JPH06299977A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent the shock caused by the contact between laps, fluctuation of the pressure in the compression chamber and the vibration of an closed container by providing a plurality of welding points to connect the outer circumference of a frame to the closed container on the upper outer circumference and the lower outer circumference respectively within the height of the outer circumference of the frame. CONSTITUTION:An outer circumferential part 24 of a frame is fitted facing to the inner side of an enclosed container 1, and a plurality of upper welding points 25 are the welding points to connect the frame 8 to the closed container 1, and are arranged on the upper side of the outer circumferential part 24 of the frame 8. The lower welding points 26 are arranged on the lower side of the outer circumferential part 24 of the frame 8, and the circumferential position of the closed container 1 is deviated from the upper welding points 25. Because the connection of the frame 8 to the closed container 1 is thus arranged in the upper and lower position, the rigidity of the closed container 1 at the part where the frame 8 is fitted is increased, and when the vibration or noise caused by the collision between laps or the pressure fluctuation of the compression chamber is propagated to the enclosed container 1, the distortional vibration of the closed container 1 can be reduced.

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.

7 and 8 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, and the frame 8 is fixed to the closed container 1 by welding points 19. The crankshaft 7 is supported by a frame 8 via bearings 9. The rotor of the motor 3 is attached to one side of the crankshaft 7, and the boss bearing 10 of the orbiting scroll 5 is fitted to the other side. The fixed scroll 4 is provided with a spiral wrap 12 standing upright on an end plate 11, and the suction chamber 1 is provided on the outer peripheral portion.
3 is formed, and the discharge port 14 is formed in the central portion. On the other hand, the orbiting scroll 5 includes an end plate 15 and a spiral wrap 16. Each lap 12 and 16
Has a 180 ° rotational symmetry, 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 line axis passing through the central portion, and the approach points are formed as compression chambers. Reference numeral 17-1 is an outer compression chamber and 17-2 is an inner compression chamber.

In the scroll compressor thus constructed, the rotor of the motor 3 causes the crankshaft 7 to rotate, and the orbiting scroll 5 orbits with respect to the fixed scroll 4 by the rotation preventing action of the Oldham ring 6. . Then, when the orbiting scroll 5 orbits, the approach point moves toward the central portion, and accordingly, the outer compression chamber 17-1 and the inner compression chamber 17-2 formed between the approach points move toward the central portion. The volume is gradually reduced. As a result, the low-pressure refrigerant gas sucked from the suction chamber 13 is compressed and the discharge port 14
Is discharged into the space inside the closed container 1 and then sent to the refrigeration cycle.

[0005]

In the conventional scroll compressor which operates in this way, in order to improve the sealing performance of the outer compression chamber 17-1 and the inner compression chamber 17-2 and to improve the performance, FIG. The gap d at the approach point shown in FIG. 10 is set to a small value. 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 d at the approach point.

Further, deviations from the central axis occur due to variations in fastening the fixed scroll 4 to the frame 8, which also acts in the direction of reducing the gap d at the approaching point. 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 fixed scroll 4
The wrap 16 of the orbiting scroll 5 collides with the wrap 12 of No. 1 and causes noise. In particular, when a contact is made at the position of the wrap end portion 18 of the fixed scroll 4 as shown in FIG. 8, the impact force is directly propagated to the frame 8 screw-fastened at the outer peripheral portion of the fixed scroll 4, and the frame 8 is It propagates to the closed container 1 which is fixed by welding. Therefore, there is a problem that noise is generated from the closed container 1.

Further, as shown in FIGS. 9 and 10, the wrap end portion 20 of the orbiting scroll 5 approaches the wrap 12 of the fixed scroll 4 with a gap d, and the wrap end portion 18 of the fixed scroll 4 is moved. Wrap 16 of orbiting scroll 5
On the other hand, when they are approaching each other with a gap d, the gas leaking from the inner compression chamber 17-2 to the outer compression chamber 17-1 rapidly increases the pressure of the outer compression chamber 17-1 and, at the same time, the gap d.
Since the leaked gas from the chamber is immediately released to the suction chamber 13, a pulsating flow is likely to occur. Therefore, a pressure fluctuation occurs in the outer compression chamber 17-1, which acts as an exciting force on the fixed scroll 4 and the orbiting scroll 5, and this also causes noise from the closed container 1 through the above-described propagation path. It was the cause.

For the purpose of solving the above problems, the present invention is intended to prevent impact due to contact between wraps, prevent pressure fluctuation in the compression chamber, and prevent vibration of the closed container 1.

An example of this kind of noise improvement is, for example, Japanese Patent Laid-Open No. 3-149386.

[0010]

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 hood having a bearing and an Oldham ring that prevents the orbiting scroll from rotating and makes an orbit around the crankshaft, in the vicinity of the wrap end of the fixed scroll and the wrap end of the orbiting scroll. The approach point clearance between the fixed scroll and the orbiting scroll ends at each end The wrap inner surface curve or the wrap outer surface curve of the orbiting scroll and the fixed scroll so as to gradually expand toward the outer side or the inner side of the reference curve is corrected to a wrap shape, and the welding point connecting the outer periphery of the hood and the closed container is the hood. By arranging a plurality of points on the upper outer periphery and a plurality of points on the lower outer periphery within the outer peripheral height, the rigidity of the closed container is enhanced.

[0011]

With this structure, the approach point clearance becomes large when the approach point comes near the lap end of the fixed scroll and the orbiting scroll, and therefore the lap between the laps, which is the first noise source, is increased. At the same time as the collision is prevented, the gas leaking from the inner compression chamber to the outer compression chamber easily leaks to the suction chamber, and the clearance is gradually reduced as the approach point moves toward the center of the spiral. The sudden pressure fluctuation in the outer compression chamber, which is Further, by providing the coupling between the fume and the closed container at the upper and lower outer peripheral positions of the fume, the strength of the connection between the closed container and the fume is increased and the rigidity of the closed container is increased, so that the deformation vibration of the closed container is less likely to occur. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of the lower surface of the fixed scroll, and FIG. 2 is a plan view of the upper surface of the orbiting scroll. FIG. 3 shows a part of a vertical section of the scroll compressor,
FIG. 4 shows a part of the side surface. The same parts as those in FIGS. 7 and 8 are denoted by the same reference numerals. In FIGS. 1 and 2, reference numeral 21 denotes a reference curve, which is an involute curve forming a wrap inner surface curve of the fixed scroll 4 and the orbiting scroll 5. Reference numeral 22 is a correction curve, and the wrap inner surface curve is corrected outward from the reference curve 21. δ represents a correction amount, which is the amount by which the correction curve 22 is moved and corrected with respect to the reference curve 21, and is gradually increased toward the wrap end 18 in the fixed scroll 4 and toward the lap end 20 in the orbiting scroll 5. There is.
23 is the correction start point, and is the start point of the correction curve 22 and δ
= 0. θ indicates a corrected section. In the combination of the fixed scroll 4 of FIG. 1 and the orbiting scroll 5 of FIG. 2, between the laps in the vicinity of the fixed scroll 4 wrap end portion 18 (section θ) and in the vicinity of the wrap end portion 20 of the orbiting scroll 5 (section θ). The approach point clearance is equal to the set clearance correction amount δ of each end portion 18,
It gradually increases toward 20.

In the scroll compressor having such a structure, when the lap approach point moves near the lap end portions (section θ) of the fixed scroll 4 and the orbiting scroll 5, the clearance at the lap end points becomes large at each lap end portion. As it moves toward the center of the spiral, it gradually shrinks, so that it is possible to prevent collision at the wrap end portion and rapid pressure fluctuation in the outer compression chamber 17-1.

Next, FIGS. 3 and 4 will be described. Reference numeral 24 denotes an outer peripheral portion of the hood, which is fitted to face the inner diameter of the closed container 1. Reference numeral 25 is an upper welding point, which is the frame 8 and the closed container 1.
A plurality of welding points that connect the
It is placed on the upper side of 4. Reference numeral 26 denotes a lower welding point, which is arranged below the outer peripheral portion 24 of the frame 8, and the circumferential position of the closed container 1 is displaced from the upper welding point 25.

In the scroll compressor having such a structure,
Since the connection between the frame 8 and the closed container 1 is arranged in the upper and lower two rows, the rigidity of the closed container 1 in the portion where the frame 8 is fitted is increased, and the collision between the laps and the pressure fluctuation of the compression chamber are caused. When vibration noise propagates to the closed container 1, the deformation vibration of the closed container 1 can be reduced. Therefore, when used together with the above-mentioned collision prevention between laps and pressure fluctuation prevention of the compression chamber, it is possible to significantly reduce noise.

FIG. 5 shows another embodiment of the present invention, in which the wrap inner surface curve is corrected by the correction curve 22 from the wrap end portion 18 of the fixed scroll 4 to the correction start point 23, and the orbiting scroll 5 wraps. The wrap outer surface of the fixed scroll 4 facing the vicinity of the terminal end portion 20 extends from the correction start point 23-1 to the correction end point 27 and the reference curve 21-1.
This is a correction curve 22-1 that is moved inward. The present embodiment has an advantage that only the fixed scroll 4 needs to be lap-corrected, and has the same effect as the above-mentioned embodiment.

FIG. 6 shows another embodiment of the present invention, in which the wrap inner surface curve is modified by the modification curve 22 from the wrap end portion 20 of the orbiting scroll 5 to the modification start point 23, and the wrap of the fixed scroll 4 is modified. The wrap outer surface of the orbiting scroll 5 facing the vicinity of the terminal end portion 18 is extended from the correction start point 23-2 to the correction end point 28 to the reference curve 21-2.
The correction curve 22-2 in the inner direction is moved and corrected. The present embodiment has an advantage that only the orbiting scroll 5 needs to be subjected to the lap correction process, and has the same effect as the above-mentioned embodiments.

[0018]

EFFECT OF THE INVENTION Fixed scroll 4 and orbiting scroll 5
When the lap approach point moves in the vicinity of the lap end portion, the approach point clearance is large, so that collision between the laps and pressure fluctuation in the compression chamber 17-1 can be prevented, and the frame 8 and the closed container 1 By increasing the coupling strength and increasing the rigidity of the closed casing 1, deformation vibration of the closed casing 1 can be prevented, so that a quiet scroll compressor can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a fixed scroll showing an embodiment of the present invention.

FIG. 2 is a plan view of an orbiting scroll showing an embodiment of the present invention.

FIG. 3 is a partial vertical cross-sectional view of a scroll compressor showing an embodiment of the present invention.

FIG. 4 is a side view of the scroll compressor according to the embodiment of the present invention.

FIG. 5 is a plan view of a fixed scroll showing another embodiment of the present invention.

FIG. 6 is a plan view of an orbiting scroll showing another embodiment of the present invention.

FIG. 7 is a vertical sectional view showing a conventional scroll compressor.

8 is a cross-sectional view taken along the line AA of FIG.

FIG. 9 is an enlarged view of a wrap end portion of an orbiting scroll in a conventional scroll compressor.

FIG. 10 is an enlarged view of a wrap end portion of a fixed scroll in 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 ...
Orbiting scroll end plate, 16 ... Orbiting scroll wrap,
17 ... compression chamber, 18 ... fixed scroll wrap end portion, 1
9 ... Welding point, 20 ... Orbiting scroll wrap end portion, 2
1, 21-1, 1, 2-2 ... Reference curve, 22, 22-1,
22-2 ... Modified curve, 23 ... Modified starting point, 24 ... Fum outer peripheral portion, 25 ... Upper welding point, 26 ... Lower welding point, 27, 2
8 ... end point of correction.

Claims (4)

[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 hood having a bearing and an Oldham ring that prevents the orbiting scroll from rotating and makes an orbit around the crankshaft, in the vicinity of the wrap end of the fixed scroll and the wrap end of the orbiting scroll. The approach point clearance between the fixed scroll and the orbiting scroll is directed toward each end. Wrap inner and outer curves of the orbiting scroll and fixed scroll so that they gradually expand so as to move outward or inward from the reference curve. A scroll compressor having a plurality of points on the upper outer circumference and a plurality of points on the lower outer circumference. 2. A wrap inner surface curve is corrected toward the lap end portion in the vicinity of the wrap end portion of the fixed scroll, and the wrap inner surface curve is moved toward the wrap end portion in an outward direction of the reference curve. 2. The correction is performed by sequentially moving toward the outer side of the reference curve toward each end portion, and the approach point clearances in the vicinity of the respective end portions are sequentially enlarged toward the end portion.
The scroll compressor described. 3. The wrap outer surface of the fixed scroll facing the vicinity of the wrap end portion of the orbiting scroll while correcting the wrap inner surface curve toward the lap end portion outwardly of the reference curve in the vicinity of the wrap end portion of the fixed scroll. It is characterized in that the curve is sequentially moved inward from the reference curve toward the wrap end direction of the orbiting scroll, and the approach point clearance in the vicinity of each end part is gradually expanded toward each end part. The scroll compressor according to claim 1. 4. A wrap outer surface of the orbiting scroll facing the vicinity of the wrap end portion of the fixed scroll while correcting the wrap inner surface curve toward the lap end portion outwardly of the reference curve in the vicinity of the wrap end portion of the orbiting scroll. It is characterized in that the curve is sequentially moved inward from the reference curve toward the wrap end direction of the fixed scroll, and the approach point clearance near each end part is gradually expanded toward each end part. The scroll compressor according to claim 1.