Dry type oil-free screw compressor structure driven by high-speed motor

Abstract

The utility model discloses a dry-type oil-free screw compressor structure driven by a high-speed motor, and relates to the field of liquid variable-capacity machinery, the dry-type oil-free screw compressor structure comprises the high-speed motor, a compressor head and a driver, the compressor head comprises a first-stage compressor head and a second-stage compressor head, an output shaft of the high-speed motor is directly connected with an input shaft of the first-stage compressor head, and an output shaft of the second-stage compressor head is directly connected with an output shaft of the second-stage compressor head; and the driver is arranged between the output shaft of the high-speed motor and the input shaft of the secondary compressor head for transmission. The compressor has the effects of being high in transmission efficiency and low in noise, the size of the driver is greatly reduced, and the material cost and the machining cost can be greatly saved.

Description

Technical Field

[0001] This application relates to the field of liquid displacement machinery, and in particular to a structure of a dry oil-free screw compressor driven by a high-speed motor. Background Art

[0002] A dry oil-free screw compressor is an air compressor, and its main components include a screw main unit, an intake system, an oil injection and oil-gas separation system, a cooling system, an exhaust system, and a control system, etc. It uses a pair of meshing male and female rotors (screws) to rotate in a cylinder, so that the air between the rotor tooth grooves continuously generates periodic volume changes, and the air is transported from the suction side to the output side along the rotor axis, realizing the whole process of suction, compression, and exhaust of the screw air compressor. During the compression process of the air compressor, there is no participation of oil. Dry screw air compressors have the advantages of high efficiency, reliability, and low maintenance, and are widely used in various industrial fields, such as electric power, chemical industry, medicine, food, etc. Compared with traditional piston air compressors, dry screw air compressors have higher compression efficiency and lower energy consumption, and at the same time, the noise and vibration are also smaller, and the service life is longer.

[0003] In the related art, generally, a 2-pole or 4-pole motor is used to drive a dry oil-free screw compressor, and the motor speed is generally between 1500 and 3600 rpm. Due to the characteristics of the dry screw head, the speed is generally between 8000 and 30000 rpm. There is a large speed difference between the low-speed motor and the head speed. Therefore, generally, a large gear ratio is used for speed increase, resulting in relatively large sizes of devices such as gears and gearboxes.

[0004] In view of the above-related art, the inventor designed a structure of a dry oil-free screw compressor driven by a high-speed motor. Utility Model Content

[0005] This application provides a structure of a dry oil-free screw compressor driven by a high-speed motor, which has the effects of high compressor transmission efficiency and low noise, and the size of the transmission is greatly reduced, and the material cost and processing cost can be greatly saved.

[0006] The structure of a dry oil-free screw compressor driven by a high-speed motor provided by this application adopts the following technical solutions:

[0007] A structure of a dry oil-free screw compressor driven by a high-speed motor includes a high-speed motor, a compressor head, and a transmission. The compressor head includes a first-stage compressor head and a second-stage compressor head. The output shaft of the high-speed motor is directly connected to the input shaft of the first-stage compressor head, and the transmission is arranged to drive between the output shaft of the high-speed motor and the input shaft of the second-stage compressor head.

[0008] By adopting the above technical solution, the high-speed motor directly drives the first-stage compressor head to rotate, and the second-stage compressor head is driven by a transmission; the direct connection design between the high-speed motor and the first-stage compressor head has the advantages of high transmission efficiency and low noise. At the same time, after adopting the high-speed motor, the motor has a high power density, and the size of the motor is much smaller than that of a conventional motor, so the overall size of the compressor can be greatly reduced, and a high-power compressor can be designed for miniaturization of the whole machine; the high-speed motor has many advantages, such as high motor efficiency, large starting torque, fast dynamic response, and more reliable liquid cooling for heat dissipation.

[0009] Optionally, the transmission includes a first-stage transmission gear and a second-stage transmission gear. The output shaft of the high-speed motor and the input shaft of the first-stage compressor head are directly connected by a coupling; the first-stage transmission gear is coaxially fixed to the output shaft of the high-speed motor, the second-stage transmission gear is coaxially fixed to the input shaft of the second-stage compressor head, and the first-stage transmission gear and the second-stage transmission gear are engaged for transmission.

[0010] By adopting the above technical solution, at a relatively high rated speed of the high-speed motor, a gear with a very small speed ratio can be used between the dry screw compressor head and the motor, and the sizes of the speed-changing gear and the gearbox can be greatly reduced, and the material cost and processing cost can be greatly saved.

[0011] Optionally, the high-speed motor adopts a double-output shaft design; one output shaft of the high-speed motor is directly connected to the input shaft of the first-stage compressor head by a coupling, and the other output shaft of the high-speed motor is in gear transmission with the input shaft of the second-stage compressor head through the first-stage transmission gear and the second-stage transmission gear.

[0012] By adopting the above technical solution, the double-output shaft design can be effective.

[0013] Optionally, the transmission further includes a housing, a first transmission shaft and a second transmission shaft; the first transmission shaft and the second transmission shaft are rotatably installed on the housing, and the first-stage transmission gear and the second-stage transmission gear are respectively fixed on the first transmission shaft and the second transmission shaft; one end of the first transmission shaft is directly connected to the output shaft of the high-speed motor, and the other end of the first transmission shaft is directly connected to the input shaft of the first-stage compressor head by a coupling; one end of the second transmission shaft is directly connected to the input shaft of the second-stage compressor head by a coupling.

[0014] Optionally, the high-speed motor adopts a double-output shaft design; the output shafts at both ends of the high-speed motor are directly connected to the first-stage compressor head and the second-stage compressor head by couplings respectively.

[0015] Optionally, the rotational speed of the high-speed motor is 7000 - 25000 rpm.

[0016] Optionally, a coolant flow passage is provided on the outer shell of the high-speed motor.

[0017] Optionally, it further includes a frequency converter for controlling the high-speed motor.

[0018] By adopting the above technical solution, the motor power is adjusted by the frequency converter.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] 1. A dry oil-free screw compressor structure driven by a high-speed motor disclosed in the present application. The high-speed motor directly drives the first-stage compressor head to rotate, and the second-stage compressor head is driven by a transmission. The direct connection design between the high-speed motor and the first-stage compressor head has the advantages of high transmission efficiency and low noise. At the same time, after adopting the high-speed motor, the motor power density is high, the size of the motor is much smaller than that of a conventional motor, and the overall size of the compressor can be significantly reduced, enabling the whole machine of a high-power compressor to be miniaturized. The high-speed motor has many advantages, such as high motor efficiency, large starting torque, fast dynamic response, and more reliable liquid cooling for heat dissipation.

[0021] 2. At a relatively high rated speed of the high-speed motor, a gear with a very small speed ratio can be used between the dry screw compressor head and the motor, and the sizes of the speed-changing gear and the gearbox can be significantly reduced, greatly saving the material cost and processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of Embodiment 1 of the present application;

[0023] Figure 2 is a schematic diagram of the overall structure of Embodiment 2 of the present application;

[0024] Figure 3 is a schematic diagram of the overall structure of Embodiment 3 of the present application;

[0025] Figure 4 is a schematic diagram of the overall structure of Embodiment 4 of the present application.

[0026] BRIEF DESCRIPTION OF THE DRAWINGS: 1. High-speed motor; 2. Compressor head; 21. First-stage compressor head; 22. Second-stage compressor head; 3. Transmission; 31. Housing; 32. First transmission shaft; 33. Second transmission shaft; 34. First-stage transmission gear; 35. Second-stage transmission gear; 4. Frequency converter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The embodiments of the present application disclose a dry oil-free screw compressor structure driven by a high-speed motor.

[0028] Embodiment 1

[0029] Referring to Figure 1, A structure of a dry oil-free screw compressor driven by a high-speed motor includes a high-speed motor 1, an inverter 4, a compressor head 2, and a transmission 3; the inverter 4 is connected to the high-speed motor 1 and controls the rotation of the high-speed motor 1; the rotational speed of the high-speed motor 1 is 7000 - 25000 rpm, and the high-speed motor 1 adopts a liquid cooling design, which includes a coolant circulation channel provided on the outer shell of the high-speed motor 1 for circulating coolant to take away the heat generated by the motor.

[0030] The transmission 3 includes a housing 31, a first transmission shaft 32, a second transmission shaft 33, a first-stage transmission gear 34, and a second-stage transmission gear 35; the first transmission shaft 32 and the second transmission shaft 33 are rotatably installed on the housing 31, both ends of the first transmission shaft 32 penetrate the housing 31 as connection ends, and one end of the second transmission shaft 33 close to the compressor head 2 penetrates the housing 31 as a connection end; the first-stage transmission gear 34 and the second-stage transmission gear 35 are respectively fixed on the first transmission shaft 32 and the second transmission shaft 33, and the first-stage transmission gear 34 and the second-stage transmission gear 35 are meshed for transmission, and the transmission ratio is one to one.

[0031] The compressor head 2 includes a first-stage compressor head 21 and a second-stage compressor head 22, and the rotational speeds of the first-stage compressor head 21 and the second-stage compressor head 22 are the same; one end of the first transmission shaft 32 is directly connected to the output shaft of the high-speed motor 1 by a coupling, and the other end of the first transmission shaft 32 is directly connected to the input shaft of the first-stage compressor head 21 by a coupling; one end of the second transmission shaft 33 is directly connected to the input shaft of the second-stage compressor head 22 by a coupling.

[0032] The implementation principle of Embodiment 1 is: The high-speed motor 1 directly drives the first-stage compressor head 21 to rotate through the first transmission shaft 32. The direct connection design between the high-speed motor 1 and the first-stage compressor head 21 has the advantages of high transmission efficiency and low noise. After adopting the high-speed motor 1, the motor power density is high, the motor size is much smaller than that of a conventional motor, and the overall size of the compressor can be significantly reduced, and a high-power compressor can be designed for miniaturization of the whole machine; the high-speed motor 1 has many advantages, such as high motor efficiency, large starting torque, fast dynamic response, and more reliable liquid cooling for heat dissipation. At a relatively high rated rotational speed of the high-speed motor 1, a gear with a very small speed ratio (one to one in this embodiment) can be used between the dry screw compressor head and the motor, and the sizes of the transmission gears (the first-stage transmission gear 34 and the second-stage transmission gear 35) and the gearbox (the housing 31) are significantly reduced, and the material cost and processing cost can be greatly saved.

[0033] Embodiment 2

[0034] Refer to Figure 2, the difference between this embodiment and Embodiment 1 lies in: 1. The high-speed motor 1 adopts a double-output shaft design; 2. There is no transmission 3. The high-speed motor 1 adopts a double-output shaft design; the output shafts at both ends of the high-speed motor 1 are directly connected to the first-stage compressor head 21 and the second-stage compressor head 22 by couplings respectively. The high-speed motor 1 directly driving the first-stage compressor head 21 and the second-stage compressor head 22 can generate higher transmission efficiency and further reduce noise.

[0035] Embodiment 3

[0036] Refer to Figure 3 , the difference between this embodiment and Embodiment 1 lies in: The rotational speed of the second-stage compressor head 22 is faster than that of the first-stage compressor head 21, and the first-stage transmission gear 34 and the second-stage transmission gear 35 are for accelerating transmission.

[0037] Embodiment 4

[0038] Refer to Figure 4 , the difference between this embodiment and Embodiment 1 lies in: 1. The high-speed motor 1 adopts a double-output shaft design; 2. The rotational speed of the second-stage compressor head 22 is faster than that of the first-stage compressor head 21, and the first-stage transmission gear 34 and the second-stage transmission gear 35 are for accelerating transmission; 3. The output shaft at one end of the high-speed motor 1 is directly connected to the input shaft of the first-stage compressor head 21 by a coupling, and the output shaft at the other end of the high-speed motor 1 is in gear transmission with the input shaft of the second-stage compressor head 22 through the first-stage transmission gear 34 and the second-stage transmission gear 35; One end of the transmission shaft 32 close to the second-stage compressor head 22 does not penetrate through the housing 31.

[0039] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A dry oil-free screw compressor structure driven by a high-speed motor, characterized in that: The invention comprises a high-speed motor (1), a compressor head (2) and a transmission (3); the compressor head (2) comprises a primary compressor head (21) and a secondary compressor head (22); the output shaft of the high-speed motor (1) is directly connected to the input shaft of the primary compressor head (21); and the transmission (3) is arranged to transmit between the output shaft of the high-speed motor (1) and the input shaft of the secondary compressor head (22).

2. The high-speed motor-driven dry oil-free screw compressor structure according to claim 1 is characterized in that: The transmission (3) comprises a primary transmission gear (34) and a secondary transmission gear (35); the output shaft of the high-speed motor (1) and the input shaft of the primary compressor head (21) are directly connected by a coupling; the primary transmission gear (34) is coaxially fixed with the output shaft of the high-speed motor (1), the secondary transmission gear (35) is coaxially fixed with the input shaft of the secondary compressor head (22), and the primary transmission gear (34) and the secondary transmission gear (35) are meshed for transmission.

3. The high-speed motor driven dry oil-free screw compressor structure according to claim 2 is characterized in that: The high-speed motor (1) adopts a double-output shaft design; the output shaft at one end of the high-speed motor (1) is directly connected to the input shaft of the first-stage compressor head (21) by a coupling, and the output shaft at the other end of the high-speed motor (1) is gear-driven to the input shaft of the second-stage compressor head (22) via the first-stage transmission gear (34) and the second-stage transmission gear (35).

4. The high-speed motor-driven dry oil-free screw compressor structure according to claim 3 is characterized in that: The transmission device (3) further comprises a housing (31), a transmission shaft 1 (32) and a transmission shaft 2 (33); the transmission shaft 1 (32) and the transmission shaft 2 (33) are rotatably mounted on the housing (31), and the primary transmission gear (34) and the secondary transmission gear (35) are respectively fixed on the transmission shaft 1 (32) and the transmission shaft 2 (33); one end of the transmission shaft 1 (32) is directly connected to the output shaft of the high-speed motor (1), and the other end of the transmission shaft 1 (32) is directly connected to the input shaft of the primary compressor head (21) via a coupling; one end of the transmission shaft 2 (33) is directly connected to the input shaft of the secondary compressor head (22) via a coupling.

5. The high-speed motor-driven dry oil-free screw compressor structure according to claim 2, characterized in that: The high-speed motor (1) adopts a double-output shaft design; the output shafts at both ends of the high-speed motor (1) are directly connected to the first-stage compressor head (21) and the second-stage compressor head (22) respectively by couplings.

6. The high-speed motor-driven dry oil-free screw compressor structure according to any one of claims 1 to 5, characterized in that: The rotation speed of the high-speed motor (1) is 7000-25000 rpm.

7. The high-speed motor-driven dry oil-free screw compressor structure according to any one of claims 1 to 5, characterized in that: A cooling liquid circulation channel is provided on the casing of the high-speed motor (1).

8. The high-speed motor-driven dry oil-free screw compressor structure according to any one of claims 1 to 5, characterized in that: It also includes a frequency converter (4) for controlling the high-speed motor (1).

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