Connecting structure of variable capacitor

Abstract

The utility model discloses a connecting structure of a variable capacitor, which comprises a mounting bracket, a bearing and a joint, and is characterized in that the mounting bracket adopts an integrated structure and is used for being fixedly connected between a driving motor of the variable capacitor and an outer shell; the bearing is embedded in the mounting bracket and is used for bearing the screw rod of the variable capacitor; and the joint is arranged in the mounting bracket and is used for fixedly connecting the output shaft of the driving motor with the screw rod. The connecting structure of the variable capacitor is simple and reasonable, the coaxiality between the output shaft of the driving motor and the screw rod is effectively improved, and the capacitance value control precision of the capacitor is improved; the volume and the manufacturing cost of the capacitor and the impedance matcher are greatly reduced; and the user requirements are met.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a connection structure of a variable capacitor. Background Art

[0002] A vacuum capacitor is a capacitor with ceramic as the insulating shell, vacuum as the medium, and high-conductivity oxygen-free copper material as the electrode. Compared with other types of capacitors, vacuum capacitors have the advantages of high voltage resistance, large current carrying capacity, low high-frequency loss, and self-healing after instantaneous overload, which makes them particularly suitable for high-frequency and high-voltage applications. At present, vacuum capacitors are widely used in broadcast transmission, medical magnetic resonance imaging, high-frequency heating, semiconductor etching, plasma cleaning and other equipment. In these high-frequency devices, vacuum capacitors form a resonant circuit with high-frequency inductors to complete high-frequency impedance matching and achieve stable transmission of RF power.

[0003] Attached Figure 1 The structure of a conventional variable vacuum capacitor is shown, which drives a screw 4 to rotate by a driving motor 2 (specifically, a stepping motor or a servo motor), thereby driving a moving electrode 6 of the capacitor to move closer to or away from a stationary electrode 7 to adjust the capacitance. However, conventional variable vacuum capacitors have the following defects:

[0004] 1) The connection structure between the drive motor 2, the screw 4 and the outer shell 3 is complex and the installation accuracy is poor, which is specifically manifested in: Figure 1 As shown, the drive motor 2 is fixedly connected to the outer shell 3 by a combination of an upper mounting plate 50, a bracket 51 and a lower mounting plate 52, and the output shaft 20 of the drive motor 2 is fixedly connected to one end of the screw 4 by a combination of an upper joint 53, a connecting shaft 54 ​​and a lower joint 55. At the same time, the bearing 11 for receiving the screw 4 is fixedly built into the bracket 51 through a support sleeve 56. Due to the large number of connecting parts, the coaxiality between the output shaft 20 of the drive motor 2 and the screw 4 is poor, resulting in uneven force on the screw 4, and then causing unstable capacitance value changes. In addition, due to the large number of connecting parts, the overall volume of the capacitor product will increase, and the volume of the impedance matcher will also increase accordingly, thereby reducing the competitive advantage of the product. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the utility model provides a connection structure of a variable capacitor, which has a simple and reasonable structure, and can effectively improve the coaxiality between the output shaft of the drive motor and the screw, and improve the capacitance control accuracy of the capacitor; it can also greatly reduce the volume and manufacturing cost of the capacitor and the impedance matcher, and meet user needs.

[0006] The technical solution adopted by the utility model to solve the technical problem is: a connection structure of a variable capacitor, comprising:

[0007] A mounting bracket adopts an integrated structure and is used to be fixedly connected between the drive motor and the outer shell of the variable capacitor;

[0008] A bearing, which is embedded in the mounting bracket and is used to receive the screw of the variable capacitor;

[0009] A joint is built into the mounting bracket and is used to fix the output shaft of the driving motor to the screw rod.

[0010] As a further improvement of the present invention, the mounting bracket is provided with a main body portion which is a hollow structure and is fixedly connected between the driving motor and the outer shell, and a mounting ring groove which is integrally and coaxially provided on the inner wall of the main body portion;

[0011] The bearing is fixedly embedded in the mounting ring groove.

[0012] As a further improvement of the present invention, one end of the main body can be fixedly connected to the drive motor by any one of bolt connection, riveting and welding;

[0013] The other end of the main body can be fixedly connected to the outer shell by any one of bolt connection, threaded connection, clamping and welding.

[0014] As a further improvement of the utility model, the main body is in the shape of a hollow sleeve, one end of the main body is provided with a first threaded mounting hole for connecting to the drive motor, and the outer wall of the other end of the main body is provided with an external thread section for connecting to the outer shell.

[0015] As a further improvement of the present invention, the main body is in the shape of a hollow sleeve, one end of the main body is provided with a first threaded mounting hole for connecting to the drive motor, the other end of the main body is integrally provided with a mounting portion on the outer wall, and the mounting portion is provided with a second threaded mounting hole for connecting to the outer shell.

[0016] As a further improvement of the present invention, the mounting portion is in the shape of an annular plate and is arranged coaxially with the main body.

[0017] As a further improvement of the present invention, the joint adopts a hollow sleeve structure and is tightly matched with the output shaft of the driving motor and the screw rod respectively.

[0018] As a further improvement of the present invention, the connection structure is further provided with a pin for fixing the output shaft of the drive motor and the screw rod to the joint.

[0019] As a further improvement of the present invention, the main body also adopts a hollow sleeve structure and is arranged coaxially with the joint; the mounting ring groove is a step groove.

[0020] As a further improvement of the present invention, the connection structure is further provided with an observation window arranged on the main body, and the observation window passes through the main body.

[0021] The beneficial effects of the utility model are as follows: compared with the prior art, the utility model optimizes and innovates the connection structure between the drive motor and the outer shell and the screw in the variable capacitor, which not only effectively improves the coaxiality between the output shaft of the drive motor and the screw, thereby effectively improving the capacitance control accuracy of the capacitor; it also greatly reduces the volume and manufacturing cost of the capacitor and the impedance matcher; thereby well meeting user needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the cross-sectional structure of a conventional variable vacuum capacitor;

[0023] Figure 2 This is a schematic diagram of the structure of the variable capacitor shown in Example 1 of the utility model;

[0024] Figure 3 for Figure 2 A schematic cross-sectional structure diagram of the variable capacitor shown;

[0025] Figure 4 for Figure 3 An enlarged structural schematic diagram of the connection structure in the variable capacitor shown;

[0026] Figure 5 This is a schematic diagram of the structure of the variable capacitor shown in Example 2 of the utility model;

[0027] Figure 6 for Figure 5 A schematic cross-sectional structure diagram of the variable capacitor shown;

[0028] Figure 7 for Figure 6 An enlarged structural schematic diagram of the connection structure in the variable capacitor is shown.

[0029] Combined with the accompanying drawings, the following description is given:

[0030] 1. Connection structure; 10. Mounting bracket; 100. Main body; 101. Mounting ring groove; 102. First threaded mounting hole; 103. External thread section; 104. Mounting portion; 105. Second threaded mounting hole; 106. Annular boss; 11. Bearing; 12. Joint; 13. Latch; 14. Observation window; 2. Drive motor; 20. Output shaft; 3. Outer shell; 4. Screw; 50. Upper mounting plate; 51. Bracket; 52. Lower mounting plate; 53. Upper joint; 54. Connecting shaft; 55. Lower joint; 56. Support sleeve; 6. Moving electrode; 7. Static electrode. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] The utility model aims to optimize and innovate the connection structure between the drive motor 2 and the outer shell 3 and the screw 4 in the variable capacitor, so as to improve the coaxiality between the output shaft 20 of the drive motor 2 and the screw 4, improve the capacitance control accuracy of the capacitor, reduce the volume and manufacturing cost of the capacitor and the impedance matcher, thereby enhancing the competitive advantage of the product and meeting customer needs.

[0033] Embodiment 1:

[0034] Please see attached Figure 2 To Attachment Figure 4 As shown, this embodiment 1 provides a connection structure 1 of a variable capacitor, which includes a mounting bracket 10, a bearing 11 and a joint 12. The mounting bracket 10 adopts an integrated structure and is used to be fixedly connected between a drive motor 2 and an outer shell 3 of the variable capacitor; the bearing 11 is embedded in the mounting bracket 10 and is used to receive the screw 4 of the variable capacitor; the joint 12 is built into the mounting bracket 10 and is used to fix the output shaft 20 of the drive motor 2 to the screw 4.

[0035] As can be seen from the above, compared with the traditional variable vacuum capacitor, the number of parts of the connection structure of this embodiment is greatly reduced, especially the mounting bracket 10 is designed as an integrated structure, and the bearing 11 is directly embedded / integrated in the mounting bracket 10, which can effectively ensure the coaxiality control between the output shaft of the drive motor and the screw during product assembly, thereby effectively improving the capacitance control accuracy of the capacitor (the capacitance repeatability difference is less than 0.01%); moreover, since the number of parts of the connection structure is greatly reduced, the volume of the capacitor and the impedance matcher (the overall height of the capacitor is reduced by 20%) and the manufacturing cost are also greatly reduced, thereby meeting user needs well.

[0036] The specific structure of the connection structure of the variable capacitor described in this embodiment 1 is described in detail below.

[0037] First, regarding the mounting bracket 10 and the bearing 11;

[0038] In this embodiment 1, the preferred structure of the mounting bracket 10 is: Figure 2 To Attachment Figure 4As shown, the mounting bracket 10 is provided with a main body 100 of an integrated hollow structure, a mounting annular groove 101 integrally and coaxially provided on the inner wall of the main body 100, a first threaded mounting hole 102 provided at one end of the main body 100 for connection with the drive motor 2, and an external threaded section 103 provided on the outer wall of the other end of the main body 100 for connection with the outer shell 3. The main body 100 is also provided with an annular boss 106 extending horizontally inwardly along the radial direction of the main body 100, and the mounting annular groove 101 is provided on the annular boss 106 to receive the bearing 11. It can be understood that one end of the main body 100 is detachably fixedly connected to the drive motor 2 through the first threaded mounting hole 102 and the bolt combination thereon, and the other end of the main body 100 is threadedly connected to the outer shell 3 through the external thread segment 103 thereon. Of course, the outer shell 3 is provided with an internal thread segment that matches the external thread segment 103, which is common knowledge and will not be described in detail here.

[0039] From the above, it can be seen that in this embodiment 1, ① different from the existing "the drive motor 2 is fixedly connected to the outer shell 3 by a combination of an upper mounting plate 50, a bracket 51 and a lower mounting plate 52", this embodiment 1 directly fixes the drive motor 2 and the outer shell 3 through the main body 100, which greatly reduces the number of parts and components, and correspondingly, the influence of the cumulative tolerance of the parts is also reduced, thereby effectively improving the product assembly accuracy; ② the main body 100 and the drive motor 2 and the outer shell 3 are all detachably fixedly connected, which is not only convenient for assembly, but also convenient for adjusting the assembly status between the parts during assembly, thereby helping to improve the product assembly accuracy and assembly efficiency.

[0040] In addition, based on the above-mentioned mounting bracket 10 structure, the bearing 11 is fixedly embedded in the mounting ring groove 101, that is, the bearing 11 and the mounting bracket 10 are coaxially integrated together, which can effectively ensure the coaxiality control between the output shaft 20 of the driving motor and the screw during product assembly, thereby effectively improving the capacitance control accuracy of the capacitor.

[0041] Further preferably, the main body 100 adopts a hollow sleeve structure, and the specific shape of the sleeve can be a round sleeve or a square sleeve, etc., and the utility model patent does not impose any restrictions. The mounting ring groove 101 is a step groove to facilitate the installation of the bearing 11.

[0042] In addition, an observation window 14 is provided on the main body 100, and the observation window 14 runs through the main body 100. The observation window 14 can be configured as a plurality of windows arranged at intervals on the main body 100, and can be set to an elliptical, circular or square shape, etc., so as to facilitate observation of the interior of the mounting bracket 10 during installation and to perform locking operations on the drive motor 2, the screw 4 and the joint 12.

[0043] Next, regarding the joint 12;

[0044] In the present embodiment 1, the joint 12 also adopts a hollow sleeve structure, and is respectively tightly matched with the output shaft 20 of the drive motor 2 and the screw rod 4. Note: The "tight fit" here can be understood as "slightly tight fit", which is convenient for sleeve-mounting the joint 12 on the output shaft 20 of the drive motor 2 and the screw rod 4, and allows the joint 12 to constrain the output shaft 20 of the drive motor 2 and the screw rod 4, so as to avoid the disadvantage of the three being configured in different axes due to the excessive gap between the joint 12 and the output shaft 20 of the drive motor 2 and the screw rod 4.

[0045] In addition, based on the installation layout of the connector 12 , the connector 12 is arranged coaxially with the main body 100 .

[0046] In addition, in order to enhance the connection strength between the joint 12 and the output shaft 20 of the drive motor 2 and the screw 4, a plurality of latches 13 are further provided in the connection structure of this embodiment to fix the output shaft 20 of the drive motor 2 and the screw 4 to the joint 12.

[0047] Finally, regarding the material selection of the mounting bracket 10 and the connector 12, this embodiment preferably uses insulating materials to prevent high frequency and high voltage from affecting the drive motor, etc. Of course, according to product design requirements, the mounting bracket 10 and the connector 12 can also be made of conductive metal materials.

[0048] Embodiment 2:

[0049] The second embodiment also provides a connection structure 1 of a variable capacitor, and compared with the first embodiment, the main difference of the second embodiment is that the connection method between the main body 100 and the driving motor 2 and the outer shell 3 is different from that of the first embodiment.

[0050] Specifically, the structure of the main body 100 connected to the driving motor 2 and the outer shell 3 in this embodiment 2 is as follows: Figure 5 To Attachment Figure 7As shown, the main body 100 is in the shape of a hollow sleeve, and one end of the main body 100 is provided with a first threaded mounting hole 102 for connecting with the drive motor 2, and the other end of the main body 100 is provided with a mounting portion 104 on the outer wall, and the mounting portion 104 is provided with a second threaded mounting hole 105 for connecting with the outer shell 3. It can be understood that one end of the main body 100 is detachably fixedly connected with the drive motor 2 through the first threaded mounting hole 102 and the bolt combination thereon, and the other end of the main body 100 is detachably fixedly connected with the outer shell 3 through the second threaded mounting hole 105 and the bolt combination. That is, in this embodiment 2, the mounting bracket 10 and the drive motor 2 and the outer shell 3 are also detachably fixedly connected, which is conducive to improving the assembly accuracy and assembly efficiency of the product.

[0051] Further preferably, the mounting portion 104 is in the shape of an annular plate extending horizontally outward in the radial direction of the main body 100 , and is coaxially arranged with the main body 100 .

[0052] In addition to the above-mentioned differences, the structure and / or installation method of the bearing 11 and the joint 12 in the connection structure 1 described in this embodiment 2 can adopt the same technical solutions as those in embodiment 1, so they will not be described here in detail.

[0053] Supplementary explanation: Regarding the "connection method between the main body 100 and the drive motor 2 and the outer shell 3", in addition to the methods shown in the above embodiments 1 and 2, the following methods can also be adopted: ① one end of the main body 100 is fixedly connected to the drive motor 2 by riveting, and the other end of the main body 100 is fixedly connected to the outer shell 3 by bolting or clamping; or, ② the two ends of the main body 100 are fixedly connected to the drive motor 2 and the outer shell 3 by welding respectively; etc.; it is determined according to the specific product design requirements.

[0054] To sum up, the connection structure of the variable capacitor described in the utility model is simple and reasonable, which not only effectively improves the coaxiality between the output shaft of the driving motor and the screw, and improves the capacitance control accuracy of the capacitor; it also greatly reduces the volume and manufacturing cost of the capacitor and the impedance matcher, and meets user needs.

[0055] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A connection structure of a variable capacitor, characterized in that: include: A mounting bracket (10) which adopts an integrated structure and is used for fixedly connecting between a driving motor (2) and an outer shell (3) of the variable capacitor; A bearing (11) is embedded in the mounting bracket (10) and is used to receive the screw (4) of the variable capacitor; A joint (12) is built into the mounting bracket (10) and is used to fixedly connect the output shaft of the drive motor (2) and the screw rod (4).

2. The variable capacitor connection structure according to claim 1, wherein: The mounting bracket (10) is provided with a main body (100) having a hollow structure and being fixedly connected between the driving motor (2) and the outer shell (3), and a mounting ring groove (101) integrally and coaxially provided on the inner wall of the main body (100); The bearing (11) is fixedly embedded in the mounting ring groove (101).

3. The connection structure of the variable capacitor according to claim 2, characterized in that: One end of the main body (100) can be fixedly connected to the drive motor (2) by any one of bolt connection, riveting and welding; The other end of the main body (100) can be fixedly connected to the outer shell (3) by any one of bolt connection, thread connection, clamping and welding.

4. The variable capacitor connection structure according to claim 3, characterized in that: The main body (100) is in the shape of a hollow sleeve, one end of the main body (100) is provided with a first threaded mounting hole (102) for connecting to the drive motor (2), and the other end of the main body (100) is provided with an external threaded section (103) on the outer wall for connecting to the outer shell (3).

5. The variable capacitor connection structure according to claim 3, characterized in that: The main body (100) is in the shape of a hollow sleeve, and one end of the main body (100) is provided with a first threaded mounting hole (102) for connecting to the drive motor (2), and the other end of the main body (100) is provided with a mounting portion (104) protruding from the outer wall, and the mounting portion (104) is provided with a second threaded mounting hole (105) for connecting to the outer shell (3).

6. The connection structure of the variable capacitor according to claim 5, characterized in that: The mounting portion (104) is in the shape of an annular plate and is arranged coaxially with the main body (100).

7. The variable capacitor connection structure according to claim 2, characterized in that: The joint (12) adopts a hollow sleeve structure and is tightly matched with the output shaft of the drive motor (2) and the screw rod (4) respectively.

8. The variable capacitor connection structure according to claim 7, characterized in that: The connection structure is also provided with a latch (13) for fixing the output shaft of the drive motor (2) and the screw rod (4) to the joint (12).

9. The variable capacitor connection structure according to claim 7, characterized in that: The main body (100) also adopts a hollow sleeve structure and is coaxially arranged with the joint (12); the mounting ring groove (101) is a step groove.

10. The variable capacitor connection structure according to claim 2, characterized in that: The connection structure is also provided with an observation window (14) arranged on the main body (100), and the observation window (14) passes through the main body (100).

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