JPH03233101A - Scroll type fluid machine - Google Patents

Abstract

PURPOSE:To prevent tilting of a rotary scroll by rotatably fitting a pin projected from the end face of the center part of a spiral lap of the rotary scroll in an eccentric hole of a support bush. CONSTITUTION:A rotary scroll 1 is meshed with a rotary scroll 2, respectively having spiral laps 12, 22 stood on end plates 11, 21. The rotary scroll 2 is driven by a rotary driving mechanism interlockingly connected to its end plate 21 and revolution motion is caused. A pin 30 is projected from the end face of a center part of the lap 22 of the rotary scroll 2, and rotatably fitted in an eccentric hole 32 of a rotatably supported support bush 31. When the rotary scroll 2 is under a revolution motion, the pin 30 is rotated around the axial center thereof and in the eccentric hole 32, and the support bush 31 is rotated around the center shaft thereof. Tilting of the rotary scroll is thus prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a scroll-type fluid machine used as a compressor, an expander, a pump, or a motor.

(Prior Art) FIG. 3 shows an example of a conventional scroll compressor.

As shown in FIG. 3, inside the sealed housing 8, there is a scroll type compression mechanism C in the upper part, and an electric motor M in the lower part.
is installed.

The scroll compressor IIC is connected to a fixed scroll 1, an orbiting scroll 2, a rotation prevention member 3 such as an Oldham ring that allows the orbiting scroll 2 to revolve but prevents their rotation, the fixed scroll 1, and an electric motor M. It consists of a frame 6, an upper bearing 71 and a lower bearing 72 that pivotally support the rotating shaft 5, an orbiting bearing 73 that supports the orbiting scroll 2, a thrust bearing 74, and the like.

The fixed scroll 1 includes an end plate 11 and a spiral wrap 12 erected on its inner surface, and the end plate 11 is provided with a discharge port 13 and a discharge valve 17 for opening and closing the port.

The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21. A drive bush 25 is mounted on the orbiting bearing 7 in a boss 23 erected on the outer surface of the end plate 21.
3, and an eccentric pin 53 protruding from the upper end of the rotary sawmill 5 is rotatably fitted into an eccentric hole formed in the drive bush 25.

A plurality of sealed spaces 24 are formed point-symmetrically by making the fixed scroll 1 and the orbiting scroll 2 eccentric from each other by the orbital radius and meshing them with each other at an angle of 180@.

By driving the electric motor M, the rotating shaft 5
, the orbiting scroll 2 is driven via the eccentric pin 53, the drive bush 25, and the post 23, and the orbiting scroll 21
While being prevented from rotating by the rotation prevention mechanism 3, it revolves around a circular orbit having a revolution radius.

Then, the refrigerant gas passes through the suction pipe 82 and enters the sealed housing 8.
After entering the interior and cooling the electric motor M, it passes through a passage 85 bored in the frame 6 and is sucked into the sealed space 24 through a suction passage 15 provided in the fixed scroll 1 and a suction chamber 16 . Then, as the volume of the closed space 24 decreases due to the revolving movement of the orbiting scroll 2, it reaches the central part while being compressed, pushes open the discharge valve 17 from the discharge port 13, enters the discharge cavity 14, and further discharges. tube 8
3 and is discharged to the outside.

At the same time, lubricating oil 8 is stored in the inner bottom of the housing 8.
1 is sucked up by a pump 51 provided at the lower part of the rotary shaft 5, passes through the oil supply hole 52, and is delivered to the lower bearing 72,
After lubricating the eccentric pin 53, the upper bearing 71, the rotation prevention member 3, the swing bearing 73, the thrust bearing 74, etc., the oil is discharged through the chamber 61 and the oil drain hole 62, and is stored at the bottom of the sealed housing 8.

Note that 84 is a balance weight attached to the upper end of the rotating shaft 5.

(Problem to be solved by the invention) In this type of scroll type fluid machine, during its operation,
The pressure of the fluid in the sealed space 24 acts on the side surface of the spiral wrap 22 of the orbiting scroll 2 and the upper surface of the end plate 21, and due to this pressure, the orbiting scroll 2 receives a tilting moment that tilts its axis of rotation. .

The direction of this tilting moment is determined by the orbiting scroll 2.
It rotates sequentially with the revolution and rotation of the planet.

However, in the above-mentioned conventional scroll type fluid machine, the orbiting scroll 2 is only operatively connected to the orbiting drive mechanism at its lower part, and the upper part of the orbiting scroll 2, that is, the tip side of the spiral wrap 22 is not connected at all. Since it is not supported, when the tilting moment acting on the orbiting scroll 2 increases, the orbiting scroll 2 tilts and the mesh gap, that is, the spiral ramp 22 of the orbiting scroll 2 increases.
Since the gap between the side surface of the spiral wrap 12 of the fixed scroll 1 and the side surface of the spiral wrap 12 of the fixed scroll l increases, the fluid in the sealed space 24 leaks from this gap, reducing the volumetric efficiency of the scroll-type fluid machine and deteriorating its performance.

Furthermore, at the same time, there was a problem in that the eccentric pin 53 for driving the orbiting scroll 2 came into partial contact, causing abnormal wear.

(Means for Solving the Problems) The present invention was invented in order to solve the above problems, and its gist is that a fixed scroll is formed by erecting spiral wraps on each end plate. In a scroll-type fluid machine in which the orbiting scroll and the orbiting scroll are meshed with each other and the orbiting scroll is driven by an orbit drive mechanism interlockingly connected to the end plate of the orbiting scroll to perform a revolving orbital movement, the center of the spiral wrap of the orbiting scroll is This scroll type fluid machine is characterized in that a pin is provided protruding from the distal end surface of the part, and the pin is rotatably fitted into an eccentric hole of a rotatably supported support bush.

(Function) Since the present invention has the above configuration, when the orbiting scroll revolves, the pin protruding from the tip surface of the spiral wrap of the orbiting scroll rotates around its axis within the eccentric hole of the support bushing. The support bushing rotates around its central axis.

(Example) One embodiment of the invention is shown in FIGS. 1 and 2.

A pin 30 is provided protruding from the center end surface of the spiral wrap 22 of the orbiting scroll 2, and this pin 30 is connected to the support foot 3.
It is rotatably fitted into an eccentric hole 32 bored in the lower surface of 1. The support bush 31 is fitted into a recess 33 formed in the end plate 11 of the fixed scroll 1, and supported by a needle hair ring 34 so as to be rotatable about its axis.

The eccentric hole 32 is formed eccentrically by a predetermined distance from the central axis of the support bush 31, that is, by an amount equal to the eccentricity between the eccentric pin 53 and the rotary shaft 5.

A discharge boat 3 is installed in the center of the end plate 21 of the orbiting scroll 2.
4 is bored, and this discharge boat 34 is opened and closed by a discharge valve 35. The discharge valve 35 is housed in a discharge chamber 36 formed inside the boss 23, and one end thereof is fastened to the end plate 21 with a bolt 37. The discharge chamber 36 communicates with the chamber 61 via a through hole 43 formed in the post 23.

The rest of the structure is the same as the conventional one shown in FIG. 3, and corresponding members are given the same reference numerals.

When the orbiting scroll 2 revolves, the pin 30 rotates around its axis within the eccentric hole 32, and the bush 31 rotates around its central axis. At the same time, gas is sucked into the closed space 24 via the suction pipe 38 and the suction chamber 16, and as the closed space 24 moves toward the center while reducing its volume, it is compressed and reaches the center, and the discharge boat 34 is The oil enters the discharge chamber 36 by pushing open the discharge valve 35, enters the internal space of the sealed housing 8 through the through hole 43, chamber 61, and oil drain hole 62, and is discharged to the outside through a discharge pipe (not shown).

(Effects of the Invention) In the present invention, a pin is provided protruding from the center end surface of the spiral wrap of the orbiting scroll, and this pin is rotatably fitted into an eccentric hole of a rotatably supported support bush. Therefore, one end of the orbiting shaft of the orbiting shaft is supported by the orbiting drive mechanism, and the other end is supported by the support bushing so that the orbiting scroll can revolve around each other, so that tilting of the orbiting scroll can be prevented, and the mesh gap can be reduced. It is possible to prevent an increase in the rotational speed and also to prevent abnormal wear of the swing drive mechanism.

[Brief explanation of drawings]

1 and 2 show one embodiment of the invention, with FIG. 1 being a partial longitudinal sectional view and FIG. 2 being a perspective view of the pin and support bush. FIG. 3 is a longitudinal sectional view showing an example of a conventional scroll type fluid machine. Fixed scroll-1, end plate-11, wrap-12, orbiting scroll-2, end plate-21, wrap-22, pin 1
Figure procedure amendment written form) September 1998 Interest date 2゜3゜4゜1990 Patent Application No. 28845 Name of the invention Relationship with the scroll type fluid machine amendment case Patent applicant address Chiyoda, Tokyo Ward Marunouchi 2-5-1 Name (6
20) Mitsubishi Heavy Industries, Ltd.

Claims (1)

[Claims] A fixed scroll and an orbiting scroll each having a spiral wrap erected on an end plate are meshed with each other, and the orbiting scroll is driven by an orbit drive mechanism interlocked with the end plate, thereby causing a revolution movement. In a scroll-type fluid machine, a pin is provided protruding from the center end surface of the spiral wrap of the orbiting scroll, and this pin is rotatably fitted into an eccentric hole of a rotatably supported support bush. A scroll-type fluid machine with special features.