JP2001065460A - Canned motor compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool a motor part, and prevent the temperature of a motor from excessively rising by providing a refrigerant circuit which is brought into contact with an outer surface of a sealed container for holding a stator, and passing a refrigerant delivered from a compression mechanism part to the refrigerant circuit. SOLUTION: A refrigerant intaked from an intake port 7 to a compression mechanism 2 is compressed, and the compressed high pressure refrigerant gas is delivered bypassing a refrigerant circuit 1 spirally wound around a sealed container shell 6. In this time, the refrigerant receives heat of a motor part stator 4 through the sealed container shell 6 when it is passed the refrigerant circuit 1. A tubular shape of the refrigerant circuit 1 which is spirally wound around the sealed container shell 6 is formed in an elliptical shape, the pipe is wound at narrow clearances so as to cover the motor part stator 4, and a contact area with the sealed container shell 6 is enlarged. It is thus possible to prevent the temperature from excessively rising by cooling the motor part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor using NH3 as a refrigerant and having a can mounted on the inner surface of the stator so that the refrigerant does not touch the stator of the motor.

[0002]

2. Description of the Related Art At present, it is said that HCFC-based refrigerant represented by R22 used in a refrigeration cycle apparatus destroys the ozone layer due to the stability of its physical properties. In recent years,
HFC-based refrigerants have begun to be used as alternative refrigerants to HCFC-based refrigerants, but these HFC-based refrigerants have the property of promoting the global warming phenomenon. Therefore, recently, the use of a natural refrigerant that does not significantly affect the destruction of the ozone layer and the global warming phenomenon has begun to be studied. Typical examples of natural refrigerants include propane, CO2, and NH3.Propane is extremely flammable, and CO2 has a high pressure, which is dangerous and has low performance. Not used until very often. NH3, on the other hand, has very high performance,
It has been used for large-scale air conditioning such as ice making for more than 100 years, and has been attracting attention as a refrigerant that replaces CFCs. However, since NH3 is corrosive to copper,
When a refrigeration cycle is configured, the stator winding of the compressor motor must have a structure that does not contact NH3.
In such a case, the motor section is not cooled, so that the temperature may excessively increase, which may cause a decrease in motor efficiency or a decrease in reliability. Therefore, the motor section needs to be cooled. Therefore, as a method for cooling the motor unit, it has been proposed to circulate the refrigerating machine oil around the shell using a circulation pump (for example, JP-A-7-103580).

[0003]

However, in the case where the above-mentioned conventional motor section is cooled with refrigeration oil, a circulating pump and a cooling pipe are required, the number of parts is increased, the compressor is enlarged, and the structure is increased. Due to the complexity, it has a problem that it is not practical as a home air conditioner.

Therefore, the present invention provides a can motor compressor that cools a motor without providing a complicated cooling circuit, prevents an excessive rise in temperature of the motor, and enables safe operation. The purpose is to:

Another object of the present invention is to provide a can motor compressor which is simple and compact by wrapping a refrigerant circuit around an outer surface of a closed vessel to cool a motor section.

Another object of the present invention is to provide a can motor compressor in which the motor section is more efficiently cooled by increasing the contact area between the refrigerant circuit and the outer surface of the closed vessel.

[0007]

According to a first aspect of the present invention, there is provided a can motor compressor according to the present invention, wherein a compression mechanism section, a motor section driving the compression mechanism section and having a rotor and a stator; A compressor provided with a can on the inner surface thereof, comprising a refrigerant circuit in contact with an outer surface of a sealed container holding the stator, wherein the refrigerant discharged from the compression mechanism passes through the refrigerant circuit. I do.

According to a second aspect of the present invention, there is provided a can motor compressor according to the first aspect, wherein the refrigerant circuit is spirally wound around the outer surface of the closed container.

According to a third aspect of the present invention, in the can motor compressor of the present invention, a cylindrical enclosure is attached to an outer surface of the closed container, and a refrigerant circuit is provided between the outer surface of the closed container and the enclosure. .

[0010] A fourth aspect of the present invention is a can motor compressor, wherein NH3 is used as a refrigerant.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A can motor compressor according to a first embodiment of the present invention has a refrigerant circuit in contact with the outer surface of an airtight container holding a stator. Pass through. As a result, the motor portion is cooled without providing a complicated cooling circuit, and an excessive rise in temperature can be prevented, so that the refrigeration cycle apparatus can safely operate.

A can motor compressor according to a second embodiment of the present invention includes a refrigerant circuit spirally wound around an outer surface of a sealed container holding a stator, and a refrigerant discharged from a compression mechanism is a refrigerant circuit. It passes through the circuit.
As a result, the motor section can be cooled with a simple and compact structure, and the refrigeration cycle apparatus can reliably operate safely.

[0013] Further, in a can motor compressor according to a third embodiment of the present invention, a cylindrical enclosure is attached to an outer surface of a sealed container holding a stator, and a refrigerant circuit is provided between the outer surface of the sealed container and the enclosure. The refrigerant discharged from the compression mechanism passes through the refrigerant circuit. As a result, the contact area with the outer surface of the sealed container becomes large, so that the motor unit can be further cooled, the decrease in motor efficiency can be suppressed, and the refrigeration cycle apparatus can operate safely.

A can motor compressor according to a fourth embodiment of the present invention uses NH 3 as a refrigerant in the can motor compressor according to the first to third embodiments. Because of this, since NH3 is corrosive to copper, it is possible to adopt a structure in which the compressor motor and the stator winding do not come into contact with each other, and the motor is cooled,
Since the excessive temperature rise can be prevented, the refrigeration cycle apparatus can safely operate.

[0015]

An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of a compressor according to this embodiment.

1 is a refrigerant circuit, 2 is a compression mechanism, 3 is a motor rotor, 4 is a motor stator, 5 is a can, 6 is a sealed container shell, 7 is a suction port, 8 is a discharge port, and 9 is This is the winding outlet.

As shown in FIG. 3, the can 5 has a cylindrical member inserted between the motor rotor and the motor stator so that the stator does not come into contact with the refrigerant, and a donut-shaped member at the top and bottom. It is fixed or welded with an O-ring or the like. The stator winding is connected to a compressor drive circuit via a winding outlet 9.

Here, the flow of the refrigerant in the compressor will be described. First, the refrigerant sucked into the compression mechanism 2 from the suction port 7 is compressed, and the compressed high-pressure refrigerant gas is discharged through the refrigerant circuit 1 spirally wound around the closed casing shell 6. At this time, the refrigerant is in the refrigerant circuit 1
The heat of the motor stator 4 is passed through the
, Preventing an excessive rise in the temperature of the motor. The pipe shape of the spirally wound cooling circuit 1 is desirably elliptical, the contact area with the closed vessel shell 6 is increased, and the cooling efficiency is improved. Since NH3 has a small pressure loss, the tube is wound at a small interval so as to cover the motor unit stator 4, so that the contact area with the closed vessel shell 6 is increased.

(Embodiment 2) FIG. 2 is a sectional view of a compressor in this embodiment. Components having the same configuration as in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. 10 is a cylindrical enclosure, and 11 is a refrigerant circuit.

The second embodiment differs from the first embodiment in that a cylindrical enclosure 10 is mounted on the outer surface of a closed vessel shell 6 instead of the refrigerant circuit 1, and a refrigerant circuit is provided between the outer surface of the closed vessel and the enclosure. The feature is 11. At this time, the compression mechanism
As the refrigerant discharged from 2 passes through the refrigerant circuit 11,
The contact area with the closed container shell 6 is further increased, and the refrigerant can receive the heat of the motor unit stator 4 via the closed container shell 6. By using a cylindrical enclosure having good heat conductivity, the cooling efficiency is increased.

[0022]

As described above, according to the present invention, in a can-motor compressor using NH3, a refrigerant circuit is provided on the outer surface of a closed vessel to cool a motor section without providing a complicated cooling circuit. To prevent excessive temperature rise,
A reduction in motor efficiency can be suppressed and the operation of the compressor can be performed safely.

[Brief description of the drawings]

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

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

FIG. 3 is a perspective view of a can according to the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Refrigerant circuit 2 Compression mechanism part 3 Motor part rotor 4 Motor part stator 5 Can 6 Airtight container shell 7 Suction port 8 Discharge port 9 Winding take-out port 10 Cylindrical enclosure

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kiyoshi Sawai 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Terms (reference) 3H003 AB04 AC03 BE09 CF04 3H029 AA13 AA21 AB03 BB12 CC25 CC46 5H605 AA01 BB07 BB17 CC01 DD09 DD13

Claims (4)

[Claims] 1. A compressor comprising: a compression mechanism, a motor for driving the compression mechanism, and having a rotor and a stator; and a compressor having a can on an inner surface of the stator, the compressor holding the stator. A can motor compressor comprising: a refrigerant circuit in contact with an outer surface of a sealed container; and refrigerant discharged from the compression mechanism passes through the refrigerant circuit. 2. The can motor compressor according to claim 1, wherein the refrigerant circuit is spirally wound around an outer surface of the closed container. 3. The can motor according to claim 1, wherein the refrigerant circuit has a cylindrical enclosure attached to an outer surface of the closed container, and a refrigerant circuit is provided between the outer surface of the closed container and the enclosure. Compressor. 4. The can motor compressor according to claim 1, wherein NH 3 is used as a refrigerant.