Cover plate assembly and filter

Abstract

The utility model relates to the technical field of communication, and provides a cover plate assembly and a filter, the cover plate assembly comprises a cover plate, a screw rod and a limiting protrusion, one side of the cover plate in the thickness direction is provided with a groove, the limiting protrusion is arranged on the bottom wall of the groove, and the end part of the screw rod is provided with an anti-rotation structure. The anti-rotation structure is located on the inner side of the limiting protrusion and matched with the inner wall face of the limiting protrusion in an anti-rotation mode. The end, away from the bottom wall of the groove, of the limiting protrusion is provided with a crimping edge, and the crimping edge is crimped to the side, back to the bottom wall of the groove, of the anti-rotation structure. The anti-rotation structure on the screw rod in the cover plate assembly can achieve the anti-rotation function and the anti-falling function, machining of the screw rod is simplified, and the machining cost of the screw rod is reduced.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a cover plate assembly and a filter. Background Art

[0002] The filter usually includes a cavity, a resonant rod, a cover plate and a tuning screw. The resonant rod is fixed in the cavity, and the cover plate covers the cavity. The cover plate is provided with a threaded hole, and the tuning screw is screwed into the threaded hole. The distance between the tuning screw and the resonant rod is changed by rotating the tuning screw, thereby adjusting the resonant frequency. In the process of matching the tuning screw with the threaded hole, metal chips may be generated. The metal chips entering the cavity will affect the normal use of the filter.

[0003] In order to solve the above technical problems, the technical solution adopted is: a groove is set on the cover plate, and a support plate is set at the notch of the groove, the screw passes through the support plate and is fixed on the bottom wall of the groove, and a nut is also threadedly connected to the screw, and the nut is located on the side of the support plate facing away from the bottom wall of the groove; by rotating the nut, the screw is used to drive the bottom wall of the groove to deform, thereby adjusting the distance between the bottom wall of the groove and the resonance rod, thereby realizing the adjustment of the resonant frequency; at the same time, the generated metal chips will only enter the groove but not the cavity, so as to avoid affecting the normal use of the filter.

[0004] At present, the screw is usually fixed to the bottom wall of the groove by means of interference fit. Specifically, a fixing hole is provided on the bottom wall of the groove, and an anti-rotation structure and an anti-slipping structure are provided on the screw in sequence along its axial direction. The anti-slipping structure prevents the screw from slipping out of the fixing hole, and the anti-rotation structure prevents the screw from rotating in the fixing hole. In addition, knurling is provided on the periphery of the anti-rotation structure to ensure the strength of the crimping. Since the anti-rotation structure and the anti-slipping structure are arranged separately in the axial direction of the screw, and knurling is required on the periphery of the anti-rotation structure, the processing of the screw is relatively complicated and the cost is relatively high. Utility Model Content

[0005] In view of this, the embodiments of the present application provide a cover plate assembly and a filter to solve the problem of complex screw processing and high cost.

[0006] An embodiment of the first aspect of the present application proposes a cover plate assembly, comprising a cover plate, a screw rod and at least one limiting protrusion, wherein the cover plate is provided with a groove on one side in the thickness direction thereof, the limiting protrusion is provided on the bottom wall of the groove, an anti-rotation structure is provided on the screw rod, the anti-rotation structure is located on the inner side of the limiting protrusion and cooperates with the inner wall surface of the limiting protrusion for anti-rotation; a crimping edge is provided at one end of the limiting protrusion away from the bottom wall of the groove, and the crimping edge is crimped on the side of the anti-rotation structure facing away from the bottom wall of the groove.

[0007] The cover plate assembly provided in the embodiment of the present application includes a cover plate, a screw rod and a limiting protrusion, a groove is provided on one side of the cover plate, the limiting protrusion is provided on the bottom wall of the groove, a crimping edge is provided on one end of the limiting protrusion away from the bottom wall of the groove, and an anti-rotation structure is provided on the end of the screw rod; during assembly, the anti-rotation structure is installed inside the limiting protrusion and cooperates with the inner wall surface of the limiting protrusion to prevent rotation, thereby realizing anti-rotation cooperation between the screw rod and the limiting protrusion, and the crimping edge is crimped on the side of the anti-rotation structure facing away from the bottom wall of the groove to prevent the screw rod from falling out of the limiting protrusion. The above anti-rotation structure can realize both anti-rotation and anti-slip effects, simplifying the processing of the screw rod and reducing the processing cost of the screw rod.

[0008] In some embodiments, a slope is provided on a side of the anti-rotation structure facing away from the bottom wall of the groove, and the crimping edge is crimped onto the slope.

[0009] In some embodiments, the limiting protrusion is an annular protrusion, and the crimping edge is an annular edge.

[0010] In some embodiments, the thickness of the crimping edge gradually decreases in a direction away from the bottom wall of the groove.

[0011] In some embodiments, the anti-rotation structure is integrally formed with the screw.

[0012] In some embodiments, the anti-rotation structure includes a plurality of anti-rotation protrusions and a plurality of anti-rotation recesses, wherein the plurality of anti-rotation protrusions are arranged at intervals along the circumference of the screw, and the anti-rotation recess is located between two adjacent anti-rotation protrusions; the inner side surface of the limiting protrusion is provided with a mating protrusion located in the anti-rotation recess.

[0013] In some embodiments, the crimping edge is crimped onto the anti-rotation protrusion, and a portion of the crimping edge corresponding to the anti-rotation recess is recessed into the anti-rotation recess.

[0014] In some embodiments, the limiting protrusion is integrally formed with the bottom wall of the groove.

[0015] In some embodiments, the cover plate assembly also includes a support plate and a nut, the notch of the groove is provided with a support step, the support plate is supported on the support step, the support plate is provided with a through hole, the screw rod passes through the through hole, and the nut is threadedly connected to the screw rod and is located on the side of the support plate facing away from the bottom wall of the groove.

[0016] A second aspect of the present application provides a filter, which includes the cover plate assembly as described in the first aspect.

[0017] The filter adopts all the embodiments of the above-mentioned cover plate assembly, and thus has at least all the beneficial effects of the above-mentioned embodiments, which will not be described one by one here.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or conventional technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 is a schematic diagram of the structure of filters provided in some embodiments of the present application;

[0021] Figure 2 yes Figure 1 a cross-sectional view of the filter shown;

[0022] Figure 3 yes Figure 2 a cross-sectional view of the middle cover assembly;

[0023] Figure 4 yes Figure 3 An exploded view of the cover assembly shown;

[0024] Figure 5 yes Figure 4 Schematic diagram of the structure of the middle screw;

[0025] Figure 6 yes Figure 4 Schematic diagram of the structure of the middle cover;

[0026] Figure 7 is a schematic diagram of the structure of the cover plate before the screw is pressed into the cover plate;

[0027] Figure 8 yes Figure 7 A cross-sectional view of the cover plate shown.

[0028] The meanings of the marks in the figure are:

[0029] 100, filter;

[0030] 10. Cover plate assembly;

[0031] 11. cover plate; 111. groove; 1111. supporting step;

[0032] 12. Limiting protrusion; 121. Pressing edge; 122. Matching protrusion;

[0033] 13. Screw rod; 131. Anti-rotation structure; 1311. Anti-rotation concave portion; 1312. Anti-rotation convex portion; 1313. Anti-rotation body; 132. Inclined surface;

[0034] 14. Support plate; 141. Perforation;

[0035] 15. Nut;

[0036] 20. Cavity;

[0037] 21. Install the column;

[0038] 22. Resonant rod. DETAILED DESCRIPTION

[0039] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0041] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0042] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0044] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0045] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0047] The first embodiment of the present application provides a cover plate assembly. Figure 2 and Figure 3 The cover plate assembly 10 includes a cover plate 11, a screw rod 13 and a limiting protrusion 12. The cover plate 11 is provided with a groove 111 on one side in the thickness direction thereof. The limiting protrusion 12 is provided on the bottom wall of the groove 111. An anti-rotation structure 131 is provided at the end of the screw rod 13. A crimping edge 121 is provided at one end of the limiting protrusion 12 away from the bottom wall of the groove 111. When the screw rod 13 and the limiting protrusion 12 are assembled in place, the anti-rotation structure 131 is located on the inner side of the limiting protrusion 12 and cooperates with the inner wall surface of the limiting protrusion 12 to prevent rotation. The crimping edge 121 is crimped on the side of the anti-rotation structure 131 facing away from the bottom wall of the groove 111.

[0048] The cover plate 11 is used to cover the cavity 20 to form a closed cavity. The cover plate 11 is made of metal material, for example, aluminum, copper, iron, etc. The shape of the cover plate 11 can be various, as long as it can cover the cavity 20, for example, the cover plate 11 can be a square cover plate, a circular cover plate, etc.

[0049] The thickness direction of the cover plate 11 refers to the depth direction of the cavity 20, that is, Figure 2 Direction of arrow shown in .

[0050] It can be understood that the groove 111 is provided on the side of the cover plate 11 facing away from the cavity 20, that is, the opening of the groove 111 faces away from the cavity 20; and, after the cover plate 11 is assembled on the cavity 20, the groove 111 is arranged corresponding to the resonant rod 22 in the cavity 20. The bottom wall of the groove 111 is relatively thin to facilitate deformation.

[0051] In the present application, the shapes of the groove 111 can be various, for example, the groove 111 is a circular groove, a square groove, etc.

[0052] The limiting protrusion 12 is made of a metal material, for example, aluminum, steel, etc. The limiting protrusion 12 is arranged on the bottom wall of the groove 111. It can be understood that the limiting protrusion 12 can be integrally formed with the bottom wall of the groove 111, in which case the material of the limiting protrusion 12 is the same as the material of the bottom wall of the groove 111; or, the limiting protrusion 12 is fixed (can be but not limited to welding) on ​​the bottom wall of the groove 111, in which case the material of the limiting protrusion 12 can be the same as or different from the material of the bottom wall of the groove 111.

[0053] It can be understood that the center line of the limiting protrusion 12 can coincide with the center line of the resonance rod 22, or the center line of the limiting protrusion 12 can deviate from the center line of the resonance rod 22, but not too much, so as to avoid affecting the adjustment of the distance between the bottom wall of the groove 111 and the resonance rod 22, thereby affecting the adjustment of the resonance frequency.

[0054] Among them, the shape of the limiting protrusion 12 can be various, for example, the number of the limiting protrusion 12 is one, and its shape can be an annular protrusion, such as a circular ring, a rectangular ring, etc.; or, the number of the limiting protrusion 12 is multiple, and multiple limiting protrusions 12 are arranged around the anti-rotation structure 131.

[0055] It can be understood that the cross section of the limiting protrusion 12 can be a rectangle, an isosceles trapezoid, a right-angle trapezoid, etc. The cross section of the limiting protrusion 12 refers to the section of the limiting protrusion 12 cut along a direction perpendicular to the bottom wall of the cavity 20 .

[0056] The screw rod 13 is a rod with external threads. It can be understood that the anti-rotation structure 131 can be integrally formed with the screw rod 13. In this case, the anti-rotation structure 131 and the screw rod 13 together form a screw; the anti-rotation structure 131 can also be fixed (can be but not limited to welding) on ​​the screw rod 13.

[0057] The anti-rotation structure 131 is arranged at the end of the screw rod 13, and the anti-rotation structure 131 cooperates with the inner wall surface of the limiting protrusion 12 to prevent rotation, so that the anti-rotation structure 131 and the limiting protrusion 12 remain relatively fixed in the circumferential direction of the screw rod 13, so that the screw rod 13 will not rotate relative to the cover plate 11 along the circumferential direction of the screw rod 13; wherein, the diameter of the anti-rotation structure 131 is larger than the diameter of the screw rod 13, so that the screw rod 13 will not contact the inner wall surface of the limiting protrusion 12.

[0058] The crimping edge 121 is crimped onto the bottom wall of the anti-rotation structure 131 facing away from the groove 111 to limit the anti-rotation structure 131 in the limiting protrusion 12 along the axial direction of the screw 13 to prevent the screw 13 from escaping from the limiting protrusion 12 along its axial direction.

[0059] The cover plate assembly 10 provided in the embodiment of the present application includes a cover plate 11, a screw rod 13 and a limiting protrusion 12. A groove 111 is provided on one side of the cover plate 11. The limiting protrusion 12 is provided on the bottom wall of the groove 111. A crimping edge 121 is provided on one end of the limiting protrusion 12 away from the bottom wall of the groove 111. An anti-rotation structure 131 is provided on the end of the screw rod 13. During assembly, the anti-rotation structure 131 is installed inside the limiting protrusion 12 to cooperate with the inner wall surface of the limiting protrusion 12 to prevent rotation, thereby realizing anti-rotation cooperation between the screw rod 13 and the limiting protrusion 12. The crimping edge 121 is crimped on the side of the anti-rotation structure 131 facing away from the bottom wall of the groove 111 to prevent the screw rod 13 from falling out of the limiting protrusion 12. The above-mentioned anti-rotation structure 131 can realize both anti-rotation and anti-falling effects, simplifying the processing of the screw rod 13 and reducing the processing cost of the screw rod 13.

[0060] Please also refer to Figure 3 and Figure 5 In some embodiments, a slope 132 is provided on a side of the anti-rotation structure 131 facing away from the bottom wall of the groove 111 , and the crimping edge 121 is crimped onto the slope 132 .

[0061] The inclined surface 132 is arranged close to the edge of the anti-rotation structure 131 to facilitate the crimping of the crimping edge 121. It can be understood that the inclined surface 132 can be an annular inclined surface arranged along the circumference of the screw 13, and the generatrix of the annular inclined surface can be a straight line, that is, the inclined surface 132 can be a straight inclined surface, and the generatrix of the annular inclined surface can also be an arc line, that is, the inclined surface 132 can also be an arc-shaped inclined surface; or, the inclined surface 132 includes a plurality of inclined surface areas, and the plurality of inclined surface areas are arranged at intervals along the circumference of the screw 13.

[0062] When the inclined surface 132 is a straight inclined surface, the angle between the inclined surface 132 and the bottom wall of the groove 111 may be 30°, 45°, 60°, etc.

[0063] Optionally, a side of the anti-rotation structure 131 facing the bottom wall of the groove 111 is a plane to ensure that the anti-rotation structure 131 is in stable contact with the bottom wall of the groove 111 .

[0064] like Figure 7 and Figure 8 As shown, before the crimping edge 121 is crimped onto the inclined surface 132, the crimping edge 121 is not deformed, and the inner side wall of the crimping edge 121 is flush with the inner side wall of the limiting protrusion 12, allowing the anti-rotation structure 131 to be inserted into the limiting protrusion 12; Figure 3As shown, after the anti-rotation structure 131 is inserted into the limiting protrusion 12 , the crimping edge 121 is deformed under the action of external force and tilts toward the center direction of the limiting protrusion 12 as a whole, so that the crimping edge 121 is crimped on the inclined surface 132 .

[0065] Compared with crimping on a plane, by crimping the crimping edge 121 on the inclined surface 132 of the anti-rotation structure 131 , the inclination angle of the crimping edge 121 during the crimping process is smaller, which is beneficial for the crimping edge 121 to crimp the anti-rotation structure 131 .

[0066] In other embodiments, a plane is provided on the side of the bottom wall of the anti-rotation structure 131 facing away from the groove 111, and the crimping edge 121 is crimped on the plane; or, a plane and a slope 132 are provided on the side of the bottom wall of the anti-rotation structure 131 facing away from the groove 111, and the crimping edge 121 is crimped on both the plane and the slope 132.

[0067] Please refer to Figure 6 In some embodiments, the limiting protrusion 12 is an annular protrusion, and the crimping edge 121 is an annular edge.

[0068] The crimping edge 121 is designed as an annular edge to increase the contact area between the crimping edge 121 and the anti-rotation structure 131, thereby increasing the crimping force, ensuring that the crimping edge 121 is stably crimped to the anti-rotation structure 131, and further preventing the anti-rotation structure 131 from escaping along the axial direction of the screw rod 13.

[0069] In other embodiments, the crimping edge 121 includes a plurality of crimping segments arranged at intervals along the circumference of the screw rod 13 . Since there is a gap between two adjacent crimping segments, it is beneficial for the crimping segments to deform toward the center position of the limiting protrusion 12 .

[0070] like Figure 3 As shown, in some embodiments, the thickness of the crimping edge 121 gradually decreases in a direction away from the bottom wall of the groove 111 .

[0071] It can be understood that the thickness of the end of the crimping edge 121 close to the bottom wall of the groove 111 is greater than the thickness of the end of the crimping edge 121 away from the bottom wall of the groove 111 .

[0072] Optionally, the thickness of one end of the crimping edge 121 close to the bottom wall of the groove 111 is the same as the thickness of the limiting protrusion 12 .

[0073] It is understandable that Figure 8 As shown, before the crimping edge 121 is crimped to the anti-rotation structure 131, the cross section of the crimping edge 121 can be a right-angled trapezoid, and the right-angled side of the right-angled trapezoid is located on the inner side of the crimping edge 121; or, before the crimping edge 121 is crimped to the anti-rotation structure 131, the cross section of the crimping edge 121 can be an isosceles trapezoid. The cross section of the crimping edge 121 refers to the section of the crimping edge 121 cut along a direction perpendicular to the bottom wall of the cavity 20.

[0074] By adopting the above technical solution, the thickness of the crimping edge 121 changes smoothly in the direction away from the bottom wall of the groove 111, which is beneficial to the deformation of the crimping edge 121 while facilitating the molding of the crimping edge 121.

[0075] In other embodiments, the thickness of the crimping edge 121 is uniform in the direction away from the bottom wall of the groove 111 , that is, before the crimping edge 121 is crimped onto the anti-rotation structure 131 , the cross section of the crimping edge 121 is rectangular.

[0076] In some embodiments, the anti-rotation structure 131 is integrally formed with the screw rod 13 .

[0077] Optionally, the anti-rotation structure 131 and the screw rod 13 may be integrally formed by cold heading, which is a simple and low-cost forming method.

[0078] In other embodiments, the anti-rotation structure 131 and the screw rod 13 may be fixedly connected (including but not limited to welding).

[0079] Please also refer to Figure 5 and Figure 6 In some embodiments, the anti-rotation structure 131 includes a plurality of anti-rotation protrusions 1312 and a plurality of anti-rotation recesses 1311. The plurality of anti-rotation protrusions 1312 are arranged at intervals along the circumference of the screw 13, and the anti-rotation recess 1311 is located between two adjacent anti-rotation protrusions 1312. The inner side surface of the limiting protrusion 12 is provided with a matching protrusion 122 located in the anti-rotation recess 1311.

[0080] It can be understood that the number of the anti-rotation protrusions 1312 and the anti-rotation recesses 1311 are the same, for example, they can be two or three or more.

[0081] The anti-rotation structure 131 further includes an anti-rotation body 1313 , and the anti-rotation recess 1311 and the anti-rotation protrusion 1312 are both disposed on the outer peripheral wall of the anti-rotation body 1313 .

[0082] Alternatively, if Figure 7 and Figure 8 As shown, before the anti-rotation structure 131 is inserted into the limiting protrusion 12, there is no matching protrusion 122 in the limiting protrusion 12; the outer diameter of the anti-rotation structure 131 is larger than the inner diameter of the limiting protrusion 12, and the anti-rotation structure 131 is inserted into the limiting protrusion 12 in an interference fit manner, and the anti-rotation protrusion 1312 squeezes the limiting protrusion 12, so that a part of the limiting protrusion 12 is squeezed into the anti-rotation recess 1311 to form the matching protrusion 122. In this way, before the anti-rotation structure 131 is inserted into the limiting protrusion 12, it is not necessary to set the matching protrusion 122 on the inner side of the limiting protrusion 12, which is conducive to the processing of the limiting protrusion 12; at the same time, it is ensured that the anti-rotation structure 131 will not move in the radial direction of the screw 13.

[0083] In other embodiments, the matching protrusion 122 may be directly provided on the inner side of the limiting protrusion 12. In this case, the outer diameter of the anti-rotation structure 131 is equal to or smaller than the inner diameter of the limiting protrusion 12. In this way, the anti-rotation structure 131 is conveniently inserted into the inner side of the limiting protrusion 12.

[0084] In other embodiments, the anti-rotation structure 131 includes an anti-rotation body 1313 and knurling or barbs disposed on the outer peripheral wall of the anti-rotation body 1313 .

[0085] In some embodiments, the crimping edge 121 is crimped onto the anti-rotation protrusion 1312 , and a portion of the crimping edge 121 corresponding to the anti-rotation recess 1311 is recessed into the anti-rotation recess 1311 .

[0086] The crimping edge 121 is crimped onto the anti-rotation protrusion 1312 , which can be understood as that a part or all of the inclined surface 132 is disposed on the anti-rotation protrusion 1312 .

[0087] By adopting the above technical solution, the concave portion of the crimping edge 121 can cooperate with the anti-rotation recess 1311 to further prevent rotation.

[0088] In some embodiments, the limiting protrusion 12 is integrally formed with the bottom wall of the groove 111 .

[0089] Optionally, the limiting protrusion 12 is located at the center position or close to the center position of the bottom wall of the groove 111 , and realizes uniform deformation of the bottom wall of the groove 111 when subjected to the force of the screw rod 13 .

[0090] Compared with fixing the limiting protrusion 12 on the bottom wall of the groove 111 , by integrally forming the limiting protrusion 12 and the bottom wall of the groove 111 , the fixing process can be reduced and the production efficiency can be improved.

[0091] In other embodiments, the limiting protrusion 12 may be fixed (including but not limited to welding) on ​​the bottom wall of the groove 111 to reduce the difficulty of integrally forming the limiting protrusion 12 and the bottom wall of the groove 111 .

[0092] Please also refer to Figure 3 and Figure 4 In some embodiments, the cover plate assembly 10 further includes a support plate 14 and a nut 15. The notch of the groove 111 is provided with a support step 1111, the support plate 14 is supported on the support step 1111, the support plate 14 is provided with a through hole 141, the screw 13 passes through the through hole 141, and the nut 15 is threadedly connected to the screw 13 and is located on the side of the support plate 14 facing away from the bottom wall of the groove 111.

[0093] The support plate 14 is used to support the nut 15. In the present application, the support plate 14 can have a variety of shapes as long as it can support the nut 15. For example, the support plate 14 can be a circular plate, and correspondingly, the support step 1111 is a circular ring structure; or the support plate 14 can be a rectangular plate, and correspondingly, the support step 1111 is a rectangular ring structure; or the support plate 14 is a strip plate, in which case, the support step 1111 is a circular ring structure, a rectangular ring structure, etc.

[0094] The diameter of the through hole 141 is larger than the diameter of the screw rod 13 so that the screw rod 13 can pass through the through hole 141 ; at the same time, the diameter of the through hole 141 cannot be much larger than the diameter of the screw rod 13 so as to ensure that the nut 15 can be supported on the edge of the through hole 141 .

[0095] It should be noted that the support plate 14 has good rigidity and hardly deforms under the action of external force, while the bottom wall of the groove 111 is relatively thin and may deform under the action of external force.

[0096] After the screw rod 13 passes through the through hole 141, the screw rod 13 is fixed in the limiting protrusion 12 by means of the anti-rotation structure 131 and the crimping edge 121, thereby realizing the anti-rotation and anti-slip properties of the screw rod 13; when the nut 15 is screwed, the nut 15 is supported by the support plate 14, and the screw rod 13 can move along its axial direction relative to the support plate 14, thereby driving the bottom wall of the groove 111 to move relative to the support plate 14, that is, adjusting the distance between the bottom wall of the groove 111 and the resonance rod 22 in the cavity 20, thereby realizing the adjustment of the resonant frequency.

[0097] In this embodiment, the support plate 14 is adapted to the support step 1111, and the support step 1111 can limit the support plate 14 to ensure that the through hole 141 on the support plate 14 is aligned with the limiting protrusion 12; at the same time, since the support step 1111 is sunken a certain distance relative to the upper surface of the cover plate 11, the support plate 14 is supported on the support step 1111, which can make the support plate 14 flush with the cover plate 11, thereby improving the aesthetics of the filter 100.

[0098] In other embodiments, the notch of the groove 111 may not be provided with the supporting step 1111 , and the supporting plate 14 is supported on the side of the cover plate 11 facing away from the groove bottom of the groove 111 .

[0099] The second aspect of the present application provides a filter 100. The filter 100 includes the cover plate assembly 10 as described in the first aspect. Figure 1 and Figure 2 The filter 100 further includes a cavity 20 , and the cover plate assembly 10 is fixed on the cavity 20 , wherein the cavity 20 is made of a metal material, such as aluminum, copper, iron, etc.

[0100] The cover plate assembly 10 includes a cover plate 11, and there are many ways to fix the cover plate 11 on the cavity 20. For example, a fixing hole is provided on the cover plate 11, and the cover plate 11 is fixed to the cavity 20 by fixing screws. Of course, the cover plate 11 can also be directly welded and fixed to the cavity 20, in which case the cover plate 11 does not need to be provided with a fixing hole.

[0101] A resonant rod 22 is disposed in the cavity 20, and the resonant rod 22 is arranged corresponding to the groove 111 on the cover plate 11. The resonant rod 22 may be a metal resonant rod or a dielectric resonant rod.

[0102] It can be understood that the resonance rod 22 can be directly disposed on the bottom wall of the cavity 20 ; or, a mounting column 21 is disposed in the cavity 20 , and the resonance rod 22 is fixed on the mounting column 21 .

[0103] When the resonance rod 22 is directly arranged on the bottom wall of the cavity 20, the resonance rod 22 can be integrally formed with the bottom wall of the cavity 20, and the resonance rod 22 can also be fixed on the bottom wall of the cavity 20 (which can be but is not limited to welding, crimping, plugging, fastener connection, threaded connection).

[0104] When the resonance rod 22 is fixed on the mounting column 21, the mounting column 21 can be integrally formed with the bottom wall of the cavity 20, and the mounting column 21 can also be fixed (can be but not limited to welding) on ​​the bottom wall of the cavity 20; the resonance rod 22 can be fixed on the mounting column 21 by means of screw connection, threaded connection, welding, clamping, interference connection, etc.

[0105] The number of the resonant rods 22 in the cavity 20 can be set as required, such as one, two, or three or more.

[0106] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A cover plate assembly, characterized in that: It includes a cover plate, a screw rod and a limiting protrusion, the cover plate is provided with a groove on one side in the thickness direction of the cover plate, the limiting protrusion is arranged on the bottom wall of the groove, the end of the screw rod is provided with an anti-rotation structure, the anti-rotation structure is located on the inner side of the limiting protrusion and cooperates with the inner wall surface of the limiting protrusion for anti-rotation; the limiting protrusion is provided with a crimping edge at one end away from the bottom wall of the groove, and the crimping edge is crimped on the side of the anti-rotation structure facing away from the bottom wall of the groove.

2. The cover plate assembly according to claim 1, characterized in that: A slope is provided on one side of the anti-rotation structure facing away from the bottom wall of the groove, and the crimping edge is crimped on the slope.

3. The cover plate assembly according to claim 1, wherein: The limiting protrusion is an annular protrusion, and the crimping edge is an annular edge.

4. The cover plate assembly according to claim 1, wherein: The thickness of the crimping edge gradually decreases in a direction away from the bottom wall of the groove.

5. The cover plate assembly according to claim 1, wherein: The anti-rotation structure is integrally formed with the screw.

6. The cover plate assembly according to any one of claims 1 to 5, characterized in that: The anti-rotation structure includes a plurality of anti-rotation protrusions and a plurality of anti-rotation recesses. The plurality of anti-rotation protrusions are arranged at intervals along the circumference of the screw, and the anti-rotation recess is located between two adjacent anti-rotation protrusions. The inner side surface of the limiting protrusion is convexly provided with a matching protrusion located in the anti-rotation recess.

7. The cover plate assembly according to claim 6, characterized in that: The crimping edge is crimped onto the anti-rotation protrusion, and a portion of the crimping edge corresponding to the anti-rotation concave portion is recessed into the anti-rotation concave portion.

8. The cover plate assembly according to any one of claims 1 to 5, characterized in that: The limiting protrusion is integrally formed with the bottom wall of the groove.

9. The cover plate assembly according to any one of claims 1 to 5, characterized in that: The cover plate assembly also includes a support plate and a nut. The notch of the groove is provided with a support step, the support plate is supported on the support step, the support plate is provided with a through hole, the screw rod passes through the through hole, and the nut is threadedly connected to the screw rod and is located on the side of the support plate facing away from the bottom wall of the groove.

10. A filter, characterized in that: The invention comprises a cover plate assembly as claimed in any one of claims 1 to 9.

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