JP3123125B2 - 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 multi-cylinder rotary compressor for compressing refrigerant gas in a refrigeration system or an air conditioner.

[0002]

2. Description of the Related Art A two-cylinder rotary compressor of this type which has been proposed and is similar to that disclosed in Japanese Patent Publication No. 63-38691 is constructed as shown in FIGS.

[0003] That is, in FIGS. 3 and 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 2 a of the electric element 2. This compression element 3
The cylinders 5 and 6 are disposed on both upper and lower sides of the partition plate 4.

A crankshaft eccentric part 7 is disposed in the cylinder 5, and a crankshaft eccentric part 8 is similarly accommodated in the cylinder 6.

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

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

Although not shown, vanes are provided in the cylinders 5 and 6 in contact with the rolling pistons 9 and 10, respectively. In each of the cylinders 5 and 6, a gas is provided with a suction passage 11, 12 respectively.

These suction passages 11 and 12 are connected to suction pipes 13 and 14 which are independent from each other. 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 passages 11 and
It communicates with suction chambers 18 and 19 through 12. Further, a center hole 17 is provided in the center of the partition plate 4, and the hole diameter D0 of the center hole 17 is slightly smaller than the outer diameter d0 of the crankshaft eccentric portions 7, 8 when independent. The central hole 17 is formed large, and can be assembled by inserting the two crankshaft eccentric portions 7, 8 from any direction during assembly.

In the two-cylinder rotary compressor constructed as described above, when the electric element 2 is energized and its drive shaft 2a rotates, the crankshaft eccentric parts 7, 8 are moved to the cylinders 5, 6
The rolling pistons 9 and 10 rotate while contacting vanes (not shown), and the suction and compression of the refrigerant gas are repeated in the two cylinders 5 and 6 at a period shifted by half a rotation, respectively. These cylinders 5, 6
Have suction pipes 13 and 14 suction passages 11 and 12 respectively.
The refrigerant gas is sucked through.

[0012]

However, in the above-described hermetic rotary compressor, the eccentric portions 7, 8 of the crankshafts are formed to have the same diameter, and the crankshaft eccentric portions 7, 8 are opposed to each other by 180 °. The eccentricity could not be made larger than (d0-d1) / 2 constituted by the shaft diameter d1 of the upper and lower plates and the lower plate, so that the refrigerating capacity was reduced.

If the diameter of the central hole 17 of the partition plate 4 is made smaller than the diameter of the crankshaft eccentric portions 7 and 8, the above disadvantages can be solved, but if the partition plate 4 is not divided. There is a problem that the assembly cannot be performed, and the productivity is greatly reduced.

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and provides a hermetic rotary compressor capable of increasing the amount of eccentricity of the crankshaft portion and increasing the refrigerating capacity without reducing the productivity. It is intended to provide.

[0015]

According to the present invention, two compressor elements driven by a drive element having an electric motor are arranged in a closed container in an axial direction via a partition plate, and each of the compressor elements is provided. Rotating by the cylinder and the driving element
A shaft having an eccentric portion facing 180 °, 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 inserted and partitions 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, a discharge hole that discharges the compressed refrigerant, and a discharge hole that discharges the compressed refrigerant. A two-cylinder engine, comprising: a discharge valve device that opens and closes; and an end plate having a bearing portion of the shaft at each axial end of each of the compressor elements; A rolling piston type rotary compressor, wherein the two eccentric portions of the shaft are formed with different diameters, and the outer diameter of the upper end plate side and the outer diameter of the lower end plate side of the shaft are different diameters, The center arranged on the partition plate The is obtained by forming a size capable of inserting only the eccentric portions of the small diameter side.

[0016]

With this structure, the eccentricity of the eccentric portion of the shaft can be increased to increase the refrigerating capacity, and the partition plate can be assembled through the eccentric portion on the small diameter side, so that the productivity is reduced. It is not to be done.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

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 rotating shaft 2a, in which the cylinder chambers 18, 19 in which the inner diameters of the two cylinders 5, 6 are formed as D, is located on the rotating shaft 2a. And eccentric directions 180 ° opposite to the outer diameter of the lower end plate side, the same amount of eccentricity, and the different eccentricities of the crankshaft eccentric portions 7, 8 are provided via the rolling pistons 9, 10. I have.

In particular, the outer diameter d1 of the upper end plate is larger than the outer diameter d2 of the lower end plate.

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

Since the conventional eccentric portions of the crankshafts are opposed by 180 ° and have the same outer diameter, 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. Was not larger than (d0-d1) / 2, and there was a problem that the refrigerating capacity could not be increased.

On the other hand, each crankshaft eccentric part of the present invention has one
The eccentricity can be made larger than that of the conventional one by making the eccentric direction of 80 ° opposite, the same eccentricity, different outer diameter, and making the outer diameter of the upper end plate smaller than the outer diameter of the lower end plate. it can.

Therefore, as is apparent from the above description, according to the present invention, the crankshaft eccentric portions are 180 ° opposed to each other in the eccentric direction, the same eccentric amount, and the same eccentricity under the same cylinder chamber size. By setting the outer diameter, the amount of eccentricity can be increased, and the refrigerating capacity can be increased. 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.

[0025]

As described above, according to the present invention, two compressor elements driven by a drive element having an electric motor are provided in a closed container in the axial direction via a partition plate.
Each of the compressor elements is rotated by a cylinder and the driving element, and has a shaft having an eccentric portion facing 180 °, and is provided rotatably on the eccentric portion, and the inside of the cylinder is moved together with the eccentric portion of the shaft. An eccentrically rotating rolling piston, a vane slidably inserted into the cylinder and separating a compression chamber and a suction chamber, an elastic body for pressing the vane against the rolling piston, and a suction hole for introducing compressed refrigerant. A discharge hole for discharging the compressed refrigerant, a discharge valve device for opening and closing the discharge hole, and an end plate having bearing portions for the shaft at both axial ends of the compressor elements; A two-cylinder rolling-piston rotary compressor is provided by providing a fastening portion for connecting the plate and the compressor element, the two eccentric portions of the shaft are formed with different diameters, and the outer eccentric portion of the shaft is provided on the upper end plate side. Diameter and lower end The eccentricity of the eccentric portion of the shaft is reduced by making the outer diameter of the eccentric portion of the shaft different from that of the eccentric portion of the shaft by forming the central hole provided in the partition plate so that only the eccentric portion of the small diameter side can be inserted. It can be increased to increase the refrigeration 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 a main part of the same.

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 same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed 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

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F04C 23/00-29/10 331

Claims (1)

(57) [Claims] In a closed container, two compressor elements driven by a drive element having an electric motor are disposed axially through a partition plate, and each of the compressor elements is rotated by a cylinder and the drive element. A shaft having an eccentric portion facing 180 °, 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 freely inserted and separating the compression chamber and the suction chamber, an elastic body for pressing the vane against the rolling piston, a suction hole for introducing a compressed refrigerant, and a discharge hole for discharging the compressed refrigerant; Discharge valve devices that open and close the holes are provided, respectively,
At both ends in the axial direction of each of the compressor elements, an end plate having a bearing portion of the shaft, and a fastening portion connecting the end plates and the compressor element are provided to constitute a two-cylinder rolling piston type rotary compressor, Forming two eccentric portions of the shaft with different diameters,
In addition, the outer diameter of the upper end plate side and the outer diameter of the lower end plate side of the shaft are reduced in diameter.
So that the side adjacent to the eccentric part on the side is smaller than the other
And a central hole provided in the partition plate is formed in a size that allows only the eccentric portion on the small diameter side to be inserted therethrough.