JP2013221450A - Gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To strongly support a compressor body while suppressing an increase in cost in a gas compressor.SOLUTION: A compressor body 60 is housed inside a housing 10 having a body case 11 and a front cover 12. When the body case 11 and the front cover 12 are fastened to each other by a bolt 18 (fastening member), the compressor body 60 is fixed to the inside of the housing 10 while being sandwiched by the body case 11 and the front cover 12.

Description

  The present invention relates to a gas compressor, and more particularly to an improvement of a vane rotary type gas compressor.

  In the air conditioning system, a gas compressor for compressing a gas such as a refrigerant gas and circulating the gas in the air conditioning system is used.

  In this gas compressor, a compressor main body that is driven to rotate and compresses gas is housed in a housing, and a discharge chamber into which high-pressure gas is discharged from the compressor main body is disposed inside the housing and the compressor main body. The high-pressure gas is discharged from the discharge chamber to the outside of the housing.

  In the compressor main body of such a gas compressor, one end side in the axial direction is cantilevered on the housing by a fastening member, and the other end side in the axial direction is elastically supported on the inner surface of the housing via a seal member or the like. (Patent Documents 1 and 2).

Japanese Utility Model Publication No. 7-042448 Japanese Utility Model Publication No. 4-132485

  However, since the compressor body rotates around the rotation axis inside, the cantilever is easy to swing, and if it is swung, abnormal noise or the like may occur.

  On the other hand, if the other end side is also strongly supported, a configuration in which more fastening members are used correspondingly increases the cost.

  This invention is made | formed in view of the said situation, Comprising: It aims at providing the gas compressor which can support a compressor main body firmly, suppressing a cost increase.

  The gas compressor according to the present invention is a state in which the main body case and the cover, which are constituent elements of the housing, are fastened, and the compressor main body housed in the housing is sandwiched and fixed between the main body case and the cover, The compressor main body is firmly supported at substantially both ends in the axial direction, and it is not necessary to separately fasten the compressor main body and the housing with a fastening member, thereby suppressing an increase in cost.

  That is, in the gas compressor according to the present invention, the compressor main body is housed in a housing having a substantially cylindrical main body case with one end closed and a cover that closes the opening of the other end of the main body case. In the gas compressor, when the main body case and the cover are fastened by a fastening member, the main body case and the cover are sandwiched between the compressor main bodies and fixed inside the housing.

  The gas compressor according to the present invention can firmly support the compressor body while suppressing an increase in cost.

It is a perspective view showing the appearance of the vane rotary compressor which is one embodiment of the gas compressor concerning the present invention. It is a longitudinal cross-sectional view which shows the inside of the vane rotary compressor shown in FIG. It is a disassembled perspective view of the vane rotary compressor shown in FIG.

  Hereinafter, specific embodiments of a gas compressor according to the present invention will be described in detail with reference to the drawings.

  A vane rotary compressor 100 (hereinafter simply referred to as a compressor 100), which is an embodiment of a gas compressor according to the present invention, is an air having an evaporator, a gas compressor, a condenser, and an expansion valve installed in an automobile or the like. Used as a gas compressor in harmony systems. This air conditioning system constitutes a refrigeration cycle by circulating a refrigerant gas G (gas).

  The compressor 100 accommodates a compressor body 60 (see FIG. 2) that compresses the refrigerant gas G (gas) at a high temperature and a high pressure inside the housing 10 shown in FIG.

  The housing 10 includes a substantially cylindrical main body case 11 with one end closed, and a front cover 12 (cover) that closes an opening at the other end of the main body case 11. The front cover 12 is fastened and fixed by four bolts 18 (fastening members) inserted from the front cover 12 side along a direction in which a rotating shaft 51 described later extends.

  Then, in a state where the main body case 11 and the front cover 12 are fastened by the bolts 18, a space for completely accommodating the compressor main body 60 is formed inside the main body case 11 and the front cover 12. Yes.

  In addition, as shown in FIG. 2, the housing 10 is disposed in a gap S formed between the main body case 11 and the front cover 12 with the main body case 11 and the front cover 12 being fastened. An O-ring 19 that hermetically seals the inside and outside of the housing 10 is provided.

  As shown in FIG. 2, the front cover 12 is formed with a suction port 12 a through which the low-pressure refrigerant gas G is introduced from the evaporator of the air conditioning system into the housing 10 through the inside and the outside of the housing 10. ing.

  On the other hand, the main body case 11 is formed with a discharge port 11a through which the high-pressure refrigerant gas G is discharged from the inside of the housing 10 to the condenser of the air conditioning system through the inside and the outside of the housing 10.

  The compressor main body 60 accommodated in the housing 10 includes a rotary shaft 51 that is rotatable around an axis C, a substantially cylindrical rotor 50 that rotates integrally with the rotary shaft 51, and the rotor 50. A cylinder 40 having a contoured inner peripheral surface 41 surrounding the outer peripheral surface 52 from the outside, and three plate-like members provided so as to protrude from the outer peripheral surface 52 of the rotor 50 toward the inner peripheral surface 41 of the cylinder 40. A vane 58 and two side blocks (front side block 20 and rear side block 30) that block both ends of the rotor 50 and the cylinder 40 are provided.

  Here, the rotating shaft 51 is rotatably supported around the axis C by a bearing 12b formed on the front cover 12 and bearings 27 and 37 respectively formed on the side blocks 20 and 30 of the compressor body 60. In addition, a portion of the rotating shaft 51 that protrudes from the front cover 12 to the outside is provided with a pulley, a gear, and the like, and the pulley, the gear, and the like are rotated by receiving transmission of power from the engine of the vehicle.

  Further, the compressor main body 60 accommodated in the housing 10 divides the space inside the housing 10 into a left space and a right space sandwiching the compressor main body 60 in FIG.

  Here, a first pressing surface 11c that contacts the outer surface 30a (one end surface of the compressor main body) of the rear side block 30 of the compressor main body 60, which faces the opening at the other end, is located inside the main body case 11. Is formed.

  On the other hand, on the inner surface of the front cover 12, a second pressing surface 12c that faces the opening of the main body case 11 and contacts the outer surface 20a of the front side block 20 of the compressor main body 60 (the other end surface of the compressor main body) is formed. Has been.

  When the main body case 11 and the front cover 12 are fastened with the bolts 18, the first pressing surface 11 c is in contact with the outer surface 30 a of the rear side block 30, and the second pressing surface 12 c is in contact with the outer surface 20 a of the front side block 20. Thus, the compressor main body 60 is sandwiched between the main body case 11 and the front cover 12, and the compressor main body 60 is fixed inside the housing 10.

  Of the two spaces partitioned inside the housing 10, the space on the left side of FIG. 2 sandwiching the compressor body 60 is a suction chamber 13 in a low-pressure atmosphere into which a low-pressure refrigerant gas G is introduced from the evaporator through the suction port 12 a. The space on the right side of FIG. 2 across the compressor body 60 is a high-pressure atmosphere discharge chamber 14 in which high-pressure refrigerant gas G is discharged to the condenser through the discharge port 11a.

  The interior of the compressor main body 60 includes two vanes 58 that follow each other in the rotational direction W of the rotor 50, the outer peripheral surface 52 of the rotor 50, the inner surfaces of the side blocks 20 and 30, and the inner peripheral surface of the cylinder 40. 41 are formed in the front side block 20 from the suction chamber 13 in the process of increasing the volume of the compression chamber. In the process of introducing the low-pressure refrigerant gas G into the compression chamber through the formed suction hole and then reducing the volume of the compression chamber by closing the suction hole, the refrigerant gas G confined in the compression chamber is compressed. In the process of reducing the volume of the compression chamber, the refrigerant gas G in the compression chamber is further compressed to a high temperature and a high pressure, discharged from the discharge valve 45, and discharged from the rear side block 30. Discharged into the discharge chamber 14 through the hole.

  In the discharge chamber 14, the discharged refrigerant gas G collides with the wall surfaces of the main body case 11 and the rear side block 30, whereby the refrigeration oil R (oil content) mixed in the refrigerant gas G is separated, and the separated refrigeration oil R is separated. The refrigerant gas G, which has fallen and stored at the bottom of the discharge chamber 14 and from which the refrigerating machine oil R has been separated, is discharged to an external condenser through the discharge port 11a.

  On the other hand, the refrigerating machine oil R stored at the bottom of the discharge chamber 14 passes through oil passages formed in the rear side block 30, the cylinder 40, the front side block 20, and the like due to the pressure of the high-pressure refrigerant gas G discharged into the discharge chamber 14. The supplied refrigerating machine oil R is supplied to a vane groove formed in the rotor 50, and has a back pressure that forms a compression chamber by causing the vane 58 accommodated in the vane groove to protrude outward.

  According to the compressor 100 of the present embodiment configured as described above, when the main body case 11 and the front cover 12 are fastened by the bolts 18, the compressor main body 60 accommodated in the housing 10 is fastened. The outer surface 20a of the front side block 20 that is both ends of the first pressing surface 11c of the main body case 11 and the second pressing surface 12c of the front cover 12 along the direction (the direction in which the rotation shaft 51 extends). Since the compressor main body 60 is sandwiched and fixed inside the housing 10 by pressing the outer surface 30a of the rear side block 30 in the opposite direction, both ends of the compressor main body 60 are supported without being cantilevered. It is assumed to be a stable and supported state of both ends.

  Therefore, even if the rotating shaft, the rotor 50, etc. rotate inside the compressor main body 60, the rocking hardly occurs, and the generation of abnormal noise due to the rocking can be suppressed.

  In addition, since there is no fastening member such as a bolt for directly fastening the housing 10 and the compressor main body 60, the number of fastening members such as bolts conventionally used for fastening the housing and the compressor main body can be reduced, and the cost can be reduced. It can also be suppressed.

  Further, in the compressor 100 of the present embodiment, the compressor main body 60 closes both ends of the cylinder 40 that surrounds the outer periphery 52 of the substantially columnar rotor 50 with the front side block 20 and the rear side block 30, respectively. The bolt 18 fastens only the main body case 11 and the front cover 12 without penetrating the compressor main body 60. Therefore, the attitude of the compressor main body 60 around the axis C of the rotary shaft 51 is determined. However, it does not depend on the attitude of the housing 10 around the axis C.

  Therefore, the orientation of the compressor main body 60 can be set regardless of the orientation of the housing 10 that is the outer shape of the compressor 100 for convenience such as the installation space of the compressor 100 in a vehicle or the like.

  The compressor 100 according to the present embodiment has a structure in which the front side block 20 and the rear side block 30 that are components of the compressor main body 60 are not directly fastened by the fastening members such as the bolts 18, and thus are directly fastened by the fastening members. In this case, deformation caused by the fastening stress or the like that may occur in the case is hardly generated in the compressor main body 60, and leakage of the refrigerant gas G and the refrigerating machine oil R from the compressor main body 60 can be avoided.

  Further, the compressor 100 of the present embodiment has a simple configuration in which the first pressing surface 11c is formed inside the main body case 11 and the second pressing surface 12c is formed on the inner surface of the front cover 12. The compressor main body 60 can be firmly supported by both ends inside the housing 10.

  Furthermore, since the compressor 100 of the present embodiment has a structure in which the compressor main body 60 is sandwiched between the first pressing surface 11c of the main body case 11 and the second pressing surface 12c of the front cover 12, the main body case 11 and the front surface When the cover 12 is fastened with the bolt 18, a gap S remains between the main body case 11 and the front cover 12. The gap S includes an O-ring 19 that hermetically seals the inside and outside of the housing 10. Therefore, the refrigerant gas G and the refrigerating machine oil R can be prevented from leaking outside the housing 10 through the gap S.

  The compressor 100 according to the present embodiment compresses the compressor main body 60 firmly against the housing 10 by the first pressing surface 11c of the main body case 11 and the second pressing surface 12c of the front cover 12. Although the machine main body 60 is not displaced in the direction along the axis C inside the housing 10, it is difficult to suppress the relative rotation around the axis C of the compressor main body 60 only by the frictional force. In some cases, as shown in FIGS. 2 and 3, the housing 10 and the compressor main body are provided with a rotation-preventing pin 17 that prevents a relative angular shift about the axis C between the housing 10 and the compressor main body 60. 60 is preferably connected.

  Thus, by the structure which connected the housing 10 and the compressor main body 60 with the rotation prevention pin 17, the relative rotation of the compressor main body 60 with respect to the housing 10 can be blocked | prevented.

  In the compressor 100 of the present embodiment, two rotation prevention pins 17 penetrating the main body case 11, the rear side block 30, and the cylinder 40 are provided around the axis C by an angle other than an angle of 180 [degrees]. Similarly, two anti-rotation pins 17 penetrating the front cover 12, the front side block 20, and the cylinder 40 are provided around the axis C apart from each other by an angle other than 180 [deg.] To compress the housing 10 By connecting the machine main body 60, it is possible to prevent the housing 10 and the compressor main body 60 from being erroneously assembled with an angular deviation of 180 degrees in the angle around the axis C.

  The compressor 100 of the embodiment described above has three vanes 58, but the gas compressor according to the present invention is not limited to this form, and the number of vanes is 2, 4, and 5. 6 and the like can be appropriately selected, and the same operation and effect as the above-described embodiment and the compressor 100 can be obtained also by the gas compressor to which the selected number of vanes are applied.

  In addition, the gas compressor according to the present invention may be a so-called two-stage type in which one cycle of suction, compression, and discharge is performed twice during one rotation of the rotation shaft. It may be a so-called one stage in which one stroke is performed once during one rotation.

DESCRIPTION OF SYMBOLS 10 Housing 11 Main body case 11c 1st press surface 12 Front cover 12c 2nd press surface 18 Anti-rotation pin (rotation prevention member)
19 O-ring 20 Front side block 20a, 30a Outer surface (one end surface, the other end surface)
30 Rear side block 40 Cylinder 50 Rotor 51 Rotating shaft 60 Compressor body 100 Vane rotary compressor (gas compressor)
C Center axis G Refrigerant gas (gas)
R Refrigerating machine oil (oil content)
W Rotation direction S Clearance

Claims (5)

In a gas compressor in which a compressor main body is housed in a housing having a substantially cylindrical main body case with one end closed and a cover that closes the opening of the other end of the main body case.
A gas compressor characterized in that when the main body case and the cover are fastened by a fastening member, the main body case and the cover sandwich the compressor main body and are fixed inside the housing. The compressor body is formed by closing both ends of a cylinder surrounding the outer periphery of the substantially cylindrical rotor with side blocks,
The gas compressor according to claim 1, wherein the fastening member fastens only the main body case and the cover without penetrating the compressor main body. Inside the main body case, a first pressing surface facing the opening and in contact with one end surface of the compressor main body is formed,
On the inner surface of the cover, a second pressing surface is formed that faces the opening and contacts the other end surface of the compressor body.
When the main body case and the cover are fastened by a fastening member, the first pressing surface is in contact with the one end surface, and the second pressing surface is in contact with the other end surface, so that the main body case and the cover are The gas compressor according to claim 1, wherein the compressor main body is sandwiched by the gas compressor.   The O-ring which is arrange | positioned in the clearance gap formed between the said main body case and the said cover and seals the inside and outside of a housing airtightly is provided. The gas compressor described in 1.   The said housing and the said compressor main body are connected with the rotation prevention member which prevents the angle shift | offset | difference around the rotating shaft of the said compressor main body, The any one of Claim 1 to 4 characterized by the above-mentioned. Gas compressor.