JPH11264388A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling performance of an electric motor in a scroll compressor having a suction pipe in the same direction as a discharge pipe. SOLUTION: In this scroll compressor, a first communication hole 4c and a second communication hole 4d for communicating a suction pipe 16 with a main frame side and to be communicated with each other in the approximately intermediate position in a fixed scroll 4 are formed on the outer periphery of the fixed scroll 4, and a third communication hole 7a to be communicated with the second communication hole 4b and for communicating the stationary scroll 4 side with a motor chamber 1a on the electric motor 3 side is formed on the outer periphery of a main frame 7. Moreover, fourth communication holes 7b for communicating the motor chamber 1a with suction holes 5d to be communicated with a suction port on a turning scroll 5 side are formed in the intermediate parts of the main frame 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a cooling structure for a motor of a scroll compressor having a suction pipe in the same direction as a discharge pipe.

[0002]

2. Description of the Related Art FIG. 4 is a longitudinal sectional view showing an example of a conventional scroll compressor. A conventional scroll compressor will be described with reference to the drawings. First, the electric motor 3 is arranged in the compression unit 2 and the motor chamber 1 a in the sealed container 1. The compression section 2 mainly includes a fixed scroll 4, an orbiting scroll 5, an Oldham ring 13 of a rotation preventing device, a shaft 11, a crankshaft 8, a main frame 7, and an auxiliary bearing 10.

[0003] The compression unit 2 is composed of a fixed scroll 4 having a spiral wrap 4b on a head plate 4a and a head plate 5a.
The orbiting scroll 5 having the same shape of the wrap 5b and meshing with the fixed scroll 4 to form a plurality of compression chambers 9 is provided. Further, a shaft 11 that supports the orbiting drive shaft 5c of the orbiting scroll 5 and forms a crankshaft 8 at the lower end for orbital driving, a main frame 7 that supports the crankshaft 8 and a bottom surface of the fixed scroll 4 A discharge port 14 communicating with the central compression chamber 9 formed at the center is provided. In this configuration, when the shaft 11 is rotated by the rotation of the motor 3, the orbiting scroll 5 is not rotated by the Oldham ring 13 and the fixed scroll 4 is not rotated.
And the compression chamber 9 formed by the engagement of the fixed scroll 4 and the orbiting scroll 5 sequentially moves from the outer peripheral portion to the central portion.

[0004] As a result, the volume of the taken-in refrigerant gas is reduced and a compressing action occurs, and the compressed gas of the refrigerant communicates with the discharge port 14 from the discharge port 14 provided at the center portion, and a part of the compressed gas flows into another discharge port. Through a bypass port 14a communicating with the compression chamber 9,
It is led to a discharge chamber 15 provided on one side of the sealed container 1. Further, the compressed gas of the refrigerant is guided to the outside through the discharge chamber 15 and the discharge pipe 17.

In this case, since the suction pipe 16 is disposed so as to communicate with the motor chamber 1a with the compression section 2 interposed therebetween, the electric motor 3 can be easily cooled by low-temperature refrigerant gas. . However, through the discharge chamber 15 and the sealed container 1 in the same direction as the discharge pipe 17,
In the case of a structure provided with the suction pipe 16 that communicates with the refrigerant gas 8 from outside, there has been a problem that the cooling of the electric motor 3 may be difficult to be performed by the refrigerant gas sucked from outside.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a scroll compressor having a suction compressor provided in the same direction as a discharge pipe and having improved cooling performance of an electric motor. The purpose is to provide a machine.

[0007]

In order to achieve the above object, a compressor and a motor are arranged in a motor chamber in a sealed container, and the compressor is provided with a fixed scroll having a spiral wrap on a head plate. A revolving scroll having a wrap of the same shape on the end plate and meshing with the fixed scroll to form a plurality of compression chambers, and a revolving drive shaft for supporting a revolving drive shaft of the revolving scroll and forming a crankshaft at a lower end thereof. A discharge port configured to include a shaft of an electric motor, a main frame that supports the crankshaft, and a sub-bearing, and that communicates with the central compression chamber formed at the center of the bottom surface of the fixed scroll; A discharge chamber provided on one side of the sealed container, a discharge pipe passing through the sealed container from the discharge chamber and communicating with the outside, and passing the discharge chamber and the sealed container in the same direction as the discharge pipe. Previous In a scroll compressor having a suction pipe communicating with a suction port communicating with a compression chamber, an outer peripheral portion of the fixed scroll communicates with the suction pipe and the main frame side at a substantially intermediate position inside the fixed scroll. Forming a first communication hole and the second communication hole continuous with each other, on an outer peripheral portion of the main frame, connected to the second communication hole,
A third communication hole communicating the fixed scroll side and the motor chamber on the electric motor side is formed, and a suction hole communicating with the suction port on the orbiting scroll side is provided at an intermediate portion of the main frame. A fourth communication hole for communication is formed.

The cross section of the first communication hole is circular, and the cross section of the second communication hole is formed in an arc shape.

Alternatively, the cross section of the first communication hole is formed in an arc shape corresponding to the spiral wrap of the fixed scroll.

Alternatively, the cross section of the fourth communication hole is formed as a long hole.

On the other hand, a suction hole on the orbiting scroll side;
An annular groove communicating with the suction port is formed in the orbiting scroll. Alternatively, a suction hole on the orbiting scroll side and an annular groove communicating with the suction port are formed in the main bearing. On the other hand, a plurality of the fourth communication holes are formed along the annular groove.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail based on embodiments with reference to the accompanying drawings. FIG. 1 (a)
FIG. 3 is a longitudinal sectional view showing a first embodiment of the scroll compressor according to the present invention, and FIGS. The same reference numerals are used for the same parts as in the conventional example.

A motor 3 is arranged in a compression section 2 and a motor chamber 1a in a sealed container 1. Then, the compression unit is connected to the end plate 4a.
A fixed scroll 4 having a spiral wrap 4b and a revolving scroll 5 having a wrap 5b of the same shape on a head plate 5a and meshing with the fixed scroll 4 to form a plurality of compression chambers 9 are provided.

Further, a shaft 11 of the electric motor 3 for supporting the orbiting drive shaft 5c of the orbiting scroll 5 and forming a crankshaft 8 at the lower end thereof for orbiting driving, a main frame 7 for supporting the crankshaft 8; A discharge port 14 communicating with the central compression chamber 9 formed at the center of the bottom surface of the fixed scroll 4 is provided.

Further, there is provided a discharge chamber 15 which communicates with the discharge port 14 and is provided on one side of the sealed container 1. Further, a discharge pipe 17 communicating with the outside through the discharge chamber 15 is provided. On the other hand, a suction pipe 16 communicating with the suction port 18 through the discharge chamber 15 and the sealed container 1 in the same direction as the discharge pipe 17 is provided for sucking the refrigerant gas from outside.

Here, according to the present invention, the suction pipe 16 and the main frame side are communicated with the outer peripheral portion of the fixed scroll 4 so as to communicate with each other at a substantially intermediate position inside the fixed scroll 4. 4c and the second communication hole 4d are formed. A third communication hole 7a is formed in the outer peripheral portion of the main frame 7 and communicates with the second communication hole 4d and communicates the fixed scroll 4 and the motor chamber 1a on the electric motor 3 side. At the same time, a fourth communication hole 7b communicating the motor chamber 1a with the suction hole 5d communicating with the suction port 18 on the orbiting scroll 5 side is formed in an intermediate portion of the main frame 7 along an annular groove 5e described later. Are formed.
The cross section of the first communication hole 4c is formed in an arc shape corresponding to the spiral wrap 4b of the fixed scroll 4, and the cross section of the second communication hole 4d is formed in an arc shape. . On the other hand, the orbiting scroll 5 is formed with an annular groove 5e that communicates the suction hole 5d on the orbiting scroll side 5 and the suction port 18.

Next, the operation of the present invention will be described.
On the outer peripheral portion of the fixed scroll 4, the first communication hole 4c is formed.
And the second communication hole 4d is formed, and the third communication hole 7a is formed on the outer peripheral portion of the main frame 7 so as to communicate with the second communication hole 4d. Since the fourth communication hole 7b is formed, the low-temperature refrigerant gas sucked from the suction pipe 16 bypasses each of the communication passages, so that the electric motor of the motor chamber 1a provided in the middle thereof To cool. Since the cross section of the first communication hole 4c is formed in an arc shape, and the cross section of the second communication hole 4d is formed in an arc shape, the passage resistance of the horizontal scroll compressor is reduced, and the pressure is reduced. Loss can be reduced.

On the other hand, FIG. 2A is a longitudinal sectional view showing a second embodiment of the scroll compressor according to the present invention, and FIGS. 2B and 2C are transverse sectional views taken along lines AA 'and BB', respectively. is there. This embodiment corresponds to a vertical scroll compressor.

The cross section of the first communication hole 4c is formed in a circular shape. The effect in this case is the same as that of the first embodiment.

On the other hand, FIG. 3A is a longitudinal sectional view showing a third embodiment of the scroll compressor according to the present invention, and FIG.
And (c) are cross-sectional views for AA 'and BB', respectively. In this embodiment, the cross section of the fourth communication hole 7b is formed as a long hole. On the other hand, an annular groove 5e communicating the suction hole 5d of the orbiting scroll side 5 with the suction port 18 is provided.
Is formed on the main frame 7. The effect in this case is the same as that of the first embodiment.

[0021]

As described above, according to the present invention, a compressor and a motor are arranged in a motor chamber in a sealed container, and the compressor is provided with a fixed scroll having a spiral wrap on a head plate and a head having the same shape as the head plate. An orbiting scroll having a wrap and meshing with the fixed scroll to form a plurality of compression chambers;
A motor shaft that supports the orbiting drive shaft of the orbiting scroll and forms a crankshaft at the lower end for orbital driving, a main frame that supports the crankshaft, and a sub-bearing. A discharge port that communicates with the central compression chamber formed in the container, a discharge chamber that communicates with the discharge port, and is provided on one side of the sealed container, and that communicates with the outside through the sealed container from the discharge chamber. In a scroll compressor having a discharge pipe and a suction pipe communicating with a suction port communicating with the compression chamber through the discharge chamber and a sealed container in the same direction as the discharge pipe, on an outer peripheral portion of the fixed scroll, The suction pipe and the main frame side communicate with each other at a substantially intermediate position inside the fixed scroll to form a first series communication hole and a second communication hole, and the second communication hole is formed on an outer peripheral portion of the main frame. Communication hole A third communication hole communicating with the fixed scroll side and the motor chamber on the electric motor side, and communicating with the motor chamber and the suction port on the orbiting scroll side in an intermediate portion of the main frame. A fourth communication hole communicating with the suction hole was formed.

As a result, it is possible to provide a scroll compressor having a suction compressor in the same direction as the discharge pipe and having improved cooling performance of the motor of the scroll compressor.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view showing a first embodiment of a scroll compressor according to the present invention, and FIGS. 1B and 1C are transverse sectional views taken along AA ′ and BB ′, respectively.

FIG. 2A is a longitudinal sectional view showing a second embodiment of the scroll compressor according to the present invention, and FIGS. 2B and 2C are transverse sectional views taken along lines AA ′ and BB ′, respectively.

FIG. 3A is a longitudinal sectional view showing a third embodiment of the scroll compressor according to the present invention, and FIGS. 3B and 3C are transverse sectional views taken along lines AA ′ and BB ′, respectively.

FIG. 4 is a longitudinal sectional view showing an example of a conventional scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealed container 1a Motor chamber 2 Compression part 3 Electric motor 4 Fixed scroll 4a Fixed scroll end plate 4b Fixed scroll wrap 4c First series communication hole 4d Second communication hole 5 Orbiting scroll 5a Orbiting scroll end plate 5b Orbiting scroll lap 5c Orbit Scroll turning drive shaft 5d Suction hole 5e Annular groove 7 Main frame 7a Third communication hole 7b Fourth communication hole 8 Crankshaft 9 Compression chamber 10 Secondary bearing 11 Shaft 13 Oldham ring 14 Discharge port 15 Discharge chamber 16 Suction pipe 17 Discharge pipe 18 Suction port

Claims (7)

[Claims] An electric motor is disposed in a compression section and a motor chamber in a sealed container, and the compression section has a fixed scroll having a spiral wrap on a head plate and a wrap of the same shape on a head plate. A rotary scroll that meshes with each other to form a plurality of compression chambers; a shaft of an electric motor that supports the rotary drive shaft of the rotary scroll and forms a crankshaft at the lower end to rotate and drive; and supports the crankshaft. A discharge port formed of a main frame and a sub-bearing and communicating with the central compression chamber formed at the center of the bottom surface of the fixed scroll; and a discharge provided on one side of the sealed container communicating with the discharge port. A discharge pipe communicating with the outside through the sealed container from the discharge chamber, and a suction pipe communicating with a suction port communicating with the compression chamber through the discharge chamber and the sealed container in the same direction as the discharge pipe. Possess In the scroll compressor, a first communication hole and a second communication hole which communicate the outer peripheral portion of the fixed scroll with the suction pipe and the main frame side and are connected to each other at a substantially intermediate position inside the fixed scroll. Forming a third communication hole, which communicates with the fixed scroll side and the motor chamber on the electric motor side, in an outer peripheral portion of the main frame, and communicates with the fixed scroll side and the motor chamber on the electric motor side. A scroll compressor, wherein a fourth communication hole communicating the motor chamber and a suction hole communicating with the suction port on the orbiting scroll side is formed in an intermediate portion. 2. The scroll compressor according to claim 1, wherein a cross section of said first communication hole is circular, and a cross section of said second communication hole is formed in an arc shape. 3. The scroll compressor according to claim 1, wherein a cross section of the first communication hole is formed in an arc shape corresponding to a spiral wrap of the fixed scroll. 4. The scroll compressor according to claim 1, wherein a cross section of said fourth communication hole is formed as an elongated hole. 5. The scroll compressor according to claim 1, wherein a suction hole on the orbiting scroll side and an annular groove communicating with the suction port are formed in the orbiting scroll. 6. The scroll compressor according to claim 1, wherein a suction hole on the orbiting scroll side and an annular groove communicating with the suction port are formed in the main bearing. 7. The scroll compressor according to claim 1, wherein a plurality of said fourth communication holes are formed along said annular groove.