A dry reed relay movement and a dry reed relay

Abstract

This invention discloses a reed relay mechanism, comprising a coil frame, a reed switch, and two reed lead frames. The reed switch is disposed in the central hole of the coil frame, and two reed leads of the reed switch extend from both ends of the coil frame. A coil is wound on the coil frame. Each reed lead frame has a connecting part and a lead. The connecting parts of the two reed lead frames are respectively welded to the two reed leads. At least one reed lead frame has a connecting groove in its connecting part. The connecting groove contacts one of the reed leads through two opposing limiting surfaces and restricts the radial displacement of the reed lead along the coil. Then, the connecting part of the reed lead frame is welded to the reed lead. This invention also discloses a reed relay equipped with the above mechanism. This invention improves the positioning accuracy during the assembly of the reed lead frames and the reed leads, facilitates the formation of electrical connections through laser welding, and ensures the quality of the reed relay.

Description

Technical Field

[0001] This invention relates to the field of reed relay manufacturing technology, and in particular to a reed relay mechanism and a reed relay. Background Technology

[0002] Reed relays are derivatives of reed switch technology, primarily composed of a reed switch and an excitation coil. The reed (contact) is sealed in a glass tube filled with inert gases such as nitrogen, and is typically made of an iron-nickel alloy. The contact portion of the reed is usually plated with precious metals (such as gold, rhodium, palladium, etc.), ensuring good contact and excellent conductivity. Because the contacts are sealed in a glass tube filled with inert gases such as nitrogen, dust contamination is effectively prevented, contact corrosion is reduced, and operational reliability is improved. Reed relays have gained widespread recognition and application in fields requiring high insulation and high contact reliability (such as instrument testing, network communication, new energy insulation detection, and medical electronics). Currently, reed relays are also being miniaturized to meet the needs of more applications.

[0003] To ensure proper mating between the reed relay pins and the circuit board, existing reed relays often require an additional lead frame to connect the reed switch pins and the two ends of the excitation coil. Most reed switch pins are cylindrical, and the connection between the lead frame and the pins is achieved through soldering. Traditionally, the reed switch pins and the lead frame support are in a curved-plane contact, with the contact area being a straight line. The lead frame support surface is flat. Thus, the reed switch pins are only subjected to a downward vertical force G and a supporting force N of the same magnitude but opposite direction; they are not subjected to forces in the lateral direction. During the transfer from the electromagnetic assembly process to the subsequent welding process, the production line is subject to force interference in the direction of material transport due to inertia at the moment of start and stop of the transfer. Since there is no force in the left and right directions, when this force exceeds the maximum static friction force on the electromagnetic part, it will cause the reed switch lead to slide or roll and generate displacement, resulting in instability and poor positioning accuracy after assembly. This, in turn, leads to welding problems that affect the reliability of electrical connections and the large stress generated during welding that may damage the reed switch's sealing performance.

[0004] The aforementioned problems will limit the selection of welding processes to those with relatively low positioning accuracy requirements, such as tin soldering. However, tin soldering is prone to producing dross during the welding process. Since the surface of the enameled wire of the electromagnetic coil is exposed during the welding process, and the temperature of the dross is much higher than the temperature resistance of the enameled wire coating, if the dross splashes onto the surface of the enameled wire, it will damage the coating, causing short circuits between the turns of the contacting enameled wires, which will cause the relay to fail and may result in scrap. Secondly, the tin soldering process is less efficient and will also affect the overall production cycle and production efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a reed relay mechanism that improves the positioning accuracy of the reed lead frame and the reed lead pin of the reed tube during assembly, facilitates the formation of electrical connection by laser welding, and ensures the quality of the reed relay.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a reed relay core, comprising a coil frame and a reed switch, the reed switch being disposed in the central hole of the coil frame, two reed leads of the reed switch extending from both ends of the coil frame, a coil being wound on the coil frame, and further comprising two reed lead frames, each reed lead frame having a connecting part and a lead, the connecting parts of the two reed lead frames being welded to the two reed leads respectively, so that the two reed lead frames are electrically connected to the two reed leads respectively; at least one reed lead frame has a connecting groove in its connecting part, the connecting groove contacting one of the reed leads through two opposing limiting surfaces and restricting the reed lead from radially displacing along the coil, and then the connecting part of the reed lead frame is welded to the reed lead.

[0007] A further improvement involves connecting the two reed lead frames with a removable connecting material. This ensures accurate positioning of the two reed lead frames before welding and facilitates assembly.

[0008] Further improvements include connecting grooves on the connecting portions of both reed switch lead frames. The two reed switch lead frames are designated as a first reed switch lead frame and a second reed switch lead frame. The first reed switch lead frame has a first connecting portion and a first lead-out foot, with a first connecting groove on the first connecting portion. The second reed switch lead frame has a second connecting portion and a second lead-out foot, with a second connecting groove on the second connecting portion. The first connecting groove contacts one of the reed switch lead-out feet via two opposing limiting surfaces, and the second connecting groove also contacts the other reed switch lead-out foot via two opposing limiting surfaces. The first and second connecting grooves together restrict the radial displacement of the coil frame and reed switch along the coil before the reed switch lead frame connecting portion is welded to the reed switch lead-out foot. This further enhances the positioning of the two reed switch lead-out feet before welding, ensuring that the reed switch and electromagnetic components do not shift relative to the reed switch lead frame during assembly on the production line.

[0009] A further improvement involves a positioning structure between the first reed lead frame and the coil frame, which restricts their relative displacement. This further enhances the positioning accuracy between the reed lead frame and the electromagnetic component.

[0010] Preferably, the positioning structure includes two mating grooves disposed on the coil frame, the first connecting part and the first lead-out foot of the first tongue reed lead frame are connected and formed as one unit through the first transition part, and the first transition part extends outward at intervals with two positioning parts, each positioning part mating with one of the mating grooves.

[0011] Preferably, the first connecting groove is formed by bending or cutting the first connecting portion.

[0012] Preferably, the cross-section of the first connecting groove is V-shaped, U-shaped, or arc-shaped; the cross-section of the second connecting groove is arc-shaped, V-shaped, or U-shaped.

[0013] Furthermore, when the cross-section of the first connecting groove is an arc or a semi-circle, the two opposing limiting surfaces of the first connecting groove are connected to form a surface; when the cross-section of the second connecting groove is an arc or a semi-circle, the two opposing limiting surfaces of the second connecting groove are connected to form a surface.

[0014] As an improvement, the second connecting part and the second lead-out foot on the second tongue spring lead frame are connected and formed as one piece through the second transition part. The second connecting groove is formed by punching the second connecting part. The second connecting part and the second lead-out foot are perpendicular by bending the second transition part. A clearance notch is also provided on the second connecting part on one side of the second connecting groove.

[0015] The bending of the second transition section can reduce the axial length of the reed relay core after assembly, or increase the axial dimension of the coil frame while keeping the total length of the reed relay core unchanged. When the axial dimension of the coil frame increases, the winding window length space of the coil frame increases, thus allowing for a smaller outer diameter and longer length of the wound coil while keeping the technical parameters of the reed relay core and the coil ampere-turns unchanged. The maximum thickness dimension of this reed relay core is determined by the outer diameter of the coil, so after the core is manufactured into a reed relay through subsequent processes, the thickness of the reed relay is reduced, thereby reducing the size of the reed relay.

[0016] On the other hand, if the original external dimensions of the reed relay mechanism are maintained, increasing the axial dimension of the coil frame allows for a longer reed switch to be accommodated in the center hole, resulting in a higher coil ampere-turn count. With the same AT value for the reed switch, a higher coil ampere-turn count provides a greater margin for operating voltage at high temperatures. Furthermore, a larger coil ampere-turn count allows for better control of electrical parameters during production, improving product yield and reducing scrap costs. Therefore, it also enhances the performance of the reed relay, enabling it to meet the diverse load requirements of more customers.

[0017] Secondly, it reduces stress issues after welding. This improved structure, during the stamping of the reed switch lead frame, forms a connecting groove according to the reed switch lead size. Then, a 90° bend is made through the second transition section to create a recessed space, ensuring the electromagnetic component remains relatively centered in the thickness direction of the reed relay core. Furthermore, the opening of the second connecting groove is bent vertically upwards, becoming a support surface for the reed switch lead. Therefore, the connecting groove can contact the arc surface of the reed switch lead through two opposing limiting surfaces, and the contact area is surface contact, allowing for a tight and reliable connection. This provides excellent support and limiting effects, avoiding additional stress after welding and better protecting the seal of the reed switch glass tube.

[0018] Furthermore, a clearance notch is provided on the second connecting part on one side of the second connecting groove, which can prevent the material near the bending line from tearing after bending due to the material being too close to the bending line, and effectively reduce the problem of the support surface deforming after bending due to being too close to the bending line.

[0019] As another improvement, the second connecting portion and the second lead-out foot on the second tongue spring lead frame are connected and formed integrally by a second transition portion, and the second connecting groove is formed by bending the second connecting portion. This facilitates processing.

[0020] Preferably, the first lead and the second lead are parallel to each other, and the first lead and the second lead are connected by a removable connector. This facilitates processing and mating with external circuit boards.

[0021] The reed relay mechanism of this invention, through the contact of two opposing limiting surfaces of the connecting groove with one of the reed leads and restricting the radial displacement of the reed lead along the coil, and then the reed lead frame connecting part is welded to the reed lead. Firstly, this improves the positioning accuracy between the reed lead and the reed lead frame, ensuring that the connecting groove, through the constraint of the two opposing limiting surfaces, prevents the reed lead from sliding or rolling during assembly, thus avoiding instability and poor positioning accuracy after assembly, which could lead to welding problems affecting the reliability of the electrical connection. Secondly, since the connecting groove directly contacts one of the reed leads through the two opposing limiting surfaces, it facilitates laser welding. By improving positioning accuracy and using laser welding to form the electrical connection, the stress generated during welding is minimized, thus avoiding damage to the reed's sealing performance. This effectively ensures the quality of the reed relay, improves production efficiency, increases the pass rate during production assembly, reduces product scrap due to assembly defects, and lowers production costs.

[0022] This invention also discloses a reed relay, including a housing and the aforementioned reed relay mechanism. The reed relay mechanism is mounted inside the housing and is fixedly connected to the housing. Leads on both reed lead frames partially extend outside the housing. The two ends of the reed relay mechanism coil are electrically connected to two coil lead frames, each with a coil lead extending partially outside the housing. The housing is fixedly connected to the reed relay mechanism via injection molding; alternatively, the reed relay mechanism is mounted inside the housing and fixedly connected via an insulating and sealing material. This relay ensures good quality and facilitates miniaturization. Attached Figure Description

[0023] Figure 1 This is a perspective view of the first embodiment of the reed relay mechanism of the present invention;

[0024] Figure 2 This is a front view of the first embodiment of the reed relay mechanism of the present invention;

[0025] Figure 3 This is a schematic diagram of the separated parts of the reed relay mechanism of the present invention in the first embodiment;

[0026] Figure 4 yes Figure 3 AA section view;

[0027] Figure 5 This is a front view of the second transition section of the second reed lead frame in the first embodiment of the reed relay mechanism of the present invention before bending;

[0028] Figure 6 yes Figure 1 Enlarged view of point B;

[0029] Figure 7 yes Figure 2 C-direction partial view;

[0030] Figure 8 This is a schematic diagram of the first embodiment of the reed relay mechanism of the present invention, showing all the lead frames connected to a removable connecting material;

[0031] Figure 9 This is a perspective view of a reed relay equipped with the reed relay mechanism of the first embodiment of the present invention;

[0032] Figure 10 This is a partial front view of the second embodiment of the reed relay mechanism of the present invention;

[0033] Figure 11 yes Figure 10 A partial 3D view of point D. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0035] Example 1 Figures 1 to 8 As shown, a reed relay mechanism includes a coil frame 1 and a reed switch 2. The reed switch 2 is disposed in the central hole of the coil frame 1. Two reed leads 21 of the reed switch 2 extend from both ends of the coil frame 1. A coil 3 is wound on the coil frame 1. The reed switch 2 can be integrally injection molded with the coil frame 1, or the reed switch 2 can be fixedly connected to the coil frame 1 by sealant.

[0036] This embodiment also includes two reed lead frames 4, two coil lead frames 5, and a diode 6. The two ends of the diode 6 are electrically connected to the two coil lead frames 5 by welding. The two reed lead frames 4 are made of conductive metal material. The two reed lead frames 4 are a first reed lead frame 41 and a second reed lead frame 42. The first reed lead frame 41 is provided with a first connecting part 411 and a first lead-out foot 412. The first connecting part 411 and the first lead-out foot 412 of the first reed lead frame 41 are connected by a first transition part 413 and form an integral part. The first connecting part 411 is provided with a first connecting groove 4a. The first connecting groove 4a is formed by bending the first connecting part 411 or by cutting. The first connecting groove 4a is provided with two opposing limiting surfaces 41a. The cross-section of the first connecting groove 4a is preferably V-shaped, but it can also be U-shaped or arc-shaped. When the cross-section of the first connecting groove 4a is arc-shaped and is an arc or semi-circle, the two opposing limiting surfaces 41a of the first connecting groove 4a are connected to form a surface.

[0037] The second reed lead frame 42 is provided with a second connecting part 421 and a second lead-out foot 422. The second connecting part 421 and the second lead-out foot 422 on the second reed lead frame 42 are connected by a second transition part 423 and form an integral part. The second connecting part 421 is provided with a second connecting groove 4b. The second connecting groove 4b is provided with two opposing limiting surfaces 41b. The cross-section of the second connecting groove 4b is preferably arc-shaped, but it can also be V-shaped or U-shaped. When the cross-section of the second connecting groove 4b is arc-shaped and is an arc or a semi-circle, the two opposing limiting surfaces 41b of the second connecting groove 4b are connected to form a surface.

[0038] The second connecting groove 4b is formed by punching the second connecting part 421, and the second connecting part 421 and the second lead-out foot 422 are perpendicular by bending the second transition part 423; a clearance notch 4c is also provided on the second connecting part 421 on one side of the second connecting groove 4b.

[0039] A positioning structure is provided between the first reed lead frame 41 and the coil skeleton 1 to restrict the mutual displacement of the first reed lead frame 41 and the coil skeleton 1. The positioning structure includes two mating grooves 11 provided on the coil skeleton 1. The first transition part 413 extends outward at intervals with two positioning parts 4d, and each positioning part 4d is mated with one of the mating grooves 11.

[0040] The first connecting groove 4a contacts one of the reed switch leads 21 via two opposing limiting surfaces 41a, and the second connecting groove 4b also contacts another reed switch lead 21 via two opposing limiting surfaces 41b. The first connecting groove 4a and the second connecting groove 4b together restrict the radial displacement of the coil frame 1 and the reed switch 2 along the coil 3. Then, the first connecting part 411 on the first reed switch lead frame 41 forms a stable electrical connection with one of the reed switch leads 21 through laser welding. Similarly, the second connecting part 421 on the second reed switch lead frame 42 forms a stable electrical connection with another reed switch lead 21 through laser welding. Because laser welding can be used, the influence of weld slag on other parts is avoided, further improving welding reliability. It also reduces the impact of welding stress on the reed switch's sealing performance, thus improving the quality of the movement.

[0041] The two coil lead frames 5 include a first coil lead frame 51 and a second coil lead frame 52. The two coil lead frames 5 are made of a conductive metal material. The first coil lead frame 51 includes a third connecting part 511 and a third lead 512. The second coil lead frame 52 includes a fourth connecting part 521 and a fourth lead 522. Two coil conductive terminals 12 are injection molded and fixed on the coil frame 1. One end of each coil conductive terminal 12 is electrically connected to the two ends of the enameled wire of the coil 3. The third connecting part 511 is electrically connected to one coil conductive terminal 12 by welding, and the fourth connecting part 521 is electrically connected to the other coil conductive terminal 12 by welding. The two ends of the diode 6 are electrically connected to the third connecting part 511 and the fourth connecting part 521, respectively.

[0042] The first lead-out pin 412, the second lead-out pin 422, the third lead-out pin 512 and the fourth lead-out pin 522 are parallel to each other; Figure 8 As further shown, the first lead 412, the second lead 422, the third lead 512, and the fourth lead 522 are connected by a removable connector 10 before soldering, and can be connected along the [connector] after soldering. Figure 8 Cut the material at the dotted line position to remove 10g of connecting material.

[0043] Combination Figure 1 , Figure 9As shown, a reed relay includes a housing 20 and the reed relay mechanism of the above embodiment 1. The reed relay mechanism is installed inside the housing 20 and is fixedly connected to the housing 20. The leads on the two reed lead frames 4, namely the first lead 412 and the second lead 422, partially extend out of the housing 20. The two ends of the reed relay mechanism coil 3 are electrically connected to two coil lead frames 5 respectively. Each of the two coil lead frames 5 has a coil lead. The two coil leads, namely the third lead 512 and the fourth lead 522, partially extend out of the housing 20. In this embodiment, the housing 20 is fixedly connected to the reed relay mechanism by injection molding.

[0044] Another way to connect the reed relay core and the housing 20 is as follows: the housing 20 is first injection molded, and then the reed relay core of this embodiment is installed into the housing 20 and fixed by an insulating and sealing material, which can be epoxy resin.

[0045] Example 2 Figure 10 , Figure 11 As shown, a reed relay mechanism differs from Embodiment 1 in that the structure of the second reed lead frame 42 is different. The second connecting groove 4b is formed by bending the second connecting part 421, and the cross-section of the second connecting groove 4b is V-shaped.

[0046] The second connecting groove 4b contacts the other tongue reed lead 21 through two opposing limiting surfaces 41b and then is electrically connected by laser welding.

[0047] This embodiment can also be connected to the housing to form a reed relay, and the connection method is the same as that in the embodiment.

[0048] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A reed relay mechanism, comprising a coil frame and a reed switch, wherein the reed switch is disposed in the center hole of the coil frame, and two reed leads of the reed switch extend from both ends of the coil frame, and a coil is wound on the coil frame, characterized in that: It also includes two reed lead frames, each with a connecting part and a lead-out foot. The connecting parts of the two reed lead frames are respectively welded to two reed lead-out feet, so that the two reed lead frames are electrically connected to the two reed lead-out feet respectively. At least one reed lead frame has a connecting groove in its connecting part. The connecting groove contacts one of the reed lead-out feet through two opposing limiting surfaces and restricts the reed lead-out foot from moving radially along the coil. Then the connecting part of the reed lead frame is welded to the reed lead-out foot. Both tongue reed lead frames have a connecting groove on their connecting parts. The two tongue reed lead frames are a first tongue reed lead frame and a second tongue reed lead frame. The first tongue reed lead frame has a first connecting part and a first lead-out foot, and the first connecting part has a first connecting groove. The second tongue reed lead frame has a second connecting part and a second lead-out foot, and the second connecting part has a second connecting groove. The second connecting part and the second lead on the second tongue reed lead frame are connected and formed as one unit through the second transition part, and the second connecting part and the second lead are made perpendicular by bending the second transition part; The first lead and the second lead are parallel to each other and are parallel to the axis of the coil.

2. The reed relay mechanism according to claim 1, characterized in that: The two reed lead frames are connected by a removable connecting material.

3. A reed relay mechanism according to claim 1 or 2, characterized in that: The first connecting groove contacts one of the reed leads through two opposing limiting surfaces, and the second connecting groove also contacts the other reed lead through two opposing limiting surfaces. The first and second connecting grooves together restrict the coil frame and reed switch from shifting radially along the coil before the reed lead frame connection is welded to the reed lead.

4. The reed relay mechanism according to claim 3, characterized in that: A positioning structure is provided between the first reed lead frame and the coil skeleton to restrict the mutual displacement of the first reed lead frame and the coil skeleton.

5. A reed relay mechanism according to claim 4, characterized in that: The positioning structure includes two mating slots on the coil frame. The first connecting part and the first lead-out foot of the first tongue reed lead frame are connected and formed as one unit through the first transition part. The first transition part extends outward at intervals with two positioning parts, each positioning part mating with one of the mating slots.

6. A reed relay mechanism according to claim 3, characterized in that: The first connecting groove is formed by bending or cutting the first connecting portion.

7. A reed relay mechanism according to claim 3, characterized in that: The cross-section of the first connecting groove is V-shaped, U-shaped, or arc-shaped; the cross-section of the second connecting groove is arc-shaped, V-shaped, or U-shaped.

8. A reed relay mechanism according to claim 3, characterized in that: The second connecting groove is formed by punching the second connecting part, and a clearance notch is also provided on the second connecting part on one side of the second connecting groove.

9. A reed relay mechanism according to claim 3, characterized in that: The second connecting groove is formed by bending the second connecting portion.

10. A reed relay mechanism according to claim 3, characterized in that: The first lead and the second lead are connected by a removable connecting material.

11. A reed relay, comprising a housing, characterized in that: It also includes the reed relay mechanism as described in any one of claims 1-10, wherein the reed relay mechanism is installed inside the housing and is fixedly connected to the housing, and the leads on the two reed lead frames partially extend out of the housing, and the two ends of the reed relay mechanism coil are electrically connected to the two coil lead frames respectively, each of the two coil lead frames having a coil lead, and both coil leads partially extending out of the housing; the housing is fixedly connected to the reed relay mechanism by injection molding; or the reed relay mechanism is installed in the housing and fixedly connected by insulating and sealing material.

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