Cavity filter capable of preventing loosening

Abstract

The utility model discloses a cavity filter capable of preventing loosening, which comprises a cavity, a resonator, an adjusting screw assembly and a cover plate, and is characterized in that the cover plate covers the opening end of the cavity; a first riveting part is arranged on the cavity or the cover plate; a second riveting part is arranged on the resonator, and the first riveting part and the second riveting part are riveted together, so that the resonator is connected to the cavity or the cover plate; the adjusting screw assembly is arranged on the cover plate or the cavity and is opposite to the resonator; through the structure, the first riveting part and the second riveting part generate plastic permanent deformation and are tightly combined, and the deformation area and the material expansion deformation direction are irregularly distributed, so that the resonator and the cavity or the cover plate can also be permanently fastened under severe conditions such as high and low temperature, vibration and the like.

Description

Technical Field

[0001] The utility model relates to the field of cavity filters, in particular to a cavity filter capable of preventing loosening. Background Art

[0002] The resonator is an important component of the cavity filter. The capacitance formed by its top and the cover can be understood as the termination capacitance in the equivalent circuit. The resonator and the distance between the top of the resonator and the cover determine the frequency of the cavity resonance.

[0003] In the existing cavity filter, there are three ways to connect the resonator and the cavity: 1. Figure 1 (a), the resonator and the screw are integrally formed and then connected to the cavity thread; 2, refer to Figure 1 (b), the resonator and the cavity are soldered with solder paste; 3. Figure 1 (c) The resonator and the cavity are connected by a split screw thread. When the above connection method is used in some extreme environments, the resonator may still become loose. When the connection between the resonator and the cavity fails, the loss, intermodulation, standing wave and other indicators of the filter will deteriorate, leading to product failure.

[0004] Therefore, there is an urgent need for a cavity filter that can prevent loosening to solve the above problems. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a cavity filter that can prevent loosening.

[0006] An embodiment of the utility model solves the technical problem by adopting a technical solution: a cavity filter capable of preventing loosening, comprising a cavity, a resonator, a screw adjustment component and a cover plate, wherein the cover plate is arranged on the opening end of the cavity;

[0007] A first riveting portion is provided on the cavity or the cover plate;

[0008] The resonator is provided with a second riveted portion, and the first riveted portion and the second riveted portion are riveted together so that the resonator is connected to the cavity or the cover plate;

[0009] The adjusting screw assembly is arranged on the cover plate or the cavity and is arranged opposite to the resonator.

[0010] As one of the preferred embodiments of the utility model, the first riveted portion is configured as a first riveted ring, and the second riveted portion is configured as a second riveted ring which is folded toward the inner side of the resonator and has a diameter larger than the first riveted ring, so that the second riveted ring is sleeved on the outer side of the first riveted ring and riveted together when the resonator abuts against the cavity or the cover plate.

[0011] As one of the preferred embodiments of the utility model, a resonance platform is arranged on the cavity or the cover plate, and the first riveted ring is arranged on the resonance platform.

[0012] As one of the preferred embodiments of the utility model, the first riveted ring is located in the longitudinal projection of the resonance platform and there is a distance between the outer side surface of the first riveted ring and the outer side surface of the resonance platform to form a limiting step for limiting the resonator.

[0013] As one of the preferred embodiments of the present utility model, the resonator includes a plurality of sheet metal resonant plates.

[0014] As one of the preferred embodiments of the present utility model, the cavity is made by sheet metal technology.

[0015] The beneficial effects of the utility model are as follows: a cavity filter capable of preventing loosening comprises a cavity, a resonator, an adjusting screw assembly and a cover plate, wherein the cover plate is arranged on the opening end of the cavity; a first riveted portion is arranged on the cavity or the cover plate; a second riveted portion is arranged on the resonator, and the first riveted portion and the second riveted portion are riveted together to connect the resonator to the cavity or the cover plate; the adjusting screw assembly is arranged on the cover plate or the cavity and is arranged opposite to the resonator; through the above structure, the first riveted portion and the second riveted portion produce plastic permanent deformation, the two are tightly combined, and the deformation area and the material expansion deformation direction are irregularly distributed, so that the resonator and the cavity or the cover plate can be permanently fastened under harsh conditions such as high and low temperatures and vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 It is a schematic diagram of the structure of the resonator and the cavity in the existing cavity filter;

[0018] Figure 2 This is a first structural schematic diagram of the cavity and the resonator in the utility model;

[0019] Figure 3 This is a second structural schematic diagram of the cavity and the resonator in the utility model;

[0020] Figure 4 It is a cross-sectional view of the cavity and the resonator in the utility model before riveting;

[0021] Figure 5 It is a cross-sectional view of the cavity and the resonator in the utility model during riveting;

[0022] Figure 6 This is a cross-sectional view of the cavity and the resonator in the utility model after riveting. DETAILED DESCRIPTION

[0023] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0024] In the description of the present utility model, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 the present invention.

[0026] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0027] Reference Figures 2 to 6 , a cavity filter capable of preventing loosening, comprising a cavity 10, a resonator 20, a screw adjustment assembly and a cover plate, wherein the cover plate is arranged on an open end of the cavity 10;

[0028] A first riveting portion 30 is provided on the cavity 10 or the cover plate;

[0029] The resonator 20 is provided with a second riveted portion 40, and the first riveted portion 30 and the second riveted portion 40 are riveted together so that the resonator 20 is connected to the cavity 10 or the cover plate;

[0030] The adjusting screw assembly is disposed on the cover plate or the cavity 10 and is arranged opposite to the resonator 20 .

[0031] In the present invention, the resonator 20 is installed on the cavity 10, and the adjusting screw assembly is installed on the cover plate and arranged relative to the resonator 20 as an example; specifically, the cavity 10 is first fixed on the fixture, and then the resonator 20 is placed in the cavity 10 and the second riveted portion 40 on the resonator 20 is docked with the first riveted portion 30 located on the resonance platform 50. When the first riveted portion 30 is set as the first riveted ring 31 and the second riveted portion 40 is set as the second riveted ring 32, the second riveted ring 32 is sleeved on the outer side of the first riveted ring 31 when the resonator 20 is abutted against the resonance platform 50, and a minimum distance between the first riveted ring 31 and the second riveted ring 32 is required. gap to improve assembly accuracy; when riveting, the crimping ring 71 is first tightly crimped with the bottom of the resonator 30 (the outside of the second rivet ring 41) to ensure the height size and position accuracy of the resonator 20 on the resonance platform 50, to prevent the punch 72 from displacing the resonator during riveting, and then the punch 72 is used to rivet the first rivet ring 31 and the second rivet ring 32 together; the advantage of the utility model is that: through the above structure, the first riveted part and the second riveted part are plastically permanently deformed, the two are tightly combined, and the deformation area and the direction of material expansion deformation are irregularly distributed, so that the resonator and the cavity or cover plate can be permanently fastened under harsh conditions such as high and low temperature and vibration.

[0032] Preferably, the first riveted portion 30 is configured as a first riveted ring 31, and the second riveted portion 40 is configured as a second riveted ring 32 which is folded toward the inside of the resonator 20 and has a diameter larger than the first riveted ring 31, so that the second riveted ring 32 is sleeved on the outside of the first riveted ring 31 and riveted together when the resonator 20 abuts against the cavity 10 or the cover plate.

[0033] Preferably, a resonance platform 50 is provided on the cavity 10 or the cover plate, and the first riveted ring 31 is provided on the resonance platform 50 .

[0034] The first riveting ring 31 is located within the longitudinal projection of the resonance platform 50 and there is a distance between the outer side surface of the first riveting ring 31 and the outer side surface of the resonance platform 50 to form a limiting step 60 for limiting the resonator 20; the resonator 20, the crimping ring 71 and the punch 72 are riveted and limited by the limiting step 60, which is conducive to improving the accuracy.

[0035] Preferably, the resonator 20 includes a plurality of sheet metal resonant plates.

[0036] Preferably, the cavity 10 is made by sheet metal processing.

[0037] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A cavity filter capable of preventing loosening, comprising a cavity (10), a resonator (20), a screw adjustment assembly and a cover plate, wherein the cover plate is arranged on an open end of the cavity (10), and is characterized in that: The cavity (10) or the cover plate is provided with a first riveting portion (30); The resonator (20) is provided with a second riveted portion (40), and the first riveted portion (30) and the second riveted portion (40) are riveted together so that the resonator (20) is connected to the cavity (10) or the cover plate; The adjusting screw assembly is arranged on the cover plate or the cavity (10) and is arranged opposite to the resonator (20).

2. A cavity filter capable of preventing loosening according to claim 1, characterized in that: The first riveted portion (30) is configured as a first riveted ring (31), and the second riveted portion (40) is configured as a second riveted ring (32) folded toward the inside of the resonator (20) and having a diameter larger than the first riveted ring (31), so that the second riveted ring (32) is sleeved on the outside of the first riveted ring (31) and riveted together when the resonator (20) abuts against the cavity (10) or the cover plate.

3. A cavity filter capable of preventing loosening according to claim 2, characterized in that: A resonance platform (50) is arranged on the cavity (10) or the cover plate, and the first riveted ring (31) is arranged on the resonance platform (50).

4. A cavity filter capable of preventing loosening according to claim 3, characterized in that: The first riveted ring (31) is located within the longitudinal projection of the resonance platform (50), and there is a distance between the outer side surface of the first riveted ring (31) and the outer side surface of the resonance platform (50), so as to form a limiting step (60) for limiting the resonator (20).

5. The cavity filter capable of preventing loosening according to claim 1, characterized in that: The resonator (20) comprises a plurality of sheet metal resonant plates.

6. The cavity filter capable of preventing loosening according to claim 1, characterized in that: The cavity (10) is made by sheet metal processing.

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