JPH0579485A - Gas compressor - Google Patents

Abstract

PURPOSE:To ensure the level of lubricating oil in partition chambers on right and left sides at a specified level so as to improve the working efficiency of a drive device. CONSTITUTION:A gas compressor comprises partition chambers 7, 8, and 9 mutually intercommunicated through a communicating hole 11 formed in a case body 1 and being three independent chambers of central and right/left side chambers which are filled with lubricating oil up to a specified level, a pair of compression devices 13 to compress refrigerant gas inputted through a suction port 27 formed in the central partition chamber 8 and deliver it to the partition chambers 7 and 9 on right and left sides, and a delivery port 15 which is communicated to the partition chambers 7 and 9 on right and left sides through gas passages 40 and 40 and through which compressed gas fed in the central partition chamber 8 is delivered to the outside. Further, the compressor is provided with a drive device 43 to exert a drive force on the compression devices 13 located in the partition chambers 7 and 9 on right and left sides and a means for balancing the interior of the partition chambers on right and left sides to intercommunicate the partition chambers 7 and 9 on right and left sides through a communicating passage 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal type gas compressor provided in a hermetically sealed case with two horizontal compression devices and two drive devices for driving the respective compression devices.

[0002]

2. Description of the Related Art Conventionally, a two-in-one type gas compressor provided with two compression devices and two drive devices for driving the compression devices has three parts, a center part and left and right parts, in a horizontally long sealed case. Two independent compartments are provided, and a pair of compression devices are provided in the central compartment. A drive device for driving each of the compression devices is provided in each of the left and right partition chambers, and the refrigerant gas compressed by the compression device is once discharged into the left and right partition chambers and then centrally passed through the gas passages. And is discharged to the outside through the discharge port provided in the central partition chamber.

Lubricating oil that has been sucked up is supplied to each sliding portion of the compression device and the drive device, so that smooth operation is ensured.

[0004]

As described above, the sliding parts of the compression device and the drive device are ensured to operate smoothly by the lubricating oil. The lubricating oil is stored in each of the three partition chambers. The oil level is maintained at a specified level by the communication holes that connect the compartments.

In this case, since the 2-in-1 type is a horizontal type, the compression device and the drive device are laid out in a laid posture, so that the lower half faces the lubricating oil. Become. At this time, the oil level of the lubricating oil is filled to a level position where the rotor of the drive unit agitates the lubricating oil and does not cause operating resistance.

However, when the rotational speeds of the left and right drive devices are changed depending on the operating conditions, the discharge amount from each compression device changes, so that the pressure loss in the gas passage connecting the central and left and right partition chambers also changes. As a result, the oil level of the lubricating oil in the partition chamber with a small discharge amount is pushed upward due to the influence of the gas pressure in the partition chamber with a large discharge amount. For this reason,
The lubricating oil pushed up beyond the specified level is agitated by the rotor of the drive unit, resulting in a large actuation resistance, leading to a power loss. Further, in the partition chamber where the oil level is lowered, the position may be below the suction position of the lubricating oil in some cases, and there is a risk of poor oil supply.

Therefore, in the present invention, even if the rotational speeds of the left and right drive devices are changed depending on the operating conditions, the oil of the lubricating oil in the left and right partition chambers is not affected by the rotational speeds of the respective drive devices. It is an object of the present invention to provide a gas compressor whose surface is always within a specified level and which does not generate operating resistance.

[0008]

In order to achieve the above-mentioned object, according to the present invention, the central portion and the left and right portions, which are communicated with each other through a communication hole provided in the case main body and which are filled with lubricating oil to a prescribed level, are provided. Three independent partition chambers, a pair of compression devices provided in the central partition chamber for compressing the refrigerant gas taken in from the suction port and discharging it into the left and right partition chambers, and the left and right partition chambers and the gas passages. The discharge port for discharging the compressed gas sent into the central partition chamber to the outside, the drive device provided in each of the left and right partition chambers for applying a driving force to each of the compression devices, and the left and right partition chambers. The left and right partition chambers are provided with gas pressure equalizing means that communicate with each other through a passage.

[0009]

According to such a gas compressor, the lubricating oil sucked up by the operating pressure of the compressor is supplied to each sliding portion of the compressor and the drive unit through the lubricating oil supply passage, so that a smooth operating state is obtained. Will be obtained.

On the other hand, even if the discharge amount in the left and right partition chambers changes due to operating conditions, no differential pressure is generated by the communication passage, and the oil level of one lubricating oil is not pushed up due to the influence of the differential pressure. Thus, the oil level of the lubricating oil that does not hinder the operation of the drive device is secured.

[0011]

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

In the figure, reference numeral 1 denotes a case body of the gas compressor 3, and the case body 1 has a horizontally long sealed shape. Inside the case main body 1, three independent partition chambers 7, 8 and 9 are provided horizontally at the center and left and right by partition walls 5 and 5. Lubricating oil is contained in each of the three partition chambers 7, 8 and 9, and the oil level P of this lubricating oil is secured at a prescribed level by the communication holes 11 and 11 provided in the partition wall 5 and 5. ..

A pair of left and right compression devices 13, 13 and a discharge port 15 are provided in the central partition chamber 8.

The compression device 13 is provided with a roller 21 which is supported by a main bearing 17 and a sub-bearing 19 so as to make a swiveling motion. The roller 21 is projected and retracted on the outer peripheral surface in correspondence with the eccentric motion of the roller 21. The blade 23 is in contact. As a result, the compression chamber 25 is formed, and the compression chamber 25 expands and contracts due to the swirling motion of the roller 21, compresses the refrigerant gas taken in through the suction ports 27, 27, and the left and right partition chambers 7 through the discharge ports 29, 29.・ It is designed to discharge into 9. The blade 23 is assembled in the casing 31 and is constantly urged toward the roller 21 by the urging spring 33. An oil supply pipe 39 having a suction port 37 below the oil surface P of the lubricating oil is provided in an assembly hole 35 in the casing 31 in which the blade 23 is assembled.
Is connected to one end, and the other end of the oil supply pipe 39 is connected to the sub bearing 19. As a result, the blade 23 and the assembly hole 35, which expand and contract against the biasing spring 33, have a cylinder-piston relationship, and the operating pressure allows suction of the lubricating oil from the suction port 37.

On the other hand, the left and right partition chambers 7 and 9 communicate with the central partition chamber 8 through the gas passages 40 provided in the partition walls 5 and further serve as gas pressure balancing means. The left and right partition chambers 7 and 9 communicate with each other via a passage 41.

Further, inside the left and right partitioning chambers 7 and 9, there are provided driving devices 43 and 43 for applying rotational power to the compression device 13.

The drive device 43 comprises a stator 45 fixed to the case body 1 side and a rotor 47 which rotates when an electric current flows through the stator 45. The rotor 47 is rotatably supported by the main bearing 17. In addition, it is mounted and supported by a shaft 51 having an eccentric cam 49 that gives the roller 21 a turning motion. Drive unit 4
3 and the sliding parts of the compression device 13 are the same as the oil supply pipe 39.
Lubricating oil is forcibly fed by an oil supply passage 53 which is connected to and communicates with.

In the gas compressor 3 thus constructed, the compressor 13 compresses the refrigerant gas taken in through the suction port 27 by the rotational power given from the drive device 43, and the left and right partition chambers 7 are discharged from the discharge port 29.・ Discharge into 9. The compressed gas discharged into the left and right partition chambers 7 and 9 is guided to the central partition chamber 8 from the gas passages 40 and 40,
The cycle of discharging from the discharge port 15 to the outside is repeated.

At this time, the lubricating oil sucked up from the suction port 37 by the operating pressure of the blade 23 is supplied to the oil supply pipe 39.
Is supplied to each sliding portion of the drive device 43 and the compression device 13 via the, so that a smooth operation state can be obtained.

On the other hand, when the number of rotations of each drive device 43 changes depending on the operating conditions, the discharge amount discharged to the left and right partition chambers also changes. At the same time, gas passage 40.4
One of the pressure losses of 0 is large and the other is small, but at this time, the communication passage 41 balances the gas pressures in the partition chambers 7 and 9 so that no differential pressure is generated. Therefore, the oil surface P of one of the lubricating oils is not pushed up, and the oil surface P of the lubricating oils in the left and right partition chambers 7.9 is maintained at the regulated level, so that the rotor 47 stirs the lubricating oil. No operating resistance occurs and an efficient operating state is obtained.

[0021]

As described above, according to the gas compressor of the present invention, the lubricating oil sucked up by the lubricating oil supply passage can be supplied to each sliding portion of the compression device and the drive device. Thus, smooth operation can be reliably ensured for a long period of time.

Further, even if the rotational speed of each drive device changes,
Since the oil level can be maintained at a level that does not hinder the operation of the drive device without being affected by the rotational speed, an efficient operating state can be obtained regardless of operating conditions.

[Brief description of drawings]

FIG. 1 is a sectional side view of a gas compressor embodying the present invention.

FIG. 2 is a sectional view in which an oil supply pipe is connected to an assembling hole of a blade.

[Explanation of symbols]

 1 Case Body 7/8/9 Partition Chamber 11 Communication Hole 13 Compressor 15 Discharge Port 27 Suction Port 40 Gas Passage 41 Communication Passage 43 Drive Device

Claims (1)

[Claims] 1. A central body and three left and right independent compartments that are provided in the case body and communicate with each other through a communication hole and contain lubricating oil to a specified level, and take in from a suction port provided in the center compartment. A pair of compressors that compress the compressed refrigerant gas and discharge it into the left and right partition chambers, and communicate with the left and right partition chambers via a gas passage, and discharge the compressed gas sent into the central partition chamber to the outside. A discharge port, a drive device that is provided in each of the left and right partition chambers and applies a driving force to the compression device, and a gas pressure balancing means for the left and right partition chambers that communicate the left and right partition chambers via a communication passage. And a gas compressor.