JP5622514B2 - Scroll compressor - Google Patents

Scroll compressor Download PDF

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Publication number
JP5622514B2
JP5622514B2 JP2010229779A JP2010229779A JP5622514B2 JP 5622514 B2 JP5622514 B2 JP 5622514B2 JP 2010229779 A JP2010229779 A JP 2010229779A JP 2010229779 A JP2010229779 A JP 2010229779A JP 5622514 B2 JP5622514 B2 JP 5622514B2
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Prior art keywords
fluid passage
scroll compressor
fluid
scroll
center
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JP2012082754A (en
Inventor
創 佐藤
創 佐藤
後藤 利行
利行 後藤
央幸 木全
央幸 木全
堀田陽平
陽平 堀田
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三菱重工業株式会社
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008Hermetic pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2250/00Geometry
    • F04C2250/10Geometry of the inlet or outlet
    • F04C2250/101Geometry of the inlet or outlet of the inlet

Description

  The present invention relates to a scroll compressor.
  The scroll compressor combines the spiral-shaped wall bodies of the fixed scroll and the orbiting scroll with the phases shifted from each other and revolves the orbiting scroll, thereby reducing the volume of the pair of compression chambers formed between the wall bodies. The fluid in the compression chamber is compressed by gradually decreasing.
  Conventionally, for example, in the scroll compressor described in Patent Document 1, an outer wall is formed integrally with the fixed scroll so as to surround the wall of the fixed scroll. This scroll compressor is provided with a fluid passage that penetrates the inside and outside of the outer wall and introduces fluid into the compression chamber. The fluid passages are formed by cutting out the outer wall, form a pair corresponding to each compression chamber, and are provided facing each other with the center of the basic circle of the involute in the spiral wall in between. Further, the fluid passage is provided with its opening facing the center of the basic circle.
JP 2007-255191 A
  However, like the scroll compressor described in Patent Document 1 described above, the fluid passage is formed by cutting out the outer wall, the center of the base circle is opposed to the center, and the opening is provided toward the center of the base circle. If so, both the fluid passages and the center of the base circle are arranged in a straight line, and there is a problem that the strength is lowered. For example, due to the pressure difference between the pressure chamber and the compression chamber provided outside the fixed scroll, the fixed scroll may bend around a straight line connecting both fluid passages and the center of the base circle. In this case, contact of the end of each scroll wall becomes excessive and the scroll is damaged, or contact of the end of each scroll wall is insufficient and compression leakage occurs. When a compression leak occurs, the compression performance decreases.
  In addition, as in the scroll compressor described in Patent Document 1 described above, when the opening of the fluid passage is provided toward the center of the base circle, the fluid is introduced toward the center of the base circle and then the fixed scroll. And the flow path bends to the suction port of the compression chamber formed by the orbiting scroll, and flow pressure loss occurs. When flow pressure loss occurs, the compression performance decreases.
  This invention solves the subject mentioned above, and it aims at providing the scroll compressor which can suppress the fall of compression performance while improving the intensity | strength of a fixed scroll.
In order to achieve the above object, a scroll compressor according to the present invention is provided with a spiral wall on the inner surface of an end plate, and an outer wall integrally with the end plate so as to surround the wall. And a scroll compressor having a fixed scroll provided with a pair of fluid passages penetrating inside and outside of the outer wall, the fluid passage has a center line extending from the center of the base circle of the involute in the wall body. The fluid passage is disposed so that the opening of the fluid passage faces the suction port of the compression chamber formed by the wall body, and the side wall surface of the fluid passage is on the suction port side of the compression chamber. It is characterized by extending toward the surface .
  Here, the center line of the fluid passage is a normal passing through the center of a straight line connecting the closest (narrow) portions between the opposite side wall surfaces of the fluid passage. According to this scroll compressor, since the center line of the fluid passage is arranged away from the center of the foundation circle of the involute in the wall body, the direction of the opening of the fluid passage is formed away from the center of the foundation circle. . That is, the direction of the fluid passage (fluid flow direction) is not linearly arranged with the center of the basic circle in between. For this reason, the outer wall in which the fluid passage is not formed is reinforced and the situation where the fixed scroll is bent is avoided. As a result, no damage or compression leakage occurs. As a result, the strength of the fixed scroll can be improved, and a decrease in compression performance can be suppressed.
Furthermore, according to this scroll compressor, the direction of the fluid passage (fluid flow direction) is formed toward the suction port of the compression chamber. For this reason, since the fluid flows toward the suction port of the compression chamber along the direction of the fluid passage, the flow pressure loss is reduced. As a result, a decrease in compression performance can be further suppressed.
  The scroll compressor according to the present invention is characterized in that the opposing side wall surfaces of the fluid passage are provided in parallel.
  According to this scroll compressor, the fluid flows smoothly to the fluid passage, and the flow pressure loss is reduced. As a result, a decrease in compression performance can be further suppressed.
  The scroll compressor according to the present invention is characterized in that the center lines of the fluid passages are provided in parallel.
  According to this scroll compressor, the openings of the fluid passages are formed so as to deviate from each other, and the directions of the fluid passages (fluid flow direction) are not arranged linearly with respect to the center of the basic circle. For this reason, the outer wall in which the fluid passage is not formed is reinforced and the situation where the fixed scroll is bent is further avoided. As a result, no damage or compression leakage occurs. As a result, the strength of the fixed scroll can be further improved, and a decrease in compression performance can be suppressed.
  The scroll compressor according to the present invention is characterized in that a center line of the fluid passage is provided in parallel to a tangent of an outer end portion of the wall body.
  According to this scroll compressor, the direction of the fluid passage (fluid flow direction) is linearly formed toward the suction port of the compression chamber. For this reason, since the fluid flows linearly toward the suction port of the compression chamber along the direction of the fluid passage, the flow pressure loss is most reduced. As a result, the reduction in compression performance can be most suppressed.
  The scroll compressor according to the present invention is characterized in that the interval between the opposing side wall surfaces of the fluid passage is widened toward the inside of the outer wall.
  According to this scroll compressor, since the resistance of the fluid immediately after passing through the fluid passage is reduced, the flow pressure loss is reduced. As a result, a decrease in compression performance can be further suppressed.
  The scroll compressor according to the present invention is characterized in that the opening width of the fluid passage is formed larger than the opening width of the suction port of the compression chamber formed by the wall body.
  According to this scroll compressor, since fluid is reliably introduced into the suction port, it is possible to further suppress a decrease in compression performance.
  The scroll compressor of the present invention is characterized by using carbon dioxide as a fluid to be compressed.
  Carbon dioxide is preferable because it has less influence on the environment than the chlorofluorocarbon refrigerant. In addition, since carbon dioxide has a pressure approximately three times that of the fluorocarbon refrigerant, it is necessary to improve the strength of the fixed scroll, which is suitable for this scroll compressor.
  ADVANTAGE OF THE INVENTION According to this invention, while improving the intensity | strength of a fixed scroll, the fall of compression performance can be suppressed.
FIG. 1 is a schematic cross-sectional view of a scroll compressor according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line II in FIG. FIG. 3 is a cross-sectional view taken along the line II in FIG. 1 and shows another embodiment. FIG. 4 is a cross-sectional view taken along the line II in FIG. 1 and shows another embodiment. FIG. 5 is a cross-sectional view taken along the line II in FIG. 1 and shows another embodiment.
  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.
  FIG. 1 is a schematic cross-sectional view of a scroll compressor according to the present embodiment. As shown in FIG. 1, the scroll compressor 1 includes a housing 2, a fixed scroll 3, a turning scroll 4, and a rotating shaft 5.
  As shown in FIG. 1, the housing 2 is a sealed container in which a fixed scroll 3, a turning scroll 4, and the like are arranged. The housing 2 is provided with a discharge cover 7, a suction pipe (not shown), a discharge pipe 8, and a frame 9. The discharge cover 7 separates the inside of the housing 2 into a high pressure chamber HR and a low pressure chamber LR. The suction pipe guides fluid from the outside to the low pressure chamber LR. The discharge pipe 8 guides the fluid from the high pressure chamber HR to the outside. The frame 9 supports the fixed scroll 3 and the orbiting scroll 4.
  As shown in FIG. 1, the rotary shaft 5 transmits a rotational driving force of a motor (not shown) provided below the housing 2 to the orbiting scroll 4. The rotary shaft 5 is supported substantially vertically in the housing 2 and is rotatably supported. An eccentric pin 5 a that drives the orbiting scroll 4 to revolve orbit is provided at the upper end of the rotating shaft 5. The eccentric pin 5 a is a cylindrical portion that extends upward from the end surface at a position that is eccentric from the rotation center of the rotating shaft 5 by the turning revolution radius r of the orbiting scroll 4 on the end surface of the rotating shaft 5.
  As shown in FIG. 1, the fixed scroll 3 and the orbiting scroll 4 compress the fluid flowing into the low pressure chamber LR of the housing 2 and discharge it to the high pressure chamber HR. The fixed scroll 3 is fixed to the frame 9 in the housing 2, and a spiral fixed side wall 32 is formed on the inner surface (the lower surface in FIG. 1) of the fixed side end plate 31. The fixed end plate 31 has a discharge hole 33 formed in the center thereof. The discharge hole 33 communicates with an opening 7 a provided in the discharge cover 7 and is opened and closed together with the opening 7 a by a discharge reed valve V provided in the discharge cover 7.
  The orbiting scroll 4 has a spiral movable side wall 42 formed on the inner surface (upper surface in FIG. 1) of the movable side end plate 41 facing the inner surface of the fixed side end plate 31. Then, the movable side wall body 42 of the orbiting scroll 4 and the fixed side wall body 32 of the fixed scroll 3 are combined with their phases shifted by 180 °, so that the end plates 31 and 41 and the wall bodies 32 and 42 are partitioned. A compression chamber P is formed. In the orbiting scroll 4, a boss 43 is formed on the outer surface (the lower surface in FIG. 1) of the movable side end plate 41 so as to pass through the eccentric pin 5 a provided at the upper end of the rotating shaft 5. Further, the orbiting scroll 4 is revolved while being prevented from rotating by an annular rotation preventing member 44 disposed between the orbiting scroll 4 and the frame 9 fixed to the housing 2.
  Hereinafter, the fixed scroll 3 in the scroll compressor 1 having the above-described configuration will be described in detail with reference to the drawings. 2 to 5 are II cross-sectional views in FIG.
  As shown in FIGS. 2 to 5, the fixed scroll 3 is provided with an outer wall 34 formed integrally with the end plate 31 so as to surround the spiral wall body 32. In the fixed scroll 3 according to the present embodiment, a concave portion 35 forming a compression chamber P is provided in the central portion of the inner surface of the end plate 31, and a wall body 32 is formed in the concave portion 35. The wall 35 of the orbiting scroll 4 is inserted into the recess 35. The outer wall 34 is formed including a step portion around the recess 35. Bolts 10 (see FIG. 1) for fixing the fixed scroll 3 to the frame 9 are passed through the outer wall 34. The outer wall 34 is formed with a pair of fluid passages 36 penetrating inside and outside.
  The fluid passage 36 is formed by being cut out from the outside of the outer wall 34 to the recess 35, and is for introducing fluid into the compression chamber P. In the fluid passage 36, the center line S is arranged away from the center O of the involute in the wall body 32.
  Here, the center line S of the fluid passage 36 is a normal passing through the center of the straight line A connecting the closest (narrow) portions between the opposite side wall surfaces 36 a of the fluid passage 36. 2 shows a form in which both side wall surfaces 36a of the fluid passage 36 are formed in parallel, and FIG. 3 shows that both side wall surfaces 36a of the fluid passage 36 are not parallel but toward the inside (compression chamber P side). FIG. 4 shows a form in which the side wall surface 36a is inclined so that the opening width is widened, and FIG. The side wall surface 36a is curved. In any case, the center line S is arranged away from the involute basic circle center O in the wall body 32. This center line S corresponds to the flow direction of the fluid passing through the fluid passage 36. Since the center line S of the fluid passage 36 is arranged away from the base circle center O of the involute in the wall body 32, the opening direction of the fluid passage 36 is formed away from the base circle center O. .
  That is, the direction of the fluid passage 36 (fluid flow direction) is not linearly arranged with the basic circle center O in between. For this reason, the step around the outer wall 34 and the recess 35 in which the fluid passage 36 is not formed is reinforced to avoid a situation in which the fixed scroll 3 is bent. As a result, there is no excessive contact between the tips of the wall bodies 32, 42 of the scrolls 3, 4, and there is no shortage of contact between the tips of the wall bodies 32, 42 of the scrolls 3, 4. , 4 and compression leakage do not occur. As a result, according to the scroll compressor 1 of the present embodiment, it is possible to improve the strength of the fixed scroll 3 and to suppress a decrease in compression performance.
  As shown in FIGS. 2 to 5, the fluid passage 36 is disposed with the opening directed toward the suction port of the compression chamber P formed by the walls 32 and 42. Specifically, the fluid passage 36 is formed such that the side wall surface 36 a extends toward the suction port side of the compression chamber P. The suction port of the compression chamber P is formed inside the outer ends of the wall bodies 32 and 42. That is, the fluid passage 36 is formed so that its direction (fluid flow direction) faces the suction port of the compression chamber P. For this reason, since the fluid flows toward the suction port of the compression chamber P along the direction of the fluid passage 36, the flow pressure loss is reduced. As a result, it is possible to further suppress a decrease in compression performance.
  As shown in FIGS. 2 and 5, the fluid passage 36 is provided with opposing side wall surfaces 36a in parallel. For this reason, the fluid flows smoothly to the fluid passage 36, and the flow pressure loss is reduced. As a result, it is possible to further suppress a decrease in compression performance.
  As shown in FIGS. 2 to 5, each fluid passage 36 is provided with the respective center lines S in parallel. That is, the direction of the opening of each fluid passage 36 is formed so as to deviate from each other, and the direction of the fluid passage 36 (fluid flow direction) is not arranged linearly with the basic circle center O in between. For this reason, the step around the outer wall 34 and the recessed part 35 in which the fluid passage 36 is not formed is reinforced and the situation where the fixed scroll 3 is bent is further avoided. As a result, there is no excessive contact between the tips of the wall bodies 32, 42 of the scrolls 3, 4, and there is no shortage of contact between the tips of the wall bodies 32, 42 of the scrolls 3, 4. , 4 and compression leakage do not occur. As a result, according to the scroll compressor 1, it is possible to further improve the strength of the fixed scroll 3 and to suppress a decrease in compression performance.
  As shown in FIG. 5, the fluid passage 36 is provided with a center line S parallel to the tangent T of the outer end portions of the wall bodies 32 and 42. That is, the fluid passage 36 is formed so that its direction (fluid flow direction) is straight toward the suction port of the compression chamber P. For this reason, since the fluid flows linearly toward the suction port of the compression chamber P along the direction of the fluid passage 36, the flow pressure loss is most reduced. As a result, it is possible to most suppress the deterioration of the compression performance.
  Further, as shown in FIGS. 3 and 4, the fluid passage 36 is formed so that the interval between the opposing side wall surfaces 36 a is widened toward the inner side of the outer wall 34 (on the compression chamber P side). For this reason, since the resistance of the fluid immediately after passing through the fluid passage 36 is reduced, the flow pressure loss is reduced. As a result, it is possible to further suppress a decrease in compression performance.
  As shown in FIGS. 2 to 5, the fluid passage 36 has an opening width A that is larger than an opening width B of the suction port of the compression chamber P formed by the walls 32 and 42. For this reason, the fluid is reliably introduced into the suction port. As a result, it is possible to further suppress a decrease in compression performance. The opening width A of the fluid passage 36 is the closest (narrow) portion between the opposite side wall surfaces 36a of the fluid passage 36, and corresponds to the length of the straight line A connecting the both side wall surfaces 36a.
  Moreover, the scroll compressor 1 of this Embodiment is suitable for using a carbon dioxide as a fluid (refrigerant). Carbon dioxide is preferable because it has less influence on the environment than the chlorofluorocarbon refrigerant. In addition, since carbon dioxide has a pressure approximately three times that of the fluorocarbon refrigerant, it is necessary to improve the strength of the fixed scroll, which is suitable for the scroll compressor 1 of the present embodiment.
  As described above, the scroll compressor according to the present invention is suitable for improving the strength of the fixed scroll and suppressing the deterioration of the compression performance.
1 Scroll compressor 3 Fixed scroll 31 Fixed end plate (end plate)
32 Fixed side wall (wall)
33 discharge hole 34 outer wall 35 recess 36 fluid passage 36a side wall surface 4 orbiting scroll 41 movable side end plate (end plate)
42 Movable side wall (wall)
A Opening width of fluid passage B Opening width of suction port O Center of basic circle P Compression chamber S Center line T Tangent line of outer edge of wall

Claims (7)

  1. A pair of fluids having a spiral wall provided on the inner surface of the end plate, an outer wall provided integrally with the end plate so as to surround the wall, and penetrating into and out of the outer wall In a scroll compressor comprising a fixed scroll provided with a passage,
    The fluid passage is disposed such that a center line thereof deviates from a center circle of the involute in the wall body , and the fluid passage is directed toward the suction port of the compression chamber formed by the wall body. Further, the scroll compressor is characterized in that a side wall surface of the fluid passage is formed to extend toward a suction port side of the compression chamber .
  2. The scroll compressor according to claim 1 , wherein the opposing side wall surfaces of the fluid passage are provided in parallel.
  3. The scroll compressor according to claim 1 or 2 , wherein each center line of each fluid passage is provided in parallel.
  4. The scroll compressor according to any one of claims 1 to 3 , wherein a center line of the fluid passage is provided in parallel to a tangent of an outer end portion of the wall body.
  5. Scroll compressor according to any one of the claims 1 to an interval of the opposing side wall surface of the fluid passage, characterized in that wider toward the inside of the outer wall, 3,4.
  6. The scroll compressor according to any one of claims 1-5, characterized in that to form the opening width of the fluid path larger than the opening width of the suction port of the compression chamber formed by the wall.
  7. The scroll compressor according to any one of claims 1 to 6 , wherein carbon dioxide is used as a fluid to be compressed.
JP2010229779A 2010-10-12 2010-10-12 Scroll compressor Active JP5622514B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2010229779A JP5622514B2 (en) 2010-10-12 2010-10-12 Scroll compressor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010229779A JP5622514B2 (en) 2010-10-12 2010-10-12 Scroll compressor
EP11184562.4A EP2441959B1 (en) 2010-10-12 2011-10-10 Scroll compressor

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JP2012082754A JP2012082754A (en) 2012-04-26
JP5622514B2 true JP5622514B2 (en) 2014-11-12

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6116333B2 (en) * 2013-04-22 2017-04-19 三菱電機株式会社 Scroll compressor

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR890000052B1 (en) * 1985-05-16 1989-03-06 미쓰비시전기 주식회사 Scroll-type fluid transfering machine with intake port and second intake passage
JPH07269474A (en) * 1994-03-29 1995-10-17 Sanyo Electric Co Ltd Enclosed compressor
US6364643B1 (en) * 2000-11-10 2002-04-02 Scroll Technologies Scroll compressor with dual suction passages which merge into suction path
JP2005240636A (en) * 2004-02-25 2005-09-08 Mitsubishi Heavy Ind Ltd Horizontal scroll compressor
US20060245967A1 (en) * 2005-05-02 2006-11-02 Anil Gopinathan Suction baffle for scroll compressors
JP4813938B2 (en) 2006-03-20 2011-11-09 三菱重工業株式会社 Scroll compressor
JP2008002287A (en) * 2006-06-20 2008-01-10 Matsushita Electric Ind Co Ltd Scroll compressor
JP2010048226A (en) * 2008-08-25 2010-03-04 Sanden Corp Scroll type fluid machine

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JP2012082754A (en) 2012-04-26
EP2441959A1 (en) 2012-04-18

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