JP6000228B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor.

  A typical scroll compressor has a compression mechanism in an airtight container or shell. The compression mechanism of the scroll compressor includes a fixed scroll and a swing scroll each having a plate-like spiral tooth on a base plate, a frame provided with a stationary base, and an Oldham mechanism that prevents the swing scroll from rotating. . The fixed scroll and the orbiting scroll are combined so that the respective plate-like spiral teeth mesh with each other to form a plurality of compression chambers for compressing the refrigerant gas. The orbiting scroll is held by a fixed scroll and a frame. The orbiting scroll performs an orbiting motion through a thrust bearing provided on the back surface of the frame by a driving force transmitted from an orbiting shaft supported by the frame. The frame that supports the swing shaft is fixed to the hermetic container.

  The Oldham mechanism has an Oldham ring and two pairs of Oldham keys provided on the Oldham ring. A pair of Oldham keys of the Oldham ring is inserted into an Oldham guide groove formed in a member directly fastened to the sealed container or a member that does not rotate with respect to the fixed scroll by some other method, and slides in one direction. It is free to move. Another pair of Oldham keys of the Oldham ring is inserted into an Oldham guide groove provided in the orbiting scroll, and is slidable in a direction perpendicular to the one direction. With this configuration, the swinging scroll can perform a swinging motion without rotating.

  By the way, in a large-capacity scroll compressor, it is necessary to secure a large compression chamber, so that the outer diameter of the orbiting scroll inevitably increases. When the Oldham guide groove on the fixed side is provided on the fixed scroll, the Oldham guide groove must be arranged radially outside the compression chamber so that the Oldham guide groove and the compression chamber do not interfere with each other. The diameter of must also be increased. In a large scroll compressor, the rotation torque acting on the orbiting scroll increases due to the load generated by the gas compressed in the compression chamber. Since the rotation torque is generated at the center of rotation, by providing the Oldham key that receives the rotation torque on the outer peripheral side as much as possible, the rotation torque received by the Oldham key can be reduced, and the reliability of the Oldham mechanism can be improved.

  Patent Document 1 (FIGS. 3 and 4 and the like) describes a scroll compressor in which an Oldham key is provided on the outer peripheral side. In this scroll compressor, the Oldham groove is extended to the outer peripheral side by providing a relief portion on the outer peripheral portion of the frame. Thereby, the Oldham key can be arranged on the outer peripheral side while maintaining the outer diameter of the compressor.

JP2011-149339A

  In the scroll compressor described in Patent Document 1, a main bearing that supports the main shaft is provided on the inner periphery of the frame. For this reason, if a thin portion is formed on the outer peripheral portion of the frame by providing the relief portion, the frame is likely to be distorted or tilted by vibration during operation or force acting on the frame. Accordingly, there is a problem that the bearing reliability of the main bearing is lowered.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a scroll compressor that can suppress a decrease in bearing reliability while maintaining the reliability of the Oldham mechanism. To do.

A scroll compressor according to the present invention includes a sealed container, a fixed scroll and a swing scroll provided in the sealed container, a main shaft that drives the swing scroll to pivot, and a compliant that supports the main shaft in a radial direction. A frame, a guide frame that supports the compliant frame in a radial direction, and is disposed between the swing scroll and the compliant frame, and is accommodated in the guide frame; An Oldham mechanism for preventing the rotation of the orbiting scroll, and the Oldham mechanism protrudes from one side of the ring portion and the ring portion, and is provided in an Oldham guide groove formed in the fixed scroll. A fixed-side key portion that is slidably engaged in a reciprocating manner, and is provided to protrude from the one surface side of the ring portion, And swinging keys for engaging reciprocally slide in Oldham guide groove formed in the orbiting scroll has a said stationary key part is placed radially outwardly from the ring portion In the inner peripheral surface of the guide frame, an escape portion that is not brought into contact with the fixed side key portion is provided at a position facing the fixed side key portion.

  According to the present invention, by rotating the fixed-side key portion radially outward, the rotation torque received by the fixed-side key portion can be reduced, and the reliability of the Oldham mechanism can be improved.

  Further, according to the present invention, since the guide frame provided with the relief portion and the compliant frame supporting the main shaft in the radial direction are divided into separate parts, the strength of the guide frame is increased by providing the relief portion. Even if it falls, it can prevent that a distortion and inclination arise in a compliant frame. Therefore, a decrease in bearing reliability can be suppressed.

It is a longitudinal cross-sectional view which shows the structure of the scroll compressor used as the premise of Embodiment 1 of this invention. It is a partial top view which shows the structure of the general current Oldham mechanism and guide frame. It is a top view which shows the structure of the Oldham mechanism and guide frame of the scroll compressor which concerns on Embodiment 1 of this invention.

Embodiment 1 FIG.
A scroll compressor according to Embodiment 1 of the present invention will be described. FIG. 1 is a longitudinal sectional view showing a configuration of a scroll compressor 100 which is a premise of the present embodiment. The scroll compressor 100 is a high-pressure shell type scroll compressor equipped with a compliant frame mechanism. Moreover, the scroll compressor 100 becomes one of the components of the refrigerating cycle apparatus used for uses, such as a refrigerator, a freezer, a vending machine, an air conditioning apparatus, a freezing apparatus, or a hot-water supply apparatus, for example. In the following drawings including FIG. 1, the dimensional relationship and shape of each component may differ from the actual ones.

  The scroll compressor 100 has a sealed container 10 that is a high-pressure container. In the sealed container 10, a fixed scroll 1 fixed to the sealed container 10 and a swing scroll 2 provided so as to be swingable with respect to the fixed scroll 1 and constituting a compression mechanism together with the fixed scroll 1. A main shaft 6 for driving the orbiting scroll 2 to turn, a compliant frame 3 that supports the main shaft 6 in the radial direction and is movable in the axial direction with respect to the sealed container 10, and a compliant frame 3. Oldham is supported between the guide frame 4 fixed to the sealed container 10 and provided between the swing scroll 2 and the compliant frame 3 and prevents the swing scroll 2 from rotating. A mechanism 9 and an electric motor 5 that rotationally drives the main shaft 6 are accommodated. The scroll compressor 100 has a suction pipe 11 that sucks low-pressure refrigerant gas from the upstream side of the refrigerant circuit and introduces it into the compression chamber, and is compressed in the compression chamber and discharged into the sealed container 10 from the discharge port 1d. And a discharge pipe 12 for discharging the high-pressure refrigerant gas to the downstream side of the refrigerant circuit.

  The outer peripheral portion of the fixed scroll 1 is fastened to the outer peripheral portion (the outer peripheral cylindrical portion 4 e) of the guide frame 4 fixed to the sealed container 10 by a bolt (not shown). A plate-like spiral tooth 1b is formed on one surface (the lower surface in FIG. 1) of the base plate portion 1a of the fixed scroll 1. In addition, a pair of Oldham guide grooves 1c is formed in a substantially straight line on the outer peripheral portion of the one surface. In each Oldham guide groove 1c, a pair of two fixed-side key portions 9a formed on one surface (upper surface in FIG. 1) of the ring portion 9c of the Oldham mechanism 9 are engaged with each other so as to be reciprocally slidable. Yes.

  A plate-like spiral tooth 2 b having the same shape as the plate-like spiral tooth 1 b of the fixed scroll 1 is formed on one surface (the upper surface in FIG. 1) of the base plate portion 2 a of the swing scroll 2. The plate-like spiral teeth 1b of the fixed scroll 1 and the plate-like spiral teeth 2b of the swing scroll 2 are combined so as to mesh with each other. Thereby, the some compression chamber which compresses refrigerant gas is formed, and each compression chamber is separated by the plate-shaped spiral tooth 1b or the plate-shaped spiral tooth 2b.

  A hollow cylindrical boss 2d is formed at the center of the surface (the lower surface in FIG. 1) opposite to the surface on which the plate-like spiral teeth 2b are formed in the base plate 2a. A rocking bearing 2e is provided on the inner surface of the boss portion 2d. A thrust surface 2f is formed on the outer peripheral portion of the surface on the same side as the boss portion 2d. The thrust surface 2f is slidable against the thrust bearing 3a of the compliant frame 3. A pair of Oldhams having a phase difference of approximately 90 degrees with the Oldham guide groove 1c of the fixed scroll 1 is provided on the outer peripheral portion (radially outward of the thrust surface 2f) of the base plate portion 2a of the orbiting scroll 2. The guide groove 2c is formed on a substantially straight line. Each Oldham guide groove 2c is engaged with a pair of swinging key portions 9b formed on one surface (the upper surface in FIG. 1) of the Oldham mechanism 9 so as to be reciprocally slidable. With the Oldham mechanism 9 configured as described above, the orbiting scroll 2 can perform an orbiting motion (turning motion) without rotating.

  The base plate 2a of the orbiting scroll 2 communicates with the compression chamber on the surface on the fixed scroll 1 side (upper surface in FIG. 1) and the surface on the compliant frame 3 side (lower surface in FIG. 1). The extraction hole 2g which is a thin hole to be formed is formed. The opening of the bleed hole 2g on the side of the compliant frame 3, that is, the lower opening 2h is arranged so that the circular locus always fits inside the thrust bearing 3a of the compliant frame 3 during normal operation. Yes.

  On the outside of the thrust bearing 3a of the compliant frame 3, a sliding surface 3b is formed on which the ring portion 9c of the Oldham mechanism 9 reciprocates. At the center of the compliant frame 3, a main bearing 3c and an auxiliary main bearing 3d that support the main shaft 6 that is rotationally driven by the electric motor 5 in the radial direction are provided.

  The compliant frame 3 is formed with a communication hole 3e that communicates from the thrust bearing 3a to the frame lower space 4b at a position facing the lower opening 2h of the orbiting scroll 2. Further, the sliding surface 3b of the compliant frame 3 is formed with a communication hole 3f communicating with the base plate outer space 2k and the frame upper space 4a so as to communicate with the inside of the ring portion 9c of the Oldham mechanism 9. Yes. Further, the compliant frame 3 is provided with an intermediate pressure adjusting valve space 3n for accommodating an intermediate pressure adjusting valve 3g for adjusting the pressure of the boss outer space 2n, an intermediate pressure adjusting valve presser 3h, and an intermediate pressure adjusting spring 3k. It has been. The intermediate pressure adjusting spring 3k is retracted from the natural length and stored. The boss portion outer space 2 n is a compliant frame space surrounded by the outer peripheral surface of the boss portion 2 d of the swing scroll 2, the base plate portion 2 a surface, the outer surface of the main shaft 6, and the inner surface of the compliant frame 3.

  The compliant frame 3 is accommodated in the guide frame 4 so as to be movable in the axial direction due to a pressure difference. An upper fitting cylindrical surface 4c is formed on the inner side surface of the guide frame 4 on the fixed scroll 1 side (upper side in FIG. 1). The upper fitting cylindrical surface 4 c is engaged with an upper fitting surface 3 p formed on the outer peripheral surface of the compliant frame 3. On the other hand, a lower fitting cylindrical surface 4 d is formed on the inner surface of the guide frame 4 on the electric motor side (lower side in FIG. 1). The lower fitting cylindrical surface 4 d is engaged with a lower fitting cylindrical surface 3 s formed on the outer peripheral surface of the compliant frame 3.

  A frame lower space 4b formed by the inner side surface of the guide frame 4 and the outer side surface of the compliant frame 3 is partitioned by an upper ring-shaped sealing material 7a and a lower ring-shaped sealing material 7b. Here, ring-shaped seal grooves for accommodating the upper ring-shaped seal material 7a and the lower ring-shaped seal material 7b are formed at two locations on the outer peripheral surface of the compliant frame 3, and these seal grooves are formed in the guide frame 4. It may be formed on the inner peripheral surface. The space on the outer peripheral side of the thrust bearing 3a surrounded by the base plate part 2a of the orbiting scroll 2 and the compliant frame 3, that is, the base plate outer peripheral part space 2k, is a low pressure space of the intake gas atmosphere (intake pressure). It has become.

  At the end of the main shaft 6 on the side of the orbiting scroll 2 (upper side in FIG. 1), an orbiting shaft portion 6a that is rotatably engaged with the orbiting bearing 2e of the orbiting scroll 2 is formed. Further, a main shaft portion 6b that is rotatably engaged with the main bearing 3c and the auxiliary main bearing 3d of the compliant frame 3 is formed below the swing shaft portion 6a of the main shaft 6. Further, the other end portion (lower end portion in FIG. 1) of the main shaft 6 is formed with a sub shaft portion 6 c that is rotatably engaged with the sub bearing 8 a of the sub frame 8. An electric motor rotor 5a is attached between the auxiliary shaft portion 6c and the main shaft portion 6b of the main shaft 6 by shrink fitting. In addition, an oil sump for storing the refrigerating machine oil 13 is provided at the bottom of the sealed container 10. The refrigeration oil 13 in the sump is sucked up from the lower end surface of the main shaft 6, that is, the oil supply port 6 d by the oil supply mechanism provided on the main shaft 6, and supplied to each sliding portion of the scroll compressor 100.

  FIG. 2 is a partial plan view showing the configuration of a typical current Oldham mechanism and guide frame. As shown in FIG. 2, the Oldham mechanism 9 includes, for example, an annular ring portion 9c, a pair of fixed side key portions 9a (only one fixed side key portion 9a is shown in FIG. 2), and a pair of swinging portions. And a moving key portion 9b (not shown in FIG. 2). The pair of fixed-side key portions 9a and the pair of swing-side key portions 9b are formed so as to protrude from the upper surface side (the swing scroll 2 side) of the ring portion 9c. The Oldham mechanism 9 is accommodated in the outer peripheral cylindrical portion 4 e of the guide frame 4 that is in close contact with the inner peripheral surface of the sealed container 10. The Oldham mechanism 9 moves in one direction on the sliding surface (sliding surface 3b of the compliant frame 3) in accordance with the turning motion of the orbiting scroll 2 (the arrangement direction of the fixed-side key portions 9a. In FIG. 2, the horizontal direction). Slides back and forth. Therefore, the outer diameter of the Oldham mechanism 9 is regulated by the inner diameter of the outer cylindrical portion 4e (more precisely, a value obtained by subtracting the length of the reciprocating sliding range of the Oldham mechanism 9 from the inner diameter of the outer cylindrical portion 4e).

  Further, the orbiting scroll 2 is disposed between the pair of fixed side key portions 9 a of the Oldham mechanism 9. Therefore, the outer diameter of the orbiting scroll 2 is regulated by the inner diameter (the interval between the pair of fixed-side key portions 9a) D1 of the Oldham mechanism 9. In the configuration shown in FIG. 2, the dimension D1 that is the maximum outer diameter of the orbiting scroll 2 is from the inner diameter of the sealed container 10 (≈the outer diameter of the outer peripheral cylindrical portion 4e) to the inner surface of one fixed-side key portion 9a. Is a value obtained by subtracting the distance L1 from the outer peripheral surface of the outer peripheral cylindrical portion 4e and the distance (not shown) from the inner surface of the other fixed side key portion 9a to the outer peripheral surface of the outer peripheral cylindrical portion 4e.

  FIG. 3 is a plan view showing the configuration of the Oldham mechanism and guide frame of the scroll compressor according to the present embodiment. FIG. 3 shows a state where the Oldham mechanism 9 is located on one end side (the right end side in FIG. 3) of the reciprocating sliding range. As shown in FIG. 3, the Oldham mechanism 9 has, for example, an annular ring portion 9c, a pair of fixed side key portions 9a, and a pair of swing side key portions 9b. The pair of fixed-side key portions 9a and the pair of swing-side key portions 9b are formed so as to protrude from the upper surface side (the swing scroll 2 side) of the ring portion 9c. The fixed-side key portion 9a is slidably engaged with the Oldham guide groove 1c formed in the fixed scroll 1, and the swing-side key portion 9b is connected to the Oldham guide groove 2c formed in the swing scroll 2. Are slidably engaged with each other. The fixed-side key portion 9a is disposed so as to be shifted radially outward from the ring portion 9c. In the present embodiment, at least a part (for example, the whole) of the fixed side key portion 9a is an outer diameter line (in FIG. 3) indicating the outer diameter of the ring portion 9c other than the portion where the fixed side key portion 9a is formed. It is located outside the broken line). On the other hand, the swing side key portion 9b is disposed on the ring portion 9c. For this reason, the interval D2 between the two fixed-side key portions 9a is wider than the interval between the two swing-side key portions 9b.

  A pair that avoids interference (contact interference) with the fixed-side key portion 9a when the Oldham mechanism 9 is reciprocally slid on the inner peripheral surface of the outer peripheral cylindrical portion 4e of the guide frame 4 at a position facing the fixed-side key portion 9a. The relief portion 4f (concave portion) is provided. The thickness of the outer cylindrical portion 4e at the portion where the escape portion 4f is provided is thinner than the thickness of the outer cylindrical portion 4e at the other portion.

  In the configuration of the present embodiment, the distances L2 and L3 from the inner side surface of the fixed side key portion 9a to the outer peripheral surface of the outer peripheral cylindrical portion 4e are shifted in FIG. 2 by shifting the fixed side key portion 9a radially outward. Each can be smaller than the current configuration shown. Thereby, dimension D2 used as the maximum value of the outer diameter of rocking scroll 2 can be made larger than dimension D1. Therefore, the outer diameter of the orbiting scroll 2 can be increased while maintaining the outer diameter of the scroll compressor 100, and the capacity of the compression chamber can be increased. Further, by shifting the fixed-side key portion 9a outward in the radial direction, the rotational torque received by the fixed-side key portion 9a can be reduced, and the reliability of the Oldham mechanism 9 can be improved.

  In the configuration of the present embodiment, the guide frame 4 provided with the relief portion 4f and the compliant frame 3 provided with the main bearing 3c are divided into separate parts that are not fixed to each other. Therefore, even if the strength of the guide frame 4 is reduced by providing the relief portion 4f, it is possible to prevent the compliant frame 3 provided with the main bearing 3c from being distorted or inclined. Therefore, a decrease in bearing reliability of the main bearing 3c can be suppressed.

Other embodiments.
The present invention is not limited to the above embodiment, and various modifications can be made.
For example, in the above embodiment, a vertical scroll compressor has been described as an example, but the present invention is not limited to this, and can be applied to a horizontal scroll compressor.

  In addition, the above embodiments and modifications can be implemented in combination with each other.

  DESCRIPTION OF SYMBOLS 1 Fixed scroll, 1a, 2a Base plate part, 1b, 2b Plate-like spiral tooth, 1c, 2c Oldham guide groove, 1d Discharge port, 2d oscillating scroll, 2d boss part, 2e oscillating bearing, 2f thrust surface, 2g Pore, 2h Lower opening, 2k Base plate outer space, 2n Boss outer space, 3 Compliant frame, 3a Thrust bearing, 3b Sliding surface, 3c Main bearing, 3d Auxiliary main bearing, 3e, 3f Communication hole, 3g Intermediate pressure adjustment valve, 3h Intermediate pressure adjustment valve retainer, 3k Intermediate pressure adjustment spring, 3n Intermediate pressure adjustment valve space, 3p Upper fitting surface, 3s Lower fitting cylindrical surface, 4 Guide frame, 4a Frame upper space, 4b Lower frame Space, 4c Upper fitting cylindrical surface, 4d Lower fitting cylindrical surface, 4e Outer cylindrical portion, 4f Escape portion, 5 Electric motor, 5a Electric motor rotor, 6 Main shaft, 6a Oscillation Part, 6b Main shaft part, 6c Subshaft part, 6d Filling port, 7a Upper ring-shaped sealing material, 7b Lower ring-shaped sealing material, 8 Subframe, 8a Sub bearing, 9 Oldham mechanism, 9a Fixed side key part, 9b Oscillation Side key part, 9c ring part, 10 airtight container, 11 suction pipe, 12 discharge pipe, 13 refrigerating machine oil, 100 scroll compressor.

Claims (3)

A sealed container;
A fixed scroll and an orbiting scroll provided in the sealed container;
A spindle for orbiting the swing scroll;
A compliant frame that radially supports the main shaft;
A guide frame that supports the compliant frame in a radial direction and is fixed to the sealed container;
An Oldham mechanism disposed between the swing scroll and the compliant frame and housed in the guide frame to prevent the swing scroll from rotating,
The Oldham mechanism includes a ring portion, a fixed-side key portion that protrudes from one surface of the ring portion and engages with an Oldham guide groove formed in the fixed scroll so as to be slidable back and forth, and the ring An oscillating side key portion that protrudes from the one surface side of the oscillating portion and engages with an Oldham guide groove formed in the oscillating scroll so as to be slidable in a reciprocating manner.
The fixed side key portion is disposed radially outward from the ring portion,
A scroll compressor characterized in that an escape portion that is not brought into contact with the fixed-side key portion is provided at a position facing the fixed-side key portion on the inner peripheral surface of the guide frame.   The scroll compressor according to claim 1, wherein the swing side key part is disposed on the ring part. 3. The scroll compressor according to claim 1, wherein the fixed-side key portion is disposed radially outside the outer periphery of the ring portion.

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