CN112448108A

CN112448108A - Filter, self-locking adjusting device for filter and manufacturing method of self-locking adjusting device

Info

Publication number: CN112448108A
Application number: CN201910820690.8A
Authority: CN
Inventors: 张书铭; 周晴; 林平
Original assignee: Nokia Shanghai Bell Co Ltd; Nokia Networks Oy
Current assignee: Nokia Shanghai Bell Co Ltd; Nokia Oyj
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2021-03-05
Anticipated expiration: 2039-08-29
Also published as: CN112448108B

Abstract

The present disclosure provides a self-locking adjustment device for a filter. The self-locking adjusting device comprises a self-locking adjusting plate, a locking adjusting plate and a locking adjusting mechanism, wherein the self-locking adjusting plate is suitable for being arranged on one side of a cover plate of the filter; an adjustment screw adapted to engage with the threaded hole of the cover plate to allow adjustment of the resonant frequency of the filter; and a self-locking hole formed on the self-locking adjusting plate and arranged to be at least partially aligned in an axial direction with a corresponding threaded hole on the cover plate for engagement by an adjusting screw of the filter, and wherein a diameter of an inscribed circle of the self-locking hole is smaller than a nominal diameter of the adjusting screw or smaller than a diameter of a non-threaded portion of the adjusting screw, so that at least a portion of the adjusting screw can interfere with a hole wall of the self-locking hole to provide self-locking for the adjusting screw. The self-locking adjusting device can use a standard adjusting screw to realize the adjustment of the preset torque, and the cost of the whole filter is greatly reduced. Furthermore, since the adjusting screw and/or the nut no longer need to be specially made, the threaded hole can be directly machined on the cover plate, which can promote miniaturization and light weight of the filter.

Description

Filter, self-locking adjusting device for filter and manufacturing method of self-locking adjusting device

Technical Field

Embodiments of the present disclosure relate to a filter and a self-locking adjusting device for the filter.

Background

In recent years, wireless communication systems have been advanced significantly in the rapid development of microwave and millimeter wave technologies. The cavity filter is a microwave filter adopting a resonant cavity structure.

The cavity filter mainly comprises a cavity, a cover plate covered on the cavity, an adjusting screw, a locking nut, a set screw and the like, wherein a resonant column is arranged in the cavity, and a screw through hole (such as a nut) for installing the set screw and the adjusting screw is arranged on the cover plate. The adjusting screw is widely used for adjusting the radio frequency performance of the filter and has the advantages of high tuning precision and easiness in control. The radio frequency equivalent capacitance and inductance in the filter cavity can be adjusted by the adjusting screw. The adjusted adjusting screw should be suspended in the nut without allowing any uncontrolled rotation. Therefore, how to lock the adjusting screw is the most important issue in the filter adjustment.

With the continuous development of modern communication technology, the requirements for miniaturization and high precision of the filter are higher and higher. In conventional solutions, in order to prevent uncontrolled rotation of the adjusting screw, it is common to use a specially designed self-locking adjusting screw. There is also a solution to achieve this by using a self-locking nut.

Disclosure of Invention

In a first aspect of the present disclosure, a self-locking adjustment device for a filter is provided. The self-locking adjusting device comprises a self-locking adjusting plate, a locking adjusting plate and a locking adjusting mechanism, wherein the self-locking adjusting plate is suitable for being arranged on one side of a cover plate of the filter; an adjustment screw adapted to engage with the threaded hole of the cover plate to allow adjustment of the resonant frequency of the filter; and a self-locking hole formed on the self-locking adjustment plate and arranged to be at least partially aligned with the threaded hole in an axial direction, and wherein a diameter of an inscribed circle of the self-locking hole is smaller than a nominal diameter of the adjustment screw or smaller than a diameter of an unthreaded portion of the adjustment screw, such that at least a portion of the adjustment screw is capable of interfering with a hole wall of the self-locking hole to provide self-locking for the adjustment screw.

In some embodiments, the diameter of the inscribed circle of the self-locking hole is smaller than the minor diameter of the thread of the adjusting screw.

In some embodiments, the diameter of the inscribed circle of the self-locking hole is larger than the minor diameter of the thread of the adjusting screw and the thickness of the hole wall is larger than or equal to the adjacent thread diameter (D) of the adjusting screw_h) The distance of (c).

In some embodiments, the self-locking adjustment apparatus further comprises a set of buffer holes formed on the self-locking adjustment plate and arranged to partially surround the self-locking hole.

In some embodiments, the buffer hole group includes a plurality of buffer holes evenly distributed around the corresponding self-locking hole.

In some embodiments, the threaded portion of the adjustment screw includes a chamfered portion disposed axially on at least a portion of the threaded portion of the adjustment screw to facilitate passage of at least one external thread of the adjustment screw through the self-locking bore into engagement with the internal thread of the threaded bore.

In some embodiments, the adjustment screw includes a chamfered portion disposed on the threaded portion to facilitate passage of at least one external thread of the adjustment screw through the self-locking bore into engagement with the internal thread of the threaded bore.

In some embodiments, the cross-sectional shape of the self-locking hole comprises any one selected from the group consisting of: circular, oval, polygonal, toothed or star-shaped.

In some embodiments, the self-locking adjustment plate is at least partially made of a metallic material.

In some embodiments, the self-locking hole and the buffer hole are punched.

In a second aspect of the present disclosure, a method of manufacturing a self-locking adjustment device for a filter is provided. The method includes providing a self-locking tuning plate adapted to be disposed on a side of a cover plate of the filter; and forming a plurality of self-locking holes on the self-locking adjusting plate, wherein each self-locking hole in the plurality of self-locking holes is arranged to be coaxial with a corresponding threaded hole on the cover plate for engagement of an adjusting screw of the filter, and the diameter of an inscribed circle of each self-locking hole in the plurality of self-locking holes is at least smaller than the nominal diameter of the adjusting screw, so that at least one part of the adjusting screw can interfere with the hole wall of the self-locking hole to provide self-locking for the adjusting screw.

In a third aspect of the disclosure, a filter is provided. The filter comprises a self-locking adjustment device as described above in relation to the first aspect.

It should be understood that this summary is not intended to identify key or essential features of the embodiments of the disclosure, nor is it intended to be used to limit the scope of the disclosure. Other features of the present disclosure will become readily apparent from the following description.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout the exemplary embodiments of the present disclosure.

Fig. 1 shows a perspective view of a filter according to an embodiment of the present disclosure;

fig. 2 shows a top view of a filter according to an embodiment of the present disclosure;

FIGS. 3 and 4 show perspective views of a self-locking adjustment device in use according to an embodiment of the present disclosure;

fig. 5 shows a schematic view of a self-locking hole and a buffer hole according to an embodiment of the disclosure;

FIGS. 6 and 7 show schematic views of a trim screw being trimmed in accordance with an embodiment of the present disclosure;

FIGS. 8 and 9 show schematic views of a trim screw being trimmed in accordance with an embodiment of the present disclosure;

fig. 10 to 13 are schematic views illustrating several cases where the self-locking hole and the adjusting screw interfere according to an embodiment of the present disclosure;

fig. 14-17 show schematic diagrams of several exemplary shapes of self-locking holes in accordance with embodiments of the present disclosure; and

fig. 18 shows a flow chart of a method of manufacturing a self-locking adjustment device according to an embodiment of the present disclosure.

The same or similar reference numbers will be used throughout the drawings to refer to the same or like elements.

Detailed Description

The present disclosure will now be described with reference to several example embodiments. It should be understood that these examples are described only for the purpose of enabling those skilled in the art to better understand and thereby enable the present disclosure, and are not intended to set forth any limitations on the scope of the technical solutions of the present disclosure.

As used herein, the term "include" and its variants are to be read as open-ended terms meaning "including, but not limited to. The term "based on" will be read as "based at least in part on". The terms "one embodiment" and "an embodiment" should be understood as "at least one embodiment". The term "another embodiment" should be understood as "at least one other embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions may be included below. The definitions of the terms are consistent throughout the specification unless the context clearly dictates otherwise.

The filter is a typical frequency selection device, which can effectively suppress the useless signals, so that the useless signals cannot pass through the filter, and only the useful signals smoothly pass through the filter, therefore, the quality of the performance of the filter directly affects the quality of the whole communication system, and the filter is a vital device in the modern microwave and millimeter wave communication system. Many different types of filters may be used in the frequency range in which the wireless communication system operates. And with the now more complex electromagnetic environment, microwave filters with higher performance requirements are required. In modern communication field, filters, especially cavity filters, have become an important ring in wireless communication.

One cavity can be equivalent to an inductor and a capacitor connected in parallel, so that a resonant level is formed, and the microwave filtering function is realized. Compared with microwave filters with other properties, the cavity filter has the advantages of firm structure, stable and reliable performance, smaller volume and moderate Q value. Therefore, the application of the cavity filter is very common in each large communication base station. The existing cavity filter generally comprises an input/output port, a cavity, a resonator, a cover plate, an adjusting screw and the like. The cavity filter can be finely adjusted by the adjusting screw, so that the purpose of changing the filtering frequency is achieved.

The adjusted adjusting screw should be suspended in the nut without allowing any uncontrolled rotation. Therefore, how to lock the adjusting screw is the most important issue in the filter adjustment. In order to achieve the desired adjustment performance, the torque requirements on the adjustment screw are high and the adjustment torque should generally be controlled between predetermined ranges. If the torque is too low, the adjusting screw is prone to loosening. If the torque is too large, it may be difficult to manually adjust the frequency. Furthermore, considering that the frequency of the filter needs to be constantly adjusted, the self-locking adjusting nut needs to be able to be repeated many times in order to meet the need, while being able to maintain the above-mentioned torque range.

Conventional adjusting screws are generally made of special parts, for example, self-locking adjusting screws generally adopt a two-section thread structure, and the screws can be manufactured by complicated machining processes. The difficulty of processing and manufacturing is high, and the precision is difficult to guarantee, so that the high cost of the self-locking adjusting screw is caused. Moreover, the self-locking adjusting screw is easy to deform or damage, so that the self-locking adjusting screw needs to be replaced frequently, and the maintenance cost of the whole filter is increased.

In addition, with the continuous development of modern communication technology, the requirements for miniaturization, light weight, and high accuracy of the filter are higher and higher. This trend also requires miniaturization and high precision of self-locking adjusting screws. However, if the diameter of the self-locking adjusting screw is too small, cracks or fractures are likely to occur due to the fact that the machining precision cannot be guaranteed and the structure of the self-locking adjusting screw is not guaranteed. Therefore, the conventional self-locking adjusting screw cannot meet the technical development requirement more and more.

In addition, since the adjusting screw adopts a double-section thread, a relatively long part of the adjusting screw must be exposed out of the cover plate of the filter, which hinders the development trend of miniaturization of the filter. In addition, such conventional adjusting screws tend to drop metal shavings into the resonator during adjustment, thereby affecting the performance of the filter. Moreover, self-locking nuts also suffer from the problem that the entire cover plate needs to be replaced when individual nuts are damaged, which further increases maintenance costs.

Embodiments of the present disclosure provide a self-locking adjustment device 100 for a filter 200 to address, or at least partially address, the above-described and/or other potential problems of conventional self-locking adjustment screws or nuts. Some example embodiments will now be described with reference to fig. 1 to 5.

Fig. 1 shows a perspective view of a filter 200; FIG. 2 shows a top view of filter 200; and figures 3 and 4 show perspective views of self-locking adjustment device 100 in a use state. As shown, the self-locking adjusting apparatus 100 according to the embodiment of the present disclosure includes a self-locking adjusting plate 101, an adjusting screw 104, and a self-locking hole 102 formed on the self-locking adjusting plate 101. The self-locking adjusting plate 101 is disposed at one side of the cover plate 201 of the filter 200.

Although self-locking regulation plate 101 is shown to include a plurality of self-locking holes 102, it should be understood that each self-locking regulation plate 101 may include only one self-locking hole 102. That is, each self-locking adjusting plate 101 may correspond to one screw hole 2011 on the cover plate 201, and the cover plate 201 may be arranged with a plurality of self-locking adjusting plates 101 to adjust the torque of the adjusting screw 104. The main concept of the present disclosure will be explained below by taking as an example that the self-locking regulation plate 101 shown in the drawings includes a plurality of self-locking holes 102. It should be understood that the same is applicable to the solution that self-locking adjusting plate 101 includes a self-locking hole 102, and will not be described in detail below.

The self-locking apertures 102 are arranged to be at least partially axially aligned with corresponding threaded apertures 2011 on the cover plate 201. The threaded holes 2011 are used for engagement by the filter adjustment screws 104. The adjustment screw 104 may be referred to herein as a standard screw. Of course, in some embodiments, to facilitate insertion of the adjustment screw 104 into the self-locking aperture 102 to engage the threaded aperture 2011, a standard screw may be trimmed or chamfered, as will be further described below.

By at least partially aligned, it is meant that the axes of the self-locking aperture 102 and the threaded aperture 2011 may be coaxial or that the axes of the two may be offset by a distance that does not affect the simultaneous passage of the adjustment screw 104 through the self-locking aperture 102 and the threaded aperture 2011. In the conventional solution described above, at least one of the adjustment screw 104 and the nut or the cover plate forming the threaded hole needs to be specially made, thereby causing processing difficulty and cost increase.

According to an embodiment of the present disclosure, the diameter D of the inscribed circle of the self-locking hole 102_hAt least smaller than the nominal diameter D of the adjusting screw 104, i.e. the diameter D of the inscribed circle_hAt least smaller than the major diameter of the set screw 104. Here, the inscribed circle here means a circle on which the innermost point (i.e., the point closest to the center) in the sectional shape of the self-locking hole 102 perpendicular to its body axis is located or a circle that is tangent to the innermost side.

For example, in the case where the shape of the self-locking hole 102 is an ellipse, the inscribed circle is a circle passing through the vertex of the short side (which may be said to be a circle tangent to the ellipse). In the case where the cross-sectional shape of the self-locking hole 102 is a star shape (e.g., a pentagram shape, as shown in fig. 16), the inscribed circle is a circle that meets all of the innermost points of the pentagram shape, i.e., a circle on which all of the innermost points lie. In the case where the cross-sectional shape of the self-locking hole 102 is a polygon, as shown in fig. 14, the inscribed circle is a circle that is tangent to the innermost side of the polygon.

Of course, the diameter D of the inscribed circle of the self-locking hole 102_hAnd may also be smaller than the diameter of the unthreaded portion of set screw 104. By so doing, at least a portion of the adjustment screw 104 (including any of the threaded portion and the unthreaded portion) can interfere with the hole wall of the self-locking hole 102. This interference is accompanied by a deformation of at least one part of the adjusting screw 104 or the hole wall, so that a greater force acts on the adjusting screw 104, so that the torque acting on the adjusting screw 104 increases when the adjusting screw 104 is operated.

As is known, the larger the area of interference, the greater the torque and vice versa. Based on this principle, the embodiment described herein uses a simple self-locking adjusting plate 101 and a self-locking hole 102 structure formed thereon to achieve a predetermined torque when operating the adjusting screw 104 by adjusting the size of the interference area. Furthermore, uncontrolled rotation of the adjusting screw 104 after adjustment into position can thereby be effectively prevented.

That is, by providing the self-locking adjusting plate 101 and the self-locking hole 102 formed thereon, the adjusting screw 104 and the nut forming the threaded hole can be implemented with the existing standard components to achieve the predetermined torque in operation and self-locking of the adjusting screw 104. This eliminates the need for the use of self-locking adjusting screws and/or nuts, which are particularly difficult to machine and costly, thereby reducing the cost of the overall filter 200. Furthermore, since the adjusting screw and/or the nut no longer need to be specially made, the threaded hole can be directly machined on the cover plate, which can promote miniaturization and light weight of the filter. In addition, since the adjusting screw is made of a standard component, the manufacturing and processing technology is mature, and sufficient strength can be ensured even if the diameter is small, thereby further allowing the filter to be miniaturized while improving the performance of the filter 200.

It was mentioned above that the adjustment screw 104 may be trimmed or chamfered in order to facilitate the adjustment screw 104 passing through the self-locking hole 102 to engage the threaded hole 201. For example, in some embodiments, as shown in fig. 6 and 7, the adjustment screw 104 may include a cut-out portion 1041. The cutting edge portion is formed by cutting off a part of the thread in the axial direction from the root portion of the thread. In some embodiments, the threads may be cut symmetrically along and with respect to the axis. The thickness T between the cut edge portions on both sides of the axis is preferably smaller than the diameter D of the inscribed circle of the self-locking hole 102_hTo facilitate at least one thread of the adjustment screw 104 being able to pass through the self-locking aperture 102 to engage the threaded aperture 2011 when inserted.

This situation is generally applicable to the case where self-locking adjustment plate 101 is located on the outer side of cover plate 201. That is, after the adjustment screw 104 is inserted into the threaded hole 2011 through the self-locking hole 102, at least one external thread of the adjustment screw 104 can be engaged with an internal thread of the adjustment hole 2011. As the set screw 104 is threaded after insertion, the external threads of the set screw 104 can then engage more of the internal threads, allowing at least a portion of the set screw 104 to interfere with the bore wall of the self-locking bore 102 to produce a predetermined torque. In some embodiments, the adjustment screw 104 may also be cut asymmetrically with respect to the axis of the screw. The cutting of the adjusting screw may be achieved by any suitable machining means such as milling, grinding or laser cutting.

In some embodiments, the threaded portion of the adjustment screw 104 may also be chamfered, i.e., the adjustment screw 104 may include a chamfered portion 1042, as shown in fig. 8 and 9. The chamfered angle β is such that the root of the threaded portion of the adjustment screw 104 tapers in the direction of insertion, which facilitates the ability of at least one thread of the adjustment screw 104 to pass through the self-locking aperture 102 to engage the threaded aperture 2011 upon insertion. The chamfer may be achieved by molding the adjustment screw 104 using a mold so that the adjustment screw 104 can be more conveniently machined. In alternative embodiments, the chamfer may be achieved by any suitable machining.

In some embodiments, self-locking adjustment plate 101 may be made of metal. The self-locking adjusting plate 101 made of metal can be in close contact with the adjusting screw 104 interfered with the self-locking adjusting plate, so that the radio frequency performance better than that of the traditional filter 104 can be achieved under the condition that the cover plate 201 is not required to be plated with copper. In some embodiments, self-locking adjustment plate 101 may be made of beryllium copper, phosphor bronze, or the like, which is more conductive. In alternative embodiments, self-locking adjustment plate 101 may be made of stainless steel. This may further reduce costs.

Of course, it should be understood that the embodiment in which self-locking adjustment plate 101 may be made of metal is merely illustrative and not intended to limit the scope of the present disclosure. Any other suitable manner or structure is possible. For example, in some alternative embodiments, self-locking regulation plate 101 may be only partially made of a metallic material. For example, in these embodiments, only the self-locking hole 102 of the self-locking adjusting plate 101 is made of metal, and the other parts are made of non-metal materials. This enables further cost and weight reduction. Furthermore, in some alternative embodiments, self-locking adjustment plate 101 may also be made entirely of a non-metallic material.

As shown in fig. 3 and 4, the self-locking adjusting plate 101 may be disposed on an outer side of the cover plate 201 (i.e., a side of the cover plate 201 away from the filter cavity) or an inner side of the cover plate 201 (i.e., a side of the cover plate close to the filter cavity). This arrangement increases the degree of freedom with which the self-locking adjustment device is provided, thereby enabling the self-locking adjustment device to be implemented more easily.

For example, in some embodiments, self-locking regulation plate 101 may be disposed outside of cover plate 201, as shown in fig. 3. This arrangement effectively prevents impurities such as metal debris from falling into the cavity and affecting the accuracy and performance of the filter.

In some embodiments, as shown in fig. 4, a self-locking adjustment plate may also be disposed inside the cover plate 201. In this case, as already mentioned above, since the hole wall of the self-locking hole 102 can be brought into close contact with the adjustment screw 104 by interference, it is good for the radio frequency performance of the filter. This arrangement eliminates the need for additional copper plating of the cover plate 201 to improve the rf performance of the filter, thereby further reducing cost while improving filter performance.

Whether the self-locking adjusting plate 101 is disposed on the inner side or the outer side of the cover plate 201 can be freely selected according to the use environment and actual needs of the filter 200 when designing the filter 200. Further, self-locking adjusting plate 101 may be disposed on one side of cover plate 201 in any suitable manner. For example, by fastener attachment, solder paste soldering, laser welding, or Surface Mount Technology (SMT), etc., as will be further described below.

Fig. 5 schematically shows a dimensional relationship view of a single self-locking aperture 102 and a threaded aperture 2011 coaxial therewith. It can be seen that by making the diameter D of the inscribed circle of the self-locking hole 102_hSmaller than the nominal diameter d of the adjustment screw 104, the adjustment screw 104 can interfere with the wall of the self-locking hole 102. By adjusting the stemsThe size of the interference zone can be adjusted to adjust the amount of torque applied to the set screw 104, and the size of the interference zone is adjusted except for the diameter D of the inscribed circle_hIn addition, an important parameter, namely the thickness H of the self-locking adjusting plate 101, needs to be introduced.

The interference between the adjustment screw 104 and the wall of the self-locking hole 102 will be shown by way of example. Several examples of which are shown in fig. 10-13. For example, fig. 10 shows a case where the hole wall of the self-locking hole 102 interferes with the tooth profile of the thread of the adjustment screw 104. It can be seen from the figure that except for the diameter D of the inscribed circle_hSmaller than the nominal diameter d of the adjusting screw 104 but larger than the minor diameter d of the adjusting screw 104₃In addition, the thickness H of the self-locking adjusting plate 101 needs to be larger than or equal to the diameter D of any two adjacent threads of the adjusting screw 104_hA distance D of_p. Wherein the distance D here_pRefers to the distance between the portions of two adjacent threads that are close to each other, as shown in fig. 10. This condition enables the toothed portion of the adjustment screw 104 to interfere with the end of the hole wall of the self-locking hole 102.

Fig. 11 shows another case of interference. In such an embodiment as shown in fig. 11, except for the diameter D of the inscribed circle_hSmaller than the nominal diameter d of the set screw 104 and smaller than the minor diameter d of the set screw 104₃In addition, the thickness H of the self-locking adjusting plate 101 is smaller than the thread pitch P of the threads of the adjusting screw 104. It can be seen that this case employs a relatively thin self-locking adjustment plate 101 so that the small diameter portion of the adjustment screw 104 can interfere with the wall of the self-locking hole 102. Of course, it should be understood that the diameter D of the inscribed circle_hSmaller than the nominal diameter d of the set screw 104 and smaller than the minor diameter d of the set screw 104₃In this case, the thickness H of the self-locking adjusting plate 101 may be greater than or equal to the pitch P of the adjusting screw 104.

Fig. 12 shows another case of interference. In such an embodiment as shown in fig. 12, except for the diameter D of the inscribed circle_hSmaller than the nominal diameter d of the adjusting screw 104 but larger than the minor diameter d of the adjusting screw 104₃In addition, the thickness H of the self-locking adjusting plate 101 can be larger than or equal to that of the adjusting screw104, the pitch P of the thread. It can be seen that this case employs the self-locking adjusting plate 101 which is relatively thick so that the outermost side (i.e., the large diameter portion) of the toothed portion of the adjusting screw 104 can interfere with the hole wall of the self-locking hole 102.

In addition, as can be seen from fig. 10 and 12, the diameter D of the inscribed circle_hSmaller than the nominal diameter d of the adjusting screw 104 but larger than the minor diameter d of the adjusting screw 104₃In this case, the thickness H of the self-locking adjusting plate 101 may be greater than or smaller than the pitch P of the thread. This allows the desired thickness to be freely selected according to the needs of the actual situation.

The three cases shown above are all where the self-locking hole 102 interferes with the threaded portion of the adjustment screw 104. Fig. 13 shows a more specific case of interference. Fig. 13 shows that the self-locking hole 102 may also interfere with the unthreaded portion of the adjustment screw 104. This arrangement allows the adjusting screw 104 to be inserted relatively deeply into the cavity, so that the portion of the adjusting screw 104 exposed out of the cover 201 is smaller, thereby enabling the filter 200 to be further miniaturized.

Fig. 10-13 illustrate various embodiments of interference of the set screw 104 with the self-locking hole 102. As can be seen from these embodiments, the diameter D of the inscribed circle of the self-locking hole 102_hAnd the thickness H of the self-locking adjusting plate 101 are two important parameters for adjusting the size of the area where the screw 104 and the self-locking hole 102 interfere (i.e., the torque magnitude). The diameter D of the inscribed circle, determined by the selected adjusting screw 104_hAnd the thickness H of self-locking adjustment plate 101 together determine the amount of torque applied to adjustment screw 104.

Of course, it should be understood that other than the diameter D of the inscribed circle_hAnd the thickness H of self-locking adjusting plate 101, such as the nominal diameter d and the minor diameter d of adjusting screw 104₃Parameters such as the pitch P of the thread and the thread profile angle are also important parameters that influence the magnitude of the torque. Since the self-locking adjustment device 100 according to the present disclosure can select a standard adjustment screw 104, the above parameters of the adjustment screw 104 are relatively certain. Therefore, in designing and manufacturing the self-locking adjusting device 100, the selection is madeAfter the appropriate adjustment of the screw 104, it is only necessary to adjust the diameter D of the inscribed circle_hAnd the thickness H of self-locking adjusting plate 101 to adjust the amount of torque applied to adjusting screw 104. This simplifies the design and manufacturing process, thereby reducing costs.

For example, the adjustment screw 104 is selected to be an M2.5X 0.45-0.6g screw. Where M2.5 means that the nominal diameter of the adjustment screw 104 is 2.5mm, 0.45 means the pitch of the thread of the adjustment screw 104, and 6g means the machining accuracy. At this time, the minor diameter d of the screw 104 is adjusted₃About 1.95 mm. At this time, if the thickness H of the self-locking adjusting plate 101 is 0.2mm, considering the plate thickness and the machining error of the self-locking hole 102, D is between the inscribed circles of the self-locking hole 102_hTypically designed to be 1.8mm 0.05.

The cross-sectional shape of the self-locking hole 102 perpendicular to its own axis may be any particular shape. Fig. 5, 14-17 illustrate several exemplary cross-sectional shapes of the self-locking aperture 102. As shown in FIG. 5, in some embodiments, the cross-sectional shape of the self-locking hole 102 may be an ellipse, and the length of the short side of the ellipse is equal to the diameter D of the inscribed circle of the self-locking hole 102_h. In addition, in the case where the self-locking hole 102 adopts an elliptical hole, in order that the self-locking hole 102 does not occupy too large an area, straight segments 1021 or large arc segments may be formed at both ends of the long side of the elliptical hole, as shown in fig. 17, which may effectively reduce the length of the long side of the elliptical hole, thereby reducing the area occupied by the self-locking hole 102.

The sectional shape of the self-locking hole 102 may be the shape of the hole shown in fig. 14 and the shape of the tooth shape shown in fig. 16, in addition to the elliptical hole. Of course, it should be understood that the examples of such shapes of the self-locking hole 102 shown in the figures are merely illustrative and are not intended to limit the scope of the present disclosure. Any other suitable shape is possible. For example, in some embodiments, the self-locking aperture 102 may also take the form of a circular hole. In some alternative embodiments, the self-locking hole 102 may also be in the form of a star-shaped hole, a polygonal hole, or a special-shaped hole.

Self-locking hole 102 may be formed in self-locking regulation plate 101 in any suitable manner. For example, in some embodiments, self-locking hole 102 may be formed in self-locking regulation plate 101 in a stamped manner. The stamping can make the self-locking hole 102 formed on the self-locking adjusting plate 101 in a simple and accurate manner, so that the forming method can further reduce the manufacturing cost of the filter. In some alternative embodiments, the self-locking hole 102 may be formed on the self-locking adjusting plate 101 by machining such as drilling.

It will be appreciated from the above description that, regardless of the shape of the self-locking hole 102, the diameter of the inscribed circle (i.e., the smallest circle) of the self-locking hole 102 needs to be smaller than the nominal diameter or the diameter of the unthreaded end of the set screw 104. In addition, the diameter D of the circumscribed circle (i.e., the maximum diameter) of the self-locking hole 102_cIs also an important parameter. In the case where the self-locking hole 102 has an elliptical shape as shown in fig. 5, the diameter D of the circumscribed circle of the self-locking hole 102 is set to be larger than the diameter D of the circumscribed circle of the self-locking hole 102_cI.e. the length of the long side of the ellipse.

Diameter D of the circumscribed circle of the self-locking hole 102_cThe larger the adjustment screw 104, the easier it is to pass through the self-locking hole 102. This is because the diameter D of the circumscribed circle of the self-locking hole 102_cThe larger the hole wall of the self-locking hole 102, the more elastic it is. It can be seen that by choosing the diameter D of the circumscribed circle of appropriate size_cThis may allow the set screw 104 to enter the self-locking hole more easily and allow for greater torque during assembly.

In addition to self-locking hole 102, in some embodiments, self-locking adjustment device 100 further includes a set of buffer holes 103 formed on self-locking adjustment plate 101, as shown in fig. 1, 2, 5, 14, and 17. As can be seen, the set of buffer holes 103 partially surround the corresponding self-locking hole 102. Like the self-locking hole 102, the buffer hole group 103 may be formed by punching or any other machining method.

The presence of the set of buffer holes 103 reduces the amount of clamping force acting on the set screw 104, and thus reduces the amount of torque acting on the set screw 104. For example, for some shapes of the self-locking hole 102 and the set of buffer holes 103, the presence of the set of buffer holes 103 is simulated to reduce the clamping force acting on the set screw 104 from 180N to about 90N as compared to the case without the set of buffer holes 103.

In some embodiments, each buffer hole group 103 may include a plurality of buffer holes 1031, which may be evenly distributed around the corresponding self-locking hole 102, as shown in fig. 5 and 14. The uniform distribution here may mean that the angle α at which the buffer holes 1031 are opened with respect to the center of the self-locking hole 102 is the same, on the one hand. On the other hand, the uniform distribution may also be such that the radial thickness G between the self-locking hole 102 and the punched hole 1031, which refers to the self-locking adjusting plate 101 at the same time, is uniform, as shown in fig. 5.

Of course, it should be understood that the embodiment in which the buffer holes 1031 may be evenly distributed around the corresponding self-locking hole 102 is merely illustrative and is not intended to limit the scope of the present disclosure. Any other suitable arrangement or configuration is possible. For example, in some alternative embodiments, the buffer holes 1031 may also be unevenly distributed around the corresponding self-locking hole 102 in order to meet different requirements.

The unevenness here may mean that an angle α at which each of the buffer holes 1031 opens is different and/or a radial thickness G between each of the self-locking holes 102 and the buffer holes 1031 is uneven. In the case where the radial thickness G between each of the self-locking hole 102 and the punched hole 1031 is not uniform, it is generally the smallest radial thickness G between the self-locking hole 102 and the punched hole 1031 as a torque acting on the set screw 104.

Further, the presence of the buffer hole group 103 can reduce excessive deformation from the edge of the locking hole 102, as compared with the case without the buffer hole group 103. The reduction in excessive deformation can increase the number of repetitions of operating the adjustment screw 104 and reduce the occurrence of metal shavings being stripped from the adjustment screw 104 or the hole wall, thereby enabling further improvement in the performance of the self-locking adjustment device 100.

Including the thickness H of self-locking adjusting plate 101 and the diameter D of the inscribed circle of self-locking hole 102 mentioned above_hThe angle α at which the relief hole opens and the radial thickness G are also important parameters for adjusting the amount of torque applied to the adjustment screw 104. In general, other parameters are notIn other words, the greater the radial thickness G, the greater the torque required to operate the adjustment screw 104, and the greater the angle α at which the damping hole 1031 opens, the less the torque required to operate the adjustment screw 104.

That is, in the case where the adjustment screw 104 has been determined, the thickness H of the self-locking adjustment plate 101, the diameter D of the inscribed circle of the self-locking hole 102 can be adjusted_hThe amount of torque applied to the adjustment screw 104 is adjusted by one or more of the angle a at which the relief hole opens and the radial thickness G. How to select appropriate values of the above parameters to achieve the predetermined torque will be described below by way of example.

In the filter 104, a phosphor bronze C5191 plate having a thickness H of 0.3mm was first selected as the self-locking adjustment plate 101. The shape of the self-locking hole 102 is an ellipse, and the diameter D of the inscribed circle of the self-locking hole 102_h(the length of the short side of the ellipse) is selected to be 1.93mm, the diameter D of the circumscribed circle_c(length of long side of ellipse) is 5 mm. In order to save space, a 0.2mm straight line segment was formed at both ends of the long side as shown in fig. 17.

Two stages of buffer holes 1031 are formed in the self-locking adjusting plate 101 around each self-locking hole 102, and each stage of buffer holes 1031 is opened at an angle α of 80 °, and the radial width of the buffer hole 1031 is 0.5 mm. Between the self-locking hole 102 and its corresponding buffer hole 1031, there is a self-locking adjustment plate 101 having a radial thickness G of 1 mm.

The self-locking adjusting device 100 thus manufactured is welded above the cover plate 201, as shown in fig. 3. For example, when soldering, solder paste or the like may be first coated on the cover plate 201 by a stencil printing technique, and then the self-locking adjusting device 100 may be soldered to the cover plate 201 by a reflow soldering process. Welding in this manner simplifies the machining and assembly process, thereby reducing cost and improving efficiency. Of course, it should be understood that this manner of welding the self-locking adjustment device 100 to the cover plate 201 is merely illustrative and is not intended to limit the scope of the present disclosure. Any other suitable manner is also possible. For example, in some alternative embodiments, self-locking adjustment plate 101 may also be attached to cover plate 201 by laser welding, fastener connection, or SMT, among others.

An adjusting screw 104 of M2.5 multiplied by 0.45-6g is used for being assembled in the self-locking hole 101 of the self-locking adjusting device 100 assembled as described above. Through simulation tests, the torque required to screw in the set screw 104 is between 0.025Nm and 0.05Nm, and the torque required to unscrew the set screw 104 is between 0.02Nm and 0.045Nm, and the torques can be maintained several times and are fully satisfactory. Furthermore, upon testing the rf tuning performance, better performance was achieved with the filter 200 using the self-locking tuning device 100 according to the present disclosure, even without copper plating of the cover plate 201, compared to conventional filters, due to the good contact of the self-locking tuning plate 101 and the tuning screws 104.

From the above description, it can be seen that by using the self-locking adjustment device 100 according to the present disclosure. Since stable torque adjustment can be achieved using the existing standard adjustment screw, the cost can be effectively reduced. The self-locking adjusting plate 101 is usually made of a metal plate, and the self-locking hole 102 and the adjusting hole group 103 can be formed by stamping, so that the processing difficulty is further reduced, the processing efficiency is improved, and the cost is reduced. In addition, better strength and performance can be achieved with standard, e.g., M2.5, set screws as compared to conventional, specially made set screws.

And in the case where the self-locking adjusting plate 101 is disposed outside the cover plate 104, even if the adjusting screw 104 drops metal chips while interfering with the hole wall of the self-locking hole 102 of the self-locking adjusting plate 101, the metal chips do not fall into the resonance cavity. This ensures the performance of the filter.

Furthermore, due to the good contact of the self-locking adjusting plate 101 and the adjusting screw 104, even in case the cover plate 201 is not plated with copper, a better performance is achieved with the filter 200 of the self-locking adjusting device 100 according to the present disclosure. Also, the threaded bore 2011 may be formed directly on the cover plate 104 as a two-piece threaded adjustment screw or nut is no longer required. This facilitates miniaturization and weight reduction of the filter.

Another aspect of the present disclosure also provides a method of manufacturing the self-locking adjustment device 100. Fig. 18 shows a flow chart of a method 1400 of manufacturing the self-locking adjustment device 100 according to an embodiment of the present disclosure. As shown in fig. 18, at 1410, a self-locking regulation plate 101 is provided, and the self-locking regulation plate 101 can be disposed outside or inside the cover plate 201 of the filter 200.

At 1420, a plurality of self-locking holes 102 are formed, for example by punching, on self-locking adjusting plate 101, each self-locking hole 102 being arranged coaxially with a corresponding threaded hole 2011 on cover plate 201 for engagement by adjusting screw 104 of filter 200. Wherein the diameter D of the inscribed circle of the self-locking hole 102_hAt least less than the nominal diameter d of the adjustment screw 104, such that at least a portion of the adjustment screw 104 is able to interfere with the bore wall of the self-locking bore 102 to provide self-locking for the adjustment screw 104.

The self-locking adjusting device 100 manufactured by the manufacturing method can realize stable torque adjustment by using standard adjusting screws, and meanwhile, the cost can be effectively reduced.

According to another aspect of the present disclosure, there is also provided a filter 200, the filter 200 comprising the self-locking adjusting device 100 as described above. By using the self-locking adjustment device of the present disclosure, the performance of the filter 200 is effectively improved.

It is to be understood that the above detailed embodiments of the disclosure are merely illustrative of or explaining the principles of the disclosure and are not limiting of the disclosure. Therefore, any modification, equivalent replacement, and improvement made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure. Also, it is intended that the appended claims cover all such changes and modifications that fall within the true scope and range of equivalents of the claims.

Claims

1. A self-locking adjustment device (100) for a filter (200), comprising:

a self-locking adjustment plate (101) adapted to be arranged on one side of a cover plate (201) of the filter (200);

-an adjustment screw (104) adapted to engage with a threaded hole (2011) of the cover plate (201) to allow adjustment of the resonance frequency of the filter (200); and

a self-locking hole (102) formed on the self-locking regulation plate (101), and the self-locking hole (102) is arranged to be at least partially aligned with the threaded hole (2011) in an axial direction, and

wherein the diameter (D) of the inscribed circle of the self-locking hole (102)_h) Is smaller than the nominal diameter (d) of the adjustment screw (104) or is smaller than the diameter of the unthreaded portion of the adjustment screw (104) such that at least a portion of the adjustment screw (104) is capable of interfering with the bore wall of the self-locking bore (102) to provide self-locking for the adjustment screw (104).

2. The self-locking adjustment device (100) according to claim 1, wherein the diameter (D) of the inscribed circle of the self-locking hole (102)_h) A minor diameter (d) smaller than the thread of the adjusting screw (104)₃)。

3. The self-locking adjustment device (100) according to claim 1, wherein the diameter (D) of the inscribed circle of the self-locking hole (102)_h) A minor diameter (d) greater than the thread of the adjusting screw (104)₃) And the thickness (H) of the hole wall is greater than or equal to the diameter (D) of the adjacent thread of the adjusting screw (104)_h) Distance (D) of_p)。

4. The self-locking adjustment device (100) of claim 1, further comprising:

a buffer hole group (103) formed on the self-locking adjusting plate (101) and arranged to partially surround the self-locking hole (102).

5. The self-locking adjustment device (100) according to claim 4, wherein the set of buffer holes (103) comprises a plurality of buffer holes (1031) evenly distributed around the self-locking hole (102).

6. The self-locking adjustment device (100) of claim 1, wherein the adjustment screw (104) comprises a chamfered portion (1041) arranged axially on at least a portion of a threaded portion of the adjustment screw (104) to facilitate at least one external thread of the adjustment screw (104) passing through the self-locking aperture (102) to engage with an internal thread of the threaded aperture (2011).

7. The self-locking adjustment device (100) of claim 1, wherein the adjustment screw (104) comprises a chamfered portion (1042) arranged at a threaded portion of the adjustment screw (104) to facilitate at least one external thread in the adjustment screw (104) to pass through the self-locking hole (102) to engage with an internal thread of the threaded hole (2011).

8. The self-locking adjustment device (100) of claim 1, wherein the cross-sectional shape of the self-locking hole (102) comprises any one selected from the group consisting of: circular, oval, polygonal, toothed or star-shaped.

9. The self-locking adjustment device (100) of claim 1, wherein the self-locking adjustment plate (101) is at least partially made of a metallic material.

10. The self-locking adjustment device (100) according to claim 5, wherein the self-locking hole (102) and the plurality of relief holes (1031) are stamped.

11. A method of manufacturing a self-locking adjustment device (100) for a filter (200), comprising:

providing a self-locking regulation plate (101), the self-locking regulation plate (101) being adapted to be arranged on one side of a cover plate (201) of the filter (200);

-providing an adjustment screw (104) adapted to engage with a threaded hole (2011) of the cover plate (201) to allow adjustment of the resonance frequency of the filter (200); and

forming a self-locking hole (102) on the self-locking regulation plate (101), wherein the self-locking hole (102) is arranged to be at least partially aligned with the threaded hole (2011) in an axial direction, and

wherein the diameter (D) of the inscribed circle of the self-locking hole (102)_h) Is at least less thanA nominal diameter (d) of the adjustment screw (104) or less than a diameter of an unthreaded portion of the adjustment screw (104) such that at least a portion of the adjustment screw (104) is capable of interfering with a bore wall of the self-locking bore (102) to provide self-locking for the adjustment screw (104).

12. A filter (200) comprising a self-locking adjustment device (100) according to any one of claims 1 to 10.