Cavity filter with self-locking tuning function

Abstract

The invention discloses a cavity filter with a self-locking tuning function, which comprises a cavity, a cover plate, a resonator, a fixed seat, a self-locking clamping piece and a debugging rod, and is characterized in that the cover plate is arranged at the opening end of the cavity, and the resonator is arranged in the cavity; the fixed seat is arranged on the cavity or the cover plate; a debugging through groove and a clamping groove communicated with the debugging through groove are formed in the fixed seat; the self-locking clamping piece is arranged in the clamping groove and provided with a deformation part arranged in the circumferential direction so that a self-locking space can be defined. The debugging rod is movably arranged in the debugging through groove and the self-locking space in a penetrating manner so as to change the distance between the end part of the debugging rod and the resonator; the self-locking clamping piece is arranged in the fixed seat to generate self-locking force for the debugging rod, and metal filings generated during relative movement of the debugging rod and the fixed seat can be well isolated, so that the metal filings are prevented from falling into the cavity to influence intermodulation indexes or power ignition, and the use requirements are met.

Description

Technical Field

[0001] The invention relates to the field of cavity filters, and in particular to a cavity filter with a self-locking tuning function. Background Art

[0002] Cavity filter is a very important filter. Compared with filters of other properties, it has the advantages of solid structure, stable and reliable performance, small size, moderate Q value, long high-end parasitic passband, and good heat dissipation performance. It can be used for larger power and frequency.

[0003] Reference Figure 1-2 In the existing cavity filter, the debugging nut 810 is riveted into the stepped through hole of the cover plate 200 by means of interference fit, the debugging nut 810 is provided with a threaded through hole, and the debugging screw 820 is extended into the cavity 100 through the thread rotation of the debugging nut 810. The debugging screw 820 is repeatedly screwed according to the change of the vector network analyzer graph until the performance of the filter meets the design requirements. It should be noted that the scheme sets left-right symmetrical and adjacent slots 830 on the debugging screw 820, the purpose of which is to make the debugging screw 820 prone to radial tensile deformation, thereby causing the pitch change, and then generating a certain self-locking force; however, this cavity filter has the following disadvantages:

[0004] 1. The debugging life of the debugging screw 820 is limited. Repeated stretching of the debugging screw 820 is prone to plastic deformation, the misaligned thread fit becomes loose, and the self-locking force decays to complete failure, which is also an unstable factor that leads to poor filter intermodulation;

[0005] 2. The tuning volume inner size of the debugging screw 820 is limited. Since the left and right symmetrical slots 830 of the debugging screw 820 are close to each other, that is, the position where the debugging screw 820 generates the self-locking force, the self-locking force cannot be generated at other positions;

[0006] 3. The self-locking force generated by the misalignment of the screw thread is limited and is greatly affected by the processing accuracy and matching tolerance, resulting in poor consistency of the preload force of the debugging screw 820 and easy loosening;

[0007] Therefore, there is an urgent need for a cavity filter with a self-locking tuning function to solve the above problems. Summary of the invention

[0008] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a cavity filter with a self-locking tuning function.

[0009] An embodiment of the present invention solves the technical problem by adopting a technical solution: a cavity filter with a self-locking tuning function, comprising a cavity, a cover plate and a resonator, wherein the cover plate is arranged at the opening end of the cavity, the resonator is arranged in the cavity, and further comprising a fixing seat, a self-locking card and a debugging rod;

[0010] The fixing seat is arranged on the cavity or the cover plate, and is provided with a debugging slot and a card slot communicating with the debugging slot;

[0011] The self-locking clamp is arranged in the clamping slot and is provided with circumferentially arranged deformation parts to enclose a self-locking space;

[0012] The debugging rod is movably arranged in the debugging slot and the self-locking space to change the distance between the end of the debugging rod and the resonator.

[0013] As one of the preferred embodiments of the present invention, an annular limiting platform for limiting the self-locking card in the slot is provided on the inner side wall of the slot away from the debugging through slot, and the debugging rod is passed through the annular limiting platform.

[0014] As one of the preferred embodiments of the present invention, it also includes a base mounted on the fixed seat to form an annular limiting platform.

[0015] As one of the preferred embodiments of the present invention, the self-locking clamp includes a first annular seat and a plurality of first elastic sheets arranged in the first annular seat along the circumference thereof and connected to the upper end of the first annular seat, the first elastic sheet constituting a deformation portion, and the first annular seat is provided with a first broken groove penetrating axially and radially so that the outer diameter of the first annular seat can be changed.

[0016] As one of the preferred embodiments of the present invention, a plurality of first elastic sheets enclose a self-locking space in the shape of an inverted frustum, and an angle between the first elastic sheet and the central axis of the self-locking clamp is less than 45°.

[0017] As one of the preferred embodiments of the present invention, the minimum inner diameter L1 of the inverted frustum-shaped self-locking space is smaller than the outer diameter L3 of the debugging rod.

[0018] As one of the preferred embodiments of the present invention, the self-locking clamp includes a second annular seat, the middle section of which is bent inward and is provided with a plurality of dividing grooves spaced along its circumference to define a plurality of second elastic sheets, the second elastic sheets constituting a deformation portion, and the second annular seat is provided with a second broken groove penetrating axially and radially to make the outer diameter of the second annular seat variable.

[0019] As one of the preferred embodiments of the present invention, a plurality of second elastic sheets enclose a waist-drum-shaped self-locking space, and the minimum inner diameter L4 of the waist-drum-shaped self-locking space is smaller than the outer diameter L3 of the debugging rod.

[0020] As one of the preferred embodiments of the present invention, the debugging rod is configured as a screw rod or a polished rod.

[0021] As one of the preferred embodiments of the present invention, the debugging rod includes a screw rod segment and a polished rod segment connected to the screw rod segment, and the polished rod segment extends into the cavity.

[0022] The beneficial effects of the present invention are as follows: a cavity filter with a self-locking tuning function, comprising a cavity, a cover plate and a resonator, wherein the cover plate is arranged at the open end of the cavity, the resonator is arranged in the cavity, and also comprises a fixing seat, a self-locking card and a debugging rod; the fixing seat is arranged on the cavity or the cover plate, and a debugging slot and a card slot connected to the debugging slot are arranged on the fixing seat; the self-locking card is arranged in the card slot and a circumferentially arranged deformation portion is arranged on it to enclose a self-locking space; the debugging rod is movably arranged in the debugging slot and the self-locking space to change the distance between its end and the resonator; a self-locking force is generated on the debugging rod by embedding a self-locking card in the fixing seat, and the metal chips generated when the debugging rod and the fixing seat move relative to each other can be well isolated to prevent them from falling into the cavity and affecting the intermodulation index or power sparking, thereby meeting the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 is an exploded view of an existing cavity filter;

[0025] Figure 2 is a cross-sectional view of an existing cavity filter;

[0026] Figure 3 It is an exploded view of a first embodiment of a cavity filter with a self-locking tuning function;

[0027] Figure 4 It is a cross-sectional view of a first embodiment of a cavity filter with a self-locking tuning function before debugging;

[0028] Figure 5 A cross-sectional view of a first embodiment of a cavity filter with a self-locking tuning function after debugging is completed;

[0029] Figure 6 It is a cross-sectional view of a part of the structure of a first embodiment of a cavity filter with a self-locking tuning function;

[0030] Figure 7 It is a structural schematic diagram of a first embodiment of a self-locking card;

[0031] Figure 8 It is an exploded view of the second embodiment of a cavity filter with a self-locking tuning function before debugging;

[0032] Fig. 9It is a structural schematic diagram of a second embodiment of a cavity filter with a self-locking tuning function during debugging;

[0033] Fig.10 It is a cross-sectional view of a second embodiment of a cavity filter with a self-locking tuning function before debugging;

[0034] Fig.11 A cross-sectional view of a second embodiment of a cavity filter with a self-locking tuning function during debugging;

[0035] Fig.12 A cross-sectional view of a second embodiment of a cavity filter with a self-locking tuning function after debugging is completed;

[0036] Fig.13 It is a cross-sectional view of a part of the structure of a first embodiment of a cavity filter with a self-locking tuning function;

[0037] Fig.14 It is a structural schematic diagram of a second embodiment of a self-locking card;

[0038] Fig.15 It is an exploded view of a third embodiment of a cavity filter with a self-locking tuning function;

[0039] Fig.16 This is a cross-sectional view of a third embodiment of a cavity filter with a self-locking tuning function after debugging. DETAILED DESCRIPTION

[0040] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention 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 present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0041] In the description of the present invention, the meaning of "above", "below", "exceed", etc. is not inclusive of the number itself, and the meaning of "above", "below", "within", etc. is inclusive of the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated 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 should not be understood as a limitation on the present invention.

[0043] 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.

[0044] Reference Figures 1 to 16 A cavity filter with a self-locking tuning function includes a cavity 100, a cover plate 200 and a resonator 300, wherein the cover plate 200 is arranged at the open end of the cavity 100, the resonator 300 is arranged in the cavity 100, and further includes a fixing seat 400, a self-locking card 500 and a debugging rod 600;

[0045] The fixing seat 400 is disposed on the cavity 100 or the cover plate 200 , and is provided with a debugging slot 410 and a card slot 420 communicating with the debugging slot 410 ;

[0046] The self-locking clamp 500 is disposed in the clamping slot 420 and is provided with circumferentially arranged deformation portions to enclose a self-locking space 700;

[0047] The debugging rod 600 is movably arranged in the debugging slot 410 and the self-locking space 700 to change the distance between its end and the resonator 300 .

[0048] In the present invention, the example in which the resonator 300 is installed on the cavity 100 and the fixing seat 400 is installed on the cover plate 200 is used for explanation. Specifically, when the cavity filter is assembled, the resonator 300 and the remaining accessories are first installed in the cavity 100, and then the fixing seat 400 is installed on the cover plate 200, and the self-locking card 500 is installed in the card slot 420 of the fixing seat 400. After the cover plate 200 is installed at the opening end of the cavity 100, the debugging rod 600 is inserted into the debugging slot 410 and the self-locking space 700 of the self-locking card 500, so that the debugging rod 600 extends into the cavity 100 and approaches the resonator 300. The position of the debugging rod 600 on the fixing seat 400 and the self-locking card 500 is repeatedly adjusted according to the changes in the vector network analyzer graph until the performance of the filter meets the design requirements.

[0049] Reference Figure 3-Figure 7As a first embodiment of the self-locking card 500, the self-locking card 500 includes a first annular seat 510a and a plurality of first elastic sheets 520a arranged in the first annular seat 510a along its circumferential direction and connected to the upper end of the first annular seat 510a. The first elastic sheet 520a constitutes a deformation portion. The first annular seat 510a is provided with a first broken groove 530a that penetrates axially and radially, so that the outer diameter of the first annular seat 510a can be changed. Specifically, the self-locking card 500 has a ring (circular) flanged undercut structure, the first annular seat 510a is hollow cylindrical, and the first elastic sheet 520a and the first elastic sheet 520a are made integrally by sheet metal technology. , and then bend inward to form a conical undercut. By distributing a number of grooves between two adjacent first elastic sheets 520a, the self-locking (clamping) force can be adjusted. It should be noted that the first annular seat 510a is provided with a first broken groove 530a that penetrates axially and radially. The purpose is to change the outer diameter of the self-locking card 500. When the self-locking card 500 is placed in the slot 420 of the fixed seat 400, its outer diameter can be compressed so that it can be smoothly placed in the slot 420; the outer wall of the self-locking card 500 needs to be parallel and close to the inner wall of the slot 420. The purpose is to make the debugging rod 600 smoother when inserted into the self-locking space 700 of the self-locking card 500.

[0050] The self-locking principle between the self-locking card 500 and the debugging rod 600 is as follows: Figure 4-Figure 5 The debugging rod 600 squeezes the first elastic sheet 520a of the self-locking card 500 to expand in all directions. At the same time, the first elastic sheet 520a applies a radial resistance, i.e., a self-locking force, to the debugging rod 600. The magnitude of the self-locking force can be adjusted by adjusting the compression amount of the first elastic sheet 520a and the thickness of the first elastic sheet 520a.

[0051] Reference Figure 6 In some embodiments, a plurality of first elastic sheets 520a enclose an inverted cone-shaped self-locking space 700, the angle between the first elastic sheet 520a and the central axis of the self-locking clip 500 is less than 45°, the lower ends of the plurality of first elastic sheets 520a do not contact each other, and the cone angle of the inverted cone-shaped self-locking space 700 is X, and X is less than 90°.

[0052] Reference Figure 6In some embodiments, an annular limiting platform 430 for limiting the self-locking card 500 in the card slot 420 is provided on the inner side wall of the card slot 420 away from the debugging through groove 410, and the debugging rod 600 is penetrated in the annular limiting platform 430, and the height of the annular limiting platform 430 is H2; in some embodiments, the inner diameter L2 of the annular limiting platform 430 is smaller than the outer diameter L of the self-locking card 500, so that the self-locking card 500 can pass through the annular limiting platform 430 and enter the card slot 420 in the state of the first outer diameter, and switch to the second outer diameter when it is completely accommodated in the card slot 420, and the second outer diameter is larger than the first outer diameter, and finally achieve The self-locking clamp 500 is confined in the clamping groove 420; in other embodiments, the difference between the inner diameter L2 of the annular limit platform 430 and the outer diameter L3 of the debugging rod 600 is 0-0.05mm, the purpose of which is to effectively prevent the metal chips generated by the debugging rod 600 during the debugging process from falling into the cavity 100, and the inverted cone-shaped self-locking space 700 structure formed by the self-locking clamp 500 can also prevent metal chips from falling into the cavity 100; in a further embodiment, the minimum inner diameter L1 of the inverted cone-shaped self-locking space 700 is smaller than the outer diameter L3 of the debugging rod 600, so as to achieve the radial and inward locking force on the debugging rod 600.

[0053] Reference Figure 8-Figure 14 As a second embodiment of the self-locking card 500, the self-locking card 500 includes a second annular seat 510b, the middle section of the second annular seat 510b is bent inward and is provided with a plurality of separation grooves 520b arranged at intervals along its circumference to define a plurality of second elastic sheets 530b, the second elastic sheets 530b constitute a deformation portion, and the second annular seat 510b is provided with a second broken groove 540b penetrating axially and radially so that the outer diameter of the second annular seat 510b can be changed; specifically, the self-locking card 500 is annular cylindrical and centrally symmetrical in the length direction, the second annular seat 510b is made of a sheet metal process, and the separation grooves 520b can be stamped out in one piece, thereby constructing a plurality of second elastic sheets 530b, through The bending method makes the second elastic sheet 530b bend toward the center of the self-locking card 500 to form an inward convex structure. The length direction of the second elastic sheet 530b is parallel to the length direction of the self-locking card 500 body. Several second elastic sheets 530b enclose a waist-drum-shaped (concave in the middle) self-locking space 700, and the minimum inner diameter L4 of the waist-drum-shaped self-locking space 700 is smaller than the outer diameter L3 of the debugging rod 600, and thus it has an interference fit with the debugging rod 600. The clamping force generated by the deformation of the second elastic sheet 530b applies a radial resistance, i.e., a self-locking force, to the debugging rod 600. The magnitude of the self-locking force can be adjusted by adjusting the compression amount of the second elastic sheet 530b, the thickness of the second elastic sheet 530b, etc.

[0054] Reference Figure 15-16As a third embodiment of the present invention, the cavity filter also includes a base 800 installed on the fixed seat 400 to form an annular limit platform 430. During assembly, the self-locking card 500 is first placed in the slot 420 on the fixed seat 400, and then the base 800 is installed on the fixed seat 400 to form the above-mentioned annular limit platform 430, which can limit the self-locking card 500 in the slot 420, and also provide an avoidance space for the movement of the debugging rod 600, and also solve the problem of difficult assembly of the self-locking card 500.

[0055] Reference Figure 15-16 The debugging rod 600 includes a screw segment 610 and a polished rod segment 620 connected to the screw segment 610. The polished rod segment 620 extends into the cavity 100. The extremely small gap (usually 0-0.05 mm) between the annular limit platform 430 (base 800) and the debugging rod 600 can prevent metal chips from falling into the cavity 100. Only the upper part of the debugging rod 600 is provided with a thread (screw segment 610). The purpose is to make the contact area between the lower part of the debugging rod 600 (polished rod segment 620) and the annular limit platform 430 (base 800) non-contact, which can prevent metal chips from falling into the cavity 100 along the thread. It should be noted that the debugging length of the debugging rod 600 (screw segment 610) is limited by the height of the card slot 420 in the fixing seat 400.

[0056] Reference Figure 8-Figure 12 In some embodiments, the debugging rod 600 is set as a screw rod or a smooth rod, preferably a smooth rod (without thread on the surface) and a clamping groove or a clamping block is set at the end; specifically, the chuck 900 has an opening and closing function, and can automatically clamp the debugging rod 600. During debugging, the chuck 900 clamps the debugging rod 600 and inserts it into the corresponding hole through the identification system. The clamping force generated by the elastic deformation of the self-locking clamp 500 can constrain its displacement. The filter is connected to the vector network analyzer, and the chuck 800 repeatedly moves axially for a small distance according to the vector network analyzer. The graph change feedback of the network analyzer determines the required position of the debugging rod 600, until the performance of the filter reaches the design requirements, the chuck 800 releases the debugging rod 600, and the debugging rod 600 is ensured not to be displaced by the clamping force generated by the deformation of the self-locking clamp 500. The clamping force generated by the deformation of the self-locking clamp 500 brings resistance to the axial movement of the debugging rod 600, which is sufficient to resist the displacement of the debugging rod 600 after the chuck 900 releases the debugging rod 600. And because the debugging rod 600 adopts a smooth rod, there is no sharp chamfer of the thread, and the movement of the smooth rod will not generate metal debris.

[0057] The advantages of the present invention are: a self-locking force is generated on the debugging rod by building a self-locking card into the fixing seat, and the metal chips generated when the debugging rod and the fixing seat move relative to each other can be well isolated to prevent them from falling into the cavity and affecting the intermodulation index or power ignition, thereby meeting the use requirements.

[0058] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art 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 with a self-locking tuning function, comprising a cavity (100), a cover plate (200) and a resonator (300), wherein the cover plate (200) is arranged at an open end of the cavity (100), and the resonator (300) is arranged in the cavity (100), characterized in that: It also includes a fixing seat (400), a self-locking clamp (500) and a debugging rod (600); The fixing seat (400) is arranged on the cavity (100) or the cover plate (200), and the fixing seat (400) is provided with a debugging through slot (410) and a card slot (420) communicating with the debugging through slot (410); The self-locking clamp (500) is arranged in the clamping slot (420) and is provided with circumferentially arranged deformation portions to enclose a self-locking space (700); The debugging rod (600) is movably arranged in the debugging slot (410) and the self-locking space (700) to change the distance between its end and the resonator (300).

2. The cavity filter with self-locking tuning function according to claim 1, characterized in that: An annular limiting platform (430) for limiting the self-locking clamp (500) in the slot (420) is provided on the inner side wall of the slot (420) away from the debugging through slot (410), and the debugging rod (600) is inserted into the annular limiting platform (430).

3. The cavity filter with self-locking tuning function according to claim 2, characterized in that: It also includes a base (800) mounted on the fixing seat (400) to form the annular limiting platform (430).

4. The cavity filter with self-locking tuning function according to claim 1, characterized in that: The self-locking clamp (500) comprises a first annular seat (510a) and a plurality of first elastic sheets (520a) arranged in a circumferential direction of the first annular seat (510a) and connected to the upper end of the first annular seat (510a), wherein the first elastic sheet (520a) constitutes the deformation portion, and the first annular seat (510a) is provided with a first broken groove (530a) penetrating axially and radially so that the outer diameter of the first annular seat (510a) can be changed.

5. The cavity filter with self-locking tuning function according to claim 4, characterized in that: A plurality of the first elastic sheets (520a) enclose the self-locking space (700) in the shape of an inverted cone, and the angle between the first elastic sheet (520a) and the central axis of the self-locking clamp (500) is less than 45°.

6. The cavity filter with self-locking tuning function according to claim 5, characterized in that: The minimum inner diameter L1 of the inverted cone-shaped self-locking space (700) is smaller than the outer diameter L3 of the debugging rod (600).

7. The cavity filter with self-locking tuning function according to claim 1, characterized in that: The self-locking clamp (500) comprises a second annular seat (510b), the middle section of which is bent inward and is provided with a plurality of separation grooves (520b) spaced apart along its circumference to define a plurality of second elastic sheets (530b), the second elastic sheets (530b) constituting the deformation portion, and the second annular seat (510b) is provided with a second broken groove (540b) penetrating axially and radially to make the outer diameter of the second annular seat (510b) variable.

8. The cavity filter with self-locking tuning function according to claim 7, characterized in that: A plurality of the second elastic sheets (530b) enclose the waist-drum-shaped self-locking space (700), and the minimum inner diameter L4 of the waist-drum-shaped self-locking space (700) is smaller than the outer diameter L3 of the debugging rod (600).

9. The cavity filter with self-locking tuning function according to claim 1, characterized in that: The debugging rod (600) is configured as a screw rod or a polished rod.

10. The cavity filter with self-locking tuning function according to claim 1, characterized in that: The debugging rod (600) comprises a screw rod segment (610) and a polished rod segment (620) connected to the screw rod segment (610), and the polished rod segment (620) extends into the cavity (100).

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