WO2017084338A1

WO2017084338A1 - Heat exchange device

Info

Publication number: WO2017084338A1
Application number: PCT/CN2016/086750
Authority: WO
Inventors: 王雄; 忻力; 李彦涌; 范伟; 陈玉其; 王晓元; 王幸智; 姚磊; 唐威
Original assignee: 中车株洲电力机车研究所有限公司
Priority date: 2015-11-19
Filing date: 2016-06-22
Publication date: 2017-05-26
Also published as: CN105431005A

Abstract

A heat exchange device comprises a substrate (1), a flat plate heat pipe (4) mounted on one side of the substrate (1), and a cover plate (2) mounted on the other side of the substrate (1) in a sealing manner. The flat plate heat pipe (4) is internally provided with a vacuum chamber having a capillary structure, and a heat exchange working medium located in the vacuum chamber. A cooling fluid flow passage is formed between the cover plate (2) and the substrate (1). When the temperature of peripheral air around the flat plate heat pipe (4) is higher than the temperature of the flat plate heat pipe (4), the peripheral air is used as a heat source, and the peripheral air can be cooled by the heat exchange device. When the temperature of the peripheral air around the flat plate heat pipe (4) is lower than the temperature of the flat plate heat pipe (4), the peripheral air is used as a cold source, and a power electronic component heat source can be cooled by the peripheral air. According to the heat exchange device, the flat plate heat pipe (4) and a corresponding water cooling pipeline are integrated by means of the substrate (1), so that different operating modes are switched correspondingly according to different actual application conditions; and the flat plate heat pipe (4) is used as a backup for water cooling and heat dissipation, and it can be ensured that heat dissipation stills normally works when a fault occurs on the water cooling pipeline, thereby improving use reliability.

Description

Heat exchange device

The present application claims priority to Chinese Patent Application No. 201510814700.9, the entire disclosure of which is hereby incorporated herein in

Technical field

The invention relates to the technical field of temperature control of power electronic devices, and in particular to a heat exchange device.

Background technique

The converter cabinet has a large number of heat-generating components such as resistors, transformers, reactors, copper bars and capacitors. These electrical components generate a lot of heat during operation. Since there are semiconductor components such as IGBTs, the heat generated when the converter operates may cause the temperature of the semiconductor components to exceed the junction temperature and affect the reliability of the components. Therefore, the converter needs to be set to use corresponding heat during use. Switch.

There are water-cooled water-cooled radiators for cooling power electronics in existing converter cabinets, and air-cooled radiators. However, this type of radiator is a single type of radiator, which has the risk of failure of the power component and heat exchange failure during use; when this problem occurs, the rapid rise of the junction temperature of the power electronics will invalidate the semiconductor component. Affect the entire converter to work properly. As the demand for applications increases, the power of existing converters continues to increase, and the heat production thereof also increases substantially. The possibility of using existing water-cooled and air-cooled radiators to increase power and the failure rate increases accordingly.

Summary of the invention

In order to solve the problem that the existing converter heat exchange device adopts a single cooling mode and may cause failure and heat dissipation, the present invention provides a new heat exchanger for a converter.

The present invention provides a heat exchange device including a substrate, a flat heat pipe mounted on one side of the substrate, and a cover plate sealed on the other side of the substrate; a vacuum chamber having a capillary structure in the flat heat pipe and located a heat exchange medium in the vacuum chamber; a cooling liquid flow path between the cover plate and the substrate; and a temperature of a peripheral air of the flat heat pipe is higher than a temperature of the flat heat pipe And the heat in the air is transferred to the cooling liquid in the cooling liquid passage through the flat heat pipe and the substrate; when the ambient air temperature of the flat heat pipe is lower than the temperature of the flat heat pipe, the substrate is on the substrate The heat is transferred to the surrounding air through the flat heat pipe.

Optionally, there are a plurality of the flat heat pipes; and the heat radiating fins are connected between the flat heat pipes.

Optionally, there is also a driving water pump; a water nozzle that communicates the coolant flow path and the driving water pump is mounted on the cover plate.

Optionally, a fan that drives air to circulate on the surface of the flat heat pipe is further included.

Optionally, there is also a controller that is in communication with the drive water pump and the fan, respectively.

Optionally, the substrate and the cover plate, the cover plate and the water nozzle are all welded connections.

Optionally, the substrate and the flat heat pipe are connected by one or more of welding, bonding or interference fit.

The invention provides a heat exchange device for a converter, which integrates a flat heat pipe and a corresponding water-cooled pipeline through a substrate, and switches different working modes according to actual application conditions; and the flat heat pipe is used as a backup of water cooling and heat dissipation, and can ensure When the water-cooled pipeline fails, the heat sink of the converter still works normally, improving the reliability of use.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic view of a heat exchanger of a converter according to an embodiment of the present invention;

Among them: 1-substrate, 2-cover, 3-water nozzle, 4-plate heat pipe, 5-fin, 6-heating device.

detailed description

The invention provides a converter heat exchange device, which realizes rapid exchange and loss of heat by installing a flat heat pipe and a corresponding water-cooled pipeline, and effectively reduces the temperature of the converter cabinet or the junction temperature of the power electronic device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a heat exchange device according to an embodiment of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Some embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

As shown in FIG. 1, a heat exchange device according to an embodiment of the present invention includes a substrate 1, a flat heat pipe 4 mounted on one side of the substrate 1, and a cover 2 mounted on the other side of the substrate 1; wherein the cover 2 and the substrate 1 are sealed a coolant flow channel connecting the inside and forming a flowing coolant, the coolant flow channel is connected with a driving water pump for circulation, and the cooling liquid circulates under the action of the driving water pump; the vacuum chamber having the capillary structure in the flat heat pipe 4 and Heat exchange medium located in the vacuum chamber. After the heat exchange device is installed in the converter panel, the cover plate 2 can be attached to the heat generating device 6 in the converter to achieve corresponding heat exchange.

Specifically, depending on the surrounding environment, the heat exchange device may have three working modes during its use:

For example, when the air around the flat heat pipe 4 is hot air, that is, part of the heat generated by the power electronic device such as the heat generating device 6 is released into the air to make the air also become a heat source (referred to as a dual heat source mode), the end of the flat heat pipe 4 near the hot air is The heating section is adjacent to the end of the substrate 1 as a condensation section, and the heat exchange medium evaporates and vaporizes in the heating section and flows to the condensation section close to the substrate 1 under the pressure difference, and transfers the heat to the substrate 1 and is absorbed and discharged by the cooling liquid; The heat generated by the heat generating device 6 adjacent to the cover 2 is also absorbed and discharged by the cooling liquid. When used in a converter panel, the heat exchange device generally operates in a dual heat source mode, that is, when the heat in the air is led to the coolant in the substrate 1 by the flat heat pipe 4, the substrate 1 and the cover 2 are composed. The water-cooled radiator is integrated into the heat exchange of the flat heat pipe 4, which reduces the length of the coolant pipe, thereby reducing the possibility of coolant leakage and improving the reliability of the device.

If the air around the flat heat pipe 4 is cold air and the coolant flow is insufficient to discharge the heat generated by the heat generating device 6 (referred to as the double cold source mode), the end of the flat heat pipe 4 near the substrate 1 becomes a heating section and is close to the end of the cold air. For the condensation section, the heat transfer medium is also vaporized in the heating section and condensed in the condensation section to transfer heat from the substrate 1 to the cold air, while the heat is discharged by the coolant and the cold air.

When the air around the flat heat pipe 4 is substantially the same as the temperature around the substrate 1, since there is no temperature difference power, the heat transfer medium in the flat heat pipe 4 does not flow without heat exchange, and only the coolant in the coolant channel absorbs heat. And exclude heat.

In order to improve the heat exchange efficiency of the entire heat exchange device, in one embodiment of the present invention, a plurality of flat heat pipes 4 are connected to the substrate 1 and the fins 5 are connected between the flat heat pipes 4; The heat exchange rate of air improves the heat exchange efficiency.

In the embodiment shown in the drawings, the water nozzles 3 for connecting the coolant passage and the external heat sink are disposed on the cover plate 2, and the driving water pump circulates the low temperature coolant cooled outside to the coolant passage. Of course, in other embodiments, the water nozzle 3 can also be disposed on the substrate 1.

Further, in a specific embodiment of the present invention, a fan that drives air to flow on the surface of the flat heat pipe 4 may be disposed, and the air circulation is blown by the fan to further increase the heat exchange efficiency of the flat heat pipe 4. In practical applications, a controller connected to the driving water pump and the fan may be provided, and the controller is used to control whether the driving water pump and the fan work, and switch different heat exchange types. At this time, a new type different from the foregoing three modes is formed. Working mode:

In this mode of operation, the coolant stops flowing and the heat is transferred from the substrate 1 to the air by the flat heat pipe 4; this mode of operation is suitable for the failure of the coolant passage or the need for overhaul, especially to improve the reliability of the entire cooling system. Sexuality, reduce the probability of failure of the converter when it is used due to excessive temperature.

In the specific application of the present invention, each of the above components is preferably a solder joint; wherein the substrate 1 and the cover plate 2 are preferably brazed or friction stir welded, and the nozzle 3 and the cover 2 are preferably argon arc welding or friction stir welding. Connections ensure the sealing reliability of the coolant flow path. In addition, since the sealing connection is not required between the flat heat pipe 4 and the substrate 1, the two may be welded joints or bonded or interference fit.

The converter heat exchanger of the embodiment of the present invention has been described in detail above. The present invention has been described with reference to specific examples. The foregoing description of the embodiments of the present invention is only for the purpose of understanding the embodiments of the present invention. And modifications, such modifications and modifications are also intended to fall within the scope of the invention.

Claims

A heat exchange device comprising: a substrate (1); a flat heat pipe (4) mounted on one side of the substrate (1); and a cover plate sealed on the other side of the substrate (1) (2) a vacuum chamber having a capillary structure in the flat heat pipe (4) and a heat exchange medium located in the vacuum chamber; a coolant flow between the cover plate (2) and the substrate (1) When the ambient air temperature of the flat heat pipe (4) is higher than the temperature of the flat heat pipe (4), heat in the air is transferred to the cooling through the flat heat pipe (4) and the substrate (1) a cooling liquid in the liquid flow path; when the ambient air temperature of the flat heat pipe (4) is lower than the temperature of the flat heat pipe (4), heat on the substrate (1) is transmitted through the flat heat pipe (4) To the surrounding air.
The heat exchange device according to claim 1, characterized by comprising a plurality of said flat heat pipes (4); and said heat radiating fins (5) are connected between said flat heat pipes (4).
A heat exchange apparatus according to claim 1 or 2, further comprising: a drive water pump; a water nozzle (3) communicating with said coolant flow path and said drive water pump is mounted on said cover plate (2) .
The heat exchange device according to claim 3, further comprising a fan that drives air to flow on the surface of the flat heat pipe (4).
The heat exchange device according to claim 4, further comprising a controller in communication with said drive water pump and said fan, respectively.
The heat exchange device according to claim 5, characterized in that the substrate (1) and the cover plate (2), the cover plate (2) and the water nozzle (3) are both welded.
The heat exchange device according to claim 5, characterized in that the substrate (1) and the flat heat pipe (4) are connected by one or more of welding, bonding or interference fit.