JP2001073977A - Two-stage compression type rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent inflow of leak gas to a slide part on the lower stage side and to perform excellent lubrication by a method wherein leak gas is discharged in a closed container through a spiral oil groove and a gas bleed hole. SOLUTION: A two-cylinder type two-stage compression type rotary compressor 10 comprises upper and lower cylinders 38 and 40 provided with an electric motor 14 situated at the inner upper part of a cylindrical closed container 12 having an oil reservoir formed in its bottom and a rotary compression mechanism 18 coupled to the crank shaft 16 of the electric motor for drive situated at a lower part and forming a compression chamber through an intermediate partition plate 36; upper and lower rollers 46 and 48 coupled to the upper and lower eccentric parts 42 and 44 of a crank shaft 16 in the respective cylinders; and compression elements 32 and 34 on the low and high stage sides containing upper and lower vanes 50 and 52 making contact with the respective rollers and partitioning the interior of the cylinders into high and low pressure chambers. Further, the opening surfaces of the upper and lower cylinders are closed by upper and lower support members 54 and 56 used additionally as the bearing part of the crank shaft 16, and spiral oil grooves 82 and 84 inclined in a direction in which oil flows in the intermediate partition plate 36 are formed in the upper and lower eccentric parts 42 and 44, and a gas bleed hole 86 is horizontally formed in the intermediate plate 36.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-stage compression type rotary compressor, and more particularly to a two-cylinder type two-stage compression type rotary compressor in which the internal space of a closed vessel is set at a low or intermediate pressure.

[0002]

2. Description of the Related Art Conventionally, in a so-called internal high pressure type rotary compressor in which the internal space of a closed vessel containing an electric element and a rotary compression element driven by a crankshaft connected to the electric element is pressurized by refrigerant gas discharged, ,
A straight groove is provided with a horizontal hole communicating with the oil hole at the center of the crankshaft, and there is no leakage of refrigerant gas from the compression chamber formed in the cylinder of the rotary compression element to the eccentrically rotating roller side, but the internal space of the sealed container In a so-called internal low pressure (or intermediate pressure) type rotary compressor in which the pressure is low or intermediate pressure, each sliding portion, for example, a crankshaft and its bearing, or a leakage gas from the high pressure compression chamber (high pressure chamber) to the roller side, or Oil supply to the eccentric part of the crankshaft and the rollers is hindered.

In a two-stage compression type rotary compressor, when the high-stage side, that is, the second stage compression element is located on the low-stage side, ie, below the first stage compression element, the high-pressure side, A gas leak occurs from the compression chamber (high-pressure chamber) to the inside of the roller, and this leak gas causes an insufficient oil seal of the lower-stage compression element located on the upper side, thereby lowering the efficiency of the lower-stage side.

[0004]

In particular, in the case of a CO2 refrigerant having little influence on the global environment and having no flammability or toxicity, the molecular size is CFC (chlorofluorocarbon).
Since the flow rate is smaller and the amount of leak gas is larger, the efficiency is significantly reduced. Further, in the case of the two-stage compression type, there is a problem that the performance of the entire compressor including the high-stage side is reduced due to the performance reduction on the low-stage side.

[0005] Therefore, a main object of the present invention is to provide a two-stage compression type rotary compressor capable of preventing leak gas from a high-pressure chamber and improving oil lubrication for each sliding portion with a simple structure. .

[0006]

SUMMARY OF THE INVENTION The present invention provides a closed container having an oil reservoir at the bottom, a motor disposed in an upper space in the closed container, and a crank disposed in a lower space in the closed container and connected to the motor. The rotary compression mechanism is driven by a shaft, and the rotary compression mechanism closes the opening surfaces of the low-stage compression element and the high-stage compression element, and each compression element, which are arranged via an intermediate partition plate, and closes the crankshaft. In a two-stage compression type rotary compressor including an upper support member and a lower support member that also serves as a bearing portion, a low-stage compression element is arranged above an intermediate partition plate, and an oil groove of an upper and lower eccentric portion provided on a crankshaft. Is a two-stage compression type rotary compressor characterized in that an inclination is set in a direction in which oil flows into the intermediate partition plate, and a vent hole is formed in the intermediate partition plate in a horizontal direction.

The present invention also provides a closed container having an oil reservoir at the bottom, a motor disposed in an upper space in the closed container, and a crankshaft disposed in a lower space in the closed container and connected to the motor. Rotating compression mechanism,
The rotary compression mechanism includes a low-stage compression element and a high-stage compression element arranged via an intermediate partition plate, and an upper support member and a lower support member which close an opening surface of each compression element and also serve as a bearing of a crankshaft. In the two-stage compression type rotary compressor including the member, the low-stage compression element is arranged below the intermediate partition plate, and the oil groove of the upper and lower eccentric part provided on the crankshaft is in the direction in which oil flows into the upper support member. A two-stage compression type rotary compressor characterized in that an inclination is provided and a gas vent hole is formed in a horizontal direction in an upper support member.

[0008]

When the low-stage compression element is disposed above the intermediate partition plate, the oil groove of the vertical eccentric portion of the crankshaft is installed so as to be inclined in the direction in which oil flows into the intermediate partition plate.
Leak gas is discharged into a closed container from a vent hole provided in the intermediate partition plate.

Further, when the low-stage compression element is disposed below the intermediate partition plate, since the oil groove of the upper and lower eccentric portion is installed so as to be inclined in the direction in which oil flows into the upper support member, leak gas is reduced. The gas is discharged into the closed container through a gas vent hole provided in the upper support member.

[0010]

According to the present invention, the leak gas is prevented from flowing into each sliding portion on the lower stage side by the oil groove and the gas vent hole,
Good oil lubrication and reliability can be ensured.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the accompanying drawings.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An internal low-pressure two-cylinder two-stage compression type rotary compressor 1 according to an embodiment of the present invention shown in FIG.
Numeral 0 denotes a cylindrical airtight container 12 made of a steel plate, an electric motor 14 arranged in an upper space of the airtight container 12,
4 and includes a rotary compression mechanism 18 driven by a crankshaft 16 connected to the electric motor 14. The hermetically sealed container 12 has an oil reservoir at the bottom, and has a container body 12 containing an electric motor 14 and a rotary compression mechanism 18.
A and a lid 1 for sealing the upper opening of the container body 12A.
2B, and an electric motor 14 on the lid 12B.
Terminal for supplying external power to the device (wiring omitted) 2
0 is attached.

The electric motor 14 has a stator 22 mounted annularly along the inner periphery of the upper space of the sealed container 12.
And a rotor 24 arranged with a slight gap inside the stator 22. The rotor 24 is provided integrally with a crankshaft 16 extending vertically through the center thereof.

The stator 22 has a laminated body 26 in which ring-shaped electromagnetic steel sheets are laminated, and a plurality of coils 28 wound around the laminated body 26. Also, the rotor 24 is
This is an AC motor constituted by a laminated body 30 of electromagnetic steel sheets in the same manner as the motor 22. It is also possible to use a DC motor in which permanent magnets are embedded.

The rotary compression mechanism 18 includes a low-stage compression element 32.
And the low-stage compression element 32
Is disposed above the intermediate partition plate 36, and the high-stage compression element 3
4 is arranged below the intermediate partition plate 36. That is, an intermediate partition plate 36, upper and lower cylinders 38 and 40 provided above and below the intermediate partition plate 36, and an upper and lower eccentric portion 4 provided inside the upper and lower cylinders 38 and 40 on the crankshaft 16.
Upper and lower rollers 46 and 48 connected to and rotated by
The lower and upper cylinders 38 and 40 are brought into contact with the upper and lower rollers 46 and 48 to form a low pressure chamber (suction side) and a high pressure chamber (discharge side).
Upper and lower vanes 50 and 52 and upper and lower cylinders 3
An upper support member 54 and a lower support member 56 that close the respective opening surfaces of the crankshafts 8 and 40 and also serve as the bearings of the crankshaft 16. The upper support member 54 and the lower support member 56 have suction passages 58, 60 (not shown) and discharge muffle chambers 62, 6, which are communicated with the upper and lower cylinders 38, 40 as appropriate.
4 are formed respectively, and each of these muffling chambers 62, 64
Is closed by an upper plate 66 and a lower plate 68. The upper and lower vanes 50 and 52 are the upper and lower cylinders 3
Radial guide grooves 7 formed in the cylinder walls 8 and 40
0, 72 and reciprocally slidable, and a spring 7
The rollers 4 and 76 are urged to always contact the upper and lower rollers 46 and 48.

The upper cylinder 38 performs a first-stage (low-pressure side) compression operation, and the lower cylinder 40 performs a second-stage (high-pressure side) compression of the refrigerant gas compressed by the upper cylinder 38 in the first stage. A compression action is performed.

The elements constituting the rotary compression mechanism 18 are arranged in the order of an upper support member 54, an upper cylinder 38, an intermediate partition plate 36, a lower cylinder 40 and a lower support member 56, and an upper plate 66 and a lower plate 68.
And are integrally connected using a plurality of mounting bolts 78.

Then, as shown in FIG.
6, a vertical oil hole 80 is formed at the center of the shaft, and a vertically extending eccentric portion 42, 44 of the crankshaft 16 has a helical oil groove inclined in a direction in which lubricating oil flows into the intermediate partition plate 36. 82 and 84 are formed respectively, and a gas vent hole 86 is formed in the intermediate partition plate 36 in the horizontal direction. The spiral oil grooves 82 and 84 communicate with oil holes 80 provided in the crankshaft 16 through oil supply holes 83 and 85 provided in the lateral direction.

As the refrigerant, carbon dioxide (CO2), which is a natural refrigerant, is used in consideration of the global environment, flammability and toxicity, and the lubricating oil is, for example, mineral oil (mineral oil) or alkylbenzene. Existing oils such as oil, ether oil and ester oil are used.

The upper support member 54 and the lower support member 56 have suction passages 58, 60 and a discharge muffling chamber 62,
Upper and lower refrigerant introduction pipes 88 and 90 for introducing the refrigerant to the upper and lower cylinders 38 and 40 via 64 and upper and lower refrigerant discharge pipes 92 and 94 for discharging the compressed refrigerant are connected respectively.
Refrigerant pipes 96, 98, 100, and 102 are connected to the upper and lower refrigerant introduction pipes 88, 90 and the upper and lower refrigerant discharge pipes 92, 94, respectively. Further, the refrigerant pipe 98
An accumulator 104 is connected between and. A mounting pedestal 106 is fixed to the outer bottom of the cylindrical airtight container 12 by welding or the like.

Next, an outline of the operation of the above embodiment will be described.

First, when the motor 14 is energized through the terminal 20 and wiring (not shown), the motor 14
Is started, and the crankshaft 16 fixed to the rotor 24 rotates. This rotation causes the vertical eccentric portion 4 of the crankshaft 16 to rotate.
The upper and lower rollers 46 and 48 connected to the upper and lower cylinders 44 rotate eccentrically in the upper and lower cylinders 38 and 40.

Thus, the refrigerant pipe 96 and the refrigerant introduction pipe 8
The low-pressure refrigerant gas sucked into the low-pressure chamber 38a of the upper cylinder 38 from the suction port 108 through the suction passage 58 formed in the upper support member 54 as shown in FIG.
The first-stage compression is performed by the operation of the upper roller 46 and the upper vane 50, and the high-pressure chamber 38 b of the upper cylinder 38 discharges the discharge port 110 and the discharge muffling chamber 6 formed in the upper support member 54.
2. Closed container 1 from refrigerant discharge pipe 92 and refrigerant pipe 98
The gas is sent out to the accumulator 104 disposed outside to perform gas-liquid separation.

Next, from the accumulator 104, through the refrigerant pipe 100, the refrigerant introduction pipe 90, and the suction passage 60 formed in the lower support member 56, as shown in FIG. The intermediate-pressure refrigerant gas introduced into the first cylinder is compressed by the operation of the lower roller 48 and the lower vane 52 in the second stage to become a high-pressure compressed gas, from the high-pressure chamber 40 b of the lower cylinder 40 to the discharge port 111, The refrigerant is sent to an external refrigerant circuit (not shown) constituting a refrigeration cycle via a discharge muffling chamber 64, a refrigerant discharge pipe 94, and a refrigerant pipe 102 formed in the refrigeration cycle.

As the crankshaft 16 rotates, the lubricating oil (not shown) stored at the bottom of the closed casing 12 is formed at the center of the crankshaft 16 as shown in FIG. And oil is supplied to the bearings and the upper and lower eccentric portions 42 and 44 from the horizontal oil supply holes 112, 83 and 85 provided on the way. The refrigerant gas contained in the oil is discharged from the spiral oil grooves 82 and 84 formed in the upper and lower eccentric portions 42 and 44 through the gas vent holes 86 provided in the intermediate partition plate 36 into the closed container 12.

Therefore, the supply of the lubricating oil to each sliding portion on the low pressure side by the leak gas is not hindered.

Next, a two-cylinder two-stage compression type rotary compressor 10 as another embodiment shown in FIG. 2 will be described.

This embodiment is different from the first embodiment in the following three points in terms of configuration, and accordingly, refrigerant introduction pipes 88 and 90, refrigerant discharge pipes 92 and 94, and refrigerant pipes Other configurations are the same except that the connection positions of 96, 98, 100, and 102 are changed, and description thereof is omitted.

First, the low-stage compression element 32 of the rotary compression mechanism 18 is disposed below the intermediate partition plate 36, and the high-stage compression element 34 is disposed above the intermediate partition plate 36. Next, there is no gas vent hole 86 in the intermediate partition plate 36, and the gas vent hole 86 is formed in the upper support member 54 in the horizontal direction. Then, as shown in FIG. 5, spiral oil grooves 82, 8 formed in the upper and lower eccentric portions 42, 44 of the crankshaft 16.
4 are both provided so as to rise to the right. In addition,
As shown in FIG. 6, the spiral oil grooves 82 and 84 communicate with oil holes 80 provided in the center of the crankshaft 16 through oil supply holes 83 and 85 provided in the lateral direction to receive oil.

Therefore, when the motor 14 is activated by energizing the motor 14 via the terminal 20 and the wiring (not shown), the upper and lower rollers 46 connected to the upper and lower eccentric portions 42 and 44 by the rotation of the crank rotation shaft 16. , 4
8 rotates eccentrically in the upper and lower cylinders 38 and 40. Due to the eccentric rotation, the refrigerant gas is compressed in the upper and lower cylinders 38 and 40. That is, the lower cylinder 38 performs the first-stage compression, and the upper cylinder 40 performs the second-stage compression.

As the crankshaft 16 rotates, the lubricating oil stored at the bottom of the closed casing 12 is filled with oil holes 80 extending vertically along the axis of the crankshaft 16.
The horizontal lubrication holes 112, 11
The oil is supplied to the bearings and the vertical eccentric parts 42 and 44 from 3, 83 and 85. On the other hand, the leak gas contained in the lubricating oil passes through the oil supply holes 83 and 85 and the vertical eccentric portions 42 and 44
Spiral oil grooves 82, 8 formed in one direction and inclined in one direction
4 and is discharged into the closed container 12 through a lateral gas vent hole 86 provided in the upper support member 54.

Accordingly, the helical oil grooves 82, 84 provided in the upper and lower eccentric portions 42, 44 of the crankshaft 16 leak gas.
And a lateral gas vent hole 86 formed in the upper support member 54
By this, it is possible to prevent discharge and inflow into the sliding portion on the lower stage side, to perform good oil lubrication, and to ensure reliability.

In each of the above-described embodiments, the inside of the closed vessel 12 is of a low pressure type. However, the first-stage compressed gas is discharged into the closed vessel 12 and the compressed gas is discharged to the second-stage. The same effect can be obtained by an intermediate pressure type in which the discharge gas of the second stage is sent out of the closed container as a suction gas through a pipe.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of an internal low-pressure two-cylinder two-stage compression type rotary compressor showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of an internal low-pressure two-cylinder two-stage compression rotary compressor showing another embodiment.

FIG. 3 is an illustrative view schematically showing a main part configuration of each compression unit in FIGS. 1 and 2;

FIG. 4 is a perspective view of a main part of the crankshaft including a vertical eccentric part in FIG. 1;

FIG. 5 is a perspective view of a main part of a crankshaft including a vertical eccentric part in FIG. 2;

FIG. 6 is a sectional view taken along the line AA in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Two-stage compression type rotary compressor 12 ... Cylindrical closed container 14 ... Electric motor 16 ... Crankshaft 18 ... Rotary compression mechanism 32 ... Low-stage compression element 34 ... High-stage compression element 36 ... Intermediate partition plate 38,40 ... Cylinders 42, 44 Vertical eccentric portions 46, 48 Vertical rollers 50, 52 Vertical vanes 54, 56 Upper support member and lower support member 58, 60 Suction passages 62, 64 Discharge silence chambers 82, 84 spiral Oil groove 83, 85 ... Oil supply hole 86 ... Gas vent hole

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takashi Yamakawa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Atsushi Oda 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Takeo Komatsubara 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Prefecture In-house Sanyo Electric Co., Ltd. 5-5-5 Sanyo Electric Co., Ltd. F-term (reference) 3H029 AA04 AA09 AA13 AA21 AB03 BB06 BB42 CC16 CC17 CC22 CC23 CC33

Claims (4)

[Claims] 1. A closed container having an oil reservoir at the bottom, a motor disposed in an upper space in the closed container, and a rotation driven by a crankshaft disposed in a lower space in the closed container and connected to the motor. A compression mechanism is provided, and the rotary compression mechanism also serves as a low-stage compression element and a high-stage compression element, which are arranged via an intermediate partition plate, and a bearing portion of the crankshaft by closing an opening surface of each compression element. A two-stage compression type rotary compressor including an upper support member and a lower support member, wherein the low-stage side compression element is arranged above the intermediate partition plate, and an oil groove of an upper and lower eccentric portion provided on the crankshaft is provided. A two-stage compression type rotary compressor, wherein an inclination is set in a direction in which oil flows into the intermediate partition plate, and a vent hole is formed in the intermediate partition plate in a horizontal direction. . 2. A closed container having an oil reservoir at the bottom, a motor disposed in an upper space in the closed container, and a rotation driven by a crankshaft disposed in a lower space in the closed container and connected to the motor. A compression mechanism is provided, and the rotary compression mechanism also serves as a low-stage compression element and a high-stage compression element, which are arranged via an intermediate partition plate, and a bearing portion of the crankshaft by closing an opening surface of each compression element. A two-stage compression type rotary compressor including an upper support member and a lower support member, wherein the low-stage compression element is arranged below the intermediate partition plate, and an oil groove of an upper and lower eccentric portion provided on the crankshaft. A two-stage compression type rotary compressor, wherein an inclination is set in a direction in which oil flows into the upper support member, and a vent hole is formed in the upper support member in a horizontal direction. Ssa. 3. The two-stage compression type rotary compressor according to claim 1, wherein the internal pressure of the closed container is set to a low pressure or an intermediate pressure. 4. The two-stage compression type rotary compressor according to claim 1, wherein the refrigerant compressed by said rotary compression mechanism is carbon dioxide (CO2).