JP6161407B2 - Scroll fluid machinery - Google Patents

Description

  The present invention sucks fluid by changing the volume of the space defined by the drive scroll and the driven scroll that rotates with the rotation of the drive scroll and performs a turning motion relative to the drive scroll. In particular, the present invention relates to a scroll fluid machine for discharging.

  Patent Document 1 (Japanese Patent Laid-Open No. 11-148470) has an object to reduce deformation of a fixed scroll in a scroll type fluid machine, and a movable scroll is supported by a frame in a casing so as to be slidable. The fixed scroll formed with the fixed scroll teeth that are vertically contacted with the movable scroll teeth formed on the movable scroll is fixedly arranged on the frame, and a thick part is formed so as to surround the discharge hole of the fixed scroll, Disclosed is a scroll fluid machine in which rear side ribs are formed from a thick part toward an outer peripheral part.

  Patent Document 2 (Japanese Patent Laid-Open No. 2006-283751) discloses a scroll compressor that blocks refrigerant gas that is heated inside a compressor or that contains a large amount of gas or oil scattered from an instrument part from flowing into a compression chamber. In order to provide a fixed scroll, an involute wrap is formed on the bottom surface of the scroll body, a compression chamber is formed inside, a flange portion is formed around the outside of the wrap, and a main portion is formed on the bottom surface of the flange portion. A plurality of legs are formed to be coupled to the upper surface of the frame, and includes a blocking guide portion that guides the suction gas flowing from the lower surface of the flange portion to the tip of the wrap and flows into the compression chamber. A first barrier wall integrally formed between the outer surface of the wrap corresponding to the tip and the inner side surface of the leg, and a second barrier wall integrally formed between the outer surface of the lap and the inner surface of the leg. Made is, first, the reinforcing ribs between the inner surface and the outer surface of the wrap of the leg portion which is not formed in the second barrier walls is intended to be integrally formed.

JP 11-148470 A JP 2006-283951 A

  Conventionally, a driving scroll and a rotating motion relative to the driving scroll rotate with the rotation of the driving scroll, and the volume of the space defined by the driving scroll and the driven scroll is changed. In a scroll fluid machine that sucks and discharges, that is, a so-called full-rotation type scroll fluid machine, a large centrifugal force acts on the outermost peripheral ends of the laps of the driving scroll and the driven scroll, and measures for deformation of the lap are required. For this reason, measures such as increasing the plate thickness, lowering the lap height, and lowering the rotation speed are possible, but there are disadvantages such as capacity reduction and weight increase, It becomes increasingly difficult to respond. Furthermore, since a large thrust pressure that attempts to separate the driving scroll and the driven scroll in the axial direction by the internally generated pressure acts on the respective bearings that are supported, problems such as bearing durability and power increase have occurred.

  In the structure disclosed in Patent Document 1, in the wrapping of the fixed scroll that does not rotate, the fastening portion and the fixed scroll tooth that are formed on the surface opposite to the side on which the first rib portion is formed are connected. A second rib portion is formed. Even in the structure disclosed in Patent Document 2, the first shielding wall and the second shielding wall are continuously provided between the wrap and the leg portion of the fixed scroll that does not rotate, and the inner side surface of the leg portion and the outside of the wrap. Reinforcing ribs are integrally formed between the side surfaces. As described above, in the conventional scroll fluid machine, the wrap of the fixed scroll that does not rotate can be easily reinforced. In addition, since it does not rotate, centrifugal force does not act, and the outermost peripheral part becomes a suction part and pressure by compressed gas does not act, so reinforcement of the outermost peripheral part is mainly for deformation prevention during processing, etc. The method can be used, and there is not much merit in taking measures to increase the strength of the outermost periphery. Since the orbiting scroll is orbiting, the centrifugal force only acts on the orbiting radius, and it has almost no effect because it is as small as a few tenths compared to the full rotation type. However, in a full-rotation type scroll fluid machine in which the scrolls (drive scroll and driven scroll) constituting the compression chamber rotate together, the centrifugal force due to the rotation is proportional to the distance to the outermost periphery of the lap, so the centrifugal force is very However, further contrivance is required to reinforce the wrap.

  Therefore, an object of the present invention is to provide a scroll fluid machine that doubles as a wrap, cancels the thrust pressure, has a structure that does not act on the bearing, and adjusts the problems associated with each part.

Accordingly, the present invention provides a housing, a pair of rotating shafts rotatably supported by the housing, and a pair of driving scroll members fixed to the pair of rotating shafts and arranged to face each other. A driven scroll member that is slidably sandwiched between the pair of scroll members, and a driven scroll receiver that rotatably supports the driven scroll member on the housing and is eccentric to the rotating shaft. Each of the drive scroll members includes a disk-shaped drive unit end plate fixed to the rotating shaft, and a pair of drive side wrap portions that are spirally spread in the radial direction on the drive unit end plate and arranged point-symmetrically. The driven scroll member includes a disk-shaped driven part end plate and a pair of driven side lasers that are spirally spread in the radial direction on both sides of the driven part end plate and arranged symmetrically. The driven scroll member is sandwiched between a pair of driving scroll members, a compression chamber is defined on both sides of the driven unit end plate, and a rotating shaft is rotated by external power to drive the driven scroll member. In the scroll fluid machine that rotates the driven scroll member and simultaneously rotates the driven scroll member relative to the driving scroll member via the Oldham mechanism to change the compression chamber to suck and discharge the fluid. The driving scroll member is connected to each other by a central boss portion and four outer peripheral edge boss portions arranged at predetermined intervals on the outer peripheral edge of the driving portion end plate, and the central end portion of the driving side wrap portion Are connected to the central boss portion, and the outer peripheral side end portions of the pair of drive side wrap portions are respectively connected to the outer peripheral boss portion, and the remaining outer peripheral boss portions Respectively connected to the driving side wrap part in the vicinity to reinforce the driving side wrap, the driven scroll member has the central boss part and the outer peripheral boss part at positions corresponding to the central boss part and the outer peripheral boss part. The through hole has a size that allows the inner pipes provided in the central boss portion and the outer peripheral boss portion to pivot, and each boss portion of the drive scroll member is pivoted. The driven scroll member has a space that does not interfere with the driven scroll member , and the driven scroll member includes an outer peripheral cylindrical portion that extends in the axial direction on the outer peripheral edge of the driven portion end plate, and the outermost peripheral end portion of the driven side wrap portion is It is to be reinforced by being connected to the outer peripheral cylindrical portion.

  As a result, the drive-side wrap portion of the drive scroll member is reinforced by the central boss portion and the outer peripheral boss portion, and at the same time, the pair of opposed boss portions are connected and fixed, so that both ends are fixed. Further, since the reinforcement is further reinforced and the driven wrap is also connected to the outer cylindrical portion and reinforced, deformation of the wrap can be prevented even when rotating at high speed. Furthermore, by connecting and fixing a pair of opposing bosses of the drive scroll to the thrust direction pressure generated inside, by receiving this pressure with the strength of the boss part, the generated thrust pressure is offset and the load on the bearing is reduced. It has a structure that does not hang. In particular, since it is possible to connect and fix not only at the outer peripheral portion but also at the central portion, even when the size is increased, the thrust pressure can be evenly offset.

  Further, the central boss portion and the outer peripheral boss portion connecting the pair of driving scroll members have a predetermined length for making the interval between the corresponding central boss portion and outer peripheral boss portion connected correspondingly constant. It is desirable to be connected and fixed via the inner pipe.

  Thereby, even when the center boss part and the outer peripheral edge boss part of the pair of driving scroll members are fixed by screws or the like, a gap that can hold the driven scroll member rotatably can be easily formed.

  Furthermore, a discharge hole passes through one of the rotating shafts, and the discharge hole communicates with an exhaust port that opens at the center of the driven scroll member. It is desirable to make it a discharge hole having an opening through which a part of the central boss is cut and penetrated.

  As a result, it is possible to form a large discharge space that is constrained by the boss formed at the center of the drive side, and to prevent pressure loss that occurs between the final stage of the compression chamber and the discharge hole. is there. Furthermore, even if a part of the central boss portion is deleted to secure the discharge space, it is possible to cancel the thrust direction pressure without any problem in strength.

  According to the present invention, since the driving side wrap portion of the driving scroll member and the driven side wrap portion of the driven scroll member are reinforced, the rotation speed of the scroll fluid machine can be increased, and thus the discharge capacity is improved. Can do. Furthermore, since the tip relief groove of the central boss part and the discharge opening through the end plate are formed, the pressure loss of the fluid on the discharge side can be reduced, so that the discharge performance can be further improved. In addition, by connecting and fixing a pair of opposing bosses of the drive scroll to the thrust direction pressure generated inside, by receiving the pressure with the strength of the boss part, the generated thrust pressure is offset and the load on the bearing In particular, the thrust pressure can be evenly offset even when the size is increased by adopting a structure that does not hang, and in particular by being able to be connected and fixed not only at the outer periphery but also at the center.

FIG. 1 is a cross-sectional view of a scroll fluid machine according to an embodiment of the present invention. (A) is a perspective view which shows one drive scroll member of the scroll fluid machine based on the Example of this invention, (b) is the top view. (A) is a perspective view which shows the drive scroll member of the other side of the scroll fluid machine based on the Example of this invention, (b) is the top view. (A) is a perspective view which shows the driven scroll member of the scroll fluid machine based on the Example of this invention, (b) is the top view. It is explanatory drawing which showed the connection state of the drive scroll member.

  Embodiments of the present invention will be described below with reference to the drawings.

  A scroll fluid machine 1 according to the present invention includes a housing 2, first and second rotating shafts 3 and 4 that are rotatably supported by the housing, and first and second rotating shafts 3 and 4. First and second driving scroll members 5, 6 fixed to each other and arranged to face each other, and a driven scroll slidably held between the first and second driving scroll members 5, 6 A member 7 and first and second driven scroll receivers 9 and 10 for supporting the driven scroll member 7 rotatably on the housing 2 and eccentrically supporting the rotating shafts 3 and 4 are provided. The rotary shafts 3 and 4 are rotatably supported by the housing 2 via the bearings 3A and 4A, and the driven scroll receivers 9 and 10 are rotatably supported by the housing 2 via the bearings 9A and 10A.

  The first drive scroll member 5 is shown in FIGS. 2A and 2B, and includes a disc-shaped end plate 5A fixed to the first rotating shaft 3, and a central boss portion 5B of the end plate 5A. First and second drive side wrap portions 5C and 5D are provided that extend in a radially outward manner in a spiral shape. The outermost peripheral ends of the first and second drive side wrap portions 5C, 5D are connected to the first and second outer peripheral boss portions 5E, 5F located at the outer peripheral portion of the end plate 5A, and the drive A substantially middle portion of the outermost peripheral portions of the side wrap portions 5C and 5D is connected to the third and fourth outer peripheral boss portions 5G and 5H, and the outer peripheral portions of the drive side wrap portions 5C and 5D are reinforced. is there. Further, the driving side wrap portions 5C and 5D are arranged in a point-symmetrical manner with the central boss portion 5B as the center. Further, the central boss portion 5B and the first to fourth outer peripheral edge boss portions 5E, 5F, 5G, 5H are formed at the same height as the first and second drive side wrap portions 5C, 5D, and the end plate It is formed on the outer peripheral edge of 5A every central angle of 90 °. Furthermore, an escape groove 5J is formed around the central boss portion 5B. Further, the rotary shaft 3 is formed with a discharge hole 3B as shown in FIG. 1, and further, an opening 3C is formed in which the discharge hole 3B opens to the final stage 11A of the compression chamber 11 described below. .

  The second drive scroll member 6 is shown in FIGS. 3A and 3B, and includes a disc-shaped end plate 6A fixed to the second rotating shaft 4 and a central boss portion 6B of the end plate 6A. Third and fourth drive side wrap portions 6C, 6D are provided that extend in the radial direction in a spiral manner. The outermost peripheral ends of the third and fourth drive side wrap portions 6C, 6D are connected to the first and second outer peripheral boss portions 6E, 6F located at the outer peripheral portion of the end plate 6A, and the drive The substantially middle part of the outermost peripheral portions of the side wrap portions 6C, 6D is connected to the third and fourth outer peripheral boss portions 6G, 6H, and the outer peripheral portions of the third and fourth drive side wrap portions 6C, 6D. Is reinforced. The third and fourth drive side wrap portions 6C and 6D are arranged in a point-symmetric manner with the central boss portion 6B as the center. Further, the central boss portion 6B and the outer peripheral edge boss portions 6E, 6F, 6G, 6H are formed at the same height as the third and fourth driving side wrap portions 6C, 6D, and are formed on the outer peripheral edge portion of the end plate 6A. , Formed at every 90 ° central angle. Furthermore, an escape groove 6J is formed around the central boss portion 6B.

  The driven scroll member 7 includes a disk-shaped driven portion end plate 7A and outer peripheral cylindrical portions 7B and 7C extending on both sides in the axial direction on the outer peripheral edge portion of the driven portion end plate 7A. A central through hole 7D is provided at the center. The central through hole 7D is configured such that the central boss portions 5B and 6B are inserted through the inner tube 30 so as to be rotatable. In addition, the first through fourth outer peripheral boss portions 5E to 5H and 6E to 6H connected to face each other on the follower end plate 7A are inserted through the inner tube 30 so as to be rotatable. Holes 7E, 7F, 7G, and 7H are formed. Further, first and second driven side wrap portions 7J and 7K extending spirally outward in the radial direction from the peripheral edge of the central through hole 7D are point-symmetric on one side surface of the driven portion end plate 7A. Similarly, third and fourth driven side wrap portions 7L and 7M that spirally extend radially outward from the peripheral edge of the central through hole 7D are formed point-symmetrically on the other side surface. .

  As a result, in the space sandwiched between the first driving unit end plate 5A and the driven unit end plate 7A, the first and second driving side wrap portions 5C, 5D and the first and second driven side wrap portions 7J, 7K The first-side compression chamber (compression space) 11 is defined by meshing, and the third and fourth drive-side wrap portions are in a space sandwiched between the second drive unit end plate 6A and the driven unit end plate 7A. The second side compression chamber (compression space) 12 is defined by meshing 6C, 6D with the third and fourth driven side wrap portions 7L, 7M.

  In the first-side compression chamber 11 and the second-side compression chamber 12, the first and second drive scroll members 5, 6 rotate when the second rotating shaft 4 rotates by external power. Further, the first and second driven scroll members 5 and 6 are coupled to the Oldham mechanism 20 through the first and second driven scroll receivers 9 and 10 and the driven scroll member 7 is rotated and simultaneously the first and second driven scroll members 5 and 6 are rotated. The volume of the second drive scroll members 5 and 6 is reduced while moving from the outer peripheral direction to the center direction by performing a revolving motion relative to the second drive scroll members 5 and 6. As a result, fluid (gas or liquid, particularly air or water) is sucked into the housing 2 from a suction port (not shown) that opens in the housing 2, and suction that is opened in the outer peripheral cylindrical portions 7 B and 7 C of the driven scroll member 7. The first suction chamber 11 and the second compression chamber 12 are sucked and compressed from the openings 7N and 7P. The compressed fluid is discharged from the discharge hole 3B formed in the first rotating shaft 3 from the final stage 11A of the compression chamber 11 on the first side and the final stage 12A of the compression chamber 12 on the second side. It is.

  In particular, the fluid in the final stage 12A of the compression chamber 12 on the second side flows through the escape groove 6J of the second driving scroll member 6, the central through hole 7D of the driven scroll member 7, and further the first driving scroll member 5. It passes through the relief groove 5J to reach the final stage 11A of the compression chamber 11 on the first side. In this final stage 11A, together with the fluid of the final stage 11A of the compression chamber 11 on the first side, the first rotating shaft 3 and the central boss part 5B to the discharge hole 3B from the opening part 3C. In this case, the pressure loss of the whole fluid can be reduced by forming the relief grooves 5J and 6J and the opening 3C.

  In addition, the first driving scroll member 5 and the second driving scroll member 6 include the central boss portions 5B, 6B and the corresponding outer peripheral boss portions 5E, 6E, 5F, 6F, 5G, 6G and 5H, 6H, respectively. As shown in FIG. 5, it is connected via an inner tube (inner ring) of a predetermined length so that the driven part end plate 7A of the driven scroll member 7 can reliably form and hold a gap 40 that can be slidably swiveled. It is to make.

  With the above configuration, according to the scroll fluid machine of the present invention, since the outer peripheral ends of the driving side and the driven side lap can be reinforced, deformation of the lap can be prevented, so operation at high speed rotation is possible. Therefore, the discharge performance can be improved.

  Furthermore, since the relief grooves 5J and 6J around the central boss portion and the opening 3C are formed, the pressure loss of the fluid on the discharge side can be reduced, so that the discharge performance can be further improved.

  Further, since the first driving scroll member and the second scroll member are connected to each other through the inner pipe (inner ring) having a predetermined length when the corresponding boss portions are connected, the driven scroll is connected. The end plate of the member can be securely held in a slidable state. In addition, by connecting and fixing a pair of opposing bosses of the drive scroll to the thrust direction pressure generated inside, by receiving the pressure with the strength of the boss part, the generated thrust pressure is offset and the load on the bearing In particular, the thrust pressure can be evenly offset even in the case of an increase in size by adopting a structure that does not apply, and in particular by being able to be connected and fixed not only at the outer periphery but also at the center.

DESCRIPTION OF SYMBOLS 1 Scroll fluid machine 2 Housing 3 1st rotating shaft 4 2nd rotating shaft 5 1st drive scroll member 5A 1st drive part endplate 5B Central boss | hub part 5C 1st drive side lap | wrap part 5D 2nd drive side Wrap portion 5E First outer peripheral boss portion 5F Second outer peripheral boss portion 5G Third outer peripheral boss portion 5H Fourth outer peripheral boss portion 6 Second driving scroll member 6A Second driving portion end plate 6B Center Boss portion 6C Third drive side wrap portion 6D Fourth drive side wrap portion 6E First outer peripheral boss portion 6F Second outer peripheral boss portion 6G Third outer peripheral boss portion 6H Fourth outer peripheral boss portion 7 driven scroll member 7A driven part end plate 7B, 7C outer peripheral cylindrical part 7D central through hole 7E, 7F, 7G, 7H outer peripheral side through hole 7J first driven side wrap part 7K second driven side wrap part 7L third driven Side wrap M fourth major side wrap portion 9 first driven scroll received 10 second driven scroll received 11 first compression chamber 12 and the second compression chamber 20 Oldham mechanism 30 inner tube 40 clearance

Claims (3)

A housing, a pair of rotating shafts rotatably supported by the housing, a pair of driving scroll members fixed to each of the pair of rotating shafts and arranged to face each other, and the pair of scroll members A driven scroll member that is slidably held between the driven scroll member and a driven scroll receiver that supports the driven scroll member rotatably on the housing and eccentrically with respect to the rotating shaft. A disk-shaped drive part end plate fixed to the rotating shaft, and a pair of drive side wrap parts that extend spirally in the radial direction on the drive part end plate and are arranged point-symmetrically. The member includes a disk-shaped driven portion end plate and a pair of driven side wrap portions extending in a spiral shape in the radial direction on both sides of the driven portion end plate and arranged symmetrically with respect to the point. A scroll member is sandwiched between a pair of driving scroll members to define a compression chamber on both sides of the driven unit end plate, and at the same time the rotating shaft is rotated by external power to rotate the driving scroll member and the driven scroll member. In a scroll fluid machine that sucks and discharges fluid by changing the compression chamber by rotating the driven scroll member relative to the drive scroll member via the Oldham mechanism,
The pair of driving scroll members are connected to each other by a central boss part and four outer peripheral edge boss parts arranged at predetermined intervals on the outer peripheral edge of the driving part end plate,
A center side end of the drive side wrap portion is connected to the center boss portion, an outer peripheral side end portion of the pair of drive side wrap portions is connected to the outer periphery boss portion, and the remaining outer periphery boss portions are respectively Connected to the driving side wrap part in the vicinity, reinforcing the driving side wrap,
The driven scroll member has a through-hole through which the central boss portion and the outer peripheral boss portion pass, at a position corresponding to the central boss portion and the outer peripheral boss portion. The inner pipe provided in the peripheral boss part has a size that can be turned, and each boss part of the driving scroll member is formed with a space that does not interfere with the driven scroll member when turning, and
The driven scroll member includes an outer peripheral cylindrical portion extending in an axial direction on an outer peripheral edge of the driven portion end plate, and an outermost peripheral end portion of the driven side wrap portion is connected to the outer peripheral cylindrical portion and is reinforced. Scroll fluid machine.   The central boss portion and the outer peripheral boss portion connecting the pair of driving scroll members are inner pipes having a predetermined length for making the interval between the respective central boss portion and outer peripheral boss portion connected correspondingly constant. The scroll fluid machine according to claim 1, wherein the scroll fluid machine is connected and fixed via A discharge hole passes through one of the rotating shafts, and the discharge hole communicates with an exhaust port that opens at the center of the driven scroll member. At the same time, a tip escape groove and an end plate pass through the central boss portion of the drive scroll member. The scroll fluid machine according to claim 1, wherein a discharge opening is formed.

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