Oil-free screw main machine and all-in-one machine

Abstract

The utility model discloses an oil-free screw main machine and an all-in-one machine, the oil-free screw main machine comprises a shell, a gear box and a driving motor which are connected in sequence, the shell is provided with a rotor shaft, the driving motor is provided with an output shaft, the rotor shaft and the output shaft are both connected with the gear box, and the gear box is connected with the output shaft. The end part of the rotor shaft and the end part of the output shaft are coaxially connected in the gear box, the output shaft is sleeved with a sealing bearing, the sealing bearing is sequentially provided with a sealing ring and a dustproof cover from inside to outside, the sealing bearing is adopted to replace a conventional sealing mode of a shaft seal shaft sleeve, and the sealing bearing not only plays a role in transmission, but also plays a role in dust prevention. And meanwhile, as a sealing device, a sealing effect is achieved, installation and maintenance are convenient, and the cost is controllable.

Description

Technical Field

[0001] The present application relates to the technical field of screw devices, and more specifically to an oil-free screw main unit and an all-in-one machine. Background Art

[0002] Oil-free screw machine is an important industrial equipment, specifically including oil-free screw blower, oil-free screw compressor, etc. Oil-free screw machine is widely used in sewage treatment, cement production, chemical industry, textile and other fields. Its main structure includes drive motor, air filter, blower body, air chamber (rotor cavity), gear oil tank (one located at the intake end and the other at the exhaust end), etc. The oil-free screw machine mainly relies on the rotor in the cylinder of the air chamber to operate, so that the volume change between the blades in the rotor slot will inhale, compress and spit out the air. Since the oil-free screw machine requires an oil-free environment, there is no lubricating oil inside the rotor cavity, but the gear boxes at both ends need to be provided with lubricating oil for gear and bearing lubrication to achieve lubrication and cooling. At present, the common oil-free screw gearbox shaft seal mostly adopts a shaft seal sleeve. For example, the utility model patent with the publication number of CN202531839U discloses a shaft seal device for a screw main engine, including a sleeve, a screw main shaft is sleeved in the sleeve, and the characteristics are: a spiral line is arranged on the outer surface of the sleeve, a shaft seal skeleton is sleeved on the outer side of the sleeve, the outer end face of the shaft seal skeleton and the end cover are interference fit to form a face seal, a shaft seal lip is arranged on the inner side of the shaft seal skeleton, the lower part of the shaft seal lip is fixed on the shaft seal skeleton, the upper part of the shaft seal lip and the spiral line are tightly matched to form a meshing seal, and the spiral line is arranged on the outer surface of the sleeve at an angle of 30 degrees with the axis of the sleeve; however, friction will be generated during the actual operation of the machine and it rotates at a high speed, not only the shaft seal is very easy to wear, but also the sleeve will wear, thereby affecting the life of the main engine. On the other hand, the sleeve is mostly installed by interference embedding the main shaft, and it is difficult to disassemble once the sleeve is worn. However, if the interference amount of the sleeve is not enough, it is easy to slip, thereby causing oil leakage. Utility Model Content

[0003] The technical problem to be solved by the present application is to provide an oil-free screw main unit and an all-in-one machine. The oil-free screw main unit adopts a sealed bearing, which not only plays a transmission role, but also serves as a sealing device to achieve a sealing effect. It is easy to install and maintain and has controllable costs.

[0004] The present application provides an oil-free screw main unit, comprising a casing, a gear box and a driving motor connected in sequence, the casing is provided with a rotor shaft, the driving motor is provided with an output shaft, the rotor shaft and the output shaft are both connected to the gear box, the end of the rotor shaft and the end of the output shaft are coaxially connected in the gear box, the output shaft is provided with a sealed bearing, and the sealed bearing is provided with a sealing ring and a dust cover in sequence from the inside to the outside.

[0005] In the technical scheme, a housing, a gear box and a driving motor are arranged in sequence to form an oil-free screw main unit, which has a simple structure and is easy to install and maintain. A mutually meshing rotor group is arranged in the housing, and the rotor group is provided with a rotor shaft connected to the gear box. The driving motor is provided with an output shaft, and the rotor shaft and the output shaft are both inserted into the gear box and coaxially connected in the gear box. The driving motor acts on the gear box through the output shaft and drives the rotor group to operate through the gear box. A sealed bearing is arranged on the output shaft, and the sealed bearing can achieve the inner ring rotation and the outer ring non-rotation according to the bearing use requirements. The sealed bearing is provided with sealing rings and dust covers from the inside to the outside in sequence. The sealed bearing not only plays a transmission role, but also plays a sealing role as a sealing device. The conventional sealing method of the shaft seal sleeve is replaced by the sealed bearing to solve the wear problem caused by the sleeve and the sleeve, and can ensure the stable operation of the main unit. The sealed bearing is arranged on the output shaft, and the assembly process is simple, the manufacturing cost is low, and the maintenance is simple.

[0006] As an improvement, the gearbox is provided with a cover, and the sealed bearing is located between the cover and the output shaft. In this technical solution, the sealed bearing is installed between the cover and the output shaft, and the sealed bearing has good installation stability, simple assembly process, low manufacturing cost and simple maintenance.

[0007] As an improvement, the inner wall of the cover is provided with a mounting hole adapted to the sealed bearing, and the sealed bearing is partially accommodated in the mounting hole. In this technical solution, the sealed bearing is installed between the cover and the output shaft. By providing the mounting hole on the inner wall of the cover to accommodate part of the sealed bearing, the installation stability of the sealed bearing is improved, and the assembly process is simple, the manufacturing cost is low, and the maintenance is simple.

[0008] As an improvement, a stop ring is provided between the mounting hole and the outer ring of the sealed bearing, and the outer ring of the sealed bearing is restricted from rotating by the stop ring. In this technical solution, by providing a stop ring between the mounting hole and the outer ring of the sealed bearing, the stop ring ensures that the outer ring of the sealed bearing does not rotate and plays a sealing role at the same time.

[0009] As an improvement, the outer ring of the sealed bearing is clearance-matched with the mounting hole. In this technical solution, by setting the outer ring of the sealed bearing to be clearance-matched with the mounting hole, the stop ring is installed between the outer ring of the sealed bearing and the inner wall of the mounting hole, which has a simple assembly process, low manufacturing cost and simple maintenance.

[0010] As an improvement, the inner wall of the mounting hole is provided with a stop groove adapted to the stop ring, and the stop ring is installed in the stop groove. In this technical solution, the stop ring is installed by providing a stop groove on the inner wall of the mounting hole, thereby improving the installation stability of the stop ring, and the assembly process is simple, the manufacturing cost is low, and the maintenance is simple.

[0011] As an improvement, the inner ring of the sealed bearing is interference fit with the output shaft. In this technical solution, the sealed bearing is arranged to engage with the output shaft through the inner ring, and the inner ring of the sealed bearing is interference fit with the output shaft, thereby limiting the axial movement of the sealed bearing, so that the sealed bearing can not only play a transmission role, but also a sealing role.

[0012] As an improvement, a set of sealing rings and dust covers are arranged on both sides of the sealed bearing. In this technical solution, sealing rings and dust covers are arranged in sequence from the inside to the outside on one side of the sealed bearing, and sealing rings and dust covers are also arranged in sequence from the inside to the outside on the other side of the sealed bearing, so that the sealed bearing is connected with double-sided sealing rings and double-sided dust covers, thereby forming a double-sided contact sealed bearing, so that the sealed bearing can not only play a transmission role, but also play a sealing role.

[0013] The present application may also provide an integrated machine, including any of the aforementioned oil-free screw main units. In the present technical solution, the integrated machine includes an oil-free screw main unit using a sealed bearing, which not only plays a transmission role, but also serves as a sealing device to achieve a sealing effect, which is convenient for installation and maintenance and has controllable costs. The sealed bearing replaces the conventional sealing method of the shaft seal sleeve, solves the wear problem caused by the sleeve and the sleeve, and can ensure the stable operation of the main unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a cross-sectional schematic diagram of an oil-free screw main unit of the present application.

[0015] Figure 2 For this application Figure 1 A local enlarged schematic diagram of point A in the middle.

[0016] Figure 3 It is a cross-sectional schematic diagram of the sealed bearing in this application.

[0017] Figure 4 It is a cross-sectional schematic diagram of the cover body in this application.

[0018] Figure 5 It is a schematic diagram of the three-dimensional structure of the stop ring in this application.

[0019] As shown in the figure: 1. Shell; 11. Rotor shaft; 2. Gear box; 21. Gear; 22. Cover; 221. Mounting hole; 222. Retaining groove; 3. Driving motor; 31. Output shaft; 4. Sealed bearing; 41. Sealing ring; 42. Dust cover; 5. Retaining ring. DETAILED DESCRIPTION

[0020] In order to better understand the present application, a more detailed description of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0021] In the drawings, the thickness, size and shape of objects have been slightly exaggerated for ease of explanation. The drawings are only examples and are not drawn strictly to scale.

[0022] It should also be understood that the terms “comprises,” “including,” “has,” “contains,” and “comprising,” when used in this specification, indicate the presence of the described features, integers, steps, operations, elements, and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or combinations thereof.

[0023] like Figures 1 to 5 As shown, the present application discloses an oil-free screw main unit, including a casing 1, a gear box 2 and a driving motor 3 connected in sequence, the casing 1 is provided with a rotor shaft 11, the driving motor 3 is provided with an output shaft 31, the rotor shaft 11 and the output shaft 31 are both connected to the gear box 2, the end of the rotor shaft 11 and the end of the output shaft 31 are coaxially connected in the gear box 2, the casing 1, the gear box 2 and the driving motor 3 are arranged in sequence to form an oil-free screw main unit, which has a simple structure and is easy to install and maintain. A mutually meshing rotor group is provided in the casing 1, the rotor group is provided with a rotor shaft 11 connected to the gear box 2, the driving motor 3 is provided with an output shaft 31, a gear 21 is installed in the gear box 2, the rotor shaft 11 and the output shaft 31 are both inserted into the gear box 2 and are coaxially connected in the gear box 2, and the driving motor 3 The output shaft 31 acts on the gear box 2 and drives the rotor group to operate through the gear box 2; a sealed bearing 4 is sleeved on the output shaft 31, and a sealing ring 41 and a dust cover 42 are sequentially arranged on the sealed bearing 4 from the inside to the outside. By arranging the sealed bearing 4 on the output shaft 31, the sealed bearing 4 can achieve the inner ring rotation and the outer ring non-rotation according to the bearing use requirements. The sealed bearing 4 is sequentially arranged on the sealed ring 41 and the dust cover 42 from the inside to the outside. The sealed bearing 4 not only plays a transmission role, but also plays a sealing role as a sealing device. The conventional sealing method of the shaft seal sleeve is replaced by the sealed bearing 4 to solve the wear problem caused by the sleeve and the sleeve, and can ensure the stable operation of the main engine. The sealed bearing 4 is sleeved on the output shaft 31, and the assembly process is simple, the manufacturing cost is low, and the maintenance is simple.

[0024] More specifically, Figure 1 and Figure 2As shown, the gearbox 2 is provided with a cover body 22, and the sealed bearing 4 is located between the cover body 22 and the output shaft 31. The sealed bearing 4 is installed between the cover body 22 and the output shaft 31. The sealed bearing 4 has good installation stability, simple assembly process, low manufacturing cost and simple maintenance.

[0025] More specifically, Figure 2 As shown, the inner wall of the cover body 22 is provided with a mounting hole 221 adapted to the sealed bearing 4, and the sealed bearing 4 is partially accommodated in the mounting hole 221. The sealed bearing 4 is installed between the cover body 22 and the output shaft 31. By providing the mounting hole 221 on the inner wall of the cover body 22 to accommodate part of the sealed bearing 4, the installation stability of the sealed bearing 4 is improved, and the assembly process is simple, the manufacturing cost is low, and the maintenance is simple.

[0026] More specifically, Figure 1 , Figure 2 and Figure 5 As shown, a stop ring 5 is arranged between the mounting hole 221 and the outer ring of the sealed bearing 4, and the outer ring of the sealed bearing 4 is restricted from rotating by the stop ring 5. By arranging the stop ring 5 between the mounting hole 221 and the outer ring of the sealed bearing 4, the stop ring 5 ensures that the outer ring of the sealed bearing 4 does not rotate while playing a sealing role.

[0027] More specifically, Figure 1 and Figure 2 As shown, the outer ring of the sealed bearing 4 is clearance-fitted with the mounting hole 221. By setting the clearance-fitted between the outer ring of the sealed bearing 4 and the mounting hole 221, the stop ring 5 is installed between the outer ring of the sealed bearing 4 and the inner wall of the mounting hole 221. The assembly process is simple, the manufacturing cost is low, and the maintenance is simple.

[0028] More specifically, Figure 2 and Figure 4 As shown, the inner wall of the mounting hole 221 is provided with a retaining groove 222 adapted to the retaining ring 5, and the retaining ring 5 is installed in the retaining groove 222. By providing the retaining groove 222 on the inner wall of the mounting hole 221 to install the retaining ring 5, the installation stability of the retaining ring 5 is improved, and the assembly process is simple, the manufacturing cost is low, and the maintenance is simple.

[0029] More specifically, Figure 2 As shown, the inner ring of the sealed bearing 4 is interference fit with the output shaft 31, and the sealed bearing 4 is arranged to engage with the output shaft 31 through the inner ring, and the inner ring of the sealed bearing 4 is interference fit with the output shaft 31, thereby limiting the axial movement of the sealed bearing 4, so that the sealed bearing 4 can not only play a transmission role, but also play a sealing role.

[0030] More specifically, Figure 3As shown, a group of sealing rings 41 and dust covers 42 are arranged on both sides of the sealed bearing 4. The sealing rings 41 and dust covers 42 are arranged in sequence from the inside to the outside on one side of the sealed bearing 4, and the sealing rings 41 and dust covers 42 are also arranged in sequence from the inside to the outside on the other side of the sealed bearing 4, so that the sealed bearing 4 is connected with double-sided sealing rings 41 and double-sided dust covers 42, thereby forming a double-sided contact sealed bearing 4, so that the sealed bearing 4 can not only play a transmission role, but also play a sealing role.

[0031] like Figures 1 to 5 As shown, this embodiment can also provide an all-in-one machine based on any of the aforementioned oil-free screw main units, wherein the all-in-one machine includes an oil-free screw main unit using a sealed bearing 4, wherein the structure of the oil-free screw main unit is the same as that described above, and the sealed bearing 4 not only plays a transmission role, but also serves as a sealing device to achieve a sealing effect, which is convenient for installation and maintenance and has controllable costs. The sealed bearing 4 replaces the conventional sealing method of the shaft seal sleeve to solve the wear problem caused by the sleeve and the sleeve, and can ensure the stable operation of the main unit.

[0032] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of this application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. An oil-free screw main unit, characterized in that: The invention comprises a housing (1), a gear box (2) and a drive motor (3) which are connected in sequence, wherein the housing (1) is provided with a rotor shaft (11), the drive motor (3) is provided with an output shaft (31), the rotor shaft (11) and the output shaft (31) are both connected to the gear box (2), the end of the rotor shaft (11) and the end of the output shaft (31) are coaxially connected in the gear box (2), the output shaft (31) is sleeved with a sealed bearing (4), and the sealed bearing (4) is provided with a sealing ring (41) and a dust cover (42) in sequence from the inside to the outside.

2. The oil-free screw main unit according to claim 1, characterized in that: The gear box (2) is provided with a cover body (22), and the sealed bearing (4) is located between the cover body (22) and the output shaft (31).

3. The oil-free screw main unit according to claim 2, characterized in that: The inner wall of the cover body (22) is provided with a mounting hole (221) adapted to the sealing bearing (4), and the sealing bearing (4) is partially accommodated in the mounting hole (221).

4. The oil-free screw main unit according to claim 3, characterized in that: A stop ring (5) is provided between the mounting hole (221) and the outer ring of the sealing bearing (4), and the outer ring of the sealing bearing (4) is restricted from rotating by the stop ring (5).

5. The oil-free screw main unit according to claim 4, characterized in that: The outer ring of the sealing bearing (4) is clearance-matched with the mounting hole (221).

6. The oil-free screw main unit according to claim 4, characterized in that: The inner wall of the mounting hole (221) is provided with a retaining groove (222) adapted to the retaining ring (5), and the retaining ring (5) is mounted in the retaining groove (222).

7. The oil-free screw main unit according to claim 1, characterized in that: The inner ring of the sealed bearing (4) is interference fit with the output shaft (31).

8. The oil-free screw main unit according to claim 1, characterized in that: A group of sealing rings (41) and dust covers (42) are provided on both sides of the sealed bearing (4).

9. An all-in-one machine, characterized in that: An oil-free screw main unit comprising any one of claims 1-8.

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