A sealing device for a screw gas compressor

Abstract

The application relates to the technical field of compressor application, in particular to a sealing device of a screw gas compressor, which comprises a screw rotor, a mounting cylinder, an outer sleeve shell one and an outer sleeve shell two, the front ends of the outer sleeve shell one and the outer sleeve shell two are integrally fixedly connected with mounting walls, a static ring mechanism is arranged on the mounting walls, a dynamic ring is arranged on the front side of the static ring mechanism, a plurality of screw grooves are circumferentially and equidistantly arranged on the rear side edge position of the dynamic ring, the front and rear dynamic rings are fixedly connected on the mounting cylinder, the mounting cylinder passes through the centers of the outer sleeve shell one and the outer sleeve shell two, and the screw rotor is fixedly connected in the mounting cylinder. The static ring mechanism can effectively improve the stability of the static ring work, avoid the problem of unstable static ring, cause mechanical noise, can reduce the heat generated by the friction between the static ring and the airflow in a cooling mode, avoid the change of the smoothness of the static ring caused by high temperature, and further ensure the stable work of the static ring.

Description

Technical Field

[0001] The present invention relates to the technical field of compressor applications, and in particular to a sealing device for a screw gas compressor. Background Art

[0002] A screw gas compressor is a commonly used positive displacement compressor, mainly used to increase the pressure of gas. It compresses the gas by rotating two intermeshing screw rotors. This type of compressor is widely used in industrial fields such as chemical, petroleum, natural gas, and food processing. The working principle of a screw gas compressor is that as the rotors rotate, the space between the two screw rotors gradually decreases, thereby compressing and discharging the inhaled gas. The specific process includes four stages: suction, delivery, compression, and exhaust.

[0003] Due to the high pressure inside the screw gas compressor, the screw gas compressor will be sealed to prevent gas leakage. The sealing of the screw gas compressor is one of the key factors to ensure its efficient and reliable operation. A good sealing design can improve the working efficiency and safety of the compressor. The sealing methods of screw gas compressors generally include the following: labyrinth seals, mechanical seals, packing seals, floating ring seals and dry gas seals. Among them, dry gas seal is an advanced sealing technology that uses externally provided clean gas (usually nitrogen) to form a stable gas film between the dynamic and static rings, which not only avoids wear caused by direct contact, but also effectively prevents leakage of process gas. Dry gas seals are widely used in modern industry due to their high efficiency and low maintenance.

[0004] The structure of the static ring of the existing dry gas sealing equipment is relatively simple. It is composed of multiple springs and a static ring. The spring has a high degree of freedom, and the end of the spring away from the static ring is the movable end. The static ring is supported by the movable spring, and the overall stability is insufficient. This will cause the airflow friction generated by the rotation of the dynamic ring to exert a tangential force on the static ring. The static ring with insufficient stability will produce a certain degree of deflection. During the deflection process, the movable end of the spring will change position and generate mechanical noise. At the same time, the static ring will gradually increase in temperature due to the influence of the airflow friction. When the temperature exceeds the heat limit of the static ring, the smoothness of the static ring will change, which is not conducive to ensuring the sealing effect. Summary of the Invention

[0005] Technical problem to be solved: The present invention provides a sealing device for a screw gas compressor, which can solve the above-mentioned problems.

[0006] Technical solution: In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a sealing device for a screw gas compressor, comprising a screw rotor, a mounting barrel, an outer shell one and an outer shell two, the front end interiors of the outer shell one and the outer shell two are integrally fixedly connected with a mounting wall, a static ring mechanism is provided on the mounting wall, a dynamic ring is provided on the front side of the static ring mechanism, a plurality of screw grooves are equidistantly provided on the circumference of the edge of the rear side surface of the dynamic ring, the front and rear dynamic rings are fixedly connected to the mounting barrel, the mounting barrel passes through the center of the outer shell one and the outer shell two, the screw rotor is fixedly connected in the mounting barrel, the static ring mechanism comprises a static ring body arranged at the rear side of the dynamic ring, a mounting ring is fixedly connected to the rear side of the static ring body, a limiting component for mounting the static ring body on the mounting wall is provided on the rear side of the mounting ring, and a cooling component for cooling the static ring body is also provided on the rear side of the mounting ring.

[0007] The limiting assembly includes a tightening ring fixedly connected to the rear side of the mounting ring by a number of bolts, and a number of telescopic rods are fixedly connected to the rear circumference of the tightening ring at equal intervals. The telescopic rods are double-section rods, and the rear ends of the several telescopic rods are fixedly connected to a connecting ring. A spring is provided on the telescopic rod, and a locking component is provided on the rear side of the connecting ring.

[0008] The cooling assembly includes liquid joints that are centrally symmetrical and integrally fixed to the front side of the mounting ring. One group of liquid joints is used for liquid inlet, and the other group of liquid joints is used for liquid discharge. Both groups of liquid joints are provided with connecting pipe components, and a cooling channel unit is provided inside the mounting ring.

[0009] By using the restriction component and the cooling component in conjunction with each other, the static ring body can be stabilized and operate in a low-noise manner.

[0010] As a preferred technical solution of the present invention, the locking component includes a ring groove corresponding to the position of the connecting ring and opened on the front side of the mounting wall, a plurality of embedding holes are opened at equal intervals on the inner circumference of the ring groove, and a plurality of reducing rods are fixedly connected at equal intervals on the rear side of the connecting ring, and the reducing rods and the embedding holes are distributed in a one-to-one correspondence.

[0011] As a preferred technical solution of the present invention, an interlayer cavity is provided on the rear side of the annular groove, a partition is left between the interlayer cavity and the annular groove, the embedded hole extends along the rotation direction of the dynamic ring to form a stop groove, the width of the stop groove is smaller than the diameter of the embedded hole, the thin rod section of the reducing rod cooperates with the stop groove, and the thick rod section of the reducing rod cooperates with the embedded hole and extends into the interlayer cavity.

[0012] As a preferred technical solution of the present invention, the connecting pipe component includes an external connecting pipe extending to the interior of the liquid joint, and one end of the external connecting pipe close to the liquid joint is rotatably connected to a screw cap through a sealed bearing, and the screw cap is threadedly connected to the outer wall of the liquid joint. Four groups of external connecting pipes extend to the outside of outer shell one and outer shell two through pipe holes respectively, and the pipe holes are correspondingly opened on the shell walls of outer shell one and outer shell two. The two groups of external connecting pipes on the same mounting ring are respectively connected to the external coolant delivery system pipeline.

[0013] As a preferred technical solution of the present invention, a sealing ring is embedded and fixed in the end of the liquid-through joint, and the sealing ring contacts the inner wall of the screw cap.

[0014] As a preferred technical solution of the present invention, the cooling channel unit includes a bifurcation groove opened inside the mounting ring and connected to the liquid inlet liquid joint, and the branches on both sides of the bifurcation groove are connected to a plurality of arc grooves, and the arc grooves on both sides of the bifurcation groove are connected to a central groove at one end away from the liquid inlet liquid joint, and the central groove is connected to the liquid discharge liquid joint.

[0015] As a preferred technical solution of the present invention, the end of the outer shell 2 close to the outer shell 1 is fixedly connected with a docking ring, the diameter of the docking ring is smaller than the diameter of the outer shell 2, and the end of the outer shell 1 close to the outer shell 2 is provided with a docking port that cooperates with the outer contour of the docking ring.

[0016] As an optimal technical solution of the present invention, a plurality of bolt mounting holes are equidistantly opened on the outer wall of the docking interface, and threaded holes are opened on the docking ring corresponding to the plurality of bolt mounting holes. Fixing bolts are placed in the bolt mounting holes, and the fixing bolts are threadedly connected in the threaded holes.

[0017] As a preferred technical solution of the present invention, a plurality of limiting grooves are equidistantly provided on the circumference of the docking ring, and the inner wall of the docking interface corresponds to the plurality of limiting grooves and is integrally fixedly connected with the limiting protrusions, and the limiting grooves and the limiting protrusions are matched and connected one by one.

[0018] As a preferred technical solution of the present invention, the front circumference of the outer shell is equidistantly provided with a number of air outlet holes 1 that obliquely penetrate its mounting wall, the rear circumference of the outer shell is equidistantly provided with a number of air inlet holes, and the rear circumference of the outer shell is equidistantly provided with a number of air outlet holes 2.

[0019] Beneficial effects:

[0020] 1. The limiting assembly used in the present invention can use the telescopic rod to guide the movement and limit the freedom of the static ring, the connecting ring can balance the forces on multiple springs, and the locking component can automatically lock the static ring, which can not only ensure the stable operation of the static ring but also avoid mechanical noise caused by spring displacement.

[0021] 2. The cooling assembly used in the present invention can utilize the coolant to circulate inside the mounting ring to cool the stationary ring, effectively maintaining the low temperature operation of the stationary ring and further ensuring the stable operation of the stationary ring.

[0022] 3. The static ring mechanism adopted in the present invention can effectively improve the stability of the static ring, avoid the problem of static ring instability and mechanical noise, and at the same time reduce the heat generated by the friction between the static ring and the airflow through cooling, avoid the change of the smoothness of the static ring caused by high temperature, and further ensure the stable operation of the static ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and examples.

[0024] Figure 1 It is a schematic diagram of the exploded three-dimensional structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the three-dimensional connection structure of the outer shell 1 and the outer shell 2 of the present invention.

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the static ring mechanism of the present invention.

[0027] Figure 4 It is a rear structural schematic diagram of the outer shell 2 of the present invention.

[0028] Figure 5 It is a schematic diagram of the overall connection cross-sectional structure of the present invention.

[0029] Figure 6 This invention Figure 5 Schematic diagram of the enlarged structure of area A in the middle.

[0030] Figure 7 This invention Figure 5 Schematic diagram of the enlarged structure of area B in the middle.

[0031] Figure 8 It is a schematic diagram of the cross-sectional connection structure of the connecting pipe component and the liquid-through joint of the present invention.

[0032] Figure 9 It is a rear cross-sectional structural schematic diagram of the mounting ring of the present invention.

[0033] Figure: 1, outer shell 1; 11, air outlet 1; 12, air inlet; 13, limit protrusion; 14, bolt mounting hole; 2, dynamic ring; 21, screw groove; 3, static ring mechanism; 31, limit assembly; 311, spring; 312, tightening ring; 313, connecting ring; 314, telescopic rod; 315, locking component; 3151, ring groove; 3152, embedded hole; 3153, stop groove; 3154, reducing rod ;3155, interlayer cavity; 32, static ring body; 33, mounting ring; 34, cooling assembly; 341, liquid joint; 342, bifurcated groove; 343, arc groove; 344, central groove; 345, connecting pipe component; 3451, external connecting pipe; 3452, screw cap; 3453, sealing ring; 4, outer shell II; 41, limiting groove; 42, docking ring; 43, air outlet II; 5, mounting barrel; 6, screw rotor. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0035] See Figure 1 、 Figure 3 、 Figure 6 and Figure 9 , a sealing device for a screw gas compressor, comprising a screw rotor 6, a mounting cylinder 5, an outer shell 1 and an outer shell 2 4, the front end interiors of the outer shell 1 and the outer shell 2 4 are integrally fixedly connected with a mounting wall, a static ring mechanism 3 is provided on the mounting wall, a dynamic ring 2 is provided on the front side of the static ring mechanism 3, a plurality of screw grooves 21 are equidistantly provided on the circumference of the rear side edge of the dynamic ring 2, the front and rear dynamic rings 2 are jointly fixedly connected to the mounting cylinder 5, the mounting cylinder 5 passes through the center of the outer shell 1 and the outer shell 2 4, the screw rotor 6 is fixedly connected in the mounting cylinder 5, the static ring mechanism 3 includes a static ring body 32 arranged at the rear side of the dynamic ring 2, a mounting ring 33 is fixedly connected to the rear side of the static ring body 32, a limiting component 31 for mounting the static ring body 32 on the mounting wall is provided on the rear side of the mounting ring 33, and a cooling component 34 for cooling the static ring body 32 is also provided on the rear side of the mounting ring 33.

[0036] See Figure 1 、 Figure 3 and Figure 4 The limiting assembly 31 includes a clamping ring 312 fixedly connected to the rear side of the mounting ring 33 by a plurality of bolts. A plurality of telescopic rods 314 are fixedly connected to the rear circumference of the clamping ring 312 at equal intervals. The telescopic rods 314 are double-section rods. The rear ends of the plurality of telescopic rods 314 are fixedly connected to a connecting ring 313. A spring 311 is provided on the telescopic rod 314, and a locking component 315 is provided on the rear side of the connecting ring 313.

[0037] During specific operation, the spring 311 provides the necessary pre-tightening force to ensure that there is appropriate contact pressure between the static ring body 32 and the sealing surface of the dynamic ring 2. The elastic change of the spring 311 will drive the static ring body 32 to move. The telescopic rod 314 guides the movement of the static ring body 32, limits the shaking of the static ring body 32, and improves the movement stability of the static ring body 32.

[0038] See Figure 6 and Figure 9 The cooling assembly 34 includes liquid connectors 341 that are centrally symmetrical and integrally fixed to the front side of the mounting ring 33. One group of liquid connectors 341 is used for liquid inlet, and the other group of liquid connectors 341 is used for liquid discharge. Both groups of liquid connectors 341 are provided with a connecting pipe component 345, and a cooling channel unit is provided inside the mounting ring 33.

[0039] During specific operation, the coolant is introduced through the liquid inlet joint 341, the coolant is evenly dispersed by the cooling channel unit, the heat of the static ring body 32 is carried by the flow of the coolant, and the hot coolant is discharged from the liquid discharge joint 341, thereby completing the cooling of the static ring body 32.

[0040] By cooperating with the limiting assembly 31 and the cooling assembly 34 , the stationary ring body 32 can be operated stably and with low noise.

[0041] See Figure 4 and Figure 6 The locking component 315 includes a ring groove 3151 corresponding to the position of the connecting ring 313 and opened on the front side of the mounting wall. A plurality of embedding holes 3152 are equidistantly opened on the inner circumference of the ring groove 3151. A plurality of reducing rods 3154 are equidistantly fixedly connected to the rear circumference of the connecting ring 313. The reducing rods 3154 correspond to the embedding holes 3152 one by one. An interlayer cavity 3155 is provided on the rear side of the ring groove 3151. A spacer is left between the interlayer cavity 3155 and the ring groove 3151. The embedding hole 3152 extends along the rotation direction of the dynamic ring 2 to form a stop groove 3153. The width of the stop groove 3153 is smaller than the diameter of the embedding hole 3152. The thin rod section of the reducing rod 3154 cooperates with the stop groove 3153, and the thick rod section of the reducing rod 3154 cooperates with the embedding hole 3152 and extends into the interlayer cavity 3155.

[0042] During specific operation, the static ring body 32 is quickly installed by cooperating with the embedded hole 3152 and the thick rod section of the reducing rod 3154, and the static ring body 32 is quickly locked by cooperating with the thin rod section of the reducing rod 3154 and the stop groove 3153. The distribution of the stop groove 3153 is consistent with the rotation direction of the dynamic ring 2, which can prevent the static ring body 32 from rotating out of the stop groove 3153 under the friction of the rotating airflow of the dynamic ring 2, thereby ensuring the effective fixation of the static ring body 32.

[0043] See Figure 1 and Figure 8 The pipe component 345 includes an external pipe 3451 extending to the interior of the liquid joint 341, and one end of the external pipe 3451 close to the liquid joint 341 is rotatably connected to a screw cap 3452 through a sealed bearing, and the screw cap 3452 is threadedly connected to the outer wall of the liquid joint 341. Four groups of external pipes 3451 extend to the outside of the outer shell 1 and the outer shell 2 4 through pipe holes respectively, and the pipe holes are correspondingly opened on the shell walls of the outer shell 1 and the outer shell 2 4 (the pipe holes are not shown in the figure). The two groups of external pipes 3451 on the same mounting ring 33 are respectively connected to the external coolant delivery system pipeline (the coolant delivery system is not shown in the figure); the end of the liquid joint 341 is embedded with a sealing ring 3453, and the sealing ring 3453 is in contact with the inner wall of the screw cap 3452.

[0044] During specific operation, the external pipe 3451 and the liquid connector 341 can be quickly assembled by rotating the screw cap 3452, the coolant can be transported through the coolant delivery system, and the connection between the external pipe 3451 and the liquid connector 341 can be sealed through the sealing ring 3453.

[0045] See Figure 9 The cooling channel unit includes a bifurcation groove 342 opened inside the mounting ring 33 and connected to the liquid inlet joint 341. Both sides of the bifurcation groove 342 are connected to a plurality of arc grooves 343. The arc grooves 343 on both sides of the bifurcation groove 342 are connected to a central groove 344 at one end away from the liquid inlet joint 341. The central groove 344 is connected to the liquid discharge joint 341.

[0046] During specific operation, the coolant is diverted through the bifurcated groove 342, and the coolant flowing in the arc grooves 343 cools the static ring body 32. The arc grooves 343 are evenly dispersed, which can increase the cooling area and ensure the cooling effect of the static ring body 32.

[0047] See Figure 2 、 Figure 5 and Figure 7 The end of the outer shell 2 4 close to the outer shell 1 is fixedly connected with a docking ring 42, and the diameter of the docking ring 42 is smaller than the diameter of the outer shell 2 4. The end of the outer shell 1 close to the outer shell 2 4 is provided with a docking interface that matches the outer contour of the docking ring 42; a plurality of bolt mounting holes 14 are equidistantly provided on the outer wall of the docking interface, and threaded holes are provided on the docking ring 42 corresponding to the plurality of bolt mounting holes 14 one by one, and fixing bolts are placed in the bolt mounting holes 14, and the fixing bolts are threadedly connected in the threaded holes; a plurality of limiting grooves 41 are equidistantly provided on the circumference of the docking ring 42, and the inner wall of the docking interface is fixedly connected with the limiting protrusion 13 in an integrated manner, and the limiting grooves 41 and the limiting protrusion 13 are matched and connected one by one.

[0048] During specific operation, the outer shell 1 and the outer shell 2 4 are quickly assembled by docking the interface and the docking ring 42. The limiting groove 41 and the limiting protrusion 13 cooperate to quickly position the bolt mounting hole 14 on the outer shell 1 and the threaded hole on the outer shell 2 4, and the outer shell 1 and the outer shell 2 4 are connected and fixed by fixing bolts.

[0049] See Figure 1 、 Figure 2 and Figure 5 The outer shell 1 is provided with a plurality of air outlet holes 11 equidistantly on the front circumference thereof and obliquely penetrates its mounting wall, the outer shell 1 is provided with a plurality of air inlet holes 12 equidistantly on the rear circumference thereof, and the outer shell 2 is provided with a plurality of air outlet holes 43 equidistantly on the rear circumference thereof.

[0050] During specific operation, a buffer gas of appropriate pressure (nitrogen is used as the buffer gas) is injected into the sealing cavity through the air inlet 12, which can form an environment with a slightly higher pressure than the gas pressure inside the compressor, thereby effectively preventing the compressed gas from leaking outward. The buffer gas creates a gap between the rotating dynamic ring 2 and the static ring body 32, forming an air film support, and the air film seals the sealing cavity and the compression cavity. The air outlet 11 and the air outlet 2 43 can cooperate to discharge the buffer gas to balance the pressure in the sealing cavity.

[0051] When using:

[0052] S1: First, assemble the sealing device. During the assembly process, assemble the structure of the outer shell 2 4 first. During assembly, the static ring body 32 is quickly installed by cooperating with the embedded hole 3152 and the thick rod section of the reducing rod 3154. The static ring body 32 is quickly locked by cooperating with the thin rod section of the reducing rod 3154 and the stop groove 3153. By rotating the screw cap 3452, the external pipe 3451 and the liquid joint 341 are quickly assembled, and then the dynamic ring 2 is fixed to the screw rotor 6. Then, the bolt shaft is passed through the center of the outer shell 2 4, and the dynamic ring 2 and the static column body are aligned. Then, the structure of the outer shell 1 is assembled through the above steps. After the assembly is completed, the outer shell 1 and the outer shell 2 4 are quickly assembled by docking the interface and the docking ring 42. The bolt mounting hole 14 on the outer shell 1 and the threaded hole on the outer shell 2 4 are quickly positioned by cooperating with the limiting groove 41 and the limiting protrusion 13, and the outer shell 1 and the outer shell 2 4 are connected and fixed by fixing bolts.

[0053] S2: Buffer gas of appropriate pressure is injected into the sealing cavity through the air inlet 12, and the buffer gas is discharged through the air outlet 11 and the air outlet 2 43 to balance the pressure in the sealing cavity. At the same time, coolant is introduced through the liquid inlet joint 341, and the coolant is diverted by the bifurcated groove 342. The coolant flowing in the arc grooves 343 cools the static ring body 32, and the hot coolant is discharged through the liquid discharge joint 341.

[0054] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A sealing device for a screw gas compressor, comprising a screw rotor, a mounting barrel, a first outer shell, and a second outer shell, characterized in that: The front ends of the outer shells 1 and 2 are integrally fixedly connected to the mounting wall, a static ring mechanism is provided on the mounting wall, a dynamic ring is provided on the front side of the static ring mechanism, a plurality of screw grooves are equidistantly provided on the circumference of the edge of the rear side of the dynamic ring, the front and rear dynamic rings are fixedly connected to the mounting cylinder, the mounting cylinder passes through the center of the outer shells 1 and 2, the screw rotor is fixedly connected in the mounting cylinder, the static ring mechanism includes a static ring main body provided at the rear side of the dynamic ring, a mounting ring is fixedly connected to the rear side of the static ring main body, a limiting component for mounting the static ring main body on the mounting wall is provided on the rear side of the mounting ring, and a cooling component for cooling the static ring main body is also provided on the rear side of the mounting ring; The limiting assembly includes a tightening ring fixedly connected to the rear side of the mounting ring by a plurality of bolts, a plurality of telescopic rods are fixedly connected to the rear circumference of the tightening ring at equal intervals, the telescopic rods are double-section rods, and the rear ends of the plurality of telescopic rods are fixedly connected to a connecting ring, a spring is provided on the telescopic rod, and a locking component is provided on the rear side of the connecting ring; The cooling assembly includes liquid-through joints that are centrally symmetrical and integrally fixed to the front side of the mounting ring. Both sets of liquid-through joints are provided with pipe components, and a cooling channel unit is provided inside the mounting ring. By using the limiting component and the cooling component together, the static ring body can be stable and operate with low noise; The locking component includes a ring groove corresponding to the position of the connecting ring and provided on the front side of the mounting wall, a plurality of embedded holes are provided at equal intervals on the inner circumference of the ring groove, and a plurality of reducing rods are fixedly connected at equal intervals on the rear side of the connecting ring, and the reducing rods are distributed in a one-to-one correspondence with the embedded holes; An interlayer cavity is provided on the rear side of the annular groove, with a partition left between the interlayer cavity and the annular groove. The embedded hole extends along the rotation direction of the dynamic ring to form a stop groove, the width of the stop groove is smaller than the diameter of the embedded hole, the thin rod section of the reducing rod cooperates with the stop groove, and the thick rod section of the reducing rod cooperates with the embedded hole and extends into the interlayer cavity.

2. The sealing device for a screw gas compressor according to claim 1, characterized in that: The connecting pipe component includes an external connecting pipe extending to the interior of the liquid joint. One end of the external connecting pipe close to the liquid joint is rotatably connected to a screw cap through a sealed bearing. The screw cap is threadedly connected to the outer wall of the liquid joint. Four groups of external connecting pipes extend to the outside of outer shell one and outer shell two through pipe holes respectively. The pipe holes are correspondingly opened on the shell walls of outer shell one and outer shell two. The two groups of external connecting pipes on the same mounting ring are respectively connected to the external coolant delivery system pipeline.

3. The sealing device for a screw gas compressor according to claim 2, characterized in that: A sealing ring is embedded and fixed at the end of the liquid-through joint, and the sealing ring contacts the inner wall of the screw cap.

4. The sealing device for a screw gas compressor according to claim 1, characterized in that: The cooling channel unit includes a bifurcation groove opened inside the mounting ring and connected to the liquid inlet joint. Both sides of the bifurcation groove are connected to a plurality of arc grooves. The arc grooves on both sides of the bifurcation groove are connected to a central groove at one end away from the liquid inlet joint. The central groove is connected to the liquid discharge joint.

5. The sealing device for a screw gas compressor according to claim 1, characterized in that: The end of the outer shell 2 close to the outer shell 1 is fixedly connected with a docking ring, the diameter of the docking ring is smaller than the diameter of the outer shell 2, and the end of the outer shell 1 close to the outer shell 2 is provided with a docking port that matches the outer contour of the docking ring.

6. The sealing device for a screw gas compressor according to claim 5, characterized in that: The outer wall of the docking port is equidistantly provided with a plurality of bolt mounting holes, and the docking ring is provided with threaded holes corresponding to the plurality of bolt mounting holes. Fixing bolts are placed in the bolt mounting holes, and the fixing bolts are threadedly connected in the threaded holes.

7. The sealing device for a screw gas compressor according to claim 5, characterized in that: The docking ring is provided with a plurality of limit grooves at equal intervals on its circumference, and the inner wall of the docking interface corresponds to the plurality of limit grooves and is integrally fixedly connected with the limit protrusions, and the limit grooves and the limit protrusions are matched and connected one by one.

8. The sealing device for a screw gas compressor according to claim 1, characterized in that: The front circumference of the outer shell is evenly spaced with a plurality of air outlet holes 1 that obliquely penetrate its mounting wall; the rear circumference of the outer shell is evenly spaced with a plurality of air inlet holes; the rear circumference of the outer shell is evenly spaced with a plurality of air outlet holes 2.

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