Tuning screw and filter

Abstract

The utility model discloses a tuning screw and a filter, and relates to the field of communication, the tuning screw comprises a rod body, the rod body comprises a tuning section and a threaded section, one end of the tuning section is connected with one end of the threaded section, the tuning section is used for extending into an external filter cavity, and the threaded section is used for adjusting the depth of the tuning section extending into the filter cavity; a tin filling runner is arranged in the threaded section, the inlet end of the tin filling runner is arranged at the end, away from the tuning section, of the threaded section, the outlet end of the tin filling runner is arranged on the side wall of the threaded section, and the tin filling runner is used for conveying welding flux to the position between the threaded end and the side wall of a screw hole of an external filter cover plate. The tuned tuning screw rod is fixed on the cover plate through tin soldering, the torque in the tuning process can be reduced very low, the number of metal scraps generated in the tuning process is reduced, the welding flux infiltrates the screw teeth and the nut, and the metal scraps can also be prevented from falling into the filter cavity. And meanwhile, after welding, the tuning screw rod is in full contact with the cover plate, so that the intermodulation influence caused by poor contact is reduced.

Description

Technical Field

[0001] This application relates to the field of communications, and in particular to a tuning screw and filter. Background Technology

[0002] Currently, coaxial cavity filters are commonly used in 5G mobile communication system base station filters. However, the contact between the tuning screw and the cover plate, and metal debris generated during tuning, are two key factors affecting filter intermodulation. Coaxial cavity filters typically use a threaded rod that engages with a screw hole on the cover plate and extends into the cavity for tuning. For example, a traditional coaxial cavity filter uses a combination of a cover plate screw hole, a screw, and a nut. During tuning, the screw is first turned to adjust its depth into the filter cavity. Once the desired depth is reached, the nut on the screw is turned to ensure tight contact with the cover plate, thus fixing the screw's position. The rotational friction between the screw and the cover plate threads generates a large amount of debris, which falls directly into the filter tuning device and is difficult to clean completely. This can easily cause performance issues during subsequent power testing and use. Furthermore, the threaded connection between the tuning screw and the cover plate results in insufficient contact, which can also lead to intermodulation problems. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a tuning screw that can significantly reduce metal debris generated during the tuning process and the intermodulation problem caused by poor contact between the tuning screw and the cover plate.

[0004] This application also proposes a filter having the above-described tuning screw.

[0005] In a first aspect, this application proposes a tuning screw, comprising: a rod body, the rod body including a tuning section and a threaded section, one end of the tuning section being connected to one end of the threaded section, the tuning section being used to extend into an external filter cavity, the threaded section being used to adjust the depth of the tuning section extending into the filter cavity, the threaded section having a soldering channel inside, the inlet end of the soldering channel being located at the end of the threaded section away from the tuning section, the outlet end of the soldering channel being located on the side wall of the threaded section, and the soldering channel being used to deliver flux between the threaded end and the screw hole side wall of the external filter cover plate.

[0006] The tuning screw according to the embodiments of this application has at least the following beneficial effects: The tuning screw in this embodiment adopts a hollow structure. After tuning, flux is directly delivered to the contact point between the tuning screw and the screw hole of the cover plate through the solder channel, ensuring stable and reliable welding. This application uses welding to fix the tuned tuning screw to the cover plate. Compared with the traditional threaded nut fastening method, after tuning, it no longer needs to rely on threaded nuts for fastening. Therefore, the torque during the tuning process can be reduced significantly, thereby greatly reducing the amount of metal debris generated during tuning. The flux wets the threads and nut, also preventing metal debris from falling into the filter cavity during subsequent use. Simultaneously, after welding, the tuning screw and cover plate are in full contact, reducing intermodulation effects caused by poor contact, thereby improving the filter performance.

[0007] According to some embodiments of this application, the soldering channel includes a vertical channel and a plurality of horizontal channels. The vertical channel is disposed within the threaded section along the axis of the rod body, and one end of the vertical channel is open at the end face of the threaded section. The horizontal channels are disposed within the threaded section, and the axis of the horizontal channels intersects the axis of the rod body. One end of the horizontal channel is open at the side wall of the threaded section, and the other end is connected to the vertical channel.

[0008] According to some embodiments of this application, there are two transverse flow channels located on the same straight line, and the axis of the transverse flow channel is perpendicular to the axis of the rod.

[0009] According to some embodiments of this application, the inlet end of the soldering channel is provided with a slot, the slot is connected to the inlet end, and the slot is used for external hand tools to engage, so as to drive the rod to rotate, thereby adjusting the depth of the tuning section extending into the filter cavity.

[0010] According to some embodiments of this application, the slot is hexagonal in shape.

[0011] According to some embodiments of this application, the tuning section and the threaded section are integrally formed structures.

[0012] Secondly, this application proposes a filter including the tuning screw described in any embodiment of the first aspect of this application. The filter of the embodiment has the same beneficial effects as the tuning screw of the first aspect embodiment.

[0013] According to some embodiments of this application, the filter further includes: a main body, the main body having a cavity inside, a mounting platform being provided at the bottom of the cavity, and a resonant column being provided on the mounting platform; a cover plate, the cover plate being fastened to the opening of the main body, and the cover plate having a threaded hole at a position corresponding to the resonant column; and a threaded segment passing through the threaded hole.

[0014] According to some embodiments of this application, the filter further includes a retaining nut, which is sleeved on the threaded section and engages with the threaded section. When the tuning section extends into the cavity to the required depth, the retaining nut is rotated so that the lower surface of the retaining nut abuts against the upper surface of the cover plate, thereby enhancing the retaining effect of the tuning screw.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a schematic diagram of the structure of the tuning screw according to an embodiment of this application;

[0018] Figure 2 This is a schematic cross-sectional view of the tuning screw according to an embodiment of this application;

[0019] Figure 3 This is a cross-sectional schematic diagram of the filter according to an embodiment of this application.

[0020] Figure label:

[0021] 100 rod body; 110 threaded section; 120 tuning section; 130 soldering channel; 131 inlet end; 132 outlet end; 133 vertical channel; 134 horizontal channel; 200 filter; 210 main body; 211 mounting platform; 212 resonant column; 220 cavity; 230 cover plate; 240 retaining nut. Detailed Implementation

[0022] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0023] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0024] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0025] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0026] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] In existing technologies, the rotational friction between the screw and the cover plate generates a large amount of debris, which falls directly into the filter tuning device and is difficult to clean completely. This can easily cause performance issues during subsequent power testing and use. Furthermore, the threaded connection between the tuning screw and the cover plate results in insufficient contact, which can lead to intermodulation interference.

[0028] Therefore, this application provides a tuning screw and filter that can solve the problems existing in the prior art. The technical solutions provided in this application will be described in detail below.

[0029] Firstly, this application provides a tuning screw, such as Figure 1As shown, the tuning screw in this embodiment includes a rod body 100, which includes a tuning section 120 and a threaded section 110. One end of the tuning section 120 is connected to one end of the threaded section 110, and the two are coaxially connected. The tuning section 120 is used to extend into the cavity 220 of the external filter 200. The threaded section 110 has threads on its periphery and can be fitted into the threaded hole of the cover plate 230 of the external filter 200. By tightening the threaded section 110, the depth to which the tuning section 120 extends into the cavity 220 of the external filter 200 is controlled. The threaded section 110 is also provided with a soldering channel 130. The inlet end 131 of the soldering channel 130 is located at the end of the threaded section 110 away from the tuning section 120, and the outlet end 132 of the soldering channel 130 is located on the side wall of the threaded section 110. The soldering channel 130 is used to deliver flux to the threaded end and the screw hole side wall of the external filter cover plate 230.

[0030] After rotating the threaded section 110 to allow the tuning section 120 to extend into the filter cavity 220 to a suitable depth, molten solder is poured in from the inlet end 131 of the soldering channel 130, and flows out from the outlet end 132 of the soldering channel 130. The soldering channel 130 delivers solder between the threaded end and the screw hole sidewall of the outer filter cover plate 230, thereby welding the two together. In this embodiment, the tuning screw is fixed to the cover plate 230 by welding. Compared with the traditional threaded nut fastening method, after tuning, it is no longer necessary to rely on threaded nuts for fastening, so the torque during the tuning process can be reduced significantly, thereby greatly reducing the amount of metal debris generated during the tuning process. The flux wets the threads and nut, which also prevents metal debris from falling into the filter cavity 220 during subsequent use. At the same time, after welding, the tuning screw and the cover plate 230 are in full contact, reducing the intermodulation effect caused by poor contact, thereby improving the performance of the filter 200.

[0031] In some embodiments, the solder filling channel 130 includes a vertical channel 133 and a plurality of horizontal channels 134. The vertical channel 133 is disposed within the threaded section 110 along the axis of the rod 100, with one end opening at the end face of the threaded section 110, serving as the solder inlet 131. The horizontal channels 134 are disposed within the threaded section 110, with their axis intersecting the axis of the rod 100. One end of the horizontal channel 134 opens at the sidewall of the threaded section 110, and the other end communicates with the channel. After entering the solder filling channel 130 from the inlet 131, the solder first flows along the vertical channel 133, then enters the horizontal channels 134, and finally reaches the sidewall of the threaded section 110. Dividing the solder filling channel 130 into horizontal channels 134 and vertical channels 133 facilitates manufacturing and allows control over the position of the solder reaching the sidewall of the threaded section 110.

[0032] Optional, such as Figure 2 Two transverse flow channels 134 are configured, located on the same straight line, with the axis of the transverse flow channel 134 perpendicular to the axis of the rod body 100. Compared to having only one transverse flow channel, two transverse flow channels increase the outlet path of the molten solder, making it easier and more fully flowed to the sidewall of the screw hole. Simultaneously, because each additional transverse flow channel creates more space within the rod body, which may weaken the overall strength of the rod body, the impact of two transverse flow channels on the structural strength of the tuning screw is relatively small compared to having a larger number of transverse flow channels. Therefore, by having two transverse flow channels located on the same straight line, a balance can be achieved between the flowability of the molten solder and the structural strength.

[0033] like Figure 1 As shown, the inlet end 131 of the solder pouring channel 130 is provided with a slot, which is formed by deforming the side wall of the inlet end 131 of the solder pouring channel 130. Optionally, the slot is hexagonal, and an external hand tool can engage with the slot to drive the rod 100 to rotate, thereby adjusting the depth of the resonant end of the rod 100 into the filter cavity 220.

[0034] Understandably, the tuning section 120 and the threaded section 110 are integrally formed structures.

[0035] Secondly, this application also provides a filter 200, wherein the filter 200 of the embodiment includes any of the embodiments described in the first aspect regarding the tuning screw. The function and principle of the filter 200 of this embodiment are both based on the tuning screw; therefore, the filter 200 of this embodiment has the same beneficial effects as the tuning screw of the first aspect embodiment.

[0036] Specifically, such as Figure 3 As shown, in some embodiments, the filter 200 further includes: a main body 210, the interior of which is provided with a cavity 220, and a mounting platform 211 is provided inwardly at the bottom of the cavity 220, on which a resonant post 212 is provided; a cover plate 230, which is fastened to the opening of the main body 210, and the cover plate 230 is provided with a threaded hole at a position corresponding to the resonant post 212; and a threaded section 110 of a first aspect tuning screw passes through the threaded hole.

[0037] like Figure 3 As shown, in some embodiments, the filter 200 further includes a retaining nut 240, which is sleeved on the threaded section 110 and engages with the threaded section 110 of the tuning screw in the first aspect embodiment. When the tuning section 120 extends into the cavity 220 to the required depth, the retaining nut 240 is rotated so that the lower surface of the retaining nut 240 abuts against the upper surface of the cover plate 230 to further enhance the retaining effect of the tuning screw.

[0038] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A tuning screw, characterized by, The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter.

2. The tuned screw of claim 1, wherein: The application relates to a tuning screw rod for an external filter.

3. The tuned screw of claim 2, wherein: The application relates to a tuning screw rod for an external filter.

4. The tuned screw of claim 1, wherein: The application relates to a tuning screw rod for an external filter.

5. The tuned screw of claim 4, wherein: The application relates to a tuning screw rod for an external filter.

6. The tuned screw of claim 1, wherein: The application relates to a tuning screw rod for an external filter.

7. A filter, characterized by The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter.

8. The filter of claim 7, wherein, The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter.

9. The filter of claim 8, wherein: The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter. The application relates to a tuning screw rod for an external filter. 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