Frequency conversion cabinet of electric submersible pump

Abstract

The invention relates to the technical field of frequency converters, and particularly discloses an electric submersible pump frequency conversion cabinet which comprises an independent air duct, a power device main cavity, an RST inlet wire wiring cavity, a UVW outlet wire wiring cavity, an electric energy meter and telemeter sharing cavity, an insulation detector cavity, an external output terminal strip cavity and a display cavity. The frequency conversion cabinet provided by the invention adopts an upper-in and upper-out connection mode, so that an operator can stand, and quick wiring can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency converters, and more specifically, to a frequency converter cabinet for a submersible electric pump. Background Art

[0002] The frequency converter cabinets currently on the market are mainly designed to prevent rainwater intrusion. Their overall functions are mostly concentrated in a main chamber, and the main chamber is sealed to improve the protection capability. However, this design has many problems in practical applications. For example, when operating or maintaining the equipment, frequently opening the door of the main chamber may cause damage to the sealing strip and reduce the sealing performance, thereby increasing the risk of dust or moisture entering the main chamber, damaging key components, and shortening the life of the equipment. In addition, most frequency converter cabinets use a bottom-in and bottom-out wiring method, which requires operators to squat to complete the wiring operation, which is not only inefficient, but also easy to cause human fatigue or occupational injury, and does not conform to the ergonomic design principles. At the same time, in industries such as petroleum, since the location of the frequency converter cabinet is usually not fixed, the need for frequent movement increases the complexity of wiring and disconnection, and the traditional wiring method further reduces the efficiency of on-site operations, which brings great challenges to the reliability and ease of use of the equipment. Therefore, there is an urgent need for an innovative design that can solve the above problems to improve the reliability, ease of use and operating efficiency of the frequency converter cabinet in complex environments. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a submersible electric pump frequency conversion cabinet, which enables each chamber of the frequency conversion cabinet to operate independently and avoid interference by providing a modular layout of functional area design. The operator does not need to frequently open the main chamber door panel, thereby reducing damage to the sealing strip and extending the service life of the equipment. The top-in and top-out wiring method is adopted to avoid the disadvantages of the traditional bottom-in and bottom-out wiring method, improve operating efficiency and comply with ergonomics. The heat dissipation problem is effectively solved by designing an independent air duct. Its unique air inlet structure is waterproof and dustproof to ensure internal cleanliness. The fan and radiator cooperate to ensure efficient heat discharge and prevent hot air backflow, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: A submersible electric pump frequency conversion cabinet, comprising: an independent air duct running through the bottom and rear of the frequency conversion cabinet; a main chamber of a power device arranged at the upper position in the outdoor side cabinet; an RST incoming wiring chamber arranged at the left rear of the exterior of the frequency conversion cabinet; a UVW outgoing wiring chamber arranged at the right rear of the exterior of the frequency conversion cabinet, symmetrically distributed with the RST incoming wiring chamber; a common chamber for an electric energy meter and a telemeter, located at the upper right of the exterior of the frequency conversion cabinet, connected to the main chamber of the power device through a signal line; an insulation detector chamber, which monitors the insulation state of the circuit in real time, arranged in the middle right of the exterior of the frequency conversion cabinet; an external output terminal row chamber arranged in parallel with the insulation detector chamber; a display chamber installed at the upper part of the front of the frequency conversion cabinet, connected to the main chamber of the power device and the common chamber for the electric energy meter and the telemeter through a signal line.

[0005] As a further solution of the present invention, an air inlet is provided in the independent air duct, and the air inlet is located in the lower part of the frequency converter cabinet, and adopts a wavy structure and dust filter cotton design. An input inductor is provided in the middle of the air duct for smoothing current fluctuations. An output inductor is provided next to the input inductor for smoothing the output waveform. An IGBT heat sink is provided in the independent air duct for absorbing the heat generated by the operation of the IGBT module and quickly dissipating the heat through the air cooling system. A rectifier diode heat sink is provided above the IGBT heat sink for heat management of the rectifier diode. An air outlet is provided at the upper part of the rear of the frequency converter cabinet for discharging hot air.

[0006] As a further solution of the present invention, the main chamber of the power device is connected to the input inductor and the output inductor in the independent air duct through a copper busbar. A circuit breaker is provided in the middle and upper part of the main chamber of the power device for cutting off the circuit. A rectifier diode is provided in the middle part of the main chamber of the power device, which is responsible for converting AC power into DC power and is connected to the capacitor through a copper busbar. The capacitor is located in the middle and lower part of the frequency converter cabinet and is used for energy storage and current stabilization. An IGBT module is provided in the lower part of the main chamber of the power device and is connected to the independent air duct through an IGBT heat sink for exporting heat energy.

[0007] As a further solution of the present invention, the RST incoming wiring cavity is connected to the circuit breaker of the main chamber of the power device through a copper busbar. A first copper terminal is provided at the upper part of the RST incoming wiring cavity for connecting an external cable. A first hexagon socket set screw is provided next to the first copper terminal for locking the cable.

[0008] As a further solution of the present invention, the UVW outgoing wiring cavity is symmetrically distributed with the RST incoming wiring cavity. The UVW outgoing wiring cavity is connected to the main cavity of the power device through a copper bar. A second copper terminal is provided at the upper part of the UVW outgoing wiring cavity for connecting an external load cable. A second hexagon socket set screw is provided next to the second copper terminal for fixing the output cable.

[0009] As a further solution of the present invention, the common cavity of the electric energy meter and telemeter is connected to the main cavity of the power device through a signal line, which is used to monitor the operation status of the electric energy and the frequency converter cabinet. The common cavity of the electric energy meter and telemeter realizes the collection of electric energy measurement and telemetry signals, which is convenient for remote monitoring. An electric energy meter is arranged in the middle of the common cavity of the electric energy meter and telemeter, which is used to measure the electric energy consumption of the equipment. A telemeter is arranged near the electric energy meter, which is used to collect the operation status signal of the frequency converter cabinet and transmit it to the control system.

[0010] As a further solution of the present invention, the insulation detector cavity monitors the circuit insulation status in real time. An insulation detector is arranged in the middle of the insulation detector cavity for detecting the insulation of the circuit. The insulation detector cavity also includes a wiring terminal for connecting a detector signal line.

[0011] As a further solution of the present invention, the external output terminal row cavity is connected to the power device main cavity and the display cavity through a signal line, providing a variety of signal interfaces for controlling external devices and transmitting signals. The external output terminal row cavity has multiple wiring terminals built in for connecting external control circuits.

[0012] As a further solution of the present invention, the display cavity is connected to the main cavity of the power device and the common cavity of the electric energy meter and the telemeter through a signal line. The display cavity provides a human-computer interaction interface, which is convenient for monitoring the status of the frequency converter cabinet and controlling the operation of the frequency converter cabinet. A touch screen 8 is provided in the center of the display cavity for displaying the operating status and parameters of the equipment. A keyboard is provided near the touch screen, and an air switch is provided below the keyboard for disconnecting the internal circuit. Four indicator lights are provided on the upper part of the display cavity for displaying the operating status of the frequency converter cabinet. The display cavity is also provided with a circuit breaker switch wrench for operating the circuit breaker in the main cavity of the power device.

[0013] As a further solution of the present invention, the main circuit design of the frequency converter cabinet ensures the stable operation and heat dissipation of the frequency converter cabinet through modular layout and power transmission path, including the following specific contents: power is introduced from the outside through the RST cable, and connected to the first copper terminal in the RST incoming wiring cavity located at the right rear of the frequency converter cabinet. The first copper terminal is fixed with a first hexagon socket set screw. At the same time, in order to prevent the external cables from loosening due to vibration or environmental influences, a wire binding bracket provided with the machine is designed to clamp and fix the external cables. After wiring, power is transmitted to the inside of the main cavity of the power device through the copper busbar, and is first connected to the circuit breaker in the cavity. As a power protection device, the circuit breaker can quickly cut off the current when an abnormality occurs in the circuit to protect the safe operation of the internal devices. The switch handle of the circuit breaker extends to the display cavity on the upper front of the frequency converter cabinet, and is operated and controlled by the circuit breaker switch wrench in the display cavity, which is convenient for users to perform power-off operations externally.

[0014] The power output from the circuit breaker is further transmitted to the input inductor located in the independent air duct chamber through the copper busbar. After passing through the input inductor, the power is transmitted to the rectifier diode in the main chamber of the power device through the copper busbar. Subsequently, the direct current is connected to the capacitor in the chamber through the copper busbar. Then, the power is transmitted from the capacitor to the IGBT module. In this process, the heat generated by the operation of the rectifier diode and the IGBT module is transferred to the air flow in the independent air duct through the air-cooled radiator for heat dissipation. At the same time, the tail end of the capacitor is directly located in the air duct chamber, and the air duct airflow is used to quickly bring the heat out of the frequency converter cabinet.

[0015] The output power processed by the IGBT module is transmitted to the UVW outgoing wiring cavity through the copper busbar, and the power is output to the external device through the second copper wire terminal in the UVW outgoing wiring cavity. The second copper terminal is fixed with a second hexagon socket set screw and equipped with a wire tie bracket to clamp and fix the external cable, thereby ensuring that the external cable will not loosen or fall off due to vibration or movement in a complex outdoor environment.

[0016] As a further solution of the present invention, the design of the independent air duct of the frequency conversion cabinet solves the problem of heat dissipation of the equipment and improves the operating stability and reliability of the equipment in a complex environment, including the following specific contents: the air inlet of the air duct is arranged at the lower part of the front of the frequency conversion cabinet, adopts a wavy structure design, and a dust filter cotton device is installed at the air inlet. The combination of the wavy structure and the dust filter cotton can not only effectively prevent water droplets from entering the interior of the frequency conversion cabinet, thereby achieving a waterproof effect, but also can filter impurities such as dust and sand in the air to ensure that the airflow entering the frequency conversion cabinet is clean.

[0017] Three fans are installed in the middle of the air duct, and the fans are arranged to form a stable and efficient air circulation. After entering from the air inlet, the air flows through the main heat source components in the independent air duct cavity in sequence, including the input inductor, output inductor, IGBT module and the heat sink of the rectifier diode. The radiator fits tightly to the relevant components, and through the thermal conductive design, the heat generated during the operation of the components is quickly transferred to the air flow in the air duct. The airflow flows along the designed path inside the air duct, gradually taking the heat away from the core area of ​​the frequency converter cabinet, and finally discharged from the air outlet at the upper rear of the frequency converter cabinet. The position of the air inlet and outlet design effectively prevents the phenomenon of hot air backflow.

[0018] As a further solution of the present invention, in the design of other functional areas of the frequency converter cabinet, each functional chamber can be operated independently in a modular manner, including the following specific contents: the independent design of the common chamber of the electric energy meter and the telemeter enables it to avoid the reduction of measurement and signal transmission accuracy due to strong electrical interference; the independent chamber design of the insulation detector chamber is not only convenient for maintenance, but also can effectively prevent the influence of electromagnetic interference generated by other components during operation on the detection accuracy; a plurality of wiring terminals are arranged in the external output terminal row cavity, and the modular terminal design makes wiring easier; the independent design of the display chamber enables the user to complete most of the operation and monitoring tasks without frequently opening the main chamber, thereby improving the usability and maintenance efficiency of the equipment.

[0019] As a further solution of the present invention, the frequency converter cabinet is designed through functional zoning to physically isolate the strong current part and the weak current part, including the following specific contents: the strong current part includes an independent air duct, a main chamber for power devices, an RST incoming wiring chamber, and a UVW outgoing wiring chamber. The weak current part includes a common chamber for an electric energy meter and a telemeter, a display chamber, and an insulation detector chamber. Through physical isolation, the stability and accuracy of weak current signal transmission are ensured, and operators can complete the operation and maintenance of the weak current part without direct contact with the strong current part. In addition, each area is independently distributed, and the operation and maintenance of strong and weak current do not interfere with each other.

[0020] The technical effects and advantages of a submersible electric pump frequency conversion cabinet of the present invention: the present invention adopts the upper inlet and upper outlet wiring mode, which avoids many disadvantages of the traditional lower inlet and lower outlet wiring mode, improves the operating efficiency and conforms to ergonomics. The independent air duct design effectively solves the heat dissipation problem. Its unique air inlet structure is waterproof and dustproof, ensuring internal cleanliness. The fan and the radiator cooperate to ensure efficient heat discharge and prevent hot air from flowing back, thereby improving the operating stability and reliability of the equipment in complex environments. The modular layout of the functional area design, such as the shared cavity of the electric energy meter and the telemeter, the insulation detector cavity, the external output terminal row cavity and the display cavity, makes each cavity independent of each other, avoids interference, and improves the measurement accuracy, maintenance convenience and ease of use. The functional zoning realizes the physical isolation of strong and weak electricity, ensures the stability of weak current signals, and is safe and convenient for operators to operate. It solves the problems of easy damage to the sealing, inconvenient wiring, and low reliability of traditional frequency conversion cabinets, and enhances the reliability, ease of use and operating efficiency of the equipment in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The structure of a submersible electric pump frequency conversion cabinet of the present invention is shown in FIG. Figure 1 .

[0022] Figure 2 The structure of a submersible electric pump frequency conversion cabinet of the present invention is shown in FIG. Figure 2 .

[0023] Figure 3 The structure of a submersible electric pump frequency conversion cabinet of the present invention is shown in FIG. Figure 3 .

[0024] Figure 4 The structure of a submersible electric pump frequency conversion cabinet of the present invention is shown in FIG. Figure 4 .

[0025] Figure 5 The structure of a submersible electric pump frequency conversion cabinet of the present invention is shown in FIG. Figure 5 .

[0026] Figure 6 The structure of a submersible electric pump frequency conversion cabinet of the present invention is shown in FIG. Figure 6 .

[0027] In the figure: 1. Independent air duct; 1-1. Air inlet; 1-2. Input reactor; 1-3. Output reactor; 1-4. IGBT heat sink; 1-5. Rectifier diode heat sink; 1-6. Air outlet; 2-Power device main chamber; 2-1. Circuit breaker; 2-2. Rectifier diode; 2-3. Capacitor; 2-4. IGBT module; 3-RST inlet wiring chamber; 3-1. First copper terminal; 3-2. First hexagon socket set screw; 4. UVW outlet wiring chamber; 4-1. Second copper terminal ;4-2, second hexagon socket set screw;5-common cavity for electric energy meter and telemeter;5-1, electric energy meter;5-2, telemeter;6, insulation tester cavity;6-1 insulation tester;6-2, second wiring terminal;7, external output terminal row cavity;7-1, first wiring terminal;8-display cavity;8-1, touch screen;8-2 keyboard;8-3 air switch;8-4, first indicator light;8-5, second indicator light;8-6, third indicator light;8-7, fourth indicator light;8-8, circuit breaker switch wrench. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] See also Figure 1-Figure 6 As shown in the structural schematic diagram, an embodiment of the present invention provides a submersible electric pump frequency conversion cabinet, the frequency conversion cabinet adopts a wiring method of top-in and top-out, and includes an independent air duct 1 located at the lower part and rear part of the frequency conversion cabinet and running through the bottom and rear part of the frequency conversion cabinet. The independent air duct 1 provides a dedicated air cooling and heat dissipation channel to protect the internal power devices from dust and moisture, and remove heat through airflow. An air inlet 1-1 is provided in the independent air duct 1, and the air inlet 1-1 is located in the lower part of the frequency conversion cabinet. It adopts a wavy structure and a dust filter cotton design to effectively filter impurities in the air and prevent water. An input reactor 1-2 is provided in the middle of the independent air duct 1 for smoothing current fluctuations. An output reactor 1-3 is provided next to the input reactor 1-2 for smoothing the output waveform and ensuring the quality of power transmission. An IGBT heat sink 1-4 is provided in the independent air duct 1 for absorbing the heat generated by the operation of the IGBT module and quickly dissipating the heat through the air cooling system. A rectifier diode heat sink 1-5 is provided above the IGBT heat sink 1-4 for heat management of the rectifier diode. Air outlets 1-6 are provided at the upper part of the rear of the frequency converter cabinet to discharge hot air and avoid backflow.

[0031] The upper part of the frequency converter cabinet is provided with a power device main chamber 2, which is connected to the input inductor 1-2 and the output inductor 1-3 in the independent air duct 1 through a copper busbar. A circuit breaker 2-1 is provided in the middle and upper part of the power device main chamber 2, which is used to cut off the circuit and protect the safety of the frequency converter cabinet. A rectifier diode 2-2 is provided in the middle part of the power device main chamber 2, which is responsible for converting AC power into DC power and is connected to the capacitor 2-3 through a copper busbar. The capacitor 2-3 is located in the middle and lower part of the frequency converter cabinet and is used for energy storage and current stabilization. An IGBT module 2-4 is provided in the lower part of the power device main chamber 2, which is connected to the independent air duct 1 through an IGBT heat sink 1-4 for controlling power conversion.

[0032] At the left rear of the exterior of the frequency converter cabinet, there is an RST incoming wiring chamber 3, which is connected to the circuit breaker 2-1 of the power device main chamber 2 through a copper busbar. The RST incoming wiring chamber 3 is used for power input and provides a cable connection point for quick on-site wiring. A first copper terminal 3-1 is provided at the upper part of the RST incoming wiring chamber 3 for connecting an external cable to ensure that the wiring is firm and reliable. A first hexagon socket set screw 3-2 is provided next to the first copper terminal 3-1 for locking the cable to prevent loosening.

[0033] A UVW outgoing wiring chamber 4 is provided at the left rear of the exterior of the frequency converter cabinet, symmetrically distributed with the RST incoming wiring chamber 3. The UVW outgoing wiring chamber 4 is connected to the IGBT module 2-4 in the main chamber 2 of the power device through a copper busbar, providing an electric power output interface for external devices, which is convenient for quick wiring. A second copper terminal 4-1 is provided at the upper part of the UVW outgoing wiring chamber 4, which is used to connect an external load cable to ensure stable output. A second hexagon socket set screw 4-2 is provided next to the second copper terminal 4-1, which is used to fix the output cable.

[0034] At the upper right corner of the exterior of the frequency converter cabinet, there is a common cavity 5 for an electric energy meter and a telemeter, which is connected to the main cavity 2 of the power device through a signal line and is used to monitor the operation status of the electric energy and the frequency converter cabinet. The common cavity 5 for the electric energy meter and the telemeter realizes the collection of electric energy and telemetry signals, which is convenient for remote monitoring. An electric energy meter 5-1 is located in the middle of the common cavity 5 for the electric energy meter and the telemeter, which is used to measure the electric energy consumption of the equipment. A telemeter 5-2 is located near the electric energy meter 5-1, which is used to collect the operation status signal of the frequency converter cabinet and transmit it to the control system.

[0035] An insulation detector cavity 6 is provided in the middle right of the exterior of the frequency converter cabinet to monitor the circuit insulation status in real time and provide a safety protection function. An insulation detector 6-1 is provided in the middle of the insulation detector cavity 6 to detect the insulation of the line. The insulation detector cavity 6 also includes a second terminal 6-2 for connecting a detector signal line.

[0036] In the middle right part of the frequency converter cabinet, an external output terminal row cavity 7 is arranged in parallel with the insulation monitor cavity. The external output terminal row cavity 7 is connected to the power device main cavity 2 and the display cavity 8 through a signal line, providing a variety of signal interfaces for controlling external devices and transmitting signals. The external output terminal row cavity 7 has a first wiring terminal 7-1 built in, which is used to connect an external control circuit and supports multiple signal inputs and outputs.

[0037] A display cavity 8 is provided at the upper part of the front of the frequency conversion cabinet, which is connected to the main chamber 2 of the power device and the common chamber 5 of the electric energy meter and telemeter through a signal line. The display cavity 8 provides a human-machine interactive interface, which is convenient for monitoring the status of the frequency conversion cabinet and controlling the operation of the frequency conversion cabinet. A touch screen 8-1 is provided in the center of the display cavity 8, which is used to display the operating status and parameters of the equipment and support user input operations. A keyboard 8-2 is provided near the touch screen 8-1 for parameter setting and input operations. An air switch 8-3 is provided below the keyboard 8-2 for disconnecting the internal circuit. Four indicator lights 8-4, 8-5, 8-6, and 8-7 are provided at the upper part of the display cavity 8 to display the operating status of the frequency conversion cabinet. The display cavity 8 is also provided with a circuit breaker switch wrench 8-8 for operating the circuit breaker 2-1 in the main chamber 2 of the power device.

[0038] In this embodiment, the main circuit design of the frequency converter cabinet ensures the stable operation and heat dissipation of the frequency converter cabinet through modular layout and power transmission path. Electricity is introduced from the outside through the RST cable and connected to the first copper terminal 3-1 in the RST incoming wiring chamber 3 located at the right rear of the frequency converter cabinet. The first copper terminal is fixed with the first hexagon socket set screw 3-2. At the same time, in order to prevent the external cables from loosening due to vibration or environmental influences, a wire binding bracket provided by the machine is designed to clamp and fix the external cables. After wiring, electricity is transmitted to the inside of the main chamber 2 of the power device through the copper busbar, and is first connected to the circuit breaker 2-1 in the chamber. As a power protection device, the circuit breaker 2-1 can quickly cut off the current when an abnormality occurs in the circuit to protect the safe operation of the internal devices. The switch handle of the circuit breaker 2-1 extends to the display chamber 8 on the upper front of the frequency converter cabinet, and is operated and controlled by the circuit breaker switch wrench 8-8 in the display chamber 8, which is convenient for users to perform power-off operations externally.

[0039] The power output from the circuit breaker 2-1 is further transmitted to the input inductor 1-2 located in the chamber of the independent air duct 1 through the copper busbar. After passing through the input inductor 1-2, the power is transmitted to the rectifier diode 2-2 in the main chamber 2 of the power device through the copper busbar. Subsequently, the direct current is connected to the capacitor 2-3 in the chamber through the copper busbar. The capacitor 2-3 plays the role of energy storage and current smoothing in the power system, thereby ensuring the current stability of subsequent equipment. Then, the power is transmitted from the capacitor 2-3 to the IGBT module 2-4.

[0040] In this process, the heat generated by the rectifier diode 2-2 and the IGBT module 2-4 during operation is transferred to the air flow in the independent air duct 1 through the air-cooled radiator for effective heat dissipation. At the same time, the tail end of the capacitor 2-3 is directly located in the air duct chamber, and the air flow in the air duct is used to quickly bring the heat out of the frequency converter cabinet. The entire heat dissipation system ensures that the air entering the air duct is clean and flows efficiently through the precisely designed inlet and outlet positions and the dust-proof filter device with a wave structure, effectively avoiding the phenomenon of hot air backflow, and ensuring the heat dissipation requirements of the frequency converter cabinet under high-load operation.

[0041] Finally, the output power processed by the IGBT module 2-4 is transmitted to the UVW outlet wiring cavity 4 through the copper busbar, and the power is output to the external device through the second copper wire terminal 4-1 in the UVW outlet wiring cavity 4. The second copper terminal is fixed with a second hexagon socket set screw 4-2, and is equipped with a wire binding bracket to clamp and fix the external cable, thereby ensuring that the external cable will not loosen or fall off due to vibration or movement in a complex outdoor environment. Through such a design, the main circuit of the present invention not only realizes efficient power transmission and heat dissipation, but also significantly improves the maintenance convenience and operational reliability of the equipment, providing a solid guarantee for the application of frequency converter cabinets in harsh environments.

[0042] In this embodiment, the design of the independent air duct of the frequency converter cabinet solves the problem of equipment heat dissipation and improves the operating stability and reliability of the equipment in complex power changes. The air inlet 1-1 of the air duct is set at the lower part of the front of the frequency converter cabinet, adopts a wavy structure design, and a dust filter cotton device is installed at the air inlet 1-1. The combination of the wavy structure and the dust filter cotton can not only effectively prevent water droplets from entering the interior of the frequency converter cabinet, thereby achieving a waterproof effect, but also can filter impurities such as dust and sand in the air to ensure that the airflow entering the frequency converter cabinet is clean.

[0043] Three fans are installed in the middle of the air duct, and the fans are arranged to form a stable and efficient air circulation. After the air enters from the air inlet 1-1, it flows through the main heat source components in the independent air duct 1 cavity in sequence, including the input inductor 1-2, the output inductor 1-3, the IGBT module 2-4 and the heat sink of the rectifier diode 2-2. The radiator fits tightly to the relevant components, and through the thermal conductive design, the heat generated during the operation of the components is quickly transferred to the air flow in the air duct. The airflow flows along the designed path inside the air duct, gradually taking the heat away from the core area of ​​the frequency converter cabinet, and finally discharged from the air outlet at the upper rear of the frequency converter cabinet. The position of the air inlet and outlet design effectively prevents the phenomenon of hot air backflow.

[0044] In this embodiment, in the design of other functional areas of the frequency converter cabinet, each functional chamber can operate independently through modularization. The independent design of the common chamber 5 for the energy meter and telemeter can avoid the decrease in the accuracy of measurement and signal transmission due to strong electrical interference; the independent chamber design of the insulation detector chamber 6 is not only convenient for maintenance, but also can effectively prevent the electromagnetic interference generated by other components during operation from affecting the detection accuracy; the first wiring terminal is configured in the external output terminal row chamber 7, and the modular terminal design makes wiring easier; the independent design of the display chamber 8 enables users to complete most operations and monitoring tasks without frequently opening the main chamber, which improves the usability and maintenance efficiency of the equipment.

[0045] In this embodiment, the frequency converter cabinet is designed by functional zoning to physically isolate the strong current part and the weak current part. The strong current part includes the main chamber 2 of the power device and the independent air duct 1. The weak current part includes the common chamber 5 for the electric energy meter and the telemeter, the display chamber 8 and the insulation detector chamber 6. Through physical isolation, the stability and accuracy of weak current signal transmission are ensured. The operator can complete the operation and maintenance of the weak current part without direct contact with the strong current part, and each area is independently distributed, and the operation and maintenance of strong and weak current do not interfere with each other.

[0046] The present invention adopts the upper-in-upper-out wiring method, avoiding many disadvantages of the traditional lower-in-downer-out wiring method, improving operating efficiency and conforming to ergonomics. The independent air duct design effectively solves the heat dissipation problem. Its unique air inlet structure is waterproof and dustproof, ensuring internal cleanliness. The fan and radiator cooperate to ensure efficient heat discharge and prevent hot air from flowing back, thereby improving the operating stability and reliability of the equipment in complex environments. The modular layout of the functional area design, such as the shared cavity for the electric energy meter and the telemeter, the insulation detector cavity, the external output terminal row cavity and the display cavity, enables each cavity to operate independently to avoid interference, thereby improving measurement accuracy, maintenance convenience and ease of use. Functional zoning realizes physical isolation of strong and weak electricity, ensures the stability of weak current signals, and is safe and convenient for operators to operate. It solves the problems of easy damage to the sealing of traditional frequency conversion cabinets, inconvenient wiring, and low reliability, and enhances the reliability, ease of use and operating efficiency of the equipment in complex environments.

[0047] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0048] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A submersible electric pump frequency conversion cabinet, wherein an RST inlet wiring chamber (3) is arranged at the left rear, and a UVW outlet wiring chamber (4) is arranged at the right rear, which are symmetrically distributed with the RST inlet wiring chamber (3), characterized in that: The frequency conversion cabinet adopts a top-in and top-out wiring method, and an independent air duct (1) is arranged at the bottom of the frequency conversion cabinet; a power device main chamber (2) is arranged at the upper position of the frequency conversion cabinet; a common chamber (5) for an electric energy meter and a telemeter is located at the upper right of the frequency conversion cabinet and is connected to the power device main chamber (2) via a signal line; an insulation detector chamber (6) monitors the circuit insulation state in real time and is located in the right middle of the frequency conversion cabinet; an external output terminal row chamber (7) is placed in parallel with the insulation detector chamber (6); a display chamber (8) is installed at the upper part of the frequency conversion cabinet, and the display chamber (8) is connected to the power device main chamber (2) and the electric energy meter. and a common cavity (5) of a telemeter through a signal line; an external output terminal row cavity (7) is connected to a main cavity (2) of a power device and a display cavity (8) through a signal line, and the external output terminal row cavity (7) has a built-in first wiring terminal (7-1); the frequency conversion cabinet is designed by functional zoning to physically isolate a strong current part from a weak current part, the strong current part comprising an independent air duct (1), a main cavity (2) of a power device, an RST incoming wiring cavity (3), and a UVW outgoing wiring cavity (4); the weak current part comprises a common cavity (5) of an electric energy meter and a telemeter, a display cavity (8), and an insulation detector cavity (6).

2. A submersible electric pump frequency conversion cabinet according to claim 1, characterized in that The independent air duct (1) is provided with an air inlet (1-1), an input reactor (1-2), an output reactor (1-3), an IGBT heat sink (1-4), a rectifier diode heat sink (1-5) and an air outlet (1-6). The air inlet (1-1) is located at the lower part of the frequency conversion cabinet and adopts a wavy structure and a dust filter cotton design. The air outlet (1-6) is located at the upper rear part of the frequency conversion cabinet.

3. A submersible electric pump frequency conversion cabinet according to claim 1, characterized in that The power device main chamber (2) is connected to the input reactor (1-2) and the output reactor (1-3) in the independent air duct (1) through a copper busbar. A circuit breaker (2-1) is provided in the upper middle part of the power device main chamber (2), and a rectifier diode (2-2) is provided in the middle part. The rectifier diode (2-2) is connected to the capacitor (2-3) located in the lower middle part of the power device main chamber (2) through a copper busbar. An IGBT module (2-4) is provided in the lower part of the power device main chamber (2), and the IGBT module (2-4) is connected to the independent air duct (1) through an IGBT heat sink (1-4).

4. A submersible electric pump frequency conversion cabinet according to claim 1, characterized in that: The RST incoming wiring chamber (3) is connected to the circuit breaker (2-1) of the power device main chamber (2) via a copper busbar, a first copper wiring terminal (3-1) is provided on the upper part of the RST incoming wiring chamber (3), and a first hexagon socket set screw (3-2) is provided next to the first copper wiring terminal (3-1).

5. The submersible electric pump frequency conversion cabinet according to claim 1, characterized in that: The UVW outgoing wiring cavity (4) is connected to the power device main cavity (2) via a copper busbar, a second copper wiring terminal (4-1) is provided on the upper part of the UVW outgoing wiring cavity (4), and a second hexagon socket set screw (4-2) is provided next to the second copper wiring terminal (4-1).

6. A submersible electric pump frequency conversion cabinet according to claim 1, characterized in that: The common cavity (5) of the electric energy meter and the telemeter is connected to the main cavity (2) of the power device via a signal line; an electric energy meter (5-1) is provided in the middle of the common cavity (5) of the electric energy meter and the telemeter, and a telemeter (5-2) is provided near the electric energy meter (5-1).

7. A submersible electric pump frequency conversion cabinet according to claim 1, characterized in that: An insulation detector (6-1) is provided in the middle of the insulation detector cavity (6), and the insulation detector cavity (6) further comprises a second wiring terminal (6-2).

8. The submersible electric pump frequency conversion cabinet according to claim 1, characterized in that: The display cavity (8) is connected to the main cavity (2) of the power device and the common cavity (5) of the electric energy meter and telemeter via a signal line; a touch screen (8-1) is provided in the center of the display cavity (8); a keyboard (8-2) is provided near the touch screen (8-1); an air switch (8-3) is provided below the keyboard (8-2); four indicator lights (8-4), (8-5), (8-6), and (8-7) are provided on the upper part of the display cavity (8); and a circuit breaker switch wrench (8-8) is also provided in the display cavity (8).

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