JP2001140779A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor to reduce the occurrence of flow-off of oil, perform cooling of an electric motor, and be high in reliability. SOLUTION: A gas flow restricting means to allow flow-down of separated oil from a middle space to a lower space but block spouting up of gaseous fluid from the lower space to the middle space is situated in the outer peripheral passage of a stator not positioned facing the outer peripheral passage of a frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor suitable for a refrigerant compressor for refrigeration and air conditioning, and a compressor for air or other gas, and more particularly to an improvement for reducing oil rising and cooling an electric motor. The present invention relates to a scroll compressor.

[0002]

2. Description of the Related Art There are various measures for reducing oil rise in a scroll compressor. For example, Japanese Patent Laid-Open Publication No. Hei 5-44667 discloses two embodiments as improvements.

The first embodiment disclosed in the above publication is as follows. In this embodiment, the gas fluid and the oil discharged into the upper space in the closed container enter the middle space through the frame outer peripheral passage. Some gas fluids collide with the upper end of the motor and separate from oil to cool the upper coil of the motor,
Discharged from the discharge pipe. Also, other gas fluids and oils
Further, the fuel is blown from the injection device toward the lower coil end of the electric motor through the stator outer peripheral passage leading from the middle space to the lower space, and collides. At this time, oil and gas fluid are separated, and the oil adheres to the coil end and gently drops into the oil sump.The gas fluid flows around the coil end to cool the lower coil of the motor, The air enters the middle space through the gap between the shaft and the stator, and is discharged from the discharge pipe.

A second embodiment is as follows. This is a structure in which fins are provided in addition to the first embodiment in the guide passage connecting the outer peripheral passage of the frame and the outer peripheral passage of the stator and the upper part of the rotor of the electric motor. In the example,
All of the gas fluid and oil discharged into the upper space pass through the frame outer peripheral passage, the guide passage, and the stator outer peripheral passage, and are blown out from the injection device toward the coil end of the electric motor to collide. The oil separates from the gaseous fluid and drops into the sump. After cooling the lower coil of the motor, the gas fluid enters the middle space through the gap between the rotor and the stator of the motor, is stirred by the fins provided above the rotor, cools the upper coil of the motor, and discharge pipes. It is discharged from.

Further, as another improvement, Japanese Patent Application No. 10-341222, which is a prior application, discloses an upper space having a discharge chamber for gas fluid outside a frame of a compressor section and a middle space having a discharge pipe. A stator outer peripheral passage communicating the middle space and a lower space having an oil sump at the bottom is provided outside the stator of the electric motor portion, and the inner wall surface of the sealed container and the outer peripheral surface of the coil end are provided. A gas guide passage frame having a U-shaped cross section that connects the two passages to each other is mounted and arranged in an annular space formed between the closed space inner wall and the closed container inner wall at a position lower than the upper end surface of the coil end on the side surface of the gas guide passage frame. A circumferential outlet is opened, at least one collision plate is provided facing the outlet, and a rectifying plate is provided at an upper end of the collision plate to prevent a gas fluid from flowing into the middle space. Passage to the passage Countercurrent outlet section, examples of forming squeezing channel cross-section is shown.

[0006]

However, in the first embodiment disclosed in the above-mentioned publication, the gas fluid that reaches the discharge pipe directly through the upper portion of the motor without reaching the lower portion of the motor is sufficient oil. Since it did not pass through the separating means, it contained a large amount of oil, and the effect of reducing oil rise was small. Also, even if a part of the oil contained in the gas fluid passing through the upper part of the motor falls on the motor, if it falls on the rotor, it re-scatters due to the rotation of the rotor and falls on the stator. In such a case, the oil was re-scattered by the upward flow of the gas fluid returning from the lower portion of the electric motor, and the oil was discharged out of the compressor through the discharge pipe.

On the other hand, if the flow rate of the gas fluid flowing to the lower part of the motor is reduced, oil re-splashing due to the upward flow can be prevented. There was a possibility that the coil temperature would increase, the efficiency would decrease, and the motor would burn out.

Also, in the second embodiment, the gas velocity returning to the upper portion of the motor is increased particularly in a model having a large gas flow rate, and the oil drops separated by the coil collision are blown up and re-scattered, so that the oil rising is reduced. The effect was small.

Further, Japanese Patent Application No. Hei 10-3412 related to the prior application
In the oil separation structure described in No. 22, most of the gas fluid discharged from the compressor section is rotated along the inner wall of the closed vessel at the upper part of the motor, and the separated oil is passed through the outer peripheral passage of the stator of the motor. The structure was such that the gas was dropped into a pool, and almost no gas fluid flowed under the motor. For this reason, the temperature of the lower coil of the motor increases during high-load operation of the compressor, and there is a possibility that the efficiency may decrease or the motor may burn out.
As a means to solve this problem in the conventional structure, it was possible to adjust the distribution of the gas guide passage frame to increase the gas flow rate to the lower part of the motor and to promote the cooling of the lower part of the motor. When the gas flow rate is increased, a strong upward flow is generated in a part of the stator outer peripheral passage of the electric motor, and the oil separated at the upper part of the electric motor is prevented from dropping into the oil sump, thereby increasing the oil rise. A problem occurred, and it was difficult to achieve both motor cooling and oil rise reduction.

[0010] In view of the above problems, an object of the present invention is to provide a highly reliable scroll compressor capable of reducing oil rising and cooling an electric motor.

[0011]

In order to achieve the above object, a scroll compressor according to the present invention is characterized by what is described in each of the claims. The scroll compressor according to the first aspect of the present invention is an electric motor including a compressor unit in which a fixed scroll, an orbiting scroll, and a frame are combined with each other, a stator having a coil end, and a rotor inside a closed container. And a space inside the closed casing where the compressed gas fluid is discharged and a middle space inside the closed casing above the electric motor to which the discharge pipe for the gas fluid is attached is provided outside the frame of the compressor section. One frame outer peripheral passage, also, on the outside of the stator of the electric motor unit, communicates the inner space inside the hermetic container and the lower space inside the hermetic container below the electric motor having an oil reservoir at the bottom, In the scroll compressor, a plurality of stator outer peripheral passages facing the frame outer peripheral passage are provided, the book being formed between an inner wall surface of the hermetic container and an outer peripheral surface of the motor unit upper coil end. A gas guide passage frame having a U-shaped cross section that connects the frame outer peripheral passage and one of the stator outer peripheral passages to each other is mounted and disposed in the annular space portion, and the gas guide passage frame has a U-shaped cross section. Opening the peripheral container inner peripheral wall circumferential outlet at a position lower than the upper end surface of the coil end on the side surface, providing at least one collision plate facing the outlet portion, and providing an upper end on the upper end of the collision plate. A flow straightening plate for preventing the flow of gas fluid toward the outside is provided, and the flow of the separated oil from the middle space to the lower space is provided in the stator outer circumferential passage not facing the frame outer circumferential passage. Allowing but is characterized in the provision of the gas flow throttling means for preventing upflow of gaseous fluid into the central space from the lower space.

A scroll compressor according to a second aspect of the present invention is a compressor having a combination of a fixed scroll, an orbiting scroll, and a frame, a stator having a coil end, In a scroll compressor which houses and arranges an electric motor unit composed of a rotor, an upper space in an airtight container in which a compressed gas fluid is discharged and a discharge pipe of the gas fluid are mounted on the outer side of a frame of the compressor unit. Two passages, a guide passage having a large opening area and a guide passage having a small opening area, which oppose each other, communicate with the inside space of the closed container. One outer periphery of a plurality of stators which communicates with a lower space in a closed vessel below a motor having an oil sump at the bottom and faces a guide passage having a large opening area. A passage is provided, and in the stator outer peripheral passage not facing the guide passage having a large opening area, the flow of the separated oil from the middle space to the lower space is allowed, but the flow from the lower space to the middle space is allowed. A gas flow restricting means for preventing the gas fluid from being blown up is provided.

[0013]

A gas guide passage frame provided with a gas fluid distribution means is provided in the middle space, and when the gas fluid flowing from the gas guide passage frame to the upper portion of the electric motor flows along the wall surface of the closed vessel, the oil flows onto the rotor. Does not flow, and re-dispersion of oil due to rotation of the rotor can be prevented.

The gas fluid flowing from the stator outer peripheral passage to the lower space of the motor is returned to the middle space only from the gap between the rotor and the stator of the motor (hereinafter referred to as an air gap). By providing the gas flow restricting means through which only a small amount of fluid passes, the amount of gas fluid ascending in the stator outer peripheral passage becomes small and does not hinder the fall of oil, so that an increase in oil rise can be prevented. Further, by flowing the gas fluid through the air gap, cooling of the entire electric motor is promoted.

[0015] By providing a shielding member on the outer periphery of the coil in the middle space side of the stator of the electric motor, oil droplets present on the outer periphery of the stator are prevented from entering the rotor side from the gap between the coils, thereby enabling the lower portion to be disposed. It is possible to prevent oil droplets from being mixed into the gas fluid returning from the space through the air gap, which is effective in reducing oil rising.

By providing a plurality of grooves on the outer periphery of the lower space side of the rotor of the electric motor, a rotating flow of a gas fluid containing oil is generated at the lower part of the electric motor, causing oil droplets to adhere to the inner wall of the closed container, thereby reducing airflow. It is possible to reduce oil droplets contained in the gas fluid rising from the gap and to reduce oil rising.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the scroll compressor according to the present invention will be described below.

FIG. 1 is a vertical sectional view of a scroll compressor. A scroll compressor in which a compressor unit 10 is connected to the upper part of the hermetic container 7 and a motor part 6 is connected to the lower part of the closed container 7 via the rotary shaft 3 is provided. Therefore, the interior of the sealed container 7 by the compressor unit 10 and the motor unit 6 includes an upper space 704 above the compressor unit 10, a middle space 705 between the compressor unit 10 and the motor unit 6, and a motor unit 6. It is divided into three spaces, a lower space 706 below. In the compressor section 10, the base plate 1
The fixed scroll 1 having a spiral wrap 102 standing upright on the base plate 01 and the orbiting scroll 2 having a spiral wrap 202 standing upright on a base plate 201 are meshed with the wraps 102 and 202 to form a compression mechanism. 1
Are provided with a suction port 103 and a discharge port 104.

The rotating shaft 3 is mounted on a bearing 401 of the frame 4.
And the bearing 402, and the tip end of the crankpin 30
1 and the crank pin 301 is provided with the orbiting scroll 2
Is inserted into a boss 203 protruding below the base plate 201 and is engaged with the orbiting scroll 2. An Oldham coupling 5 is disposed on the back of the orbiting scroll 2. The Oldham coupling 5 plays a role of a rotation preventing mechanism that causes the orbiting scroll 2 to make orbital movement without rotating with respect to the fixed scroll 1.

The motor unit 6 includes a rotor 608 to which the rotating shaft 3 is fitted and fixed, and a stator 60 surrounding the rotor 608.
And 7.

The frame 4 has a frame outer peripheral passage 403.
The gas guide passage frame 8 is provided in the middle space 705 immediately below the frame outer peripheral passage 403. FIG. 2 shows a perspective view of the gas guide passage frame 8. The gas guide passage frame 8 is provided with a passage direction outlet 801, a closed container inner wall circumferential direction outlet 802, a collision plate 803, and a rectifying plate 804.

FIG. 3 shows the positional relationship between the gas guide passage frame 8 and the stator outer peripheral passage 601 of the electric motor unit 6. FIG. 3 is a view of the electric motor unit 6 as viewed from above. The stator 607 is provided with a plurality of stator outer peripheral passages 601, and a stator outer peripheral passage 601 a is provided immediately below the gas guide passage frame 8.

Except for the stator outer peripheral passage 601a immediately below the gas guide passage frame 8, other stator outer peripheral passages 601b include:
Gas flow restricting means 9 is provided. FIG. 4 shows the structure of the gas flow restricting means. FIG. 4 is a view of the electric motor unit 6 as viewed from below. The gas flow restrictor 9 is constituted by micro holes 902 provided in the plate 901. Gas flow restricting means 9
Are fixed to the stator 607 by welding.

As shown in FIG. 1, a shield member 603 made of an electric insulating film is provided on the outer periphery of the stator coil 602 of the electric motor unit 6. A plurality of grooves 604 are provided on the outer periphery of the lower part of the rotor.

Referring to FIG. 1, the operation of the compressor will be described. The compressor unit 10 includes a rotating shaft 3 connected to the electric motor unit 6.
When the crank pin 301 is eccentrically rotated by the rotation of the rotation, the orbiting scroll 2 performs an orbiting motion without rotating with respect to the fixed scroll 1 by the anti-rotation mechanism of the Oldham coupling 5, and the gas fluid flows through the suction pipe 701 and the suction port 103. The air is sucked into the closed chamber formed by the wraps 102 and 202. Due to the above-mentioned swirling motion, the closed chamber moves to the center, reduces the volume, compresses the gas fluid, and discharges the compressed gas fluid into the closed container 7 from the discharge port 104.

The back pressure chamber 404 communicates with the closed chamber in the middle of compression through the back pressure hole 204, and is maintained at a pressure intermediate between the suction pressure and the discharge pressure of the gas fluid. The bearings 401 and 402 of the compressor unit 10 have a sealed container 7 having a discharge pressure equal to the discharge pressure.
The sump 703 is determined by the pressure difference between the internal pressure and the pressure of the back pressure chamber 404.
Oil is refueled. The oil that has reached the back pressure chamber 404 flows into the closed chamber via the back pressure hole 204. The inflowing oil is discharged into the upper space 704 again from the discharge port 104 together with the gas fluid.

The discharged gas fluid and oil pass through the groove-shaped frame outer peripheral passage 403 provided in the frame 4 and are guided to the gas guide passage frame 8. The gas fluid and part of the oil are shown in FIG.
Is discharged from the peripheral container outlet 802 in the direction of rotation of the motor along the inner wall of the closed container 7 in the middle space 705. When exiting from the outlet 802 in the circumferential direction of the inner wall of the sealed container, the oil droplets become larger by colliding with the collision plate 803, and are separated from the gas fluid by flowing while adhering to the inner wall of the sealed container 7 by centrifugal force.

The separated oil falls downward from the stator outer peripheral passage 601b shown in FIG. 3 and drops into the lower space 706 from the fine holes 902 of the gas flow restrictor 9 shown in FIG. Return. The shielding member 603 provided on the outer periphery of the stator coil 602 prevents oil droplets being separated from entering the rotor. The gas fluid is discharged from the discharge pipe 702 out of the compressor.

On the other hand, a part of the gas fluid and oil entering the gas guide passage frame 8 exits from the passage direction outlet 801 and flows into the stator outer peripheral passage 601a and flows into the lower space 706. Since a plurality of grooves 604 are provided on the outer periphery of the lower part of the rotor 608, the inflowing gas fluid and oil become a rotational flow flowing in the motor rotation direction in the motor lower space.

The oil is separated from the gas fluid by flowing down while adhering to the closed container 7 by centrifugal force.
Return to 3. The gas fluid flows through the small holes 902 of the gas flow restricting means 9 provided in the stator outer peripheral passage 601b other than immediately below the gas guide passage frame 8, so that the stator outer peripheral passage 60
Only a small amount flows into 1 b, and most of the gas fluid returning from the lower space 706 to the middle space 705 rises through the air gap 605. The raised gas fluid reaches the middle space 705 and is discharged from the discharge pipe 702 to the outside of the compressor. As described above, the gas fluid flows around the lower part of the motor and rises through the air gap 605, so that the cooling of the motor is ensured.

FIG. 5 shows a second embodiment of the gas flow restricting means 9. This is an example in which a notch 903 is provided in a plate material 901, and a fine hole is formed by the inner wall of the closed container 7 and the notch 903.

FIG. 6 shows a third embodiment of the gas flow restricting means 9. This is an example in the case of press-fitting and assembling into a closed container 7,
An outer peripheral member 904 is provided, and a recessed portion 904b is recessed to apply a radial spring force to fix and hold the recessed portion 904b on the inner wall of the sealed container 7. At the time of assembly, the surface provided with the micro holes 902 is
It is provided so as to be in close contact with the stator 607. The positional relationship between the micro holes 902 and the stator outer circumferential passages 601a and 601b is shown in FIG.
Is the same as The recess 904a is for flowing a gas fluid, and faces the stator outer peripheral passage 601a.

FIG. 7 shows a fourth embodiment of the gas flow restricting means 9. This is an example in which the gas flow restricting means 9 is formed by a part of the laminated plate 606 of the stator 607. This is an example in which a notch 903 is provided in one laminated plate at the end of the stator 607, and a microhole is formed by the notch 903 and the inner wall of the sealed container 7.

FIG. 8 shows another embodiment in which the guide passage is constituted by a part of the frame. The frame 4 has a guide passage 403a having a large opening area and a guide passage 4 having a small opening area.
03b is provided. Guideway 4 with large opening area
From 03a, gas fluid and oil are discharged.

The gas fluid and oil discharged into the middle space 705 flow into the stator outer peripheral passage 601a by inertia. In particular, the oil has a large density and therefore a large inertial force, and most of the oil enters the stator outer peripheral passage 601a. Stator outer peripheral passage 601a
The gas fluid that does not enter the discharge port is discharged from the discharge pipe 702.
The gas fluid flowing into the lower space 706 is
After returning to the central space 705 through the discharge pipe 05, the liquid is discharged from the discharge pipe 702.

Oil accumulates in the guide passage 403b having a small opening area and gradually flows down along the wall surface of the sealed container 7 from the opening. The oil passes through the stator outer peripheral passage 601b provided with the gas flow restrictor 9, and returns to the oil sump 703. The effect of the gas flow restrictor 9 is the same as that of the above embodiment.

[0037]

According to the present invention, the resistance of the gas fluid to the gas flow restricting means provided in the gas guide passage frame or in the outer peripheral passage of the stator other than immediately below the guide passage having a large opening area becomes a resistance. Thus, only a small amount flows in the stator outer peripheral passage, and oil rising due to the upward flow of the gas fluid can be reduced. Also, most of the gas fluid returning from the lower space to the middle space rises through the air gap, ensuring cooling of the motor.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of a gas guide passage frame according to a first embodiment of the present invention.

FIG. 3 is a first embodiment of the present invention and shows a positional relationship between a gas guide passage frame and an electric motor.

FIG. 4 is a first embodiment of the present invention and shows a structural view of a gas flow restrictor.

FIG. 5 is a second embodiment of the present invention, and shows a structural view of a gas flow restricting means.

FIG. 6 is a third embodiment of the present invention and shows a structural view of a gas flow restricting means.

FIG. 7 is a fourth embodiment of the present invention, and shows a structural diagram of a gas flow restrictor.

FIG. 8 is a vertical sectional view of a scroll compressor according to another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fixed scroll 101 base plate 102 wrap 103 suction port 104 discharge port 2 orbiting scroll 201 base plate 202 wrap 203 boss 204 back pressure hole 3 rotary shaft 301 crank pin 4 frame 401 Bearing 402 ... Bearing 403 ... Frame outer periphery passage 403a, 403b ... Guide passage 404 ... Back pressure chamber 5 ... Oldham coupling 6 ... Electric motor unit 601, 601a, 601b ... Stator outer periphery passage 602 ... Stator coil 603 ... Shielding member 604 ... Groove 605 air gap 606 laminated plate 607 stator 608 rotor 7 airtight container 701 suction pipe 702 discharge pipe 703 oil sump 704 upper space 705 middle space 706 lower space 8 gas guide passage frame 801: Exit in the direction of passage 802: Exit in the circumferential direction of the inner wall of the sealed container 803: Impact plate 04 ... rectifying plate 9 ... gas flow throttle means 901 ... sheet 902 ... microporous 903 ... notch 904 ... outer peripheral member 904a, 904b ... recess 10 ... compressor unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akihito Orii 7-2-1, Omika-cho, Hitachi City, Ibaraki Pref. Hitachi, Ltd. Electric Power and Electric Development Laboratory (72) Inventor Hiroyuki Imamura 390 Muramatsu, Shimizu-shi, Shizuoka Address Hitachi Shimizu Engineering Co., Ltd. (72) Inventor Yu Otawara 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture F-term in Hitachi Air Conditioning Systems Shimizu Production Headquarters (reference) 3H029 AA02 AA14 AB02 AB03 BB04 CC44 3H039 AA06 BB16 CC26

Claims (7)

[Claims] 1. A compressor comprising a fixed scroll, an orbiting scroll and a frame combined with each other, and an electric motor comprising a stator having a coil end and a rotor, are housed and disposed in a closed container. One frame outer peripheral passage that communicates between the upper space in the sealed container from which the compressed gas fluid is discharged and the inner space in the sealed container on the upper side of the electric motor to which the discharge pipe for the gas fluid is attached, On the outside of the stator of the electric motor portion, a middle space in the closed container and a lower space in the closed container below the electric motor having an oil reservoir at the bottom communicate with a plurality of fixed members facing one of the frame outer peripheral passages. In the scroll compressor provided with each of the outer peripheral passages, the frame is provided in an annular space formed between the inner wall surface of the hermetic container and the outer peripheral surface of the upper coil end of the motor unit. Install the U-shaped cross section of the gas guiding passage frame connecting together one of the outer circumferential passage and the stator outer periphery passage disposed,
The gas guide passage frame has a U-shaped cross section and a lower end than the upper end surface of the coil end, and has an outlet in the circumferential direction of the inner peripheral wall of the closed container, and at least one collision with the outlet is performed. A plate is provided, and a rectifying plate is provided at an upper end portion of the collision plate to prevent a flow of gas fluid upward, and the stator outer peripheral passage not facing the frame outer peripheral passage has the middle space. A scroll compressor provided with gas flow restricting means for allowing the separated oil to flow from the lower space to the lower space, but for preventing the gas fluid from blowing up from the lower space to the middle space. 2. A scroll compressor in which a compressor unit comprising a combination of a fixed scroll, an orbiting scroll and a frame and an electric motor unit comprising a stator and a rotor having coil ends are housed and arranged inside a closed container. In the outside of the frame of the compressor section, the opening area of the opposed facing areas that communicates the upper space in the closed vessel from which the compressed gas fluid is discharged and the middle space in the closed vessel on the upper side of the electric motor to which the discharge pipe of the gas fluid is attached. Two passages, a large guide passage and a small guide passage, are provided outside the stator of the electric motor unit, and a middle space inside the airtight container and a lower space inside the closed air container below the electric motor having an oil reservoir at the bottom. And one is provided with a plurality of stator outer circumferential passages facing the guide passage having the large opening area, and the fixed is not facing the guide passage having the large opening area. The outer peripheral passage is provided with gas flow restricting means for allowing the separated oil to flow from the middle space to the lower space, but for preventing the gas fluid from being blown up from the lower space to the middle space. Features scroll compressor. 3. The gas flow restricting means according to claim 1, wherein the gas flow restricting means is a plate member having fine holes serving as restricting means disposed so as to close the stator outer peripheral passage. Scroll compressor. 4. The gas flow restricting means according to claim 1, wherein the gas flow restricting means is a plate member having a cutout as a restricting means disposed so as to close the stator outer peripheral passage. Scroll compressor. 5. The scroll compressor according to claim 3, wherein a part of a laminated plate forming the stator is used as the plate material. 6. The scroll compressor according to claim 1, wherein a shielding member is provided on an outer periphery of the motor coil end on the middle space side. 7. An outer periphery on the lower space side of the rotor,
The scroll compressor according to claim 1, further comprising a plurality of grooves.