CN212934405U

CN212934405U - Metallized polypropylene film capacitor for protecting IGBT module of frequency converter

Info

Publication number: CN212934405U
Application number: CN202021925573.2U
Authority: CN
Inventors: 李新安; 李骁
Original assignee: Shenzhen Shenfeng Electronics Co ltd
Current assignee: Shenzhen Shenfeng Electronics Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2021-04-09
Anticipated expiration: 2030-09-07

Abstract

The utility model discloses a metallized polypropylene film capacitor for protecting an IGBT module of a frequency converter, which comprises a metallized polypropylene film capacitor main body, a heat dissipation device, a shell and a sleeve; the bottom of the metalized polypropylene film capacitor body is provided with pins, the outer surfaces of the pins are sleeved with sleeves, the two ends of each sleeve are fixedly connected with fixing seats, the outer surface of the metalized polypropylene film capacitor body is sleeved with a heat dissipation device, the two sides of the heat dissipation device are fixedly connected with a shell through connecting rods, and the bottom of the shell is fixedly provided with a fixing bolt. The utility model discloses install heat abstractor, when impressed voltage was enough high, the metallization polypropylene film capacitor shifted to unbalanced state from the heat dissipation balanced state, and heat abstractor plays a role this moment, and heat conduction cover absorption capacitor's heat transfer is to on a plurality of radiating fin on surface, then radiating fin through the area of contact of increase with the air with more heat effluvium, guarantees the normal use of condenser.

Description

Metallized polypropylene film capacitor for protecting IGBT module of frequency converter

Technical Field

The utility model relates to a condenser technical field specifically is a metallization polypropylene film capacitor of protection converter IGBT module.

Background

The capacitor plays a role in filtering, and is used for reducing the voltage wave of the output voltage of the rectifying circuit to the minimum and providing pure direct current voltage for the subsequent inverter so as to reduce the waveform distortion of the alternating current voltage output by the inverter, the capacitor is flat wave, the capacitors sharing a direct current bus are generally connected in parallel and used for energy storage and filtering, and in the protection of an IGBT module of the frequency converter, a metallized polypropylene film capacitor is commonly used.

The existing metallized polypropylene film capacitor for protecting the IGBT module of the frequency converter has the following defects:

1. the existing metallized polypropylene film capacitor for protecting the IGBT module of the frequency converter is not provided with a pin protection device, and the connecting part of a pin and the main body of the metallized polypropylene film capacitor and the welding part of the outer end of the pin are easily broken due to repeated bending in the transportation process and after the metallized polypropylene film capacitor is connected on a circuit board.

2. The metallized polypropylene film capacitor for protecting the IGBT module of the frequency converter is not provided with a heat dissipation device, and when the applied voltage is high enough, the metallized polypropylene film capacitor is switched into an unbalanced state from a heating balanced state to cause the damage of the capacitor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a metallization polypropylene film capacitor of protection converter IGBT module to solve the problem that provides among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a metallized polypropylene film capacitor for protecting an IGBT module of a frequency converter comprises a metallized polypropylene film capacitor main body, a heat dissipation device, a shell and a sleeve; the bottom of the metalized polypropylene film capacitor body is provided with pins, the outer surfaces of the pins are sleeved with sleeves, the two ends of each sleeve are fixedly connected with fixing seats, the outer surface of the metalized polypropylene film capacitor body is sleeved with a heat dissipation device, the two sides of the heat dissipation device are fixedly connected with a shell through connecting rods, and the bottom of the shell is fixedly provided with a fixing bolt.

Preferably, the lower end of the fixing seat is fixedly provided with a protective layer, and the central position of the protective layer is provided with an electricity measuring port.

Preferably, the heat dissipation device comprises a heat conduction sleeve and heat dissipation fins, and the heat dissipation fins are arranged on the outer surface of the heat conduction sleeve at equal intervals.

Preferably, the two sides of the shell are provided with heat dissipation ports, and four corners of the bottom of the shell are fixedly provided with support rods.

Preferably, the sleeve comprises a main pipe and branch pipes, and the branch pipes are fixedly connected to two ends of the main pipe.

Preferably, the bottom end of the fixing bolt is fixedly provided with a limiting sleeve, and the bottom of the limiting sleeve is embedded with a rubber sleeve.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses be equipped with sleeve pipe and fixing base, after pin welded fastening, adjusting sleeve can make the fixing base top on sleeve pipe top in the junction of pin and metallization polypropylene film capacitor main part, and the fixing base top of sleeve pipe bottom protects the pin both ends at the welding department of pin, and the pipe box protects the pin surface simultaneously, prevents that the pin from breaking because of bending repeatedly to the life of condenser has been guaranteed.

2. The utility model discloses install heat abstractor, when impressed voltage is enough high, the metallization polypropylene film capacitor changes over to unbalanced state from the heat dissipation balanced state, and heat abstractor plays a role this moment, and heat conduction cover absorption capacitor's heat transfer to on a plurality of radiating fin on surface, then radiating fin is through the area of contact of increase with the air with more heat effluvium, has guaranteed the security of condenser when using, avoids breaking down because of the high temperature.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a top sectional view of the present invention;

fig. 3 is a schematic structural view of the heat dissipation device shown in fig. 1 according to the present invention;

fig. 4 is a schematic structural view of the casing of fig. 1 according to the present invention;

fig. 5 is a schematic structural view of the fixing base shown in fig. 1 of the present invention;

fig. 6 is a schematic structural view of the fixing bolt in fig. 1 of the present invention.

In the figure: 1. a metallized polypropylene film capacitor body; 2. a heat sink; 201. a heat conducting sleeve; 202. heat dissipation fins; 3. a housing; 301. a heat dissipation port; 302. a support bar; 4. a pin; 5. a sleeve; 501. a main pipe; 502. a branch pipe; 6. a fixed seat; 601. a protective layer; 602. testing an electric port; 7. a connecting rod; 8. fixing the bolt; 801. a limiting sleeve; 802. a rubber sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-6, the present invention provides an embodiment: a metallized polypropylene film capacitor for protecting an IGBT module of a frequency converter comprises a metallized polypropylene film capacitor main body 1, a heat dissipation device 2, a shell 3 and a sleeve 5; the bottom of the metallized polypropylene film capacitor body 1 is provided with pins 4 at two ends, the metallized polypropylene film capacitor body 1 is welded with a circuit board through the pins 4, the outer surface of each pin 4 is sleeved with a sleeve 5, two ends of each sleeve 5 are welded with fixing seats 6, after the pins 4 are welded and fixed, the length of each sleeve 5 is adjusted to enable the fixing seat 6 at the top end of each sleeve 5 to be abutted against the connecting part of each pin 4 and the metallized polypropylene film capacitor body 1, the fixing seat 6 at the bottom end of each sleeve 5 is abutted against the welding part of each pin 4 to protect two ends of each pin 4, the outer surface of the metallized polypropylene film capacitor body 1 is sleeved with a heat dissipation device 2, when the metallized polypropylene film capacitor body 1 works, heat generated by the metallized polypropylene film capacitor body 1 is absorbed by the heat dissipation device 2 and then dissipated to the outside, and the phenomenon that the metallized polypropylene film capacitor body, the both sides of heat abstractor 2 have shell 3 through the welding of connecting rod 7, and shell 3 plays the guard action to metallization polypropylene film capacitor main part 1, and there is fixing bolt 8 shell 3's bottom through helicitic texture fixed mounting, and fixing bolt 8 is convenient for to shell 3's fixed.

Further, the lower end of the fixing seat 6 is welded with a protection layer 601, a power measuring port 602 is arranged at the central position of the protection layer 601, when the fixing seat 6 is pushed against the metallized polypropylene film capacitor main body 1 and the circuit board, the fixing seat 6 is in surface contact with the metallized polypropylene film capacitor main body 1 and the circuit board through the protection layer 601, damage to the surface contact of the metallized polypropylene film capacitor main body 1 and the circuit board caused by direct surface contact of the fixing seat 6 with the metallized polypropylene film capacitor main body 1 and the circuit board is avoided, and the power measuring port 602 is convenient for personnel to detect voltages at two ends of the pin 4.

Further, the heat dissipation device 2 includes a heat conduction sleeve 201 and heat dissipation fins 202, the heat dissipation fins 202 are arranged on the outer surface of the heat conduction sleeve 201 at equal intervals, the heat conduction sleeve 201 absorbs the heat of the metallized polypropylene film capacitor main body 1 and then transfers the heat to the heat dissipation fins 202, and then the heat dissipation fins 202 quickly dissipate the heat, so as to ensure the normal operation of the metallized polypropylene film capacitor main body 1.

Further, the both sides of shell 3 are equipped with thermovent 301, and there are bracing piece 302 at four angles of shell 3 bottom through helicitic texture fixed mounting, and thermovent 301 is convenient for heat abstractor 2's heat dissipation, and fixing bolt 8 installs in the bottom of bracing piece 302, and shell 3 is fixed through bracing piece 302 and external contact.

Further, the sleeve 5 comprises a main pipe 501 and branch pipes 502, the branch pipes 502 are fixedly connected to two ends of the main pipe 501 through a threaded structure, and the overall length of the sleeve 5 can be adjusted by screwing the branch pipes 502 at two ends of the main pipe 501, so that the sleeve 5 can completely cover the pins 4.

Further, the bottom welding of fixing bolt 8 has stop collar 801, and rubber sleeve 802 is inlayed to the bottom of stop collar 801, and rubber sleeve 802 can cushion vibrations, avoids leading to fixing bolt 8 to appear the not hard up phenomenon of installation under external vibrations.

The working principle is as follows: when the device is used, after the pins 4 are welded and fixed, a person screws the branch pipes 502 at the two ends of the main pipe 501 to adjust the overall length of the sleeve 5, so that the fixing seat 6 at the top end of the sleeve 5 is abutted to the joint of the pins 4 and the metallized polypropylene film capacitor main body 1, the fixing seat 6 at the bottom end of the sleeve 5 is abutted to the welding position of the pins 4 to protect the two ends of the pins 4, the sleeve 5 protects the surfaces of the pins 4 to prevent the pins 4 from being broken due to repeated bending, then the person screws the support rod 302 to abut on the circuit board, screws the fixing bolt 8 to fix, the heat dissipation device 2 is sleeved on the outer surface of the metallized polypropylene film capacitor main body 1, when the applied voltage is high enough, the metallized polypropylene film capacitor main body 1 is switched from a heat dissipation balanced state to an unbalanced state, at the moment, the heat dissipation device 2 plays a role, the heat conduction sleeve 201 absorbs the heat, then transferred to the surface heat dissipation fins 202, and then the heat dissipation fins 202 quickly dissipate the heat, thereby ensuring the normal use of the capacitor.

The details of the present invention are well known to those skilled in the art.

Finally, it is to be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified and replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims

1. A metallized polypropylene film capacitor for protecting an IGBT module of a frequency converter is characterized in that: comprises a metallized polypropylene film capacitor main body (1), a heat dissipation device (2), a shell (3) and a sleeve (5); the metallized polypropylene film capacitor is characterized in that pins (4) are arranged at two ends of the bottom of the metallized polypropylene film capacitor body (1), a sleeve (5) is sleeved on the outer surface of each pin (4), fixing seats (6) are fixedly connected to two ends of the sleeve (5), a heat dissipation device (2) is sleeved on the outer surface of the metallized polypropylene film capacitor body (1), a connecting rod (7) is fixedly connected to two sides of the heat dissipation device (2), and a fixing bolt (8) is fixedly mounted at the bottom end of the shell (3).

2. The metallized polypropylene film capacitor for protecting an IGBT module of a frequency converter according to claim 1, characterized in that: the lower extreme fixed mounting of fixing base (6) has protective layer (601), and the central point department of protective layer (601) is equipped with surveys electric mouth (602).

3. The metallized polypropylene film capacitor for protecting an IGBT module of a frequency converter according to claim 1, characterized in that: the heat dissipation device (2) comprises a heat conduction sleeve (201) and heat dissipation fins (202), wherein the heat dissipation fins (202) with equal intervals are arranged on the outer surface of the heat conduction sleeve (201).

4. The metallized polypropylene film capacitor for protecting an IGBT module of a frequency converter according to claim 1, characterized in that: the both sides of shell (3) are equipped with thermovent (301), four angles fixed mounting in shell (3) bottom have bracing piece (302).

5. The metallized polypropylene film capacitor for protecting an IGBT module of a frequency converter according to claim 1, characterized in that: the sleeve (5) comprises a main pipe (501) and branch pipes (502), and the branch pipes (502) are fixedly connected to two ends of the main pipe (501).

6. The metallized polypropylene film capacitor for protecting an IGBT module of a frequency converter according to claim 1, characterized in that: the bottom end of the fixing bolt (8) is fixedly provided with a limiting sleeve (801), and a rubber sleeve (802) is embedded in the bottom of the limiting sleeve (801).