Cooling structure of magnetic levitation refrigerant compressor

Abstract

The utility model belongs to the field of magnetic suspension refrigerant compressor, concretely relates to a kind of cooling structure of magnetic suspension refrigerant compressor, including compressor shell, stator core and motor rotor, and refrigerant inlet and refrigerant outlet are equipped on compressor shell;Air gap is formed between stator core and motor rotor;Spiral groove is processed on the outer circle surface of motor rotor and located in air gap region, and the outer circle of stator core is sleeved with cooling jacket, and the outer circle of cooling jacket is processed with spiral flow channel, and one side of cooling jacket is equipped with medium guide gap;After refrigerant enters from refrigerant inlet, it flows through air gap and the spiral flow channel of cooling jacket in turn, and finally flows out from refrigerant outlet, forming double cooling path to the inside and outside of stator core;The utility model effectively solves the problem that magnetic suspension motor faces narrow air gap, large refrigerant flow resistance, poor cooling, and complex cooling system and high leakage risk caused by multi-path cooling scheme.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic levitation refrigerant compressors, and specifically relates to a cooling structure for a magnetic levitation refrigerant compressor. Background Technology

[0002] Magnetic levitation refrigerant compressors, as high-efficiency refrigeration equipment based on magnetic levitation bearing technology, achieve contactless rotor levitation through electromagnetic force, significantly reducing mechanical friction losses and showing broad application prospects in the refrigeration field. Their core heat source is the electromagnetic loss of the magnetic levitation motor, especially the iron loss generated in the stator core under alternating magnetic field and the copper loss in the windings. Therefore, efficient cooling is a key technology to ensure stable operation of the equipment.

[0003] Currently, the mainstream cooling method for magnetic levitation refrigerant compressors is to introduce refrigerant into the magnetic levitation motor, where heat is carried away by the refrigerant flow. However, this technology has the following significant drawbacks:

[0004] Firstly, the air gap between the stator core and rotor of a magnetic levitation motor is extremely small (usually 0.1~1mm). When the refrigerant flows through the air gap, the flow resistance increases significantly due to the narrow space, the flow velocity decreases, and it is difficult to effectively remove the heat from the stator core. Especially in high power density operation scenarios, this can easily cause the motor to overheat, affecting efficiency and lifespan.

[0005] Secondly, to compensate for the shortcomings of air gap cooling, existing technologies generally adopt multi-channel cooling schemes, which enhance the flow of cooling medium by adding multiple external cooling pipes to divert the refrigerant. However, this leads to increased complexity of the cooling system and an increase in potential leakage points. Utility Model Content

[0006] The main technical problem to be solved by this utility model is to provide a cooling structure for a magnetic levitation refrigerant compressor that can effectively solve the problems faced by magnetic levitation motors, such as narrow air gap leading to high refrigerant flow resistance and poor cooling, as well as complex cooling systems and high leakage risks caused by multiple cooling schemes.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0008] A cooling structure for a magnetic levitation refrigerant compressor includes a compressor housing, a stator core, and a motor rotor. The compressor housing has a refrigerant inlet and a refrigerant outlet. An air gap is formed between the stator core and the motor rotor. The characteristic feature is that a spiral groove is machined on the outer circumferential surface of the motor rotor and located in the air gap area, which is used to promote the flow of refrigerant and increase the air gap flow area when the motor rotor rotates.

[0009] The stator core is fitted with a cooling sleeve on its outer circumference. The outer circumference of the cooling sleeve is machined with a spiral flow channel, and the cooling sleeve is provided with a medium guiding notch on one side corresponding to the air gap outlet position, which is used to guide the refrigerant flowing through the air gap into the inlet of the spiral flow channel.

[0010] After entering through the refrigerant inlet, the refrigerant flows sequentially through the spiral channels of the air gap and the cooling jacket, and finally flows out through the refrigerant outlet, forming a dual cooling path for the inner and outer sides of the stator core.

[0011] The following are further optimizations of the above technical solution by this utility model:

[0012] The spiral grooves on the outer circular surface of the motor rotor have a continuous spiral structure.

[0013] Further optimization: The inner wall of the cooling sleeve is tightly fitted to the outer circular surface of the stator core, and an interference fit is adopted between the cooling sleeve and the stator core.

[0014] Further optimization: The spiral direction of the spiral flow channel of the cooling jacket is opposite to the spiral direction of the spiral groove of the motor rotor.

[0015] Further optimization: The medium guiding notch of the cooling jacket is an axially open structure.

[0016] Further optimization: The cooling jacket has multiple mounting holes arranged in a ring at the end near the medium guiding notch, which are used to fix the cooling jacket to the compressor housing.

[0017] In this invention, the spiral groove on the outer circle of the motor rotor actively pushes the refrigerant as the rotor rotates, causing it to flow rapidly and directionally in the air gap, enhancing convective heat transfer without requiring an additional power source. At the same time, it increases the air gap flow area and improves heat dissipation efficiency.

[0018] In this invention, the cooling jacket, spiral flow channel, and medium guiding notch on the outer circle of the stator core cooperate to guide the refrigerant to flow around the core, forming a dual cooling path to quickly remove heat and prevent the stator core and windings from overheating, thus ensuring efficient operation.

[0019] The spiral groove and spiral flow channel design of this invention optimizes the flow path of the refrigerant in the compressor, reduces frictional resistance, and reduces the energy required to drive the refrigerant; at the same time, efficient cooling ensures the working efficiency of the motor and compressor, avoids the additional energy consumption caused by performance degradation, and achieves energy-saving operation of the system.

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the cooling sleeve structure in an embodiment of this utility model;

[0024] Figure 3 This is a front view of the motor rotor in an embodiment of this utility model.

[0025] 1-Compressor housing; 2-Stator core; 3-Motor rotor; 4-Refrigerant inlet; 5-Refrigerant outlet; 6-Spiral groove; 7-Cooling jacket; 71-Spiral flow channel; 72-Medium guiding notch; 8-Mounting hole. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figure 1-3 As shown, a cooling structure for a magnetic levitation refrigerant compressor includes a compressor housing 1, a stator core 2, and a motor rotor 3. The compressor housing 1 is provided with a refrigerant inlet 4 and a refrigerant outlet 5; an air gap is formed between the stator core 2 and the motor rotor 3.

[0028] A spiral groove 6 is machined on the outer circular surface of the motor rotor 3 and located in the air gap area, which is used to push the refrigerant flow and increase the air gap flow area when the motor rotor 3 rotates.

[0029] The stator core 2 is fitted with a cooling sleeve 7 on its outer circle. The outer circle of the cooling sleeve 7 is machined with a spiral flow channel 71, and the cooling sleeve 7 is provided with a medium guiding notch 72 on one side corresponding to the air gap outlet position, which is used to guide the refrigerant flowing through the air gap into the inlet of the spiral flow channel 71.

[0030] After entering through the refrigerant inlet 4, the refrigerant flows through the spiral flow channel 71 of the air gap and the cooling jacket 7 in sequence, and finally flows out from the refrigerant outlet 5, forming a dual cooling path for the inner and outer sides of the stator core 2.

[0031] With this design, firstly, the outer spiral groove 6 of the motor rotor 3 actively pushes the refrigerant as the rotor rotates, causing it to flow rapidly and directionally in the air gap, enhancing convective heat transfer without the need for an additional power source. At the same time, it increases the air gap flow area and improves heat dissipation efficiency.

[0032] Secondly, the cooling jacket 7, the spiral flow channel 71, and the medium guiding notch 72 on the outer circle of the stator core 2 cooperate to guide the refrigerant to flow around the core, forming a dual cooling path and improving heat dissipation efficiency.

[0033] Furthermore, the spiral groove 6 and spiral flow channel 71 design optimize the flow path of the refrigerant in the compressor, reduce flow resistance, and reduce the energy required to drive the refrigerant; at the same time, efficient cooling ensures the working efficiency of the motor and compressor, avoids the additional energy consumption caused by performance degradation, and achieves energy-saving operation of the system.

[0034] Finally, the cooling structure integrates the spiral groove 6 and cooling jacket 7 into the key components of the compressor without adding extra volume space. It achieves a compact structure while ensuring efficient cooling, thus facilitating the installation and layout of the compressor in various equipment and adapting to the space requirements of different application scenarios.

[0035] The spiral groove 6 on the outer circular surface of the motor rotor 3 has a continuous spiral structure.

[0036] This design, firstly, allows the continuous spiral groove 6 to apply a stable force to the refrigerant as the motor rotor 3 rotates, driving the refrigerant to flow at high speed in the air gap, greatly enhancing the active cooling effect and efficiently removing heat from the motor rotor 3 and stator core 2.

[0037] Secondly, its uninterrupted spiral shape avoids fluid turbulence, reduces the flow resistance and friction loss of refrigerant in the air gap, reduces drive energy consumption, reduces noise, and achieves energy-saving operation.

[0038] Furthermore, increasing the contact area between the rotor and the refrigerant promotes heat exchange, ensures uniform refrigerant distribution, avoids localized overheating, improves motor operating stability, and extends service life.

[0039] Finally, continuous processing technology can be used in manufacturing to simplify processes, shorten working hours, reduce scrap rates, control costs, and improve production efficiency and market competitiveness.

[0040] In this embodiment, the helical groove 6 of the motor rotor 3 is designed with equal pitch.

[0041] In addition to this embodiment, the helical groove 6 of the motor rotor 3 may adopt a variable pitch design. When a variable pitch design is adopted, the pitch of the helical groove 6 gradually increases or decreases from one end of the axial direction of the motor rotor 3 to the other end.

[0042] In this embodiment, the depth of the spiral groove 6 is 0.2mm-0.5mm, preferably 0.35mm; the spiral angle is 30°-60°, preferably 45°.

[0043] The inner wall of the cooling sleeve 7 is tightly fitted to the outer circular surface of the stator core 2, and the cooling sleeve 7 and the stator core 2 are interference fit.

[0044] This design, firstly, reduces contact thermal resistance through a tight fit, and secondly, enhances heat conduction through interference fit and welding fixation, allowing the heat from the stator core 2 to be quickly transferred to the cooling jacket 7 and carried away by the refrigerant, ensuring stable operation of the compressor.

[0045] Secondly, the interference fit makes the cooling jacket 7 and the stator core 2 a stable whole, resisting vibration and impact, preventing component displacement and loosening, reducing the risk of refrigerant leakage and cooling failure, and reducing maintenance costs.

[0046] Furthermore, the tight fit and fixing method ensures the sealing of the cooling jacket 7, prevents refrigerant leakage, maintains system pressure and flow, guarantees cooling effect, and eliminates safety and pollution hazards.

[0047] Finally, the cooling jacket 7 is tightly arranged around the stator core 2, making efficient use of space, making the compressor structure compact, reducing its size and weight, and facilitating installation in different scenarios.

[0048] The spiral direction of the spiral flow channel 71 of the cooling jacket 7 is opposite to the spiral direction of the spiral groove 6 of the motor rotor 3.

[0049] This design firstly causes strong disturbance to the refrigerant due to the reverse force, breaking the boundary layer, increasing contact with the wall, improving heat transfer efficiency, and ensuring cooling effect under high load.

[0050] Secondly, by changing the rotor speed, the cooling intensity can be flexibly adjusted using unique flow characteristics. Low load speed reduces energy consumption, while high load speed increases to meet heat dissipation requirements, thereby improving system adaptability and operating efficiency.

[0051] The medium guiding notch 72 of the cooling jacket 7 is an axially open structure.

[0052] This design, firstly, provides direct guidance for the refrigerant through the axially open medium guiding notch 72, allowing it to quickly and smoothly enter the spiral flow channel 71 along the axial direction of the stator core 2, avoiding flow turbulence, ensuring that the refrigerant flows efficiently along the preset path, and improving cooling efficiency.

[0053] Secondly, compared to other openings, the axial opening allows the refrigerant to enter the cooling jacket 7 more smoothly, reducing local resistance, avoiding turbulent flow, reducing friction loss, reducing compressor drive energy consumption, and improving operating economy.

[0054] Furthermore, compared to other openings, the axial opening allows the refrigerant to enter the cooling jacket 7 more smoothly, reducing local resistance, avoiding turbulent eddies, reducing frictional losses, reducing compressor drive energy consumption, and improving operating economy.

[0055] Finally, the axial opening structure is simple and can be quickly formed using conventional machining, reducing processing difficulty and cost and improving production efficiency; at the same time, it facilitates technicians to inspect the inside of the cooling jacket 7, reducing maintenance time and difficulty and ensuring stable operation of the compressor.

[0056] The cooling jacket 7 has a plurality of mounting holes 8 arranged in a ring at the end near the medium guiding notch 72. The mounting holes 8 are used to fix the cooling jacket 7 to the compressor housing 1.

[0057] The number of mounting holes 8 is 8 to 12, and they are evenly distributed circumferentially along the end of the cooling sleeve 7.

[0058] The spiral flow channel 71 of the cooling jacket 7 has a rectangular cross-section.

[0059] This design, firstly, increases the contact area with the refrigerant on the four sides of the rectangle, improving heat dissipation; the fluid disturbances caused by its corners break the boundary layer, enhancing heat and mass transfer.

[0060] Secondly, it has strong compressive strength, can evenly distribute pressure, and reduce stress concentration; the flat sides facilitate connection and fixation with other components, ensuring stable operation of the cooling system.

[0061] In this embodiment, the rectangular cross-sectional height of the spiral channel 71 is 2mm-5mm, preferably 3.5mm; the pitch is 5mm-10mm, preferably 7.5mm.

[0062] The cooling jacket 7 is made of a metal material with good thermal conductivity, preferably an aluminum alloy or a copper alloy.

[0063] This design, firstly, leverages the excellent thermal conductivity of aluminum and copper alloys. Copper alloys transfer heat quickly, while aluminum alloys combine thermal conductivity with lightweight properties, enabling rapid heat transfer from the stator core 2 to the flow channel wall. This allows for efficient heat dissipation via the refrigerant, ensuring stable operation of the compressor under high loads.

[0064] Secondly, aluminum alloys have high strength and corrosion resistance, while copper alloys have excellent toughness and wear resistance. They can withstand external forces under complex working conditions, maintain the integrity of the flow channel structure, and stably cooperate with other components, reducing the risk of failure and extending the equipment life.

[0065] Furthermore, it has excellent processing performance and can be made into complex flow channels through a variety of conventional processes, which simplifies production, improves efficiency, reduces waste, and ensures sufficient market supply and stable prices, effectively controlling costs and enhancing product competitiveness.

[0066] The starting end of the spiral flow channel 71 of the cooling jacket 7 is connected to the medium guiding notch 72, and the ending end is connected to the refrigerant outlet 5.

[0067] In this embodiment, the spiral flow channel 71 has 6-8 turns to extend the flow path of the refrigerant.

[0068] In addition to this embodiment, the number of turns of the spiral flow channel 71 can be set according to actual needs.

[0069] Working principle:

[0070] The low-temperature refrigerant enters the system through the refrigerant inlet 4 on the compressor casing 1, and first flows to the air gap area between the stator core 2 and the motor rotor 3.

[0071] After startup, the motor rotor 3 rotates at high speed, and the continuous spiral grooves 6 on its outer circular surface push the refrigerant to flow spirally along the air gap. This not only increases the air gap flow area and improves the flow rate, but also absorbs the heat from the rotor and stator core 2 through direct contact, completing the first stage of cooling. The direction of the spiral grooves 6 determines the axial flow direction of the refrigerant.

[0072] Subsequently, the refrigerant enters the spiral flow channel 71 through the axial medium guide notch 72 of the cooling jacket 7. When it flows along the spiral path, the secondary flow generated by the spiral motion enhances heat transfer and efficiently absorbs the heat from the outside of the stator core 2, forming a second cooling.

[0073] Finally, the refrigerant that has completed the dual heat exchange is discharged from the end of the spiral flow channel 71 of the cooling jacket 7 through the refrigerant outlet 5, enters the external condensation cycle to cool and depressurize, and then flows back to the compressor, repeating the cycle to achieve continuous cooling.

[0074] For those skilled in the art, any changes, modifications, substitutions, and variations made to the implementation methods without departing from the principles and spirit of this utility model, based on the teachings of this utility model, still fall within the protection scope of this utility model.

Claims

1. A cooling structure for a magnetic levitation refrigerant compressor, comprising a compressor housing (1), a stator core (2), and a motor rotor (3), wherein the compressor housing (1) is provided with a refrigerant inlet (4) and a refrigerant outlet (5); an air gap is formed between the stator core (2) and the motor rotor (3); characterized in that: The outer circular surface of the motor rotor (3) and located in the air gap area are machined with a spiral groove (6) to drive the refrigerant flow and increase the air gap flow area when the motor rotor (3) rotates; The stator core (2) is fitted with a cooling sleeve (7) on its outer circle. The outer circle of the cooling sleeve (7) is machined with a spiral flow channel (71), and the cooling sleeve (7) is provided with a medium guiding notch (72) on one side corresponding to the air gap outlet position, which is used to guide the refrigerant flowing through the air gap into the inlet of the spiral flow channel (71). After entering through the refrigerant inlet (4), the refrigerant flows through the spiral flow channel (71) of the air gap and the cooling jacket (7) in sequence, and finally flows out from the refrigerant outlet (5), forming a dual cooling path for the inner and outer sides of the stator core (2).

2. The cooling structure of a magnetic levitation refrigerant compressor according to claim 1, characterized in that: The spiral groove (6) on the outer circular surface of the motor rotor (3) is a continuous spiral structure.

3. The cooling structure of a magnetic levitation refrigerant compressor according to claim 1, characterized in that: The inner wall of the cooling sleeve (7) is closely fitted to the outer circular surface of the stator core (2), and the cooling sleeve (7) and the stator core (2) are fitted with an interference fit.

4. The cooling structure of a magnetic levitation refrigerant compressor according to claim 1, characterized in that: The spiral direction of the spiral flow channel (71) of the cooling jacket (7) is opposite to the spiral direction of the spiral groove (6) of the motor rotor (3).

5. The cooling structure of a magnetic levitation refrigerant compressor according to claim 1, characterized in that: The medium guiding notch (72) of the cooling jacket (7) is an axially open structure.

6. The cooling structure of a magnetic levitation refrigerant compressor according to claim 1, characterized in that: The cooling jacket (7) has multiple mounting holes (8) arranged in a ring at the end near the medium guide notch (72). The mounting holes (8) are used to fix the cooling jacket (7) to the compressor housing (1).

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