Efficient air-cooled heat dissipation frequency converter

Abstract

The frequency converter comprises a frequency converter body, a heat dissipation substrate is arranged in an upper box body of the frequency converter body, cold air heat dissipation mechanisms are symmetrically arranged on the edge of the bottom of the heat dissipation substrate, and a surge protector, a rectifier bridge, a driving board, a power module and a driver are arranged on a front PCB main board of the heat dissipation substrate. According to the frequency converter, a method of combining a condenser pipe and a fan is adopted, the temperature of air around the cold air heat dissipation mechanism is rapidly reduced, the cold air heat dissipation mechanism pushes cooled cold air flow into the box body, the cold air flow is cooled, and the temperature of the cold air flow is reduced. According to the cooling device for the parts, the parts in the box body are rapidly cooled, hot airflow in the box body is discharged through airflow subjected to cold and heat transfer under the action of the auxiliary cooling box 33, in this way, cold airflow and the heating parts are continuously adopted for cold and heat transfer, and the cooled cold air is good in cooling effect and better in cooling stability.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency converters, and particularly to a frequency converter with efficient air-cooled heat dissipation. Background Art

[0002] A frequency converter is a power control device that applies frequency conversion technology and microelectronics technology to control an alternating current motor by changing the frequency of the motor's working power supply.

[0003] The frequency converter mainly consists of rectification (AC to DC), filtering, inversion (DC to AC), braking unit, drive unit, detection unit, microprocessing unit, etc. The frequency converter adjusts the voltage and frequency of the output power supply by the on-off of the internal IGBT, provides the required power supply voltage according to the actual needs of the motor, and thus achieves the purpose of energy saving and speed regulation. In addition, the frequency converter also has many protection functions, such as overcurrent, overvoltage, overload protection, etc. With the continuous improvement of industrial automation, the frequency converter has also been widely used.

[0004] During the long-term use of the frequency converter, the temperature will gradually rise. At present, for the heat dissipation of the frequency converter, heat dissipation fans or oil-cooled circulation heat dissipation are generally adopted. The heat dissipation methods commonly used now will be affected by the external temperature, with unstable temperature reduction and unsatisfactory heat dissipation effect. Therefore, an improved technology is urgently needed to solve this problem existing in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a frequency converter with efficient air-cooled heat dissipation, in which a cold air heat dissipation mechanism pushes the cooled cold air flow into the interior of the box body to quickly cool the components inside the box body. The air flow after heat and cold transfer discharges the hot air flow inside the box body under the action of the auxiliary cooling box. By continuously using the cold air flow to conduct heat and cold transfer with the heat-generating components, the heat dissipation efficiency is greatly improved, so as to solve the problems put forward in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A frequency converter with efficient air-cooled heat dissipation, including a frequency converter body, a box body is provided on the frequency converter body, a heat dissipation substrate is provided inside the box body, cold air heat dissipation mechanisms are symmetrically provided at the bottom edge of the heat dissipation substrate, an external frame is provided on the cold air heat dissipation mechanism, both sides of the external frame are open, a fan is provided in the center of the internal part of the external frame, and condensation pipes and flow guide heat dissipation fins are equidistantly provided on both sides of the fan;

[0007] A PCB main board is provided on the front surface of the heat dissipation substrate, the PCB main board is fixedly installed with the back board of the box body, a surge protector, a rectifier bridge, a drive board, a power module, and a driver are provided on the PCB main board, and a DC contactor and a rectifier block are provided in cooperation on one side of the rectifier bridge;

[0008] Below the driving board, a plurality of inverters are cooperatively provided. Below the inverters, a wiring port slot is provided. The plurality of inverters are respectively connected to the wiring port slot below by conductive copper sheets in a cooperative manner;

[0009] On the front of the box body, a box door is provided. On the box door, a control panel is cooperatively provided. On the back of the box door, a secondary PCB board is cooperatively provided. Behind the secondary PCB board, a cooperative mounting board is cooperatively provided. The cooperative mounting board is provided with cooperative wire routing holes.

[0010] Preferably, the box body is a cuboid. In the center of the bottom of the box body, a wiring port slot is provided. Inside the wiring port slot, a wiring port is provided. An insulating rubber pad is provided on the inner wall of the port of the wiring port. Heat dissipation openings and heat dissipation fans are provided on both side walls of the box body.

[0011] Preferably, capacitors are cooperatively provided on the heat dissipation substrate. On the surface of the heat dissipation substrate, heat conduction and flow guiding ribs are uniformly provided in the vertical direction. The heat conduction and flow guiding ribs and the heat dissipation substrate are of an integral structure. The heat conduction and flow guiding ribs are of a hollow structure.

[0012] Preferably, on the inverter, an input positive electrode, an input negative electrode and an AC output port are provided.

[0013] Preferably, on the control panel, there are a display, an emergency stop switch. The control panel and the PCB main board are cooperatively connected by wires.

[0014] Preferably, a mutual inductor is cooperatively provided on the conductive copper sheet.

[0015] Preferably, one side edge of the flow guiding heat dissipation fin is fixedly connected to the outer wall of the condensation pipe. The condensation pipes are neatly arranged in a snake shape. One end of the condensation pipe is provided with a hydraulic pump.

[0016] Preferably, there is an auxiliary cooling box which is communicated with the box body. Auxiliary heat dissipation fans are provided on both inner walls of the auxiliary cooling box.

[0017] Preferably, a main control CPU module is provided on the secondary PCB board. A signal input port is provided on one side edge of the secondary PCB board. A cable is provided between the secondary PCB board and the PCB main board.

[0018] Preferably, an air cooling method for an inverter with efficient air cooling includes the following steps:

[0019] The hydraulic machine connected to the cold air cooling mechanism works, and the squeezed liquid nitrogen is conveyed into the inside of the condensation pipe. The air outside the condensation pipe and the condensation pipe conduct heat transfer, so that the temperature of the air outside the cold air cooling mechanism drops rapidly;

[0020] The fan at the center inside the cold air cooling mechanism rotates. The fan drives the air flow near the condensation pipe, causing the cooled cold air to move towards the inside of a box. At the same time, the air near the condensation pipe is constantly flowing. The air passing through the condensation pipe conducts heat transfer with the condensation pipe, and the cooled cold air flow uniformly moves towards the inside of the box;

[0021] The cold air entering the inside of the box conducts heat transfer with the components inside the box. The temperature of the hardware inside the box conducts heat transfer with the cold air, causing the heat of the hardware to be quickly carried away;

[0022] The air flow after heat transfer is discharged from the inside of the box under the action of the auxiliary cooling box.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] (1) A wiring port slot is provided at the center of the bottom of the box. A wiring port is provided inside the wiring port slot. Each wiring port is an independent wiring port. An insulating rubber pad is provided on the inner wall of the port of the wiring port. This not only insulates the connecting wire, but also positions and fixes the wire harness;

[0025] (2) A heat dissipation substrate is provided inside the box. Cold air cooling mechanisms are symmetrically provided at the bottom edge of the heat dissipation substrate. An external frame is provided on the cold air cooling mechanism. Both sides of the external frame are open, which can achieve two-way flow guiding and greatly improve the cooling efficiency;

[0026] (3) Condensation pipes and diversion heat dissipation fins are equidistantly provided on both sides of the fan. One side edge of the diversion heat dissipation fin is fixedly connected to the outer wall of the condensation pipe. The condensation pipes are neatly arranged in a snake shape. A hydraulic pump is provided at one end of the condensation pipe. After the liquid nitrogen is squeezed and cooled by the hydraulic pump, it is pushed into the inside of the condensation pipe, and the external connected diversion heat dissipation fins are used to quickly cool the air temperature through the condensation pipe;

[0027] (4) Heat conduction and diversion ribs are uniformly provided on the surface of the heat dissipation substrate 23 in the vertical direction. The heat conduction and diversion ribs and the heat dissipation substrate are of an integral structure. The heat conduction and diversion ribs are of a hollow structure. The hollow heat conduction and diversion ribs not only increase the heat absorption area, but also enable the low-temperature air flow to pass through the inside and outside of the heat conduction and diversion ribs, realizing two-way cooling and greatly improving the cooling and heat dissipation efficiency;

[0028] (5) The auxiliary cooling box is communicated with the box. Auxiliary cooling fans are provided on both inner walls of the auxiliary cooling box. The auxiliary cooling box 33 quickly discharges the hot air flow inside the box from the ventilation openings on both sides of the box through the auxiliary cooling fans on both inner walls, greatly improving the heat dissipation efficiency of the inverter body;

[0029] (6) The inverter body adopts a method combining a condenser tube and a fan, which rapidly reduces the air temperature around the cold air cooling mechanism. The cold air cooling mechanism then pushes the cooled cold air flow into the interior of the box to rapidly cool the components inside the box. The air flow that has undergone heat transfer is discharged from the interior of the box under the action of the auxiliary cooling box. By continuously performing heat transfer between the cold air flow and the heat-generating components, the cooling efficiency is greatly improved. The cooled cold air not only has a good cooling effect but also better cooling stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of the inverter of the present invention;

[0031] Figure 2 is a schematic structural diagram of the opened cover of the inverter box of the present invention;

[0032] Figure 3 is a schematic structural diagram of the internal hardware of the inverter of the present invention;

[0033] Figure 4 is a schematic structural diagram of the box body of the inverter of the present invention near the backplane;

[0034] Figure 5 is a schematic structural diagram of the inverter of the present invention;

[0035] Figure 6 is a schematic structural diagram of the cold air cooling mechanism of the present invention;

[0036] Figure 7 is a cross-sectional view of the heat dissipation substrate of the present invention;

[0037] Figure 8 is a schematic diagram of the interface of the heat conduction and flow guiding ribs of the present invention.

[0038] In the figures: 1, inverter body; 2, box body; 3, cooling mechanism; 4, box door; 5, control panel; 6, fixing plate; 7, backplane; 8, PCB main board; 9, mating mounting plate; 10, sub-PCB board; 11, signal input port; 12, mating wiring hole; 13, wiring harness; 14, surge protector; 15, rectifier bridge; 16, inverter; 17, current transformer; 18, drive board; 19, power module; 20, drive; 21, DC contactor; 22, capacitor; 23, heat dissipation substrate; 24, heat conduction and flow guiding ribs; 25, cold air cooling mechanism; 26, external frame; 27, fan; 28, condenser tube; 29, flow guiding heat dissipation fin; 30, wiring groove; 31, wiring port groove; 32, conducting copper sheet; 33, auxiliary cooling box. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] Please refer to Figures 1-8 , the present invention provides a technical solution: a frequency converter with efficient air-cooled heat dissipation, including a frequency converter body 1. A box body 2 is provided on the frequency converter body 1. The box body 2 is a cuboid. Heat dissipation holes with a diameter of 2-3 mm are provided on the back plate of the box body 2. A wiring port groove 31 is provided at the center of the bottom of the box body 2. A wiring port is provided inside the wiring port groove 31. Each wiring port is an independent wiring port. An insulating rubber pad is provided on the inner wall of the port of the wiring port. This not only insulates the connecting wire, but also positions and fixes the wire harness. Heat dissipation ports and heat dissipation fans are provided on both side walls of the box body 2.

[0041] A heat dissipation substrate 23 is provided inside the box body 2. Cold air heat dissipation mechanisms 25 are symmetrically provided at the bottom edge of the heat dissipation substrate 23. An external frame 26 is provided on the cold air heat dissipation mechanism 25. Both sides of the external frame 26 are open, which can achieve two-way flow guidance and greatly improve the cooling efficiency. A fan 27 is provided at the center inside the external frame 26. The fan 27 is vertically installed. Condensation tubes 28 and flow guiding heat dissipation fins 29 are provided at equal intervals on both sides of the fan 27. One side edge of the flow guiding heat dissipation fin 29 is fixedly connected to the outer wall of the condensation tube 28. The condensation tubes 28 are arranged neatly in a snake shape. One end of the condensation tube 28 is provided with a hydraulic pump. After the liquid nitrogen is squeezed and cooled by the hydraulic pump, it is pushed into the condensation tube 28, and the air temperature is quickly cooled by the flow guiding heat dissipation fins 29 connected to the outside through the condensation tube 28.

[0042] A PCB main board 8 is provided on the front surface of the heat dissipation substrate 23. The PCB main board 8 is fixedly installed with the back plate of the box body 2. A surge protector 14, a rectifier bridge 15, a drive board 18, a power module 19, and a driver 20 are provided on the PCB main board 8. A DC contactor 21 and a rectifier block are provided on one side of the rectifier bridge 15 in cooperation. The power module 19 includes a capacitor, a voltage regulator, and a current protector. The command signal of the PCB main board 8 is transmitted to the drive board 18, and the drive board 18 sends the signal to the secondary PCB board 10.

[0043] Below the drive board 18, a plurality of inverters 16 are cooperatively provided. The inverters 16 are provided with an input positive electrode, an input negative electrode, and an AC output port. After the current is inverted by the inverter, 380V voltage is output from the AC output port. Below the inverter 16, a wiring port slot 31 is provided. A conduction copper sheet 32 is used to cooperatively connect between the plurality of inverters 16 and the wiring port slot 31 below. A current transformer 17 is cooperatively provided on the conduction copper sheet 32. The current transformer 17 monitors the current and feeds back the monitored current magnitude to the PCB main board 8.

[0044] On the front of the box body 2, a box door 4 is provided. A control panel 5 is cooperatively provided on the box door 4. On the back of the box door 4, a secondary PCB board 10 is cooperatively provided. Behind the secondary PCB board 10, a cooperative mounting plate 9 is cooperatively provided. The cooperative mounting plate 9 is provided with cooperative wire routing holes 12. The secondary PCB board 10 is provided with a main control CPU module. On one side edge of the secondary PCB board 10, a signal input port 11 is provided. A flexible cable 13 is provided between the secondary PCB board 10 and the PCB main board 8.

[0045] Capacitors 22 are cooperatively provided on the heat dissipation substrate 23. On the surface of the heat dissipation substrate 23, heat conduction and flow guiding ribs 24 are uniformly provided in the vertical direction. The heat conduction and flow guiding ribs 24 and the heat dissipation substrate 23 are of an integral structure. The heat conduction and flow guiding ribs 24 are of a hollow structure. The hollow heat conduction and flow guiding ribs 24 not only increase the heat absorption area, but also enable the low-temperature air flow to pass through the inside and outside of the heat conduction and flow guiding ribs 24, realizing two-way cooling and greatly improving the cooling and heat dissipation efficiency.

[0046] The control panel 5 includes a display, an emergency stop switch. The control panel 5 is cooperatively connected to the PCB main board 8 by wires. The control panel 5 adjusts the data of the frequency converter and controls the entire frequency converter, enabling the frequency converter to control different current data.

[0047] The auxiliary cooling box 33 is communicated with the box body 2. Auxiliary cooling fans are provided on both inner walls of the auxiliary cooling box 33. The auxiliary cooling fans on both inner walls of the auxiliary cooling box 33 quickly discharge the hot air flow inside the box body from the ventilation openings on both sides of the box body 2, greatly improving the heat dissipation efficiency of the frequency converter body 1.

[0048] The air cooling method of the frequency converter with high-efficiency air cooling: The hydraulic machine connected to the air cooling heat dissipation mechanism 25 works, and the squeezed liquid nitrogen is conveyed to the inside of the condensation pipe 28. The air outside the condensation pipe 28 performs heat and cold transfer with the condensation pipe 28, so that the temperature of the air outside the air cooling heat dissipation mechanism 25 drops rapidly.

[0049] The fan 27 at the center inside the cold air cooling mechanism 25 rotates, and the fan 27 drives the air flow near the condenser tube 28, causing the cooled cold air to move towards the inside of a box body 2. At the same time, the air near the condenser tube 28 is constantly flowing, and the air passing through the condenser tube 28 undergoes heat transfer with the condenser tube 28, and the cooled cold air flow uniformly flows towards the inside of the box body 2.

[0050] The cold air entering the inside of the box body 2 undergoes heat transfer with the components inside the box body 2. The temperature of the hardware inside the box body 2 undergoes heat transfer with the cold air, causing the heat of the hardware to be quickly carried away. The air flow after heat transfer is discharged from the inside of the box body 2 under the action of the auxiliary cooling box 22.

[0051] The frequency converter body 1 adopts a method combining a condenser tube and a fan, causing the air temperature around the cold air cooling mechanism 25 to rapidly drop. The cold air cooling mechanism 25 then pushes the cooled cold air flow into the inside of the box body 2 to quickly cool the components inside the box body 2. The air flow after heat transfer is discharged from the inside of the box body 2 under the action of the auxiliary cooling box 33. By continuously using cold air flow to conduct heat transfer with the heat-generating components, the cooling efficiency is greatly improved. The cooled cold air not only has a good cooling effect, but also has better cooling stability.

[0052] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A frequency converter with efficient air-cooled heat dissipation, comprising a frequency converter body (1), characterized in that: A box body (2) is provided on the frequency converter body (1). A heat dissipation substrate (23) is provided inside the box body (2). Cold air heat dissipation mechanisms (25) are symmetrically provided at the bottom edge of the heat dissipation substrate (23). An external frame (26) is provided on the cold air heat dissipation mechanism (25). Both sides of the external frame (26) are open. A fan (27) is provided in the center of the external frame (26). Condensing tubes (28) and flow guiding heat dissipation fins (29) are equidistantly provided on both sides of the fan (27). The front surface of the heat dissipation substrate (23) is provided with a PCB main board (8). The PCB main board (8) is fixedly installed on the back board of the box body (2). A surge protector (14), a rectifier bridge (15), a drive board (18), a power module (19), and a driver (20) are provided on the PCB main board (8). A DC contactor (21) and a rectifier block are provided on one side of the rectifier bridge (15) in cooperation. A plurality of inverters (16) are provided below the drive board (18) in cooperation. A wiring port slot (31) is provided below the inverters (16). The plurality of inverters (16) are respectively connected to the wiring port slot (31) below by a conducting copper sheet (32) in cooperation. A box door (4) is provided on the front surface of the box body (2). A control panel (5) is provided on the box door (4) in cooperation. A secondary PCB board (10) is provided on the back surface of the box door (4) in cooperation. A cooperation mounting plate (9) is provided behind the secondary PCB board (10) in cooperation. Cooperation wire routing holes (12) are provided on the cooperation mounting plate (9).

2. The variable frequency drive with efficient air-cooled heat dissipation according to claim 1, wherein: The box body (2) is a cuboid. A wiring port slot (31) is provided in the center of the bottom of the box body (2). A wiring port is provided inside the wiring port slot (31). An insulating rubber pad is provided on the inner wall of the port of the wiring port. Heat dissipation ports and heat dissipation fans are provided on both side walls of the box body (2).

3. An inverter with efficient air-cooled heat dissipation according to claim 1, characterized in that: A capacitor (22) is provided on the heat dissipation substrate (23) in cooperation. Heat conducting and flow guiding ribs (24) are uniformly provided on the surface of the heat dissipation substrate (23) in the vertical direction. The heat conducting and flow guiding ribs (24) and the heat dissipation substrate (23) are of an integral structure. The heat conducting and flow guiding ribs (24) are of a hollow structure.

4. An inverter with efficient air-cooled heat dissipation according to claim 1, characterized in that: The inverter (16) is provided with an input positive electrode, an input negative electrode, and an AC output port.

5. An inverter with efficient air-cooled heat dissipation according to claim 1, characterized in that: The control panel (5) includes a display, an emergency stop switch. The control panel (5) is connected to the PCB main board (8) by a wire in cooperation.

6. The frequency converter with efficient air-cooled heat dissipation according to claim 1, characterized in that: A mutual inductor (17) is provided on the conducting copper sheet (32) in cooperation.

7. An inverter with efficient air-cooled heat dissipation according to claim 1, characterized in that: One side edge of the flow guiding heat dissipation fin (29) is fixedly connected to the outer wall of the condensing tube (28). The condensing tubes (28) are arranged neatly in a snake shape. A hydraulic pump is provided at one end of the condensing tube (28).

8. An inverter with efficient air-cooled heat dissipation according to claim 1, characterized in that: An auxiliary cooling box (33) is provided. The auxiliary cooling box (33) is communicated with the box body (2). Auxiliary heat dissipation fans are provided on both inner walls of the auxiliary cooling box (33).

9. An inverter with efficient air-cooled heat dissipation according to claim 1, characterized in that: A main control CPU module is provided on the secondary PCB board (10). A signal input port (11) is provided at one side edge of the secondary PCB board (10). A cable (13) is provided between the secondary PCB board (10) and the PCB main board (8).

10. The air-cooling method for an inverter with efficient air-cooling heat dissipation as described in claim 1 includes the following steps: The hydraulic press connected to the cold air heat dissipation mechanism (25) operates to convey the extruded liquid nitrogen into the interior of the condensation tube (28). The air outside the condensation tube (28) undergoes heat transfer with the condensation tube (28), causing the temperature of the air outside the cold air heat dissipation mechanism (25) to drop rapidly. The fan (27) at the center inside the cold air heat dissipation mechanism (25) rotates. The fan (27) drives the air flow near the condensation tube (28), causing the cooled cold air to move towards the interior of a box body (2). At the same time, the air near the condensation tube (28) is constantly flowing, and the air passing through the condensation tube (28) undergoes heat transfer with the condensation tube (28). The cooled cold air flow uniformly moves towards the interior of the box body (2). The cold air entering the interior of the box body (2) undergoes heat transfer with the components inside the box body (2). The temperature of the hardware inside the box body (2) undergoes heat transfer with the cold air, causing the heat of the hardware to be rapidly removed. The air flow that has undergone heat transfer is discharged from the interior of the box body (2) under the action of the auxiliary cooling box (22).

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