Test device for liquid heat conducting material

Abstract

The utility model discloses a kind of testing devices for liquid heat-conducting material, including the standing frame body for standing, the cylinder for liquid heat-conducting material and top opening, the piston for being loaded into cylinder from opening and for making the liquid heat-conducting material in cylinder flow to the bottom of cylinder and with the top of cylinder detachable assembly connection and seal the opening of top cover. Top cover is equipped with the air inlet valve of the gas guide pipe connection of air compressor and with the internal space of cylinder intercommunication;The sidewall of cylinder is equipped with the oil filter outlet head of the internal space intercommunication of cylinder and the window for observing liquid heat-conducting material in cylinder, window is located above oil filter outlet head and is equipped with multiple scale lines, which are arranged separately in the up-down direction of cylinder, filter is assembled on oil filter outlet head;The bottom of cylinder is equipped with the outlet needle of the internal space intercommunication of cylinder, and control valve is equipped on outlet needle. The testing device for liquid heat-conducting material of the utility model has the advantages of time-consuming evaluation is small and accuracy is high.

Description

Technical Field

[0001] This utility model relates to the technical field of production testing of liquid thermal conductive materials, and in particular to a testing device for liquid thermal conductive materials that can simulate actual application scenarios to perform oil-powder separation tests on liquid thermal conductive materials. Background Technology

[0002] As is well known, thermally conductive materials are widely used in smartphones, new energy vehicle battery swapping equipment, high-power electronic devices, home appliances, industrial heat dissipation equipment and other fields. They are used to transfer and dissipate heat through gap-filling thermally conductive materials, potting thermally conductive materials and other methods to meet the heat transfer and dissipation needs of smartphones, new energy vehicle battery swapping equipment, high-power electronic devices, home appliances, industrial heat dissipation equipment and other fields.

[0003] Currently, thermally conductive materials can be classified into silicone-based thermally conductive potting compounds, thermally conductive gels, polyurethane adhesives, and thermally conductive epoxy resin adhesives. Their main components are a mixture of liquid resin and solid thermally conductive powder fillers. Therefore, during the dispensing process in dispensing equipment, due to the pressure maintained in the dispensing equipment for both supplying and dispensing adhesive, the liquid resin and solid thermally conductive powder fillers are prone to phase separation under high pressure, which disrupts the stability of the system. This causes the lighter base material components to float to the top, while the heavier filler particles sink. This phenomenon is called oil-powder separation, also known as pumping oil.

[0004] Oil-powder separation is mainly related to external pressure and the design of the formulation itself. When the pressure set on the dispensing equipment is too high, oil-powder separation can easily cause blockages, severely affecting production efficiency. An unreasonable design of the thermal conductive material formulation, such as selecting unsuitable powder morphology and particle size, or an excessively high oil pumping rate, can also easily lead to oil-powder separation, affecting the material's thermal conductivity and ultimately impacting product performance.

[0005] Therefore, in order to evaluate the oil-powder separation of liquid thermal conductive materials, common methods include long-term static observation, accelerated settling on a vibration platform, and accelerated oil-powder separation by centrifugation. However, these methods have the drawbacks of being time-consuming and having poor evaluation accuracy because the energy applied externally to generate oil-powder separation does not match the actual application.

[0006] Therefore, there is an urgent need for a testing device for liquid thermal conductive materials to overcome one or more of the above-mentioned defects. Utility Model Content

[0007] The purpose of this invention is to provide a testing device for evaluating liquid thermally conductive materials that is time-efficient and highly accurate.

[0008] To achieve the above objectives, the testing device for liquid thermal conductive materials of this utility model includes a standing frame, a cylinder with an open top for holding the liquid thermal conductive material, a piston for applying force to make the liquid thermal conductive material flow to the bottom of the cylinder, and a top cover detachably connected to the top of the cylinder and sealing the opening. The top cover is provided with an air inlet valve for connecting an air compressor's air pipe and communicating with the internal space of the cylinder. The side wall of the cylinder is provided with an oil filter outlet communicating with the internal space of the cylinder and a viewing window for observing the liquid thermal conductive material inside the cylinder. The viewing window is located above the oil filter outlet and has multiple scale lines spaced vertically above and below the cylinder. A filter is installed on the oil filter outlet, and an outlet needle communicating with the internal space of the cylinder is provided at the bottom of the cylinder, with a control valve on the outlet needle.

[0009] Compared with existing technologies, this invention simulates the dispensing port of a dispensing device by using an outlet needle, and adjusts the outlet needle with a control valve to simulate different diameter dispensing needles configured in the dispensing device. By recording the weight of the material flowing out per unit time, the flow rate can be calculated. Simultaneously, an oil filter outlet simulates the irregular connections or easily loosened seals within the pipes of the dispensing device, which are difficult to observe. Oily substances seeping through the oil filter outlet can be collected and weighed to calculate the oil seepage rate. Furthermore, the liquid level of the liquid thermally conductive material inside the cylinder can be observed through a viewing window, and the height of the separated oil layer can be visually recorded through a graduated window, allowing for the calculation of the oil separation degree. Additionally, by introducing air pressure into the cylinder through the air inlet valve, different air pressure values ​​can be tested to record the corresponding oil separation degree, oil seepage rate, and dispensing flow rate. Therefore, this invention's testing device for liquid thermally conductive materials has the advantages of short evaluation time and high accuracy.

[0010] Preferably, the top cover is threadedly connected to the top of the cylinder.

[0011] Preferably, the top cover is also provided with a pressure relief valve that communicates with the internal space of the cylinder.

[0012] Preferably, the oil filter outlet and the viewing window are located on the same side of the cylinder.

[0013] Preferably, the spacing between two adjacent scale lines is 0.1 mm.

[0014] Preferably, the filter includes a first filter screen, a second filter screen, and filter paper, with the filter paper sandwiched between the first filter screen and the second filter screen.

[0015] Preferably, both the first filter and the second filter are metal filters.

[0016] Preferably, the pore size density of the first filter screen and the second filter screen is 3000 mesh to 4000 mesh, and the pore size of the filter paper is 5000 mesh to 6000 mesh.

[0017] Preferably, the standing frame includes a standing base, an upright connected to the standing base and protruding upward from the standing base, and a cantilever assembled and connected to the upright at a position away from the standing base. The cantilever extends horizontally, and a first sidewall and a second sidewall spaced apart from each other are provided on the cantilever at a position away from the upright. The cylindrical body is located between the first sidewall and the second sidewall, and the cylindrical body is also assembled and connected to the first sidewall and the second sidewall respectively.

[0018] Preferably, the cylinder is assembled and connected to the first sidewall and the second sidewall respectively by means of fasteners.

[0019] Preferably, the standing base is a U-shaped platform.

[0020] Preferably, anti-slip pads are provided at the four corners below the standing base.

[0021] Preferably, the support frame has a perforated through hole for the cantilever to pass through and for the cantilever to slide up and down for adjustment.

[0022] Preferably, the hollowed-out through hole is a rectangular hole, and the cantilever is a round shaft structure.

[0023] Preferably, the cantilever is fitted with a rotating abutting member that is threadedly connected to the cantilever, and the rotating abutting member fixes the cantilever to the upright by pressing against the upright. Attached Figure Description

[0024] Figure 1 This is a perspective view of the testing device for the liquid thermally conductive material of this utility model.

[0025] Figure 2 yes Figure 1 The diagram shows a plan view of the liquid thermally conductive material as seen from the direction indicated by arrow C using a testing device.

[0026] Figure 3 yes Figure 1 The diagram shows a liquid thermally conductive material viewed from the opposite direction of arrow A using a testing device.

[0027] Figure 4 It is along Figure 3 Internal view showing the liquid thermally conductive material when cut along the DD line.

[0028] Figure 5 yes Figure 4 Internal view behind the concealed liquid thermal conductive material and piston.

[0029] Figure 6 This is a perspective view of the standing frame in the testing device for liquid thermal conductive materials of this utility model.

[0030] Figure 7 yes Figure 6 A three-dimensional view of the standing frame shown from another angle.

[0031] Figure 8 yes Figure 6 The plan view of the standing frame as shown in the direction of arrow B. Detailed Implementation

[0032] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0033] Please see Figures 1 to 4 The testing device 100 for liquid thermal conductive materials of this invention includes a standing frame 10, a cylinder 20, a piston 30, and a top cover 40. The standing frame 10 is for standing, so that the testing device 100 for liquid thermal conductive materials of this invention can stand on an external support (such as, but not limited to, a table) through the standing frame 10.

[0034] The cylinder 20 is used to hold liquid heat-conducting material 200. The top 21 of the cylinder 20 has an opening 211 to allow the liquid heat-conducting material 200 to be loaded into the cylinder 20 through the opening 211. The side wall 24 of the cylinder 20 is provided with an oil filter outlet 25 communicating with the internal space 23 of the cylinder 20 and a viewing window 26 for observing the liquid heat-conducting material 200 inside the cylinder 20. The bottom 22 of the cylinder 20 is provided with an outlet needle 28 communicating with the internal space 23 of the cylinder 20. The outlet needle 28 is provided with a control valve 29 to open or close the outlet needle 28 and to adjust the opening size of the outlet needle 28. Optionally, as an example, the control valve 29 can be an automatic control valve or a manual control valve.

[0035] The viewing window 26 is located above the oil filter outlet 25, and optionally... Figure 1 and Figure 2 In this example, the viewing window 26 and the oil filter outlet 25 are located on the same side of the cylinder 20, such as, but not limited to, the front side of the cylinder 20, so that the operator can collect and weigh the oily substance flowing out of the oil filter outlet 25 and observe and record the changes in the liquid heat-conducting material 200 inside the cylinder 20. Obviously, depending on actual needs, the positional relationship between the viewing window 26 and the oil filter outlet 25 can be other than that, so it is not considered as such. Figure 1 and Figure 2 As shown is for reference only. Additionally, window 26 also has multiple scale lines 261 arranged vertically on the cylinder 20. Optionally, [the scale lines can be displayed on the cylinder 20]. Figure 2 In this example, the spacing between two adjacent scale lines 261 is 0.1 mm to improve the operator's accuracy in recording changes in the liquid heat-conducting material 200 inside the cylinder 20. Obviously, depending on actual needs, the spacing between two adjacent scale lines 261 can be other values, therefore it is not specified here. Figure 2 The above is for reference only. Additionally, a filter 27 is fitted onto the oil filter outlet 25, which can optionally be used to filter the oil. Figure 3 As an example, filter 27 includes a first filter screen 271, a second filter screen 272, and filter paper 273. Filter paper 273 is sandwiched between the first filter screen 271 and the second filter screen 272 to improve the filtration effect of filter 27. The first filter screen 271 and the second filter screen 272 are each metal filter screen to increase the reliability of filter paper 273 being clamped by the first filter screen 271 and the second filter screen 272. Obviously, depending on actual needs, filter 27 can also be other structures well known in the art.

[0036] Piston 30 is inserted into cylinder 20 through opening 211. Piston 30 applies force (i.e., applies pressure) to the liquid heat-conducting material 200 inside cylinder 20, causing the liquid heat-conducting material 200 to flow towards the bottom 22 of cylinder 20 under pressure, thereby satisfying the need for the liquid heat-conducting material 200 to flow out through the outlet needle 28 opened by control valve 29. It should be noted that, because the liquid heat-conducting material 200 inside cylinder 20 flows towards the bottom 22 of cylinder 20 under pressure, piston 30 and side wall 24 of cylinder 20 are in a sealed sliding fit. This sliding fit relationship is the same as the fit between cylinder body and piston body in hydraulic cylinder, so it will not be described again here.

[0037] The top cover 40 and the top 21 of the cylinder 20 are detachably connected. Alternatively, as an example, the top cover 40 and the top 21 of the cylinder 20 are threaded together, which facilitates the assembly, disassembly and sealing of the top cover 40 and the top 21 of the cylinder 20, and makes it easier for the operator to remove the piston 30 from the cylinder 20 before loading the liquid heat-conducting material 200 into the cylinder 20. Obviously, depending on actual needs, the assembly connection between the top cover 40 and the top 21 of the cylinder 20 can also be of other types known in the art. Additionally, the top cover 40 seals the opening 211. The top cover 40 is equipped with an intake valve 41 that connects to the air compressor's air pipe and communicates with the internal space 23 of the cylinder 20. This allows the air compressor to apply air pressure to the piston 30 via the intake valve 41, thereby causing the piston 30 to exert pressure on the liquid heat-conducting material 200 inside the cylinder 20 under air pressure. This satisfies the requirement that the liquid heat-conducting material 200 inside the cylinder 20 flows out through the outlet needle 28 opened by the control valve 29, simulating dispensing. More specifically, see the description below.

[0038] like Figures 1 to 5As shown, as an example, the top cover 40 is also provided with a pressure relief valve 42 that communicates with the internal space 23 of the cylinder 20. Therefore, the pressure relief valve 42 is used to leak the gas inside the cylinder 20 in preparation for the next test.

[0039] like Figure 3 As shown, as an example, the pore size density of the first filter screen 271 and the second filter screen 272 is 3000 mesh to 4000 mesh, such as, but not limited to, 3000 mesh, 3200 mesh, 3400 mesh, 3500 mesh, 3600 mesh, 3800 mesh or 4000 mesh; the pore size of the filter paper 273 is 5000 mesh to 6000 mesh, such as, but not limited to, 5000 mesh, 5200 mesh, 5400 mesh, 5600 mesh, 5800 mesh or 6000 mesh; thus, this design effectively improves the filtration effect.

[0040] like Figures 1 to 8 As shown, as an example, the standing frame 10 includes a standing base 11, an upright 12 connected to and protruding upward from the standing base 11, and a cantilever 13 assembled and connected to the upright 12 at a position away from the standing base 11. The cantilever 13 extends horizontally, and a first sidewall 14 and a second sidewall 15 spaced apart from each other are provided on the cantilever 13 at a position away from the upright 11. The cylindrical body 20 is located between the first sidewall 14 and the second sidewall 15, and the cylindrical body 20 is also assembled and connected to the first sidewall 14 and the second sidewall 15 respectively, so that the cylindrical body 20 is suspended by means of the first sidewall 14 and the second sidewall 15. Specifically, in Figure 4 and Figure 5 As an example, the cylinder 20 is assembled and connected to the first side wall 14 and the second side wall 15 respectively by means of fasteners 16 (such as, but not limited to, screws) to improve the convenience of assembling and disassembling the cylinder 20 with the first side wall 14 and the second side wall 15 respectively; in addition, the standing base 11 is a U-shaped platform, and anti-slip pads 111 are provided at the four corners of the standing base 11 to increase the stability of the standing base 11 standing on the external support; furthermore, the frame 12 is provided with a hollow through hole 121 for the cantilever 13 to pass through and for the cantilever 13 to slide up and down for adjustment. This design allows the position of the cantilever 13 to be adjusted on the frame 12, so that components such as the cylinder 20, piston 30 and top cover 40 can be adjusted together with the cantilever 13.

[0041] In order to facilitate the installation and removal of the cantilever 13 from the support frame 12, and to adjust the position of the cantilever 13 extending relative to the support frame 12, Figure 3 and Figure 8 In one example, the cantilever 13 is fitted with a rotating abutment 17 threadedly connected to the cantilever 13. The rotating abutment 17 fixes the cantilever 13 to the upright 12 by pressing against it. Alternatively, in Figure 3 and Figure 8In the middle, there are two rotating pressing parts 17 to meet the need for the upright frame 12 to be clamped by two rotating pressing parts 13; in addition, the rotating pressing parts 17 can be nut structures; furthermore, the hollow through hole 121 is a rectangular hole and the cantilever 13 is a round shaft structure to make the cantilever 13 adjust up and down more smoothly.

[0042] The working process of the testing device 100 for liquid thermal conductive materials of this invention will be described with reference to the accompanying drawings.

[0043] Preparation before testing: Close the needle outlet 28 with control valve 29, and fill the internal space 23 of the cylinder 20 with the liquid thermal conductive material 200 to be tested, ensuring that the liquid level of the liquid thermal conductive material 200 is in the middle of the viewing window 26. Next, insert the piston 30 into the internal space 23 of the cylinder 20; then, tighten the top cover 40 onto the top 211 of the cylinder 20 and close the pressure relief valve 42. Then, connect the air pipe of the external air compressor to the air inlet valve 41 and adjust the cylinder 20 to a suitable position, thus completing the preparation work before testing.

[0044] In test scenario one, suitable dispensing parameters were matched for the same liquid thermal conductive material 200 at the manufacturing end. After completing the pre-test preparations, air pressure was introduced, and the control valve 29 was adjusted to control the flow rate of the liquid thermal conductive material 200 within the specified manufacturing range. The air pressure value inside the injection cylinder 20 was adjusted stepwise from low to high. When oil leakage occurred at the oil filter outlet 25 or a separated oil layer appeared at the viewing window 26, the air pressure value at this time could be set to the maximum pressure value that the liquid thermal conductive material 200 could withstand in the dispensing equipment. Within this pressure value, the liquid thermal conductive material 200 was less likely to experience oil pumping phenomenon (i.e., oil-powder separation) in the dispensing equipment.

[0045] In test scenario two, after selecting a suitable air pressure value for the dispensing equipment based on test scenario one, the pressure value was kept constant, and the control valve 29 at the outlet needle 28 was closed. The changes in oil leakage from the oil filter outlet 25 or oil layer separation from the viewing window 26 over time were recorded. The duration calculated from the point when oil leakage occurs at the oil filter outlet 25 or oil layer separation occurs at the viewing window 26 can be defined as the longest time the dispensing equipment can remain shut down without depressurization during the manufacturing process. Within this time, the liquid thermally conductive material 200 is less likely to experience pumping oil within the dispensing equipment.

[0046] Test Scenario 3: Screening for the optimal oil pump resistance formula during the experimental development of liquid thermal conductive material 200. This involves switching between different formulas of liquid thermal conductive material 200 based on Test Scenario 1 and testing their maximum withstand pressure. The higher the pressure value, the better the oil pump resistance of the corresponding formula.

[0047] In test scenario four, based on test scenario one, the control valve 29 at the outlet needle 28 is closed, the air pressure is set to the maximum pressure value and kept constant, and different formulations of liquid heat-conducting materials 200 are switched; the same amount of time is maintained, and the oil separation degree and oil leakage rate data are recorded and calculated. The smaller the oil separation degree and oil leakage rate, the better the anti-pumping oil rate of the corresponding formulation material.

[0048] Compared with existing technologies, this method simulates the dispensing port of a dispensing device by using the outlet needle 28, and adjusts the outlet needle 28 via the control valve 29 to simulate different diameter dispensing needles configured in the dispensing device. By recording the weight of the material flowing out per unit time, the flow rate can be calculated. Simultaneously, the oil filter outlet 25 simulates the irregular connections or easily loosened seals within the pipes of the dispensing device, which are difficult to observe. Oily substances seeping through the oil filter outlet 25 can be collected and weighed to calculate the oil seepage rate. Furthermore, the liquid level of the liquid heat-conducting material 200 inside the cylinder 20 can be observed through the viewing window 26, and the height of the separated oil layer can be visually recorded through the viewing window 26 with scale lines 261, allowing for the calculation of the oil separation degree. Additionally, when air pressure is introduced into the cylinder 20 through the air inlet valve 41, different air pressure values ​​can be tested to record the corresponding oil separation degree, oil seepage rate, and dispensing flow rate. Therefore, the testing device 100 for liquid thermal conductive materials of this invention has the advantages of short evaluation time and high accuracy.

[0049] It should be noted that arrow A in the attached diagram points in the direction from bottom to top for the standing frame 10, which is also the direction from bottom to top for the cylinder 20; arrow B in the attached diagram points in the direction from left to right for the standing frame 10; and arrow C in the attached diagram points in the direction from front to back for the standing frame 10.

[0050] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.

Claims

1. A testing device for liquid thermally conductive materials, characterized in that, The device includes a standing frame, a cylindrical body with an open top for holding liquid heat-conducting material, a piston for applying force to make the liquid heat-conducting material flow to the bottom of the cylindrical body, and a top cover that is detachably connected to the top of the cylindrical body and seals the opening. The top cover is provided with an air inlet valve for connecting an air compressor's air pipe and communicating with the internal space of the cylindrical body. The side wall of the cylindrical body is provided with an oil filter outlet communicating with the internal space of the cylindrical body and a viewing window for observing the liquid heat-conducting material in the cylindrical body. The viewing window is located above the oil filter outlet and has multiple scale lines arranged vertically on the cylindrical body. A filter is installed on the oil filter outlet. The bottom of the cylindrical body is provided with an outlet needle communicating with the internal space of the cylindrical body, and the outlet needle is provided with a control valve.

2. The testing device for liquid thermally conductive materials according to claim 1, characterized in that, The top cover is threaded to the top of the cylinder, and the top cover is also provided with a pressure relief valve that communicates with the internal space of the cylinder.

3. The testing device for liquid thermally conductive materials according to claim 1, characterized in that, The oil filter outlet and the viewing window are located on the same side of the cylinder; the distance between two adjacent scale lines is 0.1 mm.

4. The testing device for liquid thermally conductive materials according to claim 1, characterized in that, The filter comprises a first filter screen, a second filter screen, and filter paper, with the filter paper sandwiched between the first filter screen and the second filter screen; the first filter screen and the second filter screen are each metal filter screen, with a pore size density of 3000 mesh to 4000 mesh, and the filter paper has a pore size of 5000 mesh to 6000 mesh.

5. The testing device for liquid thermally conductive materials according to claim 1, characterized in that, The standing frame includes a standing base, an upright connected to the standing base and protruding upward from the standing base, and a cantilever assembled and connected to the upright at a position away from the standing base. The cantilever extends in a horizontal direction and has a first sidewall and a second sidewall spaced apart from each other at a position away from the upright. The cylindrical body is located between the first sidewall and the second sidewall and is also assembled and connected to the first sidewall and the second sidewall respectively.

6. The testing apparatus for liquid thermally conductive materials according to claim 5, characterized in that, The cylinder is assembled and connected to the first side wall and the second side wall respectively by means of fasteners.

7. The testing apparatus for liquid thermally conductive materials according to claim 5, characterized in that, The standing base is a U-shaped platform, and anti-slip pads are provided at the four corners below the standing base.

8. The testing apparatus for liquid thermally conductive materials according to claim 5, characterized in that, The support frame has a perforated through hole for the cantilever to pass through and for the cantilever to slide up and down for adjustment.

9. The testing apparatus for liquid thermally conductive materials according to claim 8, characterized in that, The hollowed-out through hole is a rectangular hole, and the cantilever is a round shaft structure.

10. The testing apparatus for liquid thermally conductive materials according to claim 9, characterized in that, The cantilever is fitted with a rotating abutting member that is threadedly connected to the cantilever. The rotating abutting member fixes the cantilever to the upright by pressing against the upright.

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