CN209829448U

CN209829448U - Coating device

Info

Publication number: CN209829448U
Application number: CN201920005620.2U
Authority: CN
Inventors: 余波波
Original assignee: Johnson Automatic Air Conditioning Refrigeration Equipment Wuxi Co Ltd; Johnson Controls Technology Co
Current assignee: Johnson Automatic Air Conditioning Refrigeration Equipment Wuxi Co Ltd; Johnson Controls Air Conditioning and Refrigeration Wuxi Co Ltd; Johnson Controls Technology Co
Priority date: 2019-01-02
Filing date: 2019-01-02
Publication date: 2019-12-24
Anticipated expiration: 2029-01-02

Abstract

The present application provides a coating apparatus, comprising: base, otter board and scraper blade. The screen plate comprises a hole part, wherein a plurality of holes are formed in the hole part, the holes allow the heat conduction materials to pass through, and the screen plate is fixed on the base and used for guiding the heat conduction materials to be coated on the surface of the bottom plate of the electronic device; the lower end of the scraper is close to the screen plate, and the scraper can be driven to reciprocate relative to the base, so that the heat conduction material is coated on the surface of the bottom plate of the electronic device through the hole parts on the screen plate. The coating device in the application can make the thickness of the heat conducting material layer on the bottom plate of the electronic device thinner and uniform.

Description

Coating device

Technical Field

The present application relates to a coating apparatus, and more particularly, to an apparatus for coating a thermally conductive material.

Background

Electronic devices that easily generate heat, such as IGBTs (insulated gate bipolar transistors), are provided in some electrical components. Electronic devices that are prone to heat generation contain a base plate that can be used to conduct heat from the electronic device to a heat sink, such as a heat sink, that conducts the heat away to the external environment. In order to enhance the heat conduction effect of the electronic device installed in the electrical component, a heat conductive silicone grease is generally applied on the bottom plate of the electronic device to facilitate the heat transfer to the heat dissipation portion of the electrical component. The existing heat-conducting silicone grease is coated on the surface of a metal sheet in a back-and-forth rolling manner by an operator holding a roller, and the coating time is long and the coating is not easy to be uniform.

SUMMERY OF THE UTILITY MODEL

To solve the above problems, the present application provides a coating apparatus for coating a heat conductive material to a surface of an electronic device substrate, the coating apparatus comprising:

a base;

a screen plate including a hole part provided with a plurality of holes allowing a heat conductive material to pass therethrough, the screen plate being fixed on the base for guiding a coating of the heat conductive material on a surface of a bottom plate of an electronic device disposed below the screen plate; and

a scraper having a lower end close to the screen plate, the scraper being capable of being driven so as to be capable of reciprocating relative to the base, thereby coating a heat conductive material on a surface of a bottom plate of an electronic device through holes on the screen plate.

Further, the heat conduction material is heat conduction silicone grease.

Further, the coating apparatus further includes:

the pair of guide rails are respectively arranged on two sides of the base; and

and a moving mechanism on which the squeegee is mounted, the moving mechanism being capable of reciprocating along the pair of guide rails.

Further, the aperture and distribution arrangement of the holes are set according to the heat dissipation distribution of the bottom plate of the electronic device.

Further, the base comprises a screen plate installation cavity penetrating through the base, and the screen plate is installed in the screen plate installation cavity.

Further, the mesh plate comprises an extension part formed by extending outwards from the hole part, and the extension part is used for storing the heat conduction material.

Further, the screen plate comprises a mounting edge formed by bending the side edge of the screen plate upwards, and the mounting edge is used for mounting the screen plate on the base.

Further, the coating apparatus further includes:

the coating machine comprises a workbench, wherein a limiting part is arranged on the workbench, and a coated electronic device can be placed on the workbench and limited by the limiting part, so that the coated electronic device can be aligned with the hole part of the screen plate.

Further, the table includes a support column on which one end of the base is mounted, the base being rotatable relative to the support column and movable relative to the support column.

Furthermore, the scraper plate is provided with a working end, the working end is positioned at the lower part of the scraper plate, the working end becomes thinner gradually from top to bottom, the working end comprises an edge part, the edge part can be in contact with the screen plate, and the edge part is parallel to the upper surface of the screen plate; and is

The pair of guide rails is parallel to the upper surface of the screen plate, so that the moving plane of the blade part is parallel to the upper surface of the screen plate.

The coating device in the application can make the thickness of the heat conducting material layer on the bottom plate of the electronic device thinner and uniform. The coating operation can be completed in one time, and the operation time is saved. And the coating device enables the distribution of the heat conduction material coated on the bottom plate of the electronic device to be consistent with the heat distribution of the electronic device.

Drawings

FIG. 1A is a perspective view of a coating apparatus of the present application;

FIG. 1B is an exploded view of the coating apparatus of FIG. 1A;

fig. 2 is a perspective view of a moving mechanism of the coating apparatus in the present application;

FIG. 3 is a perspective view of a web of a coating apparatus of the present application;

FIG. 4 is a perspective view of the base of the coating apparatus of the present application;

FIG. 5 is a perspective view of a table of a coating apparatus of the present application;

FIG. 6A is a side view of a coating apparatus of the present application;

FIG. 6B is a side view of the coating apparatus of the present application with the base rotated upward;

FIG. 6C is a side view of the coating apparatus of the present application, ready for coating;

FIG. 6D is a side view of the coating apparatus of the present application shown after coating has been completed;

FIG. 7 is a thermal profile of an electronic device backplane for one embodiment;

FIG. 8 is a distribution diagram of the pores of a mesh plate of an embodiment.

Detailed Description

Various embodiments of the present invention will now be described with reference to the accompanying drawings, which form a part hereof. It should be understood that although directional terms such as "front," "rear," "upper," "lower," "left," "right," and the like may be used herein to describe various example structural portions and elements of the application, these terms are used herein for convenience of description only and are to be determined based on the example orientations shown in the drawings. Because the embodiments disclosed herein can be arranged in a variety of orientations, these directional terms are used for purposes of illustration only and are not to be construed as limiting.

Fig. 1A is a perspective view of a coating apparatus 100 in the present application, and fig. 1B is an exploded view of the coating apparatus 100 in fig. 1A, showing the structure of the coating apparatus 100. As shown in fig. 1A and 1B, the coating apparatus 100 includes a moving mechanism 104, a screen 105, a base 107, and a table 109. The platen 109 is used to place the coated electronic device 140. The screen 105 is mounted on a base 107 and the base 107 is mounted on a table 109 so that the screen 105 can be aligned with the coated electronic device 140. The moving mechanism 104 is provided with a scraper 102, and the moving mechanism 104 can move back and forth relative to the base 107, so that the scraper 102 is driven to move back and forth relative to the upper surface of the screen plate 105, and the heat conduction material is distributed on the coated electronic device 140. The heat conducting material is heat conducting silicone grease. The thermally conductive material is paste-like when applied. The following will be described in detail with reference to the specific structure of the coating apparatus 100.

Fig. 2 is a perspective view of the moving mechanism 104 of the coating apparatus 100 according to the present application, showing the structure of the moving mechanism 104, and as shown in fig. 2, the moving mechanism 104 includes a support portion 205, a handle portion 230, sliders 221 and 222, a blade fixing member, and a blade 102. The support portion 205 has a substantially flat plate shape, and the support portion 205 includes an upper flange 251 and a lower flange 252. The handle portion 230 is mounted on the upper flange 251 for easy grasping by an operator. The sliders 221 and 222 are respectively provided at both ends of the lower flange 252 in the longitudinal direction, and the sliders 221 and 222 respectively have grooves 225 and 226, and the grooves 225 and 226 are adapted to be engaged with guide rails on the base 107, thereby enabling the moving mechanism 104 to reciprocate relative to the base 107. The blade securing assembly includes a blade mounting block 234, limiting portions 241, 242, and a locking device 250. The blade 102 is fixedly attached to the blade mounting block 234, and the blade mounting block 234 is attached to the support 205 via the locking device 250 such that the blade 102 is attached to the support 205. The squeegee 102 has a ready position and a working position, and when the squeegee 102 is in the working position, the squeegee 102 is in a lower position with respect to the support portion 205 so as to be able to approach the screen 105; when the blade 102 is in the ready position, the blade 102 is in a higher position relative to the support 205, thereby facilitating operator replacement of the blade 102. The locking devices 250 are connected to the squeegee mounting block 234 and the support portion 205, respectively. The locking device 250 is capable of moving the squeegee mounting block 234 up and down relative to the support portion 205 so that the squeegee 102 can be moved back and forth between the ready position and the working position. The locking device 250 has a locking mechanism that enables the blade 102 to be locked in the ready position or the working position. The squeegee mounting block 234 also includes guide bars 248, 249, the guide bars 248, 249 extending upwardly from both sides of the top surface of the squeegee mounting block 234. The guide bars 248, 249 can pass through the stopper portions 241, 242 and cooperate with the stopper portions 241, 242, so that the squeegee mounting block 234 can move up and down relative to the support portion 205 along the extending direction of the guide bars 248, 249, but cannot rotate or rock in other directions relative to the support portion 205.

As also shown in fig. 2, the flight 102 includes a working end 210, the working end 210 is located at a lower portion of the flight 102, and the working end 210 is tapered from top to bottom such that the lower portion of the working end 210 forms an edge 211, the thinner edge 211 facilitating a reduction in resistance to movement of the flight 102. The blade 211 is capable of contacting the screen plate 105, pushing and scraping the thermally conductive material deposited on the screen plate 105 during movement of the scraper 102 relative to the screen plate 105, such that the thermally conductive material is dispensed through the screen plate 105 onto the electronic device 140 to be coated. The lower ends of the blades 211 are uniform in height so that the blades 211 can be parallel to the upper surface of the mesh plate 105. That is, when the scraper 102 is in the working position, the blade 211 is close to or in contact with the upper surface of the mesh plate 105, and the distance between the mesh plates 105 at each position of the blade 211 is as uniform as possible, so that the surface of the heat conductive material coated on the electronic device 140 after the blade 211 scrapes the surface of the mesh plate 105 is flat.

Fig. 3 is a perspective view of the screen 105 of the coating apparatus 100 of the present application, and as shown in fig. 3, the screen 105 has a substantially square flat plate shape and has four side edges 311, 312, 313, 314. The four side edges 311, 312, 313, 314 are respectively bent upwards to form a mounting edge 309, and a mounting hole is formed on the mounting edge 309 for fixedly connecting with the base 107. The mounting edge 309 includes a flange 329 that is bent outwardly, and the flange 329 is provided with a mounting hole for further attachment to the base 107. The flap 329 may also prevent the mesh panel 105 from falling relative to the base 107 during installation of the mesh panel 105 on the base 107. The mesh plate 105 includes a hole portion 305, and the hole portion 305 is provided with a plurality of holes 301, and the plurality of holes 301 allow the thermal conductive material to pass therethrough, thereby guiding the coating of the thermal conductive material on the surface of the base plate of the electronic device 140. The aperture portion 305 is provided to match the heat dissipation requirements of the chassis of the electronic device 140, as will be described in detail below. The mesh plate 105 includes an extension portion 307 formed to extend outward from the periphery of the hole portion 305, and the extension portion 307 is not provided with a hole for stacking a heat conductive material.

Fig. 4 is a perspective view of the base 107 of the coating apparatus 100 of the present application. As shown in fig. 4, the base 107 includes a screen mounting pocket 425 extending through the base 107 for mounting the screen 105. The shape and area of screen mounting pocket 425 matches the shape and area of screen mounting pocket 425 so that screen 105 can be inserted into screen mounting pocket 425 from above base 107 and flap 329 of screen 105 cannot pass through screen mounting pocket 425 to rest on the upper surface of base 107. After the screen 105 is inserted into the screen mounting pocket 425, the screen 105 may be fixedly attached to the base 107 by fasteners (e.g., screws) through mounting holes in the mounting edge 309 and the flap 329. The upper surface of the base 107 is provided with guide rails 411, 412 on the left and right sides as viewed in the drawing, respectively, for engaging with the sliders 221, 222 of the moving mechanism 104, so that the moving mechanism 104 moves along the extending direction of the guide rails 411, 412. The guide rails 411, 412 extend from the front side to the rear side of the base 107, so that the moving mechanism 104 can reciprocate between the front side and the rear side of the base 107. In this embodiment the guide rails 411, 412 are able to partly enter the grooves 225, 226 of the sliders 221, 222, in other embodiments grooves may be provided on the guide rails, enabling the sliders to partly enter the grooves of the guide rails. The base 107 is provided at its end on the rear side with a pivot 430, and the pivot 430 is mounted on the table 109 so that the base 107 can rotate about the axis of the pivot 430.

Fig. 5 is a perspective view of the table 109 of the coating apparatus 100 according to the present application. As shown in FIG. 5, the platen 109 includes a support table 510 and support columns 591, 592. Support posts 591, 592 extend upward from opposite ends of the rear side of support table 510. The supporting columns 591 and 592 are respectively provided with movable blocks 581 and 582 and locking devices 583 and 584. The pivot 430 of the base 107 is attached to the movable blocks 581 and 582, and the movable blocks 581 and 582 are movable up and down with respect to the support base 510, so that the height of the base 107 can be adjusted by adjusting the heights of the movable blocks 581 and 582. The locking devices 583, 584 can lock the movable blocks 581, 582 to be fixed at a desired position, so that the height of the base 107 is fixed. The support table 510 is provided with a position limiting portion 480 for placing and limiting the coated electronic device. The limiting portion 480 is a groove recessed inward from the top surface of the stage 109 for placing the coated electronic device 140. The stopper 480 is provided to align a portion to be coated of the electronic device 140 (e.g., a base plate) with the hole portion 305 of the screen 105 and to enable the portion to be coated of the electronic device 140 to contact the hole portion 305 of the screen 105. In other embodiments, the position limiting portion 480 may be in other forms, such as a clip protruding from the upper surface of the support base 510, as long as it can limit the electronic device 140 so that the portion to be coated can contact and align with the hole 305 of the screen 105.

Fig. 6A-6D illustrate the operation of the coating apparatus 100 of the present application. FIG. 6A is a side view of the coating apparatus 100 of the present application with the squeegee 102 in the operating position and the squeegee 102 in contact with the upper surface of the screen 105. Fig. 6B is a side view of the application apparatus 100 with the base rotated upward, and when application is desired, the operator opens the base 107 so that the base 107 rotates about the axis of the pivot 430 and is thus away from the support table 510. At this time, the operator places the electronic device 140 to be coated in the stopper 480. Fig. 6C is a side view of the coating apparatus of the present application ready for coating, with the operator repositioning the base 107 so that the aperture 305 of the screen 105 is aligned with the floor of the electronic device 140 to be coated. The squeegee 102 is positioned on the rear side (i.e., left side in the figure) of the support table 510 and is aligned with the extension 307 of one end of the screen 105. A certain amount of heat conductive material in paste form is deposited on the extended portion 307 in the vicinity of the blade 102, and the heat conductive material is deposited on the extended portion 307 between the blade 102 and the hole portion 305, i.e., immediately before the movement direction of the blade 102, so that the heat conductive material can be pushed when the blade 102 moves. Fig. 6D is a side view of the coating apparatus 100 according to the present invention, in which when coating the heat conductive material, the operator pushes the moving mechanism 104 to move to the front side (i.e., the right side in the drawing) of the support base 510, and reaches the extension 307 at the other end of the screen plate 105 through the hole 305. During the movement of the squeegee 102, the squeegee 102 pushes the heat conductive material accumulated in front of the moving direction of the squeegee 102, and the heat conductive material is applied to the bottom plate of the electronic component 140 through the holes of the hole portions 305, thereby completing the application. During the coating process, the moving plane of the blade part 211 of the scraper 102 is parallel to the upper surface of the screen plate 105 and the blade part 211 is in contact with the upper surface of the screen plate 105, so that the upper surface of the coated heat conducting material is flat, i.e. the height of the upper surface of the coated heat conducting material is basically the same. After the coating is completed, the operator lifts the base 107 again to take out the coated electronic device 140 and starts to prepare for coating the next electronic device 140.

FIG. 7 is a thermal profile of a backplane of an electronic device 140 according to one embodiment, and FIG. 8 is a profile of holes of a hole section (305) of a mesh sheet (105) designed according to the thermal profile of the electronic device 140 of FIG. 7; as shown in fig. 7, the heat distribution is not uniform during the operation of the electronic device 140, and the higher portion of the curve indicates a larger amount of heat generation and the lower portion of the curve indicates a smaller amount of heat generation. The part with a large heat production needs to be better conducted away. As shown in FIG. 8, the design of the mesh plate 105 is provided with larger pore size and denser pores at the part corresponding to the large heat generation quantity; smaller pore diameters and sparser pores are provided in portions where the amount of heat generation is small. So that the backplane of the electronic device 140 can be more densely coated with the thermally conductive material in portions corresponding to larger pore sizes and denser pores. The coated electronic device 140 may be a bottom plate of an IGBT module, and after coating, the heat-conducting material is denser at a portion of the bottom plate of the IGBT module where heat is generated largely, and the area of the heat-conducting material block is larger; the heat conducting material at the part with small heat generation on the bottom plate of the IGBT module is sparse, and the area of the heat conducting material block is small so as to adapt to the heat distribution on the bottom plate of the IGBT module. After the coating is finished, the IGBT module is arranged in a corresponding device (such as a frequency converter) so that the bottom plate of the IGBT module is in contact with the heat dissipation plate of the frequency converter, and the heat conduction material can fill the gap between the bottom plate of the IGBT module and the heat dissipation plate of the frequency converter, so that the heat generated by the IGBT module is led out, and the IGBT module is prevented from being overheated. The coating apparatus 100 of the present application may also be used to coat other electronic devices, such as SCR modules.

The coating apparatus 100 of the present application can make the thickness of the heat conductive material layer on the bottom plate of the electronic device 140 thin, and be controlled within 150 μm. The coating operation can be completed in one time, and the operation time is saved. And the distribution of the heat conducting material blocks coated on the electronic device is consistent with the heat distribution, so that the heat can be effectively led out.

While only certain features of the invention have been illustrated and described herein, many modifications and changes will occur to those skilled in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.

Claims

1. A coating apparatus for applying a heat conductive material to a surface of a substrate of an electronic device (140), the coating apparatus comprising:

a base (107);

a screen plate (105), the screen plate (105) comprising a hole part (305), the hole part (305) being provided with a plurality of holes (301), the plurality of holes (301) allowing the heat conductive material to pass through, the screen plate (105) being fixed on the base (107) for guiding the coating of the heat conductive material on the surface of the bottom plate of the electronic device (140) arranged below the screen plate (105); and

a squeegee (102), a lower end of the squeegee (102) being close to the screen (105), the squeegee (102) being drivable so as to be reciprocatingly movable relative to the base (107), thereby causing the heat conductive material to be applied on the surface of the base plate of the electronic device (140) through the hole portions (305) on the screen (105).

2. A coating apparatus as in claim 1, wherein:

the heat conduction material is heat conduction silicone grease.

3. A coating apparatus as in claim 1, wherein: the coating apparatus further includes:

a pair of guide rails (411, 412), the pair of guide rails (411, 412) being respectively provided on both sides of the base (107); and

a moving mechanism (104), wherein the scraper (102) is mounted on the moving mechanism (104), and the moving mechanism (104) can reciprocate along the pair of guide rails (411, 412).

4. A coating apparatus as in claim 1, wherein:

the pore diameter and distribution arrangement of the holes (301) are set according to the heat dissipation distribution of the bottom plate of the electronic device (140).

5. A coating apparatus as in claim 1, wherein:

the base (107) includes a screen mounting cavity (425) extending through the base (107), the screen (105) being mounted in the screen mounting cavity (425).

6. A coating apparatus as in claim 1, wherein:

the mesh plate (105) comprises an extension part (307) formed by extending outwards from the hole part (305), and the extension part (307) is used for storing heat conduction materials.

7. A coating apparatus as in claim 1, wherein:

the mesh plate (105) comprises a mounting edge (309) formed by bending the side edge of the mesh plate (105) upwards, and the mounting edge (309) is used for mounting the mesh plate (105) on the base (107).

8. A coating apparatus as in claim 1, wherein: the coating apparatus further includes:

the electronic device coating machine comprises a workbench (109), wherein a limiting part (480) is arranged on the workbench (109), and a coated electronic device (140) can be placed on the workbench (109) and limited by the limiting part (480) so that the coated electronic device (140) can be aligned with the hole part (305) of the screen plate (105).

9. A coating apparatus as in claim 8, wherein:

the work table (109) comprises a support column (591, 592), one end of the base (107) being mounted on the support column (591, 592), the base (107) being rotatable relative to the support column (591, 592) and movable relative to the support column (591, 592).

10. A coating apparatus as in claim 1, wherein:

the scraper (102) is provided with a working end (210), the working end (210) is positioned at the lower part of the scraper (102), the working end (210) is gradually thinned from top to bottom, the working end (210) comprises an edge part (211), the edge part (211) can be in contact with the screen plate (105), and the edge part (211) is parallel to the upper surface of the screen plate (105); and is

The pair of guide rails (411, 412) is parallel to the upper surface of the screen plate (105) such that the moving plane of the blade (211) is parallel to the upper surface of the screen plate (105).