JP2001123971A - Scroll-type fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll fluid machine capable of reducing vibration and noise caused by a change in rigidity. SOLUTION: In this scroll-type fluid machine, a fixed scroll and a turning scroll 2 are meshed with each other by a spiral fixed lap and a spiral turning lap to turn the turning scroll 2 without rotating, and gas is compressed. Cutout parts 23, 25 having diagonal sides are provided near the scroll starting point including the scroll contact starting point on the outermost peripheral part in either the fixed scroll or the turning scroll, and a cutout part is provided near the scroll end point including the scroll contact end point on the innermost peripheral part. The set rotation angle range θ1 in which the relief part or the cutout part on the outermost peripheral part is provided and the set rotation angle range θ2 in which the relief part or the cutout part on the innermost peripheral part is provided are set so as to be partially overlapped.

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, and more particularly, to the reduction of noise and the like caused by a change in rigidity due to meshing, as well as a shock at discontinuous meshing during scroll meshing. The present invention relates to a scroll type fluid machine that can be operated.

[0002]

2. Description of the Related Art Scroll type fluid machines are increasingly used as compressors for air conditioning and refrigeration because they can operate with high efficiency and low noise. In general, this type of scroll compressor is a type in which a pair of scrolls each composed of an end plate and a spiral wrap erected on its inner surface are meshed with each other. As shown in FIG. 19, a fixed scroll 12 having a constant height and thickness and formed in an involute curve is integrally provided on an end plate 11 of the fixed scroll 1. As shown in FIG. 20, a spiral orbiting wrap 22 having a constant height and thickness and formed in an involute curve is integrally provided on the end plate 21 of the orbiting scroll 2. The two scrolls 1 and 2 mesh with the two wraps 12 and 22 facing each other.

FIGS. 15 to 18 are explanatory views of the compression action of the fixed scroll 1 and the orbiting scroll 2 meshed as described above, as viewed from the orbiting scroll 2 side. In FIG. 15, the turning wrap 22 is different from the fixed wrap 12 in FIG.
It turns in the order of → FIG. 16 → FIG. 17 → FIG. 18 → FIG. In the figure, 3a, 3b, 3c, 3d, 4a, 4b,
Reference numerals 4c and 4d denote closed spaces. The closed spaces are designed to perform compression work by gradually reducing the volume while moving from a suction port (not shown) to a discharge port 5 provided at the center as a compression chamber.

[0004]

In the conventional scroll-type fluid machine, when the orbiting scroll 2 advances from the state shown in FIG. 18 to the state shown in FIG. The inside (inside) end point of the involute and the back side (outside) of the fixed wrap 12 abut. When this contact point is referred to as a suction cutoff point S1, the two wraps 12, 22 are brought into pressure contact with each other at the suction cutoff point S1, the inflow of the suction refrigerant gas is cut off, and the compression chamber 3a is formed. Side involute end point and turning lap 2
The back side of No. 2 abuts and the contact point is also the suction cutoff point S2,
Similarly, a compression chamber 4a is formed. Thereafter, FIG. 15 → FIG.
The turning motion of the turning wrap 22 proceeds in the order of → FIG. 17 → FIG. 18 → FIG. 15, but the two contact points do not separate during that time, and the compression chambers 3 and 4 gradually increase in volume while maintaining the contact state. And moves to the center while compressing the refrigerant gas.

However, as described above, both wraps 1
There are discontinuous points in the meshing of the wraps 2 and 22, such as the meshing start point (the suction cutoff point that occurs first). At these discontinuous points, the rigidity of both laps 12 and 22 suddenly changes. However, since the contact force between the two wraps 12 and 22 changes suddenly and discontinuously, there is a problem that noise and vibration increase. Further, if the engagement start point is displaced to the contact side due to a machining error at the time of machining, there is a problem that the contact is sharp and shocking vibration and noise are generated.

In order to solve this problem, FIGS.
As shown in FIG. 5, notches 13 and 2 having oblique sides in the wrap near the contact start point of the outermost peripheral portion of the fixed wrap 12 and the turning wrap 22 and the contact end point of the innermost peripheral portion (not shown).
3 is provided to improve the above problem (for example, see Japanese Patent Application Laid-Open No. Hei 9-12598).

FIG. 23 shows the notch 13,
23 is not provided (FIGS. 19 and 20), FIG.
Are provided with notches 13 and 23 (FIGS. 21 and 22).
FIG. 7 is a graph showing a change in rigidity in the case of FIG. Here, in each graph, when the orbiting scroll 2 rotates, the position of the contact point between the orbiting wrap 22 and the fixed wrap 12 changes (moves inward) according to the rotation angle (horizontal axis). This shows a state in which the rigidity (vertical axis) at the contact point changes. The reason for the change in the rigidity is that the change in the rigidity, that is, the change in the contact rigidity that affects the acting force between the fixed scroll 1 and the orbiting scroll 2 greatly affects the behavior, noise, and vibration of the scroll. It is. Specifically, if the change in rigidity (including the magnitude of the head) is large, noise and vibration increase.

When one lap is in contact with the other lap at a rotation angle θ as shown in FIG. 26, as shown in FIG. ΔX occurs. The contact point of the lap contacted at the outermost peripheral portion gradually moves inward, and as shown in FIG. 27, the smaller the radius of curvature of the wrap, the smaller the displacement amount ΔX and the greater the rigidity. As shown in the figure, the line of the graph is inclined obliquely upward. When the contact point is released at, for example, point B in FIG. 26, the line changes with a drop due to a sharp decrease in rigidity as shown in FIG.

When the first contact point makes one rotation and reaches one inside (one cycle of FIGS. 15 to 18 is completed), a new contact point returns to the outermost position. Therefore, there are a plurality of contact points on both laps, and as a result, a graph in which a plurality of lines indicating the contact points overlap as shown in the lower half of FIG. 23 (single lap rigidity). Therefore, the change in rigidity that greatly affects the behavior, noise, and vibration of the scroll,
The sum of the changes in stiffness at a plurality of contact points (shown as the total wrap stiffness in the upper half of the graph) is a major factor that determines the scroll characteristics.

Here, as described above, the notch 13,
23 is not provided, the graph showing the total lap rigidity of FIG. 23 rises sharply at the portion A and drops sharply at the portion B, but shows the total lap rigidity of FIG. The graph is slightly smoother in both the A section and the B section, and is improved as far as it is. However, it is possible to avoid a sudden contact that is increased due to a processing error or the like by the above-described measures, but as described above, vibration,
There is a problem that it is not possible to improve a state where the rigidity change is disadvantageous in terms of noise.

On the other hand, as disclosed in Japanese Patent Application Laid-Open No. Hei 8-61268, the number of effective contact turns of the fixed scroll 1 and the orbiting scroll 2 is set to an integral multiple. With such a configuration, the rigidity change at the contact start point and the contact end point is offset as shown in FIG. 25, and the rigidity change twice per rotation shown in FIG. 23 and FIG. As shown in FIG. 25, one stiffness change per rotation is made one stiffness change to reduce the amount of change. However, at a high rotation speed, even if the stiffness change is made once in one rotation, the stiffness change with a large drop is a noise. There is a problem that causes the occurrence of the above. Therefore, the present invention provides a scroll-type fluid machine that can reduce vibration and noise due to a change in rigidity.

[0012]

In order to solve the above-mentioned problems, according to the present invention, a spiral wrap (for example, an end plate) is provided on each end plate (for example, the end plates 11 and 21 in the embodiment). Wrap 12, swivel wrap 2 in form
The fixed scroll (for example, the fixed scroll 1 in the embodiment) provided with 2) and the orbiting scroll (for example, the orbiting scroll 2 in the embodiment) mesh with each other, and the orbiting scroll does not rotate with respect to the fixed scroll. In a scroll type fluid machine that compresses gas by orbiting, a wrap inner surface curve is formed around at least one of the fixed scroll and the orbiting scroll near a scroll start point including a scroll contact start point on the outermost periphery. An escape portion (e.g., the wrap 24 in the embodiment) or a cutout portion having an oblique side (e.g., the cutout portions 13 and 23 in the embodiment) that smoothly escapes outward from the reference curve is provided, and the innermost peripheral portion is scrolled. Near the scroll end point including the contact end point, the wrap inner surface curve is used as the reference curve A relief portion (e.g., the wrap 24 in the embodiment) or a notch portion having an oblique side (e.g., the notch portions 15 and 25 in the embodiment) is provided on the outer side, and the relief portion on the outermost peripheral portion is provided. The rotation angle range in which the cutout portion is provided (for example, the set rotation angle range θ1 in the embodiment), and the rotation angle range in which the relief portion or the cutout portion in the innermost peripheral portion is provided (for example, the setting in the embodiment) The rotation angle range θ2) is partially overlapped. With such a configuration, in the overlapping portion of the rotation angle range in which the relief portion or the notch portion of the outermost peripheral portion is provided and the rotation angle range in which the relief portion or the notch portion of the innermost peripheral portion is provided. Increase in rigidity near the scroll contact start point,
It is possible to partially offset the decrease in rigidity near the scroll contact end point.

According to a second aspect of the present invention, a fixed scroll having a spiral wrap provided on each end plate and a orbiting scroll are engaged with each other so that the orbiting scroll does not rotate with respect to the fixed scroll. In the scroll type fluid machine that compresses gas by orbiting motion, at least one of the fixed scroll and the orbiting scroll, near the scroll start point including the scroll contact start point on the outermost peripheral portion, the wrap inner surface curve is used as a reference. Provide a relief portion or a notch portion having an oblique side to smoothly escape outward from the curve, and smoothly escape the wrap inner surface curve outward from the reference curve near the scroll end point including the scroll contact end point on the innermost peripheral portion. A relief portion or a notch portion having oblique sides is provided, and the relief portion or the notch portion on the outermost peripheral portion is provided. A rotation angle range which is characterized by a rotation angle range of the relief portion or notch portion of the innermost portion is provided matches. With such a configuration, the rotation angle range in which the relief portion or the notch portion of the outermost peripheral portion is provided and the rotation angle range in which the relief portion or the notch portion of the innermost peripheral portion is provided match. Thus, the increase in rigidity near the scroll contact start point and the decrease in rigidity near the scroll contact end point can be completely canceled.

According to a third aspect of the present invention, a fixed scroll having a spiral wrap provided on each end plate and a orbiting scroll are engaged with each other so that the orbiting scroll does not rotate with respect to the fixed scroll. In the scroll type fluid machine that compresses gas by orbiting motion, at least one of the fixed scroll and the orbiting scroll, near the scroll start point including the scroll contact start point on the outermost peripheral portion, the wrap inner surface curve is used as a reference. Provide a relief portion or a notch portion having an oblique side to smoothly escape outward from the curve, and smoothly escape the wrap inner surface curve outward from the reference curve near the scroll end point including the scroll contact end point on the innermost peripheral portion. A relief portion or a notch portion having oblique sides is provided, and the relief portion or the notch portion on the outermost peripheral portion is provided. Than the rotation angle range which is characterized in that the rotation angle range of the relief portion or notch in the innermost peripheral portion is provided is set larger. With this configuration, it is possible to secure a large rotation angle range at the innermost peripheral portion where the radius of curvature is smaller and the rigidity is higher than the outermost peripheral portion, and it is possible to moderate the decrease in rigidity at the innermost peripheral portion. Becomes

According to a fourth aspect of the present invention, a fixed scroll having a spiral wrap provided on each end plate and a orbiting scroll are engaged with each other so that the orbiting scroll does not rotate with respect to the fixed scroll. In the scroll type fluid machine that compresses gas by orbiting motion, at least one of the fixed scroll and the orbiting scroll, near the scroll start point including the scroll contact start point on the outermost peripheral portion, the wrap inner surface curve is used as a reference. Provide a relief portion or a notch portion having an oblique side to smoothly escape outward from the curve, and smoothly escape the wrap inner surface curve outward from the reference curve near the scroll end point including the scroll contact end point on the innermost peripheral portion. A relief portion or a notch portion having oblique sides is provided, and the relief portion or the notch portion on the outermost peripheral portion is provided. A rotation angle range which is characterized in that the rotation angle range of the relief portion or notch portion of the innermost portion is provided are both set to an integer wound minutes. With this configuration, the start point and the end point of the stiffness increasing portion and the stiffness decreasing portion are matched, the occurrence of a peak portion that occurs when the two portions overlap with each other is suppressed as much as possible, and the sum of the stiffness is smoothed. It becomes possible.

According to a fifth aspect of the present invention, the rotation angle range where the relief portion or the notch portion of the outermost or innermost portion is not provided (for example, the set rotation angle range θ3 in the embodiment) is an integer. It is characterized by being set to the number of turns. With this configuration, the start point and the end point of the rigidity increasing portion and the rigidity decreasing portion are made to coincide with each other, and the start point and the end point of the portion where the relief portion or the notch portion is not provided are also made coincident. In addition, it is possible to minimize the occurrence of a peak portion generated when the start point and the end point overlap each other, and to promote smoothing of the total rigidity.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are perspective views showing the basic structure of a fixed scroll 1 and a revolving scroll 2 according to a first embodiment of the present invention. As shown in FIG. 1, a fixed wrap 12 is erected on an end plate 11 of the fixed scroll 1, and has a diagonal side in a wrap curve near a contact start point at an outermost peripheral portion and near a contact end point at an innermost peripheral portion. Notches 13, 15
Is provided.

On the other hand, as shown in FIG.
A turning wrap 22 is provided upright on the end plate 21, and cutout portions 23 and 25 having oblique sides are provided on the wrap curves near the contact start point on the outermost peripheral portion and the contact end point on the innermost peripheral portion. I have. The notches 13 and 15 and the notch 2
As described later by taking the orbiting scroll 2 as an example, the reference numerals 3 and 25 are formed over a fixed set rotation angle range. FIGS. 1 and 2 illustrate a state in which the formation range is minimized in order to make the shape of the cutout portion easy to understand.

FIGS. 3 and 4 show details of cutouts provided in the fixed scroll 1 and the orbiting scroll 2. FIG. As shown in FIG. 3, a portion from the abdominal involute end point of the fixed wrap 12 to the site X is formed by a cutout portion 13 having oblique sides. As shown in FIG. 4, a portion between the end point of the abdominal involute of the turning wrap 22 and the portion Y is also formed by a cutout portion 23 having oblique sides. Here, the notch 1 having the above-mentioned oblique side
Instead of 3 and 23, as shown in FIG. 5, a curved wrap 24 cut out so as to smoothly escape from an involute curve (a reference curve which is an inner peripheral surface before processing) may be used (the following implementation). In the form). Although FIG. 5 has described the orbiting scroll 2, the same applies to the fixed scroll 1. The curved wrap 24 that smoothly escapes from the involute curve to the outside from the portion Y ′ to the end point of the abdominal involute may be used.

The cutout portions 13, 15 and the cutout portions 23, 25 are set within the range described with reference to FIG. 6 using the orbiting scroll 2 as an example (the same applies to the following embodiments). That is, the set rotation angle range θ1 of the notch 23 (13) provided on the lap curve near the contact start point on the outermost periphery and the notch 25 provided on the wrap curve near the contact end point on the innermost periphery. (15) Set rotation angle range θ
2 is partially set. In each of the above ranges, the oblique side of the notch 23 (13) is gradually inclined. Also, the notch 23,
In setting 13 (similarly for the wrap 24), it goes without saying that it is formed to a depth that does not affect the efficiency.

Therefore, in this embodiment, the notches 13, 15, 23, 25 are basically provided, so that the change of the total wrap rigidity due to the meshing of the two laps and the release of the meshing is smoothed. Since the contact surfaces do not suddenly come into contact with each other and do not separate from the tooth surface, the contact force between the wraps can be smoothly changed, and noise and vibration caused by a change in the tooth surface rigidity at each contact portion can be prevented. In addition, since the installation range of the cutouts 23 and 25 (13 and 15) or the curved wrap 24 is set as described above, noise and vibration can be further reduced. That is,
Compared to the case where the above-described overlapping portion is not set as indicated by the broken line in FIG. 7, the portion where the rigidity increases due to the setting of the overlapping portion (for example, a portion) and the portion where the rigidity decreases (for example, a portion) For example, part of part b) cancels out, and the peak of the total change in rigidity can be reduced as shown by the solid line in the figure.

FIGS. 8 and 9 are explanatory diagrams corresponding to FIGS. 6 and 7 of the second embodiment of the present invention. This embodiment is provided with a notch or a curved wrap as in the previous embodiment, but differs in the installation range. The orbiting scroll 2 shown in FIG.
25 is provided as an example, the installation range will be described. The set rotation angle range θ1 of the notch 23 (13) provided on the lap curve near the contact start point of the outermost periphery and the innermost periphery Notch 2 provided on the lap curve near the contact end point
The setting rotation angle range θ2 of 5 (15) is set to completely match.

Therefore, also in this embodiment, the notches 13, 15, 23 and 25 are basically provided, so that the change of the total wrap rigidity due to the engagement of the two laps and the release of the engagement can be made smooth. Since the contact does not suddenly come off or the tooth surface does not separate, the contact force between the wraps can be changed smoothly, and noise and vibration caused by a change in the tooth surface rigidity can be prevented. Also, the notches 23, 25 (1
3, 15) or the installation range of the curved wrap 24 is set as described above, so that noise and vibration can be further reduced. That is, as shown by the broken line in FIG. 9, the rigidity increasing portion (for example, c portion) near the contact start point of the outermost peripheral portion and the rigidity decreasing portion (for example, near the contact end point of the innermost peripheral portion) (for example, d)) is completely canceled out,
The sum of the changes in rigidity in this portion is further smoothed as compared with the case where the sum of the rigidity changes partially overlaps as shown by the broken line.

FIGS. 10 and 11 are explanatory views corresponding to FIGS. 6 and 7 of the third embodiment of the present invention. This embodiment also has a cutout or a curved wrap, as in the previous embodiments. In this embodiment, the following relationship is set in the cutout portion or the installation range of the curved wrap. This is specifically described in the orbiting scroll 2 shown in FIG.
The case where 3 and 25 are provided will be described as an example. The notch 23 provided on the lap curve near the contact start point on the outermost periphery is described.
The cutout portion 25 (1) provided on the lap curve near the contact end point of the innermost periphery than the set rotation angle range θ1 of (13).
The set rotation angle range θ2 of 5) is set large.

Therefore, also in this embodiment, the notches 13, 15, 23 and 25 are basically provided, so that the change of the total wrap rigidity due to the meshing of the two laps and the release of the meshing can be made smooth. Since the contact does not suddenly come off or the tooth surface does not separate, the contact force between the wraps can be changed smoothly, and noise and vibration caused by a change in the tooth surface rigidity can be prevented. Further, the rigidity is large near the contact end point of the innermost peripheral portion because the curvature radius of the wrap is smaller than that near the contact start point of the outermost peripheral portion, and the degree of decrease in the rigidity when the tooth surface is separated (inclination). Notch 23 provided on the lap curve near the contact start point of the outermost peripheral portion
The cutout portion 25 (1) provided on the lap curve near the contact end point of the innermost periphery than the set rotation angle range θ1 of (13).
Since the set rotation angle range θ2 of 5) is set to be large, the decrease in rigidity at the innermost peripheral portion can be made more gentle. As a result, the process of lowering the rigidity in the vicinity of the contact end point of the innermost peripheral portion can be moderated, so that the rigidity can be smoothed.

As specifically shown in FIG. 11, a notch 23 provided on the lap curve near the contact start point on the outermost periphery.
The set rotation angle range θ1 of (13) and the set rotation angle range θ2 of the notch 25 (15) provided on the lap curve near the contact end point of the innermost peripheral portion are set to be the same. , Noise and vibration can be reduced. That is, FIG.
As shown by the broken line in FIG. 1, the inclination of the stiffness-reduced portion (e.g., e) near the contact end point of the innermost peripheral portion becomes gentler compared to the case where no countermeasure is taken. This can contribute to the smoothing of the sum of changes.

FIGS. 12 and 13 are explanatory views corresponding to FIGS. 6 and 7 of the fourth embodiment of the present invention. This embodiment has a cutout portion or a curved wrap similarly to the previous embodiment, but has a feature in its installation range. The above-described installation range will be described by taking as an example a case where a notch is provided in the orbiting scroll 2 in FIG. 12. The notch 23 provided on the lap curve near the contact start point on the outermost periphery is described.
The set rotation angle range θ1 of (13) and the set rotation angle range θ2 of the notch portion 25 (15) provided on the lap curve near the contact end point of the innermost peripheral portion are both equal to the integral number of turns (360).
° × N), in this embodiment, one rotation is set.
In other words, the start point and the end point near the contact end point of the outermost peripheral portion, which is the portion where the rigidity is increased, coincide with each other, and the start point and the end point near the contact start point of the innermost peripheral portion that is the reduced rigidity portion Coincide with each other, and the occurrence of a peak portion that occurs when the start point and the end point overlap each other is suppressed as much as possible.

Therefore, also in this embodiment, the notches 13, 15, 23, 25 are basically provided, so that the change of the total wrap rigidity due to the engagement of the two laps and the release of the engagement can be made smooth. Since the contact does not suddenly come off or the tooth surface does not separate, the contact force between the wraps can be changed smoothly, and noise and vibration caused by a change in the tooth surface rigidity can be prevented. Also, the notches 23, 25 (1
3, 15) or the installation range of the curved wrap 24 is set as described above, so that noise and vibration can be further reduced. That is, as shown in FIG. 13, when looking at a point f (end point) where the rigidity is highest near the contact start point at the outermost peripheral portion, the rigidity reaches one peak at this point f, Since the point g (start point) in the vicinity of the next outermost peripheral contact start point, which should be added to the point f, has a stiffness of zero, at least in these two relations, the sum at this part, And peak points can be minimized. That is, the point g is f
Since the point coincides with the point, the total sum at the point h and the peak at the point i can be suppressed as compared with the case where the point f is before the point g.

Similarly, in the vicinity of the contact end point on the innermost peripheral portion, the point j where the rigidity is the highest (separation start point)
, The rigidity reaches one peak at this j point, but it should be added to this j point. Since the separation end point) has a stiffness of 0, at least in these two relations, the sum and the peak point at this portion can be minimized. That is, since the j point coincides with the k point, the sum at the 1 point and the peak at the m point can be suppressed as compared with the case where the k point is before the j point. Therefore, as shown in FIG. 13, the sum of the rigidity changes is further smoothed.

Further, in addition to the above-described fourth embodiment, if the set rotation angle range θ3 of the portion where the notch portion or the curved wrap is not provided is set to an integral number of turns, here, one turn ( (Not shown), the rigidity increase near the contact start point of the outermost peripheral part, the rigidity decrease near the contact end point of the innermost peripheral part, and the rigidity increase in the meshing at the part where the notch or the like is not provided are completely reduced. Since they are offset, the total sum of the changes in rigidity as a whole can be smoothed as shown in FIG.
The present invention is not limited to the above embodiment,
For example, it may be applied only to one of the orbiting scroll and the fixed scroll.

[0031]

As described above, according to the first aspect of the present invention, the rotation angle range in which the relief portion or the notch portion of the outermost peripheral portion is provided, and the relief portion of the innermost peripheral portion, In the overlapping portion with the rotation angle range in which the notch portion is provided, the increase in the rigidity near the scroll contact start point and the decrease in the rigidity near the scroll contact end point can be partially offset. There is an effect that the total wrap stiffness in the overlapping portion of the rotation angle range is suppressed, and noise and vibration can be reduced.

According to the second aspect of the present invention, the rotation angle range in which the relief portion or the notch portion of the outermost peripheral portion is provided, and the rotation angle range in which the relief portion or the notch portion of the innermost peripheral portion is provided. And the decrease in the stiffness in the vicinity of the scroll contact end point can be completely offset by the increase in the stiffness in the vicinity of the scroll contact end point. Therefore, there is an effect that noise and vibration can be reduced.

According to the third aspect of the present invention, a large rotation angle range is secured in the innermost peripheral portion where the radius of curvature is smaller and the rigidity is higher than the outermost peripheral portion, and the rigidity in the innermost peripheral portion is reduced. Since the stiffness can be reduced, smoothing of the total sum of rigidity can be promoted, and thus, there is an effect that vibration and noise can be reduced.

According to the fourth aspect of the present invention, the starting point and the ending point of the stiffness increasing portion and the stiffness decreasing portion are made coincident with each other to minimize the occurrence of a peak portion which occurs when both portions overlap each other. Since smoothing of the sum can be advanced, there is an effect that vibration and noise can be reduced.

According to the fifth aspect of the present invention, the starting point and the ending point of the stiffness increasing portion and the stiffness decreasing portion are made to coincide with each other, and the starting point and the starting point of the portion where the relief portion or the notch portion is not provided. Match the end points,
Since it is possible to minimize the occurrence of a peak portion generated when the start point and the end point overlap with each other and to promote the smoothing of the total rigidity, the rigidity increasing portion and the rigidity decreasing portion overlap. In such a case, the sum of rigidity is smoothed, and there is an effect that vibration and noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a fixed scroll according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the orbiting scroll according to the first embodiment of the present invention.

FIG. 3 is an enlarged view of a main part of FIG. 1;

FIG. 4 is an enlarged view of a main part of FIG. 2;

FIG. 5 is a perspective view of a wrap that can be used in place of the notch.

FIG. 6 is a plan view of the orbiting scroll according to the first embodiment of the present invention.

FIG. 7 is a graph showing a change in rigidity according to the first embodiment of the present invention.

FIG. 8 is a plan view of an orbiting scroll according to a second embodiment of the present invention.

FIG. 9 is a graph showing a change in rigidity according to the second embodiment of the present invention.

FIG. 10 is a plan view of an orbiting scroll according to a third embodiment of the present invention.

FIG. 11 is a graph showing a change in rigidity according to a third embodiment of the present invention.

FIG. 12 is a plan view of an orbiting scroll according to a fourth embodiment of the present invention.

FIG. 13 is a graph showing a change in rigidity according to a fourth embodiment of the present invention.

FIG. 14 is a graph showing another aspect of the fourth embodiment of the present invention.

FIG. 15 is an explanatory diagram showing a compression action by a fixed scroll and an orbiting scroll.

FIG. 16 is an explanatory diagram showing a compression action by a fixed scroll and an orbiting scroll.

FIG. 17 is an explanatory diagram showing the compression action by the fixed scroll and the orbiting scroll.

FIG. 18 is an explanatory diagram showing a compression action by a fixed scroll and an orbiting scroll.

FIG. 19 is a perspective view of a conventional fixed scroll.

FIG. 20 is a perspective view of a conventional orbiting scroll.

FIG. 21 is a perspective view of another conventional fixed scroll.

FIG. 22 is a perspective view of another prior art orbiting scroll.

FIG. 23 is a graph showing a change in rigidity corresponding to FIGS. 19 and 20;

FIG. 24 is a graph showing a change in rigidity corresponding to FIGS. 21 and 22.

FIG. 25 is a graph showing a change in rigidity of still another conventional technique.

FIG. 26 is a partially enlarged perspective view of a wrap.

FIG. 27 is a sectional view of a part A in FIG. 26;

FIG. 28 is a graph showing a change in rigidity from part A to part B in FIG. 26;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed scroll 2 Orbiting scroll 11, 21 End plate 12 Fixed lap 13, 15, 23, 25 Notch portion 22 Orbiting wrap 24 Wrap (relief portion) S1, S2 Suction cutoff point θ1, θ2, θ3 Set rotation angle range (rotation) Angular range)

Claims (5)

[Claims] 1. A fixed scroll having a spiral wrap provided on each end plate and a orbiting scroll are meshed with each other, and the orbiting scroll is rotated so as not to rotate with respect to the fixed scroll. In the scroll-type fluid machine that compresses, at least one of the fixed scroll and the orbiting scroll, the wrap inner surface curve smoothly escapes outward from the reference curve near a scroll start point including a scroll contact start point at the outermost peripheral portion. A relief portion or a cutout portion having an oblique side is provided, and a relief portion or an oblique side that smoothly escapes the wrap inner surface curve outward from the reference curve is provided near a scroll end point including a scroll contact end point of the innermost peripheral portion. To provide a notch having
The rotation angle range in which the relief portion or the notch portion of the outermost peripheral portion is provided and the rotation angle range in which the relief portion or the notch portion of the innermost peripheral portion is provided are set to partially overlap. A scroll type fluid machine characterized by the above-mentioned. 2. A fixed scroll having a spiral wrap standing upright on each end plate and a orbiting scroll are engaged with each other, and the orbiting scroll is rotated so as not to rotate with respect to the fixed scroll. In the scroll-type fluid machine that compresses, at least one of the fixed scroll and the orbiting scroll, the wrap inner surface curve smoothly escapes outward from the reference curve near a scroll start point including a scroll contact start point at the outermost peripheral portion. A relief portion or a cutout portion having an oblique side is provided, and a relief portion or an oblique side that smoothly escapes the wrap inner surface curve outward from the reference curve is provided near a scroll end point including a scroll contact end point of the innermost peripheral portion. To provide a notch having
The rotation angle range in which the relief portion or notch portion of the outermost peripheral portion is provided matches the rotation angle range in which the relief portion or notch portion of the innermost peripheral portion is provided. Scroll type fluid machine. 3. A fixed scroll having a spiral wrap provided on each end plate and an orbiting scroll are meshed with each other, and the orbiting scroll is rotated so as not to rotate with respect to the fixed scroll. In the scroll-type fluid machine that compresses, at least one of the fixed scroll and the orbiting scroll, the wrap inner surface curve smoothly escapes outward from the reference curve near a scroll start point including a scroll contact start point at the outermost peripheral portion. A relief portion or a cutout portion having an oblique side is provided, and a relief portion or an oblique side that smoothly escapes the wrap inner surface curve outward from the reference curve is provided near a scroll end point including a scroll contact end point of the innermost peripheral portion. To provide a notch having
The rotation angle range in which the relief portion or the notch is provided in the innermost portion is set to be larger than the rotation angle range in which the relief portion or the notch in the outermost portion is provided. Scroll type fluid machinery. 4. A fixed scroll having a spiral wrap provided on each end plate and a orbiting scroll are meshed with each other, and the orbiting scroll is rotated so as not to rotate with respect to the fixed scroll. In the scroll-type fluid machine that compresses, at least one of the fixed scroll and the orbiting scroll, the wrap inner surface curve smoothly escapes outward from the reference curve near a scroll start point including a scroll contact start point at the outermost peripheral portion. A relief portion or a cutout portion having an oblique side is provided, and a relief portion or an oblique side that smoothly escapes the wrap inner surface curve outward from the reference curve is provided near a scroll end point including a scroll contact end point of the innermost peripheral portion. To provide a notch having
The rotation angle range in which the relief portion or notch portion of the outermost peripheral portion is provided and the rotation angle range in which the relief portion or notch portion of the innermost peripheral portion is provided are both set to an integral number of turns. A scroll type fluid machine characterized by the above-mentioned. 5. The rotation angle range in which the relief portion or the notch portion of the outermost or innermost portion is not provided is set to an integral number of turns.
3. The scroll type fluid machine according to item 1.