A dry screw compressor with gear speed increasing and working method thereof

Abstract

The present application relates to a kind of dry screw compressor of gear speed-up, gas compression area is equipped with compression component on it, gear bearing, bearing lubrication area is equipped with shaft seal component on it, gear bearing lubrication area is also equipped with gear component;Gear component includes the speed-up gear set driven by low-speed motor, speed-up gear set realizes high speed transmission by synchronous gear set driven yin, male rotor.High speed transmission is realized by low-speed motor matching speed-up gear, and synchronous gear drives rotor synchronous operation, avoid mutual friction and collision between rotor, overall layout arrangement is reasonable, compact structure, transmission operation is stable, power transmission efficiency is high, cost is reduced.Using equipped shaft seal component combines embedded labyrinth seal structure, with air barrier, leakage collection and leakage backflow structure, sealing performance is stable and reliable, prevent lubricating oil from leaking into the interior of compression area, while avoiding compressed gas to leak into lubrication area, ensure dry screw compressor oil-free compression operating condition stable operation, improve the reliability of equipment operation.

Description

Technical Field

[0001] This invention relates to a gear-speed-increasing dry screw compressor and its working method, and relates to the field of screw compressor technology. Background Technology

[0002] Dry screw compressors utilize a pair of meshing screws rotating at high speed to draw the working fluid into the space between the screw teeth. The periodic change in the volume between the teeth completes the fluid's intake, compression, and discharge. No lubricating oil is introduced into the compression process, achieving oil-free, clean, efficient, and reliable compression. Dry screw compressors align with the industrial trends of energy conservation, emission reduction, and efficiency improvement, and hold significant strategic importance for industrial upgrading and domestic substitution.

[0003] Current dry screw compressors suffer from significant technological shortcomings. Responding to high-speed operation demands with existing drive methods will result in high motor costs, hindering large-scale adoption and increasing both manufacturing and operating costs. Dry screw compressors require an absolutely clean compression system; existing sealing structures are prone to failure, leading to lubricant leakage, undermining their oil-free advantage, and affecting operational stability.

[0004] Based on this, in order to solve the above technical problems, this case proposes a dry screw compressor with gear speed increase and its working method. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a gear-speed dry screw compressor and its working method.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a dry screw compressor with gear speed increase, comprising a compressor housing, wherein a gas compression zone is provided inside the compressor housing, wherein the intake end of the gas compression zone is a gear bearing lubrication zone, and the exhaust end is a bearing lubrication zone; A compression assembly is provided on the gas compression zone, and a shaft seal assembly is provided on both the gear bearing lubrication zone and the bearing lubrication zone. A gear assembly is also provided on the gear bearing lubrication zone next to the shaft seal assembly. The compression assembly includes a female rotor and a male rotor; The shaft seal assembly is set at the connection position of the male and female rotors and their corresponding bearings, and includes a gas-liquid leakage return ring group, an air injection barrier ring group, and an oil leakage return ring group along the direction from the gas compression zone to the gear bearing and bearing lubrication zone, in order to isolate the mutual leakage of the lubricating oil in the gear bearing and bearing lubrication zone and the working fluid in the gas compression zone. The gear assembly includes a speed-increasing gear set driven by a low-speed motor, which drives the male and female rotors via a synchronous gear set to achieve high-speed transmission.

[0007] Preferably, the compressor housing is assembled into a sealed compression chamber by sequentially connecting and fixing the gear end cover, gear housing, rotor housing, exhaust housing, and exhaust end cover along the axial direction; an air inlet is provided on the upper part of the rotor housing, and an exhaust port is provided on the lower side of the exhaust housing; the compressor housing is also provided with a water injection hole, an air blowing hole, a venting hole, an exhaust port, and a return air hole; the exhaust port is connected to the return air hole through an air collecting pipe.

[0008] Preferably, the speed-increasing gear set includes a driving gear and a driven gear that mesh with each other. A drive shaft is coaxially fixedly connected to the driving gear, and the driven gear is coaxially fixedly connected to the male rotor. The difference in the number of teeth between the large-sized driving gear and the small-sized driven gear forms a fixed transmission ratio. Speed-increasing transmission is achieved by the driving gear driving the driven gear. The synchronizing gear set includes an M-synchronizing gear and an F-synchronizing gear that mesh with each other. The M-synchronizing gear is coaxially fixedly connected to the male rotor, and the F-synchronizing gear is coaxially fixedly connected to the female rotor. There is no direct contact transmission between the male rotor and the female rotor. Synchronous operation of the female and male rotors is achieved through the meshing transmission of the M-synchronizing gear and the F-synchronizing gear.

[0009] Preferably, the gas-liquid leakage return ring assembly includes a wave spring, a graphite ring, a fixed ring, a balance ring, and a condensate discharge ring along the direction from the gas compression zone to the gear bearing and the bearing lubrication zone. The gas injection barrier ring assembly includes a gas injection ring. The oil leakage return ring assembly includes a labyrinth seal ring. The fixed ring, balance ring, and gas injection ring are also provided with wave springs and graphite rings.

[0010] Preferably, the inner ring of the graphite ring is provided with a labyrinth sealing structure. The labyrinth groove of the labyrinth sealing structure forms a tortuous throttling channel, which gradually reduces the pressure of the lubricating oil and working gas moving along the axial surface and dissipates the energy through eddy currents, forming a highly efficient leakage barrier. The graphite ring and the male and female rotors are both clearance fits, and non-contact sealing is achieved by relying on gas film or liquid end, which is used to seal the trace leakage after the labyrinth sealing structure throttling, forming a secondary sealing protection.

[0011] Preferably, the outer circumference of the fixed ring has several notches, which connect to the exhaust port; the fixed ring and the male and female rotors are in clearance fit, and the graphite ring is installed in its inner cavity. The inner ring of the graphite ring is provided with a labyrinth sealing structure to prevent gas from the gas compression zone from leaking to the lubrication zone.

[0012] Preferably, the balance ring is an annular component that forms a micro-gap sealing pair with the male and female rotors, achieving sealing through the damping effect of gas leaking through the gap; the inner cavity of the balance ring is equipped with a graphite ring, and the inner ring of the graphite ring is provided with a labyrinth sealing structure to prevent gas from the gas compression zone from leaking to the lubrication zone; the balance ring is used to constrain the pressure fluctuations between the gas compression zone and the air blowing hole, thereby achieving load balance.

[0013] Preferably, the condensate draining ring is an annular component that forms a clearance fit with the male and female rotors. Multiple condensate draining holes are evenly distributed around the outer circumference of the condensate draining ring, and these holes are connected to the vent hole, allowing gas, water droplets, and oil to be discharged from the system through the condensate draining holes.

[0014] Preferably, the gas injection ring is an annular component that forms a clearance fit with the male and female rotors. The outer circumference of the gas injection ring is provided with several gas injection holes for uniformly introducing gas. Graphite rings are respectively installed in the axial front and rear cavities of the gas injection ring, and the outer ring is also machined with an annular groove for setting a sealing ring. The graphite ring and the sealing ring form a cooperative sealing structure. The inner ring of the labyrinth sealing ring is provided with a labyrinth sealing structure, which uses throttling and eddy current effects to prevent oil leakage to the gas compression zone. Multiple oil return holes are evenly distributed on the outer circumference of the ring, and the oil flows back to the lubrication zone through the oil return holes.

[0015] A method for operating a gear-speed-increasing dry screw compressor, comprising the following steps: The working fluid enters the rotor housing through the inlet, is compressed by the meshing of the male and female rotors, and is discharged through the exhaust port at the bottom of the exhaust housing. No oil is involved in the entire compression process. During this period: After the gas leaking from the gas compression zone passes through the graphite ring, fixed ring, balance ring, and condensate drain ring for throttling and sealing, a small amount of gas still leaks. Gas is injected into the injection ring through the blast hole to form a gas seal barrier, preventing the gas from continuing to flow into the lubrication zone and causing the small amount of leaked gas to flow back to the gas compression zone. The small amount of leaked gas and oil pass through the condensate drain ring and are led out to the vent hole through the condensate drain hole on the outer ring of the condensate drain ring. The remaining leaked gas passes through the fixed ring and is led out to the exhaust hole through the notch on the outer ring of the fixed ring. The exhaust hole flows back to the return air hole through the gas collection pipe for recycling. Even after the labyrinth seal seals the leaking oil in the gear bearing and bearing lubrication area, there is still leaking oil. Gas is injected into the air injection ring through the air blowing hole to form an air seal barrier, preventing the oil from continuing to flow into the gas compression area, and causing the small amount of leaked oil to flow back to the lubrication area. The small amount of leaked oil flows back to the lubrication area through the labyrinth seal and the oil return hole on the outer ring of the labyrinth seal.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. A low-speed motor is matched with a speed-increasing gear to achieve high-speed transmission, and the synchronous gear drives the rotor to rotate synchronously, avoiding mutual friction and collision between rotors. The overall layout is reasonable and the structure is compact. The transmission operation is smooth and the power transmission efficiency is high, reducing the cost of configuring a dedicated high-speed motor.

[0017] 2. The machine uses a shaft seal assembly combined with an embedded labyrinth seal structure, equipped with an air injection barrier, leakage collection and leakage backflow structure, which ensures stable and reliable sealing performance, prevents lubricating oil from leaking into the compression zone, and avoids compressed gas from entering the lubrication zone, ensuring stable operation of the dry screw compressor under oil-free compression conditions and improving the reliability of equipment operation.

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a front view of the present invention; Figure 3 yes Figure 2 AA section view; Figure 4 yes Figure 3 A magnified view of part A1; Figure 5 yes Figure 3 A magnified view of part of A2; Figure 6 yes Figure 2 Schematic diagram of the BB shaft seal assembly venting and return circulation; Figure 7 yes Figure 2 A schematic diagram of oil and gas leakage collection in the CC shaft seal assembly; Figure 8 This is a schematic diagram of the structure of the graphite ring in the shaft seal assembly of the present invention; Figure 9 This is a schematic diagram of the structure of the retaining ring in the shaft seal assembly of the present invention; Figure 10 This is a schematic diagram of the structure of the balance ring in the shaft seal assembly of the present invention; Figure 11 This is a schematic diagram of the structure of the condensate drain ring in the shaft seal assembly of the present invention; Figure 12 This is a schematic diagram of the structure of the air injection ring in the shaft seal assembly of the present invention; Figure 13 This is a schematic diagram of the structure of the labyrinth seal ring in the shaft seal assembly of the present invention; In the diagram: 1. Compressor housing; 2. Compression assembly; 3. Gear assembly; 4. Shaft seal assembly; Gear end cover 10, gear housing 11, rotor housing 12, exhaust housing 13, exhaust end cover 14, water injection hole 15, air blowing hole 16, vent hole 17, exhaust hole 18, air return hole 19, male rotor 20, female rotor 21; Air inlet 121, exhaust outlet 131; Gear bearing lubrication zone 110, gas compression zone 120, bearing lubrication zone 130; Drive shaft 30, speed-increasing gear set 31, synchronous gear set 32, driving gear 310, driven gear 311, M synchronous gear 320, F synchronous gear 321; Wave spring 40, graphite ring 41, fixing ring 42, balance ring 43, condensate draining ring 44, air injection ring 45, labyrinth seal ring 46, notch 47, condensate draining hole 48, air injection hole 49. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] like Figures 1-13 As shown, this embodiment provides a dry screw compressor with a reasonable structure, controllable cost, and reliable sealing and gear speed increase, including a compressor housing 1. The compressor housing is provided with a gas compression zone 120. The gas compression zone has a gear bearing lubrication zone 110 at the intake end and a bearing lubrication zone 130 at the exhaust end. The gear and bearing lubrication zone and the bearing and gear lubrication zone require lubricating oil, while the gas compression zone is oil-free. A compression assembly 2 is provided on the gas compression zone to complete the working gas compression operation. A shaft seal assembly 4 is provided on both the gear bearing lubrication zone and the bearing lubrication zone. A gear assembly 3 is also provided on the gear bearing lubrication zone next to the shaft seal assembly. The compression assembly includes a female rotor 21 and a male rotor 20; The shaft seal assemblies are all installed at the connection positions of the male and female rotors and their corresponding bearings to isolate the oil passage and the gas passage. They also include a gas-liquid leakage return ring group, an air injection barrier ring group, and an oil leakage return ring group along the direction from the gas compression zone to the gear bearing and bearing lubrication zone to isolate the mutual leakage of the lubricating oil in the gear bearing and bearing lubrication zone and the working fluid in the gas compression zone. The shaft seal assembly is divided into four groups: shaft seal assemblies located on the intake side of the male rotor and the intake side of the female rotor, which are used to prevent mutual leakage between the lubricating oil in the gear bearing lubrication area and the working fluid in the gas compression area; and shaft seal assemblies located on the exhaust side of the male rotor and the exhaust side of the female rotor, which are used to prevent mutual leakage between the lubricating oil in the bearing lubrication area and the working fluid in the gas compression area. The gear assembly includes a speed-increasing gear set 31 driven by a low-speed motor, which drives the male and female rotors via a synchronous gear set 32 ​​to achieve high-speed transmission.

[0024] In this embodiment of the invention, the compressor housing is assembled into a sealed compression chamber by sequentially connecting and fixing the gear end cover 10, gear housing 11, rotor housing 12, exhaust housing 13, and exhaust end cover 14 along the axial direction. An air inlet 121 is provided on the upper part of the rotor housing, and an exhaust port 131 is provided on the lower side of the exhaust housing. The compressor housing is also provided with a water injection hole 15, a blowing hole 16, a venting hole 17 (for exhaust, draining water droplets, and draining oil), an exhaust hole 18 (for collecting steam leaks, which can be reused and connected to the return air hole), and a return air hole 19. The exhaust hole is connected to the return air hole via a gas collecting pipe.

[0025] In this embodiment of the invention, the speed-increasing gear set includes a driving gear 310 and a driven gear 311 meshing with each other. A drive shaft 30 is coaxially fixedly connected to the driving gear, with one end of the drive shaft extending out of the housing and connected to a low-speed motor. The driven gear is coaxially fixedly connected to the male rotor. The difference in the number of teeth between the large-sized driving gear and the small-sized driven gear forms a fixed transmission ratio. Speed-increasing transmission is achieved by the driving gear driving the driven gear. The synchronous gear set includes an M synchronous gear 320 and an F synchronous gear 321 meshing with each other. The M synchronous gear is coaxially fixedly connected to the male rotor, and the F synchronous gear is coaxially fixedly connected to the female rotor. There is no direct contact transmission between the male and female rotors. The synchronous operation of the male and female rotors is achieved through the meshing transmission of the M synchronous gear and the F synchronous gear, which meets the working condition requirements of oil-free clean compression of the dry screw compressor.

[0026] In this embodiment of the invention, the gas-liquid leakage return ring assembly includes a wave spring 40, a graphite ring 41, a fixed ring 42, a balance ring 43, and a condensation discharge ring 44 along the direction from the gas compression zone to the gear bearing and the bearing lubrication zone. The gas injection barrier ring assembly includes a gas injection ring 45. The oil leakage return ring assembly includes a labyrinth seal ring 46. Wave springs and graphite rings are also provided inside the fixed ring, the balance ring, and the gas injection ring.

[0027] In this embodiment of the invention, the inner ring of the graphite ring is provided with a labyrinth sealing structure. The labyrinth groove of the labyrinth sealing structure forms a tortuous throttling channel, which gradually reduces the pressure of the lubricating oil and working gas moving along the axial surface and dissipates the energy through eddy currents, forming a highly efficient leakage barrier. The graphite ring and the male and female rotors are both clearance fits, and non-contact sealing is achieved by relying on gas film or liquid end, which is used to seal the trace leakage after the labyrinth sealing structure throttling, forming a secondary sealing protection.

[0028] In this embodiment of the invention, the outer circumference of the fixed ring has four notches 47, which are connected to the exhaust port; the fixed ring and the male and female rotors are in clearance fit, and the graphite ring is installed in its inner cavity. The inner ring of the graphite ring is provided with a labyrinth sealing structure to prevent gas from the gas compression zone from leaking to the lubrication zone.

[0029] In this embodiment of the invention, the balance ring is an annular component that forms a micro-gap sealing pair with the male and female rotors, achieving sealing by generating a damping effect through the gas leaking through the gap; the inner cavity of the balance ring is equipped with a graphite ring, and the inner ring of the graphite ring is provided with a labyrinth sealing structure to prevent gas from the gas compression zone from leaking to the lubrication zone; the balance ring is used to constrain the pressure fluctuations between the gas compression zone and the air blowing hole, thereby achieving load balance.

[0030] In this embodiment of the invention, the condensate draining ring is an annular component that forms a clearance fit with the male and female rotors. Multiple condensate draining holes 48 are evenly distributed around the outer circumference of the condensate draining ring. These holes are connected to the vent holes, allowing gas, water droplets, and oil to be discharged from the system through the condensate draining holes.

[0031] In this embodiment of the invention, the gas injection ring is an annular component that forms a clearance fit with the male and female rotors. The outer circumference of the gas injection ring is provided with four gas injection holes 49 for uniformly introducing gas. Graphite rings are respectively installed in the axial front and rear side cavities of the gas injection ring (the front and rear positions of the gas injection holes). The outer ring is also machined with an annular groove for setting a sealing ring. The graphite ring and the sealing ring form a cooperative sealing structure. The inner ring of the labyrinth sealing ring is provided with a labyrinth sealing structure, which uses throttling and eddy current effects to prevent oil leakage to the gas compression zone. Multiple oil return holes are evenly distributed on the outer circumference of the ring, and the oil flows back to the lubrication zone through the oil return holes.

[0032] A method for operating a gear-speed-increasing dry screw compressor, comprising the following steps: The working fluid enters the rotor housing through the inlet, is compressed by the meshing of the male and female rotors, and is discharged through the exhaust port at the bottom of the exhaust housing. No oil is involved in the entire compression process. During this period, if... Figure 5 As shown ( Figure 5 (To exaggerate the drawing style, the distance between the rotor and the parts on its shaft is enlarged). After the gas leaking from the gas compression zone passes through the graphite ring, fixed ring, balance ring, and condensate drain ring for throttling and sealing, a small amount of gas still leaks. Gas is injected into the injection ring through the blast hole to form a gas seal barrier, preventing the gas from continuing to flow into the lubrication zone and causing the small amount of leaked gas to flow back to the gas compression zone. The small amount of leaked gas and oil pass through the condensate drain ring and are led out to the vent hole through the condensate drain hole on the outer ring of the condensate drain ring. The remaining leaked gas passes through the fixed ring and is led out to the exhaust hole through the notch on the outer ring of the fixed ring. The exhaust hole flows back to the return air hole through the gas collection pipe for recycling. Even after the labyrinth seal seals the leaking oil in the gear bearing and bearing lubrication area, there is still leaking oil. Gas is injected into the air injection ring through the air blowing hole to form an air seal barrier, preventing the oil from continuing to flow into the gas compression area, and causing the small amount of leaked oil to flow back to the lubrication area. The small amount of leaked oil flows back to the lubrication area through the labyrinth seal and the oil return hole on the outer ring of the labyrinth seal.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A gear-speed-increasing dry screw compressor, characterized in that: The compressor includes a compressor housing, and a gas compression zone is provided inside the compressor housing. The intake end of the gas compression zone is a gear bearing lubrication zone, and the exhaust end is a bearing lubrication zone. A compression assembly is provided on the gas compression zone, and a shaft seal assembly is provided on both the gear bearing lubrication zone and the bearing lubrication zone. A gear assembly is also provided on the gear bearing lubrication zone next to the shaft seal assembly. The compression assembly includes a female rotor and a male rotor; The shaft seal assembly is set at the connection position of the male and female rotors and their corresponding bearings, and includes a gas-liquid leakage return ring group, an air injection barrier ring group, and an oil leakage return ring group along the direction from the gas compression zone to the gear bearing and bearing lubrication zone, in order to isolate the mutual leakage of the lubricating oil in the gear bearing and bearing lubrication zone and the working fluid in the gas compression zone. The gear assembly includes a speed-increasing gear set driven by a low-speed motor, which drives the male and female rotors via a synchronous gear set to achieve high-speed transmission.

2. The gear-speed-increasing dry screw compressor according to claim 1, characterized in that: The compressor housing is assembled into a sealed compression chamber by sequentially connecting and fixing the gear end cover, gear housing, rotor housing, exhaust housing, and exhaust end cover along the axial direction. An air inlet is provided on the top of the rotor housing, and an exhaust outlet is provided on the lower side of the exhaust housing. The compressor housing is also provided with a water injection hole, an air blowing hole, a venting hole, an exhaust hole, and a return air hole. The exhaust hole is connected to the return air hole through an air collecting pipe.

3. The gear-speed-increasing dry screw compressor according to claim 1, characterized in that: The speed-increasing gear set includes a driving gear and a driven gear that mesh with each other. A drive shaft is coaxially fixedly connected to the driving gear, and the driven gear is coaxially fixedly connected to the male rotor. The difference in the number of teeth between the large-sized driving gear and the small-sized driven gear forms a fixed transmission ratio. Speed-increasing transmission is achieved by the driving gear driving the driven gear. The synchronizing gear set includes an M synchronizing gear and an F synchronizing gear that mesh with each other. The M synchronizing gear is coaxially fixedly connected to the male rotor, and the F synchronizing gear is coaxially fixedly connected to the female rotor. There is no direct contact transmission between the male and female rotors. The synchronous operation of the male and female rotors is achieved through the meshing transmission of the M synchronizing gear and the F synchronizing gear.

4. The gear-speed-increasing dry screw compressor according to claim 2, characterized in that: The gas-liquid leakage return ring assembly includes a wave spring, a graphite ring, a fixed ring, a balance ring, and a condensation discharge ring along the direction from the gas compression zone to the gear bearing and bearing lubrication zone. The gas injection barrier ring assembly includes a gas injection ring. The oil leakage return ring assembly includes a labyrinth seal ring. The fixed ring, balance ring, and gas injection ring are also equipped with wave springs and graphite rings.

5. The gear-speed-increasing dry screw compressor according to claim 4, characterized in that: The inner ring of the graphite ring is provided with a labyrinth seal structure. The labyrinth groove of the labyrinth seal structure forms a tortuous throttling channel, which gradually reduces the pressure of the lubricating oil and working gas moving along the axial surface and dissipates the energy through eddy currents, forming a highly efficient leakage barrier. The graphite ring and the male and female rotors are both clearance fit, and non-contact sealing is achieved by relying on gas film or liquid end, which is used to seal the trace leakage after the labyrinth seal structure throttling, forming a secondary sealing protection.

6. The gear-speed-increasing dry screw compressor according to claim 4, characterized in that: The outer circumference of the fixed ring has several notches, which connect to the exhaust port. The fixed ring and the male and female rotors are in clearance fit. The graphite ring is installed in the inner cavity. The inner ring of the graphite ring is provided with a labyrinth sealing structure to prevent gas from the gas compression zone from leaking to the lubrication zone.

7. The gear-speed-increasing dry screw compressor according to claim 4, characterized in that: The balance ring is a ring-shaped component that forms a micro-gap sealing pair with the male and female rotors. The gas leaking through the gap generates a damping effect to achieve sealing. The inner cavity of the balance ring is equipped with a graphite ring, and the inner ring of the graphite ring is provided with a labyrinth sealing structure to prevent gas from the gas compression zone from leaking into the lubrication zone. The balance ring is used to constrain the pressure fluctuations between the gas compression zone and the air blowing hole to achieve load balance.

8. The gear-speed-increasing dry screw compressor according to claim 4, characterized in that: The condensate draining ring is a ring-shaped component that forms a clearance fit with the male and female rotors. Multiple condensate draining holes are evenly distributed around the outer circumference of the condensate draining ring. These holes are connected to the vent holes, allowing gas, water droplets, and oil to be discharged from the system.

9. The gear-speed-increasing dry screw compressor according to claim 4, characterized in that: The gas injection ring is an annular component that forms a clearance fit with the male and female rotors. The outer circumference of the gas injection ring has several gas injection holes for uniformly introducing gas. Graphite rings are installed on the front and rear cavities of the axial direction of the gas injection ring, and the outer ring is also machined with an annular groove for setting a sealing ring. The graphite ring and the sealing ring form a cooperative sealing structure. The inner ring of the labyrinth sealing ring has a labyrinth sealing structure, which uses throttling and eddy current effects to prevent oil leakage to the gas compression zone. Multiple oil return holes are evenly distributed on the outer circumference of the ring, through which the oil flows back to the lubrication zone.

10. A method of operating a gear-speed-increasing dry screw compressor as described in any one of claims 1-9, characterized in that, Follow these steps: The working fluid enters the rotor housing through the inlet, is compressed by the meshing of the male and female rotors, and is discharged through the exhaust port at the bottom of the exhaust housing. No oil is involved in the entire compression process. During this period: After the gas leaking from the gas compression zone passes through the graphite ring, fixed ring, balance ring, and condensate drain ring for throttling and sealing, a small amount of gas still leaks. Gas is injected into the injection ring through the blast hole to form a gas seal barrier, preventing the gas from continuing to flow into the lubrication zone and causing the small amount of leaked gas to flow back to the gas compression zone. The small amount of leaked gas and oil pass through the condensate drain ring and are led out to the vent hole through the condensate drain hole on the outer ring of the condensate drain ring. The remaining leaked gas passes through the fixed ring and is led out to the exhaust hole through the notch on the outer ring of the fixed ring. The exhaust hole flows back to the return air hole through the gas collection pipe for recycling. Even after the labyrinth seal seals the leaking oil in the gear bearing and bearing lubrication area, there is still leaking oil. Gas is injected into the air injection ring through the air blowing hole to form an air seal barrier, preventing the oil from continuing to flow into the gas compression area, and causing the small amount of leaked oil to flow back to the lubrication area. The small amount of leaked oil flows back to the lubrication area through the labyrinth seal and the oil return hole on the outer ring of the labyrinth seal.

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