Power electronic capacitor with stable installation

Abstract

The invention belongs to the technical field of capacitor production, and particularly relates to a power electronic capacitor stable in installation, which comprises a direct current support capacitor and a plurality of leading-out terminals vertically embedded at the top of the direct current support capacitor, the peripheral side of the pin is provided with a threaded groove extending along the axis direction of the pin, and the pin can be in threaded connection with a fastener through the threaded groove, wherein the fastener is used for installing and fixing the DC support capacitor and a device to be assisted. According to the invention, the limiting mechanism is arranged on the peripheral side of the pin of the DC support capacitor, so that when the DC support capacitor is connected with the to-be-assisted equipment through a fastener (nut), the limiting mechanism can limit the movement of the fastener; therefore, the connection position between the to-be-assisted equipment and the direct-current support capacitor is prevented from loosening due to vibration transmission generated by operation of the to-be-assisted equipment, and the installation stability of the direct-current support capacitor is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of capacitor production, and particularly relates to a power electronic capacitor with stable installation. Background Art

[0002] A capacitor is a passive electronic component that stores charge and electrical energy, consisting of two conductor plates (electrodes) and a dielectric in the middle. When a voltage is applied, the electrodes accumulate positive and negative charges respectively, forming an electric field for energy storage. Its capacitance is determined by the electrode area, dielectric properties, and electrode spacing. Capacitors have core functions such as blocking direct current and passing alternating current, filtering, coupling, and energy storage in a circuit;

[0003] Capacitors are widely used in electronic circuits and require a stable support structure to ensure their stability and reliability. Therefore, in the prior art, a bolt-supported capacitor has been designed. The lead terminals of the capacitor are brass-tinned bolts. By connecting the bolts with fasteners (nuts), the stable installation of the capacitor can be achieved while realizing the circuit connection of the capacitor.

[0004] For example, a bolt lead terminal capacitor with the publication number CN202405117U includes a square shell plastic capacitor body and lead terminals led out from the square shell plastic capacitor body. Among them, the lead terminals are bolt lead terminals. The bolt lead terminals include a copper bolt column led out from the square shell plastic capacitor body and a metal sheet fixed on the copper bolt column. The metal sheet is also located between the square shell plastic capacitor body and the copper bolt column. In the bolt lead terminal capacitor, the lead terminals of the capacitor are changed to bolt lead terminals. Since the cross-sectional area of the bolt is much larger than that of a wire or a connector thin sheet, the current-carrying capacity is strong, it can withstand large current impacts, and at the same time, the loss tangent value of the capacitor is also reduced.

[0005] However, due to the long-term vibration during the use of electronic devices, when the capacitor is installed with these devices, such as high-voltage inverters, photovoltaic inverters, electric locomotive / subway converters, or wind power generation converters, vibrations will also occur at the threaded connections, which will cause the fasteners to loosen, affecting the stability of the circuit.

[0006] In view of this, the present invention provides a power electronic capacitor with stable installation to solve the above problems. Summary of the Invention

[0007] To achieve the above object, the present invention provides the following technical solution: A power electronic capacitor with stable installation, including a DC support capacitor, and a plurality of lead terminals vertically embedded in the top of the DC support capacitor. The lead terminal has a columnar pin vertically arranged, and a threaded groove extending along its axis is provided on the periphery of the pin. The pin can be threadedly connected through the threaded groove with a fastener for installing and fixing the DC support capacitor to the equipment to be assisted.

[0008] Preferably, as a power electronic capacitor with stable installation of the present invention, a groove is radially provided on the periphery of the pin, and a limiting mechanism for restricting the movement of the fastener connected to the pin is provided in the groove.

[0009] Preferably, as a power electronic capacitor with stable installation of the present invention, the DC support capacitor includes a housing, and two groups of core bodies connected in parallel in the housing. The core bodies are connected to the lead terminals through conductive components.

[0010] Preferably, as a power electronic capacitor with stable installation of the present invention, an insulating sealing layer is filled between the housing and the two groups of core bodies.

[0011] Preferably, as a power electronic capacitor with stable installation of the present invention, the limiting mechanism includes a second groove deeply opened in the groove, and the radial dimension of the second groove is larger than the radial dimension of the groove.

[0012] Preferably, as a power electronic capacitor with stable installation of the present invention, a spring arranged along its axis and a limiting block connected to one end of the spring are provided in the second groove;

[0013] The limiting block has a protruding portion extending radially along the pin, and the protruding portion can elastically extend into or out of the groove through the spring;

[0014] A downwardly inclined slope is provided on the surface of the protruding portion close to the top of the pin.

[0015] Preferably, as a power electronic capacitor with stable installation of the present invention, the limiting mechanism is a limiting elastic sheet placed in the groove. The limiting elastic sheet is arranged in an arc along the axis of the pin, and its arched end can contract and protrude out of the groove.

[0016] Preferably, as a power electronic capacitor with stable installation of the present invention, the limiting mechanism includes a limiting dial block elastically torsionally connected at the top in the groove, and the bottom end of the limiting dial block can extend into or out of the groove under the action of an external force.

[0017] Preferably, for a power electronic capacitor with stable installation according to the present invention, a connecting shaft is inserted through the top end of the limiting block. Both ends of the connecting shaft are respectively connected to the opposite surfaces within the groove. A torsion spring is sleeved on the periphery of the connecting shaft. One end of the torsion spring is connected to the inside of the limiting block, and the other end is connected to the inner wall of the groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] By arranging a limiting mechanism on the periphery of the pins of the DC support capacitor in the present invention, when the DC support capacitor is connected to the device to be assisted through fasteners, such as high-voltage inverters, photovoltaic inverters, electric locomotive / subway converters or wind power generation converters, etc., the limiting mechanism will restrict the movement of the fasteners (nuts), thereby preventing the looseness of the connection between the DC support capacitor and the device to be assisted due to the vibration transmission generated during the operation of the device to be assisted, effectively improving the installation stability of the DC support capacitor and the stability of the circuit connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0021] Figure 1 is a three-dimensional structural schematic diagram of the DC support capacitor of the present invention;

[0022] Figure 2 is a cross-sectional structural schematic diagram of the DC support capacitor of the present invention;

[0023] Figure 3 is a three-dimensional structural schematic diagram of the first embodiment of the limiting mechanism of the present invention;

[0024] Figure 4 is a cross-sectional structural schematic diagram of the first embodiment of the limiting mechanism of the present invention;

[0025] Figure 5 is a three-dimensional structural schematic diagram of the second embodiment of the limiting mechanism of the present invention;

[0026] Figure 6 is a cross-sectional structural schematic diagram of the second embodiment of the limiting mechanism of the present invention;

[0027] Figure 7 is a three-dimensional structural schematic diagram of the third embodiment of the limiting mechanism of the present invention;

[0028] Figure 8 is a cross-sectional structural schematic diagram of the third embodiment of the limiting mechanism of the present invention.

[0029] In the figure: 1. DC support capacitor; 11. Housing; 12. Core body; 13. Lead terminal; 103. Pin; 14. Conductive component; 15. Insulating and sealing layer; 2. Limiting mechanism; 201. Groove; 202. Second groove; 203. Spring; 204. Limiting block; 205. Limiting elastic piece; 206. Limiting dial block; 207. Connecting shaft. Detailed implementation

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] The present invention relates to a power electronic capacitor with stable installation, such as Figures 1-2 shown, including: a DC support capacitor 1 and a plurality of lead terminals 13 vertically embedded in the top of the DC support capacitor 1. As Figure 2 shown, the DC support capacitor 1 includes a housing 11 and two groups of core bodies 12 connected in parallel in the housing 11. The core bodies 12 are connected to the lead terminals 13 through conductive components 14, and an insulating and sealing layer 15 is filled between the housing 11 and the two groups of core bodies 12.

[0032] The lead terminal 13 has a vertically arranged columnar pin 103, and a thread groove extending along its axis direction is provided on the periphery of the pin 103. The lead terminal 13 can be threadedly connected with a fastener (nut) adapted to the thread groove on the periphery of the pin 103 to realize its installation and fixation with the equipment to be assisted, such as: high-voltage frequency converter, photovoltaic inverter, electric locomotive / subway converter, wind power converter or an installation bracket for some capacitors. In order to prevent the loosening of the fastener after connection, a groove 201 is radially provided on the periphery of the pin 103, and a limiting mechanism 2 for restricting the movement of the fastener connected to the pin 103 is provided in the groove 201.

[0033] Figures 3-4The first embodiment of the limiting mechanism 2 of the present invention is shown, which includes a second groove 202 that is deeply opened within the groove 201 and has a radial dimension larger than that of the groove 201. In this embodiment, both the groove 201 and the second groove 202 are cylindrically opened. A spring 203 is provided within the second groove 202 along its axial direction, and a limiting block 204 is connected to one end of the spring 203. The limiting block 204 has a protruding portion that extends radially along the pin 103. The protruding portion can axially extend into or out of the groove 201 elastically through the spring 203. In this embodiment, the cross-section of the limiting block 204 is in a "T" shape, and the rod-shaped structure at the bottom of its "T" shape is the above-mentioned protruding portion.

[0034] During specific use, after inserting the pin 103 into the corresponding mounting hole of the auxiliary device, a fastener is threadedly connected to the pin 103. By rotating the fastener, the fastener slides downward along the axis of the pin 103. When it slides to the limiting block 204, by pressing the protruding portion of the limiting block 204, the limiting block 204 squeezes the spring 203 to contract into the groove 201. At the same time, the fastener is further screwed, so that the fastener continues to slide downward. After passing through the limiting block 204, the limiting block 204 automatically extends out of the groove 201 under the elastic action of the spring 203, restricting the movement of the fastener on the movement path of the fastener, thereby effectively preventing the fastener from loosening and detaching, and improving the stability of the installation of the DC support capacitor 1 and the circuit.

[0035] Furthermore, in order to enable the limiting block 204 to automatically contract into the groove 201 during the process of tightening and sliding down the fastener, a downwardly inclined slope can be provided on the surface of the protruding portion of the limiting block 204 near the top of the pin 103. At the same time, an arc chamfer can also be provided at the edge of the slope for better effect, as Figure 4 shown. When the fastener is tightened, through the guiding action of the slope, when the fastener slides down and contacts the limiting block 204, the limiting block 204 can gradually and automatically retract into the groove 201, thereby reducing the manual pressing process and making the installation more convenient.

[0036] Figures 5-6 The second embodiment of the limiting mechanism 2 of the present invention is shown. The difference from the first embodiment is that the limiting mechanism 2 is a limiting elastic piece 205 placed within the groove 201. The limiting elastic piece 205 is arc-shaped along the axis of the pin 103, as Figure 6 shown, and its arc-shaped arched end protrudes out of the groove 201. Since the limiting elastic piece 205 has a certain elasticity, therefore, by pressing the arc-shaped arched end of the limiting elastic piece 205, the arc-shaped arched end of the limiting elastic piece 205 can be deformed to contract into the groove 201. During use, when the fastener is tightened, the displacement movement of the fastener can be restricted on the movement path by the arc-shaped arched end of the limiting elastic piece 205, thereby effectively preventing it from loosening and detaching.

[0037] Figures 7-8 The third embodiment of the limiting mechanism 2 of the present invention is shown. The difference from the first embodiment is that the limiting mechanism 2 is a limiting dial block 206 elastically and torsionally connected to the inside of the groove 201 at the top. In this embodiment, as a preferred, the groove 201 is square. Specifically, as Figure 8 shown, a connecting shaft 207 is inserted through the top end of the limiting dial block 206, and both ends of the connecting shaft 207 are connected to the opposite surfaces inside the groove 201, so that the top end of the limiting dial block 206 is rotatably connected to the inside of the groove 201. In order to make the limiting dial block 206 have a certain torsional force, a torsion spring (not marked in the figure) is sleeved on the periphery of the connecting shaft 207. One end of the torsion spring is fixedly connected to the inside of the limiting dial block 206, and the other end is fixedly connected to the inner wall of the groove 201.

[0038] When the torsion spring is in the self-heating state, the bottom end of the limiting dial block 206 extends obliquely out of the groove 201 along the tightening direction of the fastener. When the limiting dial block 206 is subjected to an external pressure, its bottom end can twist the torsion spring to rotate and retract into the groove 201. During use, by the extension of the bottom end of the limiting dial block 206, the displacement of the fastener is restricted on the movement path of the fastener. By the retraction of the bottom end of the limiting dial block 206, the movement restriction on the fastener can be released. Therefore, through the above characteristics, when the fastener is installed and tightened, its displacement is restricted; when disassembled, it will not block its movement. Thus, the actual use requirements of stable installation and detachable of the DC support capacitor 1 are realized.

[0039] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power electronic capacitor with stable installation, comprising a DC support capacitor (1), and a plurality of lead terminals (13) vertically embedded on the top of the DC support capacitor (1), characterized in that: The lead terminal (13) has a vertically arranged columnar pin (103), a thread groove extending along the axial direction of the pin (103) is provided on the peripheral side of the pin (103), and the pin (103) can be threadedly connected to a fastener for mounting and fixing the DC support capacitor (1) to the auxiliary equipment through the thread groove.

2. The stable installation power electronic capacitor according to claim 1, characterized in that: A groove (201) is radially provided on the circumferential side of the pin (103), and a limiting mechanism (2) for limiting the movement of a fastener connected to the pin (103) is provided in the groove (201).

3. The stable installation power electronic capacitor according to claim 1, characterized in that: The DC support capacitor (1) comprises a shell (11) and two groups of cores (12) arranged in parallel and connected inside the shell (11); the cores (12) are connected to the lead terminals (13) via conductive components (14).

4. The stable installation power electronic capacitor according to claim 3, characterized in that: An insulating sealing layer (15) is filled between the shell (11) and the two groups of cores (12).

5. The stable installation power electronic capacitor according to claim 2, characterized in that: The limiting mechanism (2) comprises a second groove (202) which is deepened and opened in the groove (201); the radial dimension of the second groove (202) is greater than the radial dimension of the groove (201).

6. The stable installation power electronic capacitor according to claim 5, characterized in that: The second groove (202) is provided with a spring (203) arranged along its axial direction, and a limit block (204) connected to one end of the spring (203); The limiting block (204) has a protrusion extending radially along the pin (103), and the protrusion can extend into or out of the groove (201) through the elasticity of the spring (203); A surface of the protruding portion close to the top of the pin (103) is provided with a downwardly inclined slope.

7. The stable installation power electronic capacitor according to claim 2, characterized in that: The limiting mechanism (2) is a limiting spring piece (205) disposed in the groove (201); the limiting spring piece (205) is arranged in an arc shape along the axial direction of the pin (103), and its arc-shaped arched end can be retracted and protrude outside the groove (201).

8. The power electronic capacitor with stable installation according to claim 2, characterized in that: The limiting mechanism (2) comprises a limiting block (206) whose top end is elastically twistedly connected to the groove (201); the bottom end of the limiting block (206) can extend into or out of the groove (201) under the action of an external force.

9. The stable mounted power electronic capacitor according to claim 8, characterized in that: A connecting shaft (207) is inserted through the top end of the limit shift block (206), and two ends of the connecting shaft (207) are respectively connected to opposite surfaces in the groove (201). A torsion spring is sleeved on the circumference of the connecting shaft (207), and one end of the torsion spring is connected to the limit shift block (206), and the other end is connected to the inner wall of the groove (201).

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