Tool for adjusting axial clearance of rotor of screw compressor

Abstract

The utility model provides a screw compressor rotor axial clearance adjusting tool, which comprises an inner adjusting pad, an outer adjusting pad and a detachable process shaft sleeve, a screw compressor rotor comprises a male rotor and a female rotor, the exhaust end of the rotor is arranged in an inner hole of an exhaust end seat through a bearing bush, a cylindrical roller bearing is sleeved on a rotor shaft shoulder, and the outer adjusting pad is sleeved on the outer adjusting pad. The outer ring of the cylindrical roller bearing is mounted close to the bearing bush, the inner adjusting pad is sleeved on the rotor shaft close to the inner ring of the cylindrical roller bearing, the outer adjusting pad is mounted close to the outer ring of the cylindrical roller bearing, and the pair of angular contact ball bearings is sleeved on the rotor shaft face to face; the specification of the process shaft sleeve is matched with that of the angular contact ball bearing; before assembly, the angular contact ball bearing is replaced by the process shaft sleeve, and the process shaft sleeve is in contact with the inner adjusting pad and the outer adjusting pad; under the normal use condition, the angular contact ball bearing is in contact with the inner adjusting pad and the outer adjusting pad. The axial exhaust end gap of the double rotors of the screw compressor can be conveniently adjusted to meet the design requirement through the inner adjusting pad and the outer adjusting pad.

Description

Technical Field

[0001] This utility model relates to the field of screw compressor assembly technology, and in particular to a screw compressor rotor axial clearance adjustment tool. Background Technology

[0002] In a twin-screw refrigeration compressor, the male and female rotors rotate in opposite directions within a cavity formed by the compressor's suction end seat, housing, and discharge end seat. A meshing backlash exists between the male and female rotors, and their two end faces maintain suction and discharge clearances with the suction and discharge end seats, respectively. During compressor assembly, the axial discharge clearance of the rotors is subject to strict requirements. If the axial discharge clearance is too large, the discharge volume at the same pressure will decrease, reducing compressor performance and increasing energy consumption. If the axial discharge clearance is too small, thermal expansion and contraction can easily cause friction between the rotor end face and the discharge end seat, resulting in damage to the main unit and rotor end faces. Therefore, adjusting and controlling the compressor rotor axial clearance is an important aspect of compressor assembly and maintenance. To limit the axial position of the male and female rotors of the compressor, the existing technology will set a pair of angular contact ball bearings on the rotor shaft of the male and female rotors to bear the axial load. The inner ring of the angular contact ball bearing is interference-fitted with the rotor shaft, while the outer ring of the bearing can be clearance-fitted with the exhaust end seat, so that one side of the inner ring of the bearing indirectly abuts against the shoulder of the rotor shaft, and a lock nut is tightened on the other side of the bearing to press the lock nut against the other side of the inner ring of the bearing, thereby achieving axial positioning of the bearing and the rotor shaft.

[0003] In the existing technology, angular contact ball bearings are used. Because the inner ring of the bearing is interference-fitted with the rotor shaft, it is difficult to disassemble and assemble the bearing when adjusting the axial exhaust clearance, which seriously takes up maintenance time. Utility Model Content

[0004] To address the aforementioned technical problems, a screw compressor rotor axial clearance adjustment tool is provided. The technical means employed in this invention are as follows:

[0005] A screw compressor rotor axial clearance adjustment tool includes an inner adjusting shim, an outer adjusting shim, and a detachable process bushing. The screw compressor rotor includes a male rotor and a female rotor. The exhaust end of the rotor is mounted in the inner hole of the exhaust end seat via a bearing bush. A cylindrical roller bearing is fitted onto the rotor shaft shoulder, with the outer ring of the cylindrical roller bearing mounted against the bearing bush. The inner adjusting shim is fitted onto the rotor shaft close to the inner ring of the cylindrical roller bearing, and the outer adjusting shim is fitted onto the outer ring of the cylindrical roller bearing. A pair of angular contact ball bearings are fitted face-to-face onto the rotor shaft. The specifications of the process bushing match those of the angular contact ball bearings. Before assembly, the angular contact ball bearings are replaced with the process bushing, and the process bushing contacts the inner and outer adjusting shims. Under normal use, the angular contact ball bearings contact the inner and outer adjusting shims.

[0006] Furthermore, the angular contact ball bearing of the male rotor is fastened by a retaining washer and a round nut. The shaft seal sleeve is installed in the exhaust end seat of the male rotor. A disc spring is installed on the outside of the shaft seal sleeve, and the other end contacts the angular contact ball bearing near the exhaust end. The shaft seal cover is installed on the exhaust end seat of the male rotor by an internal hex nut. The disc spring and shaft seal sleeve provide preload force to the outer ring of the angular contact ball bearing.

[0007] Furthermore, the bearing sleeve is installed in the exhaust end seat of the female rotor, a disc spring is installed on the outside of the bearing sleeve, and the other end contacts the angular contact ball bearing near the exhaust end. The bearing end cover is installed on the exhaust end seat of the female rotor by means of an internal hex nut, and the bearing cover presses the inner ring of the angular contact ball bearing onto the female rotor shaft by means of an internal hex nut.

[0008] Furthermore, the dimensions of the inner and outer adjusting shims are adjusted based on the axial exhaust clearance dimensions measured by a dial indicator before assembly.

[0009] This utility model has the following advantages: The screw compressor rotor axial clearance adjustment tool provided by this utility model can easily adjust the axial discharge end clearance of the twin rotors of the screw compressor to the design requirements through inner and outer adjusting shims. Furthermore, the use of process bushings with a hole-shaft clearance fit facilitates the adjustment of the axial discharge end clearance during the production and maintenance of screw compressors. During the production or maintenance assembly of twin-screw refrigeration compressors, two process bushings replace a pair of angular contact ball bearings at the discharge ends of the male and female rotors to adjust the rotor axial discharge clearance, greatly facilitating the adjustment and positioning work and avoiding the problem of difficult disassembly and assembly due to the interference fit between the bearing inner ring and the rotor shaft. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of this utility model before assembly.

[0012] Figure 2 This is a schematic diagram of the structure of this utility model under normal use.

[0013] Figure 3 This is a schematic diagram for troubleshooting excessive rotor exhaust clearance in this utility model.

[0014] Figure 4 This is a schematic diagram for troubleshooting when the rotor exhaust clearance of this utility model is too small.

[0015] In the diagram: 1. Female rotor; 2. Male rotor; 3. Exhaust end seat; 4. Bearing bush; 5. Cylindrical roller bearing; 6. Inner adjusting shim; 7. Outer adjusting shim; 8. Angular contact ball bearing; 9. Locking washer; 10. Round nut; 11. Shaft seal sleeve; 12. Disc spring; 13. Socket head cap nut; 14. Process bushing; 15. Shaft seal cover; 16. Bearing end cover; 17. Bearing sleeve; 18. Socket head cap nut; 19. Bearing cover. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] like Figures 1-4 As shown, this utility model discloses a screw compressor rotor axial clearance adjustment tool, including an inner adjusting shim, an outer adjusting shim, and a detachable process bushing. The screw compressor rotor includes a male rotor 2 and a female rotor 1.

[0018] Before the angular contact ball bearing is installed, the male rotor 2 and female rotor 1 have the same installation structure and method, namely: the exhaust end of the rotor is pressed into the inner hole of the exhaust end seat 3 by a bearing bush; a cylindrical roller bearing 5 is sleeved on the rotor shaft shoulder; the outer ring of the cylindrical roller bearing is installed against the bearing bush 4; and the inner ring of the cylindrical roller bearing 5 is heated and fitted onto the shoulder of the male rotor 2. The inner adjusting shim 6 is fitted onto the rotor shaft close to the inner ring of the cylindrical roller bearing; the outer adjusting shim 7 is fitted onto the outer ring of the cylindrical roller bearing; and a pair of angular contact ball bearings 8 are fitted onto the rotor shaft face to face. The specifications of the process bushing 14 match the angular contact ball bearing. Before assembly, the process bushing replaces the angular contact ball bearing, and the process bushing contacts the inner and outer adjusting shims. Under normal use, the angular contact ball bearing contacts the inner and outer adjusting shims.

[0019] To adjust the axial exhaust clearance of the rotor, this embodiment uses a method of changing the thickness of the adjusting shims between the inner and outer rings of the bearing. A process bushing is used, with its inner diameter clearance-fitted to the rotor shaft and its outer diameter clearance-fitted to the exhaust end bearing hole. This bushing replaces a pair of angular contact ball bearings when adjusting the axial exhaust clearance, avoiding the problem of difficult disassembly and assembly due to the interference fit between the bearing inner ring and the rotor shaft.

[0020] The process bushings for the male and female rotors are set according to the specifications of the male and female rotors.

[0021] In the rear section of the angular contact ball bearing installation, the mounting structure and installation method of the male rotor 2 and the female rotor 1 differ, namely:

[0022] The angular contact ball bearing of the male rotor is fastened by a retaining washer 9 and a round nut 10. The shaft seal sleeve 11 is installed in the exhaust end seat of the male rotor. A disc spring 12 is installed on the outside of the shaft seal sleeve, and the other end contacts the angular contact ball bearing near the exhaust end. The shaft seal cover 15 is installed on the exhaust end seat of the male rotor by an internal hex nut 13. The disc spring and the shaft seal sleeve provide preload force to the outer ring of the angular contact ball bearing.

[0023] The bearing sleeve 17 is installed in the exhaust end seat of the female rotor. A disc spring is installed on the outside of the bearing sleeve, and the other end contacts the angular contact ball bearing near the exhaust end. The bearing end cover 16 is installed on the exhaust end seat of the female rotor by means of the internal hex nut 18. The bearing cover 19 presses the inner ring of the angular contact ball bearing onto the female rotor shaft by means of the internal hex nut.

[0024] The dimensions of the inner and outer adjusting shims are adjusted based on the axial exhaust clearance dimensions measured by a dial indicator before assembly.

[0025] The specific implementation scenario of this utility model is as follows: When assembling the male and female rotors in the production or maintenance of a twin-screw refrigeration compressor, a process bushing tool is first used to replace the angular contact ball bearings used for axial positioning at the exhaust end of the male and female rotors. The process bushing tool with hole-shaft clearance fit can easily achieve disassembly and assembly, avoiding the difficulty and inconvenience of repeatedly disassembling the interference fit angular contact ball bearings during the adjustment of axial clearance.

[0026] When the rotor axial exhaust clearance is too large, such as Figure 3 As shown, the axial exhaust clearance is measured using a dial indicator. If the exhaust clearance is larger than the assembly process standard requirement, first remove the round nut 10, then remove the retaining washer 9, remove the process bushing 14 from the pull-out, remove the inner adjusting shim 6, and grind the inner adjusting shim 6 to the corresponding size according to the dial indicator measurement before reinstalling it. After installation, measure the axial exhaust clearance again using a dial indicator. If it meets the assembly process requirement, heat-fit the angular contact ball bearing and lock it with the retaining washer 9 and round nut 10 to complete the rotor axial exhaust clearance positioning. If the size is still too large, repeat this adjustment process until the requirement is met.

[0027] When the rotor axial exhaust clearance is too small, such as Figure 4As shown, the axial exhaust clearance is measured using a dial indicator. If the exhaust clearance is smaller than the assembly process standard requirement, first remove the round nut 10, then remove the retaining washer 9, remove the process bushing 14 from the pull-out, remove the outer adjusting shim 7, and grind the outer adjusting shim 7 to the corresponding size according to the dial indicator measurement before reinstalling it. After installation, measure the axial exhaust clearance again using a dial indicator. If it meets the assembly process requirement, heat-fit the angular contact ball bearing and tighten it with the retaining washer 9 and round nut 10 to complete the positioning of the rotor axial exhaust clearance. If the size is still too small, repeat this adjustment process until the requirement is met.

[0028] Similarly, the method for adjusting the exhaust clearance of the female rotor is the same as that for the male rotor. The difference is that the axial positioning of the female rotor is achieved using a bearing cap instead of a retaining washer and a round nut.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tool for adjusting the axial clearance of a screw compressor rotor, characterized in that, The screw compressor includes an inner adjusting shim, an outer adjusting shim, and a removable process bushing. The rotor comprises a male rotor and a female rotor. The exhaust end of the rotor is mounted in the inner hole of the exhaust end seat via a bearing bush. A cylindrical roller bearing is fitted onto the rotor shaft shoulder, with the outer ring of the cylindrical roller bearing mounted against the bearing bush. The inner adjusting shim is fitted onto the rotor shaft against the inner ring of the cylindrical roller bearing, and the outer adjusting shim is fitted against the outer ring of the cylindrical roller bearing. A pair of angular contact ball bearings are fitted face-to-face onto the rotor shaft. The specifications of the process bushing match those of the angular contact ball bearings. Before assembly, the angular contact ball bearings are replaced with the process bushing, and the process bushing contacts the inner and outer adjusting shims. Under normal use, the angular contact ball bearings contact the inner and outer adjusting shims.

2. The screw compressor rotor axial clearance adjustment tool according to claim 1, characterized in that, The angular contact ball bearing of the male rotor is fastened by a retaining washer and a round nut. The shaft seal sleeve is installed in the exhaust end seat of the male rotor. A disc spring is installed on the outside of the shaft seal sleeve, and the other end contacts the angular contact ball bearing near the exhaust end. The shaft seal cover is installed on the exhaust end seat of the male rotor by an internal hex nut. The disc spring and shaft seal sleeve provide preload force to the outer ring of the angular contact ball bearing.

3. The screw compressor rotor axial clearance adjustment tool according to claim 1, characterized in that, The bearing sleeve is installed in the exhaust end seat of the female rotor. A disc spring is installed on the outside of the bearing sleeve, and the other end contacts the angular contact ball bearing near the exhaust end. The bearing end cover is installed on the exhaust end seat of the female rotor by means of an internal hex nut. The bearing cover presses the inner ring of the angular contact ball bearing onto the female rotor shaft by means of an internal hex nut.

4. The screw compressor rotor axial clearance adjustment tool according to claim 1, characterized in that, The dimensions of the inner and outer adjusting shims are adjusted based on the axial exhaust clearance dimensions measured by a dial indicator before assembly.

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