Supercharger rotor axial limiting structure

Abstract

The application discloses a supercharger rotor axial limiting structure, which comprises a bearing structure body, the bearing structure body comprises a bearing seat, a bearing outer ring is fixedly connected in the bearing seat, a roller is rotationally connected with the bearing outer ring, a bearing inner ring is rollingly connected with the roller, and the bearing seat is connected with a limiting mechanism for moving the bearing inner ring; the ball is arranged on the bearing structure supporting the rotor shaft of the supercharger, is used for limiting the bearing inner ring when the right end of the rotor shaft rightward expands due to heat, and avoids the rotor shaft from being damaged due to the contact between the right side of the bearing inner ring and the inner wall of the bearing seat; in the rotating process of the bearing inner ring, the ball is driven to rotate in the ball rail; in the rightward moving process of the ball, the piston is pushed to move rightward in the buffer cylinder, the air cavity is compressed, and the bearing inner ring is buffered and limited.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rotating machinery, in particular to an axial limiting structure of a supercharger rotor. BACKGROUND

[0002] When the marine low-speed supercharger is installed, the rotor shaft of the impeller in the supercharger is supported at both ends by bearings, one end is fixed with the rotor shaft by a fixed bearing, and the other end is connected with a floating bearing. The floating bearing can move horizontally in the bearing outer ring, synchronously moves with the thermal expansion of the end of the rotor shaft, compensates the thermal expansion elongation of the end of the rotor shaft, and reduces the axial thrust. The semi-floating bearing of the existing marine low-speed supercharger is connected with one end of the rotor shaft. When the end of the rotor shaft is thermally expanded and elongated to drive the bearing inner ring to move, if the thermal expansion elongation of the end of the rotor shaft changes in position, the bearing inner ring will be in contact and friction with the inner wall of the bearing structure, which will cause resistance to the rotation of the rotor shaft and damage the rotor. The conventional thrust bearing has large friction loss, and it is not easy to improve the efficiency of the supercharger. SUMMARY

[0003] The present application aims at the deficiencies of the prior art, and provides an axial limiting structure of a supercharger rotor.

[0004] The present application provides the following technical scheme: an axial limiting structure of a supercharger rotor, comprising a bearing structure body, the bearing structure body comprises a bearing seat, the bearing seat is connected with a bearing outer ring inside, the bearing outer ring is connected with a roller, the roller is connected with a bearing inner ring in a rolling manner, and the bearing seat is connected with a limiting mechanism for the movement of the bearing inner ring.

[0005] The limiting mechanism comprises a buffer cylinder, the buffer cylinder is fixedly connected with the outer wall of the bearing seat, a piston is horizontally slidably arranged in the buffer cylinder, the piston is fixed with a piston rod, the piston rod is connected with a bead rail through a fixing sleeve, the bead rail is an annular track, and a plurality of rolling beads are arranged in the bead rail.

[0006] Preferably, the end of the bead rail is fixed with a fixing sleeve, the fixing sleeve is provided with a slot, and the piston rod is inserted into the slot.

[0007] Preferably, the fixing sleeve and the piston rod are screw-connected with a bolt.

[0008] Preferably, an air cavity is filled between the right side of the piston and the buffer cylinder.

[0009] Preferably, the buffer cylinder has an adjusting hole, and the position of the piston can be adjusted through the adjusting hole.

[0010] Compared with the prior art, the present application has the following advantages:

[0011] The application sets a ball on the bearing structure supporting the rotor shaft of the supercharger, which is used for limiting the bearing inner ring when the right end of the rotor shaft expands rightward, avoiding the contact between the right side of the bearing inner ring and the inner wall of the bearing seat, which causes the increase of the resistance of the rotor shaft and the damage, and the bearing inner ring drives the ball to rotate in the ball track during the rotation process, and the ball pushes the piston to move rightward in the buffer cylinder during the rightward movement, compresses the air cavity, and buffers and limits the bearing inner ring. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a structural schematic diagram of the application;

[0013] Fig. 2 It is a structural schematic diagram of the ball track and the piston rod.

[0014] In the figure: 1, rotor shaft, 2, roller, 3, bearing seat, 4, bearing outer ring, 5, ball, 6, ball track, 7, buffer cylinder, 8, adjusting hole, 9, air cavity, 10, piston, 11, piston rod, 12, bearing inner ring, 13, fixed sleeve, 14, bolt, 15, insertion slot, 16, inner wall of the bearing seat. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0016] Please refer to Figs. 1-2 The application provides a supercharger rotor shaft limiting structure, which comprises a bearing structure body, the bearing structure body comprises a bearing seat 3, the bearing seat 3 is connected with a bearing outer ring 4, the bearing outer ring 4 is connected with a roller 2, the roller 2 is connected with a bearing inner ring 12, a semi-floating bearing is composed of the bearing outer ring 4, the roller 2 and the bearing inner ring 12, a rotor shaft 1 of a supercharger is inserted into the bearing inner ring 12 for fixation and support, when the right end of the rotor shaft 1 expands rightward due to heat, the bearing inner ring 12 is driven to move rightward to produce displacement with the bearing outer ring 4, so that the right end of the rotor shaft can move rightward freely due to heat expansion, and the expansion of the right end of the shaft due to heat expansion is compensated. The above is the prior art.

[0017] Different from the prior art, the bearing seat 3 is connected with a limiting mechanism for moving the bearing inner ring 12, the limiting mechanism comprises a buffer cylinder 7, the buffer cylinder 7 is fixedly connected with the outer wall of the bearing seat 3, the buffer cylinder 7 is internally provided with a piston 10, the right side of the piston 10 is provided with an air cavity 9 between the buffer cylinder 7, the piston 10 is fixedly provided with a piston rod 11, the end of the piston rod 11 is connected with a fixed sleeve 13, the fixed sleeve 13 is connected with a bead track 6, the bead track 6 is an annular track, the bead track 6 is internally provided with rolling balls 5, when the bearing inner ring 12 moves rightward synchronously with the thermal expansion of the right end of the rotor shaft 1, the right side of the bearing inner ring 12 is in contact with the rolling balls 5, the rolling balls 5 are pushed to move rightward, the piston rod 11 and the piston 10 move rightward in the buffer cylinder 7, the air cavity 9 is compressed, the bearing inner ring 12 moving rightward is buffered, at the same time, when the bearing inner ring 12 is in contact with the rolling balls 5 and rotates, the rolling balls 5 rotate in the bead track 6, the contact abrasion of the bearing inner ring 12 touching the inner wall 16 of the bearing seat is avoided.

[0018] Further, the end of the bead track 6 is fixedly provided with the fixed sleeve 13, the fixed sleeve 13 is provided with a slot 15, the piston rod 11 is inserted into the slot 15, the bead track 6 is sleeved on the piston rod 11 through the fixed sleeve 13, the rolling balls 5 are supported, one side of the bead track 6 is provided with an opening, a part of the rolling balls 5 is exposed, and the part is used for being in contact with the bearing inner ring 12.

[0019] Further, the fixed sleeve 13 and the piston rod are screw-connected with a bolt 14, when the bearing structure is disassembled and separated from the rotor shaft 1, in order to replace the worn bead track 5, an operator rotates the disassembling bolt 14, moves the fixed sleeve 13 away from the piston rod 11, and disassembles, lubricates or replaces the rolling balls 5 and the bead track 6.

[0020] Further, the buffer cylinder 7 is provided with an adjusting hole 8, the position of the piston can be adjusted through the discharge and filling of air in the adjusting hole 8.

Claims

1. A supercharger rotor axial limiting structure, comprising a bearing structure body, the bearing structure body comprising a bearing seat (3), a bearing outer ring (4) is connected in the bearing seat (3), the bearing outer ring (4) is rollingly connected with a roller (2), the roller (2) is rollingly connected with a bearing inner ring (12), characterized in that: The bearing seat (3) is connected with a limiting mechanism for moving the bearing inner ring (12); The limiting mechanism comprises a buffer cylinder (7) fixedly connected with the outer wall of the bearing seat (3), the buffer cylinder (7) is internally provided with a horizontally sliding piston (10), the piston (10) is fixed with a piston rod (11) in sliding connection with the bearing seat (3), the end of the piston rod (11) is connected with a bead rail (6), the bead rail (6) is internally connected in rolling connection with a ball (5) located at the right side of the bearing inner ring (12), and the right side of the piston (10) and the buffer cylinder (7) are filled with an air cavity (9); The end of the bead rail (6) is fixed with a fixed sleeve (13) provided with a slot (15), the piston rod (11) is inserted into the slot (15); The fixed sleeve (13) and the piston rod are screw-connected with a bolt (14); The buffer cylinder (7) is provided with an adjusting hole (8); The rotor shaft of the supercharger is inserted into the bearing inner ring for fixation; One side of the bead rail is provided with an opening for exposing a part of the ball for contacting the bearing inner ring.

2. The axial stop structure for a supercharger rotor shaft according to claim 1, characterized in that: When the bearing inner ring moves rightward synchronously with the thermal expansion of the right end of the rotor shaft, the right side of the bearing inner ring contacts the ball, pushes the ball to move rightward, and makes the piston rod and the piston move rightward in the buffer cylinder, compresses the air cavity, buffers the rightward moving bearing inner ring, and makes the ball rotate in the bead rail when the bearing inner ring rotates in contact with the ball.

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