Compact and efficient small four-stage wobble plate compressor with pressure fluctuation between low stages

Abstract

The invention relates to a compact and efficient small four-stage wobble plate compressor with pressure fluctuation between low stages, and belongs to the technical field of compressors. In a single-side four-stage wobble plate compressor, due to the limitation of the structure, the phase interval between a front-stage piston and a rear-stage piston cannot be 180 degrees, and the movement of the pistons cannot be 180 degrees, so that the flow of the compressor can be reduced to a certain extent, and the fluctuation of gas pressure in an inter-stage cavity can be increased. In order to solve the problem, the invention provides a novel structural design. By the adoption of the connecting rod and piston connecting mode that one connecting rod drives the two pistons at the same time, the movement phase interval between the front-stage piston and the rear-stage piston can be 180 degrees, and the pistons of all stages can be more compact. And meanwhile, the compactness and integration of the overall structure of the four-stage wobble plate compressor are ensured by adopting the design of flange surfaces capable of being connected on two sides and the design of a high-integration driving device, and the miniaturization of the multi-stage wobble plate compressor is facilitated. The multi-stage wobble plate compressor has important practical significance in application of the multi-stage wobble plate compressor in the fields of aviation, mobile equipment and the like.

Description

Technical Field

[0001] The present invention relates to the field of compressor technology, and in particular to a multi-stage swing plate compressor, specifically a compact, efficient, and low-stage pressure fluctuation small four-stage swing plate compressor, which is suitable for fields such as aviation and mobile equipment that have high requirements for structural compactness and high pressure output capacity. Background Art

[0002] As a device that converts mechanical energy into gas pressure energy, compressors are widely used in the fields of industry, aviation, automobiles, mobile devices, etc. With the diversification of application scenarios, the performance requirements for compressors are also increasing, especially in terms of high pressure output and compact structure. Traditional single-stage wobble plate compressors are widely used in the field of automotive refrigeration due to their simple structure and low manufacturing cost. However, the output pressure of single-stage compressors is limited and it is difficult to meet the demand for high pressure output. For this reason, multi-stage wobble plate compressors came into being to achieve higher output pressure through multi-stage compression. In a single-side multi-stage wobble plate compressor, due to structural limitations, the phase interval between the front and rear stage pistons cannot be 180 degrees, and the movement of the pistons cannot achieve a 180-degree phase interval, so that the exhaust process of the previous stage and the suction process of the next stage cannot overlap well in time, which will reduce the flow rate of the compressor to a certain extent and increase the fluctuation of the gas pressure in the interstage chamber, thereby having a negative impact on the volumetric efficiency and service life of the compressor. Although arranging pistons on both sides of the swash plate can achieve a 180-degree phase interval between the front and rear stage pistons, this design will significantly increase the size of the compressor, which is difficult to meet the requirements of aviation, mobile devices and other fields. Therefore, the development of a compact, efficient, small single-sided four-stage swing plate compressor with low inter-stage pressure fluctuation has important practical significance and application prospects. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a compact, efficient, and low-inter-stage pressure fluctuation small four-stage wobble plate compressor. The proposed compressor uses a double ball head connecting rod to drive two pistons at the same time, so that the phase interval between the front and rear stage pistons of the four-stage wobble plate compressor is 180 degrees. In order to avoid the failure of the piston ring seal due to the bending moment of the piston and to ensure the smooth axial reciprocating motion of the piston, a linear bearing and a reciprocating motion component are used to form a sliding pair. In addition, the integrated design makes the drive motor, reducer and compressor body more compact and more integrated.

[0004] To this end, the present invention provides a compact, efficient, and low-inter-stage pressure fluctuation small four-stage wobble plate compressor, comprising: a motor, a sun gear, a planetary gear, a planetary reducer housing, a planetary carrier, a bearing seat, a bearing, a wobble plate drive shaft, a left housing, a wobble plate, a fixed bevel gear, a first and a third-stage ball joint seat on the wobble plate side, a first and a third-stage drive connecting rod, a first and a third-stage ball joint seat on the piston side, a first and a third-stage piston drive arm, a first and a third-stage linear bearing group, a second and a fourth-stage ball joint seat on the wobble plate side, a second and a fourth-stage drive connecting rod, a second and a fourth-stage ball joint seat on the piston side, a second and a fourth-stage piston drive arm, a second and a fourth-stage linear bearing group, a first-stage piston, a second-stage piston, a third-stage piston, a fourth-stage piston, a cylinder, a right-side housing, and a cylinder head. Among them, the motor, sun gear, planetary gear, planetary reducer housing and planetary carrier together constitute the driving device of the compressor; the bearing seat, bearing, swing plate drive shaft, left housing, swing plate and fixed bevel gear together constitute the transmission device of the compressor; the first and third stage ball joint seat on the swing plate side, the first and third stage drive connecting rod, the first and third stage ball joint seat on the piston side, the first and third stage piston drive arm, the first and third stage linear bearing group, the second and fourth stage ball joint seat on the swing plate side, the second and fourth stage drive connecting rod, the second and fourth stage ball joint seat on the piston side, the second and fourth stage piston drive arm, the second and fourth stage linear bearing group, the first stage piston, the second stage piston, the third stage piston and the fourth stage piston together constitute two groups of one-drive-two devices, which can achieve the goal of 180 degrees between the front and rear stage piston movement phases; the compression chamber part is composed of pistons of various levels, cylinders, the right housing and the cylinder head.

[0005] The output shaft of the motor drives the sun gear and then drives the planetary gear through a key connection. The inner gear ring designed on the left end of the planetary reducer housing meshes with the planetary gear. At the same time, the flange surface of the planetary reducer housing adopts a double-sided connection design. The flange surface of the planetary reducer housing is fixedly connected to the flange surface of the right end of the motor to the left, and is fixedly connected to the bearing seat to the right. The outer cylindrical surface of the planetary reducer housing cooperates with the inner cylindrical surface of the motor housing to ensure that the planetary reducer is accurately positioned relative to the motor. The main part of the planetary reducer is placed in the motor housing, making the drive device more compact and more integrated. In addition, the spline shaft at the right end of the planetary carrier is connected to the spline hole at the left end of the swing plate drive shaft to achieve power transmission. The connection between the planetary reducer housing and the left housing of the compressor is achieved through the transition flange surface connection of the bearing seat. The transmission structure design from the motor to the planetary reducer and from the planetary carrier to the swing plate drive shaft greatly improves the axial space utilization.

[0006] The flange surface of the bearing seat is used as a transition flange surface for connecting the drive device and the compressor, and also adopts a flange surface design that can be connected on both sides. The left end flange surface of the bearing seat is fixed to the left end flange surface of the left shell of the compressor by screws to the right, and is fixed to the right end flange surface of the planetary reducer shell by screws to the left. The bearing seat not only plays the role of connecting the drive device and the compressor shell, but also provides a fixed position for the bearing. The compressor shell consists of a left shell and a right shell. The right shell is provided with a fixed bevel gear mounting stop to facilitate the positioning and installation of the fixed bevel gear. At the same time, the cylindrical profile of the fixed bevel gear provides positioning for the installation connection between the left shell and the right shell. The detachable design of the compressor shell can facilitate the installation and connection between the first and third stage ball joint seat, the first and third stage piston drive arm, the first stage piston, the third stage piston, the first and third stage linear bearing group, the second and fourth stage ball joint seat, the second and fourth stage piston drive arm, the second stage piston, the fourth stage piston and the second and fourth stage linear bearing group on the piston side. The cylinder head can integrate various levels of intake and exhaust valves, interstage pipes and interstage cooling channels, etc., and the cylinder head and the right shell are connected by a flange surface. The design of the planetary reducer housing and the bearing seat with flange surfaces that can be connected on both sides ensures the integration of the compressor and is conducive to the miniaturization of the compressor.

[0007] The drive shaft of the wobble plate rotates under the drive of the planet carrier and the support of the bearing. Due to the meshing action of the bevel gear on the outer edge of the wobble plate and the fixed bevel gear, the wobble plate rotates relative to the wobble plate drive shaft and swings back and forth in space. The first and third level ball joint seats on the wobble plate side and the second and fourth level ball joint seats on the wobble plate side are distributed on the wobble plate at intervals of 180 degrees, and the first and third level ball joint seats on the piston side and the second and fourth level ball joint seats on the piston side are distributed at intervals of 180 degrees relative to the rotation center line of the wobble plate drive shaft. One end of the connecting rod forms a ball joint pair with the ball joint seat on the wobble plate side, and the other end forms another pair of ball joint pairs with the piston side ball joint seat connected to the piston drive arm by threading. The first and third level piston drive arm and the second and fourth level piston drive arm both have guide rod parts, which respectively form sliding pairs with the corresponding holes of the first and third level linear bearing group and the second and fourth level linear bearing group to provide guidance for the reciprocating motion of the piston drive arm and avoid the lateral force generated by the connecting rod from acting on the piston. The two ends of the first and third stage piston driving arms are respectively fixedly connected with the piston rod ends of the first stage piston and the piston rod ends of the third stage piston by screws, and the two and fourth stage piston driving arms are respectively fixedly connected with the piston rod ends of the second stage piston and the piston rod ends of the fourth stage piston by screws. The ends of the piston rods of each stage are provided with rectangular boss stops, and the connection between the piston driving arm and the piston rod end is provided with rectangular recesses. The cooperation of the boss stops and recesses provides positioning for the connection and installation of the piston rod and the piston driving arm on the one hand, and avoids the rotation of the piston along its axis on the other hand. In addition, considering the different gas forces on the pistons of each stage, in order to ensure the smooth reciprocating motion of the piston along the axial direction, the piston rods of each stage have linear bearings that cooperate with them to form a sliding pair. When the swing plate swings back and forth, the first and third stage piston driving arms and the second and fourth stage piston driving arms are driven to reciprocate through the first and third stage driving connecting rods and the second and fourth stage driving connecting rods. The first and third stage piston driving arms reciprocate with the first and third stage pistons, and the first and third stage pistons move in unison. The second and fourth stage piston drive arms carry the second and fourth stage pistons to reciprocate, and the second and fourth stage pistons move in unison. Because the two ball joints on the wobble plate side and the two ball joints on the piston side are spaced 180 degrees apart, the first stage piston motion curve phase is spaced 180 degrees relative to the second stage piston. Similarly, the second stage is spaced 180 degrees relative to the third stage, and the third stage is spaced 180 degrees relative to the fourth stage, thereby achieving a design in which the front and rear stage piston motion phases are spaced 180 degrees apart, providing feasibility in structural design for increasing the compressor flow and reducing inter-stage gas pressure fluctuations.

[0008] Based on the above design, the design goals of miniaturization, high volumetric efficiency and low inter-stage pressure fluctuation of the four-stage wobble plate compressor can be achieved.

[0009] Preferably, the structural form of the piston driving arm can be flexibly adjusted according to the actual size of each piston in the design, such as the line connecting the two piston rod fixing positions on the piston driving arm and the piston side ball hinge core fixing position is V-shaped, so that the four pistons are more compact with each other and the space occupancy rate of the compressor is reduced;

[0010] Preferably, a linear bearing structure is integrated on the right housing of the compressor, which is conducive to making the pistons more compact with respect to each other;

[0011] Preferably, the one-drive-many piston driving method of the present invention can also be applied to a multi-stage swash plate compressor, thereby achieving a phase interval of 180 degrees between the front and rear stage pistons of the multi-stage swash plate compressor;

[0012] The present invention is a compact, efficient, and low-stage pressure fluctuation small four-stage wobble plate compressor. It adopts a motor plus planetary reducer drive structure, and the drive device is more compact. It adopts a flange surface connection form that can be connected on both sides, so that the connection between the motor, planetary reducer, the left housing of the compressor, the right housing, and the cylinder head is more compact and the degree of integration is higher. It adopts a one-drive-two connecting rod piston connection method to achieve a 180-degree interval design of the front and rear stage piston movement phase, and also makes the pistons of each stage more compact. Based on the present invention, miniaturization and a 180-degree structural design of the front and rear stage piston movement phase can be achieved, thereby achieving the purpose of miniaturization, high volumetric efficiency, and low-stage pressure fluctuation of the four-stage wobble plate compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is described below in conjunction with the accompanying drawings.

[0014] Figure 1 is a general layout diagram of a compact, high-efficiency, small-sized four-stage wobble plate compressor with low inter-stage pressure fluctuation according to one embodiment of the present invention;

[0015] Figure 2 The present invention is an embodiment of a piston-connecting rod connection in which the front and rear stage piston movement phases are 180 degrees apart. DETAILED DESCRIPTION

[0016] The following will describe in detail the specific implementation of the present invention for a compact, efficient, and low-inter-stage pressure fluctuation small four-stage wobble plate compressor in conjunction with the accompanying drawings. It should be understood that the implementation described below is merely exemplary and not restrictive.

[0017] like Figure 1-2As shown, a compact, efficient, and low-inter-stage pressure fluctuation small-sized four-stage wobble plate compressor comprises: a motor 1, a sun gear 2, a planetary gear 3, a planetary reducer housing 4, a planetary carrier 5, a bearing seat 6, a bearing 7, a wobble plate drive shaft 8, a left housing 9, a wobble plate 10, a fixed bevel gear 11, a first and third-stage ball joint seat 12 on the wobble plate side, a first and third-stage drive connecting rod 13, a first and third-stage ball joint seat 14 on the piston side, a first and third-stage piston drive arm 15, a first and third-stage linear bearing group 16, a second and fourth-stage ball joint seat 17 on the wobble plate side, a second and fourth-stage drive connecting rod 18, a second and fourth-stage ball joint seat 19 on the piston side, a second and fourth-stage piston drive arm 20, a second and fourth-stage linear bearing group 21, a first-stage piston 22, a second-stage piston 23, a third-stage piston 24, a fourth-stage piston 25, a cylinder 26, a right-side housing 27, and a cylinder head 28.

[0018] like Figure 1 As shown, the planetary reducer housing 4 is fixed to the motor 1 by flange screws and cooperates with the motor housing through the cylindrical surface. The output shaft of the motor 1 is connected to the sun gear 2 of the planetary reducer by a key. The power of the motor 1 is transmitted to the planetary gear 3 and then drives the planetary carrier 5 to rotate. The right end flange surface of the planetary reducer housing 4 is designed with a hole for connecting and fixing with the left end flange surface of the bearing seat 6. At the same time, the left end flange surface of the bearing seat 6 is designed with a hole for connecting and fixing with the left end flange surface of the left housing 9. The motor 1, the planetary reducer housing 4, the bearing seat 6 and the left housing 9 of the compressor are fixedly connected by flange screw connection. The right side extension shaft of the planetary carrier 5 realizes power transmission with the wobble plate drive shaft 8 through a spline pair. The bearing 7 provides rotation support for the wobble plate drive shaft 8 and can also withstand the radial and axial forces from the wobble plate 10. The wobble plate 10 can rotate relative to the wobble plate drive shaft 8, and its rotation support is realized by the cooperation of two balls and ball raceways between the wobble plate 10 and the wobble plate drive shaft 8. The wobble plate 10 is meshed with the fixed bevel gear 11 to form an anti-rotation mechanism of the wobble plate. The fixed bevel gear 11 is fixed to the right side housing 27 of the compressor by screws, and a positioning stop for the fixed bevel gear 11 is provided on the right side housing 27 to facilitate the installation of the fixed bevel gear 11. In addition, the outer cylindrical profile of the fixed bevel gear 11 also serves as a positioning guide for the left side housing 9 of the compressor and the right side housing 27 to be fixedly connected by flange screws. The first three-stage linear bearing group 16 and the second four-stage linear bearing group 21 are fixed to the right side housing 27 of the compressor by flange surfaces. The cylinder 26 is placed in the right side housing 27 of the compressor by means of a stop, and the right side is limited by the cylinder cover 28.

[0019] like Figure 2As shown, the first three-stage ball joint seat 12 on the swing plate side and the second four-stage ball joint seat 17 on the swing plate side are fixed to the swing plate 10 by screws, and the two ball joint seats are symmetrically distributed relative to the center of the swing plate 10, that is, they are distributed at a phase interval of 180 degrees. The first three-stage ball joint seat 14 on the piston side is fixed to the first three-stage piston drive arm 15 by threaded connection, and the second four-stage ball joint seat 19 on the piston side is fixed to the second four-stage piston drive arm 20 by threaded connection. The first three-stage piston drive arm 15 and the second four-stage piston drive arm 20 are symmetrically distributed relative to the rotation center line of the swing plate drive shaft 8. The piston rod ends of the first piston 22 and the third piston 24 are fixedly connected to the first three-stage piston drive arm 15 by screws, and the rectangular boss stop at the end of the piston rod cooperates with the rectangular recess of the piston drive arm to facilitate positioning and prevent the piston from rotating. The guide rod portion of the first three-stage piston driving arm 15 and the corresponding hole position of the first three-stage linear bearing group 16 form a sliding pair, and the piston rod portions of the first stage piston 22 and the third stage piston 24 respectively form a sliding pair with the corresponding hole positions of the first three-stage linear bearing group 16. The piston rod ends of the second stage piston 23 and the fourth stage piston 25 are fixedly connected to the second and fourth stage piston driving arms 20 by screws, and the rectangular boss stop at the end of the piston rod cooperates with the rectangular recess of the piston driving arm to facilitate positioning and prevent the piston from rotating. The guide rod portion of the second and fourth stage piston driving arms 20 and the corresponding hole positions of the second and fourth stage linear bearing group 21 form a sliding pair, and the piston rod portions of the second stage piston 23 and the fourth stage piston 25 respectively form a sliding pair with the corresponding hole positions of the second and fourth stage linear bearing group 21. In this way, when the wobble plate 10 is driven by the wobble plate drive shaft 8 to swing back and forth, the first-stage driving connecting rod 13 drives the first-stage piston driving arm 15, the first-stage piston 22 and the third-stage piston 24 to make reciprocating linear motion under the action of the wobble plate 10, and the second-stage driving connecting rod 18 drives the second-stage piston driving arm 20, the second-stage piston 23 and the fourth-stage piston 25 to make reciprocating linear motion under the action of the wobble plate 10, thereby realizing a structural design in which the front and rear stage piston motions are 180 degrees apart in phase.

[0020] 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 compact, high-efficiency, small-sized four-stage wobble plate compressor with low inter-stage pressure fluctuation, characterized in that: include: A drive device consisting of a motor (1), a sun gear (2), a planetary gear (3), a planetary reducer housing (4) and a planetary carrier (5); a transmission device consisting of a bearing seat (6), a bearing (7), a wobble plate drive shaft (8), a left housing (9), a wobble plate (10) and a fixed bevel gear (11); a wobble plate side three-stage ball joint seat (12), a three-stage drive connecting rod (13), a piston side three-stage ball joint seat (14), a three-stage piston drive arm (15), a three-stage straight Two sets of one-drive-two devices are composed of a linear bearing group (16), a second and fourth stage ball joint seat (17) on the swing plate side, a second and fourth stage driving connecting rod (18), a second and fourth stage ball joint seat (19) on the piston side, a second and fourth stage piston driving arm (20), a second and fourth stage linear bearing group (21), a first stage piston (22), a second stage piston (23), a third stage piston (24) and a fourth stage piston (25), and a compression chamber part composed of a cylinder (26), a right side housing (27), a cylinder cover (28) and pistons at each stage; The piston driving structure of each stage is a one-drive-two-piston connecting rod connection structure, that is, the first-stage driving connecting rod (13) drives the first-stage spherical joint seat (14) on the piston side, the first-stage spherical joint seat (15), the first-stage piston (22) and the third-stage piston (24) to reciprocate linearly, and the second-stage driving connecting rod (18) drives the second-stage spherical joint seat (19) on the piston side, the second-stage spherical joint seat (20), the second-stage piston (23) and the fourth-stage piston (25) to reciprocate linearly. At the same time, the first-stage spherical joint seat (12) on the swing plate side and the second-stage spherical joint seat (17) on the swing plate side are distributed at an interval of 180 degrees on the swing plate (10), and the first-stage spherical joint seat (14) on the piston side and the second-stage spherical joint seat (19) on the piston side are distributed at an interval of 180 degrees relative to the rotation center line of the swing plate driving shaft (8), so as to realize the motion phase interval between the front and rear stage pistons. The intervals are all 180 degrees, which provides a structural basis for increasing the compressor flow and reducing the inter-stage gas pressure fluctuation to a certain extent; the bevel gear on the outer edge of the wobble plate (10) meshes with the fixed bevel gear (11), so that the wobble plate (10) rotates relative to the wobble plate drive shaft (8) and swings back and forth in space, and then drives the first-stage piston (22) and the third-stage piston (24) to synchronously reciprocate linearly through the first-stage and third-stage ball joint seats (12) on the wobble plate side, the first-stage and third-stage driving connecting rods (13), the first-stage and third-stage ball joint seats (14) on the piston side, and the first-stage and third-stage piston driving arms (15), and drives the second-stage piston (23) and the fourth-stage piston (25) to synchronously reciprocate linearly through the second-stage and fourth-stage ball joint seats (17) on the wobble plate side, the second-stage and fourth-stage driving connecting rods (18), the second-stage and fourth-stage ball joint seats (19) on the piston side, and the second-stage and fourth-stage piston driving arms (20); The guide rod portion of the first-stage piston driving arm (15), the guide rod portion of the second-stage piston driving arm (20), the piston rod of the first-stage piston (22), the piston rod of the second-stage piston (23), the piston rod of the third-stage piston (24) and the piston rod of the fourth-stage piston (25) respectively form a sliding pair with the corresponding linear bearing holes of the first-stage linear bearing group (16) and the second-stage linear bearing group (21) to provide guidance for reciprocating motion; the connecting line between the fixed position of the piston rod of the first-stage piston (22) and the piston rod of the third-stage piston (24) on the first-stage piston driving arm (15) and the fixed position of the first-stage ball joint seat (14) on the piston side is in a V shape, and the piston rod of the second-stage piston (23) and the fourth-stage piston (25) on the second-stage piston driving arm (20) are connected to the third-stage ball joint seat (14) on the piston side. ) and the fixed position of the second and fourth stage ball joint seats (19) on the piston side are also V-shaped, so that the pistons of each stage are more compact with each other to reduce the volume of the compressor; the two ends of the first and third stage piston driving arms (15) are respectively fixedly connected to the piston rod ends of the first stage piston (22) and the piston rod ends of the third stage piston (24), and the two ends of the second and fourth stage piston driving arms (20) are respectively fixedly connected to the piston rod ends of the second stage piston (23) and the piston rod ends of the fourth stage piston (25). The ends of the piston rods of each stage are provided with rectangular boss stoppers, and the connection between the piston driving arms and the piston rod ends is provided with rectangular recesses. The boss stoppers cooperate with the recesses to prevent the piston from rotating along its axis and facilitate the positioning of the piston rod ends when the piston driving arms are installed; The motor (1) drives the planetary gear (3) through the sun gear (2); the inner gear ring at the left end of the planetary reducer housing (4) meshes with the planetary gear (3); the spline shaft at the right end of the planetary carrier (5) is connected to the spline hole at the left end of the swing plate drive shaft (8), thereby realizing power transmission while reducing the space size required for the axial transmission connection; the planetary reducer housing (4) and the bearing seat (6) are designed with flange surfaces that can be connected on both sides, thereby ensuring a compact connection between the drive device and the compressor housing.

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