CN217632930U

CN217632930U - Dry gas sealing device for single screw compressor

Info

Publication number: CN217632930U
Application number: CN202221769388.8U
Authority: CN
Inventors: 杨震环; 杨小平
Original assignee: Haomi Power Equipment Co ltd
Current assignee: Haomi Power Equipment Co ltd
Priority date: 2022-07-11
Filing date: 2022-07-11
Publication date: 2022-10-21
Anticipated expiration: 2032-07-11

Abstract

The utility model relates to a compressor seal field discloses a dry gas sealing device for single screw compressor, including rotating ring and quiet ring, the cover is equipped with fixed axle sleeve in the drive shaft, the rotating ring sets up and sheathes in at the fixed axle, install first sealing washer on the fixed axle sleeve, be provided with the seal cover on the casing inner wall, be provided with the elastic component on the seal cover, quiet ring slides and sets up on the seal cover, the indent has been seted up on the rotating ring, be provided with the throw-out collar on the elastic component, be provided with the second sealing washer on the throw-out collar, heat dissipation channel has been seted up in the seal cover, heat dissipation channel's one end is linked together with the cavity of putting high-pressure seal isolation gas in the casing, the other end intercommunication has the trachea, the trachea is linked together with outside air feeder equipment. This application has and can be through adopting the heat dissipation passageway, and high-pressure seal keeps apart the heat in the gaseous flow through heat dissipation passageway and take away the sealing boot, and the cooling of dispelling the heat is sent out to dry gas sealing device, reaches to improve and takes place the effect that deformation leads to dry gas sealing device's sealed effect to weaken because of the sealing washer is heated.

Description

Dry gas sealing device for single screw compressor

Technical Field

The application relates to the field of compressor sealing, in particular to a dry gas sealing device for a single-screw compressor.

Background

A screw compressor is an apparatus for compressing a gas medium, and is generally pressurized by rotating a screw, and the screw compressor is driven by a driving shaft to rotate the screw, thereby pressurizing the gas medium. Because the pressurized gas medium has higher pressure, the gas medium is easy to leak from the joint of the driving shaft and the shell at the moment, and the dry gas seal is a novel shaft end seal which uses a slotting sealing technology for gas seal, belongs to non-contact seal and has excellent sealing effect. Therefore, dry gas seals are now installed at both ends of the drive shaft of the compressor for sealing the compressor.

At present, dry gas sealing device includes rotating ring and quiet ring, and the rotating ring has the seal cover with the drive shaft fixed connection of compressor on the inner wall of casing, and quiet ring is followed drive shaft axis direction elastic mounting and is put on the seal cover, and has seted up a plurality of air inlet ducts along self direction of rotation on the lateral wall that the rotating ring is close to quiet ring. Sealing rings are arranged at the joint of the movable ring and the driving shaft and at the joint of the static ring and the sealing sleeve and used for preventing gas medium leakage, and the sealing rings are made of plastic materials. The outside air feeder of casing injects high-pressure seal isolation gas in to the casing, when the compressor function, the drive shaft drives the rotating ring and rotates, high-pressure seal isolation gas gets into in the air inlet duct, along with the high-speed rotation of rotating ring, high-pressure seal isolation gas in the air inlet duct promotes quiet ring and moves towards keeping away from the rotating ring direction on the seal cover, form one deck gas film and produce certain pressure between rotating ring and the quiet ring this moment, make rotating ring and quiet ring arrive the sealing between rotatory and non-rotating part under contactless condition, thereby seal drive shaft both ends and casing junction.

To the correlation technique among the above-mentioned, can lead to the inside temperature of casing to rise after the compressor is worked for a long time, the sealing washer of plastics material is in high temperature state for a long time and then can be heated and take place deformation for the sealed effect of sealing washer weakens, thereby makes dry gas sealing device's sealed effect weaken, and the inventor thinks that there is the defect that leads to dry gas sealing device's sealed effect to weaken because of the sealing washer is heated and takes place deformation.

SUMMERY OF THE UTILITY MODEL

In order to improve and to take place the problem that deformation leads to dry gas sealing device's sealed effect to weaken because of the sealing washer is heated, this application provides a dry gas sealing device for single screw compressor.

The application provides a dry gas sealing device for single screw compressor adopts following technical scheme:

the dry gas sealing device for the single-screw compressor comprises a moving ring and a static ring, wherein a fixed shaft sleeve is fixedly arranged on a driving shaft, the moving ring is fixedly arranged on the fixed shaft sleeve, a first sealing ring abutted to the moving ring is arranged on the fixed shaft sleeve, a sealing sleeve is fixedly arranged on the inner wall of a shell, an elastic part is arranged on the sealing sleeve, the static ring is arranged on the sealing sleeve in a sliding mode along the axis direction of the driving shaft and abutted to the moving ring, a pressure inlet groove is formed in the side wall, close to the static ring, of the moving ring, a push ring abutted to the static ring is arranged on the elastic part, a second sealing ring abutted to the static ring is arranged on the push ring, a heat dissipation channel is formed in the sealing sleeve, one end of the heat dissipation channel in the sealing sleeve is communicated with a cavity containing high-pressure sealing isolation gas in the shell, the other end of the heat dissipation channel in the sealing sleeve is communicated with an air pipe, and one end, far away from the sealing sleeve, of the air pipe is communicated with external gas supply equipment.

Through adopting above-mentioned technical scheme, when the compressor compresses gas medium, the drive shaft drives fixed axle sleeve and rotates, fixed axle sleeve drives the rotating ring and rotates, in the pressure inlet groove that rotates the high-pressure seal isolation gas in the in-process casing and get into the rotating ring, along with the high-speed rotation of rotating ring, the high-pressure seal isolation gas in the pressure inlet groove promotes quiet ring and moves towards keeping away from the rotating ring direction on the seal cover, quiet ring extrudees the elastic component through the thrust ring, when the driving force of high-pressure seal isolation gas is equal with the elastic force of elastic component, quiet ring keeps steady, form one deck air film and produce certain pressure between rotating ring and the quiet ring this moment, make rotating ring and quiet ring reach the sealed between rotatory and non-rotating part under contactless condition, thereby seal drive shaft both ends and casing junction, and first sealing washer seals fixed axle sleeve and rotating ring junction, the second sealing washer seals thrust ring and quiet ring junction, thereby make dry gas seal device's sealed effect better. When the dry gas sealing device seals two ends of a driving shaft of the compressor, high-pressure sealing isolation gas enters a heat dissipation channel of the sealing sleeve from an inner cavity of the shell, and the high-pressure sealing isolation gas flows back to external gas supply equipment from a gas pipe after passing through heat dissipation so as to be reused. So set up, high-pressure seal keeps apart the gas flow through heat dissipation channel and takes away the heat in the sealing boot, cools down the dry gas sealing device that dispels the heat for first sealing washer and second sealing washer are difficult to lead to self to take place the condition of deformation because of being in the high temperature state for a long time, thereby make dry gas sealing device's sealed effect more stable.

Preferably, a third sealing ring which is abutted against the casing is arranged on the side wall of the sealing sleeve, which is close to the casing, and a sealing channel in the sealing sleeve is positioned at a position close to the second sealing ring and the third sealing ring.

Through adopting above-mentioned technical scheme, the third sealing washer seals between seal cover and the casing inner wall for gaseous medium is difficult for leaking from the junction of seal cover and casing inner wall at compression process, thereby has further improved dry gas sealing device's sealed effect, and the heat dissipation passageway is located and is close to second sealing washer and third sealing washer, makes the heat dissipation cooling effect of heat dissipation passageway to second sealing washer and third sealing washer better.

Preferably, the heat dissipation channels are provided with a plurality of heat dissipation channels, and the heat dissipation channels are arranged in the sealing sleeve at equal intervals along the circumferential direction of the sealing sleeve.

By adopting the technical scheme, the sealing sleeves are cooled by the plurality of cooling channels, so that the cooling effect of the dry gas sealing device is improved.

Preferably, a plurality of limiting columns are arranged on the sealing sleeve along the axis direction of the driving shaft, and the stationary ring is slidably mounted on the limiting columns along the sliding direction of the stationary ring.

Through adopting above-mentioned technical scheme, when quiet ring received high-pressure seal isolation gas to promote, quiet ring slided on a plurality of spacing posts, and spacing post removes to quiet ring and carries on spacingly and make quiet ring be on a parallel with the rotating ring all the time when removing to make the air film that forms between rotating ring and the quiet ring more stable.

Preferably, fixed axle sleeve is including fixed cover and installation cover, fixed cover is fixed to be set up in the drive shaft, installation cover fixed mounting is at the tip of fixed cover, the rotating ring cover establish on fixed cover and with installation cover fixed connection, first sealing washer sets up in the installation cover, along self rotation direction seted up the radiating groove in the installation cover.

Through adopting above-mentioned technical scheme, the drive shaft rotates and drives fixed cover and rotate, fixed cover drives the installation cover and rotates, the installation cover drives the rotating ring and rotates, and first sealing washer seals installation cover and rotating ring junction, when the installation cover rotates, the installation cover drives the radiating groove of self and rotates, rotate in-process high-pressure seal isolation gas and get into the radiating groove to cool down the installation cover, make the difficult emergence deformation because of being heated of first sealing washer in the installation cover.

Preferably, the radiating grooves are formed in a plurality of intervals in the circumferential direction of the mounting sleeve.

Through adopting above-mentioned technical scheme, a plurality of radiating grooves cool down the installation cover that dispels the heat simultaneously to dry gas sealing device's radiating effect has been improved.

Preferably, one end, close to the mounting sleeve, of the fixing sleeve is provided with a fourth sealing ring abutted against the driving shaft, one end, close to the fourth sealing ring, of the mounting sleeve is provided with a heat dissipation ring hole, and the end of the heat dissipation groove is communicated with the heat dissipation ring hole.

Through adopting above-mentioned technical scheme, the fourth sealing washer seals between to drive shaft and the fixed cover for gaseous medium leaks from the difficult junction from drive shaft and fixed cover at compression process, thereby has further improved dry gas sealing device's sealed effect, and the high pressure in the radiating groove keeps apart sealed gaseous entering radiating ring downthehole, makes the radiating groove better to the heat dissipation cooling effect of fourth sealing washer.

Preferably, one end, far away from the mounting sleeve, of the fixing sleeve is fixedly provided with a limiting sleeve, and the limiting sleeve is sleeved on the fixing sleeve and is abutted against the movable ring.

Through adopting above-mentioned technical scheme, stop collar butt is on the rotating ring to carry out spacingly to the rotating ring, make the rotating ring more stable at the rotation in-process.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by adopting the heat dissipation channel, high-pressure sealing isolation gas flows through the heat dissipation channel and takes away heat in the sealing sleeve, and the dry gas sealing device is subjected to heat dissipation and cooling, so that the first sealing ring and the second sealing ring are not easy to deform due to long-time high-temperature state, and the sealing effect of the dry gas sealing device is more stable;

2. by adopting the heat dissipation groove and the heat dissipation ring hole, high-pressure sealing isolation gas enters the heat dissipation ring hole through the heat dissipation groove, so that the first sealing ring and the fourth sealing ring are further subjected to heat dissipation and cooling;

3. through adopting spacing post, spacing post removes to quiet ring and carries on spacingly and makes quiet ring be on a parallel with the rotating ring all the time when removing to make the air film that forms between rotating ring and the quiet ring more stable.

Drawings

FIG. 1 is a cross-sectional view of the dry gas seal arrangement for a single screw compressor of the present application;

FIG. 2 is a schematic structural view of a dry gas seal moving ring for a single screw compressor according to the present application;

FIG. 3 is a cross-sectional view of the dry gas seal mounting sleeve for a single screw compressor of the present application;

fig. 4 is an enlarged schematic view of fig. 1 a of the present application.

Description of reference numerals: 1. a moving ring; 2. a stationary ring; 3. fixing the shaft sleeve; 31. fixing a sleeve; 32. installing a sleeve; 4. a first seal ring; 5. sealing sleeves; 6. an elastic member; 7. a pressure inlet groove; 8. a push ring; 9. a second seal ring; 10. a heat dissipation channel; 11. an air tube; 12. a third seal ring; 13. a limiting post; 14. a heat sink; 15. a fourth seal ring; 16. a heat-dissipating ring hole; 17. a limiting sleeve; 18. a high pressure chamber; 19. an air inlet; 20. a housing; 21. a drive shaft; 22. and a protective layer.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses a dry gas sealing device for a single screw compressor.

Referring to fig. 1 and 2, the dry gas sealing device for the single screw compressor comprises a moving ring 1 and a static ring 2, wherein sealing sleeves 5 are fixedly mounted on the inner walls of two ends of a compressor shell 20, the static ring 2 is slidably mounted on the sealing sleeves 5 along the axis direction of a driving shaft 21, eight elastic pieces 6 are fixedly mounted on the sealing sleeves 5 at equal intervals along the circumferential direction of the elastic pieces, a push ring 8 is fixedly mounted at one end, far away from the sealing sleeves 5, of each elastic piece 6, and the push ring 8 is abutted to the static ring 2. The fixed cover 31 of compressor drive shaft 21's both ends is all fixed and is equipped with fixed axle sleeve 3, 1 fixed mounting of rotating ring on fixed axle sleeve 3 and with quiet ring 2 looks butt, and quiet ring 2 is located the one side that is close to compressor middle part position, and rotating ring 1 is located the one side that is close to compressor tip position, and eight arcs have been seted up along self rotation direction on rotating ring 1 is close to the lateral wall of quiet ring 2 and have been advanced the indent 7. The movable ring 1, the stationary ring 2, the sealing sleeve 5 and the fixed shaft sleeve 3, a shell of the compressor and a driving shaft 21 enclose a closed high-pressure chamber 18, an air inlet 19 communicated with the high-pressure chamber 18 is formed in a casing 20 of the compressor, and external air supply equipment injects high-pressure sealing isolation gas into the high-pressure chamber 18 through the air inlet 19. In this application, rotating ring 1 can choose to be made for tungsten carbide or carborundum, and quiet ring 2 can choose to be made for carbon graphite or carborundum, and elastic component 6 can choose to be the spring.

Outside air feeder injects high-pressure seal isolation gas into the high-pressure chamber 18 of casing 20 from inlet hole 19, when the compressor compresses the gas medium, drive shaft 21 drives fixed axle sleeve 3 and rotates, fixed axle sleeve 3 drives rotating ring 1 and rotates, high-pressure seal isolation gas in the high-pressure chamber 18 gets into in the pressure inlet groove 7 of rotating ring 1 in the rotation process, along with rotating ring 1 rotates at a high speed, high-pressure seal isolation gas in the air inlet groove promotes quiet ring 2 and moves towards keeping away from rotating ring 1 direction on seal cover 5, quiet ring 2 extrudees elastic component 6 through pushing ring 8, when high-pressure seal isolation gas's driving force and elastic component 6's elastic force are balanced, quiet ring 2 keeps steady, form the one deck air film and produce certain pressure between this moment rotating ring 1 and quiet ring 2, make rotating ring 1 and quiet ring 2 reach the seal between rotatory and the non-rotating part under the condition of contactless, thereby seal the junction of drive shaft 21 both ends and casing 20.

Referring to fig. 1, the push ring 8 is provided with a second seal ring 9 on the side wall close to the stationary ring 2, the second seal ring 9 abuts against the stationary ring 2 and the seal sleeve 5, the seal sleeve 5 is provided with a third seal ring 12 on the side wall close to the inner wall of the casing 20, and the third seal ring 12 abuts against the inner wall of the casing 20. The second sealing ring 9 and the third sealing ring 12 seal the joint of the static ring 2 and the push ring 8 and the joint of the sealing sleeve 5 and the inner wall of the casing 20, so that the sealing effect of the dry gas sealing device is further improved.

Eight heat dissipation channels 10 are arranged in the sealing sleeve 5 at equal intervals along the circumferential direction of the sealing sleeve, and the heat dissipation channels 10 in the sealing sleeve 5 are close to the second sealing ring 9 and the third sealing ring 12. The sealing sleeve 5 is provided with an air pipe 11 communicated with external air supply equipment, and two ends of the heat dissipation channel 10 are respectively communicated with the high-pressure chamber 18 and the air pipe 11. When the compressor operates, high-pressure sealing isolation gas in the high-pressure chamber 18 enters the heat dissipation channel 10, flows through the heat dissipation channel 10 and takes away heat in the sealing sleeve 5, and dissipates heat and cools the dry gas sealing device, so that the second sealing ring 9 and the third sealing ring 12 are not easy to deform due to long-time high-temperature state, and the sealing effect of the dry gas sealing device is more stable.

The fixed shaft sleeve 3 comprises a fixed sleeve 31 and a mounting sleeve 32, the fixed sleeve 31 is fixedly mounted on the driving shaft 21, the mounting sleeve 32 is mounted at one end of the fixed sleeve 31 close to the end part of the compressor, and the mounting sleeve 32 is mounted along the direction vertical to the axis of the driving shaft 21 and is integrally formed with the fixed sleeve 31. The cover is established on fixed cover 31 and is close to the lateral wall of quiet ring 2 at installation cover 32 through bolt fixed mounting to movable ring 1, fixed cover 31 is close to and installs first sealing washer 4 on the lateral wall of movable ring 1, first sealing washer 4 and movable ring 1 looks butt, install fourth sealing washer 15 on fixed cover 31 is close to the inside wall of drive shaft 21, fourth sealing washer 15 is located fixed cover 31 and is close to the one end of installation cover 32, and fourth sealing washer 15 and drive shaft 21's lateral wall looks butt, in this application, first sealing washer 4 and fourth sealing washer 15 all can be chooseed for use and make for the plastics material. The first sealing ring 4 and the fourth sealing ring 15 seal the joint of the mounting sleeve 32 of the movable ring 1 and the joint of the fixed sleeve 31 and the driving shaft 21, so that the sealing effect of the dry gas sealing device is further improved.

Referring to fig. 1 and 3, eight arc-shaped heat dissipation grooves 14 communicated with the high-pressure chamber 18 are equidistantly formed in the mounting sleeve 32 along the rotation direction of the mounting sleeve, an annular heat dissipation ring hole 16 is formed in the mounting sleeve 32 at a position close to the fourth sealing ring 15, and one ends of the eight heat dissipation grooves 14 close to the heat dissipation ring hole 16 are communicated with the heat dissipation ring hole 16. When the compressor operates, the driving shaft 21 drives the mounting sleeve 32 to rotate through the fixing sleeve 31, the mounting sleeve 32 drives eight self radiating grooves 14 to rotate, high-pressure sealing isolation gas enters the radiating grooves 14 in the rotating process, the mounting sleeve 32 and the first sealing ring 4 are cooled, high-pressure isolation sealing gas in the radiating grooves 14 enters the radiating ring hole 16, the mounting sleeve 32 and the fourth sealing ring 15 are cooled, and therefore the first sealing ring 4 and the fourth sealing ring 15 in the mounting sleeve 32 are not prone to deformation caused by heating.

Referring to fig. 1, the end of the fixed sleeve 31 far away from the mounting sleeve 32 is fixedly provided with a limiting sleeve 17 through a bolt, the limiting sleeve 17 is sleeved on the fixed sleeve 31, and one end of the limiting sleeve 17 close to the mounting sleeve 32 abuts against the side wall of the rotating ring 1. The stop collar 17 butt is on rotating ring 1 to carry out spacingly to rotating ring 1, make rotating ring 1 more stable at the rotation in-process.

Referring to fig. 4, a protective layer 22 is mounted on the side wall of the stationary ring 2 close to the moving ring 1, and in this application, the protective layer 22 may be a DLC coating. When the compressor was in just starting the state, drive shaft 21 rotational speed was lower, and the driving force that the rotating ring 1 entered the high-pressure seal isolation gas in pressure groove 7 was not enough to overcome the elastic force of elastic component 6, and rotating ring 1 butt is gone up and is rotated on quiet ring 2, and protective layer 22 on quiet ring 2 protects rotating ring 1 and quiet ring 2 this moment to reduce because of rotating ring 1 and quiet ring 2 friction lead to rotating ring 1 and the circumstances that quiet ring 2 received the damage.

Referring to fig. 1, eight limiting columns 13 are fixedly mounted on the side wall of the sealing sleeve 5 close to the stationary ring 2 at equal intervals along the circumferential direction of the sealing sleeve, the eight limiting columns 13 are mounted along the axial direction of the driving shaft 21 and penetrate through the push ring 8, and the stationary ring 2 is slidably mounted on the eight limiting columns 13 along the axial direction of the driving shaft 21 in a matched manner. When the rotating ring 1 advances the high-pressure seal in the pressure groove 7 and keeps apart gaseous promotion quiet ring 2 and remove, quiet ring 2 removes on eight are spacing, and eight spacing posts 13 move quiet ring 2 and carry on spacingly for be on a parallel with rotating ring 1 all the time when quiet ring 2 removes, thereby make the air film that forms between rotating ring 1 and the quiet ring 2 more stable.

The implementation principle of the embodiment of the application is as follows: when the compressor operates, high-pressure sealing isolation gas in the high-pressure chamber 18 enters the heat dissipation channel 10, and flows through the heat dissipation channel 10 and takes away heat in the sealing sleeve 5, so that the second sealing ring 9 and the third sealing ring 12 are not easy to deform due to long-time high-temperature state; the mounting sleeve 32 drives eight radiating grooves 14 of self to rotate, and high-pressure sealing isolation gas enters the radiating grooves 14 in the rotating process to cool the mounting sleeve 32 and the first sealing ring 4, and high-pressure sealing isolation gas in the radiating grooves 14 enters the radiating ring hole 16 to cool the mounting sleeve 32 and the fourth sealing ring 15, so that the first sealing ring 4 and the fourth sealing ring 15 in the mounting sleeve 32 are not easy to deform due to heating. The dry gas sealing device is cooled through the heat dissipation channel 10, the heat dissipation groove 14 and the heat dissipation ring hole 16, so that the sealing effect of the dry gas sealing device is more stable.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a dry gas sealing device for single screw compressor, including rotating ring (1) and quiet ring (2), fixed cover (31) is equipped with fixed axle sleeve (3) in the drive shaft, rotating ring (1) is fixed to be set up on fixed axle sleeve (3), and install on fixed axle sleeve (3) with first sealing washer (4) of rotating ring (1) looks butt, the fixed seal cover (5) that is provided with on the casing inner wall, be provided with elastic component (6) on seal cover (5), quiet ring (2) slide along drive shaft axis direction and set up on seal cover (5) and with rotating ring (1) looks butt, and rotating ring (1) have been close to and have been seted up pressure inlet groove (7) on the lateral wall of quiet ring (2), be provided with on elastic component (6) with the push ring (8) of quiet ring (2) looks butt, be provided with second sealing washer (9) with quiet ring (2) looks butt on push ring (8), its characterized in that: set up heat dissipation channel (10) in seal cover (5), the one end of heat dissipation channel (10) is linked together with the cavity of putting high-pressure seal isolation gas in the casing in seal cover (5), the other end intercommunication of heat dissipation channel (10) has trachea (11) in seal cover (5), just the one end that seal cover (5) were kept away from in trachea (11) is linked together with outside air feeder.

2. A dry gas seal arrangement for a single screw compressor according to claim 1, wherein: and a third sealing ring (12) which is abutted against the casing is arranged on the side wall of the sealing sleeve (5) close to the casing, and a sealing channel in the sealing sleeve (5) is positioned close to the second sealing ring (9) and the third sealing ring (12).

3. A dry gas seal arrangement for a single screw compressor according to claim 2, wherein: the heat dissipation channels (10) are arranged in a plurality of numbers, and the heat dissipation channels (10) are arranged in the sealing sleeve (5) at equal intervals along the circumferential direction of the sealing sleeve (5).

4. A dry gas seal arrangement for a single screw compressor as claimed in claim 1, wherein: the sealing sleeve (5) is provided with a plurality of limiting columns (13) along the axis direction of the driving shaft, and the static ring (2) is slidably mounted on the limiting columns (13) along the self-sliding direction in a matching manner.

5. A dry gas seal arrangement for a single screw compressor according to claim 1, wherein: fixed axle sleeve (3) are including fixed cover (31) and installation cover (32), fixed cover (31) are fixed to be set up in the drive shaft, installation cover (32) fixed mounting is at the tip of fixed cover (31), rotating ring (1) cover establish on fixed cover (31) and with installation cover (32) fixed connection, first sealing washer (4) set up in installation cover (32), radiating groove (14) have been seted up along self rotation direction in installation cover (32).

6. The dry gas seal arrangement for a single screw compressor according to claim 5, wherein: the heat dissipation grooves (14) are formed in a plurality of positions, and the heat dissipation grooves (14) are formed in the installation sleeve (32) at equal intervals in the circumferential direction of the installation sleeve (32).

7. A dry gas seal arrangement for a single screw compressor as claimed in claim 6, wherein: the one end that fixed cover (31) is close to installation cover (32) is provided with fourth sealing washer (15) with drive shaft looks butt, heat dissipation annular ring (16), and a plurality of have been seted up to the one end that is close to fourth sealing washer (15) in installation cover (32) the tip of radiating groove (14) all is linked together with heat dissipation annular ring (16).

8. The dry gas seal arrangement for a single screw compressor according to claim 5, wherein: the end, far away from the mounting sleeve (32), of the fixed sleeve (31) is fixedly provided with a limiting sleeve (17), and the limiting sleeve (17) is sleeved on the fixed sleeve (31) and is abutted to the movable ring (1).