JP2015197076A - Compressor sliding component, and scroll compressor having the component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide, in a swirling body to be mounted on one principal plane of a base plate, a sliding part for a compressor capable of suppressing the formation of a shrinkage cavity, and a scroll compressor having the sliding part.SOLUTION: Swirl bodies 32 and 42 are equipped with fins 33 and 43 to improve the heat transfer and the heat dissipation of the swirl bodies 32 and 42 after casting, so that they solidify earlier than the other portions of the sliding components. As a result, the shortage of the molten metal due to the solidification shrinkage to occur at the swirl bodies 32 and 42 is compensated from the molten metal of the remaining portions of the sliding components so that the occurrence of the shrinkage cavity in the swirling bodies 32 and 42 can be suppressed.

Description

  The present invention relates to a sliding part of a compressor and a scroll compressor including the same.

  Conventionally, as a sliding part of a compressor such as a scroll compressor, a fixed scroll and an orbiting scroll in which a spiral body is provided on one main surface of a disk-shaped base plate are used. The fixed scroll and the orbiting scroll constitute a compression unit of the scroll compressor by fitting the spiral bodies to each other.

  These sliding parts have a complicated shape having a spiral body having a high aspect ratio, and are formed by molding with high precision machining after molding by casting or die casting in order to reduce the machining amount. As the material, iron added with C, Si, Cr, Mn, etc. is used. In particular, spheroidal graphite cast iron in which the shape of graphite dispersed in iron is spherical has high fatigue strength and is resistant to friction. It is suitable as a material for sliding parts.

  On the other hand, sliding parts are complicated in shape, and spheroidal graphite cast iron has the property of easily generating shrinkage cavity (casting cavity) compared to other casting materials. Shrink nests may form inside or outside With respect to the problem of shrinkage nest, Patent Document 1 discloses that a sliding part molded by a semi-melt molding method uses a mold having a convex portion for forming a thin portion near the center of the part. The occurrence of shrinkage nests in the thick part is suppressed.

JP 2007-263107 A

  As described above, in conventional sliding parts, when a metal material, particularly spheroidal graphite cast iron, is formed by casting, shrinkage cavities may be generated inside or outside the part. It was a cause of deterioration of hermeticity. The sliding component presented in Patent Document 1 can suppress the formation of a shrinkage nest at the center of the base plate, but has no effect on the shrinkage nest generated in the spiral body.

  The present invention has been made to solve the above-described problems, and is a compressor sliding component capable of suppressing the formation of shrinkage cavities in a spiral body provided on one main surface of a base plate. The purpose is to obtain. It is another object of the present invention to provide a scroll compressor having a high reliability and a long life provided with this sliding part.

  A sliding component of a compressor according to the present invention is a sliding component of a compressor in which a spiral body having a side surface perpendicular to the main surface is provided on one main surface of a disk-shaped base plate, It has a plurality of fins that protrude in the direction parallel to the main surface of the base plate starting from the side surface of the spiral body in the state of being taken out from the mold used for molding.

  Moreover, the scroll compressor which concerns on this invention is equipped with the sliding component of the compressor from which the said fin was removed by machining, and compresses a refrigerant | coolant in the compression chamber formed by a pair of sliding component.

  According to the present invention, by providing fins in the spiral body, the heat conductivity and heat dissipation of the spiral body after casting are improved and solidify faster than other parts of the sliding part. The shortage of the molten metal accompanying the generated solidification shrinkage is compensated by the molten metal in the other part of the sliding component, and the occurrence of shrinkage nests in the spiral body can be suppressed.

  In addition, the scroll compressor provided with the sliding component according to the present invention can suppress the generation of shrinkage cavities especially in a spiral body having a large amount of sliding, and thus has a long life and high reliability.

It is sectional drawing which shows the scroll compressor which concerns on Embodiment 1 of this invention. It is a figure which shows the fixed scroll integrated in the scroll compressor which concerns on Embodiment 1 of this invention. It is a figure which shows the rocking scroll built in the scroll compressor which concerns on Embodiment 1 of this invention. It is a bottom view which shows the as-cast item of the fixed scroll which concerns on Embodiment 1 of this invention. It is a top view which shows the as-cast item of the rocking scroll which concerns on Embodiment 1 of this invention. It is an enlarged view which shows the example of a shape of the fin which concerns on Embodiment 1 of this invention. It is an enlarged view which shows the example of a shape of the fin which concerns on Embodiment 2 of this invention. It is an enlarged view which shows another example of the shape of the fin which concerns on Embodiment 2 of this invention. It is an enlarged view which shows another example of the shape of the fin which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
Below, the sliding component of the scroll compressor which concerns on Embodiment 1 of this invention is demonstrated based on drawing. FIG. 1 is a cross-sectional view showing the overall configuration of a scroll compressor in which the sliding component according to the first embodiment is used. 2 is a cross-sectional view (a) showing a fixed scroll incorporated in the scroll compressor shown in FIG. 1, and (b) is a bottom view. FIG. 3 shows swinging incorporated in the scroll compressor shown in FIG. It is (a) sectional drawing which shows a scroll, (b) Top view, (c) Bottom view. In addition, in the figure, the same code | symbol is attached | subjected to the same part.

  As shown in FIG. 1, a scroll compressor 1 (hereinafter abbreviated as “compressor 1”) includes a fixed scroll 3 and a swing scroll 4 that are sliding parts arranged in an upper part of a hermetic shell 2. . In addition, a stator 5 and a rotor 6 constituting an electric mechanism unit are disposed in an intermediate part in the shell 2. The stator 5 is fixed to the inner peripheral surface of the shell 2, and the rotor 6 is fixed to the main shaft 7.

  The fixed scroll 3, the swing scroll 4, and the frame 8 constitute a compression unit of the compressor 1. As shown in FIG. 2, the fixed scroll 3 includes a disk-shaped base plate 31 and a spiral body 32 provided on one main surface of the base plate 31. Further, as shown in FIG. 3, the orbiting scroll 4 includes a disk-shaped base plate 41 and a spiral body 42 provided on one main surface of the base plate 41, and the other main surface of the base plate 41. Is provided with a rocking bearing 44. In the compressor 1, as shown in FIG. 1, the fixed scroll 3 is disposed on the upper side, and the swing scroll 4 is disposed on the lower side.

  The spiral body 32 of the fixed scroll 3 and the spiral body 42 of the orbiting scroll 4 have substantially the same shape, and the center of each spiral is eccentric and the phase inside the compressor 1 is shifted by 180 degrees. Are combined. Between the spiral body 32 of the fixed scroll 3 and the spiral body 42 of the swing scroll 4, a compression chamber 9 having a relatively variable volume is formed.

  The base plate 31 of the fixed scroll 3 is fixed to the open end of the frame 8 whose upper end is open by a bolt or the like. A discharge port 10 is formed at the center of the fixed scroll 3 to discharge the compressed refrigerant gas having a high pressure.

  A slider 11 is rotatably inserted into a rocking bearing 44 formed near the center of the bottom surface of the rocking scroll 4, and the main shaft 7 is further inserted into the slider 11. The inner peripheral part of the rocking bearing 44 and the outer peripheral part of the slider 11 are in close contact with each other through the lubricating oil, thereby constituting the rocking bearing part. The orbiting scroll 4 is pivotally supported on the main shaft 7 via a rocking bearing portion, and the main shaft 7 is further pivotally supported on the frame 8 via a main bearing 12 formed on the frame 8.

  The outer periphery of the frame 8 is fixed to the inner peripheral surface of the shell 2. A space for accommodating the Oldham ring 13 is formed at the center of the upper surface of the frame 8. The orbiting scroll 4 performs a revolving orbiting motion (oscillating motion) without rotating about the fixed scroll 3 by the Oldham ring 13 for preventing the rotating motion. At this time, the centrifugal force due to the eccentric rotational motion of the orbiting scroll 4 acts on the main shaft 7.

  Further, a suction pipe 14 for introducing refrigerant gas from the outside and a discharge pipe 15 for discharging refrigerant gas to the outside are attached to the shell 2. A subframe 16 that rotatably supports the main shaft 7 is fixed to the lower portion of the shell 2. An oil pump 17 is provided at the lower portion of the subframe 16 to suck up oil accumulated at the bottom of the shell 2 through the oil supply passage in the main shaft 7 to the slider 11.

  The drive unit of the compressor 1 includes a stator 5 fixed to the inner peripheral side of the shell 2, a rotor 6 fixed to the main shaft 7, a main shaft 7 that is a rotating shaft, and the like. When a power supply terminal (not shown) is energized, torque is generated between the stator 5 and the rotor 6 and the main shaft 7 rotates. As a result, the orbiting scroll 4 fixed to the slider 11 mounted on the main shaft 7 starts revolving motion.

  The refrigerant gas that has entered the compression unit from the suction pipe 14 is taken into the compression chamber 9 formed by the fixed scroll 3 and the swing scroll 4 and is compressed to a high pressure. The refrigerant gas compressed in the compression chamber 9 passes through the discharge port 10 and is discharged to the discharge space 18, and then discharged to the outside of the shell 2 through the discharge pipe 15.

  Next, a method for manufacturing the fixed scroll 3 and the swing scroll 4 will be described. The fixed scroll 3 and the swing scroll 4 are manufactured by a sand casting method or a die casting method. In the first embodiment, spheroidal graphite cast iron is used as a material, and a return material, iron scrap, a carburizing agent, an inoculating agent, and a spheroidizing agent are appropriately blended with pig iron.

  The components of the fixed scroll 3 and the orbiting scroll 4 after molding are: C: 2.5 wt% to 4.0 wt%, Si: 1.0 wt% to 4.0 wt%, Mn: 0.4 wt% or less, P: 0 0.08 wt% or less, S: 0.02 wt% or less, and the balance is iron containing alloy elements derived from the material and inevitable impurities. The above weight ratio is a ratio to the total amount. The content of each of these elements satisfies both that the tensile strength is 400 MPa or more and the fluidity suitable for casting the fixed scroll 3 and the orbiting scroll 4 having a complicated shape is provided. To be determined.

  Pig iron, return material, iron scrap, and carburizing agent are appropriately charged into a heating furnace, heated to a temperature in the range of 1450 ° C. to 1600 ° C. and melted to make a molten metal. Noro and slag generated at this time are appropriately removed using a demolding agent. Subsequently, when the molten metal is transferred to a ladle, an inoculant and a spheronizing agent are added to cause a spheronization reaction.

  Thereafter, when the molten metal is poured into a mold (sand mold or mold) for casting the fixed scroll 3 or the swing scroll 4 at a temperature of 1300 ° C. to 1450 ° C., a shape corresponding to the shape of the internal space of the mold is obtained. The molten metal solidifies and the fixed scroll 3 or the swing scroll 4 is cast. The heating temperature in the heating furnace and the temperature during pouring are determined so as to have appropriate fluidity for casting the fixed scroll 3 and the orbiting scroll 4.

  The cast fixed scroll 3 and the orbiting scroll 4 are taken out of the mold and cooled, and then subjected to further high-precision machining, resulting in the shapes shown in FIGS. FIGS. 4 and 5 show an as-cast fixed scroll 3 and an orbiting scroll 4 taken out of the mold before the machining.

  As shown in FIG. 4, the as-cast fixed scroll 3 has a plurality of fins 33 in a spiral body 32. The spiral body 32 has a side surface perpendicular to the main surface of the base plate 31, and the fins 33 protrude from the side surface of the spiral body 32 in a direction parallel to the main surface of the base plate 31.

  Moreover, the as-cast rocking scroll 4 has a plurality of fins 43 in a spiral body 42 as shown in FIG. The spiral body 42 has a side surface perpendicular to the main surface of the base plate 41, and the fin 43 protrudes in a direction parallel to the main surface of the base plate 41 starting from the side surface of the spiral body 42. These fins 33 and 43 are cast simultaneously with the spiral bodies 32 and 42.

  Thus, by providing the fins 33 and 43 on the spiral bodies 32 and 42, the heat transfer and heat dissipation of the spiral bodies 32 and 42 after casting are improved, so that they solidify faster than other parts of the sliding parts. become. Thereby, the shortage of the molten metal accompanying solidification shrinkage generated in the spiral bodies 32 and 42 is compensated from the molten metal in the other part of the sliding part, and the occurrence of shrinkage cavities in the spiral bodies 32 and 42 can be suppressed.

  An example of the shape of the fins 33 and 43 in the first embodiment will be described with reference to FIG. 6 shows the fins 33 provided on the spiral body 32 of the fixed scroll 3, the same applies to the fins 43 provided on the spiral body 42 of the orbiting scroll 4. Description is omitted.

  The fin 33 has a rectangular cross-sectional shape parallel to the main surface of the base plate 31. The height of the fin 33 is formed to be equal to or less than the height of the spiral body 32. Further, the length of the fin 33 is set so as not to contact the spiral body 32 on the inner peripheral side or the outer peripheral side of the spiral body 32 that is the starting point of the fin 33.

  However, the number and arrangement of the fins 33 are not particularly limited as long as the heat conductivity and heat dissipation of the spiral body 32 are improved. In FIG. 6, although it arrange | positions in the same position of the inner peripheral side of the spiral body 32 used as the starting point of the fin 33, and an outer peripheral side, you may arrange | position only in one side and it is in a different position on the inner peripheral side and outer peripheral side. It may be arranged. The intervals between the fins 33 may be regular or irregular, and may be arranged at the tip of the spiral body 32.

  The fins 33 and 43 are removed by machining before the fixed scroll 3 and the swinging scroll 4 are incorporated into the compressor 1. Specifically, it is removed by cutting such as end milling or grinding with a shaft-equipped grindstone. After removing the fins 33 and 43, the fixed scroll 3 and the orbiting scroll 4 shown in FIGS.

Even in the manufacturing process of the conventional fixed scroll and the orbiting scroll that do not have the fins 33 and 43, roughing and finishing are necessary to obtain a desired shape after casting. If the cutting depth, machining speed, and the like of the machining during the rough machining are changed to remove the fins 33 and 43, the sliding component according to the first embodiment can be obtained without increasing the number of man-hours. Can be manufactured.

  According to the first embodiment, the fins 33 and 43 are provided on the spiral bodies 32 and 42 of the fixed scroll 3 and the orbiting scroll 4 that are sliding parts of the compressor 1, so that heat transfer and heat dissipation after casting are achieved. And the solidification of the spiral bodies 32, 42 is completed earlier than the other parts of the sliding component, so that it is possible to suppress the occurrence of shrinkage cavities in the spiral bodies 32, 42 having a particularly large sliding amount. . Thereby, a sliding part with high fatigue strength and a long life can be obtained. Moreover, the compressor 1 using this sliding component has a long life and high reliability.

Embodiment 2. FIG.
Since the overall configuration of the compressor 1 according to Embodiment 2 of the present invention is the same as that of Embodiment 1 above, FIG. 1 is used and description thereof is omitted. In the second embodiment, a modification of the shape of the fins 33 and 43 described in the first embodiment will be described with reference to FIGS. 7 to 9 show the fins 33a, 33b, and 33c provided on the spiral body 32 of the fixed scroll 3, the same applies to the spiral body 42 of the orbiting scroll 4. The description is omitted.

  In the example shown in FIG. 7, the spiral body 32 is provided with fins 33 a having a substantially semicircular cross section parallel to the main surface of the base plate 31. The height of the fin 33a is set to be equal to or lower than the height of the spiral body 32. The length of the fin 33a is set to a length that does not contact the spiral body 32 on the inner peripheral side or the outer peripheral side of the spiral body 32 that is the starting point of the fin 33a. By adopting such a substantially semicircular fin 33a, the area of the base of the fin 33a increases, and the inflow of the molten metal into the fin 33a becomes easy.

  In the example shown in FIG. 8, the spiral body 32 is continuously provided with fins 33 b having a triangular cross section parallel to the main surface of the base plate 31. The height of the fin 33b is set to be equal to or lower than the height of the spiral body 32. In addition, the length of the fin 33b is set to a length that does not contact the spiral body 32 on the inner peripheral side or the outer peripheral side of the spiral body 32 that is the starting point of the fin 33b. By providing such triangular fins 33b continuously, even when the interval between the spiral bodies 32 is narrow and the length of the fins 33b cannot be increased, the surface area of the fins 33b is increased and heat dissipation of the spiral bodies 32 is promoted. be able to.

  Moreover, in the example shown in FIG. 9, the fin 33c which connects from the center of the spiral body 32 to the outermost periphery is provided. The height of the fin 33c is set to be equal to or lower than the height of the spiral body 32. The fins 33c for connecting the spiral bodies 32 may be arranged so as to connect all from the center to the outermost periphery, or may be arranged so as to be partially connected to reach the outermost periphery. Also good. The fins 33c connecting the spiral bodies 32 can be provided even when the distance between the spiral bodies 32 is narrow. Further, the heat confined in the center of the spiral body 32 can be discharged to the outermost periphery, and the heat radiation of the outermost spiral body 32 is also promoted by the fins 33c.

  Note that the number and arrangement of the fins 33a, 33b, and 33c shown in FIGS. 7 to 9 are not particularly limited. For example, the spiral body 32 may be disposed at different positions on the inner peripheral side and the outer peripheral side, or may be disposed only on one side. The intervals between the fins 33a, 33b, and 33c may be regular or irregular.

According to the second embodiment, in addition to the same effects as those of the first embodiment, it is possible to deal with the spiral bodies 32 and 42 under various conditions by devising the shape of the fin. It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  The present invention can be used as a sliding component of a scroll compressor.

1 scroll compressor, 2 shell, 3 fixed scroll, 4 swing scroll,
5 Stator, 6 Rotor, 7 Spindle, 8 Frame, 9 Compression chamber, 10 Discharge port,
11 Slider, 12 Main bearing, 13 Oldham ring, 14 Suction pipe, 15 Discharge pipe, 16 Subframe, 17 Oil pump, 18 Discharge space,
31, 41 base plate,
32, 42 spiral body, 33, 33a, 33b, 33c, 43 fins,
44 Swing bearing.

Claims (5)

  In one state of the disk-shaped base plate, a sliding part of a compressor provided with a spiral body having a side surface perpendicular to the main surface, in a state where it is taken out from a mold used for the molding, A sliding part for a compressor, comprising: a plurality of fins protruding from the side surface of the spiral body in a direction parallel to the main surface of the base plate.   The sliding part of the compressor according to claim 1, wherein the fin has a rectangular, substantially semicircular, or triangular cross-sectional shape parallel to the main surface of the base plate.   The sliding part of the compressor according to claim 1, wherein the fin is provided so as to connect a part or all of the spiral body from the center to the outermost periphery.   The sliding part of the compressor according to any one of claims 1 to 3, wherein the fin is removed by machining.   A scroll compressor comprising the sliding component of the compressor according to any one of claims 1 to 4, wherein the refrigerant is compressed in a compression chamber formed by the pair of sliding components.

Images