A method for adjusting the torque of the female rotor of a screw compressor

Abstract

The present invention relates to the technical field of compressors, and specifically to a method for adjusting the torque of the female rotor of a screw compressor, which can conveniently and quickly adjust the torque of the female rotor, reduce costs. One end of the female rotor is connected to one end of a torque meter, and the other end of the torque meter is connected to a torque adjusting device. When the female rotor is designed to have a driving torque, the torque adjusting device is a load; when the female rotor is designed to have a resistance torque, the torque adjusting device is a power input device.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly to a method for adjusting the torque of the female rotor of a screw compressor. Background Art

[0002] The core component "rotor" of a screw compressor is composed of a male rotor and a female rotor that satisfy the meshing law. Generally, the end face tooth profiles of the male rotor and the female rotor are called rotor profiles, and the rotor profiles play a key role in the performance of the compressor. When designing the rotor profiles and the compressor structure, it is necessary to calculate in detail the torques and the resultant torque of the male and female rotors. These torques usually include the driving torque of the driving machine, the frictional torque, the gas torque, or the gear torque, etc. By adjusting the rotor profiles, the magnitude of the gas torque can be significantly changed, thereby changing the magnitude or direction of the rotor resultant torque. Among them, the resultant torque of the female rotor is the most worthy of attention. Generally, it is considered that it needs to maintain a certain positive or negative value, avoiding being zero or fluctuating around zero, which may lead to poor rotor meshing, instability, and even obvious noise. At the same time, it is considered that an excessive resultant torque of the female screw rotor will cause an increase in the contact force between the male and female rotors, accelerating the wear of the rotor profiles. Long-term operation will exacerbate the leakage of gas in the tooth space, affecting the performance of the compressor.

[0003] Once the rotor tooth profile is processed, it is difficult to change the magnitude of its gas torque under a given operating condition. Therefore, in order to verify whether the profile torque design is reasonable, the common method is to process rotors with different end face tooth profiles and repeatedly test and verify, but this verification method has the disadvantages of low efficiency, high cost, and long cycle. At present, there is a lack of a quick method for adjusting the torque of the female rotor of a screw compressor. Summary of the Invention

[0004] In order to solve the problems of difficult torque adjustment, low efficiency, and high cost of the existing female rotor of the compressor, the present invention provides a method for adjusting the torque of the female rotor of a screw compressor, which can conveniently and quickly adjust the torque of the female rotor and reduce the cost.

[0005] Its technical solution is as follows: A method for adjusting the torque of the female rotor of a screw compressor, characterized in that one end of the female rotor is connected to one end of a torque meter, and the other end of the torque meter is connected to a torque adjustment device. When the female rotor is designed as a driving torque, the torque adjustment device is a load. When the female rotor is designed as a resistance torque, the torque adjustment device is a power input device.

[0006] It is further characterized in that the load adopts an oil pump or a generator;

[0007] The power input device adopts a screw expander or a scroll expander;

[0008] The intermediate rotor is connected to the torque meter and the torque meter is connected to the torque adjustment device through an intermediate connection structure.

[0009] After adopting the present invention, since the resultant torque direction on the intermediate rotor promotes the intermediate rotor to rotate in the normal working rotation direction, it is the driving torque. On the contrary, when the resultant torque direction hinders the intermediate rotor from rotating in the normal working rotation direction, the resultant torque is the resistance torque. Therefore, by adding a torque meter and a suitable torque adjustment device, the torque of the intermediate rotor of the screw compressor can be adjusted flexibly and accurately, and torque testing can be carried out, achieving the purpose of optimizing the profile design and the performance of the compressor. Brief Description of the Drawings

[0010] Figure 1 Schematic diagram of Embodiment 1 of the present invention;

[0011] Figure 2 Schematic diagram of Embodiment 2 of the present invention;

[0012] Figure 3 Schematic diagram of Embodiment 3 of the present invention. Detailed Description of the Invention

[0013] A method for adjusting the torque of the intermediate rotor of a screw compressor. The screw compressor includes a male rotor 1 and an intermediate rotor 2. One end of the intermediate rotor 2 is connected to one end of a torque meter 3, and the other end of the torque meter 3 is connected to a torque adjustment device. For a common screw compressor, when the resultant torque direction on the intermediate rotor promotes the intermediate rotor to rotate in the normal working rotation direction, it is the driving torque. On the contrary, when the resultant torque direction hinders the intermediate rotor from rotating in the normal working rotation direction, the resultant torque is the resistance torque. Therefore, when the intermediate rotor is designed as the driving torque, the torque adjustment device is the load, and when the intermediate rotor is designed as the resistance torque, the torque adjustment device is the power input device. The intermediate rotor 2 is connected to the torque meter 3 and the torque meter 3 is connected to the torque adjustment device through an intermediate connection structure 4. The intermediate connection structure 4 can be a coupling or other structures.

[0014] Embodiment 1: As shown in Figure 1 When the intermediate rotor is designed as the driving torque, the torque adjustment device adopts an oil pump or a generator, that is, Figure 1 the component marked as 5 in the figure, and by reducing the magnitude of its driving torque, the influence of the torque change of the intermediate rotor 2 of the screw compressor on the performance of the screw compressor rotor is verified.

[0015] Embodiment 2: As shown in Figure 2As shown, when the female rotor is designed to have a resistance moment, the torque adjustment device uses a screw expander 6. The male rotor 61 of the expander built therein is connected to the female rotor 2 of the screw compressor through an intermediate connection structure 4. With the screw expander 6 as the power input, the male rotor 61 of the screw expander drives the female rotor of the screw compressor to do work, changing the magnitude and even the direction of the torque on the female rotor 2 of the screw compressor, and can also achieve the purpose of verifying the influence of the torque change of the female rotor 2 of the screw compressor on the rotor performance of the screw compressor.

[0016] Embodiment 3: See Figure 3 As shown, when the female rotor is designed to have a resistance moment, the torque adjustment device uses a scroll expander 7. The generator shaft built therein is connected to the female rotor 2 of the screw compressor through an intermediate connection structure 4. With the scroll expander 7 as the power input, the motor shaft of the scroll expander drives the female rotor 2 of the screw compressor to do work, changing the magnitude and even the direction of the torque on the female rotor 2 of the screw compressor, and achieving the same verification purpose.

[0017] The above-described method of the external torque adjustment device can overcome the disadvantages of the traditional method of repeatedly testing and verifying by machining rotors with different end face tooth profiles, such as low verification efficiency, high cost, and long cycle, and has the advantages of being fast and flexible.

[0018] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for adjusting the torque of the female rotor of a screw compressor, characterized in that, One end of the male rotor is connected to one end of the torque meter, and the other end of the torque meter is connected to the torque adjusting device. When the male rotor is designed as the driving torque, the torque adjusting device is the load; when the male rotor is designed as the resistance torque, the torque adjusting device is the power input device. The load uses an oil pump or a generator, and the power input device uses a screw expander or a scroll expander.

2. A method for adjusting the torque of the female rotor of a screw compressor according to claim 1, characterized in that, Both between the male rotor and the torque meter and between the torque meter and the torque adjusting device are connected through an intermediate connection structure.

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