A double-sided asymmetric inner jet screw compressor rotor

Abstract

The utility model discloses a kind of double-side asymmetric inner spray liquid screw compressor rotors, including male rotor and female rotor, the male rotor and female rotor can work mutually cooperation;The male rotor includes male rotor shaft and the several male rotor tooth grooves of being arranged at the periphery of male rotor shaft, the female rotor includes female rotor shaft and the several female rotor tooth grooves of being arranged at the periphery of female rotor shaft;First heat exchange flow channel is equipped in the male rotor shaft, and the female rotor shaft is equipped with second heat exchange flow channel;First heat exchange flow channel is equipped with first valve, and first temperature sensor is equipped in first heat exchange flow channel;Second heat exchange flow channel is equipped with second valve;Second heat exchange flow channel is equipped with second temperature sensor;First valve, first temperature sensor, second valve and second temperature sensor can be respectively connected control circuit.The utility model can heat exchange to the rotor of screw compressor according to need, ensure that screw compressor rotor works stably.

Description

Technical Field

[0001] This utility model belongs to the field of compression equipment technology, and relates to a screw compressor, and more particularly to a double-sided asymmetric internal injection screw compressor rotor. Background Technology

[0002] Screw compressors include single-screw compressors and twin-screw compressors, with the twin-screw compressor comprising two rotors. As a widely used rotary compressor, the screw compressor belongs to the category of positive displacement compressors. Its operating characteristic is a wide flow range at relatively low pressures. Screw compressors play a crucial role in petrochemical production, commonly used in key processes such as natural gas gathering and transportation, fuel gas pressurization, refrigeration and compression (e.g., propane / butane), flare gas compression, and air compression. Furthermore, screw compressors are available in oil-free and oil-injected types, suitable for different discharge volumes and pressure conditions, respectively.

[0003] Screw compressors are not limited to the petrochemical industry; they play a vital role in various industrial processes requiring gas compression. Depending on the compressed medium, they can be categorized into oil-injected and oil-free types. Oil-injected screw compressors are typically used in medium to large-scale refrigeration systems, while oil-free screw compressors are often used in applications where media contamination is not a concern. Due to their compact structure, reliable operation, and high efficiency, screw compressors are widely used in air compression, refrigeration, and chemical processes. Their core performance lies in a pair of meshing male and female rotors.

[0004] Traditional screw rotor profiles are mostly symmetrical or unilaterally asymmetrical, resulting in problems such as a large leakage triangle and low area utilization coefficient, which limits further improvements in efficiency and performance. Furthermore, the compression process generates a large amount of heat, causing the gas temperature to rise. This not only reduces volumetric efficiency but may also lead to problems such as lubricant carbonization and rotor thermal deformation.

[0005] Existing technologies typically employ cooling by spraying liquid (oil or water) onto the casing. However, this method suffers from drawbacks such as cooling lag, uneven liquid distribution, and insufficient mixing with the working fluid, resulting in limited cooling effectiveness. While some technologies have proposed incorporating channels within the rotor, these are often not integrated with innovative rotor profile designs, and the placement of the spray points is often poor, failing to maximize both cooling efficiency and sealing / lubrication effects.

[0006] In view of this, there is an urgent need to design a new screw compressor in order to overcome at least some of the aforementioned defects of existing screw compressors. Utility Model Content

[0007] This invention provides a double-sided asymmetric internal injection screw compressor rotor, which can perform heat exchange (such as cooling) on ​​the screw compressor rotor as needed to ensure stable operation of the screw compressor rotor.

[0008] To solve the above-mentioned technical problems, according to one aspect of this utility model, the following technical solution is adopted:

[0009] A screw compressor rotor, the screw compressor rotor comprising a male rotor and a female rotor, the male rotor and the female rotor being able to cooperate with each other to work;

[0010] The male rotor includes a male rotor shaft and a plurality of male rotor tooth slots disposed around the male rotor shaft; the female rotor includes a female rotor shaft and a plurality of female rotor tooth slots disposed around the female rotor shaft.

[0011] The male rotor shaft is provided with a first heat exchange channel, which has a first channel inlet and a first channel outlet; the first channel inlet and the first channel outlet are located at the same end of the male rotor shaft, or the first channel inlet and the first channel outlet are located at different ends of the male rotor shaft.

[0012] The female rotor shaft is provided with a second heat exchange channel, the second heat exchange channel is provided with a second channel inlet and a second channel outlet; the second channel inlet and the second channel outlet are provided at the same end of the female rotor shaft, or the second channel inlet and the second channel outlet are provided at different ends of the female rotor shaft;

[0013] The first heat exchange channel is equipped with a first valve, and a first temperature sensor is installed inside the first heat exchange channel. The first temperature sensor is used to sense the temperature data of the first heat exchange channel.

[0014] The second heat exchange channel is equipped with a second valve; the second heat exchange channel is equipped with a second temperature sensor, which is used to sense the temperature data of the second heat exchange channel;

[0015] The first valve, the first temperature sensor, the second valve, and the second temperature sensor can be connected to a control circuit, and the control circuit, the first valve, the first temperature sensor, the second valve, and the second temperature sensor can be connected to a power module.

[0016] As one embodiment of this utility model, the male rotor and the female rotor have double asymmetric tooth profiles; that is, the tooth profile lines of the male rotor and the female rotor are asymmetric about their own tooth tip center lines (i.e., "single asymmetry"), and the profile lines of the male rotor and the female rotor are also different from each other and not mirror symmetric (i.e., "double asymmetry").

[0017] This design can significantly shorten the leakage line length during meshing and increase the inter-tooth area, thereby improving the volumetric efficiency and adiabatic efficiency of the compressor.

[0018] As one embodiment of this utility model, the male rotor and / or female rotor are provided with an integrated internal injection channel: at least one internal injection channel is provided axially at the axis of the male rotor and / or female rotor; the outlet of the internal injection channel is located on the working cavity side of the rotor tooth surface, and the position is located in any inter-tooth volume from the start of the compression process to the end of the compression process (i.e., before the exhaust begins).

[0019] As one embodiment of this utility model, the outlet of the internal injection channel is set at the stage when the compression reaches 30%-80% of the internal volume ratio. At this time, the gas temperature and pressure have risen significantly. Injecting coolant at this moment can most effectively absorb the heat of compression and suppress the temperature rise.

[0020] In one embodiment of this utility model, a third temperature sensor is provided at a set position of the male rotor tooth groove of the male rotor. The third temperature sensor is used to sense the temperature data of the working surface of the male rotor. The third temperature sensor is connected to the main control circuit and the power module respectively.

[0021] A fourth temperature sensor is provided at a set position on the female rotor tooth groove of the female rotor. The fourth temperature sensor is used to sense the temperature data of the working surface of the female rotor. The fourth temperature sensor is connected to the main control circuit and the power module respectively.

[0022] In one embodiment of this utility model, the main control circuit includes a processor and a first comparator. The non-inverting input terminal of the first comparator is connected to the output terminal of the first temperature sensor, and the inverting input terminal of the first comparator is connected to the output terminal of the first signal generator or the output terminal of the third temperature sensor. The output terminal of the first comparator is connected to the input terminal of the processor. The first signal generator is used to output a first threshold voltage.

[0023] In one embodiment of this utility model, the main control circuit further includes a second comparator, the non-inverting input terminal of the second comparator is connected to the output terminal of the second temperature sensor, the inverting input terminal of the second comparator is connected to the output terminal of the second signal generator or the output terminal of the fourth temperature sensor, and the output terminal of the second comparator is connected to the input terminal of the processor; the second signal generator is used to output a second threshold voltage.

[0024] In one embodiment of this utility model, bearings are provided at both ends of the male rotor shaft and bearings are provided at both ends of the female rotor shaft.

[0025] In one embodiment of this utility model, the first valve and the second valve are solenoid valves or electric valves.

[0026] In one embodiment of this utility model, the working surface of the male rotor tooth groove is provided with a first wear-resistant and corrosion-resistant coating, and the working surface of the female rotor tooth groove is provided with a second wear-resistant and corrosion-resistant coating.

[0027] In one embodiment of this utility model, the tooth ratio of the female rotor to the male rotor can be 6:5.

[0028] In one embodiment of this utility model, the gap between the male rotor and the female rotor is 0.05 to 0.09 mm.

[0029] The beneficial effects of this utility model are as follows: The double-sided asymmetric internal injection screw compressor rotor proposed in this utility model can perform heat exchange (such as cooling) on ​​the rotor of the screw compressor as needed, so as to ensure the stable operation of the screw compressor rotor.

[0030] Meanwhile, by combining the efficient double asymmetric tooth profile with the precise positioning of the internal spraying technology, this utility model achieves multiple technical effects such as shortening the leakage line, improving the area utilization coefficient, ensuring uniform and timely cooling, and enhancing sealing and lubrication.

[0031] Specifically, the beneficial effects of this utility model include:

[0032] High efficiency: The double asymmetric tooth profile reduces internal leakage paths and improves the area utilization coefficient, fundamentally enhancing the rotor's aerodynamic performance.

[0033] High-efficiency cooling: The internal injection channel directly introduces coolant into the cavity where the compression heat is most concentrated, achieving "targeted cooling". The cooling is timely, uniform and efficient, which can significantly reduce the exhaust temperature and improve volumetric efficiency.

[0034] Good sealing and lubrication: The liquid injected during the compression phase can effectively seal the gaps between rotors and between the rotor and the housing, while providing good lubrication for the meshing parts.

[0035] Compact structure: The liquid spraying function is integrated inside the rotor, eliminating the need for a complex multi-point spraying system on the casing and simplifying the overall structure.

[0036] Synergistic effect: The "double asymmetric profile" and "internal liquid injection" are not simply superimposed, but rather produce a synergistic effect. The high-efficiency profile reduces leakage, while the internal liquid injection further enhances this effect through liquid film sealing; at the same time, efficient cooling ensures that the rotor operates under better thermodynamic conditions, allowing the performance advantages of the profile to be fully utilized. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the rotor structure of a screw compressor in one embodiment of the present invention.

[0038] Figure 2 This is a schematic diagram of the composition of a screw compressor in one embodiment of the present invention.

[0039] Figure 3 This is a schematic diagram of the composition of the rotor control section of a screw compressor in one embodiment of the present invention. Detailed Implementation

[0040] The preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0041] To further understand this utility model, preferred embodiments of this utility model are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of this utility model, and not for limiting the scope of the claims of this utility model.

[0042] The description in this section pertains to only a few typical embodiments, and this utility model is not limited to the scope of the embodiments described. Substitution of identical or similar prior art methods with some technical features in the embodiments is also within the scope of this utility model's description and protection.

[0043] The term "connection" in the specification includes both direct and indirect connections, such as connections made through active devices, passive devices, or electrical conduction media; it may also include connections made by other active or passive devices that are known to those skilled in the art and can achieve the same or similar functional purpose, such as connections made through circuits or components such as switches or follower circuits.

[0044] This utility model discloses a rotor for a double-sided asymmetric internal injection screw compressor. Figure 1 This is a schematic diagram of the rotor structure of a screw compressor in one embodiment of the present invention. Figure 2 This is a schematic diagram of the composition of a screw compressor in one embodiment of the present invention. Figure 3 This is a schematic diagram of the rotor control section of a screw compressor in one embodiment of the present invention; please refer to [link / reference]. Figures 1 to 3 The screw compressor rotor includes a male rotor 1 and a female rotor 2, which can work together.

[0045] The male rotor 1 includes a male rotor shaft 11 and a plurality of male rotor tooth grooves 12 disposed around the male rotor shaft 11, and the female rotor 2 includes a female rotor shaft 21 and a plurality of female rotor tooth grooves 22 disposed around the female rotor shaft 21.

[0046] The male rotor shaft 11 is provided with a first heat exchange channel 13, which has a first channel inlet 14 and a first channel outlet 15. The first channel inlet 14 and the first channel outlet 15 are located at the same end of the male rotor shaft 11, or the first channel inlet 14 and the first channel outlet 15 are located at different ends of the male rotor shaft 11.

[0047] The female rotor shaft 21 is provided with a second heat exchange channel 23, the second heat exchange channel 23 is provided with a second channel inlet 24 and a second channel outlet 25; the second channel inlet 24 and the second channel outlet 25 are located at the same end of the female rotor shaft 21, or the second channel inlet 24 and the second channel outlet 25 are located at different ends of the female rotor shaft 21.

[0048] The first heat exchange channel 13 is equipped with a first valve 16 and a first temperature sensor 17, which is used to sense the temperature data of the first heat exchange channel 13. The second heat exchange channel 23 is equipped with a second valve 26 and a second temperature sensor 27, which is used to sense the temperature data of the second heat exchange channel 23. The first valve 16 and the second valve 27 are solenoid valves or electric valves.

[0049] The first valve 16, the first temperature sensor 17, the second valve 26, and the second temperature sensor 27 can be connected to the control circuit 3, and the control circuit 3, the first valve 16, the first temperature sensor 17, the second valve 26, and the second temperature sensor 27 can be connected to the power module 4. The control circuit 3 and the power module 4 can be set based on the male rotor 1 and the female rotor 2, or they can be not set on the male rotor 1 and the female rotor 2.

[0050] In one embodiment of this invention, the male rotor and female rotor have double asymmetric tooth profiles; that is, the tooth profiles of the male and female rotors are asymmetric about their own tooth tip centerlines (i.e., "single asymmetry"), and the profiles of the male rotor and the female rotor are also different from each other and not mirror images of each other (i.e., "double asymmetry"). This design can significantly shorten the leakage line length during meshing and increase the inter-tooth area, thereby improving the volumetric efficiency and adiabatic efficiency of the compressor.

[0051] The male rotor and / or female rotor are provided with integrated internal injection channels; at least one internal injection channel (which can be the first heat exchange channel, the second heat exchange channel mentioned above, or another channel) is provided axially along the axis of the male rotor and / or female rotor. The outlet of the internal injection channel (not shown in the figure) is located on the working cavity side of the rotor tooth surface, and its position is located in any inter-tooth volume from the start of the compression process to the end of the compression process (i.e., before the exhaust begins). In one embodiment, the outlet of the internal injection channel is located in the stage when the compression reaches 30%-80% of the internal volume ratio, at which time the gas temperature and pressure have risen significantly. Injecting coolant at this time can most effectively absorb the heat of compression and suppress the temperature rise.

[0052] In one embodiment of the present invention, a third temperature sensor 18 is provided at a set position of the male rotor tooth groove 12 of the male rotor 1. The third temperature sensor 18 is used to sense the temperature data of the working surface of the male rotor 1. The third temperature sensor 18 is connected to the main control circuit 3 and the power module 4 respectively.

[0053] The female rotor 2 has a fourth temperature sensor 28 at a set position on the female rotor tooth groove 22. The fourth temperature sensor 28 is used to sense the temperature data of the working surface of the female rotor 2. The fourth temperature sensor 28 is connected to the main control circuit 3 and the power module 4 respectively.

[0054] The main control circuit 3 includes a processor and a first comparator. The non-inverting input of the first comparator is connected to the output of the first temperature sensor 17, and the inverting input is connected to the output of a first signal generator or the output of the third temperature sensor 18. The output of the first comparator is connected to the input of the processor. The first signal generator is used to output a first threshold voltage. In one application scenario of this invention, when the temperature sensed by the first temperature sensor 17 is greater than a set threshold, the main control circuit can control the first valve to open.

[0055] The main control circuit further includes a second comparator. The non-inverting input of the second comparator is connected to the output of the second temperature sensor 27, and the inverting input is connected to the output of the second signal generator or the output of the fourth temperature sensor 28. The output of the second comparator is connected to the input of the processor. The second signal generator is used to output a second threshold voltage. In one application scenario of this invention, when the temperature sensed by the second temperature sensor 27 is greater than the set threshold, the main control circuit can control the second valve to open.

[0056] In one embodiment of the present invention, bearings 19 are provided at both ends of the male rotor shaft 11, and bearings 29 are provided at both ends of the female rotor shaft 21.

[0057] The working surface of the male rotor tooth groove 12 is provided with a first wear-resistant and anti-corrosion coating, and the working surface of the female rotor tooth groove 22 is provided with a second wear-resistant and anti-corrosion coating. Furthermore, the male rotor 1 and female rotor 2 have an asymmetrical structure on both sides, and the composition curves of the male rotor 1 and female rotor 2 include several circular arcs or circular arc envelopes. The tooth ratio of the female rotor to the male rotor can be 6:5, and the gap between the female rotor 2 and the male rotor 1 is 0.05–0.09 mm. A complete surface-to-surface seal is achieved between the female rotor and the male rotor, which helps to form a hydrodynamic lubrication film and reduces lateral leakage through the contact zone. Among products of the same power rating, it has the largest diameter and center distance.

[0058] In summary, the double-sided asymmetric internal injection screw compressor rotor proposed in this utility model can perform heat exchange (such as cooling) on ​​the screw compressor rotor as needed, ensuring stable operation of the screw compressor rotor.

[0059] Meanwhile, by combining the efficient double asymmetric tooth profile with the precise positioning of the internal spraying technology, this utility model achieves multiple technical effects such as shortening the leakage line, improving the area utilization coefficient, ensuring uniform and timely cooling, and enhancing sealing and lubrication.

[0060] Specifically, the beneficial effects of this utility model include:

[0061] High efficiency: The double asymmetric tooth profile reduces internal leakage paths and improves the area utilization coefficient, fundamentally enhancing the rotor's aerodynamic performance.

[0062] High-efficiency cooling: The internal injection channel directly introduces coolant into the cavity where the compression heat is most concentrated, achieving "targeted cooling". The cooling is timely, uniform and efficient, which can significantly reduce the exhaust temperature and improve volumetric efficiency.

[0063] Good sealing and lubrication: The liquid injected during the compression phase can effectively seal the gaps between rotors and between the rotor and the housing, while providing good lubrication for the meshing parts.

[0064] Compact structure: The liquid spraying function is integrated inside the rotor, eliminating the need for a complex multi-point spraying system on the casing and simplifying the overall structure.

[0065] Synergistic effect: The "double asymmetric profile" and "internal liquid injection" are not simply superimposed, but rather produce a synergistic effect. The high-efficiency profile reduces leakage, while the internal liquid injection further enhances this effect through liquid film sealing; at the same time, efficient cooling ensures that the rotor operates under better thermodynamic conditions, allowing the performance advantages of the profile to be fully utilized.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The description and application of this utility model herein are illustrative and not intended to limit the scope of the utility model to the above embodiments. The effects or advantages involved in the embodiments may not be manifested in the embodiments due to various factors, and the description of effects or advantages is not intended to limit the embodiments. Variations and modifications of the embodiments disclosed herein are possible, and various substitutions and equivalents of the components in the embodiments are well known to those skilled in the art. It should be clear to those skilled in the art that this utility model can be implemented in other forms, structures, arrangements, proportions, and with other components, materials, and parts without departing from the spirit or essential characteristics of this utility model. Other variations and modifications can be made to the embodiments disclosed herein without departing from the scope and spirit of this utility model.

Claims

1. A rotor for a double-sided asymmetric internal injection screw compressor, characterized in that, The screw compressor rotor includes a male rotor and a female rotor, which can mesh with each other and work together. The male rotor includes a male rotor shaft and a plurality of male rotor tooth slots disposed around the male rotor shaft; the female rotor includes a female rotor shaft and a plurality of female rotor tooth slots disposed around the female rotor shaft. The male rotor shaft is provided with a first heat exchange channel, which has a first channel inlet and a first channel outlet; the first channel inlet and the first channel outlet are located at the same end of the male rotor shaft, or the first channel inlet and the first channel outlet are located at different ends of the male rotor shaft. The female rotor shaft is provided with a second heat exchange channel, the second heat exchange channel is provided with a second channel inlet and a second channel outlet; the second channel inlet and the second channel outlet are provided at the same end of the female rotor shaft, or the second channel inlet and the second channel outlet are provided at different ends of the female rotor shaft; The first heat exchange channel is equipped with a first valve, and a first temperature sensor is installed inside the first heat exchange channel. The first temperature sensor is used to sense the temperature data of the first heat exchange channel. The second heat exchange channel is equipped with a second valve; the second heat exchange channel is equipped with a second temperature sensor, which is used to sense the temperature data of the second heat exchange channel; The first valve, the first temperature sensor, the second valve, and the second temperature sensor can be connected to a control circuit, and the control circuit, the first valve, the first temperature sensor, the second valve, and the second temperature sensor can be connected to a power module.

2. The rotor of the double-sided asymmetric internal injection screw compressor according to claim 1, characterized in that: The male rotor and female rotor have double asymmetric tooth profiles; that is, the tooth profile lines of the male rotor and female rotor are asymmetric about their own tooth tip center lines, and the profile lines of the male rotor and female rotor are also different from each other and not mirror symmetric.

3. The rotor of the double-sided asymmetric internal injection screw compressor according to claim 1, characterized in that: The male rotor and / or female rotor are provided with an integrated internal liquid injection channel: at least one internal liquid injection channel is provided axially at the axis of the male rotor and / or female rotor; the outlet of the internal liquid injection channel is located on the working cavity side of the rotor tooth surface, and the position is located in any inter-tooth volume from the start of the compression process to the end of the compression process.

4. The rotor of the double-sided asymmetric internal injection screw compressor according to claim 3, characterized in that: The outlet of the internal spray channel is located during the stage when the compression reaches 30%-80% of the internal volume ratio.

5. The rotor of the double-sided asymmetric internal injection screw compressor according to claim 1, characterized in that: A third temperature sensor is provided at a set position on the male rotor tooth groove of the male rotor. The third temperature sensor is used to sense the temperature data of the working surface of the male rotor. The third temperature sensor is connected to the control circuit and the power module respectively. A fourth temperature sensor is provided at a set position on the female rotor tooth groove of the female rotor. The fourth temperature sensor is used to sense the temperature data of the working surface of the female rotor. The fourth temperature sensor is connected to the control circuit and the power module respectively.

6. The rotor of the double-sided asymmetric internal injection screw compressor according to claim 5, characterized in that: The control circuit includes a processor and a first comparator. The non-inverting input of the first comparator is connected to the output of the first temperature sensor, and the inverting input of the first comparator is connected to the output of a first signal generator or the output of the third temperature sensor. The output of the first comparator is connected to the input of the processor. The first signal generator is used to output a first threshold voltage. The control circuit further includes a second comparator, the non-inverting input of which is connected to the output of the second temperature sensor, the inverting input of which is connected to the output of the second signal generator or the output of the fourth temperature sensor, and the output of which is connected to the input of the processor; the second signal generator is used to output a second threshold voltage.

7. The rotor of the double-sided asymmetric internal injection screw compressor according to claim 1, characterized in that: The male rotor shaft is provided with bearings at both ends, and the female rotor shaft is provided with bearings at both ends.

8. The rotor of the double-sided asymmetric internal injection screw compressor according to claim 1, characterized in that: The first valve and the second valve are solenoid valves or electric valves.

9. The rotor of the double-sided asymmetric internal injection screw compressor according to claim 1, characterized in that: The working surface of the male rotor tooth groove is provided with a first wear-resistant and corrosion-resistant coating, and the working surface of the female rotor tooth groove is provided with a second wear-resistant and corrosion-resistant coating.

10. The rotor of the double-sided asymmetric internal injection screw compressor according to claim 1, characterized in that: The tooth ratio of the female rotor to the male rotor can be 6:5; the gap between the male rotor and the female rotor is 0.05~0.09mm.

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