temperature of the equipment reaches a set value, and when the indoor humidity is higher than the set value, the dehumidifying mode of the compressor is started, the unit is complete equipment or is centralized-controlled in a networking mode until the temperature and humidity curve between electrical equipment is within the range of 3K3, the unit can automatically run without being attended, remote monitoring and remote maintenance service are carried out by transmitting data through the Internet of things, the unit integrates two refrigeration running modes of air-water refrigeration and refrigeration of a plurality of groups of compressor modules, mode automatic switching and module switching quantity control under different water temperatures and loads are realized through fuzzy control logic, the cascade cooling function is realized to achieve the aim of energy-saving running, the air-water cooling heat exchange and the plurality of groups of compressor refrigeration modules are combined with each other through the cascade heat dissipation unit device, the running temperature, humidity and safe running requirements of the equipment are accurately met in a most energy-saving mode, and meanwhile, the integrated electrical room environment management and monitoring function is provided, and the one-station type intelligent monitoring and management problem of an unattended distribution room can be realized, the management cost is saved, comprehensive data of the power distribution room can be collected and analyzed through the internet of things technology, indoor temperature and humidity intelligent control and fresh air and return air intelligent distribution are adopted, comprehensive energy efficiency management of the power distribution room is achieved, energy consumption is saved, carbon emission is reduced, and safe and stable operation of equipment is achieved.
Drawings
Fig. 1 is a schematic front view of a stepped heat dissipation unit dedicated for energy-saving frequency conversion and other electrical devices and a method thereof according to the present invention;
fig. 2 is a schematic cross-sectional structural view of a stepped heat dissipation unit dedicated for energy-saving frequency conversion and other electrical devices and a method thereof according to the present invention;
fig. 3 is a schematic side view of a stepped heat dissipation unit dedicated for energy-saving frequency conversion and other electrical devices and a method thereof according to the present invention;
FIG. 4 is an air-water cooling working schematic diagram of the energy-saving stepped heat dissipation unit dedicated for frequency conversion and other electrical equipment and the method thereof;
fig. 5 is a water source cooling working schematic diagram of the energy-saving type stepped heat dissipation unit special for frequency conversion and other electrical equipment and the method thereof.
Illustration of the drawings:
1. a base; 2. a box body; 3. an axial flow fan; 4. an air outlet; 5. an air outlet flange; 6. a condensate water group; 7. a heat exchanger; 8. an evaporator; 9. and a water inlet and outlet interface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1-5, the present invention provides a technical solution: the utility model provides a special step heat dissipation unit of energy-saving electrical equipment such as frequency conversion and its method, including base 1, the last fixed surface of base 1 installs box 2, the outer fixed surface of box 2 installs axial fan 3, the surface of box 2 has seted up air outlet 4, one side fixed mounting that box 2 is close to air outlet 4 has air outlet flange 5, the inner wall fixed mounting of box 2 has comdenstion water group 6, the inner wall fixed mounting that box 2 is close to comdenstion water group 6 one end has heat exchanger 7, the inner wall fixed mounting that box 2 is close to air outlet flange 5 one side has evaporimeter 8, the inner wall fixed mounting that box 2 keeps away from evaporimeter 8 one side has business turn over water interface 9.
In this embodiment: the stepped temperature rise of cooling water is fully utilized to take away heat, the effect of hot air stepped temperature reduction is realized, when equipment is started, the cooling water firstly reduces the hot air temperature to a range of heating the water temperature by 5 ℃ through the air-water cooling system heat exchanger 7, at the moment, the water temperature can rise by 2-3 ℃, the cooling water passes through condensers of a plurality of groups of compressor refrigeration modules, the water temperature can rise by 5 ℃ immediately to take away the heat of a refrigerant, the compressor refrigeration modules work to cool hot air to a set temperature value, when the water temperature of the cooling water is lower and meets the heat dissipation requirement temperature of electrical equipment, only the air-water cooling system is operated, when the water temperature is higher or the equipment load is large and cannot meet the temperature requirement of the running environment of the equipment, the number of the compressor modules is started to further refrigerate according to the requirement until the running temperature of the equipment reaches a set value, when the indoor humidity is higher than the set value, the compressor dehumidification mode is started until the temperature and humidity curve between the electrical equipment is within a range of 3K3, the unit is integrated with two refrigeration operation modes of air-water refrigeration and refrigeration of a plurality of groups of compressor modules, automatic mode switching and module switching quantity control under different water temperatures and load conditions are realized through fuzzy control logic, a stepped cooling function is realized to achieve the aim of energy-saving operation, the air-water cooling heat exchange and the plurality of groups of compressor refrigeration modules are combined together through the stepped heat dissipation unit device, the operation temperature, humidity and safe operation requirements of the equipment are accurately met in a most energy-saving mode, and meanwhile, the integrated electric room environment management monitoring function is provided, one-stop intelligent monitoring and management problems of an unattended distribution room can be realized, the management cost is saved, and the internet of things can be collected through technology, The comprehensive data of the power distribution room are analyzed, indoor temperature and humidity intelligent control and fresh and return air intelligent distribution are adopted, comprehensive energy efficiency management of the power distribution room is achieved, energy consumption is saved, carbon emission is reduced, and safe and stable operation of equipment is achieved.
Specifically, the number of the heat exchangers 7 is two, and the two groups of heat exchangers 7 are symmetrically distributed.
In this embodiment: two sets of heat exchangers 7 are the symmetric distribution, can improve the heat exchange efficiency of whole unit greatly.
Specifically, one side of the box body 2 close to the axial flow fan 3 is fixedly provided with a protective shell, and the axial flow fan 3 is fixedly connected with the inner wall of the protective shell.
In this embodiment: the protective shell facilitates the installation of the axial flow motor and can play a certain protective role on the Saturday motor.
Specifically, one side of the box body 2, which is far away from the air outlet 4, is fixedly provided with a control box, and the air outlet flange 5 is fixedly connected with the outer surface of the box body 2 through bolts.
In this embodiment: the control box can realize regulating and controlling effectively whole ladder group, can prevent through bolted connection that air outlet flange 5 from dropping from box 2.
Specifically, the condensate water group 6 is fixedly connected with the heat exchanger 7, and the evaporator 8 is rectangular.
In this embodiment: the condensate water group 6 is fixedly connected with the heat exchanger 7, so that heat exchange of the whole equipment can be facilitated, and the evaporator 8 is rectangular and can be conveniently installed and fixed.
Specifically, the outer surface of the base 1 is communicated with a drain pipe.
In this embodiment: the drain pipe can make things convenient for whole equipment to carry out the drainage.
The use method of the special stepped radiating unit for the energy-saving frequency conversion and other electrical equipment comprises the following steps:
s1, when the temperature of the cooling water is low and meets the heat dissipation requirement temperature of the electrical equipment, only operating the air-water cooling system;
s2, when the water temperature is high or the equipment load is large and can not meet the requirement of the equipment operation environment temperature, starting the number of the compressor modules for further refrigeration according to the requirement until the requirement that the equipment operation temperature reaches a set value is met;
and S3, when the indoor humidity is larger than the set value, starting the compressor dehumidification mode until the temperature and humidity curve between the electrical equipment is in the range of 3K 3.
The working principle is as follows: the stepped temperature rise of cooling water is fully utilized to take away heat, the effect of hot air stepped temperature reduction is realized, when equipment is started, the cooling water firstly reduces the hot air temperature to a range of heating the water temperature by 5 ℃ through the air-water cooling system heat exchanger 7, at the moment, the water temperature can rise by 2-3 ℃, the cooling water passes through condensers of a plurality of groups of compressor refrigeration modules, the water temperature can rise by 5 ℃ immediately to take away the heat of a refrigerant, the compressor refrigeration modules work to cool hot air to a set temperature value, when the water temperature of the cooling water is lower and meets the heat dissipation requirement temperature of electrical equipment, only the air-water cooling system is operated, when the water temperature is higher or the equipment load is large and cannot meet the temperature requirement of the running environment of the equipment, the number of the compressor modules is started to further refrigerate according to the requirement until the running temperature of the equipment reaches a set value, when the indoor humidity is higher than the set value, the compressor dehumidification mode is started until the temperature and humidity curve between the electrical equipment is within a range of 3K3, the unit is a whole machine device or is centrally controlled by networking, can automatically run without being attended, carries out remote monitoring and remote maintenance service by transmitting data through the Internet of things, integrates two refrigeration running modes of air-water refrigeration and refrigeration of a plurality of groups of compressor modules, realizes automatic mode switching and module switching quantity control under different water temperatures and load conditions through fuzzy control logic, and realizes a step cooling function so as to achieve the aim of energy-saving running.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes by using the technical contents disclosed in the above description to other fields, but any simple modification, equivalent change and change made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides a special step heat dissipation unit of electrical equipment such as energy-saving frequency conversion, includes base (1), its characterized in that: the utility model discloses a solar water heater, including base (1), box (2), outer fixed surface installs axial fan (3) of box (2), air outlet (4) have been seted up to the surface of box (2), one side fixed mounting that box (2) are close to air outlet (4) has air outlet flange (5), the inner wall fixed mounting of box (2) has comdenstion water group (6), the inner wall fixed mounting that box (2) are close to comdenstion water group (6) one end has heat exchanger (7), the inner wall fixed mounting that box (2) are close to air outlet flange (5) one side has evaporimeter (8), the inner wall fixed mounting that evaporimeter (8) one side was kept away from in box (2) has business turn over water interface (9).
2. The special energy-saving stepped heat dissipation unit for frequency conversion and other electrical equipment as claimed in claim 1, wherein: the number of the heat exchangers (7) is two, and the two groups of the heat exchangers (7) are symmetrically distributed.
3. The special energy-saving stepped heat dissipation unit for frequency conversion and other electrical equipment as claimed in claim 1, wherein: a protective shell is fixedly mounted on one side, close to the axial flow fan (3), of the box body (2), and the axial flow fan (3) is fixedly connected with the inner wall of the protective shell.
4. The special energy-saving stepped heat dissipation unit for frequency conversion and other electrical equipment as claimed in claim 1, wherein: one side of the box body (2) far away from the air outlet (4) is fixedly provided with a control box, and the air outlet flange (5) is fixedly connected with the outer surface of the box body (2) through bolts.
5. The special energy-saving stepped heat dissipation unit for frequency conversion and other electrical equipment as claimed in claim 1, wherein: the condensed water group (6) is fixedly connected with the heat exchanger (7), and the evaporator (8) is rectangular.
6. The special energy-saving stepped heat dissipation unit for frequency conversion and other electrical equipment as claimed in claim 5, wherein: the outer surface of the base (1) is communicated with a drain pipe.
7. The special energy-saving stepped heat dissipation unit for the frequency conversion and other electrical equipment according to claim 1, is characterized in that: the use method of the energy-saving stepped heat dissipation unit special for the frequency conversion and other electrical equipment comprises the following steps:
s1, when the temperature of the cooling water is low and meets the heat dissipation requirement temperature of the electrical equipment, only operating the air-water cooling system;
s2, when the water temperature is high or the equipment load is large and can not meet the requirement of the equipment operation environment temperature, starting the number of the compressor modules for further refrigeration according to the requirement until the requirement that the equipment operation temperature reaches a set value is met;
and S3, when the indoor humidity is larger than the set value, starting the compressor dehumidification mode until the temperature and humidity curve between the electrical equipment is in the range of 3K 3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011489581.1A CN113490389A (en) | 2020-12-16 | 2020-12-16 | Energy-saving stepped heat dissipation unit special for frequency conversion and other electrical equipment and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011489581.1A CN113490389A (en) | 2020-12-16 | 2020-12-16 | Energy-saving stepped heat dissipation unit special for frequency conversion and other electrical equipment and method thereof |
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Citations (7)
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| JP2008084916A (en) * | 2006-09-26 | 2008-04-10 | Sanyo Electric Co Ltd | Cooling device |
| CN201615582U (en) * | 2010-02-11 | 2010-10-27 | 华北电力大学（保定） | Integrated energy-saving type air-conditioning unit for communication base station |
| CN106524550A (en) * | 2016-12-27 | 2017-03-22 | 广东国得科技发展有限公司 | Container charging device with natural cooling function and cooling method |
| CN208113208U (en) * | 2018-04-24 | 2018-11-16 | 上海多立控制工程有限公司 | A kind of efficient cooling system for PLC control cabinet |
| CN210927426U (en) * | 2019-11-14 | 2020-07-03 | 中冶赛迪电气技术有限公司 | Novel air-water cooling device |
| CN112066457A (en) * | 2020-09-17 | 2020-12-11 | 中科(广东)环境科技有限公司 | Control method for tail end of efficient intelligent warm and humid air conditioner |
| CN213462849U (en) * | 2020-12-14 | 2021-06-15 | 广州能环电气机械科技有限公司 | Energy-saving type stepped heat dissipation unit special for frequency conversion and other electrical equipment |
-
2020
- 2020-12-16 CN CN202011489581.1A patent/CN113490389A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008084916A (en) * | 2006-09-26 | 2008-04-10 | Sanyo Electric Co Ltd | Cooling device |
| CN201615582U (en) * | 2010-02-11 | 2010-10-27 | 华北电力大学（保定） | Integrated energy-saving type air-conditioning unit for communication base station |
| CN106524550A (en) * | 2016-12-27 | 2017-03-22 | 广东国得科技发展有限公司 | Container charging device with natural cooling function and cooling method |
| CN208113208U (en) * | 2018-04-24 | 2018-11-16 | 上海多立控制工程有限公司 | A kind of efficient cooling system for PLC control cabinet |
| CN210927426U (en) * | 2019-11-14 | 2020-07-03 | 中冶赛迪电气技术有限公司 | Novel air-water cooling device |
| CN112066457A (en) * | 2020-09-17 | 2020-12-11 | 中科(广东)环境科技有限公司 | Control method for tail end of efficient intelligent warm and humid air conditioner |
| CN213462849U (en) * | 2020-12-14 | 2021-06-15 | 广州能环电气机械科技有限公司 | Energy-saving type stepped heat dissipation unit special for frequency conversion and other electrical equipment |
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