CN210247363U

CN210247363U - Phase change radiator

Info

Publication number: CN210247363U
Application number: CN201921038717.XU
Authority: CN
Inventors: Yan Dai; 戴燕; Heng Zhang; 张衡; Rufeng Cai; 蔡如峰; Fang Zhang; 章放
Original assignee: Hefei Yingwei Electronic Technology Co ltd
Current assignee: Hefei Yingwei Electronic Technology Co ltd
Priority date: 2019-07-04
Filing date: 2019-07-04
Publication date: 2020-04-03
Anticipated expiration: 2029-07-04

Abstract

The utility model discloses a phase change radiator belongs to radiator technical field. The heat conduction body is internally provided with a closed cavity, the heat conduction body is provided with a liquid phase change material filling hole and an air suction hole, the cavity is provided with two opposite end faces and a side face located between the two end faces, and the heat conduction reinforcing rib is arranged on the end face of the cavity. The utility model discloses set up the heat conduction strengthening rib in the terminal surface of cavity, avoid because the side that leads to the cavity is connected with the side of cavity to the heat conduction strengthening rib produces the crackle with the junction of heat conduction strengthening rib, avoid holistic structure to suffer destruction promptly to guarantee holistic intensity.

Description

Phase change radiator

Technical Field

The utility model belongs to the technical field of the radiator, specifically speaking relates to a phase change radiator.

Background

The volume and the weight of the missile-borne electronic equipment are greatly limited, the internal space of the missile-borne electronic equipment is closed and narrow, and any forced convection heat dissipation cannot be carried out. With the rapid development and application of large-scale integrated circuits and power electronics, the heat dissipation problem of missile-borne electronic equipment is increasingly prominent. At present, missile-borne electronic equipment mainly radiates heat through phase-change materials, which mainly have the following effects: the heat is absorbed by latent heat of phase change, so that the temperature rise process caused by the work heating of electronic components is delayed; the temperature is stable in the phase change process, and the thermal stress and thermal shock of the electronic components are greatly relieved. The phase change heat dissipation means can be referred to as documents: based on the heat dissipation performance study of the missile-borne electronic device phase change heat sink device in yin hawo, liufenfen and royal [ J ]. electronic mechanical engineering, 2015,31(6):6-11, the literature shows that: the phase change heat sink device is formed by filling a phase change material into a hollow shell structure and packaging, the structural appearance can be designed according to needs or designed in an arched manner, and the common heat conduction enhancement design means comprises: graphite, copper powder and aluminum powder are doped in the phase-change material, or a metal fin is arranged in the packaging shell to serve as a heat conduction reinforcing rib ". Patent publication No.: 103997878A; the patent publication date is: 8, 20 days in 2014, the name of the invention is: a phase change heat sink device. The phase change heat sink device consists of a base body, a cover plate, a phase change material and a packaging block; the substrate is a shell with a groove on one surface, the groove is internally provided with heat conduction reinforcing ribs, the interior of the shell is divided into a plurality of sub-regions, and the height of the heat conduction reinforcing ribs is lower than the peripheral height of the substrate; the side surface of the base body is provided with an opening for pouring the phase-change material; one side of the groove of the base body is a main welding surface, the welding lap joint width of the base body and the cover plate is not less than 2mm, and the top surface of the reinforcing rib in the groove of the base body is a secondary welding surface; the cover plate is a flat plate with reinforcing ribs on one surface, and the reinforcing ribs on the cover plate correspond to the heat conduction reinforcing ribs in the grooves of the shell in position; the heat conducting reinforcing ribs can improve the heat conducting performance between the base body and the cover plate, and can also play a role in enhancing the expansion resistance and bending resistance mechanical properties of the shell. For the existing phase change heat sink device, the overall strength of the phase change heat radiator is difficult to ensure.

Disclosure of Invention

1. Problems to be solved

Be difficult to guarantee the problem of the holistic intensity of phase transition radiator to prior art, the utility model provides a phase transition radiator. This scheme sets up the heat conduction strengthening rib in the terminal surface of cavity, avoids because the side of heat conduction strengthening rib and cavity is connected the side that leads to the cavity and the junction of heat conduction strengthening rib produces the crackle, avoids holistic structure to suffer destruction promptly to guarantee holistic intensity. 2. Technical scheme

In order to solve the above problems, the utility model adopts the following technical proposal.

The phase change radiator comprises a heat conduction body and heat conduction reinforcing ribs, wherein a closed cavity is arranged inside the heat conduction body, a liquid phase change material filling hole and an air suction hole are formed in the heat conduction body, the cavity is provided with two opposite end faces and a side face located between the two end faces, and the heat conduction reinforcing ribs are arranged on the end faces of the cavity.

Preferably, a first gap is formed between the heat conduction reinforcing rib on one end face of the cavity and the heat conduction reinforcing rib on the other end face of the cavity.

Preferably, the heat conducting reinforcing ribs are in a grid shape.

Preferably, a second gap is formed between the heat conduction reinforcing rib and the side face of the cavity.

Preferably, the outer surface of the heat conduction body is provided with a weight reduction groove corresponding to the side surface of the cavity.

Preferably, the heat conducting body comprises a base body and a cover plate, the base body is an annular shell, and the cover plate is respectively packaged at two ends of the base body.

Preferably, the two cover plates are respectively provided with an electronic component.

Preferably, a heat conduction layer is arranged between the electronic component and the cover plate.

3. Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model discloses a phase change radiator can guarantee holistic intensity. The phase-change material is poured into the cavity in a liquid state, so that expansion and deformation of the heat-conducting body can be avoided, however, after the phase-change material is converted into a solid state from the liquid state, the volume can be contracted, the cavity is in a negative pressure state, and external air pressure acts on the outer surface of the heat-conducting body, so that the heat-conducting body is stressed. And prior art's heat conduction strengthening rib plays anti inflation effect, need be connected the side of heat conduction strengthening rib and cavity among the prior art promptly, at this moment, under the effect of pressure, the side junction of heat conduction strengthening rib and cavity produces compressive stress, leads to the side of cavity and the junction of heat conduction strengthening rib to produce the crackle easily for holistic structure suffers destruction, and holistic intensity descends promptly. In order to ensure the integral strength of the phase change radiator, the heat conduction reinforcing ribs are only arranged on the end faces of the cavity, so that cracks are prevented from being generated on the side faces of the cavity due to the action of pressure stress, and the integral strength of the phase change radiator is ensured.

(2) The utility model discloses a phase change radiator, the liquid phase change material of being convenient for fills up inside the cavity. Here, a first gap is formed between the heat conduction reinforcing rib on one end face of the cavity and the heat conduction reinforcing rib on the other end face of the cavity, and the first gap communicates the inside of the cavity everywhere, so that the liquid phase-change material can enter and fill the inside of the cavity.

(3) The utility model discloses a phase change radiator can guarantee solid-state phase change material at the inside filling rate of cavity. After the phase-change material is converted into the solid state from the liquid state, the volume can shrink, and in order to ensure the filling rate of the solid phase-change material in the cavity, a second gap is arranged between the heat-conducting reinforcing rib and the side face of the cavity, and the external air pressure acts on the outer surface of the heat-conducting body, so that the side face of the cavity can be sunken towards the inside of the cavity, the volume in the cavity is reduced, the filling rate of the solid phase-change material in the cavity is ensured, and the heat-conducting efficiency in the cavity is ensured.

(4) The utility model discloses a phase change radiator sets up the heavy recess that subtracts that corresponds with the cavity side at the surface of heat conduction body, and at this moment, the heat conduction body is thinner being equipped with the wall thickness that subtracts heavy groove, makes the side of cavity change sunkenly for further guarantee solid-state phase change material at the inside filling rate of cavity.

(5) The utility model discloses a phase change radiator, the heat conduction body includes base member and apron, and the base member is cyclic annular casing, and the both ends of base member are packaged with the apron respectively, and at this moment, the heat conduction strengthening rib setting is in a side of apron, because apron outlying operating space is great, processes the heat conduction strengthening rib on the apron, and is more convenient

(6) The utility model discloses a phase change heat radiator's overall structure is more compact, and here, electronic components distributes on two apron.

Drawings

Fig. 1 is a front view of the phase change heat sink of the present invention;

fig. 2 is a top view of the phase change heat sink of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is an enlarged view of B in FIG. 3;

fig. 5 is a schematic view of a first three-dimensional structure of the base body of the present invention;

fig. 6 is a schematic view of a second three-dimensional structure of the base body of the present invention;

fig. 7 is a schematic view of a three-dimensional structure of the cover plate of the present invention.

In the figure: 1. a thermally conductive body; 2. a heat conducting reinforcing rib; 3. a first gap; 4. a second gap; 5. a weight-reducing groove; 11. a substrate; 12. and (7) a cover plate.

Detailed Description

The present invention will be further described with reference to the following specific embodiments.

Example 1

As shown in fig. 1 to 4, a phase change heat sink includes a heat conductive body 1 and a heat conductive rib 2. A closed cavity is arranged inside the heat conduction body 1, and in the embodiment, the heat conduction body 1 is made of a metal material with a good heat conduction effect and a small density, such as an aluminum alloy material; the heat conduction body 1 is provided with a liquid phase change material filling hole and an air suction hole, the cavity is provided with two opposite end faces and a side face located between the two end faces, and the heat conduction reinforcing ribs 2 are arranged on the end faces of the cavity. The phase change material is filled into the cavity in a liquid state, so that on one hand, the air in the cavity is favorably discharged, and the heat conduction efficiency is ensured; on the other hand, the phase-change material has two forms of a solid state and a liquid state, wherein the volume of the liquid phase-change material is the largest, so that the phase-change material is poured into the cavity in the liquid state form, and the expansion deformation of the heat-conducting body 1 can be avoided. However, after the phase-change material is converted from the liquid state to the solid state, the volume of the phase-change material shrinks, the inside of the cavity is in a negative pressure state, and the external air pressure acts on the outer surface of the heat-conducting body 1, so that the heat-conducting body 1 is stressed. And prior art's heat conduction strengthening rib 2 plays anti inflation effect, need be connected heat conduction strengthening rib 2 and the side of cavity among the prior art promptly, at this moment, under the effect of pressure, the side junction of heat conduction strengthening rib 2 and cavity produces compressive stress, leads to the side of cavity and the junction of heat conduction strengthening rib 2 to produce the crackle easily for holistic structure suffers destruction, and holistic intensity descends promptly. In this embodiment, the heat conducting reinforcing ribs 2 are only arranged on the end surfaces of the cavity, so that cracks are prevented from being generated on the side surfaces of the cavity due to the action of pressure stress, and the overall strength of the phase change heat radiator is ensured.

In this embodiment, a vacuum infusion method is used to inject the liquid phase-change material into the cavity. Specifically, a pipe may be inserted into the air extraction hole, and the pipe is connected to a vacuum pump for extracting air from the cavity to form a vacuum in the cavity; meanwhile, another pipe is inserted into the liquid phase-change material filling hole, so that the phase-change material heated to the liquid state is filled into the cavity. After the liquid phase-change material is filled in the cavity, the liquid phase-change material filling hole and the air exhaust hole are respectively subjected to sealing treatment.

In addition, the selected phase-change material has the characteristics of high phase-change latent heat, small density, good phase-change reversibility, small volume change and the like. Under the missile-borne environment, alkane phase change materials such as paraffin are generally selected, the latent heat of phase change of the phase change materials can reach 160-250 kJ/kg, and the density of the phase change materials is only 0.8-0.9 g/cm³. Specifically, in the embodiment, the phase change material is made of a phase change material with a model number of RT90 manufactured by Rubitherm GmbH of Germany, and the phase change temperature of the material is 90 ℃.

Example 2

A phase change heat sink has a structure substantially the same as that of embodiment 1, and further, in order to facilitate filling the cavity with a liquid phase change material, in this embodiment, a first gap 3 is formed between the heat conduction rib 2 on one end surface of the cavity and the heat conduction rib 2 on the other end surface of the cavity, as shown in fig. 3. The interior of the cavity is interconnected everywhere by the first gap 3.

Example 3

The structure of the phase change heat radiator is basically the same as that of the embodiment 1, and further, the heat conduction reinforcing ribs 2 are in a grid shape, so that the strength of the end face of the cavity can be increased, and the bending deformation of the end face of the cavity can be avoided. In this embodiment, the grid shape may be a well shape, as shown in fig. 5; in addition, the mesh shape may be a honeycomb shape. Besides the grid shape, the heat conducting reinforcing ribs 2 can also adopt other shapes, such as a square-shaped shape and the like.

Example 4

A phase change heat sink having a structure substantially similar to that of embodiment 1, further comprising a second gap 4 between the heat conductive rib 2 and the side of the cavity, as shown in fig. 4. As described in embodiment 1, the phase change material is poured into the cavity in a liquid form, so that the thermal conductive body 1 can be prevented from being deformed due to expansion. However, after the phase-change material is converted from the liquid state to the solid state, the volume of the phase-change material shrinks, and in order to ensure the filling rate of the solid phase-change material in the cavity, a second gap 4 is arranged between the heat-conducting reinforcing rib 2 and the side surface of the cavity, and the external air pressure acts on the outer surface of the heat-conducting body 1, so that the side surface of the cavity can be sunken towards the inside of the cavity, the volume of the inside of the cavity is reduced, the filling rate of the solid phase-change material in the cavity is ensured, and the heat-conducting efficiency of the.

In order to make the sides of the cavity more easily concave, the outer surface of the heat conducting body 1 is provided with weight-reducing grooves 5 corresponding to the sides of the cavity, wherein the wall thickness of the heat conducting body 1 is thinner at the positions where the weight-reducing grooves 5 are provided. In this embodiment, the weight reduction grooves 5 are respectively disposed on the front side, the rear side, the left side and the right side of the heat conduction body 1, and the weight reduction grooves 5 penetrate from the upper end of the heat conduction body 1 to the lower end of the heat conduction body 1, so as to be beneficial to controlling the overall weight of the phase change heat sink.

Example 5

A phase change heat sink, whose structure is substantially the same as that of embodiment 1, further, the heat conducting body 1 includes a base 11 and a cover plate 12, as shown in fig. 5, the base 11 is a shell with a slot on one side; a cover plate 12 is packaged at the port of the groove, and the structure of the cover plate 12 is shown in figure 7; in the present embodiment, the heat conductive ribs 2 are respectively disposed on the bottom surface of the groove and one side surface of the cover plate 12.

In this embodiment, the liquid phase change material filling hole may be disposed on the cover plate 12, or may be disposed on the base 11; similarly, the air extraction holes can be arranged on the cover plate 12 and also can be arranged on the base body 11; in order to avoid the leakage of the phase-change material, the liquid phase-change material filling hole and the air suction hole are both positioned at the upper end of the heat conduction body 1. In the prior art, an opening is formed in the side face of the base body 11 and used for pouring the phase-change material, and lateral pressure generated by the phase-change material can act on the opening, so that leakage is easily generated.

In actual use, the other side of the cover plate 12 away from the cavity is provided with electronic components. The heat generated by the electronic components is transferred to the cover plate 12 and the heat conducting reinforcing ribs 2 in sequence and finally transferred to the phase-change material, so that the phase-change material absorbs heat and becomes liquid. In order to reduce the contact thermal resistance, a heat conduction layer is arranged between the electronic component and the cover plate 12, and in this embodiment, the heat conduction layer may be made of heat conduction silicone grease or a heat conduction pad.

Example 6

As shown in fig. 1, a phase change heat sink has a structure substantially the same as that of embodiment 1, and further, the heat conductive body 1 includes a base 11 and a cover plate 12, as shown in fig. 6, the base 11 is a ring-shaped housing; the two ends of the substrate 11 are respectively packaged with the cover plates 12, the structure of the cover plates 12 is shown in fig. 7, the heat conduction reinforcing ribs 2 are arranged on one side surface of the cover plates 12, the heat conduction reinforcing ribs 2 can be independently processed on one side surface of the cover plates 12 through machining, the operable space on the periphery of the cover plates 12 is large, and the processing is more convenient; here, electron beam welding is used between the base body 11 and the cover plate 12, and the sealing performance of the electron beam welding is good.

In order to make the overall structure more compact, in the present embodiment, the electronic components are distributed on the two cover plates 12, that is, the electronic components are respectively mounted on the other side surfaces of the two cover plates 12 away from the cavity. The common electronic components generally comprise a planar power amplifier, a driving plate and a power control board, wherein the planar final power amplifier and the driving plate are fixed on the upper side surface of a cover plate 12 positioned at the upper end of an annular shell through screws; the cover plate 12 located at the lower end of the annular shell is fixed with a power control board on the lower side surface through screws, and in order to reduce thermal contact resistance, a heat conduction layer is arranged between the electronic component and the cover plate 12, and in the embodiment, the heat conduction layer can be made of heat conduction silicone grease or a heat conduction pad. When power is supplied to the planar power amplifier, the planar power amplifier generates continuous heat loss in a short time and is converted into surface temperature, the surface temperature of the planar power amplifier rises sharply, the body and the heat-conducting reinforcing ribs 2 absorb heat and then rise in temperature, when the temperature reaches above 90 ℃, the phase-change material in the cavity is changed into a liquid form from a solid form, heat generated by the planar power amplifier is taken away, and the planar power amplifier is guaranteed to work normally within 9 minutes.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. A phase change heat sink, its characterized in that: including heat conduction body (1) and heat conduction strengthening rib (2), the inside confined cavity that is equipped with of heat conduction body (1), be equipped with liquid phase change material on heat conduction body (1) and pour into hole and aspirating hole, the cavity has two relative terminal surfaces and is located the side between the both ends face, and heat conduction strengthening rib (2) set up on the terminal surface of cavity.

2. The phase change heat sink of claim 1, wherein: a first gap (3) is arranged between the heat conduction reinforcing rib (2) on one end face of the cavity and the heat conduction reinforcing rib (2) on the other end face of the cavity.

3. The phase change heat sink of claim 1, wherein: the heat conduction reinforcing ribs (2) are in a grid shape.

4. The phase change heat sink of claim 1, wherein: and a second gap (4) is formed between the heat conduction reinforcing rib (2) and the side surface of the cavity.

5. The phase change heat sink of claim 4, wherein: the outer surface of the heat conduction body (1) is provided with a weight reduction groove (5) corresponding to the side surface of the cavity.

6. The phase change heat sink of claim 1, wherein: the heat conduction body (1) comprises a base body (11) and a cover plate (12), wherein the base body (11) is an annular shell, and the cover plate (12) is respectively packaged at two ends of the base body (11).

7. The phase change heat sink of claim 6, wherein: and electronic components are arranged on the two cover plates (12).

8. The phase change heat sink of claim 7, wherein: and a heat conduction layer is arranged between the electronic component and the cover plate (12).