JP5830671B2 - Rotary compressor and method for manufacturing the same - Google Patents

Description

  The present invention relates to a rotary compressor in which a driving element and a rotary compression element driven by a rotating shaft of the driving element are housed in a sealed container, and a method for manufacturing the rotary compressor.

  Conventionally, this type of rotary compressor is composed of a rotary compression element housed in the lower part of the hermetic container and a drive element (motor) housed in the upper part. The drive element also serves as a stator attached in an annular shape along the inner peripheral surface of the upper space of the sealed container, and a crankshaft that is rotatably inserted by a magnetic field by the stator and that drives the rotary compression element. It is comprised from the rotor fixed to the rotating shaft.

  The rotary compression element includes a cylinder, a roller that is fitted to an eccentric portion formed on the rotation shaft and rotates eccentrically in the cylinder, and a vane that abuts the cylinder and divides the inside of the cylinder into a low pressure chamber side and a high pressure chamber side. It is configured. The opening of the cylinder is closed by an upper support member and a lower support member having bearings for the rotating shaft. In addition, oil for lubricating sliding portions such as the rotary compression element and the rotary shaft is stored in the inner bottom portion of the sealed container.

  When the drive element is energized, the rotor rotates, and the roller fitted to the eccentric portion of the rotation shaft rotates eccentrically in the cylinder. As a result, the low-pressure refrigerant is sucked into the low-pressure chamber side in the cylinder and is compressed by the operation of the roller and the vane (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 9-151885 JP 2010-138852 A

  Here, the sliding loss that occurs in this type of rotary compressor includes those that occur between the roller that constitutes the rotary compression element and the eccentric portion of the rotary shaft with which the roller is fitted. Naturally, oil is supplied between the roller and the eccentric part, and the roller and the eccentric part can rotate relative to each other in order to reduce the contact resistance between the roller and the vane. Since the roller is pressed against the eccentric part by the high pressure, the sliding loss generated between the roller and the eccentric part becomes relatively large.

  In order to reduce the sliding loss between the roller and the eccentric portion, it is necessary to reduce the contact area between the roller and the eccentric portion. In other words, it is necessary to reduce the outer diameter of the eccentric part. However, since the conventional method is an assembly method in which the roller is inserted into the eccentric part after processing the rotating shaft, the outer diameter of the eccentric part (the inner diameter of the roller) It was impossible to make the diameter close to or smaller than the outer diameter of the rotating shaft.

  On the other hand, in the case of a so-called two-cylinder rotary compressor, there has also been proposed a method for improving the assembling workability by dividing the rotating shaft into two parts (for example, see Patent Document 2).

  The present invention has been developed in view of the conventional situation, and provides a rotary compressor that can reduce the sliding loss between the roller and the eccentric portion as much as possible and that does not hinder assembly work, and a method for manufacturing the same. It is to provide.

A rotary compressor according to a first aspect of the present invention comprises a drive element and first and second rotary compression elements driven by a rotation shaft of the drive element in a sealed container. And the first and second cylinders for constituting the second rotary compression element and the first and second eccentric portions provided on the rotary shaft and eccentric in the direction perpendicular to the axis of the rotary shaft. First and second rollers that rotate eccentrically in the first and second cylinders respectively, and a first support having a first bearing of a rotating shaft that closes one opening surface of the first cylinder A member, an intermediate partition plate that closes the other opening surface of the first cylinder and one opening surface of the second cylinder, and a second bearing of the rotating shaft that closes the other opening surface of the second cylinder And a rotating shaft is supported by the first bearing. A first rotating shaft portion having the first eccentric portion; a second rotating shaft portion connected to the first rotating shaft portion and supported by a second bearing and having the second eccentric portion; The portions of the first and second eccentric portions that protrude from the first and second rotating shaft portions on the opposite side to the protruding portions are first portions of the portions supported by the first and second bearings. Each of the first and second rotating shaft portions is located inside.

According to a second aspect of the present invention, in the rotary compressor of the present invention , the first rotary shaft portion and the second rotary shaft portion are connected to each other by a screw groove formed on them and screwed together, and the screw groove is rotated. It is characterized by being cut in a direction in which tightening is increased by rotation of the shaft.

Rotary compressor of the invention of claim 3, the first rotation shaft and the second rotation shaft in a first aspect of the present invention, being connected by meshing of them formed recesses and protrusions And

According to a fourth aspect of the present invention, there is provided a rotary compressor including an oil pump inserted and fitted to the rotary shaft in each of the above-described inventions, and the oil pump is inserted up to a connecting portion of the first and second rotary shaft portions. It is characterized by.

In the manufacturing method of the invention of claim 5 , in manufacturing the rotary compressor of each of the above inventions, after processing the connecting portion of the first and second rotating shaft portions, the first and second rotating shaft portions are It connects, and it processes the other location of a rotating shaft in the state, It is characterized by the above-mentioned.

  According to the present invention, the second rotating shaft is supported by the first bearing, and the second rotating shaft is connected to the first rotating shaft and is supported by the second bearing and has the eccentric portion. Since the outer diameter of the eccentric portion is reduced and the eccentric portion protruding from the second rotating shaft portion is opposite to the protruding portion, the portion opposite to the protruding portion is supported by the second bearing. Even if it is located inside the second rotating shaft part of the part, the connecting part of the second rotating shaft part with the first rotating shaft part is inserted into the roller and the roller is fitted to the eccentric part It becomes possible to make it.

In particular, in the present invention, the first and second rotary compression elements are provided , and a first roller that rotates eccentrically in the first cylinder of the first rotary compression element is fitted to the first rotary shaft portion. the first eccentric portion provided than is provided a second eccentric portion which the second roller rotates eccentrically in the second cylinder of the second rotary compression element is fitted to the second rotating shaft portion The connecting portions of the first and second rotating shaft portions can be inserted into the respective rollers, and the first and second rollers can be fitted to the first and second eccentric portions.

  As a result, the outer diameter of the eccentric portion can be reduced to significantly reduce the sliding loss between the roller and the eccentric portion, and significant energy saving can be realized by reducing the input of the rotary compressor. In particular, since the maximum excluded volume of the rotary compression element can be expanded without changing the cylinder side, it is possible to easily cope with high output.

According to a second aspect of the present invention, the first rotary shaft portion and the second rotary shaft portion are connected to each other by a screw groove formed on and screwed to each other, and the screw groove is connected to the rotary shaft. If it is cut in a direction in which tightening is increased by rotation, both rotating shaft portions can be easily connected, and assembling workability is improved, and the first rotating shaft portion and the second rotating shaft portion are loosened. Disappears.

In this case, the assembly workability is good even if the first rotating shaft portion and the second rotating shaft portion are formed with recesses and projections and are connected by being engaged as in the third aspect of the invention. Become.

Further, when the oil pump inserted and fitted to the rotary shaft is inserted to the connection portion of the first and second rotary shaft portions as in the invention of claim 4 , the connection between both rotary shaft portions is held by this oil pump. Will be able to.

Further, in manufacturing the rotary compressor as in the invention of claim 5 , after processing the connecting portions of the first and second rotating shaft portions, the first and second rotating shaft portions are connected, If machining is performed on other parts of the rotating shaft in the state, the machining accuracy of the rotating shaft can be maintained equivalent to that of a normal one.

It is a vertical side view of the rotary compressor to which the present invention is applied. (Example 1) which is a principal part expansion vertical side view of the rotating shaft of the rotary compressor of FIG. It is a bottom view of the rotating shaft of FIG. FIG. 6 is an enlarged vertical side view of a main part of another embodiment of the rotary shaft of the rotary compressor in FIG. 1 (Embodiment 2). It is a disassembled perspective view of the rotating shaft of FIG.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a longitudinal side view of a rotary compressor 1 according to an embodiment to which the present invention is applied, FIG. 2 is an enlarged longitudinal side view of a main part of a rotating shaft 8, and FIG. 3 is a bottom view of the rotating shaft 8. The rotary compressor 1 according to the embodiment is an internal high-pressure two-cylinder hermetic rotary compressor including first and second rotary compression elements.

  The rotary compressor 1 houses a rotary compression mechanism portion 3 including first and second rotary compression elements 10 and 20 in a lower portion of an internal space of a vertical cylindrical sealed container 2 made of a steel plate, and an electric motor above the rotary compression mechanism portion 3. The drive element 4 which consists of is accommodated.

  The sealed container 2 includes a container body 2A that houses the drive element 4 and the first and second rotary compression elements 10 and 20 (the rotary compression mechanism 3), and a substantially bowl-shaped end that closes the upper opening of the container body 2A. A cap (lid) 2B and a bottom portion 2C that closes the lower opening of the container body 2A are configured. On the upper surface of the end cap 2B, a terminal (wiring is omitted) 35 for supplying electric power to the driving element 4 located above the sealed container 2 is attached. Further, a refrigerant discharge pipe 9 is attached to the center portion of the end cap 2B and communicates with the inside of the sealed container 2.

  The space in the bottom of the sealed container 2 is an oil reservoir, in which oil for lubricating sliding portions such as the first and second rotary compression elements 10 and 20 and the rotary shaft 8 is stored. Yes. A mounting base 70 is provided on the outer bottom portion of the bottom portion 2C.

  The rotary compression mechanism unit 3 includes a first rotary compression element 10, a second rotary compression element 20, and an intermediate partition plate 30 sandwiched between the rotary compression elements 10 and 20. In the rotary compression mechanism unit 3 of this embodiment, the first rotary compression element 10 is provided on the upper side with the intermediate partition plate 30 in between, and the second rotary compression element 20 is provided on the lower side. The first rotary compression element 10 and the second rotary compression element 20 are arranged in the first and second cylinders 12 and 22 disposed above and below the intermediate partition plate 30 and 180 degrees in each cylinder 12 and 22. First and second shafts that are fitted in first and second eccentric portions 13 and 23 that are offset in a direction orthogonal to the axis of the rotary shaft 8 with a phase difference and rotate eccentrically in the cylinders 12 and 22, respectively. Second rollers 14, 24, vanes (not shown) that are in contact with the rollers 14, 24 and divide the cylinders 12, 22 into a low pressure chamber side and a high pressure chamber side, an opening surface on the upper side of the cylinder 12, and a cylinder Upper support members as first and second support members, each having an upper bearing 15A (first bearing) and a lower bearing 25A (second bearing) of the rotary shaft 8 by closing the lower opening surface of the rotary shaft 22. 15 and lower support member 25 Constructed.

  The cylinders 12 and 22 are formed with suction passages 16 and 26 respectively communicating with the compression chambers inside the cylinders 12 and 22. Discharge mufflers 27 and 17 are provided on the lower support member 25 on the side opposite to the drive element 4 (lower side) and the upper support member 15 on the drive element 4 side (upper side), respectively.

  The discharge muffler 27 located on the lower side of the lower support member 25 and the inside of the cylinder 22 are communicated by a discharge passage 29, and the discharge muffler is opened and closed by opening and closing a discharge valve 29V provided in the opening of the discharge passage 29 on the discharge muffler 27 side. 27 and the cylinder 22 (the high pressure chamber side in the cylinder 22) are configured to communicate with each other.

  Further, the discharge muffler 17 located above the upper support member 15 and the inside of the cylinder 12 are communicated with each other by a discharge passage 19. By opening and closing a discharge valve 19 </ b> V provided at the opening of the discharge passage 19 on the discharge muffler 17 side. The inside of the discharge muffler 17 and the inside of the cylinder 12 (the high pressure chamber side in the cylinder 12) are configured to be able to communicate with each other. The discharge muffler 27 and the discharge muffler 17 are communicated by a communication path (not shown) that penetrates the lower support member 25, the cylinder 22, the intermediate partition plate 30, the cylinder 12 and the upper support member 15 in the axial direction (vertical direction). Yes.

  On the other hand, the drive element 4 described above is inserted so as to be rotatable by a magnetic field generated by the stator 5 and a stator (stator) 5 which is annularly welded and fixed along the inner peripheral surface of the upper space of the sealed container 2. It is comprised from the rotor (rotor) 7. FIG. The rotary shaft 8 inserted and fixed in a press-fitted state in a hole formed through the center of the rotor 7 also serves as a crankshaft for driving the first and second rotary compression elements 10 and 20 described above. The upper end of the rotating shaft 8 is located at the upper end of the rotor 7 so as to extend in the vertical direction (vertical direction) through the center of the hermetic container. The lower end of the rotary shaft 8 is located in the oil reservoir below the rotary compression mechanism 3 and is immersed in the oil stored in the oil reservoir. An oil passage 8 </ b> A is formed at the center of the rotating shaft 8 in the axial direction. The passage diameter of the oil passage 8A is a hole with a step that is enlarged from the lower end of the rotating shaft 8 to the vicinity of the center of the first eccentric portion 13 (FIGS. 1, 2, and 4). An oil pump 50 is inserted into and fitted in the oil passage 8A of the portion from the lower part (lower end) of the rotating shaft 8. The oil pump 50 sucks up the oil in the oil reservoir at the inner bottom portion of the sealed container 2 by the rotation of the rotating shaft 8 and supplies it to the sliding portion of the rotary compression mechanism portion 3 through the oil passage 8A.

  On the other hand, sleeves 60 and 61 are welded and fixed to the side surfaces of the container body 2A of the sealed container 2 at positions corresponding to the suction passages 16 and 26 of the cylinders 12 and 22, respectively. A refrigerant introduction pipe 40 for introducing refrigerant gas into the cylinder 12 is inserted and connected into the sleeve 60, and one end of the refrigerant introduction pipe 40 communicates with the suction passage 16 of the cylinder 12. The other end of the refrigerant introduction pipe 40 opens at the upper part in the accumulator 65. A refrigerant introduction pipe 41 for introducing refrigerant gas into the cylinder 22 is inserted and connected in the sleeve 61, and one end of the refrigerant introduction pipe 41 communicates with the suction passage 26 of the cylinder 22. The other end of the refrigerant introduction pipe 41 is opened at the upper part in the accumulator 65 as in the refrigerant introduction pipe 40.

  The accumulator 65 is a tank that performs gas-liquid separation of the suction refrigerant, and is attached to the upper side surface of the container body 2 </ b> A of the sealed container 2 via a bracket 67. Then, the refrigerant introduction pipe 40 and the refrigerant introduction pipe 41 are inserted into the accumulator 65 from the bottom, and the other end opening is positioned above the accumulator 65. One end of the refrigerant pipe 68 is inserted into the upper end portion in the accumulator 65.

  With the above configuration, when the stator 5 of the drive element 4 is energized via the terminal 35 and a wiring (not shown), the drive element 4 is activated and the rotor 7 rotates. By this rotation, the rollers 14 and 24 fitted to the eccentric portions 13 and 23 provided integrally with the rotary shaft 8 rotate eccentrically in the cylinders 12 and 22.

  Thereby, the low-pressure refrigerant flows into the accumulator 65 from the refrigerant pipe 68 of the rotary compressor 1. After the low-pressure refrigerant flowing into the accumulator 65 is gas-liquid separated there, only the refrigerant gas enters the refrigerant introduction pipes 40 and 41 opened in the accumulator 65. The low-pressure refrigerant gas that has entered the refrigerant introduction pipe 41 passes through the suction passage 26 and is sucked into the low-pressure chamber side of the cylinder 22 of the second rotary compression element 20.

  The refrigerant gas sucked into the low-pressure chamber side of the cylinder 22 is compressed by the operation of the roller 24 and a vane (not shown) to become high-temperature and high-pressure refrigerant gas, and is discharged from the high-pressure chamber side of the cylinder 22 to the discharge muffler 27 through the discharge passage 29. Is done. The refrigerant gas discharged to the discharge muffler 27 is discharged to the discharge muffler 17 through a communication path (not shown), and merges with the refrigerant gas compressed by the first rotary compression element 10.

  On the other hand, the low-pressure refrigerant gas that has entered the refrigerant introduction pipe 40 is sucked into the low-pressure chamber side of the cylinder 12 of the first rotary compression element 10 through the suction passage 16. The refrigerant gas sucked into the low pressure chamber side of the cylinder 12 is compressed by the operation of the roller 14 and a vane (not shown) to become a high temperature and high pressure refrigerant gas, and is discharged from the high pressure chamber side of the cylinder 12 to the discharge muffler 17 through the discharge passage 19. Then, it merges with the refrigerant gas from the second rotary compression element 20 described above. Then, the merged refrigerant gas is discharged into the sealed container 12 through a discharge hole 28 formed in the discharge muffler 17, and is discharged out of the sealed container 2 from the refrigerant discharge pipe 9.

  Next, the structure of the rotating shaft 8 of the present invention will be described with reference to FIGS. In this embodiment, the rotating shaft 8 is composed of two parts, a first rotating shaft portion 36 located on the upper side and a second rotating shaft portion 37 connected to the lower end of the first rotating shaft portion 36. Yes. And the upper part of the 1st rotating shaft part 36 located above is fixed to the rotor 7, and the said 1st eccentric part 13 is formed in the lower part. The upper side of the first eccentric portion 13 is supported by the upper bearing 15 </ b> A of the upper support member 15. Further, the connection portion 36A at the lower end of the first rotating shaft portion 36 is formed with a recess, and a female-side screw groove 38 is cut on the inner peripheral surface of the recess.

  Here, the outer diameter of the eccentric portion 13 is smaller than the conventional one, and the portion 13B opposite to the protruding portion 13A (FIGS. 2 and 3) protruding from the first rotating shaft portion 36 is: It is located inside the portion 36B supported by the upper bearing 15A of the first rotating shaft portion 36 (FIG. 2). In addition, the outer diameter of the connecting portion 36A at the lower end of the first rotating shaft portion 36 below the first eccentric portion 13 is set to a size (diameter) twice the radius from the center to the portion 13B in the embodiment. (Fig. 2). That is, the outer diameter of the connecting portion 36A is sufficiently smaller than the outer diameter of the first eccentric portion 13 and the portion 36B.

  On the other hand, the second eccentric portion 23 is formed on the upper portion of the second rotating shaft portion 37 located on the lower side. The lower side of the second eccentric portion 23 is supported by the lower bearing 25 </ b> A of the lower support member 25. A projecting portion having a reduced diameter is formed in the connection portion 37A at the upper end of the second rotating shaft portion 37, and a male screw groove 39 is cut around the projecting portion. In contrast to this, a protruding portion and a male screw groove are formed in the connecting portion 36A of the first rotating shaft portion 36, and a recessed portion and a female screw are formed in the connecting portion 37A of the second rotating shaft portion 37. A groove may be formed. The screw grooves 38 and 39 are cut in a direction in which mutual tightening is increased by the rotation of the rotating shaft 8 that is rotated by driving of the driving element 4.

  Here, the outer diameter of the eccentric portion 23 is also smaller than that of the conventional one, and the portion 23B opposite to the protruding portion 23A (FIGS. 2 and 3) protruding from the second rotating shaft portion 37 is It is located inside a portion 37B supported by the lower bearing 25A of the second rotating shaft portion 37 (FIG. 2). Further, the outer diameter of the connecting portion 37A at the upper end of the second rotating shaft portion 37 above the second eccentric portion 23 is set to a size (diameter) twice the radius from the center to the portion 23B in the embodiment. (FIG. 2). That is, the outer diameter of the connecting portion 37A is sufficiently smaller than the outer diameter of the second eccentric portion 23 and the portion 37B.

  The processing and assembly procedures of the rotating shaft 8, the rollers 14, 24, and the intermediate partition plate 30 with the above configuration will be described. First, the processing of the connecting portions 36A and 37A of the rotary shaft portions 36 and 37 is executed with a required accuracy. Each screw groove 38, 39 is also formed. Next, while rotating the connecting portion 37A to 36A, the screw groove 39 of the projecting portion of the connecting portion 37A is screwed into the screw groove 38 of the recessed portion of the connecting portion 36A to connect both the rotating shaft portions 36 and 37. In the state where the series of rotating shafts 8 is configured in this way, the machining of the eccentric parts 13 and 23 and the parts 36B and 37B other than the connecting parts 36A and 37A is executed with a required accuracy (all machining).

  After all the processing is completed, the rotary shaft portions 36 and 37 are separated again. Then, the first rotating shaft portion 36 is inserted into the roller 14 by inserting the connection portion 36 </ b> A into the first roller 14, and the roller 14 is fitted around the first eccentric portion 13. At this time, since the connecting portion 36A is sufficiently smaller than the outer diameter of the eccentric portion 13, that is, the inner diameter of the roller 14, the roller 14 can be fitted to the eccentric portion 13 without any trouble. Thereafter, the cylinder 12 and the upper support member 15 are assembled.

  Further, the second rotating shaft portion 37 is inserted into the roller 24 by inserting the connection portion 37 </ b> A into the second roller 24, and the roller 24 is fitted around the second eccentric portion 23. At this time, since the connecting portion 37A is also sufficiently smaller than the outer diameter of the eccentric portion 23, that is, the inner diameter of the roller 24, the roller 24 can be fitted to the eccentric portion 23 without any trouble. Thereafter, the cylinder 22 and the lower support member 25 are assembled.

  In this state, one of the connecting portions 36A and 37A is inserted into the center hole of the intermediate partition plate 30, and the screw grooves 38 and 39 are used while the intermediate partition plate 30 is sandwiched between the rotating shaft portions 36 and 37. Then, the rotary shaft portions 36 and 37 are connected again to complete the rotary compression mechanism portion 3. Thereafter, the oil pump 50 is inserted and fitted from the lower end of the oil passage 8 </ b> A of the second rotating shaft portion 37. The upper portion of the oil pump 50 reaches the eccentric portion 13 of the first rotating shaft portion 36 through the connection portions 36A and 37A.

Thus, the rotary shaft 8 is connected to the first rotary shaft portion 36 supported by the upper bearing 15A and having the first eccentric portion 13, and supported by the lower bearing 25A. Since the second rotating shaft portion 37 having the second eccentric portion 23 is formed, the outer diameter of the eccentric portions 13 and 23 protruding from the rotating shaft portions 36 and 37 is reduced by reducing the outer diameter of the eccentric portions 13 and 23. Even if the portions 13B and 23B opposite to the protruding portions 13A and 23A are positioned more inside the portions 36B and 37B supported by the bearings 15A and 25A, the first and second rotating shaft portions 36 are used. , 37 can be inserted into the rollers 14 and 24 so that the rollers 14 and 24 can be fitted to the eccentric portions 13 and 23, respectively.
As a result, the outer diameters of the eccentric parts 13 and 23 can be reduced to significantly reduce the sliding loss between the rollers 14 and 24 and the eccentric parts 13 and 23, and a significant energy saving can be achieved by reducing the input of the rotary compressor 1. Can be realized. In particular, since the maximum excluded volume of the rotary compression elements 10 and 20 can be increased without changing the inner diameters of the cylinders 12 and 22, it is possible to easily cope with higher output.

  Further, the first rotary shaft portion 36 and the second rotary shaft portion 37 are connected to each other by screw grooves 38 and 39 that are formed on and screwed to each other, and the screw grooves 38 and 39 are connected to the rotary shaft. Since it is cut in the direction in which tightening is increased by the rotation of 8, both rotating shaft portions 36 and 37 can be easily connected, and the assembling workability is improved.

  Further, since the oil pump 50 inserted and fitted to the rotary shaft 8 is inserted up to the connecting portion of the first and second rotary shaft portions 36 and 37, both the rotary shaft portions 36 and 37 are inserted by the oil pump 50. Can be maintained, and oil can be prevented from flowing out from a slight gap in the joint.

  Furthermore, after processing the connecting portions 36A and 37A of the first and second rotating shaft portions 36 and 37, the first and second rotating shaft portions 36 and 37 are connected, and in this state, the rotating shaft 8 Since other portions are processed, the processing accuracy of the rotating shaft 8 can be maintained equivalent to that of a normal one.

  Next, FIGS. 4 and 5 show other embodiments of the present invention. In each figure, the same reference numerals as those in FIGS. 1 to 3 show the same or similar functions. In this case, the threaded grooves are not cut in the connecting portions 36A and 37A of the rotary shaft portions 36 and 37, and instead, a plurality of concave portions 36C and 37C and convex portions 36D and 37D are formed. Further, the concave portion 36 </ b> C of the first rotary shaft portion 36 corresponds to the convex portion 37 </ b> D of the second rotary shaft portion 37, and the convex portion 36 </ b> D of the first rotary shaft portion 36 is the concave portion 37 </ b> C of the second rotary shaft portion 37. It corresponds to.

  When connecting both the rotary shaft portions 36 and 37, the convex portion 37D of the second rotary shaft portion 37 is engaged with the concave portion 36C of the first rotary shaft portion 36, and the first rotary shaft portion 36 The convex portion 36 </ b> D is engaged with the concave portion 37 </ b> C of the second rotating shaft portion 37. Thereafter, as described above, the oil pump 50 is inserted and fitted to the connecting portions 36 and 37, so that the connection between the rotating shaft portions 36 and 37 is maintained.

  As described above, even if the concave portions 36C and 37C and the convex portions 36D and 37D are formed in the first rotating shaft portion 36 and the second rotating shaft portion 37 and they are meshed and connected, the assembly workability is improved. It becomes good. In particular, in this case, the fitting of the oil pump 50 plays a major role in maintaining the connection between the rotating shaft portions 36 and 37, and no special fastener is required. Further, it is possible to prevent the oil pumped up by the oil pump 50 from flowing out from a slight gap between the joint portions of the concave portions 36C and 37C and the convex portions 36D and 37D to the intermediate partition plate 30 side.

  In each of the above-described embodiments, the present invention has been described with a two-cylinder rotary compressor including the first and second rotary compression elements 10 and 20. However, the present invention is not limited to this, and the present invention also applies to a multi-cylinder rotary compressor. Conversely, a single-cylinder rotary compressor having a single rotary compression element may be used. In that case, for example, the eccentric portion 13 is not formed on the first rotating shaft portion 36 of FIGS. 2 and 4, and the eccentric portion 23 is formed only on the second rotating shaft portion 37.

  In the case of FIG. 2, for example, a concave portion is formed at the lower end of the portion 36B of the first rotating shaft portion 36 to form a screw groove 38, and the connecting portion 37A of the second rotating shaft portion 37 is entirely formed. May be screwed around the screw groove 39 as a protruding portion (that is, the protruding portion protrudes directly from the upper surface of the eccentric portion 24). Also in this case, the roller 24 can be fitted to the eccentric portion 23 from the connecting portion 37A side without any trouble.

DESCRIPTION OF SYMBOLS 1 Rotary compressor 2 Sealed container 3 Rotary compression mechanism part 4 Drive element 5 Stator 7 Rotor 8 Rotating shaft 9 Refrigerant discharge pipe 10, 20 Rotary compression element 12, 22 Cylinder 13, 23 Eccentric part 14, 24 Roller 15, 25 Support Member 30 Intermediate partition plate 36, 37 Rotating shaft portion 36A, 37A Connection portion 36C, 37C Concavity 36D, 37D Convex portion 50 Oil pump

Claims (5)

In a rotary compressor comprising a hermetic container housing a drive element and first and second rotary compression elements driven by a rotation shaft of the drive element,
First and second cylinders for constituting the first and second rotary compression elements;
First and second shafts are fitted to first and second eccentric portions that are provided on the rotary shaft and are eccentric in a direction perpendicular to the axis of the rotary shaft, and are eccentrically rotated in the first and second cylinders, respectively. Two rollers,
A first support member that closes one opening surface of the first cylinder and has a first bearing of the rotating shaft;
An intermediate partition plate for closing the other opening surface of the first cylinder and the one opening surface of the second cylinder;
A second support member that closes the other opening surface of the second cylinder and has a second bearing of the rotating shaft,
The rotating shaft is supported by the first bearing and has a first rotating shaft portion having the first eccentric portion, and is connected to the first rotating shaft portion and supported by the second bearing. A second rotating shaft portion having the second eccentric portion,
The portion of the first and second eccentric portions protruding from the first and second rotating shaft portions on the opposite side to the protruding portions is the portion of the portion supported by the first and second bearings. A rotary compressor characterized in that the rotary compressor is located inside each of the first and second rotating shaft portions. The first rotary shaft portion and the second rotary shaft portion are connected to each other by a screw groove formed on and screwed to each other, and the screw groove is cut in a direction in which tightening is increased by rotation of the rotary shaft. The rotary compressor according to claim 1, wherein the rotary compressor is provided. 2. The rotary compressor according to claim 1, wherein the first rotary shaft portion and the second rotary shaft portion are connected by meshing a concave portion and a convex portion formed in the first rotary shaft portion and the second rotary shaft portion. The oil pump inserted and fitted to the said rotating shaft is provided, This oil pump is inserted to the connection location of the said 1st and 2nd rotating shaft part, The Claim 1 thru | or 3 characterized by the above-mentioned. The rotary compressor in any one of them. After processing the connection portion of the first and second rotating shaft portions, connecting the first and second rotating shaft portions and processing other portions of the rotating shaft in that state. The method for manufacturing a rotary compressor according to any one of claims 1 to 4, characterized in that:

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