JP2004245178A - Rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary compressor capable of preventing, at low cost, degradation of performance such as generation of distortion at a mounting portion due to heat caused by welding, in welding a rotating compressive element to a sealed container. <P>SOLUTION: The second rotating compressive element 34 of this rotary compressor 10 comprises a cylinder 38; an upper supporting member which blocks an opening surface of the cylinder 38 and has bearings for a rotating shaft 16; a discharging noise reduction chamber 62 recessed in the upper supporting member 54; and an upper cover 66 for blocking an opening for the discharging noise reduction chamber 62. The cylinder 38, a cylinder 40 of the first rotating compressive element 32, the upper supporting 54, a lower supporting member 56, and a lower cover are fixed on the upper cover 66 and the upper cover 66 is welded to the sealed container 12. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotary compressor including an electric element and a rotary compression element driven by a rotation shaft of the electric element in a closed container.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a rotary compressor of this type, for example, a vertical rotary compressor, includes an electric element provided in a closed container and a rotary compression element driven by the electric element. The electric element is composed of an annular stator attached along the inner peripheral surface of the upper space of the closed container, and a rotor inserted and installed at a slight interval inside the stator, and this rotor is centered. The shaft is shrink-fitted and fixed to a rotating shaft extending in the vertical direction. In addition, the rotary compression element is a cylinder, a roller fitted to an eccentric portion formed on the rotary shaft and eccentrically rotating within the cylinder, and a support member that closes an opening surface of the cylinder and also serves as a bearing for the rotary shaft. (For example, see Patent Document 1).
[0003]
Refrigerant gas is sucked into the low-pressure chamber side of the cylinder from the suction port of the rotary compression element, compressed by the operation of the rollers and vanes, and discharged from the high-pressure chamber side of the cylinder through the discharge port, the discharge muffler, and the external radiator. It is configured to flow in.
[0004]
Here, when mounting the rotary compression element in the closed container, the outer diameter of the cylinder or the support member is brought into contact with the inner surface of the closed container, and in this state, the outer diameter is burned on the inner surface of the closed container. After the fitting, tack welding is performed, or the sealed container and the rotary compression element are fixed by providing a dedicated welding holder, and then the outer diameter portion is shrink-fitted to the inner surface of the sealed container and then tack-welded. Was.
[0005]
[Patent Document 1]
JP-A-62-195484 [0006]
[Problems to be solved by the invention]
When the rotary compression element is attached to the closed container by such a method, there is a possibility that the welded portion may be distorted by heat during welding. As a result, the sealing performance between the cylinder and the support member closing the upper and lower opening surfaces of the cylinder is reduced, and the refrigerant gas in the cylinder leaks, or the roller eccentrically rotating in the cylinder rotates. There has been a problem of generating noise. Further, when a holder dedicated to mounting is used, there is a problem that the cost of the holder and the like is increased.
[0007]
The present invention has been made to solve such a conventional technical problem, and when welding and fixing a rotary compression element to a closed container, performance such as distortion of an attachment portion due to heat at the time of welding is generated. It is an object of the present invention to provide a rotary compressor that can prevent the deterioration at low cost.
[0008]
[Means for Solving the Problems]
That is, the rotary compression element of the rotary compressor according to the present invention includes a cylinder, a closing member that closes an opening surface of the cylinder, and a support member having a bearing of a rotating shaft, and a discharge muffling chamber formed in the support member. A cover for closing the opening of the discharge muffling chamber is provided, and the cylinder and the support member are fixed to the cover, and the cover is fixed to the closed container.For example, when the cover is fixed to the closed container by welding, Thus, the sealed container and the cylinder or the support member can be attached without directly welding.
[0009]
According to the second aspect of the present invention, in addition to the above aspect, the rotary compression element includes a first rotary compression element and a second rotary compression element, and stores the refrigerant compressed by the first rotary compression element in the closed container. The intermediate pressure refrigerant is discharged into the second rotary compression element and compressed, and the cover closes the opening of the discharge muffling chamber of the second rotary compression element. In this case, the cover can be fixed to a closed container by using a cover formed to be thicker than usual.
[0010]
According to the third aspect of the present invention, in addition to the above inventions, since the peripheral portion of the cover is extended in the axial direction of the rotating shaft, when the cover is fixed to the closed container by welding, the disadvantage that the cover is distorted due to the heat of welding. It can be avoided effectively.
[0011]
According to the fourth aspect of the present invention, in addition to the above-mentioned inventions, the sealed container and the cover are made of an aluminum-based material, so that the total weight of the compressor can be significantly reduced.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of an internal intermediate pressure type multi-stage (two-stage) compression type rotary compressor 10 having first and second rotary compression elements 32 and 34 as an embodiment of a multi-stage compression type compressor of the present invention. 2 is a plan sectional view of the rotary compressor 10.
[0013]
In each figure, reference numeral 10 denotes an internal intermediate pressure type multi-stage (two-stage) compression type rotary compressor mounted in an engine room of a vehicle such as an electric vehicle (HEV or PEV). The compressor 10 has a cylindrical hermetic container 12, an electric element 14 disposed above and housed in an inner space of the hermetic container 12, and is disposed below the electric element 14, and is driven by a rotating shaft 16 of the electric element 14. The rotary compression mechanism 18 includes a first rotary compression element 32 (first stage) and a second rotary compression element 34 (second stage) as the rotary compression elements to be used.
[0014]
The closed container 12 of the embodiment is formed of an aluminum material, and has a container main body 12A for housing the electric element 14 and the rotary compression mechanism 18, and a substantially bowl-shaped end cap (lid) for closing an upper opening of the container main body 12A. 12B. A circular mounting hole 12D is formed at the center of the upper surface of the end cap 12B, and a terminal (wiring omitted) 20 for supplying electric power to the electric element 14 is mounted in the mounting hole 12D. Reference numeral 21 denotes an external wiring connected to the terminal 20. In addition, the upper end of the container body 12A is expanded outward and is formed thicker than the other parts. The lower end of the end cap 12B is inserted into the inner wall of the expanded portion 13A, and the inner wall of the expanded portion 13A is inserted. The sealed container 12 is formed by fixing the end cap 12B by arc welding from the outside in the inserted state.
[0015]
The terminal 20 is entirely covered with a metal (aluminum or the like) terminal cover 100 as a cover for protecting the terminal 20. A plurality of bolt holes are formed around the terminal cover 100. Further, a bolt groove is formed in the end cap 12B corresponding to the bolt hole of the terminal cover 100, and the terminal cover 100 is arranged so that the bolt hole of the terminal cover 100 and the bolt groove of the end cap 12B coincide with each other. The terminal cover 100 is attached to the center of the upper end of the end cap 12B by screwing and fixing the bolt 102 into the bolt groove from above.
[0016]
The electric element 14 is a so-called magnetic pole concentrated winding type DC motor, and is inserted into the stator 22 annularly attached along the inner peripheral surface of the upper space of the closed casing 12 with a slight interval provided inside the stator 22. And an installed rotor 24. The rotor 24 is fixed to the rotating shaft 16 that extends vertically through the center. The stator 22 is formed by laminating donut-shaped electromagnetic steel sheets, and is wound around the inner surface of the closed container 12 by shrink-fitting, and is wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method. Stator coil 28. The rotor 24 is formed of a laminated body 30 of electromagnetic steel sheets similarly to the stator 22, and is formed by inserting a permanent magnet MG into the laminated body 30.
[0017]
An oil pump 99 is formed at the lower end of the rotary shaft 16 as oil supply means. The oil pump 99 sucks up lubricating oil from an oil reservoir formed at the bottom of the sealed container 12, and passes through an oil hole (not shown) formed in the center of the rotating shaft 16 in a vertical direction. Sliding of the upper and lower eccentric portions 42 and 44 and the first and second rotary compression elements 32 and 34 from lateral oil supply holes 82 and 84 (also formed on the upper and lower eccentric portions 42 and 44) communicating with the oil holes. Oil is supplied to the parts and the like. As a result, the first and second rotary compression elements 32 and 34 are prevented from being worn and sealed.
[0018]
An intermediate partition plate 36 is held between the first rotary compression element 32 and the second rotary compression element 34. That is, the first rotary compression element 32 and the second rotary compression element 34 include an intermediate partition plate 36, an upper cylinder 38, a lower cylinder 40 disposed above and below the intermediate partition plate 36, The upper and lower rollers 46 and 48 eccentrically rotated by the upper and lower eccentric portions 42 and 44 provided on the rotating shaft 16 with a phase difference of 180 degrees in the inside 40, and contact the upper and lower rollers 46 and 48 to move up and down. A vane (not shown) that partitions the insides of the cylinders 38 and 40 into a low-pressure chamber side and a high-pressure chamber side, and an upper opening surface of the upper cylinder 38 and a lower opening surface of the lower cylinder 40 are closed to form a bearing for the rotary shaft 16. An upper supporting member 54 and a lower supporting member 56 are also used as supporting members.
[0019]
In the upper support member 54 and the lower support member 56, a suction passage 60 (the upper suction passage is shown in the drawing) communicating with the insides of the upper and lower cylinders 38 and 40 at a suction port 161 (the lower suction port is not shown). ), And discharge muffling chambers 62 and 64 formed by partially recessing and closing the recess with the upper cover 66 and the lower cover 68.
[0020]
Here, the upper cover 66 is made of an aluminum material, and has a substantially donut shape in which a hole is formed at a central portion for the rotation shaft 16 and the bearing 54A of the upper support member 54 to penetrate. In addition, since the upper cover 66 has an intermediate pressure in the closed container 12, the high-temperature and high-pressure refrigerant discharged into the discharge muffling chamber 62 leaks into the closed container 12 and increases the pressure of the refrigerant in the closed container 12. In order to prevent the inconvenience, the thickness of the upper cover 66 is increased to increase the strength. In the multi-stage compression type compressor having the internal intermediate pressure as in the present embodiment, the pressure difference between the pressure in the closed vessel 12 and the pressure in the discharge muffling chamber 62 increases. In particular, when a refrigerant having a large difference between high and low pressures, such as carbon dioxide, is used, the pressure difference between the inside of the sealed container 12 and the discharge muffling chamber 62 becomes larger, so that the upper cover 66 needs some rigidity (thickness). It becomes. Further, since the upper cover 66 is made of an aluminum material, the high heat of the refrigerant discharged into the discharge muffling chamber 62 can be transmitted to the closed casing 12 at an early stage, which is useful for improving the reliability of the electric element 14. Thus, the reliability of the compressor 10 is improved. An outer peripheral surface 66 </ b> A corresponding to a peripheral portion of the upper cover 66 is formed so as to contact the inner wall of the closed container 12. The outer peripheral surface 66A of the upper cover 66 is extended in the vertical direction (the axial direction of the rotating shaft 16; in this embodiment, upward) as shown in the figure. The expanded outer peripheral surface 66 </ b> A and the closed container 12 are attached to the closed container 12 by tack welding.
[0021]
The upper cover 66 is fixed to the upper support member 54 from above by four main bolts 78 at the periphery. The main bolts 78 penetrate through the upper support member 54, and their ends are screwed into the lower support member 56 to form the upper cover 66, the upper support member 54, the upper cylinder 38, the intermediate partition plate 36, and the lower cylinder. 40 and the lower support member 56 are integrated. The lower cover 68 is fixed to the lower support member 56 with bolts.
[0022]
As described above, the outer peripheral surface 66A of the upper cover 66 is extended in the axial direction, the outer peripheral surface 66A and the closed container 12 are tack-welded, and the upper support member is separated from the upper surface of the upper cover 66 by the main bolts 78. Since the upper cylinder 38, the intermediate partition plate 36, the lower cylinder 40, and the lower support member 56 are integrated, the upper cylinder 38 and the upper support member 54 adjacent to the upper cylinder 38 corresponding to the portion for compressing the refrigerant are directly sealed in a closed container. Can be attached without welding.
[0023]
Thereby, it is possible to avoid the disadvantage that the upper cylinder 38 and the upper support member 54 are distorted due to heat during welding. Further, since the upper cover 66 extends the outer peripheral surface 66A in the axial direction, the upper cover 66 is less likely to be distorted due to heat generated during tack welding.
[0024]
Further, as described above, in the compressor 10 in which the inside of the sealed container 12 has an intermediate pressure, the gas of the intermediate pressure is discharged into the sealed container 12, so that the gas is compressed by the second rotary compression element 34 and discharged into the discharge muffling chamber 62. The upper cover 66 is formed to have a large thickness so that the refrigerant to be discharged does not leak into the closed container 12 and increase the pressure of the refrigerant in the closed container 12. By welding the container body 12A of the closed container 12, distortion due to heat at the time of welding can be significantly prevented. Furthermore, since the outer peripheral surface 66A of the upper cover 66 is extended in the direction of the rotating shaft 16, the upper cover 66 is less affected by heat. Further, since the outer peripheral surface 66A extends only the outer peripheral surface 66A in the upward direction, the height of the compressor 10 does not increase.
[0025]
Furthermore, the closed container 12 and the upper cover 66 are made of an aluminum material. The aluminum material has a lower strength than an iron-based material, and has a property of being easily distorted when heat is applied. As described above, the upper cover 66 is formed thick, and the outer peripheral surface 66A is also expanded upward, so that generation of distortion can be avoided as much as possible, and the reliability of the compressor 10 can be improved. Become like Further, the weight of the compressor 10 can be further reduced as compared with the case where a conventional steel plate is used. In particular, when the compressor 10 is mounted on a vehicle, the weight of the vehicle is reduced, so that fuel efficiency can be improved.
[0026]
Further, by forming the closed container 12 and the upper cover 66 from the same metal (aluminum material in the embodiment), the weldability can be improved.
[0027]
The electric element 14 is provided above the upper cover 66 at a predetermined interval from the upper cover 66.
[0028]
Heat insulation plates 140 and 141 are provided between the upper and lower surfaces of the upper cylinder 38, that is, between the upper cylinder 38 and the upper support member 54 and between the upper cylinder 38 and the intermediate partition plate 36. These heat insulating plates 140 and 141 are formed by rolling a heat-insulating metal having a low thermal conductivity, for example, a stainless steel plate into a plate shape of 0.3 mm to 0.5 mm. Due to the presence of the heat insulating plate 140, the heat of the high-temperature and high-pressure refrigerant gas discharged into the discharge muffling chamber 62 of the upper support member 54 provided above the upper cylinder 38 is less likely to be transmitted to the upper cylinder 38.
[0029]
In addition, the presence of the heat insulating plate 141 substantially eliminates heat intrusion from the first rotary compression element 32. Thus, the upper cylinder 38 is heated by the high-temperature and high-pressure refrigerant discharged into the discharge muffling chamber 62 and the heat from the first rotary compression element 32, and the refrigerant sucked into the upper cylinder 38 is heated. Since it can be suppressed or avoided, the compression efficiency of the second rotary compression element 34 can be improved.
[0030]
On the other hand, the intermediate partition plate 36 has a substantially donut shape, and an oil supply hole 131 is formed in the intermediate partition plate 36. The oil supply hole 131 is formed by covering the groove formed in the upper surface of the intermediate partition plate 36 (the surface on the upper cylinder 38 side) from the inner peripheral surface to the outside in a predetermined range in the radial direction with the heat insulating plate 141. I have. The outside portion of the oil supply hole 131 communicates with the low pressure chamber side in the upper cylinder 38.
[0031]
A communication hole (vertical hole) 133 is formed in the heat insulating plate 141 at a position corresponding to the end of the oil supply hole 131 on the closed container 12 side. The upper cylinder 38 is provided with an injection communication hole 134 for communicating the communication hole 133 of the heat insulating plate 141 with the suction port 161 (the suction side of the second rotary compression element 34). Here, the opening of the oil supply hole 131 of the intermediate partition plate 36 on the rotation shaft 16 side communicates with an oil hole (not shown) through oil supply holes 82 and 84 formed in the rotation shaft 16.
[0032]
In this case, as will be described later, the inside of the sealed container 12 has an intermediate pressure, so that it becomes difficult to supply oil into the upper cylinder 38, which becomes high in the second stage. The oil that has been pumped up from the oil reservoir at the bottom of the closed container 12 and rises through an oil hole (not shown) and has come out of the oil supply holes 82 and 84 enters the oil supply hole 131 of the intermediate partition plate 36 and passes through the communication holes 133 and 134. The air is supplied to the suction side (suction port 161) of the upper cylinder 38.
[0033]
As the oil as the lubricating oil, for example, existing oils such as mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, and PAG (polyalkyl glycol) are used.
[0034]
In the container main body 12A of the closed container 12, a position corresponding to the suction passage (not shown) of the upper support member 54 and immediately below the electric element 14, and the position corresponding to the suction passage 60 of the lower support member 56 and the discharge muffling chamber 62. In addition, a refrigerant introduction part 92 and a refrigerant introduction part 94 and a refrigerant discharge part 96 are respectively formed.
[0035]
Here, the refrigerant introduction portion 92 is provided between the thick portion 13B integrally formed with the container body 12A of the closed container 12 and the thick portion 13B attached to the outer surface of the thick portion 13B. It is constituted by a lid member 112 (relief means) that forms a refrigerant introduction passage 92A for sucking the refrigerant discharged into the second rotary compression element 34. That is, grooves having a semicircular cross section are formed on the opposing surfaces of the thick portion 13B formed on the container body 12A and the lid member 112, and the thick portions 13B and the lid are formed by opposing these grooves. A coolant introduction passage 92A as a passage shown in FIG.
[0036]
In addition, a communication pipe 93A for communicating the inside of the closed container 12 and the refrigerant introduction passage 92A to the thick portion 13B of the container body 12A, a suction passage (not shown) of the second rotary compression element 34 and a refrigerant introduction passage 92A. A communication pipe 93B that communicates with is provided. A packing (seal material) 114 is provided between the thick portion 13B and the lid member 112 (the entire periphery of the coolant introduction passage 92A), and the lid member 112 is provided via the packing 114 related to the thick portion 13B. It is fixed by bolts 120.
[0037]
The lid member 112 is made of an aluminum material similarly to the container body 12A. The thick portion 13B and the lid member 112 are always in close contact with each other to seal the refrigerant introduction passage 92A from the outside. However, the elasticity of the lid member 112 itself and the diameter (tightening strength) of the bolts 120. By setting, when the pressure of the refrigerant in the closed container 12 rises to a predetermined value, the pressure of the refrigerant flowing into the refrigerant introduction passage 92A causes the lid member 112 itself or the bolt 120 so that the lid member 112 is separated outward. Are deformed, and a gap is formed between the thick portion 13B and the lid member 112. The gap connects the inside and the outside of the refrigerant introduction passage 92 </ b> A, and the medium-pressure refrigerant in the passage escapes to the outside of the closed container 12.
[0038]
With such a configuration, a gap is formed between the lid member 112 and the thick portion 13B when the pressure of the intermediate-pressure refrigerant in the closed container 12 is abnormally increased, and the refrigerant is introduced. Since the refrigerant gas in the sealed container 12 can be released to the outside from the passage 92A, the durability of the compressor 10 is improved, and the reliability can be improved.
[0039]
On the other hand, a support leg 150 is attached to the lower surface of the container body 12A of the closed container 12. The support legs 150 are formed of a thick aluminum plate, and protrude outward from the lower surface of the container body 12A. An elastic mounting 204 of the support device 200 described below is attached to a lower surface of the support leg 150.
[0040]
A support device 200 for supporting the rotary compressor 10 is provided around the closed container 12 of the rotary compressor 10. The support device 200 is provided at a predetermined interval outside the closed container 12 and is attached to the soundproof wall 202 surrounding the closed container 12 and the support legs 150 on the lower surface of the container body 12A of the closed container 12. And an upper elastic support member 207 provided in a hole 206 formed on the upper surface of the soundproof wall 202.
[0041]
The soundproof wall 202 is provided in order to avoid the inconvenience that noise generated during operation of the electric element 14 leaks to the outside, and has a substantially cylindrical shape that covers the outside of the closed casing 12 and is provided inside the engine room of the vehicle. Fixed to. A substantially circular hole 206 is formed at the upper end of the soundproof wall 202, and an upper elastic support member 207 is attached inside the hole 206.
[0042]
The elastic mounting 204 attached to the support legs 150 on the lower surface of the container body 12A is formed to support the lower part of the closed container 12, is made of an elastic material such as hard rubber, and is attached to a bolt (not shown). Attached to the support leg 150. The lower surface of the elastic mounting 204 is fixed to the soundproof wall 202.
[0043]
On the other hand, the upper elastic support member 207 mounted in the hole 206 of the soundproof wall 202 is made of an elastic material such as hard rubber, and has a curved portion 208 which is curved so as to undulate over the entire circumference. I have. The curved portion 208 absorbs the vibration transmitted from the terminal cover 100, and does not transmit the vibration to the soundproof wall 202. An insertion hole 209 for inserting the terminal cover 100 is formed in the center of the upper elastic support member 207. The terminal cover 100 is inserted through the insertion hole 209, and is fixed to the upper elastic support member 207 all around. Thereby, the terminal cover 100 is attached to the inner peripheral surface of the hole 206 of the soundproof wall 202 via the upper elastic support member 207. That is, the terminal cover 100 is supported by the soundproof wall 202 via the upper elastic support member 207.
[0044]
As described above, the lower portion of the rotary compressor 10 is supported by the elastic mounting 204 provided at the lower portion of the sealed container 12 of the rotary compressor 10, and the upper end of the sealed container 12 is supported by the upper elastic support member 207. The disadvantage that the upper portion becomes unstable in the rotary compressor 10 can be eliminated. Further, by forming these with elastic members, it becomes possible to make it difficult to transmit the vibration generated from the rotary compressor 10 to the soundproof wall 202.
[0045]
Next, the operation of the rotary compressor 10 of the present invention having the above configuration will be described. When the stator coil 28 of the electric element 14 of the rotary compressor 10 is energized through the wiring 21 and the terminal 20, the electric element 14 is activated and the rotor 24 rotates. By this rotation, the upper and lower rollers 46 and 48 fitted to the upper and lower eccentric portions 42 and 44 provided integrally with the rotating shaft 16 eccentrically rotate inside the upper and lower cylinders 38 and 40.
[0046]
As a result, the low-pressure refrigerant gas sucked into the low-pressure chamber side of the cylinder 40 from the suction port (not shown) through the refrigerant introduction portion 94 and the suction passage 60 formed in the lower support member 56 is transferred to the roller 48 and the vane (not shown). Is compressed to an intermediate pressure, and is discharged from the intermediate discharge pipe 121 into the closed container 12 through a communication passage (not shown) from the high pressure chamber side of the lower cylinder 40. Thereby, the inside of the sealed container 12 has an intermediate pressure.
[0047]
Then, the intermediate-pressure refrigerant gas in the closed container 12 flows into the communication pipe 93 </ b> A of the refrigerant introduction part 92. In this case, when the pressure of the intermediate-pressure refrigerant gas flowing into the communication pipe 93A is lower than a set value, the illustration formed in the upper support member 54 from the communication pipe 93A through the refrigerant introduction passage 92A and the communication pipe 93B. Through the suction passage, which is not drawn in, from the suction port 161 to the low pressure chamber side of the upper cylinder 38 of the second rotary compression element 34, and the second stage compression is performed by the operation of the roller 46 and the vane (not shown), so that the high pressure and high temperature The refrigerant gas is discharged from the high-pressure chamber through a discharge port (not shown), through a discharge muffling chamber 62 formed in the upper support member 54, and from the refrigerant discharge section 96 to the outside.
[0048]
On the other hand, when the pressure of the intermediate-pressure refrigerant gas compressed by the first rotary compression element 32 and discharged into the closed container 12 rises to a set value, the refrigerant is introduced from the communication pipe 93A of the refrigerant introduction part 92 to the refrigerant introduction passage 92A. As described above, the thick portion 13B and the cover member are deformed by the pressure of the inflowing refrigerant (the cover member 112 is pushed outward and deformed, or the cover member 112 moves outward against the tightening force of the bolts 120...). A gap is formed between the gap and the gap 112. Then, a part of the refrigerant gas in the closed container 12 escapes from the gap to the outside.
[0049]
As a result, as described above, the refrigerant gas in the closed container 12 that has abnormally risen can be escaped to the outside to avoid the occurrence of damage due to the abnormally high pressure. Further, since the pressure in the closed container 12 is regulated to be lower than the set value due to the outflow, the pressure is sucked into the second rotary compression element 34 through the refrigerant introduction passage 92A and the communication pipe 93B, and the second rotary compression element 34 It is possible to avoid a disadvantage that the pressure of the compressed refrigerant is excessively increased.
[0050]
When the pressure in the closed container 12 falls below the set value by the relief function, the gap formed between the thick portion 13B and the lid member 112 is closed.
[0051]
As described above, the upper support member 54, the upper cylinder 38, the intermediate partition plate 36, the lower cylinder 40, and the lower support member 56 are fixed to the upper cover 66, and the upper cover 66 is welded to the sealed container 12, so that the sliding portion The upper cylinder 38 and the upper support member 54 adjacent to the upper cylinder 38 can be attached without directly welding to the closed container 12. Thereby, it is possible to avoid the disadvantage that the upper cylinder 38 and the upper support member 54 are distorted due to heat during welding. Further, since the upper cover 66 extends the outer peripheral surface 66A in the axial direction, the upper cover 66 is less likely to be distorted due to heat generated during tack welding.
[0052]
Further, since the closed container 12 and the upper cover 66 are made of an aluminum material, the weight of the compressor 10 can be further reduced as compared with the case where a conventional steel plate is used.
[0053]
Furthermore, since it is not necessary to use a dedicated holder for mounting as in the related art, the production cost can be reduced.
[0054]
In the present embodiment, the closed container 12 and the upper cover 66 are made of an aluminum material. However, the present invention is not limited to aluminum-based metals and the same. Any material can be used as long as it is welded and fixed using metal.
[0055]
Further, in each of the above embodiments, the vertical internal intermediate pressure type multi-stage (two-stage) compression type rotary compressor is adopted. However, the present invention is not limited thereto, and the horizontal type rotary compressor, the single cylinder type rotary compressor and the rotary compression It may be applied to a multi-stage compression type rotary compressor having one stage, four stages or more rotary compression elements.
[0056]
【The invention's effect】
As described above in detail, according to the present invention, the rotary compression element of the rotary compressor closes the opening surface of the cylinder, and has a support member having a bearing for the rotating shaft, and a recess formed in the support member. And a cover for closing the opening of the discharge muffle chamber, the cylinder and the support member are fixed to the cover, and the cover is fixed to the closed container.For example, the cover is fixed to the closed container by welding. In this case, the closed container and the cylinder or the support member can be attached without directly welding.
[0057]
Thus, the cylinder or the support member is attached to the closed container without being directly exposed to the heat at the time of welding, so that the inconvenience that the cylinder or the support member is distorted can be avoided. In addition, since it is not necessary to use a holder dedicated to mounting unlike the related art, production costs can be reduced.
[0058]
According to the second aspect of the present invention, in addition to the above-mentioned invention, the rotary compression element includes a first rotary compression element and a second rotary compression element, and the refrigerant compressed by the first rotary compression element is sealed in a closed container. The intermediate pressure refrigerant is sucked into the second rotary compression element and compressed, and the cover closes the opening of the discharge muffling chamber of the second rotary compression element. By using a cover formed to be thicker than usual in such a compressor, the compressor can be fixed to a closed container.
[0059]
Thereby, when the cover is fixed to the closed container by welding, distortion due to heat at the time of welding can be significantly prevented.
[0060]
According to the third aspect of the present invention, in addition to the above-mentioned inventions, the peripheral portion of the cover is extended in the axial direction of the rotating shaft. It can be avoided more effectively.
[0061]
According to the invention of claim 4, in addition to the above inventions, the sealed container and the cover are made of an aluminum-based material, so that the total weight of the compressor can be significantly reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an internal intermediate pressure type multistage compression type rotary compressor according to an embodiment to which the present invention is applied.
FIG. 2 is a plan sectional view of the rotary compressor of FIG.
[Explanation of symbols]
Reference Signs List 10 rotary compressor 12 closed container 12A container body 12B end cap 13B thick portion 32 first rotary compression element 34 second rotary compression element 36 intermediate partition plate 38 upper cylinder 40 lower cylinder 54 upper support member 56 lower support member 66 upper Cover 66A Outer peripheral surface 68 Lower cover 92 Refrigerant introduction part 92A Refrigerant introduction passages 93A, 93B Communication pipe 94 Refrigerant introduction part 96 Refrigerant discharge part 100 Terminal cover 102 Bolt 112 Cover member 114 Packing 120 Bolt

Claims (4)

In a rotary compressor including an electric element in a closed container and a rotary compression element driven by a rotation shaft of the electric element,
The rotary compression element, a cylinder, and a closing member that closes an opening surface of the cylinder, and a support member having a bearing for the rotary shaft,
A discharge muffling chamber formed in the support member,
A cover for closing an opening of the discharge muffling chamber,
A rotary compressor, wherein the cylinder and the support member are fixed to the cover, and the cover is fixed to the closed container. The rotary compression element is composed of a first rotary compression element and a second rotary compression element, discharges the refrigerant compressed by the first rotary compression element into the closed container, and discharges the intermediate-pressure refrigerant. While sucking and compressing the second rotary compression element,
The rotary compressor according to claim 1, wherein the cover closes an opening of a discharge muffling chamber of the second rotary compression element. The rotary compressor according to claim 1, wherein a peripheral portion of the cover is extended in an axial direction of the rotation shaft. 4. The rotary compressor according to claim 1, wherein the closed container and the cover are made of an aluminum-based material.

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