Pressure resistance test fixture for metal soft magnetic powder core

Abstract

The utility model discloses a metal soft magnetic powder core withstand voltage test fixture, which relates to the technical field of metal soft magnetic powder cores and comprises a probe support and a probe, the probe is positioned above a metal soft magnetic powder core, is mounted on a test base station through the probe support and is electrically communicated with a withstand voltage tester, and the bottom end of the probe is contacted with the top of the metal soft magnetic powder core; the probe support provides a degree of freedom of rotation around a rotating shaft which is parallel to the axis of the probe and is offset from the axis of the probe and a degree of freedom of linear motion in the vertical direction for the probe. According to the utility model, the probe bracket is used for providing the degree of freedom of off-axis rotation for the probe, so that multi-point continuous sampling of the pressure resistance test of the metal soft magnetic powder core is realized by adopting the off-axis rotation mode of the probe under the condition that the probe is in good contact with the metal soft magnetic powder core, the reliability of a sample of the pressure resistance test of the metal soft magnetic powder core is optimized, and the accuracy of the pressure resistance test of the metal soft magnetic powder core is improved. And the number of samples is greatly increased, the sufficiency of the test samples is improved, and the accuracy of the pressure resistance test result is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of metal soft magnetic powder cores, in particular to a fixture used for metal soft magnetic powder core withstand voltage testing. Background Art

[0002] Metal soft magnetic powder core is a magnetic core made of metal or alloy soft magnetic materials through a special process. According to different components, it is divided into common types such as iron silicon aluminum magnetic powder core, iron silicon powder core, iron nickel powder core and iron nickel molybdenum powder core. Metal soft magnetic powder core has excellent DC bias characteristics, low loss, high energy storage characteristics, and temperature stability. It is suitable for the preparation of power electronic devices such as chokes under large currents, high energy storage power inductors, PFC inductors, etc., and plays the role of filtering, voltage conversion, power correction, etc. It is widely used in photovoltaic inverters, new energy vehicle on-board electronics, charging piles and other fields.

[0003] Metal soft magnetic powder cores are commonly in the shape of ring, square, E-shaped or U-shaped, among which the ring shape is the most common. The surface of the metal soft magnetic powder core is covered with an insulating layer to ensure surface insulation and oxidation resistance; at the same time, in order to meet the assembly requirements of power electronic devices in the later stage, the insulating layer on the surface of the metal soft magnetic powder core needs to have a certain pressure resistance.

[0004] Taking the annular metal soft magnetic powder core as an example, in the prior art, the withstand voltage test process of the insulating layer on the surface of the metal soft magnetic powder core is to directly connect one end of the test instrument's wiring to the copper substrate set on the test base, and the metal soft magnetic powder core is placed on the copper substrate to maintain good contact with the copper substrate. The other end of the test instrument's wiring is held by the staff to maintain contact with the upper surface of the metal soft magnetic powder core, and the test is carried out by taking multiple points to observe whether the leakage current value exceeds the standard value to determine whether the withstand voltage of the insulating layer on the surface of the metal soft magnetic powder core is qualified. The number of points taken in this withstand voltage test method is extremely limited and highly random, and there are obvious safety hazards. Utility Model Content

[0005] The utility model provides a metal soft magnetic powder core withstand voltage test fixture to avoid the above-mentioned deficiencies in the prior art.

[0006] The utility model adopts the following technical solutions to solve the technical problems: a metal soft magnetic powder core withstand voltage test fixture, comprising a test base with a metal copper substrate on an insulating table, the metal copper substrate being electrically connected to the withstand voltage tester, the metal soft magnetic powder core being placed on the metal copper substrate and maintaining contact with the metal copper substrate, and also comprising a probe bracket and a probe;

[0007] The probe is located above the metal soft magnetic powder core, is installed on the test base through the probe bracket, is electrically connected to the withstand voltage tester, and has its bottom end in contact with the top of the metal soft magnetic powder core;

[0008] The probe support provides the probe with the freedom of rotation about a rotation axis which is parallel to and offset from the axis of the probe, and the freedom of linear motion in a vertical direction.

[0009] Further, the probe bracket includes a connecting end, a rotating fixed sleeve, a vertical rod, a fastening bolt and a cross bar;

[0010] The connecting end, the rotating fixed sleeve and the vertical rod are arranged in sequence from bottom to top, and the connecting end is fixedly installed with the connecting seat correspondingly arranged on the test base, and the vertical rod is arranged upright, and its bottom end is rotatably installed and connected with the connecting end through the rotating fixed sleeve;

[0011] The cross bar is arranged radially outwardly along the vertical pole, and its front end is in a ring structure, which is sleeved on the vertical pole to form a sliding pair along the vertical direction with the vertical pole; the ring structure is threadedly provided with the fastening bolt, and the cross bar can slide up and down along the vertical pole when the fastening bolt is unlocked, and is limited and fixed with the vertical pole when the fastening bolt is locked;

[0012] The probe is mounted and fixed on the cross bar.

[0013] Furthermore, the connecting end is provided with an external thread, and the connecting seat is a columnar structure with a threaded hole provided at the upper end, and the connecting end is threadedly inserted into the connecting seat for installation and fixation.

[0014] Furthermore, the probe support further comprises a probe electrode fixed on the crossbar;

[0015] The probe electrode is electrically connected to the withstand voltage tester through a wire, and the probe electrode is in contact and conductive with the probe, so that the probe is electrically connected to the withstand voltage tester.

[0016] Furthermore, the cross bar is a telescopic rod.

[0017] Furthermore, it also includes a test cover plate, and the test base is also provided with a test material box;

[0018] The test material box is fixed on the insulating table top, with an open top, and the metal copper substrate is arranged in the test material box;

[0019] The metal soft magnetic powder core is placed in the test material box, and the remaining gap in the test material box is filled with conductive sand; the test cover plate is covered on the top of the conductive sand, and a limiting hole adapted to the metal soft magnetic powder core is provided on the cover, and the metal soft magnetic powder core is limited in the limiting hole.

[0020] Furthermore, the test cover plate is made of insulating material.

[0021] Furthermore, the test base is also provided with a test electrode;

[0022] The test electrode is electrically connected to the metal copper substrate, fixed on the top of the insulating table, and located outside the test material box.

[0023] Furthermore, the test base also includes a base bracket;

[0024] The base bracket is fixed to the bottom of the insulating table top and is used to support the insulating table top.

[0025] The utility model provides a metal soft magnetic powder core withstand voltage test fixture, which has the following beneficial effects:

[0026] 1. The utility model provides the probe with the freedom of eccentric rotation by means of the probe bracket, so as to realize multi-point continuous sampling of the metal soft magnetic powder core pressure resistance test by means of eccentric rotation of the probe while maintaining good contact between the probe and the metal soft magnetic powder core, thereby optimizing the reliability of the samples of the pressure resistance test of the metal soft magnetic powder core, greatly increasing the number of samples, improving the adequacy of the test samples, and facilitating the accuracy of the pressure resistance test results.

[0027] 2. During the entire process of the pressure resistance test of the metal soft magnetic powder core, the utility model does not require the staff to directly contact the conductor structure such as the metal soft magnetic powder core and the conductive substrate, thereby eliminating the safety hazards of the pressure resistance test of the metal soft magnetic powder core and ensuring the personal safety of the staff.

[0028] 3. The probe bracket of the utility model can adapt to the testing needs of metal soft magnetic powder cores of different shapes and sizes by rotating the sliding pair between the fixed shaft sleeve and the vertical rod and the telescopicity of the cross rod, and has good versatility and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the explosion structure of the utility model;

[0030] Figure 2 It is a schematic diagram of the working state of the utility model.

[0031] In the figure:

[0032] 1. Test base, 11. Insulating table, 12. Test material box, 13. Metal copper substrate, 14. Connecting seat, 15. Test electrode, 16. Base bracket; 2. Test cover plate, 21. Limiting hole; 3. Probe bracket, 31. Connecting end, 32. Rotating fixed sleeve, 33. Vertical pole, 34. Ring structure, 35. Cross bar, 36. Probe electrode; 4. Probe; 5. Metal soft magnetic powder core. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] A metal soft magnetic powder core withstand voltage test fixture, such as Figure 1~Figure 2 As shown, the structural relationship is as follows: it includes a test base 1 provided with a metal copper substrate 13 on an insulating table 11, the metal copper substrate 13 is electrically connected to a withstand voltage tester, a metal soft magnetic powder core 5 is placed on the metal copper substrate 13 and keeps contact with the metal copper substrate 13, and also includes a probe bracket 3 and a probe 4;

[0035] The probe 4 is located above the metal soft magnetic powder core 5, and is mounted on the test base 1 through the probe bracket 3, and is electrically connected to the withstand voltage tester, and its bottom end is in contact with the top of the metal soft magnetic powder core 5;

[0036] The probe support 3 provides the probe 4 with the freedom of rotation about a rotation axis which is parallel to and offset from the axis of the probe 4 , and the freedom of linear motion in the vertical direction.

[0037] Preferably, the probe bracket 3 includes a connecting end 31, a rotating fixed sleeve 32, a vertical rod 33, a fastening bolt and a cross bar 35;

[0038] The connecting end 31, the rotating fixed shaft sleeve 32 and the vertical rod 33 are arranged in sequence from bottom to top, and the connecting end 31 is fixedly installed with the connecting seat 14 correspondingly arranged on the test base 1, and the vertical rod 33 is arranged upright, and its bottom end is rotatably installed and connected with the connecting end 31 through the rotating fixed shaft sleeve 32;

[0039] The cross bar 35 is arranged radially outwardly along the vertical rod 33, and its front end is a ring structure 34, which is sleeved on the vertical rod 33 to form a sliding pair along the vertical direction with the vertical rod 33; a fastening bolt is threadedly provided on the ring structure 34, and the cross bar 35 can slide up and down along the vertical rod 33 when the fastening bolt 34 is unlocked, and is limited and fixed with the vertical rod 33 when the fastening bolt 34 is locked;

[0040] The probe 4 is mounted and fixed on the cross bar 35 .

[0041] Preferably, the connection end 31 is provided with an external thread, and the connection seat 14 is a columnar structure with a threaded hole at the upper end, and the connection end 31 is threadedly inserted into the connection seat 14 for installation and fixation.

[0042] Preferably, the probe support 3 further includes a probe electrode 36 fixed on the crossbar 35;

[0043] The probe electrode 36 is electrically connected to the withstand voltage tester through a wire, and the probe electrode 36 is in contact with the probe 4 to be electrically connected to the withstand voltage tester.

[0044] Preferably, the cross bar 35 is a telescopic rod.

[0045] Preferably, it further comprises a test cover plate 2, and the test base 1 is further provided with a test material box 12;

[0046] The test material box 12 is fixed on the insulating table 11, with its top open, and the metal copper substrate 13 is arranged in the test material box 12;

[0047] The metal soft magnetic powder core 5 is placed in the test box 12, and the remaining space in the test box 12 is filled with conductive sand; the test cover plate 2 is covered on the top of the conductive sand, and a limiting hole 21 adapted to the metal soft magnetic powder core 5 is opened on it, and the metal soft magnetic powder core 5 is limited in the limiting hole 21.

[0048] Preferably, the test cover plate 2 is made of insulating material to shield the conductive sand and play an insulating and protective role.

[0049] Preferably, the test base 1 is further provided with a test electrode 15;

[0050] The test electrode 15 is electrically connected to the metal copper substrate 13 , fixed on the top of the insulating table 11 , and located outside the test material box 12 .

[0051] In actual experiments, the staff can conveniently connect the withstand voltage tester with the metal copper substrate 13 by electrically connecting the withstand voltage tester with the test electrode 15 .

[0052] Preferably, the test base 1 further includes a base support 16;

[0053] The base support 16 is fixedly disposed at the bottom of the insulating table top 11 to support the insulating table top 11 .

[0054] The following uses a ring-shaped metal soft magnetic powder core as an example to explain the working method of the above test fixture. When used specifically, it includes the following processes:

[0055] In the first step, the metal soft magnetic powder core is placed in the test material box 12 , and the connection seat 14 passes through the metal soft magnetic powder core, while maintaining good contact between the metal soft magnetic powder core and the metal copper substrate 13 .

[0056] In the second step, the connecting end 31 is fixedly mounted on the connecting seat 14 , and the vertical rod 33 is rotatably mounted on the connecting end 31 by rotating the fixing sleeve 32 .

[0057] The third step is to densely fill the test material box 12 with conductive sand until the top of the conductive sand is flush with the upper surface of the metal soft magnetic powder core, and then cover the test cover plate 2 to the top of the conductive sand to flatten the upper surface of the conductive sand. At the same time, the metal soft magnetic powder core should be limited to the limit hole 21, and the connecting seat 14 should be located at the center of the metal soft magnetic powder core;

[0058] The fourth step is to telescope the cross bar 35 so that the probe 4 is located directly above the annular surface of the metal soft magnetic powder core, then unlock the fastening bolt 34, slide the fastening bolt 34 down along the vertical rod 33 until the bottom end of the probe 4 contacts the upper surface of the metal soft magnetic powder core, and then tighten the fastening bolt 34.

[0059] In the fifth step, the two ends of the withstand voltage tester are electrically connected to the test electrode 15 and the probe electrode 36 respectively, so that the withstand voltage tester, the test electrode 15, the metal copper substrate 13, the metal soft magnetic powder core, the probe 4 and the probe electrode 36 are electrically connected to form a loop.

[0060] The sixth step is to set the test parameters and then conduct a pressure resistance test on the metal soft magnetic powder core. During the test, the contact position between the probe 4 and the metal soft magnetic powder core is changed by rotating the vertical rod 33 to achieve multi-point continuous sampling of the pressure resistance test of the metal soft magnetic powder core.

[0061] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A metal soft magnetic powder core withstand voltage test fixture, comprising a test base (1) provided with a metal copper substrate (13) on an insulating table top (11), the metal copper substrate (13) being electrically connected to a withstand voltage tester, the metal soft magnetic powder core (5) being placed on the metal copper substrate (13) and maintaining contact with the metal copper substrate (13), characterized in that: It also includes a probe holder (3) and a probe (4); The probe (4) is located above the metal soft magnetic powder core (5), is mounted on the test base (1) through the probe bracket (3), is electrically connected to the withstand voltage tester, and has a bottom end in contact with the top of the metal soft magnetic powder core (5); The probe bracket (3) provides the probe (4) with the freedom of rotation about a rotation axis that is parallel to and offset from the axis of the probe (4), and the freedom of linear motion in a vertical direction.

2. A metal soft magnetic powder core withstand voltage test fixture according to claim 1, characterized in that: The probe bracket (3) comprises a connecting end (31), a rotating fixed shaft sleeve (32), a vertical rod (33), a fastening bolt and a cross rod (35); The connecting end (31), the rotating fixed shaft sleeve (32) and the vertical rod (33) are arranged in sequence from bottom to top, and the connecting end (31) is installed and fixed to a connecting seat (14) correspondingly arranged on the test base (1), and the vertical rod (33) is arranged upright, and its bottom end is rotatably installed and connected to the connecting end (31) through the rotating fixed shaft sleeve (32); The cross bar (35) is arranged radially outwardly of the vertical bar (33), and its front end is in the form of a ring structure (34), which is sleeved on the vertical bar (33) to form a sliding pair along the vertical direction with the vertical bar (33); the ring structure (34) is threadedly provided with the fastening bolt, and the cross bar (35) can slide up and down along the vertical bar (33) when the fastening bolt is unlocked, and is limitedly fixed with the vertical bar (33) when the fastening bolt is locked; The probe (4) is mounted and fixed on the cross bar (35).

3. A metal soft magnetic powder core withstand voltage test fixture according to claim 2, characterized in that: The connecting end (31) is provided with an external thread, the connecting seat (14) is a columnar structure with a threaded hole at the upper end, and the connecting end (31) is threadedly inserted into the connecting seat (14) for installation and fixation.

4. A metal soft magnetic powder core withstand voltage test fixture according to claim 2, characterized in that: The probe support (3) further comprises a probe electrode (36) fixedly mounted on the crossbar (35); The probe electrode (36) is electrically connected to the withstand voltage tester via a wire, and the probe electrode (36) is in contact and conduction with the probe (4), so that the probe (4) is electrically connected to the withstand voltage tester.

5. A metal soft magnetic powder core withstand voltage test fixture according to any one of claims 2 to 4, characterized in that: The cross bar (35) is a telescopic bar.

6. The metal soft magnetic powder core withstand voltage test fixture according to claim 1, characterized in that: It also includes a test cover plate (2), and the test base (1) is also provided with a test material box (12); The test material box (12) is fixedly mounted on the insulating tabletop (11), with its top being open, and the metal copper substrate (13) is arranged inside the test material box (12); The metal soft magnetic powder core (5) is placed in the test material box (12), and the remaining space in the test material box (12) is filled with conductive sand; the test cover plate (2) is covered on the top of the conductive sand, and a limiting hole (21) adapted to the metal soft magnetic powder core (5) is provided thereon, and the metal soft magnetic powder core (5) is limited in the limiting hole (21).

7. A metal soft magnetic powder core withstand voltage test fixture according to claim 6, characterized in that: The test cover plate (2) is made of insulating material.

8. The metal soft magnetic powder core withstand voltage test fixture according to claim 6, characterized in that: The test base (1) is also provided with a test electrode (15); The test electrode (15) is electrically connected to the metal copper substrate (13), is fixedly arranged on the top of the insulating table (11), and is located outside the test material box (12).

9. The metal soft magnetic powder core withstand voltage test fixture according to claim 1, characterized in that: The test base (1) further comprises a base support (16); The base support (16) is fixedly arranged at the bottom of the insulating table top (11) and is used to support the insulating table top (11).

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