Filter capable of reducing metal scraps

Abstract

The utility model discloses a filter capable of reducing metal scraps. The filter comprises a debugging screw penetrating through a threaded through hole of a debugging cover plate, and a nut in threaded connection with the outer end of the debugging screw, the debugging screw rod is a rubber-coated debugging screw rod and comprises a metal columnar main body and a metal thread section which extends downwards from the upper end of the metal columnar main body, extends to the upper half part of the inner ring of the nut from the bottom end and is in thread fit with the nut; the rubber coating thread section is coated on the peripheral surface of the metal columnar main body, extends upwards from the lower end of the metal columnar main body, extends to the upper half part of the inner ring of the nut from the top end and is in threaded fit with the nut and the thread through hole. According to the filter provided by the utility model, metal chippings generated between the debugging screw rod and the debugging cover plate in the repeated debugging process of the filter can be extremely few, and the time for dismounting the cover and cleaning can be reduced; and metal scraps are extremely few, so that the intermodulation passing rate is further improved, the production time can be greatly saved, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a filter that can reduce metal debris. Background Technology

[0002] The tuning performance of duplex filters primarily relies on tuning screws on the tuning cover. Currently, the industry standard involves screwing tuning screws onto the tuning cover and repeatedly adjusting the depth of each screw's insertion into the cavity to achieve the required electrical performance specifications. However, with increasingly stringent design requirements for communication products, particularly regarding RF electrical performance and intermodulation, conventional tuning screws are no longer sufficient. Repeated tuning leads to a buildup of debris inside the cavity due to the threaded engagement between the tuning screws and the tuning cover. This debris is a critical factor affecting intermodulation, unavoidable with conventional tuning screws. Furthermore, disassembling and cleaning the cover is a tedious and time-consuming process, often requiring further fine-tuning after closing to fully meet electrical performance specifications. The problem of debris entering the cavity due to the threaded engagement of the tuning screws and tuning cover persists, resulting in low production efficiency and a low product yield. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a filter that can reduce metal debris, comprising: a cavity, an adjustment cover plate disposed on the top of the cavity, a vertical threaded through hole opened on the adjustment cover plate, an adjustment screw rod passing through the threaded through hole, and a nut threadedly connected to the outer end of the adjustment screw rod.

[0004] The adjusting screw is a rubber-coated adjusting screw; the rubber-coated adjusting screw includes: a metal cylindrical body, a metal threaded section extending downward from the upper end of the metal cylindrical body and extending to the upper half of the inner ring of the nut, which is threaded with the nut, and a rubber-coated threaded section covering the outer circumference of the metal cylindrical body, extending upward from the lower end of the metal cylindrical body and extending to the upper half of the inner ring of the nut, which is threaded with the nut and the threaded through hole.

[0005] Preferably, the nut is a stainless steel nut.

[0006] Preferably, the metal columnar body is a brass columnar body.

[0007] Preferably, the metal threaded section is a brass threaded section.

[0008] Preferably, the metal threaded segment is integrally connected to the metal columnar body.

[0009] Preferably, the overmolded threaded section is a polyetherimide (PEI) threaded section.

[0010] Preferably, the filter is a full-duplex filter.

[0011] The advantages and beneficial effects of this utility model are as follows: It provides a filter that can reduce metal debris, so that during repeated debugging of the filter, very little metal debris is generated between the debugging screw and the debugging cover, which can reduce the time for disassembling and cleaning; and the minimal metal debris further improves the intermodulation pass rate, which can greatly save production time and improve production efficiency.

[0012] The rubber-coated adjustment screw is screwed into the threaded through hole of the duplex filter adjustment cover plate. The rubber-coated threaded section of the adjustment screw engages with the threaded through hole of the adjustment cover plate, and the metal threaded section of the adjustment screw engages with the upper half of the nut. According to the adjustment specification that the adjustment screw must not be lower than the nut surface, the engagement of the metal threaded section with the upper half of the nut ensures that the adjustment screw is effectively grounded. Moreover, during the adjustment process, the metal threaded section of the adjustment screw will not contact the adjustment cover plate; the contact is entirely between the rubber-coated threaded section and the adjustment cover plate, which can prevent metal debris from entering the cavity during the adjustment process. This minimizes the amount of metal debris entering the cavity, reduces the time required for disassembly and cleaning, and further improves the intermodulation pass rate. This can greatly save production time, increase the intermodulation pass rate, and improve production efficiency. Attached Figure Description

[0013] Figure 1 This is an overall schematic diagram of the adjusting screw and nut;

[0014] Figure 2 It is a cross-sectional view of the adjusting screw and nut. Detailed Implementation

[0015] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0016] The specific technical solution of this utility model is as follows:

[0017] like Figure 1 and Figure 2 As shown, a filter that can reduce metal debris includes: a cavity, an adjustment cover plate disposed on the top of the cavity, a vertical threaded through hole opened on the adjustment cover plate, an adjustment screw rod passing through the threaded through hole, and a nut 1 threadedly connected to the outer end of the adjustment screw rod.

[0018] The adjusting screw is a rubber-coated adjusting screw 2; the rubber-coated adjusting screw 2 includes: a metal columnar body 21, a metal threaded section 22 extending downward from the upper end of the metal columnar body 21 and extending to the upper half of the inner ring of the nut 1, which is threaded with the nut 1, and a rubber-coated threaded section 23 covering the outer circumference of the metal columnar body 21, extending upward from the lower end of the metal columnar body 21 and extending to the upper half of the inner ring of the nut 1, which is threaded with the nut 1 and the threaded through hole;

[0019] The nut 1 is a stainless steel nut 1;

[0020] The metal columnar body 21 is a brass columnar body;

[0021] The metal threaded section 22 is a brass threaded section;

[0022] The metal threaded section 22 is integrally connected to the metal columnar body 21;

[0023] The rubber-coated threaded section 23 is a polyetherimide (PEI) threaded section;

[0024] The filter is a full-duplex filter.

[0025] Screw the rubber-coated adjustment screw 2 into the threaded through hole of the duplex filter adjustment cover plate. The rubber-coated threaded section 23 of the adjustment screw engages with the threaded through hole of the adjustment cover plate, and the metal threaded section 22 of the adjustment screw engages with the upper half of the nut 1. According to the adjustment specification that the adjustment screw must not be lower than the surface of the nut 1, the engagement of the metal threaded section 22 with the upper half of the nut 1 ensures that the adjustment screw is effectively grounded. Furthermore, during the adjustment process, the metal threaded section 22 of the adjustment screw will not contact the adjustment cover plate; the contact is entirely between the rubber-coated threaded section 23 and the adjustment cover plate. This prevents metal debris from entering the cavity during the adjustment process, resulting in very little metal debris entering the cavity, reducing the time required for disassembly and cleaning, and further improving the intermodulation pass rate. This can greatly save production time, increase the intermodulation pass rate, and improve production efficiency.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A filter capable of reducing metal debris, comprising: A cavity, an adjustment cover plate located at the top of the cavity, a vertical threaded through hole on the adjustment cover plate, an adjustment screw rod passing through the threaded through hole, and a nut threadedly connected to the outer end of the adjustment screw rod; characterized in that the adjustment screw rod is a rubber-coated adjustment screw rod; the rubber-coated adjustment screw rod includes: a metal columnar body, a metal threaded section extending downward from the upper end of the metal columnar body and extending to the upper half of the inner ring of the nut, which is threadedly engaged with the nut, and a rubber-coated threaded section covering the outer circumference of the metal columnar body, extending upward from the lower end of the metal columnar body and extending to the upper half of the inner ring of the nut, which is threadedly engaged with both the nut and the threaded through hole.

2. The filter for reducing metal debris according to claim 1, characterized in that, The nut is a stainless steel nut.

3. The filter for reducing metal debris according to claim 1, characterized in that, The metal columnar body is a brass columnar body.

4. The filter for reducing metal debris according to claim 1, characterized in that, The metal threaded section is a brass threaded section.

5. The filter for reducing metal debris according to claim 1, characterized in that, The metal threaded section is integrally connected to the metal columnar body.

6. The filter for reducing metal debris according to claim 1, characterized in that, The overmolded thread section is a polyetherimide (PEI) thread section.

7. The filter for reducing metal debris according to claim 1, characterized in that, The filter is a full-duplex filter.

Images