Adjustable capacitor and assembling method thereof

Abstract

The invention discloses an adjustable capacitor, which comprises an inner electrode and an outer electrode, the outer electrode is coaxially sleeved outside the inner electrode; the medium sleeve is arranged between the inner electrode and the outer electrode; one shaft end of the limiting piece extends into the outer electrode and is in contact with the outer electrode; one shaft end of the driving part extends into the limiting part and is connected with the outer electrode, the limiting part is matched with the driving part in an abutting mode to limit axial movement of the driving part, and when the driving part rotates in the circumferential direction, the outer electrode moves in the axial direction of the inner electrode so as to continuously change the overlapping area of the outer electrode and the inner electrode; the outer protection sleeve is arranged outside the outer electrode in a sleeving mode, and the two shaft ends of the outer protection sleeve are matched with the inner electrode and the limiting piece respectively so that the outer protection sleeve, the inner electrode and the limiting piece can be assembled into a whole. The invention further discloses an assembly method. According to the invention, real-time, continuous and accurate online tuning can be realized; the operation safety and convenience are greatly improved; the cost and the size are obviously reduced; and high reliability and stability in a high-pressure environment are ensured.

Description

Technical Field

[0001] This invention relates to the field of capacitor technology, and in particular to an adjustable capacitor and its assembly method. Background Technology

[0002] In radio communication, high-frequency medical equipment, and various high-voltage resonant circuits, capacitors with specific capacitance values ​​must be used to achieve precise frequency matching or coordination.

[0003] The existing capacitors with specific capacitance values ​​are achieved by connecting multiple fixed capacitors with different capacitance values ​​in parallel or series, but this also brings many drawbacks: (1) Each frequency adjustment means that the equipment must be stopped, powered off and physically operated, which is tedious, time-consuming and inefficient. For equipment that needs to frequently adjust the working frequency, such as experimental radios and medical equipment, this workflow seriously damages the operational efficiency and equipment practicality, and cannot meet the needs of real-time and dynamic tuning; (2) The tuning process depends on the operator's manual calculation, selection and connection, with low fault tolerance, and is prone to circuit failure due to incorrect capacitor selection or connection, or even damage to core components. This not only increases the skill requirements of the operator, but also introduces the risk of human error. In high-voltage tuning circuits, frequent physical plugging and unplugging and replacement of capacitor connections are not only inconvenient to operate, but also pose a very high risk of electric shock; (3) The arrangement of multiple high-voltage capacitors and their connections is not only costly and bulky, but also increases the possibility of parasitic parameters of the line and arc and short-circuit faults, affecting the reliability of the system; (4) Once the equipment is assembled, its frequency tuning range is limited by the preset fixed capacitor group. To meet new frequency requirements or optimize operating points, significant hardware modifications are often necessary, and the equipment lacks the flexibility to quickly adapt to different operating conditions in the field. In summary, tuning technology based on fixed capacitor banks is a discrete, passive, and inefficient solution, and it has become a major technical obstacle restricting the development of high-frequency electronic equipment, especially high-voltage, high-power equipment, towards greater convenience, intelligence, and efficiency. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an adjustable capacitor and its assembly method.

[0005] To achieve the above objectives, an embodiment of the present invention provides the following technical solution:

[0006] An adjustable capacitor includes:

[0007] Internal electrode;

[0008] The outer electrode is coaxially sleeved outside the inner electrode;

[0009] A dielectric sleeve is disposed between the inner electrode and the outer electrode;

[0010] A limiting member, one axial end of which extends into and contacts the outer electrode;

[0011] A driving member, one axial end of which extends into the limiting member and is connected to the outer electrode. The limiting member abuts against the driving member to restrict the axial movement of the driving member. When the driving member rotates circumferentially, the outer electrode moves along the axial direction of the inner electrode to continuously change the overlap area between the outer electrode and the inner electrode.

[0012] An outer protective sleeve is fitted over the outer electrode. The two axial ends of the outer protective sleeve are respectively engaged with the inner electrode and the limiting component so that the outer protective sleeve, the inner electrode and the limiting component are assembled into one unit.

[0013] As a further improvement of the present invention, the driving member includes a driving screw, the outer electrode includes a hollow outer electrode body and a protrusion disposed at an open end of the outer electrode body, and a shaft end of the driving screw is threadedly connected to the protrusion.

[0014] As a further improvement of the present invention, the limiting member includes a base plate and at least one side plate connected to one side of the base plate. The at least one side plate extends into the outer electrode body and fits against the inner side wall of the outer electrode body. One shaft end of the driving screw extends out of the protrusion and is provided with a stop member. The stop member abuts against the at least one side plate.

[0015] As a further improvement of the present invention, the stop member includes a cylindrical boss sleeved on the drive screw, an inner washer and an inner locking nut, the cylindrical boss is provided with a first annular step, the at least one side plate abuts against the first annular step, and the inner locking nut is fastened to the drive screw.

[0016] As a further improvement of the present invention, the limiting member further includes a connector connected to the other side of the substrate, the inner sidewall of the connector is provided with a first inclined surface, the outer sidewall of the drive screw is provided with a second inclined surface, and the first inclined surface abuts against the second inclined surface.

[0017] As a further improvement of the present invention, the protrusion is provided with at least one oil storage groove extending circumferentially, and the oil storage groove is connected to the interior of the protrusion.

[0018] As a further improvement of the present invention, the outer protective sleeve is provided with an inner electrode lead-out portion, one axial end of the outer protective sleeve is embedded in the inner electrode, the inner electrode lead-out portion is connected to the inner electrode, the limiting member is connected to the outer electrode lead-out portion, and the other axial end of the outer protective sleeve is embedded in the outer electrode lead-out portion and abuts against the limiting member.

[0019] As a further improvement of the present invention, one axial end of the dielectric sleeve abuts against the inner electrode, the other axial end of the dielectric sleeve extends into the outer electrode, and one axial end of the outer protective sleeve abuts against one axial end of the dielectric sleeve.

[0020] As a further improvement of the present invention, the inner electrode includes a cylindrical inner electrode body, a disk body connected to one axial end of the inner electrode body, and an annular flange connected to the edge of the disk body and extending axially. The dielectric sleeve includes a dielectric sleeve body, a second annular step and a third annular step protruding from the dielectric sleeve body. One axial end of the dielectric sleeve body abuts against the disk body. One axial end of the outer protective sleeve is embedded in the annular flange and abuts against the second annular step. The outer electrode is sleeved on the dielectric sleeve body and faces the third annular step.

[0021] A method for assembling an adjustable capacitor, comprising the following steps:

[0022] (1) Provide and preprocess the inner electrode, outer electrode, dielectric sleeve, limiting member, driving member and outer protective sleeve;

[0023] (2) Insert one end of the limiting member into the outer electrode and make it contact the outer electrode;

[0024] (3) Install the driving component into the limiting component;

[0025] (4) Connect the driving component to the external electrode;

[0026] (5) Assemble the outer protective sleeve onto the outer electrode, and simultaneously assemble the outer protective sleeve with the limiting member and the inner electrode respectively.

[0027] The beneficial effects of this invention are:

[0028] (1) Real-time, continuous and precise online tuning is achieved: This invention can steplessly and continuously change the capacitance value by moving the drive component, so that the equipment can adjust the operating frequency in real time without stopping or powering off, thereby greatly improving the operating efficiency and practicality of the equipment. This completely solves the fundamental problems of tuning lag and low operating efficiency in traditional methods, and is particularly suitable for medical equipment and radio systems that require frequent parameter optimization.

[0029] (2) It greatly improves operational safety and ease of use: the complex “calculation-selection-replacement-welding” process is simplified into a single mechanical action. This significantly reduces the professional skill requirements for operators and fundamentally eliminates the high-risk electric shock risk caused by plugging and unplugging capacitors on high voltage sites, thus ensuring the safety of personnel and equipment.

[0030] (3) Significantly reduced cost and size: The integrated design replaces the original set of fixed capacitors and complex switching with an adjustable capacitor, which greatly reduces the number of materials, reduces procurement and maintenance costs, reduces equipment space, and relieves the pressure of circuit layout, which strongly supports the development of electronic equipment towards miniaturization and high integration.

[0031] (4) Ensures high reliability and stability under high pressure: For high pressure applications, this invention includes a specially designed sealing structure and reasonable material selection, which ensures the long-term stable operation of the product under high pressure. The precision mechanical structure of the piston movement avoids problems such as poor contact, arc discharge and oxidation of connection points that may be caused by frequent manual connection in the traditional method, and the overall reliability of the system is qualitatively improved.

[0032] (5) It endows the equipment with excellent flexibility and adaptability: the wide range of continuously adjustable capacitance values ​​allows the same equipment to be quickly adapted to different operating frequencies, loads, etc. through simple adjustments. The equipment is freed from dependence on preset fixed capacitor combinations, and its on-site adaptability and functional expandability are significantly enhanced, greatly increasing its value over its service life. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is an exploded structural diagram of a preferred embodiment of the present invention;

[0035] Figure 2 for Figure 1 Enlarged diagram of A in the middle;

[0036] Figure 3 for Figure 1 Enlarged diagram of B in the middle;

[0037] Figure 4 This is a perspective view of a preferred embodiment of the present invention;

[0038] Figure 5 This is a cross-sectional view of a preferred embodiment of the present invention;

[0039] Figure 6 This is a front view of a preferred embodiment of the present invention;

[0040] Figure 7This is a side view of a preferred embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of a preferred embodiment of the present invention without an outer protective sleeve;

[0042] Figure 9 This is a partially enlarged view of the assembly of the drive screw and the connecting body according to a preferred embodiment of the present invention;

[0043] Figure 10 A partially enlarged view of the external electrode having an internal thread and an oil reservoir, according to a preferred embodiment of the present invention;

[0044] In the diagram: 1. Inner electrode; 11. Inner electrode body; 12. Disc body; 13. Annular flange; 2. Outer electrode; 21. Outer electrode body; 22. Protrusion; 220. Internal thread; 221. Oil reservoir; 3. Medium sleeve; 31. Medium sleeve body; 32. Second annular step; 33. Third annular step; 4. Limiting component; 41. Base plate; 411. Assembly groove; 42. Side plate; 43. Connector; 431. First inclined surface; 44. Outer gasket; 45. Outer locking mechanism. 5. Nut, 51. Drive component, 51. Drive screw, 511. Second inclined surface, 512. Annular groove, 513. Sealing ring, 6. Outer protective sleeve, 61. First stepped surface, 62. Second stepped surface, 63. Third stepped surface, 7. Stop component, 701. Cylindrical boss, 7011. First annular step, 702. Inner washer, 703. Inner locking nut, 71. Inner electrode lead-out part, 72. Outer electrode lead-out part, 81. Inner lead-out part pin, 82. Outer lead-out part pin. Detailed Implementation

[0045] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0046] Please see Figures 1-5 , Figure 8This application discloses an adjustable capacitor, including an inner electrode 1, an outer electrode 2, a dielectric sleeve 3, a limiting member 4, a driving member 5, and an outer protective sleeve 6. The outer electrode 2 is coaxially sleeved outside the inner electrode 1. The dielectric sleeve 3 is disposed between the inner electrode 1 and the outer electrode 2. The dielectric sleeve 3 is sleeved outside the inner electrode 1, and the outer electrode 2 is sleeved outside the dielectric sleeve 3. One axial end of the limiting member 4 extends into and contacts the outer electrode 2. One axial end of the driving member 5 extends into the limiting member 4 and is connected to the outer electrode 2. The limiting member 4 and the driving member 5 abut against each other to restrict the axial movement of the driving member 5. When the driving member 5 rotates circumferentially, the outer electrode 2 moves along the axial direction of the inner electrode 1 to continuously change the overlap area between the outer electrode 2 and the inner electrode 1. The outer protective sleeve 6 is sleeved outside the outer electrode 2. The two axial ends of the outer protective sleeve 6 respectively cooperate with the inner electrode 1 and the limiting member 4 to assemble the outer protective sleeve 6, the inner electrode 1, and the limiting member 4 into a single unit.

[0047] The inner electrode 1, outer electrode 2, dielectric sleeve 3, limiting component 4, driving component 5, and outer protective sleeve 6 are integrated together. By simply rotating the driving component 5, the overlap area between the outer electrode 2 and the inner electrode 1 can be linearly changed, achieving continuous and smooth adjustment of the capacitance value to obtain any desired capacitance value. Furthermore, the working stroke length of the outer electrode 2 matches the effective length of the inner electrode 1, enabling precise control of the capacitance value. The limiting component 4 and the driving component 5 abut against each other, preventing axial movement of both and ensuring the accuracy of the driving component 5 in converting rotational motion into linear axial movement of the outer electrode 2.

[0048] In this embodiment, the driving component 5 includes a driving screw 51, and the outer electrode 2 includes a hollow outer electrode body 21 and a protrusion 22 disposed at an open end of the outer electrode body 21. One shaft end of the driving screw 51 is threadedly connected to the protrusion 22. Preferably, the protrusion 22 is provided with an internal thread 220. Since the axial movement of the driving screw 51 is restricted, the driving screw 51 only performs circumferential rotational movement. When the driving screw 51 rotates, the protrusion 22 moves axially, thus causing the outer electrode 2 to move axially.

[0049] The limiting member 4 includes a base plate 41 and at least one side plate 42 connected to one side of the base plate 41. The at least one side plate 42 extends into the outer electrode body 21 and is in contact with the inner side wall of the outer electrode body 21. One shaft end of the drive screw 51 extends out of the protrusion 22 and is provided with a stop member 7, which abuts against the at least one side plate 42. By providing the stop member 7, the axial stop of the drive screw 51 and the limiting member 4 is achieved, which can prevent the axial movement of the drive screw 51 and the limiting member 4.

[0050] The preferred stop 7 includes a cylindrical boss 701 sleeved on the drive screw 51, an inner washer 702, and an inner locking nut 703. The cylindrical boss 701 is provided with a first annular step 7011, and at least one side plate 42 abuts against the first annular step 7011. The inner locking nut 703 is fastened to the drive screw 51. The inner locking nut 703 confines the cylindrical boss 701 to the drive screw 51, and the first annular step 7011 achieves stable contact between the drive screw 51 and the limiting member 4. To further improve the stable connection between the inner locking nut 703 and the drive screw 51, the inner locking nut 703 is preferably welded to the drive screw 51 to further ensure the locking of the axial travel of the drive screw 51 and prevent axial movement.

[0051] Please see Figure 9 In this embodiment, the limiting member 4 further includes a connector 43 connected to the other side of the substrate 41. The inner wall of the connector 43 is provided with a first inclined surface 431, and the outer wall of the drive screw 51 is provided with a second inclined surface 511. The first inclined surface 431 and the second inclined surface 511 abut against each other. To improve the stability of the limiting member 4, the substrate 41, at least one side plate 42, and the connector 43 are preferably integrally formed and connected. Preferably, the connector 43 is a threaded body with external threads, and the adjustable capacitor is fixed to the device by an external washer 44 and an external locking nut 45. To improve stability, it is preferred that there are two side plates 42. Preferably, the cross-section of the side plate 42 is arc-shaped, which facilitates its fit with the inner wall of the external electrode body 21.

[0052] Please see Figure 10 Preferably, the protrusion 22 is provided with at least one oil reservoir 221 extending circumferentially, and the oil reservoir 221 is connected to the interior of the protrusion 22. By providing the oil reservoir 221, the mechanical transmission between the drive screw 51 and the outer electrode 2 is ensured to be unobstructed. Preferably, there are two oil reservoirs 221, which are staggered along the axial direction. Preferably, the shape of the oil reservoir 221 is semi-circular, but it is not limited to semi-circular. It can also be square or other open structures, as long as it can store oil and allow oil to enter the interior of the protrusion 22.

[0053] In this embodiment, an annular groove 512 is provided on the outer wall of the drive screw 51, and a sealing ring 513 is provided at the annular groove 512. The sealing ring 513 is in close contact with the inner wall of the connecting body 43 of the limiting member 4. The sealing ring 513 ensures the sealing reliability of the outer electrode 2 in long-term reciprocating motion, and also reduces the lateral impact load that the drive screw 51 may be subjected to, ensuring that it does not deviate from the axis and has long-term stability in service environments such as high-frequency vibration.

[0054] Preferably, an inner electrode lead-out portion 71 is fitted onto an outer protective sleeve 6. One axial end of the outer protective sleeve 6 is embedded inside the inner electrode 1, and the inner electrode lead-out portion 71 is connected to the inner electrode 1. An outer electrode lead-out portion 72 is connected to a limiting member 4, and the other axial end of the outer protective sleeve 6 is embedded into the outer electrode lead-out portion 72 and abuts against the limiting member 4. The inner electrode lead-out portion 71 serves as the lead-out end of the inner electrode 1, and the outer electrode lead-out portion 72 serves as the lead-out end of the outer electrode 2, responsible for connecting the two electrodes and can be used for soldering leads, laser marking, etc. Both the inner electrode lead-out portion 71 and the outer electrode lead-out portion 72 are cylindrical. The other axial end of the outer protective sleeve 6 abuts against the substrate 41 of the limiting member 4. The inner electrode lead-out portion 71 and the outer electrode lead-out portion 72 are made of metal, with silver or tin plating to ensure solderability and conductivity. The inner electrode lead-out portion 71, the outer electrode lead-out portion 72, and the outer protective sleeve 6 can be connected by adhesive bonding or hot pressing. Flux was applied to the contact points between the inner electrode lead-out portion 71 and the inner electrode 1, and between the outer electrode lead-out portion 72 and the substrate 41 of the limiting member 4, and then soldered to complete the fixed assembly of the inner electrode lead-out portion 71 and the inner electrode 1, and the outer electrode lead-out portion 72 and the substrate 41.

[0055] To improve the stability of the assembly between the inner electrode lead-out portion 71, the outer electrode lead-out portion 72 and the outer protective sleeve 6, it is preferable that the outer peripheral wall of the outer protective sleeve 6 is provided with a first step surface 61, a second step surface 62 and a third step surface 63. The two axial ends of the inner electrode lead-out portion 71 abut against the first step surface 61 and the second step surface 62 respectively, one axial end of the outer electrode lead-out portion 72 is connected to the base plate 41 of the limiting member 4, and the other axial end of the outer electrode lead-out portion 72 abuts against the third step surface 63.

[0056] Preferably, a mounting groove 411 is provided on the substrate 41, and one axial end of the external electrode lead-out portion 72 is embedded in the mounting groove 411. It is understood that this method is not limited to this one, and one axial end of the external electrode lead-out portion 72 can also be bonded, welded or integrally formed to the substrate 41.

[0057] Preferably, one end of the dielectric sleeve 3 abuts against the inner electrode 1, and the other end of the dielectric sleeve 3 extends into the outer electrode 2. One end of the outer protective sleeve 6 abuts against one end of the dielectric sleeve 3. This improves the stability of the assembly of the dielectric sleeve 3, the inner electrode 1, and the outer protective sleeve 6.

[0058] Preferably, the inner electrode 1 includes a cylindrical inner electrode body 11, a disk body 12 connected to one axial end of the inner electrode body 11, and an annular flange 13 connected to the edge of the disk body 12 and extending axially. The dielectric sleeve 3 includes a dielectric sleeve body 31, a second annular step 32 and a third annular step 33 protruding from the dielectric sleeve body 31. One axial end of the dielectric sleeve body 31 abuts against the disk body 12. One axial end of the outer protective sleeve 6 is embedded in the annular flange 13 and abuts against the second annular step 32. The outer electrode 2 is sleeved outside the dielectric sleeve body 31 and faces the third annular step 33. Specifically, the outer electrode body 21 is sleeved outside the dielectric sleeve body 31 and the other open end of the outer electrode body 21 faces the third annular step 33. The third annular step 32 is provided to stop and limit the axial translation of the outer electrode 2, ensuring that the drive screw 51 can be stopped when it rotates to the maximum capacity, thus preventing slippage.

[0059] The dielectric sleeve 3, outer protective sleeve 6, and sealing ring 513 are all made of polymer resin material. Polymer resin material includes, but is not limited to, PVDF, PTFE, FEP, and other polymer resin materials. The inner electrode 1, outer electrode 2, limiting component 4, and driving component 5 are all made of metal or metal alloy material. The metal can be gold, silver, zinc, nickel, tin, etc., and the metal alloy can be a gold-silver composite, a silver-zinc composite, or a multilayer composite plating of the above metals.

[0060] Please see Figure 6 , Figure 7 The device also includes an inner lead-out pin 81 and an outer lead-out pin 82. The inner lead-out pin 81 is connected to the inner electrode lead-out portion 71, and the outer lead-out pin 82 is connected to the outer electrode lead-out portion 72. The inner lead-out pin 81 and the outer lead-out pin 82 can serve as the positive and negative terminals of an adjustable capacitor. After being soldered to the circuit board, it can be debugged and used. The inner lead-out pin 81 and the outer lead-out pin 82 include, but are not limited to, sheet metal, leads, etc. The inner lead-out pin 81 and the outer lead-out pin 82 can be made of materials such as copper, gold, silver, zinc, or alloys thereof. Preferably, the surfaces of the inner lead-out pin 81 and the outer lead-out pin 82 have a plating material, which can be a plating of materials such as nickel, tin, gold, silver, zinc, or a composite plating of the above metals.

[0061] When the adjustable capacitor of the present invention is in use, the rotating drive screw 51 drives the outer electrode 2 to move axially along the outer peripheral wall of the dielectric sleeve 3, thereby realizing the linear change of the overlapping area between the outer electrode 2 and the inner electrode 1. Then, by connecting the inner electrode lead-out part 71 and the outer electrode lead-out part 72, the capacitance value can be sensed to change continuously. As part of the circuit, the capacitor ultimately realizes the continuous and online tuning of the operating frequency of the device.

[0062] This application also discloses an assembly method for an adjustable capacitor, used to assemble the aforementioned adjustable capacitor, comprising the following steps:

[0063] (1) Provide and pre-process inner electrode 1, outer electrode 2, dielectric sleeve 3, limiting member 4, driving member 5 and outer protective sleeve 6;

[0064] (2) Insert one end of the limiting member 4 into the outer electrode 2 and make it contact the outer electrode 2;

[0065] (3) Install the driving component 5 into the limiting component 4;

[0066] (4) Connect the driving component 5 to the external electrode 2;

[0067] (5) Assemble the outer protective sleeve 6 to the outside of the outer electrode 2, and at the same time assemble the outer protective sleeve 6 with the limiting member 4 and the inner electrode 1 respectively.

[0068] To better illustrate the assembly method of the adjustable capacitor of the present invention, the following are detailed steps.

[0069] The first step is component preparation and pretreatment.

[0070] All parts are cleaned and dried, and then placed in a clean environment for later use.

[0071] The second step is the pre-assembly of the inner electrode lead-out part 71 and the outer protective sleeve 6.

[0072] First, the outer protective sleeve 6 is fully preheated, and then the inner electrode lead-out part 71 is pressed into the outer protective sleeve 6 for later use, forming the first pre-assembled component.

[0073] The third step is the assembly of the drive screw 51, the limiting member 4, and the external electrode 2.

[0074] First, insert the sealing ring 513 into the annular groove 512 of the drive screw 51, then insert the drive screw 51 into the limiting member 4, and finally screw the drive screw 51 into the protrusion 22 of the outer electrode 2. First, screw it to the maximum stroke so that the tail end of the drive screw 51 is exposed, thus forming a screw mechanism.

[0075] The fourth step is to weld and fix the stop 7 to the drive screw 51.

[0076] Place the screw mechanism obtained in the previous step in a special fixture, with one end of the drive screw 51 vertically upward. Then, sequentially insert the cylindrical boss 701 and the inner washer 702 into the drive screw 51, and screw in the inner locking nut 703 until it is tightened. Apply flux locally to the area of ​​the inner locking nut 703 to be welded, and use a soldering iron or a special welding machine to melt the solder onto the surface of the inner locking nut 703, forming a stable weld point. This achieves both mechanical and welding-based locking of the axial travel of the drive screw 51.

[0077] The fifth step is the welding of the external electrode lead-out part 72.

[0078] The external electrode lead-out portion 72 is fastened into the assembly groove 411 of the limiting member 4. After preheating in the fixture, the contact parts of the two are welded together to ensure the reliability of the electrical connection. At this point, the second pre-assembled assembly, including the external electrode 2, the inner locking nut 703, the inner washer 702, the cylindrical boss 701, the limiting member 4, the drive screw 51, the sealing ring 513, and the external electrode lead-out portion 72, is completed.

[0079] Step 6: Press-fitting and welding of inner electrode 1 with dielectric sleeve 3 and inner electrode lead-out part 71.

[0080] First, the dielectric sleeve 3 is press-fitted to the bottom of the inner electrode 1. Then, the first pre-assembled component obtained in the first step is press-fitted into the inner electrode 1, ensuring that the bottom of the outer protective sleeve 6 is tightly fitted with the second annular step 32 of the dielectric sleeve 3. This press-fitted body constitutes a third pre-assembled component including the inner electrode 1, the dielectric sleeve 3, the inner electrode lead-out part 71, and the outer protective sleeve 6. Subsequently, the third pre-assembled component is welded and secured at the joint between the inner electrode 1 and the inner electrode lead-out part 71 using a welding process. The inner electrode lead-out part 71, the outer electrode lead-out part 72, and the outer protective sleeve 6 can be connected by processes such as bonding, injection molding, or hot pressing.

[0081] Step 7: Final assembly and lubrication.

[0082] Apply a suitable amount of special lubricating oil to the oil reservoir 221 area inside the outer electrode 2, and then insert the second pre-assembled component axially into the third pre-assembled component to complete the assembly of the entire adjustable capacitor. This ultimately achieves the function of continuously adjusting the capacitance by rotating the drive screw 51 to move the outer electrode 2 axially.

[0083] Step 8: The inner electrode lead 81 and outer electrode lead 82 can be soldered to the inner electrode lead 71 and outer electrode lead 72 respectively using manual soldering, wave soldering, or other methods, to serve as the positive and negative electrode leads. The product can then be tested for various performance parameters or soldered and installed. Assembling the product according to the above process ensures that its basic performance and pressure resistance meet the usage requirements.

[0084] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0085] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An adjustable capacitor, characterized in that, include: Internal electrode; The outer electrode is coaxially sleeved outside the inner electrode; A dielectric sleeve is disposed between the inner electrode and the outer electrode; A limiting member, one axial end of which extends into and contacts the outer electrode; A driving member, one axial end of which extends into the limiting member and is connected to the outer electrode. The limiting member abuts against the driving member to restrict the axial movement of the driving member. When the driving member rotates circumferentially, the outer electrode moves along the axial direction of the inner electrode to continuously change the overlap area between the outer electrode and the inner electrode. An outer protective sleeve is fitted over the outer electrode. The two axial ends of the outer protective sleeve are respectively engaged with the inner electrode and the limiting component so that the outer protective sleeve, the inner electrode and the limiting component are assembled into one unit.

2. An adjustable capacitor according to claim 1, characterized in that, The driving component includes a driving screw, and the outer electrode includes a hollow outer electrode body and a protrusion disposed at an open end of the outer electrode body. One shaft end of the driving screw is threadedly connected to the protrusion.

3. An adjustable capacitor according to claim 2, characterized in that, The limiting member includes a base plate and at least one side plate connected to one side of the base plate. The at least one side plate extends into the outer electrode body and fits against the inner side wall of the outer electrode body. One shaft end of the drive screw extends out of the protrusion and is provided with a stop member. The stop member abuts against the at least one side plate.

4. An adjustable capacitor according to claim 3, characterized in that, The stop component includes a cylindrical boss, an inner washer, and an inner locking nut sleeved on the drive screw. The cylindrical boss is provided with a first annular step. At least one side plate abuts against the first annular step. The inner locking nut is fastened to the drive screw.

5. An adjustable capacitor according to claim 3, characterized in that, The limiting member also includes a connector connected to the other side of the substrate. The inner sidewall of the connector is provided with a first inclined surface, and the outer sidewall of the drive screw is provided with a second inclined surface. The first inclined surface abuts against the second inclined surface.

6. An adjustable capacitor according to claim 2, characterized in that, The protrusion is provided with at least one oil storage tank extending circumferentially, and the oil storage tank is connected to the interior of the protrusion.

7. An adjustable capacitor according to claim 1, characterized in that, The outer protective sleeve is fitted with an inner electrode lead-out portion. One axial end of the outer protective sleeve is embedded in the inner electrode. The inner electrode lead-out portion is connected to the inner electrode. The limiting member is connected to the outer electrode lead-out portion. The other axial end of the outer protective sleeve is embedded in the outer electrode lead-out portion and abuts against the limiting member.

8. An adjustable capacitor according to claim 1, characterized in that, One end of the dielectric sleeve abuts against the inner electrode, the other end of the dielectric sleeve extends into the outer electrode, and one end of the outer protective sleeve abuts against one end of the dielectric sleeve.

9. An adjustable capacitor according to claim 8, characterized in that, The inner electrode includes a cylindrical inner electrode body, a disk body connected to one axial end of the inner electrode body, and an annular flange connected to the edge of the disk body and extending axially. The dielectric sleeve includes a dielectric sleeve body, a second annular step and a third annular step protruding from the dielectric sleeve body. One axial end of the dielectric sleeve body abuts against the disk body. One axial end of the outer protective sleeve is embedded in the annular flange and abuts against the second annular step. The outer electrode is sleeved on the dielectric sleeve body and faces the third annular step.

10. A method for assembling an adjustable capacitor, characterized in that, For assembling the adjustable capacitor as described in any one of claims 1-9, the following steps are included: (1) Provide and preprocess the inner electrode, outer electrode, dielectric sleeve, limiting member, driving member and outer protective sleeve; (2) Insert one end of the limiting member into the outer electrode and make it contact the outer electrode; (3) Install the driving component into the limiting component; (4) Connect the driving component to the external electrode; (5) Assemble the outer protective sleeve onto the outer electrode, and simultaneously assemble the outer protective sleeve with the limiting member and the inner electrode respectively.

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