JPH06307354A - Scroll compressor - Google Patents

Abstract

PURPOSE:To introduce an appropriate amount of high pressure oil to the slide surfaces of a revolving end plate and a stationary end plate and prevent reduction of the friction loss and the gas leak by furnishing the revolving end plate at its back surface with an oil passage which opens and shuts intermittently with a sliding partition ring. CONSTITUTION:With revolving of an end plate 12, the relative position of the end plate 12 and a sliding partition ring 25 changes in an amount corresponding to the radius of revolution. In any arbitrary position an oil path 50 is provided which opens and shuts in association with this relative movement, and the optimum rate of flow is selected to any desired value by adjusting the opening/ shutting timing with changing of the hole position. The lubricant oil at the discharge pressure bounded by the sliding partition ring 25 which is lower than the discharge pressure applied to the periphery of the end plate back surface 20, is supplied to the slide surfaces of the revolving end plate 12 and a stationary end plate 8. Thereby the friction loss at the slide surfaces is reduced by the supplied lubricant oil while the refrigerant heating with the oil is suppressed, and oil seal is accomplished effectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type electric compressor.

[0002]

2. Description of the Related Art FIG. 6 is a detailed sectional view of a compression mechanism portion of a conventional scroll motor.

The compression mechanism 202 has a fixed spiral vane component 207 having a fixed spiral vane 206 integrally formed on a fixed end plate 205, and a swirl which meshes with the fixed spiral vane 206 to form a plurality of compression work spaces 211. Swirl blade 2
08 is formed on the swirl end plate 209, a swirl spiral blade part 210, a rotation restraint part 212 for preventing rotation of the swirl swirl blade part 210 to rotate only, and a swivel drive bearing 213 provided on the swirl end plate 209. A crankshaft 215 having an eccentric drive shaft 214 for eccentrically rotating the shaft, a bearing part 219 for supporting the main shaft 216 by a main bearing 217, and the like.

The lubricating oil in the lubricating oil sump 204 is the crankshaft 2
05, the main bearing 217, the eccentric drive shaft 214, and the orbiting drive bearing 213.
Is communicated with the oil chamber 230 formed by the engagement.

[0005]

In the above-mentioned prior art, a force for separating the two end plates is generated due to the gas pressure in the compression work space formed by the fixed spiral blade and the swirl spiral blade. Therefore, conversely, it is necessary to apply a pressing force that is stronger than the force of separating by the gas force to the rear surface of the end plate of the turning end plate. With such a configuration, it can be easily expected that a considerably large load is applied to the sliding surfaces of the two end plates that receive these pressing forces, resulting in a large loss. Also, when the swirling spiral blades are tilting and swirling due to imbalance in the compression chamber or pressure leakage, one-sided contact occurs at the contact part, and the swirling end plate is pressed locally with a strong force, resulting in a very large friction loss. It is conceivable that this may cause an increase in gas leakage and the generation of abnormal noise.

Further, in the case of a horizontal scroll compressor, oil collects downward due to the influence of gravity, and it is difficult for the oil to rotate on the upper sliding surface, which causes problems such as loss due to friction. There is.

Further, since the construction in which the oil is directly supplied to the sliding surface of the turning mirror plate and the fixed mirror plate is not used, it is very difficult to optimize the amount of oil to the sliding surface, and when it is insufficient, As described above, when the loss due to friction increases, and when the loss is excessive, on the contrary, it leads to heating of the suction refrigerant, and problems such as a significant drop in efficiency tend to occur.

[0008]

A technical means for solving the above-mentioned problems of the prior art is to provide an appropriate amount of high pressure oil by providing an oil passage on the back surface of the swivel end plate which is opened and closed intermittently by a sliding partition ring. Is guided to the sliding surface of the turning end plate and the fixed end plate.

The problem of the horizontal scroll compressor can be solved by designating the position of the oil passage by the angle from the vertical direction.

[0010]

With the above structure, since the positions of the swivel end plate and the sliding partition ring move relative to each other by the turning radius due to the swiveling motion of the swivel end plate, an oil passage is provided at an arbitrary position to be opened and closed by this relative motion. The optimum flow rate can be arbitrarily selected by adjusting the opening / closing timing by changing the hole position, and the oil can be surely guided to the sliding surface of the swivel end plate and the fixed end plate. As a result, it is possible to reduce the friction loss on the sliding surface by the supplied lubricating oil while suppressing the heating of the refrigerant by the oil, and it is possible to efficiently perform the oil seal on the sliding surface.

Further, in the case of a horizontal scroll compressor, by designating the position of the angle, it is possible to reliably supply the oil at an optimum flow rate to the sliding surface of the vertically upper portion where the oil normally does not rotate. be able to.

Furthermore, by providing an oil holding mechanism on the swivel end plate, a higher performance oil lubrication mechanism can be achieved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, FIG. 1 is a longitudinal sectional view of a scroll type electric compressor, FIG. 2 is a partially enlarged view of a compression mechanism portion of a first embodiment and a detailed view of opening and closing of an oil passage, FIG. FIG. 4 is a partially enlarged view of the compression mechanism portion of the second embodiment, and FIG. 4 is a detailed view of the swirling spiral blade of the third embodiment.

The compression mechanism 2 is fixed inside the closed container 1,
The stator 4 of the electric motor 3 for driving the electric motor 3 is fixed above, the crankshaft 6 for driving the compression mechanism 2 is connected to the rotor 5 of the electric motor 3, and the periphery of the compression mechanism 2 under the closed container 1 is lubricated. Use oil sump 7.

The compression mechanism 2 includes a fixed scroll vane component 10 having a fixed scroll vane 9 formed integrally with a fixed end plate 8 and a plurality of compression work spaces 1 that mesh with the fixed scroll vane 9.
4, a swirling spiral vane component 13 in which swirling spiral vanes 11 forming 4 are formed on a swirling end plate 12, and a rotation restraint component 1 for preventing the swirling spiral vane component 13 from rotating and only rotating.
5, an eccentric bearing 17 provided inside the main shaft 18 of the crankshaft 6 and the rotary drive shaft 16 provided on the opposite side of the rotary spiral blade 11 of the rotary end plate 12, and an eccentric bearing 17 into which the rotary drive shaft 16 is fitted; Bearing part 21 having a main bearing 19 for supporting the main shaft 18 of the main shaft 18 and a rear end plate 20 of the rear end of the swivel end plate 12.
This swirling spiral blade part 1
A plane plate component 24 having an axial movement limiting flat surface 23 for limiting the axial movement of 3 is arranged. The flat plate component 24 is provided with a sliding partition ring 25 for partitioning the gas pressure applied to the rear surface 20 of the mirror plate into a discharge pressure applied to the central portion and a pressure lower than the discharge pressure applied to the outer periphery of the rear surface 20 of the mirror plate.

Discharge is carried out to a discharge chamber 37 below the electric motor 3 between the electric motor 3 and the compression mechanism 2 through a discharge passage 35 provided on the outer periphery of the fixed end plate 8 and a discharge passage 36 provided in the bearing component 21. The discharged refrigerant gas passes through the electric motor peripheral passage 38 and is guided from the discharge pipe 39 to the outside of the compressor.

Lubricating oil lubricates the main bearing 19, the swing drive shaft 16 and the eccentric bearing from the lower lubricating oil reservoir via the oil pump 40 from the oil supply passage which penetrates the main shaft of the crankshaft 6. Further, some oil enters the suction side compression work space from the mirror back surface 20.

In the embodiment shown in FIG. 2, the turning end plate 12 is provided with an oil passage 50 so that the lubricating oil at the discharge pressure partitioned by the sliding partition ring 25 slides between the turning end plate 12 and the fixed end plate 8. Leads to the surface. Further, FIG. 3 shows a state in which the oil passage 50 is opened and closed by the sliding partition ring 25 by the turning motion of the turning end plate 12. By adjusting the opening / closing timing by changing the position of the oil passage, the amount of oil flowing through the oil passage can be arbitrarily set.

FIG. 4 shows an embodiment in the case of a horizontal scroll compressor. Normally, by setting the setting direction of the oil passage to an arbitrary angle within 45 ° with respect to the vertically upward direction, the lubricating oil is normally used. Lubricating oil can be supplied to the upper sliding surface, which is difficult to rotate.

In FIG. 5, an arcuate groove communicating with the oil passage 50 is provided as an oil holding mechanism on the sliding surface of the swivel end plate 12.

[0021]

As described above, the effect of claim 1 of the present invention is that the optimum amount of oil can be reliably sent to the sliding surface of the swivel end plate and the fixed end plate, so that the swivel end plate and the fixed end plate slide. By achieving a good lubrication condition on the surface, friction loss can be reduced, and good contact between the swivel end plate and the fixed end plate can be maintained to prevent gas leakage.

The effect according to claim 2 of the present invention is that, as described above, in the horizontal scroll compressor, the optimum amount of oil can be surely sent to the sliding portion in the vertically upward direction where the lubricating oil is usually hard to rotate. By achieving a good lubrication condition on the sliding surfaces of the swivel end plate and the fixed end plate, friction loss can be reduced, and good contact between the swivel end plate and the fixed end plate can be maintained to prevent gas leakage.

The effect according to claim 3 of the present invention is further effectively provided by providing an arcuate groove communicating with an oil passage as an oil holding mechanism on the sliding surface of the swivel end plate. The scroll compressor according to Item 2 can be realized.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a scroll compressor according to the present invention.

FIG. 2 is a sectional view of the same main part.

FIG. 3 (a) is a schematic view of opening and closing an oil passage by a sliding partition ring, and (b) is a schematic view of the same.

FIG. 4A is a sectional view of a main part of a scroll compressor according to another embodiment of the present invention, and FIG. 4B is a side view of the main part.

[Fig. 5] Side view of the oil holding mechanism

FIG. 6 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3 Electric motor 4 Electric motor stator 5 Electric motor rotor 6 Crankshaft 7 Lubricating oil sump 8 Fixed end plate 9 Fixed spiral blade 10 Fixed spiral blade part 11 Swirling spiral blade 12 Swirling mirror plate 13 Swirling blade part 14 Compression working space 15 rotation restraint parts 16 swivel drive shaft 17 eccentric bearing 18 main shaft 19 main bearing 20 swivel mirror plate rear face 21 bearing parts 25 sliding partition ring 26 axial movement restricted movable plane 28 annular spring 30 suction pipe 32 suction port 33 discharge port 34, 37 Discharge chamber 35, 36, 38 Discharge passage 39 Discharge pipe 40 Oil pump 50 Oil passage 51 Oil holding mechanism

Front page continuation (72) Inventor Hideo Hirano 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. An electric motor and a compression mechanism which is driven by the electric motor and exerts a discharge side pressure on the electric motor are disposed inside a closed container, and the compression mechanism forms a fixed spiral blade on a fixed end plate. A fixed swirl vane member and a swirl swirl vane member having swirl swirl vanes formed on the swirl end plate to mesh with the fixed swirl vane to form a plurality of compression work spaces. The peripheral plane of the swivel end plate is slidably abutted, and an axial direction limiting plate is provided on the back surface of the swivel end plate through a minute gap, and the discharge side pressure of the compression mechanism is located on the center side of the back surface of the swivel end plate. Is provided, and a back pressure partition strip is provided on the outer side of the gap to slidably seal and partition the gap so that a pressure smaller than the discharge pressure acts.
At least one oil passage is provided so that the discharge side pressure acts on the lubricating oil inside the back pressure divider, and the back pressure divider provided on the back surface of the swivel end plate intermittently opens and closes the oil passage. A scroll compressor that guides the high-pressure oil to the sliding surface between the fixed spiral blade member and the orbiting end plate from the. 2. An electric motor and a compression mechanism which is driven by the electric motor and exerts a discharge side pressure on the electric motor, the compression mechanism forming a fixed spiral vane on a fixed end plate. A fixed swirl vane member and a swirl swirl vane member having swirl swirl vanes formed on the swirl end plate to mesh with the fixed swirl vane to form a plurality of compression work spaces. The peripheral plane of the swivel end plate is slidably abutted, and an axial direction limiting plate is provided on the back surface of the swivel end plate through a minute gap, and the discharge side pressure of the compression mechanism is located on the center side of the back surface of the swivel end plate. Is provided, and a back pressure partition strip is provided on the outer side of the gap to slidably seal and partition the gap so that a pressure smaller than the discharge pressure acts.
At least one oil passage is provided which allows the discharge side pressure to act on the lubricating oil inside the back pressure divider, and which is intermittently opened and closed by the back pressure divider provided on the back surface of the swivel end plate. A horizontal scroll compressor whose passages are set within 45 ° to the vertical direction. 3. The oil retaining means according to claim 1 or 2, wherein the swivel end plate has an arcuate groove communicating with the oil groove.
The scroll compressor described.