JP2002317775A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor offering construction for hardly causing the discharge of a lubricant to the outside of the scroll compressor. SOLUTION: The scroll compressor 10 comprises a cylindrical sealed container 2 partitioned into a cooling medium discharge chamber 21 and a motor chamber 22 with a main frame 4 and a cooling medium compression part 3 arranged at the upper part of a motor 6, wherein an opening portion 241 of a cooling medium discharge pipe 24 provided in the motor chamber 22 is set inside of the inner diameter of a stator 62 of the motor 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used in a refrigeration cycle such as an air conditioner, and more particularly, to a structure in which lubricating oil is structurally hardly discharged into a refrigeration cycle. TECHNICAL FIELD The present invention relates to a scroll compressor that does not cause seizure of heat or a decrease in heat exchange efficiency of a refrigeration cycle.

[0002]

2. Description of the Related Art A scroll compressor is switched between an internal high-pressure type and an internal low-pressure type in which the motor chamber is operated at discharge pressure, an internal low-pressure type which operates with suction pressure, and a four-way valve of a refrigeration cycle. Among the possible hybrid types, FIG. 9 shows an example of an internal high-pressure type scroll compressor used in a refrigeration cycle of an air conditioner.

[0003] The scroll compressor 1 includes a closed container 2 having an interior partitioned by a main frame 4 into a refrigerant discharge chamber 21 and an electric motor chamber 22, and includes a fixed scroll 31 and a revolving scroll 32 on the refrigerant discharge chamber 21 side. The refrigerant compressor 3 is accommodated therein, and the electric motor 6 having the rotary drive shaft 5 for rotating the orbiting scroll 32 is accommodated in the electric motor room 22. A certain amount of lubricating oil O is stored in the closed container 2.

When the internal high-pressure scroll compressor 1 is operated, the low-pressure refrigerant, which has completed its work in a refrigeration cycle (not shown), is sent from the refrigerant return pipe 23 into the closed working chamber 33 in the refrigerant compression section 3 and the center of the scroll. The refrigerant is gradually compressed in the direction to become a high-pressure refrigerant, and is discharged from a refrigerant discharge chamber 21 through a discharge port 311 provided at the upper center of the fixed scroll 31.
After being discharged into the motor frame 22, the refrigerant is conveyed into the electric motor room 22 through the refrigerant passage 34 provided in the main frame 4, and is sent out from the refrigerant discharge pipe 24 to the refrigeration cycle.

In the scroll compressor 1, in order to reduce leakage of the refrigerant gas in the refrigerant compression section 3 and to prevent seizure of the fixed scroll 31 and the orbiting scroll 32, the scroll compressor 1 is provided with a rotary drive shaft 5. Refueling hole 53
The lubricating oil O is sucked up from the bottom of the closed container 2 and injected into each sliding surface of the refrigerant compression unit 3.

The lubricating oil O injected into the refrigerant compression section 3 is transported together with the high-pressure refrigerant to the motor room 22 through the refrigerant passage 34, and is separated from the high-pressure refrigerant gas and returned to the oil catch at the bottom of the motor room 22. It is.

[0007]

However, in the vertical scroll compressor 1 in which the refrigerant compression section 3 is located above the electric motor 6 as shown in FIG. 9, the space in which the lubricating oil is separated is substantially equal to the electric motor. 6, that is, only in the space between the main frame 4 and the electric motor 6, and it has been difficult to sufficiently separate the refrigerant gas and the lubricating oil O with this.

In addition, the lubricating oil O is blown off toward the inner wall surface of the closed casing 2 by the centrifugal force caused by the rotation of the rotor 61 of the electric motor 6, so that not less than a small amount of the lubricating oil O is discharged together with the high-pressure refrigerant gas into the refrigerant discharge pipe. Since it is sent to the refrigeration cycle from the refrigeration cycle, there is a possibility that the heat efficiency in the heat exchanger in the refrigeration cycle is reduced, or that the lubrication oil in the compressor is insufficient, resulting in burning.

Accordingly, the present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a vertical type scroll compressor in which a refrigerant compression unit is arranged above a closed container, and thus, a structural problem is solved. An object of the present invention is to make it difficult for the lubricating oil to be discharged into the refrigeration cycle, thereby preventing seizure in the compression section and a decrease in heat exchange efficiency of the refrigeration cycle.

[0010]

In order to achieve the above-mentioned object, the present invention comprises a tubular hermetic container having a main frame divided into a refrigerant discharge chamber and an electric motor chamber, and has a cylindrical airtight container on the refrigerant discharge chamber side. A refrigerant compression unit including a fixed scroll and an orbiting scroll is housed, and an electric motor having a rotary drive shaft for driving the orbiting scroll is housed in the electric motor room, and a refrigerant discharge connected to a refrigeration cycle in the electric motor room. In a vertical scroll compressor in which the pipe is drawn in and the refrigerant compression section is disposed above the electric motor, the opening of the refrigerant discharge pipe is disposed inside the inner diameter of the stator coil of the electric motor. It is characterized by being.

According to this, since the opening of the refrigerant discharge pipe provided in the motor chamber is provided inside the inner diameter of the stator coil, a large amount of lubricating oil present on the outer peripheral side of the closed vessel is discharged to the refrigeration cycle. A refrigeration cycle with good heat exchange efficiency is obtained.

Two refrigerant pipes connected to the refrigeration cycle are drawn into the motor chamber, and the motor chamber is selectively switched to either a discharge pressure or a suction pressure by a four-way valve included in the refrigeration cycle. A hybrid type compressor that is operated while being switched, and the opening of the one refrigerant pipe that is on the refrigerant discharge side during the discharge pressure operation,
By being disposed inside the inner diameter of the stator coil of the electric motor, even in a hybrid scroll compressor having originally good heat exchange efficiency, a higher heat exchange rate can be obtained by suppressing discharge of lubricating oil. .

It is preferable that the opening of the refrigerant discharge pipe is directed toward the rotor of the electric motor, whereby the mixing of lubricating oil can be further suppressed.

[0014] A cylindrical cover smaller in diameter than the rotor diameter of the electric motor is provided coaxially with the rotary drive shaft on the main frame on the electric motor room side, and the refrigerant discharge pipe is provided in the cover. Is provided, the discharge path of the refrigerant in the motor chamber is set at one cushion, whereby the discharge of the lubricating oil is more effectively prevented.

In a more preferred aspect, it is preferable that a part or all of the upper balance weight provided on the rotor of the electric motor is accommodated in the cover. According to this, since the lubricating oil present in the cover is blown to the inner wall of the cover by the centrifugal force of the balance weight, the mixing of the lubricating oil can be more reliably prevented.

Further, a flange portion bent toward the inner diameter direction may be provided at a lower end of the cover, whereby a narrow passage is formed between the flange portion of the cover and the balance weight. Thus, it is possible to prevent the lubricating oil from entering the cover.

As another aspect, a centrifugal separator made of a disk that rotates about the axis of the rotary drive shaft may be provided on the upper balance weight provided on the rotor of the electric motor. According to this, the lubricating oil in the motor room can be blown off to the inner wall surface of the sealed container by using the centrifugal force.

An upper balance weight provided on the rotor of the electric motor has a disc-shaped centrifugal separator integrally formed on the upper surface, and a flat cylinder provided with a recess of a predetermined size on the joint surface side with the rotor. Shaped.
According to this, the lubricating oil can be blown out by the upper surface of the cylindrical body acting as the centrifugal separator.

In order to discharge the lubricating oil accumulated in the recess to the outside, it is preferable that the balance weight is provided with a hole or a groove communicating with the recess. Also,
A groove communicating with the concave portion may be provided on the joint surface of the rotor with the balance weight, and the same operation and effect can be obtained in such a case.

In order to more effectively wipe off the attached lubricating oil, the centrifugal separator of the balance weight is preferably provided with a plurality of radial grooves in the radial direction. Although the shape of the radiation groove is not particularly limited, for example, a shape provided in parallel along the radial direction, a shape provided in a spiral shape along the rotation direction of the electric motor, and the like are mentioned as preferable embodiments.

[0021]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the first embodiment of the present invention.
1 shows a cross-sectional view of a scroll compressor according to an embodiment. Note that the same reference numerals are used for components that are the same as or deemed to be the same as those of the conventional device of FIG. 9 described above.

The scroll compressor 10 comprises a vertically arranged cylindrical closed container 2 having a main frame 4 sandwiched between a refrigerant discharge chamber 21 on the upper side and a motor chamber 22 on the lower side. The refrigerant compression section 3 including the fixed scroll 31 and the orbiting scroll 32 is housed in 21, and the electric motor 6 having the rotary drive shaft 5 for driving the orbiting scroll 32 is housed in the electric motor room 13. A fixed amount of lubricating oil O is stored at the bottom of the sealed container 2.

The refrigerant compression section 3 has a closed working chamber 33 formed therein by engaging the scroll wraps of the fixed scroll 31 and the orbiting scroll 32 with each other. A boss 321 to which the crankshaft 52 of the rotary drive shaft 5 is connected is provided on the back surface of the orbiting scroll 32.

A refrigerant return pipe 23 for introducing low-pressure refrigerant returned from the refrigeration cycle into the closed working chamber 33 is connected to the refrigerant compression section 3. A refrigerant discharge hole 311 for discharging the compressed high-pressure refrigerant from the closed working chamber 33 to the refrigerant discharge chamber 21 is provided at the upper center of the fixed scroll 31.

The electric motor 6 comprises a rotor 61 coaxially mounted on the main shaft 51 of the rotary drive shaft 5 and a stator 62 provided on the outer periphery of the rotor 61. Are provided. A plurality of coils 621 for generating a magnetic force for rotating the rotor 61 are wound around the stator 62.

A refrigerant discharge pipe 24 for sending the refrigerant to the refrigeration cycle is drawn into the motor room 22.
In this embodiment, the refrigerant discharge pipe 23 is disposed in a space between the main frame 4 and the electric motor 6, and is provided from the outer peripheral surface of the closed casing 2 toward the rotation drive shaft 5.

An opening 241 for sucking the refrigerant into the pipe is provided at the tip of the refrigerant discharge pipe 24. In this embodiment, the opening 241 of the refrigerant discharge pipe 24 is provided on the inner diameter side of the coil end of the stator 62 in the electric motor chamber 22 (indicated by a one-dot chain line in FIG. 1), that is, on the rotary drive shaft 5 side. ing.

The scroll compressor 10 is of a so-called internal high pressure type, in which the high-pressure refrigerant generated in the refrigerant compression section 3 is once sent to the refrigeration cycle while bypassing the motor room 22. That is, from the refrigerant return pipe 23 to the closed working chamber 33
The low-pressure refrigerant guided into the inside is compressed while moving to the center of the orbiting scroll 32 by the orbital motion, and is compressed.
11 is discharged into the refrigerant discharge chamber 21 as a high-pressure refrigerant.

The high-pressure refrigerant discharged into the refrigerant discharge chamber 21 is transported to the motor room 22 through the fixed scroll 31 and a refrigerant passage 34 provided in a part of the main frame 4 and then into the motor room 22. The refrigerant is sent out from the provided refrigerant discharge pipe 24 to the refrigeration cycle.

At this time, the lubricating oil O stored at the bottom of the sealed container 2 is supplied to the refrigerant compression unit 3 through an oil supply hole 53 provided in the rotary drive shaft 5, and the fixed scroll 31 and the orbiting scroll 32 An oil film is formed on the sliding contact surface between them to effectively prevent refrigerant from leaking due to the sealing effect.

The lubricating oil O supplied into the refrigerant compression section 3 is
After being discharged into the refrigerant discharge chamber 21 together with the high-pressure refrigerant, the refrigerant is returned to the motor room 22 through the refrigerant passage 34.

The lubricating oil O returned into the electric motor room 22 adheres to the wall surface and drops when passing through the refrigerant passage 34,
Due to the rotation of the rotor 61 or the like, it adheres to the inner wall surface side of the closed container 2 or is stored again at the bottom of the closed container 2.

According to the present invention, the opening 241 of the refrigerant discharge pipe 24 is located on the inner diameter side of the coil end of the stator 62 in the electric motor chamber 22 (indicated by a dashed line in FIG. 1), that is, the rotary drive shaft 5. The lubricating oil O, which is largely present on the inner wall surface side of the closed container 2, is provided on the refrigerant discharge pipe 2.
4, the heat exchange efficiency of the refrigeration cycle is improved.

The lubricating oil O returned from the bearing of the main frame 4 to the motor chamber 22 along the rotary drive shaft 5 is
The opening 241 of the refrigerant discharge pipe 24 is preferably provided so as to be substantially perpendicular to the axis of the rotary drive shaft 5 because the rotary drive shaft 5 is blown outward by the rotational centrifugal force. According to this, it is possible to prevent the lubricating oil O blown off from the rotary drive shaft 5 from directly mixing into the refrigerant discharge pipe 24.

As another method, for example, the opening 24
One side is bent at a right angle toward the motor 6 (FIG. 2).
), An end of the refrigerant discharge pipe 24 is closed, and an opening 241 perpendicular to the axial direction of the refrigerant discharge pipe 24 is provided around the end.
May be provided.

Next, FIGS. 2 and 3 show the second embodiment of the present invention.
1 shows a scroll compressor according to an embodiment. The main configuration of the scroll compressor 11 is the same as that of the above-described embodiment, and a description thereof will be omitted. In this embodiment, the characteristic portions are denoted by reference numeral 7.
This is the centrifugal separation plate 7 indicated by.

The centrifugal separation plate 7 is made of a disk made of metal, resin, or the like, and is integrally attached to the balance weight 63 above the rotor 61 by screwing or the like. The centrifugal separation plate 7 is provided so as to rotate coaxially with the axis of the rotary drive shaft 5 so as not to hinder the rotational movement of the rotor 61. 241 are provided so as to be parallel to the plate surface of the centrifugal separation plate 7.

That is, as schematically shown in FIG. 3, the lubricating oil O floating near the opening 241 of the refrigerant discharge pipe 24 adheres to the centrifugal plate 7 by the rotation of the centrifugal plate 7 and is centrifuged. It is blown off in the outer circumferential direction by the force. Accordingly, the amount of the lubricating oil O is reduced in the vicinity of the centrifugal separation plate 7, and the mixing of the lubricating oil O can be further suppressed by arranging the opening 241 of the refrigerant discharge pipe 24 in the vicinity thereof.

FIG. 4 shows a third embodiment.
In this embodiment, a balance weight 8 composed of a cylindrical body rotatable coaxially with the axis thereof is provided on the upper end side of the rotor 61, and refrigerant is discharged toward the upper end surface 81 of the balance weight 8. Opening 241 of tube 24
Are bent almost at right angles.

FIG. 5A is a detailed drawing of the balance weight 8. The balance weight 8 is made of, for example, a cylindrical body made of brass, and has an upper end surface 81 having a flat surface like the centrifugal separation plate 7, and an upper end surface 81 at the center thereof.
A bearing hole 811 through which the rotary drive shaft 5 is inserted is provided from the lower end surface (the contact surface with the rotor 61) to the lower end surface.

The inside of the balance weight 8 is a weight portion 82 filled with metal for approximately half of the circumference, and the remaining half of the balance weight 8 is a concave portion 83 which is hollowed out when viewed from the contact surface side. In addition, balance weight 8
A plurality of insertion holes 84 for discharging the lubricating oil O accumulated in the concave portion 83 are provided on the side surface located at the concave portion 83, and three semicircular portions are provided on the lower end surface side of the side surface in this embodiment. I have.

In this embodiment, a plurality of insertion holes 84 are provided at the lower end of the side surface of the balance weight 8.
In addition, a groove or a hole communicating with the concave portion 83 may be provided on the upper end surface of the rotor 61 to which the balance weight 8 is attached, so that the same oil draining effect can be obtained.

As shown in FIG. 5B, by providing a plurality of radial grooves 812 along the radial direction on the upper end surface 81 of the balance weight 8, the lubricating oil O in the refrigerant gas is directed outward. Easy to fly. This radiation groove 812 may be provided not only on the balance weight 8 but also on the surface of the centrifugal separation plate 7 described above.

In this embodiment, the radiation grooves 81
2 is provided in the radial direction from the center of the balance weight 8, but may be provided spirally along the rotation direction of the rotor 61, for example, and the shape is not particularly limited.
Further, the radiation groove 812 is formed by depressing a part of the upper end surface 81, but may be provided in a convex shape, for example, and in this case, it becomes a radiation convex portion.

According to this, since the cylindrical balance weight 8 is provided coaxially on the rotor 61, the function and effect of the centrifugal separator 7 of the second modification described above are integrated into the balance weight 8. And the number of man-hours for parts can be reduced.

FIG. 6 shows a scroll compressor according to a fourth embodiment of the present invention. The configuration of the scroll compressor 12 is also substantially the same as that of each of the above embodiments, and therefore, detailed description thereof will not be given.

The scroll compressor 12 has a cylindrical cover 9 on the main frame 4 in the motor chamber 22 as a means for preventing lubricating oil O from being mixed into the refrigerant discharge pipe 24. An opening 24 of the refrigerant discharge pipe 24 is provided inside the cover 9.
1 is provided.

The cover 9 is made of a hollow cylindrical pipe having an outer diameter smaller than that of the rotor 61 of the electric motor 6, and has a flange portion 91 whose upper end is bent outward.
It is mounted on the main frame 4 so as to be coaxial with the rotary drive shaft 5 via the flange portion 91.

An opening 92 is formed at the other end of the cover 9, and the opening is provided between the upper end of the rotor 61 and the upper end of the balance weight 63. In this embodiment, the balance weight 63 enters the opening range of the opening 92.

According to this, the lubricating oil O present in the cover 9 is blown off to the inner wall surface of the cover 9 by the centrifugal force of the balance weight 63 and drops on the rotor 61, and this time, the centrifugal force of the rotor 61 Since it is blown off to the inner wall surface of the sealed container 2, it is difficult to be sucked into the refrigerant discharge pipe 24.

FIG. 7 shows a modification of the fourth embodiment. In this modification, the cover 9 is provided with an inner flange 93 on the lower end side. Inner flange 93
Is formed by bending the lower end side into a donut shape toward the inner diameter direction, and an opening 92 is provided at the center thereof.

In this embodiment, the flat cylindrical balance weight 8 described in the third embodiment is provided at the upper end of the rotor 61, and the minute weight is provided between the cover 9 and the balance weight 8. Gap is formed.

According to this, when the lubricating oil O passes through the gap between the cover 9 and the balance weight 8, it is blown outward by the centrifugal force of the balance weight 8. Mixing of the lubricating oil O into the oil can be reduced.

The compressor structure of the present invention can be applied to a case where the motor chamber is of a hybrid type capable of switching to a discharge pressure or a suction pressure via a four-way valve of a refrigeration cycle. FIG. 8 shows an example.

The scroll compressor 13 has a four-way valve 10
0, which is applied to a refrigeration cycle unit composed of an outdoor heat exchanger 110, an indoor heat exchanger 120, and an expansion valve 130, wherein the inside of a closed vessel 2 sandwiches a main frame 4 and a refrigerant discharge chamber 21 (Upper side) and motor room 22
(Lower side). Note that the arrangement of the refrigerant compression unit 3 and the electric motor 6 is the same as in each of the above-described embodiments, and a description thereof will be omitted.

The refrigerant discharge chamber 22 is provided with a high-pressure refrigerant discharge pipe 25 for sending out the high-pressure refrigerant generated by the refrigerant compression section 3 to the four-way valve 100. The four-way valve 100
The delivered high-pressure refrigerant can be switched to the indoor heat exchanger 120 or the electric motor room 22. That is, the four-way valve 100
Are switched as shown by a solid line in the cooling operation and as shown by a chain line in the heating operation.

In the motor room 22, two refrigerant pipes 24
a, 24b are provided. One first refrigerant pipe 24
a is connected to the outdoor heat exchanger 110 of the refrigeration cycle unit. The other second refrigerant pipe 24 b is connected to the four-way valve 100.

According to this, the refrigeration cycle during the cooling operation is as follows: the refrigerant compression section 3 → the refrigerant discharge chamber 21 → the high pressure refrigerant discharge pipe 2
5 → four-way valve 100 → second refrigerant pipe 24b → motor chamber 22
→ The first refrigerant pipe 24a → the outdoor heat exchanger 110 → the expansion valve 130 → the indoor heat exchanger 120 → the four-way valve 100 → the refrigerant return pipe 23 → the refrigerant compression section 3.

The refrigeration cycle during the heating operation is as follows: the refrigerant compression section 3 → the refrigerant discharge chamber 21 → the high pressure refrigerant discharge pipe 25 → the four-way valve 100 → the indoor heat exchanger 120 → the expansion valve 130 → the outdoor heat exchanger 110 → 1st refrigerant pipe 24a → motor room 22
→ second refrigerant pipe 24b → four-way valve 100 → refrigerant return pipe 23
→ It becomes the refrigerant compression section 3.

In this embodiment, the outdoor heat exchanger 1
Opening 241 of first refrigerant pipe 24a connected to 10
Is provided on the inner diameter side of the coil of the stator 62 of the electric motor 6, that is, on the rotary drive shaft 5 side.

According to this, when the inside of the motor room 22 is discharged through the four-way valve 100, that is, when the cooling operation is performed, the lubricating oil O present in the motor room 22 is removed from the second refrigerant pipe 24b by the motor. It becomes difficult for the high-pressure refrigerant guided into the chamber 22 to be discharged to the outdoor heat exchanger 110, and high heat exchange efficiency can be obtained in the outdoor heat exchanger 110.

When the high-pressure refrigerant is sent to the indoor heat exchanger 120 via the four-way valve 100 as in the heating operation, the interior of the motor room 22 is set to the suction pressure and passed through the motor room 22. Since the low-pressure refrigerant is introduced into the refrigerant compression section 3 through the four-way valve 100, the second refrigerant pipe 2
There is no particular need to provide the 4b inside the coil end of the stator 62 like the first refrigerant pipe 24a.

In this embodiment, the cylindrical balance weight 8 exemplified in the second embodiment is attached to the rotor 61.
Is provided. According to this, mixing of lubricating oil can be further prevented by the centrifugal force effect.

In addition, besides this, the cover 9 used in the third embodiment may be provided, or the centrifugal separation plate 7 may be attached. Furthermore, the opening 25 of the first refrigerant pipe 25
1 may be installed facing the electric motor 6.

[0065]

As described above, according to the present invention,
In a vertically mounted scroll compressor in which a refrigerant compression unit is disposed at an upper part of a closed container and an electric motor is disposed at a lower side, an opening of a refrigerant discharge pipe provided in an electric motor room is larger than an inner diameter of a stator coil of the electric motor. By being disposed inside, the lubricating oil, which is largely present on the inner wall side of the closed vessel, is not easily discharged to the refrigeration cycle together with the high-pressure refrigerant, and a decrease in the heat exchanger efficiency of the refrigeration cycle can be prevented.

Since the opening of the refrigerant discharge pipe is directed toward the rotor of the electric motor, the intrusion of lubricating oil can be further suppressed.

On the main frame on the motor room side, a cylindrical cover smaller in diameter than the rotor diameter of the motor is provided coaxially with respect to the rotary drive shaft, and an opening for the refrigerant discharge pipe is provided in the cover. Thus, mixing of lubricating oil can be further prevented by placing one cushion on the moving path of the refrigerant.

Further, the upper balance weight provided on the rotor of the electric motor is provided with a centrifugal separator made of a disk that rotates about the axis of the rotary drive shaft, so that the lubricating oil present in the electric motor chamber can be removed from the closed container. It can be blown off against the wall surface, and the mixing of the lubricating oil into the discharge pipe can be effectively suppressed.

Further, the upper balance weight provided on the rotor of the electric motor has a flat centrifugal separation plate made of a disc body on the upper surface, and has a flat portion having a recess of a predetermined size on the joint surface side with the rotor. By being formed in a cylindrical shape, the upper end side of the cylindrical body performs a centrifugal separation operation, so that the lubricating oil can be blown outward.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a scroll compressor according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram for explaining a centrifugal separation operation of the second embodiment.

FIG. 4 is a partial sectional view of a scroll compressor according to a third embodiment of the present invention.

FIG. 5 is a perspective view of a detailed structure and a modification of the balance weight according to the third embodiment.

FIG. 6 is a partial cross-sectional view of a scroll compressor according to a fourth embodiment of the present invention.

FIG. 7 is a partial sectional view showing a modification of the fourth embodiment.

FIG. 8 is a schematic diagram showing a state where the compressor structure of the present invention is applied to a hybrid refrigeration cycle.

FIG. 9 is a cross-sectional view of a conventional scroll compressor.

[Explanation of symbols]

 10, 11, 12, 13 Scroll compressor 2 Closed vessel 21 Refrigerant discharge chamber 22 Electric motor chamber 23 Refrigerant return pipe 24 Refrigerant discharge pipe 24a First refrigerant pipe 24b Second refrigerant pipe 25 High-pressure refrigerant discharge pipe 3 Refrigerant compressor 31 Fixed scroll 32 Orbiting scroll 33 Sealed working chamber 34 Refrigerant passage 4 Main frame 5 Rotary drive shaft 6 Electric motor 61 Rotor 62 Stator 63 Balance weight 7 Centrifugal separator 8 Balance weight 81 Upper end surface 82 Weight portion 83 Depression 84 Insertion hole 9 Cover

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H029 AA02 AA14 AB03 BB05 BB32 BB35 CC04 CC07 CC09 CC23 CC25 CC27 CC30 CC33 CC44 3H039 AA03 AA04 AA12 BB08 BB11 BB16 CC20 CC27 CC29 CC32 CC33 CC42

Claims (11)

[Claims] 1. A cooling system comprising: a cylindrical hermetic container having an interior partitioned into a refrigerant discharge chamber and an electric motor chamber by a main frame; and a refrigerant compression section comprising a fixed scroll and an orbiting scroll housed in the refrigerant discharge chamber. An electric motor having a rotary drive shaft for driving the orbiting scroll is housed in the electric motor room, and a refrigerant discharge pipe connected to a refrigeration cycle is drawn into the electric motor room, and the refrigerant compression section of the electric motor is A vertically arranged scroll compressor disposed at an upper portion, wherein an opening of the refrigerant discharge pipe is disposed inside an inner diameter of a stator coil of the electric motor. 2. Two refrigerant pipes connected to the refrigeration cycle are drawn into the motor chamber, and a four-way valve included in the refrigeration cycle selects either the discharge pressure or the suction pressure in the motor chamber. A hybrid type compressor which is operated while being switched in a manner as described above, wherein an opening of the one refrigerant pipe which is a refrigerant discharge side at the time of the discharge pressure operation is disposed inside an inner diameter of a stator coil of the electric motor. The scroll compressor according to claim 1. 3. The scroll compressor according to claim 1, wherein an opening of the refrigerant discharge pipe is directed toward a rotor of the electric motor. 4. A cylindrical cover having a diameter smaller than a rotor diameter of the electric motor is provided coaxially with the rotary drive shaft on the main frame on the electric motor room side, and the refrigerant is contained in the cover. The scroll compressor according to any one of claims 1 to 3, wherein an opening of the discharge pipe is provided. 5. The scroll compressor according to claim 4, wherein a part or all of an upper balance weight provided on a rotor of the electric motor is accommodated in the cover. 6. A lower end of the cover is provided with a flange bent toward an inner diameter direction.
Or the scroll compressor according to 5. 7. A centrifugal separator made of a disk that rotates about an axis of the rotary drive shaft, the upper balance weight provided on the rotor of the electric motor. 2. The scroll compressor according to item 1. 8. A flat balance weight provided on the rotor of the electric motor, wherein the upper balance weight integrally has a disc-shaped centrifugal separation plate on the upper surface and a recess of a predetermined size on the joint surface side with the rotor. The scroll compressor according to any one of claims 1 to 6, wherein the scroll compressor is formed in a cylindrical shape. 9. The scroll compressor according to claim 8, wherein the balance weight is provided with a hole or a groove communicating with the recess. 10. The scroll compressor according to claim 8, wherein a groove communicating with the concave portion is provided on a joint surface of the rotor with the balance weight. 11. The scroll compressor according to claim 7, wherein a plurality of radial grooves are provided in a radial direction of the centrifugal separation plate of the balance weight.