Energy-saving air compressor for air separation

Abstract

The utility model relates to the technical field of energy-saving air separation, in particular to an energy-saving air compressor for air separation, which comprises a motor, the motor is a double-output-shaft permanent magnet variable-frequency and variable-speed motor, and two output shafts of the motor are respectively connected with impellers of two compressors; the compressor is driven in the mode that the double-output-shaft permanent-magnet variable-frequency speed regulation is directly connected with the two impellers, an original step-up gear box can be omitted, various auxiliary devices matched with the gear box are further omitted, the occupied space of the devices is greatly saved, and the maintenance work of the devices is simplified; meanwhile, due to the fact that the transmission steps are simplified, the energy consumption loss in the transmission process can be reduced, the energy efficiency of the permanent magnet variable-frequency and variable-speed motor is higher, the overall energy consumption of the air separation equipment can be further reduced, and the air separation equipment is more energy-saving and environment-friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of energy-saving air separation, and specifically relates to an energy-saving air compressor for air separation. Background Technique

[0002] Air separation, abbreviated as AS, refers to the process of separating each component from air by applying the principle of cryogenic refrigeration; in the air separation process, air needs to be compressed first, and an air compressor, abbreviated as AC, is required for this step; currently, energy-saving improvements have been advocated for air separation devices, especially the energy-saving improvement of air compressors is a prominent focus; traditional air compressors include single-shaft air compressors and multi-shaft air compressors. A single-shaft compressor usually has only one main shaft, with a simple structure and relatively easy maintenance. Since there is only one shaft, the noise and vibration during operation are relatively small; however, the single-shaft design also limits its performance in applications that require high pressure and high flow rate, and the energy consumption is higher under the same requirements; a multi-shaft compressor has two or more shafts, which can provide greater pressure and greater flow rate to meet certain further usage requirements, but it requires additional mechanical structures for transmission, such as a gearbox for transmission and speed increase between multiple shafts, resulting in higher maintenance costs and production costs; at the same time, due to the operation of multiple shafts, greater vibration and noise will also be generated.

[0003] With the increasingly strict requirements for energy conservation and consumption reduction, the technology in the air separation industry has also made great progress. For example, the heat exchanger system has been updated to a high-efficiency finned heat exchanger, and the rectification system has been updated to a high-efficiency packing tower. Thanks to these improvements, the pressure requirement for the energy-saving air separation on the air compressor has been reduced to 0.45 MPa, and two-stage compression can meet the requirements, making the traditional three-stage compression unnecessary, thus giving the air compressor a greater space for energy-saving improvement. Content of the Utility Model

[0004] The purpose of the utility model is to provide an energy-saving air compressor for air separation driven by a permanent magnet variable frequency speed regulation motor.

[0005] Based on the above purpose, the utility model adopts the following technical solutions:

[0006] The energy-saving air compressor for air separation includes a motor. The output shaft of the compressor motor is connected with a compressor structure. The compressor structure includes a pair of compressors, and each of the pair of compressors includes a housing; an impeller is rotatably arranged in each compressor housing, and an air inlet and an air outlet pipe are respectively arranged on the housing; a pair of output shafts are arranged on the compressor motor, and the output shafts of the pair of compressors are respectively connected with the pair of impellers in a matching manner.

[0007] Preferably, the compressor motor is a permanent magnet variable frequency speed regulation motor.

[0008] Preferably, the compressor motor is a double-output shaft motor, and the two output shafts of the motor are respectively connected to the impellers of the two compressors in a matching manner.

[0009] Preferably, a pair of compressor centrifugal air compressors includes a first-stage compressor and a second-stage compressor connected in sequence, and the air outlet pipe of the first-stage compressor is communicated with the air inlet of the second-stage compressor.

[0010] Preferably, the compressor housing is a volute, the air inlet of the compressor is arranged at the center of one side surface of the volute, and the air outlet pipe is arranged at the end of the volute; an air inlet cylinder is arranged at the air inlet of the first-stage compressor.

[0011] The beneficial effects of the present utility model are as follows:

[0012] The present utility model directly uses a double-output shaft motor to drive the impellers of two compressors. By directly connecting the motor to the impellers, the speed increasing gearbox is omitted, and auxiliary equipment for maintaining the speed increasing gearbox such as oil injection is reduced, simplifying the equipment maintenance work and saving the equipment volume and occupied space; at the same time, since the impellers are directly connected by the motor without intermediate transmission through the speed increasing gearbox, the energy consumption loss of the overall transmission is also reduced by about 5%-25%, effectively reducing the energy consumption level of the equipment.

[0013] The motor used in the present utility model is a double-output shaft permanent magnet variable frequency speed regulation motor. Since the transmission mode of directly connecting the motor to the impellers is adopted, the speed of the impellers can be directly increased by increasing the speed of the motor, thus omitting the gearbox for speed increasing; at the same time, the permanent magnet variable frequency speed regulation motor itself has low energy consumption and is a first-level energy efficiency motor, which can further improve the energy-saving level of the air compressor; compared with a single-shaft air compressor, the double-shaft structure adopted by the present utility model can maintain lower energy consumption when outputting air of the same pressure, and has significant energy consumption advantages in the field of energy-saving air separation compared with various existing air compressors. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the front view of the motor of the present utility model;

[0015] Figure 2 is the front view of the overall structure of the present utility model;

[0016] Figure 3 is the top view of the overall structure of the present utility model;

[0017] Figure 4 is a schematic diagram of the structure of a multi-stage centrifugal air compressor in the prior art.

[0018] In the figure: double-output shaft motor 1; output shaft 2; first-stage compressor 3; second-stage compressor 4; single-output shaft motor 5; coupling 6; gearbox 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following is a further explanatory description of the present utility model in combination with specific embodiments. As Figure 2 and Figure 3 shown, this embodiment is a two-stage air compressor, including a motor and two compressor structures; as Figure 1 shown, the motor is a double-output shaft motor 1, and there is an output shaft on both its left and right sides, which can be respectively connected to the two compressors to drive the two compressors to work simultaneously.

[0020] The two compressors are respectively set as a first-stage compressor 3 and a second-stage compressor 4. Both the first-stage compressor 3 and the second-stage compressor 4 include a volute-shaped outer shell, and an impeller is arranged inside the outer shell; the impeller can rotate relative to the volute, and the two impellers are respectively connected in cooperation with the output shafts of the double-output shaft motor 1, so that the impellers can rotate around the axis under the drive of the output shafts to perform centrifugal compression work on air.

[0021] Openings are respectively arranged on both side surfaces of the volute of the compressor. One side is a through hole for cooperating with the output shaft, and the other side is an air inlet; an air outlet pipe is arranged at the outer edge end of the volute for discharging the air after centrifugal compression; an air inlet pipe is connected to the air inlet of the first-stage compressor 3, and uncompressed air can be inhaled through the air inlet pipe; the air outlet of the first-stage compressor 3 is connected to the air inlet of the second-stage compressor 4 through a pipeline (the pipeline is not shown in the figure), and the air after the first-stage compression can be introduced into the second-stage compressor 4 for second-stage compression to compress the air to a higher pressure; the air outlet pipe of the second-stage compressor 4 is connected to the next-stage equipment through a pipeline, and the air after the second-stage compression can be transmitted to the next-stage equipment for use; the pressure of the air after the second-stage compression can reach about 4 bar, which can meet the use scenario of energy-saving air separation.

[0022] The double-output shaft motor 1 used in this embodiment is a permanent magnet variable frequency speed regulation motor, which can adjust the frequency and speed under the control of the control unit, without the need to use a speed increasing gearbox 7 to increase the output speed of the single-shaft motor 5 as shown in Figure 4 the prior art, so that the gearbox 7 and various auxiliary devices can be omitted, greatly saving the equipment occupied space and significantly reducing the equipment maintenance pressure.

[0023] The air inlet pipe, the first-stage compressor 3, and the second-stage compressor 4 used in this embodiment are all prior art, and their connection structures with the output shaft 2 are also prior art; the permanent magnet variable frequency speed regulation motor and the double-output shaft motor 1 in this embodiment are also prior art, so no further explanatory description is made on the above-mentioned equipment and devices in this embodiment.

[0024] In actual use of this embodiment, a double-output shaft motor 1 drives two output shafts 2 to rotate simultaneously. Since the output shafts 2 are respectively connected in a matching manner with the impellers of a primary compressor 3 and a secondary compressor 4, two compressors can be driven to work simultaneously; the double-output shaft motor 1 is a permanent magnet variable frequency speed regulation motor, so the two output shafts 2 can directly reach the predetermined working speed by adjusting the motor speed, and then drive the impellers of the two compressors to reach the predetermined working speed; when the primary compressor 3 operates, uncompressed air is inhaled through an air inlet duct into the volute, and the air is driven to rotate centrifugally by the impeller, so that the air is compressed and discharged from the air outlet duct; the air outlet duct of the primary compressor 3 is communicated with the air inlet of the secondary compressor 4, and the air after primary compression enters the secondary compressor 4, is compressed again, is discharged from the air outlet duct of the secondary compressor 4, and is introduced into the next-stage equipment through a pipeline for further treatment.

[0025] As described above, it is only a further explanatory description of the present invention in combination with specific embodiments. All the descriptions made do not represent a limitation on the protection scope of the present invention. Any change or replacement scheme that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An energy-saving air compressor for air separation, comprising a motor, the output shaft of the motor is connected with a compressor structure, and it is characterized in that: The compressor structure includes a pair of compressors, and each of the pair of compressors includes a housing; an impeller is rotatably arranged in each housing, and an air inlet and an air outlet pipe are respectively arranged on each housing; a pair of output shafts are arranged on the motor, and the pair of output shafts are respectively in mating connection with a pair of impellers.

2. The energy-saving air compressor for air separation according to claim 1, wherein: The motor is a permanent magnet variable frequency speed regulating motor.

3. The energy-saving air compressor for air separation according to claim 2, wherein: The motor is a double-output shaft motor, and the two output shafts of the motor are respectively in mating connection with the impellers of the two compressors.

4. The energy-saving air compressor for air separation according to claim 3, characterized in that: The pair of compressors includes a first-stage compressor and a second-stage compressor which are connected in sequence, and the air outlet pipe of the first-stage compressor is communicated with the air inlet of the second-stage compressor.

5. The energy-saving air compressor for air separation according to claim 4, characterized in that: The housing is a volute, the air inlet is arranged at the center of one side surface of the volute, and the air outlet pipe is arranged at the end of the volute; an air inlet cylinder is arranged at the air inlet of the first-stage compressor.

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