Energy-saving magnetic suspension centrifugal compressor

Abstract

The invention discloses an energy-saving type magnetic suspension centrifugal compressor, and relates to the technical field of compressors, the energy-saving type magnetic suspension centrifugal compressor comprises a compressor shell, a supporting plate is mounted at the bottom of the inner surface of the compressor shell, a magnetic suspension motor is mounted at the center of the inner surface of the compressor shell, and a high-strength rotor is mounted on an output shaft of the magnetic suspension motor; a magnetic suspension bearing surrounds the exterior of the high-strength rotor, and a water cooling mechanism is arranged above the magnetic suspension bearing. The innovative design of the arc-shaped spoiler effectively promotes uniform distribution of heat in the cold water tank by breaking the laminar flow state of water flow and forming complex turbulent flow, avoids excessive accumulation of the heat in the area close to the magnetic suspension bearing, and prevents the problem of bearing performance reduction caused by local overheating; meanwhile, the sealing plate is locally overheated, large thermal stress can be generated on the surface of the sealing plate, the material performance of the sealing plate can be reduced, and even the sealing plate is deformed or damaged, and therefore disturbance of the arc-shaped spoiler is beneficial to maintaining the uniformity of the temperature of the sealing plate.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to an energy-saving magnetic suspension centrifugal compressor. Background Art

[0002] The magnetic levitation centrifugal compressor is a more efficient and energy-saving centrifugal compressor. It uses magnetic levitation bearings to keep the compressor rotor in a suspended state during operation, so that there is no mechanical contact with the base during rotation, thus avoiding mechanical friction.

[0003] The compressor is equipped with a magnetic levitation motor, impeller and bearings, among which the stability and performance of the magnetic levitation bearing are crucial. Since the magnetic levitation bearing will generate a large amount of heat under high load conditions, it is necessary to effectively cool and dissipate the heat to avoid excessive bearing temperature, which will affect the suspension accuracy and stability of the magnetic levitation bearing. The cooling method of traditional centrifugal compressors mainly includes an air cooling system. The cooling efficiency is limited by the air flow rate and temperature difference, the power consumption is high, the operating cost is increased, and it is not energy-efficient. It may not meet the cooling requirements under high load. Therefore, the present invention designs an energy-saving magnetic levitation centrifugal compressor to solve the above problems. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides an energy-saving magnetic levitation centrifugal compressor, comprising a compressor housing, a support plate installed at the bottom of the inner surface of the compressor housing, a magnetic levitation motor installed at the center of the inner surface of the compressor housing, a high-strength rotor installed on the output shaft of the magnetic levitation motor, a magnetic levitation bearing surrounding the outside of the high-strength rotor, and a water-cooling mechanism surrounding the outside of the magnetic levitation bearing. In the magnetic levitation motor, the output shaft of the motor and the high-strength rotor are integrated, but the connection between them is not through traditional mechanical bearings or couplings, but through the electromagnetic force of the magnetic levitation bearing to achieve suspension and drive; that is, the magnetic levitation bearing surrounds the high-strength rotor and suspends the high-strength rotor through electromagnetic force, thereby achieving contactless support and stable operation of the entire high-strength rotor. The stator part of the magnetic levitation bearing is fixed to the surface of the water-cooling mechanism, while the rotor part can be a magnet or a conductor, interacting with the magnetic field generated by the stator.

[0005] Furthermore, the high-strength rotors are symmetrically arranged on both sides of the magnetic levitation motor, and the lower surface of the water cooling mechanism is fixedly connected to the upper surface of the support plate.

[0006] Furthermore, the water cooling mechanism includes a blocking plate, a water inlet pipe disposed at the bottom of the blocking plate, a cold water tank mounted at the bottom end of the water inlet pipe, a control component mounted on the side of the cold water tank remote from the magnetic levitation motor, a water outlet pipe connected to the bottom of the inner wall of the cold water tank, and a piston inserted into the end of the outlet pipe remote from the cold water tank. The blocking plate blocks the water inlet of the water inlet pipe, sealing the end thereof, and the piston seals the end of the water outlet pipe, preventing moisture from leaking out through the end thereof.

[0007] Furthermore, a circular rail is provided on the outside of the cold water tank, with a fixed plate mounted on the side of the rail near the control component. A slide is rotatably connected to the outer surface of the circular rail. The slide rotates along the outer surface of the rail, and a drive motor is installed inside the slide, which can be remotely and wirelessly controlled.

[0008] Furthermore, a connecting plate is installed at the bottom of the slide, a sealing plate is installed at the bottom of the connecting plate, and a plurality of arc-shaped spoilers are installed on the inner surface of the sealing plate. The function of the connecting plate is to fixedly connect the bottom of the slide with the outer surface of the sealing plate, so that the slide can drive the rotation of the sealing plate in the process of rotating along the outer surface of the slide rail, and the sealing plate will rotate in contact with the inner surface of the cold water tank. Through the combination of the sealing plate and the cold water tank, the space wrapped by the cold water tank and the sealing plate can be sealed to prevent the water inside the cold water tank and the sealing plate from leaking out; wherein there is a certain gap between the two sides of the arc-shaped spoiler and the two sides of the inner wall of the cold water tank, and the gap is not large, so that water can flow through the middle of the gap.

[0009] Furthermore, the outer surface of the blocking plate is slidably connected to the inner surface of the compressor housing, the bottom of the cold water tank is fixedly connected to the upper surface of the support plate, and the end of the water outlet pipe away from the cold water tank passes through the inner surface of the compressor housing and extends out of the interior of the compressor housing.

[0010] Furthermore, the outer surface of the sealing plate is slidably connected to the inner surface of the cold water tank, and the inner surface of the fixing plate is fixedly connected to the outer surface of the water inlet pipe.

[0011] Furthermore, the control component includes a power supply, one end of which is electrically connected to a microcontroller via a wire, and the bottom end of the microcontroller is electrically connected to a waterproof temperature sensor via a wire. The outer surface of the waterproof temperature sensor is mounted with a protective housing. The wire electrically connecting the power supply and the microcontroller is buried inside the compressor housing. The waterproof temperature sensor can measure the temperature of the water inside the cold water tank, and the waterproof temperature sensor is a DS18B20 temperature sensor.

[0012] Furthermore, the power supply is installed inside the upper surface of the compressor housing, the microcontroller is installed inside the upper surface of the compressor housing, and the protective shell is installed on a side of the cold water tank close to the power supply.

[0013] The beneficial effects of the present invention are as follows: 1. The innovative design of the arc-shaped spoiler breaks the laminar flow state of the water flow and forms complex turbulence, which effectively promotes the uniform distribution of heat in the cold water tank, avoids excessive heat accumulation in the area close to the magnetic levitation bearing, and prevents the problem of bearing performance degradation caused by local overheating. At the same time, local overheating of the sealing plate will generate large thermal stress on its surface, which may cause the sealing plate material performance to deteriorate or even deform or damage. Therefore, the disturbance of the arc-shaped spoiler helps maintain the uniformity of the sealing plate temperature and reduce the damage to the sealing plate caused by thermal stress.

[0014] 2. The arc-shaped spoiler is designed to be a C-shaped shape with a middle plane and two side edges bent to one side. There is a certain gap between the bent part and both sides of the inner wall of the cold water tank. During the stirring process, some water can flow quickly from the gap, so that the water in the middle area can be merged with the water on both sides of the edge, avoiding the subsequent hot water flow being too concentrated in the middle area.

[0015] 3. The combination of real-time monitoring from a waterproof temperature sensor and precise control from a microcontroller enables automated temperature regulation of the cooling system. When the water temperature reaches a preset threshold, the system automatically activates the slide rotation mechanism to dynamically adjust the cooling water temperature, ensuring the cooling system is always operating optimally, eliminating the need for manual control and reducing operating costs.

[0016] 4. The design of the sealing plate and cold water tank ensures that cooling water does not leak, avoiding coolant waste and environmental pollution. Furthermore, the design of the outlet and inlet pipes facilitates cooling water replacement, eliminating the need to disassemble the compressor casing to replace the internal water. Timely replacement of the cooling water also effectively prevents the cooling water from overheating itself during prolonged cooling of the magnetic bearing, thereby losing its ability to effectively cool the magnetic bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the present invention; Figure 2 is a cross-sectional view of a compressor housing of the present invention; Figure 3 It is a structural schematic diagram of the magnetic bearing of the present invention; Figure 4 It is a structural schematic diagram of the cold water mechanism of the present invention; Figure 5 is a cross-sectional view of a cold water tank of the present invention; Figure 6 It is a structural schematic diagram of the sealing plate of the present invention; Figure 7 It is a structural diagram of the control component of the present invention; Figure 8 It is a flow chart of the control system of the present invention.

[0018] In the figure: 1. Compressor housing; 2. Support plate; 3. Magnetic levitation motor; 4. High-strength rotor; 5. Magnetic levitation bearing; 6. Water cooling mechanism; 61. Blocking plate; 62. Water inlet pipe; 63. Cold water tank; 64. Control component; 641. Power supply; 642. Microcontroller; 643. Waterproof temperature sensor; 644. Protective shell; 65. Water outlet pipe; 66. Piston; 67. Circular slide rail; 68. Fixed plate; 69. Slide; 601. Connecting plate; 602. Sealing plate; 603. Arc spoiler. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described to better illustrate the principles of the invention and its practical application, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for specific applications.

[0020] For example 1, please refer to Figures 1-6 The present invention provides a technical solution: an energy-saving magnetic levitation centrifugal compressor, comprising a compressor housing 1, a support plate 2 mounted on the bottom of the inner surface of the compressor housing 1, a magnetic levitation motor 3 mounted at the center of the inner surface of the compressor housing 1, a high-strength rotor 4 mounted on the output shaft of the magnetic levitation motor 3, a magnetic levitation bearing 5 surrounding the outside of the high-strength rotor 4, and a water-cooling mechanism 6 surrounding the outside of the magnetic levitation bearing 5. In the magnetic levitation motor 3, the output shaft of the motor and the high-strength rotor 4 are integrated, or power is transmitted through a non-contact connection method such as magnetic coupling. However, this connection method does not use traditional mechanical bearings or couplings, but rather uses the electromagnetic force of the magnetic levitation bearing 5 to achieve suspension and drive, thereby achieving contactless support and stable operation of the entire high-strength rotor 4. The stator portion of the magnetic levitation bearing 5 is supported by the inner surface of the water-cooling mechanism 6, while the rotor portion can be a magnet or a conductor, interacting with the magnetic field generated by the stator.

[0021] The high-strength rotors 4 are symmetrically arranged on both sides of the magnetic levitation motor 3 , and the lower surface of the water cooling mechanism 6 is fixedly connected to the upper surface of the support plate 2 .

[0022] The water cooling mechanism 6 includes a blocking plate 61, with a water inlet pipe 62 disposed at its bottom. A cold water tank 63 is mounted at the bottom of the water inlet pipe 62. A control component 64 is mounted on the side of the cold water tank 63 facing away from the magnetic levitation motor 3. A water outlet pipe 65 is connected to the bottom of the inner wall of the cold water tank 63. A piston 66 is inserted into the end of the outlet pipe 65 facing away from the cold water tank 63. The blocking plate 61 blocks the water inlet of the water inlet pipe 62, sealing it. The piston 66 seals the outlet pipe 65, preventing moisture from leaking out. The water inlet pipe 62 is a rigid pipe with a strong bearing capacity.

[0023] A circular slide 67 is provided on the outside of the cold water tank 63. A fixing plate 68 is installed on the side of the circular guide rail close to the control component 64. The outer surface of the circular guide rail is rotatably connected to a slide 69. The slide 69 can rotate along the outer surface of the slide rail, and a drive motor is provided inside the slide 69. This drive motor can be remotely controlled wirelessly.

[0024] A connecting plate 601 is installed at the bottom of the slide 69, and a sealing plate 602 is installed at the bottom of the connecting plate 601. The inner surface of the sealing plate 602 is installed with multiple arc-shaped spoilers 603. The function of the connecting plate 601 is to fixedly connect the bottom of the slide 69 with the outer surface of the sealing plate 602. Therefore, when the slide 69 rotates along the outer surface of the slide rail, it can drive the rotation of the sealing plate 602. The sealing plate 602 will rotate in contact with the inner surface of the cold water tank 63. Through the combination of the sealing plate 602 and the cold water tank 63, a sealing effect can be achieved on the space wrapped by the cold water tank 63 and the sealing plate 602, preventing the water inside the cold water tank 63 and the sealing plate 602 from leaking out. There is a certain gap between the two sides of the arc-shaped spoiler 603 and the two sides of the inner wall of the cold water tank 63. The gap is not large, which facilitates the flow of water through the gap.

[0025] The outer surface of the blocking plate 61 is slidably connected to the inner surface of the compressor housing 1, the bottom of the cold water tank 63 is fixedly connected to the upper surface of the support plate 2, and the end of the water outlet pipe 65 away from the cold water tank 63 passes through the inner surface of the compressor housing 1 and extends out of the interior of the compressor housing 1.

[0026] The outer surface of the sealing plate 602 is slidably connected to the inner surface of the cold water tank 63 , and the inner surface of the fixing plate 68 is fixedly connected to the outer surface of the water inlet pipe 62 .

[0027] When the magnetic levitation centrifugal compressor is in use and has been working for a period of time, the magnetic levitation bearing 5 inside it will generate a lot of heat under high-speed rotation and high-load conditions, so it is necessary to use the water cooling mechanism 6 to effectively cool down the surrounding area.

[0028] In the initial stage, the blocking plate 61 is pulled out from the inside of the upper surface of the compressor housing 1, and the water inlet pipe 62 below is exposed. The staff pours a certain amount of water into the pipe mouth of the water inlet pipe 62, so that the space wrapped by the cold water tank 63 and the sealing plate 602 is filled with water until the water gradually spreads upward to the inlet of the water inlet pipe 62. When the staff sees that the water is obviously rising along the inside of the water inlet pipe 62, the blocking plate 61 is inserted into the upper surface of the compressor housing 1, and no longer supplies water to the inside of the water inlet pipe 62.

[0029] Since the wrapping space between the sealing plate 602 and the cold water tank 63 is sealed, moisture will not penetrate into the interior of the compressor casing from the wrapping space between the two. When a certain amount of heat slowly appears during the operation of the magnetic bearing 5, the slide 69 starts to run and can rotate along the outer surface of the slide rail. During the rotation, it can drive the bottom connecting plate 601 and the sealing plate 602 to perform circular motion. In the process of rotating against the inner wall of the cold water tank 63, the sealing plate 602 will drive the rotation of multiple arc-shaped spoilers 603. The arc-shaped spoiler 603 can make the moisture inside the wrapping space between the cold water tank 63 and the sealing plate 602 rotate along the inner walls of the two, making the moisture full of fluidity and improving the cooling effect on heat. Therefore, when the sealing plate 602 drives the arc-shaped spoiler 603 to rotate, the originally relatively static water is stirred by the action of the arc-shaped spoiler 603. The flow of water can transfer heat from the spatial area around the magnetic bearing 5 to the entire water body more quickly. Because the static water absorbs heat locally, the water closer to the magnetic bearing 5 is hotter, and the water farther away is slightly lower in temperature relative to the incoming water. The disturbance of the arc-shaped spoiler 603 can break this thermal stratification phenomenon, avoid excessive accumulation of heat in this area close to the magnetic bearing 5, and prevent local overheating. At the same time, if the sealing plate 602 is locally overheated, its surface will produce large thermal stress, which may cause the material performance of the sealing plate 602 to deteriorate, or even deform or damage. Therefore, the disturbance of the arc-shaped spoiler 603 helps to maintain the temperature uniformity of the sealing plate 602 and reduce the damage to the sealing plate 602 caused by thermal stress.

[0030] Among them, the arc-shaped spoiler 603 is designed to be a C-shaped shape with a central plane and two side edges that bend to one side. There is a certain gap between the bend and the inner wall of the cold water tank 63 on both sides, which can allow some water to flow rapidly from the gap during the stirring process. Because the cross-section of the area surrounded by the cold water tank 63 and the sealing plate 602 is larger than the cross-section of the magnetic bearing 5, the water on both sides of the area surrounded by the cold water tank 63 and the sealing plate 602 is heated more slowly, while the water in the middle area facing the surrounding area is heated more quickly. Therefore, this design has significant advantages in the process of stirring the water flow. When the spoiler rotates, the depressions on both sides will form local low-pressure areas, prompting the water flow to flow from the middle to the depressions on both sides, and then quickly flow out from the gap, so that the water in the middle area and the water on both sides of the edges are merged, which helps to break the laminar state of the water flow and form a more complex turbulent flow. It can prevent the subsequent hot water flow from being too concentrated in the central area, so that the heat can be more evenly distributed throughout the cooling system.

[0031] For example 2, please refer to Figures 1-8 The present invention provides a technical solution: Based on the first embodiment, the control component 64 includes a power supply 641. One end of the power supply 641 is electrically connected to a microcontroller 642 via a wire. The bottom end of the microcontroller 642 is electrically connected to a waterproof temperature sensor 643 via a wire. The outer surface of the waterproof temperature sensor 643 is installed with a protective shell 644. The wire electrically connecting the power supply 641 and the microcontroller 642 is buried inside the compressor housing 1. The waterproof temperature sensor 643 can measure the temperature of the water inside the cold water tank 63. The waterproof temperature sensor 643 in this device is a DS18B20 model, and the microcontroller 642 is an ESP32 model with built-in Wi-Fi function. The motor driver inside the slide 69 is a TMC2208 that receives control instructions and drives the operation of the stepper motor inside the slide 69. The stepper motor model is NEMA17.

[0032] The power supply 641 is installed inside the upper surface of the compressor housing 1 , the microcontroller 642 is installed inside the upper surface of the compressor housing 1 , and the protective shell 644 is installed on a side of the cold water tank 63 close to the power supply 641 .

[0033] During use, since the protective shell 644 is connected to the internal space of the cold water tank 63, the waterproof temperature sensor 643 installed inside can effectively detect the water temperature inside the cold water tank 63 in real time. When the temperature reaches the preset value, the waterproof temperature sensor 643 will transmit the water temperature signal to the microcontroller 642. After receiving the temperature signal, the microcontroller 642 processes and judges the signal. When it is detected that the water temperature exceeds the set threshold, the microcontroller 642 uses its built-in Wi-Fi function to send a control instruction to the motor driver inside the slide 69 through the wireless network. After receiving the instruction, the motor driver drives the stepper motor to operate, thereby driving the slide 69 to rotate along the outer surface of the slide rail, thereby realizing automatic adjustment and control of the internal temperature of the cold water tank 63. The entire process does not require any physical wire connection, ensuring the flexibility and convenience of the system.

[0034] Among them, when the magnetic bearing 5 works for too long, causing the moisture inside the space area wrapped by the cold water tank 63 and the sealing plate 602 to basically heat up, it means that the internal moisture can no longer effectively cool the surrounded magnetic bearing 5. At this time, the built-in Wi-Fi function of the microcontroller 642 receives or transmits data from a remote device such as a mobile phone or computer in real time, and observes the temperature through the mobile phone or computer. When the temperature exceeds the maximum preset value, it reminds the staff that the moisture inside the area wrapped by the cold water tank 63 and the sealing plate 602 needs to be replaced, and the staff will go out The piston 66 at the bottom of the water pipe 65 is pulled out from the inside, and then the water inside the cold water tank 63 will all flow out through the water outlet pipe 65. When the internal water has flowed out, the piston 66 is reinserted into the water outlet pipe 65 to block the bottom hole. Then the blocking plate 61 inside the upper surface of the compressor casing is pulled out, and new cold water is supplied to the inside of the water inlet pipe 62 until the water in the area wrapped inside the cold water tank 63 and the sealing plate 602 is full. A new cooling effect can be achieved without the need to disassemble the compressor casing 1 to replace new cooling water.

[0035] Finally, the combination of waterproof temperature sensor 643 and microcontroller 642 enables automated temperature control. When the temperature reaches a preset value, the system automatically activates the cooling mechanism, avoiding unnecessary energy waste. This automated control method not only improves system efficiency but also reduces manual intervention, lowering operating costs and further enhancing the system's energy efficiency.

[0036] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without making creative efforts should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention shall be implemented in accordance with conventional means in the field unless otherwise specified or limited.

Claims

1. An energy-saving magnetically suspended centrifugal compressor, comprising a compressor housing (1), characterized in that: A support plate (2) is installed at the bottom of the inner surface of the compressor housing (1), a magnetic levitation motor (3) is installed at the center of the inner surface of the compressor housing (1), a high-strength rotor (4) is installed on the output shaft of the magnetic levitation motor (3), a magnetic levitation bearing (5) surrounds the outside of the high-strength rotor (4), and a water cooling mechanism (6) surrounds the outside of the magnetic levitation bearing (5).

2. The energy-saving magnetic levitation centrifugal compressor according to claim 1, characterized in that: The high-strength rotor (4) is symmetrically arranged on both sides of the magnetic levitation motor (3), and the lower surface of the water cooling mechanism (6) is fixedly connected to the upper surface of the support plate (2).

3. The energy-saving magnetic levitation centrifugal compressor according to claim 1, characterized in that: The water cooling mechanism (6) includes a blocking plate (61), a water inlet pipe (62) is provided at the bottom of the blocking plate (61), a cold water tank (63) is installed at the bottom pipe opening of the water inlet pipe (62), a control component (64) is installed on the side of the cold water tank (63) away from the magnetic levitation motor (3), a water outlet pipe (65) is connected to the bottom of the inner wall of the cold water tank (63), and a piston (66) is inserted into the pipe opening of one end of the water outlet pipe (65) away from the cold water tank (63).

4. The energy-saving magnetic levitation centrifugal compressor according to claim 3, characterized in that: A circular slide rail (67) is provided on the outside of the cold water tank (63), a fixing plate (68) is installed on one side of the circular guide rail close to the control component (64), and a slide platform (69) is rotatably connected to the outer surface of the circular guide rail.

5. The energy-saving magnetic levitation centrifugal compressor according to claim 4, characterized in that: A connecting plate (601) is installed at the bottom of the slide (69), a sealing plate (602) is installed at the bottom of the connecting plate (601), and a plurality of arc-shaped spoilers (603) are installed on the inner surface of the sealing plate (602).

6. The energy-saving magnetic levitation centrifugal compressor according to claim 5, characterized in that: The outer surface of the blocking plate (61) is slidably connected to the inner surface of the compressor housing (1), the bottom of the cold water tank (63) is fixedly connected to the upper surface of the support plate (2), and the end of the water outlet pipe (65) away from the cold water tank (63) passes through the inner surface of the compressor housing (1) and extends out of the interior of the compressor housing (1).

7. The energy-saving magnetic levitation centrifugal compressor according to claim 6, characterized in that: The outer surface of the sealing plate (602) is slidably connected to the inner surface of the cold water tank (63), and the inner surface of the fixing plate (68) is fixedly connected to the outer surface of the water inlet pipe (62).

8. The energy-saving magnetic levitation centrifugal compressor according to claim 3, characterized in that: The control component (64) includes a power supply (641), one end of the power supply (641) is electrically connected to a microcontroller (642) via a wire, the bottom end of the microcontroller (642) is electrically connected to a waterproof temperature sensor (643) via a wire, and a protective shell (644) is installed on the outer surface of the waterproof temperature sensor (643).

9. The energy-saving magnetic levitation centrifugal compressor according to claim 8, characterized in that: The power supply (641) is installed inside the upper surface of the compressor housing (1), the microcontroller (642) is installed inside the upper surface of the compressor housing (1), and the protective shell (644) is installed on a side of the cold water tank (63) close to the power supply (641).

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