Water-lubricated double-screw compressor

Abstract

The invention provides a water-lubricated double-screw compressor, and relates to the technical field of compressors, the water-lubricated double-screw compressor comprises a rotor arranged in a shell, radial bearings arranged at the two ends of the rotor in a sleeving manner, bearing seats in interference fit with the peripheries of the two radial bearings, and two single-end-face sealing assemblies arranged on the face, opposite to the radial bearings, of the rotor; a thrust bearing assembly is arranged on one side of the output end of the rotor and used for limiting axial displacement of the rotor, and the synchronous gear is installed at the end of the rotor. Water inlet channels are formed in the positions, on the radial bearing, the single-end-face sealing assembly, the thrust bearing assembly and the synchronous gear, of the shell and communicated with a water supply assembly, a water return channel is formed in the shell, and the other end of the water return channel is connected with the water supply assembly to form a water circulation loop. The technical problems of increasing the length of the rotor and discharging oil and water in a mixed mode are solved, and the technical effects of no loss of medium gas, low emission, high environmental protection and reduction of the length of the rotor are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a water-lubricated twin-screw compressor. Background Art

[0002] Twin-screw compressors are widely used in industrial processes due to their high reliability, low maintenance costs, simple infrastructure, adaptability to process fluctuations, and tolerance of dust and liquid in the medium. However, process twin-screw compressors, which often handle flammable, explosive, extremely hazardous, or expensive gases, must simultaneously meet two core requirements: limiting environmental leakage and preventing lubricant contamination.

[0003] In order to balance the problems of medium gas leakage and lubricating oil contamination, conventional twin-screw compressors mainly use two solutions: carbon ring seals or dry gas seals. Carbon ring seals consume a lot of nitrogen and it is difficult to achieve zero leakage. In addition, in liquid injection twin-screw compressors, the gas-liquid two-phase mixture will erode the carbon rings, greatly shortening their lifespan. Dry gas seals are expensive and require a complex air supply and regulation system, and the overall structure is complex.

[0004] In the prior art, Chinese patent CN201721261031.8 (Shaft sealing device for oil-free twin-screw compressor) proposes injecting water into a double-end mechanical seal to achieve sealing using a water film, thereby fundamentally avoiding the phenomenon of existing mechanical seals using oil or dry gas as the sealing medium and causing contamination of the working medium steam in the working chamber.

[0005] However, the above technology requires the addition of front seals and rear seals before and after the main seal, which increases the length of the rotor, affecting the strength of the shaft and the operating range of the compressor; in addition, a small amount of high-pressure lubricating oil will still be mixed with the sealing water and discharged, causing certain pollution to the environment. Summary of the Invention

[0006] The purpose of the present invention is to provide a water-lubricated twin-screw compressor to alleviate the technical problems existing in the prior art of adding an isolation seal, increasing the rotor length, and a small amount of high-pressure lubricating oil being mixed and discharged with the sealing end face and the sealing water.

[0007] The present invention provides a water-lubricated twin-screw compressor, comprising: a rotor, a housing, a radial bearing, a bearing seat, a single-end seal assembly, a thrust bearing assembly, a synchronous gear, a water inlet channel, a water supply assembly, and a water return channel; The rotor is arranged inside the housing, and radial bearings are sleeved at both ends of the rotor. The outer periphery of the two radial bearings is interference-fitted with a bearing seat. Two single-end face seal assemblies are provided on the side of the rotor opposite to the radial bearings. A thrust bearing assembly is provided on the output end of the rotor to limit the axial displacement of the rotor. The synchronous gear is installed at the end of the rotor. The shell is provided with water inlet channels at the radial bearing, single-end seal assembly, thrust bearing assembly and synchronous gear. The water inlet channel is connected to the water supply assembly. A return water channel is provided on the shell, and the other end of the return water channel is connected to the water supply assembly to form a water circulation loop.

[0008] Furthermore, the single-end seal assembly includes a static ring, a dynamic ring and a sealing labyrinth; The stationary ring and sealing labyrinth are fixed on the housing, and the dynamic ring is installed on the rotor to rotate; The water inlet channel is injected into the static ring and the dynamic ring through the shell to provide lubrication and remove friction heat.

[0009] Further, the thrust bearing assembly includes a rotating member and a stationary member; The stationary part is fixed on the housing, and the rotating part is mounted on the rotor and rotates; The water inlet channel is injected into the stationary part through the shell.

[0010] Furthermore, the bearing seat includes a bearing seat body, bolt holes and drainage holes; The outer peripheral surface of the bearing seat body is provided with a plurality of bolt holes around the rotor for fixing, and a drainage hole is provided at the vertical extension line of the rotor center, and the drainage hole is connected to the return water channel.

[0011] Furthermore, the water provided by the water supply component is softened water.

[0012] Furthermore, the water supply assembly includes a water tank, a water pump, a filter and a cooler arranged in sequence along the water flow direction; The output end of the cooler is connected to the water inlet channel, and the return water channel is connected to the water tank.

[0013] Furthermore, the synchronous gear is made of zirconium oxide or silicon oxide.

[0014] Furthermore, a return water channel is opened on the housing and the bearing seat, the input end of the return water channel is respectively connected to the drainage parts of the radial bearing, single end face seal assembly, thrust bearing assembly and synchronous gear, and the output end of the return water channel is connected to the water supply assembly.

[0015] Furthermore, the rotors are a female rotor and a male rotor, and the two rotors act on each other to compress the gas.

[0016] Furthermore, a shaft seal is provided at one end of the rotor away from the synchronous gear.

[0017] Beneficial effects: The water-lubricated twin-screw compressor provided by the present invention fully utilizes water as a lubricating medium and circulates it, thereby simultaneously lubricating and cooling the mechanical seal, bearings and synchronous gears.

[0018] The present invention achieves a gas-tight seal without loss of medium. The mechanical seal near the compression chamber utilizes water lubrication, fundamentally avoiding contamination of the working medium within the working chamber by existing mechanical seals that use lubricating oil or dry gas as the sealing medium. Furthermore, it eliminates the nitrogen leakage into the working chamber that can occur with other mechanical seals, such as those found in inflatable carbon ring seals or dry gas seals.

[0019] In addition, the use of water lubrication eliminates the problem of lubricating oil pollution; it also eliminates the need for a complex lubricating oil system, causes little pollution to the environment, and is environmentally friendly.

[0020] Furthermore, compared to traditional screw compressors that use double mechanical seals or dry gas seals, single water-lubricated mechanical seals can reduce seal manufacturing costs. The water-lubricated single seal, bearings, and synchronous gears minimize rotor length while achieving sealing, support, and synchronous rotation, thereby improving rotor strength and rigidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of a water-lubricated twin-screw compressor provided in an embodiment of the present invention; Figure 2 A schematic structural diagram of a rotor on one side of a synchronous gear in a water-lubricated twin-screw compressor provided by an embodiment of the present invention; Figure 3 A schematic structural diagram of a bearing seat in a water-lubricated twin-screw compressor provided by an embodiment of the present invention; Figure 4 A schematic diagram of the discharge flow direction of water in a water-lubricated twin-screw compressor provided in an embodiment of the present invention.

[0023] Icons: 1-rotor; 2-housing; 3-radial bearing; 4-bearing seat; 401-bearing seat body; 402-bolt hole; 403-drain hole; 5-single end face seal assembly; 501-static ring; 502-dynamic ring; 503-sealing labyrinth; 6-thrust bearing assembly; 601-rotating part; 602-stationary part; 7-synchronizing gear; 8-water inlet channel; 9-water supply assembly; 901-water tank; 902-water pump; 903-filter; 904-cooler; 10-return water channel; 11-shaft seal. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0027] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0029] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0030] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0031] like Figure 1 、 Figure 2 As shown, the water-lubricated twin-screw compressor disclosed in the present invention includes: a rotor 1, a housing 2, a radial bearing 3, a bearing seat 4, a single-end seal assembly 5, a thrust bearing assembly 6, a synchronous gear 7, a water inlet channel 8, a water supply assembly 9 and a water return channel 10; The rotor 1 is arranged inside the housing 2, and radial bearings 3 are sleeved on both ends of the rotor 1. The outer circumferences of the two radial bearings 3 are interference-fitted with bearing seats 4. Two single-end face seal assemblies 5 are provided on the side of the rotor 1 opposite the radial bearings 3. A thrust bearing assembly 6 is provided on the output end of the rotor 1 to limit the axial displacement of the rotor 1. A synchronous gear 7 is installed at the end of the rotor 1. The housing 2 is provided with a water inlet channel 8 at the radial bearing 3, the single-end face seal assembly 5, the thrust bearing assembly 6 and the synchronous gear 7. The water inlet channel 8 is connected to the water supply assembly 9. The housing 2 is provided with a return water channel 10. The other end of the return water channel 10 is connected to the water supply assembly 9 to form a water circulation loop.

[0032] Specifically, the compressor contains two rotors 1. Rotor 1 is a male rotor that extends through the interior of the housing 2. Radial bearings 3 are sleeved on the outer circumferential surfaces of both ends of the rotor. The inner ring of the radial bearing 3 has a clearance fit with the outer circumferential surface of the rotor 1 to provide rotational support, while the outer ring has an interference fit with the inner hole of the bearing seat 4. The bearing seat 4 is fixed to the corresponding mounting holes of the housing 2 via circumferentially distributed bolts, providing bidirectional radial positioning for the rotor 1. A single-end seal assembly 5 is correspondingly arranged on the side of the rotor 1 closest to the compression chamber and located on the opposite inner sides of the two radial bearings 3 (i.e., between the radial bearings 3 and the compression chamber). Its static ring 501 is bolted to the end face of the sealing chamber of the housing 2, while the dynamic ring 502 rotates synchronously with the rotor 1. The end faces of the static ring 501 and the dynamic ring 502 fit tightly together to form the main sealing surface. The thrust bearing assembly 6 is located at the output end of rotor 1. Its stationary component 602 is bolted to the end cap of housing 2, while the rotating component 601 is keyed onto the shoulder of rotor 1. The thrust surfaces of these components engage with each other to limit axial movement of rotor 1. A synchronous gear 7 is keyed to the end shaft of rotor 1 and meshes with the synchronous gear of the female rotor on the other side. Water inlet channels 8 are provided on housing 2 to correspond to the clearance between the inner and outer rings of radial bearing 3, the sealing surface of the single-end seal assembly 5, the thrust surface of the thrust bearing assembly 6, and the meshing tooth surface of the synchronous gear 7. The inlets of each water inlet channel 8 are connected to the output end of the water supply assembly 9 through a water collection pipeline. A return water channel 10 is provided at the bottom of housing 2 and on the side of bearing seat 4. The outlet is connected to the return water inlet of the water supply assembly 9 through a return water pipeline, forming a closed water circulation loop.

[0033] Single-end seal assembly 5 is positioned directly adjacent to the compression chamber, eliminating the need for additional seals used to isolate lubricating oil or sealing gas in the prior art. Combined with the compact connection between bearing seat 4 and housing 2, this shortens the axial length of rotor 1, reduces deflection, and improves its rigidity and stability during operation. Softened water injected into single-end seal assembly 5 lubricates the sealing end faces formed by the contact between mechanical seal stationary ring 501 and mechanical seal dynamic ring 502, while also removing frictional heat generated by the rotation of the sealing end faces. Mechanical seal labyrinth 503 acts as a throttling mechanism, maintaining the pressure of the softened water injected into the mechanical seal above the pressure of the sealed medium.

[0034] The radial bearing 3, single-end seal assembly 5, thrust bearing assembly 6 and synchronous gear 7 share the same water supply assembly 9. Lubricating cooling water is accurately distributed through the water inlet channel 8 and recycled through the return channel 10. This not only avoids the contamination of the lubricating oil to the medium gas and the impact on the environment, but also realizes real-time cooling of each friction pair through the efficient thermal conductivity of water.

[0035] Furthermore, the mechanical seal near the compression chamber of this invention utilizes water lubrication, fundamentally avoiding the contamination of the working medium within the working chamber caused by existing mechanical seals that use lubricating oil or dry gas as the sealing medium. Furthermore, this eliminates the nitrogen leakage issues associated with inflatable carbon ring seals or dry gas seals. Furthermore, water lubrication eliminates the risk of lubricating oil contamination. This eliminates the need for complex lubricating oil systems, resulting in minimal environmental impact and enhanced environmental friendliness.

[0036] In an embodiment of the present invention, the single-end face sealing assembly 5 includes a stationary ring 501, a dynamic ring 502 and a sealing labyrinth 503; the stationary ring 501 and the sealing labyrinth 503 are fixed on the housing 2, and the dynamic ring 502 is installed on the rotor 1 for rotation; the water inlet channel 8 is injected into the stationary ring 501 and the dynamic ring 502 through the housing 2 to provide lubrication and remove friction heat.

[0037] The thrust bearing assembly 6 includes a rotating part 601 and a stationary part 602 ; the stationary part 602 is fixed on the housing 2 , and the rotating part 601 is mounted on the rotor 1 for rotation; the water inlet channel 8 is injected into the stationary part 602 through the housing 2 .

[0038] like Figure 3 As shown, the bearing seat 4 includes a bearing seat body 401, bolt holes 402 and drainage holes 403; the outer surface of the bearing seat body 401 is provided with a plurality of bolt holes 402 around the rotor 1 for fixing, and a drainage hole 403 is provided at the vertical extension line of the center of the rotor 1, and the drainage hole 403 is connected to the return water channel 10.

[0039] Specifically, in the single-end face sealing assembly 5, the stationary ring 501 is fixed to the inner wall end face of the shell 2 close to the compression chamber by hexagon socket bolts evenly distributed circumferentially, and its sealing end face faces the rotor 1; the dynamic ring 502 is interference fit with the outer circumferential surface of the rotor 1 through the shaft sleeve, and rotates synchronously with the rotor 1, and the sealing end face of the dynamic ring 502 is tightly fitted with the sealing end face of the static ring 501 to form a main sealing pair; the sealing labyrinth 503 is an annular structure, and a stepped annular gap is formed between its inner wall and the outer wall of the dynamic ring 502. The outlet of the water inlet channel 8 on the shell 2 is opposite to the sealing surface gap between the static ring 501 and the dynamic ring 502, which is used to accurately inject lubricating water into this area.

[0040] In the thrust bearing assembly 6, the thrust surface of the stationary part 602 faces the rotor 1; the rotating part 601 is connected to the rotor 1 through a flat key and rotates with the rotor 1, and the thrust surface of the rotating part 601 is parallel to the thrust surface of the stationary part 602. The outlet of the water inlet channel 8 corresponding to the thrust bearing assembly 6 on the housing 2 leads to the thrust surface of the stationary part 602.

[0041] The outer surface of the bearing seat body 401 of the bearing seat 4 is evenly provided with 4-6 bolt holes 402 around the axis of the rotor 1, which are used to fix the bearing seat 4 in the bearing mounting cavity of the housing 2 by bolts; the drainage hole 403 is a stepped hole that passes through the bearing seat body 401 along the vertical extension line of the central axis of the rotor 1. Its inlet is connected to the outer ring drainage groove of the radial bearing 3, and the outlet is sealed with the return water channel 10 on the housing 2 through a pipeline.

[0042] The compact layout of the static ring 501, dynamic ring 502 and sealing labyrinth 503 of the single-end face sealing assembly 5, combined with the water supply of the water inlet channel 8, can not only maintain the water pressure on the sealing surface higher than the medium gas pressure through the step gap of the sealing labyrinth 503 to prevent medium leakage, but also eliminate the traditional isolation seal, shorten the axial length of the rotor 1, and improve the rotor rigidity; the fit between the stationary part 602 and the rotating part 601 of the thrust bearing assembly 6, combined with the direct lubrication of the thrust surface by the water inlet channel 8, can efficiently withstand axial force and reduce friction loss; the bolt hole 402 of the bearing seat 4 ensures that the radial bearing 3 is firmly installed, and the connection between the drain hole 403 and the return water channel 10 completes the closed-loop recovery of the lubricating water.

[0043] In the embodiment of the present invention, the water provided by the water supply component 9 is softened water.

[0044] The water supply assembly 9 includes a water tank 901, a water pump 902, a filter 903, and a cooler 904 arranged in sequence along the water flow direction. The output end of the cooler 904 is connected to the water inlet channel 8, and the return channel 10 is connected to the water tank 901. The material of the synchronous gear 7 is zirconium oxide or silicon oxide.

[0045] Specifically, water tank 901 serves as a storage and recovery unit for softened water. The outlet of water tank 901 is connected to the suction end of water pump 902 via a flange. The discharge end of water pump 902 is connected to the inlet of filter 903 via a high-pressure pipeline. Filter 903 contains a filter element, and its outlet is connected to the water inlet of cooler 904 via a pipeline. Cooler 904 adopts a shell and tube type, and its outlet is sealedly connected to the summary inlet of water inlet channel 8 on shell 2 via the main water supply pipeline. After the end of return water channel 10 is summarized, it is connected to the return water outlet of water tank 901 via the return water pipeline, forming a complete softened water circulation path. Each component is arranged horizontally on one side of the unit base in sequence along the direction of water flow. Water tank 901 is located at the lowest position to facilitate the natural inflow of return water. Water pump 902, filter 903, and cooler 904 are fixed to the base via a bracket.

[0046] The synchronous gear 7 is a spur gear. The synchronous gears 7 on the two rotors 1 mesh with each other. The synchronous gear 7 made of zirconium oxide or silicon oxide not only has excellent wear resistance to withstand meshing impact, but also has good water resistance (does not chemically react with softened water) and a low friction coefficient, which can reduce energy loss during water lubrication.

[0047] The water supply component 9 ensures that the softened water entering the water inlet channel 8 is clean (to avoid clogging the sealing surface or bearing gap). The closed-loop circulation makes the softened water reusable, reducing operating costs. The material of the synchronous gear 7 is adapted to the water lubrication environment, avoiding the problem of traditional metal gears being easily rusted in water media, and ensuring the synchronous rotation accuracy of the rotor 1.

[0048] In an embodiment of the present invention, a return water channel 10 is opened on the housing 2 and the bearing seat 4, and the input end of the return water channel 10 is respectively connected to the drainage parts of the radial bearing 3, the single end face seal assembly 5, the thrust bearing assembly 6 and the synchronous gear 7, and the output end of the return water channel 10 is connected to the water supply assembly 9.

[0049] The rotors 1 are a female rotor and a male rotor, and the two rotors 1 act on each other to compress the gas.

[0050] A shaft seal 11 is provided at one end of the rotor 1 away from the synchronous gear 7 .

[0051] Specifically, the female and male rotors of rotor 1 are arranged parallel to each other within housing 2. The axial spacing between the two rotors matches the tooth profile parameters. The tooth surfaces mesh with each other, and a precise clearance is maintained by synchronous gears 7 (synchronous gears are mounted on the ends of the female and male rotors, respectively). An intake-side shaft seal 11 further prevents medium gas leakage.

[0052] Based on the above embodiment, the specific working process of the water-lubricated twin-screw compressor of the present invention is as follows: like Figure 4As shown, after the water supply assembly 9 is started, the softened water in the water tank 901 is pressurized by the water pump 902, passes through the filter 903 to remove impurities, and is cooled by the cooler 904. It is then transported through the water inlet channel 8 on the housing 2 to the radial bearing 3, the single end face seal assembly 5, the thrust bearing assembly 6 and the synchronous gear 7.

[0053] Rotor 1 is driven to rotate, with the male and female rotors compressing the gas within housing 2 via end-synchronizing gears 7. The sealing labyrinth 503 of the single-end seal assembly 5 maintains a higher water pressure than the medium gas pressure to prevent leakage. The radial bearing 3 limits radial movement of rotor 1, and the thrust bearing assembly 6 offsets axial forces, ensuring stable rotation of rotor 1.

[0054] The water that has completed lubrication and cooling is collected through the return water channel 10 on the housing 2 and the bearing seat 4. The return water flows into the return water channel 10 through the drainage hole 403 of the bearing seat 4. The return water of the single end face seal assembly 5, the thrust bearing assembly 6 and the synchronous gear 7 is directly collected into the main return water channel of the housing 2, and finally all flows back to the water tank 901, forming a closed-loop water circulation.

[0055] 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 it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water-lubricated twin-screw compressor, characterized in that: include: Rotor (1), housing (2), radial bearing (3), bearing seat (4), single end face seal assembly (5), thrust bearing assembly (6), synchronous gear (7), water inlet channel (8), water supply assembly (9) and water return channel (10); The rotor (1) is arranged inside the housing (2), the radial bearings (3) are sleeved on both ends of the rotor (1), the outer peripheries of the two radial bearings (3) are interference-fitted with the bearing seats (4), the rotor (1) is provided with two single-end face sealing assemblies (5) on the side opposite to the radial bearings (3), a thrust bearing assembly (6) is provided on one side of the output end of the rotor (1) for limiting the axial displacement of the rotor (1), and the synchronous gear (7) is installed at the end of the rotor (1); The housing (2) is provided with a water inlet channel (8) at the radial bearing (3), the single-end seal assembly (5), the thrust bearing assembly (6) and the synchronous gear (7), the water inlet channel (8) being connected to a water supply assembly (9), and the housing (2) is provided with a water return channel (10), the other end of which is connected to the water supply assembly (9), forming a water circulation loop.

2. The water-lubricated twin-screw compressor according to claim 1, characterized in that: The single-end face sealing assembly (5) comprises a stationary ring (501), a dynamic ring (502) and a sealing labyrinth (503); The stationary ring (501) and the sealing labyrinth (503) are fixed on the housing (2), and the dynamic ring (502) is mounted on the rotor (1) for rotation; The water inlet channel (8) is injected into the stationary ring (501) and the dynamic ring (502) through the housing (2) to provide lubrication and remove friction heat.

3. The water-lubricated twin-screw compressor according to claim 1, characterized in that: The thrust bearing assembly (6) comprises a rotating part (601) and a stationary part (602); The stationary part (602) is fixed on the housing (2), and the rotating part (601) is mounted on the rotor (1) to rotate; The water inlet channel (8) is injected into the stationary part (602) through the housing (2).

4. The water-lubricated twin-screw compressor according to claim 1, characterized in that: The bearing seat (4) comprises a bearing seat body (401), a bolt hole (402) and a drainage hole (403); The outer peripheral surface of the bearing seat body (401) is provided with a plurality of bolt holes (402) around the rotor (1) for fixing, and a drainage hole (403) is provided at a vertical extension line of the center of the rotor (1), and the drainage hole (403) is connected to the return water channel (10).

5. The water-lubricated twin-screw compressor according to claim 1, characterized in that: The water provided by the water supply component (9) is softened water.

6. The water-lubricated twin-screw compressor according to claim 5, characterized in that: The water supply assembly (9) comprises a water tank (901), a water pump (902), a filter (903), and a cooler (904) arranged in sequence along the water flow direction; The output end of the cooler (904) is connected to the water inlet channel (8), and the water return channel (10) is connected to the water tank (901).

7. The water-lubricated twin-screw compressor according to claim 1, characterized in that: The material of the synchronous gear (7) is zirconium oxide or silicon oxide.

8. The water-lubricated twin-screw compressor according to claim 1, characterized in that: The return water channel (10) is provided on the housing (2) and the bearing seat (4); the input end of the return water channel (10) is respectively connected to the radial bearing (3), the single end seal assembly (5), the thrust bearing assembly (6) and the drainage portion of the synchronous gear (7); and the output end of the return water channel (10) is connected to the water supply assembly (9).

9. The water-lubricated twin-screw compressor according to claim 1, characterized in that: The rotors (1) are a female rotor and a male rotor, and the two rotors (1) act on each other to compress gas.

10. The water-lubricated twin-screw compressor according to claim 1, characterized in that: A shaft seal (11) is provided at one end of the rotor (1) facing away from the synchronous gear (7).

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