Heat-conducting gel defoaming device and method

Abstract

The invention provides a heat-conducting gel defoaming device and method. The device comprises a cylinder body and a piston rod, a vacuumizing opening and a discharging opening are formed in the cylinder body, the piston rod is movably arranged on the cylinder body and abuts against the inner wall of the cylinder body, the piston rod is provided with a gel feeding channel, a dispersing part is arranged at the output end of the gel feeding channel and used for dispersing gel to expose bubbles, and the vacuumizing opening is used for being connected with a vacuum device to extract the bubbles; wherein the piston rod is used for moving after air bubbles are pumped out, and gel is extruded out of the discharging opening. According to the method, the problem of bubble residue caused by relatively high gel viscosity in a traditional stirring or standing defoaming mode is avoided.

Description

Technical Field

[0001] This application relates to the field of gel production technology, specifically to a thermally conductive gel defoaming device and method. Background Technology

[0002] In high-tech fields such as optical devices, medical dressings, and electronic packaging, gel-based materials (such as silicone gels and hydrogels) are increasingly widely used. During the production or formulation of these materials, air is easily incorporated, forming numerous air bubbles. The presence of these bubbles significantly degrades the optical uniformity, mechanical properties, and interfacial bonding strength of the gel. Therefore, removing air bubbles from the gel is a critical process step to ensure the quality of the final product.

[0003] Currently, common defoaming methods in the industry mainly include settling, stirring, and centrifugation. Settling relies on bubbles rising to the liquid surface and bursting, but this method is time-consuming and often fails to completely remove bubbles from highly viscous gels. While stirring can accelerate bubble movement to some extent, the stirring process itself may introduce new bubbles, resulting in unsatisfactory defoaming effects. Centrifugation uses centrifugal force to separate bubbles, but it carries risks such as expensive equipment, limited processing capacity, and potential adverse effects on the physical structure of the gel. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this application provides a thermally conductive gel defoaming device and method.

[0005] The specific technical solution is as follows: A thermally conductive gel defoaming device includes a cylinder and a piston rod; The cylinder is provided with a vacuum port and a discharge port. The piston rod is movably mounted on the cylinder and abuts against the inner wall of the cylinder. The piston rod is provided with a gel feeding channel. The output end of the gel feeding channel is provided with a dispersing element. The dispersing element is used to disperse the gel to expose air bubbles. The vacuum port is used to connect to a vacuum device to remove the air bubbles. The piston rod is used to move after the air bubbles are removed, extruding the gel from the outlet.

[0006] In one embodiment, the dispersing component includes a disk body with two or more connecting holes arranged in an array.

[0007] In one embodiment, the inner wall of the feed channel is provided with an internal thread structure, and the outer wall of the disc is provided with an external thread structure. The internal thread structure and the external thread structure are threadedly connected so that the disc body and the piston rod are detachably connected.

[0008] In one embodiment, the gel feeding channel includes a first feeding section and a second feeding section, the second feeding section being located at the output end of the first feeding section and having an open shape, and the dispersing element being disposed at the output end of the second feeding section.

[0009] In one embodiment, the number of vacuum ports is two or more, and the two or more vacuum ports are arranged sequentially along the length of the cylinder.

[0010] In one embodiment, a wear-resistant ceramic layer is provided on the inner wall of the cylinder, and the piston rod is movably disposed on the cylinder and abuts against the wear-resistant ceramic layer.

[0011] In one embodiment, the cylinder body includes a main body, a first end cap, and a second end cap. The first end cap and the second end cap are respectively disposed at both ends of the main body. The piston rod passes through the first end cap and abuts against the inner wall of the main body. The vacuum port is disposed on the main body, and the discharge port is disposed on the second end cap.

[0012] In one embodiment, a first seal is provided between the piston rod and the first end cap; And / or, a second seal is provided between the piston rod and the inner wall of the main body.

[0013] In one embodiment, the input end of the gel feeding channel is provided with a feeding valve, and the outlet is provided with a discharge valve.

[0014] In one embodiment, the connecting hole is elongated or cross-shaped.

[0015] A method for defoaming thermal conductive gel, employing the aforementioned thermal conductive gel defoaming device, the method comprising: The cylinder is evacuated through the vacuum port, creating a vacuum environment inside the cylinder. After the piston rod rises, the gel is fed into the gel feed channel, and the gel containing air bubbles is divided into fine strips by the dispersing element and enters the cylinder. The air bubbles in the gel are removed in a vacuum environment. Press down the piston rod to expel the defoamed gel through the outlet.

[0016] This application has at least the following beneficial effects: This application provides a defoaming device for thermally conductive gel, including a cylinder and a piston rod; the cylinder is provided with a vacuum port and a discharge port, the piston rod is movably disposed on the cylinder and abuts against the inner wall of the cylinder, the piston rod is provided with a gel feeding channel, and the output end of the gel feeding channel is provided with a dispersing element for dispersing the gel to expose air bubbles, and the vacuum port is used to connect to a vacuum device to remove air bubbles; wherein, after removing air bubbles, the piston rod is used to move to expel the gel from the discharge port.

[0017] This application also provides a method for defoaming thermally conductive gel, using the aforementioned thermally conductive gel defoaming device. The method includes: drawing a vacuum in the cylinder through a vacuum port to create a vacuum environment inside the cylinder; after raising the piston rod, feeding gel through the gel feeding channel, causing the gel containing air bubbles to be divided into fine strips by a dispersing element and enter the cylinder, where the air bubbles in the gel are removed under vacuum; and pressing down the piston rod to extrude the defoamed gel through the discharge port.

[0018] This application, through the design of a dispersing element, breaks the gel into thin strips upon entering the cylinder, significantly increasing the specific surface area of ​​the gel and allowing internal air bubbles to be fully exposed to the vacuum environment. This not only accelerates the release and collapse of air bubbles but also avoids the problem of residual air bubbles caused by the high viscosity of the gel, which is a problem in traditional stirring or static defoaming methods. This ensures the thoroughness and consistency of the defoaming process, effectively improving the uniformity and optical properties of the gel.

[0019] Furthermore, the device integrates vacuum defoaming and piston extrusion functions, enabling continuous operation of defoaming and discharging. After defoaming is completed in a vacuum environment, the piston rod can be directly pressed down to extrude the defoamed gel from the discharge port without transferring materials or interrupting the process. This reduces the risk of secondary contamination by outside air, simplifies the operation steps, and lowers equipment complexity and labor costs, making it particularly suitable for the large-scale production of high-purity or sensitive gel materials. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional structural diagram of the thermally conductive gel defoaming device provided in this embodiment; Figure 2 for Figure 1 A magnified view of a portion of region A in the middle; Figure 3 This is an exploded view of the thermally conductive gel defoaming device provided in this embodiment; Figure 4 This is a schematic diagram of the piston rod of the thermally conductive gel defoaming device provided in this embodiment; Figure 5 Schematic diagram of the dispersion component of the thermally conductive gel defoaming device provided in this embodiment Figure 1 ; Figure 6 Schematic diagram of the dispersion component of the thermally conductive gel defoaming device provided in this embodiment Figure 2 ; Figure 7 The flowchart shows the defoaming method for the thermally conductive gel provided in this embodiment.

[0022] Figure label: 1-Cylinder body; 2-Piston rod; 3-Dispersing component; 4-First seal; 5-Second seal; 6-Infeed valve; 7-Outfeed valve; 11-Vacuum port; 12-Outfeed port; 13-Main body; 14-First end cap; 15-Second end cap; 16-Wear-resistant ceramic layer; 21-Gel feeding channel; 31-Disc body; 211-Internal thread structure; 212-First feed section; 213-Second feed section; 311-External thread structure; 312-Connecting hole. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] Currently, common defoaming methods in the industry mainly include settling, stirring, and centrifugation. Settling relies on bubbles rising to the liquid surface and bursting, but this method is time-consuming and often fails to completely remove bubbles from highly viscous gels. While stirring can accelerate bubble movement to some extent, the stirring process itself may introduce new bubbles, resulting in unsatisfactory defoaming effects. Centrifugation uses centrifugal force to separate bubbles, but it carries risks such as expensive equipment, limited processing capacity, and potential adverse effects on the physical structure of the gel.

[0027] Specifically, for specialty materials with high viscosity and high thixotropy, such as thermally conductive gels, the limitations of traditional methods are particularly pronounced. These materials typically have extremely high viscosity, ranging from hundreds of thousands to millions of mPa·s or even higher, and their static state resembles a solid. Their high thixotropy means that the viscosity temporarily decreases under shear forces (such as stirring), but rapidly recovers once the shear force ceases. Simultaneously, these gels usually contain a high proportion of fillers, often exceeding 90% or even 95%, and these fillers often include high-hardness particles (such as alumina and boron nitride) with a Mohs hardness of 8 or higher. These characteristics collectively pose significant challenges to traditional defoaming methods: high viscosity creates immense resistance to bubble movement within the material, rendering static methods almost ineffective; high thixotropy means that bubbles introduced during stirring are quickly "locked" inside the material after viscosity recovery, unable to escape. While centrifugation provides powerful separation force, for thermally conductive gels containing a high proportion of high-hardness fillers, the centrifugal force from high-speed rotation can not only disrupt the uniformity of filler distribution, thus affecting the thermal conductivity of the final product, but also cause extremely severe wear to the centrifuge chamber and rotor. This is one of the core challenges that existing equipment faces in achieving effective degassing and filling. Furthermore, all the above methods share a common drawback: during the transfer of degassed material to packaging or dispensing equipment, it is highly susceptible to secondary air bubble introduction due to contact with air, pouring, pumping, or other operations, rendering the initial degassing efforts futile.

[0028] Based on this, this embodiment provides a thermally conductive gel defoaming device, such as... Figures 1 to 4 As shown, it includes a cylinder body 1 and a piston rod 2; The cylinder 1 is provided with a vacuum port 11 and a discharge port 12. The piston rod 2 is movably provided on the cylinder 1 and abuts against the inner wall of the cylinder 1. The piston rod 2 is provided with a gel feeding channel 21. The output end of the gel feeding channel 21 is provided with a dispersing element 3. The dispersing element 3 is used to disperse the gel to expose the air bubbles. The vacuum port 11 is used to connect to a vacuum device to remove air bubbles. The piston rod 2 is used to move after the air bubbles are removed, and to extrude the gel from the outlet 12.

[0029] like Figure 7As shown, this embodiment also provides a method for defoaming thermal conductive gel, using the above-mentioned thermal conductive gel defoaming device. The method for defoaming thermal conductive gel includes: The cylinder 1 is evacuated through the vacuum port 11, creating a vacuum environment inside the cylinder 1. After the piston rod 2 rises, the gel is fed into the gel through the gel feed channel 21, and the gel containing air bubbles is divided into thin strips by the dispersing element 3 and enters the cylinder 1. The air bubbles in the gel are removed in a vacuum environment. The piston rod 2 is pressed down to extrude the defoamed gel through the outlet 12 and transport it to the canning or dispensing equipment.

[0030] In one embodiment, the inner diameter of cylinder 1 is 80 mm and the height of cylinder 1 is 300 mm. This aspect ratio design ensures that the gel has sufficient residence time for degassing in a vacuum environment, while avoiding excessive compressive stress on piston rod 2 during material feeding due to excessive cylinder 1 length, thus preventing "jamming".

[0031] In one embodiment, the driving method of the piston rod 2 is selected according to the required pushing force and control precision, and can be hydraulic, pneumatic, or electric servo, but is not limited to these. For high-viscosity thermally conductive gels, a larger pushing force is usually required, so hydraulic drive is the preferred option.

[0032] This application, through the arrangement of the dispersant 3, breaks the gel into thin strips upon entering the cylinder 1, greatly increasing the specific surface area of ​​the gel and allowing internal air bubbles to be fully exposed to the vacuum environment. This application not only accelerates the release and collapse of air bubbles but also avoids the problem of residual air bubbles caused by the high viscosity of the gel in traditional stirring or static defoaming methods, thereby ensuring the thoroughness and consistency of the defoaming process and effectively improving the uniformity and optical properties of the gel.

[0033] Furthermore, the device integrates vacuum defoaming and piston extrusion functions, enabling continuous operation of defoaming and discharging. After defoaming is completed in a vacuum environment, the piston rod 2 can be directly pressed down to extrude the defoamed gel from the discharge port 12 without transferring materials or interrupting the process. This reduces the risk of secondary contamination by outside air, simplifies the operation steps, and lowers equipment complexity and labor costs, making it particularly suitable for the large-scale production of high-purity or sensitive gel materials.

[0034] like Figures 1 to 4 As shown, in one embodiment, the input end of the gel feeding channel 21 is provided with a feeding valve 6, and the outlet 12 is provided with a discharge valve 7.

[0035] Specifically, feed valve 6 is a ball valve, but it is not limited to this.

[0036] Specifically, discharge valve 7 is a needle valve, but it is not limited to this.

[0037] In one embodiment, the thermal conductive gel defoaming device includes a control system, which is connected to the feed valve 6 and the discharge valve 7 respectively. When the thermal conductive gel defoaming device is in the feeding stage, the feed valve 6 is open and the discharge valve 7 is closed; when the thermal conductive gel defoaming device is in the discharge stage, the discharge valve 7 is open and the feed valve 6 is closed.

[0038] Specifically, a method for defoaming thermal conductive gel using this embodiment includes: Close the discharge valve 7, open the feed valve 6, and evacuate the cylinder 1 through the vacuum port 11 to create a vacuum environment inside the cylinder 1. After the piston rod 2 rises, the gel is fed into the gel through the gel feed channel 21, and the gel containing air bubbles is divided into thin strips by the dispersing element 3 and enters the cylinder 1. The air bubbles in the gel are removed in a vacuum environment. Close the feed valve 6, open the discharge valve 7, press down the piston rod 2, and squeeze the defoamed gel through the discharge port 12.

[0039] like Figures 1 to 4 As shown, in one embodiment, a wear-resistant ceramic layer 16 is provided on the inner wall of the cylinder 1 to form a cylinder 1 sidewall with a double-layer structure, and the piston rod 2 is movably disposed on the cylinder and abuts against the wear-resistant ceramic layer 16.

[0040] Because the thermally conductive gel contains a large amount of high-hardness fillers (such as particles with a Mohs hardness of 8 or higher), when the piston rod 2 moves up and down within the cylinder 1, pushing the gel, the high-hardness fillers exert a strong abrasive effect on the cylinder wall. This embodiment uses wear-resistant ceramic as the liner, which can greatly resist this type of wear and significantly extend the service life of the cylinder 1. At the same time, it avoids the mixing of metal particles generated after the wear of traditional metal cylinders into the gel material, thus effectively preventing material contamination and ensuring the high purity and reliability of the final product.

[0041] like Figures 1 to 4 As shown, in one embodiment, the cylinder body 1 includes a main body 13, a first end cover 14 and a second end cover 15. The first end cover 14 and the second end cover 15 are respectively disposed at both ends of the main body 13. The piston rod 2 passes through the first end cover 14 and abuts against the inner wall of the main body 13. The vacuum port 11 is disposed on the main body 13 and the discharge port 12 is disposed on the second end cover 15.

[0042] Specifically, both the first end cap 14 and the second end cap 15 are equipped with fasteners, which are mounted on the main body 13. The fasteners are bolts.

[0043] like Figures 1 to 4 As shown, in one embodiment, a first seal 4 is provided between the piston rod 2 and the first end cap 14; a second seal 5 is provided between the piston rod 2 and the inner wall of the main body 13.

[0044] Specifically, both the first seal 4 and the second seal 5 are O-rings.

[0045] In one embodiment, there are two first seals 4, which are spaced apart along the length of the cylinder body 1.

[0046] In one embodiment, there are two second seals 5, which are spaced apart along the length of the cylinder body 1.

[0047] This embodiment utilizes a detachable cylinder structure, making the device easy to assemble and disassemble, facilitating thorough cleaning and maintenance, and avoiding material residue and cross-contamination. The sealing design ensures the stability of the vacuum environment, prevents air leakage, and guarantees effective degassing. This simple and reliable structure reduces equipment complexity and cost, making it particularly suitable for intermittent production scenarios.

[0048] like Figures 1 to 4 As shown, in one embodiment, there are two or more vacuum ports 11, which are arranged sequentially along the length of the cylinder body 1.

[0049] In one embodiment, the two or more vacuum ports 11 include a first vacuum port and a second vacuum port, wherein the distance between the first vacuum port and the discharge port 12 is 200mm, and the distance between the second vacuum port and the discharge port 12 is 280mm.

[0050] This embodiment achieves uniform vacuum distribution within the cylinder 1 through a multi-vacuum port design, which is particularly effective in removing air bubbles at different depths during gel filling. This reduces the degassing blind zone, improves the thoroughness of degassing, and ensures the thermal conductivity and long-term reliability of the thermally conductive gel. The multi-stage vacuum design also adapts to different filling heights, enhancing the device's versatility.

[0051] like Figures 1 to 4 As shown, in one embodiment, the gel feeding channel 21 includes a first feeding section 212 and a second feeding section 213. The second feeding section 213 is located at the output end of the first feeding section 212 and is open. The dispersing member 3 is disposed at the output end of the second feeding section 213.

[0052] Specifically, the first feed section 212 is a straight pipe with a diameter matching the feed valve 6; the second feed section 213 is located at the output end of the first feed section 212 and is open (i.e., funnel-shaped structure) to guide the gel flow to the dispersant 3.

[0053] This embodiment optimizes the structure of the gel feed channel 21, reducing resistance during the gel feeding process and ensuring smooth gel entry into the cylinder 1. The open-ended second feed section 213 helps the gel distribute evenly onto the dispersant 3, preventing localized blockages and further improving degassing uniformity and efficiency. This embodiment is particularly suitable for high-viscosity gels, reducing feed pressure requirements and enhancing equipment stability.

[0054] like Figures 1 to 4 As shown, in one embodiment, the dispersing component 3 includes a disk body 31, on which two or more connecting holes 312 are provided, and the two or more connecting holes 312 are arranged in an array.

[0055] In this embodiment, the array of interconnecting holes 312 ensures that the gel is uniformly divided into thin strips, further optimizing the bubble exposure effect and improving the degassing efficiency.

[0056] like Figures 1 to 4 As shown, in one embodiment, the connecting hole 312 is circular, and the diameter of the connecting hole 312 is between 1-5 mm.

[0057] Because if the pore size is too small (e.g., less than 1 mm), a very high feed pressure is required for the high-viscosity gel to pass through, and it is prone to clogging; if the pore size is too large (e.g., greater than 5 mm), the resulting gel strip is too thick, the internal air bubbles are not sufficiently exposed, and the degassing effect is reduced. Preferably, the pore size of the connecting hole 312 is 3 mm.

[0058] Specifically, the distance between adjacent connecting holes is 10mm.

[0059] In another embodiment, the connecting hole 312 is elongated (e.g., Figure 5 (as shown) or cross-shaped (as shown) Figure 6 As shown in the figure, this increases the contact area between the gel strip and the vacuum environment, making it particularly suitable for high-viscosity, high-thixotropic gel materials. On the one hand, the enhanced contact area helps to more effectively eliminate extremely small air bubbles inside the gel; on the other hand, by eliminating the aforementioned micropores, it helps to reduce the expansion and contraction of the gel due to high and low temperature cycling during subsequent applications, thereby improving the stability and reliability of the material under temperature changes.

[0060] like Figures 1 to 4 As shown, in one embodiment, the inner wall of the feed channel is provided with an internal thread structure 211, and the outer wall of the disc 31 is provided with an external thread structure 311. The internal thread structure 211 and the external thread structure 311 are threaded together so that the disc 31 and the piston rod 2 can be detachably connected.

[0061] This embodiment features a detachable dispersion component 3, which facilitates the replacement of discs 31 with different pore sizes to accommodate thermally conductive gels of varying viscosities.

[0062] like Figures 1 to 4 As shown, in one embodiment, the thermally conductive gel defoaming device is equipped with a manifold. One inlet of the manifold is connected to the outlet 12 of one thermally conductive gel defoaming device, and the other inlet of the manifold is connected to the outlet 12 of another thermally conductive gel defoaming device. The two thermally conductive gel defoaming devices alternately operate in the feeding and discharging processes.

[0063] Its working principle is as follows: two (or more) sets of equipment are coordinated and controlled by a central control system. When equipment A completes feeding and degassing and begins its discharge process, equipment B simultaneously begins its feeding and degassing processes. Once equipment A has finished discharging, equipment B is ready to begin discharging, at which point equipment A immediately enters the next feeding cycle. The discharge flows from the two equipment sets are merged through a confluence device, forming a nearly continuous material flow output downstream.

[0064] This embodiment overcomes the inherent waiting time of intermittent operation of single equipment by connecting devices in parallel, thereby increasing the average processing capacity from 1-2 kg per minute for a single machine to 3-5 kg ​​per minute after parallel connection, realizing continuous production, greatly improving processing efficiency, and meeting the needs of large-scale manufacturing.

[0065] In summary, the thermally conductive gel degassing device and method provided in this application creatively integrates vacuum dispersion degassing with piston-sealed extrusion, targeting the characteristics of high-viscosity, high-thixotropic thermally conductive gels, forming a highly efficient, reliable, and easy-to-maintain solution. It not only effectively solves the industry pain points of traditional degassing methods—low efficiency, poor results, and easy secondary introduction of air bubbles—but also, through modular and automated design, provides a stable and high-quality supply of thermally conductive interface materials for industries with extremely high material reliability requirements, such as high-end electronics manufacturing and new energy fields, demonstrating significant industrial application value.

[0066] Note that the above description is merely a preferred embodiment and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of this application, and the scope of this application is determined by the scope of the appended claims.

[0067] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A thermally conductive gel defoaming device, characterized in that, Including the cylinder block and piston rod; The cylinder is provided with a vacuum port and a discharge port. The piston rod is movably mounted on the cylinder and abuts against the inner wall of the cylinder. The piston rod is provided with a gel feeding channel. The output end of the gel feeding channel is provided with a dispersing element. The dispersing element is used to disperse the gel to expose air bubbles. The vacuum port is used to connect to a vacuum device to remove the air bubbles. The piston rod is used to move after the air bubbles are removed, so as to squeeze the gel out of the outlet; The dispersing component includes a disk body, on which two or more connecting holes are provided, and the two or more connecting holes are arranged in an array. The inner wall of the feed channel is provided with an internal thread structure, and the outer wall of the disc is provided with an external thread structure. The internal thread structure and the external thread structure are threadedly connected so that the disc body and the piston rod can be detachably connected.

2. The thermally conductive gel defoaming device according to claim 1, characterized in that, The gel feeding channel includes a first feeding section and a second feeding section. The second feeding section is located at the output end of the first feeding section and is open. The dispersing element is disposed at the output end of the second feeding section.

3. The thermally conductive gel defoaming device according to claim 1, characterized in that, The inner wall of the cylinder is provided with a wear-resistant ceramic layer, and the piston rod is movably disposed on the cylinder and abuts against the wear-resistant ceramic layer.

4. The thermally conductive gel defoaming device according to claim 1, characterized in that, The cylinder body includes a main body, a first end cap, and a second end cap. The first end cap and the second end cap are respectively disposed at both ends of the main body. The piston rod passes through the first end cap and abuts against the inner wall of the main body. The vacuum port is disposed on the main body, and the discharge port is disposed on the second end cap.

5. The thermally conductive gel defoaming device according to claim 4, characterized in that, A first sealing element is provided between the piston rod and the first end cap; And / or, a second seal is provided between the piston rod and the inner wall of the main body.

6. The thermally conductive gel defoaming device according to claim 1, characterized in that, The number of vacuum ports is two or more, and the two or more vacuum ports are arranged sequentially along the length of the cylinder body. And / or, the input end of the gel feeding channel is provided with a feeding valve, and the outlet is provided with a discharge valve.

7. The thermally conductive gel defoaming device according to claim 1, characterized in that, The connecting hole is elongated or cross-shaped.

8. A method for defoaming thermally conductive gel, characterized in that, The thermally conductive gel defoaming device as described in any one of claims 1-7, wherein the thermally conductive gel defoaming method comprises: The cylinder is evacuated through the vacuum port, creating a vacuum environment inside the cylinder. After the piston rod rises, the gel is fed into the gel feed channel, and the gel containing air bubbles is divided into fine strips by the dispersing element and enters the cylinder. The air bubbles in the gel are removed in a vacuum environment. Press down the piston rod to expel the defoamed gel through the outlet.

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