JP3278971B2 - Scroll compressor - Google Patents

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 of a conventional scroll motor.

The compression mechanism 202 includes a fixed spiral blade part 207 having a fixed spiral blade 206 integrally formed on a fixed head plate 205, and a swivel for meshing with the fixed spiral blade 206 to form a plurality of compression work spaces 211. Swirl blade 2
08 is formed on a rotating head plate 209, a rotation restricting member 212 for preventing the rotation of the rotating spiral blade member 210 and performing only rotation, and a rotation drive bearing 213 provided on the rotating head plate 209. Of the crankshaft 215 having an eccentric drive shaft 214 for eccentrically rotating the shaft and a bearing part 219 for supporting the main shaft 216 of the crankshaft 216 with a main bearing 217.

[0004] The lubricating oil in the lubricating oil reservoir 204, the crank shaft 2
The main bearing 217, the eccentric drive shaft 214 and the turning drive bearing 213 are provided from an eccentric oil supply passage 229 penetrating through the 15 main shafts 216.
Communicate with the oil chamber 230 formed by the engagement.

[0005]

In the above prior art, the gas pressure in the compression working space formed by the fixed swirl vanes and the swirl swirl vanes generates a force for separating the two end plates. Therefore, on the contrary, it is necessary to apply a pressing force stronger than a force for separating the head by the gas force to the back surface of the turning head. In such a configuration, it can be easily expected that a considerably large load is applied to the sliding surfaces of the two end plates receiving these pressing forces, resulting in a large loss. In addition, when the swirling swirl blade is tilting and rotating due to unbalance or pressure leakage in the compression chamber, a one-sided contact occurs at the contact part, and the rotating head plate is pressed with a strong local force, resulting in a very large friction loss. It is considered that this causes an increase in gas leakage and abnormal noise.

Further, in the case of a horizontal scroll compressor, oil collects under the influence of gravity, so that the oil does not easily flow on the upper sliding surface, and problems such as loss due to friction are likely to occur. I have.

In addition, since no oil is directly supplied to the sliding surface between the rotating head plate and the fixed head plate, it is very difficult to optimize the amount of oil on the sliding surface. As described above, the loss due to friction increases. Conversely, when the loss is excessive, the suction refrigerant is heated, and problems such as a significant decrease in efficiency are likely to occur.

[0008]

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

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

[0010]

According to the above construction, the position of the turning head plate and the sliding partition ring are relatively moved by the turning radius due to the turning movement of the turning head plate. Therefore, an oil passage is provided at an arbitrary position which is opened and closed by this relative movement. By adjusting the opening / closing timing by changing the position of the hole, the optimum flow rate can be arbitrarily selected, and the oil can be reliably guided to the sliding surface between the turning head plate and the fixed head plate. Thus, friction loss on the sliding surface can be reduced by the lubricating oil supplied while suppressing the heating of the refrigerant by the oil, and the oil seal on the sliding surface can be performed efficiently.

Also, in the case of a horizontal scroll compressor, by specifying the position of the scroll compressor at an angle, the oil is surely supplied at an optimum flow rate to the sliding surface of the vertical upper portion where the oil is not easily turned. be able to.

Further, by providing an oil holding mechanism on the revolving head plate, a higher performance oil lubrication mechanism can be achieved.

[0013]

FIG. 1 is a longitudinal sectional view of a scroll-type electric compressor, FIG. 2 is a partially enlarged view of a compression mechanism of a first embodiment, and FIG. FIG. 4 is a partially enlarged view of a compression mechanism of the second embodiment, and FIG. 4 is a detailed view of the swirling spiral blade of the third embodiment.

A compression mechanism 2 and a stator 4 of a motor 3 for driving the compression mechanism 2 are fixed inside the closed casing 1, and a crank 5 for driving the compression mechanism 2 is connected to a rotor 5 of the motor 3.
The bottom of the sealed container 1 is used as a lubricating oil reservoir 7.

The compression mechanism 2 includes a fixed scroll blade part 10 having a fixed scroll blade 9 integrally formed with a fixed head plate 8, and a plurality of compression working spaces 1 engaged with the fixed scroll blade 9.
A swirl-vane component 13 in which a swirl-vane 11 forming a part 4 is formed on a revolving head plate 12 and a rotation-restricting component 1 that prevents the revolving-vortex-blade component 13 from rotating and only turns.
5, an eccentric bearing 17 provided inside the main shaft 18 of the crankshaft 6 and a turning drive shaft 16 provided on the side of the turning head plate 12 opposite to the swirling spiral blade 11 and fitted with the turning drive shaft 16; A bearing component 21 having a main bearing 19 for supporting the main shaft 18 and an axial movement limiting plane 23 for limiting the axial movement of the swirling spiral blade component 13 with a small gap from the back surface 20 of the rotating end plate. Is provided. The flat plate component 24 is provided with a sliding partition ring 25 for partitioning the gas pressure applied to the head back surface 20 into a discharge pressure applied to the center portion and a pressure lower than the discharge pressure applied to the outer periphery of the swivel head back surface 20. Set up.

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

The lubricating oil lubricates the main bearing 19, the turning drive shaft 16 and the eccentric bearing from the lower lubricating oil reservoir 7 via an oil pump 40 through an oil supply passage penetrating the main shaft of the crankshaft 6. Also, some oil enters the suction-side compression working space from the swivel head back surface 20.

In the embodiment shown in FIG. 2, an oil passage 50 is provided in the revolving head plate 12 so that the lubricating oil at the discharge pressure partitioned by the sliding partition ring 25 slides between the revolving head plate 12 and the fixed head plate 8. On the surface. FIG. 3 shows a state in which the oil passage 50 is opened and closed by the sliding partition ring 25 by the turning movement 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, in which the setting direction of the oil passage is set at an arbitrary angle within 45 ° with respect to the vertically upward direction, so that the lubricating oil is normally used. The lubricating oil can also be supplied to the upper sliding surface that is difficult to rotate.

FIG. 5 shows a configuration in which an arc-shaped groove communicating with an oil passage 50 is provided as an oil holding mechanism on the sliding surface of the revolving head plate 12.

[0021]

According to the first aspect of the present invention, the optimum amount of oil can be reliably fed to the sliding surface between the rotating head plate and the fixed head plate as described above, so that the sliding movement between the rotating head plate and the fixed head plate can be achieved. By achieving good lubrication on the surface, friction loss can be reduced, and good contact between the rotating head plate and the fixed head plate can be maintained to prevent gas leakage.

The advantage of the second aspect of the present invention is that, as described above, in a horizontal scroll compressor, an optimal amount of oil can be surely sent to a vertically upward sliding portion where lubricating oil is usually difficult to rotate. By achieving good lubrication on the sliding surface between the turning head and the fixed head, friction loss can be reduced, and good contact between the turning head and the fixed head can be maintained to prevent gas leakage.

According to a third aspect of the present invention, an arc-shaped sliding surface of the revolving head plate communicates with an oil passage as oil holding means .
By providing the oil holding groove, the scroll compressor according to claim 1 or 2 can be more effectively realized.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of an essential part of the same.

FIG. 3A is a schematic view of opening and closing an oil passage by a sliding partition ring, and FIG.

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

FIG. 5 is a schematic side view of the oil holding mechanism.

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression mechanism 3 Electric motor 4 Electric motor stator 5 Electric motor rotor 6 Crankshaft 7 Lubricating oil reservoir 8 Fixed head plate 9 Fixed spiral blade 10 Fixed spiral blade part 11 Rotating spiral blade 12 Rotating blade plate 13 Rotating blade part 14 Compression work space REFERENCE SIGNS LIST 15 rotation restricting component 16 turning drive shaft 17 eccentric bearing 18 main shaft 19 main bearing 20 turning head back 21 bearing component 25 sliding partition ring 26 axial movement restriction 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 groove

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideo Hirano 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) F04C 18/02 311 F04C 29/00 F04C 29/02 311 F04C 29/02 321

Claims (3)

(57) [Claims] 1. An electric motor and a compression mechanism driven by the electric motor and applying a discharge-side pressure to the electric motor are disposed inside the closed container, and the compression mechanism forms fixed spiral blades on a fixed head plate. Fixed swirl vane member, and a swirl swirl vane member formed on a swivel end plate with swirl swirl blades meshing with the fixed swirl blades to form a plurality of compression working spaces, and a peripheral flat surface of the fixed end plate. A peripheral flat surface of the turning head plate is slidably abutted, and an axial movement limiting plate is provided on the back surface of the turning head plate through a minute gap, and a discharge side of the compression mechanism is provided at a center side of the back surface of the turning head plate. Pressure is applied, and a sliding partition ring that slidably seals and separates the gap so that a pressure smaller than the discharge pressure is applied to the outside thereof is disposed, and lubricating oil in the sliding partition ring inner space is provided. scan the discharge pressure is to act A roll compactor, the handed
Inside the turning head, one opening is formed by the turning head and the fixed head.
Open on the sliding part on the peripheral flat surface, and the other opening
Oil that intermittently opens into the inner space of the sliding partition ring by the ring
A scroll compressor having a passage . 2. An electric motor and a compression mechanism which is driven by the electric motor and in which a discharge side pressure acts on the electric motor, are arranged inside the closed container, and the compression mechanism forms a fixed spiral blade on a fixed head plate. Fixed swirl vane member, and a swirl swirl vane member formed on a swivel end plate with swirl swirl blades meshing with the fixed swirl blades to form a plurality of compression working spaces, and a peripheral flat surface of the fixed end plate. A peripheral flat surface of the turning head plate is slidably abutted, and an axial limiting plate is provided on the back surface of the turning head plate via a minute gap, and a discharge side pressure of a compression mechanism is provided at a center side of the back surface of the turning head plate. Is acted on, and a sliding partition ring is arranged outside the gap so as to slidably seal and partition the gap so that a pressure smaller than the discharge pressure acts thereon,
A scroll compressor in which a discharge-side pressure acts on lubricating oil in a space inside the sliding partition ring , wherein the orbiting head plate
Inside, one opening is around the revolving head plate and fixed head plate
Open to the flat sliding part and the other opening to the sliding partition ring
Therefore , a horizontal scroll is characterized in that an oil passage intermittently opening into the inner space of the sliding partition ring is provided, and a setting direction of the oil passage is set to be within 45 ° with respect to a vertical upward direction.
Compressor. 3. A circle communicating with an opening of a peripheral flat sliding portion of an oil passage.
3. The scroll compressor according to claim 1, wherein an arc-shaped oil holding groove is provided .