A high-voltage direct-current relay kovar assembly drawing force testing device

Abstract

The utility model relates to high -voltage direct current relay kovar assembly drawing force testing arrangement, including kovar insert block, the ceramic arc extinguishing chamber is set on, passes through the ceramic arc extinguishing chamber along the connecting hole on the ceramic arc extinguishing chamber, support block contacts kovar insert block, wherein the recess is formed between the cover body of ceramic arc extinguishing chamber and kovar metal, kovar insert block is inserted into the recess, support block contacts kovar insert block away from the surface of kovar metal, one end of the pull column away from kovar insert block stretches out the ceramic arc extinguishing chamber, the one end of pull column close to kovar insert block is provided with first reducing section, the diameter of first reducing section is greater than the diameter of connecting hole, the utility model can test the drawing force between ceramic arc extinguishing chamber and kovar metal by pulling away support block and pull column, avoid directly clamping fragile ceramic arc extinguishing chamber, also avoid directly clamping small area kovar metal, simplify clamping.

Description

Technical Field

[0001] This utility model relates to the field of relay production equipment technology, and in particular to a device for testing the pull-out force of Kovar components in high-voltage DC relays. Background Technology

[0002] The ceramic arc-extinguishing chamber is composed of a ceramic arc-extinguishing cover and Kovar metal brazing. It can significantly improve the current carrying capacity and withstand voltage of high-voltage DC relays, making it a key component in new energy vehicles.

[0003] Brazing requires high temperatures in a vacuum or hydrogen-nitrogen mixed gas environment. Factors such as solder melting time, fixture, temperature profile, products inside the furnace, and weather conditions all affect brazing quality, leading to inconsistencies. In actual welding, frequent checks of the pull-out force at the brazed location are necessary to ensure quality standards are met. Ceramic arc-extinguishing chambers, made of brittle ceramic material, are prone to breakage during conventional clamping. Furthermore, the Kovar metal in the ceramic arc-extinguishing chamber is very small, with a clamping width of only about 4mm. This makes clamping the ceramic arc-extinguishing chamber with pull-out force testing equipment extremely difficult, impacting brazing efficiency.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] To address the shortcomings of the existing technology, the purpose of this invention is to provide a pull-out force testing device for Kovar components in high-voltage DC relays, so as to quickly detect the brazing quality between the ceramic arc extinguishing chamber and the Kovar metal.

[0006] The technical solution of this utility model is as follows: The high-voltage DC relay Kovar component pull-out force testing device includes: Kovar insert is fitted onto the ceramic arc-extinguishing cover; A pull column passes through the ceramic arc-extinguishing cover along the connecting hole on the ceramic arc-extinguishing cover; The support block contacts the Kovar plug block; In this configuration, a groove is formed between the ceramic arc-extinguishing shroud and the Kovar metal; the Kovar plug is inserted into the groove; the support block contacts the surface of the Kovar plug away from the Kovar metal; one end of the pull post away from the Kovar plug extends out of the ceramic arc-extinguishing shroud; a first variable diameter section is provided at one end of the pull post near the Kovar plug; the diameter of the first variable diameter section is larger than the diameter of the connecting hole.

[0007] A further technical solution is that the Kovar plug includes a first plug and a second plug; a positioning protrusion extends from the first plug; and a positioning hole is formed on the second plug to engage with the positioning protrusion.

[0008] A further technical solution is that an upper pull block is also provided; the upper pull block is threadedly connected to the support block; the Kovar plug is disposed between the upper pull block and the support block; and an upper pull rod is provided on the side of the upper pull block away from the Kovar plug.

[0009] A further technical solution is that a pressure block is provided between the Kovar insert block and the pull block; the Kovar metal extends between the pressure block and the Kovar insert block.

[0010] A further technical solution is to provide a gasket between the pressure block and the pull block.

[0011] A further technical solution is to provide a pull-down block; a slot is provided on the pull-down block; a second variable diameter section with a reduced diameter is provided on the pull column; the second variable diameter section passes through the pull-down block along the slot.

[0012] A further technical solution is that the inner surface of the Kovar plug is provided with a first extension; the first extension extends into the groove.

[0013] A further technical solution is that two tie rods are provided.

[0014] A further technical solution is to provide a limiting block; both pull columns pass through the limiting block simultaneously; the limiting block is located between the first variable diameter section and the ceramic arc extinguishing cover.

[0015] A further technical solution is that the support block is cylindrical; the ceramic arc-extinguishing hood is disposed inside the cylindrical support block.

[0016] The beneficial technical effects of this utility model are as follows: (1) The high-voltage DC relay Kovar assembly pull-out force testing device of this utility model is provided with a Kovar plug, a pull post, and a support block. The Kovar plug is inserted into the groove between the ceramic arc-extinguishing shroud and the Kovar metal and is held in place by the support block. The pull post extends out of the ceramic arc-extinguishing shroud along the connecting hole away from the Kovar plug. When testing the pull-out force between the ceramic arc-extinguishing shroud and the Kovar metal, the support block and pull post can be pulled away directly. This avoids damage caused by directly clamping the ceramic arc-extinguishing shroud made of ceramic material, and also avoids the difficulty of clamping the small clamping part of the Kovar metal, which is difficult to clamp. This greatly simplifies the clamping of the ceramic arc-extinguishing shroud. At the same time, the setting of the support block and the pull post is also very simple, which significantly improves the efficiency of the pull-out force testing of the ceramic arc-extinguishing shroud and improves the production efficiency of the ceramic arc-extinguishing shroud.

[0017] (2) Furthermore, the Kovar plug is configured as a first plug and a second plug in a split manner, which makes it easier to fit the Kovar plug onto the ceramic arc extinguishing cover and improve the assembly efficiency of the Kovar plug.

[0018] (3) Furthermore, the support block is cylindrical to uniformly support the Kovar insert in the circumferential direction. During stretching, the tensile force can also be uniformly transmitted to the Kovar insert and Kovar metal along the support block, ensuring that the tensile force is axially consistent, reducing the error caused by off-center loading, and improving the accuracy of the pull-out force test. Attached Figure Description

[0019] Figure 1 A vertical cross-sectional schematic diagram of a high-voltage DC relay Kovar component pull-out force testing device according to an embodiment of the present disclosure is shown.

[0020] Figure 2 An exploded structural schematic diagram of a high-voltage DC relay Kovar component pull-out force testing device according to an embodiment of the present disclosure is shown.

[0021] Figure 3 A partially enlarged view of point A is shown of a high-voltage DC relay Kovar component pull-out force testing apparatus according to an embodiment of the present disclosure.

[0022] Marked in the attached diagram: 1. Upper pull block; 11. Upper pull rod; 12. Washer; 13. Pressure block; 2. Lower pull block; 21. Lower pull rod; 22. Slot; 3. Kovar insert block; 31. First insert block; 311. Positioning protrusion; 32. Second insert block; 321. Positioning hole; 33. First extension; 4. Pull post; 41. Limiting block; 42. First diameter changing section; 43. Second diameter changing section; 5. Support block; 51. Second extension; 6. Ceramic arc extinguishing cover; 61. Kovar metal; 611. Flanged edge; 62. Groove; 63. Connecting hole; 64. Cover body. Detailed Implementation

[0023] To make the objectives, features, and advantages of this utility model more apparent and understandable, please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the implementation conditions of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model.

[0024] In the description of this utility model, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Figure 1 A vertical cross-sectional schematic diagram of a high-voltage DC relay Kovar component pull-out force testing device according to an embodiment of the present disclosure is shown. Figure 2 An exploded structural schematic diagram of a high-voltage DC relay Kovar component pull-out force testing device according to an embodiment of the present disclosure is shown. Figure 3 A partially enlarged view at point A is shown of a high-voltage DC relay Kovar assembly pull-out force testing apparatus according to an embodiment of this disclosure. Please refer to... Figure 1 , Figure 2 and Figure 2 The high-voltage DC relay Kovar component pull-out force testing device includes a Kovar plug 3, which is fitted onto a ceramic arc-extinguishing cover 6. A pull post 4 passes through the ceramic arc-extinguishing cover 6 along a connection hole 63. Specifically, the ceramic arc-extinguishing cover 6 includes a cover body 64 and a Kovar metal 61 brazed to the cover body 64. The cover body 64 has a connection hole 63 to facilitate subsequent welding of a conductor (not shown in the figure). A support block 5 contacts the Kovar plug 3. A groove 62 is formed between the cover body 64 and the Kovar metal 61 of the ceramic arc-extinguishing cover 6. Specifically, one end of the Kovar metal 61 is brazed to the ceramic arc-extinguishing cover 6, and the other end is bent to form a flange 611. A groove 62 is formed between the flange 611 and the end face of the ceramic arc-extinguishing cover 6. The Kovar plug 3 is inserted into the groove 62. The support block 5 contacts the surface of the Kovar plug 3 away from the Kovar metal 61. The end of the pull post 4 away from the Kovar plug 3 extends out of the ceramic arc-extinguishing cover 6. A first reducing section 42 is provided at the end of the pull post 4 near the Kovar insert 3. The diameter of the first reducing section 42 is larger than the diameter of the connecting hole 63, which restricts the position between the pull post 4 and the ceramic arc-extinguishing chamber 6, facilitating the pulling of the pull post 4 and the support block 5 in a reverse direction. When testing the pull-out force between the ceramic arc-extinguishing chamber 6 and the Kovar metal 61, the support block 5 and the pull post 4 can be pulled in a reverse direction. This avoids damage caused by directly clamping the ceramic arc-extinguishing chamber 6, and also avoids the difficulty of clamping the small clamping part of the Kovar metal 61, greatly simplifying the clamping of the ceramic arc-extinguishing chamber 6. At the same time, the setting of the support block 5 and the pull post 4 is also very simple, significantly improving the efficiency of the pull-out force test of the ceramic arc-extinguishing chamber 6 and improving the production efficiency of the ceramic arc-extinguishing chamber 6.

[0026] Please refer to Figure 1 and Figure 3The Kovar insert 3 includes a first insert 31 and a second insert 32. A positioning protrusion 311 extends from the first insert 31. A positioning hole 321 is formed on the second insert 32 to engage with the positioning protrusion 311. The Kovar insert 3 is configured as a split unit, consisting of the first insert 31 and the second insert 32, which facilitates its placement on the ceramic arc-extinguishing cover 6, improving assembly efficiency. The positioning hole 321 and the positioning protrusion 311 can be an interference fit.

[0027] Preferably, a pressure block 13 is provided between the Kovar insert 3 and the upper pull block 1. A Kovar metal 61 extends between the pressure block 13 and the Kovar insert 3. The Kovar metal 61 is clamped between the pressure block 13 and the Kovar insert 3. This prevents the Kovar metal 61 from deforming and sliding relative to the Kovar insert 3 during the pull-out force test, thus avoiding any impact on the test results. The pressure block 13 is annular and surrounds the limiting block 41. The upper pull block 1 simultaneously contacts and presses against the pressure block 13 and the pull post 4 via a gasket 12.

[0028] More preferably, the inner surface of the Kovar insert 3 is provided with a first extension 33, which extends into the groove 62 to fit the Kovar insert 3 onto the pressure block 13. By restricting the lateral position of the pressure block 13 by the Kovar insert 3, the pressure block 13 is prevented from sliding along the surface of the upper pull block 1, which would affect the fixation of the Kovar metal 61 and ensure the test effect of the pull-out force.

[0029] Please refer to Figure 1 and Figure 3 The system also includes an upper pull block 1. The upper pull block 1 is threadedly connected to a support block 5. Specifically, the support block 5 is cylindrical. The inner wall of the support block 5 is threaded, and the corresponding upper pull block 1 is threadedly connected to the support block 5. A ceramic arc-extinguishing cover 6 is disposed inside the cylindrical support block 5. The inner wall of the support block 5 is also provided with a second extension 51. The second extension 51 contacts the Kovar insert 3. The cylindrical support block 5 can uniformly support the Kovar insert 3 circumferentially. When the support block 5 is stretched, the tensile force can also be uniformly transmitted to the Kovar insert 3 and the Kovar metal 61 along the support block 5, ensuring that the tensile force is axially consistent, reducing the error caused by off-center loading, and improving the accuracy of the pull-out force test. The Kovar insert 3 is disposed between the upper pull block 1 and the support block 5. An upper pull rod 11 is disposed on the side of the upper pull block 1 away from the Kovar insert 3. The upper pull rod 11 can be a bolt threadedly connected to the upper pull block 1, which is convenient for clamping by a tensile testing machine (not shown in the figure). Meanwhile, the upper pull rod 11 and the upper pull block 1 are threadedly connected, and the upper pull rod 11 is directly clamped by the tensile testing machine, resulting in severe wear. The threaded connection allows the upper pull rod 11 to be quickly replaced, improving the maintenance efficiency of the high-voltage DC relay Kovar component pull-out force testing device.

[0030] Preferably, a shim 12 is provided between the pressure block 13 and the pull block 1. The shim 12 fills the gap between the pressure block 13 and the pull block 1, ensuring that the pull block 1 presses the pressure block 13 tightly, thereby pressing the flange 611 tightly.

[0031] Please refer to Figure 1 and Figure 3 Two pull columns 4 are provided. When testing the pull-out force by stretching the pull columns 4 and the support block 5, the tensile force can be evenly transmitted to the entire cover 64 along the two pull columns 4, avoiding eccentric force on the ceramic arc-extinguishing cover 6 and ensuring uniform distribution of the tensile force to improve the accuracy of the pull-out force test. The two pull columns 4 can also distribute the load and reduce the deformation of the pull columns 4 themselves. During the pull-out force test, slight vibrations may occur during stretching. The two pull columns 4 can cancel each other out the lateral forces, making the pull columns 4 more stable and reducing test errors caused by vibration.

[0032] Preferably, a limiting block 41 is also provided. Two pull posts 4 pass through the limiting block 41 simultaneously. The limiting block 41 is positioned between the first variable diameter section 42 and the ceramic arc-extinguishing casing 6, with the limiting block 41 abutting against the end of the casing 64. The first variable diameter section 42 presses against the limiting block 41. The limiting block 41 prevents the first variable diameter section 42 from directly contacting and damaging the ceramic arc-extinguishing casing 6, and simultaneously disperses the load transmitted by the first variable diameter section 42, preventing localized stress concentration on the ceramic arc-extinguishing casing 6.

[0033] More preferably, a pull-down block 2 is also provided. A slot 22 is formed on the pull-down block 2. The slot 22 can be an open slot communicating with the end face of the pull-down block 2, facilitating the insertion of the pull post 4 into the slot 22. A second variable diameter section 43 with a reduced diameter is provided on the pull post 4. The second variable diameter section 43 passes through the pull-down block 2 along the slot 22. The width of the open slot is less than the diameter of the pull post 4, and the width of the open slot is greater than the diameter of the second variable diameter section 43, to limit the position between the pull-down block 2 and the pull post 4. A pull-down rod 21 is provided on the side of the pull-down block 2 away from the ceramic arc-extinguishing chamber. The pull-down rod 21 can be a bolt threaded onto the pull-down block 2, facilitating clamping by a tensile testing machine. Simultaneously, the pull-down rod 21 and the pull-down block 2 are threadedly connected, while the pull-down rod 21, directly clamped by the tensile testing machine, suffers severe wear. The threaded connection allows the pull-down rod 21 to be quickly replaced, improving the maintenance efficiency of the high-voltage DC relay Kovar component pull-out force testing device.

[0034] The specific workflow of this utility model is as follows: Insert the first insert 31 and the second insert 32 into the groove 62, align and insert the positioning protrusion 311 and the positioning hole 321, and fit the entire Kovar insert 3 onto the ceramic arc extinguishing cover 6. Move the limiting block 41 onto the cover 64, and the pull column 4 passes through the limiting block 41 and through the cover 64 along the connecting hole 63. The first variable diameter section 42 is located on the side near the limiting block 41. Place the pressure block 13 into the Kovar insert 3, and place the shim 12 on the pressure block 13. At this time, the pressure block 13 cooperates with the Kovar insert 3 to clamp the flange 611. Then thread the upper pull block 1 and the support block 5. Move the lower pull block 2, and the second variable diameter section 43 passes through the lower pull block 2 along the slot 22. Finally, install the entire high voltage DC relay Kovar assembly pull-out force testing device on the tensile testing machine (not shown in the figure), and connect the upper pull rod 11 and the lower pull rod 21 to the two ends of the tensile testing machine. When replacing the ceramic arc-extinguishing chamber for testing, separate the upper pull block 1 and the support block 5, remove the lower pull column 4 and the limit block 41, and then separate the first insert block 31 and the second insert block 32 to remove the ceramic arc-extinguishing chamber. After that, other ceramic arc-extinguishing chambers can be replaced for testing.

[0035] The various technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A device for testing the pull-out force of a Kovar component in a high-voltage DC relay, configured in conjunction with a ceramic arc-extinguishing shroud, characterized in that, The high-voltage DC relay Kovar component pull-out force testing device includes: Kovar insert is fitted onto the ceramic arc-extinguishing cover; A pull column passes through the ceramic arc-extinguishing cover along the connecting hole on the ceramic arc-extinguishing cover; The support block contacts the Kovar plug block; In this configuration, a groove is formed between the ceramic arc-extinguishing shroud and the Kovar metal; the Kovar plug is inserted into the groove; the support block contacts the surface of the Kovar plug away from the Kovar metal; one end of the pull post away from the Kovar plug extends out of the ceramic arc-extinguishing shroud; a first variable diameter section is provided at one end of the pull post near the Kovar plug; the diameter of the first variable diameter section is larger than the diameter of the connecting hole.

2. The high-voltage DC relay Kovar component pull-out force testing device as described in claim 1, characterized in that: The Kovar plug includes a first plug and a second plug; a positioning protrusion extends from the first plug; a positioning hole is formed on the second plug to engage with the positioning protrusion.

3. The high-voltage DC relay Kovar component pull-out force testing device as described in claim 1, characterized in that: It is also provided with an upper pull block; the upper pull block is threadedly connected to the support block; the Kovar plug is disposed between the upper pull block and the support block; an upper pull rod is provided on the side of the upper pull block away from the Kovar plug.

4. The high-voltage DC relay Kovar component pull-out force testing device as described in claim 3, characterized in that: A pressure block is provided between the Kovar insert block and the pull block; the Kovar metal extends between the pressure block and the Kovar insert block.

5. The high-voltage DC relay Kovar component pull-out force testing device as described in claim 4, characterized in that: A gasket is provided between the pressure block and the pull block.

6. The high-voltage DC relay Kovar component pull-out force testing device as described in claim 1, characterized in that: It is also provided with a pull-down block; a slot is provided on the pull-down block; a second variable diameter section with a reduced diameter is provided on the pull column; the second variable diameter section passes through the pull-down block along the slot.

7. The high-voltage DC relay Kovar component pull-out force testing device as described in claim 1, characterized in that: The inner surface of the Kovar plug is provided with a first extension; the first extension extends into the groove.

8. The high-voltage DC relay Kovar component pull-out force testing device as described in claim 1, characterized in that: Two tie rods are provided.

9. The high-voltage DC relay Kovar component pull-out force testing device as described in claim 8, characterized in that: A limiting block is also provided; both of the pull columns pass through the limiting block simultaneously; the limiting block is located between the first variable diameter section and the ceramic arc extinguishing cover.

10. The high-voltage DC relay Kovar component pull-out force testing device as described in claim 1, characterized in that: The support block is cylindrical; the ceramic arc-extinguishing hood is disposed inside the cylindrical support block.

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