JPS61155682A - Rotary compressor - Google Patents

Abstract

PURPOSE:To prevent generation of seizure between a main shaft and a main bearing, by forming in the periphery of the main shaft a hollow part of a rotor cutting it from its bottom end surface and positioning an upper end surface of the main bearing higher than the bottom end surface of the rotor so as to reduce a margin of deflection in the main shaft even when it rotates at a high speed. CONSTITUTION:A rotor 23, being cut from its bottom end surface, forms a hollow part in the periphery of a main shaft 10, and the upper end surface of a main bearing 16, being placed in said hollow part, is situated in the vicinity of the center of gravity of the rotor 23. While a compressor is in operation, an impeller pump 22, provided in the bottom of the main shaft 10, carries lubricating oil 4 to a cut groove (not shown in the drawing) in an internal wall of the main bearing 16 further to an upper end surface of the main shaft 10. During this time, the lubricating oil is carried into a part between the main shaft 10 and the main bearing 16, forming an oil film. While the main shaft 10, by the above constitution, enables its deflecting margin by the main bearing 16, and the compressor, even when it is in high speed operation, can prevent seizure by forming the oil film between the main shaft 10 and the main bearing 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a compressor that prevents seizure at the contact surface between an L1 main shaft and a main bearing.

[Technical field of invention]

Conventionally, the configuration near the main shaft of a rotary compressor was as follows.

An eccentric crank part fits in the lower part of the main shaft, and a roller is rotatably attached to the outer periphery of the crank part. Since the crank part and the rollers are eccentric with respect to the main shaft, when the main shaft rotates, a large centrifugal force is generated in one direction. In order to create a centrifugal force that balances that centrifugal force, the end rings attached to the top and bottom of the rotor have different shapes. However, the centrifugal forces that balance in the horizontal direction also create a moment in the main axis when viewed vertically. Therefore,
The main shaft deflects during rotation.

A main bearing 100 shown in FIG. 5 is provided on the outer periphery of the main shaft above the crank portion. A cut groove 102 is provided on the inner surface of the main bearing 100, extending above the lower end and extending to the groin, inclined in the direction of rotation of the main shaft.

The case where four sources of commercial voltage and commercial frequency are applied in such a configuration will be described below.

When the main shaft rotates, lubricating oil is supplied to the lower end of the kerf 102 by a vane pump at the lower end of the main shaft.

The lubricating oil tends to move in the direction of rotation of the main shaft due to its own viscosity. Therefore, the I-threshold oil is supplied from the lower end to the upper end of the kerf 102. The lubricating oil in the kerf 102 enters between the main shaft and the main bearing 100 and forms an oil film to prevent seizure.

[Problems with conventional technology]

In recent years, in order to improve the refrigerating capacity of rotary congressors, inverters have been used to increase the operating frequency. However, as the operating frequency increases, the swing width of the main shaft increases. Therefore, it begins to come into contact with the upper part of the inner wall surface of the main bearing 100, and heat generation begins. The viscosity of the lubricating oil decreases when the temperature increases, making it impossible to form a sufficient oil film between the main shaft and the main bearing 1000. As a result, seizure occurred, causing the compressor to stop and cause a "C" problem.

The above matters occur at a certain operating frequency.

The frequency varies depending on the compressor model, but 1
This problem sometimes occurs at frequencies above 30 Hz, which has been a problem for improving refrigeration capacity.

[Purpose of the invention]

The present invention has been made to solve the above problems,
The purpose of this is to prevent seizure by reducing the width of the main shaft during high-speed rotation and by forming a sufficient oil film between the main shaft and the main bearing.

[Summary of the invention]

In the present invention, the roller is cut out from the lower end surface to form a recess around the main shaft, and the upper end surface of the main bearing is positioned above the lower end surface of the rotor, thereby reducing the swing width of the main shaft during rotation. It is something.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

1 and 2 are a vertical WT view and a horizontal sectional view of the rotary p-aggressor of the present invention. Reference numeral 1 denotes a cylindrical container with an open top, and a closed space 3 is formed by closing the top opening of the container 1 with an upper container 2. The container 1 and the upper container 2 are integrally fixed by welding or the like. Lubricating oil 4 is stored in the lower part of the container 1.

Next, the compression mechanism section will be described. A cylinder 5 half immersed in lubricating oil 4 is press-fitted into the lower part of the container 1. A circular through lower portion forming a compression chamber 6 and a through groove 8 are provided in the center of the cylinder 5 . A sub-bearing 9 that covers the through-lower is fixed to the lower surface of the cylinder 5 with a bolt (not shown). A subshaft 12 is rotatably inserted into the bearing portion of the sub-bearing 9. A subshaft 2 is formed on the lower surface of an eccentric shaft 11 that is integrally formed at the lowermost end of the main shaft 10 and has a center eccentric from the rotation axis of the main shaft 10. A roller 13 is inserted into the outer periphery of the eccentric shaft 11'. A blade 14 having the same height as the row 213 is slidably housed in the through groove 8, and one end contacts the peripheral wall of the roller 130, and a spring 15 is inserted into the space in the through hole #8 between the other end and the container 1. Store it, spring 15
It is in contact with the peripheral wall of the roller 13 due to its elastic force. A main shaft 10 is inserted into the upper surface of the cylinder 5, and a main bearing 16 is provided so as to cover the through lower part and is fixed by a bolt (not shown). The main bearing 16 is provided with a discharge port 17, and a discharge valve 18 is provided to cover this port. The discharge 77 19 is fixed to the main bearing 16 and forms a space for temporarily storing discharged gas. This discharge muff 219 is provided with an opening 20 on the wall surface opposite to the discharge valve 18 with respect to the main shaft 10, and gas is discharged into the sealed space 3 through this opening. The interior of the main shaft 10 is hollow, and a vane pump 22 for scooping up the lubricating oil 4 is mounted below.

Next, we will discuss the electric motor section. The main shaft 10 is press-fitted into an aluminum die-cast rotor 23 and is integrally formed with the main shaft 10. An end ring 27 and an end ring 28 are fixed to the top and bottom of the rotor 23,
The end ring 27 is heavy on the eccentric side of the main shaft, and the end ring 28 is heavy on the opposite side, so that the centrifugal force generated during operation is evenly matched. A stator 24 press-fitted into the container 1 is provided outside 11411 of the rotor 23 . Moreover, an oil disk 25 having an oil separation function is fixed above it. There are two places between the stator 24 and the container 1, and the stator 24
A pipe 26 extends from the upper end to the lower end of the cylinder 5 and forms a space for returning lubricating oil, and the lower end of the pipe 26 is immersed in the lubricating oil. A discharge pipe 32 is fixed to the cover 2.

In the rotary compressor having such a structure, according to this embodiment, the rotor 23 is cut out from the lower end surface, and the main shaft 1
A recess is formed around 0.

The upper end surface of the main bearing 16 enters this recess, and the rotor 23
is located near the center of gravity.

Next, the operation of the rotary compressor based on the above configuration will be explained. When four sources of one commercial voltage and one commercial frequency are applied to the electric motor part from the source terminal of the rotary compressor (not shown), the rotor 23 starts to rotate, and the main shaft 10 integrated therewith also rotates. As the main shaft rotates 100 times, the roller 13 rotates eccentrically within the cylinder 5. Due to this eccentric rotation, the compression [6] formed by the through lower and the roller 13 changes the volume and repeats the compression operation. Through this compression operation, the refrigerant gas sucked in from the refrigerant supply pipe 35 is compressed in the compression chamber 6, discharged from the discharge port 17 and the discharge valve 18 into the space of the muffler 19, and exits from the closed space 3 through the opening 20 of the muffler 19. . Then, the discharge gas passes upward through the gap between the rotor 23 and the stator 24 and the gap between the stator 24 and the container 1, and exits from the discharge pipe 32.

The lubricating oil 4 is carried by a vane pump 22 located below the main shaft 10 to a not-illustrated groove in the inner wall of the main bearing 16. Then, due to its own viscosity and 100 rotations of the main shaft, it is carried to the upper end surface of the main shaft 10.

During this time, lubricating oil enters between the main shaft 10 and the main bearing 16 and forms an oil film. The main shaft 10 can reduce the vibration amplitude by the main bearing 16, and even during high-speed rotation, the main shaft 10
An oil film is formed between the main bearing 16 and the main bearing 16 to prevent seizure.

The sliding area between the main shaft 10 and the main bearing 16 can be determined by making the diameter of the central part of the main shaft 10 slightly smaller or by slightly increasing the diameter of the central part of the main bearing 16, as shown in FIGS. 3 and 4. By doing so, the supporting area can be made comparable to the conventional one.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce the runout #& of the main shaft even during high-speed rotation, and to prevent seizure between the main shaft and the main bearing.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are perspective views of a first bearing according to an embodiment of the present invention. 5...Cylinder 10...Main shaft 11...Crankshaft 13-...Roller 16...Main bearing 23
... Rotor's agent Patent attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] A roller rotatably housed in a cylinder, a main shaft attached to the roller via a crankshaft and led out of the cylinder, a main bearing supporting the main shaft, In a rotary compressor, the rotor is cut out from the lower end surface to form a recess around the main shaft, and a recess is formed around the main shaft, and a recess is formed around the main shaft, and the rotor is cut out from the lower end surface of the rotor to compress gas introduced into the cylinder by rotation of the roller. A rotary compressor characterized in that the upper end surface is located above the lower end surface of the rotor.