Vacuum capacitor

Abstract

The utility model discloses a vacuum capacitor, include: two electrode disc, directly or indirectly connect in two electrode disc and be configured with vacuum chamber in its inside insulating shell and two electrode groups that are fixed respectively in the inner end face of two electrode disc opposite each other and contain in vacuum chamber, two electrode groups all include a plurality of sheet shape interval arrangement distribution's electrode sheet, while the electrode sheet of two electrode groups extends to each other and does not contact each other mutually in parallel, so that the electrode sheet of two electrode groups presents the alternate distribution along the arrangement direction. The utility model discloses by adopting a plurality of sheet shape interval arrangement distribution's electrode sheet, can greatly simplify manufacturing process, has reduced the equipment procurement cost, makes vacuum capacitor's manufacturing cost and production cycle greatly drop, and product volume can achieve smaller, satisfies user to vacuum capacitor miniaturization and low cost's requirement.

Description

Technical Field

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

[0002] A vacuum capacitor is a type of capacitor with a ceramic insulating shell, a vacuum dielectric, and high-conductivity oxygen-free copper electrodes. 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 currently 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 ensure stable transmission of radio frequency power.

[0003] A vacuum capacitor consists of two sets of electrodes sealed in a vacuum. As a key component of a vacuum capacitor, the electrodes have a crucial impact on its performance, cost, and production efficiency. Currently, vacuum capacitor electrodes mainly come in two forms: cylindrical and spiral.

[0004] Cylindrical electrodes are typically manufactured using oxygen-free copper strip through a stamping press and die forming. Since each cylindrical electrode consists of multiple electrode rings of varying diameters, a large number of drawing dies (including dies and punches) are required, along with multiple drawing, thinning, and annealing processes. This complex manufacturing process not only results in high electrode manufacturing costs but also extremely low production efficiency.

[0005] Spiral electrodes are formed by winding metal strips fixed to positioning components. However, these electrodes require extremely high precision from specialized winding equipment and positioning components. To meet these high precision requirements, the procurement costs of positioning components and equipment increase significantly. High-precision winding equipment and positioning components are not only expensive, but wear or a decrease in precision in these components can also affect the winding quality of the electrode, thus impacting the overall performance of the vacuum capacitor.

[0006] In summary, traditional vacuum capacitors using cylindrical and spiral electrodes suffer from numerous problems during manufacturing, including complex processes, high costs, and low efficiency, making it difficult to meet the ever-increasing market demands for vacuum capacitors in terms of cost and production cycle. Therefore, a new vacuum capacitor structure is urgently needed to overcome these shortcomings and enhance the product's market competitiveness. Utility Model Content

[0007] The problem to be solved by this utility model is to provide a vacuum capacitor that overcomes the defects of traditional vacuum capacitors using cylindrical and spiral electrodes, which have complex manufacturing processes, high costs, and low efficiency.

[0008] The technical solution adopted by this utility model to solve its technical problem is: a vacuum capacitor, comprising: two electrode disks, an insulating shell directly or indirectly connected to the two electrode disks and having a vacuum chamber disposed therein, and two electrode groups respectively fixed to the inner end faces of the two electrode disks facing each other and housed in the vacuum chamber. Each of the two electrode groups includes a plurality of sheet-like electrode plates arranged at intervals. At the same time, the electrode plates of the two electrode groups extend parallel to each other and do not contact each other, so that the electrode plates of the two electrode groups are alternately distributed along the arrangement direction.

[0009] As a further improvement of this utility model, multiple positioning grooves are arranged at intervals on the inner end faces of the two electrode disks facing each other, and multiple electrode pieces of each of the two electrode groups are respectively fixed in the multiple positioning grooves on the corresponding electrode disks.

[0010] As a further improvement of this utility model, both electrode groups further include several positioning strips, and for any one electrode group, adjacent two electrode pieces are fixed by the positioning strips so that the multiple electrode pieces are parallel to each other and equally spaced.

[0011] As a further improvement of this utility model, the two electrode disks are respectively fixed to both ends of the insulating shell, and each of the two electrode disks is provided with an installation structure for fixing the vacuum capacitor in an external working position and simultaneously realizing electrical connection.

[0012] As a further improvement of this utility model, the mounting structure includes a connector and / or a first mounting hole disposed on the electrode disk.

[0013] As a further improvement of this utility model, the mounting structure includes a mounting plate, which is fixed to the outer end face of the electrode disk, and the mounting plate is provided with a plug-in portion that extends outward from the insulating shell, and the plug-in portion is provided with a second mounting hole.

[0014] As a further improvement of this utility model, the electrode plates of the two electrode groups are the same size; or the electrode plates of the two electrode groups are different sizes, but for any one electrode group, the multiple electrode plates it contains are the same size.

[0015] As a further improvement of this utility model, the electrode sheets of both electrode groups are formed by stamping metal strips.

[0016] As a further improvement of this utility model, the relative positions of the two electrode groups in the vacuum chamber are adjustable to change the coupling area between the two electrode groups.

[0017] As a further improvement of this utility model, the vacuum capacitor also includes a base, a bellows, and a transmission mechanism. The two electrode disks are a moving disk and a stator disk, respectively. The stator disk and the base are fixed to both ends of the insulating shell. The moving disk is located inside the insulating shell and connected to the transmission mechanism. The bellows is sealed between the base and the moving disk. The transmission mechanism is used to drive the moving disk and the electrode group fixed on the moving disk to move axially under the drive of an external power device.

[0018] The beneficial effects of this utility model are as follows: This utility model provides a vacuum capacitor, which greatly simplifies the manufacturing process by using multiple sheet-like electrode sheets arranged at intervals, reduces material waste and product scrap rate caused by process complexity during production, and greatly reduces equipment procurement costs, thereby significantly reducing the manufacturing cost and production cycle of the vacuum capacitor, and making the product size smaller, thus meeting users' requirements for miniaturization and low cost of vacuum capacitors. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a perspective view of Embodiment 1 of the vacuum capacitor of this utility model;

[0021] Figure 2 This is a cross-sectional view of Embodiment 1 of the vacuum capacitor of this utility model;

[0022] Figure 3 This is an exploded view of Embodiment 1 of the vacuum capacitor of this utility model;

[0023] Figure 4 This is a perspective view of the electrode assembly and electrode disk in Embodiment 1 of the vacuum capacitor of this utility model;

[0024] Figure 5 This is a cross-sectional view of Embodiment 2 of the vacuum capacitor of this utility model;

[0025] Figure 6 This is a cross-sectional view of Embodiment 3 of the vacuum capacitor of this utility model;

[0026] Figure 7 This is a cross-sectional view of Embodiment 4 of the vacuum capacitor of this utility model;

[0027] Figure 8 This is a perspective view of the electrode assembly in Embodiment 4 of the vacuum capacitor of this utility model;

[0028] Figure 9 This is a perspective view of embodiment five of the vacuum capacitor of this utility model;

[0029] Figure 10 This is an exploded view of Embodiment 5 of the vacuum capacitor of this utility model;

[0030] Figure 11 This is a cross-sectional view of Embodiment Six of the Vacuum Capacitor of this utility model.

[0031] Referring to the accompanying drawings, the following explanations are provided:

[0032] 1. Insulating outer shell; 101. Vacuum chamber; 2. Electrode assembly; 201. Electrode sheet;

[0033] 202. Positioning strip; 3. Electrode plate; 301. Positioning groove; 302. Connector; 303. First mounting hole; 304. Annular connecting platform; 4. Mounting plate; 401. Insertion part; 4011. Second mounting hole; 5. Base; 6. Bellows; 7. Positioning rod; 8. Rotating screw; 9. Positioning nut; 10. Guide sleeve; 11. Support sleeve. Detailed Implementation

[0034] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0035] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0037] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0039] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0040] Example 1

[0041] See Figures 1 to 4 The present invention provides a vacuum capacitor, comprising: two electrode disks 3, an insulating shell 1 fixedly connected to the two electrode disks 3 and having a vacuum chamber 101 disposed therein, and two electrode groups 2 respectively fixed to the inner end faces of the two electrode disks 3 facing each other and housed in the vacuum chamber 101.

[0042] As one of the important improvements in this application, both electrode groups 2 include multiple sheet-like electrode pieces 201, which are arranged at intervals and the electrode pieces 201 of the two electrode groups 2 are arranged in the same direction, and there is a gap between each adjacent electrode piece 201; the electrode pieces 201 of the two electrode groups 2 extend parallel to each other into the gap between them without contacting each other, so that the electrode pieces 201 of the two electrode groups 2 are alternately distributed along the arrangement direction.

[0043] The electrode assembly 2 of this novel vacuum capacitor employs multiple sheet-like electrode plates 201 arranged at intervals, eliminating the need for complex drawing dies and multiple drawing, thinning, and annealing processes required by traditional cylindrical electrodes. This avoids the manufacturing and maintenance costs of numerous dies, significantly simplifying the manufacturing process and reducing material waste and product scrap rates due to process complexity. For spiral electrodes, it also eliminates the reliance on expensive, high-precision specialized winding equipment and positioning components, greatly reducing equipment and positioning component procurement costs. Therefore, overall, the manufacturing cost and production cycle of this novel vacuum capacitor are significantly lower than those of traditional vacuum capacitors, enhancing the product's market competitiveness.

[0044] Among them, the electrode sheet 201 of the two electrode groups 2 can be a flat sheet structure or a sheet structure with curvature or arc shape, etc. In this embodiment, the electrode sheet 201 specifically adopts a flat rectangular sheet structure.

[0045] Since the vacuum capacitor of this utility model uses sheet-shaped electrode plates 201, the electrode plates 201 can be directly formed by stamping metal strips. Unlike traditional cylindrical electrodes, it does not require multiple complex processing steps, nor does it have the extremely high precision requirements for winding equipment and positioning parts as spiral electrodes. The use of sheet-shaped metal electrode plates 201 makes the production process simpler and more efficient, and can quickly complete the production of electrode plates 201, thereby significantly shortening the production cycle of vacuum capacitors, improving production efficiency, and enabling enterprises to respond to market demands more quickly.

[0046] like Figure 1 and Figure 4 As shown, in this embodiment, the insulating shell 1 is a cylindrical shape with open ends (it can be a round or square tube, etc., without limitation). Both electrode disks 3 are disk-shaped, and each electrode disk 3 has a thin-walled annular connecting platform 304 integrally machined on its inner end face facing each other. The two electrode disks 3 are respectively sealed and fixedly connected to both ends of the insulating shell 1 via their respective annular connecting platforms 304. The fixing method can be, but is not limited to, brazing. Simultaneously, a vacuum chamber 101 is formed between the insulating shell 1 and the two electrode disks 3. Of course, in other embodiments of this utility model, a separate connecting ring can be used instead of the annular connecting platform 304, and the two electrode disks 3 can be sealed and welded to both ends of the insulating shell 1 via a connecting ring.

[0047] The vacuum capacitor described in this embodiment is a fixed vacuum capacitor, meaning the coupling area of ​​the two electrode groups 2 is fixed and its capacitance is constant. The coupling area mentioned herein refers to the effective area of ​​the electrode plates 201 of the two electrode groups 2 that influences and interacts with each other under the influence of the electric field; that is, the area of ​​the electrode plates 201 of the two electrode groups 2 in the transverse direction (within...). Figure 2The area shown is the overlapping portion directly opposite the reference point.

[0048] In the design of vacuum capacitors, the distance between electrode plates 201 can be determined according to the required operating voltage; the size, number and coupling length of the electrode plates 201 of the two electrode groups 2 can be designed according to the external dimensions and capacitance of the vacuum capacitor.

[0049] For example, the insulating shell 1 can be made of ceramic material, and the electrode plates 201 of the two electrode groups 2 can be made of oxygen-free copper, stainless steel or other materials.

[0050] Preferably, the electrode sheets 201 of the two electrode groups 2 are the same size. In this way, only one mold is needed to stamp the metal strip to make the electrode sheet 201, thus greatly reducing the processing cost and manufacturing cycle of the electrode sheet 201.

[0051] Of course, in other embodiments of this utility model, the electrode sheets 201 of the two electrode groups 2 may have different sizes, but for any electrode group 2, the multiple electrode sheets 201 it contains must have the same size. The electrode sheets 201 of each of the two electrode groups 2 can be processed using two sets of molds.

[0052] It is worth mentioning that the insulating shell 1 and the two electrode disks 3 in this embodiment are both square, which can be adapted to the rectangular sheet structure of the electrode sheet 201, thereby maximizing space utilization, reducing the overall volume of the vacuum capacitor, and meeting the user's requirements for miniaturization and low cost of the vacuum capacitor.

[0053] Of course, in other embodiments of this utility model, the insulating shell 1 and the two electrode disks 3 can also be designed as circular or other shapes, and this utility model does not limit them.

[0054] See Figure 4 Multiple positioning grooves 301 are spaced apart on the inner end faces of the two electrode disks 3 facing each other. These positioning grooves 301 can be machined in one step using a CNC lathe, achieving high machining accuracy and efficiency. The wall thickness of the electrode sheet 201 is the same as the width of the positioning groove 301, and the width of the electrode sheet 201 is the same as the length of the positioning groove 301. Multiple electrode sheets 201 of each of the two electrode groups 2 are respectively fixed within the multiple positioning grooves 301 on the corresponding electrode disk 3. The fixing method can be, but is not limited to, brazing. This invention uses multiple positioning grooves 301 spaced apart on the two electrode disks 3 to position the electrode sheets 201, ensuring the assembly accuracy of the electrode sheets 201 and guaranteeing that the multiple electrode sheets 201 are evenly spaced and parallel to each other, thereby ensuring the capacitance accuracy of the vacuum capacitor.

[0055] The spacing between two adjacent positioning slots 301 is kept consistent to ensure that the spacing between multiple electrode pieces 201 is kept consistent.

[0056] In addition, this utility model has an installation structure on both electrode disks 3 for fixing the vacuum capacitor to the external working position and realizing electrical connection.

[0057] like Figure 1 As shown, in this embodiment, the mounting structure specifically includes a mounting plate 4. The mounting plate 4 is fixed on the outer end faces of the two electrode disks 3 facing away from each other. The fixing method can be, but is not limited to, brazing.

[0058] Furthermore, the mounting plate 4 is provided with a plug-in portion 401 extending outward from the insulating shell 1. The plug-in portion 401 may be triangular, but is not limited to, and the plug-in portions 401 of the upper and lower mounting plates 4 face the same direction. When the vacuum capacitor is in use, the two plug-in portions 401 can be directly inserted into the slots of the external working position, such as the slots of the circuit board, making the installation of the vacuum capacitor simple and quick.

[0059] The plug-in portion 401 may also be provided with a second mounting hole 4011, which can be used to fix the vacuum capacitor with fasteners or to connect to a circuit.

[0060] The assembly process of this novel vacuum capacitor is as follows:

[0061] After the two electrode groups 2 are respectively installed into the two electrode disks 3, they are fixed on the mounting plate 4 with clamps and fixed into components by high-temperature welding with solder; then the two components are inserted into each other and fixed at both ends of the insulating shell 1 with clamps, and high-temperature welding with solder is performed in a vacuum furnace to achieve sealing.

[0062] Example 2

[0063] The difference between this embodiment and Embodiment 1 is that the installation structure is different.

[0064] See Figure 5 The mounting structure in this embodiment includes a connector 302, which is fixed to the middle of the outer end face of the electrode disk 3 and protrudes from the outer end face of the electrode disk 3. The fixing method can be, but is not limited to, brazing. In addition, the connector 302 is provided with external threads to facilitate the fixed installation of the vacuum capacitor.

[0065] Example 3

[0066] The difference between this embodiment and Embodiment 1 is that the installation structure is different.

[0067] See Figure 6In this embodiment, the mounting structure includes a first mounting hole 303, which is located at the center of the outer end face of the electrode disk 3. Furthermore, the first mounting hole 303 is a blind hole with internal threads to facilitate the fixed mounting of the vacuum capacitor.

[0068] Understandably, the thickness of the electrode disk 3 can be designed to meet the depth requirements of the first mounting hole 303.

[0069] Of course, in other embodiments of this utility model, the mounting structure may also include the connector 302 as described in Embodiment 2 and the first mounting hole 303 as described in Embodiment 3.

[0070] Example 4

[0071] The difference between this embodiment and any of the embodiments in Embodiments 1 to 3 is that the positioning method of the electrode sheet 201 is different. In this embodiment, it is not necessary to set the positioning groove 301 on the inner end face of the electrode disk 3. Instead, the positioning of the electrode sheet 201 is achieved by the following means.

[0072] See Figure 7 and Figure 8 Both electrode groups 2 also include several positioning strips 202. For any electrode group 2, two adjacent electrode pieces 201 are fixed by the positioning strips 202 so that the multiple electrode pieces 201 are parallel to each other and distributed at equal intervals.

[0073] In this embodiment, by fixing each adjacent electrode piece 201 with a positioning strip 202, the assembly accuracy of the electrode pieces 201 can be ensured, and the multiple electrode pieces 201 can be evenly spaced and parallel to each other, thereby ensuring the capacitance accuracy of the vacuum capacitor.

[0074] In this embodiment, the positioning bar 202 is a square column, which can be processed by mold. Its production efficiency is higher than that of machining the positioning groove 301 on the electrode plate 3 using a CNC lathe, thus further reducing the production cycle of the vacuum capacitor.

[0075] During production, multiple electrode pieces 201 can be welded together as a whole using several positioning strips 202, and then assembled with the electrode disk 3.

[0076] Preferably, a number of positioning strips 202 are welded to the same end of the electrode sheet 201, and the positioning strips 202 are flush with the end face of the electrode sheet 201; at the same time, an assembly groove is provided on the inner end face of the two electrode disks 3 facing each other, and the multiple electrode sheets 201 and the number of positioning strips 202 welded into a whole are positioned in the assembly groove to ensure the installation position accuracy of the electrode group 2.

[0077] Example 5

[0078] The difference between this embodiment and any of the embodiments in Embodiments 1 to 4 is that the shapes of the insulating shell 1 and the electrode disk 3 are different.

[0079] See Figure 9 and Figure 10 In this embodiment, the insulating shell 1 and the two electrode disks 3 are both circular in shape, and the two electrode groups 2 are housed in the vacuum chamber 101 formed by the insulating shell 1 and the two electrode disks 3.

[0080] Example 6

[0081] The difference between this embodiment and any one of the embodiments one through five is that in this embodiment, the vacuum capacitor is a variable vacuum capacitor, that is, the relative position of the two electrode groups 2 in the vacuum chamber 101 can be adjusted to change the coupling area between the two electrode groups 2, so that its capacitance can be adjusted.

[0082] See Figure 11 In addition to the insulating shell 1, two electrode groups 2, and two electrode disks 3, the vacuum capacitor also includes a base 5, a bellows 6, and a transmission mechanism. In this embodiment, the two electrode disks 3 are a moving disk and a stator disk, respectively. The stator disk and the base 5 are fixed to the upper and lower ends of the insulating shell 1, respectively. The moving disk is located inside the insulating shell 1 and connected to the transmission mechanism. The bellows 6 is sealed between the base 5 and the moving disk, forming a vacuum chamber 101 between the insulating shell 1, the base 5, the bellows 6, the moving disk, and the stator disk. The two electrode groups 2 are housed together in the vacuum chamber 101, and are respectively fixed to the inner end faces of the moving disk and the stator disk facing each other. The transmission mechanism is used to drive the moving disk and the electrode groups 2 fixed on the moving disk to move axially under the drive of an external power device.

[0083] Furthermore, the transmission mechanism includes a positioning rod 7, a rotating screw 8, and a positioning nut 9. A guide sleeve 10 is fixedly installed in the middle of the base 5, with its lower end extending into the bellows 6; the lower end of the positioning rod 7 is fixedly connected to the moving disc, and its upper end slides within the guide sleeve 10; the positioning nut 9 is fixed in the central hole at the upper end of the positioning rod 7. In addition, a support sleeve 11 is fixedly installed on the top of the guide sleeve 10, and the rotating screw 8 is rotatably mounted on the support sleeve 11 via a bearing and threadedly connected to the positioning nut 9.

[0084] The rotating screw 8 is connected to an external power device such as a motor. When the motor drives the rotating screw 8 to rotate, the rotating screw 8 will drive the positioning rod 7 to move axially through the positioning nut 9, and simultaneously drive the moving disk and the electrode group 2 fixed on the moving disk to move, so as to change the coupling area between the two electrode groups 2, thereby realizing the adjustment of the capacitor value.

[0085] The axial direction mentioned above can be understood as the axial direction of the positioning rod 7.

[0086] It should be noted that the structure of the two electrode groups 2 and the assembly method of them with the two electrode disks 3 can be implemented in any one of the embodiments from Embodiment 1 to Embodiment 5, and will not be repeated here.

[0087] Similarly, the shape of the insulating shell 1 and the electrode disk 3 is not limited. It can be square as described in Embodiment 1, or circular as described in Embodiment 5, or other shapes. In this embodiment, square is preferred, as it can be adapted to the sheet-like electrode 201 to reduce the overall volume of the vacuum capacitor and meet the user's miniaturization requirements for the vacuum capacitor.

[0088] In summary, the vacuum capacitor of this invention, by employing multiple sheet-like electrode plates 201 arranged at intervals, can greatly simplify the manufacturing process, reduce material waste and product scrap rate caused by process complexity during production, and significantly reduce equipment procurement costs. This results in a substantial reduction in the manufacturing cost and production cycle of the vacuum capacitor, and the product size can be made smaller, meeting users' requirements for miniaturization and low cost of vacuum capacitors.

[0089] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0090] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A vacuum capacitor comprising two electrode disks (3), an insulating outer shell (1) directly or indirectly connected to the two electrode disks (3) and having a vacuum chamber (101) disposed therein, and two electrode groups (2) respectively fixed to the inner end faces of the two electrode disks (3) facing each other and housed in the vacuum chamber (101), characterized in that: Both electrode groups (2) include a plurality of sheet-like electrode sheets (201) arranged at intervals. The electrode sheets (201) of the two electrode groups (2) extend parallel to each other and do not contact each other, so that the electrode sheets (201) of the two electrode groups (2) are alternately distributed along the arrangement direction.

2. The vacuum capacitor according to claim 1, characterized in that: Multiple positioning grooves (301) are arranged at intervals on the inner end faces of the two electrode disks (3) facing each other, and multiple electrode pieces (201) of each of the two electrode groups (2) are respectively fixed in the multiple positioning grooves (301) on the corresponding electrode disks (3).

3. The vacuum capacitor according to claim 1, characterized in that: Both electrode groups (2) further include several positioning strips (202), and for any one electrode group (2), two adjacent electrode pieces (201) are fixed by the positioning strips (202) so that the multiple electrode pieces (201) are parallel to each other and equally spaced.

4. The vacuum capacitor according to claim 1, characterized in that: The two electrode disks (3) are respectively fixed to both ends of the insulating shell (1), and each of the two electrode disks (3) is provided with an installation structure for fixing the vacuum capacitor in the external working position and realizing electrical connection.

5. The vacuum capacitor according to claim 4, characterized in that: The mounting structure includes a connector (302) and / or a first mounting hole (303) disposed on the electrode disk (3).

6. The vacuum capacitor according to claim 4, characterized in that: The mounting structure includes a mounting plate (4), which is fixed to the outer end face of the electrode disk (3). The mounting plate (4) is provided with a plug-in portion (401) extending outward from the insulating shell (1). The plug-in portion (401) is provided with a second mounting hole (4011).

7. The vacuum capacitor according to claim 1, characterized in that: The electrode sheets (201) of the two electrode groups (2) are the same size; or the electrode sheets (201) of the two electrode groups (2) are different in size, but for any one of the electrode groups (2), the multiple electrode sheets (201) contained therein are the same size.

8. The vacuum capacitor according to claim 1, characterized in that: The electrode sheets (201) of both electrode groups (2) are formed by stamping metal strips.

9. The vacuum capacitor according to claim 1, characterized in that: The relative positions of the two electrode groups (2) in the vacuum chamber (101) are adjustable to change the coupling area between the two electrode groups (2).

10. The vacuum capacitor according to claim 9, characterized in that: It also includes a base (5), a bellows (6) and a transmission mechanism. The two electrode disks (3) are a moving disk and a stator disk, respectively. The stator disk and the base (5) are fixed to the two ends of the insulating shell (1). The moving disk is located inside the insulating shell (1) and connected to the transmission mechanism. The bellows (6) is sealed between the base (5) and the moving disk. The transmission mechanism is used to drive the moving disk and the electrode group (2) fixed on the moving disk to move axially under the drive of an external power device.

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