Electromechanical common-cavity screw-type air compressor all-in-one machine integrated with variable-frequency driver

Abstract

The electromechanical co-cavity screw type air compression all-in-one machine integrated with the variable-frequency driver comprises a cylindrical shell, an air inlet and an air outlet are formed in the side wall of the cylindrical shell, and the variable-frequency driver, a radiator, a refrigeration fan and a permanent magnet synchronous motor are sequentially arranged in the cylindrical shell in the axis direction. The variable-frequency driver and the radiator are both fixed on the inner wall of the cylindrical shell, the permanent magnet synchronous motor comprises a permanent magnet synchronous motor stator and a double-screw rotor, the permanent magnet synchronous motor stator and the refrigeration fan share one double-screw rotor, the output end of the variable-frequency driver is electrically connected with the permanent magnet synchronous motor, and the output end of the variable-frequency driver is electrically connected with the radiator. The input end of the variable frequency driver is connected with the junction box, and the junction box is fixedly connected to the outer wall of the cylindrical shell; according to the device, the variable-frequency driver and the permanent magnet synchronous motor are arranged in the same mechanical cavity, so that the occupied space for equipment installation is reduced while the equipment size is reduced, and space utilization and layout optimization work of a user are facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of air compressors, and in particular relates to an electromechanical common cavity screw air compressor integrated with a variable frequency drive. Background Art

[0002] An air compressor is a key air source device that increases the pressure of compressed air to meet the needs of various industrial and commercial applications. An air compressor is usually composed of a compressor body, a motor, a cooling system, a control and protection device, etc. However, existing air compressors usually arrange the motor and the variable frequency drive 3 independently, and the motor and the variable frequency drive have independent mechanical cavities. For example, most existing twin-screw air compressors place the variable frequency drive module, the permanent magnet synchronous motor and the twin screw in different mechanical cavities, and each independent device is connected and used with cables and wires. The wiring is numerous and complicated, which easily leads to electromagnetic interference in space and affects the reliability and stability of the overall system. At the same time, such a design leads to a larger overall device size and a large space occupied when the device is installed. For users, it is not conducive to space utilization and layout optimization. Summary of the invention

[0003] The purpose of the present invention is to provide an electromechanical co-cavity screw air compressor with an integrated variable frequency drive, which solves the problem in the prior art that the motor and variable frequency drive of the existing air compressor are arranged independently, the equipment occupies a large space when installed, and is not conducive to space utilization and layout optimization.

[0004] The technical solution adopted by the present invention is an electromechanical common-cavity screw air compressor integrated with a variable frequency drive, comprising a cylindrical shell, an air inlet and an air outlet being opened on the side wall of the cylindrical shell, a variable frequency drive, a radiator, a cooling fan, and a permanent magnet synchronous motor being arranged in sequence along the axial direction inside the cylindrical shell, the permanent magnet synchronous motor comprising a permanent magnet synchronous motor stator and a twin-screw rotor, the permanent magnet synchronous motor stator and the cooling fan sharing a twin-screw rotor, the permanent magnet synchronous motor stator and the cooling fan being rotatably connected to the end of the cylindrical shell through the twin-screw rotor, the output end of the variable frequency drive is electrically connected to the permanent magnet synchronous motor, the input end of the variable frequency drive is connected to a junction box, and the junction box is fixedly connected to the outer wall of the cylindrical shell.

[0005] The present invention is also characterized in that

[0006] The variable frequency drive and the radiator are both fixed on the inner wall of the cylindrical shell, the variable frequency drive is in contact with the radiator, a gap is provided between the radiator and the cooling fan, the cooling fan and the stator of the permanent magnet synchronous motor are both located between the air inlet and the air outlet, and the opening position of the air inlet corresponds to the installation position of the radiator.

[0007] One end of the twin-screw rotor is coaxially fixed to the refrigeration fan, and the other end of the twin-screw rotor is rotatably connected to the end of the cylindrical shell through a bearing. The permanent magnet synchronous motor stator is coaxially arranged on the twin-screw rotor, and the permanent magnet synchronous motor stator is located between the refrigeration fan and the bearing.

[0008] There are a plurality of air inlets evenly distributed along the outer wall of the cylindrical shell, and there are a plurality of air outlets evenly distributed along the outer wall of the cylindrical shell.

[0009] Each air inlet and outlet is matched with a cavity ventilation grille.

[0010] The beneficial effects of the present invention are:

[0011] The electromechanical co-cavity screw air compressor integrated with a variable frequency drive of the present invention places the variable frequency drive and the permanent magnet synchronous motor in the same mechanical cavity, thereby achieving a high degree of physical mechanical integration, reducing the size of the equipment while effectively reducing the space occupied by the equipment installation, which is very beneficial for users to carry out space utilization and layout optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the external structure of the electromechanical common cavity screw type air compressor integrated with the variable frequency drive of the present invention;

[0013] Figure 2 It is a schematic diagram of the internal structure of the electromechanical common cavity screw type air compressor integrated with the variable frequency drive of the present invention;

[0014] Figure 3 The present invention is a working principle diagram of an electromechanical common cavity screw type air compressor integrated with a variable frequency drive.

[0015] In the figure, 1. cylindrical shell, 2. junction box, 3. frequency conversion drive, 4. cavity ventilation grille, 5. radiator, 6. cooling fan, 7. permanent magnet synchronous motor stator, 8. twin-screw rotor, 9. air inlet, 10. air outlet. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] The present invention is an integrated mechanical and electrical co-cavity screw air compressor with an integrated variable frequency drive, such as Figure 1As shown, it includes a cylindrical shell 1, and an air inlet 9 and an air outlet 10 are also opened on the side wall of the cylindrical shell 1. The interior of the cylindrical shell 1 is sequentially provided with a variable frequency drive 3, a radiator 5, a cooling fan 6, and a permanent magnet synchronous motor along the axial direction. The variable frequency drive 3 and the permanent magnet synchronous motor are placed in the same mechanical cavity, achieving a high degree of physical mechanical integration, reducing the size of the equipment and effectively reducing the space occupied by the equipment installation. In addition, the shape design of the cylindrical shell 1 is very conducive to the user's space utilization and layout optimization. Figure 2 As shown, the variable frequency drive 3 and the radiator 5 are both fixed on the inner wall of the cylindrical shell 1, the permanent magnet synchronous motor includes a permanent magnet synchronous motor stator 7 and a twin-screw rotor 8, the permanent magnet synchronous motor stator 7 and the cooling fan 6 share a twin-screw rotor 8, the permanent magnet synchronous motor stator 7 and the cooling fan 6 are rotatably connected to the end of the cylindrical shell 1 through the twin-screw rotor 8, the output end of the variable frequency drive 3 is electrically connected to the input end of the permanent magnet synchronous motor, the input end of the variable frequency drive 3 is connected to the junction box 2, the junction box 2 is fixed to the outer wall of the cylindrical shell 1, the variable frequency drive 3 is directly connected to the permanent magnet synchronous motor, which effectively reduces the connection lines between the systems, reduces the resistance and inductance caused by the length and number of cables, and effectively reduces the risk of electromagnetic interference, thereby improving the reliability and stability of the equipment.

[0018] The variable frequency drive 3 is in contact with the radiator 5, and a gap is provided between the radiator 5 and the cooling fan 6. The cooling fan 6 and the permanent magnet synchronous motor stator 7 are both located between the air inlet 9 and the air outlet 10. The opening position of the air inlet 9 corresponds to the installation position of the radiator 5. Through the rotation of the cooling fan 6, air is sucked into the cylindrical shell 1 from the air inlet 9, which has a cooling effect on the variable frequency drive 3 and the permanent magnet synchronous motor, and then discharged from the cylindrical shell 1 from the air outlet 10, which can effectively prevent the internal temperature of the cylindrical shell 1 from being too high and exceeding the safe operating temperature range of the variable frequency drive 3 and the permanent magnet synchronous motor. The radiator 5 is used to absorb the heat generated by the variable frequency drive 3 and the permanent magnet synchronous motor.

[0019] One end of the twin-screw rotor 8 is coaxially fixed to the cooling fan 6, and the other end of the twin-screw rotor 8 is rotatably connected to the end of the cylindrical shell 1 through a bearing. The permanent magnet synchronous motor stator 7 is coaxially arranged on the twin-screw rotor 8, and the permanent magnet synchronous motor stator 7 is located between the cooling fan 6 and the bearing. The permanent magnet synchronous motor stator 7 and the cooling fan 6 share a twin-screw rotor 8, so that the cooling fan 6 and the permanent magnet synchronous motor rotate synchronously. When the permanent magnet synchronous motor is working, the cooling fan 6 is also driven to rotate, providing cooling wind for the variable frequency drive 3 and the permanent magnet synchronous motor. The synchronous operation of the permanent magnet synchronous motor and the cooling fan 6 ensures the heat dissipation efficiency of the entire device, which helps the normal working temperature of the variable frequency drive 3 and the permanent magnet synchronous motor.

[0020] There are a plurality of air inlets 9 which are evenly distributed along the outer wall of the cylindrical shell 1 , and there are a plurality of air outlets ( 10 ) which are evenly distributed along the outer wall of the cylindrical shell 1 .

[0021] Each air inlet 9 and air outlet 10 is matched with a cavity ventilation grille 4, which plays a filtering role to prevent impurities from entering the interior of the cylindrical shell 1 and affecting the normal operation of the variable frequency drive 3, the cooling fan 6, and the permanent magnet synchronous motor.

[0022] The present invention integrates a variable frequency drive and an electromechanical common cavity screw air compressor, and its working principle is as follows: Figure 3 As shown, air is sucked in through the air inlet 9, flows through the radiator 5 to dissipate heat for the variable frequency drive 3, and then passes through the cooling fan 6 to dissipate heat for the permanent magnet synchronous motor stator 7 and the twin-screw rotor 8 again, and is finally discharged through the air outlet 10.

[0023] The present invention is an electromechanical common cavity screw air compressor integrated with a variable frequency drive, and the specific embodiments are as follows:

[0024] Example 1

[0025] An electromechanical common-cavity screw air compressor with integrated variable frequency drive comprises a cylindrical shell 1, an air inlet 9 and an air outlet 10 are also provided on the side wall of the cylindrical shell 1, a variable frequency drive 3, a radiator 5, a cooling fan 6, and a permanent magnet synchronous motor are sequentially arranged inside the cylindrical shell 1 along the axial direction, the variable frequency drive 3 and the radiator 5 are fixed on the inner wall of the cylindrical shell 1, the permanent magnet synchronous motor comprises a permanent magnet synchronous motor stator 7 and a twin-screw rotor 8, the permanent magnet synchronous motor stator 7 and the cooling fan 6 share a twin-screw rotor 8, the permanent magnet synchronous motor stator 7 and the cooling fan 6 are rotatably connected to the end of the cylindrical shell 1 through the twin-screw rotor 8, the output end of the variable frequency drive 3 is electrically connected to the permanent magnet synchronous motor, the input end of the variable frequency drive 3 is connected to the junction box 2, and the junction box 2 is fixed to the outer wall of the cylindrical shell 1.

[0026] Example 2

[0027] An electromechanical common-cavity screw air compressor with integrated variable frequency drive comprises a cylindrical shell 1, an air inlet 9 and an air outlet 10 are also provided on the side wall of the cylindrical shell 1, a variable frequency drive 3, a radiator 5, a cooling fan 6, and a permanent magnet synchronous motor are sequentially arranged inside the cylindrical shell 1 along the axial direction, the variable frequency drive 3 and the radiator 5 are fixed on the inner wall of the cylindrical shell 1, the permanent magnet synchronous motor comprises a permanent magnet synchronous motor stator 7 and a twin-screw rotor 8, the permanent magnet synchronous motor stator 7 and the cooling fan 6 share a twin-screw rotor 8, the permanent magnet synchronous motor stator 7 and the cooling fan 6 are rotatably connected to the end of the cylindrical shell 1 through the twin-screw rotor 8, the output end of the variable frequency drive 3 is electrically connected to the permanent magnet synchronous motor, the input end of the variable frequency drive 3 is connected to the junction box 2, and the junction box 2 is fixed to the outer wall of the cylindrical shell 1.

[0028] The cooling fan 6 and the permanent magnet synchronous motor stator 7 are both located between the air inlet 9 and the air outlet 10 , and the opening position of the air inlet 9 corresponds to the installation position of the radiator 5 .

[0029] One end of the twin-screw rotor 8 is coaxially fixed to the cooling fan 6, and the other end of the twin-screw rotor 8 is rotatably connected to the end of the cylindrical shell 1 through a bearing. The permanent magnet synchronous motor stator 7 is coaxially arranged on the twin-screw rotor 8, and the permanent magnet synchronous motor stator 7 is located between the cooling fan 6 and the bearing.

[0030] Example 3

[0031] An electromechanical common-cavity screw air compressor with integrated variable frequency drive comprises a cylindrical shell 1, an air inlet 9 and an air outlet 10 are also provided on the side wall of the cylindrical shell 1, a variable frequency drive 3, a radiator 5, a cooling fan 6, and a permanent magnet synchronous motor are sequentially arranged inside the cylindrical shell 1 along the axial direction, the variable frequency drive 3 and the radiator 5 are fixed on the inner wall of the cylindrical shell 1, the permanent magnet synchronous motor comprises a permanent magnet synchronous motor stator 7 and a twin-screw rotor 8, the permanent magnet synchronous motor stator 7 and the cooling fan 6 share a twin-screw rotor 8, the permanent magnet synchronous motor stator 7 and the cooling fan 6 are rotatably connected to the end of the cylindrical shell 1 through the twin-screw rotor 8, the output end of the variable frequency drive 3 is electrically connected to the permanent magnet synchronous motor, the input end of the variable frequency drive 3 is connected to the junction box 2, and the junction box 2 is fixed to the outer wall of the cylindrical shell 1.

[0032] The cooling fan 6 and the permanent magnet synchronous motor stator 7 are both located between the air inlet 9 and the air outlet 10 , and the opening position of the air inlet 9 corresponds to the installation position of the radiator 5 .

[0033] One end of the twin-screw rotor 8 is coaxially fixed to the cooling fan 6, and the other end of the twin-screw rotor 8 is rotatably connected to the end of the cylindrical shell 1 through a bearing. The permanent magnet synchronous motor stator 7 is coaxially arranged on the twin-screw rotor 8, and the permanent magnet synchronous motor stator 7 is located between the cooling fan 6 and the bearing.

[0034] There are a plurality of air inlets 9 evenly distributed along the outer wall of the cylindrical shell 1 , and there are a plurality of air outlets 10 evenly distributed along the outer wall of the cylindrical shell 1 .

[0035] Each air inlet 9 and air outlet 10 is matched with a cavity ventilation grille 4 .

Claims

1. An electromechanical co-cavity screw air compressor with integrated variable frequency drive, characterized in that: The invention comprises a cylindrical shell (1), the side wall of which is also provided with an air inlet (9) and an air outlet (10), the interior of the cylindrical shell (1) is provided with a variable frequency drive (3), a radiator (5), a cooling fan (6), and a permanent magnet synchronous motor in sequence along the axial direction, the permanent magnet synchronous motor comprising a permanent magnet synchronous motor stator (7) and a twin-screw rotor (8), the permanent magnet synchronous motor stator (7) and the cooling fan (6) sharing a twin-screw rotor (8), the permanent magnet synchronous motor stator (7) and the cooling fan (6) being rotatably connected to the end of the cylindrical shell (1) via the twin-screw rotor (8), the output end of the variable frequency drive (3) being electrically connected to the permanent magnet synchronous motor, the input end of the variable frequency drive (3) being connected to a junction box (2), and the junction box (2) being fixedly connected to the outer wall of the cylindrical shell (1).

2. The electromechanical common cavity screw air compressor integrated with a variable frequency drive according to claim 1, characterized in that: The variable frequency drive (3) and the radiator (5) are both fixed on the inner wall of the cylindrical shell (1); the variable frequency drive (3) is in contact with the radiator (5); a gap is provided between the radiator (5) and the cooling fan (6); the cooling fan (6) and the permanent magnet synchronous motor stator (7) are both located between the air inlet (9) and the air outlet (10); the opening position of the air inlet (9) corresponds to the installation position of the radiator (5).

3. The electromechanical common cavity screw air compressor integrated with a variable frequency drive according to claim 2, characterized in that: One end of the twin-screw rotor (8) is coaxially fixed to the cooling fan (6), and the other end of the twin-screw rotor (8) is rotatably connected to the end of the cylindrical shell (1) via a bearing. The permanent magnet synchronous motor stator (7) is coaxially arranged on the twin-screw rotor (8), and the permanent magnet synchronous motor stator (7) is located between the cooling fan (6) and the bearing.

4. The electromechanical common cavity screw air compressor integrated with a variable frequency drive according to claim 2, characterized in that: There are a plurality of air inlets (9) which are evenly distributed along the outer wall of the cylindrical shell (1), and there are a plurality of air outlets (10) which are evenly distributed along the outer wall of the cylindrical shell (1).

5. The electromechanical common cavity screw air compressor integrated with a variable frequency drive according to claim 4, characterized in that: Each of the air inlets (9) and air outlets (10) is matched with a cavity ventilation grille (4).

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