Variable vacuum capacitor

Abstract

This utility model belongs to the field of capacitor technology and discloses a variable vacuum capacitor. The variable vacuum capacitor includes a stationary phase group, a moving phase group, a positioning nut, a rotating screw, a support sleeve, an adapter, and a first limiting member. The moving phase group is arranged opposite to the stationary phase group, and the moving phase group can change its relative distance to the stationary phase group to adjust the capacitance value. The positioning nut is drivenly connected to the moving phase group. The rotating screw is threadedly connected to the positioning nut. The rotating screw passes through the support sleeve. The adapter is connected to the end of the rotating screw away from the moving phase group, and the adapter abuts against the end of the support sleeve away from the moving phase group. The first limiting member is located at one end of the rotating screw. When the positioning nut moves the moving phase group closer to the stationary phase group, the positioning nut abuts against the first limiting member to prevent the rotating screw from disengaging from the threaded connection with the positioning nut. This utility model can prevent the rotating screw from disengaging from the positioning nut, avoid damage to the variable vacuum capacitor, and ensure safety.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, and in particular to a variable vacuum capacitor. Background Technology

[0002] A vacuum capacitor is a type of capacitor with a ceramic insulating shell and high-conductivity oxygen-free copper electrodes, used in a vacuum environment. Compared to other capacitors, it has advantages such as high voltage withstand capability, large current carrying capacity, low high-frequency loss, and self-healing ability after transient overload, making it particularly suitable for high-frequency, high-voltage applications. Vacuum capacitors are widely used in equipment such as broadcasting, medical MRI, high-frequency heating, semiconductor etching, and plasma cleaning. In these high-frequency devices, vacuum capacitors form resonant circuits with high-frequency inductors to achieve high-frequency impedance matching and realize stable transmission of radio frequency power.

[0003] A variable vacuum capacitor mainly consists of two sets of electrodes sealed in a vacuum. The capacitance value can be changed and adjusted by rotating a screw to change the coupling length of the two sets of electrodes.

[0004] In existing variable vacuum capacitors, when the user rotates the screw beyond its stroke, the screw may detach from the capacitor body, damaging the capacitor and causing a sudden change in capacitance, seriously affecting its safety. Utility Model Content

[0005] The purpose of this invention is to provide a variable vacuum capacitor that solves the problem of damage to the variable vacuum capacitor caused by the rotating screw disengaging from it; at the same time, it avoids sudden changes in the capacitance value of the variable vacuum capacitor, thus ensuring the safety and stability of the variable vacuum capacitor.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A variable vacuum capacitor, comprising:

[0008] Shizuko Group;

[0009] A moving element group is arranged opposite to the stationary element group, and the moving element group can change its relative distance to the stationary element group to adjust the capacitance value;

[0010] The positioning nut is connected to the moving part assembly for transmission.

[0011] Rotate the screw to engage with the positioning nut via thread;

[0012] A support sleeve, through which the rotating screw passes;

[0013] An adapter is connected to the end of the rotating screw away from the moving part assembly, and the adapter abuts against the end of the support sleeve away from the moving part assembly;

[0014] A first limiting member is provided at one end of the rotating screw. When the positioning nut drives the moving part group to approach the stationary part group, the positioning nut can abut against the first limiting member to prevent the rotating screw from disengaging from the threaded connection with the positioning nut.

[0015] As an alternative to a variable vacuum capacitor, one end of the rotating screw is provided with a first through hole, the first limiting member passes through the first through hole, and at least a portion of the structure on the first limiting member is exposed in the first through hole and abuts against the positioning nut.

[0016] As an alternative to a variable vacuum capacitor, the first limiting element is a pin.

[0017] As an alternative to a variable vacuum capacitor, one end of the rotating screw is provided with an annular groove along the circumference. The first limiting member is an annular member, with a portion of the structure of the first limiting member placed in the annular groove and another portion of the structure protruding from the annular groove and abutting against the positioning nut.

[0018] As an alternative to a variable vacuum capacitor, the first limiting member is a retaining ring.

[0019] As an alternative to a variable vacuum capacitor, the first limiting member is screwed to one end of the rotating screw.

[0020] As an alternative to a variable vacuum capacitor, the first limiting member is reinforced with the rotating screw by adhesive bonding or welding.

[0021] As an alternative to the variable vacuum capacitor, the variable vacuum capacitor further includes a second limiting member, with one end of the rotating screw away from the mover assembly placed inside the adapter. The second limiting member passes through the adapter and the rotating screw in sequence, so that the adapter drives the rotating screw to rotate.

[0022] As an alternative to a variable vacuum capacitor, the support sleeve is provided with a positioning groove, a bearing is provided in the positioning groove, the bearing is sleeved on the rotating screw, and the adapter abuts against the end of the bearing.

[0023] As an alternative to a variable vacuum capacitor, the end of the rotating screw away from the mover assembly is screwed to the adapter, and the adapter is provided with an abutment portion that can abut against the end of the support sleeve away from the mover assembly.

[0024] Beneficial effects:

[0025] In this invention, by providing a first limiting member at one end of the rotating screw, when the positioning nut drives the moving part assembly closer to the stationary part assembly, the positioning nut abuts against the first limiting member, thus preventing the rotating screw from disengaging from the positioning nut and maintaining a threaded connection. The variable vacuum capacitor provided by this application effectively prevents the rotating screw from disengaging from the variable vacuum capacitor, avoiding damage to the capacitor; it also avoids sudden changes in capacitance caused by the rotating screw disengaging from the positioning nut, ensuring the safety and stability of the variable vacuum capacitor. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of a variable vacuum capacitor provided by existing technology;

[0027] Figure 2 This is a cross-sectional view of a variable vacuum capacitor provided in Embodiment 1 of this utility model;

[0028] Figure 3 This is an exploded view of a variable vacuum capacitor provided in Embodiment 1 of this utility model;

[0029] Figure 4 This is a cross-sectional view of a variable vacuum capacitor provided in Embodiment 2 of this utility model;

[0030] Figure 5 This is a cross-sectional view of a variable vacuum capacitor provided in Embodiment 3 of this utility model;

[0031] Figure 6 This is a cross-sectional view of a variable vacuum capacitor provided in Embodiment 4 of this utility model.

[0032] In the picture:

[0033] 100. Existing stator assembly; 200. Existing mover assembly; 300. Existing locating nut; 400. Existing rotating screw; 500. Existing support sleeve; 600. Existing tie rod;

[0034] 1. Stator assembly; 2. Moving assembly; 3. Locating nut; 4. Rotating screw; 41. First through hole; 5. Support sleeve; 51. Bearing; 6. Adapter; 61. Abutment part; 7. First limiting member; 8. Second limiting member; 9. Stator plate; 10. Moving plate; 11. Bellows; 12. Ceramic tube sleeve; 13. Base; 14. Tie rod; 15. Guide sleeve. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] Please see the appendix Figure 1The existing variable vacuum capacitor includes an existing stator assembly 100, an existing mover assembly 200, an existing positioning nut 300, an existing rotating screw 400, an existing support sleeve 500, and an existing pull rod 600. Specifically, the existing rotating screw 400 is threadedly connected to the existing positioning nut 300. An external drive unit drives the existing rotating screw 400 to rotate, causing the existing positioning nut 300 to move along the axial direction of the existing rotating screw 400. This causes the existing positioning nut 300 to move the existing mover assembly 200, thereby changing the coupling length between it and the existing stator assembly 100, and thus changing the coupling area between the electrodes. This results in a change in capacitance, achieving the capacitance adjustment function of the existing variable vacuum capacitor.

[0040] Specifically, firstly, rotating the existing rotating screw 400 clockwise decreases the capacitance of the existing variable vacuum capacitor. The existing positioning nut 300 moves upwards. When the upper surface of the existing positioning nut 300 abuts against the existing support sleeve 500, its movement is blocked, and the capacitance no longer decreases. If the existing rotating screw 400 continues to rotate clockwise, the resistance of the existing support sleeve 500 to the existing positioning nut 300 increases, and the existing rotating screw 400 tends to continuously enter the existing support sleeve 500. However, due to the obstruction by the end boss of the existing rotating screw 400, it cannot continue to rotate clockwise. When the existing rotating screw 400 rotates counterclockwise, the capacitance of the existing variable vacuum capacitor increases. When the existing rotating screw 400 rotates counterclockwise, the existing positioning nut 300 moves downward. After the lower end face of the existing positioning nut 300 moves and abuts against the lower limiting structure, the existing positioning nut 300 is blocked. At this point, the capacitance value no longer increases, reaching the maximum capacitance position. However, if the existing rotating screw 400 continues to rotate counterclockwise (e.g., due to a drive malfunction), the existing rotating screw 400 will move upward axially. When the upward movement distance of the existing rotating screw 400 exceeds the engagement length between the existing rotating screw 400 and the existing positioning nut 300, the existing rotating screw 400 will disengage from the threaded hole of the existing positioning nut 300. In this case, if the existing variable vacuum capacitor is installed horizontally or in reverse, the existing support sleeve 500 and other components relying on the existing support sleeve 500 will fall off due to lack of fixation, thereby damaging the existing variable vacuum capacitor; at the same time, the capacitance value of the capacitor will also change abruptly, seriously affecting safety and stability.

[0041] Example 1

[0042] To address the above issues, this application provides a variable vacuum capacitor, please refer to the appendix. Figure 2 and attached Figure 3The variable vacuum capacitor includes a stationary assembly 1, a moving assembly 2, a positioning nut 3, a rotating screw 4, a support sleeve 5, an adapter 6, and a first limiting member 7. The moving assembly 2 is positioned opposite the stationary assembly 1, and its relative distance to the stationary assembly 1 can be changed to adjust the capacitance. The positioning nut 3 is connected to the moving assembly 2. The rotating screw 4 is screwed to the positioning nut 3. The rotating screw 4 passes through the support sleeve 5. The adapter 6 is connected to the end of the rotating screw 4 away from the moving assembly 2, and the adapter 6 abuts against the end of the support sleeve 5 away from the moving assembly 2. The first limiting member 7 is located at one end of the rotating screw 4. When the positioning nut 3 moves the moving assembly 2 closer to the stationary assembly 1, the positioning nut 3 abuts against the first limiting member 7 to prevent the rotating screw 4 from disengaging from the threaded connection with the positioning nut 3.

[0043] Specifically, the stator assembly 1 is mounted on the stator plate 9, which is connected to the sleeve-shaped ceramic tube sleeve 12. The moving plate 10 is placed inside the ceramic tube sleeve 12 and is used to support and connect the moving assembly 2. One end of the pull rod 14 is connected to the moving plate 10, and the other end of the pull rod 14 is connected to the positioning nut 3. The positioning nut 3 is provided with a connecting boss, which can be connected to the other end of the pull rod 14 by interference fit or threaded connection. A guide sleeve 15 is also provided outside the pull rod 14, and the pull rod 14 slides inside the guide sleeve 15. The guide sleeve 15 is used to provide stable support and guidance for the movement of the pull rod 14, ensuring the accuracy of the position movement of the pull rod 14. On the other side of the ceramic tube sleeve 12, there is also a base 13. The guide sleeve 15 is at least partially fixed inside the base 13. The base 13 is used to provide positioning and support. A bellows 11 is also wrapped around the outside of the pull rod 14. The bellows 11 is used to improve the dustproofness of the pull rod 14, prevent dust or moisture from entering the interior and affecting the reliability of the sliding connection, and improve the service life.

[0044] Furthermore, the rotating screw 4 and the positioning nut 3 are threadedly engaged. An external drive component can be a motor, with the motor's drive end connected to the end of the rotating screw 4. The two can be connected by a key or a tight fit for transmission, with the motor driving the rotating screw 4 to rotate. When the rotating screw 4 rotates, it moves the positioning nut 3 along its axis, causing the positioning nut 3 to move the moving element group 2, changing the coupling length between it and the stationary element group 1. This changes the coupling area between the electrodes, thus altering the capacitance value and adjusting the capacitance of the vacuum capacitor. As the motor drives the rotating screw 4 to rotate counterclockwise, the moving element group 2 gradually approaches the stationary element group 1, thereby increasing the capacitance of the variable vacuum capacitor. When the rotating screw 4 rotates counterclockwise, the positioning nut 3 continues to move downward. When the lower end face of the positioning nut 3 moves to abut against the end face of the guide sleeve 15, the positioning nut 3 is in the lowest position. At this time, the capacitance of the variable vacuum capacitor is at its maximum. If the motor does not stop working at this time, and the number of rotations of the motor exceeds the specified number of rotations, the motor can continue to drive the rotating screw 4 to rotate counterclockwise. The rotating screw 4 has a tendency to move upward and disengage from the positioning nut 3. In this embodiment, by setting a first limiting member 7 at one end of the rotating screw 4, when the positioning nut 3 drives the moving part group 2 to approach the stationary part group 1, the positioning nut 3 can abut against the first limiting member 7, so that the rotating screw 4 cannot disengage from the positioning nut 3 and always maintains the threaded connection state.

[0045] The variable vacuum capacitor provided by this application can effectively prevent the rotating screw 4 from detaching from the variable vacuum capacitor, thus solving the problem in the prior art where the existing support sleeve 500 and other components relying on the existing support sleeve 500 cannot be fixed and thus cause damage to the existing variable vacuum capacitor; at the same time, it can also avoid the problem of sudden change in the capacitance of the variable vacuum capacitor caused by the rotating screw 4 detaching from the positioning nut 3, ensuring the safety and stability of the variable vacuum capacitor.

[0046] It should be noted that, since the prior art does not involve the first limiting member 7, during assembly, the existing rotating screw 400 can be screwed to the existing pull rod 600 first, then the existing rotating screw 400 can be inserted into the existing support sleeve 500, and then the existing rotating screw 400 can be screwed to the existing positioning nut 300. In this application, because the first limiting member 7 is designed, the first limiting member 7 needs to be fixed on the rotating screw 4 before assembly is completed. However, due to the obstruction of the first limiting member 7, the rotating screw 4 cannot complete the screwing with the positioning nut 3 after passing through the support sleeve 5. Therefore, the adapter 6 is set to ensure the smooth implementation of the assembly.

[0047] Specifically, please refer to the appendix. Figure 3 The assembly process of the variable vacuum capacitor is as follows.

[0048] First, the electrode assembly and internal parts are welded and vacuumed to form the base. Then, the rotating screw 4 is screwed into the positioning nut 3, and the first limiting member 7 is installed and its position is fixed to the rotating screw 4. Next, the positioning nut 3 is screwed into the internal threaded hole of the pull rod 14. Finally, the rotating screw 4 is made to pass through the support sleeve 5 and connect to the adapter 6. The adapter 6 prevents the rotating screw 4 from moving axially when it is rotated.

[0049] Optionally, one end of the rotating screw 4 is provided with a first through hole 41, the first limiting member 7 passes through the first through hole 41, and at least part of the structure of the first limiting member 7 is exposed in the first through hole 41 and abuts against the positioning nut 3.

[0050] In this embodiment, the first limiting member 7 can be a pin. A through hole is provided at one end of the rotating screw 4, and the pin passes through the through hole. The length of the pin is greater than the length of the through hole, so that both ends of the pin can protrude from the first through hole 41 and abut against the positioning nut 3. The pin can be interference-fitted with the through hole, or it can be clearance-fitted, and then reinforced by high-temperature adhesive or partial welding.

[0051] In this embodiment, the use of a pivot pin structure is simple and can reliably prevent the rotating screw 4 from disengaging from the positioning nut 3.

[0052] Optionally, the variable vacuum capacitor also includes a second limiting member 8, with one end of the rotating screw 4 away from the mover assembly 2 placed inside the adapter 6. The second limiting member 8 passes through the adapter 6 and the rotating screw 4 in sequence, so that the adapter 6 drives the rotating screw 4 to rotate.

[0053] Specifically, the second limiting member 8 is also a pin. The end of the rotating screw 4 away from the mover assembly 2 is inserted into the adapter 6. The pin then passes through the adapter 6 and the rotating screw 4 in sequence, and is reinforced by high-temperature glue or local welding. The second limiting member 8 enables the adapter 6 to drive the rotating screw 4 to rotate. At the same time, the adapter 6 is provided with an abutment part 61, which abuts against the support sleeve 5 to prevent the rotating screw 4 from moving axially.

[0054] Optionally, the support sleeve 5 is provided with a positioning groove, and a bearing 51 is provided in the positioning groove. The bearing 51 is sleeved on the rotating screw 4, and the adapter 6 abuts against the end of the bearing 51.

[0055] In this embodiment, a circular positioning groove is provided at the end of the support sleeve 5, and the bearing 51 is placed in the positioning groove. The positioning groove is used to limit the bearing 51, and the bearing 51 is used to support the rotating screw 4. At the same time, the abutment part 61 can abut against the end face of the bearing 51.

[0056] Example 2

[0057] Please see the appendix Figure 4 This embodiment is basically the same as the first embodiment, except that one end of the rotating screw 4 is provided with an annular groove along the circumference, the first limiting member 7 is an annular member, a part of the structure of the first limiting member 7 is placed in the annular groove, and the other part of the structure protrudes out of the annular groove and abuts against the positioning nut 3.

[0058] Specifically, the first limiting member 7 can be a retaining ring, which is locked in the annular groove and abuts against the positioning nut 3. In this embodiment, the structure of the retaining ring is simple and can reliably prevent the rotating screw 4 from disengaging from the positioning nut 3.

[0059] Furthermore, the connection between the retaining ring and the rotating screw 4 can also be reinforced by high-temperature adhesive bonding or partial welding.

[0060] Example 3

[0061] Please see the appendix Figure 5 This embodiment is basically the same as the above embodiment, except that the first limiting member 7 is screwed to one end of the rotating screw 4.

[0062] Specifically, the first limiting member 7 can be a limiting nut, with an external thread machined at one end of the rotating screw 4 to engage with the internal thread of the limiting nut. After the two are connected, the limiting nut can abut against the positioning nut 3. In this embodiment, the structure using a limiting nut is simple and can reliably prevent the rotating screw 4 from disengaging from the positioning nut 3.

[0063] Furthermore, the connection between the existing nut and the rotating screw 4 can also be reinforced by high-temperature adhesive bonding or partial welding.

[0064] Example 4

[0065] Please see the appendix Figure 6 In this embodiment, the end of the rotating screw 4 away from the moving part group 2 is screwed to the adapter 6. The adapter 6 is provided with an abutment part 61, which can abut against the end of the support sleeve 5 away from the moving part group 2.

[0066] In this embodiment, by machining an external thread at the other end of the rotating screw 4 and threading it into the internal thread of the adapter 6, effective transmission can be ensured while reducing the number of parts and lowering costs. The abutting part 61 has a limiting platform protruding outward along the outer wall of the adapter 6, which abuts against the support sleeve 5 or the bearing 51 to prevent the rotating screw 4 from moving axially.

[0067] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A variable vacuum capacitor, characterized in that, include: Jingzi group (1); The moving part (2) is arranged opposite to the stationary part (1), and the moving part (2) can change its relative distance to the stationary part (1) to adjust the capacitance value; The positioning nut (3) is connected to the moving part assembly (2) for transmission. Rotate the screw (4) to engage with the positioning nut (3) threaded connection; The support sleeve (5) is through which the rotating screw (4) passes; The adapter (6) is connected to the end of the rotating screw (4) away from the moving part (2), and the adapter (6) abuts against the end of the support sleeve (5) away from the moving part (2); The first limiting member (7) is provided at one end of the rotating screw (4). When the positioning nut (3) drives the moving part (2) to approach the stationary part (1), the positioning nut (3) can abut against the first limiting member (7) to restrict the rotating screw (4) from disengaging from the threaded connection with the positioning nut (3).

2. The variable vacuum capacitor according to claim 1, characterized in that, One end of the rotating screw (4) is provided with a first through hole (41), the first limiting member (7) passes through the first through hole (41), and at least part of the structure of the first limiting member (7) is exposed in the first through hole (41) and abuts against the positioning nut (3).

3. The variable vacuum capacitor according to claim 2, characterized in that, The first limiting component (7) is a pivot pin.

4. The variable vacuum capacitor according to claim 1, characterized in that, One end of the rotating screw (4) is provided with an annular groove along the circumference. The first limiting member (7) is an annular member. A part of the structure of the first limiting member (7) is placed in the annular groove, and another part of the structure protrudes from the annular groove and abuts against the positioning nut (3).

5. The variable vacuum capacitor according to claim 4, characterized in that, The first limiting member (7) is a retaining ring.

6. The variable vacuum capacitor according to claim 1, characterized in that, The first limiting member (7) is screwed to one end of the rotating screw (4).

7. The variable vacuum capacitor according to any one of claims 2-6, characterized in that, The first limiting member (7) and the rotating screw (4) are reinforced by adhesive bonding or welding.

8. The variable vacuum capacitor according to claim 1, characterized in that, The variable vacuum capacitor also includes a second limiting member (8). One end of the rotating screw (4) away from the mover assembly (2) is placed inside the adapter (6). The second limiting member (8) passes through the adapter (6) and the rotating screw (4) in sequence, so that the adapter (6) drives the rotating screw (4) to rotate.

9. The variable vacuum capacitor according to claim 1, characterized in that, The support sleeve (5) is provided with a positioning groove, and a bearing (51) is provided in the positioning groove. The bearing (51) is sleeved on the rotating screw (4), and the adapter (6) abuts against the end of the bearing (51).

10. The variable vacuum capacitor according to claim 1, characterized in that, The end of the rotating screw (4) away from the moving part assembly (2) is screwed to the adapter (6). The adapter (6) is provided with an abutment part (61), which can abut against the end of the support sleeve (5) away from the moving part assembly (2).

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