JPS6114493A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prepare the rotation preventing mechanism of a movable scroll at a low cost by forming a tooth groove onto the outer periphery of the boss of a movable scroll and forming a tooth groove onto the inner periphery of a frame and installing a planetary gear apparatus which is engaged between the both tooth grooves and revolves with a main shaft. CONSTITUTION:Though, when a crankshaft 3 turns by one turn counterclockwise, also a movable scroll 2 tends to revolve by one turn, a gear 30 is meshed with the gear 25 on the inner peripheral surface of a housing 23 and revolves clockwise, as a supporting base 27 installed onto the crankshaft 3 shifts. Though said revolution is transmitted to a gear 28, the gear 28 revolves counterclockwise, and revolves a gear 26 formed onto the boss 22 of the movable scroll clockwise. Therefore, the movable scroll performs only swing movement, and rotation is prevented. Since the gear can be simply prepared by using injection molding, a rotation preventing mechanism can be prepared at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a scroll compressor, and more particularly to an improvement in an anti-rotation mechanism necessary for causing an oscillating scroll to oscillate.

[Prior art]

Conventionally, this type of scroll compressor was manufactured by patent application No. 57-188.
Proposed in No. 811. This conventional scroll compressor will be explained with reference to FIGS. 1 to 8. This scroll compressor consists of a fixed scroll l having plate-shaped teeth 1a spirally shaped in a counterclockwise direction when viewed from two sides. Contains.

The fixed scroll 1 has a suction part 1b for sucking low-pressure gas on its outer circumference, and a discharge port IC for discharging compressed high-pressure gas at the upper center. Further, the scroll pressure m machine includes an oscillating scroll 2 having teeth 2a having the same shape as the teeth 1a of the fixed scroll 1. This swinging scroll 2 has a bottom plate 2b that supports teeth 2a.
An eccentric shaft 2c supporting the central portion of the scroll 2 and a protrusion 2d guiding the movement of the swinging scroll 2 from side to side are provided on the lower surface of the scroll 2b.

A crankshaft 3 is disposed in the scroll compressor, and an eccentric hole 3a is formed in the upper part of the crankshaft 3, into which the eccentric shaft 2c of the oscillating scroll 2 is slidably inserted at a position eccentric to the rotational axis of the crankshaft. Eccentric motion is imparted to the eccentric shaft 2c of the oscillating scroll 2 inserted into the eccentric hole 3a. A rotor core 4 of an electric motor is fixed to the lower part of the crankshaft 3, and a stator core 5 around which a stator coil 5a is wound is arranged to generate a driving torque in the rotor core.

A housing 6 that supports the thrust load and radial load from the oscillating scroll 2 and the rotor core 4 is arranged on the lower surface side of the fixed scroll 1, and the housing 6 is connected to the outer lower surface of the fixed scroll 1. A thrust bearing 6a is arranged between the housing song 6 and the orbiting scroll 2, and a thrust bearing 6b is also arranged between the housing 6 and the lower surface of the shoulder of the crankshaft 3.

On the other hand, a radial bearing 6c is arranged between the outer peripheral surface of the portion of the crankshaft 3 having the eccentric hole 2C and the housing 6.

A ring-shaped recess 6d is formed on the upper surface of the housing 6, and a guide groove 6e is formed on the bottom of the recess in a straight line passing through the center thereof. A ring-shaped Oldham's joint 7 as shown in FIG. 7 is disposed within this recess, and a protrusion 7b that fits into a guide groove 6e formed on the bottom of the recess is provided on the lower surface of the Oldham's joint 7. A guide groove 7d that fits and guides a protrusion 2d provided on the lower surface of the swinging scroll 2 is formed on the upper surface on an imaginary center line perpendicular to the imaginary center line on which the protrusion 7b is located.

The fixed scroll 1 and the swinging scroll 2, compression elements such as the housing 6 that support them, and the electric motor are housed and supported in a closed container 8.

A suction pipe 9 for supplying low-pressure gas is connected to the suction portion 1bK of the fixed scroll 1, and high-pressure gas discharged from the discharge port 1c of the fixed scroll 1 is communicated with the upper chamber of the fixed scroll 1. The liquid is discharged to the outside of the container 8 through the discharge pipe 10 .

According to this conventional scroll compressor, the swinging scroll 2 is eccentrically driven by the crankshaft 3 due to the rotation of the electric motor. As a result, the oscillating scroll 2 is moved in the longitudinal direction of the Oldham joint 7 by the guide groove 6e and the raised part 7b in the recess 6d of the how song 6, and by the guide groove 7a of the joint 7 and the protrusion N2d on the lower surface of the oscillating scroll. The oscillating movement is performed at a predetermined radius by the combined movement of the lateral movement of the oscillating scroll 2 with respect to the joint 7 due to the above movement. 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 compressed gas is discharged from the discharge port 1c.

FIGS. 8(a) to 8(d) illustrate the state in which the volume of the compression chamber decreases as the swinging motion of the swinging scroll 2 progresses,
Set the center point of fixed footed scroll l to 0. If the center point of the center side end of the swinging scroll 2 is P, the center 01ll end of the swinging scroll 2 swings and rotates with the 0 point as the center and OP as the radius. The center point Q of the outer end of the oscillating scroll 2 moves in parallel with the same radius as the point P, and the length of the radius OP is the eccentricity of the eccentric shaft 2C of the oscillating scroll 2 with respect to the crankshaft 3. be equivalent to. In FIG. 8(a), compression chambers 11a, 14b, llc, ], 1d are formed from the outside, but as the rocking motion progresses, each compression chamber (moves toward the center while decreasing its volume). In Figure 8, (
In the figure a), the angle of rocking rotation is 0°, and in the figure (b), the angle of rotation is 900°.
゜The view in (c) is 180°, and the view in (d) is 270°.
The case is shown below.

By the way, in the conventional device configured as shown in the paper, an Oldham joint is required to swing the swinging scroll 2, and this Oldham joint is formed in an annular shape, and the upper surface of the annular portion 7 The center line passing through the guide groove 7a formed in 7C and the center line passing through the protrusion 7b formed on the lower surface require a lot of machining time because it is necessary to maintain a surface angle with a high degree of lamination. The guide groove 6c in the housing 6 into which the protrusion 7b is inserted is a groove closed at both ends even though it is located within the four parts 6d, which also has the disadvantage of requiring a lot of machining time and increasing the cost. Ta. Furthermore, since the Oldham joint 7 itself makes left and right 18: backward movements, energy for this is wasted, leading to an increase in manpower loss.

[Summary of the invention]

The present invention has been made to improve the drawbacks of the conventional scroll press machine.
C, J: Aiming to shorten Ill during p-processing and reduce costs, we also sweep a scroll pressure four-barrel equipped with a swinging mechanism that reduces input loss by converting reciprocating interlocking into rotary motion. It is something.

[Embodiment 1 of the Invention] An embodiment of a scroll compressor 8' by G. Ming will be described.

9 and 10 show a scroll compressor 20 according to an embodiment of the present invention.

In FIGS. 9 and 10 showing this embodiment, the first
The same or corresponding parts as those of the conventional scroll compressor shown in the figures through FIG. 8 are given the same reference numerals, and the explanation thereof will be omitted.

In the scroll compressor of this embodiment, an eccentric shaft 21 is formed at the upper part of the crankshaft 3, and the eccentric shaft 21 has a center axis at a position offset by e with respect to the rotational axis of the crankshaft 3. It's 1.
An eccentric bearing 22 is formed on the lower surface of the lower plate 2b of the oscillating scroll 2 by an annular projecting wall so as to form an eccentric hole 22a into which an eccentric shaft 2 can be slidably inserted.

Hawthong 2 fixed to the outer lower surface of fixed scroll 1
3 is equipped with a relatively large recess 24 in the middle heat section of the upper surface,
Teeth are formed on the inner peripheral surface of the recess 24 to make the entire housing song 23 a fixed internal gear 25. On the other hand, teeth are formed on the outer circumferential surface of the eccentric bearing 22 at positions shifted downward from the tooth positions of the gear 25, so that the eccentric bearing 22 is also made into a gear 26 integrated with the oscillating scroll 2. There is.

An eccentric bearing 2 is attached to the support base 27 which is stretched out on the radial line connecting the rotation center axis of the crankshaft 3 and the center axis of the eccentric #+21 and on the opposite side of the eccentric shaft 21.
A gear 28 that meshes with the second gear 26 and a gear 29 that meshes with this gear 28 are arranged. and the outer m
A relatively large gear 30 that is coaxial with the gear 29 and meshes with a gear 25 formed on the inner circumferential surface of the how song 23 is disposed on one side of the gear 29. In addition, 23a
shows a lanoal bearing disposed between the outer periphery of the crankshaft 3 and the housing song 23.

According to the scroll compressor of this embodiment, when the crankshaft 3 rotates 1-1 in the counterclockwise direction as seen in FIG. 10, the movable scroll 2 also tries to rotate 1-1 in the same direction. As the support base 27 attached to the crankshaft 3 moves, the gear 30 moves to the gear 2 on the inner peripheral surface of the housing 23.
5 and rotate clockwise, and this rotation is transmitted to gear 28 via gear 29, which rotates counterclockwise.

As a result, the gear 26 meshing with the gear 28 is rotated clockwise, so that the counterclockwise rotational movement of the oscillating scroll 2 due to the rotation of the crankshaft 3 is canceled out, and the gear 26 is brought into a substantially stationary state. This results in only rocking movements in the front, back, left, and right directions.

To explain the pitch circles of the gears that cause such rotation cancellation of the oscillating scroll 2, a is the diameter of the pitch circle of the gear 26, a is the diameter of the pitch circle of the gear 28, and is the diameter of the pitch circle of the gear 29. If the diameter of the pitch circle of the C2 gear 30 is d, /% is the diameter of the pitch circle of the gear 25 provided on the mount 23, then f is the pitch circle of the gear 26 and the pitch circle of the gear 25. If the ratio of the circumference fπ is equal to the pitch circle ratio % of gear 29 and gear 30,
The X p yh Z y L point in FIG. 10 is always x'+ y'+ z'g t as the crankshaft 3 rotates.
' will be moved to the position corresponding to '. That is, if the amount of eccentricity of the eccentric shaft 21 with respect to the crankshaft 3 is e, the oscillating scroll 2 performs an oscillating motion with a radius e centered on the 0 point.

〔Effect of the invention〕

As explained above, according to the scroll compressor of the present invention, it is possible to generate the oscillating motion of the oil-driven scroll using only gears without using a single conventional Oldham coupling, etc., thereby reducing machining time. In addition, it is possible to reduce the cost associated with this, and it is possible to improve machine efficiency and reliability.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional scroll compressor, Figure 2 is a perspective view of a fixed scroll viewed diagonally from above, Figure 3 is a perspective view of a fixed scroll viewed diagonally from below, and Figure 4 is a conventional oscillating compressor. FIG. 5 is a perspective view of a conventional oscillating scroll seen diagonally from below; FIG. 6 is a perspective view showing a nozzle which is a component of a conventional scroll compressor; FIG. The figure is a perspective view showing a ring-shaped Oldham joint placed in the recess of the housing, and FIGS. 8(a), 8(b), 8(c) and 8(d) are FIG. 9 is a cross-sectional view showing a scroll compressor according to an embodiment of the present invention, and FIG. FIG. 3 is a schematic cross-sectional view particularly showing the positional relationship. 1... fixed scroll, la... spiral teeth, 2...
...Owing scroll, 2a...Spiral tooth, 3...
Crankshaft, 20...Scroll compressor, 21...
Eccentric shaft, 22... Eccentric bearing, 23... Housing,
24... Blank space, 25.26, 2, 18.2'J, 30
·gear. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masu Oiwa Figure 1 Figure 2 Figure 5 C Figure 3 Figure 6 Figure 8 (0) (d) Figure 9

Claims (1)

[Claims] A fixed scroll having plate-shaped teeth formed in a spiral shape and an oscillating scroll having teeth of the same shape as the teeth of the fixed scroll are fitted facing each other, and the oscillating movement of the oscillating scroll causes the fixed scroll to interact with the fixed scroll. An eccentric shaft formed at an upper end of a crankshaft in a scroll compressor that moves compressed gas to a center part while reducing the volume of a compression chamber formed between teeth of the oscillating scroll, and discharges compressed gas from the center part. an eccentric bearing that fits into the eccentric bearing; a gear constituted by teeth formed on the outer peripheral surface of the eccentric bearing; and a group of gears that rotate around the eccentric bearing together with the crankshaft and formed on the eccentric bearing. a first gear meshing with the gear;
A gear group consisting of a second gear that meshes with the second gear, and a third gear that is coaxial with the second gear, and a gear formed on a fixed part that is inscribed with the third gear so as to mesh with the third gear. and a scroll compressor.