JPH07305688A - Scroll compressor - Google Patents

Abstract

PURPOSE:To provide an oil supplying mechanism capable of supplying sufficient lubricating oil also when a scroll compressor is rotated at low speed. CONSTITUTION:A communication passage 15 for communicating a discharge chamber with a motor chamber 16 is formed on the outer peripheral parts of a frame 9 of a scroll compressor and a fixed scroll 4 fixed on the frame 9 along the inside of a sealed container 1, and an oil reservoir 22 taking the upper side of the frame 9 as an opening part is provided in the communication passage 15. A through hole 23 inclined toward a bearing part for supporting a crankshaft 7 of the frame 9 is formed from the lower side in this oil reservoir 22, and lubricating oil trapped by the oil reservoir 22 is supplied to the bearing part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly to the supply of lubricating oil to bearings.

[0002]

2. Description of the Related Art A conventional scroll compressor will be described with reference to FIG. As shown in FIG. 2, the scroll compressor includes a compression unit 2 and an electric motor 3 in a sealed container 1. The compression unit 2 includes a fixed scroll 4, an orbiting scroll 5, an Oldham ring 6, a crankshaft 7, an eccentric bearing 8,
It is mainly composed of a frame 9 and a shaft 10.
In this structure, the fixed scroll 4 fixed to the frame 9 and the orbiting scroll 5 are engaged with each other to form a plurality of compression chambers 1.
Forming 2. When the electric motor 3 rotates, the shaft 1
Eccentric bearing 8 fitted to the crankshaft 7 formed in the upper part of 0
To the orbiting scroll 5 by the orbiting drive shaft 5c,
The Oldham ring 6 prevents rotation and makes a turning motion.
The low-pressure refrigerant sucked from the suction pipe 13 into the compression section 2 by the orbiting motion of the orbiting scroll 5 is compressed while becoming a high-pressure refrigerant while sequentially moving from the outer peripheral portion of the compression chamber 12 to the central portion. This high-pressure refrigerant is supplied into the compression chamber 12 and is discharged from the discharge port 14 together with the lubricating oil that becomes mist while lubricating each sliding portion, passes through the communication passage 15 and exits from the space between the frame 9 and the electric motor 3. Is guided to the motor chamber 16 and the mist-like lubricating oil is attached in the middle of the path to reduce the oil content and the discharge pipe 17
Discharge from. The lubricating oil accumulated in the lubricating oil sump 18 at the bottom of the hermetic container 1 has its oil surface pressed by the high pressure refrigerant, and the shaft 10
Is guided through the lubricating oil feed passage 11 which penetrates from the lower end of the crankshaft 7 to the upper surface of the crankshaft 7. The lubricating oil that has been pushed up to the upper surface of the crankshaft 7 has a passage hole 5d formed in the swivel drive shaft 5c.
Enters the high-pressure chamber 19 provided against the thrust force of the high-pressure refrigerant in the compression chamber 12 on the swirl mirror plate 5a, and leaks the chip seal 20 provided on the contact surface between the back surface of the swirl mirror plate 5a and the upper surface of the frame 9. To the low pressure chamber 21. The lubricating oil introduced to the low pressure chamber 21 lubricates the Oldham ring 6 and
The fixed wrap 4b and the orbiting wrap 5b are lubricated in 2 and discharged together with the high-pressure refrigerant. However, when the electric motor 3 rotates at a low speed, the amount of lubricating oil rising from the lubricating oil sump 18 at the bottom of the hermetically sealed container 1 decreases, the lubricating oil cannot be sufficiently supplied to each sliding portion, and seizure may occur. .

[0003]

SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide an oil supply mechanism capable of supplying sufficient lubricating oil even at low speed rotation.

[0004]

According to the present invention, a compression section and an electric motor are arranged in a hermetic container, and the compression section is engaged with a spiral scroll and a fixed scroll to form a compression chamber. Scroll compression that includes a revolving scroll, an Oldham ring that prevents rotation of the revolving scroll, a shaft that pivotally drives the revolving scroll by forming a crankshaft at the upper end, and a frame that supports the crankshaft. In the machine, an oil reservoir opening upward is provided in a communication passage formed on the outer periphery of the fixed scroll and the frame to which the fixed scroll is fixed, and a through hole extending from the lower end of the oil reservoir to the lower surface of the crankshaft is provided in the frame. Is provided. Further, it is characterized in that a cross-sectional area of the oil reservoir is set to be 1/2 or more of a cross-sectional area of the communication passage.

[0005]

According to the present invention, the mist-like lubricating oil is discharged from the compression chamber together with the high-pressure refrigerant, and the lubricating oil is captured by the oil sump provided in the frame within the communication passage leading to the motor chamber, and the mist-like lube Lubricating oil can be guided through a through hole formed toward the lower end of the crankshaft. In addition, the opening of the oil reservoir is made large in order to capture a large amount of lubricating oil.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. This embodiment is the same as the conventional example shown in FIG. 2 except for the components related to the oil supply passage formed in the frame 9, and therefore the description of the overall configuration is omitted. Note that the same numbers are used for the same component numbers. As shown in FIG. 1, a communication passage 15 that connects the discharge chamber 14 a and the motor chamber 16 is formed along the sealed container 1 on the outer peripheral portion of the frame 9 and the fixed scroll 4 fixed to the frame 9. An oil reservoir 22 having an opening on the upper side of the frame 9 therein
Is provided. From the lower side of the oil sump 22 to the frame 9
The through hole 23 inclined toward the bearing portion that supports the crank shaft 7 is provided to supply the lubricating oil captured by the oil sump 22 to the bearing portion. The mist-like lubricating oil discharged from the compression chamber 12 together with the high-pressure refrigerant adheres to the discharge chamber 14a and the wall surface of the communication passage 15 to become liquid and flows down. Since the oil flows downward, an oil reservoir 22 having a large opening is provided above the communication passage 15 to capture the lubricating oil and secure an oil amount so as not to run out of oil. The surplus oil amount overflows in the oil sump 22 and is accumulated in the lubricating oil sump 18.

[0007]

As described above, according to the present invention, the oil reservoir is provided in the frame in the communication passage, the through hole is formed from the lower end to the lower end of the crankshaft, and the lubricating oil mist to be discharged is directly supplied to the bearing portion. As a result, it is possible to reliably supply oil without causing seizure of the rotating portion or the sliding portion due to insufficient oil amount, and it is possible to improve reliability.

[Brief description of drawings]

FIG. 1 is a vertical sectional view and an arrow sectional view showing an outline of an oil supply mechanism of a scroll compressor according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an outline of an oil supply mechanism of a conventional scroll compressor.

[Explanation of symbols] 1 sealed container 4 fixed scroll 5 orbiting scroll 5c eccentric drive shaft 5d passage hole 7 crankshaft 9 frame 10 shaft 11 lubricating oil feed passage 12 compression chamber 14 discharge port 14a discharge chamber 15 communication passage 16 motor chamber 18 lubrication Oil sump 22 Oil sump 23 Through hole

Claims (2)

[Claims] 1. A compression unit and an electric motor are arranged in a sealed container,
The compression part includes a spiral fixed scroll, an orbiting scroll that meshes with the fixed scroll to form a compression chamber, an Oldham ring that prevents rotation of the orbiting scroll, and a crankshaft at the upper end. In a scroll compressor configured by a shaft that orbits the orbiting scroll and a frame that supports the crankshaft, the fixed scroll and the fixed scroll are upwardly connected to a communication passage formed on an outer periphery of the frame. A scroll compressor, wherein an open oil reservoir is provided, and an inclined through hole extending from a lower end of the oil reservoir to a lower surface of the crankshaft is formed in the frame. 2. The scroll compressor according to claim 1, wherein the cross-sectional area of the oil reservoir is 1/2 or more of the cross-sectional area of the communication passage.