JP3182593B2 - 2-cylinder rotary compressor - Google Patents

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 refrigerant gas in a refrigeration system or an air conditioner.

[0002]

2. Description of the Related Art Conventionally, this type of two-cylinder rotary compressor generally has a structure as disclosed in Japanese Patent Application Laid-Open No. 63-38691. Hereinafter, the configuration will be described with reference to FIGS.

In FIG. 3, reference numeral 21 denotes a closed container, in which a drive element 22 is housed. The compressor element 23 is driven by the rotation shaft 22a of the drive element 22. Cylinders 25 and 26 are provided on both upper and lower sides of a partition plate 24 of the compressor element 23. In addition, a crankshaft eccentric portion 27 is provided in the cylinder 25, and a crankshaft eccentric portion 28 is also stored in the cylinder 26.

The two eccentric portions 27 and 28 of the crankshaft are
2a, and rolling pistons 29, 30 are respectively provided on the crankshaft eccentric portions 27, 28.
Is rotatably mounted. The rolling pistons 29 and 30 are housed in cylinders 25 and 26, respectively. Although not shown, vanes are provided in the cylinders 25 and 26 in contact with the rolling pistons 29 and 30, respectively. Gas suction holes 31, 3 are provided in the cylinders 25, 26, respectively.
2 are provided. In these suction holes 31, 32,
Independent suction pipes 33 and 34 are connected. The suction pipes 33 and 34 communicate with the cylinder chambers 35 and 36 through the suction holes 31 and 32, respectively. Furthermore, partition plate 2
4, a central hole 37 is provided at the center of the crankshaft 4, and as shown in FIG. The two crankshaft eccentric portions 27, 2
8 can be assembled by being inserted from any of the upper and lower directions.

In the two-cylinder rotary compressor constructed as described above, when the drive element 22 is energized and its rotary shaft 22a rotates, the crankshaft eccentric portions 27, 28
5 and 26, eccentric rotation and rolling piston 2
The cylinders 9 and 30 rotate while contacting a vane (not shown).
At 6, the suction and compression of the refrigerant gas are repeated. These two cylinders 25 and 26 have respective suction pipes 33 and
The refrigerant gas is sucked through the suction holes 31 and 32.

[0006]

However, in the above-described two-cylinder rotary compressor, since the crankshaft eccentric portions 27 and 28 are formed to have the same diameter and are opposed by 180 degrees, the eccentricity e0 is reduced. The diameter cannot be made larger than (d0-d1) / 2 constituted by the eccentric part diameter d0 and the shaft diameter d1 of the upper and lower bearings, and there is a problem that the refrigerating capacity is reduced.

The diameter D0 of the central hole 37 of the partition plate 24 is
Is smaller than the diameter d0 of the crankshaft eccentric portions 27 and 28, the above problem can be solved. However, it is impossible to assemble the partition plate 24 unless the partition plate 24 is divided or the productivity is greatly reduced. there were.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to increase the amount of eccentricity of the crankshaft portion without increasing the manufacturability, thereby increasing the refrigerating capacity.

[0009]

In order to achieve the above object, a two-cylinder rotary compressor according to the present invention comprises a closed container, a noise element having an electric motor in the closed container, and a partition driven by the drive element. 2 arranged axially through a plate
Two compressor elements, a crankshaft eccentric part integrally formed with a rotary shaft rotated by a cylinder and the drive element in each of the compressor elements, and an eccentric rotation in the cylinder together with the eccentric part of the crankshaft. The crankshaft has two eccentric portions having the same eccentric direction, the same eccentric amount, and the same outer diameter. The shaft diameter of the upper bearing portion is larger than the shaft diameter of the lower bearing portion, the direction of the suction hole of the cylinder of each compression element is shifted by 180 degrees, and the inner diameter of the upper cylinder and the lower cylinder are different from each other. Are formed in different diameters.

[0010]

According to the present invention, the eccentricity of the eccentric portion of the crankshaft is increased in this configuration, thereby increasing the refrigerating capacity and processing the eccentric portion of the shaft in the same direction. Performance will be improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a longitudinal sectional view of a two-cylinder rotary compressor according to the present invention, and FIG. 2 is an enlarged sectional view of a main part thereof.

In FIG. 1, reference numeral 1 denotes a closed container, in which a driving element 2 is housed. The compressor element 3 is driven by the rotation shaft 2a of the drive element 2. Cylinders 5 and 6 are arranged above and below a partition plate 4 of the compressor element 3. The above configuration and arrangement are the same as in the conventional example.

In this embodiment, as shown in FIG. 2, the inner peripheral diameters of the upper and lower cylinders 5 and 6 are formed to have different dimensions D1 and D2, respectively, and the shaft diameter d1 of the upper bearing portion of the rotary shaft 2a.
And the shaft diameter d2 of the lower bearing portion are formed with different diameters, and the eccentric portions 7 and 8 of each crankshaft are formed in the same eccentric direction and the same eccentric amount e.
1, formed with the same outer diameter d0. The eccentric portions 7, 8 of the respective crankshafts are provided via the respective rolling pistons 9, 10. Particularly, the shaft diameter d1 of the upper bearing is formed larger than the shaft diameter d2 of the lower bearing. 11, 1
2 is a suction hole of the cylinder of each compression element 3, 4 and its direction
Are shifted by 180 degrees.

Next, the relationship between the conventional one shown in FIG. 3 and the crankshaft eccentric part of the embodiment of the present invention shown in FIG. 1 will be described. Conventional crankshaft eccentric part 2
The upper rolling piston 29 can be inserted only from the upper side and the lower rolling piston 30 can be inserted only from the lower side since the outer rings 7 and 28 are opposed by 180 degrees and have the same outer diameter d0.
Was not larger than (d0-d1) / 2, and there was a problem that the refrigerating capacity could not be increased. On the other hand, the crankshaft eccentric portions 7 and 8 is the same direction of eccentricity of the present invention, the same eccentricity e1, and as a same outer diameter d0, the shaft diameter of the upper bearing portion size comb than the shaft diameter of the lower bearing portion And each cylinder 5, 6
Of the eccentricity e1 by making the inner peripheral diameters D1 and D2 of
Can be made larger than the conventional eccentricity e0.

Accordingly, the refrigeration capacity can be increased from the above. In other words, in order to obtain the same refrigeration capacity, the volume of the cylinder chamber can be reduced, and the size and weight can be reduced.

[0017]

As is apparent from the above description, according to the present invention, the two eccentric portions of the crankshaft have the same eccentric direction, the same amount of eccentricity, and the same outer diameter, and the upper bearing portion of the rotary shaft is formed. The shaft diameter is larger than the shaft diameter of the lower bearing part, the direction of the suction hole of the cylinder of each compressor element is shifted by 180 degrees, and the inner diameters of the upper cylinder and the lower cylinder are different. Due to the diameter, the eccentricity of the eccentric portion of the crankshaft can be increased to increase the refrigerating capacity.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view of an essential part of the two-cylinder rotary compressor.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Drive element 2a Rotating shaft 3 Compressor element 4 Partition plate 5,6 Cylinder 7,8 Eccentric part 9,10 Rolling piston 11,12 Suction hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-105992 (JP, A) JP-A-5-10279 (JP, A) JP-A-60-128991 (JP, A) JP-A-5-105 99171 (JP, A) JP-A-3-26893 (JP, A) JP-A-63-38691 (JP, A) JP-A-8-21390 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 23/00-29/10 331

Claims (1)

(57) [Claims] An airtight container, a drive element having an electric motor in the airtight container, and two compressor elements driven by the drive element and arranged in an axial direction via a partition plate;
A crankshaft eccentric part integrally formed with a rotary shaft rotated by a cylinder and the drive element in each of the compressor elements; a rolling piston eccentrically rotating in the cylinder together with the eccentric part of the crankshaft; A suction hole connected to a cylinder for introducing refrigerant;
The two eccentric portions have the same eccentric direction, the same eccentric amount, and the same outer diameter, and the shaft diameter of the upper bearing portion of the rotating shaft is the shaft diameter of the lower bearing portion.
Was larger, also the shifted 180 degrees in the direction of suction hole of the cylinder of the compression element, and to form an inner circumference of the inner circumference and the lower cylinder of the upper cylinder different diameters 2
Cylinder rotary compressor.