A direct-drive oil-free scroll compressor

Abstract

This utility model relates to the field of oil-free scroll compressor technology, specifically a direct-drive oil-free scroll compressor. It includes a stationary scroll, a moving scroll, a support frame, a motor, and a cooling fan. The moving scroll is positioned between the stationary scroll and the support frame, and the scroll teeth of the moving scroll mesh with those of the stationary scroll. The moving scroll moves under the drive of the motor's main shaft and is simultaneously constrained by three cranks, performing planar vortex motion. The motor has guide holes at both ends. Driven by the cooling fan, air flows through these guide holes to cool the motor. The cooling fan blows hot air into a metal duct with heat dissipation fins for cooling, and then cools the moving and stationary scrolls. By using a single cooling fan in conjunction with the metal duct, both the compressor motor and the moving and stationary scrolls can be cooled simultaneously, improving the overall operational reliability of the compressor.

Description

Technical Field

[0001] This utility model relates to the field of oil-free scroll compressor technology, specifically to a direct-drive oil-free scroll compressor. Background Technology

[0002] Oil-free scroll compressors, due to their unique motion principle, can continuously supply compressed gas. Compared with traditional piston compressors, they have the advantages of high efficiency, long life and stable gas output, and are highly favored in the fields of medical devices and industrial braking.

[0003] Existing belt-driven oilless scroll compressors use a standard universal motor driven by a belt. Although this avoids the cumbersome steps of custom motor development, it suffers from problems such as low efficiency, reduced drive accuracy due to belt wear, and insufficient torque transmitted by the motor through the belt.

[0004] On the other hand, existing oil-free scroll compressor motors typically rely solely on heat dissipation fins on the motor housing surface for cooling. This structure offers poor heat dissipation. The motor, providing stable speed and torque to the scroll compressor head, generates a significant amount of heat. If not cooled promptly, this can lead to reduced motor speed, performance degradation, or even damage. Furthermore, the rotating and stationary scrolls generate substantial heat during air compression. The meshing precision of the scroll bodies is typically at the micrometer level. If parts deform due to heat, collisions or seizing can occur during meshing, causing component failure or damage. Therefore, simultaneously addressing the heat dissipation of both the motor and the rotating and stationary scrolls in an oil-free scroll compressor is crucial for extending the overall lifespan of the machine. Utility Model Content

[0005] To address the aforementioned problems in the prior art, this utility model provides a direct-drive oil-free scroll compressor. It employs a direct-drive motor to solve the problems of low efficiency, poor precision, and insufficient torque in traditional belt-driven oil-free scroll compressors. Furthermore, it optimizes the overall heat dissipation structure of the scroll compressor, improves the reliability of key components, and extends the lifespan of the oil-free scroll compressor.

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include: An oil-free scroll compressor with direct motor drive includes a moving scroll, a moving scroll connecting seat, a stationary scroll, a bracket, a large balance block, a small balance block, a crank, an eccentric main shaft, a motor, a dust filter, a metal duct, and a cooling fan. The moving scroll and the moving scroll connecting seat are fixedly connected to form a moving scroll assembly; The vortex teeth of the moving vortex disk and the stationary vortex disk mesh with each other, forming multiple pairs of meshing volume cavities inside.

[0007] As a further improvement to the above technical solution: Two guide holes are provided at both ends of the motor, located at the end of the motor housing furthest from the moving scroll and at the outer circumference of the motor housing, respectively. When the cooling fan is running, air flows in from the guide hole at the motor end under the negative pressure of the cooling fan, passes through the motor interior to cool it, and then flows into the cooling fan from the guide hole on the outer wall of the motor. The cooling fan blows the hot air into the metal duct for cooling, and then cools the moving and stationary scrolls. A direct-drive motor is used to solve the problems of low efficiency, poor precision, and insufficient torque in traditional belt-driven oil-free scroll compressors. The overall heat dissipation structure of the scroll compressor is optimized, improving the reliability of key components and extending the life of the oil-free scroll compressor.

[0008] Preferably, the metal duct has multi-layered heat dissipation fins inside.

[0009] Preferably, the moving scroll plate has a first sealing groove and a second sealing groove at the tip of its scroll teeth, and the stationary scroll plate has a third sealing groove and a fourth sealing groove at the tip of its scroll teeth. Each of the first, second, third, and fourth sealing grooves has a first sealing strip. The depth of the first sealing groove is 1.5 to 2 times the depth of the second sealing groove, and the thickness of the first sealing strip in the first sealing groove is 1.5 to 2 times the thickness of the first sealing strip in the second sealing groove. The depth of the third sealing groove is 1.5 to 2 times the depth of the fourth sealing groove, and the thickness of the first sealing strip in the third sealing groove is 1.5 to 2 times the thickness of the first sealing strip in the fourth sealing groove.

[0010] Preferably, the outer ring of the vortex of the static vortex disk is provided with a circular fifth sealing groove, and a second sealing strip and an O-shaped soft silicone elastomer are provided in the fifth sealing groove, with the O-shaped soft silicone elastomer placed at the bottom of the second sealing strip.

[0011] Preferably, the motor spindle has an eccentric structure, with the eccentric output end connected to the moving scroll assembly; the motor spindle is connected to the large balance block near the eccentric output end, and the end of the motor spindle is connected to the small balance block.

[0012] This utility model provides a direct-drive oil-free scroll compressor. It has the following advantages: The motor described in this application has guide holes at both ends. When the cooling fan is running, air enters from the guide holes at the ends due to the negative pressure of the suction. The cooler air flows through the inside of the motor, which can cool the compressor motor. The air then flows out from the motor guide hole near the cooling fan end. This structure can solve the problems of reduced speed and increased vibration and noise caused by excessive motor temperature, which affect the performance of the compressor, and improve the efficiency and reliability of the motor.

[0013] The metal duct described in this application has layered heat dissipation fins inside. These fins cool the hot air drawn in from the motor as it passes through the duct. The fins are connected to the metal duct, rapidly transferring heat to the duct and then into the surrounding air. The cooled air, after passing through the duct, is then delivered to the connection between the moving and stationary scroll plates, providing cooling for both. This structure allows for simultaneous cooling of the motor and the moving and stationary scroll plates within the same cooling system, improving the overall mechanical efficiency of the machine.

[0014] The rotating and stationary scroll sealing strip described in this application adopts a segmented and thicknessed structure. A thinner sealing strip is used near the low-pressure end of the air inlet, which can float during operation to ensure axial sealing of the rotating and stationary scrolls. A thicker sealing strip is used near the high-pressure end of the exhaust port to prevent deformation of the sealing strip under high pressure, which would affect the sealing performance. At the same time, the compressed gas in the high-pressure chamber enters the bottom of the sealing strip through the side wall of the sealing strip, causing the sealing strip to float and ensuring axial sealing.

[0015] The outermost ring of the vortex body of the stationary vortex disk described in this application is provided with a circular sealing groove. The circular sealing groove is provided with a sealing strip and an O-ring soft silicone elastomer. The O-ring soft silicone elastomer is below the sealing strip and can always support the top surface of the sealing strip to contact the surface of the moving vortex disk, preventing unfiltered air, oil stains, impurities, water vapor, etc. from entering the cavity of the moving and stationary vortex bodies from the side, and can keep the vortex cavity always clean and oil-free. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the direct-drive oil-free scroll compressor of this embodiment; Figure 2 This is a schematic diagram of the moving scroll structure in this embodiment; Figure 3 This is a schematic diagram of the static vortex disk structure in this embodiment; Figure 4 This is a schematic diagram of the fifth sealing groove of the static vortex disk in this embodiment; Figure 5 This is a schematic diagram of the support structure in this embodiment; Figure 6 This is a schematic diagram of the large balance block structure in this embodiment; Figure 7 This is a schematic diagram of the small balance block structure in this embodiment; Figure 8 This is a schematic diagram of the crankshaft structure in this embodiment; Figure 9 This is a schematic diagram of the eccentric spindle structure in this embodiment; Figure 10 This is a schematic diagram of the motor housing structure in this embodiment; Figure 11 This is a schematic diagram of the metal duct structure in this embodiment.

[0017] In the diagram: 1. Moving scroll; 2. Moving scroll connecting seat; 3. Stationary scroll; 4. Bracket; 5. Large balance block; 6. Small balance block; 7. Crank; 8. Eccentric spindle; 9. Motor; 10. Dustproof net; 11. Metal air duct; 12. Cooling fan; 13. Guide hole; 14. First sealing groove; 15. Second sealing groove; 16. Third sealing groove; 17. Fourth sealing groove; 18. First sealing strip; 19. Fifth sealing groove; 20. Second sealing strip; 21. O-ring soft silicone elastomer. Detailed Implementation

[0018] 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.

[0019] Please refer to this Figure 1-11 In this embodiment of the present invention, a direct-drive oil-free scroll compressor with a motor 9 includes a moving scroll 1 and a moving scroll connecting seat 2 disposed on the moving scroll 1. The moving scroll 1 and the moving scroll connecting seat 2 are locked together by positioning pins and screws and placed as a whole assembly on a bracket 4. The moving scroll connecting seat 2 has a bearing hole for the moving scroll 1 assembly at its center away from the moving scroll end, which houses a cylindrical roller bearing. The moving scroll connecting seat 2 also has three crank bearing holes 7 for connecting the cranks 7 of the anti-rotation mechanism. The vortex body end of the moving vortex assembly 1 is connected to the stationary vortex 3. The stationary vortex 3 is connected to the bracket 4 by positioning pins and screws. The end of the bracket 4 away from the stationary vortex 3 is connected to the motor 9. The end of the bracket 4 near the moving vortex assembly 1 is equipped with an anti-rotation mechanism, which consists of three eccentric cranks 7. The eccentricity of the cranks 7 is the same as the eccentricity of the eccentric main shaft 8 of the motor 9. One end of the cranks 7 is inserted into the bearing holes of the three cranks 7 of the moving vortex connecting seat 2, and the other end is inserted into the corresponding bearing holes of the three cranks 7 on the bracket 4, thus forming the anti-rotation mechanism. The motor 9 drives the moving vortex assembly 1 to move through the eccentric main shaft 8. At the same time, under the action of the anti-rotation mechanism, the rotation of the moving vortex assembly 1 is restricted, thus performing planar vortex motion. On the eccentric main shaft 8 of the motor 9, a large balance block 5 is set at the end near the moving vortex assembly 1, and a small balance block 6 is set at the other end of the eccentric main shaft 8. The large balance block 5 and the small balance block 6 are distributed at 180° at both ends of the eccentric main shaft 8. The large balance block 5 is fixed to the eccentric main shaft 8 by countersunk screws, and the small balance block 6 is fixed to the tail end of the eccentric main shaft 8 by flat key and screws. The large and small balance blocks 6 balance the moment of inertia of the moving plate assembly during the operation of the compressor.

[0020] The rotating scroll 1 has a first sealing groove 14 and a second sealing groove 15 at the top of its scroll teeth. The depth of the first sealing groove 14 is 1.5 to 2 times the depth of the second sealing groove 15. The first sealing groove 14 and the second sealing groove 15 are fitted with a first sealing strip 18. The stationary scroll 3 has a third sealing groove 16 and a fourth sealing groove 17 at the top of its scroll teeth. The depth of the third sealing groove 16 is 1.5 to 2 times the depth of the fourth sealing groove 17. The third sealing groove 16 and the fourth sealing groove 17 are fitted with a first sealing strip 18. On the outside of the scroll teeth of the stationary scroll 3, there is a circular fifth sealing groove 19. The fifth sealing groove 19 contains a second sealing strip 20 and an O-ring soft silicone elastomer 21. The O-ring soft silicone elastomer 21 is located below the second sealing strip 20. Driven by the eccentric spindle 8, the scroll teeth of the moving scroll 1 mesh with the scroll teeth of the stationary scroll 3, forming multiple continuous crescent-shaped closed cavities. The pressure in the inner closed cavity is greater than the pressure in the outer closed cavity. Some of the compressed air in the high-pressure side cavity will enter the sealing groove, thereby blowing the sealing strip up and floating, achieving the axial sealing effect of the moving scroll 1 and the stationary scroll 3. At the same time, the O-ring soft silicone elastomer 21 in the fifth sealing groove 19 on the stationary scroll 3 always supports the second sealing strip 20 in contact with the large surface of the moving scroll 1, ensuring the sealing inside the moving and stationary scroll cavities and preventing unfiltered air, oil, impurities, water vapor, etc. from entering the moving and stationary scroll cavities from the side, thus maintaining a clean and oil-free environment inside the scroll cavities.

[0021] During operation, the oil-free scroll compressor generates significant heat due to the rotation of the motor 9 driving the moving scroll 1 assembly. Simultaneously, the meshing of the scroll teeth of the moving scroll 1 and the stationary scroll 3 with the compressed air also generates considerable heat. Furthermore, the friction between the top sealing strips of the scroll teeth on both the moving and stationary scrolls also generates significant heat. Therefore, it is essential to provide cooling for the motor 9 and the moving and stationary scrolls 1 and 3. In this embodiment, guide holes 13 are provided at both ends of the motor 9 housing. The cooling fan 12 draws in air through the guide holes 13 at the tail end of the motor 9, creating an airflow channel inside the motor 9. This rapid airflow carries away the internal heat of the motor 9, thus achieving the purpose of cooling it. At the connection between the cooling fan 12 and the metal duct 11, multi-layered heat dissipation fins are built into the metal duct 11. The cooling fan 12 blows the hot air from the motor 9 into the heat dissipation fins of the metal duct 11. The heat dissipation fins are connected to the metal duct 11, thereby transferring heat to the outside of the metal duct 11 in a timely manner, achieving cooling of the hot air. The cooled air is then blown through the metal duct 11 to the moving scroll 1 and the stationary scroll 3, thereby cooling the moving scroll 1 and the stationary scroll 3. This allows for synchronous heat dissipation of the motor 9 and the moving scroll 1 and the stationary scroll 3, improving the operating efficiency of the motor 9. At the same time, timely cooling of the moving scroll 1 and the stationary scroll 3 prevents thermal deformation of the parts, ensures the meshing of the scroll teeth of the moving scroll 1 and the stationary scroll 3, and improves the overall reliability of the compressor.

Claims

1. A direct-drive oil-free scroll compressor, characterized in that: Includes moving scroll (1), moving scroll connecting seat (2), stationary scroll (3), bracket (4), large balance block (5), small balance block (6), crank (7), eccentric spindle (8), motor (9), dustproof net (10), metal air duct (11), and cooling fan (12); The moving scroll (1) and the moving scroll (1) connecting seat are fixedly connected to form the moving scroll (1) assembly; The vortex teeth of the moving vortex disk (1) and the stationary vortex disk (3) mesh with each other, forming multiple pairs of meshing volume cavities inside. The cooling fan (12) is located at the tail end of the motor (9). The motor (9) has two guide holes (13) at both ends. The guide holes (13) are located at the end of the motor (9) housing away from the moving scroll (1) and the outer circle of the motor (9) housing, respectively. When the cooling fan (12) is running, under the negative pressure suction of the cooling fan (12), air flows in from the guide hole (13) at the end of the motor (9), passes through the inside of the motor (9), and cools the motor (9). The air flows into the cooling fan (12) from the guide hole (13) on the outer wall of the motor (9). The cooling fan (12) blows the hot air it draws in onto the metal air duct (11) for cooling, and then cools the moving scroll (1) and the stationary scroll (3).

2. The direct-drive oil-free scroll compressor according to claim 1, characterized in that: The metal duct (11) is equipped with multi-layer heat dissipation fins.

3. The direct-drive oil-free scroll compressor according to claim 1, characterized in that: The moving volute (1) has a first sealing groove (14) and a second sealing groove (15) at the top of the volute teeth, and the stationary volute (3) has a third sealing groove (16) and a fourth sealing groove (17) at the top of the volute teeth. Each of the first sealing groove (14), the second sealing groove (15), the third sealing groove (16), and the fourth sealing groove (17) is provided with a first sealing strip (18). The depth of the first sealing groove (14) is 1.5 to 2 times the depth of the second sealing groove (15), and the thickness of the first sealing strip (18) in the first sealing groove (14) is 1.5 to 2 times the thickness of the first sealing strip (18) in the second sealing groove (15). The depth of the third sealing groove (16) is 1.5 to 2 times the depth of the fourth sealing groove (17), and the thickness of the first sealing strip (18) in the third sealing groove (16) is 1.5 to 2 times the thickness of the first sealing strip (18) in the fourth sealing groove (17).

4. The direct-drive oil-free scroll compressor according to claim 1, characterized in that: The outer ring of the vortex of the static vortex disk (3) is provided with a circular fifth sealing groove (19). The fifth sealing groove (19) is provided with a second sealing strip (20) and an O-shaped soft silicone elastomer (21). The O-shaped soft silicone elastomer (21) is placed at the bottom of the second sealing strip (20).

5. The direct-drive oil-free scroll compressor according to claim 1, characterized in that: The motor (9) spindle has an eccentric structure, and the eccentric output end is connected to the moving scroll (1) assembly; the motor (9) spindle is connected to the large balance block (5) near the eccentric output end, and the end of the motor (9) spindle is connected to the small balance block (6).

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