JPH0510279A - Two-cylinder rotary compressor - Google Patents

Abstract

PURPOSE:To improve the refrigerating property by forming diameters of eccentric core parts of a crankshaft, which are opposite to each other at 180 deg., so as to be different from each other, and forming an outer diameter of the upper end plate side and an outer diameter of the lower end plate side of the crankshaft so as to be different from each other, and forming a central hole of a partitioning plate into a largeness, to which only the eccentric core part of the small diameter side can be inserted. CONSTITUTION:Diameters d01, d02 of eccentric core parts of a crankshaft 2a, which are opposite to each other at 180 deg., are formed different from each other. An outer diameter d1 of the upper end plate side and an outer diameter d2 of the lower end plate side in the crankshaft 2a are formed different from each other, and a central hole of a partitioning plate 4 is formed into a largeness, to which only the small diameter side eccentric core part can be inserted, to enlarge the eccentricity.

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 already been proposed in accordance with the one disclosed in Japanese Examined Patent Publication No. 63-38691, is constructed as shown in FIGS.

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 portions 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 suction passages 11 and 12, respectively. Suction pipes 13 and 14 are connected to the suction passages 11 and 12, respectively.

The suction pipes 13, 14 are provided with suction passages 11,
12 communicates with suction chambers 18 and 19. Further, a central hole 17 is arranged in the central portion of the partition plate 4, and the diameter D0 of the central hole 17 is slightly smaller than the outer diameter d0 of the crankshaft eccentric portions 7 and 8 when independent. The central hole 17 is formed in a large size so that the crankshaft eccentric portions 7 and 8 can be inserted 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 is rotated, the crankshaft eccentric parts 7, 8 cause the cylinders 5, 6 to move.
The cylinders eccentrically rotate inside, and the rolling pistons 9 and 10 rotate while abutting on vanes (not shown), and suction and compression of the refrigerant gas are repeated in both cylinders 5 and 6 in a cycle shifted by half a rotation. Both cylinders 5, 6
The suction pipes 13 and 14 of the suction passages 11 and 12 respectively.
Refrigerant gas is drawn in through.

[0012]

However, in the hermetic rotary compressor described above, 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.

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 problems can be solved, but on the contrary, the partition plate 4 must be divided. There has been a problem that it becomes impossible to assemble and the productivity is greatly 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 portion without lowering the manufacturability. It is intended to be provided.

[0015]

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 via a partition plate, and each of the compressor elements is provided. By the cylinder and the drive element,
And a shaft having an eccentric portion opposed to each other by 180 °, a rolling piston rotatably provided on the eccentric portion and rotating eccentrically in the cylinder together with the eccentric portion of the shaft, and slidably on the cylinder. A vane that is inserted to separate the compression chamber and the suction chamber, an elastic body that presses the vane against the rolling piston, a suction hole that introduces a refrigerant to be compressed, a discharge hole that discharges the compressed refrigerant, and a discharge hole Discharge valve devices for opening and closing are provided respectively, and further, end plates having bearing portions for the shafts and fastening portions for connecting the end plates and the compressor element are provided at both axial ends of each compressor element. Form a rolling piston type rotary compressor, 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, Center placed 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 refrigerating capacity can be increased by increasing the eccentric amount of the eccentric part of the shaft, and the partition plate can be assembled through the eccentric part on the small diameter side, so the manufacturability is reduced. It is something that is not done.

[0017]

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 by 180 ° eccentric direction opposite to the outer diameter of the lower end plate side, the same eccentric amount, and different outer diameters are provided through the rolling pistons 9 and 10, respectively. There is.

In particular, 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 crankshaft eccentric parts are opposed to each other 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. Cannot be made larger than (d0-d1) / 2, so the refrigerating capacity cannot be made large.

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

Therefore, as is apparent from the above, according to the present invention, the crankshaft eccentric portions are 180 ° opposite to each other in the eccentric direction, the same eccentric amount, and different, under the same size of the cylinder chamber. 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 refrigerating 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 axially arranged in a closed container via a partition plate.
A shaft that is rotated by the cylinder and the drive element in each of the compressor elements and that has an eccentric portion that opposes by 180 °, and a shaft that is rotatably provided in the eccentric portion and that has the eccentric portion of the shaft in the cylinder. An eccentrically rotating rolling piston, a vane slidably inserted into the cylinder and separating the compression chamber and the suction chamber, an elastic body for pressing the vane against the rolling piston, and a suction hole for introducing a refrigerant to be compressed. A discharge hole for discharging the compressed refrigerant and a discharge valve device for opening and closing the discharge hole, and further, an end plate having bearing portions for the shaft at both axial ends of each compressor element, and both ends thereof. A two-cylinder rolling piston rotary compressor is provided by providing a fastening portion connecting the plate and the compressor element, two eccentric portions of the shaft are formed with different diameters, and the outer end of the shaft on the upper end plate side is formed. Diameter and bottom The eccentricity of the eccentric portion of the shaft is reduced by forming the central holes arranged in the partition plate to have a size that allows only the eccentric portion on the small diameter side to be inserted, while making the outer diameters of the sides different diameters. It can be increased to increase the refrigerating capacity.

[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 cross-sectional view of the relevant part.

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

FIG. 4 is an enlarged sectional view of the main part.

[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)

Claim: What is claimed is: 1. A compressor comprising a compressor and a compressor, the compressor being driven by a driving element having an electric motor, arranged axially in the sealed container through a partition plate. And a shaft having an eccentric portion that is rotated by the drive element and is opposed to 180 °, and a rolling piston that is rotatably provided on the eccentric portion and that eccentrically rotates in the cylinder together with the eccentric portion of the shaft. , A vane that is slidably inserted into the cylinder 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 refrigerant to be compressed, and discharges the compressed refrigerant. A discharge hole and a discharge valve device for opening and closing the discharge hole are respectively provided, and further,
A two-cylinder rolling piston rotary compressor is configured by providing end plates having bearing portions of the shaft and fastening portions connecting the both end plates and the compressor element at both axial ends of each compressor element. Forming two eccentric parts of the shaft with different diameters,
Moreover, the outer diameter of the upper end plate side of the shaft is different from the outer diameter of the lower end plate side, and the central hole provided in the partition plate is formed in a size that allows only the small-diameter side eccentric portion to be inserted. A two-cylinder rotary compressor characterized in that