Magnetic latching relay base

Abstract

The invention discloses a magnetic latching relay base which is configured and assembled on a 1 / 5 cubic inch balance force type magnetic latching relay, and a connecting piece (22) of a base contact part and a contact piece (4) serving as a conductive transition part of a movable contact spring part and a load leading-out end (5) are fixed through a brazing clamp and are subjected to laser brazing with the load leading-out end (5). The base connecting piece and the movable contact spring are electrically connected with the load leading-out end through laser brazing, the problem that welding flux splashes seriously is effectively solved, it is guaranteed that the welding position is attractive, the welding quality is high, the consistency is good, the welding area is large, the resistance value is small, and the welding efficiency is high.

Description

Technical Field

[0001] The invention belongs to the technical field of manufacturing military electromagnetic relays, and mainly relates to a magnetic latching relay base, which is configured to be assembled on a 1 / 5 cubic inch balanced force type magnetic latching relay. Background Art

[0002] The contact system belongs to the output actuator of the electromagnetic relay. The base is an important part of the contact system, which is related to the load resistance and sealing of the relay. The conductive parts of the traditional balanced force relay base are usually connected by spot welding. When the volume space and the size of the parts of the relay are small enough, the design and manufacturing of the spot welding fixture and the positioning requirements of the size tolerance of the welding parts are extremely high. The spot welding method is not only inefficient and difficult, but also the welding quality cannot be guaranteed. Summary of the invention

[0003] The purpose of the present invention is to provide a magnetic latching relay base to solve the problem that the fixture design is difficult when spot welding is used for an ultra-small balanced force type relay base.

[0004] The base is configured to be assembled on a 1 / 5 cubic inch balanced force magnetic latching relay, and the connecting piece of the base contact part and the contact piece as the conductive transition part between the movable spring part and the load lead-out terminal are fixed with the load lead-out terminal by a brazing fixture and laser brazed;

[0005] The brazing fixture comprises a positioning block, a positioning insert I, a positioning insert II, a positioning insert III, a compression screw, a spring and a locking nut; the positioning block is formed with mounting holes for base assembly, and the positioning insert I, the positioning insert II and the positioning insert III are respectively assembled on the positioning block to position the connecting piece and the contact piece respectively;

[0006] The compression screw, the spring and the locking nut are used to adjust the tightness of the positioning insert I, the positioning insert II and the positioning insert III.

[0007] In some embodiments, the welding areas formed between the connection sheet and the contact sheet and the load lead-out terminal respectively make the contact resistance value less than or equal to 30 mΩ.

[0008] In some embodiments, at least two mounting holes are formed on the positioning block for assembling the base plate, thereby realizing multiple-piece welding of the upper mold at one time, i.e., satisfying the positioning of multiple bases and welded parts, and the welding parameters are also the same, thereby ensuring the consistency of multiple bases.

[0009] In some embodiments, the base includes a bottom plate, a contact portion, and a coil lead-out terminal; the contact of the contact portion is formed on the connecting piece, and the contact piece is sleeved on the periphery of the load lead-out terminal and is electrically connected to the load lead-out terminal.

[0010] In some implementations, the bottom plate is connected to the coil lead-out terminal and the load lead-out terminal respectively through glass sintering, thereby ensuring insulation between the two.

[0011] The beneficial effects of the present invention include at least:

[0012] 1) The base connecting piece and the moving spring piece are electrically connected to the load lead-out terminal through laser brazing, which effectively solves the problem of serious solder spatter, ensures the beauty of the welding part, high welding quality, good consistency, large welding area, small resistance value, high welding efficiency, etc.

[0013] 2) This base only needs one pair of positioning fixtures to meet the positioning of multiple parts to be welded. The welding parameters are also the same, which ensures the consistency of welding and allows multiple parts to be welded at one time.

[0014] 3) Meet the requirement of ultra-small relay contact resistance ≤30mΩ and pass high temperature life test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings herein are incorporated into and constitute a part of the specification, showing embodiments consistent with the present invention, and together with the specification, are used to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0016] Figure 1 A schematic diagram of the overall structure of the base provided by the present invention;

[0017] Figure 2 for Figure 1 Schematic diagram of the contact part in FIG.

[0018] Figure 3 for Figure 1 A cross-sectional view of the contact piece in FIG.

[0019] Figure 4 Schematic diagram of solder used for welding;

[0020] Figure 5 Place a cutaway view for the disk-shaped solder;

[0021] Figure 6 This is a schematic diagram of solder filling after laser brazing. The black area is the filling area.

[0022] Figure 7 The structure of the brazing fixture described in the present invention is shown in FIG. Figure 1 ;

[0023] Figure 8 The structure of the brazing fixture described in the present invention is shown in FIG. Figure 2 ;

[0024] Fig. 9 is a schematic diagram of a base being located in a brazing fixture;

[0025] Fig.10 A schematic diagram of a partial structure of a relay described in the present invention;

[0026] Explanation of the accompanying drawings: 1-base plate, 2-contact part, 3-coil lead-out terminal, 4-contact piece, 5-load lead-out terminal, 21-contact, 22-connecting piece, 6-solder, 7-positioning plug I, 8-positioning block, 9-positioning plug II, 10-positioning plug III, 11-tension screw, 12-spring, 13-locking nut. DETAILED DESCRIPTION

[0027] The technical solution claimed for protection by the patent of the present invention is further described in detail here with reference to the accompanying drawings and specific implementation methods.

[0028] Combination Figure 1-9 The base described in the present invention is configured for use in a 1 / 5 cubic inch balanced force magnetic latching relay, which has two sets of switching contacts and a length and width of 20.5max×10.5max. The base mainly includes a base plate 1, a contact part 2, a coil lead-out terminal 3 electrically connected to the coil in the relay electromagnetic system, a contact piece 4 as a conductive transition part between the moving reed part and the load lead-out terminal 5, and a load lead-out terminal 5, wherein the base plate 1 is connected to the load lead-out terminal 5 and the coil lead-out terminal 3 by glass sintering to form a base assembly to ensure the sealing and insulation performance of the product.

[0029] The contact portion 2 includes a connecting piece 22 and a contact 21 formed on the connecting piece 22. The connecting piece 22 and the contact piece 4 are fixed to the load lead terminal 5 by a brazing fixture and laser brazed.

[0030] In the present disclosure, the assembly holes of the connecting piece 22, the contact piece 4 and the load lead-out terminal 5 are pre-drilled with small holes during the production of the parts and then expanded by pulling down to meet the design size requirements, so as to ensure a sufficiently large welding area and make the welding more firm.

[0031] The materials of the connecting piece 22 and the contact piece 4 are both silver-magnesium alloy strips with high electrical and thermal conductivity, which not only ensures electrical conductivity but also achieves thermal conductivity.

[0032] Combination Figure 7-9The base is assembled on the brazing fixture to realize the welding and positioning between the connecting piece 22, the contact piece 4 and the load lead-out terminal 5, and then laser brazing is performed to realize the welding of the base with the connecting piece 22 and the contact piece 4, which has the characteristics of high precision, no spatter, no pollution, good welding effect, high reliability, etc. The brazing fixture is configured to include a positioning block 8, a positioning insert I7, a positioning insert II9, a positioning insert III10, a clamping screw 11, a spring 12 and a locking nut 13; the positioning block 8 is formed with mounting holes for the base assembly, and the positioning insert I7, the positioning insert II9 and the positioning insert III10 are respectively assembled on the positioning block 8 for positioning the connecting piece 22 and the contact piece 4 respectively.

[0033] The positioning plug I7, positioning plug II9, and positioning plug III10 control the elastic force by loosening and tightening the locking nut 13 on the compression screw 11 to adjust the expansion and contraction amount of the spring 12, thereby achieving the purpose of controlling the tightness of the positioning plugs, realizing the positioning of the connecting piece and the contact piece, and ensuring effective contact with the load lead-out terminal 5. After brazing, the connecting piece 22 and the load lead-out terminal 5, the contact piece 4 and the load lead-out terminal 5 are effectively electrically connected to avoid the occurrence of cold soldering.

[0034] Combination Figures 5 to 9 , install the base assembly into the brazing fixture positioning block 8, install the corresponding contact part 2 and contact piece 4 into the corresponding load lead-out terminal 5 according to the design requirements, push the positioning plug I7 and the positioning plug III 10 to position the contact part 2, push the positioning plug II 9 on both sides to position the contact piece 4, and adjust the tightness of the positioning plug by twisting the nut 13 to control the expansion and contraction of the spring 12 according to the actual situation; put the special solder 6 into the component welding part (between the connecting piece 22 and the load lead-out terminal 5, and between the contact piece 4 and the load lead-out terminal 5), and finally put the fixture as a whole into the laser workbench, adjust the welding parameters and weld all the components in the fixture in turn; a positioning fixture is realized, which can meet the positioning of multiple welded parts, and the welding parameters are also the same, and multiple pieces can be welded at one time, ensuring the consistency of welding.

[0035] In the present disclosure, the solder 6 is made of silver-copper alloy with low resistivity; the solder wets a circle (360°) around the lead-out terminal, the welding area is large, and the resistance value between the welded parts is small; for the relay, the welding part is a conductive part, so the contact resistance can be reduced, and the resistance value can be calculated by the formula ρ is the material resistivity, l is the length along the current direction, the larger S (welding area) is, the smaller R (resistance value) is.

[0036] The base can meet the requirement of relay contact resistance ≤ 30mΩ and pass the high temperature life test; after being assembled into a relay, it is guaranteed that the relay passes the high temperature life test.

[0037] The brazing fixture disclosed in the present invention may provide only one base mounting hole position, or the brazing fixture mounting hole positions may be expanded to a plurality of mounting positions, thereby achieving one-time mold placement and multiple-piece welding.

[0038] When designing the spot welding fixture for the relay base, not only the positioning accuracy of the parts and components must be considered, but also the positioning of the parts and components must not cause shunting to the welded parts. For the welding of a 1 / 5 cubic inch base, the product volume is relatively small. If the traditional spot welding method is used, the welded parts (contact sheets, contact parts) are too close to the base plate. The upper electrode design and production control dimensions must not only be small, but also have to be very precise. During the actual welding process of the parts, the upper electrode must not touch the base plate or the welded parts. This places very high demands on the welding operator, makes control difficult, and results in poor consistency in the quality of parts welding. This base uses laser brazing, so there is no need to consider fixture design to avoid shunting, as well as welding electrode design and manufacturing issues.

[0039] This base is used for a 1 / 5 cubic inch balanced force magnetic latching relay, and the base is welded by laser brazing, which solves the problems of severe solder spatter, short circuit risk, and unsightly welding parts caused by pewter welding; solves the problems of obvious weld marks, poor morphology, and discoloration of parts caused by laser fusion welding; and solves the problems of contact piece 4 and contact part 2 requiring separate spot welding processes in two steps, poor welding quality, great welding difficulty, and low efficiency.

[0040] Fig.10 A partial portion of the relay obtained by assembling the base and the electromagnetic system is shown, in which the movable spring piece part of the electromagnetic system is electrically connected to the contact piece 4 through the contact spring.

[0041] The above embodiments are only used to illustrate the technical solution of the patent of the present invention rather than to limit it. Any modification or equivalent substitution made to the technical solution of the patent of the present invention by ordinary technicians in this field shall be included in the scope of the claims of the present invention as long as it does not depart from the spirit and scope of the technical solution of the patent of the present invention.

Claims

1. A magnetic latching relay base, characterized in that: The base is configured to be assembled on a 1 / 5 cubic inch balanced force magnetic latching relay, and the connecting piece (22) of the contact part of the base and the contact piece (4) as a conductive transition part between the movable spring piece and the load lead end (5) are fixed to the load lead end (5) by a brazing fixture and laser brazed; The brazing fixture comprises a positioning block (8), a positioning insert I (7), a positioning insert II (9), a positioning insert III (10), a pressing screw (11), a spring (12) and a locking nut (13); the positioning block (8) is formed with mounting holes for base assembly; the positioning insert I (7), the positioning insert II (9) and the positioning insert III (10) are respectively assembled on the positioning block (8) for positioning the connecting piece (22) and the contact piece (4) respectively; The compression screw (11), the spring (12) and the locking nut (13) are used to adjust the tightness of the positioning insert I (7), the positioning insert II (9) and the positioning insert III (10).

2. The magnetic latching relay base according to claim 1, characterized in that: The welding areas formed between the connecting piece (22) and the contact piece (4) and the load lead-out terminal (5) respectively make the contact resistance value less than or equal to 30 mΩ.

3. The magnetic latching relay base according to claim 1, characterized in that: At least two mounting holes are formed on the positioning block (8) for assembling the base plate (1).

4. The magnetic latching relay base according to claim 1, characterized in that: The base comprises a bottom plate (1), a contact portion (2), and a coil lead-out terminal (3); the contact (21) of the contact portion (2) is formed on the connecting piece (22), and the contact piece (4) is sleeved on the outer periphery of the load lead-out terminal (5) and is electrically connected to the load lead-out terminal (5).

5. The magnetic latching relay base according to claim 4, characterized in that: The bottom plate (1) is respectively connected to the coil lead-out terminal (3) and the load lead-out terminal (5) through glass sintering.

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