Filter

Abstract

The utility model relates to the field of communication equipment, in particular to a filter, which comprises a shell, an accommodating cavity is arranged in the shell, and a fixing hole is arranged on the bottom surface of the accommodating cavity; a first screw hole penetrates through the shell; the flying rod is arranged in the accommodating cavity, and a coupling enhancing hole and a locking hole are formed in the flying rod in a penetrating manner; the zero-point debugging screw rod movably penetrates through the first screw hole, and one end of the zero-point debugging screw rod faces the coupling enhancing hole; the plurality of resonance rods are provided with penetrating cavities in a penetrating manner, and the penetrating cavity of one resonance rod is communicated with the locking hole; the locking piece movably penetrates through the penetrating cavity and is inserted into the locking hole and the fixing hole at the same time. The locking hole is communicated with the penetrating cavity, meanwhile, the locking hole is communicated with the fixing hole, and after the locking piece penetrates through the penetrating cavity, the locking hole and the fixing hole at the same time, the fly rod is fixed, and no extra fixing structure is needed for fixing the fly rod. When the fly rod is disassembled and assembled, the fly rod can be assembled or disassembled only by penetrating or taking out the locking piece from the fixing hole, the locking hole and the penetrating cavity, and the whole disassembling and assembling process is simplified.

Description

Technical Field

[0001] This utility model relates to the technical field of communication equipment, and in particular to a filter. Background Technology

[0002] Communication signals are susceptible to electromagnetic interference and equipment aging, which can easily lead to errors during transmission. Therefore, filters are used to remove impurities from the signal, ensuring data integrity. For example, in wireless communication systems, electromagnetic interference generated by various electronic devices can mix into the signal; filters can effectively remove this interference, ensuring stable signal transmission.

[0003] In some related technologies, patent publication number CN222463396U discloses a low-frequency broadband filter. This solution also discloses a flying rod disposed between the second and fourth resonators, with a fixing component mounted on the flying rod. The flying rod is installed in the inner cavity of the metal housing through the fixing component. Because this solution requires a fixing component to be disposed in the inner cavity of the metal housing for fixing and supporting the flying rod, that is, the fixing component needs to be built into the inner cavity of the metal housing, it occupies the assembly space of the internal cavity. Moreover, one end of the flying rod is welded to the bottom side wall of the second resonator. When the flying rod or the second resonator malfunctions and needs to be repaired or replaced, the welded part needs to be removed, which is not only complicated but may also damage the inner cavity of the housing, the resonator and other components. Utility Model Content

[0004] To overcome the shortcomings of existing technical solutions, this utility model provides a filter.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A filter, the filter comprising:

[0007] The outer casing has an internal cavity, and a fixing hole is provided on the bottom surface of the cavity; a first screw hole is provided at the top of the outer casing.

[0008] The flying rod is built into the accommodating cavity and has a coupling enhancement hole and a locking hole for corresponding communication with the fixing hole.

[0009] A zero-point adjustment screw, wherein the zero-point adjustment screw is movably inserted through the first screw hole and one end of the screw is oriented toward the coupling enhancement hole;

[0010] Multiple resonant rods, each of which has a through cavity, one of which is connected to the locking hole;

[0011] A locking element, which is movably inserted through the through cavity and simultaneously inserted into the locking hole and the fixing hole.

[0012] As a preferred technical solution of this utility model, the cavity wall of the through cavity is provided with a first annular inclined surface;

[0013] One end of the locking member is provided with a limiting block, and the limiting block is provided with a second annular inclined surface for engaging with the first annular inclined surface.

[0014] As a preferred technical solution of this utility model, the outer side of the locking member is provided with threads; the fixing hole is a threaded hole, and the locking member is movably inserted into the threaded hole through the threads.

[0015] As a preferred technical solution of this utility model, the fly stick includes a first fly stick block, a second fly stick block, and a third fly stick block connected in sequence; the locking hole passes through the first fly stick block, and the coupling enhancement hole passes through the third fly stick block.

[0016] As a preferred technical solution of this utility model, the top end of the outer shell has a plurality of second screw holes;

[0017] The filter also includes a plurality of frequency tuning screws, each of which is movably inserted through each of the second screw holes, and the same end of each of the frequency tuning screws is directed toward each of the through cavities.

[0018] As a preferred technical solution of this utility model, the top end of the outer shell has a plurality of third screw holes;

[0019] The filter also includes multiple coupling adjustment screws, each of which is movably inserted through each of the third screw holes.

[0020] As a preferred technical solution of this utility model, the bottom surface of the accommodating cavity is provided with a support portion; the fixing hole is provided in the support portion.

[0021] As a preferred technical solution of this utility model, the bottom of the outer shell is provided with multiple support bars at intervals.

[0022] As a preferred technical solution of this utility model, the outer shell includes a housing and a cover plate, the cover plate is detachably disposed on the top of the housing, and the accommodating cavity is located between the cover plate and the housing;

[0023] The first screw hole extends through the cover plate.

[0024] As a preferred technical solution of this utility model, a column is provided in the accommodating cavity, and a fourth screw hole is opened at the top of the column; the cover plate has a through hole for communicating with the fourth screw hole;

[0025] The filter also includes a bolt, which passes through both the through hole and the fourth screw hole.

[0026] Compared with the prior art, the beneficial effects of this utility model are:

[0027] The flying rod is connected to the first through cavity of the first resonant rod through the locking hole of the flying rod, and at the same time, the locking hole of the flying rod is connected to the fixing hole on the bottom surface of the accommodating cavity. After the locking member is inserted through the first through cavity, the locking hole and the fixing hole, the flying rod is fixed. There is no need to set an additional fixing structure in the accommodating cavity to fix the flying rod, thus improving the utilization rate of the accommodating cavity and making the internal structure more compact. If the flying rod needs to be disassembled, the locking member can be removed from the fixing hole, the locking hole and the first through cavity to disassemble the flying rod, thus simplifying the entire disassembly process. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is an overall structural diagram of an embodiment of the present utility model.

[0030] Figure 2 This is an exploded view of the structure of an embodiment of this utility model.

[0031] Figure 3 This is an exploded view of the structure of an embodiment of this utility model.

[0032] Figure 4 This is an internal structural diagram of an embodiment of the present utility model.

[0033] Figure 5 yes Figure 4 Exploded view of the structure.

[0034] Figure 6 This is a structural diagram of the fly stick according to an embodiment of the present invention.

[0035] Numbers in the diagram

[0036] 1. Outer shell; 11. Housing; 111. Receiving cavity; 112. Fixing hole; 12. Cover plate; 121. First screw hole; 122. Second screw hole; 123. Third screw hole; 124. Through hole; 13. Support part; 14. Support bar; 15. Column; 151. Fourth screw hole;

[0037] 2. Flying rod; 21. First flying rod block; 22. Second flying rod block; 23. Third flying rod block; 24. Coupling reinforcement hole; 25. Locking hole;

[0038] 3. Zero-point adjustment screw;

[0039] 4. Resonant rod; 41. Through cavity; 42. First annular inclined plane;

[0040] 5. Locking component; 51. Limiting block; 52. Second annular inclined surface;

[0041] 6. Frequency modulation screw.

[0042] 7. Couple the adjustment screw. Detailed Implementation

[0043] To make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following describes this application in further detail with reference to the accompanying drawings and embodiments.

[0044] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0045] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or indirectly on that other component.

[0046] When a component is said to be "connected to" another component, it can be directly connected to the other component or indirectly connected to that other component.

[0047] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0049] In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically defined.

[0050] To address the issues of existing filters having excessive internal space occupied by their internal structures and the cumbersome disassembly process of the fly rod, this invention provides a filter.

[0051] The following describes in detail the specific structure of a filter provided by an embodiment of this utility model, according to the appendix. Figure 1-6 As shown, the specific structure of the filter includes a housing 1, a fly rod 2, a zero-point adjustment screw 3, a resonant rod 4, and a locking component 5.

[0052] according to Figure 1 and Figure 2 As shown, the outer shell 1 has a receiving cavity 111 inside, and a fixing hole 112 is opened on the bottom surface of the receiving cavity 111; a first screw hole 121 is passed through the top of the outer shell 1.

[0053] Specifically, the accommodating cavity 111 is used to house the internal components of the filter, such as the flybar 2 and the resonant rod 4, allowing these components to be rationally arranged within a limited space, ensuring the relative positional relationship between the components, and thus enabling the filter to function normally. The accommodating cavity 111 also isolates the internal components such as the flybar 2 and the resonant rod 4 from the external environment, preventing the entry of external dust, debris, etc., and avoiding damage or performance impact from external contaminants. Simultaneously, it also protects the internal components from external impacts to a certain extent, improving the reliability and stability of the filter. Furthermore, the accommodating cavity 111 can also act as a shield, providing a certain degree of shielding for the electromagnetic signals inside the filter, reducing the leakage of internal electromagnetic signals to the outside, and preventing external electromagnetic interference from entering the accommodating cavity 111 and affecting the normal operation of the filter, thus contributing to improved electromagnetic compatibility of the filter.

[0054] according to Figure 4 and Figure 5 As shown, the flying rod 2 is built into the accommodating cavity 111. The flying rod 2 has a coupling enhancement hole 24 and a locking hole 25 for corresponding communication with the fixing hole 112. The zero-point adjustment screw 3 is movably passed through the first screw hole 121 and one end of it faces the coupling enhancement hole 24.

[0055] Specifically, when the zero-point adjustment screw 3 is inserted through the first screw hole 121 at the top of the housing 1, one end of the zero-point adjustment screw 3 faces the coupling enhancement hole 24. When the entire filter is working, the zero-point adjustment screw 3 can be rotated to adjust the depth of insertion into the coupling enhancement hole 24. Since the position change of the zero-point adjustment screw 3 will affect the electromagnetic field distribution around the fly rod 2, thereby changing the coupling degree between the fly rod 2 and other resonant components, the filter signal coupling strength can be finely adjusted by precisely adjusting the zero-point adjustment screw 3, so that the frequency response and other performance indicators of the filter can meet the specified requirements, thereby satisfying different filtering needs.

[0056] It should be noted that by adjusting the zero-point adjustment screw 3, moving one end closer to or further away from the coupling enhancement hole 24 of the fly rod 2, the distance between the zero-point adjustment screw 3 and the fly rod 2 can be changed. Specifically, when the zero-point adjustment screw 3 is deeper, the electric field strength between the zero-point adjustment screw 3 and the fly rod 2 is increased, and vice versa. This change in electric field strength alters the charge distribution of the fly rod 2, thereby affecting its capacitive characteristics and adjusting the capacitive coupling value. This, in turn, changes the electromagnetic environment. Thus, by precisely controlling the depth of the zero-point adjustment screw 3, the capacitive coupling value of the entire filter can be adjusted to the required value to meet the performance requirements of the filter.

[0057] It should also be noted that the coupling enhancement hole 24 of the fly stick 2 is used to change the electromagnetic distribution around the fly stick 2. For example, when the capacitive zero-point adjustment screw 3 is close to the coupling enhancement hole 24, the electromagnetic field at the coupling enhancement hole 24 is distorted, and the electromagnetic coupling between it and the zero-point adjustment screw 3 is enhanced, thereby adjusting the capacitance characteristics of the fly stick, that is, adjusting the capacitive zero point and capacitive coupling value.

[0058] according to Figure 5 As shown, multiple resonant rods 4 are all connected by a through cavity 41, and the through cavity 41 of one of the resonant rods 4 is connected to the locking hole 25. The locking member 5 is movably inserted through the through cavity 41 and simultaneously inserted into the locking hole 25 and the fixing hole 112.

[0059] Specifically, the fly rod 2 is placed inside the designated position of the receiving cavity 111 so that the through cavity 41 is correspondingly connected to the locking hole 25 of the fly rod 2. At the same time, the fixing hole 112 on the bottom surface of the receiving cavity 111 is aligned with the locking hole 25. At this time, it is only necessary to move the locking member 5 through the through cavity 41 so that it can be inserted into both the locking hole 25 and the fixing hole 112, thereby tightly connecting the resonant rod 4, the fly rod 2 and the outer shell 1 (through the fixing hole 112 on the bottom surface of the receiving cavity 111). Thus, the through cavity 41 of the resonant rod 4 is used to connect with the locking hole 25 of the fly rod 2, and the locking member 5 is inserted through the through cavity 41. After passing through the cavity 41, the locking hole 25 of the flying rod 2, and the fixing hole 112 on the bottom surface of the accommodating cavity 111, the flying rod 2 is fixed. This arrangement makes full use of the space of the resonant rod 4 itself, avoiding the need to add other solid structures in the accommodating cavity 111 to fix the flying rod 2, thereby effectively saving the space of the accommodating cavity 111 and making the internal structure of the filter more compact. Compared with setting additional support structures or connecting parts in the accommodating cavity 111 to fix the flying rod 2, this utility model embodiment does not need to occupy additional space in the accommodating cavity 111, effectively improving the space utilization rate and reducing the space occupation of the accommodating cavity 111. Furthermore, during assembly, simply place the fly rod 2 into the receiving cavity 111, align the locking hole 25 with the fixing hole 112 and the through cavity 41, and then insert the locking piece 5 to complete the fixation of the fly rod 2. The entire process does not require complex positioning or installation steps, and the assembly of the fly rod 2 can be completed quickly. Conversely, when disassembling the fly rod 2, simply remove the locking piece 5 from the through cavity 41, the locking hole 25, and the fixing hole 112 to release the fixation of the fly rod 2 and remove it from the receiving cavity 111. There is no need for large-scale disassembly or adjustment of other components, which simplifies the disassembly process. Moreover, this setting makes the connection between the fly rod 2 and other components relatively independent, making it difficult to cause interference or influence on other components of the filter during disassembly and assembly, thus improving the convenience of maintenance and repair.

[0060] according to Figure 3 As shown, in some specific embodiments, the top of the outer shell 1 has a plurality of second screw holes 122; the filter also includes a plurality of frequency tuning screws 6; each frequency tuning screw 6 is movably inserted through each of the second screw holes 122, and the same end of each frequency tuning screw 6 is respectively oriented toward each through cavity 41.

[0061] Specifically, the multiple second screw holes 122 penetrating the top of the outer casing 1 are used to allow one end of each tuning screw 6 to pass into the interior of the receiving cavity 111. That is, each second screw hole 122 corresponds to a resonant rod 4, so that the tuning screw 6 can be accurately aligned with the through cavity 41 of the corresponding resonant rod 4, providing precise positioning for subsequent frequency adjustment operations. When each tuning screw 6 is movably inserted through each second screw hole 122 and one end faces the through cavity 41 of the resonant rod 4, it is only necessary to rotate the tuning screw 6 to change the length of one end extending into the through cavity 41. Since the part of the tuning screw 6 extending into the through cavity 41 affects the electromagnetic field distribution inside the resonant rod 4, it changes the capacitance and inductance characteristics of the resonant rod 4. That is, according to the relationship between the resonant frequency and capacitance and inductance, by changing these characteristic parameters, the resonant frequency of the resonant rod 4 can be adjusted. In this way, by adjusting each frequency tuning screw 6 separately, the frequency of different resonant rods 4 can be adjusted independently, so that the filter can meet various complex filtering requirements and achieve precise screening and processing of signals of different frequencies.

[0062] It should be further noted that adjusting the frequency tuning screw 6 can change the resonant frequency of the resonant rod 4, thereby optimizing the frequency response curve of the filter. This results in a flatter response in the passband, ensuring distortion-free signal transmission within the passband; and higher attenuation in the stopband, effectively suppressing interference signals. This improves the rectangular coefficient of the filter, enhancing its filtering performance. Furthermore, since various harmonic components are generally present in actual signal processing, adjusting the frequency tuning screw 6 can suppress specific harmonic frequencies of the resonant rod 4, reducing the amplitude of harmonic signals to within acceptable limits. This reduces the impact of harmonic interference on the useful signal, improving signal quality and purity.

[0063] according to Figure 5 As shown, in some specific embodiments, the cavity wall of the through cavity 41 is provided with a first annular inclined surface 42, one end of the locking member 5 is provided with a limiting block 51, and the outer side of the limiting block 51 is provided with a second annular inclined surface 52 for fitting with the first annular inclined surface 42.

[0064] Specifically, when the locking member 5 is inserted into the through cavity 41, the second annular inclined surface 52 on the limiting block 51 and the first annular inclined surface 42 of the through cavity 41 are in contact with each other. Since the two inclined surfaces are compatible, their contact achieves a precise limiting function, ensuring the accurate position of the locking member 5 within the through cavity 41. This, in turn, ensures the installation accuracy of the flying rod 2 and other related components within the receiving cavity 111, maintaining the correct relative positional relationship between the components inside the filter. More specifically, when the first annular inclined surface 42 and the second annular inclined surface 52 are in contact, their large contact area allows the locking member 5 to be evenly distributed across the inclined surfaces when subjected to external force. For example, when the filter is subjected to vibration or other external forces during operation, the contact between the first annular inclined surface 42 and the second annular inclined surface 52 effectively avoids stress concentration, thereby preventing easy damage to components. Furthermore, the mutual compression between the two inclined surfaces generates friction, which helps prevent the locking element 5 from loosening within the through cavity 41, ensuring that components such as the fly rod 2 remain fixed during long-term use and maintaining the normal operating state of the filter. During installation, the second annular inclined surface 52 of the limiting block 51 can smoothly slide into the through cavity 41 along the first annular inclined surface 42, facilitating accurate insertion of the locking element 5 into the through cavity 41 by the operator, reducing installation difficulty and improving assembly efficiency.

[0065] In some specific embodiments, the outer side of the locking member 5 is provided with threads; the fixing hole 112 is a threaded hole, and the locking member 5 is inserted into the threaded hole by means of threads.

[0066] Specifically, the threads on the outer side of the locking member 5 match the threads of the fixing hole 112. When the locking member 5 is rotated, due to the helical structure of the threads, the locking member 5 is displaced axially and gradually screwed into the fixing hole 112. During this process, the meshing between the threads provides an axial driving force, allowing the locking member 5 to penetrate deeper into the fixing hole 112 until the fly rod 2 is securely fixed in the designated position. As the locking member 5 screws into the fixing hole 112, friction is generated between the threads. This friction not only prevents the locking member 5 from rotating in the opposite direction, but also generates a certain preload to press the fly rod 2 tightly into a specific position within the receiving cavity 111, ensuring that the fly rod 2 will not be displaced by external forces during the operation of the filter.

[0067] according to Figure 6 As shown, in some specific embodiments, the fly stick 2 includes a first fly stick block 21, a second fly stick block 22, and a third fly stick block 23 connected in sequence; a locking hole 25 passes through the first fly stick block 21, and a coupling enhancement hole 24 passes through the third fly stick block 23.

[0068] Specifically, when current flows through, each segment of the boom generates a magnetic field. Since the first boom block 21, the second boom block 22, and the third boom block 23 are close to each other and connected sequentially, electromagnetic induction occurs between the booms. According to the principle of mutual inductance, when the current in one boom changes, it induces an electromotive force in its adjacent boom, causing a redistribution of charge among the booms to form additional coupling current, thereby increasing the coupling capacity. For example, a change in current in the first boom block 21 induces an electromotive force in the second boom block 22, causing the charge in the second boom block 22 to move. This movement and redistribution of charge increases the coupling between the first boom block 21 and the second boom block 22. Similarly, a similar mutual inductance exists between the second boom block 22 and the third boom block 23, thus collectively increasing the overall coupling capacity.

[0069] according to Figure 3 As shown, in some specific embodiments, the top of the outer casing 1 has multiple third screw holes 123; the filter also includes multiple coupling adjustment screws 7, each of which is movably inserted through each third screw hole 123.

[0070] Specifically, due to machining tolerances, the electromagnetic coupling inside the accommodating cavity 111 may be uneven. Therefore, by adjusting the coupling adjustment screw 7, the new coupling path generated can compensate for this machining deviation. For example, if the coupling is too weak in a certain area within the accommodating cavity 111 due to machining errors, adjusting the coupling adjustment screw 7 can enhance the electromagnetic field, thus increasing electromagnetic coupling and correcting the coupling error. It can be seen that changing the position of the coupling adjustment screw 7 affects the strength of the surrounding electric field. According to the basic principles of electric fields, when one end of the coupling adjustment screw 7 penetrates deeper into the accommodating cavity 111, it can cause a change in the electric field strength; that is, when the coupling adjustment screw 7 penetrates deeper, the electric field strength increases; conversely, it weakens. In this way, the electric field strength at different locations can be precisely adjusted to compensate for the uneven electric field distribution caused by machining tolerances.

[0071] according to Figure 4 and Figure 5 As shown, in some specific embodiments, the bottom surface of the accommodating cavity 111 is provided with a support portion 13, and a fixing hole 112 is provided in the support portion 13.

[0072] Specifically, when the fly rod 2 is placed on top of the support part 13, the locking hole 25 is connected to the fixing hole 112, and also serves to directly support the weight of the fly rod 2, providing stable support. Since the fixing hole 112 is located on the support part 13, when the locking member 5 fixes the fly rod 2 on the support part 13, the weight of the fly rod 2 can be evenly transmitted to the bottom surface of the receiving cavity 111 through the support part 13, so that the fly rod 2 remains stable in the receiving cavity 111, avoiding shaking or displacement due to external forces or its own weight, and ensuring that the fly rod 2 can function normally during the operation of the filter.

[0073] In addition, when the flying rod 2 is fixed to the top of the support 13 by the locking member 5, the support 13 can disperse the fastening pressure generated by the locking member 5. This arrangement helps to prevent the bottom surface of the receiving cavity 111 from being deformed or damaged due to excessive local pressure, thereby protecting the integrity of the bottom surface of the receiving cavity 111. At the same time, it can also reduce the local pressure on the flying rod 2 to prevent the flying rod 2 from being damaged due to excessive pressure.

[0074] according to Figure 1 As shown, in some specific embodiments, the bottom of the outer casing 1 is provided with multiple support bars 14.

[0075] Specifically, the multiple support bars 14 can evenly distribute the weight of the filter on the placement surface; in addition, the multiple support bars 14 can increase the contact area between the entire filter and the placement surface, thereby expanding the support area, lowering the center of gravity of the filter, making the filter more stable when placed, and reducing the possibility of tipping over due to external impact or vibration.

[0076] It is understood that the support bar 14 of this utility model embodiment is provided with 3 bars, and the 3 support bars 14 are arranged at intervals.

[0077] In some specific embodiments, the housing 1 includes a housing 11 and a cover plate 12, the cover plate 12 being detachably disposed on the top of the housing 11 to form an accommodating cavity 111; a first screw hole 121 is located on the cover plate 12.

[0078] according to Figure 1 and Figure 2As shown, specifically, since the cover plate 12 is located on top of the housing 11, the two cooperate to form a receiving cavity 111, which serves to enclose the internal components such as the fly rod 2 and the resonant rod 4. This protects the internal components from external dust and debris, preventing contamination or damage. It also provides electromagnetic shielding to a certain extent, reducing interference between the electromagnetic signals inside the receiving cavity 111 and the external environment, thus ensuring the stable operation of the entire filter. Furthermore, since the cover plate 12 is detachably mounted on top of the housing 11, this arrangement allows for convenient assembly of the various components into the receiving cavity 111 during filter assembly. For example, after accurately assembling the internal components in their designated positions within the receiving cavity 111, the cover plate 12 is then installed on top of the housing 11, completing the overall assembly. Conversely, if the filter requires maintenance or component replacement, the cover plate 12 can be easily removed, exposing the components within the receiving cavity 111 for easy inspection, maintenance, or replacement by operators.

[0079] according to Figure 3 and Figure 4 As shown, specifically, it can be understood that a column 15 is provided inside the accommodating cavity 111, and a fourth screw hole 151 is opened at the top of the column 15; the cover plate 12 has a through hole 124 for communicating with the fourth screw hole 151; the filter also includes bolts, which are inserted into both the through hole 124 and the fourth screw hole 151. To improve the sealing performance of the entire filter and the convenience of disassembly and assembly, when assembling the cover plate 12, it is only necessary to connect the fourth screw hole 151 of the housing 11 with the through hole 124 of the cover plate 12, and then insert the bolts into both the through hole 124 and the fourth screw hole 151 to fix the cover plate 12 to the top of the housing 11. This arrangement improves the convenience of assembling the housing 11 and the cover plate 12 and provides a certain sealing effect for the accommodating cavity 111; conversely, when disassembling the cover plate 12, it is only necessary to remove the bolts from the fourth screw hole 151 and the through hole 124, and then the cover plate 12 can be removed.

[0080] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A filter, characterized by, The filter includes: The outer casing has an internal cavity, and a fixing hole is provided on the bottom surface of the cavity; a first screw hole is provided at the top of the outer casing. The flying rod is built into the accommodating cavity, and the flying rod has a coupling enhancement hole and a locking hole for corresponding communication with the fixing hole; A zero-point adjustment screw, wherein the zero-point adjustment screw is movably inserted through the first screw hole and one end of the screw is oriented toward the coupling enhancement hole; Multiple resonant rods, each of which has a through cavity, one of which is connected to the locking hole; A locking element, which is movably inserted through the through cavity and simultaneously inserted into the locking hole and the fixing hole.

2. The filter of claim 1, wherein, The cavity wall of the through cavity is provided with a first annular inclined surface; One end of the locking member is provided with a limiting block, and the outer side of the limiting block is provided with a second annular inclined surface for fitting with the first annular inclined surface.

3. The filter of claim 1, wherein, The locking member has threads on its outer side; the fixing hole is a threaded hole, and the locking member is inserted into the threaded hole by means of threads.

4. The filter according to any one of claims 1-3, characterized in that, The fly stick includes a first fly stick block, a second fly stick block, and a third fly stick block connected in sequence; the locking hole passes through the first fly stick block, and the coupling enhancement hole passes through the third fly stick block.

5. The filter according to claim 1, characterized in that, The top of the outer shell has multiple second screw holes; The filter also includes a plurality of frequency tuning screws, each of which is movably inserted through each of the second screw holes, and the same end of each of the frequency tuning screws is directed toward each of the through cavities.

6. The filter of claim 1, wherein, The top of the outer shell has multiple third screw holes; The filter also includes multiple coupling adjustment screws, each of which is movably inserted through each of the third screw holes.

7. The filter of claim 1, wherein, The bottom surface of the accommodating cavity is provided with a support portion; the fixing hole is provided in the support portion.

8. The filter of claim 1, wherein, The bottom of the outer casing is provided with multiple support bars at intervals.

9. The filter of claim 1, wherein, The outer casing includes a housing and a cover plate, the cover plate being detachably disposed on the top of the housing, and the accommodating cavity being located between the cover plate and the housing; The first screw hole extends through the cover plate.

10. The filter of claim 9, wherein, A column is provided inside the accommodating cavity, and a fourth screw hole is opened at the top of the column; the cover plate has a through hole for communicating with the fourth screw hole; The filter also includes a bolt, which passes through both the through hole and the fourth screw hole.

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