A compact radio frequency switch electromagnetic coil core shaft structure

Abstract

The present invention relates to the field of radio frequency communication technology, and discloses a compact radio frequency switch electromagnetic coil core shaft structure, comprising: a lower plastic baffle, a coil core shaft, an upper plastic baffle, a pin holder, a metal pin, an electromagnetic coil fixing plate, a locking screw, and a PCB board. The lower and upper plastic baffles are respectively press-fitted and fixed to the two ends of the coil core shaft to form a core shaft assembly. The upper plastic baffle is internally connected to the pin holder, and the pin holder is internally connected to the metal pin. The core shaft assembly is fixed to the lower surface of the electromagnetic coil fixing plate by a locking screw. The metal pin passes through the electromagnetic coil fixing plate and is welded to the PCB board. By winding enameled copper wire around the surface of the coil core shaft and directly welding the two ends of the copper wire through the metal pin built into the upper plastic baffle, this structure reduces the number of independent components, reduces the overall size, effectively saves internal space of the switch, and reduces material cost and processing complexity.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency communication technology, and in particular to a compact radio frequency switch electromagnetic coil core shaft structure. Background Art

[0002] In the communications field, radio frequency mechanical switches are key components for switching between different signal channels. Their core driving component is an electromagnetic coil structure. When energized, the electromagnetic coil generates electromagnetic attraction through the iron core, driving the switch plate to switch signal channels. Existing electromagnetic coil designs must balance compactness and electromagnetic performance. Especially with the trend toward device miniaturization, improving coil efficiency and simplifying structure within limited space have become key technical challenges.

[0003] The traditional RF switch electromagnetic coil structure is made of enameled copper wire wound on a dedicated plastic winding pole. The two ends are welded to the wire and connected to the circuit board. The iron core is then inserted into the winding pole. When power is applied, the iron core generates a magnetic field, and the magnetic force on the iron core causes the RF switch to switch.

[0004] In the existing technology, it is necessary to first wind the enameled copper wire on a special plastic winding pole, weld the two ends to the wire and then weld them to the circuit board, and then insert the iron core into the winding pole and energize it to generate magnetic force. The parts processing is complicated, the cost is high, and the manufacturing process is complicated. When the internal space of the switch is limited, the number of turns of the coil is small, and the magnetic force on the iron core is insufficient. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a compact radio frequency switch electromagnetic coil core shaft structure, which solves the problems of traditional radio frequency switch electromagnetic coil structures, such as complex parts processing, high cost, and complex manufacturing process.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a compact radio frequency switch electromagnetic coil core shaft structure, comprising: a lower plastic baffle, a coil iron core shaft, an upper plastic baffle, a pin holder, a metal pin, an electromagnetic coil fixing plate, a locking screw and a PCB board, the lower plastic baffle and the upper plastic baffle are respectively press-fitted and fixed on the two ends of the coil iron core shaft to form a core shaft assembly, the upper plastic baffle is internally connected to the pin holder, the pin holder is internally connected to the metal pin, the metal pin is welded to the enameled copper wire wound on the coil iron core shaft, the core shaft assembly is fixed to the lower surface of the electromagnetic coil fixing plate by a locking screw, the metal pin passes through the electromagnetic coil fixing plate and is welded to the PCB board.

[0007] Preferably, the lower plastic baffle, the upper plastic baffle and the coil core shaft are assembled by interference fit or press fit.

[0008] Preferably, the pin seat and the metal pin are fixed to the upper plastic baffle by press-fit assembly, and a gap is left between the pin seat and the electromagnetic coil fixing plate to prevent the metal pin from short-circuiting with the outside.

[0009] Preferably, the coil core shaft is made of magnetic material.

[0010] Preferably, guide and mounting holes are provided inside the coil core shaft and the upper plastic baffle.

[0011] Preferably, the enameled copper wire is directly wound on the surface of the coil core shaft, and both ends of the enameled copper wire are welded to the outer wall of the metal pin.

[0012] Preferably, the coil core shaft is in direct contact with the enameled copper wire.

[0013] Preferably, the electromagnetic coil fixing plate is provided with a through hole for the metal pin to pass through and be welded to the PCB board to form an electrical connection.

[0014] Preferably, the locking screw fastens the core shaft assembly to the electromagnetic coil fixing plate.

[0015] Working principle: First, press the lower plastic baffle onto the core shaft. After it is pressed into place, press the upper plastic baffle into place. Install the core shaft assembly on the winding machine fixture. Wind the copper wire onto the core shaft according to the set program. After winding, fix the copper wire. Install the pin holder and metal pins on the upper plastic baffle. Then solder the copper wire to the metal pins. Install the entire assembly to the fixing plate with screws. Solder the metal pins to the PCB board to complete the assembly.

[0016] When the enameled copper wire is directly wound on the surface of the coil core shaft made of magnetic material and energized, the magnetic field generated by the current is concentrated and enhanced through the high magnetic permeability coil core shaft, forming an electromagnetic attraction to drive the RF switch switching board to switch the signal channel. The copper wire is tightly wound on the coil core shaft. According to Ampere's law, the magnetic field strength is significantly improved, which solves the problem of insufficient suction caused by space limitation. The two ends of the copper wire are directly welded to the metal pins of the upper plastic baffle, shortening the conductive path and reducing the contact resistance. At the same time, the copper wire is in direct contact with the coil core shaft to avoid the heating of the coil affecting the switch performance. The material baffle and the upper plastic baffle are press-fitted onto both ends of the coil core shaft through an interference fit, and the guide mounting holes on the core shaft and the upper plastic baffle and the magnetic winding fixture are used to simplify the assembly process. The core shaft assembly is fixed to the electromagnetic coil fixing plate by locking screws, and the metal pins are welded to the PCB board through the through holes on the electromagnetic coil fixing plate. The gap design between the pin holder and the electromagnetic coil fixing plate ensures circuit safety and avoids short circuits between the metal pins and the outside. The overall structure optimizes space utilization, enhances the magnetic field, and ensures that the RF switch is sensitive and switches smoothly in a compact space, effectively reducing material and processing costs.

[0017] The present invention provides a compact radio frequency switch electromagnetic coil core shaft structure, which has the following beneficial effects:

[0018] 1. The present invention eliminates the plastic winding post in the traditional structure, directly winds the enameled copper wire on the surface of the coil core shaft, and directly welds the two ends of the copper wire through the metal pins built into the upper plastic baffle, eliminating the "copper wire-electrical wire-circuit board" transition link. Compared with the complex process of winding the wire on the plastic winding post and then welding the transition wire in the existing technology, this structure reduces the number of independent components, reduces the overall size, effectively saves internal space of the switch, and reduces material cost and processing complexity.

[0019] 2. This invention utilizes the iron core's excellent thermal conductivity, creating a highly efficient heat conduction path through direct contact between the enameled copper wire and the coil's core shaft. This allows heat generated by the coil to be quickly transferred through the core shaft to the external structure, preventing the risk of switch failure due to heat accumulation. Furthermore, the metal pins and pin holders are press-fit assembled and directly soldered with copper wire, shortening the conductive path, reducing contact resistance, and improving conductivity efficiency and connection reliability.

[0020] 3. The lower and upper plastic baffles of this invention are assembled with the coil core shaft through an interference fit, eliminating the need for additional adhesives or fasteners. This simplifies the cumbersome process of traditional multi-component assembly while ensuring the shaft assembly maintains coaxiality and structural stability during winding and use. A gap is provided between the pin holder and the electromagnetic coil mounting plate to effectively prevent external short circuits between the metal pins and enhance circuit safety.

[0021] 4. Through its compact design, this invention maximizes the number of coil turns and optimizes magnetic field strength within a limited space, meeting the development needs of miniaturized and highly reliable RF switches. Furthermore, its standardized press-fit assembly and fixture compatibility make it suitable for large-scale automated production, significantly reducing labor costs and assembly errors, and improving production efficiency and product consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the partial structure of the electromagnetic coil fixing plate of the present invention;

[0024] Figure 3 This is a schematic diagram of the partial structure of the coil core shaft of the present invention;

[0025] Figure 4 This is a schematic diagram of the partial structure of the upper plastic baffle of the present invention;

[0026] Figure 5It is a schematic diagram of the local structure of the pin socket of the present invention.

[0027] Among them, 1. Lower plastic baffle; 2. Coil core shaft; 3. Upper plastic baffle; 4. Pin holder; 5. Metal pin; 6. Electromagnetic coil fixing plate; 7. Locking screw; 8. PCB board. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Please see the attached Figure 1 -Attached Figure 3 An embodiment of the present invention provides a compact RF switch electromagnetic coil core shaft structure, including: a lower plastic baffle 1, a coil iron core shaft 2, an upper plastic baffle 3, a pin seat 4, a metal pin 5, an electromagnetic coil fixing plate 6, a locking screw 7 and a PCB board 8. The lower plastic baffle 1 and the upper plastic baffle 3 are respectively press-fitted and fixed on the two ends of the coil iron core shaft 2 to form a core shaft assembly. The upper plastic baffle 3 is internally connected to the pin seat 4, and the pin seat 4 is internally connected to the metal pin 5. The metal pin 5 is welded to the enameled copper wire wound on the coil iron core shaft 2. The core shaft assembly is fixed to the lower surface of the electromagnetic coil fixing plate 6 by the locking screw 7. The metal pin 5 passes through the electromagnetic coil fixing plate 6 and is welded to the PCB board 8.

[0030] Specifically, when the enameled copper wire is directly wound around the surface of the coil core shaft 2 made of magnetic material and energized, the magnetic field generated by the current is concentrated and enhanced through the highly magnetically permeable coil core shaft 2, forming an electromagnetic attraction to drive the RF switch switching board to operate, thereby realizing signal channel switching. This design eliminates the external plastic winding column and tightly winds the copper wire around the coil core shaft 2. The outer diameter space of the core shaft is maximized to increase the number of coil turns, and the magnetic field strength is significantly improved according to Ampere's law, solving the problem of insufficient suction caused by space limitations. The two ends of the copper wire are directly welded to the metal pins 5 of the upper plastic baffle 3, shortening the conductive path and reducing the contact resistance. At the same time, the copper wire is in direct contact with the coil core shaft 2, and the good thermal conductivity of the iron core is used to quickly dissipate heat, thereby preventing the heating of the coil from affecting the switch. The lower plastic baffle 1 and the upper plastic baffle 3 are press-fitted at both ends of the coil core shaft 2 through an interference fit, and the guide mounting holes on the core shaft and the upper plastic baffle 3 and the magnetic winding fixture are used to realize the precise positioning and automatic winding of the core shaft assembly, simplifying the assembly process. The core shaft assembly is fixed to the electromagnetic coil fixing plate 6 by a locking screw 7, and the metal pin 5 passes through the through hole on the electromagnetic coil fixing plate 6 and is welded to the PCB board 8. The gap design between the pin seat 4 and the electromagnetic coil fixing plate 6 ensures circuit safety and avoids short circuit between the metal pin 5 and the outside. The overall structure optimizes space utilization, enhances the magnetic field, improves heat dissipation efficiency and simplifies the production process to ensure that the RF switch is sensitive and switches smoothly in a compact space, effectively reducing material and processing costs.

[0031] Please see the attached Figure 1 and attached Figure 3 The lower plastic baffle 1, the upper plastic baffle 3 and the coil core shaft 2 are assembled by interference fit.

[0032] Specifically, the interference fit makes the lower plastic baffle 1 and the upper plastic baffle 3 firmly adhere to the two ends of the coil core shaft 2, forming a physical limit for the coil winding area, ensuring that the core shaft assembly maintains coaxiality during the winding process, avoiding axial or radial displacement caused by external forces, thereby ensuring the position accuracy of the enameled copper wire during winding and the stability of the coil structure. At the same time, no additional adhesives or fasteners are required, and assembly can be completed only by mechanical press-fitting, which simplifies the complex process of combining multiple parts in traditional structures and reduces the reliability risk caused by loose connectors.

[0033] Please see the attached Figure 2 and attached Figure 5 The pin seat 4 and the metal pin 5 are fixed on the upper plastic baffle 3 by press-fit assembly, and a gap is left between the pin seat 4 and the electromagnetic coil fixing plate 6 to prevent the metal pin 5 from short-circuiting with the outside.

[0034] Specifically, the press-fitting process forms a rigid connection between the metal pin 5 and the pin holder 4, ensuring that after the two ends of the enameled copper wire are welded to the metal pin 5, the current can be stably conducted to the PCB board 8 through the pin holder 4, avoiding the problem of increased resistance or signal loss due to loose contact. The gap reserved between the pin holder 4 and the electromagnetic coil fixing plate 6 forms an electrically insulating isolation space, preventing the metal pin 5 from directly contacting the electromagnetic coil fixing plate 6 or external structure due to factors such as vibration and assembly error, thereby avoiding the risk of short circuit. At the same time, the installation freedom and positioning accuracy of the pin holder 4 are taken into account, ensuring that the metal pin 5 only forms an effective electrical connection with the soldering point of the PCB board 8 when passing through the electromagnetic coil fixing plate 6, and the remaining parts remain insulated, thereby improving the safety and reliability of the overall circuit.

[0035] Please see the attached Figure 3 , the coil core shaft 2 is made of magnetic material.

[0036] Specifically, the magnetic permeability of magnetic materials is much higher than that of air, and they can effectively gather the magnetic flux lines generated by the enameled copper wire after being energized, significantly enhancing the magnetic field strength inside and around the coil core shaft 2. By directly using the coil core shaft 2 as a winding carrier, the weakening of the magnetic field by non-magnetic materials is eliminated, and the electromagnetic attraction generated under the same current is greatly improved, ensuring that the RF switch switching board can still obtain sufficient driving force in a compact space, thereby realizing sensitive and reliable signal switching.

[0037] Please see the attached Figure 1 and attached Figure 2 The coil core shaft 2 and the upper plastic baffle 3 are provided with guide and mounting holes; the locking screw 7 fastens the core shaft assembly and the electromagnetic coil fixing plate 6.

[0038] Specifically, the size and shape of the guide hole match the positioning column of the magnetic winding jig. During winding, the core shaft assembly forms a mechanical position with the jig through the hole position. At the same time, the magnetic adsorption effect of the coil core shaft 2 is utilized to ensure that it is stably fixed on the winding machine, avoiding core shaft deviation caused by vibration or uneven force during high-speed winding.

[0039] When the winding of the core shaft assembly is completed, the pin seat 4 and the metal pin 5 can be quickly aligned through the hole and press-fitted to the upper plastic baffle 3. When the core shaft assembly is connected to the locking screw 7 of the electromagnetic coil fixing plate 6 through the mounting hole, the hole guiding effect ensures the coaxiality of each component, avoiding poor contact or stress concentration problems caused by assembly deviation.

[0040] Please see the attached Figure 1 and attached Figure 2 The enameled copper wire is directly wound on the surface of the coil core shaft 2, and both ends of the enameled copper wire are welded to the outer wall of the metal pin 5.

[0041] Specifically, the copper wire is directly and tightly wound around the coil core shaft 2, eliminating the space occupied by the wall thickness of the winding column, allowing the core shaft of the same length to accommodate more turns, significantly increasing the number of coil turns in scenarios where the internal space of the switch is limited, and effectively improving the magnetic field strength according to Ampere's law, ensuring that the iron core generates sufficient electromagnetic attraction to drive the switch switching board to move precisely.

[0042] The two ends of the copper wire are directly welded to the metal pins 5, eliminating the "copper wire-electrical wire-circuit board" transition link, shortening the conductive path and reducing contact resistance, thereby improving conductive efficiency. The welding point is located on the outside of the upper plastic baffle 3, which facilitates process operation and quality inspection, and avoids the space limitations and reliability risks of internal welding in traditional structures.

[0043] Please see the attached Figure 1 , the coil core shaft 2 is in direct contact with the enameled copper wire.

[0044] Specifically, the coil core shaft 2 is made of silicon steel or iron-based alloy, and its thermal conductivity is much higher than that of the plastic winding column in the traditional structure. The enameled copper wire fits tightly to the surface of the core when wound. The heat generated by the power supply can be quickly conducted to the inside of the core shaft through direct contact between the metals, and then diffused to the outside through the lower plastic baffle 1, upper plastic baffle 3 and electromagnetic coil fixing plate 6 at both ends of the core shaft, forming an efficient heat conduction path to avoid heat accumulation in the coil area.

[0045] Please see the attached Figure 1 and attached Figure 2 The electromagnetic coil fixing plate 6 is provided with a through hole for the metal pin 5 to pass through and be welded to the PCB board 8 to form an electrical connection.

[0046] Specifically, the size and position of the through-holes on the electromagnetic coil fixing plate 6 match the specifications of the metal pins 5. When the metal pins 5 pass through these through-holes, they can be accurately positioned to ensure that they are accurately aligned with the welding points on the PCB board 8. After passing through the through-holes, the metal pins 5 are soldered to the PCB board 8 to form a direct electrical connection, reducing intermediate links, lowering resistance and signal transmission losses. The current in the enameled copper wire can be smoothly conducted to the PCB board 8 through the metal pins 5, ensuring that the RF switch can receive and transmit electrical signals in a timely and accurate manner during operation.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A compact radio frequency switch electromagnetic coil core shaft structure, characterized in that: include: A lower plastic baffle (1), a coil core shaft (2), an upper plastic baffle (3), a pin seat (4), a metal pin (5), an electromagnetic coil fixing plate (6), a locking screw (7) and a PCB board (8), wherein the lower plastic baffle (1) and the upper plastic baffle (3) are respectively press-fitted and fixed on both ends of the coil core shaft (2) to form a core shaft assembly, the interior of the upper plastic baffle (3) is connected to the pin seat (4), the interior of the pin seat (4) is connected to the metal pin (5), the metal pin (5) is welded to the enameled copper wire wound on the coil core shaft (2), the core shaft assembly is fixed to the lower surface of the electromagnetic coil fixing plate (6) by the locking screw (7), the metal pin (5) passes through the electromagnetic coil fixing plate (6) and is welded to the PCB board (8); The lower plastic baffle (1), the upper plastic baffle (3) and the coil core shaft (2) are assembled by interference fit and press fit; The coil core shaft (2) and the upper plastic baffle (3) are provided with guide and mounting holes; The enameled copper wire is directly wound on the surface of the coil core shaft (2), and both ends of the enameled copper wire are welded to the outer wall of the metal pin (5); The locking screw (7) fastens the core shaft assembly to the electromagnetic coil fixing plate (6).

2. The compact RF switch electromagnetic coil core shaft structure according to claim 1, characterized in that: The pin seat (4) and the metal pin (5) are fixed to the upper plastic baffle (3) by press-fit assembly, and a gap is left between the pin seat (4) and the electromagnetic coil fixing plate (6) to prevent the metal pin (5) from short-circuiting with the outside.

3. The compact RF switch electromagnetic coil core shaft structure according to claim 1, characterized in that: The coil iron core shaft (2) is made of magnetic material.

4. The compact RF switch electromagnetic coil core shaft structure according to claim 1, characterized in that: The electromagnetic coil fixing plate (6) is provided with a through hole for the metal pin (5) to pass through and be welded to the PCB board (8) to form an electrical connection.

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