JPH0821390A - Two-air cylinder rotary compressor - Google Patents

Abstract

PURPOSE:To improve refrigerating capacity by enlarging the rotational eccentricity of a piston between an upper stage compression chamber and a lower stage compression chamber. CONSTITUTION:The outer diameter d1 on the upper end plate side of a rotary shaft and the outer diameter d2 of the lower end plate side thereof are made to have different valves, and the bolt pitches of the cylinder 5, 6 of respective compressive elements are xisymmetrically made, further the directions of the intake holes of the cylinders 5, 6 of respective compressive elements are formed to be shifted by 180 deg. from each other. By this construction, the volume of each cylinder chamber for obtaining the same refrigerating capacity can be diminished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-cylinder rotary compressor for compressing a refrigerant gas in a refrigeration system or an air conditioner.

[0002]

2. Description of the Related Art This is based on the one disclosed in Japanese Patent Publication No. 63-104189.

An already proposed two-cylinder rotary compressor of this type is constructed as shown in FIGS. 3 and 4.

That is, in FIG. 3 and FIG. 4, reference numeral 1 denotes an airtight container in which an electric element 2 is housed.

The compression element 3 is driven by a vertical drive shaft 2a of the electric element 2. This compression element 3
Cylinders 5 and 6 are arranged on both upper and lower sides of the partition plate 4.

A crankshaft eccentric portion 7 is arranged in the cylinder 5, and a crankshaft eccentric portion 8 is also housed in the cylinder 6.

The crankshaft eccentric parts 7 and 8 are integrally formed with the drive shaft 2a.
Rolling pistons 9 and 10 are rotatably mounted on each of the above.

The rolling pistons 9 and 10 are housed in cylinders 5 and 6, respectively.

Although not shown in the drawings, vanes are provided in the cylinders 5 and 6 in contact with the rolling pistons 9 and 10, respectively. Gas suction passages 11 and 12 are provided in the cylinders 5 and 6, respectively.

Intake pipes 13 and 14 independent from each other are connected to the intake passages 11 and 12, respectively. Suction pipes 13 and 14 are connected to the suction passages 11 and 12, respectively.

The suction pipes 13 and 14 are connected to the suction passage 11,
12 communicates with the suction chambers 18, 19. Further, a central hole 17 is provided in the central portion of the partition plate 4, and the hole diameter D0 of the central hole 17 is slightly smaller than the outer diameter d0 of the crankshaft eccentric portions 7 and 8 at the time of assembly. The central hole 17 is formed in a large size so that it can be assembled by inserting both the crankshaft eccentric parts 7 and 8 from any direction during assembly.

In the two-cylinder rotary compressor constructed as described above, when the electric element 2 is energized and the drive shaft 2a thereof rotates, the crankshaft eccentric parts 7, 8 move into the cylinders 5, 6, respectively.
The cylinders eccentrically rotate inside, and the rolling pistons 9 and 10 rotate while abutting on vanes (not shown), and the refrigerant gas is repeatedly sucked and compressed in the cylinders 5 and 6 in a cycle shifted by half a rotation. Both cylinders 5, 6
The suction pipes 13, 14 and the suction passages 11, 1 respectively.
Refrigerant gas is drawn in through 2.

[0013]

However, in the above-described hermetic rotary compressor, the crankshaft eccentric portions 7 and 8 are formed to have the same diameter, and the eccentric portion diameter d0 is provided because they are opposed by 180 °. The eccentricity cannot be made larger than (d0-d1) / 2 constituted by the shaft diameters d1 on the upper end plate side and the lower end plate side, so that there is a problem that the refrigerating capacity decreases.

Further, if the diameter of the central hole 17 of the partition plate 4 is made smaller than the diameter of the crankshaft eccentric parts 7 and 8, the above problems can be solved, but conversely the partition plate 4 is not assembled. However, there is a problem in that the productivity is significantly reduced.

The present invention has been made based on the above circumstances, and provides a hermetic rotary compressor capable of increasing the refrigerating capacity by increasing the eccentricity of the crankshaft without lowering the manufacturability. The purpose is to do.

[0016]

SUMMARY OF THE INVENTION According to the present invention, two compressor elements driven by a drive element having an electric motor are axially arranged in a closed container, and each of the compressor elements has a cylinder and the drive. A shaft that rotates by an element and that has an eccentric portion, a rolling piston that is rotatably provided on this eccentric portion, and that rotates eccentrically in the cylinder together with the eccentric portion of the shaft, and is slidable on the cylinder Inserted into the compression chamber and the suction chamber to partition the compression chamber and the suction chamber, an elastic body for pressing the vane against the rolling piston, a suction hole for introducing the compressed refrigerant, a discharge hole for discharging the compressed refrigerant, and the discharge hole. Discharge valve devices for opening and closing are respectively provided, and further, end plates having bearing portions for the shafts and fastening portions for connecting the both end plates and the compressor element are provided at both axial ends of each compressor element. Cylinder type A ring piston type rotary compressor is configured, and the eccentric portion of the shaft has the same eccentric direction, the same eccentric amount, and the same outer diameter, and the outer diameter of the upper end plate side and the outer diameter of the lower end plate side of the shaft are The cylinders of the compression elements have different diameters, the bolt pitches of the cylinders of the compression elements are axially symmetric, and the suction holes of the cylinders of the compression elements are shifted by 180 °.

[0017]

With this construction, the eccentricity of the shaft eccentric portion can be increased to increase the refrigerating capacity, and since the shaft eccentric portion is machined in the same direction, manufacturing productivity is improved. It is intended to improve.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an illustrated embodiment.

Since the overall structure of the two-cylinder rotary compressor of the present invention is the same as that of the conventional example described above, the description thereof will be omitted and only the structure of the main part will be described.

In FIG. 2, the rotary shaft 2a in which the cylinder chambers 18 and 19 in which the inner peripheral diameters of both cylinders 5 and 6 are formed to be D are located are formed with different diameters on the upper end plate side. The crankshaft eccentric portions 7 and 8 formed with the same eccentric direction, the same eccentric amount, and the same outer diameter as the outer diameter of the lower end plate side are provided via the rolling pistons 9 and 10.

Particularly, the outer diameter d1 on the upper end plate side is formed larger than the outer diameter d2 of the lower end plate.

Next, the relationship between the crankshaft eccentric parts of the conventional structure shown in FIG. 3 and the embodiment of the present invention shown in FIG. 1 will be described.

Since the conventional eccentric parts of the crankshafts are opposed to each other by 180 °, the upper rolling piston can be inserted only from the upper end plate side and the lower rolling piston can be inserted only from the lower end plate side. Therefore, the eccentric amount is (d0-d1). ) / 2, the refrigerating capacity cannot be increased.

On the other hand, the crankshaft eccentric portions of the present invention have the same eccentric direction, the same eccentric amount, and the same outer diameter, and the outer diameter on the upper end plate side is smaller than the outer diameter of the lower end plate. The amount of eccentricity can be increased as compared with the conventional one.

Therefore, as is apparent from the above, according to the present invention, the crankshaft eccentric portions have the same eccentric direction, the same eccentric amount, and the same outer diameter under the same cylinder chamber size. By doing so, the amount of eccentricity can be increased and the refrigerating capacity can be increased. In other words, the volume of the cylinder chamber can be reduced and the size and weight can be reduced to obtain the same refrigerating capacity.

[0026]

As described above, according to the present invention, two compressor elements driven by a drive element having an electric motor are axially arranged in a closed container, and a cylinder is provided in each of the compressor elements. And a shaft which is rotated by the drive element and has an eccentric portion, a rolling piston which is rotatably provided on the eccentric portion, and rotates eccentrically in the cylinder together with the eccentric portion of the shaft, and A vane that is slidably inserted to partition the compression chamber and the suction chamber, an elastic body that presses the vane against the rolling piston, a suction hole that introduces a compressed refrigerant, and a discharge hole that discharges the compressed refrigerant. Discharge valve devices for opening and closing the discharge holes are provided,
Furthermore, a two-cylinder type rolling piston rotary compressor is configured by providing end plates having bearing portions for the shaft and fastening portions connecting the both end plates and the compressor element at both axial ends of each compressor element. The eccentric portion of the shaft has the same eccentric direction, the same eccentric amount, and the same outer diameter, the outer diameter of the upper end plate side and the outer diameter of the lower end plate side of the shaft are different, and The bolt pitch of the cylinder of the element is made axisymmetric, and the direction of the suction hole of the cylinder of each compression element is shifted by 180 °.

With this configuration, it is possible to increase the eccentricity of the eccentric portion of the shaft to increase the refrigerating capacity, and since the eccentric portion of the shaft is machined in the same direction, manufacturing productivity is improved. It is intended to improve.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a two-cylinder rotary compressor according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of a two-cylinder rotary compressor according to the present invention.

FIG. 3 is a vertical sectional view of a conventional two-cylinder rotary compressor.

FIG. 4 is an enlarged sectional view of a main part of a conventional two-cylinder rotary compressor.

[Explanation of symbols]

 1 Airtight container 2 Electric element 2a Drive shaft 3 Compression element 4 Partition plate 5 Cylinder 6 Cylinder 7 Crankshaft eccentric part 8 Crankshaft eccentric part 9 Rolling piston 10 Rolling piston 11 Suction passage 12 Suction passage 13 Suction pipe 14 Suction pipe 17 Central hole 18 Cylinder chamber 19 Cylinder chamber

Claims (1)

[Claims] 1. A hermetically sealed container in which two compressor elements driven by a drive element having an electric motor are axially arranged via partition plates, and each compressor element is rotated by a cylinder and the drive element. A shaft having an eccentric portion, and a rolling piston rotatably provided on the eccentric portion and rotating eccentrically in the cylinder together with the eccentric portion of the shaft,
A vane that is slidably inserted into the cylinder and partitions the compression chamber and the suction chamber; an elastic body that presses the vane against the rolling piston; and a suction hole that introduces a compressed refrigerant.
Discharge holes for discharging the compressed refrigerant and discharge valve devices for opening and closing the discharge holes are respectively provided, and further, end plates having bearing portions for the shafts are provided at both axial ends of each compressor element,
A two-cylinder type rolling piston type rotary compressor is provided by providing a fastening portion connecting the both end plates and the compressor element, and the eccentric portions of the shaft have the same eccentric direction, the same eccentric amount, and the same outer diameter,
The outer diameter of the shaft on the upper end plate side and the outer diameter on the lower end plate side are different from each other, the bolt pitch of the cylinder of each compression element is axisymmetric, and the direction of the suction hole of the cylinder of each compression element is further determined. Is 180 degrees apart 2
Cylinder rotary compressor.