CN208623559U - Water-cooled high-frequency switch rectifying power supply - Google Patents
Water-cooled high-frequency switch rectifying power supply Download PDFInfo
- Publication number
- CN208623559U CN208623559U CN201821493781.2U CN201821493781U CN208623559U CN 208623559 U CN208623559 U CN 208623559U CN 201821493781 U CN201821493781 U CN 201821493781U CN 208623559 U CN208623559 U CN 208623559U
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- water
- power supply
- supply box
- pressing plate
- cooled
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
- H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
- H01R24/40—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
- H01R24/54—Intermediate parts, e.g. adapters, splitters or elbows
- H01R24/545—Elbows
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
- H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
- H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
- H01R9/0518—Connection to outer conductor by crimping or by crimping ferrule
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2103/00—Two poles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
- H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
- H01R24/40—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
- H01R24/50—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency mounted on a PCB [Printed Circuit Board]
Abstract
The utility model discloses a kind of water-cooled high-frequency switch rectifying power supplies, are related to rectifier power source technical field, its key points of the technical solution are that: including power supply box, high frequency transformer and bridge rectifier；Water-cooled plate is provided on power supply box inside, water-cooled plate is internally provided with water cooling runner, and water cooling runner both ends are respectively water inlet end and water outlet；It is equipped with the water inlet pipe for being connected to water inlet end on power supply box, water pump is provided with outside power supply box, and the water outlet of water pump is connected with the end that water inlet pipe protrudes from power supply box；The outlet pipe for being connected to water outlet is equipped on power supply box.In use, cooling water is injected into water cooling runner by water pump, when cooling water flows in water cooling runner, cooling water can take away the heat in power supply box, and in the process, extraneous impurity is not easy to advance in the air that the heat for enabling component to generate inside power supply box and on the component being attached to inside power supply box is effectively conducted to power supply box.
Description
Technical field
The utility model relates to rectifier power source technical field, in particular to a kind of water-cooled high-frequency switch rectifying power supply.
Background technique
With the development of power electronic devices, the topological structure of device and control technology, modern power electronics technology is
As efficient, energy saving, traditional equipment transformation and the important means and key factor of industrial upgrading.Recent domestic is developed in succession
It is used for the high efficiency high frequency Switching Power Supply of low-pressure field out.Switching Power Supply is using modern power electronics technology, and control semiconductor is opened
The time ratio that device turns on and off is closed, maintains a kind of stable power supply of output voltage electric current, Switching Power Supply is generally by main electricity
Road and control circuit are constituted.Tradition plating electrolysis direct current power supply mainly uses industrial frequency rectifying, uncontrollable rectification, thyristor controllably whole
Flow Technique, power source equipment volume is big, high energy consumption and efficiency is low, and net side power factor is low, harmonic content is high, has seriously affected enterprise
The safe operation of industry power distribution network.Compared with traditional industrial frequency rectifying power supply, novel switched power supply has energy-efficient, light-weight, body
Product is small, and dynamic property is good, more adaptable, is advantageously implemented the remarkable advantages such as Technics Process Automation and intelligentized control method.
Since key components work in HF switch state, small power consumption, high conversion rate, and body inside high frequency switch power
Long-pending and weight only has the 20%~30% of linear power supply, therefore it has become the main product of regulated power supply at present, has in industrial circle
Very extensive application.Medium-and-large-sized high frequency switch power can generate amount of heat at work, need by built-in or outer
The radiator set is cooled down, and otherwise built-in temperature is excessively high, machine cisco unity malfunction.
Currently, the Chinese patent that notification number is CN207251441U discloses a kind of knot of air-cooled high frequency switch power
Structure, including power supply main body, the power supply main body is by being arranged in the power supply box of the power supply body side and being arranged in the power supply main body
Internal high frequency transformer is constituted, and the side of the high frequency transformer is equipped with full-bridge rectifier, the side of the full-bridge rectifier
Face is equipped with conductivity cell, and the full-bridge rectifier is electrically connected with high frequency transformer by conductivity cell, the full-bridge rectifier
Side is equipped with electric current access device；The bottom of the power supply box is equipped with radiator fan.
In use, it is dried to power supply body interior for being cooled down to power supply main body by radiator fan.No
It crosses during this, wind can carry more impurity secretly and enter power supply body interior, and part enters the impurity meeting of power supply main body
It is attached on each component of power supply body interior.With the increase of use time, dust covers each component and very big journey
The heat-sinking capability of power supply main body is reduced on degree.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model is to provide a kind of rectifications of water-cooled HF switch
Power supply, having can be adequately cooled in use, and the advantage that impurity is not easily accessible in cooling procedure.
The above-mentioned technical purpose of the utility model has the technical scheme that a kind of water-cooled high frequency is opened
Rectifier power source is closed, including power supply box, the high frequency transformer being set to inside the power supply box, is set to inside the power supply box simultaneously
The bridge rectifier being electrically connected with the high frequency transformer；Water-cooled plate is provided on the power supply box inside, in the water-cooled plate
Portion is provided with Cooling Water flowing water cold runner, and water cooling runner both ends are respectively water inlet end and water outlet；The bridge
Formula rectifier is connected to the water-cooled plate lateral wall by bolt presses；It is equipped on the power supply box and is connected to the water inlet end
Water inlet pipe, water pump is provided with outside the power supply box, and the water outlet of the water pump and the water inlet pipe protrude from the electricity
The end of source case is connected；The outlet pipe for being connected to the water outlet is equipped on the power supply box.
Through the above technical solutions, when using the rectifier power source, by water pipe by the water inlet and external water source of water pump
It is connected；Then water pump is opened, the cooling water in external water source is drawn into inside water pump by water pump via water pipe, and water pump is to inside
Cooling water pressurizeed after be fed through inside water inlet pipe, the cooling water inside water inlet pipe is flowed into inside water cooling runner later
And it is finally discharged from outlet pipe.During cooling water flows in water cooling runner, since power supply box internal temperature is greater than cold
But the temperature of water, the heat in the power supply box is conducted via water cooled pipeline into cooling water, so that the temperature in power supply box obtains
To reduce.Meanwhile during this, the impurity of external environment is not easily accessible inside power supply box and is attached to inside power supply box
On component, the heat-sinking capability of power supply main body itself ensure that a certain extent.
Preferably, it is covered with water-cooling cover on the high frequency transformer, offers coolant flow channel at the water-cooling cover inner wall, and
Coolant flow channel both ends are respectively communicated in the water inlet pipe and the outlet pipe.
Through the above technical solutions, in use, can be entered via water inlet pipe in coolant flow channel simultaneously when cooling
Finally go out to be discharged from outlet pipe.During this, cooling water can take away the heat that high frequency transformer generates, so that high frequency becomes
Depressor is not easy to damage because of overheat, ensure that the service life of the high frequency transformer to a certain extent.
Preferably, the power supply box bottom is provided with fan, and the fan includes being set on the power supply chamber interior wall
It is motor, coaxially connected in the flabellum on the motor output shaft.
Through the above technical solutions, in use, motor being connected with external power supply first, later opens motor
It opens, so that motor output shaft rotates.In motor output shaft rotation process, motor output shaft drives co-axial connected flabellum
Rotation is able to drive the flowing of power supply box inner air during flabellum rotation, air flowing facilitates scattering and disappearing for heat, so that electric
Temperature inside the case of source is not easy to increase.
Preferably, placing groove is offered on the power supply chamber interior wall, the fan is accommodated in inside the placing groove, described
It is provided with the partition for covering the placing groove notch on power supply chamber interior wall, offers several stomatas on the partition.
Through the above technical solutions, partition covers placing groove, so in use, it is set to inside power supply box
Each components and water pipe are not easy to touch with fan.
Preferably, the water cooling runner bending is set to inside the water-cooled plate.
Through the above technical solutions, the bending of water cooling runner is set to inside water-cooled plate, such cooling water flows in water-cooled plate
The dynamic time is longer, and the cooling water flowed in water cooling runner can take away more heats, improve cooling to a certain extent
The service efficiency of water.
Preferably, the water-cooled plate includes the first pressing plate, by bolt presses is connected to second on first pressing plate
Pressing plate；First pressing plate is towards the first sink is offered on the end face of second pressing plate, and second pressing plate is described in
The second sink is offered on the end face of first pressing plate, and second sink is opposite with first sink；When first pressure
When plate and second pressing plate fasten, first sink is connected to second sink and forms water cooling runner.
Through the above technical solutions, unscrewing the spiral shell on the second pressing plate when being attached with more scale in water cooling runner inner wall
Bolt so that bolt is separated with the first pressing plate, only need to control later the first pressing plate separates with the second pressing plate can be to the first sink
And second the scale that adheres in sink be purged.The water-cooled plate being arranged so simultaneously is more square when processing water cooling runner
Just.
Preferably, two caulking grooves are offered on first pressing plate, and two caulking grooves are symmetrically distributed in described first
Sink two sides；Two abaculus are convexly equipped on second pressing plate, and two abaculus are symmetrically distributed in second sink two
Side；When the second pressing plate snaps into first pressing plate, the abaculus stretch to inside the caulking groove and with the caulking groove inner wall
Fitting.
Through the above technical solutions, the abaculus on the second pressing plate is embedded in when the second pressing plate is snapped into the first pressing plate
Inside the caulking groove of one pressing plate, and the outer wall of abaculus contacts at the inner wall of caulking groove, in this way in water cooling runner flowing water be not easy from
It is flowed out in gap between first pressing plate and the second pressing plate, meanwhile, the gap of bending, such water are formed between abaculus and caulking groove
The cooling water flowed in cold runner needs that there is biggish pressure can flow out from the gap.In this first degree of setting
The leakproofness of water-cooled plate is improved, and guarantees that cooling water can smoothly flow through water cooling runner and be discharged from outlet pipe.
Preferably, it is glued on the caulking groove inner wall and is equipped with rubber pad.
Through the above technical solutions, when abaculus stretches to inside caulking groove, abaculus squeezes rubber pad, so that rubber pad occurs
The gap between abaculus and caulking groove is deformed and fills, so that the cooling water in water cooling runner is not easy from the first briquetting and the second briquetting
Between gap kind outflow.
In conclusion the utility model having the beneficial effect that in contrast to the prior art
1. in use, cooling water is injected into water cooling runner by water pump, when cooling water is in water cooling runner
When flowing, cooling water can take away the heat in power supply box, and in the process, extraneous impurity is not easy to advance to electricity
It inside the case of source and is attached on the component inside power supply box, the heat that component is generated is effectively conducted to power supply box
In interior air；
2. water-cooled plate includes the first pressing plate and the second pressing plate mutually compressed, in this way when processing water cooling runner compared with
For convenience, it and can be purged with the more convenient scale at the first sink and the second inboard wall of cistern；
3. in use, fan is able to drive the air inside power supply box and is flowed, air flowing facilitates heat
Amount is scattered and disappeared, so that the temperature inside power supply box is not easy to increase.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of embodiment, is mainly used for showing the composition situation of embodiment；
Fig. 2 is the structural schematic diagram of water-cooled plate, is mainly used for showing the composition situation of water-cooled plate.
Appended drawing reference: 1, power supply box；2, high frequency transformer；3, bridge rectifier；4, water-cooled plate；41, the first pressing plate；42,
Second pressing plate；5, water cooling runner；511, water inlet end；512, water outlet；521, the first sink；522, the second sink；6, water inlet pipe；
7, water pump；8, outlet pipe；9, water-cooling cover；10, coolant flow channel；11, fan；111, motor；112, flabellum；12, placing groove；13,
Partition；14, stomata；15, caulking groove；16, abaculus；17, rubber pad.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing.
A kind of water-cooled high-frequency switch rectifying power supply, as shown in Figure 1, including power supply box 1, being set to inside power supply box 1
High frequency transformer 2, the bridge rectifier 3 for being set to 1 inside of power supply box and being electrically connected with high frequency transformer 2.
As shown in Figure 1 and Figure 2, several water-cooled plates 4 are additionally provided with inside power supply box 1, and several water-cooled plates 4 pass through bolt pressure
It is close to and is connected to 1 inner wall of power supply box.Bridge rectifier 3 is connected at water-cooled plate 4 by bolt presses.Water-cooled plate 4 include with
1 inner wall of power supply box compresses the first connected pressing plate 41 and fits in the first pressing plate 41 and be connected to the first pressure by bolt presses
Second pressing plate 42 of plate 41.First pressing plate 41 towards the first sink 521 for offering bending setting on the end face of the second pressing plate 42,
And first the both ends of sink 521 extend through the top surface in the first pressing plate 41 and the bottom surface of the first pressing plate 41.Second pressing plate 42
The second sink 522 is offered on towards the end face of the first pressing plate 41, and the second sink 522 and the first sink 521 are opposite.When second
When pressing plate 42 is pressed on the first pressing plate 41, the second sink 522 is connected to the first sink 521 and forms water cooling runner 5.Water cooling runner
5 both ends are respectively the water outlet 512 of the water inlet end 511 that Cooling Water flows into and Cooling Water outflow.
First pressing plate 41 is towards offering two caulking grooves 15 on the end face of the second pressing plate 42, and two caulking grooves 15 are symmetrical
In 521 two sides of the first sink.It is glued on first sink, 521 inner wall and is equipped with rubber pad 17.Second pressing plate 42 is towards the first pressing plate 41
Integrally formed with two abaculus 16 on end face, and two abaculus 16 are symmetrically distributed in 522 two sides of the second sink.When the second pressing plate 42
When being pressure bonded to the first pressing plate 41, abaculus 16 is stretched to inside corresponding caulking groove 15, and rubber pad 17 is squeezed and deformed by abaculus 16, is made
Obtain the gap that rubber pad 17 is full of abaculus 16 and caulking groove 15.
As shown in Figure 1, being equipped with water inlet pipe 6 on power supply box 1, and 6 one end of water inlet pipe stretches to 1 inside of power supply box and passes through
Water pipe is connected with water inlet pipe 6, and 6 other end of water inlet pipe protrudes from the lateral wall of power supply box 1.Water pump is placed with outside power supply box 1
7, and the water inlet of water pump 7 is connected to by water pipe with external source, the water outlet of water pump 7 is with water inlet pipe 6 for the end of power supply box 1
Portion's connection.Also it is equipped with outlet pipe 8 on power supply box 1, and outlet pipe 8 stretches to the end of power supply box 1 and passes through water pipe and water outlet
512 are connected.
Placing groove 12 is offered at 1 inner wall of power supply box, and placing groove 12 is located at 1 bottom of power supply box.It is set inside placing groove 12
It is equipped with fan 11, fan 11 includes motor 111 and flabellum 112.Motor 111 is set to inside placing groove 12, and motor 111
Output shaft extends along direction straight up, and when in use, the needs of motor 111 are electrically connected with external power supply.Flabellum 112 is coaxially connected
In on 111 output shaft of motor, and flabellum 112 is accommodated in inside placing groove 12.Partition 13, partition are additionally provided with inside power supply box 1
13 are connected at 1 inner wall of power supply box by bolt presses, and partition 13 is used to cover in the notch of placing groove 12, opens on partition 13
Equipped with several stomatas 14.
It is covered with water-cooling cover 9 on high frequency transformer 2, the coolant flow channel of Cooling Water flowing is offered at 9 inner wall of water-cooling cover
10, and the both ends of coolant flow channel 10 pass through water pipe respectively and are connected with water inlet pipe 6 and outlet pipe 8.
The particular condition in use of water-cooled high-frequency switch rectifying power supply is as follows:, will during using the rectifier power source
Water pump 7 is opened, and the water in external source is pumped into via water pipe to water pump 7 by water pump 7, the cooling of 7 pairs of inside of water pump later
Water is fed through inside water inlet pipe 6 after being pressurizeed, and the part cooling water inside water inlet pipe 6 is flowed into water cooling runner 5 later
Portion simultaneously is used to cool down bridge rectifier 3, and part cooling water is flowed into 10 inside of coolant flow channel and for high frequency transformation
Device 2 is cooled down；The cooling water in cooling water and coolant flow channel 10 in final water cooling runner 5 is discharged by outlet pipe 8.
At the same time, the motor 111 being set to inside placing groove 12 is opened, 111 output shaft of motor drives co-axial connected fan
Leaf 112 rotates, the air flowing being able to drive in power supply box 1 in 112 rotation process of flabellum, so that the heat inside power supply box 1
It can faster scatter and disappear.
The above is only the exemplary embodiment of the utility model, the protection model rather than limited the present invention
It encloses, the protection scope of the utility model is determined by the attached claims.
Claims (8)
1. a kind of water-cooled high-frequency switch rectifying power supply including power supply box (1), is set to the internal high frequency of the power supply box (1)
Transformer (2) is set to the bridge rectifier (3) that the power supply box (1) is internal and is electrically connected with the high frequency transformer (2)；
It is characterized in that: being provided with water-cooled plate (4) on power supply box (1) inside, the water-cooled plate (4) is internally provided with Cooling Water stream
Dynamic water cooling runner (5), water cooling runner (5) both ends are respectively water inlet end (511) and water outlet (512)；The bridge-type
Rectifier (3) is connected to the water-cooled plate (4) lateral wall by bolt presses；It is equipped on the power supply box (1) and is connected to institute
The water inlet pipe (6) of water inlet end (511) is stated, is provided with water pump (7) outside the power supply box (1), and the water outlet of the water pump (7)
The end for protruding from the power supply box (1) with the water inlet pipe (6) is connected；It is equipped on the power supply box (1) described in being connected to
The outlet pipe (8) of water outlet (512).
2. water-cooled high-frequency switch rectifying power supply according to claim 1, it is characterized in that: on the high frequency transformer (2)
It is covered with water-cooling cover (9), is offered coolant flow channel (10) at water-cooling cover (9) inner wall, and coolant flow channel (10) both ends are distinguished
It is connected to the water inlet pipe (6) and the outlet pipe (8).
3. water-cooled high-frequency switch rectifying power supply according to claim 1, it is characterized in that: the power supply box (1) bottom is set
Be equipped with fan (11), the fan (11) include be set on the power supply box (1) inner wall motor (111), it is coaxially connected in
Flabellum (112) on motor (111) output shaft.
4. water-cooled high-frequency switch rectifying power supply according to claim 3, it is characterized in that: on the power supply box (1) inner wall
It offers placing groove (12), the fan (11) is accommodated in the placing groove (12) inside, is arranged on power supply box (1) inner wall
There is the partition (13) for covering the placing groove (12) notch, offers several stomatas (14) on the partition (13).
5. water-cooled high-frequency switch rectifying power supply according to claim 1, it is characterized in that: the water cooling runner (5) is bent
It is internal to be set to the water-cooled plate (4).
6. water-cooled high-frequency switch rectifying power supply according to claim 1, it is characterized in that: the water-cooled plate (4) includes the
One pressing plate (41) is connected to the second pressing plate (42) on first pressing plate (41) by bolt presses；First pressing plate
(41) towards offering the first sink (521) on the end face of second pressing plate (42), second pressing plate (42) is described in
It is offered on the end face of first pressing plate (41) the second sink (522), and second sink (522) and first sink
(521) opposite；When first pressing plate (41) and second pressing plate (42) fasten, first sink (521) with it is described
Second sink (522) is connected to and forms water cooling runner (5).
7. water-cooled high-frequency switch rectifying power supply according to claim 6, it is characterized in that: being opened on first pressing plate (41)
Equipped with two caulking grooves (15), and two caulking grooves (15) are symmetrically distributed in the first sink (521) two sides；Second pressure
Two abaculus (16) are convexly equipped on plate (42), and two abaculus (16) are symmetrically distributed in the second sink (522) two sides；
When the second pressing plate (42) snaps into the first pressing plate (41), the abaculus (16) stretch to the caulking groove (15) it is internal and with
Caulking groove (15) the inner wall fitting.
8. water-cooled high-frequency switch rectifying power supply according to claim 7, it is characterized in that: being glued on the caulking groove (15) inner wall
Equipped with rubber pad (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821493781.2U CN208623559U (en) | 2018-09-12 | 2018-09-12 | Water-cooled high-frequency switch rectifying power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821493781.2U CN208623559U (en) | 2018-09-12 | 2018-09-12 | Water-cooled high-frequency switch rectifying power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208623559U true CN208623559U (en) | 2019-03-19 |
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ID=65717422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821493781.2U Active CN208623559U (en) | 2018-09-12 | 2018-09-12 | Water-cooled high-frequency switch rectifying power supply |
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| Country | Link |
|---|---|
| CN (1) | CN208623559U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111549353A (en) * | 2020-05-18 | 2020-08-18 | 全球能源互联网研究院有限公司 | Water electrolysis hydrogen production system |
| CN115052469A (en) * | 2022-08-11 | 2022-09-13 | 江苏晨大电气股份有限公司 | Water cooling system of bidirectional converter cabinet for rail transit |
-
2018
- 2018-09-12 CN CN201821493781.2U patent/CN208623559U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111549353A (en) * | 2020-05-18 | 2020-08-18 | 全球能源互联网研究院有限公司 | Water electrolysis hydrogen production system |
| CN115052469A (en) * | 2022-08-11 | 2022-09-13 | 江苏晨大电气股份有限公司 | Water cooling system of bidirectional converter cabinet for rail transit |
| CN115052469B (en) * | 2022-08-11 | 2022-10-25 | 江苏晨大电气股份有限公司 | Water cooling system of bidirectional converter cabinet for rail transit |
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