Tuning structure of filter

Abstract

The utility model provides a tuning structure of a filter, which is arranged in a shell of the filter, and one end of the shell is detachably connected with a cover plate so as to seal a cavity in the shell; the other end of the shell protrudes in the cavity to form a resonance table for bearing the resonance column; the cover plate is provided with a tuning hole used for limiting the tuning screw rod, the surface of one end of the tuning screw rod is smooth, the other end of the tuning screw rod is matched with the tuning hole, when one end of the tuning screw rod penetrates through the tuning hole, one end of the tuning screw rod enters the cavity, and the other end of the tuning screw rod is matched with the tuning hole. And the tuning screw rod, the resonant column and the resonant table are coaxial. According to the utility model, the outer peripheral surface of the tuning screw is designed to form a smooth layer and an unsmooth layer, so that chippings generated by friction between the outer periphery of the tuning screw and the cover plate in the tuning process are prevented from entering the cavity.

Description

Technical Field

[0001] The utility model belongs to the technical field of filters, and in particular relates to a tuning structure of a filter. Background Art

[0002] In modern electronic devices, filters play a vital role and are often used to separate, select or suppress signals of specific frequencies. When processing multi-frequency signals, filters may generate new frequency components due to their nonlinear characteristics. These components are called intermodulation distortion. Intermodulation distortion signals may interfere with communication systems, affecting the transmission quality of signals and the performance of the system. Intermodulation performance is a key performance indicator to measure whether the filter can effectively suppress intermodulation distortion. During the operation of the filter, the debris generated after tuning will interfere with the intermodulation stability of the entire filter after entering the cavity inside the filter, which is not conducive to the normal operation of the filter. Utility Model Content

[0003] In order to solve the problem described in the background technology that during the operation of the filter, the debris generated after tuning will affect the intermodulation stability of the entire filter after entering the cavity inside the filter, the utility model proposes the following technical solution:

[0004] A tuning structure of a filter is arranged in a shell of the filter, one end of the shell is detachably connected to a cover plate to close a cavity in the shell; the other end of the shell protrudes in the cavity to form a resonance table that carries a resonance column; the cover plate is provided with a tuning hole for limiting a tuning screw, one end of the tuning screw has a smooth surface, and the other end of the tuning screw matches the tuning hole, when one end of the tuning screw passes through the tuning hole, one end of the tuning screw enters the cavity, and the tuning screw, the resonance column, and the resonance table are coaxial.

[0005] One end of the resonance column is detachably fixedly connected to the resonance table, the outer periphery of the other end of the resonance column extends toward the inner wall of the cavity, and a tuning cavity coaxial with the resonance table is provided in the resonance column.

[0006] Furthermore, the outer periphery of the fixed end of the tuning screw is threadedly connected to the nut, and the free end of the tuning screw penetrates into the cavity.

[0007] Furthermore, after the tuning screw rod penetrates into the cavity, one end of the tuning screw rod enters into the tuning cavity.

[0008] Furthermore, the tuning hole comprises a first layer and a second layer; wherein the inner wall of the first layer is provided with threads matching the tuning screw, and the inner wall of the second layer is smooth.

[0009] Furthermore, the central axis of the tuning screw coincides with the central axis of the housing.

[0010] Beneficial effect: The utility model forms two layers of smooth and rough outer circumference of the tuning screw by designing the outer circumference, thereby reducing the debris generated by the friction between the outer circumference of the tuning screw and the cover plate from entering the cavity during the tuning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a cross-sectional schematic diagram of a tuning structure of a filter according to an embodiment of the utility model. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and advantages of the present application clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0013] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0014] Figure 1 It is a cross-sectional schematic diagram of a tuning structure of a filter according to an embodiment of the utility model.

[0015] Reference Figure 1 According to an embodiment of the utility model, a tuning structure of a filter is arranged at a filter housing 1. Among them, one end of the housing 1 is detachably connected to the cover plate 2 to close the cavity 11 in the housing 1. The other end of the housing 1 protrudes on the inner wall of the cavity 11 to form a resonance table 12 for carrying the resonance column 3. A tuning hole 21 for limiting the tuning screw 4 is provided on the cover plate 2. The surface of one end of the tuning screw 4 is smooth so as to reduce the friction resistance when contacting with the tuning hole 21 and ensure a smooth tuning process. The other end of the tuning screw 4 matches the shape and size of the tuning hole 21, so that the tuning screw 4 can smoothly pass through the tuning hole 21 into the cavity 11. When the tuning screw 4 passes through the tuning hole 21, it remains coaxial with the resonance column 3 and the resonance table 12.

[0016] Specifically, one end of the resonance column 3 is detachably fixedly mounted on the resonance platform 12, the outer periphery of the other end of the resonance column 3 extends toward the inner wall of the cavity 11, and the interior of the resonance column 3 is provided with a tuning cavity 31 coaxial with the resonance platform 12. The detachable method in this embodiment includes but is not limited to locking and connecting by fasteners such as bolts and screws. In the cross section of the housing 1 of the filter, the cavity 11, the tuning screw 4, and the cover plate 2 in the housing 1 are symmetrically distributed about the central axis of the resonance column 3.

[0017] Furthermore, the outer peripheral surface of the tuning screw 4 is divided into two parts, a smooth part and a threaded part, and the diameter of the smooth part of the tuning screw 4 is smaller than the diameter of the threaded part of the tuning screw 4. After the tuning screw 4 penetrates into the cavity 11 of the housing 1, the smooth part of the tuning screw 4 penetrates into the tuning cavity 31. Preferably, the end of the smooth part of the tuning screw 4 is processed to form a circular chamfer. In other embodiments, the end of the smooth part of the tuning screw 4 can also be hemispherical.

[0018] Furthermore, the tuning hole 21 is divided into a first layer and a second layer according to the distance from the cavity 11. The first layer is larger than the diameter of the second layer, and the first layer is located on the side away from the resonance platform 12. The second layer is located on the side close to the resonance platform 12. The inner wall of the first layer is provided with threads matching the outer circumference of the tuning screw 4, and the inner wall of the second layer is smooth. This facilitates the movement of the tuning screw 4 during the tuning process, and reduces the generation of debris during the movement of the tuning screw.

[0019] In summary, the utility model forms two layers of smooth and non-smooth by designing the outer circumference of the tuning screw, thereby reducing the debris generated by the friction between the outer circumference of the tuning screw and the cover plate from entering the cavity during the tuning process.

[0020] The above description is of certain embodiments of the invention. Other embodiments are within the scope of the following claims.

[0021] The terms "exemplary," "example," and the like used throughout this specification mean "used as an example, instance, or illustration" and do not mean "preferred" or "advantageous" over other embodiments. The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, these techniques can be implemented without these specific details. In some instances, in order to avoid obscuring the concepts of the described embodiments, well-known structures and devices are shown in block diagram form.

[0022] The optional implementation modes of the embodiments of the utility model are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the utility model are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the utility model, the technical scheme of the embodiments of the utility model can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the embodiments of the utility model.

[0023] The above description of the contents of this specification is provided to enable any person of ordinary skill in the art to implement or use the contents of this specification. Various modifications to the contents of this specification will be apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of protection of the contents of this specification. Therefore, the contents of this specification are not limited to the examples and designs described herein, but are consistent with the widest range of principles and novel features disclosed herein.

Claims

1. A filter tuning structure, arranged in a housing (1) of the filter, characterized in that: One end of the shell (1) is detachably connected to the cover plate (2) to close the cavity (11) in the shell (1); the other end of the shell (1) protrudes in the cavity (11) to form a resonance platform (12) that supports the resonance column (3); the cover plate (2) is provided with a tuning hole (21) for limiting the tuning screw (4); one end of the tuning screw (4) has a smooth surface, and the other end of the tuning screw (4) matches the tuning hole (21); when one end of the tuning screw (4) passes through the tuning hole (21), one end of the tuning screw (4) enters the cavity (11), and the tuning screw (4), the resonance column (3) and the resonance platform (12) are coaxial.

2. A filter tuning structure according to claim 1, characterized in that: One end of the resonant column (3) is detachably fixedly connected to the resonant platform (12), the outer periphery of the other end of the resonant column (3) extends toward the inner wall of the cavity (11), and a tuning cavity (31) coaxial with the resonant platform (12) is provided in the resonant column (3).

3. A filter tuning structure according to claim 2, characterized in that: The outer periphery of the fixed end of the tuning screw (4) is threadedly connected to the nut (5), and the free end of the tuning screw (4) penetrates into the cavity (11).

4. A filter tuning structure according to claim 2, characterized in that: When the tuning screw (4) penetrates into the cavity (11), one end of the tuning screw (4) enters into the tuning cavity (31).

5. A filter tuning structure according to claim 4, characterized in that: The tuning hole (21) comprises a first layer and a second layer; wherein the inner wall of the first layer is provided with a thread matching the tuning screw (4), and the inner wall of the second layer is smooth.

6. A filter tuning structure according to claim 2, characterized in that: The central axis of the tuning screw (4) coincides with the central axis of the housing (1).

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