JPH06137281A - Scroll compressor - Google Patents

Abstract

PURPOSE:To provide a scroll compressor which is quiet by reducing the generation of noise resultant from collision of the stationary scroll lap of the scroll compressor with the revolving scroll lap thereof and the generation of resonance noise in a suction chamber at the outer peripheral part of the stationary scroll lap. CONSTITUTION:A cavity part 19 having depth equal to or longer than a lap height is formed in the back of the terminal part of the lap 12 of a stationary scroll. A resiliently deformable damping member 22 is inserted in a contacted state in the inner wall surface of the cavity part 19, and the cavity part 19 is formed in a manner to have muffling capacity. A so formed scroll compressor is designed to damp vibration generated owing to collision between laps and muffle resonance noise generated in a suction chamber and reduce the generation of noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly to a noise reduction structure for a scroll compressor.

[0002]

2. Description of the Related Art A scroll compressor is disclosed, for example, in Japanese Unexamined Patent Publication No.
As described in Japanese Patent No. 233181, a compression chamber in which a suction chamber is provided in the outer periphery of a compression space formed by two spiral shapes, a discharge port is provided in the center of the spiral, and a refrigerant gas is formed in the outer peripheral portion. From the center toward the compression chamber in the center, the compression action is performed.

FIGS. 4 and 5 show the structure of a conventional scroll compressor, in which a compressor element 2 is provided in a closed container 1.
And the motor 3 is housed. The compressor element 2 includes a fixed scroll 4, an orbiting scroll 5, an Oldham ring 6,
The crankshaft 7 and the frame 8 are mainly configured.
The crankshaft 7 is supported by a frame 8 via a bearing 9, and the rotor of the motor 3 is attached to one of the crankshaft 7,
The other end is fitted into the boss bearing 10 of the orbiting crawl 5. The fixed scroll 4 is provided with a spiral wrap 12 standing upright on an end plate 11, a suction chamber 13 is formed in the outer peripheral portion, and a discharge port 14 is formed in the central portion.

On the other hand, the orbiting scroll 5 is provided with an end plate 15 and a spiral wrap 16. The respective wraps 12 and 16 are in a 180 ° rotational symmetry relationship, and the spiral center of the fixed scroll 4 and the spiral center of the orbiting scroll 5 are engaged with each other with a deviation of the orbiting radius. As a result, each of the wraps 12 and 16 has a plurality of approach points on a straight axis passing through the center portion, and a compression chamber 17 is formed between the approach points.

In the scroll compressor thus constructed, the rotor of the motor 3 rotates the crankshaft 7, and the orbiting scroll 5 orbits with respect to the fixed scroll 4 by the rotation preventing action of the Oldham ring 6. . When the turning school turns, the approach point moves toward the central portion, and accordingly, the compression chamber 17 formed between the approach points gradually decreases in volume toward the central portion. As a result, the low-pressure refrigerant gas sucked from the suction chamber 13 is compressed, discharged from the discharge port 14 into the space inside the closed container 1, and further sent to the refrigeration cycle.

[0006]

In the conventional scroll compressor which operates in this manner, the gap between the approach points is set to a small value in order to improve the sealing performance of the compression chamber 17 and improve the performance. . On the other hand, the bearing 9 and the boss bearing 10 require a predetermined gap, and when receiving the centrifugal force and the gas force, the orbiting scroll 5 moves outward by the gap. This movement acts in the direction of reducing the gap between the approach points.

Further, deviations from the central axis occur due to variations in fastening the fixed scroll 4 to the frame 8, which also acts to reduce the gap between the approach points. Contact occurs at a position where the gap at the approaching point is 0 or less due to the above two actions. At this contact point, the wrap 16 of the orbiting scroll 5 collides with the wrap 12 of the fixed scroll 4, causing noise. In particular, as shown in FIG. 4, when contact is made at the position of the wrap end portion 18 of the fixed scroll 4, the outer peripheral portion of the wrap 12 of the fixed scroll 4 is integrated over approximately half the circumference, so that the impact force is fixed. It is easy to directly propagate to the frame 8 that is fastened at the outer peripheral portion thereof and further to the closed container 1 to which the frame 8 is fixed. Therefore, there is a problem that noise is generated from the closed container 1.

Further, the suction chamber 13 is provided in each wrap 1
Since 2 and 16 are formed over almost half of the outside meshed with each other, resonance is likely to occur in the space portion having the length L with both ends of the suction chamber 13 as reflecting surfaces, which also contributes to noise. .

The present invention aims to prevent the propagation of impact force from the fixed scroll 4 and the resonance noise in the suction chamber 13 for the purpose of solving the above problems.

An example of this kind of noise improvement is disclosed in Japanese Patent Laid-Open No. 149386/1989.

[0011]

In order to solve the above problems, spiral wraps of the same shape are combined at positions of rotational symmetry of 180 ° with each other, and the centers of the spirals are displaced by a turning radius and meshed with each other. The fixed scroll and the orbiting scroll that form the shaft are fitted to the boss bearings of the orbiting scroll with the turning radius eccentric, and the crankshaft having the motor rotor at the bottom is fastened to the fixed scroll and the above crankshaft is supported. In a scroll compressor having a frame having a bearing and an Oldham ring that prevents the orbiting scroll from rotating and makes an orbit around the crankshaft, a scroll height equal to or greater than a wrap height on the outer back portion near the wrap end portion of the fixed scroll. A cavity having a depth of 10 mm, and an elastically deformable damping member is provided inside the cavity. It is obtained by inserting in contact.

[0012]

With this structure, even if a collision occurs near the end of the wrap of the fixed scroll, the impact force is exerted on the outer periphery of the fixed scroll and the frame by the damping action of the cavity on the outer back of the wrap. Is prevented, and since the cavity portion is opened to the suction chamber of the fixed scroll, it has the effect of silencing the resonance in the suction chamber, so the noise of the scroll compressor can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a part of a vertical sectional view, and FIG. 2 is a plan view showing a lower surface of a fixed scroll. The same parts as those in FIGS. 4 and 5 of the conventional example are designated by the same reference numerals.

In FIGS. 1 and 2, 19 is a cavity, 20 is a throttle, and 21 is a volume chamber. A damping member 22 is inserted in contact with the inner wall of the cavity portion 19.

The cavity portion 19 has a depth equal to or higher than the height of the wrap 12, and the lap end portion 18 of the fixed scroll 4 is provided.
It is provided along the wrap 12 on the outer peripheral side.

Therefore, since the wrap end portion 18 and the outer peripheral portion of the fixed scroll 4 are not directly connected but only connected via the end plate 11, the impact generated at the wrap end portion 18 is
It becomes difficult to directly transmit from the outer peripheral portion of the fixed scroll 4 to the frame 8. Further, since the damping member 22 is formed to be slightly larger than the inner size of the volume chamber 21 and is inserted so as to contact the inner wall by elastically deforming the damping member 22 itself, the damping member 22 is lapped by the impact. Terminal part 18
Even if the vibration occurs, the vibration can be suppressed by the damping action of the damping member 22. In addition, the diaphragm portion 20 of the cavity portion 19 is
One end communicates with the suction chamber 13 of the fixed scroll 4 and the other end communicates with the volume chamber 21, and the cavity 19 is formed as a kind of resonance silencer. Therefore, the suction chamber 1 of the fixed scroll 4
By adjusting the resonance frequency generated within 3, it is possible to mute the resonance sound.

FIG. 3 shows another embodiment of the present invention, in which the length L'of the cavity 19 is λ / 4 with respect to the wavelength λ of the resonance frequency generated in the suction chamber 13. Is.

Therefore, L '= L / 2 is optimum for the first-order resonance occurring in the length L of the suction chamber 13 and L' = L / 4 is optimum for the second-order resonance.

This embodiment has the same effects as the above-mentioned embodiments and has the advantage that the cavity portion 19 can be easily processed.

[0020]

As described above, according to the present invention, the wrap end portion 18 is provided by providing the cavity portion 19 inscribed with the damping member 22 in the vicinity of the wrap end portion 18 of the fixed scroll 4.
It is possible to prevent the impact between the laps generated in the vicinity from being directly transmitted from the fixed scroll to the frame, and also to damp the wall vibration of the cavity portion 19. Further, the cavity portion 19 silences the resonance sound in the suction chamber 13. Therefore, it is possible to obtain a quiet scroll compressor.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a scroll compressor showing an embodiment of the present invention.

FIG. 2 is a plan view of a fixed scroll according to the present invention.

FIG. 3 is a plan view of a fixed scroll showing another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a scroll wrap portion in a conventional scroll compressor.

FIG. 5 is a vertical sectional view showing a conventional scroll compressor.

[Explanation of symbols]

1 ... airtight container, 2 ... compression element, 3 ... motor, 4 ... fixed scroll, 5 ... orbiting scroll, 6 ... Oldham ring,
7 ... Crankshaft, 8 ... Frame, 9 ... Bearing, 10 ... Boss bearing, 11 ... Fixed scroll end plate, 12 ... Fixed scroll wrap, 13 ... Suction chamber, 14 ... Discharge port, 15
... End plate of orbiting scroll, 16 ... Wrap of orbiting scroll, 17 ... Compression chamber, 18 ... Wrap end part, 19 ... Cavity part, 20 ... Throttle part, 21 ... Volume chamber, 22 ... Damping member.

Claims (3)

[Claims] 1. A compression chamber is formed by making the spiral wraps of the fixed side and the swivel side have the same shape, and combining them at positions of rotational symmetry of 180 °, and shifting the centers of the respective spirals by the swivel radius to engage with each other. The fixed scroll, the orbiting scroll, and the boss bearing of the orbiting scroll are eccentrically fitted by eccentricity, and the crankshaft having the motor rotor in the lower part is fastened to the fixed scroll at the outer peripheral portion and the above crankshaft is supported. In a scroll compressor having a frame having a bearing and an Oldham ring that prevents the orbiting scroll from rotating and makes an orbit around the crankshaft, a scroll height equal to or greater than a wrap height on the outer back portion near the wrap end portion of the fixed scroll. A cavity portion having a depth of is provided, and an elastically deformable damping member is brought into contact with the inner wall in the cavity portion. Scroll compressor, characterized in that inserted. 2. The hollow portion is composed of a throttle portion and a volume chamber, and the throttle portion communicates with the volume chamber and opens into a suction chamber formed in the outer peripheral portion of the wrap of the fixed scroll. 1. The scroll compressor according to 1. 3. The length L'of the hollow portion is L / L relative to the length L of the suction chamber formed in the outer peripheral portion of the wrap of the fixed scroll.
It is formed in 2 or L / 4.
The scroll compressor described.