Mold for evaluating insulativity of polymer
By setting a conductive insert in the polymer insulation evaluation mold, the problem of uncertain molding quality of the insulation layer when the polymer is molded into the product is solved, efficient insulation evaluation and power-on testing are achieved, and production costs are reduced.
Patent Information
- Application Number
- CN202422311177.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-09-23
AI Technical Summary
When evaluating the insulation properties of polymers in existing technologies, the molding quality of the insulation layer formed on the product is uncertain, resulting in performance deviations, increased production costs and reduced production efficiency.
A mold for evaluating the insulation properties of polymers is designed. The mold comprises a first module, a second module, and a conductive insert. By placing the conductive insert in the mold cavity, the polymer is directly molded onto the outer surface of the extended portion of the conductive insert, simulating the insulation layer on the product. Electrical testing is then performed through the conductive insert.
It enables accurate judgment of the insulation layer quality during polymer molding, reduces the cost of multiple mold openings, and improves the accuracy and efficiency of evaluation.
Smart Images
Figure CN223346794U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of polymer evaluation devices, in particular to a mold used for evaluating the insulation properties of polymers. Background Art
[0002] Currently, when evaluating the insulation properties of polymers with different formulations, the polymers are usually first injection-molded into sample bars, and then the sample bars are subjected to electrical testing to detect the differences in insulation properties of different polymers. However, when the polymers screened in this way are applied to specific products, the insulation layer molded on the product may have uncertain molding quality, such as surface defects. The performance of the insulation layer molded on the product may easily deviate from the performance during testing, resulting in the insulation properties of the polymer failing to meet the standards, necessitating readjustment of the polymer, which in turn increases production costs and reduces production efficiency. Utility Model Content
[0003] The purpose of the utility model is to provide a polymer insulation evaluation mold, which can not only simulate the molding quality of the insulation layer of the polymer when it is molded into a product, but also facilitate subsequent power-on testing.
[0004] In order to achieve the above-mentioned purpose, the utility model provides a mold for evaluating the insulation properties of polymers, comprising a first module, a second module, a conductive insert and an injection piece; the first module is arranged on one side of the second module, and the first module has a first molding groove on the side facing the second module, and the second module has a second molding groove on the side facing the first module, and the first molding groove and the second molding groove together enclose a cavity; the conductive insert is arranged in the cavity, and the conductive insert is a conductor, and the conductive insert includes a first conductive part, an extension part and a second conductive part connected in sequence, the outer surface of the first conductive part is in contact with the inner wall of the cavity, and a first gap is left between the outer surface of the extension part and the inner wall of the cavity, and the outer surface of the second conductive part is in contact with the inner wall of the cavity; the first module also has an injection hole, and the injection hole is connected to the first gap, and the injection piece is inserted into the injection hole for injecting a polymer solution into the injection hole.
[0005] Optionally, the extension portion extends along the height direction of the cavity, and one end of the extension portion in the height direction of the cavity is connected to the first conductive portion, and the other end is connected to the second conductive portion, the first conductive portion extends along the width direction of the cavity, and the second conductive portion extends along the length direction of the cavity, and the shape of the cavity is adapted to the shape of the conductive insert.
[0006] Optionally, a connection point between the extension portion and the first conductive portion and a connection point between the extension portion and the second conductive portion are both arc-shaped structures.
[0007] Optionally, the conductive insert further includes an anti-corrosion layer, and the outer surfaces of the first conductive portion, the extension portion, and the second conductive portion are all provided with the anti-corrosion layer.
[0008] Optionally, the thickness of the anti-corrosion layer is M, 1 μm≤M≤3 μm.
[0009] Optionally, the first conductive portion has a first conductive hole, and the second conductive portion has a second conductive hole, and the first conductive hole and the second conductive hole are used to connect to a power source so that the conductive insert is energized.
[0010] Optionally, one side surface of the outer surface of the first conductive part is a conductive surface, the first conductive hole is provided on the conductive surface, the conductive surface is attached to the inner wall of the cavity, and a second gap is left between the remaining side surfaces of the outer surface of the first conductive part and the inner wall of the cavity, the second gap is connected to the first gap, and the injection hole is connected to the second gap. As the polymer solution is injected, the polymer solution can pass through the injection hole, the second gap and the first gap in sequence.
[0011] Optionally, a column is provided in the second gap, and the column and the first conductive portion are spaced apart along the width direction of the cavity.
[0012] Optionally, a plurality of the conductive inserts are included, and the plurality of the conductive inserts are spaced apart along the width direction of the cavity. Among the plurality of the first gaps, any two adjacent first gaps are connected to each other, and the injection hole is connected to the first gap located in the middle.
[0013] Optionally, the distance from any side surface of the outer surface of the extension portion to the inner wall of the cavity is N, 1.5mm≤N≤2mm.
[0014] Compared with the prior art, the mold for evaluating the insulation properties of polymers in an embodiment of the present invention has the following beneficial effects: the present application sets a conductive insert in the cavity formed by the first molding groove and the second molding groove, so that the polymer can be directly molded on the outer surface of the extension portion of the conductive insert, thereby simulating the insulation layer condition of the polymer when it is molded in the product. Through the molding state of the polymer in the extension portion, it can be judged whether different polymers will have quality defects when molded in the product, and on this basis, subsequent power-on tests under different aging environments can be carried out, or the first conductive part and the polymer insulation layer can be connected to a power supply to perform a polar power-on test. The entire power-on test process, and since the conductive insert also has a first conductive part and a second conductive part, it is only necessary to connect the first conductive part and the second conductive part to a power supply to perform a power-on test, which is very convenient. In addition, the mold can be used multiple times, which can reduce the cost of multiple mold openings in the polymer evaluation stage. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 Schematic diagram of the structure of a mold for evaluating polymer insulation properties according to an embodiment of the present invention;
[0016] Figure 2 This is an exploded view of a mold for evaluating polymer insulation properties according to an embodiment of the present invention;
[0017] Figure 3 1 is a top view of a mold for evaluating polymer insulation properties according to an embodiment of the present invention;
[0018] Figure 4 This is an embodiment of the utility model Figure 3 Cross-sectional view in the AA direction;
[0019] Figure 5 This is an embodiment of the utility model Figure 4 Zoom in on the image at B;
[0020] Figure 6 It is a structural diagram of the first module of an embodiment of the utility model;
[0021] Figure 7 It is a structural diagram of the second module of an embodiment of the utility model;
[0022] Figure 8 This is a schematic structural diagram of a conductive insert according to an embodiment of the present utility model;
[0023] Figure 9 It is a schematic diagram of a polymer insulating layer formed on a conductive insert according to an embodiment of the present invention.
[0024] In the figure, 1. first module; 11. first molding groove; 111. separation groove; 12. injection hole; 2. second module; 21. second molding groove; 3. conductive insert; 31. first conductive part; 311. conductive surface; 3111. first conductive hole; 32. extension part; 33. second conductive part; 331. second conductive hole; 4. injection part; 5. cavity; 51. first gap; 52. second gap; 6. box; 7. joint; 8. column; 9. polymer insulation layer; 91. welding hole. DETAILED DESCRIPTION
[0025] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0026] In the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.
[0028] like Figures 1-8 As shown, a mold for evaluating the insulation properties of a polymer according to an embodiment of the present invention includes a first module 1, a second module 2, a conductive insert 3 and an injection piece 4; the first module 1 is arranged on one side of the second module 2, and the first module 1 has a first molding groove 11 on the side facing the second module 2, and the second module 2 has a second molding groove 21 on the side facing the first module 1, and the first molding groove 11 and the second molding groove 21 together enclose a cavity 5; the conductive insert 3 is arranged in the cavity 5, and the conductive insert 3 is a conductor. The conductive insert 3 includes a first conductive part 31, an extension part 32 and a second conductive part 33 connected in sequence, the outer surface of the first conductive part 31 is in contact with the inner wall of the cavity 5, a first gap 51 is left between the outer surface of the extension part 32 and the inner wall of the cavity 5, and the outer surface of the second conductive part 33 is in contact with the inner wall of the cavity 5; the first module 1 also has an injection hole 12, and the injection hole 12 is connected to the first gap 51, and the injection piece 4 is inserted into the injection hole 12 for injecting a polymer solution into the injection hole 12.
[0029] Based on the above scheme, the present application sets a conductive insert 3 in the cavity 5 formed by the first molding groove 11 and the second molding groove 21, so that the polymer can be directly molded on the outer surface of the extension portion 32 of the conductive insert 3, thereby simulating the insulation layer condition when the polymer is molded in the product. By the molding state of the polymer in the extension portion 32, it can be judged whether different polymers will have quality defects when molded in the product, and subsequent insulation evaluation is carried out on this basis. Moreover, since the conductive insert 3 also has a first conductive portion 31 and a second conductive portion 33, it is only necessary to connect the first conductive portion 31 and the second conductive portion 33 to a power supply to perform power-on tests under different aging environments, or to connect the first conductive portion 31 and the polymer insulation layer 9 to a power supply to perform polar power-on tests. The entire power-on test process is very convenient. In addition, the mold can be used multiple times, which can reduce the cost of multiple mold openings in the polymer evaluation stage.
[0030] In some embodiments, the conductive insert 3 is made of metal material and can be selected according to the material of the product. For example, when the polymer insulation layer 9 is formed on the copper busbar, the conductive insert 3 can be made of brass.
[0031] In some embodiments, in order to protect the first module 1 and the second module 2 , a box body 6 is further included, and the first module 1 and the second module 2 are arranged inside the box body 6 .
[0032] like Figure 8 As shown, in order to improve the simulation effect during polymer molding, the extension portion 32 extends along the height direction of the cavity 5, and one end of the extension portion 32 in the height direction of the cavity 5 is connected to the first conductive portion 31, and the other end is connected to the second conductive portion 33. The first conductive portion 31 extends along the width direction of the cavity 5, and the second conductive portion 33 extends along the length direction of the cavity 5. The shape of the cavity 5 is adapted to the shape of the conductive insert 3. By setting the extension portion 32 to extend along the height direction of the cavity 5, the molding of the polymer at the vertical extension portion 32 of the conductive insert 3 is simulated.
[0033] like Figure 8 As shown, in order to improve the simulation effect of polymer molding, the connection between the extension part 32 and the first conductive part 31 and the connection between the extension part 32 and the second conductive part 33 are both arc-shaped structures to simulate the situation where the polymer is molded in an arc-shaped structure.
[0034] In some embodiments, the connection between the extension portion 32 and the first conductive portion 31 and the connection between the extension portion 32 and the second conductive portion 33 may also be set to other irregular shapes.
[0035] Optionally, in order to prevent the conductive insert 3 from being electrochemically corroded during subsequent power-on testing, the conductive insert 3 further includes an anti-corrosion layer, and the outer surfaces of the first conductive portion 31 , the extension portion 32 and the second conductive portion 33 are all provided with the anti-corrosion layer.
[0036] In some embodiments, the anti-corrosion layer is a nickel material layer formed by electroplating nickel on the outer surface of the conductive insert 3 .
[0037] Optionally, in order to ensure the anti-corrosion effect, the thickness of the anti-corrosion layer is M, 1μm≤M≤3μm.
[0038] like Figure 8 As shown, in order to facilitate subsequent power-on testing, the first conductive portion 31 has a first conductive hole 3111 and the second conductive portion 33 has a second conductive hole 331 . The first conductive hole 3111 and the second conductive hole 331 are used to connect to a power source to enable the conductive insert 3 to be energized.
[0039] like Figure 5 and Figure 8 As shown, in order to facilitate the subsequent power-on test, one side surface of the outer surface of the first conductive part 31 is a conductive surface 311, and the first conductive hole 3111 is provided on the conductive surface 311. The conductive surface 311 is attached to the inner wall of the cavity 5, and a second gap 52 is left between the remaining side surfaces of the outer surface of the first conductive part 31 and the inner wall of the cavity 5. The second gap 52 is connected to the first gap 51, and the injection hole 12 is connected to the second gap 52. As the polymer solution is injected, the polymer solution can pass through the injection hole 12, the second gap 52 and the first gap 51 in sequence, and then form a polymer insulating layer 9 on the other sides of the first conductive part 31 except the conductive surface 311. When performing the subsequent polymer insulation evaluation, the polymer insulating layer 9 can be formed on the other sides of the first conductive part 31 except the conductive surface 311 to avoid the first conductive part 31 from contacting other conductive structures, thereby avoiding affecting the accuracy of the power-on test.
[0040] like Figure 9 As shown, in some embodiments, a connector 7 for connecting to a power source is further provided in the first conductive hole 3111, and one end of the connector 7 is received in the conductive surface 311, and the other end protrudes from the first conductive hole 3111 and extends into the second gap 52. As the polymer solution is injected, the polymer solution can surround the other end of the connector 7 and form a polymer insulating layer 9 at the other end of the connector 7 to prevent leakage in subsequent power-on tests, and can also serve to fix the connector 7.
[0041] like Figure 7-Figure 9As shown, in order to facilitate the subsequent high and low temperature impact test to solve the problem of cracking of the polymer injection molding weld line, a column 8 is provided in the second gap 52, and the column 8 and the first conductive part 31 are spaced apart along the width direction of the cavity 5, so that the polymer solution will form a welding hole 91 around the outer peripheral side of the column 8, and the welding hole 91 is used to judge whether a welding line appears in the polymer insulating layer 9.
[0042] like Figure 2 、 Figure 6 and Figure 7 As shown, in order to improve the accuracy of polymer evaluation, a plurality of conductive inserts 3 are included, and the plurality of conductive inserts 3 are spaced apart along the width direction of the cavity 5, and among the plurality of first gaps 51, any two adjacent first gaps 51 are connected to each other, and the injection hole 12 is connected to the first gap 51 located in the middle. By arranging a plurality of conductive inserts 3, the molding conditions of the polymer insulating layer 9 on the outer surfaces of the plurality of extensions 32 can be observed at the same time to ensure the accuracy of the evaluation.
[0043] like Figure 6 and Figure 9 As shown, the first module 1 is arranged on the top surface of the second module 2, and the top wall of the first molding groove 11 also has a separation groove 111. The separation groove 111 is arranged between any two adjacent first conductive parts 31, and the separation groove 111 is connected to the second gap 52. As the polymer solution is injected, the polymer solution can flow through the separation groove to form a polymer insulation layer 9 protruding from the conductive surface 311 between the two adjacent first conductive parts 31, thereby ensuring that the two adjacent first conductive parts 31 are separated in the subsequent polymer insulation evaluation.
[0044] Optionally, in order to facilitate the subsequent polymer insulation evaluation, the distance from any side surface of the outer surface of the extension portion 32 to the inner wall of the cavity 5 is N, 1.5mm≤N≤2mm. The thin-walled polymer insulation layer 9 formed in this way will be subjected to more stringent test conditions in the subsequent polymer insulation evaluation, thereby ensuring the accuracy of the subsequent insulation evaluation.
[0045] The polymer insulating layer 9 obtained by injection molding on the conductive insert 3 of the present application is as follows Figure 9 As shown, the subsequent power-on test includes the following steps:
[0046] 1. First, observe the injection molding quality of the polymer insulating layer 9;
[0047] 2. After the injection molding quality is confirmed to be OK, polar power-on test, inter-polar power-on test and material aging power-on test are carried out respectively;
[0048] Polar power-on test: connect one pole of the power supply to the first conductive part 31 and the other pole to the polymer insulation layer 9 to detect the insulation resistance of the polymer insulation layer 9 and the threshold value of the current breakdown;
[0049] Inter-electrode power-on test: connect one pole of the power supply to the first conductive portion 31 of one of the conductive inserts 3, and the other pole to the first conductive portion 31 of the other conductive insert 3;
[0050] Material aging power-on test: connect one pole of the power supply to the first conductive part 31 and the other pole to the second conductive part 33. The power supply simulates the current during actual operation, and the conductive insert 3 and the polymer insulation layer 9 are placed in different aging environments for testing.
[0051] In summary, an embodiment of the present invention provides a mold for evaluating the insulation properties of polymers, which arranges a conductive insert 3 in the cavity 5 formed by the first molding groove 11 and the second molding groove 11, so that the polymer can be directly molded on the outer surface of the extension portion 32 of the conductive insert 3, thereby simulating the insulation layer condition when the polymer is molded in the product. By the molding state of the polymer in the extension portion 32, it can be judged whether different polymers will have quality defects when molded in the product, and subsequent power-on tests can be performed on this basis. Moreover, since the conductive insert 3 also has a first conductive portion 31 and a second conductive portion 33, it is only necessary to connect the first conductive portion 31 and the second conductive portion 33 to a power supply to perform power-on tests under different aging environments, or to connect the first conductive portion 31 and the polymer insulation layer 9 to a power supply to perform polar power-on tests. The entire power-on test process is very convenient. In addition, the mold can be used multiple times, which can reduce the cost of multiple mold openings in the polymer evaluation stage.
[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.
Claims
1. A mold for evaluating the insulation properties of a polymer, characterized in that: comprising a first module, a second module, a conductive insert and an injection part; The first module is provided on one side of the second module, and the first module has a first molding groove on the side facing the second module, and the second module has a second molding groove on the side facing the first module, and the first molding groove and the second molding groove together enclose a mold cavity; The conductive insert is disposed in the mold cavity. The conductive insert is a conductor and includes a first conductive portion, an extension portion, and a second conductive portion connected in sequence. The outer surface of the first conductive portion is in contact with the inner wall of the mold cavity. A first gap is left between the outer surface of the extension portion and the inner wall of the mold cavity. The outer surface of the second conductive portion is in contact with the inner wall of the mold cavity. The first module further has an injection hole, and the injection hole is communicated with the first gap. The injection piece is inserted into the injection hole and is used to inject the polymer solution into the injection hole.
2. The mold for evaluating polymer insulation properties according to claim 1, wherein: The extension portion extends along the height direction of the cavity, and one end of the extension portion in the height direction of the cavity is connected to the first conductive portion, and the other end is connected to the second conductive portion. The first conductive portion extends along the width direction of the cavity, and the second conductive portion extends along the length direction of the cavity. The shape of the cavity is adapted to the shape of the conductive insert.
3. The mold for evaluating polymer insulation properties according to claim 1, wherein: A connection point between the extension portion and the first conductive portion and a connection point between the extension portion and the second conductive portion are both arc-shaped structures.
4. The mold for evaluating polymer insulation properties according to claim 1, wherein: The conductive insert further includes an anti-corrosion layer, and outer surfaces of the first conductive portion, the extension portion, and the second conductive portion are all provided with the anti-corrosion layer.
5. The mold for evaluating polymer insulation properties according to claim 4, wherein: The thickness of the anti-corrosion layer is M, 1 μm≤M≤3 μm.
6. The mold for evaluating polymer insulation properties according to claim 1, wherein: The first conductive portion has a first conductive hole, and the second conductive portion has a second conductive hole. The first conductive hole and the second conductive hole are used to connect to a power source so that the conductive insert is energized.
7. The mold for evaluating polymer insulation properties according to claim 6, wherein: One side surface of the outer surface of the first conductive part is a conductive surface, the first conductive hole is provided on the conductive surface, the conductive surface is attached to the inner wall of the cavity, and a second gap is left between the remaining side surfaces of the outer surface of the first conductive part and the inner wall of the cavity, the second gap is connected to the first gap, and the injection hole is connected to the second gap. As the polymer solution is injected, the polymer solution can pass through the injection hole, the second gap and the first gap in sequence.
8. The mold for evaluating polymer insulation properties according to claim 7, wherein: A column is provided in the second gap, and the column and the first conductive portion are spaced apart from each other along the width direction of the cavity.
9. The mold for evaluating polymer insulation properties according to claim 1, wherein It comprises a plurality of conductive inserts, which are spaced apart along the width direction of the cavity, and any two adjacent first gaps among the plurality of first gaps are connected to each other, and the injection hole is connected to the first gap located in the middle.
10. The mold for evaluating polymer insulation properties according to claim 1, wherein The distance from any side surface of the outer surface of the extension portion to the inner wall of the cavity is N, 1.5mm≤N≤2mm.