CN219774348U

CN219774348U - Double-end-face mechanical seal for double-screw compressor

Info

Publication number: CN219774348U
Application number: CN202320843438.0U
Authority: CN
Inventors: 关键; 蔡昌莎; 曹云鹏; 胡益军; 邹豪; 都森欣; 陆晶妮; 裘明权
Original assignee: Lopland Machinery & Equipment Ningbo Co ltd
Current assignee: Lopland Machinery & Equipment Ningbo Co ltd
Priority date: 2023-04-11
Filing date: 2023-04-11
Publication date: 2023-09-29
Anticipated expiration: 2033-04-11

Abstract

The utility model provides a double-end-face mechanical seal for a double-screw compressor, which comprises a shaft sleeve, a first flange and a second flange, wherein the first flange and the second flange are sleeved outside the shaft sleeve, a first mounting groove is formed in the inner wall of one end, far away from the second flange, of the first flange, a main static ring is assembled in the first mounting groove, a first movable ring groove is formed in the outer part, located at one end in an inner hole of the first flange, of the shaft sleeve, a driving ring capable of sliding along the axial direction is assembled in the first movable ring groove, a first elastic compensation element is arranged between the driving ring and the bottom of the first movable ring groove, and the friction surfaces of the driving ring and the main static ring can be in relative rotary abutting joint to form the main seal; the side wall of the first flange is provided with a plurality of flushing holes which are distributed along the circumferential direction and correspond to the friction surface of the main seal. The utility model provides a double-end-face mechanical seal for a double-screw compressor, which can realize quick and efficient lubrication and cooling of a main seal and ensure the stability of sealing performance.

Description

Double-end-face mechanical seal for double-screw compressor

Technical Field

The utility model relates to the technical field of mechanical sealing, in particular to a double-end-face mechanical seal for a double-screw compressor.

Background

The double-screw compressor has a series of unique advantages of simple structure, convenient operation, reliable operation and the like, and is widely applied to various occasions such as industrial refrigeration, central air conditioning and the like. When the screw compressor is used in the refrigeration field, the refrigerants are often ammonia, freon, propane and other common refrigerants, and when the screw compressor is used as a process compressor, the media are carbon dioxide and the like, and due to different media refrigerants, the screw compressor is often required to be subjected to independent mechanical seal design according to different working conditions. In the above-mentioned case, because the medium is more gas, so the friction pair is easy to produce greater friction heat in the operation process, so it is necessary to ensure effective cooling and lubrication of the main seal grinding surface and ensure tightness.

The shaft extension seals often employ packing seals, carbon ring seals, lip seals, and mechanical seals. The double screw compressors which are mainstream in the market are mechanical sealing structures which are widely used for refrigeration or compression of process gas, and the existing mechanical sealing structures have poor heat dissipation and lubrication effects on sealing rings, so that the heat of sealing ring surfaces is easily too high to generate flatness deformation when the double screw compressors are applied to the compressor structures, and even thermal cracking occurs.

Disclosure of Invention

The utility model solves the problem of overcoming the defects in the prior art, and provides the double-end-face mechanical seal for the double-screw compressor, which can realize quick and efficient lubrication and cooling of a main seal and ensure the stability of sealing performance.

In order to solve the problems, the utility model provides a double-end-face mechanical seal for a double-screw compressor, which comprises a shaft sleeve, wherein a first flange and a second flange which are connected into a whole in an axial detachable manner are sleeved outside the shaft sleeve, a first mounting groove is formed in the inner wall of one end, far away from the second flange, of the first flange, a main stationary ring is assembled in the first mounting groove, a first movable ring groove is formed in the outer part, located at one end in an inner hole of the first flange, of the shaft sleeve, a driving ring capable of sliding in the axial direction is assembled in the first movable ring groove, a first elastic compensation element is arranged between the driving ring and the bottom of the first movable ring groove, and the friction surface of the driving ring and the friction surface of the main stationary ring can be in relative rotary abutting joint to form the main seal; and a plurality of flushing holes which are distributed along the circumferential direction and correspond to the friction surfaces of the main seal are formed in the side wall of the first flange.

Compared with the prior art, the sealing device has the following advantages:

1. through set up distributed flushing hole on first flange, improve flushing efficiency, realize two sealed faces cooling down fast to impurity particles can also be in time washed away, sealed terminal surface is avoided by the particulate matter wearing and tearing.

2. The main seal is of a dynamic ring compensation type structure, namely, the first elastic compensation element is arranged at the end of the dynamic ring and rotates along with the dynamic ring, so that better following performance between the dynamic ring and the shaft sleeve is ensured, and the sealing performance of the main seal is better ensured.

As an improvement, a second mounting groove is formed in the inner wall, close to one end of the first flange, of the second flange, an auxiliary static ring capable of sliding along the axial direction of the second mounting groove is assembled, a mounting step is formed in the outer portion of the shaft sleeve, located in the inner hole of the second flange, an auxiliary moving ring is assembled on the mounting step, friction surfaces of the auxiliary moving ring and the auxiliary static ring can be abutted against each other in a relatively rotating mode to form auxiliary sealing, and a second elastic compensation element is arranged between the auxiliary static ring and the bottom of the second mounting groove. In the improved structure, the auxiliary seal adopts a static ring compensation type, so that the synchronous rotation of the compensation element along with the shaft sleeve is avoided, and the stability of the tightness is ensured; in addition, since the secondary ring itself is mounted to the sleeve by a later stage, compensation with the secondary ring requires more axial space.

The auxiliary moving ring comprises an auxiliary moving ring body and an auxiliary moving ring seat, the auxiliary moving ring seat is matched with the outside of the mounting step in a sealing manner, a transmission screw is arranged on the side wall of the auxiliary moving ring seat in a penetrating manner, and the inner end of the transmission screw is tightly abutted to the outer wall of the shaft sleeve; an annular second movable ring groove is formed in one end, close to the auxiliary stationary ring, of the auxiliary movable ring seat, and one end, far away from the auxiliary stationary ring, of the auxiliary movable ring is hermetically assembled in the second movable ring groove. The auxiliary moving ring in the improved structure adopts a split structure, so that a transmission connection structure between the auxiliary moving ring and the shaft sleeve is more stable and firm, the installation is convenient, the grinding surface performance of the auxiliary moving ring body is not easily affected after the installation, and the sealing stability is ensured.

Still further, the second elastic compensation element comprises a plurality of second springs, a plurality of second spring holes which are uniformly distributed along the circumferential direction are formed in the bottom of the second installation groove, one end of each second spring is assembled in each second spring hole, and the other end of each second spring is abutted to one end, away from the auxiliary moving ring, of the auxiliary stationary ring. In the improved structure, the second elastic compensation element comprises a plurality of small spring structures which are uniformly distributed in the circumferential direction, and the compensation force is more uniform and stable.

And the secondary seal and the outer wall of the shaft sleeve form a secondary seal cavity, a leakage collecting hole is formed in the side wall of the second flange, and the inner end of the leakage collecting hole is communicated with the second mounting groove. In the improved structure, in case the leakage occurs at the auxiliary sealing part, liquid can not flow out to the atmosphere end rapidly, but can be recovered in a concentrated way through the leakage collecting hole, and the environment of the atmosphere end is ensured to be tidy.

The improved structure is characterized in that an isolation cavity is formed between the outer wall of the shaft sleeve and the main sealing inner wall and between the outer wall of the shaft sleeve and the auxiliary sealing outer wall, and a liquid inlet and a liquid outlet which are respectively communicated with the isolation cavity are formed in the side wall of the second flange; the first flange is close to one end of the second flange and is provided with a cavity, one end of the second flange is close to one end of the first flange and is provided with an isolation sleeve extending to the cavity, the inner end of the liquid inlet hole is positioned on the radial outer side of the isolation sleeve, and the inner end of the liquid outlet hole is positioned on the radial inner side of the isolation sleeve and corresponds to the friction surface of the auxiliary seal.

Still further, the first elastic compensation element comprises a plurality of first springs, a plurality of first spring holes which are uniformly distributed along the circumferential direction are formed in the bottom of the first movable ring groove, one end of each first spring is assembled in each spring hole, and the other end of each first spring is abutted to one end, away from the main stationary ring, of the driving ring. In the improved structure, the first elastic compensation element comprises a plurality of small spring structures which are uniformly distributed in the circumferential direction, and the compensation force is more uniform and stable.

Further improved, the outer wall of the first flange is provided with an annular inner groove, and each flushing hole is arranged in the inner groove. In the improved structure, the inner groove is arranged to enable flushing liquid entering from the compressor shell to more uniformly flush and cool the main seal through each flushing hole.

Drawings

FIG. 1 is a semi-sectional view of a double mechanical seal for a twin screw compressor according to the present utility model;

FIG. 2 is a view of another angular semi-section of a double mechanical seal for a twin screw compressor according to the present utility model;

FIG. 3 is a block diagram of a bushing in accordance with the present utility model;

FIG. 4 is an enlarged schematic view of the structure of the portion X in FIG. 1;

FIG. 5 is an enlarged schematic view of the structure at Y in FIG. 1;

fig. 6 is a schematic view of the secondary moving ring structure in the present utility model.

Reference numerals illustrate:

1. a shaft sleeve; 2. a first flange; 3. a second flange; 4. a first mounting groove; 5. a primary stationary ring; 6. a first movable ring groove; 7. a drive ring; 8. flushing the hole; 9. a second mounting groove; 10. an auxiliary stationary ring; 11. mounting steps; 12. an auxiliary moving ring body; 13. an auxiliary moving ring seat; 14. a drive screw; 15. a second movable ring groove; 16. a second spring; 17. an auxiliary seal chamber; 18. a leakage collecting hole; 19. an isolation chamber; 20. a liquid inlet hole; 21. a liquid outlet hole; 22. avoiding a cavity; 23. an isolation sleeve; 24. a first spring; 25. an inner groove; 26. a buffer channel; 27. an anti-rotation pin; 28. a drive ring; 29. a set screw; 30. flushing the inlet.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "outer wall", "inner wall", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In addition, in the description of the present utility model, the terms "first" and "second" are used for convenience of description, convenience of distinction, and are not particularly meant.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected", "fitted" and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 and 2, the present utility model provides a double-end mechanical seal for a twin-screw compressor, which comprises a shaft sleeve 1 sleeved outside a rotating shaft, that is, the shaft sleeve 1 performs synchronous rotation movement along with the rotating shaft of the compressor in the operation process of the compressor, specifically, the double-end mechanical seal is realized by arranging a corresponding driving structure between the shaft sleeve 1 and the rotating shaft, and the driving structure is described in the following.

The first flange 2 and the second flange 3 are sleeved outside the shaft sleeve 1, and the first flange 2 and the second flange 3 are detachably connected together in the axial direction, so that an integral static ring flange seat structure is formed. Specifically, a first mounting groove 4 is formed in an inner hole of one end, far away from the second flange 3, of the first flange 2, a main static ring 5 is assembled in the first mounting groove 4, a mounting boss is arranged on the outer wall of a part, located in the inner hole of the first flange 2, of the shaft sleeve 1, an annular first movable ring groove 6 is concavely formed in the end face, close to one end of the second flange 3, of the mounting boss, a driving ring 7 capable of sliding along the axial direction is assembled in the first movable ring groove 6, a first elastic compensation element is arranged between the driving ring 7 and the bottom of the first movable ring groove 6, and the friction surfaces of the driving ring 7 and the main static ring 5 can be in relatively rotatable abutting joint to form a main seal; the side wall of the first flange 2 is provided with a plurality of flushing holes 8 which are distributed along the circumferential direction and correspond to the friction surface of the main seal, and the circumferential multi-point distributed flushing holes 8 can enable the fluid flushing sealing surface to be more fully and symmetrically formed, timely take away the friction heat of the sealing ring, and avoid the influence of the deformation of the friction surface of the sealing ring caused by the excessively high friction heat; specifically, in the above structure, an annular inner groove 25 is provided on the outer wall of the first flange 2, as shown in fig. 3, each flushing hole 8 is provided in the inner groove 25, so that when the first flange 2 is installed in the inner cavity of the compressor after the arrangement, a corresponding buffer channel 26 is formed between the inner groove 25 and the inner cavity wall of the compressor, that is, after the flushing inlet 30 on the mechanically sealed flushing liquid compressor shell enters, the flushing channel 26 is uniformly filled, and then the flushing inlet is uniformly sprayed to the outer side surface of the main seal through the flushing holes 8 for flushing and cooling, so that the cooling efficiency is improved, and the flushing uniformity is ensured, as shown in fig. 1.

In the above structure, preferably, the first elastic compensation element includes a plurality of first springs 24, the bottom of the first movable ring groove 6 is provided with a plurality of first spring 24 holes uniformly distributed along the circumferential direction, one end of each first spring 24 is assembled in the spring hole, and the other end of each first spring 24 is abutted to one end of the driving ring 7, which is far away from the main stationary ring 5. The main seal in the structure is of a dynamic ring compensation type structure, namely, a compensation spring is arranged at the end of the driving ring 7 and rotates along with the driving ring 7, so that the following property between the driving ring 7 of the compensation ring and the shaft sleeve 1 is ensured, namely, the sealing performance of the main seal is better ensured.

On the other hand, in order to better ensure the stability of the connection structure between the driving ring 7 and the shaft sleeve 1 in the main sealing structure, as shown in fig. 4, an axially extending anti-rotation pin 27 is further arranged at the bottom of the first moving ring groove 6, and correspondingly, an anti-rotation pin 27 groove is formed at the tail end of the driving ring 7, and the anti-rotation pin 27 groove at the tail end of the driving ring 7 is matched with the anti-rotation pin 27 on the shaft sleeve 1 when the driving ring 7 is assembled, so that synchronous rotation movement of the driving ring 7 and the shaft sleeve 1 can be better ensured.

On the other hand, as shown in fig. 1 and 5, in this embodiment, a second mounting groove 9 is formed on the inner wall of the second flange 3 near one end of the first flange 2, and the second mounting groove 9 is provided with a secondary stationary ring 10 which can slide along the axial direction; and a mounting step 11 is arranged outside the part of the shaft sleeve 1 positioned in the inner hole of the second flange 3, an auxiliary moving ring is assembled on the mounting step 11, the friction surfaces of the auxiliary moving ring and the auxiliary stationary ring 10 can be in relatively rotating abutting joint to form auxiliary sealing, and a second elastic compensation element is arranged between the auxiliary stationary ring 10 and the bottom of the second mounting groove 9. Similarly, the second elastic compensation element in this structure includes a plurality of second springs 16, the bottom of the second installation groove 9 is provided with a plurality of second spring 16 holes uniformly distributed along the circumferential direction, one end of each second spring 16 is assembled in the second spring 16 hole, and the other end of each second spring 16 is abutted to one end of the auxiliary stationary ring 10 away from the auxiliary moving ring. In this embodiment, the auxiliary sealing portion adopts a static ring compensation type structure, that is, the compensation ring auxiliary static ring 10 is static, so that the risk of leakage caused by opening of the end surface due to low following property of the compensation ring when the linear speed is too high is avoided.

Specifically, as shown in fig. 6, the auxiliary moving ring comprises an auxiliary moving ring body 12 and an auxiliary moving ring seat 13, the auxiliary moving ring seat 13 is matched with the outside of the mounting step 11 in a sealing manner, a transmission screw 14 is arranged on the side wall of the auxiliary moving ring seat 13 in a penetrating manner, and the inner end of the transmission screw 14 is tightly abutted to the outer wall of the shaft sleeve 1 to realize the transmission connection between the auxiliary moving ring seat 13 and the shaft sleeve 1; in addition, an annular second moving ring groove 15 is formed at one end of the auxiliary moving ring seat 13, which is close to the auxiliary stationary ring 10, and one end of the auxiliary moving ring, which is far away from the auxiliary stationary ring 10, is hermetically matched in the second moving ring groove 15. In the structure, the auxiliary moving ring adopts an assembly form, wherein the auxiliary moving ring body 12 is made of silicon carbide material, and the auxiliary moving ring seat 13 is made of stainless steel metal material, so that the connection stability between the auxiliary moving ring seat 13 and the shaft sleeve 1 can be ensured; more specifically, the cross section of the auxiliary moving ring structure in the structure is of a T-shaped structure, and a sealing ring is assembled between the radial outer side of the vertical side of the auxiliary moving ring and the side wall of the radial outer end of the second moving ring groove 15, namely, the auxiliary moving ring and the auxiliary moving ring seat 13 are flexibly matched, not hard matched, so that the stress deformation of the sealing grinding surface of the auxiliary moving ring can be avoided.

As shown in fig. 1 and 5, a secondary sealing cavity 17 is formed between the outer walls of the secondary sealing shaft sleeve 1, a leakage collecting hole 18 is formed in the side wall of the second flange 3, and the inner end of the leakage collecting hole 18 is communicated with the second mounting groove 9. In this structure, once the secondary seal takes place to leak, the weeping that comes out from secondary seal mill face can collect the discharge through weeping collecting vat, avoids leaking the direct atmospheric end that flows of liquid.

In addition, as shown in fig. 1 and 2, an isolation cavity 19 is formed between the outer wall of the shaft sleeve 1 and the inner wall of the main seal and between the outer wall of the auxiliary seal, and a liquid inlet hole 20 and a liquid outlet hole 21 which are respectively communicated with the isolation cavity 19 are formed in the side wall of the second flange 3; the first flange 2 is provided with the space 22 near second flange 3 one end, and the second flange 3 is provided with the spacer sleeve 23 that extends to space 22 near first flange 2's one end, and the inner of feed liquor hole 20 is located the radial outside of spacer sleeve 23, and the inner of play liquid hole 21 is located the radial inboard of spacer sleeve 23 and the position corresponding with the friction surface of vice sealed. The position of the flushing port is specially designed in the structure, namely, the liquid outlet hole 21 is a friction surface of a direct alignment sealing surface, the liquid inlet hole 20 is arranged on the outer side of the isolation sleeve 23, namely, isolation liquid entering the isolation cavity 19 from the liquid inlet hole 20 flows in the radial direction, but flows in the axial direction better under the guiding action of the isolation sleeve 23, so that the isolation liquid can fully lubricate the main seal and the auxiliary seal, the first spring 24 at the main seal end can also play the effect of stirring the isolation liquid, the isolation liquid can cool and lubricate the inner end of the main seal better, the heat of the sealing surface is effectively reduced, and the service life of the mechanical seal is prolonged.

In this embodiment, as shown in fig. 1, in order to facilitate installation of the mechanical seal, before the mechanical seal is installed on a wall of a compressor, the first flange 2, the second flange 3, the main seal and the auxiliary seal are preassembled into an integral structure, one end of the shaft sleeve 1, which is far away from the driving ring 7, extends out of the end face of the second flange 3, a driving ring 28 is sleeved on the outer wall of the part of the shaft sleeve 1, which extends out of the second flange 3, a plurality of set screws 29 which are uniformly distributed along the circumferential direction are penetrated on the side wall of the driving ring 28, and a plurality of avoiding holes for allowing the inner ends of the set screws 29 to penetrate are formed on the side wall of the shaft sleeve 1; specifically, the whole set of mechanical seal is sleeved outside the rotating shaft of the compressor during installation, after the axial position is installed in place, the related flange structure is connected with the installation cavity of the compressor, and then the inner ends of the plurality of set screws 29 are tightly matched on the outer wall of the rotating shaft, so that the shaft sleeve 1 is in transmission connection with the rotating shaft.

Although the present disclosure is disclosed above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the disclosure.

Claims

1. The double-end-face mechanical seal for the double-screw compressor is characterized in that: the novel sealing device comprises a shaft sleeve (1), wherein a first flange (2) and a second flange (3) which are connected into a whole and are detachable along the axial direction are sleeved outside the shaft sleeve (1), a first mounting groove (4) is formed in an inner hole at one end of the first flange (2) far away from the second flange (3), a main static ring (5) is arranged in the first mounting groove (4), a first movable ring groove (6) is formed in the outer wall of the part, located in the inner hole of the first flange (2), of the shaft sleeve (1), a driving ring (7) capable of sliding along the axial direction is arranged in the first movable ring groove (6), a first elastic compensation element is arranged between the driving ring (7) and the bottom of the first movable ring groove (6), and the friction surface of the driving ring (7) and the friction surface of the main static ring (5) can be in relative rotary abutting joint so as to form a main seal; a plurality of flushing holes (8) which are distributed along the circumferential direction and correspond to the friction surface of the main seal are formed in the side wall of the first flange (2).

2. The double-ended mechanical seal for a twin-screw compressor of claim 1, wherein: the second flange (3) is close to be provided with second mounting groove (9) on the inner wall of first flange (2) one end, second mounting groove (9) are joined in marriage and are extended its axial slidable's vice quiet ring (10), axle sleeve (1) are located the outside of part in second flange (3) hole is provided with installation step (11), install vice rotating ring on installation step (11), but vice rotating's butt is in order to form vice sealedly with the friction surface of vice quiet ring (10), vice quiet ring (10) with be provided with second elasticity compensation element between second mounting groove (9) bottom.

3. The double-ended mechanical seal for a twin-screw compressor of claim 2, wherein: the auxiliary moving ring comprises an auxiliary moving ring body (12) and an auxiliary moving ring seat (13), the auxiliary moving ring seat (13) is matched with the outside of the mounting step (11) in a sealing sleeve manner, a transmission screw (14) is arranged on the side wall of the auxiliary moving ring seat (13) in a penetrating manner, and the inner end of the transmission screw (14) is tightly abutted to the outer wall of the shaft sleeve (1); an annular second movable ring groove (15) is formed in one end, close to the auxiliary stationary ring (10), of the auxiliary movable ring seat (13), and one end, far away from the auxiliary stationary ring (10), of the auxiliary movable ring is assembled in the second movable ring groove (15) in a sealing mode.

4. The double-ended mechanical seal for a twin-screw compressor of claim 2, wherein: the second elastic compensation element comprises a plurality of second springs (16), a plurality of second spring (16) holes which are uniformly distributed along the circumferential direction are formed in the bottom of the second installation groove (9), one end of each second spring (16) is assembled in each second spring (16) hole, and the other end of each second spring (16) is abutted to one end, away from the auxiliary moving ring, of the auxiliary moving ring (10).

5. The double mechanical seal for a twin screw compressor according to any one of claims 2 to 4, wherein: an auxiliary sealing cavity (17) is formed between the auxiliary seal and the outer wall of the shaft sleeve (1), a leakage collecting hole (18) is formed in the side wall of the second flange (3), and the inner end of the leakage collecting hole (18) is communicated with the second mounting groove (9).

6. The double-ended mechanical seal for a twin-screw compressor of claim 2, wherein: an isolation cavity (19) is formed between the outer wall of the shaft sleeve (1) and the main sealing inner wall and between the outer wall of the shaft sleeve and the auxiliary sealing outer wall, and a liquid inlet hole (20) and a liquid outlet hole (21) which are respectively communicated with the isolation cavity (19) are formed in the side wall of the second flange (3); the novel sealing device is characterized in that a cavity (22) is formed in one end, close to the second flange (3), of the first flange (2), an isolation sleeve (23) extending to the cavity (22) is arranged at one end, close to the first flange (2), of the second flange (3), the inner end of the liquid inlet hole (20) is located on the radial outer side of the isolation sleeve (23), and the inner end of the liquid outlet hole (21) is located on the radial inner side of the isolation sleeve (23) and at a position corresponding to the friction surface of the auxiliary seal.

7. The double-ended mechanical seal for a twin-screw compressor of claim 1, wherein: the first elastic compensation element comprises a plurality of first springs (24), a plurality of first spring (24) holes uniformly distributed along the circumferential direction are formed in the bottom of the first movable ring groove (6), one end of each first spring (24) is assembled in each first spring (24) hole, and the other end of each first spring (24) is abutted to one end, away from the main stationary ring (5), of the driving ring (7).

8. The double-ended mechanical seal for a twin-screw compressor of claim 1, wherein: an annular inner groove (25) is formed in the outer wall of the first flange (2), and each flushing hole (8) is formed in the inner groove (25).