JP2615971B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll compressor used for an air compressor, a refrigerant compressor, and the like.

[Conventional technology]

FIG. 5 is a longitudinal sectional view of a conventional scroll compressor disclosed in JP-A-63-117191. In the figure, reference numeral 1 denotes a fixed scroll in which a spiral projection 1b is provided on the lower surface of a base plate portion 1a, and a discharge port 4 is opened at the center. Reference numeral 2 denotes an orbiting scroll provided with a spiral projection 2b on the upper surface of the base plate portion 2a and combined with the spiral projection 1b.
Is provided. 3 is a suction port formed on the outer peripheral side between both scrolls 1 and 2, 5 is a compressor formed by both spiral projections 1b and 2b, 6 is a main shaft, and an eccentric hole is formed in a large diameter portion 6a at the upper end. 6b is provided to swing the swing scroll 2 via the swing bearing 18. The main shaft 6 is provided with an eccentric oil supply hole 6c and a balancer 6d. 7 is the main shaft 6
A suction port 7a is provided with an oil cap fixed to the lower end of the oil pump, and a centrifugal pump means is constituted by the oil supply hole 6c.

8 is an upper bracket for fixing the fixed scroll 1;
The orbiting scroll 2 is supported from below via an upper thrust bearing 19, and the large diameter portion 6a of the main shaft 6 is supported via an upper bearing 20.
Are supported in the radial direction. The upper bracket 8 is provided with a plurality of oil return holes 8a and a plurality of outer gas passages 8b. Reference numeral 9 denotes a lower bracket fixed to the lower container 12a, which fixedly supports the upper bracket 8, and supports the main shaft 6 from below and in a radial direction via a lower thrust bearing 21 and a lower bearing 22. The lower bracket 9 is provided with a balancer chamber 9a at an upper portion, an oil drain hole 9b and a plurality of gas passages 9c at an outer portion, and a plurality of gas passages 9d at a lower portion.

Next, reference numeral 10 denotes a rotor of the electric motor fixed to the main shaft 6 and rotated, and 11 denotes a stator of the electric motor attached to the lower portion of the lower bracket 9 by bolts (not shown).
11a and a stator winding 11b. Reference numeral 12 denotes a closed container in which the upper container 12b is hermetically connected to the lower container 12a by welding, etc.
An Oldham's joint is interposed between the upper bracket 8 and the orbiting scroll 2 to prevent the orbiting scroll 2 from rotating and to guide the revolving motion. The oil sump stores lubricating oil 25.
Reference numeral 16 denotes a suction pipe hermetically fixed to the lower container 12a, and a tip thereof is fitted into a suction hole of the lower bracket 9, and 17 is a discharge pipe fixed to the fixed scroll 1 and fixed to the upper container 12b.

32 has a U-shaped cross section, the outer periphery of the stator 11 and the lower container.
12a The oil drain guide mounted between the inner circumference and the oil drain hole 9b
Is formed with an oil drain passage 32a communicating with the oil discharge passage 32a.

FIG. 6 is a bottom view showing a conventional scroll compressor in which a lower container is sectioned. The oil drain from the oil drain hole 9b is guided downward by the oil drain passage 32a of the oil drain guide 32, and returned to the oil sump 15.

Next, the operation of the conventional scroll compressor will be described. When the rotor 10 and the main shaft 6 of the electric motor rotate, the orbiting scroll 2 revolves while being prevented from rotating by the Oldham coupling 13. As a result, the compression chamber 5 between the two moves toward the center side, the volume gradually decreases and the gas pressure increases, and the pressure is sent from the discharge port 4 by the discharge pipe 17.

In this case, the suction gas is sucked from the suction pipe 16, and a part of the gas flows through the gas passage 9 d of the lower bracket 9 as shown by the solid arrow.
The other part passes through an air gap between the rotor 10 and the stator 11, cools the motor, is taken into the compression chamber 5 from the suction port 3 through the gas passages 9c and 8b, and is compressed.

Further, the lubricating oil 25 of the oil sump 15 rises in the eccentric oil supply hole 6c by the rotation of the main shaft 6 as shown by the dotted arrow, and the bearings 22, 21, 1
Lubricate 8, 20 and 19. The lubricating oil 25 that has lubricated the bearing passes through the oil return hole 8a, the balancer chamber 9a, and the oil discharge hole 9b, descends through the oil discharge passage 32a, and returns to the oil sump 15.

In the above-described conventional scroll compressor, the position of the suction pipe 16 is above the electric motor, and the suction port 3 of the compression section is located at the upper part in the compressor. For this reason, most of the suction gas from the suction pipe 16 is sucked through the gas passages 9d, 9c, and 8b on the shortest distance side due to the negative pressure suction of the suction port 3. Therefore, the flow rate of the suction gas flowing downward from the back of the stator 11 becomes insufficient.

[Problems to be solved by the invention]

The conventional scroll compressor as described above has a problem that the amount of suction gas flowing under the electric motor is insufficient and the temperature rise is large. Further, the flow area of the gap between the stator 11 and the lower vessel 12a is significantly larger than the flow area of the gas passage 9d, so that the flow rate of the suction gas in the gap is extremely slow, and the flow rate of the stator winding 11b is reduced. There is a problem that the gas cannot sufficiently flow to the lower side and the temperature rise of the stator winding becomes unbalanced.

Further, the suction port 3 of the compression section is suctioned with a negative pressure, so that the suction pipe
Since the suction gas flows intensively in the gas passage 9c near the side 16, the flow velocity becomes extremely high, and especially when the inverter is driven at a high speed, the flow velocity becomes much higher. The high-speed rotation of the balancer section 6d of the main shaft 6 causes the oil discharged into the balancer chamber 9a to become oil mist, and the oil mist descending from the oil discharge hole 9b becomes
There is a problem in that the lubricating oil mixes with the suction gas having a high flow velocity passing through the gas passage 9c, is discharged into the compression chamber 5 and rises, and the amount of the lubricating oil 25 is reduced.

The present invention has been made to solve such problems, and provides a scroll compressor that sufficiently cools an electric motor, makes the temperature rise of a stator winding uniform, and suppresses a reduction in lubricating oil. It is intended to be.

[Means for solving the problem]

In the scroll compressor according to the present invention, the suction gas sucked from the suction pipe is introduced into the introduction chamber formed on the side of the lower bracket in contact with the inner peripheral surface of the lower container, and provided at the upper and lower parts of the introduction chamber. And a guide passage means for guiding the suction gas from the lower branch hole to the lower side of the stator of the electric motor.

[Action]

In the present invention, the cross-sectional area of the branch hole provided in the upper part and the lower part of the lower part of the introduction chamber is set so as to be the branch amount ratio of the intake gas branched, and the intake gas sucked from the suction pipe is set in the introduction chamber in the above-described manner. Diverges upward and downward at the specified rate, reduces the flow velocity of the gas passing through the upper gas passage, suppresses the trapping of the drain oil descending from the drain hole of the lower bracket, and prevents the loss of lubricating oil . Further, the suction gas directed downward from the introduction chamber is guided below the motor stator by the guide channel means, and cools the motor uniformly.

〔Example〕

FIG. 1 is a longitudinal sectional view of one embodiment of a scroll compressor according to the present invention, and includes 1 to 8, 10, 12 to 22, 25, 1a, 1b, 2a to 2c,
6a to 6d, 8a, 8b, 12a, and 12b are the same as those of the above-described conventional device, and a description thereof will be omitted. Reference numeral 39 denotes a lower bracket, in which a balancer chamber 39a is provided in an upper part, and an oil drain hole 39b provided in a side part communicates with the balancer chamber 39a. Further, an enclosing portion 39d is provided on a side portion, and the outer end surface is in close contact with the inner peripheral surface of the lower container 12a, and an introduction chamber 40 is formed therein and communicates with the suction pipe 16. The enclosure 39d is provided with an upper branch hole 39e and a lower branch hole 39f.
The upper and lower gas distribution amounts are adjusted by the cross-sectional area ratio between the two branch holes 39e and 39f, and the downward intake gas amount is the amount required for cooling the electric motor.

Reference numeral 41 denotes a motor stator, which includes a stator core 41a and a stator winding 4
1b. A guide hole 41d is provided in the stator core 41a in the axial direction and communicates with the lower branch hole 39f.
A part of the suction gas that has entered 0 is guided below the electric motor. Reference numeral 42 denotes a guide attached to the lower end of the stator core 41a.
It communicates with 1d and guides the suction gas to the motor in the circumferential direction. The guide hole 41d and the guide body 42 constitute a guide passage means for guiding a part of the suction gas of the introduction chamber 40 to below the electric motor.

The stator 41 is shown in a bottom view in FIG. The stator core 41a is provided with a bolt hole 41c and a guide hole 41d.

The lower bracket 39 is shown in a bottom view in FIG. A plurality of gas passages 39c and oil drain holes 39b are provided on the side of the lower bracket 39. Further, three ribs 39g for receiving and mounting the upper end face of the stator core 41a and one rib-enclosing portion 39d are provided on the side portions, and screw holes 39h for bolts are provided respectively. .

FIG. 4 is an exploded perspective view of the lower bracket 39 and the stator 41. Mounting bolts in each bolt hole 41c of stator core 41a
Pass through 24 and attach to the lower bracket 39. At this time, the guide body 42 is fitted to the mounting bolt 24 at the guide hole 41d and fastened together. When the stator 41 is attached to the lower bracket 39 in this manner, the guide hole 41d communicates with the lower branch hole 39f of the introduction chamber 40, and the suction gas branched downward is guided by the guide body 42 by turning around in the circumferential direction. I will

In the scroll compressor of the embodiment, the rotor 10
When the main shaft 6 rotates, the suction gas from the suction pipe 16 enters the introduction chamber 40 and flows upward and downward through the upper and lower branch holes 39e and 39f. Downward, the gas flow required for cooling is set, and the gas passes through the guide holes 41d and guides 42, is guided downward in the motor and is drawn in the circumferential direction, cools the stator winding 41b, and passes through the back and upper portions of the stator. The gas passes through the gas passages 39c and 8b in a distributed manner, and is sucked into the suction port 3 of the compression unit.

In this way, a part of the suction gas flows upward, is separated from the drain oil and enters the suction port 3, and the other part flows downward to cool the electric motor substantially uniformly. The amount of gas diverted downward is smaller than that of the conventional gas passing through the gas passage 9d, and is distributed to the gas passages 39c and 8b. Is suppressed.

〔The invention's effect〕

As described above, according to the present invention, an enclosure is provided on the outer side of the lower bracket and is closely attached to the inner peripheral surface of the closed container to form an introduction chamber, and an upper branch hole and a lower branch hole are provided in the introduction chamber. Since the suction gas from the suction pipe is introduced into the introduction chamber, the amount of the suction gas flowing upward and downward is adjusted to an appropriate ratio, and the suction gas from the lower branch hole is guided to the lower part of the motor by the guide flow path means. The stator windings of the motor are cooled substantially uniformly. In addition, it is possible to reduce the drainage oil flowing down the drainage hole of the lower bracket from being caught in the suction gas, thereby suppressing the reduction of the lubricating oil.

[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 bottom view of a lower bracket of FIG. 1,
3 is a bottom view of the stator of FIG. 1, FIG. 4 is an exploded perspective view of the lower bracket and the stator of FIG. 1, FIG. 5 is a longitudinal sectional view of a conventional scroll compressor, and FIG. The lower container showing the compressor of FIG. 5 is a cross-sectional bottom view. 1 ... fixed scroll, 2 ... swinging scroll, 5 ...
Compressor, 6 Main shaft, 6a Large diameter section, 6c Eccentric oil supply hole, 8 Upper bracket, 10 Motor rotor, 16
… Suction pipe, 17… Discharge pipe, 18… Swing bearing, 19 …… Upper thrust bearing, 20 …… Upper bearing, 21 …… Lower thrust bearing, 22 …… Lower bearing, 39 …… Lower bracket, 39d…
... Enclosure, 39e ... Upper branch hole, 39f ... Lower branch hole, 40
... Introduction room, 41 ... Motor stator, 41a ... Stator iron core, 41d ... Guide hole, 42 ... Guiding body. In the drawings, the same reference numerals indicate the same or corresponding parts.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-239394 (JP, A) JP-A-61-265380 (JP, A) JP-A-63-36072 (JP, A) JP-A-62 126285 (JP, A) JP 2-157488 (JP, B2) JP 2-45676 (JP, B2)

Claims (1)

(57) [Claims] 1. A fixed scroll, an oscillating scroll combined with the fixed scroll, oscillating, compressing and discharging a fluid in a compression chamber formed therebetween, and a main shaft for oscillating the oscillating scroll. An upper bracket that fixes the fixed scroll to the upper portion, supports the orbiting scroll from below, and supports the upper end of the main shaft in a radial direction, and fixes the upper bracket to the upper portion to form a main shaft. The lower bracket supports the upper end of the lower shaft from below, and radially supports the middle part of the main shaft, the stator of the electric motor fixed to the lower end of the lower bracket, and the electric motor fixed to the lower side of the main shaft. A rotor and an outer portion of the lower bracket are fitted into and fixed to an inner peripheral portion of the lower bracket, and a hermetically sealed container accommodating the above-mentioned components is provided. In a scroll compressor having a suction pipe leading to a socket part, and a discharge pipe fixed to the upper part of the fixed scroll and discharged from the upper part of the sealed container and delivering compressed fluid, a side part of the lower bracket and An introduction chamber formed between the inner peripheral surface of the closed container and provided with an upper branch hole and a lower branch hole for guiding suction fluid from the suction pipe and branching the suction fluid upward and downward; A scroll compressor, comprising: a guide passage means that communicates with a hole and guides a suction fluid below a stator of an electric motor.