JP2895323B2 - Scroll type fluid machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine used as a compressor or an expander.

[0002]

2. Description of the Related Art FIG. 4 is a longitudinal sectional view of a conventional scroll compressor, and FIG. 5 is a sectional view taken along line AA of FIG. In the figure,
The inside of the closed housing 8 is partitioned by a discharge cover 31 into a high-pressure side 44 and a low-pressure side 45. Inside the low pressure side 45 is a scroll type compression mechanism C
However, an electric motor M is provided at a lower portion, and these are interlocked and connected to each other via a rotating shaft 5. The electric motor M includes a rotor Ma and a stator Mb.
Is fixed to the rotating shaft 5, and the stator Mb is fixed to the sealed housing 8. The upper end of the rotating shaft 5 is supported by an upper bearing 71 provided on the frame 6, and the lower end is supported by a lower bearing 72.

The scroll type compression mechanism C has a fixed scroll 1 and an orbiting scroll 2. The fixed scroll 1 has an end plate 11 and a spiral wrap 12 erected on the inner surface thereof.
3 are provided.

The orbiting scroll 2 has an end plate 21 and a spiral wrap 22 erected on its inner surface.
Drive bush 5 is provided in boss 23 erected on the outer surface of
The eccentric pin 53 protruding from the upper end of the rotary shaft 5 is slidably fitted into a slide hole 55 formed in the drive bush 54 so as to be slidable.

The fixed scroll 1 and the orbiting scroll 2 are eccentric by a predetermined distance from each other, and are engaged with each other at an angle of 180 degrees, so that the side surfaces of the spiral wraps 12 and 22 are lined at several places. A plurality of closed spaces 24 are formed in contact with each other. The orbiting scroll 2 is slidably supported on a frame 6 fixed in a sealed housing 8, and allows the orbiting scroll 2 to revolve orbit between the orbiting scroll 2 and the frame 6, but prevents the orbiting scroll from rotating. A rotation prevention mechanism 3 including an Oldham link is provided.

A thin plate-like support spring 32 is disposed between a flange 14 formed on the outer periphery of the fixed scroll 1 and a leg 6b projecting from the upper end of the frame 6, and as shown in FIG. Both ends of the support spring 32 are fastened to the flange 14 by bolts 36, and the center portion is fastened to the legs 6 b by bolts 37. In this manner, the fixed scroll 1 is supported by the frame 6 so as to be levitated via the support spring 32, can move in a predetermined range in the vertical direction, and can move in a predetermined angle range with respect to the arrangement surface of the support spring 32. It can be tilted.

On the back surface of the end plate 11 of the fixed scroll 1, concentric cylindrical flanges 15, 16 centering on the center thereof are protruded upward, and between them, the lower surface of the discharge cover 31 faces downward. An intermediate pressure chamber 40 surrounded by these cylindrical flanges 38 protruding from them is hermetically slidably fitted.
The intermediate pressure chamber 40 communicates with the closed space 24 in the middle of gas compression through a pressure guiding hole 41 formed in the end plate 11. A high pressure chamber 42 is provided on the inner peripheral side of the intermediate pressure chamber 40.
Are formed, and a low-pressure chamber 43 is formed on the outer peripheral side.

In this compressor, the orbiting scroll 2 is driven by the orbiting mechanism including the rotary shaft 5, the eccentric pin 53, the drive bush 54, the boss 23 and the like by driving the electric motor M, and the orbiting scroll 2 is a rotation preventing mechanism. 3, while making a revolving motion, the revolving motion is performed on a circular orbit having a radius of revolution. Then
Gas enters the low pressure side 45 via the suction pipe 82 and passes through the passage 61.
Then, it is sucked into the closed space 24 from the low pressure chamber 43.
Then, the gas reaches the central portion while being compressed as the volume of the closed space 24 decreases due to the revolving orbiting motion of the orbiting scroll 2, and reaches the high pressure chamber 42 from the discharge port 13.
Through the discharge pipe 83, and is discharged to the outside.

At this time, a back pressure load based on the gas pressure in the high-pressure chamber 42 and the intermediate-pressure chamber 40 acts on the fixed scroll 1, and the fixed scroll 1 is pressed against the orbiting scroll 2, and the gas from the closed space 24 is removed. To prevent leakage. When the liquid is sucked into the closed space 24, the fixed scroll 1 floats via the support spring 32, and escapes the liquid to prevent the scroll-type compression mechanism C from being damaged. When the orbiting scroll 2 is inclined, the fixed scroll 1 is inclined via the support spring 32 so as to follow the inclined scroll 2, thereby preventing the orbiting scroll 2 and the fixed scroll 1 from hitting each other.

[0010]

In the conventional scroll type fluid machine, the support spring 32 is located between the bottom and the tip of the spiral wraps 12, 22, and the fixed scroll 1 is moved up and down. At the same time, it is inclined to follow the orbiting scroll 2.

However, in order to keep the intermediate pressure chamber 40 in a sealed state, the cylindrical flanges 15 and 16 protruding from the rear surface of the fixed scroll 1 and the cylindrical flange 38 protruding from the lower surface of the discharge cover 31 are provided. Is set as small as possible, and when the fixed scroll 1 is tilted to some extent via the support spring 32, the above-mentioned fitting portions come into contact with each other. That is, the cylindrical flange 15 or 16 is displaced and comes into contact with the cylindrical flange 38. For this reason, the inclination angle of the fixed scroll 1 is limited, so that the fixed scroll 1 cannot follow the inclination of the orbiting scroll 2, and there is a possibility that a one-sided contact may occur.

The present invention solves the above-mentioned disadvantages of the prior art,
It is intended to increase the tiltable angle of the fixed scroll so that the fixed scroll and the orbiting scroll do not come into contact with each other.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. A discharge cover is provided in a closed housing for partitioning the inside into a high pressure side and a low pressure side, and a fixed scroll and a swivel are provided on the low pressure side. The scroll and the scroll are housed in mesh with each other, the fixed scroll is attached to a frame fixedly installed in the sealed housing via a support spring, and a part of the back surface of the fixed scroll and a part of the inner surface of the discharge cover are fixed. Are formed in a sealed state to form an intermediate pressure chamber, and the fixed scroll is pressed toward the orbiting scroll by the fluid pressure during compression guided into the intermediate pressure chamber. The support spring is passed through a fitting portion between the fixed scroll and the discharge cover and is orthogonal to the axis of the fluid machine. Plane, or it relates to a scroll type fluid machine, characterized in that installed in the plane of its vicinity.

[0014]

According to the present invention, the following effects are produced because of the provision of the above configuration. That is, since the distance from the reference plane where the fixed scroll is inclined via the support spring to the fitting point between the rear surface of the fixed scroll and the inner surface of the discharge cover is reduced, the tiltable angle of the fixed scroll is increased. As a result, the fixed scroll can be inclined in accordance with the orbiting scroll, thereby preventing the two scrolls from hitting each other.

[0015]

FIG. 1 is a longitudinal sectional view of a main part of a scroll type compressor according to an embodiment of the present invention. In the drawing, 6b 'is a leg provided with its upper end protruding upward from the upper surface of the frame 6, and 14' is located on the outer periphery of the fixed scroll 1 whose upper surface is at the same height as the upper end of the leg 6b '. It is a formed flange. A thin plate-shaped support spring 32 is mounted between the leg 6b 'and the flange 14'. Both ends of the support spring 32 are fastened to the flange 14 ′ by bolts 36, and the center portion is fastened to the legs 6 b ′ by bolts 37. The fixed scroll 1 is supported by the frame 6 via the support spring 32 so as to float. I have. That is, the height position of the support spring 32 is determined by the cylindrical flanges 15 and 16 protruding from the rear surface of the fixed scroll 1 and the discharge cover 3.
1 is set in the same plane as the fitting position with the cylindrical flange 38 protruding from the lower surface or in a plane in the vicinity thereof,
The fixed scroll 1 can be inclined with respect to this plane. Portions other than those described above are the same as those of the prior art (FIGS. 4 and 5), and corresponding portions are denoted by the same reference numerals.

FIG. 2 is a view for explaining the principle of the above embodiment, and is a partial longitudinal sectional view of a fitting portion between the discharge cover 31 and the fixed scroll 1. As shown in FIG. In the figure, fixed scroll 1
The amount by which the cylindrical flanges 15 and 16 are displaced with the inclination of x is x, and the distance from the inclination reference plane (the arrangement surface of the support spring 32, not shown) at which the fixed scroll is inclined to the cylindrical flanges 15 and 16 Let y be the displacement amount x is proportional to the distance y. Therefore, the displacement amount x becomes smaller as the distance y from the inclination reference plane becomes smaller. If the displacement amount required for the cylindrical flange 15 or 16 to contact the cylindrical flange 38 is x ₀ , this displacement amount x ₀ The relationship between the tiltable angle θ of the fixed scroll 1 and the distance y is given in FIG.
And the smaller the distance y becomes, the larger the tiltable angle θ of the fixed scroll 1 becomes.

As described above, in this embodiment, the height of the support spring 32 is set in the same plane as the fitting position of the fixed scroll 1 and the discharge cover 31 or in a plane in the vicinity thereof and the distance y is set. Is reduced, the tiltable angle θ of the fixed scroll 1 can be increased,
The fixed scroll 1 can be inclined following the orbiting scroll 2.

[0018]

In the scroll type fluid machine of the present invention, the support spring is provided in a plane passing through the fitting portion between the fixed scroll and the discharge cover and orthogonal to the axis of the fluid machine, or in a plane in the vicinity thereof. Because it has
It is possible to increase the tiltable angle of the fixed scroll, and to avoid one-sided contact between the fixed scroll and the orbiting scroll.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a main part of a scroll compressor according to one embodiment of the present invention.

FIG. 2 is an explanatory view of the principle of the embodiment, and is a partial longitudinal sectional view of a fitting portion between a discharge cover and a fixed scroll.

FIG. 3 is a diagram illustrating a relationship between a distance from a tilt reference plane to a fitting position and a tiltable angle.

FIG. 4 is a longitudinal sectional view of a conventional scroll compressor.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed scroll 2 Orbiting scroll 6 Frame 6b, 6b 'Leg 8 Sealed housing 14, 14' Flange 15 Cylindrical flange 16 Cylindrical flange 31 Discharge cover 32 Support spring 36 Bolt 37 Bolt 38 Cylindrical flange 40 Intermediate pressure chamber 41 Pressure induction Hole 43 High pressure side 44 Low pressure side

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-237283 (JP, A) JP-A-4-36085 (JP, A) (58) Fields investigated (Int.Cl. ⁶ , DB name) F04C 18/02 311

Claims (1)

(57) [Claims] 1. A discharge cover for partitioning the interior into a high-pressure side and a low-pressure side in a closed housing, and a fixed scroll and an orbiting scroll are housed in the low-pressure side by meshing with each other, and fixedly installed in the closed housing. The fixed scroll is attached to the fixed frame via a support spring, and a part of the rear surface of the fixed scroll and a part of the inner surface of the discharge cover are fitted in a sealed state to form an intermediate pressure chamber. In a scroll type fluid machine in which the fixed scroll is pressed toward the orbiting scroll by the fluid pressure during compression guided into the intermediate pressure chamber, the support spring is fitted with the fixed scroll and the discharge cover. It is characterized in that it is installed in a plane passing through the place and orthogonal to the axis of this fluid machine, or in a plane near it. Scroll type fluid machinery.