A marine refrigeration compressor driving system and method based on a magnetic coupler

Abstract

The application discloses a kind of based on magnetic coupler transmission torque in midair of marine refrigeration compressor's drive system, the system includes magnetic coupler, motor, refrigeration compressor, controller and power supply, controller controls power supply to open or close, power supply is powered to motor, motor drives refrigeration compressor, magnetic coupler includes driving end rotor and load end rotor, driving end rotor is installed in motor output end, load end rotor is installed in refrigeration compressor, driving rotor end and load end rotor in refrigeration compressor are on the same axis, there is gap between motor driving rotor end and refrigeration compressor.The application realizes transmission torque in midair by applying magnetic coupler, avoids refrigerant leakage caused by the shaft seal failure of open-type refrigeration compressor to affect normal operation of equipment, the application reduces the risk of system shutdown caused by shaft seal failure by contactless torque transmission of magnetic field, improves the reliability of overall operation of marine refrigeration compressor unit.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of shipbuilding, and particularly relates to a marine refrigeration compressor driving system and method based on a magnetic coupler. BACKGROUND

[0002] Open refrigeration compressors have the advantages of simple structure, low procurement cost, low maintenance cost and high equipment reliability, and are widely used in marine refrigeration devices. However, the torque transmission of existing open refrigeration compressors usually relies on direct mechanical connection, that is, the motor is connected and torque is transmitted to the crankshaft extending outside the compressor. They cannot be completely sealed. In order to prevent refrigerant from leaking out of the compressor, a shaft seal component must be installed at the connection between the compressor and the motor to ensure sealing. However, the sealing performance of the shaft seal component is affected by temperature, pressure and the nature of the refrigerant medium, and it is difficult to achieve complete sealing in actual application. In addition, the shaft seal component needs to withstand harsh working conditions such as high-speed rotation, high temperature and high pressure, and corrosion by refrigerant during equipment operation, and its sealing performance is severely challenged. Once the shaft seal component fails, the leakage of refrigerant not only affects the normal operation of the refrigeration system, but also poses a potential threat to the environment and human body. The regular replacement and maintenance of the shaft seal component require high professional skills, which not only increases the operating cost of the ship, but also reduces the reliability of the refrigeration system. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art and provide a marine refrigeration compressor driving system and method based on a magnetic coupler. The present application achieves torque transmission through the application of a magnetic coupler, avoiding the refrigerant leakage caused by the failure of the shaft seal of the open refrigeration compressor, which affects the normal operation of the equipment. The present application reduces the risk of system downtime caused by shaft seal failure through non-contact torque transmission of the magnetic field, and improves the overall reliability of the marine refrigeration compressor unit.

[0004] In order to achieve the above-mentioned application purpose, the technical solution provided by the present application patent is as follows:

[0005] A marine refrigeration compressor driving system based on magnetic coupler for air transmission of torque, the system comprises a magnetic coupler, a motor, a refrigeration compressor, a controller and a power supply, the controller controls the power supply to turn on or off, the power supply supplies power to the motor, the motor drives the refrigeration compressor, the magnetic coupler comprises a driving end rotor and a load end rotor, the driving end rotor is installed at the output end of the motor, and the load end rotor is installed in the refrigeration compressor, the driving end rotor and the load end rotor in the refrigeration compressor are on the same axis, and there is a gap between the motor driving end rotor and the refrigeration compressor.

[0006] Further, the motor output end and the driving end rotor are fixedly connected through a shaft coupling.

[0007] Further, one end of the crankshaft in the refrigeration compressor is provided with the load end rotor, the load end rotor is fixedly connected with the crankshaft through a shaft coupling, and the one end of the crankshaft provided with the load end rotor is close to the motor output end.

[0008] Further, a shell is arranged outside the refrigeration compressor, the shell wraps the refrigeration compressor, and the shell is made of an aluminum alloy material with super-low magnetic permeability.

[0009] A driving method of a marine refrigeration compressor based on a magnetic coupling, which specifically comprises the following steps:

[0010] S1, preparing a driving system of a marine refrigeration compressor based on a magnetic coupling for transmitting torque in space, the system comprising a magnetic coupling, a motor, a refrigeration compressor, a controller and a power supply, the controller controls the power supply to be turned on or off, the power supply supplies power to the motor, the motor drives the refrigeration compressor, the magnetic coupling comprises a driving end rotor and a load end rotor, the driving end rotor is installed on the motor output end, the load end rotor is installed in the refrigeration compressor, the driving end rotor and the load end rotor in the refrigeration compressor are on the same axis, and there is a gap between the motor driving end rotor and the refrigeration compressor;

[0011] S2, after the driving end rotor on the motor output end and the load end rotor in the refrigeration compressor are installed, the driving end rotor on the motor output end and the load end rotor in the refrigeration compressor are adjusted to be on the same axis;

[0012] S3, the power supply supplies power to the motor through the controller, the motor output end drives the driving end rotor to rotate, the principle of transmitting torque in space through the magnetic coupling is used, the driving end rotor drives the load end rotor at the end of the crankshaft in the refrigeration compressor to rotate, so that the refrigeration compressor works, and the driving of the refrigeration compressor is completed.

[0013] Based on the above technical scheme, the marine refrigeration compressor driving system and driving method based on the magnetic coupling have the following technical advantages after practical application:

[0014] 1. The marine refrigeration compressor driving system based on the magnetic coupling realizes the transmission of torque in space through the application of the magnetic coupling, avoids the refrigerant leakage caused by the failure of the open refrigeration compressor shaft seal, and affects the normal operation of the equipment. The present application realizes the non-contact torque transmission of the magnetic field, reduces the risk of system shutdown caused by shaft seal failure, and improves the reliability of the overall operation of the marine refrigeration compressor unit.

[0015] 2. The marine refrigeration compressor driving system based on a magnetic coupling realizes the transmission of torque in the air by applying a magnetic coupling, and there is no mechanical contact in the process of torque transmission, so that the maintenance requirement caused by shaft seal wear is eliminated, and the maintenance process and workload are simplified. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a driving system structure diagram in the marine refrigeration compressor driving system based on a magnetic coupling. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application will be described below through specific examples shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0018] As Figure 1 described, the present application belongs to a marine refrigeration compressor driving system based on a magnetic coupling for transmitting torque in the air, which comprises a magnetic coupling, a motor 5, a refrigeration compressor 2, a controller 6 and a power supply 7. The controller 6 is used to control the power supply 7 to be turned on or off by using Siemens SIMATIC S7-1500. The power supply 7 supplies power to the motor 5. The motor 5 drives the refrigeration compressor 2. The magnetic coupling comprises a driving end rotor 4 and a load end rotor 1. The driving end rotor 4 is installed at the output end of the motor 5, and the load end rotor 1 is installed in the refrigeration compressor 2. The driving end rotor and the load end rotor 1 in the refrigeration compressor 2 are on the same axis, and there is a gap between the driving end rotor of the motor 5 and the refrigeration compressor 2. The transmission of torque in the air is realized by applying a magnetic coupling, which avoids the refrigerant leakage caused by the failure of the shaft seal of the open-type refrigeration compressor 2, thereby affecting the normal operation of the equipment. The present application reduces the risk of system shutdown caused by shaft seal failure through non-contact torque transmission of the magnetic field, and improves the reliability of the overall operation of the marine refrigeration compressor 2 group.

[0019] The output end of the motor 5 and the driving end rotor 4 are fixedly connected through a shaft coupling.

[0020] One end of the crankshaft 3 in the refrigeration compressor 2 is installed with the load end rotor 1, and the load end rotor 1 is fixedly connected with the crankshaft 3 through a shaft coupling. The one end of the crankshaft 3 provided with the load end rotor 1 is close to the output end of the motor 5. The connection mode of the output end of the motor 5 and the driving end rotor 4, and the crankshaft 3 and the load end rotor 1 can also be connected by mechanical connection or other transmission components.

[0021] The refrigeration compressor 2 is externally provided with a housing, which encloses the refrigeration compressor 2. The housing is made of aluminum alloy with ultra-low magnetic permeability. The use of aluminum alloy with ultra-low magnetic permeability reduces the interference of the magnetic field of the magnetic coupler on both sides of the housing, thus meeting the normal operation requirements of the refrigeration compressor 2.

[0022] A driving method for a marine refrigeration compressor based on a magnetic coupler, the method specifically includes the following steps:

[0023] S1. Prepare a drive system for a marine refrigeration compressor that transmits torque remotely via a magnetic coupler. The system includes a magnetic coupler, a motor 5, a refrigeration compressor 2, a controller 6, and a power supply 7. The controller 6 controls the power supply 7 to turn on or off. The power supply 7 supplies power to the motor 5. The motor 5 drives the refrigeration compressor 2. The magnetic coupler includes a drive-end rotor 4 and a load-end rotor 1. The drive-end rotor 4 is installed at the output end of the motor 5. The load-end rotor 1 is installed inside the refrigeration compressor 2. The drive-end rotor and the load-end rotor 1 inside the refrigeration compressor 2 are on the same axis. There is a gap between the drive-end rotor of the motor 5 and the refrigeration compressor 2.

[0024] S2, After the drive end rotor 4 at the output end of motor 5 and the load end rotor 1 in refrigeration compressor 2 are installed, adjust the drive end rotor 4 at the output end of motor 5 and the load end rotor 1 in refrigeration compressor 2 to be on the same axis.

[0025] S3, the controller 6 controls the power supply 7 to supply power to the motor 5. The output end of the motor 5 drives the drive end rotor 4 to rotate. Through the principle of transmitting torque in the air through the magnetic coupler, the drive end rotor 4 drives the load end rotor 1 encapsulated in the crankshaft 3 inside the refrigeration compressor 2 to rotate, so that the refrigeration compressor 2 works and completes the drive of the refrigeration compressor 2.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A drive system for a marine refrigeration compressor based on a magnetic coupler for remote torque transmission, characterized in that, The system includes a magnetic coupler, a motor, a refrigeration compressor, a controller, and a power supply. The controller controls the power supply to be turned on or off, the power supply supplies power to the motor, and the motor drives the refrigeration compressor. The magnetic coupler includes a drive-end rotor and a load-end rotor. The drive-end rotor is installed at the output end of the motor, and the load-end rotor is installed inside the refrigeration compressor. The drive-end rotor and the load-end rotor inside the refrigeration compressor are on the same axis, and there is a gap between the motor drive rotor end and the refrigeration compressor. The motor output end and the drive end rotor are fixedly connected by a coupling. The crankshaft inside the refrigeration compressor is equipped with a load-end rotor at one end. The load-end rotor is fixedly connected to the crankshaft via a coupling. The crankshaft end equipped with the load-end rotor is close to the motor output end. The refrigeration compressor is surrounded by a housing, which encloses the compressor. The housing is made of aluminum alloy with ultra-low magnetic permeability.

2. A driving method for a marine refrigeration compressor based on a magnetic coupler, characterized in that, The method specifically includes the following steps: S1, Prepare a drive system for a marine refrigeration compressor that transmits torque remotely via a magnetic coupler. The system includes a magnetic coupler, a motor, a refrigeration compressor, a controller, and a power supply. The controller controls the power supply to be turned on or off. The power supply supplies power to the motor. The motor drives the refrigeration compressor. The magnetic coupler includes a drive-end rotor and a load-end rotor. The drive-end rotor is installed at the output end of the motor. The load-end rotor is installed inside the refrigeration compressor. The drive-end rotor and the load-end rotor inside the refrigeration compressor are on the same axis. There is a gap between the drive rotor end of the motor and the refrigeration compressor. The refrigeration compressor is externally equipped with a housing that encloses the refrigeration compressor. The housing is made of aluminum alloy with ultra-low magnetic permeability. S2, The drive rotor at the motor output end and the load rotor inside the refrigeration compressor are installed; S3 controls the power supply to the motor through the controller. The motor output drives the rotor of the drive end to rotate. Through the principle of transmitting torque in the air through the magnetic coupler, the rotor of the drive end drives the rotor of the load end, which is encapsulated inside the crankshaft of the refrigeration compressor, to rotate, so that the refrigeration compressor works and completes the driving of the refrigeration compressor.

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