Efficient liquid-cooled screw air compressor

Abstract

The invention discloses an efficient liquid-cooled screw air compressor which comprises an air compressor body, the air compressor body comprises an air cavity, and compressed air in the air cavity is compressed at a constant temperature through a liquid cooling system. According to the efficient liquid-cooled screw air compressor, the rotor can be cooled, the service life of the rotor is prolonged, the reliability of the rotor is improved, meanwhile, the rotor and an inner cavity of the air compressor are cooled at the same time, a larger heat exchange area is provided for air, the heat exchange efficiency is improved, and higher air pressure is provided under the same power consumption.

Description

Technical Field

[0001] The present invention relates to a high-efficiency liquid-cooled screw air compressor, belonging to the technical field of air compressors. Background Art

[0002] An air compressor is a device used to compress gases. The air compressor is similar in structure to a water pump. Most air compressors are reciprocating pistons, rotary vanes or rotary screws.

[0003] In order to improve work efficiency, existing air compressors increase the working cavity through a cascading method to achieve the improvement of the work efficiency of compressing gases. However, this method not only consumes a large amount of electric energy, but also causes the equipment to be too large in size and occupy too much space.

[0004] If, without changing the structure of the existing air compressor, the prior art generally uses the mixing of oil injection and air compression to reduce the temperature, so that the air compressor performs isothermal compression when compressing air, thereby improving work efficiency. However, the method of oil injection for cooling will cause oil pollution and is not applicable in cases where the environmental requirements are relatively high.

[0005] Therefore, how to achieve low energy consumption of the air compressor and improve work efficiency is a technical solution that those skilled in the art urgently need to solve. Summary of the Invention

[0006] Objective: In order to overcome the deficiencies in the prior art, the present invention provides a high-efficiency liquid-cooled screw air compressor.

[0007] Technical Solution: To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0008] A high-efficiency liquid-cooled screw air compressor, comprising: an air compressor main body.

[0009] Among them, the air compressor main body includes: an air cavity, and the compressed air in the air cavity is isothermally compressed through a liquid cooling system. It is used to solve the technical problem of unstable temperature of the working medium air in the air compressor.

[0010] Optionally, the liquid cooling system includes: a liquid inlet and a liquid outlet are provided on the housing; the rotating shaft in the air cavity is arranged as a hollow structure with openings at both ends. It is used to enable the circulating coolant to enter the housing through the liquid inlet and the liquid outlet on the housing, and enter the air cavity through the rotating shaft with openings at both ends to exchange heat with the working medium air, ensuring isothermal compression.

[0011] Optionally, the liquid cooling system further includes a guiding thread, and the guiding thread is arranged on the inner wall of the housing. It is used to accelerate the circulation of the coolant through the guiding thread on the inner wall of the housing and improve the heat exchange efficiency between the coolant and the working medium air.

[0012] Optionally, both ends of the rotating shaft are connected to the air cavity through mechanical seals to prevent the coolant from entering the air cavity.

[0013] Optionally, a cavity is provided inside the rotor on the rotating shaft, and the cavity is communicated with the hollow structure inside the rotating shaft. This is used to allow the coolant to enter the cavity inside the rotor, increase the contact area of heat exchange, and improve the heat exchange efficiency between the coolant and the working medium air.

[0014] Optionally, the air cavity includes: a primary air cavity and a secondary air cavity. Inside the housing, there are a primary liquid cavity and a secondary liquid cavity. The primary air cavity is arranged inside the primary liquid cavity, and the secondary air cavity is arranged inside the secondary liquid cavity. The liquid inlet is communicated with the primary liquid cavity, the liquid outlet is communicated with the secondary liquid cavity, and the primary liquid cavity is communicated with the secondary liquid cavity. The primary air cavity is provided with a first air inlet and a first air outlet, and the secondary air cavity is provided with a second air inlet and a second air outlet. This is used to increase the coolant capacity through the double - liquid - cavity structure, increase the power of the air compressor through the double - air - cavity structure, and have the highest comprehensive performance.

[0015] Optionally, the first rotating shaft in the primary air cavity is arranged as a hollow structure with openings at both ends, and the second rotating shaft in the secondary air cavity is arranged as a hollow structure with openings at both ends. This is used to enter the air cavity through the rotating shafts with hollow structures with openings at both ends to conduct heat exchange with the working medium air and ensure isothermal compression.

[0016] Optionally, cavities are provided inside the rotors on the first rotating shaft and the second rotating shaft, and the cavities are respectively communicated with the hollow structures inside the first rotating shaft and the second rotating shaft. This is used to allow the coolant to enter the cavities inside the rotors, increase the contact area of heat exchange, and improve the heat exchange efficiency between the coolant and the working medium air.

[0017] Optionally, it further includes: a cooling system for conducting heat exchange on the compressed air.

[0018] Optionally, it further includes: a power system for providing power to the main body of the air compressor.

[0019] Beneficial effects: An efficient liquid - cooled screw air compressor provided by the present invention can cool the rotor. Firstly, it improves the service life and reliability of the rotor. At the same time, the rotor and the inner cavity of the air compressor are cooled simultaneously, providing a larger heat exchange area for the gas, increasing the heat exchange efficiency, and providing a higher air pressure under the same power consumption.

[0020] Compared with the prior art, its advantages are as follows:

[0021] (1) The present invention increases the heat exchange area during air compression, can achieve dry cooling during the air compression process, ensures a certain degree of energy conservation and efficiency improvement, and does not cause environmental impact.

[0022] (2) The present invention can be carried out simultaneously with other cooling methods, such as combined with oil injection cooling. The combined use of multiple cooling methods can achieve greater cooling effects and better durability of the equipment.

[0023] (3) The present invention realizes true multi-stage compression and inter-stage cooling, and is closer to the conceptual Carnot cycle.

[0024] (4) The present invention reduces the temperature of the rotor, improves the service life of the rotor, and increases the reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the first embodiment of an efficient liquid-cooled screw air compressor according to the present invention.

[0026] Figure 2 It is a schematic structural diagram of the second embodiment of an efficient liquid-cooled screw air compressor according to the present invention.

[0027] Reference numerals: 1, rotor; 2, first-stage air cavity; 3, first-stage liquid cavity; 4, housing; 5, first rotating shaft; 6, liquid inlet; 7, first air inlet; 8, first air outlet; 9, heat exchange liquid inlet; 10, heat exchange liquid outlet; 11, second air inlet; 12, air-liquid heat exchanger; 13, second-stage air cavity; 14, second-stage liquid cavity; 15, second rotating shaft; 16, mechanical seal; 17, second air outlet; 18, liquid outlet; 19, driving wheel; 20, guiding thread; 21, motor; 22, first driving shaft; 23, second driving shaft; 24, driven wheel; 25, heat exchange tube; 26, heat dissipation fin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0030] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0031] The following further illustrates the present invention with specific embodiments.

[0032] Embodiment 1:

[0033] This embodiment introduces a high-efficiency liquid-cooled screw air compressor, including: an air compressor main body, a cooling system, and a power system.

[0034] Among them, the air compressor main body includes: an air cavity, and the compressed air in the air cavity is isothermally compressed through a liquid cooling system. This is used to solve the technical problem of unstable temperature of the working medium air in the air compressor.

[0035] The cooling system is used to perform heat exchange on the compressed air.

[0036] The power system is used to provide power to the air compressor main body.

[0037] Furthermore, in one embodiment, the liquid cooling system includes: a liquid inlet and a liquid outlet are provided on the housing; the rotating shaft in the air cavity is arranged as a hollow structure with openings at both ends. This is used to enable the circulating coolant to enter the housing through the liquid inlet and liquid outlet on the housing, and enter the air cavity through the rotating shaft with openings at both ends to perform heat exchange with the working medium air, ensuring isothermal compression.

[0038] Further, in one embodiment, the liquid cooling system further includes a flow guiding thread which is arranged on the inner wall of the housing and is used to accelerate the circulation of the coolant through the flow guiding thread on the inner wall of the housing, so as to improve the heat exchange efficiency between the coolant and the working medium air.

[0039] Further, in one embodiment, both ends of the rotating shaft are connected to the air chamber through mechanical seals, which is used to prevent the coolant from entering the air chamber.

[0040] Further, in one embodiment, a cavity is arranged inside the rotor on the rotating shaft, and the cavity is communicated with the hollow structure inside the rotating shaft, which is used to allow the coolant to enter the cavity inside the rotor, increase the contact area of heat exchange, and improve the heat exchange efficiency between the coolant and the working medium air.

[0041] Embodiment 2:

[0042] This embodiment introduces the first embodiment of the structure of a highly efficient liquid-cooled screw air compressor with a double air chamber, as Figure 1 shown, including: an air compressor main body, a cooling system and a power system.

[0043] Among them, the air chambers in the air compressor main body include: a first-stage air chamber 2, a second-stage air chamber 13, a first-stage liquid chamber 3 and a second-stage liquid chamber 14 are arranged inside the housing 4. The first-stage air chamber 2 is arranged inside the first-stage liquid chamber 3, and the second-stage air chamber 13 is arranged inside the second-stage liquid chamber 14. The liquid inlet 6 is communicated with the first-stage liquid chamber 3, the liquid outlet 18 is communicated with the second-stage liquid chamber 14, and the first-stage liquid chamber 3 is communicated with the second-stage liquid chamber 14. A first air inlet 7 and a first air outlet 8 are arranged on the first-stage air chamber 2, and a second air inlet 11 and a second air outlet 17 are arranged on the second-stage air chamber 13, which are used to increase the coolant capacity through the double liquid chamber structure and increase the power of the air compressor through the double air chamber structure.

[0044] Further, in one embodiment, the first rotating shaft 5 in the first-stage air chamber 2 is arranged as a hollow structure with both ends open, and the second rotating shaft 15 in the second-stage air chamber 13 is arranged as a hollow structure with both ends open, which is used to enter the air chamber through the rotating shaft with a hollow structure with both ends open to conduct heat exchange with the working medium air and ensure isothermal compression.

[0045] Further, in one embodiment, flow guiding threads 20 are arranged in the first-stage liquid chamber 3 and flow guiding threads 20 are arranged in the second-stage liquid chamber 14, which are used to accelerate the circulation of the coolant through the flow guiding threads on the inner wall of the housing and improve the heat exchange efficiency between the coolant and the working medium air.

[0046] Further, in one embodiment, both ends of the first rotating shaft 5 are connected to the first-stage air chamber 2 through mechanical seals 16, and both ends of the second rotating shaft 15 are connected to the second-stage air chamber 14 through mechanical seals 16, which are used to prevent the coolant from entering the air chamber.

[0047] Further, in one embodiment, a cavity is provided inside the rotor 1 on the first rotating shaft 5 and the second rotating shaft 15, and the cavity is respectively communicated with the hollow structures inside the first rotating shaft 5 and the second rotating shaft 15. This is used to allow the coolant to enter the cavity inside the rotor, increase the contact area of heat exchange, and improve the heat exchange efficiency between the coolant and the working medium air.

[0048] Further, in one embodiment, the power system includes a first drive shaft 22 and a second drive shaft 23. The first drive shaft 22 is engaged with the driven wheel 24 on the first rotating shaft 5 through the driving wheel 19. The second drive shaft 23 is engaged with the driven wheel 24 on the second rotating shaft 15 through the driving wheel 19. This is used to provide power for the air compressor.

[0049] Further, in one embodiment, the first drive shaft 22 and the second drive shaft 23 are connected to the motor through a transmission system.

[0050] Further, in one embodiment, the first drive shaft 22 and the second drive shaft 23 are respectively connected to the rotating shaft of the motor 21.

[0051] Further, in one embodiment, the first drive shaft 22 and the second drive shaft 23 are respectively connected to the first-stage liquid chamber 3 and the second-stage liquid chamber 14 through mechanical seals 16. This is used to prevent the coolant from flowing out of the housing.

[0052] Further, in one embodiment, the cooling system includes: a gas-liquid heat exchanger 12. A heat exchange tube 25 is provided inside the gas-liquid heat exchanger 12. The first air outlet 8 and the second air inlet 11 are respectively communicated with the gas-liquid heat exchanger. This is used to conduct heat exchange on the first-stage compressed working medium air. Among them, the heat exchange liquid inlet 9 at one end of the heat exchange tube 25 extends out of the gas-liquid heat exchanger 12, and the heat exchange liquid outlet 10 at the other end of the heat exchange tube 25 extends out of the gas-liquid heat exchanger 12.

[0053] Embodiment 3:

[0054] This embodiment introduces a second embodiment of the structure of a high-efficiency liquid-cooled screw air compressor with a double air chamber, as Figure 2 shown, including: an air compressor main body, a cooling system and a power system.

[0055] Among them, the air chambers in the air compressor main body include: a first-stage air chamber 2, a second-stage air chamber 13. A first-stage liquid chamber 3 and a second-stage liquid chamber 14 are arranged inside the housing 4. The first-stage air chamber 2 is arranged inside the first-stage liquid chamber 3, and the second-stage air chamber 13 is arranged inside the second-stage liquid chamber 14. The liquid inlet 6 is communicated with the first-stage liquid chamber 3, the liquid outlet 18 is communicated with the second-stage liquid chamber 14, and the first-stage liquid chamber 3 is communicated with the second-stage liquid chamber 14. A first air inlet 7 and a first air outlet 8 are arranged on the first-stage air chamber 2, and a second air inlet 11 and a second air outlet 17 are arranged on the second-stage air chamber 13. It is used to increase the coolant capacity through the double-liquid-chamber structure and increase the power of the air compressor through the double-air-chamber structure.

[0056] Further, in one embodiment, the first rotating shaft 5 in the first-stage air chamber 2 is arranged as a hollow structure with openings at both ends, and the second rotating shaft 15 in the second-stage air chamber 13 is arranged as a hollow structure with openings at both ends. It is used to enter the air chamber through the rotating shaft with a hollow structure with openings at both ends to conduct heat exchange with the working medium air and ensure isothermal compression.

[0057] Further, in one embodiment, a guiding thread 20 is arranged inside the first-stage liquid chamber 3, and a guiding thread 20 is arranged inside the second-stage liquid chamber 14. It is used to accelerate the circulation of the coolant through the guiding thread on the inner wall of the housing and improve the heat exchange efficiency between the coolant and the working medium air.

[0058] Further, in one embodiment, both ends of the first rotating shaft 5 are connected to the first-stage air chamber 2 through mechanical seals 16, and both ends of the second rotating shaft 15 are connected to the second-stage air chamber 14 through mechanical seals 16. It is used to prevent the coolant from entering the air chamber.

[0059] Further, in one embodiment, cavities are arranged inside the rotors 1 on the first rotating shaft 5 and the second rotating shaft 15, and the cavities are respectively communicated with the hollow structures inside the first rotating shaft 5 and the second rotating shaft 15. It is used to allow the coolant to enter the cavities inside the rotors, increase the contact area of heat exchange, and improve the heat exchange efficiency between the coolant and the working medium air.

[0060] Further, in one embodiment, the power system includes a first drive shaft 22 and a second drive shaft 23. The first drive shaft 22 is meshed with the driven wheel 24 on the first rotating shaft 5 through a driving wheel 19. The second drive shaft 23 is meshed with the driven wheel 24 on the second rotating shaft 15 through a driving wheel 19. It is used to provide power for the air compressor.

[0061] Further, in one embodiment, the first drive shaft 22 and the second drive shaft 23 are connected to the motor through a transmission system.

[0062] Further, in one embodiment, the first drive shaft 22 and the second drive shaft 23 are respectively connected to the rotating shaft of the motor 21.

[0063] Furthermore, in one embodiment, the first drive shaft 22 and the second drive shaft 23 are connected to the primary liquid chamber 3 and the secondary liquid chamber 14 respectively through a mechanical seal 16 to prevent the coolant from flowing out of the housing.

[0064] Furthermore, in one embodiment, the cooling system comprises: a heat dissipation fin 26, a heat exchange tube 25 is arranged inside the heat dissipation fin 26, the first air outlet 8 is connected to one end of the heat exchange tube 25, and the second air inlet 11 is connected to the other end of the heat exchange tube 25. It is used for heat exchange of the first stage compressed working medium air.

[0065] Embodiment 4:

[0066] This embodiment introduces the working process of a dual-cavity structure of a high-efficiency liquid-cooled screw air compressor of embodiment 2, in which a motor drives a driving wheel on a driving shaft to rotate, and the driving wheel drives a hollow primary rotating shaft, a secondary rotating shaft and a rotor to rotate respectively through a driven wheel. The rotation of the rotor draws in gas in a target area from the air inlet, and after being compressed in the primary air cavity, enters the gas-liquid heat exchanger through the first air outlet, and after sufficient heat dissipation, enters the secondary air cavity through the second air inlet, and is discharged from the second air outlet after secondary compression. The continuous rotation of the rotor can provide high-pressure air for direct use or storage in a high-pressure gas tank.

[0067] On the other hand, since the driving wheel and the driven wheel are built in the coolant of the liquid cavity, the coolant can be cooling oil, which can play a role of lubrication and cooling at the same time. If a better cooling effect is desired, a coolant with a low viscosity coefficient can be selected to reduce the loss of transmission energy. The coolant enters from the liquid inlet, and a part of it flows spirally around the inner wall of the liquid cavity from the guide thread, and the other part is sucked into the shaft by the rotation of the hollow shaft, runs through the entire shaft, and converges in the liquid cavity area at the end of the shaft, enters the secondary liquid cavity from the end, and flows out from the liquid outlet after being divided again. The mechanical seal plays a role in isolating the air cavity and the liquid cavity, as well as the liquid cavity 3 and the fluid area outside the shell.

[0068] Furthermore, in order to achieve a better cooling effect, a small amount of cooling oil is sprayed into the air inlet while the air in the target area is extracted, and the mixed gas after the oil and gas is compressed and discharged. The advantage is that while the compressed gas exchanges heat with the coolant wall, the evaporation heat absorption of the cooling oil also takes away part of the gas heat, so the temperature rise is lower.

[0069] Embodiment 5:

[0070] This embodiment introduces the working process of a dual-cavity structure of a high-efficiency liquid-cooled screw air compressor of embodiment 3, wherein the motor drives the driving wheel on the driving shaft to rotate, and the driving wheel drives the hollow primary rotating shaft, secondary rotating shaft and rotor to rotate respectively through the driven wheel. The rotation of the rotor sucks the gas in the target area from the air inlet, and enters the heat exchange tube through the first air outlet after being compressed in the primary air cavity. The compressed gas in the heat exchange tube enters the secondary air cavity through the second air inlet after being fully dissipated by the heat dissipation fins, and is discharged from the second air outlet after being compressed in the secondary stage. The continuous rotation of the rotor can provide high-pressure air for direct use or storage in a high-pressure gas tank.

[0071] On the other hand, since the driving wheel and the driven wheel are built in the coolant of the liquid cavity, the coolant can be cooling oil, which can play a role of lubrication and cooling at the same time. If a better cooling effect is desired, a coolant with a low viscosity coefficient can be selected to reduce the loss of transmission energy. The coolant enters from the liquid inlet, and a part of it flows spirally around the inner wall of the liquid cavity from the guide thread, and the other part is sucked into the shaft by the rotation of the hollow shaft, runs through the entire shaft, and converges in the liquid cavity area at the end of the shaft, enters the secondary liquid cavity from the end, and flows out from the liquid outlet after being divided again. The mechanical seal plays a role in isolating the air cavity and the liquid cavity, as well as the liquid cavity 3 and the fluid area outside the shell.

[0072] Furthermore, in order to achieve a better cooling effect, a small amount of cooling oil is sprayed into the air inlet while extracting air from the target area. The mixed gas after oil and gas is compressed and discharged. The advantage is that while the compressed gas exchanges heat with the coolant wall, the vaporization heat absorption of the cooling oil also takes away part of the gas heat, so that the temperature rise is lower.

[0073] Embodiment 6:

[0074] This embodiment introduces the working principle of a high-efficiency liquid-cooled screw air compressor with a double air chamber structure. The device embodiment described above is only schematic, wherein the hollow shaft can be just hollow, or the entire rotor can be hollow, and the design of the fluid flow channel can be spiral, reciprocating or other forms. Some or all of the modules can be selected according to actual needs to achieve the purpose of this embodiment. Ordinary technicians in this field can understand and implement it without creative labor.

[0075] After the coolant enters the air compressor, it is divided into two paths. One path enters the near-wall surface of the housing, and the other path enters the hollow rotating shaft. The hollow structure of the hollow rotating shaft is connected to the rotor cavity. In this way, the coolant can almost completely cover the air inside the vacuum pump, achieving an approximately isothermal compression effect and saving energy consumption. If multi-stage compression is involved, inter-stage cooling technology can be added. The coolant after heat exchange in the first-stage compression is led out of the cavity, cooled and then injected into the second-stage compression cavity. Fresh coolant can also be injected into the two compression cavities simultaneously. The coolant after heat exchange is collected elsewhere for heat dissipation at the same time, and then the inter-stage cooling part is not needed, reducing the volume of the equipment.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

[0077] The above is only the preferred embodiment of the present invention, and it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A high-efficiency liquid-cooled screw air compressor, comprising: The air compressor body is characterized in that: the air compressor body includes: an air cavity, and the compressed air in the air cavity is compressed at a constant temperature through a liquid cooling system.

2. A high-efficiency liquid-cooled screw air compressor according to claim 1, characterized in that: The liquid cooling system comprises: a shell is provided with a liquid inlet and a liquid outlet; and a rotating shaft in the air cavity is provided as a hollow structure with openings at both ends.

3. The high-efficiency liquid-cooled screw air compressor according to claim 1, characterized in that: The liquid cooling system further comprises a flow-guiding thread, and the flow-guiding thread is arranged on the inner wall of the shell.

4. The high-efficiency liquid-cooled screw air compressor according to claim 1, characterized in that: The two ends of the rotating shaft are connected with the air cavity through mechanical seals.

5. A high-efficiency liquid-cooled screw air compressor according to claim 4, characterized in that: A cavity is arranged in the rotor on the rotating shaft, and the cavity is communicated with the hollow structure in the rotating shaft.

6. The high-efficiency liquid-cooled screw air compressor according to claim 1, characterized in that: The air cavity includes: a primary air cavity and a secondary air cavity. A primary liquid cavity and a secondary liquid cavity are arranged in the shell. A primary air cavity is arranged in the primary liquid cavity, and a secondary air cavity is arranged in the secondary liquid cavity. The liquid inlet is communicated with the primary liquid cavity, the liquid outlet is communicated with the secondary liquid cavity, and the primary liquid cavity is communicated with the secondary liquid cavity. The primary air cavity is provided with a first air inlet and a first air outlet, and the secondary air cavity is provided with a second air inlet and a second air outlet.

7. A high-efficiency liquid-cooled screw air compressor according to claim 6, characterized in that: The first rotating shaft in the primary air cavity is configured as a hollow structure with openings at both ends, and the second rotating shaft in the secondary air cavity is configured as a hollow structure with openings at both ends.

8. The high-efficiency liquid-cooled screw air compressor according to claim 7, characterized in that: The rotors on the first rotating shaft and the second rotating shaft are provided with cavities, and the cavities are respectively communicated with the hollow structures in the first rotating shaft and the second rotating shaft.

9. A high-efficiency liquid-cooled screw air compressor according to any one of claims 1 to 8, characterized in that: Also includes: A cooling system is used to perform heat exchange on compressed air.

10. A high-efficiency liquid-cooled screw air compressor according to any one of claims 1 to 8, characterized in that: Also included: Also included: A power system, the power system is used to provide power to the air compressor body.

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