JPS61261689A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent a bearing part from wearing, by arranging a balance weight, canceling centrifugal force of a turning scroll, while a balance weight, canceling reaction force of compressed gas, to be shifted at a predetermined angle in a crankshaft. CONSTITUTION:The first balance weight 14, canceling centrifugal force F1 by dead weight of a turning scroll, is mounted to a crankshaft 10 fitted to a back surface boss in the turning scroll. And the second balance weight 26, canceling reaction force of compressed gas in a working chamber, is mounted to a position at a predetermined angle delayed from the above position. In this way, a compressor, enabling stress acting on a sliding surface of the crankshaft 10 to be all cancelled, enables wearing in a bearing part to be remarkably decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a scroll compressor used as a refrigerant compressor for refrigeration and air conditioning, or as a compressor for air or other gases.

Conventional technology Taking a vertical oil-fed scroll compressor for refrigeration and air conditioning as an example,
The basic configuration will be explained with reference to FIGS. 4 and 5. 1 is an orbiting scroll, 2 is a fixed scroll,
The fixed scroll 2 has a spiral wrap 2a that stands upright on an end plate 2b, and the orbiting scroll 1 has substantially the same shape as the fixed scroll 2 and has a wrap 1a and an end plate 1b.
These scrolls 1 and 2 are engaged with each other with the laps la and 2a facing inside. In this configuration, when the orbiting scroll 1 is rotated in the clockwise direction, as shown in FIG. Chambers 3a and 3b
The refrigerant gas sucked from the suction port 4 into the compression chamber located on the outermost side of the compression chamber is hermetically sealed. Furthermore, the compression chamber 3a
.

The volume of the refrigerant gas 3b gradually decreases as the orbiting scroll 1 rotates, and the pressure of the refrigerant gas increases, and the refrigerant gas is discharged from the central discharge port 5. This is the operating principle of a scroll compressor.

Further, a rotation prevention mechanism called an Oldham ring 8 is provided between the frame 7 to which the fixed scroll 2 is fixed and the orbiting scroll 1. A rotor lla of an electric motor 11 is joined to a crankshaft 10 which is fully supported for rotation by a bearing 9 of a frame 7, and a stator 11b held in a frame 7 or an airtight container 12 rotates the crankshaft IO. The orbiting scroll 1 can rotate around the central axis of the bearing section 9 of the frame 7 with its end plate 1b sandwiched between the end plate section 2c of the fixed scroll 2 and the pedestal 13 of the frame 7. The eccentricity of the crankshaft 10 is ε
The eccentric shaft portion 10a is fitted into an orbiting bearing 22 provided on the opposite side of the end plate 1b of the orbiting scroll 1 from the spiral body 1a, and the eccentricity ε is such that the eccentricity ε of the orbiting scroll l This is the turning radius. Furthermore, a first balance weight 14 is integrally formed on the crankshaft 10 for offsetting the centrifugal force generated by the eccentric shaft portion 10a of the orbiting scroll 1.

Next, the operation of the compressor will be explained with reference to FIG. 5 according to the flow of refrigerant gas and lubricating oil. Low-pressure refrigerant gas is led from the suction pipe 15 and reaches the compression chamber 3 formed by the fixed scroll 2 and the orbiting scroll 1 through the suction port 4 of the fixed scroll 2 . The refrigerant gas that has entered the compression chamber 3 is gradually compressed by the orbiting movement of the orbiting scroll 1 as described in the operating principle, moves to the center of the scroll, increases the pressure, and is discharged from the central discharge port 5 into the closed container 12. is discharged. The discharged high-pressure refrigerant gas fills the lower space 18 of the closed container 12 through the upper space 16 and the passage 17 in the closed container 12, and is guided to the outside through the discharge pipe 19.

Next, the flow of the lubricating oil 20 will be explained with reference to FIG. The lubricating oil 20 is stored in the lower part of the sealed container 12, and the lubricating oil 20
The lower end of the crankshaft 10 immersed therein is in an atmosphere of high pressure discharge force. A vertical hole 21 for supplying oil to each bearing portion is formed in the crankshaft 10 from the lower end to the upper end surface. A pressure-separated back pressure chamber 23 is provided around the orbiting bearing 22 of the orbiting scroll 1 in order to maintain the thrust force that the orbiting scroll 1 receives due to the pressure of the refrigerant gas being compressed. The high-pressure lubricating oil 20' supplied from the vertical hole 21 of the crankshaft 10 is caused by low-pressure gas leaking from the gaps between the end plate 1b of the orbiting scroll 1, the end plate 2c of the fixed scroll 2, and the pedestal 13 of the frame 7. It creates an atmosphere of pressure. Therefore, the closed container 12
Lubricating oil 20 in a high-pressure atmosphere accumulated at the bottom of the crankshaft 10 rises through the vertical hole 21 of the crankshaft 10 due to the pressure difference, and supplies oil to sliding parts such as bearings. The lubricating oil leaking into the compression chamber 3 is compressed together with the refrigerant gas, moves to the lower part of the closed container I2 via the discharge port 5 and the passage I7, rapidly decreases the flow velocity, and falls to the bottom of the container under its own weight.

That is, the lubricating oils 20 and 20' are used for oil supply, heat source, separation,
Reservations are repeated.

Problems to be Solved by the Invention FIG. 6 shows the crankshaft 10 and eccentric shaft portion 10 in FIG.
a is a perspective view of the first balance weight 14;
The figure is a plan view of FIG. 6 viewed from arrow A. The centrifugal force F0 generated because the center 30 of the eccentric shaft portion 10a fitted in the orbiting bearing 22 of the orbiting scroll 1 is eccentric with respect to the rotation center 31 of the crankshaft 10 is offset by the balance weight 14. However, due to the pressure generated when the compression chamber moves from the outside to the center while decreasing its volume, a force F3 in a direction perpendicular to F is generated, so that the eccentric shaft portion 10
a and the crankshaft IO are tilted, and the frictional resistance at the bearing portion 9 increases.

The present invention solves the above problems, and aims to provide a scroll compressor that can offset and reduce the force F mentioned above.

Means for Solving the Problems In order to solve the above problems, the present invention provides a second balance weight, which is a balancing component for reducing and canceling out the force exerted on the crankshaft and the eccentric shaft due to the pressure inside the compression chamber. 1st
The balance weight is provided on the crankshaft at a position delayed by a predetermined angle with respect to the direction of rotation of the crankshaft.

Function: Due to the air-filled structure of the present invention, the pressure in the compression chamber causes a force in the opposite direction to the force applied to the crankshaft and the eccentric shaft portion to be generated by the centrifugal force of the second balance weight. Since the friction is offset and reduced, the friction in the bearing section is reduced.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
The figure and FIG. 2 show a first embodiment.

The same reference numerals as in FIG. 5 indicate the same parts, and the explanation thereof will be omitted. A second balance weight 26 is attached to and integrated with the crankshaft 10 at a position 90° behind the first balance weight 14 with respect to the rotational direction of the crankshaft 10, and when the crankshaft 10 is rotated, By generating centrifugal force in the second balance weight 26, the compression chamber 3
The internal pressure offsets and reduces the force applied to the eccentric shaft portion 10a and the crankshaft 10. Here, the force exerted on the crankshaft 10 and the eccentric shaft part 10a due to the pressure in the compression chamber 3 always shows a constant direction with respect to the crankshaft 10 and the eccentric shaft part 10a, and the second balance weight 2
6 is applied, that is, the center of gravity of the second balance weight 26 is 180° opposite to the force F generated by the pressure inside the compression chamber 3 with respect to the center of rotation of the crankshaft 10. A second balance weight 26 is attached to the crankshaft 10.

In this way, according to this embodiment, by providing the second balance weight 26, when the crankshaft 10 is rotated at a certain rotation speed, the pressure inside the compression chamber 3 can be applied to the crankshaft 10 and the eccentric shaft portion 10a. Theoretically, when this force and the centrifugal force generated in the second balance weight 26 are balanced, the crankshaft 10 and the eccentric shaft portion 10a due to the pressure inside the compression chamber 3
The slope of will disappear. Further, at other rotational speeds, the inclination due to the force applied to the crankshaft 10 and the eccentric shaft portion 10a can be reduced.

Next, a second embodiment of the present invention will be described with reference to FIG. As shown in the first embodiment, the second balance weight 26 is attached and integrated with the crankshaft 10, and the auxiliary member 27 is attached to the second balance weight 26 with the screw 28.
By making it removable, it is possible to change the centrifugal force when it is rotated.

Effects of the Invention As described above, by providing the second balance weight, the present invention can reduce the inclination of the crankshaft and the eccentric shaft part due to the pressure in the compression chamber, and the increase in frictional resistance that occurs in the bearing part. can.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the second balance weight, crankshaft, and eccentric shaft portion in the first embodiment of the present invention, FIG. 2 is an overall view of the compressor in the first embodiment of the present invention, and FIG. The figure is a perspective view of a second balance weight, its auxiliary member, a crankshaft, and an eccentric shaft portion in a second embodiment of the present invention.
Fig. 4 is a cross-sectional view illustrating the meshing state of the orbiting scroll and fixed scroll, Fig. 5 is a longitudinal sectional view of a conventional hermetic scroll compressor, and Fig. 6 is a conventional crankshaft, eccentric shaft, and A perspective view of the balance weight, Figure 7 is the 6th
FIG. 2 is a plan view of the figure viewed from arrow A; 1... Orbiting scroll, 2... Fixed scroll, 3
... Compression chamber, 8... Oldham ring, 10... Crankshaft, 10a... Eccentric shaft portion, 14... First balance weight, 26... Second balance weight,
27... Auxiliary parts agent Yoshihiro Morimoto Figure 1 Figure 2 9--Orda λsu〉ku

Claims (1)

[Claims] 1. an orbiting scroll formed by standing a spiral wrap upright on an end plate that is eccentrically driven by a crankshaft; a fixed scroll having substantially the same shape as the orbiting scroll; and wraps of the orbiting scroll and the fixed scroll arranged inside each other. A compression chamber is formed by the orbiting scroll and the fixed scroll when the orbiting scroll is rotated so as not to apparently rotate, and a centrifugation occurs because the orbiting scroll is eccentric with respect to the crankshaft. a first balance weight provided on the crankshaft so as to cancel the force, and a scroll compression device that compresses fluid by reducing the volume of the compression chamber while moving the compression chamber from the outside to the center. A second balance weight, which is a balance component for offsetting and reducing the force exerted on the orbiting scroll and the crankshaft due to the pressure generated in the compression chamber, is attached to the first balance weight.
A scroll compressor further provided on the crankshaft at a position delayed by a predetermined angle with respect to the rotational direction of the crankshaft than the balance weight of the scroll compressor.