JPH08247062A - Rotary compressor - Google Patents

Abstract

PURPOSE: To restrain penetration quantity of a refrigerant into lubricating oil small by making the inside of a closed case in a low pressure type by way of providing an oiling means on the suction side of a cylinder of a compression mechanism part storing a roller eccentrically rotating in the cylinder. CONSTITUTION: A refrigerant is delivered to the inside of a closed case from a first suction passage 3, sucked in a compression chamber 39 through a second suction passage 15 and a suction port 41, and discharged gas after compression is discharged outside through a discharge port 43, a discharge chamber 45 and a discharge passage 51 at the time of driving a rotary compressor. At this time, gas is separated by centrifugal force generated by rotation of a gas exhaust hole 59 and a gas exhaust hole 20 on the side of a disc 14 as the gas exhaust holes 59 and 20 are rotated with a rotor 9, and consequently, pressure in a vent hole 16 is lowered and suction force is increased, feeding quantity of lubricating oil OL by a vane pump 57 is increased, and certain oil feeding is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor suitable for refrigerators, air conditioners and the like.

[0002]

2. Description of the Related Art At present, Freon refrigerants are used as refrigerants for refrigerators and air conditioners because of their stable physical properties and easy handling.

[0003]

Fluorocarbon refrigerants have stable physical properties and are easy to handle, while chlorine-containing refrigerants are said to destroy the ozone layer, which adversely affects the global environment.
A preparation period will be provided and the use will be totally prohibited in the future.

Therefore, HFC refrigerants and HC refrigerants such as propane and butane are candidates as alternative refrigerants. In order to protect the global environment, these refrigerants have been a global problem such as prevention of global warming and reduction of the amount of use from the viewpoint of effectively utilizing limited resources.

In view of this, the present invention reduces the amount of refrigerant to be filled, achieves resource saving, eliminates lubrication breakage in each sliding portion of the compression mechanism, and ensures stable operation and efficient compression. It aims at providing the rotary compressor which was made into.

[0006]

In order to achieve the above object, the present invention compresses a refrigerant guided by a suction passage in a hermetically sealed case in which lubricating oil is sealed by a compression mechanism section,
In the rotary compressor that discharges to the outside of the closed case through the discharge passage, the compression mechanism section includes a cylinder,
An eccentric rotation is given by an eccentric shaft portion arranged in the crank chamber, and the roller is configured to rotate eccentrically in the cylinder and a blade that contacts the outer peripheral surface of the roller and forms a compression chamber. A means for refueling is provided.

As the oil supply means, there are a case where a communication path connects the crank chamber to the suction side of the cylinder, and a case where the suction side of the cylinder communicates with the oil sump portion of the closed case.

Further, the crank chamber is provided with gas discharging means for discharging the gas that has entered the crank chamber to the low-pressure space.

The gas discharging means may be a method of connecting the crank chamber and the inner space of the closed case by a communication passage, or a method of connecting the crank chamber and the suction side of the cylinder.

As means for increasing the lubricating oil supply capacity, a drive mechanism section composed of a rotor and a stator and a compression mechanism section to which rotational power is applied from the drive mechanism section are provided in a sealed case in which the lubricant oil is sealed. In the rotary compressor, which has a compressor that compresses the refrigerant guided from the suction passage into the closed case by the compression mechanism section and discharges the refrigerant to the outside through the discharge pipe, communicates with the crank chamber of the compression mechanism section. ,
In the gas vent hole that passes through the center of the compression mechanism and the drive mechanism,
A gas exhaust hole is provided orthogonal to the gas vent hole.

Alternatively, a disk is provided at the end of the rotor on the side opposite to the compression mechanism, and a gas discharge hole communicating with the gas vent hole and orthogonal to the rotation axis of the disk is provided in the disk.

Alternatively, the gas discharge hole is provided in the rotor.

[0013]

According to such a rotary compressor, since the refrigerant is a low pressure type in which the refrigerant is guided into the closed case by the suction passage, the amount of the refrigerant that melts into the lubricating oil can be suppressed to be small. For this reason, it is not necessary to add an extra amount of refrigerant in anticipation of the amount of dissolution into the lubricating oil, and the amount of refrigerant enclosed can be reduced accordingly.

On the other hand, during operation, the lubricating oil is supplied to each sliding portion of the compression mechanism portion by the oil supply means. At this time, since the disk also rotates together with the rotor, the gas is swung out from the gas discharge hole by the centrifugal force due to the rotation of the disk, so that the pressure in the gas vent hole decreases.
As a result, the suction force of the lubricating oil is increased, and the lubricating oil can be reliably supplied.

Further, during compression, the refrigerant gas leaked into the crank chamber returns to the suction side of the cylinder, which is a low pressure space, by the gas discharge means, so that the lubricity of the bearing is not deteriorated.

[0016]

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

In FIG. 1, reference numeral 1 denotes a hermetic case of a compressor. The hermetic case 1 is a low pressure type in which a refrigerant is guided by a first suction passage 3 provided in an upper part of the hermetic case 1. The first suction passage 3 is formed by a suction pipe, and one end 3a faces the sealed case 1,
The other is extended to the outside. A compression mechanism portion 5 is accommodated in the lower portion of the closed case 1, and a drive mechanism portion 7 for imparting rotational power to the compression mechanism portion 5 is accommodated and arranged in the upper portion thereof. The lubricating oil OL of is enclosed.

The drive mechanism section 7 includes a rotor 9 and a stator 11.
The stator 11 is fixedly supported on the inner wall surface of the closed case 1. The rotor 9 is fixedly supported by the shaft 13, and a rotating power is given to the rotor 9 by the electric current flowing through the stator 11.

The rotor 9 is provided with a rotatable disk 14 at an upper end opposite to the compression mechanism section 5, and a central portion of the disk 14 has an inlet 15a side of a second suction passage 15 which will be described later. It is arranged. As a result, the rotation of the disk 14 diffuses the refrigerant liquid, the lubricating oil and the like due to the liquid back in all directions, so that the lubricating oil and the like are not sucked into the second suction passage 15.
The inlet 15a side of the second suction passage 15 and the end portion 3a of the first suction passage 3 described above are arranged close to each other.

The disk 14 has a gas vent hole 1 described later.
A gas discharge hole 20 communicating with 6 is provided in a direction orthogonal to the rotation axis of the disk 14.

The compression mechanism section 5 includes a cylinder 17 and a roller 1.
The cylinder 17 is fixedly supported on the inner wall surface of the closed case 1. The roller 19 has the shaft 13
And the shaft 13 is rotatably supported at both ends by a main bearing 21 and a sub bearing 23.

The roller 19 is mounted on an eccentric shaft portion 25 provided on the shaft 13, and is eccentrically rotated by the rotation of the eccentric shaft portion 25.

Crank chamber 27 provided with eccentric shaft portion 25
2 and the suction side 29 which is the low pressure side of the cylinder 17 are shown in FIG.
As shown in FIG. 3, the communication passage 31 communicates with the lubricating oil, which is supplied into the crank chamber 27 through the communication passage 31 and is sent to the suction side 29 of the cylinder 17.
When the refrigerant gas under compression leaks and enters the crank chamber 27, the communication passage 31 deteriorates the lubricity of the bearing and causes seizure. Therefore, the leaked refrigerant gas is returned to the suction side 29 of the cylinder 17. Also serves as a return passage.

In this case, as shown in FIG.
A gas discharge hole 33 that communicates with the crank chamber 27 and discharges into the closed case 1 may be provided. According to this embodiment, the refrigerant gas leaking into the crank chamber 27 during the compression can be smoothly discharged.

A compression chamber 39 is formed in the cylinder 17 by a blade 37 which is constantly in contact with the outer peripheral surface of the roller 19 by a biasing means 35 such as a spring.

The compression chamber 39 extends in a direction orthogonal to the axis X of the shaft 13 and has a suction port 41 provided in the cylinder 17 and a discharge port 43 having an opening / closing valve 42 provided in the main bearing 21 and the auxiliary bearing 23. , 43 to communicate with the upper and lower discharge chambers 45, 45 formed in a ring shape,
The upper and lower discharge chambers 45, 45 communicate with each other via a communication passage 47.

The discharge chamber 45 is formed inside a discharge cover 49 provided on the main bearing 21 and the auxiliary bearing 23 via a seal member 48. The upper and lower discharge chambers 45 are the shaft 1
In the direction orthogonal to the axis X of 3, the cylinder 17 is connected to and communicates with a discharge passage 51 extending from the cylinder 17 to the outside of the closed case 1 and formed by a discharge pipe through a communication passage 47.

The second suction passage 15 is formed by a suction pipe and has one end located in the central portion of the disk 13 and the other end passing outside the sealed case 1 and connected to the suction port 41 of the cylinder 17. It is in communication.

A heat exchanger 53 is provided in the middle of the second suction passage 15, and when the refrigerant passes through the heat exchanger 53, the heat is exchanged and cooled. In this case, the heat exchanger 53 is not always necessary.

The refrigerant is HC such as propane or isobutane.
While the system refrigerant is used, the refrigerant is HF in the lubricating oil OL.
In the case of C type, mineral oil is used, and in the case of HC type refrigerant, lubricating oil such as fluorine type or PAG type (polyalkylene glycol) is used.

The lubricating oil OL is supplied to the blade pump 5 provided along the oil supply passage 55 provided on the lower end side of the shaft 13.
7, and is supplied to each sliding portion of the compression mechanism portion 5, for example, in the crank chamber 27, the main bearing 21, the sub bearing 23, and the like.

On the suction side 29 of the cylinder 17,
As shown in FIGS. 2 and 3, the lubricating oil is supplied by the communication passage 31 communicating with the crank chamber 27. However, as shown in FIG. 4, the suction side 29 of the cylinder 17 and the oil sump 8 are connected to each other. It is also possible to use a means for communicating directly with the communication passage 55.

On the other hand, the oil supply passage 55 provided on the shaft 13 communicates with the gas vent hole 16 extending upward along the shaft 13. The gas vent hole 16 is for letting in the lubricating oil or releasing the foamed gas of the refrigerant gas in the lubricating oil.
First gas discharge hole 57 and second gas discharge hole 5 orthogonal to
9 are provided. The first gas discharge hole 57 has a shape that directly faces the sealed case 1. The second gas discharge hole 59 has a shape that passes through the rotor 9 and faces the closed case 1.

According to the rotary compressor constructed as described above, the refrigerant sent into the closed case 1 by the first suction passage 3 flows in the second suction passage 15,
It is compressed in the compression chamber 39 through the suction port 41 and is discharged from the discharge passage 51 to the outside.

During this operation, the inside of the closed case 1 is
Since the refrigerant is guided by the first suction passage 3 and is of a low pressure type, the amount of the refrigerant melted in the lubricating oil OL can be suppressed to a small amount. It becomes possible to reduce the amount of the enclosed refrigerant by that amount.

By the way, in the case of a 450 liter class refrigeration system, when the total amount of the enclosed refrigerant is 100%, the high pressure type in which the discharge gas is discharged into the closed case 1 is compatible, About 20% of the refrigerant melts.

Therefore, it is necessary to increase the enclosed amount by 20%, but in the case of this embodiment, it is not necessary to consider the melted amount, so that it is possible to reduce the enclosed amount of 20% refrigerant by simple calculation. Become.

The lubricating oil OL is supplied to each sliding portion of the compression mechanism section 5 via the oil supply passage 55. In this case, the first and second gas discharge holes 57 and 59 and the disc 1
The gas discharge hole 20 on the fourth side rotates together with the rotor 9, and the centrifugal force generated by the rotation causes the gas to be swung out. As a result, the pressure in the gas vent hole 16 decreases. Therefore, the suction force is increased, the amount of lubricating oil OL supplied by the blade pump 57 is increased, and the lubricating oil can be reliably supplied. At the same time, the pressure on the suction side 29 of the cylinder 17 becomes lower than the pressure of the refrigerant gas in the closed case 1,
The in-case pressure Ps exhibits the cycle characteristics shown in FIG. 7, and a differential pressure V is generated for each cycle, and the differential pressure causes the lubricating oil OL to be intermittently supplied through the communication passage 31. become.

Therefore, the sealability of the compression chamber by the lubricating oil is improved, and efficient compression can be obtained.

On the other hand, when the compressed refrigerant gas leaks and enters the crank chamber 27, the leaked refrigerant gas returns to the suction side 29 of the cylinder 17 through the communication passage 31, and the influence of the refrigerant gas. As a result, the lubricity of the bearing is not deteriorated, and a stable operating condition can be obtained for a long period of time.

[0041]

As described above, according to the rotary compressor of the present invention, the following effects can be obtained.

(1) Since the pressure inside the closed case can be reduced by the suction passage, the amount of melted into the lubricating oil can be suppressed to a small amount and the amount of the refrigerant enclosed can be reduced.

(2) The centrifugal force generated by the rotation of the gas discharge hole increases the suction force of the lubricating oil, so that the lubricating oil can be reliably supplied to each sliding portion of the compression mechanism portion.

(3) Since the lubricating oil can be supplied to the suction side of the cylinder having a low pressure by the communication passage, the sealing property of the compression chamber by the lubricating oil is improved, and an efficient compressed state can be obtained.

(4) Even if refrigerant gas leaks into the crank chamber during compression, it can be discharged to the low-pressure space.
The lubrication of the bearing is not deteriorated by the influence of the refrigerant gas, and a stable operating state can be obtained for a long period of time.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary compressor according to the present invention.

FIG. 2 is a cross-sectional view of a main part where a crank chamber and a suction side of a cylinder are communicated with a communication passage.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a cross-sectional view of a main part in which a suction side of a cylinder and an oil sump are communicated with each other through a communication passage.

FIG. 5 is an explanatory diagram in which a gas discharge hole is provided in the disc.

FIG. 6 is an explanatory view in which a gas discharge hole for letting out a refrigerant gas that has entered the crank chamber is provided in the main bearing.

FIG. 7 is a characteristic diagram of case internal pressure.

[Explanation of symbols]

 1 Sealed Case 5 Compression Mechanism 17 Cylinder 19 Roller 25 Eccentric Shaft 27 Crank Chamber 29 Cylinder Suction Side 31 Communication Passage (Filling Means) 39 Compression Chamber 51 Discharge Passage OL Lubricating Oil

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Fukuda 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Pref., Institute of Housing and Space Systems Technology, Toshiba Corporation (72) Koji Kashima, Shinsugita-cho, Isogo-ku, Yokohama, Kanagawa Address Company Toshiba Living Space Systems Research Institute (72) Inventor Tetsuo Sano 8 Shinsita-cho, Isogo-ku, Yokohama, Kanagawa Prefecture Incorporated Toshiba Living Space Systems Research Institute (72) Incorporator Masao Ozu Isoko Yokohama, Kanagawa Shin-Sugita-cho, Tokyo-ku, Ltd. Inside the Toshiba Living Space Systems Technology Laboratory Co., Ltd. (72) Inventor Teruo Kozuna, 3-3-9, Shimbashi, Minato-ku, Tokyo

Claims (9)

[Claims] 1. A rotary compressor in which a refrigerant guided by an intake passage into a sealed case in which lubricating oil is sealed is compressed by a compression mechanism portion and discharged to the outside of the sealed case through a discharge passage. And a roller which is eccentrically rotated by the eccentric shaft portion arranged in the crank chamber and is eccentrically rotated in the cylinder, and a blade which contacts the outer peripheral surface of the roller and forms a compression chamber. A rotary compressor characterized in that oil supply means for supplying oil is provided on the suction side of the cylinder. 2. The rotary compressor according to claim 1, wherein the oil supply means is a communication passage that connects the crank chamber and the suction side of the cylinder. 3. The rotary compressor according to claim 1, wherein the oil supply means is a communication passage that connects the suction side of the cylinder and the oil reservoir of the closed case. 4. The rotary compressor according to claim 1, wherein the crank chamber is provided with gas discharging means for discharging the gas that has entered the crank chamber to the low-pressure space. 5. The rotary compressor according to claim 1, wherein the gas discharge means is a communication passage that connects the crank chamber and the space inside the closed case. 6. The rotary compressor according to claim 1, wherein the gas discharge means is a communication passage that connects the crank chamber and the suction side of the cylinder. 7. A hermetically sealed case, in which lubricating oil is sealed, has a drive mechanism section composed of a rotor and a stator, and a compression mechanism section to which rotational power is applied from the drive mechanism section. In a rotary compressor in which the refrigerant guided to the compressor is compressed by the compression mechanism section and discharged to the outside through a discharge pipe, the rotary compressor communicates with the crank chamber of the compression mechanism section, and the center of the compression mechanism section and the drive mechanism section. A rotary compressor, characterized in that a gas exhaust hole passing through is provided with a gas exhaust hole orthogonal to the gas vent hole. 8. An end portion of the rotor opposite to the compression mechanism portion,
8. The rotary compressor according to claim 7, wherein a disk is provided, and a gas discharge hole which is in communication with the gas vent hole and is orthogonal to the rotation axis of the disk is provided in the disk. 9. The rotary compressor according to claim 1, wherein the gas discharge hole is provided in the rotor.