Insulating paint dielectric loss sample preparation and testing device
By coating and baking the insulating paint film on the copper foil, the dielectric loss test is directly carried out, which solves the problem of high cost of sample preparation of enameled wire and achieves low-cost and efficient dielectric loss test.
Patent Information
- Application Number
- CN202421443285.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-06-24
AI Technical Summary
In the prior art, when testing the dielectric loss of enameled wire, the cost of making enameled wire sample is high, and there are problems of copper wire and electricity waste during the coating process.
A dielectric loss sample preparation and testing device for insulating coatings was designed. By coating the insulating paint film on the copper foil and baking and curing, it was directly connected to the test instrument for dielectric loss testing, avoiding the production process of enameled wire.
It reduces testing costs, shortens time, and can test multiple samples at the same time, improving the efficiency of testing and the investment efficiency of the equipment.
Smart Images
Figure CN223078399U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of testing devices, in particular to a sample preparation and testing device for dielectric loss of insulating coatings. Background Technique
[0002] When testing the dielectric loss of insulating paint, the common method is to first make enameled wire from the insulating paint through an enameling machine under certain process conditions (such as baking temperature, film thickness, number of film coatings, baking speed, etc.). Then, a section of about 10 cm long enameled wire is intercepted, and the enamel film about 1 cm at one end is removed to expose the copper wire. Then, the copper wire is used as the conductive end to connect to the positive electrode of the testing instrument, and the surface of the copper wire coated with the insulating enamel film is used as the insulating surface to connect to the negative electrode of the testing instrument. The dielectric loss at different temperatures can be tested through the heating control system and software analysis of the dielectric loss instrument.
[0003] The common method for making enameled wire samples is as follows: copper wire with a diameter of φ0.4 mm, drying oven length: 3.8 m, drying oven temperature: 450 - 480 °C (inlet - outlet), enameled wire baking speed: 85 m / min, die coating: 7 times. That is, the 0.4 mm copper wire is coated with paint using a die and then passes through the drying oven at a speed of 85 m / min for baking. After drying, it is coated with paint again and baked, and this cycle is repeated 7 times, and it is automatically collected on a plastic shaft.
[0004] The disadvantages of making the above enameled wire are as follows:
[0005] 1. The cost of the enameling machine is relatively high, and insulating paint manufacturers may not have an enameling machine; if they entrust downstream enamelled wire manufacturers to conduct tests on their behalf, the cycle will be relatively long.
[0006] 2. Even if an insulating paint manufacturer spends 500,000 - 1,000,000 yuan to purchase an enameling machine, a large amount of waste of copper wire, electricity, etc. will be caused during the process of coating enameled wire. After testing, the enameled wire can only be treated as waste. Content of the Utility Model
[0007] Therefore, the technical problem to be solved by the present utility model is to overcome the problem that when testing the dielectric loss of enameled wire in the prior art, due to the high production cost of enameled wire samples, a high cost is required.
[0008] To solve the above technical problem, the present utility model provides a sample preparation and testing device for dielectric loss of insulating coatings, including: a support base, which is an insulating member; a plurality of positive electrodes, which are arranged on the support base and are insulated from the support base; a plurality of negative electrodes, which are arranged on the support base, and the plurality of negative electrodes and the plurality of positive electrodes are arranged in one-to-one correspondence; a test sample, which includes an insulating enamel film and a copper foil. The insulating enamel film is coated on one end face of the copper foil, and the other end face of the copper foil is used as the conductive end to be electrically connected to the positive electrode, and the end face of the insulating enamel film away from the copper foil is used as the insulating surface to be electrically connected to the negative electrode.
[0009] In an embodiment of the present utility model, the testing device further includes a metal pressing block, the metal pressing block is in contact with the insulating paint film, the negative electrode is connected to the insulating paint film through the metal pressing block, and the cross-sectional area of the metal pressing block is smaller than that of the copper foil. By providing the metal pressing block, the contact area between the negative electrode and the insulating paint film is increased, which is beneficial to conduction; at the same time, the metal pressing block can also press the copper foil to make the copper foil in good contact with the positive electrode.
[0010] In an embodiment of the present utility model, the supporting base includes a bottom plate and at least one U-shaped bracket, and both ends of the U-shaped bracket are fixedly connected to the bottom plate.
[0011] In an embodiment of the present utility model, a plurality of mounting grooves are provided on the bottom plate, the plurality of positive electrodes are arranged in one-to-one correspondence with the plurality of mounting grooves, and the positive electrodes are arranged in the mounting grooves.
[0012] In an embodiment of the present utility model, a plurality of through holes I are provided on the cross beam of the U-shaped bracket, the through holes I are located directly above the mounting grooves, the negative electrode passes through the through holes I, and the through holes I are used for positioning and guiding the negative electrode.
[0013] In an embodiment of the present utility model, the copper foil is a circular sheet with a diameter of 1 cm.
[0014] In an embodiment of the present utility model, the thickness of the copper foil is 0.4 mm.
[0015] In an embodiment of the present utility model, the insulating paint film is coated on the copper foil through a coater.
[0016] In an embodiment of the present utility model, the insulating paint film is cured on the circular surface at one end of the copper foil after being baked in an oven.
[0017] In an embodiment of the present utility model, a separation gap is provided between the metal pressing block and the copper foil.
[0018] The above technical solutions of the present utility model have the following beneficial effects compared with the prior art:
[0019] The insulating paint medium loss sample preparation and testing device of the present utility model does not need to be made into enameled wire for testing, which saves costs and shortens time; multiple samples can be tested simultaneously, and there are very obvious improvements in terms of equipment investment, testing convenience, testing efficiency, etc. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to make the content of the present utility model easier to be clearly understood, the following further describes the present utility model in detail according to the specific embodiments of the present utility model and in conjunction with the accompanying drawings, wherein
[0021] Figure 1 This is a schematic structural diagram of a device for preparing and testing the dielectric loss of an insulating coating in a preferred embodiment of the present utility model;
[0022] Figure 2 This is a schematic structural diagram of a test sample in a preferred embodiment of the present utility model.
[0023] Explanation of the reference numerals in the specification drawings: support base 1, bottom plate 11, installation groove 111, U-shaped bracket 12, through hole 121, positive electrode 2, negative electrode 3, test sample 4, insulating paint film 41, copper foil 42, metal pressing block 5. Specific implementation manners
[0024] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the exemplified embodiments are not intended to limit the present utility model.
[0025] Referring to Figure 1 、 2 As shown, the device for preparing and testing the dielectric loss of an insulating coating of the present utility model includes: a support base 1, a plurality of positive electrodes 2, a plurality of negative electrodes 3, and a test sample 4; the support base 1 is an insulating member; a plurality of positive electrodes 2 are arranged on the support base 1, and the positive electrodes 2 are insulated from the support base 1; a plurality of negative electrodes 3 are arranged on the support base 1, and the plurality of negative electrodes 3 are arranged in one-to-one correspondence with the plurality of positive electrodes 2; the test sample 4 includes an insulating paint film 41 and a copper foil 42, the insulating paint film 41 is coated on one end face of the copper foil 42, the other end face of the copper foil 42 serves as a conductive end and is electrically connected to the positive electrode 2, and the end face of the insulating paint film 41 away from the copper foil 42 serves as an insulating surface and is electrically connected to the negative electrode 3.
[0026] In the above structure, the test device further includes a metal pressing block 5, the metal pressing block 5 is in contact with the insulating paint film 41, the negative electrode 3 is connected to the insulating paint film 41 through the metal pressing block 5, and the cross-sectional area of the metal pressing block 5 is smaller than the cross-sectional area of the copper foil 42. A separation gap is provided between the metal pressing block 5 and the copper foil 42. The test sample 4 is arranged between the metal pressing block 5 and the positive electrode 2, the lower surface of the copper foil 42 is connected to the positive electrode 2, the insulating paint film 41 is coated on the upper surface of the copper foil 42, and the insulating paint film 41 is connected to the upper metal pressing block 5, so that the entire insulating paint film 41 is connected to the negative electrode 3 through the metal pressing block 5. If there is no metal pressing block 5 and only a probe-like object is used to press on the surface of the insulating paint film 41 to connect to the negative electrode 3, the contact area is too small.
[0027] In the above structure, the support base 1 includes a bottom plate 11 and at least one U-shaped bracket 12. The two ends of the U-shaped bracket 12 are fixedly connected to the bottom plate 11. A plurality of mounting grooves 111 are provided on the bottom plate 11. The plurality of positive electrodes 2 are arranged in one-to-one correspondence with the plurality of mounting grooves 111, and the positive electrodes 2 are arranged in the mounting grooves 111. A plurality of through holes 121 are provided on the cross beam of the U-shaped bracket 12. The through holes 121 are located directly above the mounting grooves 111. The negative electrode 3 penetrates through the through holes 121, and the through holes 121 are used for positioning and guiding the negative electrode 3.
[0028] In the above structure, the copper foil 42 is made of copper, and the copper foil 42 is a circular sheet with a diameter of 1 cm. The thickness of the copper foil 42 is 0.4 mm. The insulating paint film 41 is coated onto the copper foil 42 by a coater. The insulating paint film 41 is cured on the circular surface at one end of the copper foil 42 after being baked in an oven.
[0029] The method for preparing the sample of the above copper foil 42:
[0030] First, apply an appropriate amount of insulating paint on the surface of a copper foil with a thickness of 0.4 mm, scrape it flat with a coater, then bake it at 200 °C for 5 minutes, repeat this 7 times, and then cut a copper foil with a diameter of φ1 cm.
[0031] The principle of the insulating paint dielectric loss sample preparation and testing device of the present utility model is as follows:
[0032] Directly apply the insulating paint on the copper foil 42 through a coater, then bake it for a fixed time at a certain temperature in an oven to cure the paint film on the surface of the copper foil 42, forming the insulating paint film 41. After cooling to room temperature, make the copper foil 42 into a copper foil with a diameter of 1 cm. During testing, use the lower surface of the copper foil 42 as the conductive end to connect to the positive electrode 2 of the testing instrument, and the upper surface coated with the insulating paint film 41 as the insulating surface to connect to the negative electrode 3 of the testing instrument. The dielectric loss at different temperatures can be tested through the heating control system and software analysis of the dielectric loss meter. During testing, there is a voltage between the positive and negative electrodes. During the process of heating from room temperature to 300 degrees, there will be a leakage current in the insulating paint film 41, and the leakage current is different at different temperatures, which is the dielectric loss.
[0033] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.
Claims
1. An insulating paint dielectric loss sample preparation and testing device, characterized in that: Comprising, A support base, which is an insulating member; A plurality of positive electrodes, which are arranged on the support base and are insulated from the support base; A plurality of negative electrodes, which are arranged on the support base, and the plurality of negative electrodes and the plurality of positive electrodes are arranged in one-to-one correspondence; A test sample, which includes an insulating paint film and a copper foil sheet. The insulating paint film is coated on one end face of the copper foil sheet. The other end face of the copper foil sheet serves as a conductive end and is electrically connected to the positive electrode. The end face of the insulating paint film away from the copper foil sheet serves as an insulating face and is electrically connected to the negative electrode.
2. The insulation coating dielectric loss sample preparation and testing device according to claim 1, characterized in that: The test device further includes a metal pressing block. The metal pressing block is in contact with the insulating paint film. The negative electrode is connected to the insulating paint film through the metal pressing block. The cross-sectional area of the metal pressing block is smaller than the cross-sectional area of the copper foil sheet.
3. The insulating paint dielectric loss sample preparation and testing device according to claim 1, characterized in that: The support base includes a bottom plate and at least one U-shaped bracket. Both ends of the U-shaped bracket are fixedly connected to the bottom plate.
4. The insulating coating medium loss sample preparation and testing device according to claim 3, characterized in that: A plurality of mounting grooves are provided on the bottom plate. The plurality of positive electrodes and the plurality of mounting grooves are arranged in one-to-one correspondence, and the positive electrodes are arranged in the mounting grooves.
5. The insulating paint dielectric loss sample preparation and testing device according to claim 4, characterized in that: A plurality of through holes 1 are provided on the cross beam of the U-shaped bracket. The through holes 1 are located directly above the mounting grooves. The negative electrode passes through the through holes 1, and the through holes 1 are used for positioning and guiding the negative electrode.
6. The insulating paint dielectric loss sample preparation and testing device according to claim 1, characterized in that: The copper foil sheet is a circular sheet with a diameter of 1 cm.
7. The insulating paint dielectric loss sample preparation and testing device according to claim 6, characterized in that: The thickness of the copper foil sheet is 0.4 mm.
8. The insulating paint dielectric loss sample preparation and testing device according to claim 4, characterized in that: The insulating paint film is coated onto the copper foil sheet through a coater.
9. The insulating paint dielectric loss sample preparation and testing device according to claim 8, characterized in that: The insulating paint film is cured on the circular surface at one end of the copper foil sheet after being baked in an oven.
10. The insulating paint dielectric loss sample preparation and testing device according to claim 2, characterized in that: A separation gap is provided between the metal pressing block and the copper foil sheet.