JP5456452B2 - Gas compressor - Google Patents

Description

  The present invention relates to a gas compressor used in a car air conditioner system and the like, and more particularly, to an improvement in durability of a vane rotary type compressor body.

  Conventionally, a gas compressor (compressor) for compressing a gas (refrigerant gas) and circulating the gas in the air conditioning system is used in an air conditioning system such as a car air conditioner system.

  Here, a vane rotary type compressor is known as a typical type of compressor. This vane rotary type compressor has a structure in which a compressor main body is accommodated in a housing.

  The compressor main body includes a substantially cylindrical rotor that rotates integrally with the rotating shaft, a cylinder that surrounds the outer periphery of the rotor (the cylindrical peripheral surface), and a cross-sectional contour of the inner peripheral surface that is substantially elliptical; A plurality of plate-like vanes embedded in a plurality of vane grooves formed on the outer periphery of the rotor, the protrusion amount from the outer peripheral surface of the rotor being variable so that the tip on the protruding side follows the inner peripheral surface of the cylinder; Two side blocks (a front side block on the cylinder front end side and a cylinder) that cover the rotor and the vanes from both ends of the rotor and have bosses formed on the outer surfaces of the bearings that support the rotating shafts protruding from the rotor on both sides. The rear end side rear block) and the vane according to the pressure of the oil (vane back pressure) supplied to the back pressure space facing the buried end of the vane in the vane groove and the rotation of the rotor By the centrifugal force acting on the over emissions, and is configured so as to protrude from the outer circumferential surface of the rotor.

  A plurality of compressions are achieved by the mutually opposing surfaces of the two vanes that follow each other in the rotational direction of the rotor, the inner peripheral surface of the cylinder, the outer peripheral surface of the rotor, and the end surfaces of both side blocks (the inner end surfaces facing the rotor) A chamber is formed.

  The compression chamber changes its volume as the rotor rotates, sucks refrigerant gas from the suction port provided on the cylinder wall surface (intake stroke), and then compresses the refrigerant gas sealed in the compressor (compression stroke). The gas is discharged from a discharge port provided on the cylinder wall surface (discharge process).

  The discharged high-temperature and high-pressure refrigerant gas is sent to a condenser (condenser) where it is liquefied. The liquefied refrigerant gas is then sent to an evaporator (evaporator) where it takes heat away from the surroundings and cools the surroundings when vaporized. The vaporized refrigerant gas is sent again to the compressor, and sucked from the suction port, and the above process is repeated.

  In the compressor body configured as described above, since there is a clearance between the vane and the side block, the vane does not slide along the side block, and moves by tilting and tilting, thereby causing the vane to move to the inner periphery of the cylinder. The surface may be contacted at an angle, which may cause deformation on the inner circumferential surface of the cylinder. If the vane slides and collides with the deformed portion in a normal state instead of being inclined, the deformed portion may be damaged and the compressor may be seized.

  As an invention for preventing seizure caused by the inclination of the vanes, there has been proposed one in which escape portions are formed in advance at the corners of the cylinder inner peripheral surface to prevent seizure (Patent Document 1). ).

Japanese Utility Model Publication No. 63-108585

  However, foreign substances such as burrs may be generated at the corners of the inner peripheral surface of the cylinder, even if the vane does not move while tilting in the above-described compressor body.

  That is, in a compressor having a structure in which the side block is fastened to the cylinder by a plurality of fastening bolts, assembly deformation in which the inner peripheral surface of the cylinder is deformed into a concave shape in the thickness direction of the cylinder is generated by bolt fastening. There is a case. Particularly, in the vicinity of the bolt fastening portion between the cylinder and the side block, since the space between the bolt hole and the inner peripheral surface of the cylinder is thin, this assembly deformation is likely to occur.

  When the rotor rotates and the vane slides in the cylinder in which such assembly deformation has occurred, the vane does not come into contact with the corner of the cylinder inner peripheral surface at the portion where the assembly deformation has occurred. A step due to residual wear occurs between the part that has not been contacted and the part that is not in contact. If this level difference becomes a burr, and the compressor continues to operate, the burr may fall off and get caught between the side block and the rotor, etc., causing the compressor to lock and stop the operation. There is sex.

  Conventionally, no measures have been taken that focus on the remaining wear caused by such assembly deformation.

  The present invention has been made in view of the above problems, and even if assembly deformation occurs in the cylinder inner peripheral corner, it is possible to prevent occurrence of residual wear on the cylinder inner peripheral corner due to the assembly deformation. Therefore, an object of the present invention is to provide a highly durable gas compressor.

  The gas compressor according to the present invention includes a rotor that rotates about the rotation shaft integrally with the rotation shaft, a cylinder that surrounds the outer peripheral surface of the rotor, and a plurality of vanes formed on the surface of the rotor. A plurality of vanes housed in a groove so as to be able to protrude and retract from the vane groove, and a front side block and a rear side block fastened to both ends of the cylinder, and joining the cylinder and the front side block Cylinder and front side block or cylinder and rear side block of cylinder inner peripheral surface corner in contact with surface and cylinder inner peripheral surface corner in contact with joint surface of cylinder and rear side block Cylinder inner peripheral surface corners in a range in which assembly deformation due to fastening of the cylinder and the front side Lock, or, it is characterized in that it is larger removed than the cylinder inner peripheral surface corner portion of the range of variations assembled by engagement of the cylinder and the rear side block is not generated.

  Here, the above-mentioned “the cylinder inner peripheral surface corner in a range in which assembly deformation due to the fastening between the cylinder and the front side block or the cylinder and the rear side block occurs is the cylinder and the front side block, or "The cylinder inner peripheral corner in the range where no assembly deformation occurs due to the fastening of the cylinder and the rear side block is removed" means that the cylinder inner peripheral corner in the range where no assembly deformation occurs is small. The cylinder inner peripheral surface corners in a range where assembly deformation does not occur may not be removed at all.

  Therefore, according to the gas compressor of the present invention, since the range in which the assembly deformation of the cylinder occurs has been removed in advance, it is possible to prevent the occurrence of residual wear on the corner portion of the cylinder inner peripheral surface due to the assembly deformation. This can improve the durability of the gas compressor.

  In the gas compressor according to the present invention, the range in which the assembly deformation is generated is such that the inner circumference of the cylinder is close to a fastening bolt that fixes the cylinder and the front side block, and the cylinder and the rear side block. It is preferable to include a face corner.

  According to the gas compressor having such a preferable configuration, by removing the corner portion of the cylinder inner peripheral surface in the immediate vicinity of the fastening bolt where the assembly deformation of the cylinder is remarkably generated, the wear of the corner portion of the cylinder inner peripheral surface is generated. This can be prevented more effectively, thereby further improving the durability of the gas compressor and limiting the machining range of the inner peripheral corner of the cylinder, thereby reducing the machining time and cost of the cylinder. it can.

  In the gas compressor according to the present invention, it is preferable that a range in which the assembly deformation occurs is in a position corresponding to a gas suction stroke range in the corner portion of the cylinder inner peripheral surface.

  According to the gas compressor having such a preferable configuration, the removal range of the inner peripheral corner portion of the cylinder is limited to the suction stroke range, so that the gas (refrigerant gas) leaks into the adjacent compression chamber. Can be prevented.

  Further, in the gas compressor according to the present invention, the range in which the assembly deformation occurs is a position corresponding to a gas suction stroke range, and the cylinder and the front side block, and the cylinder and the rear side It is desirable to include the cylinder inner peripheral corner portion in the immediate vicinity of the fastening bolt that fixes the block.

  According to the gas compressor having such a preferable configuration, since the removal range of the inner peripheral corner portion of the cylinder is limited to the suction stroke range, the gas (refrigerant gas) can be prevented from being leaked and the cylinder can be prevented. By removing the corner of the cylinder inner surface near the fastening bolt where the assembly deformation of the cylinder occurs remarkably, it is possible to more effectively prevent the occurrence of residual wear on the corner of the cylinder inner surface. The durability of the machine is further improved, and the processing range of the inner peripheral corner of the cylinder is limited, so that the processing time and processing cost of the cylinder can be reduced.

  In the gas compressor according to the present invention, it is desirable that a range in which the assembly deformation occurs is a range substantially equal to the fastening bolt diameter along a circumferential direction of the cylinder inner peripheral surface corner.

  According to the gas compressor having such a preferable configuration, the processing range of the cylinder inner peripheral surface corner portion is further limited, and therefore the processing time and processing cost of the cylinder can be further reduced.

  Further, in the gas compressor according to the present invention, it is desirable that the shape of the corner portion of the cylinder inner peripheral surface in a range where the assembly deformation is generated maintains the shape at the time of cylinder molding.

  According to the gas compressor having such a preferable configuration, the inner peripheral surface corner portion can be molded at the same time when the cylinder is molded, so that the processing time and processing cost of the cylinder can be reduced.

  Further, in the gas compressor according to the present invention, the shape of the cylinder inner peripheral surface corner in the range where the assembly deformation occurs is substantially the same as the outer ring portion of the cutting tooth of the tool used for cutting. Is desirable.

  According to the gas compressor having such a preferable configuration, the inner peripheral surface of the cylinder is formed by one-pass processing (a method in which a processing tool is passed through the workpiece and processing is performed from cutting to polishing in one reciprocating operation) after cylinder molding. Since corners can be machined, machining time and machining cost can be reduced when machining the inner circumferential corner of the cylinder after cylinder molding.

  Further, in the gas compressor according to the present invention, the cylinder inner peripheral surface corner in a range where the assembly deformation occurs is chamfered larger than the cylinder inner peripheral corner other than the range in which the assembly deformation occurs. It is desirable.

  According to the gas compressor having such a preferable configuration, it is possible to remove a specific corner portion of the inner peripheral surface of the cylinder at the same time as the chamfering processing for deburring of the inner peripheral surface corner portion of the cylinder after the cylinder molding. Therefore, the processing time of the cylinder can be reduced.

  Further, in the gas compressor according to the present invention, the corner portion of the cylinder inner peripheral surface in the range where the assembly deformation occurs is formed between a joint surface between the cylinder and the front side block, and the cylinder and the rear side block. It is desirable that the clearance is larger than the clearance between the front side block and the vane and the clearance between the rear side block and the vane in a direction perpendicular to the joint surface.

  According to the gas compressor having such a preferable configuration, the cylinder inner peripheral surface corner is removed to be larger than the clearance between the front side block and the vane and the rear side block and the vane. It is possible to more reliably prevent the occurrence of remaining wear, and thereby the durability of the gas compressor is further improved.

  According to the gas compressor according to the present invention, by removing in advance the cylinder inner peripheral surface corner in the range where assembly deformation occurs when the cylinder and the side block are fastened, the remaining wear on the inner peripheral surface corner of the cylinder is eliminated. Can be prevented, thereby improving the durability of the gas compressor.

It is a longitudinal section (lower half) showing a vane rotary type compressor which is one embodiment of a gas compressor concerning a 1st embodiment of the present invention. It is a figure which shows the cross section along the AA of FIG. (A) It is a figure which shows the generation | occurrence | production situation of the assembly | attachment deformation | transformation of a cylinder. (B) It is a figure which shows the generation | occurrence | production situation of the abrasion residue of a cylinder internal peripheral surface corner | angular part. (A) It is the figure which showed one example of embodiment of 1st Example of this invention with the cross section along the BB line of FIG. (B) It is the figure which showed another embodiment of 1st Example of this invention with the cross section along the BB line of FIG. It is a transverse cross section showing a vane rotary type compressor which is one embodiment of a gas compressor concerning a 2nd embodiment of the present invention.

  Embodiments of the gas compression apparatus according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a longitudinal sectional view (lower half) showing a compressor 100 called a vane rotary type used in a vehicle air conditioning system, which is an embodiment of a gas compressor of the present invention. Moreover, FIG. 2 is a figure which shows the cross section along the AA of FIG.

  Hereinafter, the configuration and operation of the present embodiment will be described with reference to FIGS. The compressor 100 performs cooling using the heat of vaporization of the cooling refrigerant. For example, the compressor 100 is used as a part of a vehicle air conditioning system, and includes other components such as a condenser, an expansion valve, an evaporator, etc. Are also provided on the refrigerant circulation path.

  The compressor 100 compresses the refrigerant gas as a gaseous refrigerant taken from the evaporator of the air conditioning system, and supplies the compressed refrigerant gas to the condenser of the air conditioning system. The condenser liquefies the compressed refrigerant gas and sends it to the expansion valve as a high-pressure liquid refrigerant.

  The high-pressure liquid refrigerant is reduced in pressure by the expansion valve and sent to the evaporator. The low-pressure liquid refrigerant absorbs heat from ambient air and vaporizes in the evaporator, and cools the air around the evaporator by heat exchange with the heat of vaporization.

  The vaporized low-pressure refrigerant gas returns to the compressor 100 and is compressed, and the above process is repeated thereafter.

  Here, the compressor 100 includes a compressor main body 44 housed in the housing 10 including the case 12 and the front head 14.

  The case 12 has a cylindrical body open at one end, and the front head 14 is assembled so as to cover the opened part of the case 12. The front head 14 is formed with a suction port 14a through which low-pressure refrigerant gas is sucked from an evaporator (not shown), while the case 12 receives high-pressure refrigerant gas compressed by the compressor body 44. A discharge port 12a for discharging to a condenser (not shown) is formed.

  The compressor main body 44 accommodated in the housing 10 includes a rotary shaft 36 that is driven to rotate about its axis, a columnar rotor 34 that rotates integrally with the rotary shaft 36, and a rotor outer peripheral surface 34a. The cylinder inner peripheral surface 30a surrounding the outside of the cylinder is substantially elliptical in cross section, and is embedded in the cylinder 30 having both ends open and five vane grooves 38 formed in the rotor 34 at equal angular intervals around the axis. Thus, the front head 14 is connected to the cylinder 30 by means of the fastening bolts 58a and the five plate-like vanes 40 in which the protruding amount from the rotor outer peripheral surface 34a is variable so that the vane tip 40a follows the cylinder inner peripheral surface 30a. The front side block 24 fastened through the cylinder and the rear side block 18 fastened to the cylinder 30 from the case 12 side by the fastening bolt 58b. Have.

  The volume of each compression chamber 32 formed by the rear side block 18, the front side block 24, the rotor 34, the cylinder 30, and the two vanes 40, 40 that are adjacent to each other in the rotation direction of the rotation shaft 36 is By repeating the increase / decrease according to the rotation, the refrigerant gas sucked into each compression chamber 32 is compressed and discharged.

  One portion of the rotary shaft 36 that protrudes from both ends of the rotor 34 is pivotally supported by the front side block bearing portion 26 and extends outward through the front head 14. It is supported by. Similarly, the other side of the protruding portion of the rotating shaft 36 is pivotally supported by the rear side block bearing portion 22.

  The support of the rotary shaft 36 by the front head 14 and the outer peripheral portions of the rear side block 18 and the front side block 24 are held on the inner peripheral surface of the case 12 and the front head 14 by an O-ring or the like (not shown). Thus, the compressor main body 44 is held at a predetermined position in the housing 10.

  Further, the discharge chamber 20 is formed by the rear side block 18 and the case 12 in a state where the compressor main body 44 is accommodated in the case 12, while the suction chamber 28 is formed by the front side block 24 and the front head 14. The discharge chamber 20 communicates with the discharge port 12a, and the suction chamber 28 communicates with the suction port 14a.

  The suction chamber 28 and the discharge chamber 20 are hermetically isolated by the above-described O-ring or the like. The rear side block 18 is assembled with a cyclone block (not shown) for separating the refrigerating machine oil from the refrigerant gas, and the cyclone block is disposed in the discharge chamber 20.

  Further, at the lower part of the discharge chamber 20, the sliding portion of the compressor 100 and the like are lubricated, cooled, and cleaned, and the vane 40 is protruded toward the cylinder inner peripheral surface 30a, and the vane tip 40a is protruded toward the cylinder inner peripheral surface 30a. Refrigerating machine oil for applying a back pressure (protrusion pressure) to the vane 40 is stored so as to urge the vane 40 to abut.

  As shown in FIG. 2, the rotor 34 is formed with five slit-like vane grooves 38 in which the vanes 40 described above are embedded radially and at equal angular intervals around the rotation center of the rotor 34. The vane 40 inserted into the rotor 38 has a centrifugal force generated by the rotation of the rotor 34, and a hydraulic pressure (back pressure) by the refrigerating machine oil supplied to the vane back pressure space 42 facing the vane burying side end 40 b of the vane groove 38. The vane tip 40a protrudes toward the cylinder inner peripheral surface 30a in accordance with the resultant force (combined pressure), and is biased so that the vane tip 40a is in contact with the cylinder inner peripheral surface 30a. 40a follows the cylinder inner peripheral surface 30a.

  Thus, each compression chamber 32 defined by the cylinder 30, the rotor 34, and the two vanes 40 and 40, which are arranged in the rotational direction of the rotating shaft 36, the front side block 24, and the rear side block 18, The change of the volume is repeated according to the rotation of the rotor 34, the refrigerant gas is sucked from the suction chamber 28 during the period when the volume is increased, and the compressed refrigerant gas is compressed during the period when the volume is decreased, and the compressed high-pressure refrigerant gas Is discharged into the discharge chamber 20 through a cyclone block (not shown), and the same steps as described above are sequentially repeated.

  Here, as shown in FIG. 2, the cylinder 30 and the rear side block 18 are fastened by six fastening bolts 58b. Further, although not shown in FIG. 2, the cylinder 30 and the front side block 24 are fastened by six fastening bolts 58a.

  At this time, the cylinder 30 is deformed so that the corner portion of the inner peripheral surface of the cylinder 30 rises toward the inside of the compression chamber 32 as shown in FIG. 3A due to the fastening force of the fastening bolts 58a and 58b. In other words, so-called assembly deformation may occur. This assembly deformation particularly occurs in the vicinity of the fastening bolt where the cylinder is thinned. As a result, the cylinder inner peripheral surface 30a is deformed into a concave shape along the thickness direction of the cylinder. When the compressor 100 is operated in this state and the vane 40 slides, as shown in FIG. 3B, the vane 40 does not collide with the corner portion of the cylinder inner peripheral surface, so that the wear residue 110 is generated.

  In order to prevent the occurrence of this wear residue 110, in this embodiment, all the 12 fastening bolts 58a, 58b in the immediate vicinity of the cylinder inner peripheral surface specific corner 60 are fastened over the circumferential direction of the inner peripheral surface of the cylinder 30. The bolts 58a and 58b are removed in a range substantially equal to the diameter. FIG. 4A shows the state of the corners of the cylinder inner peripheral surface thus removed. As shown in the figure, the removed corners are tapered chamfered.

  If the compressor 100 is operated in this state, it is possible to prevent the occurrence of the remaining wear 110 due to the sliding of the vanes 40.

  As described above, according to the first embodiment, by removing in advance a cylinder inner peripheral surface corner in a range where the assembly deformation of the cylinder 30 occurs, generation of the remaining wear 110 at the inner peripheral surface corner of the cylinder is generated. Thus, the durability of the compressor 100 can be improved. Moreover, since it is not necessary to process the cylinder inner peripheral surface corner part over the entire periphery, the processing time and processing cost of the cylinder inner peripheral surface corner part are reduced.

  Here, the removal amount δa of the cylinder inner peripheral surface specific corner portion is, as shown in FIG. 4A, the clearance δb between the front side block 24 and the vane 40 in the thickness direction of the cylinder, and It is desirable that the clearance be larger than the clearance δb between the rear side block 18 and the vane 40. By making the removal amount δa of the cylinder inner peripheral surface specific corner portion larger than δb, it is possible to further reduce the occurrence of the remaining wear 110 at the corner portion of the cylinder inner surface.

  The cylinder inner peripheral surface specific corner portion 60 may be removed when the cylinder is molded or after the cylinder is molded.

  That is, the cylinder 30 is generally manufactured by so-called casting, in which a metal mold such as iron or aluminum alloy is poured into the mold, and the material is solidified and molded into a desired shape. However, a mold in which the cylinder inner peripheral surface specific corner portion 60 has been removed in advance may be created at the mold creation stage. Thereby, the cylinder 30 from which the cylinder inner peripheral surface specific corner portion 60 is removed is obtained in a state where the shape at the time of molding is maintained, and the processing efficiency is improved.

  Further, after the cylinder 30 is molded, the corners may be removed with a cutting tool such as a drill. In that case, using a drill that matches the taper of the target corner, one-pass processing (a method that passes the tool through the workpiece and performs processing from cutting to polishing in a single reciprocating operation) is efficient. Processing can be performed. The cylinder inner peripheral corners machined in this way coincide with the outer ring part of the tooth of the drill used for machining.

  In addition, the cylinder inner peripheral surface 30a may be chamfered over the entire circumference of the inner peripheral surface corner for the purpose of removing burrs after molding. In that case, even if the cylinder inner peripheral surface specific corner portion 60 described above has a larger chamfering amount than the other ranges, the same effect can be obtained.

  Furthermore, the shape of the corner portion of the cylinder inner peripheral surface to be removed is not limited to the tapered shape as shown in FIG. That is, as shown in FIG. 4B, the same effect can be obtained even if the cylinder inner peripheral surface specific corner portion 60 is processed to form a counterbore perpendicular to the cylinder inner peripheral surface.

  FIG. 5 is a cross-sectional view of the compressor 100 used in the vehicle air conditioning system, which is the second embodiment of the compressor of the present invention. Since the operation of the compressor 100 shown in the present embodiment is the same as that of the first embodiment, a detailed description of the operation is omitted.

  As part of improving the performance of the compressor, there is a case where the volume of the compression chamber in the suction stroke is increased in order to increase the suction efficiency. In particular, in the case where all of the fastening bolts 58a and 58b are arranged concentrically, the wall thickness between the bolt hole and the cylinder inner peripheral surface extends over the range of the suction stroke due to the volume expansion of the compression chamber. , Tend to be very thin. Therefore, in that range, the assembly deformation due to the fastening of the cylinder and the side block occurs more significantly. The second embodiment pays attention to this point, and the cylinder inner peripheral surface specific corner portion in the immediate vicinity of the four fastening bolts 58c (two on the front side block 24 side and two on the rear side block 18 side) existing in the refrigerant gas intake stroke. 60a is removed in advance. FIG. 5 shows only the rear side block 18 side.

  That is, in the present embodiment, the cylinder inner peripheral surface specific corner portion 60a closest to the fastening bolt 58c in the range of the suction stroke of the compressor 100 extends over the circumferential direction of the cylinder inner peripheral surface 30a. It is removed in a range approximately equal to the diameter.

  With such a structure, it is possible to prevent generation of remaining wear on the cylinder inner peripheral surface corner in the intake stroke range of the refrigerant gas, which has a particularly large assembling deformation. The remaining occurrence can be effectively prevented.

As described above, according to the compressor 100 of the second embodiment, the fastening bolt 58c between the cylinder 30 and the front side block 24 in the refrigerant gas suction stroke range in which the assembly deformation of the cylinder 30 is significantly generated, and The cylinder inner peripheral surface specific corner portion 60a closest to the fastening bolt 58c between the cylinder 30 and the rear side block 18 is removed in advance in a range substantially equal to the diameter of the fastening bolt 58c over the circumferential direction of the cylinder inner peripheral surface 30a. Therefore, it is possible to more effectively prevent the occurrence of remaining wear at the corners of the cylinder inner peripheral surface, thereby improving the durability of the compressor and processing range of the corners of the cylinder inner peripheral surface. However, since it is further restricted, the processing time and processing cost of the cylinder inner peripheral corner can be further reduced. Furthermore, since the removal range of the corner portion of the cylinder inner peripheral surface is limited to the suction stroke range, it is possible to prevent the refrigerant gas from leaking.

  It should be noted that the corner portion of the cylinder inner peripheral surface to be removed is not limited to the vicinity of the fastening bolt 58c, and may be the entire region of the suction stroke range of the refrigerant gas or a part thereof. By removing the corners in these ranges, the same effect as described above can be obtained.

12 Case 30 Cylinder 30a Cylinder inner peripheral surface 32 Compression chamber 34 Rotor 34a Rotor outer peripheral surface 36 Rotating shaft 38 Vane groove 40 Vane 40a Vane tip 40b Vane embedded side end 42 Vane back pressure space 58b Fastening bolt 60 Cylinder inner peripheral surface specific angle Part

Claims (8)

A rotor that rotates about the rotation axis integrally with the rotation shaft, a cylinder that surrounds the outer peripheral surface of the rotor, and a plurality of vane grooves formed on the surface of the rotor are accommodated in the vane grooves. A cylinder inner peripheral surface corner portion having a plurality of vanes installed so as to be able to appear and retracted, a front side block and a rear side block fastened to both ends of the cylinder, and in contact with a joint surface between the cylinder and the front side block And, among the cylinder inner peripheral surface corners that are in contact with the joint surface between the cylinder and the rear side block, assembly deformation due to the fastening of the cylinder and the front side block or the cylinder and the rear side block occurs . The cylinder and the front side block, and the cylinder and the rear side block DOO cylinder inner peripheral surface corner portions of the fastening bolts nearest to fixed, said cylinder and said front side block, or the cylinder and the no fastening assembly due to the deformation of the rear side block is generated, a range of other than the fastening bolts nearest A gas compressor characterized in that the gas compressor is removed larger than the corners of the cylinder inner peripheral surface. A rotor that rotates about the rotation axis integrally with the rotation shaft, a cylinder that surrounds the outer peripheral surface of the rotor, and a plurality of vane grooves formed on the surface of the rotor are accommodated in the vane grooves. A cylinder inner peripheral surface corner portion having a plurality of vanes installed so as to be able to appear and retracted, a front side block and a rear side block fastened to both ends of the cylinder, and in contact with a joint surface between the cylinder and the front side block Among the inner peripheral corners of the cylinder that are in contact with the joint surface between the cylinder and the rear side block, a gas that causes assembly deformation due to the fastening between the cylinder and the front side block or between the cylinder and the rear side block. The cylinder inner peripheral corner at a position corresponding to the suction stroke range of the cylinder and the front stroke The gas compressor is characterized in that it is removed larger than the corner of the cylinder inner peripheral surface in a range other than the range of the gas suction stroke, in which assembly deformation due to fastening of the block or the cylinder and the rear side block does not occur. . Among the cylinder inner peripheral surface corners, in a position corresponding to the suction stroke range of the gas, and the cylinder and the front side block, and the cylinder and the rear side block, fastening bolts of the nearest fixing the city Shi peripheral surface corner portion Linda, gas compression apparatus according to claim 1 or claim 2, characterized in that it is larger removed than the cylinder inner peripheral surface corners ranging else. Among the cylinder inner peripheral corners , a range substantially equal to the fastening bolt diameter along the circumferential direction of the cylinder inner peripheral corners is removed to be larger than the other cylinder inner peripheral corners. The gas compressor according to claim 1 or 3, characterized by the above. The gas compressor according to any one of claims 1 to 4, wherein the shape of the corner portion of the inner peripheral surface of the cylinder that is largely removed is a shape that is maintained at the time of cylinder molding. The shape of the cylinder inner peripheral surface corner being the larger removed, according to claims 1 to 4, characterized in that it is substantially matched shapes and contours wheels of the cutting teeth of the tool used for cutting Gas compressor. The larger cylinder inner peripheral surface corner is removed, to claims 1 to 6, characterized in that it is larger chamfered than shea cylinder inner peripheral surface corners outside the range that is the largely removed The gas compressor described. The larger removed by the cylinder inner peripheral surface corners are the joint surface between the cylinder and the front side block, and, in the direction perpendicular to the junction surface between the cylinder and the rear side block, said front side block The gas compressor according to any one of claims 1 to 7, wherein the gas compressor is removed to be larger than a clearance between the vane and the vane and a clearance between the rear side block and the vane.

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