Filtering devices suitable for mobile phone shielding

Abstract

This invention discloses a filtering device suitable for mobile phone shielding, comprising a connector, a tube, a first conductive element, a second conductive element, and a tubular ceramic capacitor. The connector includes a metal housing and a conductive core disposed within it. The tube is also made of metal, with its front end connected to the rear end of the connector housing. The first conductive element passes through the tube axially from within it, without contacting the tube. The front end of the first conductive element is connected to the conductive core of the connector. The second conductive element is disposed outside the tube, with its front end connected to the connector housing. The tubular ceramic capacitors are connected in series with the first conductive element, with at least one of them sealing the rear end of the tube. The casing of the tubular ceramic capacitor includes a conductive portion connected to the tube. Compared with existing technologies, this filtering device not only performs better in high-frequency filtering and electromagnetic shielding, but its structural design is also simpler and more practical.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic shielding technology, and in particular to a filtering device suitable for shielding mobile phones. Background Technology

[0002] A mobile phone shielding cabinet is a specialized device that uses physical shielding technology to block wireless signals. Its core principle is to attenuate and absorb electromagnetic waves through a sealed space made of metal, preventing mobile phones inside the cabinet from establishing communication with base stations. This device enables centralized management of mobile terminals, preventing information leakage and resisting external electromagnetic interference.

[0003] With increasing market demand and technological advancements, the intelligence level of mobile phone shielding cabinets on the market is constantly improving, with numerous control and execution mechanisms integrated inside the cabinet. However, these mechanisms all require electrical drive. How to ensure a stable power supply to the electrical equipment inside the cabinet while maintaining the shielding effect has become a pressing problem for major mobile phone shielding cabinet manufacturers. Currently, the mainstream solution to this problem is to install a filter device on the cabinet. The outer end of this filter device is connected to the power supply, while the inner end is connected to the electrical equipment via wires. This solution is adopted in the applicant's Chinese invention patent CN115426865B, which has been granted.

[0004] Although the above solution balances the power requirements and shielding effect of the mobile phone shielding cabinet, the complex structure, cumbersome assembly process, and high production cost of this filtering device make it less cost-effective for mobile phone shielding cabinet manufacturers. Therefore, the existing technology still needs further improvement. Summary of the Invention

[0005] The purpose of this invention is to provide a filtering device suitable for mobile phone shielding that has excellent performance, simple structure, is easy to manufacture, and has low cost.

[0006] To achieve the above objectives, one of the technical solutions adopted by the present invention is as follows:

[0007] A filtering device suitable for shielding mobile phones includes a connector, a tube, a first conductive element, a second conductive element, and a tubular ceramic capacitor.

[0008] The connector includes a metal outer shell and a conductive core disposed inside it, the two being insulated from each other. The conductive core is used to connect to the positive terminal of a power supply, and the outer shell is used for grounding.

[0009] The tubing is made of metal, and its front end is connected to the rear end of the connector's housing.

[0010] The first conductive element passes through the interior of the tube along its axial direction and does not contact the tube. The front end of the first conductive element is connected to the conductive core of the connector.

[0011] The second conductive element is disposed outside the tube, and its front end is connected to the housing of the connector.

[0012] The tubular ceramic capacitors are connected in series with the first conductive element, and at least one of them is sealed at the rear end of the tube. The tubular ceramic capacitor includes a ceramic body and a shell covering the outer peripheral surface of the ceramic body. The ceramic body is connected in series with the first conductive element through its axial hole. The shell includes a conductive portion, which is connected to the tube.

[0013] Since the frequencies of mobile phone communication signals such as 2G, 3G, 4G, 5G, Wi-Fi, and Bluetooth are typically higher than 700MHz, belonging to the high-frequency band, the filtering devices using the above-mentioned technical solutions perform excellently in attenuating these signals. Specifically:

[0014] The tubular ceramic capacitor is a feedthrough capacitor or a C-type feedthrough filter. When high-frequency currents and signals on the first conductive element pass through the tubular ceramic capacitor, they are directly bypassed to ground via its low-impedance path and thus effectively filtered out. However, low-frequency currents and signals on the first conductive element are allowed to pass through smoothly, maintaining their integrity and not affecting the normal operation of the circuit. Therefore, the tubular ceramic capacitor can effectively filter out some communication signals in the power supply circuit, preventing them from entering or exiting the mobile phone shielding cabinet.

[0015] In terms of electromagnetic shielding performance, the filtering device using the above-mentioned technical solution also performs excellently. Specifically, the outer shell of the connector, the tubular component, and the shell of the tubular ceramic capacitor are all conductive. When connected, they form a channel with a large aspect ratio. This not only effectively attenuates and absorbs communication signals entering the channel from the outside of the mobile phone shielding cabinet, but also effectively attenuates and absorbs communication signals radiated from the first conductive component, preventing them from diffusing into the inside of the mobile phone shielding cabinet, thereby ensuring that the shielding effect of the mobile phone shielding cabinet is not affected.

[0016] Compared with existing technologies, the filtering device using the above-mentioned technical solution not only performs better in high-frequency filtering and electromagnetic shielding, but also has a simpler and more practical structural design. Connectors, tubular ceramic capacitors, etc., are all commonly used standard parts, and tubular components and conductive parts are also commonly used consumables, which significantly reduces the production difficulty and cost of the filtering device, greatly improves its cost performance, and brings considerable economic benefits to mobile phone shielding cabinet manufacturers.

[0017] In the above technical solution, the filtering device further includes a hollow magnetic bead, which is strung on the first conductive element through its axial hole and disposed inside the tube.

[0018] The hollow magnetic bead is primarily composed of ferrite. For low-frequency currents and signals on the first conductive element, the hollow magnetic bead exhibits low impedance and high permeability, allowing them to pass through smoothly. Conversely, for high-frequency currents and signals on the first conductive element, the hollow magnetic bead has high impedance and low permeability, preventing their passage. Therefore, the hollow magnetic bead can effectively absorb and attenuate communication signals in the power supply circuit.

[0019] The hollow magnetic bead and the tubular ceramic capacitor are used in series on the first conductive component, which can not only greatly improve the high-frequency filtering efficiency, but also effectively broaden the filtering bandwidth. This ensures that the communication signal power in the power supply circuit is reduced to the level required by the mobile phone shielding cabinet, thus better meeting the actual application needs of the mobile phone shielding cabinet.

[0020] Furthermore, the hollow magnetic bead is also compatible with the above-mentioned structure of the filter device, making it easy to assemble. Moreover, since it is a commonly used standard part, it is inexpensive and will not significantly increase the manufacturing cost of the filter device.

[0021] In the above technical solution, the tubular fitting comprises only one section along its axial direction, and the front end of the tubular section is connected to the rear end of the connector's housing. At this time, there is also only one tubular ceramic capacitor, which is sealed at the rear end of the tubular section, and the conductive portion of the casing of the tubular ceramic capacitor is connected to the rear end of the tubular section. The hollow magnetic bead is disposed inside the tubular section.

[0022] In other technical solutions, the pipe fitting comprises multiple pipe segments along its axial direction. In this case, the number of tubular ceramic capacitors is equal to the number of pipe segments, and each tubular ceramic capacitor is correspondingly sealed at the rear end of each pipe segment. The hollow magnetic bead is disposed inside any one or more of the pipe segments.

[0023] The conductive portion of the casing of each tubular ceramic capacitor is connected to the rear end of the tubular segment located on its respective front side. The front end of the first tubular segment is connected to the rear end of the connector housing, and the front ends of the remaining tubular segments are connected to the conductive portion of the casing of the tubular ceramic capacitor located on its respective front side.

[0024] That is, the pipe segments and the tubular ceramic capacitors are arranged alternately along the first conductive element, and the adjacent pipe segments and the tubular ceramic capacitors are connected to each other.

[0025] Based on the above technical solutions, the filtering device provided by this invention has excellent adjustability and expandability in terms of specifications. When facing different application scenarios and performance requirements, simply add the tube segment and the tubular ceramic capacitor along the first conductive element, and connect the hollow magnetic beads in series with the first conductive element as needed, to obtain the filtering device of different specifications. There is no need to redesign the structure, making it highly practical and widely applicable.

[0026] For example, in certain application scenarios, when the filtering device consisting of only one hollow magnetic bead and one tubular ceramic capacitor is insufficient to attenuate the communication signal in the power supply circuit to the required power, two more sections of the tube and two more tubular ceramic capacitors can be added alternately along the first conductive element based on the original structural design, and one or two hollow magnetic beads can be connected in series as needed, thereby solving the problem of insufficient filtering performance.

[0027] In the above technical solution, the number of hollow magnetic beads is equal to the number of pipe segments, and each hollow magnetic bead is disposed inside each pipe segment.

[0028] In the above technical solution, the pipe includes three pipe sections along its axial direction, and the number of hollow magnetic beads and tubular ceramic capacitors are both three.

[0029] In the above technical solution, the conductive part of the shell of the tubular ceramic capacitor includes a front section and a rear section along its axial direction, and the outer diameter of the front section is smaller than the outer diameter of the rear section.

[0030] The front end of each of the tubular ceramic capacitors is inserted into the rear end of the tubular segment located on its respective front side. Except for the first tubular segment, the front ends of the remaining tubular segments are connected to the rear ends of the tubular ceramic capacitors located on their respective front sides.

[0031] The tubular ceramic capacitor, with its two-section structure, facilitates both sealing of the rear end of the front section and connection to the rear section, significantly reducing the manufacturing cost and process difficulty of the filter device.

[0032] In the above technical solution, the outer diameter of the rear section is slightly larger than or equal to the outer diameter of the pipe section. This facilitates the connection between the pipe section and the rear section and also improves the overall aesthetics of the tubular ceramic capacitor after it is connected to the pipe fitting.

[0033] In the above technical solution, the front end of the first tube segment is welded to the rear end of the connector housing, and the front ends of the remaining tube segments are welded to the rear end of the tubular ceramic capacitor located on their respective front sides.

[0034] In the above technical solution, the rear end of each of the tube segments is welded to the rear end of the tubular ceramic capacitor located on its respective rear side.

[0035] That is, the connector housing, the tube segment, and the shell of the tubular ceramic capacitor are all connected by welding. This not only makes the operation simple and the connection firm, but also has good sealing performance, which can effectively ensure the electromagnetic shielding effect of the filtering device.

[0036] In the above technical solution, the rear end of the ceramic body of the tubular ceramic capacitor is welded to the first conductive element to fix the position of the tubular ceramic capacitor on the first conductive element.

[0037] In the above technical solution, the second conductive element is arranged parallel to the tubular component and welded to the rear section of at least one of the tubular segments and / or at least one of the tubular ceramic capacitors. This design not only enhances the stability of the second conductive element but also ensures the compact structure of the filtering device.

[0038] In the above technical solution, the front end of the first conductive element is welded to the conductive core of the connector, and the front end of the second conductive element is welded to the outer shell of the connector.

[0039] In the above technical solutions, all welding processes involve soldering. This is mainly because soldering is particularly suitable for soldering and fixing electronic components, effectively preventing damage to tubular ceramic capacitors. Furthermore, soldering also possesses excellent conductivity and strong connection properties.

[0040] In the above technical solution, the connector is any one of DC male connector, DC female connector, Type-C male connector, and Type-C female connector.

[0041] In the above technical solution, both the first conductive element and the second conductive element are conductive rods with appropriate rigidity, such as copper rods. This facilitates connection and fixation, and also helps to ensure that the first conductive element, which passes through the inside of the pipe, remains in a non-contact state with the pipe.

[0042] In the above technical solution, the pipe fitting is made of inexpensive and easy-to-process copper pipe.

[0043] The filtering device provided by the present invention is applied to a mobile phone shielding cabinet. The mobile phone shielding cabinet includes a cabinet body and electrical equipment. The cabinet body has a shielding cavity inside, the electrical equipment is located in the shielding cavity, and the filtering device is installed on the cabinet plate of the cabinet body that forms the shielding cavity.

[0044] In the above technical solution, the front end of the connector is exposed inside the cabinet panel, for mating with another connector connected to the electrical equipment. The rear ends of the first conductive element and the second conductive element are used to connect the power cord.

[0045] In other technical solutions, the front end of the connector is exposed on the outside of the cabinet panel, for mating with another connector connected to the power supply. The rear ends of the first conductive element and the second conductive element are electrically connected to the electrical equipment via wires.

[0046] In the above technical solution, any one or more of the connector housing, the tubular fitting, the housing of the tubular ceramic capacitor, and the second conductive element are grounded through the cabinet.

[0047] Compared with the prior art, the present invention has at least the following beneficial effects:

[0048] Firstly, the structural design is simpler and more practical, which not only reduces production difficulty and cost, improves cost-effectiveness, and brings higher economic benefits, but also effectively attenuates and absorbs communication signals entering the filter device from outside the mobile phone shielding cabinet and communication signals radiated from the first conductive component, thus effectively ensuring the shielding effect of the mobile phone shielding cabinet.

[0049] Secondly, the use of hollow magnetic beads and tubular ceramic capacitors in combination results in a more significant high-frequency filtering effect and a wider coverage bandwidth. This effectively attenuates communication signals in the power supply circuit, better meeting the practical application needs of mobile phone shielding cabinets.

[0050] Thirdly, it has stronger adjustment and expansion capabilities in terms of specifications. There is no need to redesign the structure. Different specifications of filter devices can be obtained simply by adjusting the number of tubes, tubular ceramic capacitors and hollow magnetic beads. It is more practical and has a wider range of applications. Attached Figure Description

[0051] Figure 1 This is one of the overall structural schematic diagrams of the mobile phone shielding cabinet in Embodiment 1 of the present invention.

[0052] Figure 2 This is the second schematic diagram of the overall structure of the mobile phone shielding cabinet in Embodiment 1 of the present invention.

[0053] Figure 3 for Figure 1 Enlarged view of a portion of region I

[0054] Figure 4 for Figure 2 Enlarged view of a section in region II

[0055] Figure 5 This is a schematic diagram of the overall structure of the filtering device according to Embodiment 1 of the present invention.

[0056] Figure 6 A schematic diagram showing hollow magnetic beads in the filtering device of Embodiment 1 of the present invention.

[0057] Figure 7This is a schematic diagram of the overall structure of the tubular ceramic capacitor in Embodiment 1 of the present invention.

[0058] Figure 8 This is a schematic diagram of the split structure of the filtering device in Embodiment 1 of the present invention.

[0059] Figure 9 This is a schematic diagram showing the arrangement of the tube segment and the tubular ceramic capacitor in Embodiment 1 of the present invention.

[0060] In the diagram: 100, cabinet; 101, shielding cavity; 102, cabinet panel; 200, cabinet door; 300, filter device; 1, connector; 11, outer shell; 2, pipe fitting; 21, pipe section; 21a, first pipe section; 21b, second pipe section; 21c, third pipe section; 3, first conductive component; 4, second conductive component; 5, hollow magnetic bead; 5a, first hollow magnetic bead; 5b, second hollow magnetic bead; 5c, third hollow magnetic bead; 6, tubular ceramic capacitor; 61, conductive part; 611, front section; 612, rear section; 62, ceramic body; 6a, first tubular ceramic capacitor; 6b, second tubular ceramic capacitor; 6c, third tubular ceramic capacitor. Detailed Implementation

[0061] The present invention will now be described in more detail with reference to specific embodiments. Those skilled in the art should understand that these descriptions merely illustrate some specific embodiments of the invention and do not limit the scope of the invention in any way.

[0062] To facilitate the description of the positional relationships between the components in the accompanying drawings, this document will use spatial relative orientation terms such as "front," "rear," "front end," and "rear end." It should be understood that spatial relative orientation not only covers the directions shown in the drawings but also includes various possible orientations in actual use and operation of the embodiments. For example, when the device in the drawings is inverted, a component originally described as being "in front" of other components will be reoriented to be "rear" of those components. Furthermore, the structures shown in the accompanying drawings are for illustrative purposes only and do not represent the actual structure of the invention, nor do they limit the scope of protection of the invention.

[0063] Furthermore, terms such as "first" and "second" in this document are not intended to emphasize the quantity, order, or importance of the components referred to. Unless otherwise stated, terms such as "installed," "connected," and "linked" in this document should be interpreted broadly. For example, they can refer to fixed connections, integral connections, or detachable connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art should understand the specific meaning of the above terms in this document according to the specific circumstances. In addition, terms such as "greater than," "less than," and "exceeding" in this document are understood to exclude the stated number; terms such as "above," "below," and "within" are understood to include the stated number; and "multiple" means two or more.

[0064] It should be emphasized that, in the various embodiments of the present invention, for each component of the filter device 300, "front" refers to the direction in which the connector faces, and "rear" refers to the opposite direction.

[0065] Example 1

[0066] See Figures 1 to 4 This embodiment provides a mobile phone shielding cabinet for storing electronic products with communication functions such as mobile phones, tablets, and laptops.

[0067] The mobile phone shielding cabinet includes a cabinet body 100, a cabinet door 200, electrical equipment (not shown), and a filtering device 300. Both the cabinet body 100 and the cabinet door 200 are made of metal. The cabinet body 100 has a shielding cavity 101 inside. The cabinet door 200 is hinged to the cabinet body 100. When the cabinet door 200 is closed, the shielding cavity 101 forms an electromagnetic shielding space. The electrical equipment is located in the shielding cavity 101. The filtering device 300 is installed on the cabinet panel 102 of the cabinet body 100 that forms the shielding cavity 101.

[0068] See Figures 1 to 7 The filter device 300 includes a connector 1, a tube 2, a first conductive element 3, a second conductive element 4, and a tubular ceramic capacitor 6. The front end of the connector 1 is exposed inside the cabinet panel 102, while the other components are located on the outside of the cabinet panel 102.

[0069] Connector 1 is a DC female connector used for mating with DC male connectors of electrical equipment. Connector 1 includes a metal housing 11 and a conductive core disposed therein, which are insulated from each other.

[0070] The fitting 2 is made of metal, and its front end is connected to the rear end of the housing 11 of the connector 1.

[0071] The first conductive element 3 passes through the inside of the tube 2 along the axial direction of the tube 2 and does not contact the tube 2. The front end of the first conductive element 3 is connected to the conductive core of the connector 1, and the rear end is used to connect the power cord (not shown).

[0072] The second conductive element 4 is located outside the tube 2, with its front end connected to the housing 11 of the connector 1, and its rear end also used to connect the power cord (not shown).

[0073] A tubular ceramic capacitor 6 is connected in series with the first conductive element 3, and at least one of them is sealed at the rear end of the tubular element 2. Specifically, the tubular ceramic capacitor 6 includes a ceramic body 62 and a shell covering the outer peripheral surface of the ceramic body 62. The ceramic body 62 is connected in series with the first conductive element 3 through its axial hole. The shell includes a conductive part 61, which is connected to the tubular element 2. The conductive part 61 is preferably made of metal.

[0074] Among them, the conductive core of connector 1 is used to connect to the positive terminal of the power supply, and any one or more of the outer shell 11 of connector 1, tube 2, shell of tubular ceramic capacitor 6, and second conductive element 4 are grounded through cabinet 100.

[0075] The tubular ceramic capacitor 6 is also known as a feedthrough capacitor or a C-type feedthrough filter. When high-frequency currents and signals on the first conductive element 3 pass through the tubular ceramic capacitor 6, they are directly bypassed to ground via its low-impedance path and thus effectively filtered out. However, low-frequency currents and signals on the first conductive element 3 are allowed to pass through smoothly, maintaining their integrity and not affecting the normal operation of the circuit. Therefore, the tubular ceramic capacitor 6 can effectively filter out some communication signals in the power supply circuit, preventing them from entering or exiting the mobile phone shielding cabinet.

[0076] The outer shell 11 of connector 1, the tube 2, and the shell of tubular ceramic capacitor 6 are all conductive. When the three are connected, they form a channel with a large aspect ratio. This channel can not only effectively attenuate and absorb communication signals entering the channel from the outside of the mobile phone shielding cabinet, but also effectively attenuate and absorb communication signals radiated from the first conductive component 3, preventing these communication signals from spreading to the shielding cavity 101, thereby ensuring that the shielding effect of the mobile phone shielding cabinet is not affected.

[0077] Based on the above structure, the filter device 300 in this embodiment not only performs excellently in high-frequency filtering and electromagnetic shielding, but also significantly reduces production difficulty and cost due to its simple and practical structural design, greatly improving its cost-effectiveness and bringing considerable economic benefits to mobile phone shielding cabinet manufacturers.

[0078] like Figure 6 and Figure 8 As shown, the filter device 300 in this embodiment also includes a hollow magnetic bead 5, which is strung on the first conductive member 3 through its axial hole and disposed inside the tube 2.

[0079] The hollow magnetic bead 5 is primarily composed of ferrite. For low-frequency currents and signals on the first conductive element 3, the hollow magnetic bead 5 exhibits low impedance and high permeability, allowing them to pass smoothly. Conversely, for high-frequency currents and signals on the first conductive element 3, the hollow magnetic bead 5 has high impedance and low permeability, preventing their passage. Therefore, the hollow magnetic bead 5 can effectively absorb and attenuate communication signals in the power supply circuit.

[0080] The hollow magnetic bead 5 and the tubular ceramic capacitor 6 are used in series on the first conductive component 3, which can not only greatly improve the high-frequency filtering efficiency, but also effectively broaden the filtering bandwidth. As a result, the power of the communication signal in the power supply circuit can be reduced to the level required by the mobile phone shielding cabinet, thus better meeting the actual application needs of the mobile phone shielding cabinet.

[0081] like Figure 6 and Figure 8 As shown, pipe 2 is a copper pipe, comprising three pipe sections 21 along its axial direction. The number of hollow magnetic beads 5 and tubular ceramic capacitors 6 is equal to that of pipe sections 21, with three of each. The three pipe sections 21 and the three tubular ceramic capacitors 6 are arranged alternately along the first conductive element 3, and adjacent pipe sections 21 and tubular ceramic capacitors 6 are interconnected. The three hollow magnetic beads 5 are correspondingly located inside the three pipe sections 21.

[0082] For ease of description, the three pipe sections 21 are respectively referred to as the first pipe section 21a, the second pipe section 21b, and the third pipe section 21c; the three hollow magnetic beads 5 are respectively referred to as the first hollow magnetic bead 5a, the second hollow magnetic bead 5b, and the third hollow magnetic bead 5c; and the three tubular ceramic capacitors 6 are respectively referred to as the first tubular ceramic capacitor 6a, the second tubular ceramic capacitor 6b, and the third tubular ceramic capacitor 6c.

[0083] The front end of the first tube segment 21a is connected to the rear end of the housing 11 of the connector 1. A first hollow magnetic bead 5a is disposed inside the first tube segment 21a. A first tubular ceramic capacitor 6a is correspondingly sealed at the rear end of the first tube segment 21a, and the conductive part 61 of the housing of the first tubular ceramic capacitor 6a is connected to the rear end of the first tube segment 21a. The front end of the second tube segment 21b is connected to the conductive part 61 of the housing of the first tubular ceramic capacitor 6a. A second hollow magnetic bead 5b is disposed inside the second tube segment 21b. A second tubular ceramic capacitor 6b is correspondingly sealed at the rear end of the second tube segment 21b, and the conductive part 61 of the housing of the second tubular ceramic capacitor 6b is connected to the rear end of the second tube segment 21b. The front end of the third tube segment 21c is connected to the conductive part 61 of the shell of the second tubular ceramic capacitor 6b. The third hollow magnetic bead 5c is disposed inside the third tube segment 21c. The third tubular ceramic capacitor 6c is correspondingly sealed at the rear end of the third tube segment 21c, and the conductive part 61 of the shell of the third tubular ceramic capacitor 6c is connected to the rear end of the third tube segment 21c.

[0084] The first tube segment 21a, the first hollow magnetic bead 5a, and the first tubular ceramic capacitor 6a form the first filter unit; the second tube segment 21b, the second hollow magnetic bead 5b, and the second tubular ceramic capacitor 6b form the second filter unit; and the third tube segment 21c, the third hollow magnetic bead 5c, and the third tubular ceramic capacitor 6c form the third filter unit. When the current and signal from the power supply flow through the first conductive element 3, they pass sequentially through the third filter unit, the second filter unit, and the first filter unit, and are then transmitted to the power-consuming equipment via connector 1. During this process, the mobile phone communication signal is effectively attenuated and / or filtered out, and its power is reduced to the level required by the mobile phone shielding cabinet, thereby ensuring that the mobile phone inside the shielding cabinet cannot establish a normal communication connection with the outside world.

[0085] like Figures 7 to 9 As shown, the conductive portion 61 of the casing of the tubular ceramic capacitor 6 includes a front section 611 and a rear section 612 along its axial direction, with the outer diameter of the front section 611 being smaller than the outer diameter of the rear section 612. The front section 611 of the first tubular ceramic capacitor 6a is inserted into the rear end of the first tubular section 21a, and the front end of the second tubular section 21b is connected to the rear section 612 of the first tubular ceramic capacitor 6a; the front section 611 of the second tubular ceramic capacitor 6b is inserted into the rear end of the second tubular section 21b, and the front end of the third tubular section 21c is connected to the rear section 612 of the second tubular ceramic capacitor 6b; the front section 611 of the third tubular ceramic capacitor 6c is inserted into the rear end of the third tubular section 21c.

[0086] The tubular ceramic capacitor 6, with its two-section structure, is easy to seal at the rear end of its front section 21 and easy to connect to the rear section 21, which significantly reduces the manufacturing cost and process difficulty of the filter device 300.

[0087] The outer diameter of the rear section 612 of the tubular ceramic capacitor 6 is slightly larger than or equal to the outer diameter of the tube section 21. This facilitates the connection between the tube section 21 and the rear section 612, and also improves the overall aesthetics of the tubular ceramic capacitor 6 and the tube 2 after they are connected as one unit.

[0088] In this embodiment, the outer shell 11 of the connector 1, the tube segment 21, and the shell of the tubular ceramic capacitor 6 are all connected by welding. This not only makes the operation simple and the connection firm, but also has good sealing performance, which can effectively ensure the electromagnetic shielding effect of the filter device 300.

[0089] Specifically, the front end of the first tube segment 21a is welded to the rear end of the housing 11 of the connector 1, and the rear end of the first tube segment 21a is welded to the rear section 612 of the first tubular ceramic capacitor 6a; the front end of the second tube segment 21b is welded to the rear section 612 of the first tubular ceramic capacitor 6a, and the rear end of the second tube segment 21b is welded to the rear section 612 of the second tubular ceramic capacitor 6b; the front end of the third tube segment 21c is welded to the rear section 612 of the second tubular ceramic capacitor 6b, and the rear end of the third tube segment 21c is welded to the rear section 612 of the third tubular ceramic capacitor 6c.

[0090] In this embodiment, the rear ends of the ceramic bodies 62 of the three tubular ceramic capacitors 6 are all welded to the first conductive element 3 to fix their positions on the first conductive element 3.

[0091] like Figure 5 and Figure 6 As shown, the second conductive element 4 is arranged parallel to the tube 2 and welded to the rear section 612 of the three tubular ceramic capacitors 6 to improve structural stability while maintaining the compactness of the filter device 300. Of course, the second conductive element 4 can also be welded to the three tube sections 21, or to both the tube sections 21 and the rear section 612 of the tubular ceramic capacitors 6. These solutions can all achieve the same technical effect.

[0092] In this embodiment, the front end of the first conductive element 3 is welded to the conductive core of the connector 1, and the front end of the second conductive element 4 is welded to the outer shell 11 of the connector 1.

[0093] In this embodiment, all soldering involved is tin soldering. This is mainly because tin soldering is particularly suitable for soldering and fixing electronic components, and can effectively avoid damage to the tubular ceramic capacitor 6. In addition, tin soldering also has excellent conductivity and strong connection characteristics.

[0094] In this embodiment, both the first conductive element 3 and the second conductive element 4 are copper conductive rods with appropriate rigidity. This facilitates connection and fixation, and also helps to ensure that the first conductive element 3, which passes through the inside of the tube 2, remains in a non-contact state with the tube 2.

[0095] Example 2

[0096] This embodiment provides another type of mobile phone shielding cabinet, which differs from the first embodiment only in that the installation direction of the filter device 300 is reversed. Specifically, connector 1 is a DC female connector, with its front end exposed on the outside of the cabinet panel 102, for mating connection with a DC male connector connected to the power supply; other components such as pipe 2, first conductive component 3, second conductive component 4, hollow magnetic bead 5, and tubular ceramic capacitor 6 are all located inside the cabinet panel 102, and the rear end of the first conductive component 3 and the rear end of the second conductive component 4 are electrically connected to the electrical equipment through wires.

[0097] During operation, current and signals from the power supply are transmitted to the first conductive component 3 via connector 1, and then sequentially pass through the first filter unit, the second filter unit, and the third filter unit before finally being transmitted to the electrical device. During this process, mobile phone communication signals are effectively attenuated and / or filtered out, reducing their power to the level required by the mobile phone shielding cabinet, thereby ensuring that mobile phones inside the cabinet cannot establish normal communication connections with the outside world.

[0098] Apart from the differences mentioned above, the other structures and technical effects provided in this embodiment are the same as those in Embodiment 1, and will not be repeated hereafter.

[0099] The above description is for illustrative purposes only and is not intended to limit the invention. It should be noted that those skilled in the art can make various improvements, modifications, and variations to the invention, but such improvements, modifications, and variations should all be considered to fall within the protection scope of the invention without departing from its spirit.

Claims

1. A filter device for mobile phone shielding, characterized in that, include: A connector comprising a metal housing and a conductive core disposed therein, the two being insulated from each other; the conductive core is used to connect to the positive terminal of a power supply, and the housing is used for grounding; A metal tubular fitting, the front end of which is connected to the rear end of the connector housing; A first conductive element passes through the interior of the tube along its axial direction, with its front end connected to the conductive core of the connector, and the first conductive element does not contact the tube. A second conductive element is disposed outside the tubular component, the front end of which is connected to the housing of the connector; A tubular ceramic capacitor is connected in series with the first conductive element, at least one of which is sealed at the rear end of the tubular element; the casing of the tubular ceramic capacitor includes a conductive portion, which is connected to the tubular element; The rear ends of the first conductive element and the second conductive element are used to connect to the power cord or to form an electrical connection with the electrical equipment through the wire.

2. The filtering device for mobile phone shielding according to claim 1, wherein, The pipe fitting includes one or more pipe sections along its axial direction; the number of tubular ceramic capacitors is equal to the number of pipe sections, and each tubular ceramic capacitor is sealed at the rear end of each pipe section. The conductive portion of the casing of each of the tubular ceramic capacitors is connected to the rear end of the tubular segment located on its front side. The front end of the first tube segment is connected to the rear end of the connector housing, and the front ends of the remaining tube segments are connected to the conductive portion of the housing of the tubular ceramic capacitor located on their respective front sides.

3. The filter device for mobile phone shielding according to claim 2, wherein, The conductive portion of the casing of the tubular ceramic capacitor includes a front section and a rear section along its axial direction, wherein the outer diameter of the front section is smaller than the outer diameter of the rear section. The front end of each of the tubular ceramic capacitors is inserted into the rear end of the tubular segment located on its front side; except for the first tubular segment, the front end of each of the remaining tubular segments is connected to the rear end of the tubular ceramic capacitor located on its front side.

4. The filtering device for mobile phone shielding as described in claim 3, characterized in that, The front end of the first tube segment is welded to the rear end of the connector housing, and the front ends of the remaining tube segments are welded to the rear end of the tubular ceramic capacitor located on their respective front sides.

5. The filtering device for mobile phone shielding as described in claim 3, characterized in that, The rear end of each of the tube segments is welded to the rear end of the tubular ceramic capacitor located on its respective rear side.

6. The filtering device for mobile phone shielding as described in any one of claims 1-5, characterized in that, The rear end of the ceramic body of the tubular ceramic capacitor is welded to the first conductive element.

7. The filtering device for mobile phone shielding as described in any one of claims 2-5, characterized in that, It also includes hollow magnetic beads strung on the first conductive element, which are disposed inside the pipe segment.

8. The filtering device for mobile phone shielding as described in claim 7, characterized in that, The number of hollow magnetic beads is equal to the number of pipe segments, and each hollow magnetic bead is disposed inside each pipe segment.

9. The filtering device for mobile phone shielding as described in any one of claims 3-5, characterized in that, The second conductive element is arranged parallel to the tube and is welded to at least one of the tube segments and / or the rear section of at least one of the tubular ceramic capacitors.

10. The filtering device for mobile phone shielding as described in claim 1, characterized in that, Both the first conductive element and the second conductive element are conductive rods.

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