CN114812244A - Temperature-uniforming plate with high material utilization rate and processing method thereof - Google Patents

Abstract

The present application provides a high material utilization temperature chamber and a processing method thereof. The temperature chamber includes an upper cover plate, a lower cover plate, a capillary structure and an independent capillary support structure, and the upper cover plate is provided with degassing and liquid injection holes ; The lower cover plate and the upper cover plate are welded to form a boss cavity and a convex rib cavity, the boss cavity is connected with the convex rib cavity, the degassing liquid injection hole is connected with the convex rib cavity, and the convex rib is connected with the convex rib cavity. The cavity body is squeezed and sealed in the pressure bonding area, and the pressure bonding area is located between the degassing liquid injection hole and the boss cavity; the capillary structure is attached to the lower surface of the upper cover plate and the upper surface of the lower cover plate; independent capillary support The structure is arranged in the cavity of the boss and connected with the capillary structure; the phase change medium exists in the cavity of the boss. The present application forms a complete degassing structure through the degassing and liquid injection holes and the rib-shaped cavity, and does not require the degassing pipe of the degassing structure of the traditional temperature equalizing plate, and thus does not require high-frequency sealing welding or glue dispensing at the root of the exhaust pipe, and does not require cutting Cut, improve the material utilization rate and reduce the processing cost.

Description

A kind of high material utilization rate uniform temperature plate and its processing method

technical field

The invention relates to heat dissipation technology, in particular to a high material utilization rate temperature chamber and a processing method thereof.

Background technique

As the most powerful heat transfer element in the current heat dissipation industry, the vapor chamber has a thermal conductivity hundreds of times that of pure copper, and transfers heat through the vapor and liquid phase changes of the circulating medium in the fully enclosed vacuum chamber. Widely used in electronics, communications, automotive, lighting and other industries.

The main structure of the uniform temperature plate is composed of five parts: the upper cover plate, the lower cover plate, the capillary structure, the support structure and the phase change medium. The upper cover plate, the lower cover plate and the support structure are combined into a closed cavity that can withstand atmospheric pressure without deformation. The cavity is a relatively vacuum gaseous phase change medium and liquid phase change medium negative pressure environment, and the liquid phase change medium at the heat source absorbs The heat vaporizes into a gaseous phase change medium, moves to the remote negative pressure condensation zone and gradually releases the latent heat to become a liquid phase change medium, and then returns to the heat source through the capillary structure to achieve the purpose of heat transfer over and over again. It can be seen from the working principle of the above vapor chamber that a better vacuum degree can reduce the working temperature of the vaporization of the phase change medium, thereby reducing the impedance and improving the performance. The degassing and liquid injection process of the uniform temperature plate is the key, and the structural design of the uniform temperature plate related to the quality of the degassing and liquid injection is particularly important.

The traditional degassing and liquid injection structure of the uniform temperature plate is designed as an open opening on the edge side of the lower cover, wrapping the degassing pipe. Liquid injection and post-sealing. This liquid injection and degassing structure follows the liquid injection and degassing method of the linear heat pipe. There is a waste of upper and lower cover sheet metal materials, waste of degassing pipe material, additional secondary solder or glue sealing process, and residual air in the capillary structure of the uniform temperature plate that affects performance is not easy to be removed by surface tension, and must be carried out. Disadvantages of secondary heating and degassing.

As the vapor chamber has gradually become the mainstream functional component in the heat dissipation industry, a new structural design is urgently needed for liquid injection and degassing of the vapor chamber to solve the above problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a high material utilization rate uniform temperature plate and a processing method thereof. By changing the degassing and liquid injection structure and process, the material utilization rate is improved, and the primary degassing effect at room temperature is improved, and there is basically no need for secondary degassing. Heating and degassing.

A brief summary of one or more aspects is given below to provide a basic understanding of the aspects. This summary is not an exhaustive overview of all contemplated aspects and is neither intended to identify key or critical elements of all aspects nor attempt to delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

According to an aspect of the present invention, there is provided a vapor chamber with high material utilization rate, comprising:

an upper cover plate, the upper cover plate is provided with a degassing and liquid injection hole;

a lower cover plate, the lower cover plate and the upper cover plate are welded to form a boss cavity and a rib-shaped cavity, the boss cavity is communicated with the rib-shaped cavity, and the degassing The liquid injection hole is communicated with the convex rib cavity, and the convex rib cavity is squeezed and sealed in the pressure bonding area, and the pressure bonding area is located between the degassing liquid injection hole and the boss cavity. between;

a capillary structure attached to the lower surface of the upper cover plate and the upper surface of the lower cover plate;

an independent capillary support structure disposed in the boss cavity and connected with the capillary structure; and

A phase change medium exists in the boss cavity.

In one embodiment, the pressure bonding area is located at the rear end of the rib-shaped cavity close to the boss cavity.

In one embodiment, the cross-sectional width of the rib-shaped cavity is 1 mm˜3 mm, and the height of the rib-shaped cavity is 0.2 mm˜1.2 mm.

In one embodiment, the diameter of the degassing and liquid injection holes is 1 mm˜3 mm.

In one embodiment, the degassing and liquid injection holes and the rib-shaped cavity are arranged at the corners or sides of the high material utilization rate temperature equalizing plate.

In one embodiment, the upper cover plate and the lower cover plate are further provided with positioning holes, and the positioning holes are opened on both sides of the rib-shaped cavity.

According to another aspect of the present invention, a method for processing a vapor chamber is provided, comprising the following steps:

Sintering the upper cover plate and the upper capillary structure into an assembly;

Sintering the lower cover, the lower capillary structure and the independent capillary support structure into an assembly;

Combining the upper cover plate and the lower cover plate to form a boss cavity and a convex rib cavity;

Use degassing and liquid injection equipment to pump the boss cavity into negative pressure from the degassing and liquid injection hole, and the negative pressure value is ≤1pa;

The phase change medium in the degassing and liquid injection equipment is sucked into the chamber of the uniform temperature plate by the negative pressure of the cavity, and the injection amount is controlled by the flow meter;

Press and seal the pressure bonding area of the rib cavity.

In one embodiment, when the pressure bonding area of the rib cavity is pressed and sealed, the pressure bonding area is squeezed and deformed to 90%-95% of the total thickness of the upper cover plate and the lower cover plate.

In one embodiment, after the pressure bonding area of the rib cavity is squeezed and sealed, the method further includes: performing secondary sealing by pressure resistance welding, ultrasonic welding or laser welding.

In one embodiment, before using the degassing and liquid injection equipment to pump the boss cavity into negative pressure, the upper cover plate and the degassing and liquid injection equipment are matched with each other through the positioning holes on the upper cover plate.

The beneficial effect of the embodiment of the present invention is that: a complete degassing structure is formed through the degassing and liquid injection holes and the rib-shaped cavity, and the degassing pipe of the traditional uniform temperature plate degassing structure is not required, and thus the high-frequency sealing welding of the root of the gas extraction pipe is not required. Or dispensing, there is no need to cut, which improves the utilization rate of materials, simplifies the operation process, and reduces the processing cost.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

The above-described features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale and components with similar related characteristics or features may have the same or similar reference numbers.

1 is a schematic bottom view of Embodiment 1 of the present application;

Fig. 2 is A-A cross-sectional schematic diagram in Fig. 1;

3 is a schematic top view of Embodiment 1 of the present application;

Fig. 4 is the bottom view schematic diagram of the second embodiment of the present application;

Fig. 5 is B-B sectional schematic diagram in Fig. 4;

6 is a schematic top view of Embodiment 2 of the present application;

Among them: 1- upper cover plate; 11- degassing liquid injection hole; 2- lower cover plate; 3- capillary structure; 4- independent capillary support structure; 5- boss cavity; 6- rib cavity; 7 - Pressure bonding area; 8 - Positioning holes.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary, and should not be construed as any limitation to the protection scope of the present invention.

As shown in FIG. 1 to FIG. 3 , the first embodiment of the present application provides a high material utilization temperature uniform plate, including: an upper cover plate 1 , a lower cover plate 2 , a capillary structure 3 , an independent capillary support structure 4 and a phase change medium.

Wherein, the upper cover plate 1 is provided with a degassing and liquid injection hole. The lower cover 2 and the upper cover 1 are welded around to form a boss cavity 5 and a rib-shaped cavity 6 , and the boss cavity 5 communicates with the rib-shaped cavity 6 . The degassing and liquid injection holes 11 communicate with the rib-shaped cavity 6 . The rib-shaped cavity 6 is squeezed and sealed in the pressure bonding area 7 , and the pressure bonding area 7 is located between the degassing and liquid injection hole 11 and the boss cavity 5 . Before the rib-shaped cavity 6 of the pressure bonding area 7 is squeezed and sealed, the boss cavity 5 communicates with the atmosphere through the rib-shaped cavity 6 . After the pressure bonding area 7 is squeezed and sealed, the boss cavity 5 is sealed.

The capillary structure 3 is attached to the lower surface of the upper cover plate 1 and the upper surface of the lower cover plate 2 . The independent capillary support structure 4 is arranged in the boss cavity 5 and is connected with the capillary structure 3 . A phase change medium (not shown in the figure) exists in the boss cavity 5 .

Compared with the traditional temperature equalizing plate, the high material utilization temperature equalizing plate does not need a degassing and liquid injection pipe, but consists of a convex rib-shaped cavity 6 and a degassing liquid injection hole 11 to form a complete degassing liquid injection structure. There is no need for high-frequency sealing and welding or dispensing of the root of the exhaust pipe, and no cutting is required, which improves the utilization rate of materials, simplifies the operation process, and reduces the processing cost.

As shown in FIG. 1 , the pressure bonding area 7 is located between the degassing and liquid injection hole 11 and the boss cavity 5 . Preferably, the pressure bonding area 7 is located at the rear end of the convex rib cavity 6 close to the boss cavity 5 . In order to reduce the portion of the rib-shaped cavity 6 that communicates with the boss cavity 5 , the phase change medium flowing into the rib-shaped cavity 6 is reduced.

In terms of size, the cross-sectional width of the rib-shaped cavity 6 may be 1 mm to 3 mm, and the height of the rib-shaped cavity 6 may be 0.2 mm to 1.2 mm. Correspondingly, the diameter of the degassing and liquid injection holes 11 is 1 mm˜3 mm. The diameter of the degassing and liquid injection holes 11 is not easy to be larger than the cross-sectional width of the rib-shaped cavity 6 , and the projection of the degassing and liquid injection holes 11 should completely fall within the rib-shaped cavity 6 .

In terms of materials, this vapor chamber is suitable for more metal materials than traditional vapor chambers, such as copper, copper alloy, aluminum alloy, magnesium alloy, iron, stainless steel, titanium, titanium alloy, and composite metal materials with metal coating.

In the embodiments shown in FIGS. 1 to 3 , the degassing and liquid injection holes 11 and the rib-shaped cavity 6 are arranged at the corners of the high material utilization temperature uniformity plate, so the boss cavity 5 has a certain amount at the corners. Adduction. In the second embodiment, as shown in FIGS. 4 to 6 , the degassing and liquid injection holes 11 and the rib-shaped cavity 6 are arranged on the side of the high material utilization temperature uniform plate, and the boss cavity 5 is correspondingly located on this side. There is a retraction structure on the side to allow enough space for the rib-shaped cavity 6 to flow out.

Preferably, a positioning hole 8 is also opened on the upper cover 1 and the lower cover 2 to facilitate the positioning of the degassing and liquid injection equipment. After the upper cover 1 and the lower cover 2 are combined, the positioning hole 8 forms a through hole, and the positioning hole 8 are located on both sides of the degassing and liquid injection holes 11.

Based on the above-mentioned vapor chamber structure, an embodiment of the present application also provides a method for processing a vapor chamber, comprising the following steps:

Sintering the upper cover plate and the upper capillary structure into an assembly;

Sintering the lower cover, the lower capillary structure and the independent capillary support structure into an assembly;

Combining the upper cover plate and the lower cover plate by brazing, diffusion welding, resistance welding, laser welding, etc. to form a boss cavity and a convex rib cavity;

Use degassing and liquid injection equipment to pump the boss cavity into negative pressure from the degassing and liquid injection hole, and the negative pressure value is ≤1pa;

The phase change medium in the degassing and liquid injection equipment is sucked into the chamber of the uniform temperature plate by the negative pressure of the cavity, and the injection amount is controlled by the flow meter;

Press and seal the pressure bonding area of the rib cavity.

Among them, when extruding and sealing the pressure bonding area of the convex rib cavity, it should be ensured that the pressure bonding area is squeezed and deformed to 90% to 95% of the total thickness of the upper cover plate and the lower cover plate, so as to achieve better air tightness sex. If necessary, after pressing and sealing the pressure bonding area of the convex rib cavity, secondary sealing can also be performed by pressure resistance welding, ultrasonic welding or laser welding.

In a possible embodiment, before the degassing and liquid injection equipment is used to pump the boss cavity to a negative pressure, the upper cover plate can also be matched with the degassing and liquid injection equipment through the positioning holes on the upper cover plate.

Different from the existing method for manufacturing the temperature equalizing plate, the method uses the only degassing and liquid injection port, first degassing and then injecting liquid, and there is no bubble-like waste gas hidden in the capillary structure due to surface tension. The effect of primary degassing at normal temperature is better, and there is basically no need for secondary heating and degassing. The uniform temperature performance is guaranteed and the operation process is greatly simplified, reducing the equipment cost.

To sum up, the high material utilization rate temperature chamber provided by the embodiment of the present application is because the channel used by the lower cover for degassing and discharging and liquid injection is an inner rib-shaped cavity. Within the maximum size of length and width. There is no additional waste during sheet metal processing, and the cost of raw materials is maximized when the vapor chamber is mainly made of copper and aluminum. The degassing and liquid injection holes and the cavity with internal convex ribs form a complete degassing structure, which does not require the degassing pipe of the traditional vaporizing plate degassing structure, and thus does not require high-frequency sealing welding or dispensing at the root of the exhaust pipe, which greatly simplifies the raw materials. , operating procedures and equipment costs. After the new degassing and liquid injection structure is processed, it is squeezed and sealed in the pressure bonding area. If necessary, the secondary sealing is carried out by one of pressure resistance welding, ultrasonic welding and laser welding to ensure air tightness. The integrity of the vapor chamber is preserved, no cutting is required, and the structure is complete and beautiful.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

The previous description of the present disclosure is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The above descriptions are only preferred examples of this application, and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection of this application. within the range.

Claims (10)

1. A high material utilization temperature-uniforming plate is characterized by comprising:

the upper cover plate is provided with a degassing and liquid injecting hole;

the lower cover plate and the upper cover plate are welded to form a boss cavity and a convex rib type cavity, the boss cavity is communicated with the convex rib type cavity, the degassing and liquid injection hole is communicated with the convex rib type cavity, the convex rib type cavity is extruded and sealed in a pressure combination area, and the pressure combination area is positioned between the degassing and liquid injection hole and the boss cavity;

the capillary structure is attached to the lower surface of the upper cover plate and the upper surface of the lower cover plate;

the independent capillary support structure is arranged in the boss cavity and is connected with the capillary structure; and

phase change medium existing in the boss cavity.

2. The high material utilization temperature equalization plate of claim 1, wherein: the pressure combination area is located at the position, close to the boss cavity, of the tail end of the rib type cavity.

3. The high material utilization temperature equalization plate of claim 1, wherein: the width of the section of the convex rib type cavity is 1 mm-3 mm, and the height of the convex rib type cavity is 0.2 mm-1.2 mm.

4. The high material utilization temperature equalization plate of claim 3, wherein: the aperture of the degassing and injecting hole is 1 mm-3 mm.

5. The material utilization rate vapor chamber of claim 1, wherein: the degassing liquid injection hole and the convex rib cavity body are arranged at the corner or the side of the uniform temperature plate with high material utilization rate.

6. The high material utilization temperature equalization plate of claim 1, wherein: the upper cover plate and the lower cover plate are also provided with positioning holes, and the positioning holes are formed in two sides of the convex rib cavity body.

7. The method for processing the uniform temperature plate is characterized by comprising the following steps of:

sintering the upper cover plate and the upper capillary structure into an assembly;

sintering the lower cover plate, the lower capillary structure and the independent capillary support structure into an assembly;

combining the upper cover plate and the lower cover plate to form a boss cavity and a convex rib cavity;

pumping the boss cavity into negative pressure from the degassing injection hole by using degassing injection equipment, wherein the negative pressure value is less than or equal to 1 pa;

absorbing the phase change medium in the degassing and liquid injection equipment into the cavity of the temperature-uniforming plate by utilizing the negative pressure of the cavity, and controlling the injection amount through a flowmeter;

and extruding and sealing the pressure combination area of the convex rib cavity.

8. The material utilization temperature-uniforming plate of claim 7, wherein: when the pressure combination area of the convex rib cavity is extruded and sealed, the pressure combination area is extruded and deformed to 90% -95% of the total thickness of the upper cover plate and the lower cover plate.

9. The material utilization rate vapor chamber of claim 7, further comprising, after extrusion sealing the pressure bonding area of the rib cavity: and carrying out secondary sealing by pressure resistance welding, ultrasonic welding or laser welding.

10. The temperature equalization plate with high material utilization rate as claimed in claim 7, wherein before the boss cavity is pumped to negative pressure by the degassing and liquid injection device, the upper cover plate is matched with the degassing and liquid injection device through a positioning hole in the upper cover plate.

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