JPH029972A - Sealed scroll compressor - Google Patents

Abstract

PURPOSE:To improve the sliding between a rotary scroll and a thrust receiver made of cast iron by arranging a reinforcing steel plate at the back of the end plate of the rotary scroll and arranging the thrust receiver supporting the thrust force of the rotary scroll on a frame. CONSTITUTION:When a rotary scroll 4 made of aluminum alloy and arranged on the frame 2 of a compressor 1 is driven via a shaft 8, a compression space formed between it and a fixed scroll 3 is compressed, a compressed fluid is fed by pressure to a discharge port 6 from the intake port 5 of the fixed scroll 3. A thrust plate 9 made of a circular steel plate is arranged on the back of the end plate of the rotary scroll 4 in this constitution. An Oldham's ring 10 and a thrust receiver 13 made of cast iron are arranged between the frame 2 and the rotary scroll 4. The abrasion of the rotary scroll 4 against the thrust receiver 13 due to the thrust force at the time of compression is suppressed by the thrust plate 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a hermetic scroll compressor, and particularly to improvement of the sliding surfaces of end plates of a thrust receiver and an orbiting scroll.

(Prior Art) -i. A closed scroll pressure machine is provided with a fixed scroll and an orbiting scroll meshing with each other on a frame, and the orbiting scroll is driven by a shaft. In addition, an Oldham ring and a thrust receiver are provided between the frame and the orbiting scroll, and while regulating the rotation of the orbiting scroll, the orbiting scroll is caused to revolve while maintaining a certain eccentric distance with respect to the fixed scroll, and also acts on the orbiting scroll. Support thrust force.

(Problem to be Solved by the Invention) However, in conventional hermetic scroll compressors, the scroll member is usually manufactured by automatically cutting an aluminum alloy block material, so the orbiting scroll does not move during compression. The thrust force acting on the steel is large, and aluminum alloys have the disadvantage of lacking strength against wear.

Therefore, surface hardness can be increased by surface treatment of the sliding surfaces of the thrust receiver and the orbiting scroll, but this has disadvantages of increased cost and reduced smoothness of the finished surface.

Therefore, the present invention has been made to solve the above problems, and is a low-cost hermetic scroll compressor that increases the hardness of the sliding surface between the thrust receiver and the orbiting scroll, has high smoothness, and has excellent sliding properties. I will provide a.

[Structure 1 of the Invention (Means for Solving the Problems) In order to achieve the above object, the present invention provides a frame with:
In the scroll expansion pressure W4 machine, which is provided by meshing an aluminum alloy fixed scroll and an orbiting scroll,
A reinforcing steel plate is provided on the back surface of the end plate of the orbiting scroll, and a cast iron thrust receiver is provided on the frame to support the thrust force of the orbiting scroll.

(Function) With the above configuration, the reinforcing steel plate provided on the back side of the end plate of the orbiting scroll has high hardness and excellent wear resistance, so wear of the orbiting scroll against the thrust receiver due to thrust force during compression is suppressed. .

(Example) A preferred embodiment of the present invention will be described based on the accompanying drawings.

As shown in FIG. 1, the closed scroll compression tR1 is
A fixed scroll 3 made of aluminum alloy and an orbiting scroll 4 are provided on the frame 2 in mesh with each other, and the fixed scroll 3 is provided with a suction port 5 and a discharge port 6. A muffler 7 is provided. On the other hand, the orbiting scroll 4 is driven by a shaft 8, and an orbiting scroll thrust plate 9 is provided on the back side of the end plate of the orbiting scroll 4, and is fixed with bolts. As shown in FIG. 2, the orbiting scroll thrust plate 9 is formed of a circular steel plate [carbon tool #5 class (SK5)], and has a notch 11 cut out at a position corresponding to the corner of the Oldham ring 10. At the same time, two fixing holes 12 are symmetrically provided outside the pivot outer diameter of the Oldham ring 10.

Further, an Oldham ring 10 and a thrust receiver 13 made of cast iron are provided between the frame 2 and the orbiting scroll 4.

Next, the operation of the embodiment will be described.

The fixed scroll 3 and the orbiting scroll 4 are meshed to form a crescent-shaped compression space, and the orbiting scroll 4 is rotated to contract the compression space toward the center of the spiral while compressed fluid is discharged from the discharge port 6 in the center. Discharge. Also,
By providing the Oldham ring 10, the rotation of the orbiting scroll 4 is regulated and the orbiting scroll 4 is allowed to revolve with a constant eccentric distance relative to the fixed scroll 3. moreover,
The thrust receiver 13 supports the thrust force acting on the orbiting scroll 4 and slides on the orbiting scroll thrust plate.

Therefore, since the orbiting scroll thrust plate 9 provided on the back side of the end plate of the orbiting scroll 4 has high hardness and excellent wear resistance, the thrust plate 9 due to the thrust force during compression
Abrasion of the orbiting scroll 4 to the bridge 13 is suppressed.

Therefore, the hardness of the back surface of the end plate of the orbiting scroll 4 can be easily increased, and there is no need to increase the surface hardness by surface treatment of the sliding surface of the orbiting scroll with the thrust receiver 13, resulting in low cost and the ability to finish the surface by surface treatment. It is possible to prevent a decrease in the smoothness of the surface.

Further, the sliding surface of the orbiting scroll 4 with the thrust receiver 13 has increased hardness and smoothness compared to the base material, so that the sliding surface has excellent sliding performance. Therefore, the input for compression R1 can be reduced and reliability can be improved.

In addition, although the above embodiment describes the case where two fixing holes for fixing to the end plate of the orbiting scroll are symmetrically provided in the orbiting scroll thrust plate, it is possible to provide three or more fixing holes. Also good. Further, as shown in FIG. 3, a notch 14 for an oil reservoir may be provided on the sliding surface of the orbiting scroll thrust plate 9 of the above embodiment against the thrust receiver 13.

[Effects of the Invention] Since the present invention is constructed as described above, it exhibits the following effects.

(1) The hardness of the sliding surfaces between the thrust receiver and the orbiting scroll can be increased to improve wear resistance as much as possible.

(2) Surface treatment of the orbiting scroll is not required, reducing the cost and preventing deterioration in the smoothness of the finished surface due to the surface treatment of the orbiting scroll.

(3) Since the sliding properties between the thrust receiver and the steel plate are excellent, input to the scroll compressor can be reduced and reliability is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
FIG. 3 is a diagram showing a modification of the orbiting scroll thrust plate. In the figure, 1 is a scroll compressor, 2 is a frame, 3 is a fixed scroll, 4 is an orbiting scroll, 9 is a steel plate, and 13 is a thrust receiver. Patent applicant: Toshiba Corporation

Claims (1)

[Claims] 1. In a scroll compressor in which a fixed scroll made of aluminum alloy and an orbiting scroll are installed on a frame in mesh with each other, a reinforcing steel plate is provided on the back of the end plate of the orbiting scroll, and a thrust of the orbiting scroll is installed on the frame. A hermetic scroll compressor characterized by a cast iron thrust receiver that supports the force.