JPH06307364A - Two cylinder rotary compressor - Google Patents

Abstract

PURPOSE:To operate an inverter-driven compressor even in a low frequency range by forming on an eccentric part of the upper part of a crank a communicating hole to communicate a center hole to be arranged in a partitioning plate with the space to be defined by an upper eccentric part and an upper rolling piston. CONSTITUTION:When an electric-driven element 2 is energized and a driving shaft 2a is rotated, crankshaft eccentric parts 7, 8 are eccentrically rotated in cylinders 5, 6 respectively. Rolling pistons 9, 10 are rotated and moved while being brought into contact with vanes, and the suction and compression of the refrigerant gas is repeated in the cylinders 5, 6 with the periods which are deviated by half a rotation respectively. A communicating hole 20 to communicate a center hole 17 to be arranged in a partitioning plate 4 with the space to be defined by an eccentric part 7 of the upper crankshaft and the upper rolling piston 9 is formed in the eccentric part of the upper crankshaft. This constitution allows the lubrication by feeding the oil from the center of the crankshaft to the upper bearing even in a low frequency range.

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 a 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 according to the one disclosed in Japanese Patent Publication No. Sho 63-38691, is constructed as shown in FIG.

That is, reference numeral 1 in FIG. 3 denotes a closed container, and the electric element 2 is housed in the closed container 1.

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.

Both the crankshaft eccentric parts 7 and 8 are constructed integrally with the drive shaft 2a, and the crankshaft eccentric parts 7 and 8 are formed.
Rolling pistons 9 and 10 are rotatably mounted on each of the above. These rolling pistons 9 and 10 are
They 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 schillings 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 disposed in the central portion of the partition plate 4, and the hole diameter D ₀ of the central hole 17 is larger than the outer diameter d ₀ of the crankshaft eccentric portions 7 and 8 at the time of assembly. The central hole 17 is formed to be slightly larger, and is assembled by inserting both the crankshaft eccentric parts 7 and 8 from any direction during assembly.

In the multi-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 and 8 are moved to the cylinders 5 and 6.
In the inside, eccentric rotation occurs, and the rolling pistons 9 and 10 rotate while abutting against vanes (not shown), and the refrigerant gas is repeatedly sucked and compressed in both cylinders 5 and 6 in a cycle shifted by half a rotation. Both cylinders 5, 6
In the suction pipes 13, 14 respectively, the suction passages 11, 12
Refrigerant gas is drawn in through.

[0011]

However, in the hermetic rotary compressor described above, since the cylinders 5 and 6 partition plates 4 are provided, when lubricating the oil from the hollow portion of the crankshaft to each sliding portion, the head is high. , I can't drive at very low rpm. Therefore, in the case of a compressor driven by an inverter, there is a problem that it cannot be operated in a low frequency range.

The present invention has been made in view of the above circumstances. The eccentric portion of the upper portion of the crankshaft allows the central hole of the partition plate, the upper eccentric portion, and the space formed by the rolling piston to communicate with each other. It is an object of the present invention to provide a hermetic rotary compressor that can be operated at a low rotation speed by providing an oil supply hole.

[0013]

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 compressor element is Is rotated by the cylinder and the drive element,
And a rotary shaft having eccentric parts facing each other by 180 ° and having a hollow part formed in the shaft core part and arranged at a vertical position; A rolling piston that rotates eccentrically with the eccentric part,
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, at both axial ends of each compressor element, end plates having bearing portions for the shaft,
A two-cylinder type rolling piston type rotary compressor is constructed by providing a fastening portion for connecting the both end plates and the compressor element, and the eccentric portion at the upper portion of the shaft is provided with a central hole and the upper portion provided in the partition plate. An eccentric portion and a space formed by the upper rolling piston are provided in communication with each other to provide an oil supply hole.

[0014]

With this configuration, the structure is such that it can be operated even at a low rotational speed.

[0015]

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. 1, the upper crankshaft eccentric portion 7 communicates with the central hole 17 provided in the partition plate 4, the upper crankshaft eccentric portion 7 and the space formed by the upper rolling piston 9. The communication hole 20 is provided.

By thus providing the communication hole in the eccentric portion of the upper crankshaft, in the case of a compressor driven by an inverter, oil is fed from the hollow portion of the crankshaft to each sliding portion even in the low frequency range.
In particular, the upper bearing can be lubricated.

With this structure, it is possible to operate even in a low frequency range.

[0020]

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 through a partition plate.
A rotary shaft that is rotated by the cylinder and the drive element in each of the compressor elements and that has an eccentric portion facing each other by 180 °, has a hollow portion formed in the shaft core portion, and is arranged at a vertical position, Rolling piston that is rotatably provided in the cylinder and rotates eccentrically in the cylinder together with the eccentric portion of the shaft, a vane that is slidably inserted into the cylinder and separates the compression chamber from the suction chamber, and the rolling piston. An elastic body for pressing the vanes, a suction hole for introducing the compressed refrigerant, a discharge hole for discharging the compressed refrigerant, and a discharge valve device for opening and closing the discharge hole are respectively provided, and further, each of the compressor elements A two-cylinder 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 a compressor element at both ends in the axial direction,
In the eccentric part of the upper part of the shaft, an oil supply hole is provided by connecting the central hole arranged in the partition plate, the space formed by the upper eccentric part and the upper rolling piston. 2 cylinder rotary compressor.

With this configuration, it is possible to operate the compressor driven by the inverter in the low frequency range.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional view 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, 6 Cylinder 7, 8 Crankshaft eccentric part 9, 10 Rolling piston 11, 12 Suction passage 13, 14 Suction pipe 17 Central hole 18, 19 Cylinder chamber 20 communication holes

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. And a rotating shaft having eccentric parts facing each other by 180 ° and having a hollow part formed in the shaft core part and arranged at a vertical position, and the eccentric part being rotatably provided in the cylinder. A rolling piston that eccentrically rotates together with the eccentric part, a vane that is slidably inserted into the cylinder and that separates the compression chamber and the suction chamber, an elastic body that presses the vane against the rolling piston, and a compressed refrigerant. An intake hole for introducing, a discharge hole for discharging the compressed refrigerant, and a discharge valve device for opening and closing the discharge hole 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. Then, in the upper eccentric part of the shaft, an oil supply hole is provided by connecting the central hole arranged in the partition plate, the upper eccentric part and the space formed by the upper rolling piston. A two-cylinder rotary compressor characterized by the above.