CN216975244U - Screw compressor - Google Patents

Abstract

The utility model discloses a screw compressor, which comprises a compressor shell, a compression device assembled in the compressor shell, and a driving device for providing driving force for the compression device, wherein the driving device comprises a motor body assembled in the compressor shell, a rear cover fixedly arranged on the compressor shell, a driving screw shaft fixedly sleeved in a connecting sleeve of the motor body, and a supporting bearing fixedly arranged on the rear cover and corresponding to the end of the driving screw shaft and used for supporting the driving screw shaft. According to the utility model, the bearing supporting position for the driving screw shaft is added on the rear cover, so that the stability, the balance and the positioning accuracy of the structure are improved. The utility model is suitable for the screw compressor.

Description

Screw compressor

Technical Field

The utility model belongs to the technical field of screw compressors, and particularly relates to a screw compressor.

Background

The screw compressor comprises a driving device, a compression device and a shaft seal structure which are fixedly arranged in a compressor shell. The driving device comprises a motor body assembled in the compressor shell, a rear cover fixedly arranged on the compressor shell and a driving screw shaft fixedly sleeved in a motor body connecting sleeve. The compressor comprises an air inlet arranged on a compressor shell, a screw compression structure body fixedly arranged in the compressor shell and connected with a driving screw shaft of the driving device, and an exhaust bearing seat fixedly arranged on the compressor shell. During operation, gas is sucked from the air inlet of the compression device, the driving device provides driving force to drive the driving screw shaft to rotate, so that the screw of the compression structure body in the compression device is driven to rotate, the gas is compressed by the rotation of the compression structure body, and then the gas is discharged through the gas outlet of the gas discharge bearing seat, so that the processes of gas suction, compression and gas discharge are completed.

Supporting structure of driving screw shaft

In the prior art, the support structure of the screw compressor for the driving screw shaft is only arranged in the compression device, namely, the air inlet end of the driving screw shaft is supported by a roller bearing, and the air outlet end of the driving screw shaft is positioned by a thrust bearing. Relative double screw compressor's driven screw shaft, because initiative screw shaft need extend to drive arrangement in and with motor body adapter sleeve suit fixed linking to each other, initiative screw shaft length is longer, only through the bearing structure in the compressor arrangement to the supporting role of initiative screw shaft limited, has following not enough in the actual work operation:

one is poor structural stability. Under the high-speed rotation of the driving screw shaft of the compressor, because the driving device and the driving screw shaft lack support, the structural stability is poor, the driving screw shaft is easy to generate centrifugal force, the vibration of the driving screw shaft in the compressor shell is caused, and larger noise is generated.

The other is wear of parts. Due to the vibration of the driving screw in the compressor shell, the abrasion between the driving screw shaft and the connecting sleeve is increased, the abrasion between the driving screw shaft and the roller bearing and the thrust bearing in the compression device is also increased, the abrasion between the male rotor and the female rotor is also increased for the double-screw compressor, the service life of the whole equipment is greatly reduced, and the production cost is increased.

And thirdly, the positioning accuracy is low. Because the driving screw shaft lacks the stable support in the drive arrangement, influence the location precision of driving screw shaft greatly to influence two screw rod meshing precision of twin-screw compressor, can make two screw rods lock in the twin-screw compressor when serious, influence the normal operating of compressor, bring inconvenience for production work, reduce production efficiency.

Second, shaft seal structure

The compressor shaft seal structure is positioned between the compression device and the driving device and used for preventing the leakage of the lubricating oil of the bearing in the compression device so as to block the lubricating oil in the inner cavity of the compressor device. The prior art compressor shaft seal structure includes a shaft seal box, a shaft seal fitting ring thermally mounted on a driving screw shaft, and a shaft seal assembled between the shaft seal box and the shaft seal fitting ring. During the high-speed rotation of the driving screw shaft of the compressor, the shaft seal matching ring and the shaft seal are driven to rotate relatively. Along with the long-time high-speed operation of the driving screw shaft, the outer surfaces of the shaft seal inner ring and the shaft seal matching ring are abraded, so that small particles of PE (polyethylene) material solid of the shaft seal inner ring are adhered to the shaft seal matching ring, and a section of black scratch is formed on the shaft seal matching ring with higher surface smoothness. If the shaft seal continues to work at the scratch position of the shaft seal matching ring, the abrasion between the shaft seal and the shaft seal matching ring is further aggravated, the sealing performance between the shaft seal and the shaft seal matching ring is reduced, and the risk of oil leakage is increased.

In order to prevent the shaft seal from continuously generating abrasion at the scratch of the shaft seal matching ring, a mode of directly replacing the shaft seal and the shaft seal matching ring can be adopted in maintenance work. However, the shaft seal matching ring is installed on the driving screw shaft in a hot-assembling mode, and in addition, the shaft seal matching ring is small in size, lacks of a disassembly stress point and is inconvenient to disassemble and assemble under heating, so that the shaft seal matching ring is difficult to disassemble in actual work. Therefore, the shaft seal and the shaft seal matching ring are replaced by replacing a whole set of compressor equipment, the problem that the shaft seal matching ring is difficult to replace is solved, and the service life of the whole set of compressor equipment in the mode depends on the service life of the shaft seal structure. Therefore, the service life of the whole set of equipment is greatly limited, the service life of the compressor is shortened, and the enterprise cost is greatly increased.

Exhaust bearing seat of compressor

Among the prior art, the exhaust bearing frame gas vent that is located screw compressor exhaust end passes through screw and flange joint, links to each other the outside exhaust pipe with the flange again and outwards exhausts, and in this kind of connection, because the exhaust bearing frame does not directly link to each other with the exhaust pipe, there is following defect in the in-service use:

one is gas leakage. When the flange is connected with the exhaust bearing seat, the gas leakage point is increased. Even if promote the leakproofness of connection through sealed glue, wet cotton pad, still produce gaseous revealing easily to service life is limited, also is not favorable to the environmental protection.

Secondly, the operation is inconvenient. In the assembling process, the flange is required to be arranged on an exhaust port of the exhaust bearing seat, and then an exhaust pipeline is connected to the exhaust through hole of the flange. Due to the arrangement of the flange, not only are installed parts increased, but also inconvenience is brought to assembly due to limited assembly space, so that the installation efficiency is reduced, and the assembly time is prolonged.

And thirdly, the processing is inconvenient. The requirement on the machining precision of the flange parts is high, and inconvenience is brought to machining.

Fourthly, the occupied space is increased. The exhaust bearing seat is provided with the flange, so that the occupied space at the exhaust port of the exhaust bearing seat is increased, and inconvenience is brought to the installation of other parts.

SUMMERY OF THE UTILITY MODEL

In order to solve the above disadvantages in the prior art, the present invention aims to provide a screw compressor to achieve the purpose of improving the stability, balance and positioning accuracy of the structure by adding a bearing support position for the driving screw shaft on the rear cover.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: a screw compressor comprises a compressor shell, a compression device and a driving device, wherein the compression device is assembled in the compressor shell, the driving device provides driving force for the compression device, the driving device comprises a motor body assembled in the compressor shell, a rear cover fixedly installed on the compressor shell, a driving screw shaft fixedly installed in a motor body connecting sleeve, and a supporting bearing fixedly installed on the rear cover and corresponding to the end of the driving screw shaft and used for supporting the driving screw shaft.

As the limitation of the utility model, the shaft end of the driving screw shaft is arranged in any one of the following modes:

firstly, the shaft end of a driving screw shaft extends into a rear cover, and the rear cover is connected with the shaft end of the driving screw shaft through a support bearing;

and secondly, the shaft end of the driving screw shaft extends into a connecting sleeve, and the connecting sleeve is connected with the rear cover through a supporting bearing.

As a further limitation of the utility model, a wind-blocking ring is fixedly arranged on the rear cover, and the middle part of the wind-blocking ring is provided with an air inlet for leading the wind to enter the shell of the compressor.

As another limitation of the present invention, a shaft seal structure is disposed between the driving device and the compression device, the shaft seal structure includes a shaft seal box fixedly mounted on the compressor housing, a shaft seal fitting ring fixedly mounted on the driving screw shaft, a first shaft seal detachably mounted on the shaft seal box and hermetically connected to the shaft seal fitting ring, and a second shaft seal for replacing the first shaft seal, and a mounting position of the second shaft seal on the shaft seal fitting ring is staggered from a scratch position of the first shaft seal on the shaft seal fitting ring. As a further limitation of the present invention, a positioning member for axially positioning the first shaft seal or the second shaft seal is detachably connected to the shaft seal box, and a gap is formed between the positioning member and the shaft seal matching ring.

As a still further definition of the utility model, the positioning element is at least one backing ring which is axially positioned to fit between the shaft seal box end cap and the first shaft seal or which is axially positioned to fit between the shaft seal box end cap and the second shaft seal.

As another limitation of the present invention, the compressing device includes an exhaust bearing seat, and the exhaust bearing seat is provided with an exhaust port, and the exhaust port is directly and hermetically connected with the exhaust pipeline.

As a further limitation of the present invention, a flange is integrally connected to the exhaust bearing seat at the exhaust port, and an exhaust through hole for direct sealing connection with the exhaust pipe on the flange is connected to the exhaust port.

As other limitations of the utility model, an oil filling port and an oil outlet are arranged on the compressor shell, a snake-shaped oil cavity is arranged in the compressor shell, and the oil filling port is communicated with the oil outlet through the snake-shaped oil cavity.

Due to the adoption of the technical scheme, compared with the prior art, the utility model has the following beneficial effects:

(1) the utility model improves the supporting mode of the driving screw shaft in the screw compressor, and improves the original supporting position of the driving screw shaft in the compression device into the increased supporting position of the driving screw shaft in the driving device, namely, the stable and reliable support of the driving screw shaft rotating at high speed is realized by adding the supporting bearing on the rear cover, thereby effectively improving the stability and the balance of the whole structure, reducing the vibration of the driving screw shaft in the compressor shell and lowering the noise. In addition, the utility model can effectively ensure that the driving screw shaft is coaxial with the motor body connecting sleeve, improve the positioning accuracy of the driving screw shaft, reduce the abrasion among parts, prolong the service life of the whole equipment and ensure the normal operation of the compressor. Meanwhile, the utility model can have a plurality of supporting and positioning modes for the shaft end of the driving screw shaft according to the extending position of the shaft end of the driving screw shaft, thereby improving the use flexibility.

The utility model has the advantages that the wind blocking ring is arranged, the effect of blocking the wind in the compressor shell from flowing outwards from the opening of the rear cover is achieved, the wind entering the compressor shell from the outside is prevented from being mutually disordered with the wind generated by the rotation of the motor body, the wind outside the compressor shell enters the compressor shell from the opening of the rear cover through the air inlet of the wind blocking ring, and flows in the compressor shell in a single direction, so that the effect of effectively cooling the motor body is achieved.

According to the utility model, the snakelike oil cavity is arranged in the compressor shell, so that the motor body can be cooled in a way of not forming the heat dissipation holes when the quality of an external working environment is poor, and the snakelike oil cavity is snakelike to flow in an oil cooling way, so that the heat transfer area is increased, and the heat dissipation effect is improved.

(2) The utility model provides a new maintenance working mode only for replacing a shaft seal, namely, the mounting position of a second shaft seal and the mounting position of a first shaft seal are arranged in a staggered way, so that the mounting position of the second shaft seal and scratches generated by the first shaft seal on a shaft seal matching ring can be arranged in a staggered way, and the maintenance working mode has the following characteristics:

ensuring the smooth operation of maintenance work. Compared with the mode that the shaft seal matching ring cannot be replaced in the prior art, the method can ensure the normal operation of maintenance work and provide operation convenience for the maintenance work; compared with the prior art that the whole set of equipment is directly replaced, the utility model can ensure that the whole set of equipment normally operates through maintenance work, thereby greatly reducing the production cost.

And the sealing performance between the second shaft seal and the shaft seal matching ring is ensured. In the maintenance work, the replaced second shaft seal mounting position is adjusted to enable the second shaft seal to be in contact with the outer surface of the shaft seal distribution ring with higher finish degree, so that the sealing performance between the shaft seal and the shaft seal distribution ring is improved, and the oil leakage of the inner cavity of the compressor shell is effectively prevented.

The service life of the shaft seal matching ring is prolonged. Compared with the prior art, the utility model does not need to directly replace the shaft seal matching ring, prolongs the service life of the compressor and reduces the maintenance cost; the whole set of equipment does not need to be replaced, and the service life of the whole set of equipment is prolonged. Meanwhile, the service life of the compressor can be prolonged exponentially by arranging the plurality of backing rings.

And the axial positioning accuracy is improved. According to the utility model, the positioning piece is arranged to play a role in axially positioning the first shaft seal or the second shaft seal, so that the positioning accuracy of the first shaft seal or the second shaft seal is improved, and the sealing performance of the whole structure is ensured in the high-speed rotation process of the compressor.

The position of the positioning piece is flexible and adjustable. The positioning piece and the shaft seal box are detachably connected, and the positioning piece can be adjusted according to the installation positions of the first shaft seal and the second shaft seal, so that the use flexibility is improved; in addition, the inner diameter of the backing ring is smaller than that of the shaft seal box end cover, so that the backing ring can be conveniently detached from the shaft seal matching ring through the opening of the shaft seal box end cover, and the convenience of operation is improved.

(3) The utility model improves the connection mode of the exhaust bearing seat and the exhaust pipeline, namely, the exhaust pipeline is directly connected with the exhaust port of the exhaust bearing seat in a sealing way, thereby avoiding gas leakage caused between the exhaust bearing seat and the flange connection, reducing the installation steps, being convenient to operate and fast to install, and saving the occupied space at the exhaust port of the exhaust bearing seat.

The connecting mode of directly and hermetically connecting the exhaust bearing seat and the exhaust pipeline is combined with the support phase arranged in the driving device for the driving screw shaft, so that the high-quality and high-efficiency output of compressed gas of the screw compressor is effectively ensured.

The utility model is suitable for single-screw compressors or double-screw compressors.

Drawings

The utility model is described in further detail below with reference to the figures and the embodiments.

FIG. 1 is a schematic structural view (exhaust line not shown) of embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of the embodiment 2 of the utility model in which the shaft end of the driving screw extends into the rear cover;

FIG. 3 is a schematic structural diagram of a first pressing plate installed in a rear cover and extending from the shaft end of the driving screw shaft in embodiment 3 of the present invention;

fig. 4 is a schematic structural diagram of the embodiment 4 of the utility model, wherein the shaft end of the driving screw extends into the connecting sleeve.

FIG. 5 is a schematic structural view illustrating installation of a first shaft seal according to embodiment 5 of the present invention;

FIG. 6 is a schematic view of a second shaft seal according to embodiment 5 of the present invention;

FIG. 7 is a schematic structural view illustrating installation of a first shaft seal according to embodiment 6 of the present invention;

fig. 8 is a schematic structural diagram of mounting a second shaft seal according to embodiment 6 of the present invention.

Fig. 9 is a schematic structural view of a compressor housing according to embodiment 8 of the present invention;

fig. 10 is a schematic structural view of a serpentine oil chamber in a compressor housing according to embodiment 8 of the present invention.

In the figure: 1. a motor body; 2. connecting sleeves; 3. a drive screw shaft; 4. a rear cover; 5. a support bearing; 6. a first through groove; 7. a second through groove; 8. a third through groove; 9. pressing a plate; 10. a screw; 11. an end cap; 12. a wind-shield ring; 13. an air inlet; 14. a compressor housing; 15. a first screw; 16. a first presser plate; 17. a transparent plate; 115. an exhaust bearing seat; 116. an exhaust through hole; 117. a flange; 18. an oil filling port; 19. an oil outlet; 20. a partition plate; 21. a shaft seal box; 221. a first shaft seal; 222. a second shaft seal; 23. a shaft seal matching ring; 24. scratching positions; 25. a backing ring; 26. a shaft seal box end cover; 27. a serpentine oil chamber.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It is to be understood that the preferred embodiments described herein are for purposes of illustration and understanding only and are not intended to be limiting.

EXAMPLE 1A screw compressor

The screw compressor comprises a driving device, a compression device and a shaft seal structure which are assembled in a compressor shell. Compared with the existing screw compressor structure, the screw compressor structure has the advantages that the supporting position of the driving screw shaft is increased in the driving device, the structure of the exhaust bearing seat in the compression device is improved, and meanwhile, a new maintenance working mode of only replacing the shaft seal is provided. The specific structure is introduced as follows:

first, drive device

The driving device is used for providing driving force for the compressing device. The embodiment increases the support position of the driving screw shaft 3 in the compressor housing 14, namely, the driving screw shaft 3 is fixedly sleeved in the connecting sleeve 2 of the motor body 1, and the support bearing 5 is fixedly arranged at the shaft end of the driving screw shaft 3 corresponding to the rear cover 4, so that the driving screw shaft 3 rotating at a high speed is stably and reliably supported, and the stability, the balance and the positioning accuracy of the whole structure are effectively improved.

The driving device comprises a motor body 1 fixedly arranged in a compressor shell 14, a rear cover 4 fixedly connected with the compressor shell 14, a driving screw shaft 3 fixedly sleeved in a connecting sleeve 2 of the motor body 1 and a supporting bearing 5 for supporting the driving screw shaft 3. The motor body 1 comprises a motor stator fixedly arranged in the compressor shell 14 and a motor rotor matched with the motor stator, and the motor rotor is correspondingly provided with a connecting sleeve 2. The support bearing 5 is fixedly installed on the rear cover 4 corresponding to the shaft end of the driving screw shaft 3, and in this embodiment, the support positioning mode for the shaft end of the driving screw shaft 3 in embodiments 2-4 can be selected according to the extending position of the shaft end of the driving screw shaft 3.

Second, shaft seal structure

And a shaft seal structure is arranged between the driving device and the compression device and used for preventing lubricating oil of a bearing in the compression device from leaking so as to block the lubricating oil in an inner cavity of the compressor device. The embodiment provides a new maintenance operation mode only for replacing the shaft seal, namely, the installation position of the second shaft seal 222 and the installation position of the first shaft seal 221 are arranged in a staggered manner, so that the installation position of the second shaft seal 222 and the scratch generated on the shaft seal matching ring 23 by the first shaft seal 221 are arranged in a staggered manner, the maintenance operation is ensured to be normally carried out, and the service life of the shaft seal matching ring 23 is prolonged.

The present embodiment includes a shaft seal box 21 mounted on the compressor housing 14, a shaft seal fitting ring 23 thermally mounted on the drive screw shaft, and a first shaft seal 221 and a second shaft seal 222 of the same structure. The first shaft seal 221 and the second shaft seal 222 are both detachably assembled between the shaft seal box 21 and the shaft seal matching ring 23, and the first shaft seal 221 and the second shaft seal 222 are both connected with the shaft seal matching ring 23 in a sealing mode through PE materials of the inner ring. The second shaft seal 222 is used to replace the first shaft seal 221, i.e. the first shaft seal 221 and the second shaft seal 222 are not mounted on the shaft seal mating ring 23 at the same time. The mounting position of the second shaft seal 222 on the shaft seal fitting ring 23 is staggered with the mounting position of the original first shaft seal 221 on the shaft seal fitting ring 23, that is, the mounting position of the second shaft seal 222 on the shaft seal fitting ring 23 is staggered with the scratch position of the first shaft seal 221 on the shaft seal fitting ring 23, and the staggered arrangement is that the two regions on the shaft seal fitting ring do not intersect, so as to ensure that the second shaft seal 222 contacts with the surface with higher finish degree of the shaft seal fitting ring 23, and achieve the purpose of prolonging the service life of the shaft seal fitting ring 23.

In order to position the axial position of the first shaft seal 221 or the second shaft seal 222, a positioning member is detachably connected between the shaft seal box 21 and the shaft seal matching ring 23. In this embodiment, the positioning element is at least one backing ring 25, the backing ring 25 is in clearance fit with the shaft seal box 21 and has a clearance with the shaft seal matching ring 23, the backing ring 25 is axially positioned and assembled between the shaft seal box end cover 26 and the first shaft seal 221, or the backing ring 25 is axially positioned and assembled between the shaft seal box end cover 26 and the second shaft seal 222, so as to axially position the first shaft seal 221 or the second shaft seal 222 through the shaft seal box end cover 26 and the backing ring 25. Preferably, the inner diameter of the backing ring 25 is smaller than the inner diameter of the shaft seal box end cover 26, so that the backing ring 25 can be detached from the shaft seal matching ring 23 through the opening of the shaft seal box end cover 26.

The method of using the shaft seal structure of this example is shown in examples 5 to 7.

Third, the compression device

The compression device is used for realizing air suction, compression and air exhaust. The compressor comprises an air inlet arranged on a compressor shell, a screw compression structure body fixedly arranged in the compressor shell and connected with a driving screw shaft of the driving device, and an exhaust bearing seat fixedly arranged on the compressor shell.

The discharge bearing housing 115 is used to accommodate a bearing supporting the screw, and is communicated with the compressor housing, and discharges the compressed gas in the compressor housing to the outside through a discharge port.

The structure of exhaust bearing seat 115 has been improved to this embodiment, makes exhaust bearing seat 115 and exhaust pipe's connected mode change, links to each other through directly sealing exhaust pipe and gas vent promptly, has avoided the gas leakage that causes between exhaust bearing seat 115 and the flange joint, the operation of being convenient for.

Preferably, in order to facilitate connection of the exhaust pipe, as shown in fig. 1, a flange 117 is integrally connected to the exhaust bearing seat 115 at the exhaust port, an exhaust through hole 116 of the flange 117 is connected to the exhaust port in a penetrating manner, and the exhaust through hole 116 is directly connected to the exhaust pipe in a sealing manner, so as to reduce a gas leakage point. According to the user demand, the gas vent is seted up towards the bottom or towards the side.

Embodiment 2A screw compressor

In this embodiment, the shaft end of the driving screw shaft 3 extends into the rear cover 4, as shown in fig. 2, the support bearing 5 is axially positioned and assembled on the rear cover 4, and the shaft end of the driving screw shaft 3 is fixedly sleeved in the inner ring of the support bearing 5, i.e. the rear cover 4 is connected with the shaft end of the driving screw shaft 3 through the support bearing 5. In order to ensure the tightness inside the compressor housing 14, the support bearing 5 is a sealed bearing. In the high-speed rotation of the motor body 1, the motor body 1 drives the driving screw shaft 3 to rotate through the connecting sleeve 2, the shaft end of the driving screw shaft 3 and the rear cover 4 rotate relatively, and the support bearing 5 directly supports the shaft end of the driving screw shaft 3.

In order to further ensure the sealing performance inside the compressor shell 14 and facilitate the observation of the rotation condition of the driving screw shaft 3, a transparent plate 17 is fixedly arranged on the rear cover 4 corresponding to the opening at the shaft end of the driving screw shaft 3.

Preferably, as shown in fig. 2, a wind blocking ring 12 is fixedly mounted on the rear cover 4, an air inlet 13 for allowing air to enter the compressor housing 14 is formed in the middle of the wind blocking ring 12, and in this embodiment, the wind blocking ring 12 is in a circular truncated cone shape with an open top surface and an open bottom surface and is connected in a penetrating manner. During operation, air outside the compressor shell 14 enters the compressor shell 14 from the opening of the rear cover 4 through the air inlet 13 of the wind-blocking ring 12, and flows in the compressor shell 14 in a one-way mode, so that an effective cooling effect is achieved on the motor body.

EXAMPLE 3A screw compressor

In this embodiment, on the basis of the structure of embodiment 2, a first screw 15 and a first pressing plate 16 are added, as shown in fig. 3, specifically:

a first pressing plate 16 is fixedly arranged at the shaft end of the driving screw shaft 3 through a first screw 15, the first pressing plate 16 is axially positioned and clamped between the first screw 15 and the supporting bearing 5, the supporting bearing 5 is axially positioned in the rear cover 4 through a sleeve ring in the connecting sleeve 2, and the sleeve ring is axially positioned and assembled in the connecting sleeve 2.

EXAMPLE 4A screw compressor

In the embodiment, the shaft end of the driving screw shaft 3 extends into the connecting sleeve 2, as shown in fig. 4, the supporting bearing 5 is axially positioned and assembled on the connecting sleeve 2, and the protruding end of the rear cover 4 is fixedly sleeved in the inner ring of the supporting bearing 5, i.e. the connecting sleeve 2 is connected with the rear cover 4 through the supporting bearing 5. Specifically, the method comprises the following steps:

two ends of the connecting sleeve 2 in the axial direction are opened, and a first through groove 6, a second through groove 7 and a third through groove 8 which are communicated with each other are sequentially arranged. The inner diameters of the second through groove 7, the first through groove 6 and the third through groove 8 are different, and the inner diameters of the first through groove 6, the second through groove 7 and the third through groove 8 are gradually increased, namely, are in a step shape, so that axial positioning is realized. The first logical inslot 6 is fixed the cover and is equipped with the 3 axle heads of initiative screw shaft, and the 3 axle heads of initiative screw shaft are located first logical inslot 6. And a pressing plate 9 is fixedly arranged in the second through groove 7 in an axial positioning manner, and the pressing plate 9 is connected with a screw 10 at the shaft end of the driving screw shaft 3 so as to axially position the driving screw shaft 3 through the pressing plate 9. The supporting bearing 5 is axially positioned in the third through groove 8, and an end cover 11 is fixedly sealed at the opening end of the third through groove 8 so as to axially position the supporting bearing 5.

In the high-speed rotation of the screw compressor, the motor body 1 drives the driving screw shaft 3 to rotate through the connecting sleeve 2 through the pressing plate 9 and the screw 10, the connecting sleeve 2 and the rear cover 4 rotate relatively, and the supporting bearing 5 indirectly supports the shaft end of the driving screw shaft 3 through supporting the connecting sleeve 2.

EXAMPLE 5A screw compressor

Referring to fig. 5, the shaft seal box 21 and the shaft seal ring 23 are provided with the first shaft seal 221, and the first shaft seal 221 is directly installed at a position contacting the shaft seal box end cover 26 by using the axial positioning of the shaft seal box end cover 26. After a period of operation, a scored area is formed where the shaft seal ring 23 contacts the first shaft seal 221.

Referring to fig. 6, after the shaft seal matching ring 23 is scratched, the maintenance is performed in time, which specifically includes the following steps:

s1, detaching a first shaft seal 221: the first shaft seal 221 is removed from the shaft seal ring 23 and the shaft seal case 21.

S2, installing a positioning piece: a backing ring 25 is axially positioned and installed at the original installation position of the first shaft seal 21, and is arranged corresponding to the position 24 of the scratch generated on the shaft seal matching ring 23.

S3, mounting a second shaft seal 222: the second shaft seal 222 is axially positioned and installed on the shaft seal box 21 and the shaft seal matching ring 23 through the backing ring 25, and the installation position of the second shaft seal 222 is staggered with that of the first shaft seal 221, namely the second shaft seal 222 is installed at a position separated from the scratch position 24 on the shaft seal matching ring 23.

EXAMPLE 6A screw compressor

Referring to fig. 7, a backing ring 25 is mounted on the shaft seal fitting ring 223, and the first shaft seal 221 is mounted by the axial positioning of the shaft seal box end cover 26 and the backing ring 25. After a period of operation, a scored area is formed where the shaft seal ring 23 contacts the first shaft seal 221.

Referring to fig. 8, after the scratched area is formed on the shaft seal ring 23, the maintenance work specifically includes the following steps:

s1, disassembling a first shaft seal 221 and a positioning piece: the first shaft seal 221 and the backing ring 25 are detached from the shaft seal matching ring 23 and the shaft seal box 21 through the opening of the shaft seal box end cover 26.

S2, mounting a second shaft seal 222: the second shaft seal 222 is mounted on the shaft seal box 21 and the shaft seal matching ring 23 by using the axial positioning of the shaft seal box end cover 26, and the mounting position of the second shaft seal 222 is staggered with that of the first shaft seal 221, that is, the second shaft seal 222 is mounted at a position separated from the scratch position 24 on the shaft seal matching ring 23.

EXAMPLE 7A screw compressor

The difference between this embodiment and embodiment 6 is that two backing rings are installed on the shaft seal matching ring, the transverse dimension of each backing ring is matched with the transverse dimension of the first shaft seal, and the first shaft seal is installed by using the shaft seal box end cover and the axial positioning of the two backing rings. After the operation is carried out for a period of time, a scratch area is formed at the position where the shaft seal matching ring is contacted with the first shaft seal.

When the first shaft seal generates a scratch area on the shaft seal matching ring, the maintenance work specifically comprises the following steps:

s1, removing a first shaft seal and a first backing ring: and the first shaft seal and the first backing ring are dismounted from the shaft seal matching ring and the shaft seal box through the opening of the shaft seal box end cover.

S2, mounting a second shaft seal: and the second shaft seal is arranged on the shaft seal box and the shaft seal matching ring by utilizing the axial positioning of the shaft seal box end cover and the second backing ring, and the mounting positions of the second shaft seal and the first shaft seal are staggered, namely the second shaft seal is arranged at the position separated from the scratch position on the shaft seal matching ring.

After the second shaft seal generates a scratch area on the shaft seal matching ring, the second shaft seal is replaced by a third shaft seal in maintenance work, namely:

s1, removing the second shaft seal and the second backing ring.

S2, mounting a third shaft seal: and the third shaft seal is arranged on the shaft seal box and the shaft seal matching ring by utilizing the axial positioning of the shaft seal box end cover, and the mounting positions of the third shaft seal and the second shaft seal are staggered, namely the third shaft seal is arranged at the position separated from the scratch position on the shaft seal matching ring.

The relationship between the second shaft seal and the third shaft seal in this embodiment is equivalent to the relationship between the first shaft seal and the second shaft seal in embodiment 3.

EXAMPLE 8A screw compressor

In this embodiment, the structure of the compressor housing 14 is further defined on the basis of embodiment 1. As shown in fig. 9 and 10, an oil filling port 18 and an oil outlet 19 are formed in the compressor housing 14, a serpentine oil chamber 27 is formed in the compressor housing 14, and the oil filling port 18 and the oil outlet 19 are connected through the serpentine oil chamber 27. The serpentine oil cavity 27 comprises an inner cavity of the compressor shell and at least three baffle plates 20 arranged in the inner cavity at intervals, wherein the top end of one baffle plate is fixedly connected with the top surface of the inner cavity of the compressor shell, the bottom end of the one baffle plate is fixedly connected with the bottom surface of the inner cavity of the compressor shell, the top end of one baffle plate 20 in the other adjacent baffle plates 20 is fixedly connected with the top surface of the inner cavity of the compressor shell, the bottom end of the other baffle plate 20 is arranged in a clearance way with the bottom surface of the inner cavity of the compressor shell, and the top end of the other baffle plate 20 is arranged in a clearance way with the top surface of the inner cavity of the compressor shell, and the bottom end of the other baffle plate 20 is fixedly connected with the bottom surface of the inner cavity of the compressor shell, so that the serpentine oil cavity 27 entering the inner cavity of the compressor shell through the oil filling port 18 flows in a serpentine shape, namely an S-shaped flow, finally flows out of the oil outlet 19, and the cooling contact area is increased.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a screw compressor, includes compressor housing and the assembly compression device in compressor housing, for the drive arrangement that compression device provided drive power, drive arrangement is including the motor body of assembly in compressor housing, adorn back lid and the initiative screw shaft of fixed suit in motor body connects the cover admittedly on compressor housing admittedly, its characterized in that: the support bearing is fixedly arranged on the rear cover and corresponds to the end of the driving screw shaft and is used for supporting the driving screw shaft.

2. The screw compressor of claim 1, wherein: the shaft end of the driving screw shaft is arranged in any one of the following modes:

firstly, the shaft end of a driving screw shaft extends into a rear cover, and the rear cover is connected with the shaft end of the driving screw shaft through a support bearing;

and secondly, the shaft end of the driving screw shaft extends into a connecting sleeve, and the connecting sleeve is connected with the rear cover through a supporting bearing.

3. -screw compressor according to claim 2, characterised in that: the rear cover is fixedly provided with a wind-blocking ring, and the middle part of the wind-blocking ring is provided with an air inlet for leading the wind to enter the shell of the compressor.

4. A screw compressor according to any one of claims 1 to 3, wherein: the shaft seal structure is arranged between the driving device and the compression device and comprises a shaft seal box fixedly arranged on a compressor shell, a shaft seal matching ring fixedly arranged on a driving screw shaft, a first shaft seal which is detachably assembled on the shaft seal box and is in sealing connection with the shaft seal matching ring, a second shaft seal used for replacing the first shaft seal, and the mounting position of the second shaft seal on the shaft seal matching ring and the scratch position of the first shaft seal on the shaft seal matching ring are arranged in a staggered mode.

5. The screw compressor of claim 4, wherein: the shaft seal box is detachably connected with a positioning piece for axially positioning the first shaft seal or the second shaft seal, and a gap is formed between the positioning piece and the shaft seal matching ring.

6. -screw compressor according to claim 5, characterised in that: the positioning piece is at least one backing ring, and the backing ring is axially positioned and assembled between the shaft seal box end cover and the first shaft seal or the backing ring is axially positioned and assembled between the shaft seal box end cover and the second shaft seal.

7. -screw compressor according to any one of the claims 1 to 3, 5, 6, characterised in that: the compression device comprises an exhaust bearing seat, wherein an exhaust port is arranged on the exhaust bearing seat, and the exhaust port is directly connected with an exhaust pipeline in a sealing mode.

8. Screw compressor according to claim 7, characterized in that: the exhaust bearing seat at the exhaust port is integrally connected with a flange, and an exhaust through hole which is directly connected with an exhaust pipeline in a sealing manner on the flange is communicated with the exhaust port.

9. A screw compressor according to any one of claims 1 to 3, 5, 6 and 8, wherein: an oil filling port and an oil outlet are formed in the compressor shell, a snake-shaped oil cavity is formed in the compressor shell, and the oil filling port is communicated with the oil outlet through the snake-shaped oil cavity.

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