DC-Link capacitor capable of monitoring internal temperature

Abstract

The utility model discloses a DC-Link capacitor capable of monitoring internal temperature. Two groups of capacitor nut connecting terminals (2) are arranged at the top of a plastic protective shell (11); a double-core parallel structure is adopted in the metal shell (1), a capacitor core I (3) and a capacitor core II (9) are arranged in the metal shell (1), and the capacitor core I (3) comprises an upper part connecting core strip I (4) and a lower part connecting core strip I (5); a capacitor core rod (12) is arranged in the center of the capacitor core I (3) and the capacitor core II (9) in an up-down penetrating mode, the capacitor core rod (12) is in a hollow shape, and a PT100 temperature sensor (10) is installed in the hollow shape. According to the utility model, the PT100 temperature sensor is arranged at the central position in the capacitor core rod, so that the temperature of a hot spot in the capacitor can be measured, the temperature of the hot spot in the capacitor can be monitored or controlled especially in a severe environment and an occasion where use conditions are not known, and damage to the whole set of equipment caused by failure of the capacitor is avoided.

Description

Technical Field

[0001] This invention relates to the field of capacitor technology, and in particular to a DC-Link capacitor capable of monitoring internal temperature. Background Technology

[0002] DC-Link capacitors offer advantages such as high voltage withstand capability, high current withstand capability, low impedance, low inductance, long lifespan, non-polarity, and easy installation, making them widely used in the power electronics industry. Current DC-Link capacitors utilize cylindrical aluminum casings and can be configured as single-core, dual-core, or triple-core capacitors in parallel, encapsulated with flame-retardant epoxy. However, current DC-Link capacitors suffer from the inability to monitor their internal temperature in real time. Excessive internal temperature can lead to capacitor damage and even safety hazards.

[0003] To address this issue, this invention proposes a DC-Link capacitor capable of monitoring internal temperature. Utility Model Content

[0004] To address the problems existing in the prior art, this invention provides a DC-Link capacitor capable of monitoring internal temperature. By placing a PT100 temperature sensor at the center of the capacitor core, this capacitor can measure the temperature of hot spots inside the capacitor. This is particularly useful in harsh environments and situations where operating conditions are unknown, allowing for the monitoring or control of internal hot spot temperatures and preventing capacitor failure from damaging the entire equipment.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A DC-Link capacitor capable of monitoring internal temperature includes a U-shaped metal casing 1 and a cylindrical plastic protective casing 11. The top of the metal casing 1 is fitted over the bottom of the plastic protective casing 11. Two sets of capacitor nut connection terminals 2 are provided on the top of the plastic protective casing 11. The interior of the metal casing 1 adopts a dual-core parallel structure, with capacitor core I3 and capacitor core II9, with capacitor core I3 located in the lower layer and capacitor core II9 located in the upper layer. Capacitor core I3 includes an upper connecting core bar I4 and a lower connecting core bar I5. Capacitor core II9 includes an upper connecting core bar II6 and a lower connecting core bar II7. A capacitor core rod 12 is provided vertically through the center of capacitor core I3 and capacitor core II9. The capacitor core rod 12 is hollow, and a PT100 temperature sensor 10 is installed inside the hollow shape.

[0007] This utility model also has the following additional technical features:

[0008] As a further specific optimization of the technical solution of this utility model: the two sets of capacitor nut connecting terminals 2 include a left capacitor nut connecting terminal 21 and a right capacitor nut connecting terminal 22, the lower part connecting core bar I5 and the upper part connecting core bar II6 are connected to the left capacitor nut connecting terminal 21; the upper part connecting core bar I4 and the lower part connecting core bar II7 are connected to the right capacitor nut connecting terminal 22.

[0009] As a further specific optimization of the technical solution of this utility model: the lower part of the capacitor core II9 is ​​connected to the core strip II7 on the right side of the metal shell 1 and the plastic protective shell 11, and is respectively connected to the lower end of the capacitor core II9 and the right capacitor nut connecting terminal 22.

[0010] As a further specific optimization of the technical solution of this utility model: an insulating protective jacket 13 is provided at the bottom of the outer shell 1. The insulating protective jacket 13 is made of epoxy insulating material. The insulating protective jacket 13 is used to prevent the capacitor core I3 from contacting the bottom of the metal outer shell 1 and causing discharge.

[0011] As a further specific optimization of the technical solution of this utility model: both capacitor core I3 and capacitor core II9 are wrapped with an insulating protective film 8.

[0012] As a further specific optimization of the technical solution of this utility model: the materials of the upper connecting core bar I4, the lower connecting core bar I5, the upper connecting core bar II6 and the lower connecting core bar II7 are copper bars.

[0013] As a further specific optimization of the technical solution of this utility model: capacitor core I3 and capacitor core II9 are DC-Link capacitors.

[0014] Compared with the prior art, the advantages of this utility model are:

[0015] This invention relates to a capacitor that uses a PT100 temperature sensor placed at the center of the capacitor core to measure the temperature of hot spots inside the capacitor. This is especially useful in harsh environments and situations where the operating conditions are unknown, as it can monitor or control the internal hot spot temperature and prevent capacitor failure from damaging the entire equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the DC-Link capacitor structure of this utility model. Detailed Implementation

[0017] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

[0018] A DC-Link capacitor capable of monitoring internal temperature includes a U-shaped metal casing 1 and a cylindrical plastic protective casing 11; the top of the metal casing 1 is fitted over the bottom of the plastic protective casing 11. The U-shaped design of the metal casing 1 not only enhances the structural strength of the capacitor but also effectively improves heat dissipation efficiency, ensuring stable operation of the capacitor under high loads. The plastic protective casing 11 is made of high-temperature resistant and flame-retardant materials, effectively preventing the risk of fire under abnormal conditions and improving overall safety.

[0019] The top of the plastic protective shell 11 is provided with two sets of capacitor nut connection terminals 2; the two sets of capacitor nut connection terminals 2 include a left capacitor nut connection terminal 21 and a right capacitor nut connection terminal 22, the lower part of the connecting core bar I5 and the upper part of the connecting core bar II6 are connected to the left capacitor nut connection terminal 21; the upper part of the connecting core bar I4 and the lower part of the connecting core bar II7 are connected to the right capacitor nut connection terminal 22.

[0020] The interior of the metal casing 1 adopts a dual-core parallel structure, with capacitor core I3 and capacitor core II9. Capacitor core I3 and capacitor core II9 are DC-Link capacitors.

[0021] Capacitor core I3 is located in the lower layer, and capacitor core II9 is ​​located in the upper layer. Capacitor core I3 includes an upper connecting strip I4 and a lower connecting strip I5; capacitor core II9 includes an upper connecting strip II6 and a lower connecting strip II7. A capacitor core rod 12 is vertically inserted through the center of both capacitor cores I3 and II9. The capacitor core rod 12 is hollow, and a PT100 temperature sensor 10 is installed inside. The PT100 temperature sensor 10 is connected to an external temperature display device via wires, transmitting the internal temperature information of the capacitor to the external display in real time for easy monitoring and maintenance. In addition to serving as a carrier for the PT100 temperature sensor 10, the capacitor core rod 12 also supports and fixes capacitor cores I3 and II9, ensuring the stability and reliability of the capacitor structure.

[0022] The lower part of capacitor core II9 is ​​connected to the core strip II7 on the right side of the metal shell 1 and the plastic protective shell 11, and is connected to the lower end of capacitor core II9 and the right capacitor nut connection terminal 22 respectively.

[0023] An insulating protective jacket 13 is provided at the bottom of the metal casing 1. The insulating protective jacket 13 is made of epoxy insulating material. The insulating protective jacket 13 is used to prevent the capacitor core 13 from contacting the bottom of the metal casing 1 and causing discharge.

[0024] Both capacitor cores I3 and II9 are wrapped with an insulating protective film 8. The insulating protective film 8 not only enhances the insulation performance of the capacitor cores, but also improves the capacitor's voltage withstand capability and service life.

[0025] The upper connecting core I4, lower connecting core I5, upper connecting core II6, and lower connecting core II7 are all made of copper. The use of copper provides excellent conductivity and mechanical strength, ensuring reliable connections between the capacitor cores. Furthermore, the use of copper helps improve the capacitor's heat dissipation efficiency, further ensuring stable operation under high loads.

[0026] The above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

Claims

1. A DC-Link capacitor capable of monitoring internal temperature, characterized in that: It includes a U-shaped metal shell (1) and a cylindrical plastic protective shell (11); the top of the metal shell (1) is fitted over the bottom of the plastic protective shell (11); the top of the plastic protective shell (11) is provided with two sets of capacitor nut connection terminals (2); the interior of the metal shell (1) adopts a dual-core parallel structure, and is provided with capacitor core I (3) and capacitor core II (9), with capacitor core I (3) located in the lower layer and capacitor core II (9) located in the upper layer; capacitor core I (3) includes an upper part connecting core bar I (4) and a lower part connecting core bar I (5); capacitor core II (9) includes an upper part connecting core bar II (6) and a lower part connecting core bar II (7); wherein, a capacitor core rod (12) is provided vertically through the center of capacitor core I (3) and capacitor core II (9), and the capacitor core rod (12) is hollow, with a PT100 temperature sensor (10) installed inside the hollow shape.

2. The DC-Link capacitor capable of monitoring internal temperature according to claim 1, characterized in that: The two sets of capacitor nut connection terminals (2) include a left capacitor nut connection terminal (21) and a right capacitor nut connection terminal (22). The lower part of the connecting core bar I (5) and the upper part of the connecting core bar II (6) are connected to the left capacitor nut connection terminal (21); the upper part of the connecting core bar I (4) and the lower part of the connecting core bar II (7) are connected to the right capacitor nut connection terminal (22).

3. The DC-Link capacitor capable of monitoring internal temperature according to claim 1, characterized in that: The lower part of capacitor core II (9) is connected to core strip II (7) on the right side of metal shell (1) and plastic protective shell (11), and is connected to the lower end of capacitor core II (9) and right capacitor nut connection terminal (22) respectively.

4. The DC-Link capacitor capable of monitoring internal temperature according to claim 1, characterized in that: An insulating protective jacket (13) is provided at the bottom of the metal casing (1). The insulating protective jacket (13) is made of epoxy insulating material. The insulating protective jacket (13) is used to prevent the capacitor core I (3) from contacting the bottom of the metal casing (1) and causing discharge.

5. The DC-Link capacitor capable of monitoring internal temperature according to claim 1, characterized in that: Both capacitor core I (3) and capacitor core II (9) are wrapped with an insulating protective film (8).

6. The DC-Link capacitor capable of monitoring internal temperature according to claim 1, characterized in that: The upper connecting core bar I (4), the lower connecting core bar I (5), the upper connecting core bar II (6) and the lower connecting core bar II (7) are made of copper bars.

7. The DC-Link capacitor capable of monitoring internal temperature according to claim 1, characterized in that: Capacitor core I (3) and capacitor core II (9) are DC-Link capacitors.

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