JPS5968584A - Scroll compressor - Google Patents

Abstract

PURPOSE:To contrive to shorten the machining time and to lower the price by a structure wherein a rocking mechanism, which is rotatably supported in a hole on the top surface of a housing coupled with a fixed scroll and at the same time provided with a moving shaft slidably inserted in a hole on the underside of a rocking scroll at the upper part of the rocking mechanism, is provided. CONSTITUTION:The circular rocking member 15, which is rotatably supported in the hole 14b formed on the top surface of the housing 14 supporting a crankshaft 3 through a radial bearing 14a and yet coupled with the fixed scroll and at the same time provided with the moving shaft 15a slidably inserted in the hole 2d formed on the underside of the rocking scroll 2 at the upper part of the rocking member, is formed. Due to the structure as mentioned above, an Oldham's coupling, which is necessary in a conventional device for the rocking motion of the rocking scroll 2 and requests long machining time and yet high in cost, is eliminated and consequently the rocking mechanism is simplified in constitution and made smaller in size and at the same time facilitated in manufacture, resulting in enabling to contrive to lower the price and to improve the reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a scroll compressor used for refrigeration or air conditioning.

Figures 1 to 8 show conventional examples of this type of device. Department (
It forms an inlet part (1b) for inhaling two low-pressure gases, and a discharge port (1b) for discharging compressed high-pressure gas at the upper center (-).
IC) is provided. (2) is an oscillating scroll equipped with teeth (2a) having the same shape as the teeth (1a) of the fixed scroll (1), and a bottom plate (2b) supporting the teeth (2a) and a bottom plate (
2b) lower surface (2 is the eccentric shaft (2C) that supports the central part and the protrusion (2) that guides the left and right movement of the swinging scroll (2)
2d) is provided. (3) is an oscillating scroll (2)
The upper part of the crankshaft that causes the eccentric shaft (2C) to perform eccentric movement.

The eccentric shaft (2C) is slidably inserted into the eccentric hole (3a).
) is provided. (4) is fixed to the lower part of the crankshaft (3), and the rotor core (5) of the motor that drives the crankshaft (3) winds the stator coil (5a) and drives the first rotor core (4). Stator core 7 (6) that generates torque
is a housing (6a) that is connected to the lower part of the fixed scroll (1) and supports the thrust load and radial load from the oscillating scroll (2) and the rotor core (5).
(6b) is a thrust bearing, and (6C) is a radial bearing. (7) is a link-shaped recess (
6d) is a ring-shaped Oldham joint that guides the oscillating scroll (2) from the front to the rear left and right, and the upper part (2) guides the protrusion (2d) of the oscillating scroll (2).
7a) and a guide groove (6) formed in the housing (6) at the bottom.
A projection (7b) guided by the guide groove (7b) is provided, and the center line of the guide groove (7a) and the center line of the projection (7b) are perpendicular to each other. (9) is an airtight container that houses and supports the compression element and the electric element;
) is a discharge pipe that discharges high-pressure gas discharged from the discharge port (IC) to the outside of the closed container 0u.

With the above structure, the oscillating scroll (2) is eccentrically driven from the crankshaft t3) by the rotation of the electric motor, but the oscillating scroll (2) is... The protrusion (2) of the oscillating scroll (2) is inserted into the guide groove (7a) of the movable Oldham joint (7).
d), and is guided in the left and right direction via the swinging scroll (2
) rotates at a predetermined radius and performs a so-called rocking motion. As a result, the space created between the teeth (1a) of the fixed scroll (1) and the teeth (2a) of the oscillating scroll (2), that is, the compression chamber, moves to the center while reducing its volume, and the discharge port ( compressed gas is discharged from the IC). Figure 8 shows a state in which the volume of the compression chamber is reduced as the oscillating motion of the oscillating scroll (2) progresses, and the center point of the fixed scroll (11) is placed at the center end of the oscillating scroll (2). If the center point is P, the center side end of the swinging scroll (2) swings and rotates with the 0 point as the center and OP as the radius. Point Q moves parallel to point P with the same radius.

The length of the radius OP is equal to the eccentricity of the eccentric shaft (2c) of the oscillating scroll (21) with respect to the crankshaft (3).
In figure (a), compression chambers (11a) (11b) are shown from the outside.
)(11c)(], 1d), and as the rocking motion progresses, each compression chamber moves toward the center while reducing its volume. In Figure 8, (a) the angle of swing rotation is 0°, (b) is 90°, and (C) is 1so0. (
d) shows the case of 270°.

By the way, in a conventional device having two or more configurations, an Oldham joint (7) is required to swing the swinging scroll (2).This Oldham joint (7) is formed in an annular shape, The center line of the guide groove (7a) formed on the upper surface of the ring part (7C) and the protrusion (7b) formed on the lower surface
) It is necessary to maintain a perpendicularity with the center line of the housing (6) with high precision, which requires a lot of machining time.
6e) is located within the recess (6d) of the crank (6),
However, since the groove is closed at both ends, it also has the drawback of requiring a lot of processing time and increasing costs.

The present invention aims to improve the above-mentioned drawbacks of the conventional compressor, and provides a scroll compressor equipped with a swinging mechanism that has a simple configuration.

An embodiment of the present invention will be described below with reference to FIGS. 9 to 11. FIG. In the figures, the same reference numerals as in Figures 1 to 8 indicate the same or corresponding parts, and 02) is the crank 111.
The eccentric shaft (121) is installed at the bottom of the bottom plate (2b) of the oscillating scroll (2), and the eccentric shaft (121) is slidably inserted into the eccentric hole (13a).
The eccentric bearing comprising the fixed scroll (15) is connected to the fixed scroll (15) and supports the crankshaft (3) via the radial bearing (14a);
4) A movable structure that is rotatably supported (= supported) in the hole (14b) formed on the upper surface (near 11) and slidably inserted into the hole formed in the lower surface of the swinging scroll (2) at the upper part.
(15a) is a circular β guide member. As shown in Fig. 10, the center line of the crank Ill+31 is X, the center line of the eccentric line is Y, the center line of the guide member Q51 is R1, the center line of the movable shaft (15a) is 8. The position of the center #i!R of the guide member (15) can be any position on the upper surface of the movable 1141
] (15a) The center position S is on the circumference of a radius e centered on point R (there are two).

The position of the hole (2d) in the swinging scroll (2) that supports the movable shaft (15a) is set so that R8/XY is maintained. In the spear 1° diagram, Sa is the eccentricity q4I] The movable axis when the center point Y of 021 rotates 2700 times and reaches the Ya point (
The position of the center point of 15a) is shown as YaSa/XR, indicating that it always moves parallel to XR.

That is, each part of the swinging scroll +21 has a different center point, but all swing and rotate with a radius e parallel to XR. FIG. 11 is an exploded perspective view showing each part of the swing mechanism.

As described above, according to the present invention, a guide member is provided on the lower surface of the oscillating scroll and a guide member is provided on the lower surface of the oscillating scroll. Since the above-mentioned movable shaft is slidably supported by a hole and a two-up swinging mechanism is constructed, the structure is simplified, the swinging mechanism is downsized, and it is easy to manufacture, resulting in an inexpensive and highly reliable scroll. A compressor can be provided.

[Brief explanation of the drawing]

Figures 1 to 8 show conventional examples, Figure 1 is a longitudinal sectional view, Figure 2 is a perspective view of the fixed scroll, Figure 3 is a perspective view of the fixed scroll from below, and Figure 4 is a swing. A perspective view of the moving scroll, Figure 5 is a perspective view of the swinging scroll seen from below,
Fig. 6 is a perspective view of the housing, Fig. 7 is a perspective view of the Oldham joint,] - Fig. 8 is an explanatory diagram showing the progress of the rocking movement,
Figures 9 to 11 show one embodiment of the present invention. Figure 9 is a vertical sectional view of the main parts, Figure 10 is an explanatory diagram of the operation, and Figure 11 is an exploded perspective view of the main parts. be. In the figures, the same reference numerals indicate the same or corresponding parts, (1
) is a fixed scroll, (1a) is a tooth, (2) is an oscillating scroll, (2a) is a tooth, (2d) is a four part, (3) is a crankshaft, (lla) (llb) (lie) (li
d) is the compression chamber, (1z is the eccentric shaft, the circle is the housing, (14b) is the recess, +151
is a guide member. (15a) is a movable shaft. Agent Makoto Kuzuno - Yuki 1 Yuki 2 N version 3 N Mizu 4 Figure CL Fuki 8 d (cI-)

Claims (1)

[Claims] A fixed scroll in which plate-shaped teeth are formed in a spiral shape. An oscillating scroll having teeth of the same shape as the teeth of this fixed scroll is fitted facing each other, and compression is formed between the teeth of the fixed scroll and the oscillating scroll by the oscillating movement of the oscillating scroll. In a scroll compressor that moves to the center while reducing the volume of the chamber and discharges compressed gas from the center, the oscillating scroll is driven by an eccentric shaft of the crankshaft (a housing that supports the crankshaft). A rotatable guide member is provided in the recess formed on the upper surface (2), and a movable shaft is provided eccentrically to this guide member. Additionally, a line connecting the center of the guide member and the center of the movable shaft is set to be equal in length and parallel to a line connecting the center of the crankshaft and the center of the rotation axis. scroll compressor.