JP2003155979A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor constituted by arranging a discharge pipe in a lower part of an electric motor to let compressed refrigerant pass through the electric motor and discharge it to the outside of a sealed vessel in order to cool the electric motor effectively and improve the reliability. SOLUTION: This hermetic compressor is provided with a compression part 2 compressing refrigerants arranged in upper and lower parts in the sealed vessel 1, the electric motor 3 driving the compression part 2 and having a stator 3a and a rotor 3b, a shaft 7 transmitting a rotation force of the electric motor 3 to the compression part 2, a main frame 8 supporting a main shaft at a tip of the shaft 7, and a subframe 14 supporting a lower end of the shaft 7. A suction pipe 9 for absorbing refrigerant is connected with an inlet chamber 2a of the compression part 2. On the other hand, the discharge pipe 10 discharging the refrigerant compressed in the compression part 2 to the outside of the sealed vessel 1 is connected with an electric motor chamber 3c storing the electric motor 3, and one end of the discharge pipe 10 faces the lower part of the electric motor 3.

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 in an air conditioner or the like, and more specifically, a discharge pipe is arranged below a motor, and a compressed refrigerant is passed through the motor to seal the compressor. The present invention relates to an arrangement and a structure of a discharge pipe that discharges outside a container and can effectively cool an electric motor.

[0002]

2. Description of the Related Art For example, a conventional hermetic compressor is shown in FIG. Here, a vertical scroll type compressor in which a compression section is arranged in the upper part and an electric motor is arranged in the lower part will be described as an example. In FIG. 5, an electric motor 3 having a stator 3b fixed inside the closed container 1 and a rotor 3a driven and rotated by the stator 3b in the closed container 1, and a driving force of the electric motor 3 And a compression unit 2 driven by.

The compression section 2 has a fixed scroll 4 in which a spiral wrap 4b is erected on the inner surface of an end plate 4a, and a plurality of compression chambers 5 in which the fixed scroll 4 and the wrap 6b on the inner surface of the end plate 6a are meshed with each other. Shaft for transmitting the rotational force of the electric motor 3 to the orbiting scroll 6 and the orbiting bearing formed on the boss portion 6c on the back surface of the orbiting scroll 6 for transmitting the rotational force of the electric motor 3 to the orbiting scroll 6. 7 and a main frame 8 having a main bearing 8a that supports a main shaft 7c provided below the revolving shaft 7a of the shaft 7.

A suction pipe 9 for sucking a refrigerant is connected to the suction chamber 2a of the compression section 2 and a motor chamber 3c for accommodating the electric motor 3 is provided between the electric motor 3 and the compression section 2. A discharge pipe 10 'for discharging the refrigerant compressed in the compression section 2 to the outside of the closed container 1 is connected, and the closed type compressor has a high internal pressure type.

In the above structure, the refrigerant gas compressed by the compression section 2 flows from the discharge port (not shown) to the upper space 3c1 of the electric motor chamber 3c through the communication passage, and the rotor 3a on the upper side of the electric motor 3 and the fixed portion. The child 3b is cooled and discharged from the discharge pipe 10 'to the outside of the closed container 1. However, it is difficult for gas to circulate on the lower side of the electric motor 3, so that heat is dissipated by heat conduction, or lubricating oil flowing from a minute space between the rotor 3a and the stator 3b and between the stator 3b and the closed container 1 is used. It was cooled with a refrigerant. However, in this case, the lower side of the electric motor 3, particularly the lower winding, has poor heat dissipation and becomes extremely hot, which may cause dielectric breakdown, and the space for separating the refrigerating machine oil contained in the refrigerant gas decreases. May increase the amount of oil discharged.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, in which a discharge pipe is provided at the bottom of an electric motor,
An object of the present invention is to provide a hermetic compressor that allows a compressed refrigerant to pass through an electric motor and be discharged to the outside of a hermetically sealed container to effectively cool the electric motor and to improve reliability.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is a compressor for compressing the refrigerant disposed above and below in a closed container and a stator for driving the compressor. And an electric motor having a rotor, a shaft for transmitting the rotational force of the electric motor to the compression unit, a main frame for supporting a main shaft provided at the tip of the shaft, and a sub-frame for supporting the lower end of the shaft. A suction pipe for sucking a refrigerant is connected to the suction chamber of the compression unit,
In a hermetic compressor in which a discharge pipe that discharges the refrigerant compressed in the compression unit to the outside of the closed container is connected to an electric motor chamber that houses the electric motor, one end opening of the discharge pipe is provided in a lower portion of the electric motor. It is configured to face the other end and to project the other end to the outside from the lower side wall of the closed container.

Further, one end of the discharge pipe is bent to the lower side of the electric motor.

Further, one end of the discharge pipe is made to face the lower portion of the rotor of the electric motor.

Further, one end of the discharge pipe is made to face the lower winding of the stator of the electric motor.

Further, the horizontal pipe of the discharge pipe is arranged below the sub-frame, and the vertical pipe is inserted into an insertion hole provided in the sub-frame.

The discharge pipe is provided between the electric motor and the sub-frame, one end of which faces the shaft, and the other end of which is formed in a straight line projecting outward from a lower side wall of the hermetic container. It is configured as follows.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail as examples based on the drawings. FIG. 1 is a vertical sectional view of a hermetic compressor showing a first embodiment of the present invention,
FIG. 2 is an enlarged cross-sectional view of a main part of the present invention. Here, an internal high pressure scroll type compressor will be described as an example. In the figure, an electric motor 3 having a stator 3b fixed inside the closed container 1 and a rotor 3a driven and rotated by the stator 3b in the closed container 1, and a driving force of the electric motor 3 The compression unit 2 to be driven is provided.

The scroll type compressor has a fixed scroll 4 in which a spiral wrap 4b is erected on the inner surface of an end plate 4a.
The fixed scroll 4 and the wrap 6b on the inner surface of the end plate 6a mesh with each other to form a plurality of compression chambers 5, and the orbiting bearing formed on the boss portion 6c on the back of the orbiting scroll 6 The rotary shaft 7a is inserted, and the electric motor 3 is inserted.
7 for transmitting the rotational force of the orbit to the orbiting scroll 6
And a main frame 8 supporting the main shaft 7b of the shaft 7.
And a sub-frame 14 that supports the lower end of the shaft 7.
And an oil pump 15 for supplying lubricating oil from the lower end of the shaft 7 to the sliding portion of the compression portion 2 from the oil sump 16 at the bottom of the closed container 1 through the lubricating oil feed passage 7c.

Further, the suction pipe 9 for sucking the refrigerant is connected to the suction chamber 2a of the compression section 2, and the refrigerant compressed by the compression section 2 is introduced into the lower space 3c2 of the electric motor room 3c for accommodating the electric motor 3. A discharge pipe 10 for discharging to the outside of the closed container 1 is connected, and compressed refrigerant is discharged from a discharge port 11 to a discharge chamber 12 and flows into a motor chamber 3c via a communication passage 13 to form a hermetic compressor with an internal high pressure type. The discharge pipe 10 discharges the gas to the outside.

The discharge pipe 10 is composed of a vertical pipe 10a having one end facing the lower portion of the rotor 3a of the electric motor 3 and another end protruding horizontally from the lower side wall of the hermetically sealed container 1 to form a horizontal pipe 10b. The vertical tube 10a is formed in an L-shape, or as shown in FIG. 2, in a slanted obtuse inverted inverted V-shape so as to facilitate the assembly.

Further, the horizontal pipe 10b of the discharge pipe 10 is
By disposing the vertical pipe 10a in the lower portion of the sub-frame 14 and inserting the vertical pipe 10a into the insertion hole 14a provided in the sub-frame 14, the discharge pipe 10 and the closed frame are closed. It can be firmly fixed to the lower side wall of 1.

In the above structure, the refrigerant compressed in the compression section 2 is discharged from the discharge port 11 into the discharge chamber 12, and the communication passage 13
Flow into the upper space 3c1 of the electric motor room 3c through which the refrigerant gas and the lubricating oil 16a are separated, and the electric motor 3
1 passes through the gap between the stator 3b and the rotor 3a, cools the electric motor 3 and flows into the lower space 3c2 of the electric motor chamber 3c (broken line arrow in FIG. 1). Lubricating oil flowing from the upper part of the electric motor 3
Since the rotor 3a is rotating during operation, the rotor 16a is scattered to the side of the stator 3b by centrifugal force, so that the rotor 16a
Since it is difficult to collect within the range of the diameter of 3a, the discharge pipe 10
It is difficult for the oil to be discharged to the outside, and it is possible to prevent a decrease in the amount of oil discharged.

As shown in FIG. 2, the lubricating oil under the compressor is in operation.
The flow condition of 16a will be described. The lubricating oil 16a receives a slight centrifugal force by the rotating shaft 7, and the oil surface a of the oil 16
Has a parabolic shape as indicated by the dashed line. Therefore, the oil surface a and the opening (refrigerant outlet) of the discharge pipe 10 are separated from each other toward the inner peripheral portion, and the amount of oil discharged is reduced. Further, the lubricating oil 16a near the shaft 7 is scattered by the centrifugal force to the outer peripheral portion like an elliptical shape b as shown by the broken line, so that the possibility of entering the opening of the discharge pipe 10 is reduced.

FIG. 3 shows a second embodiment of the present invention, in which one end of the vertical pipe 10a of the discharge pipe 10 is connected to the stator of the electric motor 3.
It is configured to face the lower winding 3d of 3b. In this case, although the amount of oil discharged is slightly disadvantageous, the lower winding 3d, which has poor heat dissipation and tends to reach a high temperature, is directly cooled, which is effective in cooling the entire electric motor 3, and the material cost is low. Easy to assemble.

FIG. 4 shows a third embodiment according to the present invention, in which the discharge pipe 10 is provided between the electric motor 3 and the sub-frame 14, and one end of the discharge pipe 10 faces the shaft 7.
The other end is formed in a linear shape protruding outward from the lower side wall of the closed container 1. In this case, the material cost is low and the assembly is easy.

As described above, one end of the discharge pipe 10 is made to face the lower part of the electric motor 3, and the other end is projected to the outside from the lower side wall of the hermetically sealed container 1.
By discharging the compressed refrigerant through the electric motor 3 to the outside of the hermetically sealed container 1, the electric motor is effectively cooled, insulation breakdown of the electric motor 3 is prevented, and reliability is improved. Becomes

[0023]

As described above, in the present invention, the discharge pipe is arranged in the lower part of the electric motor, and the compressed refrigerant is passed through the electric motor and discharged to the outside of the hermetically sealed container to effectively cool the electric motor. Thus, the hermetic compressor can prevent the electric breakdown of the electric motor 3 and improve the reliability.

[Brief description of drawings]

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

FIG. 2 is an enlarged sectional view of an essential part of the hermetic compressor according to the present invention.

FIG. 3 is an enlarged cross-sectional view of an essential part showing a second embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of a hermetic compressor showing a third embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a conventional hermetic compressor.

[Explanation of symbols]

1 closed container 2 Compressor 3 electric motor 3a rotor 3b stator 3c electric motor room 3d winding 4 fixed scroll 5 compression chamber 6 orbiting scroll 6c Boss 7 shaft 7a swivel axis 7b spindle 7c Lubricating oil passage 8 main frames 9 Inhalation tube 10 Discharge pipe 10a vertical tube 10b horizontal pipe 11 Discharge port 12 Discharge chamber 13 passages 14 subframe 14a insertion hole 15 oil pump 16 oil sump 16a lubricating oil

Claims (6)

[Claims] 1. An electric motor having a compression section arranged above and below in a closed container for compressing a refrigerant, a stator for driving the compression section and a rotor, and a rotational force of the electric motor transmitted to the compression section. A shaft, a main frame that supports a main shaft provided at the tip of the shaft, and a subframe that supports the lower end of the shaft, and connect a suction pipe for sucking refrigerant to the suction chamber of the compression unit. In a hermetic compressor in which a discharge pipe for discharging the refrigerant compressed in the compression section to the outside of the hermetic container is connected to an electric motor chamber accommodating the electric motor, one end of the discharge pipe faces a lower portion of the electric motor. A hermetic compressor characterized by the fact that it does not come out. 2. The hermetic compressor according to claim 1, wherein one end of the discharge pipe is bent toward a lower side of the electric motor. 3. The hermetic compressor according to claim 1, wherein one end of the discharge pipe faces a lower portion of a rotor of the electric motor. 4. The one end of the discharge pipe is made to face the lower winding of the stator of the electric motor.
Or the hermetic compressor according to 2. 5. The horizontal pipe of the discharge pipe is arranged in a lower portion of the sub-frame, and the vertical pipe is inserted into an insertion hole provided in the sub-frame. The hermetic compressor according to any one of 2, 3, and 4. 6. The discharge pipe is provided between the electric motor and the sub-frame, one end of which is exposed to the shaft, and the other end of which is formed in a straight line protruding outward from a lower side wall of the hermetic container. 1. The method according to claim 1, wherein
The hermetic compressor described.