High-safety low-voltage parallel capacitor
By employing explosion-proof strips and fasteners in low-voltage parallel capacitors, the risk of explosion caused by shell expansion is eliminated, thereby improving the safety and stability of the capacitors.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-04-07
AI Technical Summary
The risk of explosion caused by the expansion of the casing of low-voltage parallel capacitors during use is difficult to avoid effectively.
A capacitor comprising a cylindrical shell, a coaxial core rod, and a capacitor assembly is designed. The shell is equipped with an explosion-proof band. The capacitor assembly is connected to the terminal block and can be broken by the expansion of the shell. When the shell expands, the explosion-proof band straightens. Fixing components and an insulating plate are combined to enhance structural stability and safety.
This effectively avoids the risk of capacitor casing expansion and explosion, improves the safety performance and structural stability of the capacitor, and reduces short circuits and the risk of slippage during operation.
Smart Images
Figure CN224096570U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the field of low-voltage shunt capacitors, in particular to a high-safety low-voltage shunt capacitor. BACKGROUND
[0002] The low-voltage shunt capacitor adopts a metalized film as a dielectric, and a metal layer is uniformly distributed on the surface of the film through evaporation technology to form the plates of the capacitor. When the capacitor encounters an overvoltage or a dielectric breakdown caused by partial discharge during operation, the metal layer around the breakdown point will evaporate rapidly to form a small conductive channel, thereby short-circuiting the breakdown point and limiting the expansion of the fault range.
[0003] However, in actual use, the low-voltage shunt capacitor has a cylindrical shell. When the electrolyte is heated and expands, gas is generated in the shell of the capacitor, which causes the shell of the capacitor to expand. When the shell expands to a certain extent, an explosion will occur.
[0004] Therefore, a high-safety low-voltage shunt capacitor is needed to avoid the risk of explosion of the capacitor shell. CONTENT OF THE INVENTION
[0005] To avoid the risk of explosion of the capacitor shell, a high-safety low-voltage shunt capacitor is provided.
[0006] The above application purpose of the application is achieved by the following technical scheme:
[0007] The high-safety low-voltage shunt capacitor comprises a cylindrical shell, a core rod coaxial with the shell is arranged in the shell, a capacitor assembly is arranged on the outer periphery of the core rod, a terminal block electrically connected to the capacitor assembly is arranged above the capacitor assembly, and an explosion-proof belt recessed towards the inside of the shell is fixed on the outer peripheral sidewall of the shell.
[0008] Through the above technical scheme, when the capacitor assembly is heated and drives the shell to expand, the explosion-proof belt is straightened from the folded state, the connection between the capacitor assembly and the terminal of the terminal segment is pulled off due to the expansion of the shell, and then the capacitor assembly no longer continues to heat, thereby avoiding the risk of continuous expansion and explosion of the shell and improving the safety performance of the low-voltage shunt capacitor.
[0009] Optionally, the explosion-proof belt is arranged above the capacitor assembly.
[0010] Through the above technical scheme, the part of the explosion-proof belt recessed towards the inside of the shell can limit the capacitor assembly, can increase the stability of the internal structure of the capacitor, can reduce the risk of failure caused by vibration or displacement of the capacitor assembly, and can improve the structural stability of the capacitor assembly after installation.
[0011] Optionally, insulating paper is mounted on the outer periphery of the capacitor assembly.
[0012] By adopting the above technical solution, the capacitor will generate heat during operation. As a good thermal conductor, the insulating paper can help the capacitor assembly dissipate heat better. At the same time, the use of insulating paper can improve the dielectric withstand voltage of the capacitor assembly, enabling the capacitor to work stably at higher voltages.
[0013] Optionally, the capacitor assembly includes three capacitor cores, and each of the three capacitor cores has three insulating plates mounted on its bottom.
[0014] By adopting the above technical solution, the insulating board can effectively isolate the electrical connection between capacitor cores, prevent short circuits, and at the same time, the insulating board can better dissipate the heat inside the capacitor assembly, avoid damage to the capacitor assembly due to overheating, and ensure the safety and reliability of the capacitor during operation.
[0015] Optionally, an abutment ring is fixed on the outer peripheral sidewall of the housing, and a fixing member is installed on the outer peripheral sidewall of the housing, with the top of the fixing member abutting against the bottom of the abutment ring.
[0016] By adopting the above technical solution, when installing and moving low-voltage parallel capacitors, since the metal shell surface of the low-voltage parallel capacitors is relatively smooth and the overall volume of the capacitors is relatively large, a fixing component is added to facilitate the operator to move the capacitors through the fixing component and reduce the risk of the capacitors slipping from the operator's hands.
[0017] Optionally, the abutment ring is located above the explosion-proof belt, and the fastener is sleeved on the outer periphery of the explosion-proof belt.
[0018] By adopting the above technical solution, when the capacitor assembly is heated and the outer shell expands, the explosion-proof strip will be straightened from the folded state, and the fixing component will restrict the explosion-proof strip, limiting the explosion-proof strip to deformation only in the axial direction of the outer shell.
[0019] Optionally, the fastener includes a first connecting ring and a second connecting ring. A limiting post is fixed on the end of the first connecting ring, and a limiting hole is opened on the end of the second connecting ring. The first connecting ring and the second connecting ring are fastened to each other and sleeved on the outer peripheral side wall of the housing, and the limiting post is inserted into the limiting hole.
[0020] By adopting the above technical solution, the fastener is provided with a first connecting ring and a second connecting ring. The first connecting ring and the second connecting ring are inserted into the limiting hole through the limiting post, which facilitates the installation and disassembly of the fastener, makes it easy to adjust the position of the fastener, improves the assembly and disassembly efficiency of the fastener, and improves the convenience of the process when the position of the capacitor needs to be adjusted.
[0021] Optionally, a fixing plate is installed on the end of both the first connecting ring and the end of the second connecting ring.
[0022] By adopting the above technical solution, when the capacitor is installed or moved, both the first connecting ring and the second connecting ring abut against the abutting ring. The addition of the fixing plate can increase the contact area between the operator and the fixing parts, thereby increasing the stability of the capacitor during installation or movement.
[0023] In summary, this application has at least the following beneficial effects:
[0024] 1. When the capacitor assembly is heated and the casing expands, the explosion-proof strap will be straightened from the folded state. The connection between the capacitor assembly and the terminal block will be broken by the expansion of the casing, thus the capacitor assembly will stop heating up and avoid the risk of the casing expanding and exploding, thereby improving the safety performance of low-voltage parallel capacitors.
[0025] 2. An insulating plate is added to the bottom of the capacitor core. The insulating plate can effectively isolate the electrical connection between the capacitor cores, prevent short circuits, and ensure the safety and reliability of the capacitor during operation.
[0026] 3. Fixtures are installed on the outer periphery of the capacitor, which facilitates the movement or installation of the capacitor by the operator. At the same time, the detachable connection of the fixtures facilitates the assembly and disassembly of the fixtures, thereby improving work efficiency. Attached image description:
[0027] Figure 1 This is a schematic diagram of the structure of a high-safety capacitor according to one embodiment;
[0028] Figure 2 This is a cross-sectional view of a first embodiment of a high-safety capacitor;
[0029] Figure 3 This is a schematic diagram of a second embodiment of a high-safety low-voltage parallel capacitor;
[0030] Figure 4 This is a cross-sectional view of a second embodiment of a high-safety low-voltage parallel capacitor.
[0031] Reference numerals: 1. Outer shell; 11. Explosion-proof strip; 12. Core rod; 13. Mounting post; 131. Fixing nut; 14. Abutment ring; 2. Terminal block; 21. Terminal block; 3. Capacitor assembly; 31. Capacitor core; 32. Metallized film; 33. Insulating paper; 34. Dielectric filling layer; 35. Insulating plate; 4. Protector; 5. Fixing component; 51. First connecting ring; 511. Limiting post; 52. Second connecting ring; 521. Limiting hole; 53. Fixing plate. Detailed implementation method:
[0032] The following section provides a more detailed description, in conjunction with the accompanying diagrams:
[0033] Example 1:
[0034] As attached Figure 1 and attached Figure 2 As shown, a high-safety capacitor includes a housing 1, a terminal block 2, and a capacitor assembly 3.
[0035] The outer casing 1 is cylindrical in shape, and an explosion-proof strip 11 that is recessed toward the inside of the outer casing 1 is fixed on the outer peripheral side wall of the outer casing 1.
[0036] The outer casing 1 has a core rod 12 coaxial with the outer casing 1. The core rod 12 is cylindrical in shape. One end of the core rod 12 is fixedly connected to the bottom of the outer casing 1, and the other end extends upward.
[0037] The capacitor assembly 3 is located on the outer periphery of the core rod 12 and below the explosion-proof strip 11. The capacitor assembly 3 includes three capacitor cores 31, which are vertically distributed on the outer periphery of the core rod 12. Three metallized films 32 are installed on the outer periphery of the three capacitor cores 31, and the three metallized films 32 are evenly spaced from each other.
[0038] The outer sides of the three metallized films 32 are covered with insulating paper 33. A dielectric filling layer 34 is provided between the insulating paper 33 and the inner wall of the outer shell 1. The insulating paper 33 can help the capacitor assembly 3 dissipate heat better. At the same time, the use of insulating paper 33 can improve the dielectric withstand voltage of the capacitor assembly 3, enabling the capacitor to work stably at higher voltages.
[0039] The terminal block 2 is located on the top of the housing 1 and is inserted into the top of the housing 1. The terminal block 2 is equipped with three terminals 21, which are evenly spaced and parallel to each other. A protector 4 is installed between the terminals 21 and the capacitor assembly 3. The protector 4 is located above the explosion-proof strip 11. The terminals 21 are connected to the input terminals of the protector 4, and the output terminals of the protector 4 are electrically connected to the capacitor assembly 3. The protector 4 is a prior art product in this field and will not be described in detail here.
[0040] The bottom of the housing 1 is provided with a mounting post 13, and a fixing nut 131 is provided on the mounting post 13 to facilitate the fixing of the low-voltage parallel capacitor.
[0041] The advantage of this embodiment is that when the capacitor assembly 3 is heated and the outer shell 1 expands, the explosion-proof strip 11 will be straightened from the folded state. The connection between the capacitor assembly 3 and the terminal block is broken by the expansion of the outer shell 1, so the capacitor assembly 3 will no longer continue to heat up, avoiding the risk of the outer shell 1 continuing to expand and explode, thus improving the safety performance of low-voltage parallel capacitors.
[0042] Example 2:
[0043] As attached Figure 3 As shown, this second embodiment is an improvement on the outer shell 1 and the capacitor assembly 3 based on the first embodiment.
[0044] An abutment ring 14 is fixed on the outer peripheral side wall of the outer casing 1. The abutment ring 14 is annular and is located above the explosion-proof strip 11.
[0045] A fastener 5 is also installed on the outer peripheral sidewall of the outer casing 1. The fastener 5 is ring-shaped and is sleeved on the outer peripheral sidewall of the outer casing 1 and located on the outer periphery of the explosion-proof strip 11. The top of the fastener 5 abuts against the bottom of the abutment ring 14.
[0046] The fastener 5 includes a first connecting ring 51 and a second connecting ring 52. Both the first connecting ring 51 and the second connecting ring 52 are semi-circular. Two limiting posts 511 are fixed to the two ends of the first connecting ring 51 facing the second connecting ring 52. Two limiting holes 521 are opened on the two ends of the second connecting ring 52 facing the first connecting ring 51. The first connecting ring 51 and the second connecting ring 52 abut against each other. The two limiting posts 511 are inserted into the two limiting holes 521, which facilitates the installation and disassembly of the fastener 5 and makes it easy to adjust the position of the fastener 5.
[0047] The ends of the first connecting ring 51 and the second connecting ring 52 are both fixed with fixing plates 53. The fixing plates 53 can increase the contact area between the operator and the fixing parts 5, thereby increasing the stability of the capacitor during installation or movement.
[0048] As attached Figure 4 As shown, the capacitor assembly 3 includes an insulating plate 35. There are three insulating plates 35, which are respectively installed at the bottom of the three capacitor cores 31. The three insulating plates 35 can effectively isolate the electrical connection between the capacitor cores 31 and prevent short circuits. At the same time, the insulating plates 35 can also better dissipate the heat inside the capacitor assembly 3.
[0049] The advantage of this embodiment 2 is that the capacitor casing 1 is equipped with an assembly-and-disassembly fastener 5. When it is necessary to install or move the capacitor, the capacitor can be moved through the fastener 5, which makes it convenient for the operator to move the capacitor through the fastener 5 and reduces the risk of the capacitor slipping from the operator's hand.
[0050] In summary, this capacitor utilizes the explosion-proof band 11 to buffer and limit the expansion of the outer casing 1, reducing the risk of the outer casing 1 expanding and exploding, thus improving the safety performance of low-voltage parallel capacitors. It also utilizes the fixing component 5 to facilitate the operator's movement of the capacitor, reducing the risk of the capacitor slipping from the operator's hands.
[0051] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of protection claimed in this application.
Claims
1. A high-safety low-voltage parallel capacitor, comprising a cylindrical shell (1), a core rod (12) coaxial with the shell (1) inside the shell (1), a capacitor assembly (3) on the outer periphery of the core rod (12), and a terminal block (2) electrically connected thereto above the capacitor assembly (3), characterized in that, An explosion-proof strip (11) is fixed on the outer peripheral sidewall of the outer shell (1) and recessed towards the inside of the outer shell (1).
2. The high-safety low-voltage parallel capacitor according to claim 1, characterized in that, The explosion-proof strip (11) is located above the capacitor assembly (3).
3. A high-safety low-voltage parallel capacitor according to claim 1, characterized in that, The outer periphery of the capacitor assembly (3) is covered with insulating paper (33).
4. A high-safety low-voltage parallel capacitor according to claim 1, characterized in that, The capacitor assembly (3) includes three capacitor cores (31), and each of the three capacitor cores (31) has three insulating plates (35) installed at its bottom.
5. A high-safety low-voltage parallel capacitor according to claim 1, characterized in that, An abutment ring (14) is fixed on the outer peripheral sidewall of the outer shell (1), and a fixing member (5) is installed on the outer peripheral sidewall of the outer shell (1). The top of the fixing member (5) abuts against the bottom of the abutment ring (14).
6. A high-safety low-voltage parallel capacitor according to claim 5, characterized in that, The abutment ring (14) is located above the explosion-proof belt (11), and the fastener (5) is sleeved on the outer periphery of the explosion-proof belt (11).
7. A high-safety low-voltage parallel capacitor according to claim 5, characterized in that, The fastener (5) includes a first connecting ring (51) and a second connecting ring (52). A limiting post (511) is fixed on the end of the first connecting ring (51), and a limiting hole (521) is opened on the end of the second connecting ring (52). The first connecting ring (51) and the second connecting ring (52) are fastened to each other and sleeved on the outer peripheral side wall of the outer shell (1), and the limiting post (511) is inserted into the limiting hole (521).
8. A high-safety low-voltage parallel capacitor according to claim 7, characterized in that, Fixing plates (53) are installed on the ends of the first connecting ring (51) and the second connecting ring (52).