Temperature-deformation-resistant surface-mounted radio frequency relay reed assembly

Abstract

The invention discloses a surface-mounted radio frequency relay reed assembly resistant to temperature deformation, which comprises a transmission reed, a radio frequency reed and an injection molding material, and the transmission reed and the radio frequency reed are collinear in the height direction at the injection molding position and are arranged at an interval. According to the invention, the transmission reed and the radio frequency reed are collinear at the injection molding position along the height direction, so that the injection molding material is only subjected to pressure stress, and the pressure resistance of the injection molding material is higher than the thermal deformation capability, so that the thermal deformation at high temperature is effectively reduced, and the high-temperature reliability of the product is ensured.

Description

Technical Field

[0001] This invention relates to the field of surface-mount radio frequency relay technology, and more particularly to a surface-mount radio frequency relay spring assembly resistant to temperature deformation. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] Surface-mount radio frequency (RF) relays are widely used in various fields such as terrestrial communication, electronic warfare, and automated control systems due to their advantages of small size, high power, excellent RF performance, and ease of integration. An RF relay is an electromechanical component that switches RF channels via electromagnetic drive; the injection-molded spring is a crucial actuating component for achieving this channel switching.

[0004] Surface-mount RF relays typically use injection-molded RF springs and auxiliary springs, formed by injection molding with plastic material. However, existing injection-molded materials exhibit significant thermal deformation at high temperatures. During reflow soldering and high-power signal transmission, a large amount of heat is transferred to the RF spring, which in turn is conducted to the injection-molded material. The poor thermal conductivity of the injection-molded material leads to heat concentration, causing a rapid rise in the temperature of both the RF spring and the injection-molded material. While the RF spring, being a metal material, has good temperature resistance, the plastic material has limited temperature resistance. When the plastic material reaches excessively high temperatures, thermal deformation occurs, resulting in reduced contact pressure when the RF spring closes, leading to poor contact and ultimately, deterioration of RF performance or even failure.

[0005] To address the aforementioned issues, there are currently two main countermeasures: 1. Using insulating materials with better high-temperature resistance for the injection molding compound; 2. Strictly limiting the temperature and welding time during surface-mount relay soldering. However, due to limitations in the performance of existing insulating materials and injection molding processes, there is currently no suitable material that can fully meet both the requirements of high-temperature resistance and ease of injection molding. The instantaneous temperature during surface-mount relay soldering can reach over 300℃, and due to varying soldering conditions, it is difficult for users to strictly adhere to the specified soldering temperature and time. Therefore, this application provides a surface-mount RF relay spring assembly with resistance to temperature deformation to solve these problems. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned shortcomings by providing a surface-mount radio frequency relay spring assembly that is resistant to temperature deformation.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A surface-mount radio frequency relay spring assembly resistant to temperature deformation includes a drive spring, a radio frequency spring, and an injection molding compound. The drive spring and the radio frequency spring are collinear and spaced apart along the height direction at the injection molding position.

[0008] Furthermore, one side of the corresponding stationary contact of the RF reed is provided with a protrusion, which contacts the stationary contact.

[0009] Furthermore, the injection molding position of the radio frequency spring is located in the middle, and the convex bulge is located at both ends of the radio frequency spring.

[0010] Furthermore, the convex hull makes point contact with the stationary contact point.

[0011] Furthermore, the convex hull is hemispherical, with its spherical surface facing the direction of the stationary contact point.

[0012] Furthermore, the convex hull makes contact with the stationary contact point in the form of a line contact.

[0013] Furthermore, the convex hull is semi-cylindrical, with the axis of the semi-cylindrical part parallel to the surface of the radio frequency spring.

[0014] The beneficial effects of this invention are reflected in: In this application, the transmission spring and the radio frequency spring are collinear along the height direction at the injection position. Therefore, the injection molding material is only subjected to compressive stress. Since the compressive strength of the injection molding material is higher than its thermal deformation strength, this method effectively reduces the amount of thermal deformation at high temperatures and ensures the high-temperature reliability of the product. Attached Figure Description

[0015] Figure 1 A structural view of a traditional reed assembly; Figure 2 This is a structural view of the surface-mount radio frequency relay spring assembly with temperature deformation resistance described in this invention; Figure 3 This is a structural view of the surface-mount radio frequency relay reed assembly with a convex hull in this invention; Figure 4 This is a front view of the radio frequency reed described in this invention; Figure 5 This is a side view of the radio frequency reed described in this invention.

[0016] In the picture: 1. Transmission spring; 2. Radio frequency spring; 21. Convex bulge; 3. Injection-molded plastics. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1 , Figure 1 The structure is a traditional spring assembly, consisting of a drive spring 1, an RF spring 2, and injection molding compound. The injection molding compound is located in the middle, with its two ends connected to the drive spring 1 and the RF spring 2, respectively. When the injection spring closes, the contact area (i.e., the RF spring 2) is subjected to a support force F1 perpendicular to the paper and inward, while simultaneously subjected to a force F2 perpendicular to the paper and outward, exerted by the actuating mechanism (i.e., the drive spring 1). Since F1 and F2 are opposite in direction and not collinear, the injection molding compound is subjected to a bending moment, M = dF1 (F1 = F2). When the spring assembly is heated, this bending moment can easily cause deformation of the injection molding compound, reducing product reliability.

[0019] To address the aforementioned problems, this invention discloses a surface-mount radio frequency relay spring assembly resistant to temperature deformation.

[0020] Example 1: Please see Figure 2-5 The surface-mount RF relay spring assembly with temperature deformation resistance includes a drive spring 1, an RF spring 2, and injection molding material. The drive spring 1 and the RF spring 2 are collinear and spaced apart along the height direction at the injection position.

[0021] In practice, considering that the injection-molded plastic 3 of the traditional reed assembly will be subjected to bending moment, this patent adopts a new injection molding method. Figure 2 The transmission spring 1 and the radio frequency spring 2 are collinear along the height direction at the injection position, so the injection molded material is only subjected to compressive stress (F1 and F2 are collinear and in opposite directions). Generally speaking, the compressive strength of the injection molded material is higher than its heat deformation. In this way, the heat deformation at high temperatures is effectively reduced, ensuring the high-temperature reliability of the product.

[0022] It should be noted that the radio frequency spring 2 and the transmission spring 1 are separated by injection molding material to ensure that they are not conductive (this can be achieved by positioning the radio frequency spring 2 and the transmission spring 1 through the injection mold during injection molding). The gap height can be the height difference between the radio frequency spring 2 and the transmission spring 1 in a traditional spring assembly.

[0023] Furthermore, in low-temperature and high-humidity environments, moisture and impurities in the microwave channel of traditional RF relays can cause a layer of frost-like film containing impurities to form on the surface of the moving and stationary contacts of the RF spring 2. Under normal operating conditions, this frost film is difficult to break through. Additionally, in low-temperature environments, the injection molding material of traditional RF relays shrinks and deforms, and the transmission spring 1 and RF spring 2 are also prone to deformation due to low temperatures. This can lead to incomplete contact at the RF contacts, causing deterioration of the product's RF performance or even failure. Therefore, this application also includes the following technical solutions: The radio frequency reed 2 has a protrusion 21 on one side of the corresponding stationary contact (not shown in the figure), and the protrusion 21 contacts the stationary contact.

[0024] In practical implementation, the convex bulge 21 reduces the contact area between the RF spring 2 and the stationary contact when the RF spring 2 is in position, increasing the pressure between them. This effectively breaks the frost film on the contact surface at low temperatures, ensuring the product's reliability during low-temperature operation. Furthermore, since the transmission spring 1 and the RF spring 2 are collinear in the height direction, this design shortens the lever arm between them, resulting in a greater force transmitted to the RF spring 2. Combined with the convex bulge 21, this further enhances the pressure between the RF spring 2 and the stationary contact, ensuring the effective breaking of the frost film on the contact surface at low temperatures and further guaranteeing the product's reliability during low-temperature operation.

[0025] It should be noted that the static contact is usually a surface for contact, not a point.

[0026] In one embodiment, the injection molding position of the RF spring 2 is located in the middle, and the protrusion 21 is located at both ends of the RF spring 2.

[0027] In specific implementation, the transmission spring 1 is connected to the middle of the radio frequency spring 2. Since this application only adjusts the position and structure of the radio frequency spring 2, and nothing else is changed, the distance that the transmission spring 1 can drive the radio frequency spring 2 to move is also unchanged. Because the radio frequency spring 2 can produce elastic deformation, after the convex 21 contacts the stationary contact, the transmission spring 1 will continue to drive the middle of the radio frequency spring 2 to move downward (the moving distance is the height of the convex 21), continuously applying pressure to the convex 21. At this time, the radio frequency spring 2 will produce an arc-shaped bend, which will force the convex 21 to continuously and reliably contact the stationary contact. While further increasing the contact pressure and breaking the frost film on the contact surface at low temperatures, it can overcome poor contact caused by vibration or low-temperature deformation, further ensuring the reliability of the product's low-temperature operation. In addition, even if the injection molding material undergoes thermal deformation, this design can compensate for some of the deformation, ensuring reliable operation at both high and low temperatures.

[0028] In one embodiment, the convex bulge 21 makes point contact with the stationary contact point. By using point contact, the contact area is further reduced, thereby increasing the pressure during contact and significantly improving the reliability of the product's low-temperature contact.

[0029] In one embodiment, the convex bulge 21 is hemispherical, with its spherical surface facing the stationary contact point.

[0030] Example 2: The only difference between this embodiment and Embodiment 1 is the contact pattern between the convex hull 21 and the stationary contact, as detailed below: In this embodiment, the convex bulge 21 makes line contact with the stationary contact point. Although the pressure of line contact is not as high as that of point contact, it can further ensure the reliability of the contact, reduce the probability of poor contact, and with the combined support of other measures in Embodiment 1, it still has the pressure to break the frost film, thus exhibiting good overall performance.

[0031] In this embodiment, the convex bulge 21 is semi-cylindrical, and the axis of the semi-cylindrical part is parallel to the surface of the radio frequency spring 2.

[0032] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0034] Additionally, "multiple" refers to two or more.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A surface-mount radio frequency relay spring assembly resistant to temperature deformation, characterized in that, It includes a drive spring (1), an RF spring (2) and an injection molding compound. The drive spring (1) and the RF spring (2) are collinear and spaced apart along the height direction at the injection position.

2. The surface-mount RF relay spring assembly with temperature deformation resistance according to claim 1, characterized in that, The radio frequency reed (2) has a protrusion (21) on one side of the corresponding stationary contact, and the protrusion (21) contacts the stationary contact.

3. The surface-mount RF relay spring assembly with temperature deformation resistance according to claim 2, characterized in that, The injection molding position of the radio frequency spring (2) is located in the middle, and the convex bulge (21) is located at both ends of the radio frequency spring (2).

4. The surface-mount RF relay spring assembly with temperature deformation resistance according to claim 2 or 3, characterized in that, The convex hull (21) makes point contact with the stationary contact point.

5. The surface-mount RF relay spring assembly with temperature deformation resistance according to claim 4, characterized in that, The convex hull (21) is hemispherical, with its spherical surface facing the direction of the stationary contact point.

6. The surface-mount RF relay spring assembly with temperature deformation resistance according to claim 2 or 3, characterized in that, The convex hull (21) makes contact with the stationary contact point in the form of line contact.

7. The surface-mount RF relay spring assembly with temperature deformation resistance according to claim 6, characterized in that, The convex hull (21) is semi-cylindrical, and the axis of the semi-cylindrical part is parallel to the surface of the radio frequency spring (2).

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