Three-phase PWM rectifier

Abstract

The utility model relates to the technical field of rectifiers, in particular to a three-phase PWM (Pulse Width Modulation) rectifier, which comprises a substrate, a shell arranged at the top of the substrate, a cooling plate arranged at the middle position of the substrate and positioned below the shell, and an S-shaped flow channel arranged inside the cooling plate, the bottom of the cooling plate is fixedly connected with two liquid inlet and outlet pipes communicated with the two ends of the flowing channel respectively, a plurality of fins arranged in order are fixedly installed on the two sides of the shell, an S-shaped spiral cooling pipe is inserted between the fins on the two sides of the shell in a penetrating mode, and the two ends of the cooling pipe penetrate through the base plate. The heat dissipation efficiency of the fins can be improved through cooling liquid flowing in the cooling pipes, heat in the shell can be rapidly taken away when the cooling liquid flows in the flowing channels in the cooling plates, and the heat dissipation efficiency of the fins can be improved through the cooperation of the cooling fan and the fins. Therefore, heat in the shell can be efficiently dissipated.

Description

Technical Field

[0001] This utility model relates to the field of rectifier technology, and in particular to a three-phase PWM rectifier. Background Technology

[0002] A three-phase PWM rectifier is a high-performance rectifier based on pulse width modulation (PWM) technology. It is mainly used to convert three-phase AC power into DC power, while achieving high power factor, low harmonic pollution, and bidirectional energy flow. The three-phase PWM rectifier has advantages such as power factor correction, low current harmonics, and high conversion efficiency. The positive sequence component extractor can extract the positive sequence component in the power grid and eliminate harmonics, which serves as the reference phase for the inductor current, effectively suppressing power grid disturbances. Furthermore, high-precision current tracking is achieved through model predictive control.

[0003] Because of the use of PWM control technology, the switching devices will frequently turn on and off, which will cause the switching devices to heat up. In addition, the operation of the internal components of the device will also generate heat. Traditional rectifiers mostly use natural heat dissipation, which improves heat dissipation efficiency by installing fins on the device casing. However, the effect of this heat dissipation method is limited and cannot quickly remove the heat inside the device, resulting in the rectifier being prone to a high temperature. In order to achieve efficient heat dissipation of the rectifier, this application proposes a three-phase PWM rectifier. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a three-phase PWM rectifier to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: A three-phase PWM rectifier includes a base plate, a shell mounted on the top of the base plate, a cooling plate mounted in the middle of the base plate below the shell, an S-shaped flow channel inside the cooling plate, two inlet and outlet pipes respectively connected to the two ends of the flow channel fixedly connected to the bottom of the cooling plate, several neatly arranged fins fixedly mounted on both sides of the shell, and an S-shaped spiral cooling pipe inserted between the fins on both sides of the shell, both ends of the cooling pipe penetrating the base plate, and a connecting pipe connected to the inlet and outlet pipes fixedly connected to both ends of the cooling pipe, an opening opened at the right end of the shell, a cooling fan installed at the opening, and a heat dissipation vent opened on the left side of the shell, with a removable dustproof plate at the heat dissipation vent.

[0006] Optionally, the cooling plate, fins, and cooling pipes are all made of aluminum. The flow rate of the inlet and outlet pipes is greater than the flow rate of the internal flow channel of the cooling plate. The part of the cooling pipe that connects to both sides of the outer shell passes through the inside of the outer shell.

[0007] Optionally, a slot is provided on the left side of the casing, with heat dissipation vents evenly distributed in the slot. A flip-up dustproof plate is installed in the slot, with a dustproof mesh in the middle of the dustproof plate. Multiple bolts that are threaded to the outer wall of the casing are inserted at the edge of the cooling fan.

[0008] Optionally, a notch is provided at the center of the bottom of the plate groove, and a rotatable rotating block is provided in the notch. A rod shaft is installed on both sides of the rotating block and is rotatably inserted into the inner wall of the notch. A connecting groove is provided at the top of the rotating block. A connecting block that can be inserted into the connecting groove is fixedly installed at the bottom of the dustproof plate. Limiting components that engage with the dustproof plate are provided at the top of both sides of the plate groove.

[0009] Optionally, the limiting component includes a locking block and a spring. Grooves are provided at the top of both sides of the plate groove. The locking block is movably inserted into the groove. The spring is fixedly connected between the locking block and the inner wall of the groove. The top of both sides of the dustproof plate is provided with a locking groove. The end of the locking block that extends out of the groove is set as a ball, and the ball end of the locking block can be engaged in the locking groove on the side of the dustproof plate.

[0010] Optionally, L-shaped mounting brackets are fixedly installed at both ends of the bottom of the substrate, and mounting holes are provided at both ends of the horizontal section of the mounting brackets.

[0011] The beneficial effects of this utility model are:

[0012] The S-shaped flow channel inside the cooling plate and the S-shaped cooling pipes between the fins on both sides of the outer shell form a three-dimensional heat dissipation network. The coolant flows into the flow channel and the cooling pipe through the inlet and outlet pipes respectively. The former directly carries away the heat from the bottom of the outer shell, while the latter fully contacts the fins through the spiral path and quickly absorbs the heat from the fins. This significantly improves the heat dissipation efficiency compared to the traditional single-fin heat dissipation method. The cooling fan at the opening on the right side of the outer shell actively draws in the internal hot air, and the cooling vent on the left side cooperates with the air intake to form forced convection, which accelerates the heat dissipation. Compared with the traditional heat dissipation method, it has a more effective heat dissipation effect. Attached Figure Description

[0013] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a structural schematic diagram of the present invention viewed from below;

[0016] Figure 3 This is a schematic diagram of the structure of the outer shell of this utility model;

[0017] Figure 4 This is a schematic diagram of the connection between the substrate and the cooling plate of this utility model;

[0018] Figure 5 This is a schematic diagram of the connection between the dustproof plate and the outer shell of this utility model;

[0019] Figure 6 This is an enlarged structural diagram of point A in this utility model;

[0020] In the diagram: 1. Substrate; 2. Outer shell; 3. Cooling plate; 4. Flow channel; 5. Inlet / outlet pipe; 7. Fin; 8. Cooling pipe; 9. Connecting pipe; 10. Mounting bracket; 11. Port; 12. Cooling fan; 13. Plate groove; 14. Heat dissipation vent; 15. Dustproof plate; 16. Notch; 17. Rotating block; 18. Connecting block; 19. Locking block; 20. Spring. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] Please see Figures 1-6 This utility model provides a technical solution: a three-phase PWM rectifier, including a substrate 1, a shell 2 mounted on the top of the substrate 1, a cooling plate 3 mounted in the middle of the substrate 1 below the shell 2, an S-shaped flow channel 4 inside the cooling plate 3, two inlet and outlet pipes 5 fixedly connected to the bottom of the cooling plate 3 respectively communicating with the two ends of the flow channel 4, several neatly arranged fins 7 fixedly mounted on both sides of the shell 2, and S-shaped spiral cooling pipes 8 inserted between the fins 7 on both sides of the shell 2, the cooling pipes 8 being fixed or welded to the fins 7 with thermally conductive adhesive, and both ends of the cooling pipes 8 penetrating the substrate 1. Both ends of the cooling pipe 8 are fixedly connected to a connecting pipe 9 that communicates with the inlet and outlet pipes 5. The right end of the outer casing 2 has an opening 11, and a cooling fan 12 is installed at the opening 11. The left side of the outer casing 2 has a heat dissipation port 14, and a removable dustproof plate 15 is provided at the heat dissipation port 14. By injecting coolant into the inlet and outlet pipes 5, the coolant flows in the flow channel 4 in the cooling plate 3 and in the cooling pipe 8. The coolant flowing in the flow channel 4 can remove the heat from the bottom of the inner cavity of the outer casing 2, while the coolant flowing in the cooling pipe 8 can remove the heat from each fin 7. Combined with the cooling fan 12 on the right side of the outer casing 2, the device can achieve efficient heat dissipation.

[0023] like Figure 1 , Figure 2 and Figure 4As shown, the cooling plate 3, fins 7, and cooling pipe 8 are all made of aluminum. The flow rate of the inlet and outlet pipe 5 is greater than the flow rate of the internal flow channel 4 of the cooling plate 3. The part of the cooling pipe 8 that connects to both sides of the outer shell 2 passes through the inside of the outer shell 2. The cooling plate 3, fins 7, and cooling pipe 8 all have good thermal conductivity, which can quickly complete the transfer and dissipation of heat. The coolant flows by natural convection. The buoyancy generated by the density change of the coolant after heating drives the flow. The hot coolant flows upward due to the decrease in density, and the cold coolant sinks to replenish it, forming a natural circulation. Part of the coolant flowing inside the inlet and outlet pipe 5 flows into the flow channel 4 in the cooling plate 3, and the other part enters the cooling pipe 8 through the connecting pipe 9. When the coolant in the cooling pipe 8 flows, it can carry the heat on the fins 7, thereby accelerating the dissipation of heat on the fins 7. The combination of the two can greatly improve the heat dissipation effect on the outer shell 2, while the flow of the coolant inside the cooling plate 3 can carry away the heat at the bottom of the outer shell 2.

[0024] like Figure 2 and Figure 3 As shown, a slot 13 is provided on the left side of the outer casing 2, and heat dissipation vents 14 are evenly distributed in the slot 13. A flip-up dustproof plate 15 is provided in the slot 13, and a dustproof mesh is provided in the middle of the dustproof plate 15. Multiple bolts that are threaded to the outer wall of the outer casing 2 are inserted at the edge of the cooling fan 12. The heat dissipation vents 14 can not only exhaust the heat inside the outer casing 2, but also allow outside air to enter the interior of the outer casing 2 through the heat dissipation vents 14. Together with the cooling fan 12, the air circulation inside the outer casing 2 can be realized.

[0025] like Figure 5 and Figure 6 As shown, a notch 16 is provided at the center of the bottom of the plate groove 13. A rotatable rotating block 17 is provided in the notch 16. Rod shafts that are rotatably inserted into the inner walls of the notch 16 are installed on both sides of the rotating block 17. A connecting groove is provided at the top of the rotating block 17. A connecting block 18 that can be inserted into the connecting groove is fixedly installed at the bottom of the dustproof plate 15. Limiting components that engage with the dustproof plate 15 are provided at the top of both sides of the plate groove 13. By inserting the connecting block 18 into the connecting groove at the top of the rotating block 17, the bottom end of the dustproof plate 15 can be constrained, thereby further improving the stability of the dustproof plate 15 installed in the plate groove 13.

[0026] like Figure 5 and Figure 6As shown, the limiting assembly includes a locking block 19 and a spring 20. Grooves are provided at the top of both sides of the plate groove 13. The locking block 19 is movably inserted into the groove, and the spring 20 is fixedly connected between the locking block 19 and the inner wall of the groove. Slots are provided at the top of both sides of the dustproof plate 15. One end of the locking block 19 extending out of the groove is spherical, and the spherical end of the locking block 19 can engage with the slot on the side of the dustproof plate 15. When the dustproof plate 15 is flipped into the plate groove 13, the two sides of the dustproof plate 15... The spring 20 will press the locking block 19 into the groove. When the locking block 19 is aligned with the groove, the spring 20 will release its elastic force to push the locking block 19 into the groove, thereby fixing the position of the dustproof plate 15 in the plate groove 13. This allows the dustproof mesh on the dustproof plate 15 to cover the heat dissipation vent 14. When removing the dustproof plate 15, it can be removed from the plate groove 13 simply by pushing it outward. The method of removing and installing the dustproof plate 15 is simple and convenient, making it easy to clean the dustproof plate 15 regularly in the future.

[0027] like Figure 1 and Figure 2 As shown, L-shaped mounting brackets 10 are fixedly installed at both ends of the bottom of the substrate 1. Mounting holes are provided at both ends of the horizontal section of the mounting bracket 10. The mounting bracket 10 can support the substrate 1, preventing the bottom of the substrate 1 from contacting the mounting plate, thereby reserving heat dissipation space for the bottom of the substrate 1.

[0028] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A three-phase PWM rectifier, comprising a substrate (1), characterized in that, A shell (2) is mounted on the top of the substrate (1). A cooling plate (3) is mounted in the middle of the substrate (1) and located below the shell (2). An S-shaped flow channel (4) is opened inside the cooling plate (3). Two liquid inlet and outlet pipes (5) are fixedly connected to the bottom of the cooling plate (3) and are respectively connected to the two ends of the flow channel (4). Several neatly arranged fins (7) are fixedly mounted on both sides of the shell (2). (7) A cooling pipe (8) in an S-shape is inserted through the middle. Both ends of the cooling pipe (8) penetrate the base plate (1). Both ends of the cooling pipe (8) are fixedly connected to a connecting pipe (9) that communicates with the inlet and outlet pipes (5). The right end of the outer shell (2) is provided with an opening (11). A cooling fan (12) is installed at the opening (11). The left side of the outer shell (2) is provided with a heat dissipation port (14). A removable dustproof plate (15) is provided at the heat dissipation port (14).

2. A three-phase PWM rectifier according to claim 1, characterized in that, The cooling plate (3), fins (7) and cooling pipe (8) are all made of aluminum. The flow rate of the inlet and outlet pipe (5) is greater than the flow rate of the internal flow channel (4) of the cooling plate (3). The part of the cooling pipe (8) that connects to both sides of the outer shell (2) passes through the inside of the outer shell (2).

3. A three-phase PWM rectifier according to claim 1, characterized in that, The outer casing (2) has a slot (13) on the left side, and the heat dissipation vents (14) are evenly distributed in the slot (13). A reversible dustproof plate (15) is provided in the slot (13), and a dustproof mesh is provided in the middle of the dustproof plate (15). Multiple bolts that are threaded to the outer wall of the outer casing (2) are inserted at the edge of the heat dissipation fan (12).

4. A three-phase PWM rectifier according to claim 3, characterized in that, A notch (16) is provided at the center of the bottom of the plate groove (13). A rotatable rotating block (17) is provided in the notch (16). A rod shaft is installed on both sides of the rotating block (17) and is rotatably inserted into the inner wall of the notch (16). A connecting groove is provided at the top of the rotating block (17). A connecting block (18) that can be inserted into the connecting groove is fixedly installed at the bottom of the dustproof plate (15). A limiting component that engages with the dustproof plate (15) is provided at the top of both sides of the plate groove (13).

5. A three-phase PWM rectifier according to claim 4, characterized in that, The limiting component includes a locking block (19) and a spring (20). Grooves are provided at the top of both sides of the plate groove (13). The locking block (19) is movably inserted into the groove. The spring (20) is fixedly connected between the locking block (19) and the inner wall of the groove. The top of both sides of the dustproof plate (15) is provided with a slot. One end of the locking block (19) extending out of the groove is set as a sphere, and the spherical end of the locking block (19) can be engaged in the slot on the side of the dustproof plate (15).

6. A three-phase PWM rectifier according to claim 1, characterized in that, Both ends of the bottom of the substrate (1) are fixedly mounted with L-shaped mounting brackets (10), and mounting holes are provided at both ends of the horizontal and vertical parts of the mounting brackets (10).

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