Brazing jig for high-voltage direct-current relay

Abstract

The high-voltage direct-current relay brazing jig comprises an upper cover, a base and a positioning mechanism, a kovar frame piece is placed at the bottom of the inner side of the base and clamped, then a square welding flux piece is placed at the top of the kovar frame piece, the inner side of the square welding flux piece is clamped with the positioning mechanism, ceramic is placed at the top of the square welding flux piece, and the positioning mechanism is clamped with the inner side of the square welding flux piece. A round solder piece is placed on the outer side of the top end of an installation hole in the top end of the ceramic, the bottom of a copper contact is inserted into the installation hole, an upper cover is pressed at the top end of the ceramic, the inner wall of the upper cover is clamped to the side wall of the ceramic and the copper contact at the top end of the ceramic, and meanwhile the inner wall of a base is clamped to the outer side wall of the upper cover. And finally, the whole jig is placed in a brazing furnace for welding, through mutual clamping matching of the jig and the ceramic assembly, the copper contact and the ceramic are pressed and limited on the inner side of the upper cover, the upper cover is limited on the inner side of the base, the copper contact, the ceramic and the kovar frame piece cannot move relatively, the welding quality is high, the sealing performance of the ceramic cavity is guaranteed, and the welding quality is improved. And the yield of the product is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to high -voltage direct current relay technical field especially relates to high -voltage direct current relay brazing jig. BACKGROUND

[0002] The existing high -voltage direct current relay brazing jig includes tool base, positioning plate, positioning groove and positioning boss, and places the frame piece in the positioning groove before brazing, and then places the solder on the placed frame piece, and the ceramic shell is sleeved on the upper portion of the positioning boss, and the ceramic shell bottom end and the frame piece top end are welded together through the welding process, and then the static contact is inserted into the two mounting holes of the ceramic shell, and the solder is placed between the static contact and the two mounting holes, and then the ceramic shell and the two static contacts are welded together through the welding process, and the copper contact and the ceramic shell are tightly welded during the welding process of inserting the static contact into the mounting hole, and since the copper contact and the mounting hole can slide relative to each other during the welding process, the copper contact and the ceramic shell are virtual welded, and the sealing property of the ceramic cavity is insufficient, and the product output rate is low.

[0003] It should be noted that the information disclosed in the above BACKGROUND section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model discloses a high -voltage direct current relay brazing jig to solve the problem that the copper contact and the mounting hole can slide relative to each other during the welding process, the copper contact and the ceramic shell are virtual welded, the sealing property of the ceramic cavity is insufficient, and the product output rate is low.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] The high -voltage direct current relay brazing jig is used for ceramic assembly, and the ceramic assembly includes copper contact, ceramic and Kovar frame piece, the top end of the Kovar frame piece is provided with a square solder piece, the top end of the Kovar frame piece is clamped to the bottom end of the ceramic, the square solder piece is located between the top end of the Kovar frame piece and the bottom end of the ceramic, the top end of the ceramic is provided with two round solder pieces, the bottom end of the copper contact is clamped to the mounting hole of the top end of the ceramic, and the round solder piece is located between the top end of the ceramic and the copper contact, and the high -voltage direct current relay brazing jig comprises:

[0007] The bottom of the bottom side of the base is clamped to the Kovar frame piece.

[0008] An upper cover, an inner wall of the upper cover clamping the side wall of the ceramic and the two copper contacts of the top end of the ceramic, the round solder sheet clamping between the top end of the ceramic and the copper contacts, the upper cover press-fitting on the inner side of the base and the side wall of the upper cover clamping the inner wall of the base;

[0009] A positioning mechanism, provided on the bottom of the inner side of the base, clamping the inner side of the square solder sheet, limiting the circumferential movement of the square solder sheet.

[0010] Further, the positioning mechanism includes at least two positioning pins abutting the inner front end of the kovar frame, at least two positioning pins abutting the inner rear end of the kovar frame, limiting the forward and backward movement and rotation of the kovar frame, and at least one positioning pin abutting the left and right ends of the kovar frame, limiting the left and right movement of the kovar frame.

[0011] Further, the positioning pins include a conical portion and a rod portion, the bottom end of the conical portion being connected to the top end of the rod portion, the bottom end of the rod portion being connected to the bottom of the inner side of the base, and the conical portion extending out of the kovar frame and clamping the inner side of the square solder sheet.

[0012] Further, the positioning pins are six in number, the bottom of the inner side of the base is provided with six holes spaced apart along the inner frame of the kovar frame, and the bottom of the rod portion is interference-fitted in the holes.

[0013] Further, the high-voltage DC relay brazing jig further includes two counterweights, the two counterweights clamping the top of the upper cover, and the positions of the two counterweights corresponding to the top of the two copper contacts, respectively.

[0014] Further, the top end of the upper cover is provided with two first grooves, the positions of the two first grooves corresponding to the top of the two copper contacts, respectively, the shape of the first grooves corresponding to the shape of the counterweights, and the counterweights clamping in the first grooves.

[0015] Further, the bottom end of the upper cover is provided with a second groove, the shape of the second groove corresponding to the outer side of the ceramic, the top of the second groove is further provided with two third grooves, the shape of the third grooves corresponding to the shape of the top end of the copper contacts and the positions of the third grooves corresponding to the copper contacts, the top end of the copper contacts clamping in the third grooves, and the side wall and the top end of the ceramic clamping in the second groove.

[0016] Further, a fourth slot is formed in the top end of the base, and the shape of the fourth slot corresponds to the shape of the outer side of the upper cover.

[0017] Further, a fifth slot is formed in the bottom of the fourth slot, and the shape of the fifth slot corresponds to the shape of the outer side of the Kovar frame piece.

[0018] Further, the upper cover and the base are made of a material with a small coefficient of thermal expansion.

[0019] The beneficial effects of the embodiments of the utility model are as follows:

[0020] (1) The high-voltage DC relay brazing jig comprises an upper cover, a base and a positioning mechanism. Before brazing, the base is placed on the table top, the Kovar frame piece is placed at the bottom of the inner side of the base and is clamped to limit the circumferential movement of the Kovar frame piece, the square solder piece is placed on the top of the Kovar frame piece, the positioning mechanism clamps the inner side of the square solder piece to limit the circumferential movement of the square solder piece, the ceramic is placed on the top of the square solder piece, the circular solder piece is placed on the outer side of the mounting hole at the top end of the ceramic, the bottom of the copper contact is inserted into the mounting hole to limit the circumferential movement of the circular solder piece, the upper cover is pressed and assembled on the top end of the ceramic, and the inner wall of the upper cover clamps the side wall of the ceramic and the copper contact at the top end of the ceramic, while the inner wall of the base clamps the outer side wall of the upper cover to limit the circumferential movement of the upper cover. Finally, the whole jig is placed in the brazing furnace for brazing. Through the mutual clamping and cooperation of the base and the upper cover, the positioning mechanism and the ceramic assembly, the copper contact and the ceramic are pressed and positioned on the inner side of the upper cover, the upper cover is positioned on the inner side of the base, and the copper contact, the ceramic and the Kovar frame piece cannot move relatively, so that the brazing quality is high during subsequent brazing, the sealing performance of the ceramic cavity is ensured, and the product yield is improved.

[0021] (2) Further, the high-voltage DC relay brazing jig further comprises two counterweights, the two counterweights are clamped to the top of the upper cover, and the positions of the two counterweights correspond to the top of the two copper contacts respectively. The counterweights increase the pressing force of the upper cover on the copper contact, the ceramic and the Kovar frame piece through the weight of the counterweights, ensure the close and stable contact between the copper contact and the ceramic and between the ceramic and the Kovar frame piece, reduce the possibility of pores or uneven soldering during the soldering process, and further improve the brazing strength and the sealing performance of the ceramic cavity.

[0022] (III) Further, the material of the upper cover and the base is made of material with small coefficient of thermal expansion, such as high-purity graphite, quartz glass and alumina, etc. Since the brazing is carried out at high temperature, the jig and the product will expand at high temperature. The material with small coefficient of thermal expansion will not change its size significantly when the temperature changes, so that the upper cover and the base will not deform due to expansion or contraction during the temperature change, the consistency of the sealing surface is maintained, and the sealing failure of the ceramic cavity due to expansion or contraction is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an exploded view of the ceramic assembly in the high-voltage direct-current relay brazing jig of the utility model.

[0024] Figure 2 It is an exploded view of the high-voltage direct-current relay brazing jig of the utility model.

[0025] Figure 3 It is a front view structural schematic diagram of the positioning pin in the high-voltage direct-current relay brazing jig of the utility model.

[0026] In the figure:

[0027] 1, ceramic assembly; 11, copper contact; 12, ceramic; 13, Kovar frame piece; 14, square solder piece; 15, round solder piece; 2, base; 21, hole; 22, fourth groove body; 23, fifth groove body; 3, upper cover; 31, first groove body; 4, positioning pin; 41, conical part; 42, rod part; 5, counterweight. DETAILED DESCRIPTION

[0028] The specific implementation of the utility model will be described below in combination with the drawings.

[0029] In order to make the purpose, technical scheme and advantages of the utility model more clear and explicit, the device proposed by the utility model will be further described in detail below in combination with the drawings and specific implementation. According to the following description, the advantages and features of the utility model will be more clear. It should be noted that the drawings are very simplified and all use non-precise proportions, only to facilitate and clarify the purpose of assisting the description of the implementation of the utility model. In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, please refer to the drawings. It should be noted that the structure, proportion, size, etc. shown in the drawings attached to the specification are only used to cooperate with the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the conditions of the implementation of the utility model, so they do not have the technical essence, any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose of the utility model, should still fall within the scope of the technical content disclosed by the utility model.

[0030] Embodiment:

[0031] Figure 1 This is an exploded view of the ceramic component in the high-voltage DC relay brazing fixture of this utility model. Figure 1 As shown, a high-voltage DC relay brazing fixture is used for a ceramic assembly 1. The ceramic assembly 1 includes a copper contact 11, a ceramic component 12, and a Kovar frame 13. The top of the Kovar frame 13 is provided with a square solder piece 14, which is snapped into the bottom of the ceramic component 12. The square solder piece 14 is located between the top of the Kovar frame 13 and the bottom of the ceramic component 12. The top of the ceramic component 12 is provided with two circular solder pieces 15. The bottom of the copper contact 11 is snapped into the mounting hole at the top of the ceramic component 12, and the circular solder pieces 15 are located between the top of the ceramic component 12 and the copper contact 11.

[0032] Figure 2 This is an exploded view of the high-voltage DC relay brazing fixture of this utility model. Figure 2 As shown, the high-voltage DC relay brazing fixture includes a base 2, an upper cover 3, and a positioning mechanism.

[0033] like Figure 2 As shown, the inner wall of the upper cover 3 is engaged with the side wall of the ceramic 12 and the two copper contacts 11 at the top of the ceramic 12. A circular solder sheet 15 is engaged between the top of the ceramic 12 and the copper contacts 11. For example, the bottom of the upper cover 3 has a second groove, the shape of which corresponds to the outer side of the ceramic 12. The top of the second groove also has two third grooves, the shapes of which correspond to the shapes of the tops of the copper contacts 11 and their positions. The tops of the copper contacts 11 are engaged in the third grooves, and the side wall and top of the ceramic 12 are engaged in the second grooves. The upper cover 3 is press-fitted onto the inner side of the base 2, and the side wall of the upper cover 3 is engaged with the inner wall of the base 2. For example, the top of the base 2 also has a fourth groove 22, the shape of which corresponds to the shape of the outer side of the upper cover 3. The outer side of the upper cover 3 is engaged in the fourth groove 22.

[0034] like Figure 2 As shown, the bottom of the inner side of the base 2 is engaged with the Kovar frame piece 13. For example, the bottom of the fourth groove 22 is also provided with a fifth groove 23, the shape of the fifth groove 23 corresponds to the shape of the outer side of the Kovar frame piece 13, and the outer side of the Kovar frame piece 13 is engaged in the fifth groove 23.

[0035] like Figure 2 As shown, the positioning mechanism is located at the bottom of the inner side of the base 2, and engages with the inner side of the square solder sheet 14 to restrict the circumferential movement of the square solder sheet 14.

[0036] Figure 3 This is a schematic diagram of the main structure of the positioning pin in the high-voltage DC relay brazing fixture of this utility model. Figures 2-3As shown, further, the positioning mechanism comprises several positioning pins 4 made of stainless steel, at least two of which abut the front end of the inner side of the Kovar frame piece 13, at least two of which abut the rear end of the inner side of the Kovar frame piece 13, limiting the forward and backward movement and rotation of the Kovar frame piece 13, and at least one of which abuts the left and right ends of the inner side of the Kovar frame piece 13, limiting the left and right movement of the Kovar frame piece 13. As an example, the positioning pin 4 comprises a conical portion 41 and a rod portion 42, the bottom end of the conical portion 41 being connected to the top end of the rod portion 42, the bottom end of the rod portion 42 being connected to the bottom of the inner side of the base 2, and the conical portion 41 extending out of the Kovar frame piece 13 and clamping the inner side of the square solder piece 14. Specifically, there are six positioning pins 4, and six holes 21 are provided on the bottom of the inner side of the base 2 at intervals along the inner frame of the Kovar frame piece 13, and the bottom of the rod portion 42 is fitted into the hole 21.

[0037] As shown in Figure 2 Further, the high-voltage DC relay brazing jig also comprises two counterweights 5 clamped to the top of the upper cover 3, and the positions of the two counterweights 5 correspond to the top of the two copper contacts 11 respectively. The counterweight 5 is made of stainless steel, and the weight of the counterweight 5 increases the pressing force of the upper cover 3 on the copper contact 11, the ceramic 12 and the Kovar frame piece 13, ensuring the close and stable contact between the copper contact 11 and the ceramic 12, and between the ceramic 12 and the Kovar frame piece 13, reducing the possibility of pores or uneven soldering during welding, and further improving the welding strength and the sealing performance of the ceramic cavity.

[0038] As shown in Figure 2 Further, the top end of the upper cover 3 is provided with two first grooves 31 at intervals, and the positions of the two first grooves 31 correspond to the top of the two copper contacts 11 respectively. The shape of the first groove 31 corresponds to the shape of the counterweight 5, and the counterweight 5 is clamped in the first groove 31, which ensures that the counterweight 5 will not slide due to vibration or inclination during use. The clamping mode of the groove provides a fixing effect, and at the same time, the position of the counterweight 5 can accurately correspond to the top of the copper contact 11, ensuring that the pressure is evenly distributed on the copper contact 11 and the ceramic assembly 1, and facilitating the disassembly and installation of the counterweight 5, which is convenient for operation and maintenance.

[0039] As shown in Figure 2 Further, the materials of the upper cover 3 and the base 2 are made of materials with small thermal expansion coefficients, such as high-purity graphite, quartz glass and alumina, etc. Materials with small thermal expansion coefficients will not change their size significantly when the temperature changes, which ensures that the upper cover 3 and the base 2 will not deform due to expansion or contraction during temperature changes, maintains the consistency of the sealing surface, and avoids the sealing failure of the ceramic cavity due to expansion or contraction.

[0040] When the embodiment is in operation:

[0041] Put the base 2 on the table, the Kovac frame piece 13 is clamped in the fifth groove body 23, the circumferential movement of the Kovac frame piece 13 is limited, the square solder piece 14 is placed on the top end of the Kovac frame piece 13, the conical part 41 of the six positioning pins 4 clamps the inner side of the square solder piece 14, the square solder piece 14 is positioned, the circumferential movement of the square solder piece 14 is limited, the two circular solder pieces 15 are placed on the two mounting holes on the top end of the ceramic 12 respectively, the copper contact 11 is inserted into the mounting hole, the circular solder piece 15 is pressed between the ceramic 12 and the copper contact 11, the circumferential movement of the circular solder piece 15 is limited, the upper cover 3 is sleeved on the ceramic 12, the outer side of the ceramic 12 is clamped in the second groove body, the top of the copper contact 11 is clamped in the third groove body, the upper cover 3 is placed downward in the fourth groove body 22 of the base 2, the outer side of the upper cover 3 is clamped in the fourth groove body 22, the circumferential movement of the upper cover 3 is limited, then the two counterweights 5 are placed in and clamped in the first groove body 31, the upper cover 3 is pressed in the fourth groove body 22, the axial movement of the upper cover 3 is limited, finally the assembled whole jig is put into the brazing furnace for brazing.

[0042] In this embodiment, through the mutual clamping and cooperation of the base 2 and the upper cover 3, the positioning pin 4 and the ceramic assembly 1, the copper contact 11 and the ceramic 12 are pressed and limited on the inner side of the upper cover 3, the upper cover 3 is limited on the inner side of the base 2, the copper contact 11, the ceramic 12 and the Kovac frame piece 13 cannot move relatively, so that when brazing subsequently, the welding quality is high, the sealing property of the ceramic cavity is guaranteed, and the product yield is improved.

[0043] The technical features of the above-described embodiments can be combined arbitrarily, in order to make the description simple, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that it is within the scope of the description.

[0044] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled persons in the art, on the premise of not departing from the utility model concept, a number of deformations and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A high-voltage DC relay brazing jig, characterized by, The utility model relates to a high -voltage direct current relay brazing jig for ceramic assembly (1), ceramic assembly (1) includes copper contact (11), ceramic (12) and can frame piece (13), the top of can frame piece (13) is equipped with square solder piece (14), the top of can frame piece (13) is clamped in the bottom of ceramic (12), square solder piece (14) is located between the top of can frame piece (13) and the bottom of ceramic (12), the top of ceramic (12) is equipped with two round solder piece (15), the bottom of copper contact (11) is clamped in the mounting hole of the top of ceramic (12), and round solder piece (15) is located between the top of ceramic (12) and copper contact (11), and the high -voltage direct current relay brazing jig includes: The bottom of the inside of base (2) clamps can frame piece (13); The inner wall of upper cover (3) clamps the lateral wall of ceramic (12) and the two copper contact (11) of the top of ceramic (12), and the round solder piece (15) is clamped between the top of ceramic (12) and copper contact (11), and upper cover (3) is pressed in the inside of base (2) and the lateral wall of upper cover (3) clamps the inner wall of base (2); Positioning mechanism is arranged at the bottom of the inside of base (2) and clamps the inside of square solder piece (14), and the circumferential movement of square solder piece (14) is limited.

2. The high-voltage DC relay brazing jig of claim 1, wherein: The positioning mechanism includes at least two positioning pins (4) abutting the front end of the inside of can frame piece (13), at least two positioning pins (4) abutting the rear end of the inside of can frame piece (13), limiting the front and rear movement and rotation of can frame piece (13), and at least one positioning pin (4) abutting the left and right ends of the inside of can frame piece (13) respectively, limiting the left and right movement of can frame piece (13).

3. The high-voltage DC relay brazing fixture of claim 2, wherein: The positioning pin (4) includes a conical portion (41) and a rod portion (42), the bottom end of the conical portion (41) is connected to the top end of the rod portion (42), the bottom end of the rod portion (42) is connected to the bottom of the inside of the base (2), and the conical portion (41) extends out of the can frame piece (13) and clamps the inside of the square solder piece (14).

4. The high-voltage DC relay brazing fixture of claim 3, wherein: The positioning pin (4) has six, the bottom of the inside of the base (2) is provided with six holes (21) along the inner frame of the can frame piece (13), and the bottom of the rod portion (42) is interference fit in the hole (21).

5. The high-voltage DC relay brazing fixture of claim 1, wherein: The high -voltage direct current relay brazing jig further includes two counterweights (5), and the two counterweights (5) are clamped on the top of the upper cover (3) and supported on the top of the two copper contact (11).

6. The high-voltage DC relay brazing fixture of claim 5, wherein: The top of the upper cover (3) is provided with two first grooves (31) at intervals, the positions of the two first grooves (31) correspond to the top of the two copper contact (11) respectively, the shape of the first groove (31) corresponds to the shape of the counterweight (5), and the counterweight (5) is clamped in the first groove (31).

7. The high-voltage DC relay brazing fixture of claim 1, wherein: The bottom end of the upper cover (3) is provided with a second groove body, the shape of the second groove body corresponds to the outer side of the ceramic (12), the groove top of the second groove body is further provided with two third groove bodies, the shape of the third groove body corresponds to the shape of the top end of the copper contact (11) and corresponds to the copper contact (11), the top end of the copper contact (11) is clamped in the third groove body, and the side wall of the ceramic (12) is clamped in the second groove body.

8. The high-voltage DC relay brazing fixture of claim 1, wherein: The top end of the base (2) is further provided with a fourth groove body (22), the shape of the fourth groove body (22) corresponds to the shape of the outer side of the upper cover (3), and the outer side of the upper cover (3) is clamped in the fourth groove body (22).

9. The high-voltage DC relay brazing fixture of claim 8, wherein: The groove bottom of the fourth groove body (22) is further provided with a fifth groove body (23), the shape of the fifth groove body (23) corresponds to the shape of the outer side of the Kovar frame sheet (13), the outer side of the Kovar frame sheet (13) is clamped in the fifth groove body (23), and the positioning mechanism is arranged on the groove bottom of the fifth groove body (23).

10. The high-voltage DC relay brazing fixture of claim 1, wherein: The upper cover (3) and the base (2) are made of a material with a small coefficient of thermal expansion.

Images