An explosion-proof intelligent variable frequency constant current power supply cabinet

Abstract

The application relates to the technical field of power supply cabinets, in particular to an explosion-proof intelligent variable-frequency constant-current power supply cabinet, which comprises an explosion-proof cabinet and two vertically arranged signal shielding plates, the top of the signal shielding plates is connected to the top of the explosion-proof cabinet, the bottom of the signal shielding plates is connected to the bottom of the explosion-proof cabinet, the two signal shielding plates are arranged in parallel and are spaced apart, and an isolation chamber is formed between the two signal shielding plates in the explosion-proof cabinet, the signal shielding plates are provided with holes for cables to penetrate, and the isolation chamber is used for mounting a CPU mainboard, a variable-frequency power supply controller, an IGBT driving plate and an SCR control module. The explosion-proof intelligent variable-frequency constant-current power supply cabinet can shield most external interference signals, so that the CPU mainboard, the variable-frequency power supply controller, the IGBT driving plate and the SCR control module and other core control parts in the isolation chamber can normally operate, the performance is more stable, faults are less likely to occur during operation, and problems such as tripping and shutdown are less likely to occur.

Description

Technical Field

[0001] This application relates to the field of power cabinet technology, and in particular to an explosion-proof intelligent frequency conversion constant current power cabinet. Background Technology

[0002] Explosion-proof dust collector power supply cabinet is a high-efficiency power supply device for industrial dust collection systems in explosion-proof scenarios. Its core objective is to stably control the electric field current, adapt to complex explosion-proof working conditions, and achieve energy saving and consumption reduction.

[0003] For example, Chinese patent application number CN 202020990524.0 discloses a high-power high-voltage frequency converter control cabinet for high-voltage electrostatic dust removal, including a cabinet body. A front door is fixedly installed at the front end of the cabinet body, and a control box fixing hole is fixedly installed on the front door. A rear door is fixedly installed at the rear end of the cabinet body. A main cooling fan is fixedly installed at one end of the cabinet body. An IGBT is fixedly installed on the front side of the inner panel of the cabinet body near the main cooling fan. A rectifier bridge is installed at the end of the IGBT away from the main cooling fan. A heat sink is installed at the end of the rectifier bridge away from the IGBT. A stacked copper busbar is installed above the IGBT. A smoothing capacitor is installed on the stacked copper busbar. An auxiliary capacitor is fixedly installed at the end of the stacked copper busbar away from the main cooling fan. The auxiliary cooling fan has a circuit breaker at the end of the radiator away from the rectifier bridge, and an auxiliary electrical component at the end of the circuit breaker away from the radiator. A current transformer is fixedly installed on the rear side of the inner panel of the cabinet near the main cooling fan. A pre-charge controller is installed on the side of the current transformer away from the main cooling fan. A reactor is fixedly installed at the end of the pre-charge controller away from the current transformer. An input terminal a is located on the side of the reactor away from the pre-charge controller. An input terminal b is located below input terminal a. An input terminal c is located below input terminal b. An output terminal d is located below input terminal c. An output terminal f is located below output terminal d.

[0004] Regarding the aforementioned technologies, the inventors believe that the following technical defects exist and require improvement:

[0005] The CPU motherboard, frequency converter controller, IGBT driver board, and SCR control module are the core control components in the frequency converter control cabinet. During operation, they are easily affected by interference signals generated by other electrical modules, which can lead to unstable performance, malfunctions during operation, and tripping shutdowns. Utility Model Content

[0006] This application provides an explosion-proof intelligent variable frequency constant current power supply cabinet to improve the following technical problems:

[0007] The CPU motherboard, frequency converter controller, IGBT driver board, and SCR control module are the core control components in the frequency converter control cabinet. During operation, they are easily affected by interference signals generated by other electrical modules, which can lead to unstable performance, malfunctions during operation, and tripping shutdowns.

[0008] This application provides an explosion-proof intelligent variable frequency constant current power supply cabinet, which adopts the following technical solution:

[0009] An explosion-proof intelligent variable frequency constant current power supply cabinet includes an explosion-proof cabinet and two vertically arranged signal shielding plates. The top of the signal shielding plates is connected to the top of the explosion-proof cabinet, and the bottom of the signal shielding plates is connected to the bottom of the explosion-proof cabinet. The two signal shielding plates are arranged in parallel and spaced apart, forming an isolation chamber between them within the explosion-proof cabinet. The signal shielding plates are provided with holes for cables to pass through. The isolation chamber is used to install a CPU motherboard, a variable frequency power controller, an IGBT driver board, and an SCR control module.

[0010] In one feasible technical solution of this application, the signal shielding plate is provided with a first perforation, a second perforation, and a third perforation, all of which are oval in shape, on the central axis.

[0011] In one feasible technical solution of this application, the top and bottom of the signal shielding plate are vertically fixed with connecting plates, and the connecting plates are attached to the inner top wall or inner bottom wall of the explosion-proof cabinet.

[0012] In one feasible technical solution of this application, the connecting plate and the inner wall of the explosion-proof cabinet are detachably assembled by multiple bolts.

[0013] In one feasible technical solution of this application, the signal shielding plate includes a nickel-containing carbon fiber core plate and a shielding coating layer, wherein the shielding coating layer is disposed on two sides of the nickel-containing carbon fiber core plate.

[0014] In one feasible technical solution of this application, a core chamber is formed between one of the signal shielding plates and one inner wall of the explosion-proof cabinet. The core chamber is used to install an electrostatic precipitator, a disconnecting switch, an intermediate frequency transformer, an IGBT inverter, a three-phase fully controlled rectifier module, a filter, and terminals.

[0015] In one feasible technical solution of this application, an auxiliary chamber is formed between another signal shielding plate and the inner wall of the other side of the explosion-proof cabinet. The auxiliary chamber is used to install a network switch and a temperature monitoring module.

[0016] In one feasible technical solution of this application, at least one cooling fan is provided in each of the core chamber, the isolation chamber, and the auxiliary chamber.

[0017] In one feasible technical solution of this application, the outer surface of the explosion-proof cabinet is treated with electrostatic powder spraying to form a corrosion-resistant coating.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] The explosion-proof cabinet itself is made of high-strength carbon steel or stainless steel, welded and machined, making it not only sturdy and reliable but also with excellent signal shielding. Combined with two additional signal shielding plates inside, an isolation chamber is formed within the cabinet. This chamber can shield most external interference signals, thus facilitating the normal operation of core control components such as the CPU motherboard, frequency converter controller, IGBT driver board, and SCR control module. This results in more stable performance, reducing the likelihood of malfunctions and tripping / shutdowns during operation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a structural schematic diagram of an explosion-proof intelligent variable frequency constant current power supply cabinet according to an embodiment of this application.

[0022] Figure 2 This is a side view of the signal shielding plate in an embodiment of this application.

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the signal shielding plate in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Explosion-proof cabinet; 11. Isolation chamber; 12. Core chamber; 13. Auxiliary chamber; 2. Signal shielding plate; 21. First perforation; 22. Second perforation; 23. Third perforation; 24. Connecting plate; 25. Nickel carbon fiber core plate; 26. Shielding coating layer; 100. CPU motherboard; 101. Variable frequency power controller; 102. IGBT driver board; 103. SCR control module; 104. Electrostatic precipitator; 105. Disconnecting switch; 106. Intermediate frequency transformer; 107. IGBT inverter; 108. Three-phase fully controlled rectifier module; 109. Filter; 110. Terminal block; 111. Network switch; 112. Temperature monitoring module; 113. Cooling fan. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0028] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses an explosion-proof intelligent variable frequency constant current power supply cabinet. (Refer to...) Figure 1-3An explosion-proof intelligent variable frequency constant current power supply cabinet includes an explosion-proof cabinet 1 and two vertically arranged signal shielding plates 2. The top of the signal shielding plates 2 is connected to the top of the explosion-proof cabinet 1, and the bottom of the signal shielding plates 2 is connected to the bottom of the explosion-proof cabinet 1. The two signal shielding plates 2 are arranged in parallel and spaced apart, and an isolation chamber 11 is formed between them in the explosion-proof cabinet 1. The signal shielding plates 2 are provided with holes for cables to pass through. The isolation chamber 11 is used to install a CPU motherboard 100, a variable frequency power controller 101, an IGBT driver board 102, and an SCR control module 103. The outer surface of the explosion-proof cabinet 1 is treated with electrostatic powder coating to form a corrosion-resistant coating.

[0032] In this embodiment, the signal shielding plate 2 has a first through hole 21, a second through hole 22, and a third through hole 23, all of which are oval in shape, on its central axis. The top and bottom of the signal shielding plate 2 are vertically fixed with connecting plates 24. The connecting plates 24 are attached to the inner top wall or inner bottom wall of the explosion-proof cabinet 1. The connecting plates 24 and the inner wall of the explosion-proof cabinet 1 are detachably assembled by multiple bolts. The signal shielding plate 2 includes a nickel-containing carbon fiber core plate 25 and a shielding coating layer 26. The shielding coating layer 26 is provided on the two sides of the nickel-containing carbon fiber core plate 25.

[0033] The signal shielding plate 2 and its installation method described above not only ensure that the signal shielding plate 2 is firmly installed, but also have a good signal shielding effect and the advantage of being lightweight.

[0034] In this embodiment, a core chamber 12 is formed between one of the signal shielding plates 2 and one inner wall of the explosion-proof cabinet 1. The core chamber 12 is used to install an electrostatic precipitator 104, a disconnecting switch 105, an intermediate frequency transformer 106, an IGBT inverter 107, a three-phase fully controlled rectifier module 108, a filter 109, and a terminal block 110. An auxiliary chamber 13 is formed between the other signal shielding plate 2 and the other inner wall of the explosion-proof cabinet 1. The auxiliary chamber 13 is used to install a network switch 111 and a temperature monitoring module 112. At least one cooling fan 113 is provided in each of the core chamber 12, the isolation chamber 11, and the auxiliary chamber 13.

[0035] The explosion-proof cabinet 1 adopts the above-mentioned zoned layout, which not only facilitates cable routing but also makes the structural layout more reasonable and convenient for future maintenance. At the same time, cooling fans 113 are added to the core chamber 12, isolation chamber 11 and auxiliary chamber 13 to improve the heat dissipation effect in each chamber, which is conducive to the stable operation of each electrical component.

[0036] The beneficial technical effects of an explosion-proof intelligent variable frequency constant current power supply cabinet according to an embodiment of this application are roughly as follows:

[0037] The explosion-proof cabinet 1 itself is made of high-strength carbon steel or stainless steel, which is welded and machined. It is not only sturdy and reliable, but also has a good signal shielding effect. With the addition of two signal shielding plates 2 inside, an isolation chamber 11 is formed inside the explosion-proof cabinet 1. The isolation chamber 11 can shield most of the external interference signals, which is conducive to the normal operation of the core control components such as the CPU motherboard 100, frequency converter power controller 101, IGBT driver board 102, and SCR control module 103 inside the isolation chamber 11. The performance is more stable, and it is less likely to fail or trip and shut down during operation.

[0038] The working principle of an explosion-proof intelligent variable frequency constant current power supply cabinet according to an embodiment of this application is roughly as follows:

[0039] Three-phase fully controlled rectifier module 108: Converts three-phase AC power into DC power through fully controlled thyristor rectification, providing a foundation for subsequent inverter;

[0040] IGBT Inverter 107: Converts DC power into high-frequency modulated medium-frequency AC power using power devices such as IGBTs;

[0041] Medium frequency transformer 106: Steps up the medium frequency AC power to the high voltage (40-120kV) required for dust removal;

[0042] Variable frequency power controller 101: Real-time detection of output current, and adjustment of inverter frequency and duty cycle through feedback;

[0043] CPU Motherboard 100: Based on DSP, with integrated algorithms to optimize operating parameters.

[0044] The explosion-proof intelligent variable frequency constant current power supply cabinet of this application embodiment monitors the secondary current of the electric field in real time through Hall sensors and feeds the signal back to the CPU motherboard 100. The real-time monitored secondary current of the electric field is compared with the preset constant current value to generate an error signal. If the flue gas conditions change (such as the current decreases due to increased dust concentration), the variable frequency power controller 101 increases the frequency of the IGBT inverter 107 to increase the power transmission efficiency, maintain a constant current, has a wide frequency adjustment range, and adapts to different load impedances. In addition, the CPU motherboard 100 also controls the output voltage amplitude by adjusting the PWM duty cycle to avoid current overload in the event of electric field breakdown (flashover).

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An explosion-proof intelligent variable frequency constant current power supply cabinet, characterized in that, The device includes an explosion-proof cabinet (1) and two vertically arranged signal shielding plates (2). The top of the signal shielding plate (2) is connected to the top of the explosion-proof cabinet (1), and the bottom of the signal shielding plate (2) is connected to the bottom of the explosion-proof cabinet (1). The two signal shielding plates (2) are arranged in parallel and spaced apart, and an isolation chamber (11) is formed between them in the explosion-proof cabinet (1). The signal shielding plate (2) is provided with holes for cables to pass through. The isolation chamber (11) is used to install a CPU motherboard (100), a frequency converter power controller (101), an IGBT driver board (102), and an SCR control module (103).

2. The explosion-proof intelligent variable frequency constant current power supply cabinet according to claim 1, characterized in that, The signal shielding plate (2) has a first perforation (21), a second perforation (22), and a third perforation (23) that are all oval in shape on its central axis.

3. The explosion-proof intelligent variable frequency constant current power supply cabinet according to claim 1, characterized in that, The top and bottom of the signal shielding plate (2) are vertically fixed with connecting plates (24), and the connecting plates (24) are attached to the inner top wall or inner bottom wall of the explosion-proof cabinet (1).

4. The explosion-proof intelligent variable frequency constant current power supply cabinet according to claim 3, characterized in that, The connecting plate (24) and the inner wall of the explosion-proof cabinet (1) can be detachably assembled by multiple bolts.

5. The explosion-proof intelligent variable frequency constant current power supply cabinet according to claim 1, characterized in that, The signal shielding plate (2) includes a nickel-containing carbon fiber core plate (25) and a shielding coating layer (26), wherein the shielding coating layer (26) is disposed on two sides of the nickel-containing carbon fiber core plate (25).

6. The explosion-proof intelligent variable frequency constant current power supply cabinet according to claim 1, characterized in that, One of the signal shielding plates (2) forms a core chamber (12) between it and one inner wall of the explosion-proof cabinet (1). The core chamber (12) is used to install an electrostatic precipitator (104), a disconnecting switch (105), an intermediate frequency transformer (106), an IGBT inverter (107), a three-phase fully controlled rectifier module (108), a filter (109), and a terminal block (110).

7. The explosion-proof intelligent variable frequency constant current power supply cabinet according to claim 6, characterized in that, An auxiliary chamber (13) is formed between the other signal shielding plate (2) and the inner wall of the explosion-proof cabinet (1) on the other side. The auxiliary chamber (13) is used to install the network switch (111) and the temperature monitoring module (112).

8. The explosion-proof intelligent variable frequency constant current power supply cabinet according to claim 7, characterized in that, At least one cooling fan (113) is provided in each of the core chamber (12), the isolation chamber (11), and the auxiliary chamber (13).

9. The explosion-proof intelligent variable frequency constant current power supply cabinet according to claim 1, characterized in that, The outer surface of the explosion-proof cabinet (1) is treated with electrostatic powder spraying to form a corrosion-resistant coating.

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