JP2746665B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll-type electric compressor.

2. Description of the Related Art As a conventional example of a scroll electric compressor of the present invention,
Reference is made to JP-A-57-18491.

FIG. 5 shows a conventional example cited in this publication, and FIG.
FIG. 1 is a sectional view of a scroll compressor according to the invention disclosed in the publication.

A compression mechanism 102 and a stator 103 of an electric motor are fixed above the compression mechanism 102 inside the closed container 101, and a lubricating oil reservoir 104 for storing lubricating oil is provided below.

The compression mechanism 102 includes a fixed spiral blade part 107 having a fixed spiral blade 106 integrally formed on a fixed frame 105, and a swirling spiral blade that meshes with the fixed spiral blade 106 to form a plurality of compression work spaces 111. A swirling spiral blade part 110 formed on a swivel end plate 109, a rotation restricting part that prevents the swirling spiral blade part 110 from rotating and only turns, and a swivel drive bearing 113 provided on the swivel end plate 109. It comprises a crankshaft 115 having an eccentric drive shaft 114 for eccentric turning drive, a bearing part 119 having a relatively long main bearing 117 for supporting a main shaft 116 of the crankshaft below a rotor 112 of the electric motor, and the like. ing.

The refrigerant gas sucked into the compression mechanism 102 from the suction pipe 124 of the compressor is compressed in the compression working space 111, then exits the discharge hole 125, and accompanies a part of the lubricating oil in the lubricating oil reservoir 104, and the compression mechanism 102
Through the communication hole 126 around the motor stator 103, and further through the communication hole 127 around the motor stator 103, from the discharge pipe 128 to the outside of the compressor.

6, the refrigerant gas compressed in the compression working space 111 is discharged from the discharge hole 125A provided in the swivel end plate 109 through the main shaft 116 of the crankshaft. After passing through a radial passage 127B provided on a rotating disk 127A through a communication hole 126A provided therein, and separating the lubricating oil contained in the refrigerant gas by the action of the rotation of the rotating disk, the discharge pipe 128 Is said to be discharged from

Problems to be Solved by the Invention The compressors shown in FIGS. 5 and 6 described above each have a structure in which the shaft is supported on one side of the electric motor. If the motor is made to rotate at high speed or is made longer in the axial direction of the motor to reduce its size and weight, an excessive load may be applied to the main bearing, or the crankshaft may bend or the rotor may whirle. This tends to cause vibration of the compressor, reduction of the efficiency of the electric motor and breakage of the bearing. Furthermore, in practice, a counterweight for statically and dynamically balancing the inertia force of the swirling spiral blade part 110 and the like is attached to the electric motor, and the shaft diameter of the crankshaft is designed to be as small as possible. However, there is a problem that these tendencies are further promoted.

In order to solve the above-mentioned problems, it is easy to arrange a slide bearing above the electric motor, but it is necessary to supply a large amount of lubricating oil necessary for lubrication of the slide bearing, and to provide an upper surface of a stator of the electric motor. Or fixing the sliding bearing so that the axis coincides with the required accuracy with reference to the inner surface of the closed vessel;
It is extremely difficult to inexpensively construct such that lubricating the sliding bearing and returning a large amount of the lubricating oil flowing out of the motor to the lubricating oil reservoir below the motor without discharging a large amount of the lubricating oil out of the compressor.

The structure shown in FIG. 5 has a disadvantage that a large amount of lubricating oil is sent out of the compressor.

In the compressor having the structure shown in FIG. 6, the compressed refrigerant gas that has exited the compression working chamber is discharged directly above the motor through the axis of the crankshaft. There is a drawback that heat is hardly removed, and the temperatures of the compressor and the electric motor increase, resulting in a decrease in the efficiency of the compressor, deterioration of the insulator of the electric motor, and deterioration of the lubricating oil.

Means for Solving the Problems A first technical means for solving the problems in the present invention is to dispose an electric motor above the inside of a closed container and a compression mechanism below the inside of the closed container. A fixed swirl vane part having a fixed swirl vane formed thereon, a swirl swirl vane part formed on a swivel head plate and having a swirl swirl vane meshing with the fixed swirl vane to form a compression working space, and rotation of the swirl vane part Rotation restraining parts that prevent
A crankshaft for swiveling the swirling vane component, and a bearing component having a main bearing for supporting a main shaft of the crankshaft formed below the crankshaft in one place,
A turning drive shaft or a turning drive bearing is formed on the side of the turning end plate opposite to the turning spiral blade, and the turning drive shaft or the turning bearing is fitted to an eccentric bearing or an eccentric shaft provided near the main shaft of the crankshaft. Fixing the crankshaft to the rotor of the electric motor, supporting the upper end of the crankshaft opposite to the main shaft with a rolling bearing, and holding the sealed container around the rolling bearing. A partition partitioning a space on the motor side and a discharge chamber above the motor is provided, a lubricating oil reservoir is provided above the compression mechanism, a crankshaft enclosure surrounding the crankshaft is provided, and the compressed refrigerant gas compressed by the compression mechanism is supplied to the motor. Discharged downward into the crankshaft enclosure, guided above the rotor through the periphery of the rotor, and guided to the discharge chamber through a passage gap or passage hole formed in the partition. It is.

A second technical means relates to an improvement of the first technical means, and provides the passage gap or the passage hole near the rolling bearing.

The third technical means may further include, in addition to the second technical means, a discharge gas guide which surrounds a space between an upper end of a rotor of the electric motor and the rolling bearing and the passage gap or the passage hole therearound. A cylinder is provided, and a liquid separation gap is provided between the upper end of the rotor and the lower end of the discharge gas guide cylinder.

A fourth technical means is that, in addition to the first technical means, the partition wall is formed in a dish shape, the center is lowered, and the lubricating oil separated in the discharge chamber is directed to the rolling bearing. Is to flow down.

A fifth technical means is that, in addition to the first technical means, a rolling bearing is fixed to the partition wall, the outer periphery of the partition wall is made cylindrical, and the outer periphery of the partition is fitted tightly to the inner wall of the sealed container. An annular projection is formed on the outside of the outer periphery, the lower and upper sides of the closed container are joined with the annular portion, and these three parts are integrally welded and sealed.

Operation The operation of the first technical means of the present invention described above is as follows. Since the crankshaft can be supported by one short bearing at each of the upper and lower ends of the motor stator, the crankshaft is rotated at high speed. In addition, even if the main shaft of the crankshaft is reduced in diameter or the motor becomes longer in the axial direction, the occurrence of bending and runout of the crankshaft and whirling of the rotor are suppressed.

The main flow of the discharged refrigerant gas passes around the stator of the motor to remove heat generated by the stator, thereby preventing deterioration of the motor and the lubricating oil.

By using a rolling bearing for the upper end bearing, the required lubricating oil supply is very small. In addition, using a rolling bearing for the upper end bearing increases the tolerance for a tilt error between the shaft center and the crankshaft. Furthermore, if the crankshaft is supported on both the upper and lower sides of the motor, the lower end bearing may be short, so that the tolerance for the inclination error between the shaft center of the lower end bearing and the crankshaft is increased as in the case of the upper end.

Furthermore, the partition wall prevents the lubricating oil in the compressed refrigerant gas from flowing into the discharge chamber above the partition wall to some extent, and a passage gap or a passage hole having a small cross-sectional area of the main flow of the compressed refrigerant gas provided near the rolling bearing, It accelerates the refrigerant gas passing therethrough and acts to partially separate the lubricating oil contained in the refrigerant gas during diffusion and deceleration in the discharge chamber.

Also, by providing a crankshaft enclosure surrounding the crankshaft and discharging the compressed refrigerant gas compressed by the compression mechanism into the crankshaft enclosure below the electric motor, the rotation of the crankshaft and the discharge of the compressed refrigerant gas cause the lubricating oil reservoir to be discharged. Since the agitation of the lubricating oil is suppressed, the lubricating oil is not excessively diffused in the closed container and flows out of the closed container, so that shortage of the lubricating oil in the closed container can be prevented.

The effect of the second technical means is to supply the lubricating oil droplets in the compressed refrigerant gas to the upper rolling bearing in addition to the operation of the first technical means.

The function of the third technical means is that, in addition to the function of the second technical means, a centrifugal force is applied to the lubricating oil droplets in the compressed refrigerant gas at the liquid separation gap formed opposite to the upper end of the rotor. To prevent excessive intrusion into the discharge gas guide cylinder.

The function of the fourth technical means is, in addition to the function of the first technical means, to collect a small amount of lubricating oil separated in the discharge chamber, flow down to the rolling bearing, and supply it.

The operation of the fifth technical means is, in addition to the operation of the above-mentioned first technical means, used as a rolling bearing and a partition wall, and abutting against the upper and lower ends of the closed container by annular projections on the outer periphery of the partition wall. This makes it possible to keep the inclination of the axis of the rolling bearing small.

Embodiment FIG. 1 is a longitudinal sectional view of a scroll-type electric compressor, which is an embodiment according to claims 1, 4 and 5 of the present invention.

A compression mechanism 2 and a stator 3 of an electric motor for driving the compression mechanism 2 are fixed inside the closed container 1, and a lubricating oil reservoir 4 is provided below the electric motor.

The compression mechanism 2 includes a fixed spiral blade component 7 having a fixed spiral blade 6 formed integrally with the fixed frame 5, and a swirling spiral blade 8 that meshes with the fixed spiral blade 6 to form a plurality of compression work spaces 11. A swirling spiral blade part 10 formed on the swiveling end plate 9, a rotation restraining part 12 for preventing the swirling spiral blade part 10 from rotating and only rotating, and an eccentric drive shaft 13 provided on the swivel end plate 9 It comprises a crankshaft 15 having an eccentric drive bearing 14 for turning and a bearing part 19 having a main bearing 17 for supporting a main shaft 16 of the crankshaft below a rotor 12A of the electric motor.

The upper end of the crankshaft 15 is fitted into a ball bearing 21 fixed to a partition 20 formed in a dish shape with its center downward, and the partition 20 defines a space above the stator 3 and the rotor 12A of the motor as a space 22 on the motor side. It is partitioned into a discharge chamber 23, and a passage hole 24 having a small cross-sectional area communicating between these two spaces is provided. Further, an annular partition wall 25 is formed on the outer periphery of the cylindrical surface of the partition wall 20 inscribed in the closed container 1, and is sandwiched between the lower end of the closed container upper portion 26 of the closed container 1 and the upper end of the closed container body 27 of the closed container 1. , These three parts are hermetically welded together.

Similarly, a bearing component annular projection 18 provided on the outer periphery of the bearing component 19 is provided.
Is sandwiched between the lower end of the closed container body 27 and the upper end of the closed container lower portion 28, and these three parts are integrally welded and sealed.

From the suction pipe 29 of the compressor to the suction chamber inside the lower part of the closed container 28
Refrigerant gas entering the compression mechanism 2 through the suction port 31 is compressed in the compression working space 11, and then passes through the rotation drive shaft 13 through the discharge hole 32 provided in the revolving head plate 9, and is cranked. It passes through a communication hole 33 provided in the shaft 15 and blows out to the bottom of the crankshaft enclosure 34, and a gap 35 above the crankshaft enclosure 34
Through the communication passage 36 provided around the stator 3 of the motor, guided to the motor-side space 22 above the stator 3, accelerated through the passage hole 24, and accelerated and diffused and decelerated in the discharge chamber 23. . At this time, a part of the lubricating oil droplets contained in the discharged refrigerant gas separates and flows down toward the ball bearing 21 at the bottom of the dish-shaped center of the partition 20 to lubricate it. This refrigerant gas is discharged from the discharge pipe 37 to the outside of the compressor.

FIG. 2 shows the partition wall 20 of the invention according to claim 2.
The example of the part A is shown.

A passage hole 24A is provided around the partition wall 20A and the ball bearing 21.

FIG. 3 shows the first aspect of the invention according to claim 3.
2 and FIG. 2, a liquid separation gap 40 is provided between the upper end of the rotor 12A and the counterweight 39 fixed thereto, with the lower end of the discharge gas guide cylinder 38 surrounding the passage hole 24A and the ball bearing 21. Be provided.

FIG. 4 is an embodiment of the invention according to claim 4 and is a detailed view of the sealing welding portion of FIG.

Advantageous Effects of the Invention According to the technical means of the first aspect of the present invention, as described in the operation section, while suppressing excessive lubricating oil discharge without impeding cooling of the electric motor, the upper bearing In order to be able to supply the required amount of lubricating oil, it is possible to support the crankshaft at the upper and lower ends of the rotor of the electric motor. Damage to the main bearing, excessive wear of the shaft and bearings due to lack of lubricating oil, etc. are unlikely to occur, and a highly reliable, quiet and efficient compressor can be realized.

The effect of the technical means of the second aspect is, in addition to the effect of the first aspect, an oil droplet in the discharged refrigerant gas collides with a rolling bearing at the upper end to further ensure lubrication and improve the reliability of the compressor. Further improve.

A design that allows a certain amount of lubricating oil droplets to be contained in the discharged gas below the electric motor can be achieved.

The effect of the third technical means is, in addition to the effect of the means of the above-mentioned second term, a great effect of preventing excessive outflow of the lubricating oil in the compressed refrigerant gas. That is, the degree of freedom in design is large.

The effect of the fourth technical means is that, in addition to the effect of the above-described item 1, the lubricating oil collected in the discharge chamber is caused to flow down in the dish-shaped portion and is reliably supplied to the upper end bearing, so that it is even higher. Reliability can be obtained.

According to the effect of the fifth technical means, in addition to the effect of the above-described item 1, the accuracy of the component mounting relation is high.

[Brief description of the drawings]

FIGS. 1, 2, 3 and 4 are sectional views and a sectional view of a main part of a scroll compressor showing different embodiments of the present invention, and FIGS. 5 and 6 show compression examples showing a conventional example. It is sectional drawing of a machine. DESCRIPTION OF SYMBOLS 1 ... Closed container, 2 ... Compression mechanism, 3 ... Motor stator, 4 ... Lubricating oil reservoir, 5 ... Fixed head plate, 6 ... Fixed spiral blade, 7 ... Fixed spiral blade part, 8 ... Swirling swirl vanes,
9: rotating head plate, 10: rotating spiral blade parts, 11: compression working space, 12: rotation restraining parts, 12A: rotor of electric motor, 13: rotating drive shaft, 15: crank shaft, 16 …… Main shaft, 19 …… Bearing parts, 20 …… Bulkhead, 21 …… Ball bearing, 22…
… Motor side space, 23… discharge chamber, 24… passage hole, 25…
Annular projection of partition wall 26 Upper part of closed container 27 Body part of closed container 28 Lower part of closed container 29 Suction pipe 31 Suction port 32 Discharge hole 36 Communication passage 37 …… Discharge pipe, 38…
... Discharge gas guide cylinder.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Karado 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-57-35184 (JP, A) JP-A-62- 253982 (JP, A) JP-A-62-214290 (JP, A) JP-A 64-4891 (JP, U) JP-A-59-148487 (JP, U)

Claims (5)

(57) [Claims] An electric motor and a compression mechanism driven by the electric motor are disposed below the electric motor inside the closed vessel, and the compression mechanism is a fixed spiral blade part having a fixed spiral blade formed on a fixed frame body. And a swirling spiral blade part which meshes with the fixed swirling blade to form a plurality of compression working spaces on a swiveling end plate, or a swirling spiral blade part, and prevents only swirling of the swirling spiral blade part to prevent rotation. And a bearing component having a main bearing that supports a main shaft formed below the crankshaft at one place. A swivel drive shaft or a swivel drive bearing is formed on the side opposite to the swirl spiral blade, and the swivel drive shaft or the swivel bearing is fitted to an eccentric bearing or an eccentric shaft provided near the main shaft of the crankshaft. A crankshaft is fixed to a rotor of the electric motor, and an upper end of the crankshaft opposite to the main shaft is supported by a rolling bearing, and the hermetic container is placed around the rolling bearing around the motor. A partition partitioning the space and the discharge chamber above the motor is provided, a lubricating oil reservoir is provided above the compression mechanism, a crankshaft enclosure surrounding the crankshaft is provided, and compressed refrigerant gas compressed by the compression mechanism is provided below the motor. A scroll compressor that discharges into the crankshaft enclosure, guides the rotor through the periphery of the rotor and above the rotor, and guides the discharge chamber through the passage gap or passage hole formed in the partition. 2. The scroll compressor according to claim 1, wherein said passage gap or passage hole is provided near said rolling bearing. 3. A discharge gas guide cylinder surrounding an upper end of a rotor of the electric motor and the passage gap or the passage hole and the rolling bearing is provided, between an upper end of the rotor and a lower end of the discharge gas guide cylinder. 3. The scroll compressor according to claim 2, further comprising a liquid separation gap in which both ends are opposed to each other. 4. The partition wall is shaped like a dish, the center is lowered,
2. The scroll compressor according to claim 1, wherein the lubricating oil separated in the discharge chamber flows down toward the rolling bearing. 5. The rolling bearing is fixed to the partition, the outer periphery of the partition is made cylindrical, and fitted tightly to the inner wall of the sealed container, and an annular projection is formed outside the cylindrical outer periphery. 2. The scroll compressor according to claim 1, wherein the lower part and the upper part of the closed container are abutted on the annular portion, and these three parts are integrally welded and sealed.