High-insulation and double-shielding reed switch relay

Abstract

The utility model relates to a high-insulation and double-shielding reed switch relay. The reed pipe relay comprises a framework, a through cavity is horizontally arranged in the framework, a coil winding is wound on the outer side of the through cavity, and a reed pipe assembly is installed in the through cavity. A group of coil leading-out pins and a group of shielding leading-out pins are arranged on the framework, and the head end and the tail end of the coil winding are respectively connected with the coil leading-out pins; the reed switch assembly comprises a glass body covered with an insulating coating, a first switch element and a second switch element are arranged in the glass body, the two groups of switch elements are connected with switch leads, and the switch leads are connected with reed switch lead-out pins with tail ends suspended in the air; the outer side of the glass body is provided with a first screen and a second screen, the first screen and the second screen are respectively connected with the shielding lead-out pins on the framework, and an insulating sleeve is arranged between the first screen and the second screen. Compared with the prior art, the reed switch relay provided by the utility model has excellent insulating property and shielding effect.

Description

Technical Field

[0001] This utility model relates to the field of reed relay technology, and in particular to a high-insulation, double-shielded reed relay. Background Technology

[0002] A reed relay is an electromagnetic switching device that uses a magnetic field to switch on and off. Due to its simple structure, small size, high insulation, and reliable operation, it is widely used in various testing equipment. The core of a reed relay consists of two or more magnetic metal springs encapsulated in a glass tube filled with inert gas. Typically, such as... Figure 1 As shown, when the magnetic field generated by the current in the coil (not shown) acts on the reed switch, the switching element is magnetized and the contacts are attracted together to form a closed circuit.

[0003] To meet the low leakage current requirements in small-signal testing, insulation and shielding can reduce interference and leakage. Although the glass body of the reed switch enclosure has excellent insulation properties, environmental conditions such as air pressure, temperature, and relative humidity also affect the surface resistivity of the glass. In particular, humidity has a significant impact on the conductivity of the glass. The type, quantity, and distribution of contaminants on the glass surface also affect its surface resistivity. Existing reed relay structures typically look like this... Figure 2 As shown, the two reed switch leads and two coil leads are fixed by an insulating mounting plate and then encapsulated in an insulating housing with insulating potting compound. The surface resistivity of the insulating mounting plate and the insulating potting compound is also affected by air pressure, temperature, relative humidity, and surface contaminants, which leads to unstable insulation resistance of the reed relay.

[0004] Furthermore, existing reed relays typically use a single-layer shielding structure. For example, Figure 1 The reed switch in the example includes a single copper foil shield connected to one of the switching element leads via a jumper wire and wrapped around the entire reed switch, including the two switching element contacts. The copper foil shield is electrically connected to protect the conducted signal during testing, minimizing leakage through the contacts and their associated wires during the test. However, when... Figure 1 When the contacts in the test matrix are electrically disconnected and form part of the test matrix, leakage may occur with the wires connected through the test measurement unit, thus interfering with the measurement accuracy.

[0005] CN115954230A discloses an armored double-layer shielded reed relay and its manufacturing method. It addresses the issue of uniform impedance matching of the reed switch contacts through the inner shield and solves the problems of magnetic field leakage and low-frequency electromagnetic field shielding through the outer shield. However, the aforementioned reed relay still cannot solve problems such as insufficient insulation resistance, unstable insulation resistance, and test signal leakage due to insufficient shielding.

[0006] Therefore, in view of the problems of insufficient insulation resistance, unstable insulation resistance, and insufficient shielding leading to test signal leakage in existing reed relays, there is an urgent need to develop a new type of reed relay with high insulation and low leakage to meet the above-mentioned high-requirement application environments. Utility Model Content

[0007] The purpose of this invention is to provide a high-insulation, double-shielded reed relay to solve at least one of the problems existing in current reed relays, such as insufficient insulation resistance, unstable insulation resistance, and insufficient shielding leading to test signal leakage.

[0008] The objective of this utility model can be achieved through the following technical solutions:

[0009] This utility model provides a high-insulation, double-shielded reed relay, including a frame, a through cavity horizontally provided inside the frame, a coil winding wound around the outside of the through cavity, and a reed assembly installed inside the through cavity.

[0010] The frame is provided with a set of coil lead-out pins and a set of shield lead-out pins, and the beginning and end ends of the coil winding are respectively connected to the coil lead-out pins;

[0011] The reed switch assembly includes a glass body covered with an insulating coating, and a first switching element and a second switching element are disposed within the glass body; both the first and second switching elements are connected to switch leads, and each switch lead is connected to a reed switch lead-out foot that is suspended in the air at its end.

[0012] The outer side of the glass body is provided with a first shield corresponding to the first switching element and a second shield corresponding to the second switching element. The first shield and the second shield are respectively connected to the shield lead-out pins on the frame. An insulating sleeve is also provided between the first shield and the second shield.

[0013] Furthermore, the skeleton includes a first base and a second base, which are connected by a through cavity.

[0014] Furthermore, glue-filling grooves are provided at the connection points between the first base and the second base and the through cavity.

[0015] Furthermore, the reed switch assembly is installed at both ends of the through cavity and connected to the potting groove via insulating potting compound.

[0016] Furthermore, the first base is provided with a set of fixed pins for mounting.

[0017] Furthermore, the coil lead is located on the second base.

[0018] Furthermore, the skeleton, coil lead, and fixed pin are integrally connected.

[0019] Furthermore, both the first base and the second base are provided with shielded lead-out foot mounting grooves.

[0020] Furthermore, the shielding leads are respectively installed in the shielding lead mounting slots of the two bases and fixed by filling with insulating potting compound.

[0021] Furthermore, the coil winding is formed by uniformly winding enameled wire on the outside of the through cavity.

[0022] Furthermore, at least one loop of insulating tape is wound around the coil winding.

[0023] Furthermore, the coil winding is covered with a shielding cover.

[0024] Furthermore, the shielding cover is made of high magnetic permeability materials such as electrical pure iron and permalloy to cover the coil winding as much as possible.

[0025] Furthermore, the top of the first switching element is provided with a first contact, and the top of the second switching element is provided with a second contact.

[0026] Furthermore, the first and second contacts can be attracted together under the influence of the magnetic field of the coil winding.

[0027] Furthermore, the first shield at least partially surrounds the first switching element.

[0028] Furthermore, the second shield at least partially surrounds the second switching element.

[0029] Furthermore, both the first and second shields are made of conductive materials such as copper foil and copper extrusion layers.

[0030] Furthermore, the insulating sleeve partially covers the first shield, and the portion of the first shield not covered by the insulating sleeve is connected to the shield lead-out pin.

[0031] Furthermore, the first shield, the second shield, and the insulating sleeve are arranged substantially coaxially.

[0032] Furthermore, the gap between the insulating sleeve and the glass body is filled with insulating potting compound.

[0033] Furthermore, the insulating sleeve is made of highly insulating materials such as PTFE (polytetrafluoroethylene) and FEP (fluorinated ethylene propylene copolymer).

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) This utility model can significantly improve the overall insulation performance of the reed switch assembly by using the insulating coating on the surface of the glass body and the setting of the floating reed switch lead, overcoming the problems of insufficient insulation resistance of the reed switch relay and unstable insulation resistance due to environmental factors; secondly, the double shielding structure of the first shield and the second shield can effectively isolate electromagnetic interference, overcoming the problem of insufficient shielding of the single shielding structure of the reed switch relay leading to leakage of test signals.

[0036] (2) The present invention covers the glass surface of the reed switch assembly with an insulating coating, which can significantly improve the insulation resistance of the reed switch surface and also has excellent insulation stability under high temperature and high humidity conditions.

[0037] (3) This utility model features a double-shielded structure on the outside of the glass body of the reed switch assembly, which significantly improves the anti-interference capability and ensures reliability in complex electromagnetic environments. In addition, the insulating sleeve layer between the first and second shields enhances the electrical insulation performance, improving the safety and stability of the product.

[0038] (4) The lead of the suspended reed switch of this utility model is directly suspended in the air and does not contact any parts on the reed switch relay. This open structure has a large creepage distance and uses air with a small dielectric constant to replace the insulating material, which significantly improves the insulation performance and insulation stability of the reed switch relay. Attached Figure Description

[0039] Figure 1 This is a cross-sectional view of a conventional single-shielded reed switch assembly.

[0040] Figure 2 This is a schematic diagram of the existing conventional reed relay package structure.

[0041] Figure 3 This is a schematic diagram of the overall structure of the reed relay of this utility model.

[0042] Figure 4 This is a schematic diagram of the skeleton of this utility model.

[0043] Figure 5 for Figure 4 Sectional view of AA.

[0044] Figure 6 This is a schematic diagram of the reed switch assembly in Embodiment 4 of this utility model.

[0045] Figure 7 for Figure 6 A cross-sectional view of BB.

[0046] Explanation of markings in the diagram:

[0047] a-Contact, b-Switching element with conventional single shielding structure, c-Lead wire, d-Single layer shield, e-Jump wire, f-Reed switch lead of conventional reed relay, g-Coil lead of conventional reed relay, h-Insulating mounting plate, i-Insulating potting compound, j-Insulating housing;

[0048] 1-Frame, 11-Through cavity, 12-Coil lead, 13-Shielded lead, 14-First base, 15-Second base, 16-Potting groove, 17-Fixing pin, 18-Shielded lead mounting groove;

[0049] 2-Coil winding, 21-Insulation tape;

[0050] 3-Reed switch assembly, 31-Glass body, 311-Insulating coating, 32-First switching element, 321-First contact, 33-Second switching element, 331-Second contact, 34-Switch lead, 35-Reed switch lead, 36-First shield, 37-Second shield, 38-Insulating sleeve;

[0051] 4-Insulating potting compound;

[0052] 5-Shielding cover. Detailed Implementation

[0053] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0054] In this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0055] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0056] Example 1:

[0057] This embodiment provides a high-insulation, double-shielded reed relay. For example... Figure 3 As shown, the reed relay includes a frame 1, a through cavity 11 is horizontally provided inside the frame 1, a coil winding 2 is wound around the outside of the through cavity 11, and a reed assembly 3 is installed inside the through cavity 11.

[0058] In this embodiment, the frame 1 is provided with a set of coil lead-out pins 12 and a set of shield lead-out pins 13, and the beginning and end ends of the coil winding 2 are respectively connected to the coil lead-out pins 12.

[0059] The reed switch assembly 3 in this embodiment includes a glass body 31 covered with an insulating coating 311. A first switching element 32 and a second switching element 33 are disposed inside the glass body 31. Both the first switching element 32 and the second switching element 33 are connected to switch leads 34, and each switch lead 34 is connected to a reed switch lead-out foot 35 whose end is suspended in the air.

[0060] The outer side of the glass body 31 is provided with a first shield 36 corresponding to the first switching element 32 and a second shield 37 corresponding to the second switching element 33. The first shield 36 and the second shield 37 are respectively connected to the shield lead-out pins 13 on the frame 1. An insulating sleeve 38 is also provided between the first shield 36 and the second shield 37.

[0061] In this embodiment, an insulating coating 311 is applied to the surface of the glass body 31 of the reed switch assembly 3. Combined with the open structure of the suspended reed switch lead 35, the overall insulation performance of the reed switch assembly 3 can be significantly improved, overcoming the problems of insufficient insulation resistance of the reed switch relay and unstable insulation resistance due to environmental factors. Secondly, this embodiment effectively shields the first switching element 32 and the second switching element 33 through a double-shielded structure of the first shield 36 and the second shield 37, effectively isolating electromagnetic interference. Furthermore, the insulating sleeve 38 reduces the possibility of mutual interference, overcoming the problem of insufficient shielding in a single-shielded reed switch relay that leads to test signal leakage.

[0062] Example 2:

[0063] This embodiment provides a high-insulation, double-shielded reed relay. The reed relay includes a frame 1, a horizontally arranged through cavity 11 inside the frame 1, a coil winding 2 wound around the outside of the through cavity 11, and a reed switch assembly 3 installed inside the through cavity 11.

[0064] The difference from Example 1 is that, as Figure 4 As shown, the skeleton 1 in this embodiment includes a first base 14 and a second base 15, which are connected by a through cavity 11. A potting groove 16 is provided at the connection points of the first base 14 and the second base 15 with the through cavity 11. The reed switch assembly 3 is installed at both ends of the through cavity 11 and connected to the potting groove 16 via insulating potting material 4.

[0065] In this embodiment, the first base 14 is provided with a set of fixed pins 17 for installation, while the coil lead 12 is provided on the second base 15. The frame 1, the coil lead 12 and the fixed pins 17 are integrally connected. Both the first base 14 and the second base 15 are provided with shielded lead mounting grooves 18. The shielded leads 13 are respectively installed in the shielded lead mounting grooves 18 of the two bases and are fixed by filling with insulating potting compound 4.

[0066] Example 3:

[0067] This embodiment provides a high-insulation, double-shielded reed relay. The reed relay includes a frame 1, a horizontally arranged through cavity 11 inside the frame 1, a coil winding 2 wound around the outside of the through cavity 11, and a reed switch assembly 3 installed inside the through cavity 11.

[0068] The difference from Embodiment 1 is that the coil winding 2 in this embodiment is formed by uniformly winding enameled wire on the outside of the through cavity 11.

[0069] like Figure 5 As shown, in this embodiment, an insulating tape 21 is also wound around the coil winding 2, and a shielding cover 5 is also provided over the coil winding 2. The insulating tape 21 is wound at least once to ensure sufficient insulation strength between it and the shielding cover 5.

[0070] Example 4:

[0071] This embodiment provides a high-insulation, double-shielded reed relay. The reed relay includes a frame 1, a horizontally arranged through cavity 11 inside the frame 1, a coil winding 2 wound around the outside of the through cavity 11, and a reed switch assembly 3 installed inside the through cavity 11.

[0072] The difference from Example 1 is that, as Figure 6-7 As shown, the top of the first switching element 32 in this embodiment is provided with a first contact 321, and the top of the second switching element 33 is provided with a second contact 331. The first contact 321 and the second contact 331 can be attracted together under the magnetic field of the coil winding 2.

[0073] In this embodiment, the first shield 36 at least partially surrounds the first switching element 32, and the second shield 37 at least partially surrounds the second switching element 33. An insulating sleeve 38 partially covers the first shield 36, and the portion of the first shield 36 not covered by the insulating sleeve 38 is connected to the shield lead-out 13. The first shield 36, the second shield 37, and the insulating sleeve 38 are substantially coaxially arranged, and the gap between the insulating sleeve 38 and the glass body 31 is filled with insulating potting compound 4.

[0074] Example 5:

[0075] This embodiment provides a high-insulation, double-shielded reed relay. The reed relay specifically includes a coil assembly, a reed switch assembly 3, a shielded lead 13, a reed switch lead 35, insulating potting compound 4, and a shielding cover 5. Specifically, both the shielded lead 13 and the reed switch lead 35 are provided in twos.

[0076] The coil assembly in this embodiment includes a frame 1, a parallel through cavity 11, a shielded lead mounting slot 18, fixed pins 17, coil leads 12, a potting groove 16, a coil winding 2, and an insulating tape 21. Specifically, there are two shielded lead mounting slots 18, two fixed pins 17, two coil leads 12, and two potting grooves 16. The frame 1, the two fixed pins 17, and the two coil leads 12 are joined together by injection molding, eliminating the need for subsequent pin insertion and improving production efficiency. The two fixed pins 17 provide sufficient support for product installation, giving the reed relay stronger vibration and shock resistance. In this embodiment, the reed assembly 3 is installed symmetrically within the through cavity 11 and then fixed by filling the two potting grooves 16 on the outer wall with insulating potting material 4.

[0077] In this embodiment, enameled wire is uniformly wound on the winding shaft of the frame 1 to form a coil winding 2, and the beginning and end of the enameled wire are respectively connected to two coil lead-out feet 12. Insulating tape 21 is wrapped around the coil winding 2 at least once to ensure sufficient insulation strength between it and the shielding cover 5.

[0078] The reed switch assembly 3 in this embodiment includes a glass body 31, a first shield 36, an insulating sleeve 38, a second shield 37, a first contact 321, a second contact 331, a switching element (a first switching element 32 and a second switching element 33), an insulating coating 311, a first lead 341, a second lead 342, and an insulating potting compound 4.

[0079] In this embodiment, the surface of the glass body 31 is coated with a material containing PTFE or any other suitable high-insulation, high-temperature and high-humidity resistant material to form an insulating coating 311. The insulating coating 311 completely covers the surface of the glass body 31 and may extend to the first lead 341 and the second lead 342. The insulating coating 311 greatly improves the insulation resistance of the reed switch surface (>1000 TOhm) and has excellent insulation stability under high-temperature and high-humidity conditions.

[0080] In this embodiment, the first shield 36 at least partially surrounds the switching element supporting the first contact 321, and the second shield 37 at least partially surrounds the switching element supporting the second contact 331. The first shield 36 and the second shield 37 are insulated from each other by an insulating sleeve 38. The first shield 36 is not completely covered by the insulating sleeve 38, and the head of the first shield 36 leaves at least a sufficient portion for connection with the shield lead-out pin 13.

[0081] In this embodiment, the first shield 36, the second shield 37, and the insulating sleeve 38 are substantially coaxial. The reed switch assembly 3 is fixed by filling the gap between the insulating sleeve 38 and the glass body 31 with insulating potting compound 4. The double-shielded structure formed by the first shield 36 and the second shield 37 significantly improves the anti-interference capability and ensures reliability in complex electromagnetic environments. In addition, the insulating sleeve 38 between the first shield 36 and the second shield 37 enhances the electrical insulation performance, improving the safety and stability of the product. In this embodiment, the first shield 36 and the second shield 37 are both formed of copper foil, copper extrusion layer, or any other form or any other suitable conductive material, and the insulating sleeve 38 is formed of PTFE, FEP, or any other form or any other suitable high-insulation material.

[0082] In this embodiment, the two shielding leads 13 are respectively installed in the two shielding lead mounting slots 18, and are fixed by filling the two shielding lead mounting slots 18 with insulating potting compound 4. The two shielding leads 13 are respectively connected to the first shield 36 and the second shield 37.

[0083] In this embodiment, the two reed switch leads 35 are connected to the first lead 341 and the second lead 342, respectively. The two reed switch leads 35 are suspended in the air and do not contact any components of the reed relay. This open structure provides a large creepage distance and, by using air with a low dielectric constant instead of insulating material, significantly improves the insulation performance and stability of the reed relay. Traditional reed switches are typically encapsulated in polyurethane or epoxy resin, which limits the creepage distance, and the dielectric constant of the encapsulation material increases due to temperature and humidity, thus limiting the product's insulation resistance.

[0084] In this embodiment, the shielding cover 5 is formed of any suitable high magnetic permeability material such as electrical pure iron or permalloy, and is installed on the coil winding 2 to cover the coil winding 2 as much as possible.

[0085] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A high-insulation, double-shielded reed relay, comprising a frame (1), characterized in that, The skeleton (1) has a horizontal through cavity (11), a coil winding (2) is wound around the outside of the through cavity (11), and a reed switch assembly (3) is installed inside the through cavity (11). The frame (1) is provided with a set of coil lead-out pins (12) and a set of shield lead-out pins (13), and the beginning and end ends of the coil winding (2) are respectively connected to the coil lead-out pins (12); The reed switch assembly (3) includes a glass body (31) covered with an insulating coating (311), and a first switching element (32) and a second switching element (33) are provided inside the glass body (31); the first switching element (32) and the second switching element (33) are both connected to switch leads (34), and the switch leads (34) are both connected to reed switch lead-out feet (35) with their ends suspended in the air; The outer side of the glass body (31) is provided with a first shield (36) corresponding to the first switching element (32) and a second shield (37) corresponding to the second switching element (33). The first shield (36) and the second shield (37) are respectively connected to the shield lead-out feet (13) on the frame (1). An insulating sleeve (38) is also provided between the first shield (36) and the second shield (37).

2. The high-insulation, double-shielded reed relay according to claim 1, characterized in that, The skeleton (1) includes a first base (14) and a second base (15), which are connected by a through cavity (11).

3. A high-insulation, double-shielded reed relay according to claim 2, characterized in that, The first base (14) and the second base (15) are both provided with glue-filling grooves (16) at the connection points with the through cavity (11). The reed switch assembly (3) is installed at both ends of the through cavity (11) and connected to the glue-filling grooves (16) through insulating glue material (4).

4. A high-insulation, double-shielded reed relay according to claim 2, characterized in that, The first base (14) is provided with a set of fixing pins (17) for mounting; The coil lead (12) is located on the second base (15); The skeleton (1), coil lead (12) and fixed pin (17) are integrally connected.

5. A high-insulation, double-shielded reed relay according to claim 2, characterized in that, Both the first base (14) and the second base (15) are provided with shielded lead-out foot mounting grooves (18); The shielding lead-out pins (13) are respectively installed in the shielding lead-out pin mounting slots (18) of the two bases and fixed by filling with insulating potting compound (4).

6. A high-insulation, double-shielded reed relay according to claim 1, characterized in that, The coil winding (2) is formed by uniformly winding enameled wire on the outside of the through cavity (11); At least one loop of insulating tape (21) is also wound on the coil winding (2).

7. A high-insulation, double-shielded reed relay according to claim 1, characterized in that, The coil winding (2) is covered with a shield (5).

8. A high-insulation, double-shielded reed relay according to claim 1, characterized in that, The first switching element (32) has a first contact (321) at its top end, and the second switching element (33) has a second contact (331) at its top end; The first contact (321) and the second contact (331) can be attracted together by the magnetic field of the coil winding (2).

9. A high-insulation, double-shielded reed relay according to claim 8, characterized in that, The first shield (36) at least partially surrounds the first switching element (32), and the second shield (37) at least partially surrounds the second switching element (33).

10. A high-insulation, double-shielded reed relay according to claim 1, characterized in that, The insulating sleeve (38) partially covers the first shield (36), and the part of the first shield (36) not covered by the insulating sleeve (38) is connected to the shield lead-out pin (13); The first shield (36), the second shield (37) and the insulating sleeve (38) are basically coaxially arranged, and the gap between the insulating sleeve (38) and the glass body (31) is filled with insulating potting compound (4).

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