JP2002364566A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor capable of precluding dielectric breakdown by forming a communication hole penetrating a rotor in its axial direction and circulating a gas in a motor chamber through utilization of the difference in the centrifugal force due to the rotation of a shaft so that a motor is cooled effectively. SOLUTION: The hermetic compressor includes a sealed vessel 1 furnished internally with a motor part 3 consisting of a stator 3b, a rotor 3a driven by the stator 3b and the shaft 7 whereto the rotor 3a is attached and a compression part 2 driven by the driving force of the motor part 3, in which a suction pipe 9 is connected with the suction chamber 2a of the compression part 2 for sucking in the refrigerant while a discharge pipe 10 to discharge the compressed refrigerant to outside the vessel 1 is connected with the motor chamber 3c in its part between the motor part 3 and compression part 2, wherein the rotor 3a is furnished with the communication hole 11 to generate a communication between the compression part side space 3c1 and counter-compression part side space 3c2 of the motor chamber 3c, and part of the discharged refrigerant gas in the compression part side space 3c1 is supplied to the counter-compression part side space 3c2 by the centrifugal force generated with rotation of the rotor 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used for an air conditioner or the like, and more particularly, to circulate gas in an electric motor room by utilizing a difference in centrifugal force due to rotation of a shaft. The present invention relates to a structure of a refrigerant gas passage for effective cooling.

[0002]

2. Description of the Related Art There is a conventional hermetic compressor as shown in FIG. Here, an internal high pressure scroll compressor will be described as an example. In FIG.
Inside, a motor unit 3 having a stator 3b fixed inside the sealed container 1, a rotor 3a driven and rotated by the stator 3b, and a compression driven by a driving force of the motor unit 3 Section 2 is provided.

The compression section 2 includes a fixed scroll 4 having a spiral wrap 4b erected on the inner surface of an end plate 4a, and a plurality of compression chambers 5 which mesh with the fixed scroll 4 and the wrap 6b on the inner surface of the end plate 6a. The orbiting shaft 7a at the tip is inserted into the orbiting scroll 6 that forms the rotation scroll 6 and the orbiting bearing formed on the boss 6c on the back surface of the orbiting scroll 6, and the rotational force of the electric motor unit 3 is transmitted to the orbiting scroll 6. It is mainly composed of a shaft 7 and a main frame 8 having a main bearing 8a for supporting a main shaft 7c provided below a flange 7b below the turning shaft 7a of the shaft 7.

A suction pipe 9 for sucking refrigerant is connected to a suction chamber 2a of the compression section 2, and a suction pipe 9 for accommodating the motor section 3 is provided between the motor section 3 and the compression section 2. The refrigerant compressed by the compression unit 2 is
A discharge pipe 10 for discharging to the outside is connected, and the hermetic compressor is of an internal high-pressure type.

In the above configuration, the refrigerant gas compressed by the compression section 2 flows from the discharge port (not shown) to the upper space 3c1 of the motor room 3c via the communication path, and the rotor 3a and the upper rotor 3a of the motor section 3 The stator 3b is cooled and discharged from the discharge pipe 10 to the outside of the closed container 1. However, the lower side of the motor unit 3 dissipates heat by heat conduction, or the rotor 3a and the stator 3b
It has been cooled by lubricating oil or refrigerant flowing from the minute space between the stator 3b and the sealed container 1. However, in this case, the temperature of the lower side of the motor unit 3 becomes extremely high, and in the worst case, there is a possibility of causing dielectric breakdown.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a rotor provided with a communication hole penetrating in the axial direction and utilizing a difference in centrifugal force due to rotation of a shaft.
The gas in the motor room is circulated to effectively cool the motor,
An object of the present invention is to provide a hermetic compressor capable of preventing dielectric breakdown.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises a stator fixed inside an airtight container, a rotor driven by the stator and rotating, An electric motor unit having a shaft to which a child is attached, and a compression unit driven via the shaft by a driving force of the electric motor unit are disposed in the closed container, and a refrigerant is supplied to a suction chamber of the compression unit. A suction pipe for suction is connected, and a discharge pipe for discharging the refrigerant compressed by the compression section to the outside of the closed container is connected between the electric motor section and the compression section of the motor room accommodating the motor section. In the hermetic compressor, the rotor is provided with a communication hole that communicates the compression section side space and the non-compression section side space of the electric motor chamber in the axial direction, and the refrigerant gas discharged from the compression section side space is provided. Part of the rotor The centrifugal force generated by, and has a configuration supplied to the counter-compression unit side space.

An electric motor section having a stator fixed inside the sealed container, a rotor driven and rotated by the stator, and a shaft to which the rotor is attached;
A compression section driven through the shaft by the driving force of the electric motor section; and a discharge chamber in which compressed refrigerant is discharged from the compression section inside the closed container, and the electric motor section. And a motor chamber for accommodating the compressor section, and a discharge pipe for discharging the compressed refrigerant to the outside of the closed container is connected to the discharge chamber while the motor section of the motor chamber and the compression section are connected to each other. In a hermetic compressor in which a suction pipe for sucking a refrigerant is connected to a suction chamber of the compression section, the rotor is provided with the compression section-side space and the non-compression section-side space of the electric motor chamber. A communication hole communicating in the direction is provided, and a part of the suctioned refrigerant gas in the compression section space is supplied to the non-compression section side space by centrifugal force generated by rotation of the rotor.

An opening of the communication hole on the compression section side is provided near the shaft side, and an opening on the anti-compression section side is provided near the stator side.

[0010] Further, the communication hole is provided in a crank shape from the shaft side to the stator side.

Further, the communication hole is gently inclined from the shaft side to the stator side.

[0012] Further, a plurality of the communication holes are provided.

[0013] A disk is provided near the rotor in the space on the side opposite to the compression section, the disk being supported by the shaft.

The diameter of the disk is substantially the same as the diameter of the rotor.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as examples. FIG. 1 is a longitudinal sectional view of the hermetic compressor according to the present invention. Here, an internal high pressure scroll compressor will be described as an example. FIG.
, A motor unit 3 having a stator 3b fixed inside the closed container 1, a rotor 3a driven and rotated by the stator 3b, and a driving force of the motor unit 3 And a compression unit 2 driven by the compressor.

The compression section 2 includes a fixed scroll 4 having a spiral wrap 4b erected on the inner surface of an end plate 4a, and a plurality of compression chambers 5 which mesh with the fixed scroll 4 and the wrap 6b on the inner surface of the end plate 6a. The orbiting shaft 7a at the tip is inserted into the orbiting scroll 6 that forms the rotation scroll 6 and the orbiting bearing formed on the boss 6c on the back surface of the orbiting scroll 6, and the rotational force of the electric motor unit 3 is transmitted to the orbiting scroll 6. It is mainly composed of a shaft 7 and a main frame 8 having a main bearing 8a for supporting a main shaft 7c provided below a flange 7b below the turning shaft 7a of the shaft 7.

Further, a suction pipe 9 for sucking refrigerant is connected to the suction chamber 2a of the compression section 2, and between the motor section 3 and the compression section 2 of the motor chamber 3c containing the motor section 3. The refrigerant compressed by the compression unit 2 is
A discharge pipe 10 for discharging to the outside is connected, and the hermetic compressor is configured to be an internal high pressure type.

The rotor 3a is provided with a plurality of communication holes 11 for axially communicating the compression section 2 side space 3c1 and the non-compression section side space 3c2 of the motor chamber 3c, and the compression section 2 side space 3c1.
A part of the discharged refrigerant gas is supplied to the non-compression section side space 3c2 by a difference in centrifugal force generated by the rotation of the rotor 3a.

Further, a space of the communication hole 11 on the side of the compression section 2 is provided.
An opening 11a of 3c1 is provided near the shaft 7 side, and an opening 11b of the anti-compression section side space 3c2 is provided near the stator 3b side, and the communication hole 11 is provided from the shaft 7 side. A part of the refrigerant gas discharged from the compression section 2 side space 3c1 is formed by a difference in centrifugal force generated by the rotation of the rotor 3a by adopting a configuration formed in a crank shape toward the stator 3b side. The refrigerant gas is supplied to the non-compression section side space 3c2 through the communication hole 11, and as a result, the refrigerant gas also flows below the electric motor section 3, whereby both the rotor 3a and the stator 3b are effectively cooled, and the electric motor section 3 can be prevented.

FIG. 2 is a longitudinal sectional view of a hermetic compressor according to the present invention, taking a low-pressure internal scroll compressor as an example. In the figure, an electric motor unit 3 and a compression unit 2
And a discharge chamber 12 in which the compressed refrigerant is discharged from the compression section 2 and a motor chamber 3c containing the motor section 3 are partitioned by the compression section 2 inside the closed container 1 and the discharge section 12 is provided. A discharge pipe 10 ′ for discharging the compressed refrigerant to the outside of the closed vessel 1 is connected to the chamber 12, and a suction chamber of the compression section 2 is provided between the motor section 3 and the compression section 2 of the motor chamber 3 c. A suction pipe 9 'for sucking a refrigerant is connected to 2a, and the hermetic compressor is configured as an internal low pressure type.

The rotor 3a is provided with a plurality of communication holes 11 for axially communicating the compression section 2 side space 3c1 and the non-compression section side space 3c2 of the electric motor chamber 3c, and the compression section 2 side space 3c1.
A part of the suctioned refrigerant gas is supplied to the non-compression section side space 3c2 by centrifugal force generated by the rotation of the rotor 3a. Thus, similarly to the above, the refrigerant gas also flows below the electric motor unit 3, and the rotor 3a and the stator 3b are effectively cooled, so that the electric breakdown of the electric motor unit 3 can be prevented.

FIG. 3 shows another embodiment of the communication hole 11 according to the present invention. The communication hole 11 is gradually directed from the opening 11a on the shaft 7 side to the opening 11b on the stator 3b side. As in the case of FIG. 1, a part of the refrigerant gas discharged from the compression section 2 side space 3c1 passes through the communication hole 11 by centrifugal force generated by the rotation of the rotor 3a. As a result, the refrigerant gas is supplied to the non-compression section side space 3c2. As a result, the refrigerant gas also flows below the electric motor section 3, and both the rotor 3a and the stator 3b are effectively cooled. Can be prevented.

FIG. 4 shows still another embodiment of the present invention, in which a disk 13 is provided near the rotor 3a in the space 3c2 on the side of the non-compression section, and the disk 13 is supported by the shaft 7. 13, the diameter of the rotor 3a is substantially the same as the diameter of the rotor 3a, and the gap between the rotor 3a and the disk 13 is
By adopting a configuration that is 1/10 or less of the diameter of 3a, the refrigerant gas between the rotor 3a and the disk 13 flies to the outer periphery by centrifugal force due to the rotation of the rotor 3a, and the pressure at the center decreases. I do. When the pressure at the center decreases, similar to the above embodiment,
Part of the refrigerant gas discharged from the compression section 2 side space 3c1 is supplied to the non-compression section side space 3c2 through the communication hole 11,
As a result, the refrigerant gas also flows below the electric motor unit 3,
Both the rotor 3a and the stator 3b are effectively cooled,
The insulation breakdown of the motor unit 3 can be prevented.

As described above, the rotor 3a has:
A plurality of communication holes 11 for axially communicating the compression section 2 side space 3c1 and the non-compression section side space 3c2 of the motor room 3c;
By supplying a part of the refrigerant gas discharged from the compression section 2 side space 3c1 to the anti-compression section side space 3c2 by a difference in centrifugal force generated by the rotation of the rotor 3a, the refrigerant gas is It also flows below the motor section 3 and the rotor 3a
And the stator 3b are effectively cooled, so that the hermetic compressor can prevent the electric motor unit 3 from dielectric breakdown.

[0025]

As described above, according to the present invention, the rotor is provided with a plurality of communication holes which axially communicate the compression section side space and the non-compression section side space of the motor room, and the compression section side space is provided. With a configuration in which a part of the discharged refrigerant gas is supplied to the non-compression unit side space due to a difference in centrifugal force generated by rotation of the rotor, the refrigerant gas also flows below the electric motor unit, and the rotor and the stator Both are effectively cooled, resulting in a hermetic compressor that can prevent dielectric breakdown of the motor section.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of an internal high-pressure hermetic compressor showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of an internal low-pressure hermetic compressor showing an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a hermetic compressor showing another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a hermetic compressor showing still another embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a hermetic compressor showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression part 3 Electric motor 3a Rotor 3b Stator 3c Motor room 4 Fixed scroll 5 Compression chamber 6 Orbiting scroll 6c Boss part 7 Shaft 7a Orbiting shaft 7b Flange 7c Main shaft 8 Main frame 9 Suction pipe 10 Discharge pipe 11 Communication hole 13 disk

Claims (8)

[Claims] 1. A stator fixed inside an airtight container,
An electric motor unit having a rotor driven and rotated by the stator, a shaft to which the rotor is attached, and a compression unit driven via the shaft by a driving force of the electric motor unit are provided in the closed container. And a suction pipe for sucking refrigerant is connected to a suction chamber of the compression section, and the compression section compresses the air in the motor chamber accommodating the motor section, between the motor section and the compression section. A hermetic compressor connected to a discharge pipe that discharges the discharged refrigerant to the outside of the hermetic container, wherein the rotor communicates in the axial direction with the compression section side space and the non-compression section side space of the electric motor room. A hermetic compressor characterized in that a communication hole is provided and a part of the refrigerant gas discharged from the compression section side space is supplied to the non-compression section side space by centrifugal force generated by rotation of the rotor. . 2. A stator fixed inside an airtight container,
An electric motor unit having a rotor driven and rotated by the stator, a shaft to which the rotor is attached, and a compression unit driven via the shaft by a driving force of the electric motor unit are provided in the closed container. And a discharge chamber in which the compressed refrigerant is discharged from the compression section in the closed container, and a motor chamber that houses the motor section is partitioned by the compression section, and the refrigerant compressed in the discharge chamber is A hermetic type in which a discharge pipe for discharging the refrigerant to the outside of the hermetic container is connected, and a suction pipe for sucking a refrigerant into a suction chamber of the compression section is connected between the motor section and the compression section of the motor chamber. In the compressor, the rotor is provided with a communication hole that communicates the compression section side space and the non-compression section side space of the electric motor chamber in the axial direction, and a part of the suction refrigerant gas in the compression section side space is provided. By the rotation of the rotor A hermetic compressor characterized in that the centrifugal force is generated to supply the anti-compression section side space. 3. An opening on the compression section side of the communication hole,
The hermetic compressor according to claim 1, wherein the hermetic compressor is provided near the shaft, and an opening on the anti-compression portion side is provided near the stator. 4. The hermetic compressor according to claim 3, wherein the communication hole is provided in a crank shape from the shaft side to the stator side. 5. The hermetic compressor according to claim 3, wherein the communication hole is gently inclined from the shaft side to the stator side. 6. The hermetic compressor according to claim 1, wherein a plurality of said communication holes are provided. 7. The hermetic compressor according to claim 1, wherein a disk that is pivotally supported by the shaft is provided near the rotor in the non-compression portion side space. 8. The hermetic compressor according to claim 7, wherein the diameter of the disk is substantially equal to the diameter of the rotor.