JP6726782B2 - Scroll for compressor and scroll compressor - Google Patents

Description

The present invention relates to a method and an apparatus for manufacturing a scroll for a compressor.

Generally, a scroll compressor has a fixed scroll in which a spiral wall is erected on one side surface of an end plate, and a spiral wall body having substantially the same shape as the wall of the fixed scroll on one side surface of the end plate. And an orbiting scroll that is erected. Then, one side surface of each of the end plates of the fixed scroll and the orbiting scroll is made to face each other, and the wall bodies are arranged in combination. In this state, the orbiting scroll orbits the orbiting scroll with respect to the fixed scroll to gradually reduce the volume of the compression chamber formed between the wall bodies and compress the fluid in the compression chamber.

Regarding a scroll used in such a compressor, conventionally, for example, in a method for manufacturing a scroll compressor described in Patent Document 1, a side opposite to an end plate (end plate) of at least one of fixed and swivel scrolls ( It is shown that a large number of minute depressions for retaining lubricating oil are provided on the surface of the lapping side) by jetting a liquid containing hard particles.

On the other hand, conventionally, for example, in the residual stress improving method for a metal material described in Patent Document 2, in order to prevent stress corrosion cracking from occurring in a welded portion of the metal material or in the vicinity thereof, water jet ejection causes cavitation phenomenon to occur. It has been shown that, by causing a liquid flow containing cavitation bubbles to collide with the surface of a metal material, a compressive residual stress is generated in the metal material by the impact force generated by the collapse of the cavitation bubbles.

JP, 2009-74540, A Japanese Patent No. 3162104

In a scroll of a compressor, stress concentration occurs at the corner of the connecting portion between the end plate and the wall during operation, and cracks due to fatigue easily occur. Therefore, it is desirable to apply the residual stress on the compression side to the above-mentioned desired locations where cracking due to fatigue is remarkable, and measure the improvement in fatigue strength. As a means for applying the residual stress, there is peening or the like. However, in ordinary shot peening or the like, a steel ball for peening does not hit the desired portion, so that it is not suitable for a scroll. Further, as compared with shot peening, the cavitation bubbles due to the water jet are more likely to reach a narrow place such as the desired place than the shot peening, and thus are suitable for scroll application than shot peening.

However, even though the cavitation bubbles due to the water jet are facing, the scroll has a shape in which the wall body is erected on the end plate, and is not a plate shape like the test piece shown in Patent Document 2, so There is a problem that it is difficult to cause cavitation bubbles to collide with a desired portion and it is difficult to generate a compressive residual stress at the desired portion.

The present invention is to solve the above problems, a method of manufacturing a scroll for a compressor capable of appropriately colliding cavitation bubbles at a desired position of the scroll, a manufacturing apparatus, and a scroll for a compressor in which cracks are prevented. And a scroll compressor.

In order to achieve the above-mentioned object, a method for manufacturing a compressor scroll of the present invention includes a first scroll in which a spiral-shaped first wall body is provided on one side surface of a first end plate, and a second end plate. A spiral second wall body is provided on one side surface, and the second wall body is rotatably supported while being prevented from rotating in a state in which the second wall body is engaged with the first wall body of the first scroll. Two scrolls, and a step portion in which the height of each of the one side surfaces of each of the end plates is increased on the center side of the vortex along each of the wall bodies and lowered on the outer end side, and each of the wall bodies. A method of manufacturing a scroll for a compressor, wherein a stepped portion is formed in which the height is lowered on the central portion side of the vortex and increased on the outer terminal side to engage with the step portions of each scroll. At, a cavitation bubble formed by jetting a water jet is jetted toward the one side surface of the end plate in the scroll, and the center of the cavitation bubble is the spiral center of the wall body in the end plate. A water jet peening step of arranging the stepped portion and the stepped portion on an outer peripheral portion of the cavitation bubble in a state of being separated from the cavitation bubble.

According to this method for manufacturing a scroll for a compressor, the stepped portion and the stepped portion are located in the outer peripheral portion of the range of the cavitation bubble in a state where the center of the cavitation bubble is separated from the spiral center of the wall body in the end plate. Then, the center position of the cavitation bubble becomes a straight line position to the corner where the wall is joined near the step and the stepped portion in the spiral passage by the wall, and the flow of the liquid flow containing the cavitation bubble Is not obstructed by the wall, it is possible to make cavitation bubbles collide with the corners. That is, the cavitation bubbles can be made to collide with a desired portion of the scroll as appropriate, a compressive residual stress can be generated at the desired portion, and the generation of cracks can be prevented.

Further, in the method for manufacturing a compressor scroll of the present invention, the water jet peening step includes the positions of the cavitation bubbles and the scroll, and a virtual line that connects the step portion and the stepped portion with a straight line is formed. It is characterized in that the cavitation bubbles and the scroll are moved relative to each other so as to intersect with each other.

According to this method for manufacturing a scroll for a compressor, it is possible to cause cavitation bubbles to appropriately collide with a desired portion (corner) of the scroll, generate a compressive residual stress at the desired portion, and prevent the occurrence of cracks. it can.

Further, in the compressor scroll manufacturing method of the present invention, the water jet peening step, at the position of the cavitation bubble and the scroll, to stop the relative movement of the cavitation bubble and the scroll for a predetermined time. Characterize.

According to the method for manufacturing a scroll for a compressor, cavitation bubbles can be sufficiently collided with a desired portion (corner) of the scroll, a compressive residual stress is generated at the desired portion, and a crack is prevented from occurring. You can

Further, in the method for manufacturing a compressor scroll of the present invention, the water jet peening step is performed before the surface treatment is performed on the scroll.

According to this method of manufacturing a scroll for a compressor, a water jet peening step is performed before the surface treatment of the scroll, which assists the generation of compressive residual stress due to the collision of cavitation bubbles and prevents the generation of cracks. It is possible to obtain a remarkable effect.

Further, the method for manufacturing a scroll for a compressor of the present invention is characterized in that a cleaning liquid is mixed into the water for generating the cavitation bubbles.

According to the method for manufacturing a scroll for a compressor, the scroll can be cleaned with the cleaning liquid at the same time as the water jet peening step.

In order to achieve the above-described object, the compressor scroll manufacturing apparatus of the present invention includes a first scroll in which a spiral first wall is provided on one side surface of a first end plate, and a second end plate. A spiral second wall body is provided on one side surface, and the second wall body is rotatably supported while being prevented from rotating in a state in which the second wall body is engaged with the first wall body of the first scroll. Two scrolls, and a step portion in which the height of each of the one side surfaces of each of the end plates is increased on the center side of the vortex along each of the wall bodies and lowered on the outer end side, and each of the wall bodies. A compressor scroll manufacturing apparatus in which a height is reduced on the center side of a vortex and increased on the outer end side to form stepped portions that engage with each other's step portions in each scroll. And a positioning means for positioning and arranging the scroll in the container, and a water jet ejecting means having a nozzle for ejecting a water jet toward the scroll, which is disposed in water in the container. , The cavitation bubbles generated in the water of the container by the water jet of the water jet injection means, toward the one side surface of the scroll positioned by the positioning means, the center of the cavitation bubbles The stepped portion and the stepped portion are positioned on the outer peripheral portion of the cavitation bubble in a state of being separated from the spiral center of the wall body of the end plate.

According to this compressor scroll manufacturing apparatus, the water jet peening step in the above-described compressor scroll manufacturing method can be performed.

Further, in the compressor scroll manufacturing apparatus of the present invention, the positioning means includes a fixing mechanism that engages with the end plate of the scroll to fix the scroll.

According to this scroll manufacturing device for a compressor, by fixing the scroll by the fixing mechanism, the cavitation bubble is held when the cavitation bubble collides with the scroll, and the cavitation bubble appropriately collides with a desired portion (corner). Therefore, a compressive residual stress is generated at the desired portion, and the generation of cracks can be prevented.

Further, in the compressor scroll manufacturing apparatus of the present invention, the position determining means includes the positions of the cavitation bubbles and the scroll, and intersects a virtual line that connects the step portion and the stepped portion with a straight line. As described above, a moving mechanism for moving the scroll is provided.

According to this compressor scroll manufacturing apparatus, it is possible to appropriately cause cavitation bubbles to collide with a desired portion (corner) of the scroll, generate a compressive residual stress at the desired portion, and prevent occurrence of cracks. it can.

Further, in the compressor scroll manufacturing apparatus of the present invention, the moving mechanism includes a plurality of the fixing mechanisms to move a plurality of the scrolls.

According to this compressor scroll manufacturing apparatus, it is possible to sequentially cause cavitation bubbles to collide with desired portions (corners) of a plurality of scrolls in an appropriate manner. As a result, the water jet peening step in the method for manufacturing a compressor scroll described above can be efficiently performed.

Further, in the compressor scroll manufacturing apparatus of the present invention, the water jet spraying means includes a swirling mechanism that swivels the nozzle so that the cavitation bubbles swirl with respect to the scroll.

According to this scroll manufacturing device for a compressor, cavitation bubbles directly collide with a desired portion (corner) which is an inner corner portion of the end plate and the wall body. Can be collided.

In order to achieve the above-mentioned object, the compressor scroll of the present invention is characterized by being produced by using the above-described compressor scroll manufacturing apparatus.

According to this compressor scroll, the occurrence of cracks can be prevented, and the occurrence of failures due to the cracks can be reduced.

In order to achieve the above-mentioned object, the scroll compressor of the present invention is characterized in that the above-mentioned compressor scroll is applied.

According to this scroll compressor, the occurrence of cracks in the scroll can be prevented, and the occurrence of failures due to the cracks can be reduced.

According to the present invention, cavitation bubbles can be appropriately made to collide with a desired portion of the scroll.

FIG. 1 is a sectional view showing an example of a scroll compressor according to an embodiment of the present invention. FIG. 2 is a perspective view of the fixed scroll and the orbiting scroll according to the embodiment of the present invention. FIG. 3 is a front view of the fixed scroll according to the embodiment of the present invention. FIG. 4 is a front view of the orbiting scroll according to the embodiment of the present invention. FIG. 5 is a schematic view showing a method for manufacturing a compressor scroll according to the embodiment of the present invention. FIG. 6 is a schematic side view showing a compressor scroll manufacturing apparatus according to an embodiment of the present invention.

Embodiments according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to this embodiment. In addition, constituent elements in the following embodiments include elements that can be easily replaced by those skilled in the art, or substantially the same elements.

FIG. 1 is a cross-sectional view showing an example of a scroll compressor according to this embodiment, FIG. 2 is a perspective view of a fixed scroll and an orbiting scroll according to this embodiment, and FIG. 3 is a front view of the fixed scroll according to this embodiment. 4 and 5 are front views of the orbiting scroll according to the present embodiment.

The scroll compressor 10 shown in FIG. 1 is mainly used for compressing a refrigerant of a vehicle air conditioner. In the scroll compressor 10, a scroll compression mechanism including a fixed scroll 12 as a first scroll and an orbiting scroll 13 as a second scroll is provided inside a housing 11.

The housing 11 is composed of a housing body 11A and a lid 11B. The housing body 11A has a hollow shape in which a cylindrical large diameter portion 11Aa and a small diameter portion 11Ab are integrally formed. The large-diameter portion 11Aa side of the housing main body 11A is fixed and closed by a plurality of bolts 20 in a state where the bowl-shaped lid 11B is fitted to the open end thereof. The drive shaft 14 is inserted through the small-diameter portion 11Ab side of the housing body 11A, and the space between the drive shaft 14 and the drive shaft 14 is sealed by a shaft seal 11D. In this way, the housing 11 is configured as a closed container that encloses the entire scroll compression mechanism.

As shown in FIG. 2, the fixed scroll 12 includes a disk-shaped end plate (disk) 12A, a wall body (wrap) 12B that is formed upright on one side surface of the end plate 12A and is spirally formed, have.

As shown in FIG. 2 and FIG. 3, the fixed scroll 12 is high on the side of the end plate 12A where the wall 12B is erected and high on the center side along the direction of the vortex of the wall 12B and low on the outer end side. The stepped portion 12Aa is formed so that Further, in the fixed scroll 12, a stepped portion 12Ba is formed so that the wall portion 12B is low on the center side of the vortex and high on the outer end side. Further, in the fixed scroll 12, a groove is formed at the edge of the wall 12B, and the tip seal 12Bb is provided in the groove. In the present embodiment, as shown in FIG. 3, the fixed scroll 12 is formed with a bypass hole 12Ab in the end plate 12A for preventing excessive compression in a compression chamber S1 described later.

As shown in FIG. 2, the orbiting scroll 13 has a disk-shaped end plate (disk) 13A and a wall spirally formed on one side surface of the end plate 13A, as in the fixed scroll 12. And a body (wrap) 13B.

As shown in FIG. 2 and FIG. 4, the orbiting scroll 13 has a central portion along the vortex direction of the wall body 13B on one side surface of the end plate 13A where the wall body 13B is erected, as in the fixed scroll 12. The stepped portion 13Aa is formed so that it is higher at the outer end and lower at the outer end side. In the orbiting scroll 13, a stepped portion 13Ba is formed so that it is low on the center side of the vortex and high on the outer end side of the wall 13B. Further, in the orbiting scroll 13, a groove is formed at the edge of the wall 13B, and the tip seal 13Bb is provided in the groove.

As shown in FIG. 1, the fixed scroll 12 and the orbiting scroll 13 are disposed in the large diameter portion 11Aa of the housing body 11A, and face one side surface of the end plates 12A and 13A and face each other to the wall bodies 12B and 13B. Are combined so as to be engaged with each other by shifting the phase by 180° and the tip is in contact with one side surface of the end plates 12A, 13A, the compression chamber S1 is placed in the space defined by the end plates 12A, 13A and the wall bodies 12B, 13B. Is formed. At this time, the fixed scroll 12 and the orbiting scroll 13 are engaged with each other by the step portions 12Aa, 13Aa and the stepped portions 12Ba, 13Ba in a state of being combined with each other. Further, as shown in FIG. 1, in the housing body 11A, a suction chamber S3 communicating with the compression chamber S1 is formed on the outer periphery where the wall bodies 12B and 13B of the fixed scroll 12 and the orbiting scroll 13 are combined. The housing body 11A has a suction port 11Ac for sucking the refrigerant gas, and the suction port 11Ac opens into the suction chamber S3.

As shown in FIG. 1, the fixed scroll 12 is attached to the lid body 11B by a plurality of bolts 21 in a state where the outer peripheral portion of the other side surface of the end plate 12A is in close contact with and fitted to the inner peripheral surface of the lid body 11B. In contrast, it is fixed at multiple locations. In this way, the discharge chamber S2, which is the space between the fixed scroll 12 and the lid 11B of the housing 11, is defined on the other side of the end plate 12A. The fixed scroll 12 is provided with a discharge port 12C formed in the end plate 12A at a central position of the wall 12B in a spiral shape so as to penetrate therethrough so as to communicate with the compression chamber S1 and the discharge chamber S2. Further, the fixed scroll 12 is provided with a discharge valve 12D formed by a leaf spring so that the end plate 12A opens the discharge port 12C only when a pressure of a predetermined magnitude or more is applied.

Further, the orbiting scroll 13 is a shaft in which the drive shaft 14 extends because the other side surface of the end plate 13A abuts on a wall surface 11Ad which is a boundary between the large diameter portion 11Aa and the small diameter portion 11Ab in the housing body 11A. Movement in the direction is restricted.

As described above, the drive shaft 14 is inserted through the small diameter portion 11Ab of the housing body 11A. As shown in FIG. 1, the drive shaft 14 is rotatable in the small-diameter portion 11Ab with one end 14A supported by a bearing 22 and a large-diameter disk portion 14B formed in the central portion supported by a bearing 23. It is provided in. Further, at the other end of the drive shaft 14, an eccentric shaft 14C that is eccentric with respect to the rotation center of the drive shaft 14 is provided integrally with the disc portion 14B. The eccentric shaft 14C pivotally moves as the drive shaft 14 rotates.

The eccentric shaft 14C has a balance bush 24 fitted to the outer peripheral portion thereof. The balance bush 24 pivotally moves integrally with the eccentric shaft 14C. Further, the balance bush 24 is integrally provided with a balance weight 24A for canceling an unbalance amount generated in the orbiting scroll 13. A portion of the balance bush 24 fitted to the eccentric shaft 14C is formed in a columnar shape, and an annular drive bush 25 is attached to the outer peripheral portion thereof.

On the other hand, the orbiting scroll 13 is provided with a boss 13C that projects to the center of the other side of the end plate 13A. The boss 13C is formed with a circular recess 13D having a center at a position at the center of the spiral of the wall 12B. A drive bush 25 is inserted into the recess 13D of the orbiting scroll 13 via a bearing 26 so as to be relatively rotatable. Further, the orbiting scroll 13 has a circular rotation regulating recess 13E formed on the outer peripheral portion on the other side of the end plate 13A. A plurality of rotation regulating recesses 13E are provided around the recess 13D. A rotation prevention pin 11Ae fixed to the housing body 11A is inserted into the rotation regulation recess 13E. The rotation prevention pin 11Ae is inserted into the rotation restriction recess 13E to prevent rotation of the orbiting scroll 13.

The drive shaft 14 is driven to rotate by the drive unit 15. The drive unit 15 has a pulley 15A rotatably supported by a bearing 27 mounted on the outer peripheral portion of the small diameter portion 11Ab of the housing body 11A. The drive unit 15 also has a rotary plate 15B fixed to the one end 14A of the drive shaft 14 by a nut 28. A support ring 15C is connected to the outer periphery of the rotary plate 15B. The end surface of the pulley 15A is fixed to the support ring 15C. Further, the pulley 15A has an electromagnetic clutch 15D provided therein. Rotation from a drive source (for example, an engine) is transmitted to the pulley 15A via a drive belt (not shown).

In the scroll compressor 10 configured as described above, the rotation of the drive source is transmitted to the pulley 15A of the drive unit 15 and the drive shaft 14 rotates while the electromagnetic clutch 15D is released. The rotation of the drive shaft 14 causes the eccentric shaft 14C to eccentrically rotate. Then, the rotational movement of the eccentric shaft 14C is transmitted to the orbiting scroll 13 via the balance bush 24 and the drive bush 25. The orbiting scroll 13 orbits while revolving while being prevented from rotating due to the engagement of the rotation restricting recess 13E and the rotation prevention pin 11Ae. As a result, the refrigerant gas is sucked into the suction chamber S3 in the housing 11 from the suction port 11Ac, and the refrigerant gas in the suction chamber S3 is sucked into the compression chamber S1. Then, as the orbiting scroll 13 continues to orbit, the compression chamber S1 is gradually narrowed toward the center of the scrolls 12 and 13 accordingly, and the volume of the compression chamber S1 is reduced, so that the refrigerant gas inside is compressed and each scroll 12 is compressed. , 13 to reach the discharge port 12C, and the discharge valve 12D opens and closes due to the differential pressure between the compression chamber S1 and the discharge chamber S2. That is, when the refrigerant gas in the compression chamber S1 is compressed and its pressure becomes higher than the pressure in the discharge chamber S2, this refrigerant gas pushes the discharge valve 12D open and flows out to the discharge chamber S2. After that, the high-pressure refrigerant gas is discharged from the discharge chamber S2 to the outside of the housing 11 through a discharge port (not shown) formed in the lid 11B, and is introduced into the air conditioner mounted on the vehicle.

Hereinafter, a method and an apparatus for manufacturing the compressor scroll of the present embodiment will be described. FIG. 5 is a schematic view showing the method for manufacturing the compressor scroll according to the present embodiment. FIG. 6 is a schematic side view showing a compressor scroll manufacturing apparatus according to the present embodiment. In the following description, the compressor scroll includes the fixed scroll 12 and the orbiting scroll 13 described above, and will be simply referred to as a scroll hereinafter. Further, in the following description, as a scroll, the orbiting scroll 13 is illustrated and described as a scroll in FIGS.

The method and apparatus for manufacturing the compressor scroll of the present embodiment improve the occurrence of cracks at the corners of the end plate 13A and the wall 13B of the scroll 13 in order to improve the occurrence of water jets in water at the corners. By colliding the liquid flow containing the cavitation bubbles generated by the cavitation phenomenon by the jetting, a compressive residual stress is generated in the metal material by the impact force generated by the collapse of the cavitation bubbles.

Here, as shown in FIG. 5, a desired portion where a crack is apt to appear and a compressive residual stress is desired to be generated is the root of the wall 13B of the vortex near the stepped portion 13Ba. There is a corner portion A and each corner portion B of the root of the wall body 13B of the vortex near the stepped portion 13Aa. The corners A and B have a shape that facilitates stress concentration. In particular, the corner B is a portion where the corners meet and the stress is particularly likely to concentrate. Therefore, it is desired that the cavitation bubbles collide with the corners A and B.

Therefore, in the method for manufacturing the compressor scroll of the present embodiment, as shown in FIG. 5, as the water jet peening step, the cavitation bubbles C are jetted toward one side surface of the end plate 13A of the scroll 13, and the cavitation bubbles are injected. With the center P of C separated from the spiral center O of the wall 13B in the end plate 13A, the stepped portion 13Aa is formed on the outer peripheral portion of the range of the cavitation bubble C (the range of the circle indicated by the chain double-dashed line in FIG. 5). And the stepped portion 13Ba is positioned. The position of the center P of the cavitation bubble C is, as shown in FIG. 5, a corner P1 where the corners A and B are located on a straight line in the spiral passage formed by the wall 13B or a corner in the spiral passage formed by the wall 13B. There is P2 where the part B is located on a straight line, and P3 where the corner part B is located on a straight line in the spiral passage formed by the wall 13B.

For example, when the center P of the cavitation bubble C is located on the spiral center O of the wall 13B of the end plate 13A, the corners A and B should not be located on a straight line in the spiral passage of the wall 13B. Therefore, it is considered that the flow of the liquid flow containing the cavitation bubbles C is disturbed and disturbed by the wall 13B, so that the cavitation bubbles C are less likely to collide with the corners A and B.

On the other hand, according to the method for manufacturing the compressor scroll of the present embodiment, as described above, the center P of the cavitation bubble C is separated from the spiral center O of the wall 13B of the end plate 13A. When the step portion 13Aa and the stepped portion 13Ba are located on the outer peripheral portion of the range of the cavitation bubble C, the position of the center P of the cavitation bubble C is changed to the step portion 13Aa and the stepped portion 13Ba in the spiral passage by the wall 13B. Since the walls 13B reach the corners A and B and are located at the straight positions P1, P2 and P3 and the flow of the liquid flow containing the cavitation bubbles C is not blocked by the wall 13B, the cavitation bubbles are generated in the corners A and B. C can be collided. That is, the cavitation bubbles C can be appropriately made to collide with a desired portion of the scroll 13, a compressive residual stress can be generated at the desired portion, and the generation of cracks can be prevented.

Further, in the method for manufacturing the compressor scroll of the present embodiment, as shown in FIG. 5, the water jet peening step includes the positions P1, P2, P3 of the cavitation bubble C and the scroll 13, and the step portion 13Aa. The cavitation bubble C and the scroll 13 are moved relative to each other so as to intersect a virtual line L that connects the stepped portion 13Ba with a straight line. Regarding the movement, the cavitation bubble C, the scroll 13, and the cavitation bubble C and the scroll 13 are moved.

According to this method for manufacturing a scroll for a compressor, the cavitation bubbles C can be appropriately made to collide with desired portions (corners A and B) of the scroll 13, compressive residual stress is generated at the desired portions, and cracks are generated. Can be prevented.

In the method for manufacturing the compressor scroll of the present embodiment, in the water jet peening step, the relative movement of the cavitation bubble C and the scroll 13 is predetermined at the positions P1, P2, P3 of the cavitation bubble C and the scroll 13. Stop for hours.

According to this method for manufacturing a scroll for a compressor, the cavitation bubbles C can be made to sufficiently collide with desired portions (corners A and B) of the scroll 13, and a compressive residual stress is generated at the desired portions, and cracks are generated. Occurrence can be prevented. The predetermined time is a time required to generate a compressive residual stress at a desired location.

In addition, in the method for manufacturing the compressor scroll of the present embodiment, the water jet peening step is performed before the surface treatment is performed on the scroll 13.

As the surface treatment, for example, when the scroll 13 is formed of an aluminum alloy, there is an alumite treatment for coating the surface with alumite in order to improve its corrosion resistance and wear resistance. When this surface treatment is performed, the generation of compressive residual stress due to the collision of the cavitation bubbles C is suppressed, and the effect of preventing the generation of cracks may be reduced. Therefore, according to the method for manufacturing a scroll for a compressor, the water jet peening step is performed before the surface treatment is performed on the scroll 13 to assist the generation of the compressive residual stress due to the collision of the cavitation bubbles C and to prevent cracks. The effect of preventing the occurrence of can be remarkably obtained.

Further, in the method for manufacturing the compressor scroll of the present embodiment, the cleaning liquid is mixed in the water that causes the cavitation bubbles C.

According to this method for manufacturing a scroll for a compressor, the scroll 13 can be washed with the washing liquid at the same time as the water jet peening step.

Here, a compressor scroll manufacturing apparatus for carrying out the above-described compressor scroll manufacturing method will be described.

As shown in FIG. 6, the compressor scroll manufacturing apparatus 1 according to the present embodiment includes a container 2 filled with water, a positioning unit 3 for positioning and positioning a scroll 13 in the container 2, and a container 2 inside. Water jet injection means 4 having a nozzle 4A which is disposed in the water and injects a water jet J toward the scroll 13.

In the container 2, the cavitation bubbles C generated by the water jet J ejected from the nozzle 4A can obtain a water depth at which the above water jet peening process can be performed on the scroll 13 positioned by the positioning means 3. ..

The positioning means 3 positions and positions the scroll 13 in the container 2 so that the water jet peening process described above can be performed. The positioning means 3 includes, for example, an abutting portion 3A that abuts on the other side surface of the end plate 13A of the scroll 13, and a chuck portion 3B that engages with a plurality of locations (for example, three locations) on the periphery of the end plate 13A of the scroll 13. And.

The water jet ejecting unit 4 has a nozzle 4A, a nozzle support portion 4B that supports the nozzle 4A, and a high-pressure water pump 4C that supplies high-pressure water to the nozzle 4A.

The compressor scroll manufacturing apparatus 1 directs the cavitation bubbles C generated in the water of the container 2 by the water jet J of the water jet ejecting means 4 toward one side surface of the scroll 13 positioned by the positioning means 3. As shown in FIG. 5, in the state where the center P of the cavitation bubble C is separated from the spiral center O of the wall 13B in the end plate 13A, the step portion 13Aa and the step portion 13Aa are formed on the outer peripheral portion of the cavitation bubble C. Position the stepped portion 13Ba.

According to such a compressor scroll manufacturing apparatus 1, the water jet peening step in the above-described compressor scroll manufacturing method can be performed.

Further, in the compressor scroll manufacturing apparatus 1 of the present embodiment, the positioning means 3 engages with the end plate 13A of the scroll 13 to fix the scroll 13 to the contact portion 3A and the chuck portion 3B. Have.

According to this compressor scroll manufacturing apparatus 1, by fixing the scroll 13 by the fixing mechanism, the scroll 13 is held when the cavitation bubbles C collide with the scroll 13, and desired positions (corner portions A and B) are provided. The cavitation bubbles C can be appropriately made to collide with each other, a compressive residual stress can be generated at the desired portion, and the generation of cracks can be prevented.

Further, in the compressor scroll manufacturing apparatus 1 of the present embodiment, the positioning means 3 includes the cavitation bubbles C and the positions P1, P2, P3 of the scroll 13, as shown in FIGS. A moving mechanism 3C that moves the scroll 13 is provided so as to intersect with a virtual line L that connects the step portion 13Aa and the stepped portion 13Ba with a straight line.

The moving mechanism 3C moves in parallel while supporting the fixing mechanism (the contact portion 3A and the chuck portion 3B), and is preferably a belt conveyor, for example.

According to the compressor scroll manufacturing apparatus 1, the cavitation bubbles C can be appropriately made to collide with desired portions (corner portions A and B) of the scroll 13, and a compressive residual stress is generated at the desired portion, and cracks are generated. Occurrence can be prevented.

Further, in the compressor scroll manufacturing apparatus 1 of the present embodiment, the moving mechanism 3C has a plurality of fixing mechanisms to move the plurality of scrolls 13.

According to the compressor scroll manufacturing apparatus 1, the cavitation bubbles C can be sequentially made to collide with desired portions (corners A and B) of the plurality of scrolls 13 as appropriate. As a result, the water jet peening step in the method for manufacturing a compressor scroll described above can be efficiently performed.

Further, in the compressor scroll manufacturing apparatus 1 of the present embodiment, the water jet injection means 4 has a swirl mechanism 4D that swivels the nozzle 4A so that the cavitation bubbles C swirl with respect to the scroll 13.

The swivel mechanism 4D is provided in the nozzle support portion 4B, and tilts the jetting direction of the water jet J from the nozzle 4A with respect to the vertical line V shown in FIG. 6 and rotates it about a vertical axis. By doing so, the cavitation bubbles C directly collide with the desired portions (corners A and B) which are the inner corners of the end plate 13A and the wall body 13B, so that the cavitation bubbles C are applied to the desired portions of the scroll 13. Can be sufficiently collided.

1 Compressor Scroll Manufacturing Device 2 Container 3 Positioning Means 3C Moving Mechanism 4 Water Jet Injecting Means 4A Nozzle 4D Turning Mechanism 12 Fixed Scroll (First Scroll)
12A End plate 12Aa Step portion 12B Wall body 12Ba Stepped portion 13 Orbiting scroll (second scroll)
13A End plate 13Aa Stepped portion 13B Wall body 13Ba Stepped portion A, B Corner C Cavitation bubble J Water jet L Virtual line O Center P Center P1, P2, P3 Position

Claims (4)

A first scroll in which a spiral first wall body is provided on one side surface of the first end plate, and a spiral second wall body is provided on one side surface of the second end plate, and the second wall body is defined as follows. A second scroll supported while being revolvable while being prevented from rotating in a state of being meshed with the first wall of the first scroll, and the height of each one side surface of each end plate A stepped portion that is higher on the center side of the vortex along each of the wall bodies and lower on the outer end side, and a height of each wall body is lower on the center side of the vortex and higher on the outer end side, A scroll for a compressor in which a stepped portion that engages with the step portion of each other is formed,
Either one of the first scroll or the second scroll is provided with a first corner portion of the root of each wall near the stepped portion or each step portion. a second corner of the base of each of said wall bodies near by and has a compressive residual stress,
In either one of the first scroll or the second scroll, the spiral center of each of the wall bodies in each of the end plates, each of the step portions, and each of the stepped portions are located on a straight line. A scroll for a compressor , wherein the compressive residual stress is linearly provided so as to intersect the straight line . A first scroll in which a spiral first wall body is provided on one side surface of the first end plate, and a spiral second wall body is provided on one side surface of the second end plate, and the second wall body is defined as follows. A second scroll supported while being revolvable while being prevented from rotating in a state of being meshed with the first wall of the first scroll, and the height of each one side surface of each end plate A stepped portion that is higher on the center side of the vortex along each of the wall bodies and lower on the outer end side, and a height of each wall body is lower on the center side of the vortex and higher on the outer end side, A scroll for a compressor in which a stepped portion that engages with the step portion of each other is formed,
Either one of the first scroll or the second scroll is provided with a first corner portion of the root of each wall near the stepped portion and each step portion. a second corner of the base of each of said wall bodies near by and has a compressive residual stress,
In either one of the first scroll or the second scroll, the spiral center of each of the wall bodies in each of the end plates, each of the step portions, and each of the stepped portions are located on a straight line. A scroll for a compressor , wherein the compressive residual stress is linearly provided so as to intersect the straight line . Surface treatment to each of said scroll is performed, the compressor scroll according to claim 1 or 2. Scroll compressor which is applied the compressor scroll according to any one of claims 1-3.

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