JPH03164587A - Scroll-type fluid compressor - Google Patents

Abstract

PURPOSE:To reduce bearing functioning to a bearing unit by providing an elastic body in a space where a scroll member rotates in a scroll-type fluid compressor used as a coolant compressor for freezing and air-conditioning or as an air compressor. CONSTITUTION:A turning scroll 1 rotates by an eccentric amount of an eccentric axis connected to a rotating axis without autorotation with respect to a fixed scroll 2, whereby centrifugal force F1 functions to the turning scroll 1. An inertial force reducing mechanism is composed of the turning scroll 1, a fixing bolt 6 attached to a frame 4 and a coil spring 7 mounted on the fixing bolt 6, and four mechanisms are provided at four positions with equal intervals along a circumference. Spring drag F2 functions in a reverse direction to a direction to which the centrifugal force F1 generated by rotation of the turning scroll 1 functions, while inertial force applied to the turning scroll is reduced by the spring drag so that bearing to a bearing unit 1a can be reduced.

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 or air conditioning, or a scroll fluid compressor used as an air compressor.

[Conventional technology]

As an example of a scroll-type fluid machine, the structure of a conventional hermetic scroll compressor for refrigerant air conditioning will be explained with reference to FIG.

This figure shows an example of a vertical compressor in which the compression mechanism is arranged in the upper part of the main body and the electric motor part is arranged in the lower part of the main body. Fixed scroll 2. Drive shaft 3. It consists of a frame 4 and an automatic prevention mechanism 5, and the orbiting scroll 1 is provided with a bearing 1a into which a crank portion of a drive shaft 3 is inserted.

[Problem to be solved by the invention]

In the above conventional technology, when rotating at high speed using an inverter drive device or the like, the inertia force (centrifugal force) due to the orbiting motion of the orbiting scroll 1 increases in proportion to the square of the rotation speed. The surface pressure at the part also increases,
There were problems with bearing wear and seizure.

An object of the present invention is to provide a scroll fluid compressor that can reduce surface pressure applied to a bearing portion and rotate at high speed.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a structure in which an elastic body is provided in the space in which the scroll member orbits, and the elastic force of the elastic body is used to cancel the inertial force acting on the orbiting scroll.

[Effect]

The orbiting scroll rotates without rotating relative to the fixed scroll by the amount of eccentricity of the eccentric shaft connected to the rotating shaft, and as a result, the elastic body provided on the orbiting scroll is also displaced, and the elastic body has a displacement. This generates a drag force corresponding to the amount of force, which cancels out the inertial force (centrifugal force) acting on the orbiting scroll, so the surface pressure acting on the bearing of the orbiting scroll can be reduced, allowing high-speed rotation.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a longitudinal sectional view of a hermetic scroll compressor according to the present invention. In the figure, the inertia force reduction mechanism consists of orbiting scroll 1. It also includes a fixing bolt 6 attached to the frame 4 and a coil spring 7 attached to the fixing bolt 6.

Next, the operation of this embodiment will be explained. FIG. 2 shows a cross-sectional view taken along the line ■-■ in FIG.

Y-axis) is attached.

This figure shows a case where the orbiting scroll 1 is displaced in the positive direction of the X-axis by an amount of eccentricity r of an eccentric shaft connected to the drive shaft during operation of the compressor.

A centrifugal force F1 expressed by the following formula acts on the orbiting scroll 1 in the positive direction of the X-axis due to the orbiting motion.

Fz=m r (11”
...(1) Here, Fl : Centrifugal force m : Orbiting scroll mass r : Turning radius ω : Rotation angular velocity On the other hand, in this embodiment, the coil springs 7 are installed at equal intervals around the circumference, and the coil springs 7 are The degree of freedom a is here, Q
= Coil spring free length do: Frame inner diameter dl: Set to orbiting scroll outer diameter. Therefore, the coil spring 7a on the X axis
7c is contracted by the turning radius r, while 7c is extended by 1 minute, so a drag force Fz shown by equation (3) acts on the orbiting scroll in the negative direction of the X axis.

Fz= 2 k r ・=
(3) Here, Fz: Spring drag force k: Spring constant r: Turning radius, that is, the spring drag force acts in the opposite direction to the direction in which the inertial force (centrifugal force) generated by the orbiting motion of the orbiting scroll acts. , the inertia force applied to the orbiting scroll is reduced by the spring resistance force.

Therefore, since the surface pressure applied to the bearing portion 1a of the orbiting scroll can be reduced, bearing reliability can be improved.

〔Effect of the invention〕

According to the present invention, since the centrifugal force applied to the orbiting scroll can be reduced, the bearing surface pressure of the orbiting scroll can be lowered, and a scroll fluid machine capable of high speed rotation can be provided.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is a sectional view of a conventional scroll compressor. 1... Orbiting scroll, 2... Fixed scroll, 3
... Drive shaft, 4 ... Frame, 5 ... Anti-rotation mechanism, 6 Kaya mouth rod

Claims (1)

[Scope of Claims] 1. A fixed scroll member and an orbiting scroll member having a spiral wrap standing upright on an end plate, the wraps are meshed inwardly, and the orbiting scroll member is engaged with an eccentric shaft portion connected to a rotating shaft. , the orbiting scroll member is caused to orbit relative to the fixed scroll member without rotating; the fixed scroll member is provided with a discharge port that opens at the center and an intake port that opens at the outer periphery; and the gas is supplied from the intake port. In the scroll fluid compressor, the scroll fluid compressor sucks in gas, moves the compressed gas around a compression chamber space formed by the orbiting scroll member and the fixed scroll member to reduce the volume, compresses the gas, and discharges the compressed gas from the discharge port. A scroll fluid compressor characterized in that an elastic body is provided in a space in which an orbiting scroll member orbits, and the elastic force of the elastic body reduces inertia force generated in the orbiting scroll member. 2. The scroll fluid compressor according to claim 1, wherein a coil spring is provided as the elastic body.