WO2017113166A1 - Cavity filter, cover plate and pressing rivet threaded sleeve thereof - Google Patents

Abstract

Provided are a cavity filter, a cover plate and a pressing rivet threaded sleeve thereof. The cavity filter comprises a cavity (10), a resonance tube (20) arranged in the cavity, a cover plate (30) for sealing the cavity, and tuning screw rods (40) penetrating through the cover plate and extending into the resonance tube; a plurality of riveting holes (310) are provided on the cover plate; pressing rivet threaded sleeves (100) are pressed into the riveting holes; the tuning screw rods spirally match the pressing rivet threaded sleeves; the pressing rivet threaded sleeves comprise a threaded sleeve main body (110) and an anti-rotation section (120); the threaded sleeve main body is provided with an internal thread; and the anti-rotation section is arranged on the outer peripheral surface of the threaded sleeve main body and is used for preventing the radial rotation and axial movement of the pressing rivet threaded sleeve relative to the cover plate after the pressing rivet threaded sleeve is in press fit with the cover plate of the cavity filter. The pressing rivet threaded sleeve is smooth, has no burrs and has complete threads so that the cover plate is tightly fitted with the tuning screw rods, and an intermodulation index is better.

Description

Cavity filter, cover plate and rivet nut sleeve

[Technical Field]

The present invention relates to the field of communications equipment, and in particular, to a cavity filter, a cover plate, and a rivet nut sleeve thereof.

 【Background technique】

Filters are widely used in the field of communications as a frequency selective device, especially in the field of radio frequency communications. In a base station where the communication system completes signal transmission and reception, a filter is used to select a communication signal to filter out clutter or interference signals outside the frequency of the communication signal.

Currently, in mobile communication base station systems, cavity filters are commonly used to frequency select signals transmitted and received by the antenna. The cavity filter comprises a cavity and a cover plate, the cavity is provided with a plurality of cavities, and a bottom of each cavity is provided with a resonance tube, the resonance tube has a hollow interior, and corresponds to the resonance tube on the cover plate A screw hole is formed at a position, and a tuning screw cooperates with the screw hole and extends into the resonance tube. The tuning screw is adjusted to change the relative position with the resonance tube to achieve the purpose of adjusting the resonance frequency.

The function of the cover plate is to adjust the frequency index. The electric field magnetic field around the tuning screw is very large. In the prior art, the thread on the cover plate is generally processed by tap tapping. The tap tapping thread is not smooth and has burrs. Problems such as incomplete teeth make the cover plate and the tuning screw not closely matched, and the contact between the cover tooth and the screw tooth contact portion is not tight and the smoothness may result in poor intermodulation index.

In addition, the cover plate is usually made of aluminum alloy material, and the tuning screw is usually made of copper material. The hardness of the tuning screw of the copper material is greater than the hardness of the cover plate of the aluminum alloy material. When the tuning screw rotates relative to the cover plate, the tuning screw of the copper material may It will damage the thread on the cover of the aluminum alloy material.

 [Summary of the Invention]

The invention provides a cavity filter, a cover plate and a rivet screw sleeve thereof, so as to solve the problem that the cover plate is processed by tap tapping in the prior art, and the tap tapping thread is not smooth, there is burr, and the tooth is incomplete, so that the cover The board does not closely match the tuning screw, resulting in poor intermodulation index.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide a riveted screw sleeve, comprising:

The main body of the threaded sleeve is provided with internal threads;

An anti-rotation segment is disposed on an outer peripheral surface of the screw sleeve body for preventing the rivet nut sleeve from rotating radially relative to the cover plate after the rivet nut sleeve is pressed against the cover plate of the cavity filter .

According to a preferred embodiment of the present invention, the outer peripheral surface of the nut main body is adjacent to the side of the anti-rotation section, and the groove section and the convex disc section are sequentially disposed, and the diameter of the groove section is smaller than the anti-rotation section. Diameter, the diameter of the convex disk segment is larger than the diameter of the anti-rotation segment, and the convex disk segment acts on the portion of the cover plate when the crimping nut sleeve is pressed against the cover plate of the cavity filter Material, such that a portion of the material of the cover plate is squeezed into the groove segment to prevent the snail from being pressed after the rivet nut sleeve is pressed against the cover of the cavity filter The mouthpiece moves axially relative to the cover.

According to a preferred embodiment of the present invention, the outer peripheral surface of the nut body is adjacent to the other side of the anti-rotation section, and the cylindrical section has a diameter smaller than a diameter of the anti-rotation section.

According to a preferred embodiment of the present invention, the side of the cylindrical section is further provided with a circular table segment, and the diameter of the circular table segment is gradually reduced from the cylindrical segment to facilitate the pressing of the rivet nut sleeve into the cavity filter. Cover of the device.

According to a preferred embodiment of the invention, the anti-rotation section is a knurled section, a discretely disposed flange section or a gear section.

According to a preferred embodiment of the invention, the rivet nut sleeve is made of a lead brass material.

According to a preferred embodiment of the invention, the rivet nut sleeve is formed by turning.

According to a preferred embodiment of the invention, the internal thread is a threaded hole of 4 mm to 8 mm.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide a cover plate for covering a cavity of a cavity filter, and the cover plate is provided with a plurality of riveting holes, A plurality of rivet nut sleeves are press-fitted into the plurality of rivet holes, and the rivet nut sleeves prevent radial rotation and axial movement relative to the cover plate.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide a cavity filter, the cavity filter including a cavity, a resonance tube disposed in the cavity, and a cover of the cavity. a cover plate and a tuning screw extending through the cover plate and extending into the resonance tube, wherein the cover plate is provided with a plurality of rivet holes, and a plurality of rivet nut sleeves are press-fitted into the plurality of rivet holes The press rivet sleeve prevents radial rotation and axial movement relative to the cover plate, and the tuning screw is helically engaged with the rivet nut sleeve.

The invention has the beneficial effects that the rivet nut sleeve provided by the invention is smooth, burr-free and full of teeth, so that the cover plate and the tuning screw are closely matched, and the intermodulation index is better.

 [Description of the Drawings]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings may be obtained according to these drawings without any creative work, wherein:

1 is a perspective view showing the structure of a rivet nut sleeve according to a preferred embodiment of the present invention;

2 is a side view showing the structure of a rivet nut sleeve according to a preferred embodiment of the present invention;

3 is a schematic cross-sectional structural view of a rivet nut sleeve according to a preferred embodiment of the present invention;

Figure 4 is a schematic view of the preferred embodiment of the present invention before the press-fit nut sleeve is pressed into the cover;

Figure 5 is a schematic view of the press rivet sleeve of the preferred embodiment of the present invention after being pressed into the cover;

Figure 6 is a simplified schematic diagram of a cavity filter in accordance with a preferred embodiment of the present invention;

7 is a block diagram showing the structure of a radio remote device according to a preferred embodiment of the present invention.

【detailed description】

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 1 to FIG. 5 together, the present invention provides a rivet nut sleeve 100 which is generally tubular in shape and includes a nut body 110 and an anti-rotation section 120.

The nut body 110 is provided with a smooth internal thread; the anti-rotation segment 120 is disposed on the outer circumferential surface of the nut body 110, and is used to prevent the snail from being pressed after the rivet nut 100 and the cover 30 of the cavity filter are pressed together. The mouthpiece 100 rotates radially relative to the cover plate 30. The anti-rotation section 120 is a knurled section, a discretely disposed flange section or a gear section.

In the embodiment of the present invention, the outer peripheral surface of the nut body 110 is adjacent to the side of the anti-rotation section 120, and the groove section 130 and the convex disk section 140 are sequentially disposed.

The diameter of the groove segment 130 is smaller than the diameter of the anti-rotation segment 120, and the diameter of the flange segment 140 is larger than the diameter of the anti-rotation segment 120. When the rivet nut sleeve 100 is pressed against the cover plate 30 of the cavity filter, the convex disk The segment 140 acts on a portion of the material 320 (see FIG. 5) of the cover plate 30 such that a portion of the material 320 of the cover plate 30 is squeezed into the groove segment 130 for embossing the threaded sleeve 100 and the cavity filter. After the cover plate 30 is pressed, the rivet nut sleeve 100 is prevented from moving axially relative to the cover plate 30. The anti-rotation section 120, the groove section 130 and the convex disk section 140 on the surface of the nut body 110 ensure that the combination of the rivet nut sleeve 100 and the cover plate 30 is stable and reliable.

In the embodiment of the present invention, the outer peripheral surface of the nut body 110 is adjacent to the other side of the anti-rotation section 120, and the cylindrical section 150 is provided. The diameter of the cylindrical section 150 is smaller than the diameter of the anti-rotation section 120.

Preferably, the side of the cylindrical section 150 is further provided with a circular section 160, the diameter of which is gradually reduced from the cylindrical section 150 to facilitate pressing of the rivet nut 100 into the cover 30 of the cavity filter.

In order to improve the intermodulation index and avoid the influence of the screw burr, both ends of the internal thread are provided with a smooth chamfer 170.

In a preferred embodiment, the rivet nut sleeve 100 can be made of a lead brass material, preferably a Hpb59-3 type lead brass, and is made by turning, which is generally smooth and burr-free. Of course, the material of the rivet nut 100 is not limited to this.

The rivet nut sleeve 100 is machined by turning, and the threaded teeth are much smoother than the taps tapped by the tap. Hpb59-3 is a lead brass, which is the most easily machined brass material. The screw thread processed by the turning method can be closely matched with the screw of the tuning screw 40 to improve the intermodulation index. As a separate component, the rivet nut sleeve 100 is easy to achieve high machining accuracy, ensuring smooth and full teeth.

According to the specific product requirements, the internal thread of the rivet nut 100 can be 4mm-8mm, such as M4, M5 or M8 threaded holes and other specifications.

Referring to FIG. 4 and FIG. 6 together, the present invention further provides a cover 30 for covering the cavity 10 of the cavity filter. The cover 30 is provided with a plurality of riveting holes 310 and more. The other functioning holes and the like, the plurality of rivet holes 310 are press-fitted with the above-mentioned rivet nut sleeve 100, and the thickness of the cover plate 30 is preferably the same as the thickness of the rivet nut sleeve 100, and of course, the snail may be different. The dental sleeve 100 is spliced and matched with the rivet hole 310 to prevent radial rotation and axial movement of the rivet nut sleeve 100. The material of the cover plate 30 may be aluminum alloy or the like, and the rivet nut sleeve 100 is made of lead brass material. The hardness of the threaded sleeve 100 is greater than the hardness of the cover plate 30.

Referring to FIG. 6 together, the present invention further provides a cavity filter including a cavity 10, a resonance tube 20 disposed in the cavity 10, a cover 30 of the cover cavity 10, and a through cover. The cover plate 30 extends into the tuning screw 40 of the resonance tube 20, wherein the cover plate 30 is the above-mentioned cover plate 30, and is provided with a plurality of riveting holes 310 and a plurality of other functional hole grooves, etc., and the plurality of riveting holes 310 are pressed. The above-mentioned rivet nut sleeve 100 is provided. The thickness of the cover plate 30 is preferably the same as the thickness of the rivet nut sleeve 100. Of course, the rivet nut sleeve 100 can prevent radial rotation and axial movement relative to the cover plate 30. The tuning screw 40 is screw-fitted with the rivet nut sleeve 100 in the cover plate 30. The top of the tuning screw 40 is provided with a tool urging port 410, such as a hexagon socket. After the cavity filter is installed, the tool is applied to the tool. The urging screw 410 fine-tunes the tuning screw 40, and after the tuning screw 40 is adjusted, the tuning screw 40 is locked and fixed by the tightening nut 50 and the spacer 60. The tuning screw 40 is generally made of copper and has a hardness comparable to that of the rivet nut 100. When the two are relatively rotated, the problem that the tuning screw of the prior art copper material can damage the thread on the cover of the aluminum alloy material is less likely to occur.

The cavity filter provided by the invention can be applied to communication devices such as duplexers, combiners, towers and the like.

As shown in FIG. 7 , the present invention further provides a radio remote device including a radio frequency transceiver module, a power amplifier module, and the above filter, wherein the radio transceiver module is connected to the power amplifier module, and the power amplifier module Connected to the filter.

When the radio remote device works in the downlink time slot, the transmit signal from the two channels of the radio transceiver module enters the filter through the power amplifier module, and the filter completes the filtering on the transmit signal, and then the power is combined and transmitted to the antenna port.

When the radio remote device works in the uplink time slot, the signal received from the antenna port is filtered by the filter and then enters the power amplifier module, and then amplified by the power amplifier module and output to the corresponding receiving channel of the radio transceiver module.

In summary, those skilled in the art will readily appreciate that the rivet nut sleeve 100 provided by the present invention is smooth, burr-free, and full of teeth, so that the cover plate 30 and the tuning screw 40 are closely matched, and the intermodulation index is good.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation of the present invention and the contents of the drawings may be directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims (20)

1. A rivet nut sleeve characterized by comprising:

   The main body of the threaded sleeve is provided with internal threads;

   An anti-rotation segment is disposed on an outer peripheral surface of the screw sleeve body for preventing the rivet nut sleeve from rotating radially relative to the cover plate after the rivet nut sleeve is pressed against the cover plate of the cavity filter .
2. The rivet nut sleeve according to claim 1, wherein the outer peripheral surface of the nut body is adjacent to a side of the anti-rotation section, and a groove segment and a disk segment are sequentially provided, and the groove segment is The diameter of the anti-rotation section is smaller than the diameter of the anti-rotation section, and the diameter of the anti-rotation section is larger than the diameter of the anti-rotation section, and the convex-disc section is pressed together with the cover of the cavity filter. Acting on a portion of the material of the cover plate such that a portion of the material of the cover plate is squeezed into the groove segment to press the cover plate of the rivet nut and the cavity filter The rivet nut sleeve is prevented from moving axially relative to the cover plate.
3. The rivet sleeve according to claim 2, wherein the outer peripheral surface of the nut body is adjacent to the other side of the anti-rotation section, and the cylindrical section has a diameter smaller than the anti-rotation The diameter of the segment.
4. The rivet sleeve according to claim 3, wherein the side of the cylindrical section is further provided with a circular table segment, and the diameter of the circular table segment is gradually reduced from the cylindrical segment to facilitate the snail The mouthpiece is pressed into the cover of the cavity filter.
5. The rivet sleeve according to claim 4, wherein the anti-rotation section is a knurled section, a discretely disposed flange section or a gear section.
6. The rivet nut sleeve according to claim 5, wherein the rivet nut sleeve is made of a lead brass material.
7. The rivet nut sleeve according to claim 6, wherein the rivet nut sleeve is formed by turning.
8. The riveting nut sleeve according to claim 7, wherein the internal thread has a bore diameter of 4 mm to 8 mm.
9. A cover plate for a cavity filter, wherein the cover plate is used for covering a cavity of the cavity filter, the cover plate is provided with a plurality of riveting holes, and the plurality of riveting holes are pressed into the cavity There are a plurality of rivet nut sleeves, and the rivet nut sleeve is press-fitted with the rivet hole to prevent radial rotation and axial movement of the rivet nut sleeve.
10. The cover of claim 9 comprising:

    The main body of the threaded sleeve is provided with internal threads;

    An anti-rotation segment is disposed on an outer peripheral surface of the screw sleeve body for preventing the rivet nut sleeve from rotating radially relative to the cover plate after the rivet nut sleeve is pressed against the cover plate of the cavity filter .
11. The cover plate according to claim 10, wherein the outer peripheral surface of the nut body is adjacent to the side of the anti-rotation section, and the groove section and the disc section are sequentially provided, and the diameter of the groove section Less than the diameter of the anti-rotation segment, the diameter of the convex disk segment is larger than the diameter of the anti-rotation segment, and the convex disk segment acts on the pressing plate sleeve when pressed against the cover plate of the cavity filter Part of the material of the cover plate such that a portion of the material of the cover plate is squeezed into the groove segment to press the rivet nut sleeve with the cover of the cavity filter The rivet nut sleeve is prevented from moving axially relative to the cover plate.
12. The cover plate according to claim 11, wherein the outer peripheral surface of the nut main body is adjacent to the other side of the anti-rotation section, and the cylindrical section has a diameter smaller than the anti-rotation section. diameter of.
13. The cover plate according to claim 12, wherein the side of the cylindrical section is further provided with a circular table section, and the diameter of the circular stage section is gradually reduced from the cylindrical section to facilitate the pressing of the rivet nut Into the cover of the cavity filter.
14. The cover according to claim 13, wherein the anti-rotation section is a knurled section, a discretely disposed flange section or a gear section.
15. The cover according to claim 14, wherein said rivet nut is a smooth burr-free member made of a lead brass material and machined by turning.
16. A cavity filter, comprising: a cavity, a resonance tube disposed in the cavity, a cover covering the cavity, and extending through the cover and extending into the cavity a tuning screw of the resonance tube, wherein the cover plate is provided with a plurality of rivet holes, a plurality of rivet nut sleeves are press-fitted into the plurality of rivet holes, and the rivet nut sleeve is riveted with the rivet hole Cooperating to prevent radial rotation and axial movement, the tuning screw is helically mated with the rivet nut sleeve.
17. The cavity filter of claim 16 comprising:

    The main body of the threaded sleeve is provided with internal threads;

    An anti-rotation segment is disposed on an outer peripheral surface of the screw sleeve body for preventing the rivet nut sleeve from rotating radially relative to the cover plate after the rivet nut sleeve is pressed against the cover plate of the cavity filter .
18. The cavity filter according to claim 17, wherein a side of the outer peripheral surface of the nut body adjacent to the anti-rotation section is sequentially provided with a groove segment and a convex disk segment, and the groove segment The diameter of the anti-rotation section is smaller than the diameter of the anti-rotation section, and the diameter of the anti-rotation section is larger than the diameter of the anti-rotation section, and the convex-disc section is pressed together with the cover of the cavity filter. Acting on a portion of the material of the cover plate such that a portion of the material of the cover plate is squeezed into the groove segment to press the cover plate of the rivet nut and the cavity filter The rivet nut sleeve is prevented from moving axially relative to the cover plate.
19. The cavity filter according to claim 18, wherein the outer peripheral surface of the nut main body is adjacent to the other side of the anti-rotation section, and the cylindrical section has a diameter smaller than the anti-rotation The diameter of the segment.
20. The cavity filter according to claim 19, wherein the side of the cylindrical section is further provided with a circular section, the diameter of the circular section being gradually reduced from the cylindrical section to facilitate the snail The mouthpiece is pressed into the cover of the cavity filter.