JPH0799149B2 - Horizontal rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a horizontal rotary compressor designed to stabilize an oil surface by utilizing a pressure difference generated in a sealed case.

(Prior Art) As a horizontal rotary compressor of this type, a structure in which an electric motor and a compression device directly connected to the shaft of the electric motor are arranged in a hermetically sealed case is disclosed in, for example, Shokai Sho 61-8038.
It is known in Japanese Patent Publication No. 5 and Japanese Utility Model Laid-Open No. 59-86391, but in this case the refrigerant gas compressed by the compression device is discharged to the outside from the discharge pipe through the electric motor, but the refrigerant gas flowing in the case is The pressure decreases due to the pressure loss when passing through the electric motor and the like, and the pressure on the side of the machine chamber where the compressor is installed becomes higher than the pressure on the side of the discharge pipe where the electric motor is installed.

(Problems to be Solved by the Invention) In the horizontal rotary compressor of the type described above, the pressure on the side of the machine chamber where the compression device is provided in the case becomes higher than the pressure on the side of the discharge pipe where the electric motor is provided. The oil level is lower than the oil level on the discharge pipe side, and the amount of oil discharged from the discharge pipe increases.

In order to improve the above-mentioned difficulties, a technical means has been proposed in which the compression device and the electric motor are obliquely arranged in the case, but in this case, the overall height of the device becomes high, which is a limitation for making the device compact. .

The present invention has been made in view of the above-mentioned points, and the pressure difference generated in the closed case is used to stabilize the oil surface, improve the performance, and improve the oil separation effect to improve the oil separation from the discharge pipe. It is an object of the present invention to provide a horizontal rotary compressor that prevents outflow.

[Structure of Invention]

(Means for Solving the Problem) A horizontal rotary compressor of the present invention is a horizontal rotary compressor in which an electric motor and a compressor directly connected to the shaft of the electric motor are provided in a sealed case. Is provided with a through hole for communicating the compressor side with the electric motor side, and a disk is provided at the end of the electric motor rotor opposite to the compressor side so as to face the gas hole and the through hole.

(Operation) In the horizontal rotary compressor of the present invention, the refrigerant gas that has passed through the gas holes provided in the rotor of the electric motor collides with the disk provided in the electric motor rotor and is swung by the centrifugal force of the rotating disk, Flows radially outward from the center of the disc, which causes a pressure difference between the center of the disc and the outer periphery of the disc, but the through hole provided in the shaft connects the compressor side and the motor side. The pressure on the compressor side decreases and the oil level on the compressor side increases. Further, since the refrigerant gas contains a large amount of lubricating oil, the mass increases, the oil is separated by the centrifugal separation action of the disk added to the refrigerant gas, and the amount of oil discharged from the discharge pipe decreases.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 shows a horizontal type rotary compressor,
An electric motor 2 and a compression device 4 directly connected to a shaft 3 of the electric motor 2 are provided in a closed case 1 of the horizontal rotary compressor.

The electric motor 2 includes a stator 5 mounted on the closed case 1.
And a rotor 6 which is located in the stator 5 and into which the shaft 3 is fitted, and which divides the inside of the sealed case 1 into two.
The discharge pipe 7 that passes through the closed case 1 communicates with a chamber 8 located on the electric motor side of the two partitioned chambers. A disk (disk) 9 is integrally fixed to an end surface of the rotor 6 facing the electric motor side chamber 8, and a gas hole 10 is formed in the rotor 6 so as to penetrate therethrough. When a blade extending in the radial direction is attached to the surface of the disk 9 that faces the rotor 6, it is effective in shifting.

On the other hand, the compression device 4 includes a main bearing 11, a cylinder 12, and a sub bearing.
And a roller 14 disposed in the cylinder 12 includes an eccentric large-diameter portion provided in a portion of the shaft 3 corresponding to the cylinder 12.
It is exterior to 15. The compression device 4 divides a chamber on the compression device 4 side of the two chambers partitioned by the electric motor 2 into two chambers 16 and 17 which communicate with each other.

On the other hand, the shaft 3 is formed with a through hole 18 for communicating the chamber 16 on the compressor side with the chamber 8 on the electric motor side, and an accumulator 19 is attached to the case 1.

2 and 3 show an oil supply device incorporated in the horizontal rotary compressor of the present invention. This oil supply device is provided at a portion of the oil pipe 21 having the oil hole 20 and the through hole 18 corresponding to the compression device 4. The blade pump 22 and the shaft oil supply hole 23 are used to perform the oil supply operation by utilizing the reciprocating motion of the blade, and the diameter D1 of the through hole at the portion where the blade pump 22 is provided is larger than the diameter D2 of the other portion. It is set to a large diameter. Desirably, the vane pump 22 extends to a portion near the oil supply hole 23 of the shaft 3.

Then, the oil in the mixture of the refrigerant gas and the oil sucked into the through hole 18 of the shaft 3 adheres to the inner surface of the through hole 18 by the blade pump 22 and the centrifugal force and advances in the discharge direction. Since the diameter of the through hole 18 in which is located is larger than that of the other portions, oil is supplied from the oil supply hole 23 into the crank chamber through the oil introduction hole 24. The refrigerant gas in the mixture of the refrigerant gas and the oil proceeds to the discharge port as it is.

That is, since the oil supply from the oil supply hole 23 into the crank chamber is independent of the rotation of the roller, the oil supply is performed in addition to the conventional intermittent oil supply shown by the dotted line in FIG. 4 and the continuous oil supply shown by the solid line in FIG. Lubrication is performed, and the amount of lubrication to the sliding part becomes larger than that of the conventional one.

Next, the operation will be described.

The refrigerant gas compressed by the compression device 4 passes through the gas outlet 10 provided in the rotor 6 of the electric motor 2 from the discharge port of the valve cover provided in the bearing 11, collides with the disk 9 provided in the electric motor rotor 6, and rotates. It is swayed by the centrifugal force of the disk 9 and flows radially outward from the center of the disk 9,
This causes a pressure difference between the center of the disc and the outer periphery of the disc. Since the through hole 18 provided in the shaft 3 communicates the chamber 16 on the compressor side with the chamber 8 on the electric motor side, the pressure in the chamber 16 on the compressor side decreases due to this pressure difference, and the oil level on the compressor side is reduced. Get higher

On the other hand, the refrigerant gas contains a large amount of lubricating oil, and the mass of the refrigerant gas is increasing. The oil is separated from the refrigerant gas by the centrifugal action of the disk added to this refrigerant gas,
The refrigerant gas from which the oil has been separated is sent from the discharge pipe 7 to the refrigeration cycle.

〔The invention's effect〕

As described above, according to the present invention, the rotor of the electric motor is provided with the gas hole and the shaft is provided with the through hole that communicates the compressor side and the electric motor side, and the disk is provided at the end of the electric motor rotor opposite to the compressor side. Since it is equipped with, the oil level in the machine room is prevented from decreasing and performance and reliability are improved.
Further, the oil separating action of the disc can prevent the oil from flowing out from the discharge pipe.

[Brief description of drawings]

FIG. 1 is a sectional view of a horizontal rotary compressor of the present invention,
2 and 3 are diagrams showing an oil supply device incorporated in the horizontal rotary compressor, and FIG. 4 is a diagram showing an amount of oil supply of the oil supply device. 2 ... motor, 3 ... shaft, 4 ... compression section, 6 ...
Rotor, 9 ... Disk, 10 ... Gas hole, 18 ... Through hole.

Claims (1)

[Claims] 1. A horizontal rotary compressor having an electric motor and a compressor directly connected to a shaft of the electric motor in a sealed case, wherein a rotor of the electric motor has a gas hole, and the shaft has a through hole for connecting the compressor side and the electric motor side. And a disk is provided at an end of the electric motor rotor opposite to the compression device so as to face the gas hole and the through hole.