Heat dissipation and sealing structure of a chopping cell

Abstract

This utility model discloses a heat dissipation and sealing structure for a chopper unit, including a chopper unit, a radiator, a chassis, and a sealing assembly. The chassis includes a unit mounting cavity and a radiator mounting cavity, with the radiator mounting cavity connected to the unit mounting cavity via a connecting port. The radiator is mounted on the chopper unit, which is located within the unit mounting cavity. The heat dissipation end of the radiator extends into the radiator mounting cavity through the connecting port, and the connecting port is sealed to the chopper unit via the sealing assembly. The radiator mounting cavity has an air inlet and an air outlet connecting to the outside of the chassis. This utility model achieves sealing by using a sealing assembly, allowing the chopper unit to be mounted within the unit mounting cavity and the radiator's heat dissipation end to extend into the radiator mounting cavity through the connecting port. It also allows the radiator's heat dissipation end to be located on the outside of the radiator mounting cavity for heat dissipation, ensuring the unit mounting cavity meets the required sealing level. This avoids complex heat dissipation structures, resulting in a simpler overall structure and smaller footprint.

Description

Technical Field

[0001] This utility model relates to the field of electrical enclosure technology, and in particular to a heat dissipation and sealing structure for a chopper unit. Background Technology

[0002] A chopper, also known as a chopper unit, is a crucial power electronic device in electric locomotives. Its main function is to convert a constant DC voltage into an adjustable DC voltage, enabling precise regulation and control of the DC voltage. The chopper unit operates based on the rapid switching action of power semiconductor devices (such as insulated-gate bipolar transistors, IGBTs). By periodically controlling the on / off state of the DC power supply, the required voltage is output through a filter circuit.

[0003] Currently, the chopper unit is installed inside the chassis. Because the chassis must meet an IP54 sealing rating, a complex heat dissipation structure is required to meet the cooling requirements. This increases the overall size and cost of the device. Therefore, there is a need to design a heat dissipation and sealing structure for the unit that is simpler in structure and occupies less space. Utility Model Content

[0004] This invention provides a heat dissipation and sealing structure for a chopper unit to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A heat dissipation and sealing structure for a chopper unit includes: a chopper unit, a heat sink, a chassis, and a sealing assembly; the chassis includes a unit mounting cavity and a heat sink mounting cavity, the heat sink mounting cavity being connected to the unit mounting cavity via a connecting port; the heat sink is mounted on the chopper unit, the chopper unit is mounted inside the unit mounting cavity, the heat dissipation end of the heat sink extends into the heat sink mounting cavity through the connecting port, and the perimeter of the connecting port is sealed to the chopper unit via the sealing assembly; the heat sink mounting cavity has an air inlet and an air outlet connecting to the outside of the chassis.

[0007] Preferably, the chopper unit includes a first mounting flange, which corresponds to and is detachably connected to the four edges of the communication port.

[0008] Preferably, a second mounting flange is fixed on the side of the first mounting flange facing the communication port. The second mounting flange includes a sealing ring groove and a fixing part. The sealing ring groove is fixed on the first mounting flange, and the fixing part is fixed in the inner ring of the sealing ring groove. The radiator is detachably connected to the fixing part. The sealing assembly includes a sealing ring, which is installed in the sealing ring groove and is pressed against the perimeter of the communication port for sealing.

[0009] Preferably, a pressure plate is fixed around the connection port, and the pressure plate presses the sealing ring tightly.

[0010] Preferably, the pressure plate is a sheet metal bend, with the pressure plate perpendicular to the four edges of the connecting opening, and the edges of the pressure plate pressing against the sealing ring.

[0011] Preferably, a fixing post is fixed around the perimeter of the communication port, and the fixing post has a threaded hole. The first mounting flange is fixedly connected to the fixing post by screws.

[0012] Preferably, the inner wall of the radiator mounting cavity is provided with an air inlet blocking surface and an air outlet guiding surface. The air inlet blocking surface is inclined and faces the air inlet, and the air outlet guiding surface is inclined and faces the air outlet. The air inlet blocking surface and the air outlet guiding surface are arranged opposite to each other, and the heat dissipation end of the radiator is located between the air inlet blocking surface and the air outlet guiding surface.

[0013] Preferably, the inner wall shape of the air inlet matches the shape of the air intake blocking surface, and the air intake blocking surface extends to the inner wall of the air inlet; the inner wall shape of the air outlet matches the shape of the air outlet guiding surface, and the air outlet guiding surface extends to the inner wall of the air outlet.

[0014] Preferably, both the air inlet and the air outlet are equipped with louvered air vents.

[0015] Beneficial effects:

[0016] The heat dissipation and sealing structure of the chopper unit disclosed in this application achieves sealing between the communication port and the chopper unit by setting a sealing component, thereby enabling the chopper unit to be installed in the unit mounting cavity and the heat dissipation end of the radiator to pass through the communication port into the radiator mounting cavity; thus, the heat dissipation end of the radiator is arranged on the outside of the radiator mounting cavity for heat dissipation, and the unit mounting cavity is sealed to meet the sealing level, avoiding complex heat dissipation structures, making the overall structure simpler and occupying less space. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the heat dissipation and sealing structure of a chopper unit disclosed in this utility model;

[0019] Figure 2 This is a front view of the heat dissipation and sealing structure of a chopper unit disclosed in this utility model;

[0020] Figure 3 for Figure 2 Sectional view of AA;

[0021] Figure 4 for Figure 3 A magnified view of part B in the image.

[0022] 1. Chopper unit; 11. First mounting flange; 12. Second mounting flange; 121. Sealing ring groove; 122. Fixing part; 2. Radiator; 3. Chassis; 31. Unit mounting cavity; 32. Radiator mounting cavity; 321. Air inlet; 322. Air outlet; 323. Air inlet blocking surface; 324. Air outlet guide surface; 33. Connecting port; 331. Pressure plate; 332. Fixing column; 4. Sealing assembly. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] A heat dissipation and sealing structure for a chopper unit, combined with Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, it includes: a chopper unit 1, a heat sink 2, a chassis 3, and a sealing assembly 4; the chassis 3 includes a unit mounting cavity 31 and a heat sink mounting cavity 32, the heat sink mounting cavity 32 being connected to the unit mounting cavity 31 through a connecting port 33; the heat sink 2 is mounted on the chopper unit 1, the chopper unit 1 is mounted inside the unit mounting cavity 31, the heat dissipation end of the heat sink 2 passes through the connecting port 33 into the heat sink mounting cavity 32, and the periphery of the connecting port 33 is sealed to the chopper unit 1 through the sealing assembly 4; the heat sink mounting cavity 32 has an air inlet 321 and an air outlet 322 connecting to the outside of the chassis 3. This application achieves a seal between the chopper unit 1 and the surrounding area of ​​the connecting port 33 by setting a sealing component 4, thereby enabling the chopper unit 1 to be installed in the unit mounting cavity 31 and the heat dissipation end of the radiator 2 to pass through the connecting port 33 into the radiator mounting cavity 32; thus, the heat dissipation end of the radiator 2 is arranged on the outside of the radiator mounting cavity 32 for heat dissipation, and the unit mounting cavity 31 is sealed to meet the sealing level, avoiding a complex heat dissipation structure, making the overall structure simpler and occupying less space.

[0025] Preferably, the chopper unit 1 includes a first mounting flange 11, which corresponds to and is detachably connected to the periphery of the communication port 33, so that the chopper unit 1 can be mounted on the chassis 3, and the chopper unit 1 covers a ring around the communication port 33 to facilitate the installation of the sealing assembly 4.

[0026] Preferably, a second mounting flange 12 is fixed to the side of the first mounting flange 11 facing the connection port 33. The second mounting flange 12 includes a sealing ring groove 121 and a fixing part 122. The sealing ring groove 121 is fixed to the first mounting flange 11, and the fixing part 122 is fixed to the inner ring of the sealing ring groove 121. The radiator 2 is detachably connected to the fixing part 122. The sealing assembly 4 includes a sealing ring, which is installed in the sealing ring groove 121 and pressed against the periphery of the connection port 33 for sealing. The radiator 2 itself meets the safety level requirements, thereby achieving a seal between the chopper unit 1 and the periphery of the connection port 33, ensuring that the connection meets the standard requirements.

[0027] Specifically, both the first mounting flange 11 and the second mounting flange 12 are sheet metal parts. The sealing ring groove 121 has a "U" shaped cross-section and a sealing ring is inserted inside it. The second mounting flange 12 is welded and fixed to the first mounting flange 11, and the fixing part 122 extends to the position inside the corresponding communication port 33 to facilitate the installation of the radiator 2.

[0028] Preferably, a pressure plate 331 is fixed around the connection port 33, and the pressure plate 331 presses the sealing ring to improve the sealing effect.

[0029] Preferably, the pressure plate 331 is a sheet metal bend, and the pressure plate 331 is perpendicular to the four edges of the connecting port 33. The edge of the pressure plate 331 presses against the sealing ring, so that the pressure plate 331 compresses the sealing ring by about 3mm, thereby further improving the sealing effect.

[0030] Preferably, a fixing post 332 is fixedly welded to the periphery of the connecting port 33. The fixing post 332 has threaded holes. The first mounting flange 11 is fixedly connected to the fixing post 332 by screws, so that the first mounting flange 11 is connected to the periphery of the connecting port 33, and a gap is left for placing the second mounting flange 12. After the screws are tightened on the fixing post 332, the edge of the pressure plate 331 presses the sealing ring.

[0031] Preferably, the inner wall of the radiator mounting cavity 32 is provided with an air inlet blocking surface 323 and an air outlet guiding surface 324. The air inlet blocking surface 323 is inclined and faces the air inlet 321, and the air outlet guiding surface 324 is inclined and faces the air outlet 322. The air inlet blocking surface 323 and the air outlet guiding surface 324 are arranged opposite to each other, and the heat dissipation end of the radiator 2 is located between the air inlet blocking surface 323 and the air outlet guiding surface 324. After the air enters from the air inlet 321, the airflow direction is changed due to the blocking and guiding effect of the air inlet blocking surface 323. The airflow flows through the fins of the heat dissipation end of the radiator 2, carrying away the heat on them. After contacting the air outlet guiding surface 324, the airflow is guided to the air outlet 322 and flows out.

[0032] Preferably, the inner wall shape of the air inlet 321 matches the shape of the air intake obstruction surface 323, and the air intake obstruction surface 323 extends to the inner wall of the air inlet 321; the inner wall shape of the air outlet 322 matches the shape of the air outlet guide surface 324, and the air outlet guide surface 324 extends to the inner wall of the air outlet 322; thus ensuring that there is no obstruction at the positions of the air inlet 321 and the air outlet 322, allowing air to flow smoothly and quickly into and out of the radiator mounting cavity 32.

[0033] Specifically, the air inlet 321 and the air outlet 322 are both rectangular in shape, and the air intake obstruction surface 323 and the air outlet guide surface 324 are both planar in shape. The air intake obstruction surface 323 extends to the inner wall of the air inlet 321 away from the air outlet 322, and the air intake obstruction surface 323 coincides with the inner wall. The air outlet guide surface 324 extends to the inner wall of the air outlet 322 away from the air inlet 321, and the air outlet guide surface 324 coincides with the inner wall. This ensures that the airflow is smoothly transitioned when flowing through the air inlet 321 and the air intake obstruction surface 323, the air outlet guide surface 324 and the air outlet 322. It is understandable that if both the air inlet 321 and the air outlet 322 are circular, the cross-sections of the air intake blocking surface 323 and the air outlet guiding surface 324 along the gas flow direction are arc-shaped, so that the air intake blocking surface 323 can coincide with the inner wall of the air inlet 321, and the air outlet guiding surface 324 can coincide with the inner side wall of the air outlet 322, thereby achieving a smooth transition.

[0034] Preferably, both the air inlet 321 and the air outlet 322 are equipped with louvered air vents to block foreign objects.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A heat dissipation and sealing structure for a chopper unit, characterized in that, include: The components include a chopper unit (1), a radiator (2), a chassis (3), and a sealing assembly (4). The chassis (3) includes a unit mounting cavity (31) and a radiator mounting cavity (32). The radiator mounting cavity (32) is connected to the unit mounting cavity (31) through a connecting port (33). The radiator (2) is mounted on the chopper unit (1). The chopper unit (1) is mounted inside the unit mounting cavity (31). The heat dissipation end of the radiator (2) passes through the connecting port (33) into the radiator mounting cavity (32). The connecting port (33) is sealed to the chopper unit (1) through the sealing assembly (4). The radiator mounting cavity (32) has an air inlet (321) and an air outlet (322) that connect to the outside of the chassis (3).

2. The heat dissipation and sealing structure of the chopper unit according to claim 1, characterized in that, The chopper unit (1) includes a first mounting flange (11), which corresponds to and is detachably connected to the periphery of the communication port (33).

3. The heat dissipation and sealing structure of the chopper unit according to claim 2, characterized in that, A second mounting flange (12) is fixed on the side of the first mounting flange (11) facing the communication port (33). The second mounting flange (12) includes a sealing ring groove (121) and a fixing part (122). The sealing ring groove (121) is fixed on the first mounting flange (11), and the fixing part (122) is fixed in the inner ring of the sealing ring groove (121). The radiator (2) is detachably connected to the fixing part (122). The sealing assembly (4) includes a sealing ring. The sealing ring is installed in the sealing ring groove (121), and the sealing ring is pressed against the periphery of the communication port (33) for sealing.

4. The heat dissipation and sealing structure of the chopper unit according to claim 3, characterized in that, A pressure plate (331) is fixed around the communication port (33), and the pressure plate (331) presses the sealing ring.

5. The heat dissipation and sealing structure of the chopper unit according to claim 4, characterized in that, The pressure plate (331) is a sheet metal bend, the pressure plate (331) is perpendicular to the periphery of the connecting port (33), and the edge of the pressure plate (331) presses against the sealing ring.

6. The heat dissipation and sealing structure of the chopper unit according to claim 5, characterized in that, The four edges of the connecting port (33) are fixed with a fixing post (332), and the fixing post (332) has a threaded hole. The first mounting flange (11) is fixedly connected to the fixing post (332) by screws.

7. The heat dissipation and sealing structure of the chopper unit according to claim 1, characterized in that, The inner wall of the radiator mounting cavity (32) is provided with an air inlet blocking surface (323) and an air outlet guiding surface (324). The air inlet blocking surface (323) is inclined and faces the air inlet (321), and the air outlet guiding surface (324) is inclined and faces the air outlet (322). The air inlet blocking surface (323) and the air outlet guiding surface (324) are arranged opposite to each other, and the heat dissipation end of the radiator (2) is located between the air inlet blocking surface (323) and the air outlet guiding surface (324).

8. The heat dissipation and sealing structure of the chopper unit according to claim 7, characterized in that, The inner wall shape of the air inlet (321) matches the shape of the air intake blocking surface (323), which extends to the inner wall of the air inlet (321); the inner wall shape of the air outlet (322) matches the shape of the air outlet guide surface (324), which extends to the inner wall of the air outlet (322).

9. A heat dissipation and sealing structure for a chopper unit according to any one of claims 1 or 7-8, characterized in that, Both the air inlet (321) and the air outlet (322) are equipped with louvered air vents.

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