CN217252053U

CN217252053U - Phase-change constant-temperature flattening device of ultrathin micro heat pipe

Info

Publication number: CN217252053U
Application number: CN202220888167.6U
Authority: CN
Inventors: 薛晓伟; 王利春; 项苏祺; 滕世政; 占利华; 雷琼; 项崭
Original assignee: Zhejiang Kangsheng Heat Exchanger Co ltd
Current assignee: Zhejiang Kangsheng Heat Exchanger Co ltd
Priority date: 2022-04-18
Filing date: 2022-04-18
Publication date: 2022-08-23
Anticipated expiration: 2032-04-18

Abstract

The utility model discloses a phase transition constant temperature flattening device of ultra-thin little heat pipe, including fixing the lower mould on the work platen, by the last mould of drive arrangement control to and temperature controller, heating power supply, characterized by the lower mould includes the constant temperature bottom plate and is located the mould board on the constant temperature bottom plate, go up in the mould be equipped with mould board complex constant temperature briquetting, the one end of constant temperature bottom plate is equipped with the stopper, through supporting spring connection between stopper and the work platen. The design of the constant temperature mould enables the saturated vapor pressure in the micro heat pipe to generate supporting force for the pipe wall, the phenomenon of surface collapse of the micro heat pipe in the forming process is avoided, the micro heat pipe is positioned on the plane in the whole deformation process, the workpiece is prevented from overturning, the position precision of the liquid absorption core is ensured, the design of each parameter enables the elastic-plastic change of the micro heat pipe to be in smooth transition, the elastic rebound and the forming are effectively restricted, and the product quality is ensured.

Description

Phase-change constant-temperature flattening device of ultrathin micro heat pipe

Technical Field

The utility model relates to a little heat pipe manufacturing technology, especially a phase transition constant temperature of ultra-thin little heat pipe flattens device.

Background

Along with the development of microelectronic and optoelectronic chips towards high integration and high performance, microelectronic and optoelectronic products are also continuously developing towards miniaturization, high integration and portability. At the same time, however, the heat flow density of microelectronic devices is increasing, and the heat flow density of high-performance microprocessors can reach as high as 100W/cm ² . For example, the thickness of a household notebook personal computer is as low as 11mm, the thickness of a micro projector can be smaller than 10mm, and the clearance for heat dissipation of a power lithium battery is only 2-3 mm. In order to meet the heat dissipation of miniature compact electronic equipment, the wall thickness of the ultrathin micro heat pipe is reduced to 0.15mm, the thickness of the flattened micro heat pipe is reduced to about 0.5-0.6 mm, the surface collapse phenomenon is serious in the plastic deformation process of the heat pipe in the forming process of the traditional flattening process, the phenomenon not only compresses an originally small steam channel of the ultrathin heat pipe and increases the flow resistance of a working medium, but also the surface collapse seriously reduces the surface flatness of the heat pipe, the heat pipe cannot be in good contact with a heat source or a heat sink in practical application, the surface contact thermal resistance is greatly increased, and the heat transfer performance of the heat pipe is reduced.

Disclosure of Invention

The utility model aims at solving the above problem, a phase transition constant temperature of ultra-thin little heat pipe flattens device is provided, utilizes under the heating condition the inside saturated vapor pressure of heat pipe to carry out the shaping to the holding power of pipe wall and supports, avoids the heat pipe to appear the surface phenomenon of collapsing flattening the forming process.

The above technical problem of the present invention can be solved by the following technical solutions: the utility model provides a phase transition constant temperature of ultra-thin little heat pipe flattens device, is including fixing the lower mould on the work platen, by last mould of drive arrangement control to and temperature controller, heating power supply, characterized by the lower mould includes constant temperature bottom plate and the mould board that is located on the constant temperature bottom plate, is equipped with in going up the mould with mould board complex constant temperature briquetting, the one end of constant temperature bottom plate is equipped with the stopper, passes through supporting spring between stopper and the work platen and is connected.

In the phase-change constant-temperature flattening device for the ultrathin micro heat pipe, the tube body accommodating groove of the micro heat pipe is preferably arranged on the die plate, the positioning groove matched with the mark marking body at the end part of the micro heat pipe is arranged on the limiting block, the bottom surface of the positioning groove is a plane, and the plane is matched with the mark marking body identification surface.

In the phase-change constant-temperature flattening device for the ultrathin micro heat pipe, preferably, the limiting block is provided with a spring height adjusting mechanism at the position where the supporting spring is assembled.

In the phase-change constant-temperature flattening device for the ultrathin micro heat pipe, preferably, the positioning groove of the limiting block is higher than the bottom surface of the pipe body accommodating groove in the die plate in the initial state of the supporting spring, and the height difference of the positioning groove is matched with the marking body of the micro heat pipe.

In the phase-change constant-temperature flattening device for the ultrathin micro heat pipe, preferably, the distance between the bottom surface of the stopper and the supporting surface of the workbench plate is equal to the maximum compressed size of the micro heat pipe.

In the phase-change constant-temperature flattening device of the ultrathin micro heat pipe, preferably, the working temperatures of the constant-temperature bottom plate and the constant-temperature pressing block are controlled by a heating system.

This technical scheme mainly is equipped with hydraulic power system, shaping module and heating system. The upper die and the lower die are respectively provided with a constant-temperature pressing block and a constant-temperature bottom plate which are controlled by a heating system, so that the saturated vapor pressure in the micro heat pipe in the whole flattening and forming process is ensured and controlled. Because of the special structure of the flattening workpiece micro heat pipe, the internal liquid absorption core has directionality, and therefore, one end of the constant temperature base plate is provided with a limiting block which has directionality positioning on the micro heat pipe, and the precision of the flattening direction of the micro heat pipe is ensured. The limiting block is provided with a plane positioning groove matched with the marking body at the end part of the micro heat pipe, and the bottom surface of the positioning groove is consistent with the identification surface of the marking body. And the limiting block is connected with the working table plate through the supporting spring, the positioning block is higher than the positioning plane of the tube body accommodating groove of the die plate by a certain height through adjusting the working length of the spring by the bolt, and the height difference of the positioning block is matched with the micro heat pipe marking body, so that the micro heat pipe is positioned on the plane in the whole deformation process, and the micro heat pipe is prevented from overturning.

Furthermore, the distance between the bottom surface of the limiting block and the supporting surface of the working table plate is equal to the maximum flattening size of the micro heat pipe, so that the micro heat pipe is subjected to timing pressure maintaining when being molded to the designed size, and the working medium in the micro heat pipe is ensured to be completely vaporized.

As a flattening forming technology of the micro heat pipe, the requirements on the depth and the flatness tolerance value of the pipe body accommodating groove must be optimized, parameters such as heating temperature, mold pressing speed and the like are optimized, and the transition of the elastic-plastic size change, elastic rebound, forming restriction and the like of the micro heat pipe are controlled.

Compared with the prior art, the beneficial effects of the utility model are that: the design of the constant temperature mould enables the saturated vapor pressure in the micro heat pipe to generate supporting force for the pipe wall, so that the phenomenon of surface collapse of the micro heat pipe in the forming process is avoided, meanwhile, the micro heat pipe is positioned on the plane in the whole deformation process, the workpiece is prevented from overturning, the position precision of the liquid absorption core is guaranteed, the design of each parameter enables the elastic-plastic change of the micro heat pipe to be in smooth transition, the elastic rebound and the forming are effectively restricted, and the product quality is guaranteed.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the connection structure between the limiting block and the working platen of the present invention.

Fig. 3 is a schematic view of an upper mold structure of the present invention.

Fig. 4 is a schematic diagram of a stopper structure of the present invention.

Fig. 5 is a schematic diagram of a mold plate structure of the present invention.

Fig. 6 is a structural diagram of the initial state of the micro heat pipe.

Fig. 7 is a schematic structural diagram of a heating system according to the present invention.

In the figure: 1. the heating device comprises a working table plate, 2 parts of a constant-temperature bottom plate, 3 parts of a die plate, 301 parts of a pipe body accommodating groove, 4 parts of a pressing plate, 5 parts of a top plate, 6 parts of a hydraulic cylinder, 7 parts of a limiting block, 701 parts of a positioning groove, 702 parts of a spring seat hole, 8 parts of a micro heat pipe, 9 parts of a supporting spring, 10 parts of a constant-temperature pressing block, 11 parts of a thermocouple, 12 parts of a heating rod, 13 parts of a temperature controller and 14 parts of a heating power supply.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

The phase-change constant-temperature flattening device for the ultrathin micro heat pipe is provided with a lower die fixed on a horizontal working table plate 1 as shown in fig. 1, wherein the lower die comprises a constant-temperature bottom plate 2 and a die plate 3 positioned above the constant-temperature bottom plate 2. An upper die is arranged corresponding to the lower die, the hydraulic cylinder 6 is controlled by a driving device for the upper die, a constant-temperature pressing block 10 matched with the die plate 3 is arranged in the upper die, and the constant-temperature pressing block 10 is positioned on the piston of the hydraulic cylinder 6 through a pressing plate 4, as shown in figure 3. The table plate 1 is connected to a top plate 5 arranged in parallel thereto via 4 upright posts arranged at four corners, and a hydraulic cylinder 6 is fixed to the top plate 5.

In this embodiment, a temperature controller 13 and a dc heating power supply 14 are configured, as shown in fig. 7, a heating rod 12 is disposed in a constant temperature bottom plate 2 on a work table plate 1, the temperature of the constant temperature bottom plate 2 is controlled by a heating system, a T-type thermocouple 11 can be used to measure the temperature of a micro heat pipe 8 of a workpiece in real time, and the thermocouple 11 is connected to the temperature controller 13.

Further referring to fig. 2, 4 and 5, a limiting block 7 is arranged at one end of the constant temperature base plate 2, and the limiting block 7 is connected with the working table plate 1 through a supporting spring 9. Be equipped with the body holding tank 301 of little heat pipe 8 on the mould board 3, be equipped with on the stopper 7 with 8 tip of little heat pipe beat mark body complex constant head tank 701, wherein constant head tank bottom surface 701 is the plane, this plane with beat mark body sign face cooperation. The limiting block 7 is provided with a spring height adjusting mechanism at the position where the supporting spring 9 is assembled, the mechanism is composed of an adjusting bolt and the supporting spring 9, the limiting block 7 is provided with a spring seat hole 702, and the adjusting bolt and the supporting spring 9 are positioned in the spring seat hole 702.

Under the initial state of the supporting spring 9, the height of the positioning groove 701 of the limiting block 7 is higher than the bottom surface of the pipe body accommodating groove 301 in the mold plate 3, and the height difference of the positioning groove 701 is matched with the marking body of the micro heat pipe 8. Generally, the height difference is the diameter of the micro heat pipe minus the retraction height of the marking surface of the marking body on one side, and further, the distance between the bottom surface of the limiting block 7 and the supporting surface of the working table plate 1 is equal to the maximum flattened size of the micro heat pipe 8.

The following description of the working process is made in conjunction with the setting of the device composition parameters:

the heating rod 12 is controlled by the direct current heating power supply 14, the heating temperature is set to 200 ℃, the T-shaped thermocouple is used for measuring the temperature of the outer surface of the micro heat pipe 8, when the surface temperature of the micro heat pipe 8 reaches the set temperature, the direct current heating power supply 14 stops heating the heating rod 12, the temperature is maintained through a constant temperature program, and the heating error is kept within 1 ℃. The groove depth of body holding tank 301 is 0.6mm, and body holding tank 301's plane degree tolerance value is 0.02 mm. In the flattening process, the constant-temperature pressing block 10 extrudes the micro heat pipe 8, and the positioning block 7 and the micro heat pipe 8 move downwards simultaneously under the action of pressure until the positioning block is contacted with the supporting surface of the working table plate 1.

The specific operation steps are as follows:

firstly, a temperature control instrument and a heating power supply are opened, the heating temperature is set to be 200 ℃, meanwhile, feeding is carried out, the height of the positioning block 7 and the position of the micro heat pipe 8 are adjusted, as shown in fig. 6, the micro heat pipe 8 to be flattened is placed in the die plate 3, and the positioning surface of the marking body of the micro heat pipe 8 is pushed to the bottom of the notch of the limiting block 7.

Then, after the surface temperature of the micro heat pipe 8 reaches the set temperature, a power button of the hydraulic cylinder 6 is pressed down, the constant temperature pressing block 10 moves downwards to extrude the pipe body at the speed of 10mm/s, and the pressure is maintained for 10 seconds at the final flattening position of the micro heat pipe 8, so that the working medium in the micro heat pipe 8 is completely vaporized, and the stability of flattening forming is ensured.

After the working medium in the micro heat pipe 8 is completely vaporized, the constant temperature pressing block 10 is continuously pressed until the micro heat pipe 8 is completely molded, and the bottom surface of the limiting block 7 is flush with the supporting surface of the working table plate 1. And finally, moving the constant-temperature pressing block 10 upwards and blanking.

The above-mentioned embodiment is to the description of the present invention, not to the limitation of the present invention, and the micro heat pipe is any right the structure after the simple transformation of the present invention all belongs to the protection scope of the present invention.

Claims

1. The utility model provides a phase transition constant temperature of ultra-thin little heat pipe flattens device, is including fixing the lower mould on work platen (1), by last mould of drive arrangement control to and temperature controller, heating power supply, characterized by the lower mould includes constant temperature bottom plate (2) and is located mould board (3) on the constant temperature bottom plate, go up in the mould be equipped with mould board complex constant temperature briquetting (10), the one end of constant temperature bottom plate is equipped with stopper (7), is connected through supporting spring (9) between stopper and the work platen.

2. The phase-change constant-temperature flattening device for the ultrathin micro heat pipe as claimed in claim 1, wherein the die plate (3) is provided with a pipe body accommodating groove (301) for the micro heat pipe (8), the limiting block (7) is provided with a positioning groove (701) matched with the marking body at the end of the micro heat pipe, the bottom surface of the positioning groove is a plane, and the plane is matched with the marking surface of the marking body.

3. The phase-change constant-temperature flattening device for the ultrathin micro heat pipe as claimed in claim 1 or 2, wherein the limiting block (7) is provided with a spring height adjusting mechanism at the position where the supporting spring (9) is assembled.

4. The phase-change constant-temperature flattening device for the ultrathin micro heat pipe as claimed in claim 2, wherein in the initial state of the supporting spring (9), the height of the positioning groove (701) of the limiting block (7) is higher than the bottom surface of the pipe body accommodating groove (301) in the die plate (3), and the height difference of the positioning groove is matched with the marking body of the micro heat pipe (8).

5. The phase-change constant-temperature flattening device for the ultrathin micro heat pipe as claimed in claim 1, wherein the distance between the bottom surface of the limiting block (7) and the supporting surface of the working table plate (1) is equal to the maximum compressed size of the micro heat pipe (8).

6. The phase-change constant-temperature flattening device for the ultrathin micro heat pipe as claimed in claim 1, wherein the working temperatures of the constant-temperature bottom plate (2) and the constant-temperature pressing block (10) are controlled by a heating system.