JP2008255850A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a durable and reliable compressor capable of preventing overheat accompanying compression and deformation of a fixed scroll due to pressure, and showing excellent performance for a long period of time. <P>SOLUTION: This scroll compressor has a compression mechanism comprising the fixed scroll and a movable scroll held in a semi-closed vessel and has a bottom plate of the fixed scroll retained and fixed on a rear housing constructing a part of a semi-closed vessel forming casing. The scroll compressor is characterized by fixing the bottom plate of the fixed scroll on the rear housing via a mashing part in which concavities and convexities are mutually meshing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a scroll compressor in which a compression mechanism including a fixed spiral body and a movable spiral body is housed in a semi-hermetic container, and more particularly to a scroll compressor in which a fluid to be compressed is carbon dioxide.

  Conventionally, as a scroll type compressor in which a compression mechanism is housed in a semi-hermetic container, the one shown in FIG. 4 is known. In FIG. 4, reference numeral 100 denotes a scroll compressor. The scroll compressor 100 has a motor housing 101 and a rear housing 102. A center plate 103 is fixed to the motor housing 101, and a movable spiral body 104 is accommodated in the center plate 103. A fixed spiral body 105 fixed to the rear housing 102 is engaged with the movable spiral body 104. A compression mechanism 106 composed of a movable spiral body 104 and a fixed spiral body 105 is housed in a semi-sealed container 107 formed from a center plate 103 and a fixed spiral body 105 as a casing for forming a semi-sealed container.

  The movable spiral body 104 is connected to an electric motor 109 accommodated in the motor housing 101 via a drive shaft 108. When the power from the electric motor 109 is transmitted to the movable spiral body 104 via the drive shaft 108, the movable spiral body 104 pivots with respect to the fixed spiral body 105, whereby the suction port provided in the motor housing 101. The fluid (for example, the refrigerant) sucked from 115 is taken into the fluid pocket 112 formed between the spirals 110 and 111 of the spiral bodies 104 and 105, and the fluid pocket 112 moves to the center while reducing its volume. Then, the compressed fluid is discharged into the discharge chamber 114 through the discharge hole 113 provided in the approximate center of the fixed spiral body 105. A discharge port 116 is connected to the discharge chamber 114.

  In the scroll compressor 100 as described above, the fixed spiral body 105 is fastened together with a rear housing 102 as a case for forming a semi-hermetic container by a bolt 117 and is formed to have substantially the same diameter as the rear housing 102. Has been.

  However, in the scroll compressor 100 as described above, the fixed spiral body 105 may be distorted by heat and pressure applied to the fixed spiral body 105 during the compressor operation. In particular, when the fixed spiral body 105 is heated, the heat may be insufficiently radiated from the axial direction of the fixed spiral body 105. That is, the outer diameter of the fixed spiral body 105 is substantially the same as that of the center plate 104 and the housing 102 forming the semi-hermetic container 107 and is exposed to the outside of the compressor 100. Therefore, the fixed spiral body is fixed in the radial direction. Heat is radiated directly from 105 to the outside. On the other hand, since heat is radiated from the fixed spiral body 105 via the rear housing 102 in the axial direction, heat radiation in the axial direction of the fixed spiral body 105 becomes insufficient and the fixed spiral body 105 is overheated. And distortion may occur. Further, in a scroll type electric compressor in which a motor is built in a semi-hermetic container, or in a high pressure type scroll type compressor in which carbon dioxide is used as a fluid to be compressed, the fixed spiral body may be overheated and distortion may occur. There is.

  When distortion occurs in the fixed spiral body 105, the sealing performance and the refrigerating capacity of the compression mechanism 106 may be reduced. In addition, loss during sliding increases, and the discharge temperature of the refrigerant may increase, or the required power of the compressor may increase. Furthermore, the coefficient of performance may be reduced.

  Further, in the configuration in which the fixed spiral body 105 is formed to have substantially the same diameter as the center plate 104 and the housing 102 that form the hermetic container 107, it is difficult to reduce the size and weight of the apparatus, and to further reduce the cost. May not be able to respond sufficiently.

In addition, although a scroll type compressor in which the outer diameter of the fixed spiral body is reduced and the bottom plate of the fixed housing is accommodated in the rear housing is disclosed (Patent Document 1), even in such a configuration, overheating, The risk of distortion of the fixed spiral body due to the compression pressure has not been eliminated.
JP-A-8-42466

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a compressor with excellent durability and reliability that can reliably prevent overheating due to compression and distortion of a fixed spiral body due to pressure during compression and can exhibit excellent performance over a long period of time. For the purpose.

  In order to solve the above problems, a scroll compressor according to the present invention houses a compression mechanism composed of a fixed spiral body and a movable spiral body in a semi-sealed container, and constitutes a part of a semi-sealed container forming casing. In the scroll type compressor in which the bottom plate of the fixed spiral body is held and fixed to the rear housing, the bottom plate of the fixed spiral body is fixed to the rear housing via a meshing portion in which irregularities are meshed with each other. It consists of what to do. In such a configuration, since the bottom plate of the fixed spiral body is fixed to the rear housing via the engaging portion where the irregularities are meshed with each other, the contact area between the bottom plate of the fixed spiral body and the rear housing is small. As a result, the efficiency of heat conduction from the fixed spiral body to the rear housing is improved, and distortion due to overheating of the fixed spiral body can be prevented. In addition, the disadvantage that the pressure resistance of the fixed spiral body is impaired as a result of preventing overheating of the fixed spiral body is solved. Accordingly, the distortion of the fixed spiral body is surely prevented, and the power loss can be suppressed while improving the sealing performance of the compression mechanism. Therefore, the scroll type compressor can improve the coefficient of performance and has excellent reliability and durability. Can be realized.

  The meshing portion as described above can be constituted by, for example, an annular concave portion provided on one of the bottom plate of the fixed spiral body or the rear housing and an annular convex portion provided on the other and meshed with the concave portion. . If the meshing portion is formed by a combination of a concave portion and a convex portion, the meshing portion can be easily formed. In addition, if the concave portion and the convex portion are formed in an annular shape, the meshing portion is also formed in an annular shape, so that heat of the fixed spiral body can be uniformly and efficiently conducted in the circumferential direction to the rear housing side, The distortion of the fixed spiral body can be prevented more effectively. Further, by engaging the concave and convex portions with each other, the fixed spiral body can be easily positioned with respect to the rear housing, and at the same time, it is possible to contribute to improvement in assembling workability.

  In order to solve the above-mentioned problem, another scroll compressor according to the present invention houses a compression mechanism composed of a fixed spiral body and a movable spiral body in a semi-sealed container, and a semi-sealed container forming casing. In a scroll type compressor in which a bottom plate of a fixed spiral body is held and fixed in a rear housing constituting a part, a fixed spiral body is disposed between a bottom plate housing portion of the fixed spiral body of the rear housing and a bottom plate of the fixed spiral body. A gap extending from the outer periphery of the bottom plate to the outer edge region of the surface on the rear housing side of the bottom plate is provided. According to such a configuration, the fluid to be compressed (for example, refrigerant) sucked from the suction side of the compressor passes through the gap from the outer periphery of the bottom plate of the fixed spiral body to the outer edge of the rear housing side surface of the bottom plate. Since it flows into the region, the entire fixed spiral body is effectively cooled, the fixed spiral body is prevented from overheating, and distortion of the fixed spiral body due to heat and pressure during compression can be prevented. Further, in such a configuration, since the fixed spiral body is housed in the rear housing, the conventional apparatus (FIG. 4) in which the outer diameters of the center plate and the rear housing and the fixed spiral body are formed to be substantially the same diameter. In comparison, since the fixed spiral body can be reduced in size and weight, it is possible to sufficiently meet the demand for cost reduction while achieving reduction in size and weight of the apparatus.

  In order to solve the above-described problem, another scroll compressor according to the present invention includes a compression mechanism composed of a fixed spiral body and a movable spiral body in a semi-sealed container, and is used for forming a semi-sealed container. In a scroll type compressor in which a bottom plate of a fixed spiral body is held and fixed to a rear housing constituting a part of the housing, the bottom plate of the fixed spiral body is connected to the rear housing via a meshing portion in which irregularities are meshed with each other. And a gap extending from the outer periphery of the bottom plate of the fixed spiral body to the outer edge region of the surface on the rear housing side of the bottom plate between the bottom plate housing portion of the fixed spiral body of the rear housing and the bottom plate of the fixed spiral body. It consists of what is provided.

  The scroll compressor according to the present invention is not particularly limited, but is suitable as a scroll type electric compressor in which a motor is built in a semi-hermetic container and the fixed spiral body is easily overheated.

  The fluid to be compressed in the scroll compressor as described above is not particularly limited, and for example, a hydrofluorocarbon refrigerant (for example, HFC134a), carbon dioxide, or the like can be used. The scroll compressor according to the present invention is particularly suitable for a scroll compressor having a high pressure specification because the fluid to be compressed is carbon dioxide.

  As described above, according to the scroll compressor according to the present invention, the bottom plate of the fixed spiral body is fixed to the rear housing via the meshing portion in which the unevenness is meshed with each other. The contact area with the rear housing is increased, the efficiency of heat conduction from the fixed spiral body to the rear housing side is improved, and distortion of the fixed spiral body due to overheating can be prevented. Therefore, the sealing performance of the compression mechanism can be improved and the refrigeration capacity can be improved. Furthermore, since the loss at the time of sliding can be reduced, the required power including the inverter input voltage can be reduced. Further, since the fixed spiral body can be easily and reliably positioned on the rear housing by meshing the concave and convex portions, it is possible to improve the assembling property of the apparatus.

  Further, according to another scroll compressor according to the present invention, the rear of the bottom plate from the outer periphery of the bottom plate of the fixed spiral body is interposed between the bottom plate housing portion of the fixed spiral body of the rear housing and the bottom plate of the fixed spiral body. Since a gap extending to the outer edge area of the surface on the housing side is formed, the fluid to be compressed (for example, refrigerant) sucked from the suction side of the compressor passes through the gap from the outer periphery of the bottom plate of the fixed spiral body to the bottom plate. To the outer edge region of the rear housing side surface. Therefore, the entire fixed spiral body is effectively cooled, and overheating of the fixed spiral body can be prevented. Further, in such a configuration, the fixed spiral body is housed in the rear housing. Therefore, the fixed spiral body can be reduced in size and weight compared to the conventional device in which the outer diameter of the center plate or rear housing and the fixed spiral body is formed to be substantially the same diameter. It is possible to meet the demand for cost reduction while achieving the above.

  Further, according to another scroll type compressor according to the present invention, the bottom plate of the fixed spiral body is fixed to the rear housing via the engaging portion where the concave and convex portions are engaged with each other, and the fixed spiral body of the rear housing Since a gap extending from the outer periphery of the bottom plate of the fixed spiral body to the outer edge region of the surface of the bottom plate on the rear housing side is formed between the bottom plate housing portion of the fixed spiral body and the bottom plate of the fixed spiral body, It can contribute to miniaturization and weight reduction of the device while preventing body distortion.

Hereinafter, preferred embodiments of a scroll compressor according to the present invention will be described with reference to the drawings.
FIG. 1 illustrates scroll compression according to one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a scroll compressor. In this embodiment, the scroll compressor 1 is configured as a scroll type electric compressor in which a compression mechanism 7 is housed in a semi-hermetic container 8. The scroll compressor 1 has a motor housing 2 and a rear housing 3. A center plate 4 is fixed to the motor housing 2, and a movable spiral body 5 is accommodated in the center plate 4. A fixed spiral body 6 fixed to the rear housing 3 is engaged with the movable spiral body 5. A compression mechanism 7 composed of a movable spiral body 5 and a fixed spiral body 6 is housed in a semi-sealed container 8 formed from a center plate 4 and a rear housing 3 as a casing for forming a semi-sealed container. As shown in FIG. 1, the center plate 4 and the rear housing 3 are fitted via an inlay mechanism so that a space in which the compression mechanism 7 is accommodated is formed in a semi-sealed state.

  The movable spiral body 5 includes a bottom plate 9 and a movable spiral 10 fixed to the bottom plate 9. On the other hand, the fixed spiral body 6 includes a bottom plate 11 and a fixed spiral 12 fixed to the bottom plate 11. Then, the movable vortex 10 and the fixed vortex 12 are engaged with each other by shifting the angle, whereby a fluid pocket 13 is formed between the vortex 10 and 12.

  Further, a drive shaft 16 of an electric motor 15 is connected to the movable spiral body 5 via a crank mechanism 14. When the power from the electric motor 15 is transmitted to the movable spiral body 5 via the drive shaft 16 and the crank mechanism 14, the movable spiral body 5 is swung with respect to the fixed spiral body 6, thereby being provided in the motor housing 2. The fluid sucked from the suction port 17 (in this embodiment, carbon dioxide refrigerant) is taken into the fluid pocket 13, and the fluid pocket 13 is moved to the center while reducing its volume, and the compressed fluid is The liquid is discharged into the discharge chamber 19 through a discharge hole 18 provided in the approximate center of the fixed spiral body 6. A discharge port 20 is connected to the discharge chamber 19.

  The bottom plate 11 of the fixed spiral body 6 is accommodated in the bottom plate accommodating portion 24 of the rear housing 3, and the fixed spiral body 6 is held and fixed to the rear housing 3. In the present embodiment, the bottom plate 11 of the fixed spiral 6 is fixed to the bottom plate accommodating portion 24 of the rear housing 3 by a plurality of bolts (not shown). When the fixed spiral body 6 is fixed to the rear housing 3 as described above, a pin (not shown) provided on either the rear housing 3 or the bottom plate 11 of the fixed spiral body 6 is provided on the other side. It is preferable that the bolt is tightened after being inserted into the hole (not shown) and positioned precisely. By positioning in this way, the fixed spiral body can be fixed to the rear housing in a state where the position of the fixed spiral body is strictly regulated, so that it is possible to reliably avoid problems such as compression failure due to poor assembly.

  The fixed spiral body 6 is fixed to the rear housing 3 via a meshing portion 21 composed of an uneven portion. As shown in FIG. 2, the meshing portion 21 includes a concave portion 22 provided on the rear housing side surface 11 a of the bottom plate 11 of the fixed spiral body 6 and a convex portion 23 provided on the rear housing 3 and meshed with the concave portion 22. It is made up of. It is also possible to adopt a mode in which the convex portion 23 is provided on the bottom plate 11 and the concave portion 22 in which the convex portion 23 is engaged is provided on the rear housing. Further, the meshing portion 21 extends in an annular shape as shown in FIG.

  Further, between the bottom plate 11 of the fixed spiral body 6 and the bottom plate housing portion 24 of the rear housing 3, as shown in FIG. 3, it extends from the outer periphery of the bottom plate 11 to the outer peripheral region of the surface 11a on the rear housing side of the bottom plate 11. A gap 25 is provided.

  In the present embodiment, the bottom plate 11 of the fixed spiral body 6 is fixed to the rear housing 3 via the engaging portion 21 in which the projections and recesses are engaged with each other, so that the surface 11a of the bottom plate 11 and the bottom plate accommodation of the rear housing 3 are accommodated. The contact area with the portion 24 is increased, the heat conduction efficiency from the fixed spiral body 6 side to the rear housing 3 side is improved, and distortion of the fixed spiral body 6 due to overheating can be prevented.

  Moreover, since the meshing part 21 is formed by the combination of the recessed part 22 and the convex part 23, the meshing part 21 can be formed easily. Further, since both the concave portion 22 and the convex portion 23 are formed in an annular shape and the engaging portion 21 is also formed in an annular shape, heat from the fixed spiral body 6 side is uniformly and efficiently distributed in the circumferential direction toward the rear housing 3 side. Heat conduction can be performed, and distortion of the fixed spiral body 6 can be prevented.

  Further, in this embodiment, the rear housing of the bottom plate 11 from the outer periphery of the bottom plate 11 of the fixed spiral body 6 between the bottom plate housing portion 24 of the fixed spiral body 6 of the rear housing 3 and the bottom plate 11 of the fixed spiral body 12. Since the gap 25 extending to the outer edge area of the side surface 11a is provided, the fluid to be compressed (for example, refrigerant) sucked from the suction side of the compressor passes through the gap 25 and the outer periphery of the bottom plate 11 of the fixed spiral body. From the bottom housing 11 to the outer edge region of the surface 11a on the rear housing side, the entire fixed spiral body is effectively cooled, and distortion due to overheating of the fixed spiral body 6 can be prevented.

  In the present embodiment, the fixed spiral body 6 is accommodated in the rear housing 3. Therefore, the fixed spiral body can be made smaller and lighter than the conventional device (FIG. 4) in which the outer diameter of the center plate or rear housing and the fixed spiral body is formed to be substantially the same diameter. It is possible to meet the demand for cost reduction while achieving reduction in weight and weight.

  The scroll compressor according to the present invention is suitable as a scroll compressor of a vehicle air conditioner that uses carbon dioxide as a fluid to be compressed, for example.

It is a longitudinal cross-sectional view of the scroll compressor which concerns on one embodiment of this invention. It is a partial expanded sectional view of the A section of the scroll compressor of FIG. It is a partial expanded sectional view of the B section of the scroll type compressor of FIG. It is a longitudinal cross-sectional view of the conventional scroll type compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scroll type compressor 2 Motor housing 3 Rear housing 4 Center plate 5 Movable spiral body 6 Fixed spiral body 7 Compression mechanism 8 Semi-hermetic container 9 Bottom plate of movable spiral body 10 Movable spiral body 11 Bottom plate of fixed spiral body 11a Rear housing side of the bottom plate Surface 12 Fixed spiral 13 Fluid pocket 14 Crank mechanism 15 Electric motor 16 Drive shaft 17 Suction port 18 Discharge hole 19 Discharge chamber 20 Discharge port 21 Engagement part 22 Recess 23 Protrusion 24 Bottom plate accommodation part 25 Gap

Claims (6)

  A compression mechanism consisting of a fixed spiral body and a movable spiral body is housed in a semi-sealed container, and the bottom plate of the fixed spiral body is held and fixed in the rear housing that forms part of the semi-sealed container forming housing. A scroll type compressor, wherein a bottom plate of the fixed spiral body is fixed to a rear housing through a meshing portion in which irregularities are meshed with each other.   2. The scroll according to claim 1, wherein the meshing portion includes an annular concave portion provided on one of a bottom plate of a fixed spiral body or a rear housing, and an annular convex portion provided on the other and meshed with the concave portion. Mold compressor.   A compression mechanism consisting of a fixed spiral body and a movable spiral body is housed in a semi-sealed container, and the bottom plate of the fixed spiral body is held and fixed in the rear housing that forms part of the semi-sealed container forming housing. In the machine, a gap is provided between the bottom plate housing portion of the fixed spiral body of the rear housing and the bottom plate of the fixed spiral body so as to extend from the outer periphery of the bottom plate of the fixed spiral body to the outer edge region of the rear housing side surface of the bottom plate. A scroll compressor characterized by that.   A compression mechanism consisting of a fixed spiral body and a movable spiral body is housed in a semi-sealed container, and the bottom plate of the fixed spiral body is held and fixed in the rear housing that forms part of the semi-sealed container forming housing. In the machine, the bottom plate of the fixed spiral body is fixed to the rear housing via a meshing portion in which irregularities are meshed with each other, and between the bottom plate housing portion of the fixed spiral body of the rear housing and the bottom plate of the fixed spiral body. And a clearance extending from the outer periphery of the bottom plate of the fixed spiral body to the outer edge region of the rear housing side surface of the bottom plate.   The scroll compressor according to any one of claims 1 to 4, comprising an electric compressor in which a motor is incorporated in a semi-hermetic container. The scroll compressor according to any one of claims 1 to 5, wherein the fluid to be compressed is carbon dioxide.

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