Transmission device of small multi-stage high-pressure wobble plate compressor

Abstract

According to the transmission device of the small-sized multi-stage high-pressure wobble plate compressor, the radial force transmitted to the piston by the connecting rod is counteracted in a manner that the linear bearing is matched with the piston rod to form a sliding pair, particularly, the diameter of the high-pressure stage piston is small, and the force of the connecting rod is large; piston bending deformation caused by large radial force certainly generates hidden dangers such as sealing failure of a piston ring and serious abrasion between the piston and an air cylinder. The rotary support of the driving shaft is provided by a two-way thrust angular contact ball bearing which is higher in bearing capacity and more stable in operation, and radial force and two-way thrust can be borne at the same time. The rotary support of the wobble plate relative to the driving shaft is provided by a bidirectional thrust ball bearing structure consisting of the wobble plate, the driving shaft, the ball pressing ring and the balls, so that the wobble plate is more compact relative to a rotary mechanism of the driving shaft. Considering that the autorotation torque of the wobble plate is increased along with the increase of gas pressure, bevel teeth designed on the outer edge of the wobble plate are meshed with bevel teeth of a fixed bevel gear to serve as an anti-rotation mechanism, the arm of force is increased, and the meshing force of the bevel teeth in the anti-rotation mechanism is reduced.

Description

Technical Field

[0001] The invention relates to the field of compressors and is suitable for the transmission structure design of a small multi-stage high-pressure swing plate compressor. Background Art

[0002] The wobble compressor is widely used in the field of automobile refrigeration due to its compact structure and light weight. In recent years, with the urgent demand for high-pressure gas sources in mobile equipment and the aviation field, the multi-stage, high-pressure and miniaturization of the wobble compressor is an inevitable development trend. The multi-stage wobble compressor often uses a variable-section cylinder, with a smaller piston diameter at the high-pressure stage and a larger piston diameter at the low-pressure stage. High pressure means that the piston requires a greater driving force, which will lead to greater radial force on the piston, greater axial force on the drive shaft system, and greater rotation torque of the wobble plate. Miniaturization requires the wobble compressor to have a more compact rotating support structure to realize the conversion of the drive shaft rotation to the reciprocating motion of the piston. Therefore, the transmission structure of the traditional wobble compressor can no longer meet the actual working conditions of small multi-stage high-pressure wobble compressors. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a small multi-stage high-pressure swing plate compressor transmission device. The linear bearing and the piston rod are used to form a sliding pair to solve the problem of excessive radial force transmitted to the piston by the connecting rod, so as to avoid the hidden dangers of the piston rod being subjected to a large bending moment, resulting in failure of the piston ring seal, serious wear between the piston and the cylinder, etc. The rotation support of the drive shaft is provided by a bidirectional thrust angular contact ball bearing with stronger load-bearing capacity and smoother operation, which can withstand radial force and bidirectional thrust at the same time. The rotation support of the swing plate relative to the drive shaft is provided by a bidirectional thrust angular contact ball bearing structure composed of a swing plate, a drive shaft, a ball pressure ring and balls, so that the rotation mechanism of the swing plate relative to the drive shaft is more compact. The meshing of the outer edge bevel gear of the swing plate and the fixed bevel gear is used as an anti-rotation mechanism to increase the force arm, which is conducive to avoiding a large bevel gear meshing force caused by an increase in the self-rotation torque.

[0004] To this end, the present invention provides a small multi-stage high-pressure wobble plate compressor transmission device, including: a right housing, a cylinder, a piston, a linear bearing, a connecting rod, a fixed bevel gear adjustment gasket, a housing adjustment gasket, a left housing, a fixed bevel gear, a driving shaft, a shaft elastic ring, a bearing axial positioning gasket, a bidirectional thrust angular contact ball bearing, a bearing pressure cover, a bearing pressure cover adjustment gasket, a ball, a wobble plate, a ball pressure ring adjustment gasket, a screw and a ball pressure ring. Among them, the bidirectional thrust angular contact ball bearing provides rotation support for the driving shaft, and the shaft elastic ring, the bearing axial positioning gasket, the bearing pressure cover and the left housing together provide axial positioning for the driving shaft and the bidirectional thrust angular contact ball bearing; the driving shaft, the ball, the wobble plate and the ball pressure ring form a bidirectional thrust angular contact ball bearing, which provides rotation support for the rotation of the wobble plate relative to the driving shaft; the outer edge of the wobble plate is processed with bevel teeth, which mesh with the bevel teeth on the fixed bevel gear to achieve anti-rotation of the wobble plate; the piston rod and the linear bearing form a sliding pair to offset the radial force transmitted to the piston by the connecting rod.

[0005] The drive shaft not only bears the time-varying torque, but also the axial and radial forces transmitted from the connecting rod. The double-direction angular contact ball bearing not only provides rotation support for the drive shaft, but also can bear the combined radial and axial loads, and has a strong carrying capacity. The outer ring of the double-direction angular contact ball bearing is axially positioned by the left housing and the bearing gland, and the inner ring on the left side of the bearing is axially positioned by the shaft elastic ring and the bearing axial positioning gasket. The axial clearance of the bearing can be adjusted by selecting bearing axial positioning gaskets of different thicknesses and bearing adjustment gaskets.

[0006] The right end face of the drive shaft is an inclined surface and is designed with a ball raceway. Ball pipes are designed on both sides of the wobble plate, and a ball raceway is also designed on the left side of the ball pressure ring. The ball raceway on the left side of the wobble plate, the drive shaft ball raceway and the balls together form a one-way angular contact ball bearing; the ball raceway on the right side of the wobble plate, the ball pressure ring raceway and the balls together form another one-way angular contact ball bearing. The drive shaft, wobble plate, ball pressure ring and balls together form a two-way angular contact ball bearing structure, which provides support for the rotation of the wobble plate relative to the drive shaft. The axial positioning of the two-way angular contact ball bearing is provided by screws and ball pressure ring adjustment gaskets. The axial clearance of the two-way angular contact ball bearing can be adjusted by selecting ball pressure ring adjustment gaskets of different thicknesses.

[0007] The outer edge of the wobble plate is designed with bevel teeth, which are meshed with the bevel teeth on the fixed bevel gear to prevent the wobble plate from rotating. The thickness of the fixed bevel gear adjustment gasket between the fixed bevel gear and the right housing can adjust the clearance volume of the compression chamber. The correct meshing between the wobble plate bevel teeth and the fixed bevel gear can be achieved by selecting a housing adjustment gasket of appropriate thickness. The meshing of the bevel teeth on the outer edge of the wobble plate increases the force arm, which is conducive to reducing the meshing force under the same size of the wobble plate self-rotation torque. The wobble plate performs spatial swinging motion under the joint action of the drive shaft, balls, ball pressure ring and bevel gear meshing, thereby driving the connecting rod and driving the piston to reciprocate. The sliding pair composed of the piston rod and the rolling bearing can offset the radial force of the connecting rod on the piston, especially in the high-pressure stage, where the piston diameter is smaller and the radial force is greater. If it is not offset, the bending deformation of the piston rod will lead to the failure of the seal between the piston and the cylinder, increased wear and other consequences.

[0008] Based on the above design, the requirements of the transmission structure of the swing plate compressor can be met, and it is particularly suitable for the transmission structure of a small multi-stage high-pressure swing plate compressor.

[0009] The present invention is a transmission device for a small multi-stage high-pressure swing plate compressor. The use and design of a bidirectional thrust angular contact ball bearing improves the bearing capacity of the shaft system and makes the transmission structure more compact. The sliding pair composed of the piston rod and the linear bearing can offset the lateral force transmitted to the piston by the connecting rod. The bevel gear design on the outer edge of the swing plate is conducive to reducing the meshing force of the anti-rotation bevel gear structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention is described below in conjunction with the accompanying drawings.

[0011] Figure 1 is a general layout diagram of a wobble plate compressor transmission device according to one embodiment of the present invention;

[0012] Figure 2 is a layout diagram of a plate swing mechanism according to one embodiment of the present invention. DETAILED DESCRIPTION

[0013] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the implementation described below is only exemplary and not restrictive.

[0014] like Figure 1 and Figure 2As shown, the transmission device of the small multi-stage high-pressure swing plate compressor includes: a right shell 1, a cylinder 2, a piston 3, a linear bearing 4, a connecting rod 5, a fixed bevel gear adjustment gasket 6, a shell adjustment gasket 7, a left shell 8, a fixed bevel gear 9, a drive shaft 10, a shaft elastic retaining ring 11, a bearing axial positioning gasket 12, a bidirectional thrust angular contact ball bearing 13, a bearing cover 14, a bearing cover adjustment gasket 15, a ball 16, a swing plate 17, a ball pressure ring adjustment gasket 18, a screw 19 and a ball pressure ring 20.

[0015] like Figure 1 As shown, in order to meet the requirements of rotation support and axial load of the drive shaft, a bidirectional thrust angular contact ball bearing 13 with stronger load-bearing capacity and smoother operation is adopted. The right inner ring of the bidirectional thrust angular contact ball bearing 13 interacts with the shoulder of the drive shaft 10, the right side of the outer ring contacts the boss of the left housing 8, and the left side of the outer ring contacts the bearing cover 13 to achieve axial positioning of the outer ring. The bearing cover 13 is fixed to the left housing 8 by flange screws. The left inner ring of the bidirectional thrust angular contact ball bearing 13 is axially positioned by the shaft elastic ring 11 and the bearing axial positioning gasket 12. The axial clearance of the bidirectional thrust angular contact ball bearing 13 can be adjusted by adjusting the thickness of the bearing cover adjustment gasket 15 and the bearing axial positioning gasket 12. The linear bearing 4 is fixed to the right housing 1 by flange screws, and forms a sliding pair with the piston 3 to offset the radial force of the piston 3. After the linear bearing 4 is installed, the fixed bevel gear 9 and the fixed bevel gear adjustment gasket 6 are fixed to the right housing 1 by flange screws. The left housing 8 and the right housing 1 are also fixedly connected by flange screws. The selection of fixed bevel gear adjustment gasket 6 and housing adjustment gasket 7 of appropriate thickness can achieve a small adjustment of the clearance volume of the compression chamber and the correct meshing of the bevel gear pair. The ball joint seats at both ends of the connecting rod 5 can be fixedly connected to the piston rod and the wobble plate by threaded connection or flange surface connection.

[0016] like Figure 2As shown, the right side of the drive shaft 10 is an inclined plane with a certain inclination angle and is designed with a ball rolling track, and the wobble plate 17 and the ball pressing ring 20 are both designed with ball rolling tracks. The drive shaft 10, the balls 16 and the wobble plate 17 together form a one-way angular contact ball bearing, and the balls 16 roll in the rolling track formed by the drive shaft 10 and the wobble plate 17 to provide radial bidirectional and axial unidirectional support for the rotation of the wobble plate 17 relative to the drive shaft 10. The wobble plate 17, the balls 16 and the ball pressing ring 20 together form another one-way angular contact ball bearing, and the balls 16 roll in the rolling track formed by the wobble plate 17 and the ball pressing ring 20 to provide radial bidirectional and axial unidirectional support for the rotation of the wobble plate 17 relative to the ball pressing ring 20. The two one-way angular contact ball bearings are combined into a bidirectional angular contact ball bearing structure, which provides radial and axial rotation support for the rotation of the wobble plate 17 relative to the drive shaft 10. The ball pressing ring adjusting shim 18 and the screw 19 provide axial positioning for the ball pressing ring 20. The ball pressing ring adjusting shim 18 with appropriate thickness can be used to adjust the clearance of the ball 16 in the raceway. The anti-rotation of the swing plate 17 is achieved by gear meshing between the swing plate 17 and the fixed bevel gear 9.

[0017] Based on this disclosure, many variations in the configuration and operational sequence of the illustrated and described features will be apparent to those skilled in the art. Therefore, it should be appreciated that various changes can be made to this patent without departing from the spirit and scope of the claimed subject matter.

Claims

1. A small multi-stage high-pressure wobble plate compressor transmission device, characterized in that It comprises a right housing (1), a cylinder (2), a piston (3), a linear bearing (4), a connecting rod (5), a fixed bevel gear adjustment gasket (6), a housing adjustment gasket (7), a left housing (8), a fixed bevel gear (9), a driving shaft (10), a shaft elastic retaining ring (11), a bearing axial positioning gasket (12), a bidirectional thrust angular contact ball bearing (13), a bearing pressure cover (14), a bearing pressure cover adjustment gasket (15), a ball (16), a wobble plate (17), a ball pressure ring adjustment gasket (18), a screw (19) and a ball pressure ring (20); The use of a bidirectional thrust angular contact ball bearing (13) with strong load-bearing capacity and more stable operation not only provides rotation support for the drive shaft (10), but also more reliably bears the axial force from the piston (3); the axial positioning of the bidirectional thrust angular contact ball bearing (13) is provided by the left housing (8), the shaft elastic retaining ring (11), the bearing axial positioning gasket (12) and the bearing pressure cover (14); the axial clearance of the bidirectional thrust angular contact ball bearing (13) can be adjusted by adjusting the thickness of the bearing axial positioning gasket (12) and the bearing pressure cover adjustment gasket (15); The linear bearing (4) is fixed to the right housing (1) by means of flange screws, and forms a sliding pair with the piston rod portion of the piston (3). The radial component force transmitted to the piston (3) by the connecting rod (5) can be offset by the sliding pair between the piston rod and the linear bearing (4). In particular, in the high-pressure stage, the piston (3) has a smaller diameter, and the radial component force of the connecting rod force is larger. The sealing leakage and aggravated wear caused by the bending deformation of the piston (3) due to the radial force are more significant, and the linear bearing (4) is particularly important. The outer edge of the wobble plate (17) is designed with bevel teeth, which are meshed with the bevel teeth on the fixed bevel gear (9) to prevent the wobble plate from rotating. This design increases the force arm, especially the rotation torque that the anti-rotation mechanism needs to offset under high pressure is larger, which is conducive to reducing the meshing force of the bevel teeth. The right side of the driving shaft (10) is an inclined surface with a certain inclination angle and is designed with a raceway for matching with the ball (16); the swing plate (17) and the ball pressure ring (20) are both designed with a raceway for matching with the ball (16); the ball (16) rolls in the raceway formed by the driving shaft (10) and the swing plate (17) to provide radial bidirectional and axial unidirectional rotation support for the swing plate (17) to rotate relative to the driving shaft (10); the ball (16) rotates between the swing plate (17) and the ball pressure ring (20) ) provides radial bidirectional and axial unidirectional support for the rotation of the wobble plate (17) relative to the ball pressing ring (20); the drive shaft (10), the balls (16), the wobble plate (17) and the ball pressing ring (20) together form a bidirectional thrust angular contact ball bearing structure, and the axial clearance can be adjusted by adjusting the thickness of the ball pressing ring adjusting gasket (18); the ball pressing ring adjusting gasket (18) and the screw (19) together provide axial positioning for the ball pressing ring (20).

Images