Liquid dielectric strength testing device and testing method

Abstract

The invention belongs to the technical field of liquid dielectric strength testing, and discloses a liquid dielectric strength testing device and a testing method. The liquid dielectric strength testing device comprises a box body, two electrode assemblies, a liquid injection piece and a dielectric strength tester, wherein two penetrating holes are oppositely formed in the box body; the two electrode assemblies are oppositely arranged and penetrate through the two penetrating holes respectively; the electrode assembly comprises an electrode stem, an electrode tip and a nut, the electrode stem is a screw, and the electrode tip is in threaded connection with the inner end of the electrode stem; the two ends of each penetrating hole are respectively provided with two nuts, and the two nuts are in threaded connection with the corresponding electrode rods. The liquid injection part is used for injecting liquid into the box body or injecting the liquid to the outer surfaces, close to each other, of the two electrode tips, so that a gap between the two electrode tips is filled with the liquid; and two test ends of the dielectric strength tester are respectively connected with the outer ends of the two electrode rods in a one-to-one correspondence manner. According to the liquid dielectric strength testing device, the testing electrode can be conveniently disassembled and replaced, and the application range is wide.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid dielectric strength testing, and in particular to a liquid dielectric strength testing device and a testing method. Background Art

[0002] Liquid materials such as insulating grease, thermal paste, and electrical insulating glue are usually made of base resins and various powder fillers. They are used in various electronic devices and are key components for protecting electronic devices. High-end devices have even more stringent requirements on the electrical properties of materials. Therefore, it is necessary to conduct dielectric strength tests on these liquid materials.

[0003] At present, the test of liquid materials is generally carried out by using an oil cup, and two test electrodes are fixed on the inner wall of the oil cup. By pouring insulating oil into the oil cup, the dielectric strength test of the insulating oil is carried out. However, since the two test electrodes are fixed in the oil cup, it is inconvenient to disassemble and replace the test electrodes. In addition, the oil cup structure can only test liquid insulating oil with good fluidity, and can only perform one experiment, resulting in a great waste of the test device. In addition, the prior art does not involve the dielectric strength test of viscous liquid materials such as pastes with poor fluidity.

[0004] Therefore, there is an urgent need for a liquid dielectric strength testing device to solve the above technical problems. Summary of the invention

[0005] The object of the present invention is to provide a liquid dielectric strength testing device and a testing method. The liquid dielectric strength testing device is convenient for disassembly and replacement of test electrodes and has a wide range of applications. It can test both liquid materials with good fluidity and viscous liquid materials such as pastes with poor fluidity.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In one aspect, a liquid dielectric strength testing device is provided, comprising:

[0008] A box body, wherein the box body is provided with two penetration holes opposite to each other;

[0009] Two electrode assemblies, the two electrode assemblies are arranged opposite to each other and are respectively provided with two through holes; the electrode assembly comprises an electrode rod, an electrode head and a nut, the electrode rod is a screw rod, and the electrode head is threadedly connected to the inner end of the electrode rod; two nuts are respectively provided at both ends of each through hole, and the two nuts are threadedly connected to the corresponding electrode rod, so as to fix the electrode rod to the box body;

[0010] A liquid injection member, used to inject liquid into the box body or inject liquid into the outer surfaces of the two electrode heads close to each other, so that the liquid fills the gap between the two electrode heads;

[0011] The dielectric strength tester is located outside the box body, and the two test ends of the dielectric strength tester are respectively connected to the outer ends of the two electrode rods in a one-to-one correspondence, so as to apply an electric field to the liquid.

[0012] In some possible embodiments, the liquid dielectric strength testing device further includes a plurality of positioning members of different thicknesses, wherein the positioning members can be selectively disposed between the two electrode heads, and the two ends of the positioning members are respectively attached to the two electrode heads to limit the electrode distance between the two electrode heads.

[0013] In some possible implementations, the nut is a flange nut, which includes a nut portion and a flange portion fixed to one side of the nut portion, and an outer diameter of the flange portion is greater than a diameter of the through hole.

[0014] In some possible implementations, the box body includes a box body and a box cover, the box cover is openably and closably disposed on the box body, and the box body is provided with two oppositely disposed through holes.

[0015] In some possible implementations, the box body includes a bottom plate and four side plates surrounding the bottom plate, the four side plates are all bonded to the bottom plate, and two adjacent side plates are bonded end to end.

[0016] In some possible implementations, the thickness of the bottom plate and the side plate is greater than or equal to 3 mm.

[0017] In some possible implementations, the box body is made of high dielectric strength plastic or high dielectric strength plastic composite material; and / or,

[0018] The electrode rod and the electrode head are made of the same material, and are both made of stainless steel or pure copper; and / or,

[0019] The nut is made of high dielectric strength plastic or high dielectric strength plastic composite material.

[0020] In some possible implementations, the outer end of the electrode rod is provided with a cross-shaped or straight-shaped screw head; and / or,

[0021] The electrode head is a hemispherical structure, a flat plate structure or a spherical structure.

[0022] On the one hand, a method for testing the dielectric strength of a liquid is provided, using the liquid dielectric strength testing device as described in any of the above schemes, comprising:

[0023] S1. According to the insulation properties of the liquid material, loosen the nut and adjust the positions of the two electrode rods so that the electrode distance between the two electrode heads reaches the set distance. After adjustment, tighten the nut to fix the electrode rod to the box body;

[0024] S2. According to the flow properties of the liquid material, the liquid is poured into the box body through the liquid injection piece or the liquid is injected into the outer surfaces of the two electrode heads close to each other, so that the liquid fills the gap between the two electrode heads;

[0025] S3, connecting the two test ends of the dielectric strength tester to the outer ends of the two electrode rods one by one, and after the corresponding connection, starting the dielectric strength tester to apply an electric field to the liquid.

[0026] In some possible implementations, step S1 is specifically as follows: among a plurality of position locators with different thicknesses, a position locator whose thickness matches the insulating properties of the liquid material to be tested is selected, the position locator is placed between the two electrode heads, the nut is loosened and the positions of the two electrode rods are adjusted so that the two electrode heads are both in contact with the position locator, after adjustment, the position locator is taken out, and the nut is tightened to fix the electrode rod to the box body.

[0027] Beneficial effects of the present invention:

[0028] The liquid dielectric strength testing device provided by the present invention comprises a box body, two electrode assemblies, a liquid injection piece and a dielectric strength tester. For liquid materials with good fluidity, liquid is poured into the box body through the liquid injection piece, so that the liquid flows into the box body and the liquid level exceeds the two electrode heads, so that the liquid can fill the gap between the two electrode heads for testing. For viscous liquid materials such as pastes with poor fluidity, liquid is injected into the outer surfaces of the two electrode heads close to each other through the liquid injection piece, so that the liquid can fill the gap between the two electrode heads for testing, so that the liquid dielectric strength testing device has a wide range of applications. The electrode rod of the present invention is a screw rod, and the electrode head is threadedly connected to the inner end of the electrode rod. The electrode heads of different types or sizes can be replaced to change the electrode distance, and the electrode distance can also be changed by adjusting the positions of the two electrode rods to meet the testing requirements for liquid materials with different insulation properties. In addition, the electrode head is threadedly connected to the inner end of the electrode rod, which is convenient for disassembly and replacement of the electrode head and is firmly installed. The electrode rod is fixed to the box body by two nuts, which makes it easy to disassemble and replace the electrode rod and is firmly installed. In addition, when the position of the electrode rod relative to the shell is adjusted, the two nuts will not fall off the electrode rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is a structural schematic diagram of the liquid dielectric strength testing device provided by the present invention.

[0030] In the figure:

[0031] 1. Box body;

[0032] 2. Electrode assembly; 21. Electrode rod; 22. Electrode head; 23. Nut. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] like Figure 1As shown, the present invention provides a liquid dielectric strength test device, including a box body 1, two electrode assemblies 2, a liquid injection piece and a dielectric strength tester, wherein the box body 1 is relatively provided with two through holes; the two electrode assemblies 2 are relatively arranged, and are respectively provided with two through holes; the electrode assembly 2 includes an electrode rod 21, an electrode head 22 and a nut 23, the electrode rod 21 is a screw, and the electrode head 22 is threadedly connected to the inner end of the electrode rod 21. Specifically, the diameter of the screw is the same as the diameter of the through hole, which is convenient for limiting the screw, and the diameter specification of the screw is M3, M4, M5 or M6. The electrode head 22 is a hemispherical structure, a flat structure or a spherical structure, which is convenient for processing. Of course, the electrode head 22 can also be other regular or irregular structures. Two nuts 23 are provided at both ends of each through hole, and the two nuts 23 are threadedly connected to the corresponding electrode rods 21, and are used to fix the electrode rods 21 to the box body 1; the liquid injection piece is used to inject liquid into the box body 1 or inject liquid into the outer surfaces of the two electrode heads 22 close to each other, so that the liquid fills the gap between the two electrode heads 22; illustratively, the liquid injection piece is a barrel, which is used to inject liquid materials with good fluidity into the box body 1. Alternatively, the liquid injection piece is a syringe, and viscous liquids such as pastes with poor fluidity are sucked into the syringe, and then injected into the outer surfaces of the two electrode heads 22 close to each other. The dielectric strength tester is located outside the box body 1, and the two test ends of the dielectric strength tester are respectively connected to the outer ends of the two electrode rods 21 one by one, and are used to apply an electric field to the liquid.

[0038] For liquid materials with good fluidity, liquid is poured into the box body 1 through the liquid injection piece, so that the liquid flows into the box body 1 and the liquid level exceeds the two electrode heads 22, so that the liquid can fill the gap between the two electrode heads 22 for testing. For viscous liquid materials such as pastes with poor fluidity, liquid is injected into the outer surfaces of the two electrode heads 22 close to each other through the liquid injection piece, so that the liquid can fill the gap between the two electrode heads 22 for testing. Therefore, the liquid dielectric strength test device can test both liquid materials with good fluidity and viscous liquid materials such as pastes with poor fluidity, and has a wide range of applications.

[0039] Whether the fluidity of the liquid material is good or poor, it has its own insulation performance. When the same dielectric strength tester is used to test liquid materials with different insulation properties, in order to meet the test requirements, it may be necessary to change the electrode distance between the two test electrodes. The electrode rod 21 of the present invention is a screw, and the electrode head 22 is threadedly connected to the inner end of the electrode rod 21. The electrode head 22 of different types or sizes can be replaced to change the electrode distance, and the electrode distance can also be changed by adjusting the positions of the two electrode rods 21 to meet the test requirements of fluid liquid materials with different insulation properties. In addition, the electrode head 22 is threadedly connected to the inner end of the electrode rod 21, which is convenient for disassembly and replacement of the electrode head 22, and is firmly installed. An electrode rod 21 is fixed to the box body 1 by two nuts 23, which is convenient for disassembly and replacement of the electrode rod 21, and is firmly installed. In addition, when adjusting the position of the electrode rod 21 relative to the shell, the two nuts 23 will not fall from the electrode rod 21. In addition, using a smaller box body 1, a small amount of liquid materials with good fluidity or viscous liquid materials such as pastes with poor fluidity can be tested for dielectric strength, and the structure is simple.

[0040] Optionally, in this embodiment, the liquid dielectric strength test device further includes a plurality of position locators of different thicknesses, which can be selectively arranged between the two electrode heads 22, and the two ends of the position locator are respectively fitted with the two electrode heads 22 to define the electrode distance between the two electrode heads 22. Exemplarily, the position locator is a positioning sheet. According to the different insulation properties of different liquid materials, position locators of corresponding thickness are selected to define the electrode distance between the two electrode heads 22 to meet the requirements for the electrode distance during liquid material testing.

[0041] Optionally, in this embodiment, the nut 23 is a flange nut, which includes a nut portion and a flange portion fixed to one side of the nut portion, and the outer diameter of the flange portion is larger than the diameter of the through hole. In this way, the flange nut seals the opening of the through hole to prevent liquid from flowing out of the through hole.

[0042] Optionally, in the present embodiment, the box body 1 includes a box body and a box cover, the box cover can be opened and closed on the box body, and the box body has two holes arranged opposite to each other. With such arrangement, when liquid is added to the box body 1, the box cover is opened to facilitate the addition of liquid. During the test, the box cover is closed, which can effectively shield the dangerous situation of current flashover during the test and protect the tester to a great extent. In addition, the inner cavity of the box body 1 is made into a closed inner cavity. After the box body 1 is sealed, the liquid can be shaken to a large extent, and a multi-point measurement of a liquid material can be achieved without re-adding liquid material, and the operation is efficient and convenient. Exemplarily, the box cover is detachably mounted outside the box body, or the box cover is hinged to the box body.

[0043] Optionally, in this embodiment, the box body includes a bottom plate and four side plates surrounding the bottom plate, the four side plates are all bonded to the bottom plate, and two adjacent side plates are bonded end to end. Specifically, the bottom plate and the four side plates are all square plates, and the through hole is set at the center of the side plate. During installation, the box body can be made by simply bonding the bottom plate and the four side plates. Then, by determining the center position of the side plate and locating the processing position of the through hole, the through hole can be processed using a small electric drill without CNC processing. Optionally, the thickness of the bottom plate and the side plate is greater than or equal to 3 mm to ensure the structural strength of the box body.

[0044] Optionally, the material of the box body 1 is high dielectric strength plastic or high dielectric strength plastic composite material, which is easy to obtain, low cost, and prevents the box body 1 from being electrically broken down. Exemplarily, the material of the box body 1 is acrylic (PMMA), polyimide (PI), polytetrafluoroethylene (PTFE) or nylon (PA), or PMMA with a PI film attached to the outer surface, or a composite material made of PI and PMMA.

[0045] Optionally, the electrode rod 21 and the electrode head 22 are made of the same material, and both are stainless steel or pure copper, and have good electrical conductivity.

[0046] Optionally, the nut 23 is made of insulating material. Exemplarily, the nut 23 is made of high dielectric strength plastic or high dielectric strength plastic composite material to prevent the nut 23 from being electrically broken down, specifically PMMA, PP, nylon (PA) or polyimide (PI).

[0047] Optionally, a cross-shaped or straight-shaped screw head is provided at the outer end of the electrode rod 21. When adjusting the position of the electrode rod 21, it is convenient to use other tools to cooperate with the cross-shaped or straight-shaped screw head to rotate the electrode rod 21.

[0048] The present invention also provides a method for testing the dielectric strength of a liquid, using the above-mentioned liquid dielectric strength testing device to test the dielectric strength of a liquid material, comprising:

[0049] S1. According to the insulation properties of the liquid material, loosen the nut 23 and adjust the positions of the two electrode rods 21 so that the electrode distance between the two electrode heads 22 reaches the set distance. After adjustment, tighten the nut 23 to fix the electrode rod 21 to the box body 1.

[0050] Specifically, among multiple position locators with different thicknesses, a position locator with a thickness that matches the insulating properties of the liquid material to be tested is selected, and the position locator is placed between the two electrode heads 22. The nut 23 is loosened and the positions of the two electrode rods 21 are adjusted so that the two electrode heads 22 are both in contact with the position locator. After adjustment, the position locator is taken out and the nut 23 is tightened to fix the electrode rod 21 to the box body 1.

[0051] S2. According to the flow properties of the liquid material, the liquid is poured into the box body 1 through the liquid injection piece or the liquid is injected into the outer surfaces of the two electrode heads 22 close to each other, so that the liquid fills the gap between the two electrode heads 22;

[0052] S3, connecting the two test ends of the dielectric strength tester to the outer ends of the two electrode rods 21 one by one, and after the corresponding connection, starting the dielectric strength tester to apply an electric field to the liquid.

[0053] For example, a spherical electrode head 22 with a diameter of 12.7 mm is used to test the liquid material. When the liquid material is thermal conductive paste, the electrode distance is adjusted to 1 mm by a position locator with a thickness of 1 mm, and the breakdown voltage is measured to be 5 KV, and the dielectric strength is 5 KV / mm. When the liquid material is insulating grease, the insulating performance of insulating grease is better than that of thermal conductive paste, and the electrode distance needs to be reduced. Therefore, the electrode distance is adjusted to 0.5 mm by a position locator with a thickness of 0.5 mm, and the breakdown voltage is measured to be 6 KV, and the dielectric strength is 12 KV / mm.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A liquid dielectric strength testing device, characterized in that: include: A box body (1), wherein the box body (1) is provided with two penetration holes opposite to each other; Two electrode assemblies (2), the two electrode assemblies (2) are arranged opposite to each other and are respectively provided with two said penetration holes; the electrode assembly (2) comprises an electrode rod (21), an electrode head (22) and a nut (23); the electrode rod (21) is a screw rod, and the electrode head (22) is threadedly connected to the inner end of the electrode rod (21); two said nuts (23) are respectively provided at both ends of each said penetration hole, and the two said nuts (23) are both threadedly connected to the corresponding electrode rod (21) for fixing the electrode rod (21) to the box body (1); A liquid injection member, used for pouring liquid into the box body (1) or injecting liquid into the outer surfaces of the two electrode heads (22) close to each other, so that the liquid fills the gap between the two electrode heads (22); A dielectric strength tester is located outside the box body (1), and two test ends of the dielectric strength tester are respectively connected to the outer ends of the two electrode rods (21) in a one-to-one correspondence, so as to apply an electric field to the liquid.

2. The liquid dielectric strength testing device according to claim 1, characterized in that: The liquid dielectric strength testing device further comprises a plurality of position positioning members of different thicknesses, wherein the position positioning member can be selectively arranged between the two electrode heads (22), and the two ends of the position positioning member are respectively fitted with the two electrode heads (22) to limit the electrode distance between the two electrode heads (22).

3. The liquid dielectric strength testing device according to claim 1, characterized in that: The nut (23) is a flange nut, comprising a nut portion and a flange portion fixed to one side of the nut portion, and the outer diameter of the flange portion is greater than the diameter of the through hole.

4. The liquid dielectric strength testing device according to claim 1, characterized in that: The box body (1) comprises a box body and a box cover, wherein the box cover is arranged on the box body in an openable and closable manner, and the box body is provided with two penetration holes opposite to each other.

5. The liquid dielectric strength testing device according to claim 4, characterized in that: The box body comprises a bottom plate and four side plates surrounding the bottom plate. The four side plates are all bonded to the bottom plate, and two adjacent side plates are bonded end to end.

6. The liquid dielectric strength testing device according to claim 5, characterized in that: The thickness of the bottom plate and the side plate is greater than or equal to 3 mm.

7. The liquid dielectric strength testing device according to claim 1, characterized in that: The box body (1) is made of high dielectric strength plastic or high dielectric strength plastic composite material; and / or, The electrode rod (21) and the electrode head (22) are made of the same material, and are both made of stainless steel or pure copper; and / or, The nut (23) is made of high dielectric strength plastic or high dielectric strength plastic composite material.

8. The liquid dielectric strength testing device according to claim 1, characterized in that: The outer end of the electrode rod (21) is provided with a cross-shaped or straight-shaped screw head; and / or, The electrode head (22) is a hemispherical structure, a flat plate structure or a spherical structure.

9. A method for testing the dielectric strength of a liquid, using the device for testing the dielectric strength of a liquid as claimed in any one of claims 1 to 8, characterized in that: include: S1. According to the insulating properties of the liquid material, loosen the nut (23) and adjust the positions of the two electrode rods (21) so that the electrode distance between the two electrode heads (22) reaches a set distance. After the adjustment, tighten the nut (23) to fix the electrode rod (21) to the box body (1); S2. According to the flow properties of the liquid material, the liquid is poured into the box body (1) through the liquid injection piece or the liquid is injected into the outer surfaces of the two electrode heads (22) close to each other, so that the liquid fills the gap between the two electrode heads (22); S3, connecting the two test ends of the dielectric strength tester to the outer ends of the two electrode rods (21) in a one-to-one correspondence, and after the corresponding connection, starting the dielectric strength tester to apply an electric field to the liquid.

10. The method for testing the dielectric strength of liquid according to claim 9, characterized in that: Step S1 specifically comprises: selecting a position locator with a thickness matching the insulating performance of the liquid material to be tested from among a plurality of position locators with different thicknesses, placing the position locator between the two electrode heads (22), loosening the nut (23) and adjusting the positions of the two electrode rods (21) so that the two electrode heads (22) are both in contact with the position locator; after adjustment, taking out the position locator and tightening the nut (23) to fix the electrode rod (21) to the box body (1).

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