Electric control cabinet and magnetic suspension compressor unit

Abstract

The utility model discloses an electric control cabinet and a magnetic suspension compressor unit. The whole electric control cabinet is a sealed cabinet; the frequency conversion device is arranged in the left side area in the cabinet body; the magnetic suspension control device is arranged in the middle area in the cabinet body; the programmable control device is arranged in the right side area in the cabinet body; the heat dissipation device comprises a first pipeline and a second pipeline. The first pipeline is used for heat dissipation of the frequency conversion device. The second pipeline is arranged in the right side area in the cabinet body and used for heat dissipation in the cabinet body. The frequency conversion device, the magnetic levitation control device, the programmable logic control device and the heat dissipation device are arranged in the cabinet body, control over the magnetic levitation compressor is achieved through the frequency conversion device, the magnetic levitation control device and the programmable logic control device, arrangement of related electric control components is more regular and ordered, the space design can be simplified, the space utilization rate can be increased, and the service life of the magnetic levitation compressor is prolonged. And the development difficulty of the magnetic suspension compressor unit can be reduced, later maintenance of the magnetic suspension compressor unit is facilitated, and popularization of the magnetic suspension compressor unit is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration, and in particular to an electrical control cabinet and a magnetic levitation compressor unit. Background Technology

[0002] Magnetic levitation compressors utilize magnetic bearings and magnetic levitation drive technology to achieve a contactless and frictionless operation. Compared to traditional mechanical bearings and transmission systems, magnetic levitation compressors have no mechanical friction, require no lubrication, experience less vibration, and offer higher efficiency, lower energy consumption, and are more environmentally friendly. By reducing energy consumption and improving thermal efficiency, magnetic levitation compressors can achieve higher energy utilization efficiency.

[0003] Currently, magnetic levitation compressor technology has many advantages, but there are many technical challenges in its practical application. These include the matching of parameters between the frequency converter and the permanent magnet synchronous motor, the writing of control and protection programs for the compressor, and the spatial design of the overall compressor within the unit. The scattered layout of related electrical control components seriously affects the installation and commissioning of the magnetic levitation compressor, and is also not conducive to later maintenance, thus hindering the promotion of magnetic levitation compressors. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned defects of the scattered arrangement of electrical control components in the existing magnetic levitation compressor, and to provide an electrical control cabinet and a magnetic levitation compressor unit.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] An electrical control cabinet for a magnetic levitation compressor unit includes: a cabinet body, a frequency converter, a magnetic levitation control device, a programmable logic controller (PLC) device, and a heat dissipation device. The cabinet body is entirely sealed. The frequency converter is located in the left side region inside the cabinet body; the magnetic levitation control device is located in the middle region inside the cabinet body; the PLC device is located in the right side region inside the cabinet body; the heat dissipation device includes a first pipe and a second pipe. The first pipe passes through the frequency converter and is used for heat dissipation of the frequency converter; the second pipe is located in the right side region inside the cabinet body and is used for heat dissipation of the cabinet body.

[0007] In this solution, by adopting the above structure, the frequency converter, magnetic levitation control device, programmable logic controller (PLC) device, and heat dissipation device are housed within the cabinet. The frequency converter, magnetic levitation control device, and PLC device are used to control the magnetic levitation compressor. The arrangement of related electrical control components is more organized and orderly, simplifying the spatial design of the magnetic levitation compressor unit, improving space utilization, reducing the development difficulty of the magnetic levitation compressor unit, facilitating its later maintenance, and promoting its widespread adoption. The heat dissipation device better controls the temperature inside the electrical control cabinet, improves the stability of the internal environment, optimizes the working environment of the electrical control components, and enhances the operational stability of the magnetic levitation compressor unit.

[0008] Optionally, the frequency converter, the magnetic levitation control device, and the programmable logic control device are all equipped with corresponding circuit breakers, relays, and transformers.

[0009] Optionally, the control cabinet includes an interference source and a sensitive device with cross circuits, and the transformer and the intermediate relay divide the interference source and the sensitive device into two circuits.

[0010] Optionally, a capacitor is provided on the circuit during the commissioning process.

[0011] Optionally, the control cabinet includes a data transmission line, and the shield of the data transmission line is grounded.

[0012] Optionally, a baffle is provided between the frequency converter, the magnetic levitation control device, and the programmable logic control device.

[0013] Optionally, the control cabinet includes high-voltage and low-voltage wiring, with separate wiring channels for the high-voltage and low-voltage wiring; the wiring inside and outside the control cabinet is located in the middle right area of ​​the cabinet body.

[0014] Optionally, the heat dissipation device further includes a heat exchange coil and a fan, the second pipe being connected to the heat exchange coil, and the fan being used to blow air from the heat dissipation coil area to other areas inside the cabinet.

[0015] Optionally, the heat dissipation device further includes a water receiving tray for collecting water droplets condensed on the heat exchange coil.

[0016] A magnetic levitation compressor unit, the magnetic levitation compressor unit including the electrical control cabinet as described above.

[0017] In this solution, by adopting the above structure, the spatial design of the magnetic levitation compressor unit can be simplified, the space utilization rate can be improved, the development difficulty of the magnetic levitation compressor unit can be reduced, the later maintenance of the magnetic levitation compressor unit is beneficial, and the promotion of the magnetic levitation compressor unit is also beneficial.

[0018] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0019] The positive and progressive effects of this utility model are as follows:

[0020] This invention integrates a frequency converter, a magnetic levitation control device, a programmable logic controller (PLC) device, and a heat dissipation device within a cabinet. The frequency converter, magnetic levitation control device, and PLC device are used to control the magnetic levitation compressor. The arrangement of the relevant electrical control components is more organized and efficient, simplifying the spatial design of the magnetic levitation compressor unit, improving space utilization, reducing development difficulty, facilitating later maintenance, and promoting the widespread adoption of magnetic levitation compressor units. The heat dissipation device better controls the temperature inside the control cabinet, improving the stability of the internal environment, optimizing the working environment of the electrical control components, and enhancing the operational stability of the magnetic levitation compressor unit. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the electrical control cabinet in an embodiment of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100 electrical control cabinets

[0024] Cabinet 11

[0025] Variable frequency drive 12

[0026] Heat dissipation device 13

[0027] First pipeline 131

[0028] Second pipeline 132

[0029] Heat exchanger coil 133

[0030] Fan 134

[0031] Water tray 135 Detailed Implementation

[0032] The present invention will be described more clearly and completely below by way of embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0033] like Figure 1As shown, this embodiment includes an electrical control cabinet 100 and a magnetic levitation compressor unit. The use of the electrical control cabinet 100 for the magnetic levitation compressor unit can simplify the spatial design of the magnetic levitation compressor unit, improve space utilization, reduce the development difficulty of the magnetic levitation compressor unit, facilitate the later maintenance of the magnetic levitation compressor unit, and promote the promotion of the magnetic levitation compressor unit.

[0034] Combination Figure 1 The electrical control cabinet 100 includes: a cabinet 11, a frequency converter 12, a magnetic levitation control device, a programmable logic controller (PLC) device, and a heat dissipation device 13. The cabinet 11 is a sealed cabinet. The frequency converter 12 is located in the left side of the cabinet 11. The magnetic levitation control device is located in the middle of the cabinet 11. The PLC device is located in the right side of the cabinet 11. The heat dissipation device 13 includes a first pipe 131 and a second pipe 132. The first pipe 131 passes through the frequency converter 12 and is used for heat dissipation of the frequency converter 12. The second pipe 132 is located in the right side of the cabinet 11 and is used for heat dissipation inside the cabinet 11. By housing the frequency converter 12, magnetic levitation control device, programmable logic controller (PLC) device, and heat dissipation device 13 within the cabinet 11, and utilizing these components to control the magnetic levitation compressor, the arrangement of related electrical control components becomes more organized and efficient. This simplifies the spatial design of the magnetic levitation compressor unit, improves space utilization, reduces development complexity, facilitates future maintenance, and promotes its widespread adoption. The heat dissipation device 13 better controls the internal temperature of the control cabinet 100, enhancing the stability of the internal environment and optimizing the working environment of the electrical control components, thereby improving the operational stability of the magnetic levitation compressor unit.

[0035] In one implementation, the frequency converter 12 can be a power control device whose main function is to control the speed and direction of the AC motor by adjusting the frequency of the motor's operating power supply, thereby realizing the motor's start-up, shutdown, and speed regulation. In the magnetic levitation compressor, the frequency converter 12 is used to adjust the speed of the magnetic levitation compressor to meet different load requirements and improve the system's efficiency and stability.

[0036] The magnetic levitation controller is responsible for controlling the operating status of the magnetic levitation bearing. It supports and positions the rotor using precisely controlled electromagnetic fields, ensuring smooth rotor rotation without mechanical contact. The magnetic levitation controller eliminates friction and wear between the rotor and bearing, reducing energy loss and extending equipment life.

[0037] A Programmable Logic Controller (PLC) is a highly programmable controller that controls various devices and systems by writing programs. In magnetic levitation compressor units, the PLC can be used for overall system control and monitoring, including functions such as start-up, stop, and fault diagnosis. It can make logical judgments and execute corresponding operations based on the system's operating status, ensuring the safe and stable operation of the system.

[0038] In this example, the frequency converter 12, the magnetic levitation control device, and the programmable logic control device are all equipped with corresponding circuit breakers, relays, and transformers. The control cabinet includes interference sources and sensitive devices with cross-circuit connections; the transformer and intermediate relays divide the interference sources and sensitive devices into two circuits. Capacitors can also be installed on the circuits during commissioning.

[0039] In one implementation, the control cabinet includes a data transmission line, and the shield of the data transmission line is grounded.

[0040] In other examples, a baffle is provided between the frequency converter 12, the magnetic levitation control device, and the programmable logic controller. The control cabinet includes high-voltage and low-voltage wiring, with separate cable trays for the high-voltage and low-voltage wiring; both internal and external wiring within the control cabinet are located in the middle right side area inside the cabinet 11.

[0041] exist Figure 1 The heat dissipation device 13 also includes a heat exchange coil 133 and a fan 134. A second pipe 132 is connected to the heat exchange coil 133, and the fan 134 is used to blow air from the heat dissipation coil area to other areas inside the cabinet 11. The heat dissipation device 13 also includes a water collection tray 135, which is used to collect water droplets condensed on the heat exchange coil 133.

[0042] In this example, the electrical control cabinet 100 integrates all electrical components related to the operation of the magnetic levitation compressor. Only one cabinet 100 is needed to drive and protect the magnetic levitation compressor, significantly saving installation space. Furthermore, the neat and orderly arrangement of the main components facilitates easy troubleshooting. By integrating the frequency converter 12, the magnetic levitation controller, and the PLC into the three-in-one cabinet 100, the frequency converter 12 can be optimally configured, and the PLC, containing compressor control and protection logic, can be used directly without additional magnetic levitation debugging or complex programming, enabling the magnetic levitation compressor to operate normally and facilitating rapid development. All the driving, control, and protection functions of the magnetic levitation compressor are integrated into the three-in-one cabinet 100. Wiring positions and communication ports are reserved for the chiller main control PLC. Only the other components of the centrifuge need to be manufactured and controlled separately, and simple commands such as start-up and loading / unloading can be issued to the three-in-one cabinet 100 to achieve the operation control of the entire centrifugal chiller unit, reducing the difficulty for the main controller in using the magnetic levitation compressor.

[0043] In this example, the electrical control cabinet 100 integrates the frequency converter 12, the magnetic levitation controller, and the PLC in terms of hardware layout, and also configures corresponding control components such as circuit breakers, relays, and transformers. The frequency converter 12 is on the left, the magnetic levitation controller is in the middle, and the PLC and cabinet heat dissipation are on the right.

[0044] The integration of multiple electromagnetic components may lead to mutual electromagnetic interference. The three-in-one electrical control cabinet 100 can address this issue when strategically arranged. For conducted interference, in cases where the interference source and sensitive equipment have intersecting circuits, the electrical control cabinet 100 can be designed to separate the interference source and sensitive equipment into two separate circuits using isolation transformers and intermediate relays. Simultaneously, the shielding of the data transmission lines is properly grounded, and small-capacity capacitors are added to the circuits during commissioning to resolve the aforementioned interference problems. For radiated interference, the electrical control cabinet 100 allows for a reasonable arrangement of the frequency converter 12, the magnetic levitation control device, and the PLC, with baffles placed between them.

[0045] The electrical control cabinet contains many interfering components. When wiring, strong and weak current wires can be separated into different cable trays. Control wires can be twisted-pair shielded wires. All external connections are concentrated in the middle right side of the cabinet. The overall wiring is neat and orderly, making it easy to find problems.

[0046] The components inside the electrical control cabinet 100 are cooled by the heat dissipation device 13. The electrical control cabinet 100 is a completely enclosed cabinet, with no air flow to the external environment, providing a high level of protection. The heat dissipation device 13 can employ a dual-pipe cooling scheme using refrigerant sourced from a centrifugal chiller. The temperature can be precisely controlled within a suitable range by a PLC. The first pipe 131 is used to cool the frequency converter 12, passing directly through the back of the frequency converter 12. An electronic expansion valve can be installed to control the flow rate, and the PLC uses a PID algorithm to precisely control the opening of the electronic expansion valve. The second pipe 132 passes through the heat exchange coil 133, and a fan 134 blows the cooled air onto other components inside the control cabinet. A solenoid valve can be installed on the second pipe 132 to control its on / off state. The heat dissipation device 13 effectively reduces the temperature of the frequency converter 12 and its main components, while simultaneously condensing water vapor inside the electrical control cabinet 100 onto the water collection pan 135 of the heat exchange coil 133, maintaining a dry environment inside the cabinet.

[0047] The programmable logic controller (PLC) device within the electrical control cabinet 100 can control and debug the protection program for the magnetic levitation compressor. The PLC device contains all the control and protection logic for the magnetic levitation compressor, eliminating the need for additional detailed control logic and programming. It can thus provide reasonable control and robust protection for the magnetic levitation compressor. The PLC device can also reserve a Modbus communication interface to read important signals or write target speeds, effectively saving development time and manpower costs for centrifugal chiller units.

[0048] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. An electrical control cabinet for a magnetic levitation compressor unit, characterized in that, The electrical control cabinet includes: The cabinet is a sealed cabinet as a whole; A frequency converter is located in the left-side area inside the cabinet. A magnetic levitation control device is located in the middle area inside the cabinet. A programmable logic control device, wherein the programmable logic control device is located in the right side area inside the cabinet; A heat dissipation device includes a first pipe and a second pipe. The first pipe passes through the frequency converter and is used for heat dissipation of the frequency converter. The second pipe is located in the right side area inside the cabinet and is used for heat dissipation inside the cabinet.

2. The electrical control cabinet as described in claim 1, characterized in that, The frequency converter, the magnetic levitation control device, and the programmable logic control device are all equipped with corresponding circuit breakers, relays, and transformers.

3. The electrical control cabinet as described in claim 2, characterized in that, The electrical control cabinet includes an interference source and a sensitive device with cross circuits. The transformer and the relay divide the interference source and the sensitive device into two circuits.

4. The electrical control cabinet as described in claim 3, characterized in that, During the debugging process, a capacitor is installed on the circuit.

5. The electrical control cabinet as described in claim 2, characterized in that, The electrical control cabinet includes a data transmission line, and the shield of the data transmission line is grounded.

6. The electrical control cabinet as described in claim 2, characterized in that, A baffle is provided between the frequency converter, the magnetic levitation control device, and the programmable logic control device.

7. The electrical control cabinet as described in claim 1, characterized in that, The electrical control cabinet includes high-voltage and low-voltage wiring, with separate wiring channels for the high-voltage and low-voltage wiring; the wiring inside and outside the electrical control cabinet is located in the middle right area of ​​the cabinet body.

8. The electrical control cabinet as described in claim 1, characterized in that, The heat dissipation device also includes a heat exchange coil and a fan. The second pipe is connected to the heat exchange coil, and the fan is used to blow air from the heat dissipation coil area to other areas inside the cabinet.

9. The electrical control cabinet as described in claim 8, characterized in that, The heat dissipation device also includes a water receiving tray, which is used to collect water droplets condensed on the heat exchange coil.

10. A magnetic levitation compressor unit, characterized in that, The magnetic levitation compressor unit includes the electrical control cabinet as described in any one of claims 1-9.

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