Upper cover plate and vapor chamber

Abstract

The upper cover plate comprises an upper cover plate body, a first groove is formed in one side face of the upper cover plate body, a heating area is arranged on the other side face of the upper cover plate body, and a plurality of strip-shaped flow guide columns are arranged in the range, directly facing the heating area, in the first groove. The upper cover plate has the advantages that the compressive strength of the upper cover plate in a heating area is improved, the upper cover plate is not prone to sinking, and meanwhile the flow guide effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat dissipation devices, in particular to an upper cover plate and a heat spreading plate. BACKGROUND

[0002] In recent years, the miniaturization and lightweight of electronic devices have gradually developed in the field of electronic equipment, and as the size and thickness of electronic devices continue to decrease and the working frequency of chips continues to increase, the heat flux of electronic devices gradually increases. At present, a large number of electronic devices fail due to high temperature, and therefore the heat dissipation of electronic devices has become a key problem. At present, the integration and thinness of electronic devices such as mobile phones, smart watches and tablets have become mainstream, and higher performance and faster speed are required to meet the needs of portability and high speed. However, with the continuous development of electronic devices towards high speed, high frequency and miniaturization, the energy consumption and power consumption of electronic devices continue to increase, resulting in an increase in heat generation, and therefore improving the performance of the heat sink has become a top priority.

[0003] The heat spreading plate is a phase change heat transfer element that relies on the phase change cycle of working medium vaporization and condensation in an internal vacuum state to transfer heat, quickly transfer the heat flow accumulated on the heat source surface, and diffuse the heat flow to a larger condensation surface to dissipate heat, thereby reducing the heat flux density on the surface of the electronic device and increasing the reliability of the electronic device. The heat spreading plate is widely used in the heat dissipation of high-power components (CPU, GPU and high-speed hard disk, etc.) due to its excellent temperature uniformity, low thermal resistance and high critical heat flux.

[0004] In the production and testing process of the ultra-thin heat spreading plate, a certain pressure needs to be applied to the heat spreading plate. Due to the development trend of ultra-thin, the thickness of the upper and lower cover plates of the existing heat spreading plate is relatively thin, and therefore the pressure resistance of the heating position of the upper cover plate is low during the testing process, which is prone to pressure injury and causes problems such as indentation, resulting in a high scrap rate after product testing. CONTENT OF THE INVENTION

[0005] The main purpose of the present application is to provide an upper cover plate and a heat spreading plate, which aims to solve the technical problem of low pressure resistance of the heating position of the upper cover plate in the existing heat spreading plate, which is prone to cause indentation.

[0006] To achieve the above-mentioned purpose, the present application provides an upper cover plate, which comprises an upper cover plate body, a first groove is arranged on one side of the upper cover plate body, a heating area is arranged on the other side of the upper cover plate body, and a plurality of strip-shaped flow guide columns are arranged in the range of the first groove opposite to the heating area.

[0007] Optionally, a plurality of convex columns are further arranged in the first groove, and the convex columns are arranged throughout the first groove.

[0008] Optionally, the plurality of strip-shaped flow guide columns are arranged in at least two rows, and at least one row of convex columns is arranged between the two adjacent rows of strip-shaped flow guide columns.

[0009] Optionally, every three adjacent convex columns are arranged in an equilateral triangle.

[0010] Optionally, the strip-shaped flow guide column is in a straight line type, a curve type or a polyline type.

[0011] Optionally, the upper cover plate body is connected with a first press-fit plate, the first press-fit plate is provided with a first injection channel, and the first injection channel is not communicated with the first groove.

[0012] To achieve the above-mentioned purposes, the application further provides a vapor chamber, which comprises a lower cover plate, one side surface of the lower cover plate is press-fitted with the upper cover plate, a second groove is formed in the side surface of the lower cover plate close to the upper cover plate body, and the second groove and the first groove enclose an enclosed cavity.

[0013] Optionally, the lower cover plate is connected with a second press-fit plate, the second press-fit plate is used to be press-fitted into one body with the first press-fit plate, a second injection channel is formed in the second press-fit plate, the second injection channel and the first injection channel enclose an injection port, and the second injection channel is communicated with the second groove.

[0014] Optionally, the connection position of the first press-fit plate and the upper cover plate body and the connection position of the second press-fit plate and the lower cover plate are both provided with a shear cut.

[0015] Optionally, the second injection channel comprises a first straight channel, a variable-diameter channel and a second straight channel connected in sequence, the second straight channel is communicated with the second groove, the inner diameter of the second straight channel is smaller than that of the first straight channel, and the inner diameter of the variable-diameter channel gradually decreases from the first straight channel to the second straight channel.

[0016] The application can achieve the following beneficial effects:

[0017] The application comprises an upper cover plate body, one side surface of the upper cover plate body is provided with a first groove, the other side surface of the upper cover plate body has a heating area, and a plurality of strip-shaped flow guide columns are arranged in the range of the first groove opposite to the heating area. Based on the structure of the application, a plurality of strip-shaped flow guide columns are arranged in the first groove of the upper cover plate body corresponding to the position of the heating area, the strip-shaped flow guide column plays a role of a reinforcing rib, improves the compression structural strength of the heating area position, is not prone to depression, on the other hand, the strip-shaped flow guide column reduces the heat diffusion of the heating area position, is more conducive to the propagation of heat, plays a role of improving performance, and can also ensure the guiding effect of the fluid, which is a hit many birds with one stone, thereby improving the product yield and performance at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. In all the drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, the elements or parts are not necessarily drawn according to the actual proportions.

[0019] Figure 1 A perspective structural schematic view of an upper cover plate in an embodiment of the present application;

[0020] Figure 2 A planar structural schematic view of an upper cover plate in an embodiment of the present application;

[0021] Figure 3 An exploded structural schematic view of a heat plate in an embodiment of the present application;

[0022] Figure 4 An exploded structural schematic view of another view of the heat plate in the Figure 3

[0023] Figure 5 A planar structural schematic view of a lower cover plate in an embodiment of the present application.

[0024] Reference signs:

[0025] 110-upper cover plate body, 111-first groove, 120-strip-shaped flow guide column, 130-convex column, 140-first pressing plate, 150-first injection channel, 160-lower cover plate, 161-second groove, 170-second pressing plate, 180-second injection channel, 181-first straight flow channel, 182-diameter-changing flow channel, 183-second straight flow channel, 190-cutting opening.

[0026] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly. ​

[0029] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixing", and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium; can be internal connection of two elements, or interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0030] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0031] Embodiment 1

[0032] Reference Figures 1-2 The present embodiment provides an upper cover plate, which comprises an upper cover plate body 110, a first groove 111 is arranged on one side of the upper cover plate body 110, and a heating area is arranged on the other side (i.e. the back) of the upper cover plate body 110. A plurality of strip-shaped flow guide columns 120 are arranged in the first groove 111 and opposite the range of the heating area.

[0033] Since the heating area is heated by the heating copper block on the back of the upper cover plate, the heating copper block is easy to generate a large pressure on the heating position. Since the thickness of the corresponding inner cavity part of the vapor chamber is thin, the thickness of the upper cover plate is also thin. During the manufacturing process, the test station will cause the traditional upper cover plate to have a pressure mark due to the pressure factor, which will cause damage to the appearance of the product, resulting in low yield of finished products, thereby increasing unnecessary costs and other problems.

[0034] Therefore, in the embodiment, the plurality of strip-shaped flow guide columns 120 are arranged in the first groove 111 of the upper cover plate body 110 at positions corresponding to the heating areas, the strip-shaped flow guide columns 120 serve as reinforcing ribs, the compression structural strength of the heating area positions is improved, and the strip-shaped flow guide columns 120 reduce heat diffusion of the heating area positions, which is beneficial to heat propagation and improves performance, and the strip-shaped flow guide columns 120 can also guide fluid, which is a win-win result, thereby improving product yield and performance.

[0035] In summary, after the strip-shaped flow guide columns 120 are added, the working medium and the gas are limited, the gas and the liquid are more concentrated to diffuse to the condensation section, heat loss is reduced, the gas path is reduced, and the overall performance is improved, that is, the test power is improved, the test result is optimized, and the heat dissipation efficiency is faster than that of the ordinary vapor chamber.

[0036] It should be noted that the manufacturing method of the upper cover plate includes the following steps:

[0037] Step S1: uniformly applying photosensitive oil to the surface of the blank material;

[0038] Step S2: exposing the blank material to light on an exposure machine using a film, and developing the exposed blank material with alkali, so that the etching is exposed and the etching is blocked;

[0039] Step S3: etching the blank material according to the process by using an etching machine to obtain the upper cover plate;

[0040] Step S4: cleaning the upper cover plate, removing ink on the ink removal line, and polishing / passivating.

[0041] As an optional embodiment, a plurality of convex columns 130 are arranged in the first groove 111, and the convex columns 130 are arranged in the entire first groove 111.

[0042] In the embodiment, the convex columns 130 are generally circular columns, and the plurality of convex columns 130 are uniformly arranged to enhance the support strength and avoid appearance problems. It should be noted that the diameter of the convex column 130 can be 0.5 mm, and the distance between two circular columns can be 1 mm, so that the upper cover plate with a thickness of 0.3 mm or less can be adapted.

[0043] As an optional embodiment, the plurality of strip-shaped flow guide columns 120 are arranged in at least two rows, and at least one row of convex columns 130 is arranged between the adjacent two rows of strip-shaped flow guide columns 120.

[0044] In the embodiment, the row of convex columns 130 between the two rows of strip-shaped flow guide columns 120 can avoid the product from being concave due to the large spacing between the two rows of strip-shaped flow guide columns 120 in the forming process, and improve the product quality. It should be noted that the position of the strip-shaped flow guide column 120 is the heating area position, and the size of the copper block heated by the vapor chamber is usually 10mm*10mm, so the length of the strip-shaped flow guide column 120 can be 4mm, the width of the strip-shaped flow guide column 120 is the same as the diameter of the convex column 130, which is 0.5mm, and the transverse distance between the strip-shaped flow guide columns 120 is 1mm and the longitudinal distance is 1.5mm, which can completely protect and support the appearance of the product.

[0045] As an optional embodiment, each adjacent three convex columns 130 are arranged in an equilateral triangle, thereby forming a triangular stable structure to further improve the support strength.

[0046] As an optional embodiment, the strip-shaped flow guide column 120 is in a straight line type or a curved line type or a broken line type, and is preferably in a straight line type.

[0047] As an optional embodiment, the top of the upper cover plate body 110 is connected with a first pressing plate 140, the first pressing plate 140 is provided with a first injection channel 150, and the first injection channel 150 is not communicated with the first groove 111.

[0048] In the embodiment, the upper cover plate body 110 needs to be pressed with the lower cover plate to form a vapor chamber, and after pressing, the first pressing plate 140 needs to be cut off at the connection position of the first pressing plate 140 and the upper cover plate body 110, and then sealed. Here, the first injection channel 150 does not contact the first groove 111, so that the entire first injection channel 150 can be cut off, and only the corresponding injection channel on the lower cover plate is reserved. At this time, the opening of the injection channel is small, so that the problem of not being clamped tightly at the secondary clamping position can be avoided, the overall test yield can be effectively improved, and the appearance problem caused by the large sealing at the secondary clamping can be avoided.

[0049] It should be noted that the length direction of the strip-shaped flow guide column 120 should be parallel to the fluid injection direction corresponding to the first injection channel 150, so as to ensure the flow guide effect.

[0050] Embodiment 2

[0051] Reference Figures 1-5 The embodiment also provides a vapor chamber, which comprises a lower cover plate 160, one side surface of the lower cover plate 160 is provided with an upper cover plate in the above-mentioned embodiment, a second groove 161 is formed on the side surface of the lower cover plate 160 close to the upper cover plate body 110, and the second groove 161 and the first groove 111 form a closed cavity.

[0052] In the embodiment, after the upper cover plate and the lower cover plate 160 in the embodiment 1 are pressed to form a complete heat plate, the second groove 161 and the first groove 111 can surround an enclosed cavity in which fluid flows easily. At this time, the strip-shaped flow guide column 120 and the convex column 130 can abut against the inner wall of the second groove 161, so that the entire heat plate has high structural strength and high heat dissipation efficiency.

[0053] It should be noted that the material of the upper cover plate body 110 and the lower cover plate 160 can be copper, aluminum, stainless steel or other metal materials, and generally copper material is used.

[0054] As an optional embodiment, the second pressing plate 170 is connected to the top of the lower cover plate 160, the second pressing plate 170 is used to be pressed into one body with the first pressing plate 140, the second injection channel 180 is formed on the second pressing plate 170, the second injection channel 180 surrounds the injection port with the first injection channel 150, and the second injection channel 180 is in communication with the second groove 161.

[0055] In the embodiment, after the fluid enters the enclosed cavity through the injection port, the second pressing plate 170 and the first pressing plate 140 that are pressed into one body are cut as a whole (laser cutting or manual cutting can be used), at this time, only the opening of the second injection channel 180 is left, and then the opening is sealed, so that the sealing performance is good and the appearance quality of the sealing is high.

[0056] As an optional embodiment, the connection position of the first pressing plate 140 and the upper cover plate body 110 and the connection position of the second pressing plate 170 and the lower cover plate 160 are provided with a cutting opening 190, both sides have the cutting opening 190, and the cutting line of the two cutting openings 190 is the cutting line, so that space is reserved for subsequent laser cutting and tool cutting, the cutting damage to the product is reduced, and the cutting quality is improved.

[0057] As an optional embodiment, the second injection channel 180 includes a first straight channel 181, a variable-diameter channel 182 and a second straight channel 183 connected in sequence, the second straight channel 183 is in communication with the second groove 161, the inner diameter of the second straight channel 183 is smaller than the inner diameter of the first straight channel 181, and the inner diameter of the variable-diameter channel 182 gradually decreases from the first straight channel 181 to the second straight channel 183.

[0058] In the embodiment, when the fluid is injected, it can enter the internal cavity through the first straight channel 181, the variable-diameter channel 182 and the second straight channel 183 in sequence. Through the multi-section variable-diameter design, the fluid injection stability can be improved. After the second pressing plate 170 and the first pressing plate 140 are cut as a whole, only the opening of the second straight channel 183 with a small diameter is exposed, so that the sealing and cutting head can be easily sealed, and the sealing and cutting head yield of the product is improved.

[0059] The above merely preferred embodiments of the present application and are not intended to limit the patent scope of the present application, any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An upper cover plate characterized by, The upper cover plate body is provided with a first groove on one side, and a heating area on the other side, and a plurality of strip-shaped flow guide columns are arranged in the first groove opposite to the heating area.

2. An upper cover plate as claimed in claim 1, characterized in that A plurality of convex columns are arranged in the first groove.

3. An upper cover plate as claimed in claim 2, characterized in that The strip-shaped flow guide columns are arranged in at least two rows, and at least one row of convex columns is arranged between the two adjacent rows of strip-shaped flow guide columns.

4. An upper cover plate as claimed in claim 2, characterized in that Every three adjacent convex columns are arranged in an equilateral triangle.

5. An upper cover plate as claimed in claim 1, characterized in that The strip-shaped flow guide columns are in a straight line, a curve or a broken line.

6. An upper cover plate as claimed in any one of claims 1-5, characterized in that A first pressing plate is connected to the top of the upper cover plate body, and a first injection channel is arranged on the first pressing plate.

7. A vapor chamber, characterized by, The lower cover plate is provided with an upper cover plate as claimed in any one of claims 1-6 on one side by pressing, and a second groove is arranged on the side of the lower cover plate close to the upper cover plate body, so as to form a closed cavity together with the first groove.

8. The vapor chamber of claim 7, wherein, A second pressing plate is connected to the top of the lower cover plate, and is used to be pressed into one body with the first pressing plate.

9. The vapor chamber of claim 8, wherein, The connection positions of the first pressing plate and the upper cover plate body, and the connection positions of the second pressing plate and the lower cover plate are all provided with shearing grooves.

10. The vapor chamber of claim 8, wherein, The second injection channel comprises a first straight channel, a variable-diameter channel and a second straight channel connected in sequence. The inner diameter of the second straight channel is smaller than that of the first straight channel, and the inner diameter of the variable-diameter channel gradually decreases from the first straight channel to the second straight channel.

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