JP6989756B2 - Scroll compressor - Google Patents

Description

The present invention relates to a scroll compressor.

The scroll compressor has a fixed scroll and a movable scroll. To change the volume of the compression chamber, the movable scroll is revolved relative to the fixed scroll. The scroll compressor is provided with an oldham joint to prevent the movable scroll from rotating on its axis as it revolves. The key portion of the oldham joint is fitted into a guide groove provided in a movable scroll, a frame member, or the like. The key portion can move only in the longitudinal direction of the guide groove, and cannot move in any other direction. In the Oldham joint disclosed in Patent Document 1 (Japanese Unexamined Patent Publication No. 2014-202076), the width of the key portion is halved in order to suppress wear caused by pressing a specific side surface of the key portion against the surface of the guide groove. By notching the key part, elastic deformation of the key part is promoted and friction is alleviated.

If lubricating oil is supplied to the sliding surface between the key portion and the guide groove, the wear of the key portion should be further suppressed. However, the key portion of the above document cannot be said to have a structure suitable for holding the lubricating oil or supplying the lubricating oil to the sliding surface.

An object of the present invention is to suppress wear of an old dam joint that regulates the rotation of a movable scroll in a scroll compressor.

The scroll compressor according to the first aspect of the present invention includes a casing, a fixed scroll, a movable scroll, a frame member fixed to the casing, and an oldham joint that suppresses rotation while allowing the movable scroll to revolve. Be prepared. The fixed scroll or frame member is provided with a fixed guide groove. The movable scroll is provided with a movable guide groove. The oldham joint has an annular portion and a key portion. The key portion protrudes from the annular portion in at least the central axis direction, which is the extending direction of the central axis of the annular portion, and is movably arranged in the fixed guide groove or the movable guide groove. At least one surface of the key portion is provided with a recess having two opposing side walls.

According to this configuration, the recess of the key portion functions as a relay portion for supplying the lubricating oil supplied to the compression mechanism to the sliding surface of the key portion of the Oldam joint. Therefore, the supply of the lubricating oil to the sliding surface is promoted, and the wear of the key portion is suppressed.

The scroll compressor according to the second aspect of the present invention is a groove portion in which the recess is provided over the entire length in the central axis direction of the key portion in the scroll compressor according to the first aspect.

According to this configuration, the recess is provided over the entire length of the key portion. Therefore, since the key portion is easily elastically deformed when a load is applied, the wear of the key portion is further suppressed.

In the scroll compressor according to the third aspect of the present invention, in the scroll compressor according to the first aspect, the recess is provided in a part of the total length of the key portion in the central axis direction on the side of the protruding end portion of the key portion. Has been done.

According to this configuration, the recess is provided at the protruding end of the key portion. Therefore, elastic deformation of the protruding end portion to which a load is easily applied is promoted, so that wear of the key portion is further suppressed.

The scroll compressor according to the fourth aspect of the present invention is the scroll compressor according to any one of the first to third aspects, in which the key portion slides on the fixed guide groove or the movable guide groove. Has a face. At least one surface of the key portion includes the sliding surface.

According to this configuration, the recess is provided on the sliding surface. Therefore, since the lubricating oil in the recess is easily supplied to the sliding surface, the wear of the key portion is further suppressed.

In the scroll compressor according to the fifth aspect of the present invention, in the scroll compressor according to any one of the first aspect to the fourth aspect, the key portion is orthogonal to the longitudinal direction of the fixed guide groove or the movable guide groove. Has an intersection. At least one surface of the key portion includes an intersection surface.

According to this configuration, the recess is provided at the intersection. Therefore, due to the inertia that acts when the moving direction is reversed in the reciprocating motion of the key portion, the lubricating oil in the recess is thrown out from the recess and supplied to the sliding surface, so that the wear of the key portion is further suppressed.

According to the scroll compressor according to the present invention, wear of the Oldham joint is suppressed.

It is sectional drawing of the scroll compressor 10 which concerns on one Embodiment of this invention. It is a top view of the Oldham joint 80. It is a side view of the Oldham joint 80. It is a top view which shows the old dumb joint 80, the fixed guide groove 79, and the movable guide groove 69. It is a perspective view of the old dumb joint 80. It is a perspective view of the old dumb joint 80. It is a perspective view of the Oldham joint 80A of the scroll compressor 10 which concerns on the modification A of this invention. It is a perspective view of the old dam joint 80B of the scroll compressor 10 which concerns on the modification B of this invention. It is a perspective view of the Oldham joint 80C of the scroll compressor 10 which concerns on the modification C of this invention. It is a perspective view of the Oldham joint 80D of the scroll compressor 10 which concerns on the modification D of this invention. It is a perspective view of the Oldham joint 80E of the scroll compressor 10 which concerns on the modification E of this invention.

(1) Overall Configuration FIG. 1 shows a scroll compressor 10 according to an embodiment of the present invention. The scroll compressor 10 is mounted on an air conditioner or the like for compressing a refrigerant which is a fluid. The scroll compressor 10 includes a casing 20, a motor 30, a crank shaft 35, a compression mechanism 40, and frame members 70 and 75.

Various refrigerants are included in the refrigerant compressed by the scroll compressor 10. For example, the refrigerant compressed by the scroll compressor 10 contains a substance having a high condensation pressure and a high temperature and high pressure in the compression mechanism 40. When such a refrigerant is discharged from the compression mechanism 40, the discharge temperature becomes high. The refrigerant may be, for example, an R32 single refrigerant, a mixed refrigerant of R32 refrigerant and another refrigerant having a mixing ratio of R32 refrigerant of 50% or more (R410A refrigerant, R452B refrigerant, R454B refrigerant, etc.), or an R32 refrigerant. It is a mixed refrigerant of R1123 refrigerant. In particular, the refrigerant may have a higher condensation pressure and a higher discharge temperature than R410A.

(2) Detailed configuration (2-1) Casing 20
The casing 20 houses various components of the scroll compressor 10 and a refrigerant. The casing 20 can withstand the high pressure of the refrigerant. The casing 20 has a main body portion 21, an upper portion 22, and a lower portion 23 joined to each other. A suction pipe 15 for sucking the low-pressure gas refrigerant is provided in the upper portion 22. The main body 21 is provided with a discharge pipe 16 for discharging the high-pressure gas refrigerant. Lubricating oil L for lubricating sliding portions in various components is sealed in the lower portion of the casing 20.

(2-2) Motor 30
The motor 30 receives electric power to generate power for compressing the refrigerant. The motor 30 has a stator 31 and a rotor 32. The stator 31 is fixed to the main body 21 of the casing 20. The stator 31 has windings (not shown). The winding receives power and generates an alternating magnetic field. The rotor 32 is rotatably installed in the central cavity of the stator 31. A permanent magnet (not shown) is embedded in the rotor 32. When the permanent magnet receives a force from the AC magnetic field, the rotor 32 rotates to generate power.

(2-3) Crank shaft 35
The crank shaft 35 is for transmitting the power generated by the motor 30 to the compression mechanism 40. The crank shaft 35 has a spindle portion 36 and an eccentric portion 37. The spindle portion 36 is fixed so as to penetrate the rotor 32 and is concentric with the rotor 32. The eccentric portion 37 is eccentric with respect to the rotor 32 and is connected to the compression mechanism 40.

(2-4) Compression mechanism 40
The compression mechanism 40 is for compressing the low-pressure gas refrigerant to produce a high-pressure gas refrigerant. The compression mechanism 40 has a fixed scroll 50 and a movable scroll 60. The fixed scroll 50 is directly or indirectly fixed to the casing 20. The movable scroll 60 is connected to the eccentric portion 37 of the crank shaft 35 and can revolve with respect to the fixed scroll 50. The fixed scroll 50 and the movable scroll 60 define the compression chamber 41. The revolution of the movable scroll 60 changes the volume of the compression chamber 41, whereby the low-pressure gas refrigerant is compressed into a high-pressure gas refrigerant. The high-pressure gas refrigerant is discharged from the discharge port 42 to the outside of the compression mechanism 40.

(2-5) Frame members 70, 75
The frame members 70 and 75 rotatably support the crank shaft 35. One frame member 70 supports the upper part of the spindle portion 36. The other frame member 75 supports the lower part of the main shaft portion 36. The frame members 70 and 75 are directly or indirectly fixed to the casing 20.

(2-6) Oldham fitting 80
The oldham joint 80 is for suppressing the rotation while allowing the movable scroll 60 to revolve. The oldham joint 80 is provided between the movable scroll 60 and the frame member 70. The structure of the Oldham joint 80 will be described in detail below.

(3) Detailed Configuration of Oldham Joint 80 FIG. 2 is a plan view of the Oldam joint 80, and FIG. 3 is a side view of the Oldam joint 80. The oldham joint 80 has an annular portion 81, two upward projecting key portions 83, and two downward projecting key portions 84. The annular portion 81 has a shape surrounding the central axis C. The upward protruding key portion 83 projects upward from the annular portion 81. The downward protruding key portion 84 projects downward from the annular portion 81. The two upward projecting key portions 83 are arranged on opposite sides of the central axis C. The two downward projecting key portions 84 are also arranged on opposite sides of the central axis C.

As shown in FIG. 1, the frame member 70 is provided with a fixed guide groove 79. In FIG. 4, the fixed guide groove 79 is depicted so as to overlap the Oldham joint 80. The downward protruding key portion 84 is arranged so as to fit into the fixed guide groove 79, and is guided by the fixed guide groove 79. The downward protruding key portion 84 can move only in the longitudinal direction MD of the fixed guide groove 79 relative to the frame member 70.

FIG. 4 also depicts a movable guide groove 69 provided in the movable scroll 60. The upward protruding key portion 83 is arranged so as to fit into the movable guide groove 69, and is guided by the movable guide groove 69. The upward protruding key portion 83 can move only in the longitudinal direction MU of the movable guide groove 69 relative to the movable scroll 60.

FIG. 5 shows the structure of the upward protruding key portion 83 of the Oldham joint 80. As described above, the upward protruding key portion 83 projects upward from the annular portion 81 and has a protruding end portion 88. Since the upward protruding key portion 83 is guided by the movable guide groove 69, the oldam joint 80 can move only in the longitudinal direction MU of the movable guide groove 69 relative to the movable scroll 60. The upward protruding key portion 83 has a substantially rectangular parallelepiped shape, and has two sliding surfaces 86 and two intersecting surfaces 87 formed so as to surround the protruding end portion 88. The sliding surface 86 slides with the movable guide groove 69. The plane defined by the sliding surface 86 includes a longitudinal direction MU of the movable guide groove 69, that is, a straight line extending in the moving direction of the upward protruding key portion 83. The plane defined by the crossing surface 87 intersects the longitudinal direction MU of the movable guide groove 69, that is, the moving direction of the upward protruding key portion 83, and is orthogonal to each other, for example. A recess 85 is provided in one of the two intersecting surfaces 87 on the outer side of the annular portion 81. The recess 85 has two side walls 89 facing each other. The recess 85 has the form of a groove extending over the entire length H in the extending direction of the central axis C of the upward protruding key portion 83. The width of the groove, that is, the distance between the two side walls 89 is set so that the groove can hold the lubricating oil L due to a capillary phenomenon or the like. The number of recesses 85 provided in one intersection 87 is not limited to one, and may be two or more.

FIG. 6 shows the structure of the downward protruding key portion 84 of the Oldham joint 80. The structure of the downward protruding key portion 84 is substantially the same as the structure of the upward protruding key portion 83. As described above, the downward projecting key portion 84 projects downward from the annular portion 81 and has a protruding end portion 88. Since the downward protruding key portion 84 is guided to the fixed guide groove 79, the oldham joint 80 can move only in the longitudinal direction MD of the fixed guide groove 79 relative to the frame member 70. The downward protruding key portion 84 has a substantially rectangular parallelepiped shape, and has two sliding surfaces 86 and two intersecting surfaces 87 formed so as to surround the protruding end portion 88. The sliding surface 86 slides with the fixed guide groove 79. The plane defined by the sliding surface 86 includes a longitudinal MD of the fixed guide groove 79, that is, a straight line extending in the moving direction of the downward protruding key portion 84. The plane defined by the intersecting surface 87 intersects the longitudinal direction MD of the fixed guide groove 79, that is, the moving direction of the downward protruding key portion 84, and is orthogonal to each other, for example. A recess 85 is provided in one of the two intersecting surfaces 87 on the outer side of the annular portion 81. The recess 85 has two side walls 89 facing each other. The recess 85 has the form of a groove extending over the entire length H in the extending direction of the central axis C of the downward protruding key portion 84. The width of the groove, that is, the distance between the two side walls 89 is set so that the groove can hold the lubricating oil L due to a capillary phenomenon or the like. The number of recesses 85 provided in one intersection 87 is not limited to one, and may be two or more.

(4) Operation of Scroll Compressor 10 The rotor 32 of the motor 30 shown in FIG. 1 is rotated by the electric power supplied from the outside. The rotation of the rotor 32 is transmitted to the spindle portion 36 of the crank shaft 35. The movable scroll 60 revolves with respect to the fixed scroll 50 by the power transmitted from the eccentric portion 37 of the crank shaft 35. The low-pressure gas refrigerant taken in from the suction pipe 15 enters the compression chamber 41 on the outer peripheral side of the compression mechanism 40. The compression chamber 41 moves to the center of the compression mechanism 40 while reducing the volume by the revolution of the movable scroll 60. In the process, the low-pressure gas refrigerant is compressed into a high-pressure gas refrigerant. The high-pressure gas refrigerant is discharged from the discharge port 42 to the outside of the compression mechanism 40 and moves to the space inside the casing. After that, the high-pressure gas refrigerant is discharged from the discharge pipe 16 to the outside of the casing 20.

The movable scroll 60 can move only in the longitudinal direction MU of the movable guide groove 69 relative to the Oldham joint 80. The oldham joint 80 can move only in the longitudinal direction MD of the fixed guide groove 79 relative to the frame member 70. Since the movement is restricted by the oldham joint 80, the rotation is suppressed when the movable scroll 60 revolves.

The lubricating oil L stored in the bottom of the casing 20 passes through the oil passage provided inside the crank shaft 35 due to the differential pressure between the high pressure space below the compression mechanism 40 and the compression chamber, and the compression mechanism 40 It is sucked up toward you. The lubricating oil L then lubricates sliding portions such as the fixed scroll 50, the movable scroll 60, the frame member 70, and the oldham joint 80.

When lubricating the Oldham joint 80, a part of the lubricating oil L is held in the recess 85 shown in FIGS. 5 and 6. During the reciprocating motion of the upward protruding key portion 83 and the downward protruding key portion 84, the lubricating oil L held in the recess 85 exits from the recess 85 and reaches the sliding surface 86, the movable guide groove 69, the fixed guide groove 79, and the like. do. As a result, the sliding portion is stably supplied with the lubricating oil L.

(5) Features (5-1)
The recess 85 of the upward protruding key portion 83 and the downward protruding key portion 84 is a relay portion for supplying the lubricating oil L supplied to the compression mechanism 40 to the sliding surface 86 of the upward protruding key portion 83 and the downward protruding key portion 84. Functions as. Therefore, since the supply of the lubricating oil L to the sliding surface 86 is promoted, the wear of the upward protruding key portion 83 and the downward protruding key portion 84 is suppressed.

Further, since the recess 85 capable of holding the lubricating oil L is composed of two facing side walls 89, it is not necessary to reduce a part of the sliding surface 86 in order to obtain a relay portion of the lubricating oil L. Therefore, when any of the two sliding surfaces 86 comes into contact with the fixed guide groove 79 or the movable guide groove 69, elastic deformation of the upward protruding key portion 83 or the downward protruding key portion 84 is promoted. This elastic deformation can also suppress the wear of the upward protruding key portion 83 and the downward protruding key portion 84.

(5-2)
The recess 85 is provided over the entire length H of the upward protruding key portion 83 and the downward protruding key portion 84. Therefore, since the upward protruding key portion 83 and the downward protruding key portion 84 are likely to be elastically deformed when a load is applied, the wear of the upward protruding key portion 83 and the downward protruding key portion 84 is further suppressed.

(5-3)
The recess 85 is provided on the intersection surface 87. Therefore, the lubricating oil L in the recess 85 is thrown out from the recess 85 and supplied to the sliding surface 86 due to the inertia that acts when the moving direction is reversed in the reciprocating motion of the upward protruding key portion 83 and the downward protruding key portion 84. Lubricate. As a result, wear of the upward protruding key portion 83 and the downward protruding key portion 84 is further suppressed.

(6) Modification example A modification of the present embodiment is shown below. It should be noted that a plurality of modified examples may be appropriately combined.

(6-1) Modification A
FIG. 7 shows the structure of the upward protruding key portion 83 of the Oldham joint 80A according to the modified example A. The structure of the downward protruding key portion 84 may be the same as in this figure.

Two recesses 85 are provided on each of the two intersecting surfaces 87 located on the outer side and the inner side of the annular portion 81. Each recess 85 has two opposite side walls 89. The recess 85 has the form of a groove extending over the entire length H in the extending direction of the central axis C of the upward protruding key portion 83.

According to this configuration, the number of recesses 85 is larger than in the above-described embodiment. Therefore, since a larger amount of the lubricating oil L can be held, the wear of the sliding portion is further suppressed. The number of recesses 85 per intersection surface 87 may be one or three or more.

Further, since the recess 85 capable of holding the lubricating oil L is composed of two facing side walls 89, it is not necessary to reduce a part of the sliding surface 86 in order to obtain a relay portion of the lubricating oil L. Therefore, when any of the two sliding surfaces 86 comes into contact with the fixed guide groove 79 or the movable guide groove 69, elastic deformation of the upward protruding key portion 83 or the downward protruding key portion 84 is promoted. This elastic deformation can also suppress the wear of the upward protruding key portion 83 and the downward protruding key portion 84.

(6-2) Modification B
FIG. 8 shows the structure of the upward protruding key portion 83 of the Oldham joint 80B according to the modified example B. The structure of the downward protruding key portion 84 may be the same as in this figure. The recess 85 is provided in a part of the total length H of the central axis C of the upward protruding key portion 83 in the extending direction on the side of the protruding end portion 88 of the upward protruding key portion 83.

According to this configuration, the recess 85 is provided at the protruding end 88 of the upward protruding key portion 83 or the downward protruding key portion 84. Therefore, the elastic deformation of the protruding end portion 88, which is easily loaded, is promoted, so that the wear of the upward protruding key portion 83 or the downward protruding key portion 84 is further suppressed.

Further, since the recess 85 capable of holding the lubricating oil L is composed of two facing side walls 89, it is not necessary to reduce a part of the sliding surface 86 in order to obtain a relay portion of the lubricating oil L. Therefore, when any of the two sliding surfaces 86 comes into contact with the fixed guide groove 79 or the movable guide groove 69, elastic deformation of the upward protruding key portion 83 or the downward protruding key portion 84 is promoted. This elastic deformation can also suppress the wear of the upward protruding key portion 83 and the downward protruding key portion 84.

(6-3) Modification C
FIG. 9 shows the structure of the upward protruding key portion 83 of the Oldham joint 80C according to the modified example C. The structure of the downward protruding key portion 84 may be the same as in this figure. The recess 85 is provided on the sliding surface 86. The sliding surface 86 slides with the movable guide groove 69.

According to this configuration, the lubricating oil L held in the recess 85 is easily supplied to the sliding surface 86, so that the wear of the upward protruding key portion 83 or the downward protruding key portion 84 is further suppressed.

(6-4) Modification D
FIG. 10 shows the structure of the upward protruding key portion 83 of the Oldham joint 80D according to the modified example D. The structure of the downward protruding key portion 84 may be the same as in this figure. A recess 85 is provided in one of the two intersecting surfaces 87 on the outer side of the annular portion 81. The recess 85 has the form of a hole and is defined by two sets of side walls 89 facing each other. The shape of the hole may be round instead of quadrangular. The recess 85 may be a through hole. The dimensions of the holes are set so that the holes can hold the lubricating oil L due to capillarity or the like.

According to this configuration, since the recess 85 is a hole surrounded by the side wall 89, it is easy to secure the rigidity when the upward protruding key portion 83 or the downward protruding key portion 84 requires a predetermined rigidity.

(6-5) Modification E
FIG. 11 shows the structure of the upward protruding key portion 83 of the Oldham joint 80E according to the modified example E. The structure of the downward protruding key portion 84 may be the same as in this figure. The recess 85 is provided on the sliding surface 86. The recess 85 has the form of a hole and is defined by two sets of side walls 89 facing each other. The shape of the hole may be round instead of quadrangular. The recess 85 may be a through hole.

Even with this configuration, since the recess 85 is a hole surrounded by the side wall 89, it is easy to secure the rigidity when the upward protruding key portion 83 or the downward protruding key portion 84 requires a predetermined rigidity.

(6-6) Modification F
In the above embodiment, the recess 85 is provided in both the upward protruding key portion 83 and the downward protruding key portion 84. Alternatively, the recess 85 may be provided in either the upward protruding key portion 83 or the downward protruding key portion 84.

(6-7) Modification G
In the above embodiment, the fixed guide groove 79 is provided in the frame member 70. Instead of this, a fixed guide groove may be provided in the fixed scroll 50. In this case, the oldham joint 80 is arranged between the fixed scroll 50 and the movable scroll 60.

(6-8) Modification H
In the above-described embodiment, in the upward protruding key portion 83, the plane defined by the sliding surface 86 includes a longitudinal direction MU of the movable guide groove 69, that is, a straight line extending in the moving direction of the upward protruding key portion 83. Instead, the plane defined by the sliding surface 86 may include a straight line inclined by a small acute angle from a straight line extending in the moving direction of the upward protruding key portion 83. In this case, the two sliding surfaces 86 give the upward protruding key portion 83 a tapered shape. The downward protruding key portion 84 may have a tapered shape.

10 Scroll compressor 20 Casing 30 Motor 40 Compression mechanism 50 Fixed scroll 60 Movable scroll 69 Movable guide groove 70, 75 Frame member 79 Fixed guide groove 80 Oldham joint 81 Circular part 83 Upper protruding key part 84 Downward protruding key part 85 Recessed recess 86 Sliding surface 87 Crossing surface 88 Protruding end C Central axis

Japanese Unexamined Patent Publication No. 2014-202076

Claims (5)

Casing (20) and
Fixed scroll (50) and
Movable scroll (60) and
The frame member (70) fixed to the casing and
An old dam joint (80) that suppresses rotation while allowing the movable scroll to revolve,
Equipped with
The fixed scroll or the frame member is provided with a fixed guide groove (79).
The movable scroll is provided with a movable guide groove (69).
The Oldham joint has an annular portion (81) and a key portion (83, 84).
The key portion protrudes from the annular portion in at least the central axis direction which is the extending direction of the central axis (C) of the annular portion, and is radially outward from the annular portion. Protruding,
The key portion is movably arranged in the fixed guide groove or the movable guide groove.
The key portion has at least two sliding surfaces (86) that slide with the fixed guide groove or the movable guide groove.
At least one surface of the key portion is provided with a recess (85) formed by two opposing side walls (89) for holding the lubricating oil .
Both of the two sidewalls are parallel to all of the at least two sliding surfaces.
Scroll compressor (10). The recess is a groove provided over the entire length (H) of the key portion in the central axial direction.
The scroll compressor according to claim 1. The recess is provided on a part of the total length (H) of the key portion in the central axial direction on the side of the protruding end portion (88) protruding from the annular portion in the central axial direction of the key portion. Has been
The scroll compressor according to claim 1. The key portion further has a sliding surface recess provided on the sliding surface.
The scroll compressor according to any one of claims 1 to 3. The key portion has an intersecting surface (87) that intersects the fixed guide groove or the movable guide groove in the longitudinal direction.
The recess is provided on the intersection.
The scroll compressor according to any one of claims 1 to 4.

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