Automatic degassing and liquid filling packaging tooling for aluminum flat plate heat pipe and its process method

Abstract

The present invention discloses an automatic degassing and liquid filling packaging tool for an aluminum flat heat pipe and a process method thereof, which is characterized in that the flat heat pipe is horizontally placed on a workbench, and the liquid filling port of the flat heat pipe is limited; the flat heat pipe is vacuumed by a vacuum pump through a sealing quick joint in conjunction with the liquid filling port of the flat heat pipe, and is filled with refrigerant liquid; while stopping the refrigerant liquid filling, a press-fit primary seal is performed through an integrated module; the integrated module is continued to be used for ultrasonic welding secondary seal; the integrated module is continuously used to press down the process pipe at the end of the liquid filling port of the flat heat pipe; the sealing quick joint is opened to remove the process pipe. The actions of vacuuming, liquid filling, sealing welding, and pipe cutting are completed at the same station at one time, and the vacuum degree and refrigerant filling amount are stable and controllable, thereby avoiding the refrigerant leakage phenomenon, and the refrigerant filling amount inside the sealed workpiece is constant, thereby realizing automated production and large-scale application.

Description

Technical Field

[0001] The invention relates to a radiator heat pipe manufacturing technology, in particular to an automatic degassing and liquid-filling packaging tool for an aluminum flat plate heat pipe and a process method thereof. Background Art

[0002] Flat heat pipes are widely used in various heat exchange devices due to their high thermal conductivity, variability of heat flux density, excellent isothermal properties, reversibility of heat flow direction, structural adaptability and other characteristics. They are especially widely used in the heat dissipation of components such as baseband processing units, centralized units and distributed units in 5G base stations. Flat heat pipes are in the shape of a flat plate, which is very conducive to heat diffusion of concentrated heat sources. In addition, due to their light weight and good startability, they have become a hot research topic in the heat dissipation of electronic components. Improvements in structure and processing methods, parameter optimization, internal flow and heat transfer, capillary limit and boiling limit are all important research objects. Among them, the liquid filling and degassing process is a key technology that determines the heat transfer performance of flat heat pipes. The performance of different vacuum degrees and working liquid filling amounts also varies greatly. Therefore, vacuum degree and liquid filling amount are important factors affecting the performance of flat heat pipes. In the disclosed technology, various different filling methods are used according to the different structures of the flat heat pipe, such as the patent publication number CN108955328A, an independent parallel multi-channel flat heat pipe working medium filling system and its filling method, the filling system includes a working medium tank, a quantitative system, a constant temperature common cavity, a flat heat pipe, a variable temperature system, a vacuum system and a sealing system, and control valves are provided between the quantitative system and the constant temperature common cavity, and between the constant temperature common cavity and the vacuum system. During filling, the non-condensable gas inside the pipeline system and the flat heat pipe is first extracted, and then the high-temperature and high-pressure working medium steam is filled into the flat heat pipe through the quantitative system. When the temperature and pressure vapor-liquid phase equilibrium is reached, the working medium in the parallel multi-channel flat heat pipe is in a vapor-liquid coexistence state. At this time, one end of the parallel multi-channel flat heat pipe is sealed by a sealing mechanism to make an independent parallel multi-channel flat heat pipe. Another example is a vacuuming, liquid-filling and sealing device for a flat multi-channel heat pipe designed with patent publication number CN108709442A, which includes a vacuum chamber connected to a vacuum valve, a quantitative liquid-filling pump, a liquid-filling plate and a sealing mold. A cavity is arranged in the liquid-filling plate, one end of which is provided with a liquid inlet connected to the quantitative liquid-filling pump, and the other end is provided with a plurality of liquid-filling holes which are the same in number and position as the channels of the flat heat pipe and correspond to each other. The liquid inlet is connected to the quantitative liquid-filling pump through a pipeline, and one end provided with the liquid-filling holes vertically extends from the upper end of the vacuum chamber into the vacuum chamber in a sealing manner, and a sealing socket for the flat heat pipe to be injected to extend into the vacuum chamber in a sealing manner is relatively arranged at the lower end of the vacuum chamber. The sealing mold is arranged in the vacuum chamber and on both sides of the flat heat pipe.

[0003] The existing technology often fails to completely seal the mechanical pre-seal. During the process of pipe cutting and manual argon arc welding, the refrigerant will leak naturally to varying degrees, seriously affecting the stability of the refrigerant filling amount. In some cases, even the refrigerant filling amount inside the sealed workpiece cannot be detected, causing great quality risks. With the rapid development of optical / electronic chips, especially 5G communications, higher requirements are placed on the stability and performance of flat heat pipes, and it is hoped that they can achieve automated production to meet large-scale applications to reduce application costs. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and to provide an automatic degassing and liquid filling packaging tooling and a process method for an aluminum flat heat pipe, which has the characteristics of stable and controllable workpiece vacuum degree and liquid filling amount, and one-time sealing.

[0005] The above technical problem of the present invention is mainly solved by the following technical solution: an automatic degassing and liquid filling packaging process for an aluminum flat plate heat pipe, the characteristics of which include the following contents.

[0006] (1) Place the flat heat pipe horizontally on the workbench and limit the filling port of the flat heat pipe.

[0007] (ii) The sealed quick connector cooperates with the liquid filling port of the flat plate heat pipe, and the flat plate heat pipe is vacuumed by a vacuum pump and filled with refrigerant liquid.

[0008] (3) While stopping the refrigerant liquid filling, the first press-fit sealing is performed through the integrated module.

[0009] (IV) Continue to use the integrated module for secondary sealing by ultrasonic welding.

[0010] (V) Continuously use the integrated module to perform downward pressure cutting on the process tube at the end of the flat heat pipe filling port.

[0011] (6) Open the sealed quick connector and remove the process pipe.

[0012] In the aforementioned automatic degassing and liquid-filling packaging process for the aluminum flat plate heat pipe, preferably, the sealing quick connector has a conical positioning nozzle and is provided with an elastic stripping mechanism.

[0013] In the aforementioned automatic degassing and liquid-filling packaging process for the aluminum flat heat pipe, preferably, all actions of the sealing quick connector, vacuum pump, filling machine and integrated module are automatically completed through a control program.

[0014] In the aforementioned automatic degassing and liquid filling packaging process of the aluminum flat heat pipe, preferably, the vacuum pump working pipeline is equipped with a vacuum index regulating device, and the refrigerant liquid filling pipeline is equipped with a pressure index regulating device.

[0015] An automatic degassing, liquid-filling and packaging tool for an aluminum flat-plate heat pipe comprises a vacuum pump, a filling machine, a welding machine and a workbench for placing and positioning the flat-plate heat pipe. The tool is characterized in that an integrated module is provided above the workbench at the filling port of the flat-plate heat pipe, and a sealing quick connector is provided vertically to the integrated module, and the sealing quick connector is connected to the vacuum pump and the filling machine.

[0016] The integrated module comprises a sealing head, an upper welding electrode and a cutter which are arranged vertically downward in parallel, and a lower welding electrode is arranged on the workbench corresponding to the upper welding electrode; the sealing head, the upper welding electrode and the cutter are respectively controlled by separate cylinders.

[0017] In the aforementioned automatic degassing and liquid-filling packaging process for the aluminum flat plate heat pipe, preferably, a lower knife seat is provided on the workbench corresponding to the cutting knife, and the lower knife seat is in close contact with the lower welding electrode.

[0018] In the aforementioned automatic degassing and liquid-filling packaging process for the aluminum flat heat pipe, preferably, the sealing head, the upper welding electrode, and the cutting knife are respectively limited in their respective movement directions by guide sleeves.

[0019] In the aforementioned automatic degassing and liquid filling packaging process of the aluminum flat heat pipe, preferably, the sealed quick connector input pipe is divided into two paths, one path through the pressure gauge and the filling valve to the filling machine, and the other path through the vacuum gauge and the vacuum valve to the vacuum pump.

[0020] In the aforementioned automatic degassing and liquid-filling packaging process for the aluminum flat heat pipe, preferably, the integrated module includes a shell, and the guide sleeve is fixed in the shell; the sealing head and the cutter are connected to their respective cylinders through a connecting rod mechanism.

[0021] This technical solution is designed for the flat heat pipe's own structural characteristics and theoretical filling requirements. The flat heat pipe is positioned based on a flat workbench. First, it meets the characteristics of the assembly line operation. At the same time, the single filling port of the flat heat pipe is specially limited to achieve the purpose of executing all steps at the same station. These steps include vacuum extraction of the flat heat pipe by a vacuum pump, filling with refrigerant liquid when the set vacuum requirement is reached, and stopping filling when the refrigerant liquid pressure reaches the set requirement. Both actions are performed by the sealing quick connector in conjunction with the flat heat pipe filling port, and the reversing is controlled by the pipeline control valve (i.e., the vacuum valve and the filling valve). Then, while stopping the refrigerant liquid filling, the next set of steps are performed through the design of the integrated module, that is, the first press-fitting seal is performed first, followed by the ultrasonic welding secondary seal, and then the process pipe at the end of the flat heat pipe filling port is cut off. The whole action is completed in one go and can be completed by the action time design of the power drive (cylinder), completing the filling, sealing and product molding under the premise of ensuring the high vacuum degree of the product.

[0022] Furthermore, the sealing quick connector has a conical positioning nozzle to quickly position the liquid filling port of the flat heat pipe in the coaxial direction. Of course, the sealing device is included. The device is also provided with an elastic stripping mechanism. When the sealing quick connector is opened, the process pipe is immediately removed by the elastic stripping mechanism. All action modules of this process are automatically completed by the control program to achieve automation and mass production.

[0023] Structurally, this solution is designed based on the principles of accurate positioning, orderly sequence, one-time completion, and simple and easy control. In addition to conventional power components, innovative designs are mainly made on the control system and the integrated module. The integrated module is directly set above the flat heat pipe filling port, and forms two mutually perpendicular operating positions with the sealed quick connector, which do not interfere with each other and the operating process is clear. The three functional devices of the integrated module are arranged vertically downward in parallel, and the corresponding functional bodies are respectively set on the workbench, and sequential actions are obtained through separate cylinder control. The interval time, pressure, movement speed, and working process time of this sequential action can all be set according to the actual material and product model.

[0024] Furthermore, in this solution, since the sealing head, upper welding electrode, and cutter are a unified body, in addition to being limited by the guide sleeve to limit their respective movement directions, they can also exist in the form of slide rails, dovetail grooves, etc. to improve the movement accuracy and overall stability. For the integrated module, since the three functional devices are independently moved, the three drives cannot be arranged in parallel, so the kinetic energy transfer between the drive mechanism and the functional device is realized by designing a connecting rod mechanism in this solution.

[0025] Compared with the prior art, the beneficial effects of the present invention are: vacuuming, liquid filling, sealing welding, pipe cutting and other actions are automatically completed at the same workstation at one time, the vacuum degree and refrigerant filling amount are stable and controllable, the continuous double sealing process avoids refrigerant leakage, the refrigerant filling amount inside the sealed workpiece is constant, and automated production and large-scale application are realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 , Figure 2 It is a schematic diagram of the arrangement and unified state structure of a functional device of the present invention.

[0027] Figure 3 A schematic diagram of the arrangement structure of an integrated module and a sealed quick connector of the present invention.

[0028] Figure 4 yes Figure 3 A partial enlarged schematic diagram of .

[0029] Figure 5 It is a process flow diagram of the present invention.

[0030] Figure 6It is the electrical control diagram of the present invention.

[0031] In the figure: 1. workbench, 2. vacuum valve, 3. vacuum gauge, 4. sealing quick connector, 5. pressure gauge, 6. filling valve, 7. integrated module, 701. shearing cylinder, 702. welding cylinder, 703. sealing cylinder, 704. cutter, 705. lower welding electrode, 706. upper welding electrode, 707. sealing head, 708. shell, 709. guide sleeve, 8. flat heat pipe. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0033] This embodiment provides an automatic degassing and liquid-filling packaging process for an aluminum flat plate heat pipe, including the following aspects:

[0034] (i) Place the flat heat pipe 8 (product) horizontally on a workbench 1, on which a movable positioning block is provided to limit the liquid filling port of the flat heat pipe 8.

[0035] (ii) The sealing quick connector 4 with a conical positioning nozzle cooperates with the liquid filling port of the flat plate heat pipe 8 to seal, and the flat plate heat pipe 8 is vacuum-drawn by a vacuum pump and filled with refrigerant liquid.

[0036] (iii) While stopping the refrigerant liquid filling, the sealing head 707 in the integrated module 7 is used to perform a press-fit primary sealing.

[0037] (iv) Keep the sealing head 707 in position unchanged, and continue to use the upper welding electrode 706 in the integrated module 7 to cooperate with the lower welding electrode 705 on the workbench to perform ultrasonic welding for secondary sealing.

[0038] (V) Keeping the sealing head 707 and the upper welding electrode 706 in the same position, the cutter 704 in the integrated module 7 is continuously used to perform downward pressure cutting on the process tube at the end of the liquid filling port of the flat heat pipe.

[0039] (6) Open the sealed quick connector and remove the process pipe.

[0040] An automatic degassing and liquid filling packaging tool for aluminum flat plate heat pipes, see Figure 1 , Figure 2, including a vacuum pump, a precision filling machine, an ultrasonic welding machine, and a workbench 1 for placing and positioning a flat heat pipe 8, and a one-in-one module 7 is provided above the workbench 1 located at the filling port of the flat heat pipe 8; a horizontally arranged sealing quick connector 4 is provided perpendicular to the one-in-one module 7, and the sealing quick connector 4 has a conical positioning nozzle, which cooperates with the filling port of the flat heat pipe 8, and an elastic stripping mechanism is also provided on the sealing quick connector 4, and the elastic stripping mechanism includes a spring, when the sealing quick connector 4 is sealed with the filling port of the flat heat pipe 8, the spring is compressed, and when the sealing quick connector 4 is opened, the spring is naturally expanded; the sealing quick connector is connected with the vacuum pump and the filling machine to form a circuit for vacuuming and filling refrigerant liquid. Among them, a vacuum gauge 3 with a vacuum index regulating device is provided in the working pipeline of the vacuum pump, and a pressure gauge 5 with a pressure index regulating device is provided in the refrigerant liquid filling pipeline, that is, the input pipe of the sealing quick connector 4 is divided into two routes: one route is through the pressure gauge 5 and the filling valve 6 to the precision filling machine, and the other route is through the vacuum gauge 3 and the vacuum valve 2 to the vacuum pump.

[0041] The basic structure of the integrated module 7 is as follows Figure 3 , Figure 4 As shown, it includes a shell 708, in which a sealing head 707, an upper welding electrode 706 and a cutter 704 are arranged vertically downward in parallel. The sealing head 707, the upper welding electrode 706 and the cutter 704 are respectively controlled by separate cylinders, that is, they are respectively controlled by a shearing cylinder 701, a welding cylinder 702 and a sealing cylinder 703 fixed on the shell 708. The up and down movements of the three-functional apparatus of the sealing head 707, the upper welding electrode 706 and the cutter 704 are also respectively limited by the guide sleeve 709 fixed in the shell to limit their respective movement directions. Since the sealing head 707, the upper welding electrode 706 and the cutter 704 are arranged in close contact and mutually guided, the upper welding electrode 706 located in the middle position can be directly driven by the welding cylinder 702, and the sealing head 707 and the cutter 704 located on both sides are respectively connected to the sealing cylinder 703 and the shearing cylinder 701 through their respective connecting rod mechanisms.

[0042] On the workbench 1 , a lower welding electrode 705 is provided corresponding to the upper welding electrode 706 , and a lower knife seat is provided corresponding to the cutter 704 . The lower knife seat is arranged closely to the lower welding electrode 705 .

[0043] In addition, in the integrated module 7, the sealing head 707 and the upper welding electrode 706, and the upper welding electrode 706 and the cutter 704 are tightly fitted to each other along the direction of movement. This fitting method can adopt structures such as dovetail grooves or parallel groove keys to ensure the matching accuracy between the moving parts.

[0044] All the actions of the above-mentioned sealing quick connector 4, vacuum pump, precision filling machine and integrated module 7 are automatically completed through the control program. The process flow and electrical control diagram are as follows: Figure 5 , Figure 6 shown.

[0045] The electrical control system uses Mitsubishi FX1s-20MR PLC module, which is a basic machine suitable for small-scale control. It has low cost and small installation space. It is small and has high performance and communication and other expandability. It can also be installed with display module FX1N-5DM, which can monitor and edit timers, counters and data registers, etc. The circuit system belongs to the conventional control circuit, so it will not be described here.

[0046] During operation, for products of the same batch, the size is the same. By adjusting the positioning block on the workbench 1, the flat heat pipe 8 and the filling port can be quickly positioned. At the same time, the sealing quick connector 4 is used to insert and seal the filling port of the flat heat pipe 8, and then the vacuum valve 2 is opened, and the vacuum pump is used to vacuum the flat heat pipe 8. When the vacuum degree reaches the set value, the filling valve 6 is opened to fill the refrigerant liquid. When the pressure reaches the set value, the filling valve is closed, and then the initial press-fit sealing is performed, followed by the secondary ultrasonic welding sealing, and the process pipe at the outer end of the filling port of the flat heat pipe 8 is cut off. Finally, the sealing quick connector 4 is opened, and the process pipe is automatically removed by the elastic stripping mechanism.

[0047] The above embodiments are for explanation of the present invention, not for limitation of the present invention. For example, after the initial sealing, the sealing head 707 can return to the initial position, and then ultrasonic welding can be performed for secondary sealing, etc. Any process, method, structure, etc. that are simply transformed from the present invention shall fall within the protection scope of the present invention.

Claims

1. An automatic degassing and liquid filling packaging process for an aluminum flat plate heat pipe, the characteristics of which include the following: (1) placing the flat heat pipe (8) horizontally on the workbench (1) and limiting the liquid filling port of the flat heat pipe; (ii) the sealing quick connector (4) cooperates with the liquid filling port of the flat plate heat pipe, and uses a vacuum pump to vacuum the flat plate heat pipe and fill it with refrigerant liquid; (iii) while stopping the refrigerant liquid filling, a press-fitting primary seal is performed through the integrated module (7); (iv) Continue to use the integrated module for secondary sealing by ultrasonic welding; (V) Continuously use the integrated module to perform downward pressure cutting on the process pipe at the end of the liquid filling port of the flat heat pipe; (6) Open the sealed quick connector and remove the process pipe.

2. The automatic degassing and liquid filling packaging process for aluminum flat plate heat pipes according to claim 1 is characterized in that: The sealing quick connector (4) has a conical positioning nozzle and is provided with an elastic stripping mechanism.

3. The automatic degassing and liquid filling packaging process for aluminum flat plate heat pipe according to claim 1 is characterized in that: All actions of the sealing quick connector, vacuum pump, filling machine and integrated module are automatically completed through the control program.

4. The automatic degassing and liquid filling packaging process for aluminum flat plate heat pipe according to claim 1, characterized in that: The vacuum pump working pipeline is equipped with a vacuum index regulating device, and the refrigerant liquid filling pipeline is equipped with a pressure index regulating device.

5. An automatic degassing and liquid filling packaging tool for an aluminum flat heat pipe, comprising a vacuum pump, a filling machine, a welding machine, and a workbench (1) for placing and positioning the flat heat pipe (8), characterized in that A combined module (7) is provided above the workbench located at the liquid filling port of the flat heat pipe, and a sealing quick connector (4) is provided vertically to the combined module, and the sealing quick connector is connected to a vacuum pump and a filling machine; The integrated module comprises a sealing head (707), an upper welding electrode (706) and a cutter (704) arranged vertically downward in parallel, and a lower welding electrode (705) is arranged on the workbench corresponding to the upper welding electrode; the sealing head, the upper welding electrode and the cutter are respectively controlled by separate cylinders.

6. The automatic degassing and liquid-filling packaging tool for the aluminum flat heat pipe according to claim 5, characterized in that: On the workbench, a lower knife seat is provided corresponding to the cutting knife (704), and the lower knife seat is in close contact with the lower welding electrode (705).

7. The automatic degassing and liquid-filling packaging tool for aluminum flat plate heat pipe according to claim 5 is characterized in that: The sealing head (707), the upper welding electrode (706), and the cutting knife (704) are respectively limited in their respective movement directions by guide sleeves (709).

8. The automatic degassing and liquid-filling packaging tool for aluminum flat plate heat pipe according to claim 5 is characterized in that: The input pipe of the sealing quick connector (4) is divided into two paths, one path passes through a pressure gauge (5) and a filling valve (6) to the filling machine, and the other path passes through a vacuum gauge (3) and a vacuum valve (2) to the vacuum pump.

9. The automatic degassing and liquid-filling packaging tool for the aluminum flat heat pipe according to claim 7, characterized in that: The integrated module (7) comprises a housing (708), a guide sleeve (709) fixed in the housing; the sealing head (707) and the cutter (704) are connected to their respective cylinders via a connecting rod mechanism.

10. The automatic degassing and liquid-filling packaging tool for the aluminum flat heat pipe according to claim 5, characterized in that: In the integrated module (7), the sealing head (707) and the upper welding electrode (706), and the upper welding electrode and the cutting knife (704) are closely fitted to each other along the moving direction.

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