A star compressor

Abstract

This utility model discloses a rotary compressor, in which a roller shaft is rotatably mounted within a housing. An upper drive disc is located at the top of the roller shaft, and a lower guide disc is located at the bottom. The circumferential sidewall of the upper drive disc alternately features a power section and a retraction section. A raceway is formed on the lower guide disc, within which several rollers are connected. One end of each roller is connected to a connecting rod, and the other end of the connecting rod passes through the sidewall of the housing and connects to a piston. The connecting rod drives the piston to reciprocate in corresponding cylinders. Multiple cylinders are located on the same plane. A linear bearing is installed at the connection between the connecting rod and the housing. The raceway includes alternating main and secondary raceways. The power section of the upper drive disc drives the rollers to move within the main raceway to achieve linear power from the connecting rod. The secondary raceway, through the rollers, drives the connecting rod to retract after linear power is achieved. This utility model, through the rolling contact between the rollers and the raceway, effectively improves mechanical efficiency compared to traditional crank-connecting rod mechanisms while reducing energy loss.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a rotary compressor. Background Technology

[0002] In the field of compressor technology, traditional crankshaft structures typically employ multi-crankshaft or eccentric wheel designs, forming a sliding friction pair with the connecting rod bearings and the connecting rod big end. This structure presents the following technical problems: 1. Connecting rod bearing wear: The sliding friction between the traditional connecting rod big end and the crankshaft pin relies on connecting rod bearing lubrication. Long-term operation can easily lead to bearing erosion, increased clearance, and high maintenance costs; 2. Motion guidance defects: The connecting rod is only constrained by the crankshaft pin, which can easily cause lateral wobble during reciprocating motion, resulting in uneven wear between the piston and cylinder, and a persistently high leakage rate; 3. Limited structural layout: Multi-cylinder compressors typically use radial or axial arrangements, resulting in a large overall size, and the phase difference between the working cylinders is difficult to control precisely, leading to significant vibration and noise.

[0003] In the existing technology, some compressors have attempted to use a disc-type transmission mechanism, but the following problems are common: the contact stress between the disc shaft and the roller is concentrated, resulting in a short fatigue life; the connecting rod motion trajectory lacks effective constraint, which easily causes the mechanism to jam; and the return section is poorly designed, resulting in high energy consumption during the piston return stroke. Utility Model Content

[0004] The purpose of this invention is to provide a rotary compressor to solve the aforementioned problems in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model provides a rotary compressor, comprising a housing, a roller shaft, rollers, a connecting rod, and a linear bearing. The roller shaft is rotatably mounted within the housing. An upper drive disc is disposed on the upper part of the roller shaft, and a lower guide disc is disposed on the lower part. The circumferential sidewall of the upper drive disc alternately has a working section and a retraction section. A raceway is formed on the lower guide disc, and a plurality of rollers are fitted within the raceway. Each roller is connected to one end of the connecting rod, and the other end of the connecting rod passes through the sidewall of the housing and is connected to a piston. The connecting rod can drive the piston to move in corresponding directions. The cylinders reciprocate within the cylinder, with multiple cylinders located on the same plane. A linear bearing is installed at the connection between the connecting rod and the outer casing. The raceway includes alternating main and secondary raceways. The curvature of the main raceway matches the curvature of the working section, and the curvature of the secondary raceway matches the curvature of the retraction section. The working section of the upper drive disc drives the rollers to move within the main raceway to achieve linear work by the connecting rod. The secondary raceway, through the rollers, drives the connecting rod to retract after linear work, thus enabling the connecting rod to complete the reciprocating motion.

[0007] Furthermore, the main raceway and the secondary raceway are concentrically arranged raceways, and there is a smooth transition between the main raceway and the secondary raceway.

[0008] Furthermore, one end of the connecting rod is provided with a connecting part, which is snapped onto the outer ring of the roller. A fixing ring is fixedly connected to the connecting part, and the roller passes through the fixing ring and then engages with the raceway.

[0009] Furthermore, the number of the working section and the retraction section are both four, and the number of the connecting rod and the roller are both six.

[0010] Furthermore, one end of the roller shaft extends outward through the outer casing and is connected to a driving component, which is used to drive the roller shaft to rotate.

[0011] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0012] The rotary compressor provided by this utility model eliminates the sliding friction pair between the traditional connecting rod bearing and crankshaft pin, and adopts a rolling contact mechanism between rollers and raceways, changing the friction type from sliding friction to rolling friction. The mechanical efficiency is effectively improved compared with the traditional crank-connecting rod mechanism. At the same time, the design of matching the arc of the main raceway with the arc of the power section and the arc of the secondary raceway with the arc of the return section ensures that the roller motion trajectory is highly consistent with the force direction of the connecting rod, reducing energy loss. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the main structure of the rotary compressor of this utility model;

[0015] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0016] Figure 3 This is a top view of the rotary compressor of this utility model.

[0017] Explanation of reference numerals in the attached drawings: 1. Outer shell; 2. Roller shaft; 21. Upper drive disc; 211. Working section; 212. Retraction section; 22. Lower guide disc; 3. Raceway; 31. Main raceway; 32. Secondary raceway; 4. Roller; 5. Connecting rod; 51. Connecting part; 52. Retaining ring; 6. Linear bearing. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the terms "length," "width," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] The technical solutions provided by the embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0022] like Figures 1 to 3 As shown, the rotary compressor of this embodiment includes a housing 1, a roller shaft 2, rollers 4, a connecting rod 5, and a linear bearing 6. The roller shaft 2 is rotatably installed inside the housing 1. An upper drive disk 21 is provided on the upper part of the roller shaft 2, and a lower guide disk 22 is provided on the lower part. The circumferential sidewall of the upper drive disk 21 is alternately provided with a working section 211 and a retraction section 212. A raceway 3 is provided on the lower guide disk 22. Several rollers 4 are connected in the raceway 3. One end of the roller 4 is connected to the connecting rod 5. The other end of the connecting rod 5 passes through the sidewall of the housing 1 and is connected to a piston. The connecting rod 5 can drive the piston to reciprocate in the corresponding cylinder. Multiple cylinders are located on the same plane. A linear bearing 6 is provided at the connection between the connecting rod 5 and the housing 1. The linear bearing 6 provides axial constraint on the connecting rod 5, which can eliminate lateral wobble in the reciprocating motion and avoid uneven wear between the piston and the cylinder.

[0023] Depending on the model of the rotary compressor, the number of connecting rods 5 and rollers 4 can be set differently, preferably in a complex symmetrical distribution.

[0024] Specifically, the raceway 3 includes an alternately arranged main raceway 31 and auxiliary raceway 32. The curvature of the main raceway 31 is adapted to the curvature of the working section 211, and the curvature of the auxiliary raceway 32 is adapted to the curvature of the retraction section 212. The working section 211 of the upper drive disk 21 drives the roller 4 to move within the main raceway 31 to achieve linear work of the connecting rod 5. The auxiliary raceway 32 drives the connecting rod 5 to retract after linear work through the roller 4, so that the connecting rod 5 completes reciprocating motion.

[0025] The use of rolling contact between rollers 4 and raceways 3 to replace the traditional sliding friction pair transforms the friction type from sliding friction to rolling friction, which can significantly reduce energy loss. Furthermore, the design of matching the curvature of the main raceway 31 with that of the working section 211 and the curvature of the secondary raceway 32 with that of the return section 212 ensures that the motion trajectory is highly consistent with the force direction, further improving mechanical efficiency.

[0026] Furthermore, the main raceway 31 and the auxiliary raceway 32 are concentrically arranged raceways 3, and the transition between the main raceway 31 and the auxiliary raceway 32 is smooth, which can eliminate motion impact and reduce overall machine vibration and noise. Preferably, the curvature of the main raceway 31 and the auxiliary raceway 32 is a curve composed of multiple R-arcs or oblique lines determined by the operating conditions.

[0027] In this embodiment, one end of the connecting rod 5 is provided with a connecting part 51, which is snapped onto the outer ring of the roller 4. The connecting part 51 is fixedly connected to a fixing ring 52. The roller 4 passes through the fixing ring 52 and is connected to the raceway 3. The combination of the snap-fit ​​connecting part 51 and the fixing ring 52 can improve the assembly accuracy of the connecting rod 5 and the roller 4 and enhance the running stability.

[0028] Preferred, such as Figure 3 As shown, there are four power sections 211 and four retraction sections 212, and six connecting rods 5 and six rollers 4. All cylinders are arranged in a coplanar layout, which, combined with the symmetrical distribution of the six connecting rods 5, effectively balances the reciprocating inertial force.

[0029] Furthermore, one end of the roller shaft 2 extends outward through the outer casing 1 and is connected to a drive component, which is used to drive the roller shaft 2 to rotate.

[0030] In this embodiment, the rotary compressor first rotates the roller shaft 2 via an external drive component, causing the upper drive disk 21 and the lower guide disk 22 to rotate synchronously. The working section 211 of the upper drive disk 21 rotates with the roller shaft 2, contacts the roller 4, and applies radial thrust. At this time, the roller 4 moves along the main raceway 31 of the lower guide disk 22 under the action of thrust. Since the curvature of the main raceway 31 is perfectly matched with the curvature of the working section 211, it can be ensured that the movement trajectory of the roller 4 is consistent with the axial direction of the connecting rod 5. The roller 4 moves along the main raceway 31 of the lower guide disk 22 under the action of thrust. The snap-fit ​​connection 51 of rod 5 transmits the thrust to connecting rod 5. Under the axial constraint of linear bearing 6, connecting rod 5 drives piston to complete compression work in cylinder. Then, the retraction section 212 of upper drive disk 21 rotates to the contact position with roller 4. At this time, roller 4 enters the secondary raceway 32 of lower guide disk 22. The curvature of secondary raceway 32 matches the curvature of retraction section 212. Through smooth transition, roller 4 is guided to move in the opposite direction, driving connecting rod 5 to retract. Piston returns to the initial position, completing a complete reciprocating cycle.

[0031] This utility model of a rotary compressor eliminates the traditional sliding friction pair between the connecting rod bearing and the crankshaft pin, and adopts a rolling contact mechanism between rollers and raceways, changing the friction type from sliding friction to rolling friction. This effectively improves mechanical efficiency compared to the traditional crank-connecting rod mechanism. At the same time, the design of matching the arc of the main raceway with the arc of the power section and the arc of the secondary raceway with the arc of the return section ensures that the roller motion trajectory is highly consistent with the force direction of the connecting rod, reducing energy loss.

[0032] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A rotary compressor, characterized in that, The system includes a housing, a roller shaft, rollers, a connecting rod, and a linear bearing. The roller shaft is rotatably mounted within the housing. An upper drive disc is located at the top of the roller shaft, and a lower guide disc is located at the bottom. The circumferential sidewall of the upper drive disc alternately has a working section and a retraction section. The lower guide disc has a raceway, within which several rollers are fitted and connected. Each roller is connected to one end of the connecting rod, and the other end of the connecting rod passes through the sidewall of the housing and is connected to a piston. The connecting rod drives the piston to reciprocate within a corresponding cylinder. Multiple cylinders are located on the same plane. A linear bearing is provided at the connection between the connecting rod and the outer casing. The raceway includes alternating main raceways and secondary raceways. The curvature of the main raceway matches the curvature of the working section, and the curvature of the secondary raceway matches the curvature of the retraction section. The working section of the upper drive disc drives the roller to move within the main raceway to achieve linear work of the connecting rod. The secondary raceway drives the connecting rod to retract after linear work through the roller, so that the connecting rod completes reciprocating motion.

2. A rotary compressor according to claim 1, characterized in that, The main raceway and the secondary raceway are concentrically arranged, and there is a smooth transition between the main raceway and the secondary raceway.

3. A rotary compressor according to claim 1, characterized in that, One end of the connecting rod is provided with a connecting part, which is snapped onto the outer ring of the roller. A fixing ring is fixedly connected to the connecting part, and the roller passes through the fixing ring and is connected to the raceway.

4. A rotary compressor according to claim 1, characterized in that, The number of the working section and the retraction section are both four, and the number of the connecting rod and the roller are both six.

5. A rotary compressor according to any one of claims 1-4, characterized in that, One end of the roller shaft passes through the outer casing and extends outward, and is connected to a driving component. The driving component is used to drive the roller shaft to rotate.

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