JP3146705B2 - Scroll compressor - Google Patents

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 compressor suitable for improving performance and reliability.

[0002]

2. Description of the Related Art A conventional compressor is disclosed, for example, in Japanese Utility Model Laid-Open No. 3-321.
No. 89, JP-A-3-74591, the high-temperature gas discharged from the compression chamber is once drawn out of the sealed container of the compressor, and is again returned to the space of the sealed container containing the electric motor. A return pipe is provided. Thereby, the low-temperature suction gas is heated by the high-temperature gas discharged from the compression chamber, and it is possible to prevent a decrease in compressor performance,
Further, the lubricating oil contained in the discharge gas can be returned into the closed container.

However, there is a problem that the pipe has to be drawn out of the closed container of the compressor, and the space of the compressor occupying the equipment mounted with the compressor such as a room air conditioner becomes large.

Further, in the conventional compressor, it is not considered that the compressor is used for a heating / cooling heat pump type room air conditioner which also performs a heating operation, and a pipe drawn out of the compressor serves as a radiator and is discharged from a compressor closed container. Gas temperature decreases. Therefore, since the temperature of the heat exchanger that heats the indoor air decreases, high-temperature indoor blow-off air cannot be supplied, and there is a problem that comfort as a heater decreases.

[0005]

The compression mechanism is heated by the high-temperature gas discharged from the compression chamber without increasing the space for mounting the compressor in the room air conditioner.
It is necessary to prevent the internal low-temperature suction gas from being heated, reduce the heating loss, and improve the performance of the compressor.

[0006] Further, there is a demand for increasing the temperature of air blown out of the indoor unit during heating operation of a room air conditioner for both cooling and heating to improve comfort. In order to increase the temperature of the air blown out from the indoor unit, it is effective to use a superheated region of the gas discharged from the compressor.
It is more economical than raising the condensation temperature.

An object of the present invention is to prevent the intake gas from being heated by the high-temperature gas discharged from the compression chamber without changing the external dimensions of the compressor, and to reduce the temperature of the gas discharged from the compressor closed vessel by overheating. An object of the present invention is to provide a scroll compressor capable of maintaining a high temperature in a region.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric motor for rotating a crankshaft, a frame having a bearing for supporting the crankshaft, and disposed between the frame and a fixed scroll, and turned by the crankshaft. A orbiting scroll to which a force is applied is provided in the closed container, and a second scroll is provided on the back side of the fixed scroll and having a discharge port.
In a scroll compressor having a space, a heat shield plate covering the fixed scroll, a suction pipe inserted from outside the sealed container, connected to a suction chamber of the fixed scroll through the heat shield plate, A gas flow passage communicating the second space and the first space in which the electric motor is stored,
This is achieved by providing a discharge pipe that communicates the first space with the outside of the closed container. Further, the object is to provide a motor having a bearing for supporting the crankshaft, an electric motor for rotating the crankshaft, a orbiting scroll disposed between the frame and the fixed scroll, and provided with a turning force by the crankshaft. Is provided in a closed container, in a scroll compressor having a second space on the back side of the fixed scroll and having a discharge port, inserted from the outside of the closed container, the suction chamber of the fixed scroll and A suction pipe connected thereto, a heat insulating groove provided outside the suction chamber of the fixed scroll, a gas flow path communicating the second space and the first space in which the electric motor is housed, This is achieved by providing a discharge pipe that communicates the space 1 with the outside of the closed container.

[0009]

The gas discharged from the compression chamber has the highest temperature inside the compressor. Since this high-temperature gas passes through a gas flow path provided in the closed container and is guided to the space in which the electric motor is housed, the high-temperature gas does not come into contact with the fixed scroll having the low-temperature suction chamber. Heating can be prevented, heating loss can be reduced, and efficiency of the compressor can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. First, the overall configuration will be described.

FIG. 1 is a longitudinal sectional view of a scroll compressor according to one embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. FIG.

In the scroll compressor shown in FIG. 1, a compression mechanism section is accommodated in an upper portion in an airtight container 1, and a motor section is accommodated in a lower portion.
A storage section for storing lubricating oil is provided at the bottom. The compression mechanism section has the fixed scroll 2, the orbiting scroll 3, the frame 4, and the Oldham ring 27 as main components.
The suction chamber 7 of the fixed scroll 2 is provided with a suction pipe 8 connected to an external refrigeration cycle.

The fixed scroll 2 and the orbiting scroll 3 form a compression chamber 6 by meshing spiral wrap portions standing on the respective base plate surfaces inwardly with each other.

The eccentric portion 5a of the crankshaft 5 is rotatably fitted into the boss portion of the orbiting scroll 3 via the orbiting bearing 20, and the groove of the base plate portion (not shown) and the groove of the frame 4 (not shown). , An Oldham ring 27 is slidably disposed.

The base plate of the orbiting scroll 3 has a communication hole 18 penetrating the base plate and communicating with the compression chamber 6 during the compression process.
a is formed, and an intermediate pressure chamber 21 is formed in which a space surrounded by the frame 4 and the base plate of the orbiting scroll 3 is made lower in pressure than the inside of the closed vessel 1. The base plate of the orbiting scroll 3 rotates while being supported so as to be pressed against the fixed scroll 2 by the pressure difference between the intermediate pressure and the suction pressure of the compression mechanism.

The outer periphery of the frame 4 is fixed to the closed container 1 by welding or the like, and the fixed scroll 2 is fastened to the frame 4 by bolts 29.

A rotor 10 constituting an electric motor 11 is fitted to the crankshaft 5 by shrink fitting or the like.
The stator 9 that constitutes 1 is fixed in the closed casing 1 by shrink fitting or the like. Reference numeral 22 denotes a main bearing that supports the crankshaft 5 by the frame 4, and reference numeral 13 denotes an auxiliary bearing that supports a lower portion of the crankshaft 5. The lower end of the crankshaft 5 is immersed in lubricating oil 25, and an oil supply passage 24 is provided that penetrates the crankshaft 5 in the axial direction and has one end communicating with the swing bearing 20. Further, in the middle of the refueling passage 24,
A lubricating oil supply hole 23 penetrating through the crankshaft 5 in the radial direction and communicating with the main bearing 22 is provided.

The operation of the scroll compressor will be described.

The rotor 10 receives a rotational force from the stator 9 to rotate the crankshaft 5, and the orbiting scroll 3 eccentrically rotates (revolves) without rotating by the action of the Oldham ring 27. By the eccentric rotation of the orbiting scroll 3, the refrigerant gas sucked through the suction pipe 8 is gradually compressed from the suction chamber 7 of the fixed scroll 2 to the compression chamber 6, and is discharged from the discharge port 28 into the closed container 1. . The released refrigerant gas cools the electric motor unit and discharges it to be supplied from the pipe 14 to an external refrigeration cycle.

Next, a method of supplying lubricating oil to each bearing will be described. The lubricating oil stored at the bottom of the closed casing 1 is drawn up to one end of the slewing bearing 20 through the oil supply passage 24 of the crankshaft 5 due to the pressure difference between the intermediate pressure chamber 21 and the closed casing 1. A lubrication passage 24 is provided to the main bearing 22 by a pressure difference.
The lubricating oil sucked up is supplied through the lubricating oil supply hole 23. The sub bearing 13 below the crankshaft 5 is immersed in the lubricating oil reservoir 25.

Next, an embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 2 is an explanatory diagram showing the details of the structure of the gas passage 30 for guiding the discharged gas. 1 and 2,
Reference numeral 30 denotes a pipe-shaped gas flow path, 31 denotes a communication passage provided on the outer periphery of the fixed scroll 2 and the frame 4, 34 denotes a first space in which the compressor of the closed casing 1 is stored, and 34 denotes a fixed scroll. This is the second space where the second-compression mechanism is located.

According to this embodiment, the high-temperature gas discharged from the discharge port 28 at the center of the fixed scroll 2 is
The gas is discharged through the gas passage 30 through the communication passage 31 provided in the frame 4 to the first space 33 in which the electric motor 11 is stored. Here, oil contained in the gas is separated, the stator 9 of the electric motor 11 is cooled, and is sent from the discharge pipe 14 to the refrigeration cycle.

As described above, according to the present embodiment, the high-temperature gas discharged from the compression chamber 6 is guided to the first space 33 on the electric motor side by the gas passage 30, so that the suction chamber formed inside the fixed scroll 2 is provided. Heating the suction gas in 7 is eliminated, and the efficiency of the compressor is improved.

Next, another embodiment of the present invention will be described. FIG. 3 is a sectional view of a gas flow path in a compressor according to a second embodiment of the present invention.

In FIG. 3, 35 is a fixed scroll 2
Is a heat insulating plate, 36 is a heat insulating packing, 39 is a gas flow path formed between the heat insulating plate 35 and the sealed container 1, 41 is
This is a sealed space provided between the fixed scroll 2 and the heat shield plate 35, communicates with the compression chamber 6 during compression by the communication hole 42, and is maintained at a pressure lower than the pressure in the sealed container 1.

The operation of the scroll compressor is as described in the first embodiment.
This is the same as the embodiment of FIG.

According to this embodiment, the high-temperature gas discharged from the discharge port 28 at the center of the fixed scroll 2 is
The gas is discharged into the first space 33 containing the electric motor 11 through the communication path 31 provided in the frame 4 by the gas flow path 39. Here, oil contained in the gas is separated, the stator 9 of the electric motor 11 is cooled, and is sent from the discharge pipe 14 to the refrigeration cycle.

As described above, according to this embodiment, the high-temperature gas discharged from the compression chamber 6 is guided to the first space 33 on the electric motor side by the gas flow path 39, so that the suction chamber formed inside the fixed scroll 2 is formed. There is no heating of the suction gas in 7, which has the effect of improving the efficiency of the compressor.

The space 41 surrounded by the fixed scroll 2 and the heat shield plate 35 has an effect of heat insulation and an effect of reducing deformation of the fixed scroll and improving compression performance.

Next, a third embodiment of the present invention will be described. FIG. 4 is a sectional view of the structure of the compressor according to the third embodiment of the present invention. FIG. 5 is an explanatory diagram showing the structure of the fixed scroll 2.

4 and 5, reference numeral 43 denotes a heat insulating groove provided outside the suction chamber 7 of the fixed scroll 2.

According to the present embodiment, the fixed scroll 2 is heated by the high-temperature discharge gas. However, since the heat-insulating groove 43 is provided outside the suction chamber 7, the heating of the suction gas in the suction chamber 7 is prevented. Can reduce and improve compressor performance.

[0034]

According to the present invention, the fixed scroll is not heated by the discharge gas because the gas passage for guiding the high-temperature discharge gas to the space on the motor side is provided inside the compressor closed space. The loss of heating the suction gas in the suction chamber inside the fixed scroll can be reduced, and the efficiency of the compressor improves.

[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 cross-sectional view of the gas flow path of FIG.

FIG. 3 is a sectional view of a scroll compressor according to a second embodiment of the present invention.

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

5 is a cross-sectional view of the structure of the fixed scroll in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Closed container, 2 ... Fixed scroll, 11 ... Electric motor, 2
8 ... Discharge port, 30 ... Gas flow path, 33 ... First space.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Shigeru Kawanan 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Pref. Hitachi, Ltd. Living Equipment Division (56) References 58) Field surveyed (Int.Cl. ⁷ , DB name) F04C 18/02 311

Claims (2)

(57) [Claims] And 1. A motor for rotating the crank shaft, a frame having a bearing for supporting the crankshaft, is disposed between the fixed scroll and the frame, and orbiting scroll swirling force is applied by the crankshaft Is provided in a closed vessel, in a scroll compressor having a second space on the back side of the fixed scroll and having a discharge port, a heat shield plate covering the fixed scroll, and from outside the closed vessel. A suction pipe inserted and connected to the suction chamber of the fixed scroll through the heat shield plate,
A scroll compressor comprising: a gas flow path that communicates the second space with the first space in which the electric motor is housed; and a discharge pipe that communicates the first space with the outside of the closed container. 2. An electric motor for rotating a crankshaft, a frame having a bearing for supporting the crankshaft, an orbiting scroll disposed between the frame and a fixed scroll, and provided with a turning force by the crankshaft. Is provided in a closed container, in a scroll compressor having a second space on the back side of the fixed scroll and having a discharge port, inserted from the outside of the closed container, the suction chamber of the fixed scroll and A suction pipe connected thereto, a heat insulating groove provided outside the suction chamber of the fixed scroll, a gas flow path communicating the second space and the first space in which the electric motor is housed, A scroll compressor comprising: a discharge pipe that communicates the space of 1 with the outside of the closed container.