CN102788019A - Rotary compressor - Google Patents

Abstract

A rotary compressor, including a motor assembly and a pump body assembly arranged in the casing, the motor assembly is arranged above the pump body assembly, the motor assembly includes a stator and a rotor; the pump body assembly includes a cylinder, a The elliptical piston, the sliding vane arranged in the sliding vane groove of the cylinder, the rotating shaft driving the elliptical piston to rotate, and the main bearings and auxiliary bearings arranged on the upper and lower sides of the cylinder; the centerline of the elliptical piston overlaps with the centerline of the cylinder cavity There are two sliding vane grooves, each sliding vane groove is provided with a sliding vane, and one end of the vane is in contact with the outer circumference of the elliptical piston. When the compressor is running, the end of the sliding vane is close to the outer circumference of the elliptical piston. The invention has the advantages of simple and reasonable structure, stable and reliable operation, and low vibration and noise.

Description

rotary compressor

technical field

The present invention relates to a rotary compressor.

Background technique

The cam part of the crankshaft of the existing rotary compressor adopts an eccentric structure to achieve compression, but this eccentric structure will generate a large unbalanced force during operation, causing the compressor to vibrate. The current approach is to install balance weights at both ends of the rotor of the compressor to achieve force balance and torque balance. However, due to the influence of manufacturing accuracy and installation accuracy, it is impossible to completely eliminate the unbalanced force and unbalanced moment, and the balance weight and Since the force generated by the crankshaft is not on the same straight line, the crankshaft will be bent and deformed, resulting in severe bearing wear, and even affecting the gap between the stator and the rotor.

Chinese Patent Document No. CN1632310 disclosed a rotary compressor on June 29, 2005, comprising: a cylinder; a fixed crankshaft penetrating through the inside of the rotor; an upper bearing and a lower bearing supporting the crankshaft; There is a symmetrical part of the crankshaft in between, the symmetrical part of the crankshaft is symmetrical on both sides of the axis, and the part connected with the rolling ring is designed to be elliptical to ensure a close fit with the rolling ring; the inner surface of the rolling ring contacts the outer peripheral surface at one end of the symmetrical part of the crankshaft. The outer edge of the roller ring is designed to be elliptical, and the two endpoints of its long axis are in contact with the cylinder. The inner part of the roller ring that is connected to the symmetrical part of the crankshaft is designed to match the symmetrical shape of the crankshaft, so that it fits closely with the symmetrical part of the crankshaft. The elliptical surface of the outer circumference of the roller ring is in contact with the inner surface of the cylinder, and is driven by the rotation of the symmetrical part to perform revolution motion. However, the elliptical rolling ring of this structure divides the cylinder cavity into two sides, and the cavity on one side of the rolling ring is divided into the suction cavity and the exhaust cavity by a slide plate, while the cavity on the other side of the rolling ring is wasted. , reducing air conditioning efficiency.

Contents of the invention

The object of the present invention is to provide a rotary compressor with simple and reasonable structure, stable and reliable operation, and low vibration and noise, so as to overcome the deficiencies in the prior art.

A rotary compressor designed for this purpose includes a motor assembly and a pump body assembly arranged in the casing, the motor assembly is arranged above the pump body assembly, and the motor assembly includes a stator and a rotor; its structural feature is that the pump body assembly includes Cylinder, the elliptical piston arranged in the inner cavity of the cylinder, the sliding vane arranged in the sliding vane groove of the cylinder, the rotating shaft driving the elliptical piston to rotate, and the main bearings and auxiliary bearings arranged on the upper and lower sides of the cylinder; the centerline of the elliptical piston It overlaps with the center line of the inner cavity of the cylinder; there are two slide slots, each slide slot is provided with a slide, and one end of the slide is in contact with the outer circumference of the elliptical piston. When the compressor is running, the end of the sliding vane is close to the outer circumference of the elliptical piston.

The elliptical piston and the rotating shaft are integrally formed, and the two form a crankshaft, and the elliptical piston is an elliptical cam of the crankshaft; the elliptical cam is located at the bottom of the crankshaft, and its centerline overlaps with the crankshaft rotation centerline; the outer wall of the elliptical cam is in clearance fit with the inner wall of the cylinder. The gap is sealed and lubricated by an oil film.

The edge of the elliptical cam is provided with an elliptical boss, the upper and lower sides of the boss are respectively in contact with the main bearing and the auxiliary bearing, the lower side of the elliptical cam is provided with a shoulder thrust surface, and the crankshaft is supported on the auxiliary bearing through the shoulder thrust surface. superior.

The boss protrudes from the upper and lower sides of the elliptical cam; the shaft shoulder thrust surface protrudes from the lower side of the boss. The upper and lower sides of the boss are higher than the elliptical cam, and are in contact with the main and auxiliary bearings to prevent air leakage. The thrust surface of the shaft shoulder is slightly higher than the boss, which acts as a thrust and bears the weight of the rotor.

The slide plate and the elliptical cam divide the cylinder into four cavities; including the first suction cavity, the second suction cavity, the first exhaust cavity and the second exhaust cavity; the cylinder corresponds to the first and second suction chambers respectively. The air cavity is provided with air suction holes; the cylinder is respectively provided with exhaust holes corresponding to the first and second exhaust chambers.

The two suction holes, the two exhaust holes, and the two slide slots are arranged symmetrically; the suction holes and the exhaust holes are respectively located on both sides of the slide.

The elliptical piston and the rotating shaft are separately processed and formed, and the elliptical piston is radially positioned at the lower part of the rotating shaft; the outer wall of the elliptical piston is in clearance fit with the inner wall of the cylinder.

The long diameter and short diameter of the elliptical shape of the above-mentioned elliptical piston or elliptical cam can be arbitrarily set according to actual needs.

In the present invention, the cam (or piston) of the crankshaft is designed to be elliptical, and two suction holes, two exhaust holes and two sliding vane grooves are designed on the cylinder at the same time, and the cylinder is divided into four parts by using the elliptical cam and double sliding vanes. When the motor drives the rotating shaft to rotate counterclockwise at high speed, the elliptical cam also rotates, the two suction chambers inhale, and the two exhaust chambers compress the refrigerant gas. When a certain pressure is reached, the exhaust valve opens, and the high-pressure gas flows from the The exhaust port of the cylinder discharges. During the suction and compression process, the sliding plate is close to the outer circumference of the elliptical cam to realize the isolation of the suction cavity and the exhaust cavity. In addition, the elliptical cam is a symmetrical structure without unbalanced force, thereby achieving the purpose of reducing vibration. At the same time, it can also save the balance weight on the existing rotor and reduce the cost. It has simple and reasonable structure, stable and reliable operation, and low vibration and noise.

Description of drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic diagram of the bottom view of the pump body assembly.

Fig. 3 is a schematic diagram of the structure of the cylinder viewed from above.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1-Fig. 3, the rotary compressor includes a motor assembly and a pump body assembly arranged in the casing, the motor assembly is arranged above the pump body assembly, and the motor assembly includes a stator and a rotor. The pump body assembly includes a cylinder 6, an elliptical piston set in the inner cavity of the cylinder 6, a slide plate 3 set in the slide plate groove 6.1 of the cylinder 6, a rotating shaft driving the elliptical piston to rotate, and main bearings 2 set on the upper and lower sides of the cylinder 6 and the auxiliary bearing 4; the centerline of the elliptical piston overlaps with the centerline of the inner chamber of the cylinder 6; two slide grooves 6.1 are provided, each slide groove 6.1 is provided with a slide 3, and one end of the slide 3 In contact with the outer circumference of the oval piston. The elliptical piston and the rotating shaft are integrally formed, and the two form a crankshaft 1. The elliptical piston is the elliptical cam 5 of the crankshaft 1; 6 Inner wall clearance fit.

The edge of the elliptical cam 5 is provided with an elliptical boss 5.1, the upper and lower sides of the boss 5.1 are respectively in contact with the main bearing 2 and the auxiliary bearing 4, and the lower side of the elliptical cam 5 is provided with a shoulder thrust surface 5.2, and the crankshaft 1 passes through the shoulder to stop. The push surface 5.2 is supported on the auxiliary bearing 4. The boss 5.1 protrudes from the upper and lower sides of the elliptical cam 5; the shaft shoulder thrust surface 5.2 protrudes from the lower side of the boss 5.1.

The slide plate 3 and the elliptical cam 5 divide the cylinder 6 into four cavities; including the first air suction chamber I, the second air suction chamber III, the first exhaust chamber II and the second exhaust chamber IV; the cylinders correspond to the first 1. The second air suction cavity is provided with an air suction hole 6.2; the cylinder is respectively provided with an exhaust hole 6.3 corresponding to the first and second exhaust chambers. Two suction holes 6.2, two exhaust holes 6.3, and two slide slots 6.1 are arranged symmetrically;

Claims (7)

1. a rotary compressor comprises the electric machine assembly and the pump assembly that are arranged in the housing, and electric machine assembly is arranged on the top of pump assembly, and electric machine assembly comprises stator and rotor; It is characterized in that pump assembly comprise cylinder (6), be arranged on cylinder (6) inner chamber oval piston, be arranged on slide plate (3) in cylinder (6) vane slot (6.1), drive the rotating shaft of oval piston rotation, and be arranged on cylinder (6) main bearing of both sides (2) and supplementary bearing (4) up and down; The center line of the center line of said oval piston and cylinder (6) inner chamber is overlapping; Said vane slot (6.1) is provided with two, is provided with slide plate (3) in each vane slot (6.1), and slide plate (3) one ends contact with the oval piston periphery.

2. rotary compressor according to claim 1 is characterized in that said oval piston and rotating shaft are one-body molded, and both constitute a bent axle (1), and oval piston is the elliptic cam (5) of bent axle (1); Elliptic cam (5) is positioned at the bottom of bent axle (1), its center line and bent axle (1) rotating center line overlap; Elliptic cam (5) outer wall and cylinder (6) inwall Spielpassung.

3. rotary compressor according to claim 2; It is characterized in that said elliptic cam (5) edge is provided with oval-shaped boss (5.1); Boss (5.1) both sides up and down contacts with supplementary bearing (4) with main bearing (2) respectively; Elliptic cam (5) downside is provided with shaft shoulder thrust surface (5.2), and bent axle (1) is bearing on the supplementary bearing (4) through shaft shoulder thrust surface (5.2).

4. rotary compressor according to claim 3 is characterized in that said boss (5.1) protrudes from the side up and down of elliptic cam (5); Shaft shoulder thrust surface (5.2) protrudes from the downside of boss (5.1).

5. according to each described rotary compressor of claim 2-4, it is characterized in that said slide plate (3) and elliptic cam (5) are with being divided into four cavitys in the cylinder (6); Comprise first air aspiration cavity (I), second air aspiration cavity (III), first exhaust cavity (II) and second exhaust cavity (IV); Corresponding respectively first, second air aspiration cavity of cylinder is provided with suction port (6.2); Corresponding respectively first, second exhaust cavity of cylinder is provided with exhaust port (6.3).

6. rotary compressor according to claim 5 is characterized in that said two suction ports (6.2), two exhaust ports (6.3), two vane slots (6.1) symmetric arrangement respectively; Suction port (6.2) and exhaust port (6.3) lay respectively at slide plate (3) both sides.

7. rotary compressor according to claim 1 is characterized in that the independent machine shaping of said oval piston and rotating shaft, and the oval piston radial location is arranged on the rotating shaft bottom; Oval piston outer wall and cylinder (3) inwall Spielpassung.

Images