CN110719719A

CN110719719A - Phase change radiator based on intermittent operation

Info

Publication number: CN110719719A
Application number: CN201910968155.7A
Authority: CN
Inventors: 郑峰; 薛辉; 董志强; 任人
Original assignee: Xian University of Electronic Science and Technology
Current assignee: Xian University of Electronic Science and Technology
Priority date: 2019-10-12
Filing date: 2019-10-12
Publication date: 2020-01-21
Anticipated expiration: 2039-10-12
Also published as: CN110719719B

Abstract

The invention discloses a phase change radiator based on intermittent operation, which mainly solves the problems of larger volume, troublesome installation and maintenance and serious influence caused by working medium leakage of the existing radiator, and comprises the following components: the phase-change material-based air conditioner comprises a corrugated fin (1), a metal frame (2) and a phase-change material (3), wherein a power electronic device (7) is installed on one side of the metal frame, the outer surface of the metal frame is processed into the corrugated fin, an exhaust valve (5) is fixed on the other side of the metal frame, and a sealing structure (6) is installed on the exhaust valve; the metal frame is internally processed into pin fins (4), the phase-change material is filled in gaps of the pin fins, so that heat generated by the power electronic device is conducted through the metal frame and the pin fins and stored in the phase-change material, the heat stored in the phase-change material is rapidly conducted to the metal frame through the pin fins in the heat dissipation process, and the heat is conducted to the outside through the corrugated fins. The invention has small volume and good heat dissipation effect, and can be used for heat dissipation of power electronic devices.

Description

Phase change radiator based on intermittent operation

Technical Field

The invention belongs to the technical field of basic electrical elements, and particularly relates to a phase change radiator which can be used for radiating power electronic devices.

Technical Field

The high-power electronic switch inevitably generates great power loss in the use process, and then the power electronic switch is heated. The power electronic device can shorten the service life when working at a higher temperature for a long time, and once the temperature of the power electronic switch is higher than the maximum working temperature under an extreme working environment, the power electronic switch can be damaged, so that a radiator must be used for assisting the heat dissipation of the power electronic switch. The largest and the heaviest heat sink in the power electronic equipment is the heat sink, so the heat sink needs to be optimized in terms of its volume and weight while taking its heat dissipation performance into consideration.

For intermittently operating power electronic devices, such as resistance welding power supplies, the power electronic switch generates large loss in a short operating time, and the power electronic switch generates substantially no loss in a long intermittent period. In order to avoid huge loss generated in short working time, the currently adopted methods include water cooling heat dissipation and air cooling heat dissipation with larger volume and weight. For example, a battery water-cooling radiator with application number CN201410574401.8 uses a water pipe to continuously lead out heat from a heat source, and this method needs to be equipped with a water pump and a water tank, which is troublesome to maintain, and once working medium leakage occurs during use, the power electronic equipment is destructively damaged.

The phase change material absorbs a great amount of heat during the phase change process, and the temperature of the phase change material is substantially maintained. The organic phase change material has great latent heat of phase change, has insulating property, is non-corrosive, does not need to worry about the influence caused by working medium leakage, and is very suitable for being applied to a radiator of power electronic equipment. A phase change energy storage radiator such as CN201510462547.8, which fills a phase change material in a heat storage unit, wherein a pipe is embedded in the phase change material. The heat in the heat flow is stored in the phase-change material when the heat flow flows through the pipeline, when heat dissipation is needed, the convection between the heat storage box and the outside air is controlled by adjusting the convection heat dissipation flow channel switch on the surface of the box body to realize heat dissipation, and the heat storage and heat dissipation efficiency of the heat sink structure is lower because the structural design of the heat storage heat sink is not optimized on the heat conduction structure inside the heat storage unit.

Disclosure of Invention

The invention aims to provide a phase change radiator based on intermittent operation aiming at the defects of the prior art, so that the volume of the radiator is reduced, the heat radiation performance and the reliability are improved, and the radiator is convenient to use.

The technical scheme of the invention is realized as follows:

aiming at the power electronic devices working intermittently, the invention utilizes the advantage of extremely large latent heat of the phase-change material to absorb the huge heat generated in the short-time working process, and then the heat is radiated through the heat radiation structure of the radiator in a longer working intermittent period. The heat of the power electronic device in the intermittent working mode is balanced, and the size of the radiator is further reduced. The temperature of the radiator is accurately controlled by utilizing the characteristic that the temperature of the phase-change material is basically unchanged during the phase change, so that the working temperature of the power electronic device is accurately controlled. The structure is as follows:

the utility model provides a phase transition radiator based on intermittent type formula work, includes corrugate fin, metal crate and phase change material, and power electronic device is installed to metal crate one side, and the metal crate surface is processed into corrugate fin, its characterized in that:

an exhaust valve is fixed on the other side of the metal frame, and a sealing structure is arranged on the exhaust valve;

the metal frame is internally processed into pin fins, the phase-change material is filled in gaps of the pin fins, so that heat generated by the power electronic device is conducted through the metal frame and the pin fins and stored in the phase-change material, the heat stored in the phase-change material is rapidly conducted to the metal frame through the pin fins in the heat dissipation process, and the heat is conducted to the outside through the corrugated fins.

Preferably, the phase-change material is an organic phase-change material, and the phase-change temperature is 40-100 ℃.

Preferably, the sealing structure uses an elastic insulating rubber tube, one end of the elastic insulating rubber tube is sleeved on the exhaust valve, the other end of the elastic insulating rubber tube is tightly contracted, when the solidification volume of the phase change material in the metal frame expands, the internal air pressure of the metal frame is higher than the external air pressure, so that the insulating sleeve is expanded, and redundant air in the radiator is exhausted to the outside; when the phase change material inside the metal frame melts and shrinks in volume, the air pressure inside the metal frame is lower than the outside, the rubber sleeve is further extruded, and outside air is prevented from entering the inside of the metal frame.

Preferably, the metal frame is made of copper or aluminum or a metal material with the thermal conductivity higher than 150W/m.K.

Preferably, the height of the corrugated fin is lower than the height of the power electronic device.

Preferably, the pin fins are arranged in an array, the diameter of each pin fin is 1mm-10mm, and gaps are reserved among the pin fins.

Preferably, the volume of the metal frame is proportional to the loss of the power electronic device to be cooled.

The invention has the following advantages:

1. according to the invention, as the interior of the metal frame is processed into the pin fin structure, and the phase-change material is filled between the pin fins, the heat exchange efficiency between the phase-change material and the metal frame is greatly improved, so that the temperature of the metal frame is basically consistent with that of the phase-change material. Meanwhile, the temperature change of the organic phase-change material during phase change is within a few degrees centigrade, so that the working temperature of the radiator can be accurately controlled by selecting the phase-change temperature of the organic phase-change material during actual use.

2. According to the invention, the exhaust valve and the sealing structure are matched for use, so that gas in the metal frame can be exhausted out of the radiator, external gas cannot enter the radiator, the influence of external salt mist, humidity and other environments on the performance of the phase-change material can be avoided, and the reliability of the radiator is improved.

3. The organic phase change material used in the invention is non-corrosive and insulating, thereby avoiding the influence of working medium leakage on the system.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a side cross-sectional schematic view of FIG. 1;

FIG. 3 is a schematic top cross-sectional view of FIG. 1;

fig. 4 is a schematic view of a vent valve and seal arrangement of the present invention.

Detailed Description

Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings.

Referring to fig. 1, 2 and 3, the present invention is based on a phase change radiator operating intermittently, comprising an outer corrugated fin 1, a metal frame 2, a phase change material 3, an inner pin fin 4, an exhaust valve 5 and a sealing structure 6. A flat area is reserved in the middle of one side of the surface of the metal frame 2 of the radiator for mounting a power electronic device 7, and the rest part is made into corrugated fins 1 to increase the radiating area. An exhaust valve 5 is installed on the other side of the metal frame 2, the exhaust valve 5 is in the shape of a raised hollow cylinder, a small hole is formed in the side face of the cylinder to serve as an exhaust hole, and the exhaust valve 5 is installed on the radiator through a threaded hole. An elastic insulating rubber tube is sleeved on the exhaust valve 5 to form a sealing structure 6. A plurality of pin fins 4 arranged in an array form are processed inside the metal frame 2 of the radiator, and phase-change materials 3 are filled in gaps among the pin fins. Wherein:

the metal frame 2 is made of aluminum or copper or a metal material with the thermal conductivity more than 150W/m.K, the example is aluminum with the thermal conductivity of 237W/m.K, the inner pin fins 4 are cuboid, the maximum length of the cross section of the cuboid is 1mm-10mm, and the example is square with the cross section of 1.5 mm; the gap width between adjacent pin fins 4 is 1mm to 10mm, and the gap width is 1.5mm in this example, but not limited thereto. The height of the corrugated fins outside the metal frame is lower than that of the power electronic device, and the height of the corrugated fins is 3mm in the example, but the interval between two adjacent corrugated fins is 2 mm.

The phase-change temperature of the phase-change material 3 is 40-100 ℃, one kilogram of the phase-change paraffin can absorb energy of about 200kJ when being completely melted, and the phase-change material 3 can absorb huge heat while keeping the temperature basically unchanged during phase change, so that the temperature of the radiator during working can be controlled by changing the phase-change temperature of the selected phase-change material 3. Considering that the performance of the power electronic device 7 is affected and the service life of the power electronic device is shortened when the power electronic device is operated at an excessively high temperature, and the phase change material 3 may be subjected to phase change at an ambient temperature due to an excessively low phase change temperature, and a part of latent heat of phase change is wasted, the phase change material 3 with a suitable phase change temperature needs to be selected by combining the operating temperature of the power electronic device 7 to be radiated with the ambient temperature under actual working conditions. The phase-change material selected in the example is phase-change paraffin with the phase-change temperature of 52 ℃. The pin fins 4 arranged in an array can effectively improve the heat exchange efficiency between the phase change material 3 and the metal frame 2.

The huge heat generated by the power electronic device 7 in a short working time is mainly transferred to the internal phase-change material 3 through the metal frame 2 and the internal pin fins 4, and a small part of the heat is conducted to the external environment through the corrugated fins 1 on the surface of the heat radiator. During the longer operating pauses of the power electronics 7, the heat stored in the phase change material 3 inside the heat sink is conducted through the pin fins 4 to the metal frame 2 and through the surface corrugated fins 1 to the environment. Before the next power electronic device working time comes, the heat generated in the previous working period is conducted to the external environment in a longer intermission period. Such a reciprocating cycle allows the temperature of the heat sink to be maintained at the phase transition temperature throughout the operating and rest periods of the power electronics 7.

Referring to fig. 4, the exhaust valve 5 is a hollow cylinder structure, the side of the cylinder is provided with an exhaust hole, and the bottom of the cylinder is provided with threads for mounting the exhaust valve on a metal frame. The sealing structure 6 is formed by an insulating rubber tube, one end of the sealing structure is sleeved on the exhaust valve, and the other end of the sealing structure is tightly contracted.

The sealing structure 6 is sleeved on the exhaust valve 5 by using an insulating rubber pipe, and the insulating rubber pipe is in a contraction state at ordinary times to prevent external gas dust and the like from entering the radiator. When the phase-change material 3 is solidified and expands in volume, the gas in the radiator can be extruded to prop open the rubber tube, so that the gas in the radiator is discharged to the outside. When the phase change material 3 in the radiator absorbs heat and melts and the volume shrinks, the external air pressure of the radiator is larger than the internal air pressure, so that the rubber tube is further extruded, and the external air, dust and the like are still isolated outside the radiator by the sealing structure 6.

The specific assembly relationship of this example is: firstly, injecting a melted phase change material 3 into a pin fin gap inside the metal frame 2 through a threaded hole in a water bath state, then installing an exhaust valve 5, and finally installing a sealing structure 6 on the exhaust valve 5.

Those skilled in the art will appreciate that variations may be implemented by those skilled in the art in combination with the prior art and the above-described embodiments, and will not be described in detail herein. Such variations do not affect the essence of the present invention and are not described herein.

The above description is of the preferred embodiment of the invention. It is to be understood that the invention is not limited to the particular embodiments described above, in that devices and structures not described in detail are understood to be implemented in a manner common in the art; it will be understood by those skilled in the art that various changes and modifications may be made, or equivalents may be modified, without departing from the spirit of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.

Claims

1. Phase change radiator based on intermittent type formula work, including corrugate fin (1), metal crate (2) and phase change material (3), power electronic device (7) are installed to metal crate one side, and metal crate (2) surface is processed into corrugate fin (1), its characterized in that:

an exhaust valve (5) is fixed on the other side of the metal frame (2), and a sealing structure (6) is arranged on the exhaust valve (5); the metal frame is internally processed into pin fins (4), the phase change material (3) is filled in gaps of the pin fins (4), so that heat generated by the power electronic device (7) is conducted through the metal frame (2) and the pin fins (4) and stored in the phase change material (3), the heat stored in the phase change material (3) is rapidly conducted to the metal frame (2) through the pin fins (4) in the heat dissipation process, and the heat is conducted to the outside through the corrugated fins (1).

2. The phase change heat sink of claim 1, wherein: the phase-change material (3) is an organic phase-change material, and the phase-change temperature is 40-100 ℃.

3. The phase change heat sink of claim 1, wherein: the sealing structure (6) uses an elastic insulating rubber tube, one end of the sealing structure is sleeved on the exhaust valve (5), the other end of the sealing structure is tightly contracted, when the solidification volume of the phase change material (3) in the metal frame (2) is expanded, the internal air pressure of the metal frame (2) is higher than the external air pressure, so that the insulating sleeve is expanded, and redundant air in the radiator is exhausted to the outside; when the phase change material inside the metal frame melts and shrinks in volume, the air pressure inside the metal frame is lower than the outside, the rubber sleeve is further extruded, and outside air is prevented from entering the inside of the metal frame.

4. The phase change heat sink of claim 1, wherein: the metal frame (2) is made of copper or aluminum or a metal material with the thermal conductivity higher than 150.

5. The phase change heat sink of claim 1, wherein: the height of the corrugated fin (1) is lower than that of the power electronic device (7).

6. The phase change heat sink of claim 1, wherein: the pin fins (4) are arranged in an array shape, the diameter of each pin fin is 1mm-10mm, and gaps are reserved among the pin fins.

7. The phase change heat sink of claim 1, wherein: the volume size of the metal frame (2) is in direct proportion to the loss size of the heat-dissipated power electronic device (7).