Cooling system of variable-frequency speed regulation control device of high-power driving water injection pump

Abstract

The utility model discloses a heat dissipation system of a frequency conversion speed regulation control device of a high-power driving water injection pump, which comprises an inner module and an outer module which form double-channel heat dissipation, and the outer module comprises a screen cabinet and a top fan arranged inside the screen cabinet. The inner module comprises a DSP board, a temperature sensor, a fan in the frequency conversion cabinet, a fan support, a fan fixing plate, a cooling fin fixing plate, an insertion radiator, a rectifier bridge module, an IGBT module, a capacitor and a capacitor fixing plate, heat is discharged from an outlet of a cooling channel through insertion of the insertion radiator, the wind speed of the fan can be adjusted according to the actual temperature, the cooling function is achieved, and the service life of the frequency conversion cabinet is prolonged. Therefore, the rectifier bridge and the IGBT work in a normal temperature range, damage is avoided, the equipment reliability is improved, the equipment performance is improved, the working environment is improved, the environmental adaptability is enhanced, the maintenance cost is reduced, internal components of the frequency conversion speed regulation control device are effectively prevented from being damaged due to over-temperature, and high-reliability operation of the frequency conversion device is effectively guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor speed regulation control, and in particular relates to the optimization of a variable frequency speed regulation heat dissipation system. Background Art

[0002] Variable frequency speed regulation technology changes the synchronous speed of a motor by varying the frequency of its stator power supply, thereby achieving motor speed regulation. This technology is widely used in the field of motor control. With the development of power electronics, microelectronics, and control theory, variable frequency speed regulation technology has been continuously optimized and improved.

[0003] During inverter operation, power devices in the main circuit (such as IGBTs or IGCTs) generate a significant amount of heat. This heat primarily originates from components such as the isolation transformer, reactors, power unit, and control system. Heat dissipation is particularly critical for power devices, which serve as electronic switches in the main circuit. If this heat is not dissipated promptly, it will cause the temperature of the active chip area within the power electronic device and its junction temperature to rise. The failure rate of power electronic devices is exponentially related to their junction temperature: for every 10°C increase in device operating temperature, the failure rate doubles. Therefore, an effective heat dissipation system is crucial to ensuring stable inverter operation.

[0004] Given that VFDs generate significant heat during operation and that thermal failure significantly impacts equipment reliability, heat dissipation design is crucial for ensuring proper operation. A sound heat dissipation design not only lowers the operating temperature and reduces the risk of thermal failure, but also improves equipment efficiency and lifespan.

[0005] To this end, in response to the above technical problems, the inverter heat dissipation design is carried out based on the working principle of the inverter and heat generation, thermal failure, heat dissipation technology, etc., and the heat dissipation system of the inverter is optimized and improved. Through reasonable heat dissipation design, a more reliable guarantee is provided for the stable operation of the inverter. Utility Model Content

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and to propose a heat dissipation system for a variable frequency speed control device of a high-power driven water injection pump, which can improve the stable operation of the frequency conversion device.

[0007] The technical solution adopted by the utility model is: a heat dissipation system of a variable frequency speed control device for a high-power driven water injection pump, comprising an inner module and an outer module, forming a dual-channel heat dissipation;

[0008] The external module includes a screen cabinet and a top fan, which form an external heat dissipation channel. The screen cabinet is composed of a front door, a rear door, a top door, and a bottom door. The screen cabinet has a built-in inverter. The top fan is installed above the screen cabinet. The front door and the rear door are provided with shutters to form a vent. The bottom door is provided with a wire hole for ventilation. The inverter is installed in the screen cabinet through a fixed bracket. The inverter is connected to the PLC through a signal line, and the top fan is connected to the PLC.

[0009] The inner module includes a fan fixing plate, a heat dissipation fin fixing plate, a capacitor fixing plate, a top plate, a bottom plate, and a side plate. The above components are welded together to form an internal heat dissipation channel. A plug-in heat sink is fixed to the heat dissipation fin fixing plate by screws. A fan blowing air toward the plug-in heat sink is placed on the fan fixing plate. A rectifier bridge module and an IGBT module are horizontally installed on the plug-in heat sink. The bottom of the rectifier bridge module is coated with heat dissipation paste and fixed to the plug-in heat sink. The bottom of the IGBT module is coated with heat dissipation paste and fixed to the plug-in heat sink. The rectifier bridge module and the IGBT module are connected with a busbar. A capacitor is installed on the capacitor fixing plate.

[0010] Preferably, the outer module has two top fans and the inner module has three top fans.

[0011] Preferably, there are nine rectifier bridge modules, and the four legs of the rectifier bridge modules are fixed to the insert heat sink by screws with a diameter of 5 mm. There are six IGBT modules, and the four legs of the IGBT modules are fixed by screws. The nine rectifier bridge modules, the six IGBT modules, and the rectifier bridge modules and the IGBT modules are connected to each other by busbars.

[0012] Preferably, there are ten capacitors, with four placed in each of the top two rows and two placed in the third row. The symmetrical center lines of the two capacitors are spaced 120 mm apart, and the upper and lower capacitors are also spaced 120 mm apart to fully ensure that the heat dissipation channel is maximized.

[0013] Preferably, the insert heat sink is further provided with a surface mount temperature sensor, and the insert heat sink temperature is processed as a signal via a DSP board.

[0014] The utility model takes the plug-in heat sink as the core to realize the heat dissipation of the rectifier bridge module and the IGBT module. The plug-in heat sink is in contact with the plug-in heat sink through the heat dissipation paste and is fixed to the plug-in heat sink with screws. The heat generated by the plug-in heat sink is conducted through the plug-in heat sink, and then the heat is discharged from the bottom forced air cooling outlet through the three top fans from the upper end forced air cooling inlet. In addition, the air volume of the three fans is adjusted in real time by detecting the temperature of the plug-in heat sink. The collected temperature signal is converted by the DSP control board to realize the control of the top fan, effectively ensuring the stability and reliable operation of the work.

[0015] Beneficial effects: The utility model optimizes the heat dissipation channel, increases the temperature control function, improves the degree of automation, and has the advantages of a more compact structure and easy implementation through the frequency conversion speed control device heat dissipation system of the high-power driven water injection pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the external module of the heat dissipation system of the variable frequency speed regulation control device of the present utility model.

[0017] Figure 2 It is a schematic diagram of the internal modules of the heat dissipation system of the variable frequency speed regulation control device of the utility model. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is described in detail below with reference to the accompanying drawings and specific embodiments:

[0019] like Figure 1 and 2 As shown, a heat dissipation system of a variable frequency speed control device for driving a high-power water injection pump includes an inner module and an outer module to form a dual-channel heat dissipation;

[0020] The external module includes a cabinet and a top fan 1, which form an external heat dissipation channel. The cabinet consists of a front door 2, a rear door 3, a top door 4, and a bottom door 5. The cabinet houses a built-in inverter 6. Two top fans 1 are installed above the cabinet to reduce noise levels during equipment operation and improve the working environment. They form a dual-channel heat dissipation channel with the inverter, further effectively reducing equipment temperature. The cabinet also improves the inverter's protection level, preventing external substances such as dust and moisture from entering the equipment, further ensuring the reliability and safety of the equipment. The front door 2 and rear door 3 have louvers to form vents for ventilation and heat dissipation. The bottom door 5 has a ventilated cable hole. The inverter 6 is installed in the cabinet via a fixed bracket. The cable in the bottom door cable hole is connected to the internal molded case circuit breaker, then to the AC reactor, and then to the inverter's R, S, and T terminals. The built-in inverter is connected to the PLC via a signal line. The top fan 1 is connected to the PLC and is controlled by the cabinet's built-in PLC to dissipate heat generated by the inverter 6.

[0021] The inner module includes a fan fixing plate 7, a heat dissipation fin fixing plate 8, a capacitor fixing plate 9, a top plate 10, a bottom plate 11, and a side plate 12. The above components are welded together to form an internal heat dissipation channel. A plug-in heat sink 13 is fixed to the heat dissipation fin fixing plate 8 by screws. A fan 14 for blowing air toward the plug-in heat sink 13 is placed on the fan fixing plate 7. There are three fans 14 to reduce noise problems when the equipment is in use. A rectifier bridge module 15 and an IGBT module 16 are horizontally installed on the plug-in heat sink 13. The rectifier bridge module The bottom of the rectifier bridge module 15 is coated with thermal paste and fixed to the insert heat sink 13. There are nine rectifier bridge modules 15, and the four legs of the rectifier bridge module 15 are fixed to the insert heat sink 13 with screws of 5mm diameter. The bottom of the IGBT module 16 is coated with thermal paste and fixed to the insert heat sink 13. There are six IGBT modules 16, and the four legs of the IGBT module 16 are fixed with screws. Busbars are used to connect the nine rectifier bridge modules 15, the six IGBT modules 16, and the rectifier bridge modules 15 and the IGBT modules 16. The capacitor fixing plate 9 is equipped with ten capacitors 17, four in each of the two upper rows and two in the third row. The symmetrical center lines of the two capacitors are spaced 120mm apart, and the upper and lower ones are also spaced 120mm apart to fully ensure the maximum heat dissipation channel. The heat generated by the rectifier bridge module 15 and the IGBT module 16 is conducted through the insert heat sink 13, removed by the fan 14, and then discharged through the top fan 1 of the panel cabinet to achieve a protective effect and prevent overheating.

[0022] The insert heat sink 13 is also equipped with a patch temperature sensor, which processes the temperature of the insert heat sink through the DSP board to control the size of the air volume of the three fans and improve the degree of automation.

[0023] The heat dissipation system of the variable frequency speed control device of the utility model for a high-power driven water injection pump includes its internal and external modules, realizing dual-channel heat dissipation, which has significant benefits in improving equipment reliability, enhancing equipment performance, improving working environment, enhancing environmental adaptability and reducing maintenance costs.

[0024] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A heat dissipation system of a variable frequency speed control device for driving a water injection pump, characterized in that: Includes inner and outer modules to form dual-channel heat dissipation; The external module includes a screen cabinet and a top fan, which form an external heat dissipation channel. The screen cabinet is composed of a front door, a rear door, a top door, and a bottom door. The screen cabinet has a built-in inverter. The top fan is installed above the screen cabinet. The front door and the rear door are provided with shutters to form a vent. The bottom door is provided with a wire hole for ventilation. The inverter is installed in the screen cabinet through a fixed bracket. The inverter is connected to the PLC through a signal line, and the top fan is connected to the PLC. The inner module includes a fan fixing plate, a heat dissipation fin fixing plate, a capacitor fixing plate, a top plate, a bottom plate, and a side plate. The above components are welded together to form an internal heat dissipation channel. A plug-in heat sink is fixed to the heat dissipation fin fixing plate by screws. A fan blowing air towards the plug-in heat sink is placed on the fan fixing plate. A rectifier bridge module and an IGBT module are horizontally installed on the plug-in heat sink. The bottom of the rectifier bridge module is coated with heat dissipation paste and fixed to the plug-in heat sink. The bottom of the IGBT module is coated with heat dissipation paste and fixed to the plug-in heat sink. The rectifier bridge module and the IGBT module are connected with a busbar. A capacitor is installed on the capacitor fixing plate.

2. The heat dissipation system of a variable frequency speed control device for driving a water injection pump according to claim 1, characterized in that: The outer module has two top fans, and the inner module has three top fans.

3. The heat dissipation system of a variable frequency speed control device for driving a water injection pump according to claim 2, characterized in that: There are nine rectifier bridge modules, and the four legs of the rectifier bridge modules are fixed to the insert heat sink by screws with a diameter of 5 mm. There are six IGBT modules, and the four legs of the IGBT modules are fixed by screws. The nine rectifier bridge modules, the six IGBT modules, and the rectifier bridge modules and the IGBT modules are connected to each other by busbars.

4. The heat dissipation system of a variable frequency speed control device for driving a water injection pump according to claim 3, characterized in that: There are ten capacitors, four in each of the top two rows, two in the third row, with a 120mm distance between the symmetrical center lines of each pair, and a 120mm distance between the upper and lower two.

5. The heat dissipation system of a variable frequency speed control device for driving a water injection pump according to claim 4, characterized in that: The insert heat sink is also provided with a surface mount temperature sensor, which processes the temperature of the insert heat sink through a DSP board.

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