A multi-connected air conditioner with a magnetic suspension compressor

Abstract

This invention relates to the field of compressor technology, and more particularly to a multi-split magnetic levitation compressor and air conditioner. The multi-split magnetic levitation compressor includes a housing, rotor, stator, heat sink, axial fan, magnetic bearing, radial fan, loop heat pipe, air guide, detection chamber, and venturi tube. The heat sink is fitted around the outer periphery of the stator and has one set of heat dissipation fins. The axial fan is fixed to the rotor and symmetrically distributed on both sides of the stator. The radial fan is located between the magnetic bearing and the axial fan. The evaporation end of the loop heat pipe is attached to the magnetic bearing, and the condensation end is located outside the radial fan and has two sets of heat dissipation fins. The air guide is used to direct airflow from the axial fan to the radial fan. The detection chamber communicates with the interior of the housing, and the venturi tube is located inside the air outlet. The detection chamber is connected to the throat of the venturi tube via a connecting pipe. This invention cools the stator through the heat sink and axial fan, cools the magnetic bearing through the loop heat pipe and radial fan, and uses the venturi tube to draw gas from the detection chamber to maintain its low-temperature environment.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a multi-split magnetic levitation compressor and air conditioner. Background Technology

[0002] Air conditioning systems are widely used in modern buildings due to their advantages such as flexible installation, high energy efficiency, and precise control. As a core component, the compressor's performance directly determines the energy efficiency and reliability of the entire system. Magnetic levitation compressors utilize magnetic bearings to levitate the rotor, achieving contactless and oil-free lubrication. This fundamentally eliminates mechanical friction losses, significantly improving energy efficiency and service life, and represents an important development direction for high-end multi-split air conditioning systems.

[0003] However, high-power-density motor stators generate a significant amount of heat. If heat dissipation is insufficient, it can lead to decreased motor efficiency and even damage to the insulation due to overheating. Secondly, the magnetic bearings and their precision control circuits are extremely sensitive to temperature. Excessively high temperatures can affect the levitation accuracy and stability of the magnetic bearings, and may even trigger a protective shutdown of the system. Furthermore, the complex airflow organization within the compressor presents a challenge in design: how to efficiently guide the cooling airflow while avoiding the thermal impact of high-temperature areas on low-temperature areas (such as the control and detection chamber). Existing technologies often employ relatively simple cooling structures, making it difficult to simultaneously and efficiently cool both the motor and the magnetic bearings. Additionally, the detection chamber is susceptible to interference from the internal thermal environment, affecting the detection accuracy of sensors and other components. Summary of the Invention

[0004] The present invention aims to provide a multi-split magnetic levitation compressor and air conditioner to achieve efficient heat dissipation of the motor stator and magnetic bearing, optimize internal airflow organization, and ensure the working stability of the detection chamber.

[0005] In a first aspect, embodiments of this application provide a multi-unit magnetic levitation compressor, comprising: The shell has an internal space for receptacle; The rotor is rotatably disposed inside the housing; The stator is disposed around the outer periphery of the rotor; A heat sink is fitted around the outer periphery of the stator, and a plurality of heat sink fins are provided on the outer peripheral wall of the heat sink. A blower shroud is located at the front end of the housing; Multiple air inlets are provided on the housing and located on the outer periphery of the heat dissipation fins. Two axial fans are fixedly connected to the rotor and are symmetrically distributed on both sides of the stator in the axial direction; Magnetic bearings are symmetrically arranged inside the housing to support the rotor; A radial fan is fixedly connected to the rotor and disposed between the magnetic bearing and the axial fan; The loop heat pipe has its evaporation end attached to the outer wall of the magnetic bearing, and its condensation end located on the axial outer side of the radial fan, with multiple heat dissipation fins on the condensation end. A deflector is disposed between the axial fan and the radial fan to guide the airflow entering through the air inlet from the axial fan to the radial fan; A partition is disposed between the radial fan and the magnetic bearing; Multiple air outlets are provided on the side wall of the housing and located between the partition and the air guide shroud; The detection chamber is disposed inside the housing, located between the stator and the blower shroud, and one end of the detection chamber is connected to the internal space of the housing; A venturi tube is disposed in the air outlet near the detection chamber, and the end of the detection chamber away from the internal space of the housing is connected to the throat of the venturi tube through a connecting pipe.

[0006] Furthermore, the evaporation end of the loop heat pipe is tightly wrapped around the outer circumferential wall of the magnetic bearing.

[0007] Furthermore, the inlet end of the venturi tube is positioned in the direction of airflow inflow towards the air outlet, its diffuser section is positioned in the direction of airflow outflow towards the air outlet, and the throat is located in the middle section of the venturi tube.

[0008] Furthermore, the heat dissipation component is a heat-conducting sleeve, the heat dissipation fins extend along the axial direction of the heat dissipation component, and a plurality of the heat dissipation fins are evenly distributed along the circumference of the heat dissipation component.

[0009] Furthermore, the magnetic bearing includes a first magnetic bearing and a second magnetic bearing spaced apart along the axial direction, and the loop heat pipe is respectively disposed on the first magnetic bearing and the second magnetic bearing.

[0010] Furthermore, the plurality of air outlets are evenly distributed along the circumference of the housing.

[0011] Furthermore, the shroud is horn-shaped, with its large-diameter end facing the axial fan and its small-diameter end facing the radial fan.

[0012] Furthermore, the partition is an annular plate, and its outer ring is sealed to the inner wall of the housing.

[0013] Secondly, embodiments of this application provide an air conditioner, which includes the multi-split magnetic levitation compressor described in the first aspect.

[0014] Compared with existing technologies, the advantages of this invention are as follows: By setting a heat sink with heat dissipation fins on the outer periphery of the stator, and cooperating with an axial fan and air inlet, efficient air cooling of the stator is achieved. By setting a loop heat pipe on the magnetic bearing, the heat generated is quickly transferred to the condenser end, and the airflow guided by the radial fan forces air cooling of the heat dissipation fins on the condenser end, achieving precise and efficient cooling of the magnetic bearing. By setting an axial fan, a radial fan, a guide shroud, and a baffle, a clear and orderly internal cooling airflow channel is constructed: external cold air enters through the air inlet, first flows through the heat dissipation fins to cool the stator, then flows through the guide shroud to the radial fan under the drive of the axial fan, the radial fan then guides the airflow to the condenser end of the loop heat pipe, and finally the airflow carrying heat is discharged through the air outlet. This airflow organization avoids disorderly circulation of hot air within the casing and improves cooling efficiency. In addition, by utilizing the principle of the Venturi tube, gas is drawn from the detection chamber through the connecting tube, creating a slight negative pressure inside the detection chamber. This guides some of the internal cooling gas to flow through the detection chamber, carrying away any heat that may accumulate inside, thereby effectively maintaining the temperature stability of the detection chamber environment and ensuring the accuracy of the detection results. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the shell; Figure 3 for Figure 2 Enlarged schematic diagram of section A in the middle; Figure 4 A schematic diagram of the assembly of the stator, rotor, magnetic bearing, axial fan, radial fan, loop heat pipe, baffle, and fairing; Figure 5 This is a schematic diagram of the structure of the magnetic bearing, the loop heat pipe, and the radial fan.

[0016] In the diagram: 1. Housing; 2. Rotor; 3. Stator; 4. Heat sink; 41. Heat sink fin one; 5. Blower shroud; 6. Axial fan; 7. Magnetic bearing; 71. First magnetic bearing; 72. Second magnetic bearing; 8. Radial fan; 9. Loop heat pipe; 91. Evaporator end; 92. Condenser end; 93. Heat sink fin two; 10. Air guide shroud; 11. Air inlet; 12. Baffle plate; 13. Air outlet; 14. Detection chamber; 15. Venturi tube; 151. Throat; 16. Connecting pipe. Detailed Implementation

[0017] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] As shown in the figure, this application provides a multi-split magnetic levitation compressor, which includes a housing 1, a rotor 2, a stator 3, a heat sink 4, a blower shroud 5, an axial fan 6, a magnetic bearing 7, a radial fan 8, a loop heat pipe 9, a flow guide shroud 10, a partition 12, a detection chamber 14, and a venturi tube 15.

[0019] The housing 1 has an internal space for accommodating the core components of the compressor. The rotor 2 is rotatably mounted inside the housing 1. The stator 3 surrounds the outer periphery of the rotor 2. A heat sink 4 is fitted around the outer periphery of the stator 3, and multiple heat sink fins 41 are provided on the outer peripheral wall of the heat sink 4. A blower shroud 5 is located at the front end of the housing 1. Multiple air inlets 11 are formed on the housing 1 and located in the outer peripheral area of ​​the heat sink fins 41. Two axial fans 6 are fixedly connected to the rotor 2 and symmetrically distributed on both sides of the stator 3 axially. Magnetic bearings 7 are symmetrically arranged inside the housing 1 to support the rotor 2. A radial fan 8 is located between the magnetic bearings 7 and the axial fans 6. The evaporation end 91 of the loop heat pipe 9 is attached to the outer wall of the magnetic bearing 7, and its condensation end 92 is located axially outside the radial fan 8, with multiple heat sink fins 93 provided on the condensation end 92. A flow guide shroud 10 is disposed between the axial fan 6 and the radial fan 8 to guide the airflow entering through the air inlet 11 from the axial fan 6 to the radial fan 8. A baffle 12 is disposed between the radial fan 8 and the magnetic bearing 7. Multiple air outlets 13 are formed on the side wall of the housing 1 and are located between the baffle 12 and the flow guide shroud 10. A detection chamber 14 is disposed inside the housing 1, located between the stator 3 and the blower shroud 5, and one end of the detection chamber 14 communicates with the internal space of the housing 1. A venturi tube 15 is disposed in the air outlet 13 near the detection chamber 14, and the end of the detection chamber 14 away from the internal space of the housing 1 is connected to the throat 151 of the venturi tube 15 via a connecting pipe 16.

[0020] Two axial fans 6 and a radial fan 8 are directly fixed to the rotor 2. When the rotor 2 rotates at high speed under the suspension support of the magnetic bearing 7, the axial fans 6 and the radial fans 8 rotate synchronously, thereby driving the cooling airflow inside the housing 1. This design allows the fans to be powered entirely by the compressor's own rotor 2, eliminating the need for an additional independent motor or drive unit, thus simplifying the internal structure of the compressor.

[0021] Driven by rotor 2, axial fan 6 and radial fan 8 rotate synchronously. External cooling gas enters the housing 1 through air inlet 11, flows sequentially through heat sink 4, air guide shroud 10, radial fan 8, and the condenser end 92 of loop heat pipe 9, and is finally discharged through air outlet 13. During this process, the heat generated by stator 3 is transferred to the cooling gas through heat sink 4 and its heat dissipation fins 41, and the heat generated by magnetic bearing 7 is transferred to the condenser end 92 through loop heat pipe 9 and carried away by the cooling gas, achieving efficient cooling of stator 3 and magnetic bearing 7. At the same time, venturi tube 15 utilizes the low-pressure effect of throat 151 to draw gas from detection chamber 14 through connecting pipe 16, allowing some of the cooling gas to flow through detection chamber 14 and carry away its internal heat, ensuring the temperature stability of the environment inside detection chamber 14.

[0022] The heat sink 4 is a heat-conducting sleeve made of a high thermal conductivity material (such as copper or aluminum) to quickly conduct the heat generated by the stator 3. The heat sink fins 41 extend along the axial direction of the heat sink 4, and multiple heat sink fins 41 are evenly distributed along the circumference of the heat sink 4 to maximize the heat exchange area and improve heat dissipation efficiency.

[0023] Within the housing 1, a cooling airflow channel is constructed by the rotor 2 driving the axial fan 6 and the radial fan 8 to rotate. External cold air enters through the air inlet 11, first flowing through the heat dissipation fins 41 to cool the stator 3, and then, driven by the axial fan 6, flowing through the guide shroud 10 to the radial fan 8. The radial fan 8 guides the airflow to the condenser end 92 of the loop heat pipe 9, and finally, the air carrying heat is discharged through the air outlet 13. This design avoids disordered circulation of hot air within the housing, improving cooling efficiency.

[0024] The magnetic bearing 7 generates a large amount of heat during operation. If heat dissipation is not timely, it will affect the levitation accuracy and stability of the magnetic bearing 7. In addition, the detection cavity 14 is equipped with detection elements such as displacement sensors. If the internal temperature is too high, it will affect the accuracy of the detection results.

[0025] This application solves the above problems by using a loop heat pipe 9 to precisely cool the magnetic bearing 7 and using a venturi tube 15 to actively dissipate heat from the detection chamber 14.

[0026] The multi-split magnetic levitation compressor is also equipped with a loop heat pipe 9, whose evaporation end 91 is tightly wrapped around the outer circumferential wall of the magnetic bearing 7, and whose condensation end 92 is located on the axial outside of the radial fan 8, and multiple heat dissipation fins 93 are provided on the condensation end 92.

[0027] The loop heat pipe 9 is a component that utilizes the principle of working fluid phase change for efficient heat transfer. After absorbing heat from the magnetic bearing 7 at its evaporation end 91, the internal working fluid evaporates and vaporizes, carrying heat rapidly to the condensation end 92. After releasing heat at the condensation end 92, the heat is condensed and flows back, forming a cycle. Heat dissipation fins 93 are disposed on the condensation end 92 to enhance heat exchange with the cooling airflow.

[0028] The evaporation end 91, located on the outer wall of the magnetic bearing 7, is used to quickly absorb the heat generated by the magnetic bearing 7, preventing heat accumulation at the magnetic bearing 7. The condensation end 92 is located on the axial outer side of the radial fan 8, allowing the airflow guided by the radial fan 8 to be forced to flow over the heat dissipation fins 93, carrying away the heat. Through phase change heat transfer via the loop heat pipe 9, efficient and precise cooling of the magnetic bearing 7 is achieved, effectively solving the heat dissipation problem of the magnetic bearing 7 and ensuring its operational stability.

[0029] The magnetic bearing 7 includes a first magnetic bearing 71 and a second magnetic bearing 72 arranged axially at intervals. A loop heat pipe 9 is respectively provided on the first magnetic bearing 71 and the second magnetic bearing 72. The two magnetic bearings 7 are independently equipped with loop heat pipes 9, enabling them to dissipate heat independently according to their respective heat loads without interference, further improving the uniformity and reliability of cooling.

[0030] The air deflector 10 is funnel-shaped, with its larger diameter end facing the axial fan 6 to collect airflow and its smaller diameter end facing the radial fan 8 to accelerate airflow, allowing the airflow to be guided more smoothly from the axial fan 6 to the radial fan 8, thus reducing flow resistance. The baffle 12 is an annular plate, with its outer ring sealed to the inner wall of the housing 1, used to isolate the airflow, ensuring unidirectional flow of the cooling airflow and improving cooling efficiency.

[0031] Multiple air outlets 13 are evenly distributed along the circumference of the housing 1 to ensure uniform airflow and avoid local heat accumulation.

[0032] When the multi-split magnetic levitation compressor is running, both the stator 3 and the magnetic bearing 7 generate a large amount of heat, and the internal components of the detection chamber 14 are sensitive to ambient temperature. Cooling structures often struggle to provide efficient and balanced cooling for both the motor and the magnetic bearing simultaneously, and the detection chamber is easily affected by the internal thermal environment, impacting detection accuracy.

[0033] The multi-split air conditioning unit's magnetic levitation compressor also includes a Venturi tube 15, which is located within the air outlet 13 near the detection chamber 14. The inlet end of the Venturi tube 15 faces the airflow inflow direction of the air outlet 13, its diffuser section faces the airflow outflow direction of the air outlet 13, and the throat 151 is located in the middle section of the Venturi tube 15. The end of the detection chamber 14 furthest from the interior space of the housing 1 is connected to the throat 151 of the Venturi tube 15 via a connecting pipe 16.

[0034] The Venturi tube 15 refers to a pipe structure whose cross-section initially contracts and then expands, with its throat 151 being the smallest cross-section. According to fluid mechanics principles, when airflow passes through the Venturi tube 15, the flow velocity increases at the throat 151, and the static pressure decreases, forming a low-pressure zone. This low-pressure zone is connected to the detection chamber 14 via the connecting pipe 16, thereby creating a slight negative pressure within the detection chamber 14.

[0035] Under this pressure difference, a portion of the cooling gas inside the housing 1 (i.e., gas that has been cooled by the stator 3 but has not yet been heated by the heat of the magnetic bearing 7) is drawn into the detection chamber 14 from the end that connects to the internal space of the housing 1. This relatively low-temperature gas flows through the detection chamber 14, carrying away any heat that may have accumulated there, and is then drawn into the throat 151 of the venturi tube 15 via the connecting pipe 16, and discharged from the air outlet 13 along with the main airflow. This process effectively maintains the low-temperature environment inside the detection chamber 14, avoiding measurement errors or malfunctions in the internal electronic components due to heat accumulation, thereby ensuring the accuracy of the detection results and the stability of the control system.

[0036] The inlet end of the Venturi tube 15 is positioned facing the airflow inflow direction of the outlet 13, while its diffuser section is positioned facing the airflow outflow direction of the outlet 13. This ensures that the airflow can flow smoothly through the Venturi tube 15 and generate the expected low-pressure effect at the throat 151. The throat 151 is located in the middle section of the Venturi tube 15 and is the lowest pressure point. The connecting pipe 16 is connected to this point to maximize the suction effect.

[0037] The detection chamber 14 is located between the stator 3 and the blower shroud 5. This position is relatively far away from the main heat sources such as the magnetic bearing 7, and is located in the initial section of the cooling airflow, which facilitates the introduction of relatively low-temperature airflow for self-cooling.

[0038] It should be noted that in the embodiments of this application, the above-mentioned structures can be set independently or in combination to achieve synergistic effects. For example, in a magnetic levitation compressor equipped with a loop heat pipe 9, a venturi tube 15 is also set to dissipate heat from the detection chamber 14, which can comprehensively improve the thermal management level and operational reliability of the compressor. In addition, the embodiments of this application also provide an air conditioner, including the multi-split magnetic levitation compressor of the above embodiments. Since the air conditioner uses the multi-split magnetic levitation compressor of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

Claims

1. A multi-unit magnetic levitation compressor, characterized in that, include: The shell (1) has an internal space for receiving; The rotor (2) is rotatably disposed inside the housing (1); The stator (3) is arranged around the outer periphery of the rotor (2); Heat sink (4) is sleeved on the outer periphery of the stator (3), and a plurality of heat sink fins (41) are provided on the outer periphery wall of the heat sink (4). A blower shroud (5) is disposed at the front end of the housing (1); Multiple air inlets (11) are provided on the housing (1) and located on the outer periphery of the heat dissipation fin (41); Two axial fans (6) are fixedly connected to the rotor (2) and are symmetrically distributed on both sides of the stator (3) in the axial direction; Magnetic bearings (7) are symmetrically arranged inside the housing (1) to support the rotor (2). A radial fan (8) is fixedly connected to the rotor (2) and disposed between the magnetic bearing (7) and the axial fan (6); The loop heat pipe (9) has its evaporation end (91) attached to the outer wall of the magnetic bearing (7), and its condensation end (92) is located on the axial outer side of the radial fan (8), and a plurality of heat dissipation fins (93) are provided on the condensation end (92). A deflector (10) is disposed between the axial fan (6) and the radial fan (8) to guide the airflow entering through the air inlet (11) from the axial fan (6) to the radial fan (8). A partition (12) is disposed between the radial fan (8) and the magnetic bearing (7); Multiple air outlets (13) are provided on the side wall of the housing (1) and located between the partition (12) and the air guide (10); The detection chamber (14) is located inside the housing (1). The detection chamber (14) is located between the stator (3) and the blower shroud (5), and one end of it is connected to the internal space of the housing (1). A venturi tube (15) is disposed in the air outlet (13) near the detection chamber (14). The end of the detection chamber (14) away from the internal space of the housing (1) is connected to the throat (151) of the venturi tube (15) through a connecting pipe (16).

2. A multi-unit magnetic levitation compressor according to claim 1, characterized in that: The evaporation end (91) of the loop heat pipe (9) is tightly wrapped around the outer circumferential wall of the magnetic bearing (7).

3. A multi-unit magnetic levitation compressor according to claim 1, characterized in that: The inlet end of the Venturi tube (15) is arranged in the direction of airflow inflow of the air outlet (13), and its diffuser section is arranged in the direction of airflow outflow of the air outlet (13). The throat (151) is located in the middle section of the Venturi tube (15).

4. A multi-unit magnetic levitation compressor according to claim 1, characterized in that: The heat sink (4) is a heat-conducting sleeve, the heat sink fins (41) extend along the axial direction of the heat sink (4), and a plurality of the heat sink fins (41) are evenly distributed along the circumference of the heat sink (4).

5. A multi-unit magnetic levitation compressor according to claim 1, characterized in that: The magnetic bearing (7) includes a first magnetic bearing (71) and a second magnetic bearing (72) spaced apart along the axial direction, and the loop heat pipe (9) is respectively provided on the first magnetic bearing (71) and the second magnetic bearing (72).

6. A multi-unit magnetic levitation compressor according to claim 1, characterized in that: The plurality of air outlets (13) are evenly distributed along the circumference of the housing (1).

7. A multi-unit magnetic levitation compressor according to claim 1, characterized in that: The air deflector (10) is horn-shaped, with its large-diameter end facing the axial fan (6) and its small-diameter end facing the radial fan (8).

8. A multi-unit magnetic levitation compressor according to claim 1, characterized in that: The partition (12) is an annular plate, and its outer ring is sealed to the inner wall of the shell (1).

9. An air conditioner, characterized in that: The air conditioner includes a multi-split magnetic levitation compressor as described in any one of claims 1 to 8.

Images