JP2009281305A - Compressor - Google Patents

Abstract

An object of the present invention is to prevent seizure between a roller and upper and lower end surfaces of a cylinder chamber.
A front head 43, a cylinder and a rear head are fastened by five bolts 48a to 48e. The front muffler, the front head 43 and the cylinder are fastened by four bolts 49a to 49d. A recess 85 is formed on the upper surface of the front head 43 to facilitate the flow of the refrigerant that has flowed out of the cylinder chamber through the through hole 84. The recess 85 is disposed in the vicinity of the bolts 48a to 48c and the bolts 49a to 49c and extends to between the bolts 48a to 48c (between the bolts 49a to 49c). The diameters of the bolts 48b and 48c are smaller than the diameters of the bolts 48a, 48d and 48e, and the diameter of the bolt 49b is smaller than the diameters of the bolts 49a, 49c and 49d.
[Selection] Figure 2

Description

  The present invention relates to a compressor that compresses a refrigerant.

  In the compressor described in Patent Document 1, end plate portions are arranged at upper and lower ends of a cylinder in which a cylinder chamber is formed, and the cylinder and upper and lower end plate portions are fastened by a plurality of bolts. A muffler cover is disposed on the upper surface of the upper end plate portion, and the muffler chamber communicated with the cylinder chamber through the discharge hole formed in the end plate portion by the end plate portion and the muffler cover. Is formed. Further, a discharge valve is disposed on the upper surface of the upper end plate portion so as to close the discharge hole. When the roller moves in the cylinder chamber and the refrigerant is compressed, the pressure opens the discharge valve, and the refrigerant in the cylinder chamber flows into the muffler chamber. At this time, the upper surface of the upper end plate portion is formed with a recess in the portion where the discharge valve is disposed and the peripheral portion thereof, and the refrigerant discharged from the discharge hole flows along the recess and flows into the muffler chamber. Flow into.

JP 2007-255302 A

  However, in the compressor described in Patent Document 1, since the discharge hole and the concave portion are formed in the upper end plate portion, the rigidity of the upper end plate portion is lowered in the portion where the discharge hole and the concave portion are formed. is doing. Therefore, when the cylinder and the end plate portions arranged above and below it are fastened by a plurality of bolts, the portions near the discharge holes and the recesses of the upper end plate portion are deformed more than the other portions by the fastening force of the bolts. As a result, the height of the cylinder chamber is lower in this part than in other parts. As a result, there is a risk that the roller contacts the upper and lower end surfaces of the cylinder chamber and seizure occurs.

  The objective of this invention is providing the compressor which can prevent that a roller contacts the upper-lower-end surface of a cylinder chamber, and a baking generate | occur | produces.

  A compressor according to a first aspect of the present invention is disposed in a sealed space, and is disposed in a cylinder chamber in which a cylinder chamber for compressing a refrigerant is formed, and in the cylinder chamber. A roller that moves along a peripheral surface, a first partition member that defines one of an upper surface and a lower surface of the cylinder chamber, and a second partition member that defines the other of the upper surface and the lower surface of the cylinder chamber, The cylinder, the first partition member, and the second partition member are fastened by a plurality of first bolts arranged along the circumferential direction of the first partition member when viewed from above and below, and the first partition member Are vertically penetrating the first partition member, the discharge passage for discharging the refrigerant compressed in the cylinder chamber, and the surface of the first partition member on the side opposite to the cylinder, Discharge channel A recess formed in a portion including the opening, and of the plurality of first bolts, at least one of the first bolts disposed in the vicinity of the recess has a smaller diameter than the other first bolts. It is characterized by.

  In this compressor, since at least one of the first bolts arranged in the vicinity of the recess among the plurality of first bolts has a smaller diameter than the other first bolts, the first bolt in the vicinity of the recess. The fastening force is reduced, and the amount of deformation in this portion of the first partition member is reduced. As a result, the height of the cylinder chamber is prevented from becoming lower in this portion than in other portions, and it is possible to prevent the roller from contacting the upper and lower end surfaces of the cylinder chamber and causing seizure.

  A compressor according to a second invention is the compressor according to the first invention, wherein the plurality of first bolts includes two first bolts arranged adjacent to each other in the vicinity of the recess. The concave portion is disposed between the two first bolts with respect to the arrangement direction of the plurality of first bolts, and at least one of the two first bolts is more than the other first bolts. Is also characterized by a small diameter.

  The plurality of first bolts includes two first bolts disposed adjacent to each other in the vicinity of the recess, and the recess is disposed between the two first bolts in the arrangement direction of the plurality of first bolts. In this case, the portion in the vicinity of the concave portion of the first partition member is particularly easily deformed by the fastening force of these two first bolts. However, in this compressor, since the diameter of at least one of the two first bolts is smaller than that of the other first bolts, the fastening force of the first bolt in the portion near the recess is reduced, and the first The amount of deformation in this part of the partition member is reduced. This prevents the height of the cylinder chamber from becoming lower in this part than in other parts.

  A compressor according to a third invention is the compressor according to the first invention, wherein the plurality of first bolts includes three first bolts arranged adjacent to each other in the vicinity of the recess. And the recess extends between each of the three first bolts in the arrangement direction of the plurality of first bolts, and at least one of the three first bolts is more than the other first bolt. Is also characterized by a small diameter.

  The plurality of first bolts includes three first bolts arranged adjacent to each other in the vicinity of the recess, and the recess is between each of the three first bolts in the arrangement direction of the plurality of first bolts. In the case where the first partition member extends, the portion near the recess of the first partition member is particularly easily deformed by the fastening force of the three first bolts. However, in this compressor, since the diameter of at least one of these three first bolts is smaller than the other first bolts, the fastening force of the first bolts in the vicinity of the recesses is reduced, and the first The amount of deformation in this part of the partition member is reduced. This prevents the height of the cylinder chamber from becoming lower in this part than in other parts.

  A compressor according to a fourth aspect of the present invention further includes a muffler member that is disposed on a surface of the first partition member opposite to the cylinder and that forms a muffler space with the first partition member. And at least the first partition member and the muffler member are fastened by a plurality of second bolts arranged along a circumferential direction of the first partition member as viewed from above and below, and the plurality of second bolts Among these, at least one of the second bolts arranged in the vicinity of the concave portion has a smaller diameter than the other second bolts.

  In this compressor, among the plurality of second bolts that fasten at least the first partition member and the muffler member disposed on the surface opposite to the cylinder of the first partition member, the second bolt disposed in the vicinity of the recess. Since at least one of these has a smaller diameter than the other second bolts, the fastening force of the second bolts in the vicinity of the recesses is reduced, and the amount of deformation at this portion of the first partition member is reduced. As a result, the height of the cylinder chamber is prevented from becoming lower in this portion than in other portions, and it is possible to prevent the roller from contacting the upper and lower end surfaces of the cylinder chamber and causing seizure.

  A compressor according to a fifth invention is the compressor according to the fourth invention, wherein the plurality of second bolts include two second bolts arranged adjacent to each other in the vicinity of the recess. The concave portion is disposed between the two second bolts with respect to the arrangement direction of the plurality of second bolts, and at least one of the two second bolts is more than the other second bolt. Is also characterized by a small diameter.

  The plurality of second bolts includes two second bolts disposed adjacent to each other in the vicinity of the recess, and the recess is disposed between the two second bolts in the arrangement direction of the plurality of second bolts. In this case, the portion in the vicinity of the recess of the first partition member is particularly easily deformed by the fastening force of these two second bolts. However, in this compressor, since the diameter of at least one of these two second bolts is smaller than that of the other second bolts, the fastening force of the second bolt in the portion near the recess is reduced, and the first The amount of deformation in this part of the partition member is reduced. This prevents the height of the cylinder chamber from becoming lower in this part than in other parts.

  A compressor according to a sixth invention is the compressor according to the fourth invention, wherein the plurality of second bolts include three second bolts arranged adjacent to each other in the vicinity of the recess. The recess extends between each of the three second bolts with respect to the arrangement direction of the plurality of second bolts, and at least one of the three second bolts is more than the other second bolt. Is also characterized by a small diameter.

  The plurality of second bolts includes three second bolts arranged adjacent to each other in the vicinity of the recess, and the recess is between each of the three second bolts in the arrangement direction of the plurality of second bolts. In the case where the first partition member extends, the portion in the vicinity of the recess of the first partition member is particularly easily deformed by the fastening force of these three second bolts. However, in this compressor, since the diameter of at least one of these three second bolts is smaller than that of the other second bolts, the fastening force of the second bolt in the portion near the recess is reduced, and the first The amount of deformation in this part of the partition member is reduced. This prevents the height of the cylinder chamber from becoming lower in this part than in other parts.

  A compressor according to a seventh aspect of the present invention is disposed in a sealed space, and is disposed in a cylinder in which a cylinder chamber for compressing a refrigerant is formed, and in the cylinder chamber. A roller that moves along a peripheral surface; a first partition member that defines one of an upper surface and a lower surface of the cylinder chamber; a second partition member that defines the other of the upper surface and the lower surface of the cylinder chamber; and the first partition wall A muffler member disposed on a surface of the member opposite to the cylinder and forming a muffler space with the first partition member, wherein at least the first partition member and the muffler member are arranged in a vertical direction. As viewed, the first partition member is fastened by a plurality of bolts arranged along the circumferential direction of the partition member. The first partition member penetrates the first partition member in the vertical direction and is compressed in the cylinder chamber. A plurality of bolts, and a plurality of bolts, each having a discharge passage for discharging the refrigerant, and a recess formed in a portion of the surface of the first partition member opposite to the cylinder, including the opening of the discharge passage. Among these, at least one of the bolts arranged in the vicinity of the recess has a smaller diameter than the other bolts.

  In this compressor, at least one of the bolts arranged in the vicinity of the recess among the plurality of bolts that fasten at least the first partition member and the muffler member has a smaller diameter than the other bolts. The fastening force of the bolt in the vicinity of is reduced, and the deformation amount in this portion of the first partition member is reduced. As a result, the height of the cylinder chamber is prevented from becoming lower in this portion than in other portions, and it is possible to prevent the roller from contacting the upper and lower end surfaces of the cylinder chamber and causing seizure.

  A compressor according to an eighth invention is the compressor according to any one of the first to seventh inventions, wherein the refrigerant is carbon dioxide.

  In this compressor, since carbon dioxide is used as a refrigerant and the refrigerant is compressed to a particularly high pressure, the fastening force of the bolt becomes large, and the portion near the concave portion of the first partition member is easily deformed accordingly. By reducing the diameter of the bolt in the vicinity of the recess, the amount of deformation in the portion in the vicinity of the recess of the first partition member is reduced. This prevents the height of the cylinder chamber from becoming lower in this part than in other parts.

  As described above, according to the present invention, the following effects can be obtained.

  According to the first invention, among the plurality of first bolts, at least one of the first bolts arranged in the vicinity of the concave portion has a diameter smaller than that of the other first bolts. The fastening force of the first bolt is reduced, and the amount of deformation at this portion of the first partition member is reduced. As a result, the height of the cylinder chamber is prevented from becoming lower in this portion than in other portions, and it is possible to prevent the roller from contacting the upper and lower end surfaces of the cylinder chamber and causing seizure.

  According to the second invention, the plurality of first bolts include two first bolts arranged adjacent to each other in the vicinity of the recesses, and the recesses are related to the arrangement direction of the plurality of first bolts. In the case of being arranged between the two first bolts, the portion in the vicinity of the concave portion of the first partition member is particularly easily deformed by the fastening force of these two first bolts. However, since at least one of these two first bolts has a smaller diameter than the other first bolts, the fastening force of the first bolt in the portion near the recess is reduced, and this portion of the first partition member The amount of deformation at becomes smaller. This prevents the height of the cylinder chamber from becoming lower in this part than in other parts.

  According to the third invention, the plurality of first bolts include the three first bolts arranged adjacent to each other in the vicinity of the recesses, and the recesses are related to the arrangement direction of the plurality of first bolts. When extending between each of the first bolts, the portion in the vicinity of the concave portion of the first partition member is particularly easily deformed by the fastening force of the three first bolts. However, since at least one of the three first bolts has a smaller diameter than the other first bolts, the fastening force of the first bolt in the portion near the recess is reduced, and this portion of the first partition member The amount of deformation at becomes smaller. This prevents the height of the cylinder chamber from becoming lower in this part than in other parts.

  According to the fourth invention, among the plurality of second bolts that fasten at least the first partition member and the muffler member disposed on the surface opposite to the cylinder of the first partition member, the second partition bolt is disposed in the vicinity of the recess. Since at least one of the second bolts has a smaller diameter than the other second bolts, the fastening force of the second bolt in the vicinity of the recess is reduced, and the amount of deformation at this portion of the first partition member is reduced. . As a result, the height of the cylinder chamber is prevented from becoming lower in this portion than in other portions, and it is possible to prevent the roller from contacting the upper and lower end surfaces of the cylinder chamber and causing seizure.

  According to the fifth invention, the plurality of second bolts include two second bolts arranged adjacent to each other in the vicinity of the recesses, and the recesses are related to the arrangement direction of the plurality of second bolts. In the case of being arranged between the two second bolts, the portion in the vicinity of the concave portion of the first partition member is particularly easily deformed by the fastening force of the two second bolts. However, since at least one of these two second bolts has a smaller diameter than the other second bolts, the fastening force of the second bolt in the portion near the recess is reduced, and this portion of the first partition member The amount of deformation at becomes smaller. This prevents the height of the cylinder chamber from becoming lower in this part than in other parts.

  According to the sixth invention, the plurality of second bolts includes three second bolts arranged adjacent to each other in the vicinity of the recesses, and the recesses are related to the arrangement direction of the plurality of second bolts. When extending between each of the two second bolts, the portion in the vicinity of the recess of the first partition member is particularly easily deformed by the fastening force of these three second bolts. However, since at least one of these three second bolts has a smaller diameter than the other second bolts, the fastening force of the second bolt in the portion near the recess is reduced, and this portion of the first partition member The amount of deformation at becomes smaller. This prevents the height of the cylinder chamber from becoming lower in this part than in other parts.

  According to the seventh invention, at least one of the bolts arranged in the vicinity of the recess among the plurality of bolts that fasten at least the first partition member and the muffler member has a smaller diameter than the other bolts. Therefore, the fastening force of the bolt in the vicinity of the recess is reduced, and the amount of deformation at this portion of the first partition member is reduced. As a result, the height of the cylinder chamber is prevented from becoming lower in this portion than in other portions, and it is possible to prevent the roller from contacting the upper and lower end surfaces of the cylinder chamber and causing seizure.

  According to the eighth aspect of the invention, in the compressor using carbon dioxide as the refrigerant, since the refrigerant is compressed to a particularly high pressure, the fastening force of the bolt becomes large, and the portion in the vicinity of the recess of the first partition wall member accordingly. Although it becomes easy to deform | transform, by reducing the diameter of the volt | bolt near a recessed part, the deformation amount in the part near the recessed part of a 1st partition member becomes small. This prevents the height of the cylinder chamber from becoming lower in this part than in other parts.

  Hereinafter, preferred embodiments of the present invention will be described.

  FIG. 1 is a schematic configuration diagram of a compressor according to the present embodiment. FIG. 2 is a plan view of the cylinder 41 of FIG. FIG. 3 is a plan view of the front head 43 of FIG. 4 is a sectional view taken along line IV-IV in FIG. The compressor 1 is, for example, a compressor incorporated in a refrigeration cycle such as an air conditioner, and compresses carbon dioxide as a refrigerant from which moisture is removed, which is introduced from the suction pipe 2a, and is disposed at an upper end portion thereof. The compressed refrigerant is discharged from the discharge pipe 25. As shown in FIG. 1, the compressor 1 includes a casing 11, a motor 12, and a compression mechanism 13.

  The casing 11 includes a body 21, a top 22 and a bottom 23. The trunk | drum 21 is a substantially cylindrical member extended in the up-down direction, The upper and lower ends are opening. Further, a connection port 24 is formed on the side surface of the body 21 and connected to a suction pipe 2a for introducing a refrigerant from a refrigeration cycle (not shown) at the lower right end. The top 22 is a member that closes the opening at the upper end of the body 21. The top 22 is provided with the above-described discharge pipe 25. The bottom 23 is a member that closes the opening at the lower end of the body 21. In the casing 11, a sealed space 26 surrounded by the body 21, the top 22, and the bottom 23 is formed.

  The motor 12 is disposed in the sealed space 26 and has a stator 31 and a rotor 32. The stator 31 is fixed to the inner wall surface of the body 21 by, for example, shrinking swallow. The rotor 32 is disposed on the radially inner side of the stator 31, and an upper end portion of a shaft 60 extending in the vertical direction is fixed to a substantially central portion thereof. In the motor 12, the rotor 32 rotates together with the shaft 60 by the magnetic force generated between the stator 31 and the rotor 32. Note that the configuration of the stator 31 and the rotor 32 is the same as that of a conventional motor, and thus detailed description thereof is omitted here.

  The compression mechanism 13 is located below the motor 12 in the sealed space 26. As shown in FIG. 2, the compression mechanism 13 is a so-called oscillating piston type compression mechanism having a piston 42 in which a roller 42a and a blade 42b are integrally formed. As shown in FIG. A piston 42, a front head 43, a rear head 44, and a front muffler 45 are provided. The shaft 60 described above extends downward from the motor 12 and passes through the cylinder 41, the roller 42a, the front head 43, the rear head 44, and the front muffler 45. The compression mechanism 13 may be a rotary type compression mechanism in which the roller 42a and the blade are separated.

  The cylinder 41 is formed with a substantially circular cylinder chamber 71 at a substantially central portion thereof in a plan view penetrating the cylinder 41 in the vertical direction. Further, each cylinder 41 is connected to a cylinder chamber 71, and an introduction passage 72 extending from the cylinder chamber 71 to the right in FIG. 1 is formed, and the suction pipe 2 a connected to the connection port 24. Is connected to the introduction flow path 72. Thereby, the refrigerant introduced into the compressor 1 flows into the cylinder chamber 71 via the introduction flow path 72.

  Further, the cylinder 41 is formed with a blade storage chamber 75 that extends upward from the upper end in FIG. 2 of the cylinder chamber 71 and stores the blade 42b. The blade 42 b is slidably supported by a bush 73 disposed in the blade storage chamber 75.

  The roller 42a is disposed inside the cylinder chamber 71, and a substantially circular through hole 42c is formed at a substantially central portion thereof. The through hole 42 c is provided in the middle of the shaft 60 and is fitted with an eccentric portion 60 a that is eccentric with respect to the central axis of the shaft 60. When the shaft 60 rotates together with the eccentric portion 60a, the roller 42a moves along the inner peripheral surface of the cylinder chamber 71, and the blade 42b formed integrally with the roller 42a moves. The refrigerant in the chamber 71 is compressed. In addition, since the process in which the refrigerant | coolant in the cylinder chamber 71 is compressed by moving the piston 42 is the same as that of the conventional compressor, the detailed description is abbreviate | omitted here.

  The front head 43 (first partition member) is disposed on the upper surface of the cylinder 41 and includes a fastening portion 81 and a bearing portion 82. The fastening part 81 is a part fastened to the cylinder 41, and the upper surface of the cylinder chamber 71 is defined by the fastening part 81. Moreover, the fastening part 81 is being fixed to the fuselage | body 21 by welding etc., for example.

  The fastening portion 81 is formed with a through hole 84 and a recess 85. The through-hole 84 (discharge flow path) penetrates the fastening portion 81 in the vertical direction, and communicates the cylinder chamber 71 with a muffler space 76 described later. The concave portion 85 extends from the portion facing the through hole 84 in a plan view on the upper surface of the fastening portion 81 so as to widen to the upper right in FIG. 2 and from the portion facing the through hole 84 in FIG. It extends with a substantially constant width to the lower left.

  In the recess 85, a valve member 86 is disposed in a portion extending from the portion facing the through hole 84 to the lower left in FIG. The valve member 86 has elasticity, and its one end (upper right end in FIG. 2) closes the through hole 84, and the other end (left lower end in FIG. 2) is recessed by a rivet 86a or the like. It is fixed to the bottom surface of 85.

  And when the pressure of the refrigerant | coolant in the cylinder chamber 71 becomes more than predetermined, the valve member 86 will raise this part by pressing the part which has blocked the through-hole 84 with the pressure of the refrigerant | coolant upwards. The cylinder chamber 71 and the muffler space 76 communicate with each other. Thereby, the refrigerant compressed in the cylinder chamber 71 is discharged to the muffler space 76. At this time, the concave portion 85 is formed on the upper surface of the fastening portion 81, and the refrigerant flowing out of the through hole 84 flows through the concave portion 85 and into the muffler space 76, so that the refrigerant in the cylinder chamber 71 easily flows into the muffler space 76. .

  The bearing portion 82 extends upward from a substantially central portion of the fastening portion 81, and a through hole 82a for allowing the shaft to pass therethrough is formed. Thereby, the shaft 60 which penetrates the through-hole 82a is rotatably supported by the bearing portion 82.

  The rear head 44 (second partition member) is disposed on the lower surface of the cylinder 41 and defines the lower surface of the cylinder chamber 71.

  The front muffler 45 (muffler member) is disposed on the upper surface of the front head 43 (the surface opposite to the cylinder 41), and a muffler space 76 is formed in a portion surrounded by the front muffler 45 and the front head 43. Yes. As described above, the muffler space 76 communicates with the cylinder chamber 71 via the through hole 84 and also communicates with the sealed space 26. The refrigerant discharged from the cylinder chamber 71 is discharged into the sealed space 26 after noise in the muffler space 76 is reduced.

  Here, in the compressor 1, the front head 43, the cylinder 41, and the rear head 44 described above are provided with five bolts 48 (bolts 48 a to 48 e) inserted from below the rear head 44 as shown in FIGS. 1 and 2. The front muffler 45, the front head 43, and the cylinder 41 are fastened by four bolts 49 (bolts 49a to 49d, second bolts) inserted from above the front muffler 45. ing.

  The five bolts 48 are arranged along the circumferential direction of the front head 43 in a plan view (viewed from the vertical direction), and among these, three bolts 48a to 48c are arranged in the vicinity of the recess 85. At the same time, the other two bolts 48d and 48e are arranged farther from the recess 85 than the bolts 48a to 48c. And the volt | bolt 48b and 48c which are two of the volt | bolts 48a-48c arrange | positioned in the vicinity of the recessed part 85 are smaller in diameter than the volt | bolts 48a, 48d, and 48e.

  The four bolts 49 are arranged along the circumferential direction of the front head 43 in a plan view. Among these bolts, three bolts 49a to 49c are arranged in the vicinity of the recess 85, and the other bolts 49d. Is arranged farther from the recess 85 than the bolts 49a to 49c. And the volt | bolt 49b which is one of the volt | bolts 49a-49c arrange | positioned in the vicinity of the recessed part 85 is smaller in diameter than the volt | bolts 49a, 49c, and 49d.

  Further, in the recess 85 described above, the portion extending from the portion facing the through hole 84 to the lower left in FIG. 2 is the bolt 48a in the circumferential direction of the front head 43 (arrangement direction of the bolts 48a to 48e, 49a to 49d). 2 to 48e extending between the bolts 48a and 48b adjacent to each other (between the bolts 49a to 49d adjacent to each other among the bolts 49a to 49d) and facing the through hole 84 in FIG. In the circumferential direction of the front head 43, the portion of the bolts 48a to 48e is adjacent to the bolts 48b and 48c adjacent to each other (the bolts 49b to 49c adjacent to each other among the bolts 49a to 49d). Between). Further, the blade storage chamber 75 described above also extends between the bolt 48b and the bolt 48c (between the bolt 49b and the bolt 49c).

  Here, the rigidity of the front head 43 is lower in the portion where the through hole 84 and the concave portion 85 are formed than in other portions. Therefore, unlike the present embodiment, the bolts 48a to 48e have the same diameter, and the bolts 48a to 48e are used to fasten the front head 43, the cylinder 41, and the rear head 44, and all the bolts 49a to 49d have the same diameter. In the same manner, when the front muffler 45, the front head 43, and the cylinder 41 are fastened by the bolts 49a to 49d, the front head 43 is deformed more greatly in the vicinity of the through hole 84 and the recessed portion 85 than the other portions. Resulting in. As a result, the height of the cylinder chamber 71 is reduced in the vicinity of the through hole 84 and the recess 85, and when the compressor 1 is driven, the roller 42a contacts the upper surface and the lower surface of the cylinder chamber 71 and seizure occurs. There is a risk of it.

  Furthermore, in this embodiment, as described above, the recess 85 is provided between the bolt 48a and the bolt 48b (between the bolt 49a and the bolt 49b) and between the bolt 48b and the bolt 48c (the bolt 49b and the bolt 48b). 49b), the deformation in the portion near the through hole 84 and the recess 85 of the front head 43 due to the fastening force of the bolts 48a to 48c and the bolts 49a to 49c becomes particularly large.

  In addition, in the compressor 1, carbon dioxide is used as the refrigerant. Since the refrigerant is compressed to a particularly high pressure in the cylinder chamber 71, the bolts 48a to 48e and 49a to 49d are fastened to withstand this. The force is particularly large, and the portion near the through hole 84 and the recess 85 of the front head 43 is greatly deformed accordingly.

  However, in the present embodiment, the diameters of the bolts 48b and 48c, which are two of the three bolts 48a to 48c arranged in the vicinity of the recess 85, are made smaller than the diameters of the bolts 48a, 48d and 48e, Since the diameter of the bolt 49b, which is one of the three bolts 49a to 49c arranged in the vicinity of the recess 85, is smaller than the diameter of the bolts 49a, 49c, 49d, the fastening force by the bolts 48b, 48c Is smaller than the fastening force of the bolts 48a, 48d, and 48e, and the fastening force of the bolt 49b is smaller than the fastening force of the bolts 49a, 49c, and 49d, and the vicinity of the through hole 84 and the recess 85 of the front head 43 is reduced. The amount of deformation in the portion is reduced. As a result, the height of the cylinder chamber 71 is prevented from becoming lower than the other portions in the vicinity of the through hole 84 and the recess 85, and the roller 42 a comes into contact with the upper surface and the lower surface of the cylinder chamber 71 and seizure occurs. Is prevented.

  Further, in the compression mechanism 13 having the piston 42 in which the roller 42a and the blade 42b are integrated as described above, the blade 42b moves as the roller 42a moves along the inner peripheral surface of the cylinder chamber 71. Since the blade moves not only in the vertical direction but also in the horizontal direction, as described above, the blade housing chamber 75 requires the bush 73 for slidably supporting the blade 42b. Therefore, the roller 42a and the blade 42b are separated, and when the roller 42a moves along the inner peripheral surface of the cylinder chamber 71, the blade 42b moves only in the vertical direction. Compared with the compression mechanism of the mold, in such a compression mechanism 13, it is necessary to enlarge the blade storage chamber 75 by the amount of the bush 73.

  When the blade storage chamber 75 is enlarged, the rigidity of the cylinder 41 in the vicinity of the blade storage chamber 75 is reduced accordingly, so that all the bolts 48a to 48e have the same diameter and all the bolts 49a to 49d have the same diameter. Then, when each member of the compression mechanism 13 is fastened by the bolts 48a to 48e and the bolts 49a to 49d, the cylinder 41 is deformed more greatly in the portion near the blade storage chamber 75 than in the other portions. There is a possibility that the height of the cylinder chamber 71 is lowered, and the roller 42 a comes into contact with the upper surface and the lower surface of the cylinder chamber 71 and seizure occurs.

  Further, as the portion of the cylinder 41 near the blade storage chamber 75 is deformed, the portion of the cylinder 41 that becomes the wall of the blade storage chamber 75 is deformed so as to enter the inside of the blade storage chamber 75. The chamber 75 is pressed by a large load, and seizure occurs between the bush 73 and the wall surface of the blade storage chamber 75 due to friction between the bush 73 and the wall surface of the blade storage chamber 75 when the blade 42b moves. There is a risk of it.

  However, in the present embodiment, of the bolts 48a to 48e, the diameters of the two bolts 48b and 48c that are adjacent to each other in a plan view and sandwich the blade storage chamber 75 are the same as the bolts 48a, 48d, Since the diameter of the bolt 49b disposed in the vicinity of the blade storage chamber 75 is smaller than the diameter of the bolt 49a, 49c, 49d, the fastening force of the bolt in the vicinity of the blade storage chamber 75 is reduced. The height of the cylinder chamber 71 does not decrease in the vicinity of the blade storage chamber 75 of 41, and the occurrence of seizure between the roller 42a and the upper and lower end surfaces of the cylinder chamber 71 can be prevented. .

  Further, as the deformation of the portion of the cylinder 41 near the blade storage chamber 75 becomes smaller, the amount of deformation so that the portion of the cylinder 41 that becomes the wall of the blade storage chamber 75 enters the inside of the blade storage chamber 75 becomes smaller. Therefore, it is possible to prevent baking from occurring between the bush 73 and the wall surface of the blade storage chamber 75.

  As described above, in the compressor 1 according to the present invention, the rigidity of the front head 43 is lower in the portion where the through hole 84 and the recess 85 are formed than in other portions. Therefore, unlike the present embodiment, the bolts 48a to 48e have the same diameter, and the bolts 48a to 48e are used to fasten the front head 43, the cylinder 41, and the rear head 44, and the bolts 49a to 49d have the same diameter. Thus, when the front muffler 45, the front head 43, and the cylinder 41 are fastened by the bolts 49a to 49d, the front head 43 is deformed to a greater extent in the vicinity of the through hole 84 and the recess 85 than in other portions. End up. As a result, the height of the cylinder chamber 71 decreases in the vicinity of the through hole 84 and the recess 85, and when the compressor 1 is driven, the roller 42 a comes into contact with the upper and lower surfaces of the cylinder chamber 71 and seizure occurs. There is a risk of it.

  Furthermore, in this embodiment, as described above, the recess 85 is provided between the bolt 48a and the bolt 48b (between the bolt 49a and the bolt 49b) and between the bolt 48b and the bolt 48c (the bolt 49b and the bolt 48b). 49b), the deformation in the vicinity of the through hole 84 and the recess 85 of the front head 43 due to the fastening force of the bolts 48a to 48c and 49a to 49c becomes particularly large.

  In addition, in the compressor 1, carbon dioxide is used as the refrigerant. Since the refrigerant is compressed to a particularly high pressure in the cylinder chamber 71, the bolts 48a to 48e and 49a to 49d are fastened to withstand this. The force is particularly large, and the portion near the through hole 84 and the recess 85 of the front head 43 is greatly deformed accordingly.

  However, in the present embodiment, the diameters of the bolts 48b and 48c, which are two of the three bolts 48a to 48c arranged in the vicinity of the recess 85, are made smaller than the diameters of the bolts 48a, 48d and 48e. Therefore, the fastening force by the bolts 48b and 48c is smaller than the fastening force of the bolts 48a, 48d and 48e. Furthermore, since the diameter of the bolt 49b, which is one of the three bolts 49a to 49c arranged in the vicinity of the recess 85, is smaller than the diameter of the bolts 49a, 49c, 49d, the fastening force by the bolt 49b However, it becomes smaller than the fastening force of the bolts 49a, 49c, and 49d. As a result, the amount of deformation in the vicinity of the through hole 84 and the recess 85 of the front head 43 is reduced. As a result, the height of the cylinder chamber 71 is prevented from becoming lower than the other portions in the vicinity of the through hole 84 and the recess 85, and the roller 42 a comes into contact with the upper surface and the lower surface of the cylinder chamber 71 and seizure occurs. Is prevented.

  Further, in the compression mechanism 13 having the piston 42 in which the roller 42a and the blade 42b are integrated as described above, the blade 42b moves as the roller 42a moves along the inner peripheral surface of the cylinder chamber 71. Since the blade moves not only in the vertical direction but also in the horizontal direction, as described above, the blade housing chamber 75 requires the bush 73 for slidably supporting the blade 42b. Therefore, the roller 42a and the blade 42b are separated, and when the roller 42a moves along the inner peripheral surface of the cylinder chamber 71, the blade 42b moves only in the vertical direction. Compared with the compression mechanism of the mold, in such a compression mechanism 13, it is necessary to enlarge the blade storage chamber 75 by the amount of the bush 73.

  When the blade storage chamber 75 is enlarged, the rigidity of the cylinder 41 in the vicinity of the blade storage chamber 75 is reduced accordingly, so that all the bolts 48a to 48e have the same diameter and all the bolts 49a to 49d have the same diameter. Then, when each member of the compression mechanism 13 is fastened by the bolts 48a to 48e and the bolts 49a to 49d, the cylinder 41 is deformed more greatly in the portion near the blade storage chamber 75 than in the other portions. There is a possibility that the height of the cylinder chamber 71 is lowered, and the roller 42 a comes into contact with the upper surface and the lower surface of the cylinder chamber 71 and seizure occurs.

  Further, as the portion of the cylinder 41 near the blade storage chamber 75 is deformed, the portion of the cylinder 41 that becomes the wall of the blade storage chamber 75 is deformed so as to enter the inside of the blade storage chamber 75. The chamber 75 is pressed by a large load, and seizure occurs between the bush 73 and the wall surface of the blade storage chamber 75 due to friction between the bush 73 and the wall surface of the blade storage chamber 75 when the blade 42b moves. There is a risk of it.

  However, in the present embodiment, of the bolts 48a to 48e, the diameters of the two bolts 48b and 48c that are adjacent to each other in a plan view and sandwich the blade storage chamber 75 are the same as the bolts 48a, 48d, Since the diameter of the bolt 49b disposed in the vicinity of the blade storage chamber 75 is smaller than the diameter of the bolt 49a, 49c, 49d, the fastening force of the bolt in the vicinity of the blade storage chamber 75 is reduced. The height of the cylinder chamber 71 does not decrease in the vicinity of the blade storage chamber 75 of 41, and the occurrence of seizure between the roller 42a and the upper and lower end surfaces of the cylinder chamber 71 can be prevented. .

  Further, as the deformation of the portion of the cylinder 41 near the blade storage chamber 75 becomes smaller, the amount of deformation so that the portion of the cylinder 41 that becomes the wall of the blade storage chamber 75 enters the inside of the blade storage chamber 75 becomes smaller. Therefore, it is possible to prevent baking from occurring between the bush 73 and the wall surface of the blade storage chamber 75.

  As mentioned above, although embodiment of this invention was described based on drawing, specific structure is not restricted to these embodiment, It can change in the range which does not deviate from the summary of invention.

  In the above-described embodiment, the diameters of the bolts 48b and 48c, which are the two bolts 48a to 48c for fastening the front head 43, the cylinder 41, and the rear head 44, arranged in the vicinity of the through hole 84 and the recess 85 are set. One of bolts 49 a to 49 c for fastening the front muffler 45, the front head 43 and the cylinder 4, which is smaller than the diameters of the bolts 48 a, 48 d and 48 e and which is disposed in the vicinity of the through hole 84 and the recess 85. Although the diameter of a certain bolt 49b is made smaller than the diameter of the bolts 49a, 49c, and 49d, the present invention is not limited to this. In one modification, as shown in FIG. 5, the diameters of the bolts 48b and 48c, which are two of the bolts 48a to 48c, are smaller than the diameters of the bolts 48a, 48d and 48e, as in the above-described embodiment. However, the diameters of the bolts 49a to 49d are almost the same (Modification 1).

  Even in this case, the diameters of the bolts 48b and 48c, which are two of the three bolts 48a to 48c arranged in the vicinity of the recess 85, are smaller than the diameters of the bolts 48a, 48d and 48e. The fastening force by 48b, 48c becomes smaller than the fastening force of the bolts 48a, 48d, 48e, and the deformation amount in the vicinity of the through hole 84 and the recess 85 of the front head 43 becomes small. As a result, the height of the cylinder chamber 71 is prevented from becoming lower than the other portions in the vicinity of the through hole 84 and the recess 85, and the roller 42 a comes into contact with the upper surface and the lower surface of the cylinder chamber 71 and seizure occurs. Is prevented.

  Even in this case, the diameters of the bolts 48b and 48c that are adjacent to each other and sandwich the blade storage chamber 75 are smaller than the diameters of the bolts 48a, 48d, and 48e in plan view. The fastening force of the bolt in the vicinity of the blade storage chamber 75 is reduced, and the height of the cylinder chamber 71 does not decrease in the portion in the vicinity of the blade storage chamber 75 of the cylinder 41. It is possible to prevent seizure between the two.

  Further, as the deformation of the portion of the cylinder 41 near the blade storage chamber 75 becomes smaller, the amount of deformation so that the portion of the cylinder 41 that becomes the wall of the blade storage chamber 75 enters the inside of the blade storage chamber 75 becomes smaller. Therefore, it is possible to prevent baking from occurring between the bush 73 and the wall surface of the blade storage chamber 75.

  In the above-described embodiment and the first modification, the bolts 48 a to 48 c are disposed near the through hole 84 and the recess 85 and fasten the front head 43, the cylinder 41, and the rear head 44. The diameters of the bolts 48b and 48c were smaller than the diameters of the bolts 48a, 48d and 48e. However, the diameter is not limited to this, and at least one of the bolts 48a to 48c arranged in the vicinity of the recess 85 has a diameter. It only needs to be smaller than other bolts.

  Moreover, in another modification, as shown in FIG. 6, among the bolts 49a to 49c, the diameters of the bolts 49b and 49c are smaller than the diameter of the bolt 49a, as in the above-described embodiment. The diameters of the bolts 48a to 48e are almost the same (Modification 2).

  Even in this case, among the three bolts 49a to 49c arranged in the vicinity of the recess 85, the bolts 49b and 49c are smaller in diameter than the bolts 49a and 49d. However, it becomes smaller than the fastening force of the bolts 49a and 49d, and the amount of deformation in the vicinity of the through hole 84 and the recess 85 of the front head 43 becomes small. As a result, the height of the cylinder chamber 71 is prevented from becoming lower than the other portions in the vicinity of the through hole 84 and the recess 85, and the roller 42 a comes into contact with the upper surface and the lower surface of the cylinder chamber 71 and seizure occurs. Is prevented.

  In this case, among the bolts 49a to 49c, the diameters of the bolts 49b and 49c that are adjacent to each other in plan view and sandwich the blade storage chamber 75 (see FIG. 2) are Since the diameter is smaller than the diameter, the cylinder 41 is prevented from being greatly deformed in the blade housing chamber 75 than the other portions, and the upper and lower end surfaces of the roller 42a and the cylinder chamber 71 are the same as described above. , And between the bush 73 and the wall surface of the blade storage chamber 75 is prevented from being seized.

  In the above-described embodiment and the second modification, the bolts 49a to 49c are arranged near the through hole 84 and the recess 85, and fasten the front muffler 45, the front head 43, and the cylinder 41 with two of them. The diameter of a certain bolt 49b, 49c is smaller than the diameter of the bolt 49a, 49d. However, the diameter is not limited to this, and at least one of the bolts 49a-49c arranged in the vicinity of the recess 85 is the other diameter. It only needs to be smaller than the bolt.

  Further, in the above-described embodiment, the three bolts 48a to 48c (first bolt) and the three bolts 49a to 49c (second bolt) are disposed in the vicinity of the recess 85, and the recess 85 serves as the front head. Although it extended to between each of the three bolts 48a to 48c adjacent to each other in the circumferential direction of 43 (between each of the three bolts 49a to 49c), it is not limited thereto.

  In another modification, as shown in FIG. 7, the bolts 48b and 49b (see FIG. 2) in the above-described embodiment are not provided, and the front head 43, the cylinder 41, and the rear head 44 have four bolts. The front muffler 45, the front head 43, and the cylinder 41 are fastened by three bolts 49a, 49c, and 49d while being fastened by 48a, 48c to 48e. The recess 85 extends to a portion between the bolts 48a and 48c (between the bolt 49a and the bolt 49c) arranged adjacent to each other in the circumferential direction of the front head 43. Further, the diameter of the bolt 48c is smaller than the diameters of the bolts 48a, 48d, and 48e, and the diameter of the bolt 49a is smaller than the diameters of the bolts 49c and 49d (Modification 3).

  In this case, the bolts 48a, 48c, 49a, 49c are arranged in the vicinity of the through hole 84 and the recess 85, and the recess 85 is located between the bolt 48a and the bolt 48c in the circumferential direction of the front head 43 (the bolt 49b and 48c), the bolts 48a, 48c to 48e all have the same diameter, and the bolts 49a, 49c, 49d all have the same diameter. 84 and the portion near the recess 85 are deformed more greatly than other portions. As a result, the height of the cylinder chamber 71 decreases in the vicinity of the through hole 84 and the recess 85, and when the compressor is driven, the roller 42a comes into contact with the upper and lower surfaces of the cylinder chamber 71 and seizure occurs. There is a fear.

  However, in the third modification, the diameter of the bolt 48c, which is one of the bolts 48a and 48c arranged in the vicinity of the through hole 84 and the recess 85, is made smaller than the diameter of the bolts 48a, 48d and 48e. In addition, since the diameter of the bolt 49a which is one of the bolts 49a and 49c arranged in the vicinity of the through hole 84 and the recess 85 is smaller than the diameter of the bolts 49c and 49d, the through hole of the front head 43 is provided. The amount of deformation in the vicinity of 84 and the recess 85 is reduced. As a result, the height of the cylinder chamber 71 is prevented from being lower than the other portions in the vicinity of the through hole 84 and the recess 85, and the roller 42a contacts the upper surface and the lower surface of the cylinder chamber 71 to cause seizure. Is prevented.

  In the third modification, the diameter of the bolt 48c is smaller than the diameters of the bolts 48a, 48d, and 48e. Conversely, the diameter of the bolt 48a is smaller than the diameters of the bolts 48c to 48e. It may be. Alternatively, both the diameters of the bolts 48a and 48c may be smaller than the diameter of the bolt 48d.

  In the third modification, the diameter of the bolt 49a is smaller than the diameter of the bolts 49c and 49d. Conversely, the diameter of the bolt 49c is smaller than the diameter of the bolts 49a and 49d. Also good. Alternatively, both the diameters of the bolts 49a and 49c may be smaller than the diameter of the bolt 49d.

  Moreover, in the modification 3, although it was the structure by which the volt | bolt 48b was not provided among the volt | bolts 48a-48c arrange | positioned in the vicinity of the through-hole 84 and the recessed part 85 in the above-mentioned embodiment, Instead, a configuration in which the bolt 48a or the bolt 48c is not provided may be employed.

  Moreover, in the modification 3, it was the structure in which the volt | bolt 49b was not provided among the volt | bolts 49a-49c arrange | positioned in the vicinity of the through-hole 84 and the recessed part 85 in the above-mentioned embodiment, Instead, a configuration in which the bolt 49a or the bolt 49c is not provided may be employed.

  In the above-described embodiment, the compressor 1 has only one cylinder 41. However, the present invention is not limited to this. In another modification, as shown in FIG. 8, in addition to the same configuration as that of the above-described embodiment, a middle plate 91 and a cylinder 92 are arranged in order from the top between the cylinder 41 and the rear head 104 in the vertical direction. Is arranged. A rear muffler 103 is disposed on the lower surface of the rear head 104 (on the surface opposite to the cylinder 41), and a muffler space 105 is formed between the rear head 104 and the rear muffler 103 (Modification 4).

  Similar to the cylinder 41, the cylinder 92 has a cylinder chamber 71 and an introduction flow path 72. The middle plate 91 defines the lower surface of the cylinder chamber 71 of the cylinder 41 and the upper surface of the cylinder chamber 71 of the cylinder 92. In this case, the rear head 104 defines the lower surface of the cylinder chamber 71 of the cylinder 92. The bolt 48 is longer than that of the above-described embodiment, and fastens the front head 43, the cylinder 41, the middle plate 91, the cylinder 92, the rear head 104, and the rear muffler 103. The rear head 44 and the cylinder 92 are fastened by a bolt 93 different from the bolts 48 and 49. Further, in this case, corresponding to the provision of the two cylinders 41 and 92, two connecting ports 24 are formed in the body 21, and two suction pipes 2a are provided. The shaft 60 includes two eccentric portions 60a corresponding to the rollers 42a and 102 disposed in the cylinder chambers 71 and 101 of the two cylinders 41 and 92, respectively.

  In this case, there are two combinations according to the present invention. In the first combination, the upper cylinder 41 corresponds to the cylinder according to the present invention, and the front head 43 defining the upper surface of the cylinder chamber 71 of the cylinder 41 is The middle plate 91 defining the lower surface corresponds to the first partition member according to the present invention and corresponds to the first partition member according to the present invention. In the second combination, the lower cylinder 92 corresponds to the cylinder according to the present invention, and the middle plate 91 defining the upper surface of the cylinder chamber 101 of the cylinder 92 corresponds to the second partition member according to the present invention. The rear head 104 that defines the lower surface of the cylinder chamber 101 of the cylinder 92 corresponds to the first partition member according to the present invention.

  FIG. 9 is a plan view showing the lower surface of the rear head 104 of FIG. As shown in FIGS. 8 and 9, the rear head 104 is formed with a through hole 106 (discharge channel), a recess 107 and a through hole 108. The through hole 106 is disposed at a position overlapping the through hole 84 in plan view, and penetrates the rear head 104 in the vertical direction.

  The recess 107 is formed in a portion of the lower surface of the rear head 104 that overlaps the recess 85 in plan view, and from the portion near the lower end of this portion, the rear head 104 is shown along the circumferential direction of the rear head 104. 9 extends to the lower right end, and is wider at the tip. A valve member 86 similar to that disposed in the recessed portion 85 is disposed on the bottom surface of the recessed portion 107, and the roller 102 (piston) disposed in the lower cylinder chamber 101 is compressed by moving. When the refrigerant in the cylinder chamber 101 reaches a predetermined pressure or more, the cylinder chamber 101 and the muffler space 105 are elastically deformed so that the portion blocking the through hole 106 of the valve member 86 is pushed downward. The refrigerant compressed in the cylinder chamber 101 flows through the recess 107 and flows into the muffler space 105.

  The through hole 108 is formed in a portion where the width at the lower end portion of the concave portion 107 is wide, and penetrates the rear head 104 in the vertical direction. Further, similar through holes (not shown) are formed at positions overlapping the cylinders 41 and 92 disposed above the rear head 104 and the through holes 108 of the middle plate 91, and through these through holes, The refrigerant in the muffler space 105 flows into the muffler space 76.

  Even in this case, as in the above-described embodiment, at least one of the bolts 48 (the bolts 48a to 48c in FIG. 9) arranged in the vicinity of the recess 85 (see FIG. 3) and the bolt 49 By making at least one diameter smaller than the diameter of the other bolt 48 and the other bolt 49, respectively, the amount of deformation in the portion near the through hole 84 and the recess 85 of the front head 43 is reduced. As a result, the height of the cylinder chamber 71 is prevented from becoming lower than the other portions in the vicinity of the through hole 84 and the recess 85, and the roller 42 a comes into contact with the upper surface and the lower surface of the cylinder chamber 71 and seizure occurs. Is prevented.

  Similarly, the diameter of at least one of the bolts 48 arranged in the vicinity of the recess 107 (the bolts 48a to 48c in FIG. 9) is made smaller than the diameters of the other bolts 48, so that the through hole of the rear head 104 is obtained. The amount of deformation in the portion near 106 and the recess 107 becomes small. As a result, the height of the cylinder chamber 101 is prevented from being lower than the other portions in the vicinity of the through hole 106 and the recess 107, and the roller 102 comes into contact with the upper surface and the lower surface of the cylinder chamber 101 and seizure occurs. Is prevented.

  In this case, since the recess 107 extends to between the bolt 48a and the bolt 48e, when the diameter of the bolt 48e is reduced, the height of the cylinder chamber 101 is different as described above. It is possible to prevent the roller 102 from coming into contact with the upper surface and the lower surface of the cylinder chamber 101 and causing seizure.

  In the case where the compressor 1 has two cylinders, as shown in FIG. 8, the refrigerant may be introduced into each cylinder chamber in parallel from the refrigeration cycle, the refrigerant is introduced into the lower cylinder chamber, It is good also as what is called a two-stage compression type which introduce | transduces the refrigerant | coolant compressed in this cylinder chamber into an upper cylinder chamber, and further compresses a refrigerant | coolant in this cylinder chamber.

  Further, the position and number of bolts (first bolts) for fastening the front head 43, the cylinders 41 and 92, the middle plate 91, the rear head 44, and the rear muffler 103, and the front muffler 45, the front head 43, and the cylinder 41 are fastened. The position and number of bolts (second bolts) are such that at least one diameter of the first bolt disposed in the vicinity of the through hole 84 and the recess 85 is smaller than the diameter of the other first bolt, As long as at least one diameter of the second bolt arranged in the vicinity of the recess 85 is smaller than the diameter of the other second bolt, or both, it is different from the above. Also good.

  Even in this case, if all the first bolts have the same diameter and all the second bolts have the same diameter, the portion near the through hole 84 and the recess 85 of the front head 43 is larger than the other portions. Due to the deformation, the height of the cylinder chamber 71 is lowered in this portion, and as a result, there is a possibility that seizure occurs between the roller 42 a and the upper and lower end surfaces of the cylinder chamber 71.

  However, the second bolt disposed in the vicinity of the through hole 84 and the recess 85 that makes the diameter of at least one of the first bolts disposed in the vicinity of the through hole 84 and the recess 85 smaller than the diameter of the other first bolt. By making at least one of the diameters smaller than the diameters of the other second bolts, or both, it is possible to prevent the portions near the through holes 84 and the recesses 85 of the front head 43 from being greatly deformed. it can.

  In the above-described embodiment, the bolt 49 (second bolt) fastens the front muffler 45, the front head 43, and the cylinder 41. However, the bolt 49 fastens only the front muffler 45 and the front head 43. It may be.

  In the above-described embodiment, carbon dioxide is used as the refrigerant. However, the present invention can also be applied to a compressor using a refrigerant other than carbon dioxide.

  By utilizing the present invention, the amount of deformation in this portion of the first partition member in the vicinity of the recess is reduced, and as a result, the height of the cylinder chamber in this portion of the first partition member is lower than in other portions. It is possible to prevent the roller from coming into contact with the upper and lower end surfaces of the cylinder chamber and causing seizure.

It is a schematic block diagram of the compressor which concerns on embodiment in this invention. It is a top view of the cylinder of FIG. It is a top view which shows the upper surface of the front head of FIG. It is the IV-IV sectional view taken on the line of FIG. FIG. 10 is a diagram corresponding to FIG. FIG. 10 is a diagram corresponding to FIG. FIG. 10 is a diagram corresponding to FIG. FIG. 10 is a diagram corresponding to FIG. It is a top view of the rear head of FIG.

Explanation of symbols

1 Compressor 26 Sealed Space 41 Cylinder 42a Roller 43 Front Head 44 Rear Head 45 Front Muffler 48 Bolt 49 Bolt 71 Cylinder Chamber 84 Through Hole 85 Recess 91 Middle Plate 92 Cylinder 101 Cylinder Chamber 102 Roller 104 Rear Head

Claims (8)

Cylinders (41, 92) disposed in the sealed space (26) and formed with cylinder chambers (71, 101) for compressing the refrigerant;
Rollers (42, 102) disposed inside the cylinder chamber (71, 101) and moving along the inner peripheral surface of the cylinder chamber (71, 101);
A first partition member (43, 104) defining one of an upper surface and a lower surface of the cylinder chamber (71, 101);
A second partition member (44, 91) defining the other of the upper surface and the lower surface of the cylinder chamber (71, 101),
At least the cylinder (41, 92), the first partition member (43, 104), and the second partition member (44, 91) are circumferential directions of the first partition member (43, 104) when viewed from above and below. Are fastened by a plurality of first bolts (48) arranged along
The first partition member (43, 104)
Discharge passages (84, 106) that pass through the first partition member (43, 104) in the vertical direction and discharge the refrigerant compressed in the cylinder chamber (71, 101);
Recesses (85, 107) formed in a portion of the surface of the first partition member (43, 104) opposite to the cylinder (41, 92), including the opening of the discharge channel (84, 106). Have
Among the plurality of first bolts (48), at least one of the first bolts (48a to 48c) disposed in the vicinity of the recess (85, 107) is more than the other first bolts (48d, 48e). A compressor (1) characterized by a small diameter. The plurality of first bolts (48) includes two first bolts (48a, 48c) disposed adjacent to each other in the vicinity of the recesses (85, 107);
The recesses (85, 107) are disposed between the two first bolts (48a, 48c) with respect to the arrangement direction of the plurality of first bolts (48);
The compressor (1) according to claim 1, wherein at least one of the two first bolts (48a, 48c) has a smaller diameter than the other first bolts (48d, 48e). The plurality of first bolts (48) includes three first bolts (48a to 48c) disposed adjacent to each other in the vicinity of the recesses (85, 107),
The recesses (85, 107) extend between each of the three first bolts (48a to 48c) in the arrangement direction of the plurality of first bolts (48);
The compressor (1) according to claim 1, wherein at least one of the three first bolts (48a to 48c) has a smaller diameter than the other first bolts (48d, 48e). A muffler member (45) which is disposed on the surface of the first partition member (43) opposite to the cylinder (41) and forms a muffler space (75) with the first partition member (43). Further comprising
At least the first partition member (43) and the muffler member (45) are fastened by a plurality of second bolts (49) arranged along the circumferential direction of the first partition member (43) when viewed from above and below. Has been
Among the plurality of second bolts (49), at least one of the second bolts (49a to 49c) arranged in the vicinity of the recess (85) has a smaller diameter than the other second bolts (49d). The compressor (1) characterized by these. The plurality of second bolts (49) include two second bolts (49a to 49c) disposed adjacent to each other in the vicinity of the recess (85),
The recess (85) is disposed between the two second bolts (49a, 49c) with respect to the arrangement direction of the plurality of second bolts (49);
The compressor (1) according to claim 4, wherein at least one of the two second bolts (49a, 49c) has a smaller diameter than the other second bolt (49d). The plurality of second bolts (49) includes three second bolts (49a to 49c) disposed adjacent to each other in the vicinity of the recess (85),
The recess (85) extends between each of the three second bolts (49a to 49c) in the arrangement direction of the plurality of second bolts (49);
The compressor (1) according to claim 4, wherein at least one of the three second bolts (49a-49c) has a smaller diameter than the other second bolts (49d). A cylinder (41) disposed in the sealed space (26) and having a cylinder chamber (71) for compressing the refrigerant;
A roller (42) disposed inside the cylinder chamber (71) and moving along an inner peripheral surface of the cylinder chamber (71);
A first partition member (43) defining one of an upper surface and a lower surface of the cylinder chamber (71);
A second partition member (44, 91) defining the other of the upper surface and the lower surface of the cylinder chamber (71);
A muffler member (45) which is disposed on the surface of the first partition member (43) opposite to the cylinder (41) and forms a muffler space (75) with the first partition member (43). And
At least the first partition member (43) and the muffler member (45) are fastened by a plurality of bolts (49) arranged along the circumferential direction of the first partition member (43) when viewed from above and below. And
The first partition member (43)
A discharge passage (84) that passes through the first partition member (43) in the vertical direction and discharges the refrigerant compressed in the cylinder chamber (71);
A recess (85) formed in a portion of the surface of the first partition member (43) opposite to the cylinder (41) including the opening of the discharge channel (84);
Of the plurality of bolts (49), at least one of the bolts (49a to 49c) disposed in the vicinity of the recess (85) has a diameter smaller than that of the other bolts (49d). (1).   The compressor (1) according to any one of claims 1 to 7, wherein the refrigerant is carbon dioxide.

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