Star wheel assembly

Abstract

The utility model discloses a star wheel assembly, which is arranged on a shell of an air compressor and comprises a star wheel body and mounting structures which are respectively arranged at two ends of the star wheel body and are used for rotatably supporting the star wheel body in the shell, the star wheel body comprises a star wheel shaft and a tooth-shaped part, and the tooth-shaped part is arranged close to the first end of the star wheel shaft; the mounting structure comprises a bearing seat, a bearing and an adjusting part; the bearing seat comprises a fixed end connected with the shell and a connecting end which is integrally connected with the fixed end and extends into the shell; the adjusting part is arranged on the bearing seat in a sleeving mode and arranged between the fixed end and the outer wall of the shell. The installation structures are arranged at the two ends of the star wheel body, so that the whole structure of the star wheel assembly is simple, the number of parts is small, the bearings arranged on the bearing seats are rotationally connected with the star wheel body, and rapid installation and disassembly of the star wheel assembly are achieved; the arrangement of the adjusting part enables the star wheel body to have the effects of fine adjustment of the axial distance and sealing connection.

Description

Technical Field

[0001] The utility model relates to the technical field of single-screw air compressors, and particularly relates to a star wheel assembly. Background Art

[0002] A single-screw air compressor consists of a cylindrical screw and two symmetrically arranged planar star wheels forming a meshing pair, which is installed in the main housing. The space formed by the screw groove of the screw, the inner wall of the main housing, and the tooth surface of the star wheel constitutes the working volume of the compressor. The motor drives the screw shaft to rotate, and the screw then drives the star wheel to rotate. The gas enters the screw groove through the air inlet on the main housing and is discharged through the exhaust hole on the main housing after compression.

[0003] Chinese Utility Model Patent No. CN205401132U discloses a single-screw compressor, which includes a star wheel shaft, bearings, a star wheel shaft end cover, a star wheel inner end cover, and a star wheel outer end cover. The outer ring of the bearing is locked on the star wheel inner end cover together with an elastic member, an adjusting gasket, and the star wheel outer end cover. The prior art adjusts the axial clearance of the star wheel shaft by setting an elastic member and an adjusting gasket on the bearing. However, it not only has the defect of inconvenient assembly and disassembly due to many components, but also can only be used to adjust the axial clearance of the star wheel shaft because it is set on the bearing. Summary of the Invention

[0004] In order to overcome the above defects, the utility model provides a star wheel assembly, which has a simple structure and is convenient for quick disassembly and assembly. While meeting the requirement of adjusting the axial clearance of the star wheel shaft, it can also bear the load generated by the rotation of the star wheel body and ensure the sealing between the star wheel body and the compressor housing.

[0005] The technical solution adopted by the utility model to solve its technical problems is: to provide a star wheel assembly, which is arranged in the housing of an air compressor and includes a star wheel body and two sets of mounting structures respectively arranged at both ends of the star wheel body for rotatably supporting the star wheel body in the housing;

[0006] The star wheel body includes a star wheel shaft and a tooth-shaped part integrally formed on the star wheel shaft. The star wheel shaft has a first end and a second end, and the tooth-shaped part is arranged near the first end; each set of the mounting structures includes a bearing seat, a bearing, and an adjusting component;

[0007] The bearing seat is coaxially arranged with the star wheel shaft and includes a fixed end connected to the housing and a connecting end integrally connected to the fixed end and extending into the interior of the housing. The bearing is arranged at the connecting end and is connected to the corresponding end of the star wheel shaft; the adjusting component is sleeved on the bearing seat and is placed between the fixed end of the bearing seat and the outer wall of the housing.

[0008] As a further improvement of the present utility model, mounting portions for connecting the bearings are respectively provided on the first end and the second end of the star wheel shaft;

[0009] A star wheel disc is provided on one side of the tooth-shaped portion facing the second end, and the outer contour of the star wheel disc is slightly larger than the outer contour of the side where the star wheel disc is connected to the tooth-shaped portion.

[0010] As a further improvement of the present utility model, the bearing seat is further provided with a mounting groove and an oil delivery channel. The mounting groove is recessed at one end of the connecting end facing the star wheel shaft for mounting the bearing; the oil delivery channel is arranged along the central axis of the bearing seat and penetrates through the bearing seat, one port of which is docked with the mounting groove, and the other port is docked with an external pipeline;

[0011] A plurality of mounting holes for fixedly connecting with the outer wall of the housing are annularly arranged around the central axis on the fixed end.

[0012] As a further improvement of the present utility model, a lubricating oil buffer groove is provided on the connecting end between the oil delivery channel and the mounting groove;

[0013] The oil delivery channel has a delivery section and a pressurization section. The radial dimension of the delivery section is larger than that of the pressurization section, and the pressurization section is arranged on the side facing the lubricating oil buffer groove.

[0014] As a further improvement of the present utility model, the bearing adopts a tapered roller bearing, including:

[0015] An outer ring, which is adapted to the mounting groove;

[0016] An inner ring, which is disposed radially inside the outer ring and is adapted to the mounting portion;

[0017] Tapered rollers, a plurality of the tapered rollers are arranged at intervals in the space formed between the outer ring and the inner ring through a retainer. The tapered rollers have a large end face and a small end face, and the small end face is arranged on the side facing the lubricating oil buffer groove.

[0018] As a further improvement of the present utility model, a conical outer rolling surface for the tapered rollers to roll and contact is provided on the inner circumference of the outer ring, and a conical inner rolling surface for the tapered rollers to roll and contact is formed on the outer circumference of the inner ring. The inclination angle of the outer rolling surface relative to the bearing center is set to 13°, and the inclination angle of the inner rolling surface relative to the bearing center is set to 3°;

[0019] Both ends of the inner rolling surface protrude radially outward to form flanges for restricting the tapered rollers in the space.

[0020] As a further improvement of the present utility model, the adjusting component is a sheet-shaped annular part made of 45# steel, and assembly holes corresponding to the plurality of installation holes one by one are provided on the adjusting component.

[0021] As a further improvement of the present utility model, the radial dimension of the installation structure provided at the first end of the star wheel shaft is larger than the radial dimension of the installation structure provided at the second end of the star wheel shaft.

[0022] The beneficial effects of the present utility model are as follows: By the installation structures provided at both ends of the star wheel body, the overall structure of the star wheel assembly is simple with fewer components. The star wheel body is rotationally connected by bearings provided on the bearing seat, and the rapid installation and disassembly of the star wheel assembly are realized by using the bearing seat and the adjusting component. In addition, the setting of the adjusting component can not only improve the load-bearing capacity when the star wheel body rotates, but also realize the fine adjustment of the axial distance of the star wheel body and ensure the sealed connection between the bearing seat and the shell. Description of the Drawings

[0023] Figure 1 is a schematic structural view of the present utility model installed in a shell;

[0024] Figure 2 is the present utility model Figure 1 an enlarged schematic structural view of the red coil;

[0025] Figure 3 is a schematic structural view of the star wheel assembly of the present utility model;

[0026] Figure 4 is the present utility model Figure 3 an exploded schematic structural view;

[0027] Figure 5 is the present utility model Figure 3 a schematic sectional view.

[0028] In conjunction with the drawings, the following description is made:

[0029] 10. Shell; 11. Single screw; 20. Star wheel body; 201. Star wheel shaft; 2011. Installation part; 202. Tooth-shaped part; 203. Star wheel piece; 30. Installation structure; 301. Bearing seat; 3011. Fixed end; 30111. Installation hole; 3012. Connection end; 3013. Installation groove; 3014. Oil delivery channel; 30141. Delivery section; 30142. Pressurization section; 3015. Lubricating oil buffer tank; 302. Bearing; A. Space; 3021. Outer ring; 30211. Outer rolling surface; 3022. Inner ring; 30221. Inner rolling surface; 30222. Flange; 3023. Tapered roller; 30231. Large end face; 30232. Small end face; 303. Adjusting component; 3031. Assembly hole; 40. Pipeline. DETAILED DESCRIPTION

[0030] A preferred embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0031] See also Figures 1 to 5 The star wheel assembly provided by the present invention is arranged in the housing 10 of the air compressor. The star wheel assembly includes a star wheel body 20 and two sets of mounting structures 30 respectively arranged at both ends of the star wheel body 20 for rotatably supporting the star wheel body 20 in the housing 10. Figure 1 For reference, the star wheel assembly provided by the present invention is applied to a single-screw air compressor. The two star wheel assemblies are centrally symmetrically installed on the left and right sides of the single-screw assembly. The rotation of the single screw 11 drives the two star wheel bodies to rotate, thereby achieving the purpose of obtaining pressurized air. The principle of compressing air in a single-screw compressor is the existing technology and will not be repeated here.

[0032] See also Figure 2 and 3 The planetary wheel body 20 provided by the present invention includes a planetary wheel shaft 201 and a toothed portion 202 integrally formed on the planetary wheel shaft 201. The planetary wheel shaft 201 has a first end and a second end. The toothed portion 202 is arranged close to the first end, and the radial dimension of the first end is larger than the radial dimension of the second end to ensure the smoothness of the rotation process of the planetary wheel shaft 201 and the meshing transmission between the toothed portion 202 and the single screw. The first end and the second end of the planetary wheel shaft 201 are respectively provided with a mounting portion 2011 for connecting the bearing 302; the toothed portion 202 faces the second end. A star wheel piece 203 is provided on one side of the planetary gear body 20. The outer contour of the star wheel piece 203 is slightly larger than the outer contour of the side connected to the toothed portion 202. The star wheel piece 203 is made of polyetheretherketone material and can be fixedly connected to the toothed portion 202 through a thermoplastic process. While achieving non-rigid contact between the toothed portion 202 and the single screw, the star wheel piece 203 has excellent wear resistance and can be lubricated without oil, ensuring the meshing transmission between the toothed portion 202 on the planetary gear shaft 201 and the single screw to extend the service life of the planetary gear body 20. For ease of explanation, Figure 3 Taking the planetary wheel assembly on the left side of the single screw as a reference, the upper part of the planetary wheel shaft 201 is the second end, and the lower part is the first end. It is not difficult to understand that the radial dimensions of the upper and lower mounting structures 30 used to mount the planetary wheel shaft 201 in the compressor housing 10 also have different sizes. That is, the radial dimension of the mounting structure 30 at the first end is larger than the radial dimension of the mounting structure 30 at the second end. This ensures the axial force during the rotation of the planetary wheel body to maintain smooth rotation. It should be noted that, as Figure 1 As shown, slight differences in the bearing seats at the upper and lower ends do not affect the use of the mounting structure of the present invention and the technical effects produced.

[0033] Refer to Figures 2 to 5 , the installation structure 30 includes a bearing seat 301, a bearing 302 and an adjusting component 303. The structure is simple with fewer components. The star wheel body 20 is rotatably connected through the bearing 302 provided on the bearing seat 301, and the quick installation and disassembly of the star wheel assembly are realized by using the bearing seat 301 and the adjusting component 303. In addition, the setting of the adjusting component 303 can bear the load when the star wheel shaft rotates and ensure the sealed connection between the bearing seat and the housing.

[0034] Among them, the bearing seat 301 is coaxially arranged with the star wheel shaft 201, including a fixed end 3011 connected to the housing 10 and a connecting end 3012 integrally connected to the fixed end 3011 and extending into the housing 10. The bearing 302 is arranged on the connecting end 3012 and connected to the upper end of the star wheel shaft 20, so as to realize the rotation of the star wheel shaft around its central axis; the adjusting component 303 is sleeved on the bearing seat 301 and is placed between the fixed end 3011 of the bearing seat 301 and the outer wall of the housing 10. A plurality of mounting holes 30111 for fixedly connecting with the outer wall of the housing 10 are annularly arranged around the central axis on the fixed end 3011. The adjusting component 303 is a sheet-shaped annular part made of a material, and assembly holes 3031 corresponding to the plurality of mounting holes 30111 one by one are provided on the adjusting component 303. The bearing seat and the adjusting component are installed on the housing 10 of the compressor through fixing bolts to realize the quick disassembly of the star wheel body; in addition, the adjusting component made of a sheet-shaped annular part of 45# steel can be used to finely adjust the axial position of the star wheel shaft while ensuring the sealed connection between the bearing seat and the outer shell, so that the star wheel body meets the meshing position with the single screw.

[0035] Furthermore, the bearing seat 301 is also provided with a mounting groove 3013 and an oil delivery channel 3014. The mounting groove 3013 is recessed at one end of the connecting end 3012 facing the star wheel shaft 201 for installing the bearing 302; the oil delivery channel 3014 is arranged along the central axis of the bearing seat 301 and penetrates through the bearing seat 301. The lower port is docked with the mounting groove 3013, and the upper port is docked with the external pipeline 40. The pipeline 40 is an oil supply pipeline for the star wheel body, which is used to provide lubrication and cooling for the bearing and the tooth profile part; a lubricating oil buffer groove 3015 is provided on the connecting end 3012 between the oil delivery channel 3014 and the mounting groove 3013; the oil delivery channel 3014 has a conveying section 30141 and a pressurizing section 30142. The radial dimension of the conveying section 30141 is larger than that of the pressurizing section 30142, and the pressurizing section 30142 is arranged on the side facing the lubricating oil buffer groove 3015. Thus, the lubricating oil passes through the conveying section 30141 of the oil delivery channel 3014 through the pipeline 40 and has a certain oil pressure when passing through the pressurizing section 30142 to the lubricating oil buffer groove 3015. The rapidly flowing lubricating oil can take away the heat generated by the star wheel assembly and ensure the working stability of the compressor.

[0036] Further, considering the axial force of the star wheel shaft, the bearing provided by the present utility model is a tapered roller bearing. Refer to Figure 2 , which includes an outer ring 3021, an inner ring 3022 and tapered rollers 3023. A plurality of tapered rollers 3023 are arranged at intervals in a space A formed between the outer ring 3021 and the inner ring 3022 through a retainer (not shown in the figure). Among them, the outer ring 3021 is adapted to the mounting groove 3013; the inner ring 3022 is disposed radially inside the outer ring 3021 and is adapted to the mounting portion 2011; the tapered roller 3023 has a large end face 30231 and a small end face 30232, and the small end face 30232 is arranged toward the lubricating oil buffer groove 3015. Refer to Figure 2 and 5 , a conical outer rolling surface 30211 for the tapered roller 3023 to roll and contact is provided on the inner circumference of the outer ring 3021, and a conical inner rolling surface 30221 for the tapered roller 3023 to roll and contact is formed on the outer circumference of the inner ring 3022. The inclination angle α of the outer rolling surface 30211 relative to the bearing center is set to 13°, and the inclination angle β of the inner rolling surface 30221 relative to the bearing center is set to 3°. Thus, the axial force of the tapered roller 3023 is concentrated at the end of the central axis of the star wheel shaft 201, reducing the radial force of the star wheel shaft 201 to ensure the stable connection between the star wheel shaft and the mounting structure. At the same time, the radial force on the bearing seat is reduced, thereby ensuring the stable connection between the star wheel assembly and the housing.

[0037] Continuing to refer to Figure 2 , both ends of the inner rolling surface 30221 protrude radially outward to form a flange 30222 that confines the tapered roller 3023 within the space A. At the same time, the flanges 30222 provided on the upper and lower end faces of the inner ring 3022 also increase the contact area between the bearing 302 and the star wheel shaft 201 in the axial direction, thereby ensuring the stable connection between the bearing and the star wheel shaft.

[0038] In summary, the star wheel assembly provided by the present utility model has a simple overall structure and few components through the mounting structures provided at both ends of the star wheel body. The star wheel assembly is rotationally connected to the star wheel body through the bearing provided on the bearing seat, and the quick installation and disassembly of the star wheel assembly are realized by using the bearing seat and the adjusting component; in addition, the setting of the adjusting component can not only improve the load-bearing capacity when the star wheel body rotates, but also realize the fine adjustment of the axial distance of the star wheel body and ensure the sealed connection between the bearing seat and the housing.

[0039] In the above description, many specific details are set forth to facilitate a full understanding of the present utility model. However, the above description is only a preferred embodiment of the present utility model, and the present utility model can be implemented in many other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present utility model, or modify it into an equivalent embodiment with equivalent changes. All contents that do not depart from the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A star wheel assembly is provided in a housing (10) of an air compressor, characterized in that: It includes a star wheel body (20), and two sets of mounting structures (30) respectively provided at both ends of the star wheel body (20) for rotatably supporting the star wheel body (20) in the housing (10); The star wheel body (20) includes a star wheel shaft (201) and a tooth-shaped part (202) integrally formed on the star wheel shaft (201). The star wheel shaft (201) has a first end and a second end, and the tooth-shaped part (202) is arranged close to the first end. Each set of the mounting structures (30) includes a bearing seat (301), a bearing (302) and an adjusting component (303); The bearing seat (301) is coaxially arranged with the star wheel shaft (201), and includes a fixed end (3011) connected to the housing (10) and a connecting end (3012) integrally connected to the fixed end (3011) and extending into the housing (10). The bearing (302) is arranged at the connecting end (3012) and is connected to the corresponding end of the star wheel shaft (201). The adjusting component (303) is sleeved on the bearing seat (301) and is placed between the fixed end (3011) of the bearing seat (301) and the outer wall of the housing (10).

2. The star wheel assembly according to claim 1, wherein: Mounting parts (2011) for connecting the bearings (302) are respectively provided at the first end and the second end of the star wheel shaft (201); A star wheel piece (203) is provided on one side of the tooth-shaped part (202) facing the second end, and the outer contour of the star wheel piece (203) is slightly larger than the outer contour of the side where the star wheel piece (203) is connected to the tooth-shaped part (202).

3. The star wheel assembly according to claim 2, characterized in that: The bearing seat (301) is further provided with a mounting groove (3013) and an oil delivery channel (3014). The mounting groove (3013) is recessed at one end of the connecting end (3012) facing the star wheel shaft (201) for mounting the bearing (302). The oil delivery channel (3014) is arranged along the central axis of the bearing seat (301) and penetrates through the bearing seat (301). One port of the oil delivery channel (3014) is docked with the mounting groove (3013), and the other port is docked with an external pipeline (40); A plurality of mounting holes (30111) for fixedly connecting with the outer wall of the housing (10) are annularly arranged around the central axis on the fixed end (3011); 4. The star wheel assembly according to claim 3, characterized in that: A lubricating oil buffer groove (3015) is provided on the connecting end (3012) between the oil delivery channel (3014) and the mounting groove (3013); The oil delivery channel (3014) has a delivery section (30141) and a pressurizing section (30142). The radial dimension of the delivery section (30141) is larger than the radial dimension of the pressurizing section (30142), and the pressurizing section (30142) is arranged on one side facing the lubricating oil buffer groove (3015); 5. The star wheel assembly according to claim 4, wherein: The bearing (302) adopts a tapered roller bearing, which includes: An outer ring (3021), and the outer ring (3021) is adapted to the mounting groove (3013); Inner ring (3022), the inner ring (3022) is disposed radially inside the outer ring (3021) and is adapted to the mounting portion (2011); Tapered roller (3023), a plurality of the tapered rollers (3023) are arranged at intervals by a cage in a space (A) formed between the outer ring (3021) and the inner ring (3022), the tapered roller (3023) has a large end face (30231) and a small end face (30232), and the small end face (30232) is arranged facing the lubricating oil buffer groove (3015) side.

6. The star wheel assembly according to claim 5, wherein: A conical outer rolling surface (30211) on the inner circumference of the outer ring (3021) for the tapered roller (3023) to roll and contact, a conical inner rolling surface (30221) for the tapered roller (3023) to roll and contact is formed on the outer circumference of the inner ring (3022), and the inclination angle of the outer rolling surface (30211) relative to the bearing center is set to 13°, and the inclination angle of the inner rolling surface (30221) relative to the bearing center is set to 3°; Both ends of the inner rolling surface (30221) protrude radially outward to form a flange (30222) that confines the tapered roller (3023) within the space (A).

7. The star wheel assembly according to claim 6, characterized in that: The adjusting member (303) is a sheet-shaped annular member made of 45# steel, and the adjusting member (303) is provided with assembly holes (3031) corresponding to the plurality of mounting holes (30111) one by one.

8. The star wheel assembly according to claim 1, wherein: The radial dimension of the mounting structure (30) provided at the first end of the star wheel shaft (201) is larger than the radial dimension of the mounting structure (30) provided at the second end of the star wheel shaft (201).

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