Patent Application
20180156216
Embodiments of the invention relates to a rotary compressor which compresses working fluid such as gas refrigerant and to a refrigerating cycle device including a rotary compressor.
Conventionally, a rotary compressor, which houses an electric motor portion and a compression mechanism portion that is driven by a rotary shaft connected with the electric motor portion in a hermetic case, partitions a cylinder chamber in the compression mechanism portion into a suction chamber and a compression chamber with a blade and compresses working fluid such as gas refrigerant, is known, with reference to JP2014-034940. In the rotary compressor, the blade includes two blade members which are provided so as to be superimposed in an axial direction of the rotary shaft, and the two blade members are energized by a coil spring so that the two blade members is made to contact the outer peripheral surface of a roller which rotates eccentrically in a cylinder chamber.
However, in the rotary compressor mentioned in the patent document, there is a case to cause a situation, in which a gap is created at a superimposed part of the two blade members and compressed working fluid in the compression chamber leaks from the gap into the suction chamber to lower compression performance.
Further, when jumping of the blade members is caused by liquid compression etc., there is a possibility to cause a situation in which the two blade members perform jumping discretely and move away from the coil spring to damage a compression mechanism portion.
A rotary compressor according to an embodiment houses an electric motor portion and a compression mechanism portion which is driven via a rotary shaft provided at the electric motor portion, in a hermetic case. The compression mechanism portion comprises a cylinder having both ends covered with covering members and including a cylinder chamber inside, a roller which is fitted to the rotary shaft and rotates eccentrically in the cylinder chamber, and a blade which is provided in the cylinder so that reciprocating movement can be performed, and partitions the cylinder chamber into a suction chamber and a compression chamber by making a tip end portion of the blade contact the outer peripheral surface of the roller. The rotary compressor compressing working fluid. The blade includes two blade members provided so as to be superimposed in an axial direction of the rotary shaft. Tip end portions of the two blade members are made to contact the outer peripheral surface of the roller. The two blade members are energized by a coil spring so that superimposed portions of the blade members are made in contact.
A refrigerating cycle device according to an embodiment comprises a rotary compressor mentioned above, a heat radiator connected to the rotary compressor, an expansion device connected to the heat radiator, and an evaporator connected between the expansion device and the rotary compressor.
Hereinafter, further embodiments will be described. A first embodiment will be described with reference to
A gas refrigerant which is a working fluid is compressed to become high temperature and high pressure in the rotary compressor 2, and heat is radiated from the gas refrigerant of high temperature and high pressure in the heat radiator 3.
The refrigerant is decompressed in the expansion device 4, and a decompressed liquid refrigerant is evaporated to become a gas refrigerant in the evaporator 5.
In the accumulator 6, a liquid refrigerant included in the gas refrigerant is separated, and only the gas refrigerant is supplied to the rotary compressor 2.
According to the refrigerating cycle device 1, a refrigerant is circulated, while phase-changing to a gas refrigerant and a liquid refrigerant, heat dissipation and heat absorption are performed in the process, and room heating, room cooling, heating-up, cooling-down etc. are performed using these heat dissipation and heat absorption.
The rotary compressor 2 has a hermetic case 7 which is formed in a cylindrical shape approximately and is made in an air-sealed state. The hermetic case 7 houses a compression mechanism portion 8 which is a portion for compressing a gas refrigerant, and an electric motor portion 9 which is a portion for driving the compression mechanism portion 8, inside. A rotary shaft 10 is provided at the electric motor portion 9. The compression mechanism portion 8 is driven by the electric motor portion 9 via the rotary shaft 10. A lubricating oil 11 is received in a bottom portion of the hermetic case 7.
The electric motor portion 9 is provided with a rotor 12 fixed to the rotary shaft 10, and a stator 13 which is fixed to an inner periphery of the hermetic case 7 and arranged at a position surrounding the rotor 12. A permanent magnet (not shown in the figure) is provided at the rotor 12, and a coil for use of flowing current (not shown in the figure) is wound at the stator 13. The rotary shaft 10 is supported rotatably around a center line by a main bearing 14 located between the electric motor portion 9 and the compression mechanism portion 8 and by a sub-bearing 15 located at a side opposite to the main bearing 14 with the compression mechanism portion 8 sandwiched.
The compression mechanism portion 8 has a cylinder 16 having both ends in an up-and-down direction which are open, a main bearing 14 which serves as a covering member to cover an opening portion at an upper end side of the cylinder 16, and a sub-bearing 15 which serves as a covering member to cover an opening portion at a lower end side of the cylinder 16. A cylinder chamber 17 is provided in an interior of the cylinder 16 by covering the both ends of the cylinder 16 by means of the main bearing 14 and the sub-bearing 15. The rotary shaft 10 is inserted in the cylinder chamber 17. An eccentric portion 18 is provided at a portion of the rotary shaft 10 located in the cylinder chamber 17. A roller 19 is fitted into the eccentric portion 18. The roller 19 is provided so as to rotate eccentrically in the cylinder chamber 17 with rotation of the rotary shaft 10.
As shown in
As shown in
Returning to
The shapes and the mounted states of the blade members 21, 22 and the coil spring 23 will be explained. As shown in
The diameter of a circumscribed circle of a section of the two projecting portions 31 in the superimposed state in a direction perpendicular to a blade reciprocating movement direction is set as follows. As shown in
At a tip end portion of the coil spring 23, a solid coiling portion 32 which is made solid in a coiling state is provided. The solid coiling portion 32 is contacted with the peripheral portion of the projecting portions 31.
As shown in
In such a configuration, in the rotary compressor 2, the rotary shaft 10 rotates around the center line by flowing current through the electric motor portion 9, the compression mechanism portion 8 is driven by rotation of the rotary shaft 10, and the gas refrigerant is compressed in the compression mechanism portion 8.
The discharge valve 28 is opened when the pressure of the compressed gas refrigerant reaches a predetermined pressure, and the compressed gas refrigerant is discharged from the discharge hole 27 into the discharge muffler 29. The gas refrigerant of high-pressure which is discharged into the discharge muffler 29 passes through the communicating hole 30 and flows into the hermetic case 7, and the interior of the hermetic case 7 is filled with the gas refrigerant of high-pressure. A refrigerating cycle is performed by circulating the gas refrigerant of high-pressure in the hermetic case 7 via the heat radiator 3, the expansion device 4 and the evaporator 5 in the order to the rotary compressor 2 again.
In the compression mechanism portion 8, the tip end portions of the blade members 21, 22 energized by the coil spring 23 are contacted with the outer peripheral surface of the roller 19 which rotates eccentrically, and the interior of the cylinder chamber 17 is partitioned into the suction chamber 24 and the compression chamber 25. By eccentric rotation of the roller 19, the gas refrigerant is sucked into the suction chamber 24 from the suction passage 26 and the sucked gas refrigerant is compressed in the compression chamber 25.
The blade members 21, 22 are provided so as to be superimposed in the axial direction of the rotary shaft 10, and a pressing force which acts against the outer peripheral surface of the roller 19 from each of the blade member 21, 22 is reduced by half compared with a case where a blade of a form which unifies blade members 21, 22 is used. Thus, when part of tip end portions of the blade members 21, 22 contacts the outer peripheral surface of the roller 19, i.e., a state of one-side contact occurs, a planar pressure between the tip end portions of the blade members 21, 22 and the outer peripheral surface of the roller 19 is reduced, and anomalous attrition of the blade members 21, 22 and burn-in are suppressed.
In addition, the projecting portions 31 are provided at one end sides of the rear end portions of the blade members 21, 22. These projecting portions 31 are provided so as to be superimposed in the axial direction of the rotary shaft 10. The projecting portions 31 in a superimposed state are fitted inside the coil spring 23. A diameter of a circumscribed circle of a section of the projecting portions 31 in the superimposed state in a direction perpendicular to a blade reciprocating movement direction is formed larger than an inner diameter dimension of the coil spring 23, at a place at the tip end side in the blade reciprocating movement direction. Thus, a force which is directed to contact the superposed portions of the blade members 21, 22 acts from the coil spring 23 against the blade members 21, 22. Accordingly, occurrence of a gap can be prevented at a superimposed part of the blade members 21, 22, and leakage of gas refrigerant from the gap can be prevented in the cylinder chamber 17. Leakage of gas refrigerant from the compression chamber 25 to the suction chamber 24 can be prevented, and the fall of compression performance of the rotary compressor 2 can be prevented. Further, a force acts against the blade members 21, 22 in a direction which is directed to contact the superposed portions of the blade members 21, 22, and thereby the two blade members can be prevented from performing jumping discretely when jumping of the blade members 21, 22 is caused with liquid compression etc. Accordingly, occurrence of a situation, in which the two blade members 21, 22 move away from the coil spring 23 by discrete jumping of the two blade members 21, 22 and the compression mechanism portion 8 is damaged, can be prevented.
With respect to a work for fitting two projecting portions 31 into the inside of a coil spring 23, at back end sides of the projecting portions 31, as shown in
The diameter of the circumscribed circle of the section of the two projecting portions 31 is formed large gradually as is directed to the tip end side in the blade reciprocating movement direction, and a portion larger than the dimension “L” of the inner diameter of the coil spring 23 is formed at the tip end side. Accordingly, when the projecting portions 31 are fitted into the inside of the coil spring 23, a tip end portion of the coil spring 23 is broadened in an expansively opening direction and contacts outer peripheral portions of the projecting portions 31. By the configuration, it is possible to give a force which is directed to contact superposed portions of the blade members 21, 22, from the coil spring 23 to the blade members 21, 22, surely.
Further, the solid coiling portion 32 is provided at the tip end portion of the coil spring 23, and the solid coiling portion 32 is contacted with the peripheral portions of the projecting portions 31. Thus, it is possible to maintain the force which acts from the coil spring 23 to the blade members 21, 22 and is directed to contact the superposed portions of the blade members 21, 22, constantly, even when the coil spring 23 expands and contracts with reciprocating movement of the blade members 21, 22.
The oil supplying slots 33 are formed at the surface of the blade member 21 opposite to the main bearing 14 and at the surface of the blade member 22 opposite to the sub-bearing 15. These oil supplying slots 33 have the one ends extending to the rear end portions of the blade members 21, 22 and immersed in the lubricating oil 11. Accordingly, the lubricating oil can be fully supplied to a portion where the blade member 21 and the main bearing 14 are opposed and a portion where the blade member 22 and the sub-bearing 15 are opposed, attrition which is caused by contact of the blade members 21, 22 and the main bearing 14 and the sub-bearing 15 can be prevented, the sealing property between the blade members 21, 22 and the main bearing 14 and the sub-bearing 15 can be raised, and the compression performance of the rotary compressor 2 can be raised.
The extending positions of the other ends of the oil supplying slots 33 are positions which do not to reach the tip end portions of the blade members 21, 22 and are set to be positioned in the cylinder chamber 17 when the blade members 21, 22 project to the cylinder chamber 17 most. Thus, occurrence of shortage of the lubricating oil 11 in the hermetic case 7 with flow of a large amount of the lubricating oil 11 in the hermetic case 7 into the hermetic case 7 can be prevented, and contact portions of the roller 19 and the blade members 21, 22 can be lubricated by flowing a small amount of the lubricating oil 11 into the cylinder chamber 17.
The other end sides of the oil supplying slots 33 are formed in a circular arc shape having a slot depth which becomes shallow gradually as is directed to the other ends. By making the oil supplying slots 33 in such a shape, the lubricating oil can be fully supplied to the portion where the blade member 21 and the main bearing 14 are opposed and the portion where the blade member 22 and the sub-bearing 15 are opposed, and the lubricating oil flowing into the cylinder chamber 17 can be suppressed to be a small amount. As shown in
A second embodiment will be described based on
The second embodiment differs from the first embodiment in a configuration using blade members 36 and 37 in place of the blade members 21, 22, and the other configurations are same as those of the first embodiment. In the blade members 21, 22, the projecting portions 31 are provided only at one end sides of the rear end portions of the blade members 21, 22, but, in the blade members 36 and 37, projecting portions 31 of the same shape are provided at both end sides of rear end portions of the blade members 36 and 37.
Further, in the blade members 21, 22, the oil supplying slots 33 are formed only at one surfaces opposite to the main bearing 14 and the sub-bearing 15, but, in the blade members 36 and 37, oil supplying slots 33 are formed at surfaces opposite to the main bearing 14 and the sub-bearing 15 and at surfaces on the opposite sides.
In such a configuration, since the projecting portions 31 of the same shape are provided at the both end sides of the rear end portions of the blade members 36 and 37, when the two blade members 36 and 37 are superimposed, it is possible to superimpose the blade members 36 and 37 without taking the positional relationship of the blade members 36 and 37 in an up-and-down direction into consideration and to raise working efficiency at the time of superimposing the blade members 36 and 37.
Since the oil supplying slots 33 are respectively formed at the surfaces opposite to the main bearing 14 and the sub-bearing 15 and at the surfaces on the opposite sides, it is possible to make the oil supplying slots 33 oppose to the main bearing 14 and the sub-bearing 15 and to supply the lubricating oil 11 using the oil supplying slots 33, when superimposition of the blade members 36 and 37 is performed without taking the positional relationship of the blade members 36 and 37 in an up-and-down direction into consideration.
While certain embodiments of the invention have been described above, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2015-189876 | Sep 2015 | JP | national |
This application is a Continuation of PCT international application No. PCT/JP2016/070946 filed on Jul. 15, 2016; the entire contents of which are incorporated herein by reference. This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2015-189876, filed on Sep. 28, 2015, the entire contents of which are incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/JP2016/070946 | Jul 2016 | US |
| Child | 15873989 | US |
