JPH0599182A - Closed type motor-operated compressor - Google Patents

Abstract

PURPOSE:To provide a closed type motor-operated compressor which is formed in a compact manner and reduced in a cost, improves the efficiency of the heat-exchanger of a refrigerating cycle through reliable reduction of an amount of lubricating oil delivered to the refrigerating cycle through a compressor delivery pipe, and improves reliability of a compressor through ensurance of an oil amount in a compressor. CONSTITUTION:A closed type motor-operated compressor wherein an electric motor 8 and a compression mechanism part 7 coupled to the electric motor through a crankshaft, a shield space by a shield ring 15 having a cylinder part at least a part of which is extended in the direction of the axis of the compressor and which is arranged concetrically with the axis of the compressor is formed between a compression mechanism part 7 and the electric motor 8, and the suction port of a delivery pipe 4a is positioned in the shield space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic electric compressor, which is mainly used for air conditioning or refrigeration, and is particularly suitable for improving the performance of a refrigeration cycle and ensuring reliability of the compressor. It concerns a compressor.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. FIG. 4 is a vertical cross-sectional view of a conventional hermetic scroll compressor, FIG. 5 is a system diagram of a refrigeration cycle having a conventional oil separator, and FIG. 6 is an example of a discharge pipe of the conventional hermetic scroll compressor. FIG. Figure 4
In the scroll compressor shown in (1), a compression mechanism section 7 is housed in the upper part of a closed container 9 and an electric motor 8 is housed in the lower part. Lubricating oil 10 for lubricating the sliding portion of the compression mechanism portion 7 is enclosed in the closed container 9 and stored in the closed container bottom 9a.

The compression mechanism section 7 has a fixed scroll 7a, a revolving scroll 7b, a frame 14, a crankshaft 11, and an Oldham ring 7c as main constituent elements. Electric motor 8
Is composed of a stator 8a and a rotor 8b. The stator 8a is fixed in the closed container 9 by shrink fitting, and the rotor 8b is fixed to the crankshaft 11 by press fitting. The outer peripheral portion of the frame 14 is fixed to the closed container 9 and has a bearing for receiving the rotation of the crankshaft 11. The fixed scroll 7a is fastened to the frame 14.

The fixed scroll 7a and the swivel scroll 7b each have a spiral wrap standing upright on the base plate, and the wraps are meshed with each other inward to form a compression chamber. .. The eccentric portion of the crankshaft 11 is rotatably fitted into the boss portion of the turning scroll 7b, and the Oldham ring 7c prevents rotation and revolves. Fixed scroll by revolving swivel scroll 7b
The refrigerant gas sucked from the suction port (not shown) of the nozzle 7a is gradually compressed in the compression chamber.

Lubricating oil 10 is supplied to bearing portion 12a and crank portion 1 by rotation of crankshaft 11 directly connected to rotor 8b.
After the oil is supplied to 2b and the like, it is discharged from the discharge port 13 and returns to the closed container bottom 9a again, but part of it becomes atomized oil due to the effect of stirring of the rotor 8b of the electric motor part. The refrigerant gas enters the compression mechanism portion 7 from the suction pipe 4b, is compressed, is discharged from the discharge port 13 into the closed container 9, and is sent to the refrigeration cycle from the discharge pipe 4a together with the sprayed lubricating oil.

The conventional refrigeration cycle shown in FIG. 5 comprises a compressor 1, heat exchangers 2a and 2b, an expansion mechanism 3, and a piping system 4 connecting these, and circulates a refrigerant. Oil separator
The compressor 5 separates the sprayed lubricating oil discharged from the discharge pipe 4a of the compressor 1 together with the refrigerant, and is provided with a bypass conduit 6 that quickly returns only the lubricating oil component to the compressor side (inside). There is. This improves the reliability of the compressor by eliminating the lack of lubricating oil inside the compressor, prevents the circulation of lubricating oil to the heat exchanger, and the lubricating oil adheres to the inner wall of the heat exchanger pipe to transfer heat. This prevents the efficiency of the refrigeration cycle from decreasing due to a decrease in the rate.

[0007]

In the above-mentioned prior art, since the oil separator circuit for returning the lubricating oil sent from the compressor discharge pipe to the refrigeration cycle to the compressor promptly is provided outside the compressor, the refrigeration is not possible. There is a problem that the cycle structure becomes complicated and large and the cost becomes high. Therefore, without providing this oil separator circuit, the discharge pipe 4A is projected near the center of the container as shown in FIG.
In some cases, a measure is taken such as centrifugal separation of a lubricating oil component having a high density due to the swirling flow of the compressor to increase the amount of the refrigerant component sent out of the compressor to reduce the amount of lubricating oil.

In this case, since the centrifugally separated lubricating oil is re-atomized by the electric motor rotor, the gas-liquid separation ability between the lubricating oil and the refrigerant is not sufficient, and the lubricating oil inside the compressor is insufficient, resulting in compression. There was a problem of reducing the reliability of the machine. In addition, the circulation of the lubricating oil to the heat exchanger may be caused, and the lubricating oil may adhere to the inner wall of the heat exchanger pipe to reduce the heat transfer coefficient, resulting in a reduction in the efficiency of the refrigeration cycle. Further, there is a problem that a space for disposing the discharge pipe up to the upper part of the rotor is required, which leads to an increase in the size of the compressor.

As another example of gas-liquid separation inside the compressor, for example, a technique described in Japanese Patent Laid-Open No. 58-160587 is known. According to the technique, a gas-liquid separation blade is provided above the rotor of the electric motor unit, and a partition plate that almost entirely separates the electric motor and the compression mechanism unit is provided above the electric motor unit, and the discharge pipe is connected to the space above the partition plate. It is a thing. Here, the partition plate has its outer periphery in contact with the inner wall of the closed container and its inner periphery in contact with the bearing boss. This conventional technique has a problem that the internal structure of the compressor is complicated and the cost is increased.

The present invention has been made to solve the above-mentioned problems of the prior art. It is compact, low-cost, and reliably reduces the amount of lubricating oil sent from the compressor discharge pipe to the refrigeration cycle. It is an object of the present invention to provide a hermetic electric compressor capable of increasing the efficiency of the heat exchanger of the refrigeration cycle and securing the amount of oil in the compressor to improve the reliability of the compressor.

[0011]

In order to achieve the above object, the structure of a hermetic electric compressor according to the present invention includes an electric motor and a compression mechanism portion connected to the electric motor by a crankshaft in a hermetic container. In a hermetic electric compressor that accommodates, a shielding space is formed between a compression mechanism portion and an electric motor by a shielding member having at least a part having a cylindrical portion concentric with the axis of the compressor. The suction port of the discharge pipe is located in the space. More specifically, for example, a shield ring formed by curling the tip in a flare shape between the compression mechanism portion and the coil end of the electric motor and forming a main portion in a cylindrical portion concentric with the axial center of the compressor. And the suction port of the discharge pipe is disposed inside the shielding ring.

[0012]

The function of the above technical means is as follows. That is, with the above-described configuration, the inside of the shielding ring is in a state in which the atomized oil mist is unlikely to enter from the outside,
Since the suction port of the discharge pipe is arranged inside the shielding ring, the lubricating oil component sent to the refrigeration cycle from the discharge pipe is reliably separated and quickly returned to the inside of the compressor to improve the reliability of the compressor. It is possible to secure the same and to eliminate the oil separator circuit on the refrigeration cycle side, thereby realizing simplification of the in-machine configuration, downsizing, and low cost.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Each embodiment of the present invention will be described below with reference to FIGS. [Embodiment 1] FIG. 1 is a sectional view of an essential part of a hermetic scroll compressor according to an embodiment of the present invention. In the figure, those having the same reference numerals as those in FIG. In the embodiment shown in FIG. 1, a shield ring 15 made of sheet metal is arranged between a frame 14 which is a part of the compression mechanism portion 7 and a stator coil end 8c which is a part of an electric motor, so that the discharge pipe 4a can be provided. The suction port is arranged inside the shielding ring 15. More specifically, the shield ring 15 is formed by curling the ring tip in a flare shape and forming a main portion in a cylindrical portion concentric with the axial center of the compressor, and the cylindrical portion is the outer periphery of the frame 14. It is configured to be secured to the portion and to secure an insulation distance from the stator coil end 8c at the flared curled portion.

According to this embodiment, the lubricating oil discharged together with the discharge gas from the discharge port 13 becomes a spray oil, and the frame 14 constituting the compression mechanism portion 7 and the notch groove provided on the outer periphery of the fixed scroll. When passing through 16 and falling into the electric motor room, it is hindered by the shielding ring 15, so that the inside of the shielding ring 15 is in a state in which the atomized oil does not easily enter from the outside, and the density of the atomized oil can be kept low. .. here,
Since the suction port of the discharge pipe 4a is located inside the shielding ring 15, the lubricating oil sent from the discharge pipe 4a to the refrigeration cycle is significantly reduced and quickly returned to the inside of the compressor to improve the reliability of the compressor. It is possible to secure the sex. Further, the structure of the gas-liquid separating means in the compressor is simple, and the oil separator circuit on the refrigeration cycle side is eliminated, so that simplification, downsizing and cost reduction can be realized.

[Embodiment 2] FIG. 2 is a sectional view of a main part of a hermetic scroll compressor according to another embodiment of the present invention.
In the figure, those parts that are the same as those corresponding parts in FIG. In the embodiment shown in FIG. 2, a shielding ring 17 having an electrically insulating characteristic is arranged between a frame 14 which is a part of the compression mechanism portion 7 and a stator coil end 8c which is a part of an electric motor, and a discharge pipe is provided. The suction port 4a is arranged inside the shielding ring 17. More specifically, the shield ring 17 is made of a material having an electric insulating property, the ring tip is curled in a flare shape, and the main portion is formed in a cylindrical portion concentric with the axial center of the compressor. The cylindrical portion is attached to the outer peripheral portion of the frame 14, and the flared curled portion is close to the stator coil end 8c.

According to the embodiment shown in FIG. 2, since the shield ring 17 is made of a material having an electrically insulating property, the gap between the shield ring 17 and the motor coil end 8c can be made sufficiently small. The effect of the shield ring can be further enhanced. Therefore, the lubricating oil discharged together with the discharge gas from the discharge port 13 becomes atomized oil, passes through the notch groove 16 provided on the outer periphery of the compression mechanism portion 7,
When falling into the electric motor room, the inside of the shielding ring 17 is in a state in which the atomized oil is more difficult to enter from the outside than in the first embodiment, and the density of the atomized oil can be kept low. Therefore, it is possible to more reliably prevent the lubricating oil from being sent to the refrigeration cycle and to secure the lubricating oil to be supplied to the compression mechanism section.

[Embodiment 3] Next, FIG. 3 is a cross-sectional view of essential parts of a hermetic scroll compressor according to still another embodiment of the present invention. In the figure, those parts that are the same as those corresponding parts in FIG. In the embodiment shown in FIG. 3, a main part is disposed between a frame 14 which is a part of the compression mechanism part 7 and a rotor end ring 19 which is a part of an electric motor, and a cylindrical part which is concentric with the shaft center in the axial direction of the compressor. Shield ring 1 formed on
8 and the bottom surface 18a of the shield ring is mounted in proximity to the rotor end ring 19, and the frame 14 and the shield ring 1 are attached.
8 and the ring bottom surface 18a form a small space 20, and the suction port portion of the discharge pipe 4a is arranged inside the small space 20.

According to the embodiment shown in FIG. 3, the lubricating oil discharged from the discharge port 13 together with the discharge gas becomes atomized oil, passes through the notch groove 16 provided on the outer periphery of the compression mechanism portion 7,
After being dropped into the electric motor chamber and then being sucked into the discharge pipe, the shield ring 18 has a narrow gap between the rotor end ring 19 and the shield ring bottom portion 18a that are rotating at high speed.
The small space 20 related to the inside is in a state in which the spray oil does not easily enter from the outside, and the density of the spray oil can be kept low. Since the suction port of the discharge pipe 4a is disposed inside the shielding ring 18, that is, in the small space 20, the lubricating oil sent from the discharge pipe 4a to the refrigeration cycle is greatly reduced, and the compressor is quickly introduced into the compressor. It can be returned to ensure the reliability of the compressor. Further, the structure of the gas-liquid separating means in the compressor is simple, and the oil separator circuit on the refrigeration cycle side is eliminated, so that simplification, downsizing and cost reduction can be realized.

In the above embodiments, the hermetic scroll compressor is described as an example, but the present invention is not limited to the scroll compressor, and other hermetic electric compressors, for example, hermetic rotary compressors. It goes without saying that it also applies to.

[0020]

As described in detail above, according to the present invention, the amount of lubricating oil delivered from the compressor discharge pipe to the refrigeration cycle can be reduced reliably and compactly, and the heat of the refrigeration cycle can be reduced. While increasing the efficiency of the exchanger,
It is possible to provide a hermetic electric compressor that can secure the amount of oil in the compressor and enhance the reliability of the compressor.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a hermetic scroll compressor according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a hermetic scroll compressor according to another embodiment of the present invention.

FIG. 3 is a sectional view of an essential part of a hermetic scroll compressor according to still another embodiment of the present invention.

FIG. 4 is a vertical sectional view of a conventional hermetic scroll compressor.

FIG. 5 is a system diagram of a refrigeration cycle having a conventional oil separator.

FIG. 6 is a cross-sectional view of essential parts showing an example of a discharge pipe of a conventional hermetic scroll compressor.

[Explanation of symbols]

 4a Discharge pipe 7 Compression mechanism part 9 Airtight container 11 Crankshaft 14 Frame 8c Stator coil end 15 Shielding ring 17 Shielding ring 18 Shielding ring 19 Rotor end ring

Front page continuation (72) Inventor Shigenya Kawanami 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Hitachi Tochigi Plant (72) Inventor Atsushi Shimada 800, Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Hitachi, Ltd. In the Tochigi Plant (72) Inventor Tatsuya Wakana 2 709 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi 2 Hitachi Tochigi Electronics Co., Ltd.

Claims (4)

[Claims] 1. A hermetic electric compressor in which an electric motor and a compression mechanism portion connected to the electric motor by a crankshaft are housed in a hermetic container, wherein at least a part of the compression mechanism portion and the electric motor are compressed. A hermetic electric compressor characterized in that a shielding space is formed by a shielding member having a cylindrical portion concentric with the shaft center in the machine axis direction, and a suction port of a discharge pipe is located in the shield space. 2. A hermetic electric compressor in which an electric motor and a compression mechanism portion connected to the electric motor by a crankshaft are housed in a hermetically sealed container, wherein a tip is provided between the compression mechanism portion and the coil end of the electric motor. A sheet metal shield ring, which is curled like a flare and whose main part is formed in a cylindrical portion concentric with the axial center of the compressor, and the suction port of the discharge pipe is arranged inside the shield ring. A hermetically-sealed electric compressor. 3. A hermetic electric compressor in which an electric motor and a compression mechanism portion connected to the electric motor by a crankshaft are housed in a hermetically sealed container, wherein a tip is provided between the compression mechanism portion and the coil end of the electric motor. A shielding ring having electrical insulation characteristics is provided, which is curled like a flare and has a main portion formed in a cylindrical portion concentric with the axial center of the compressor, and the suction port of the discharge pipe is arranged inside the shielding ring. A hermetic electric compressor characterized by being installed. 4. A hermetic electric compressor compressor, wherein an electric motor and a compression mechanism unit connected to the electric motor by a crankshaft are housed in a hermetically sealed container, wherein a compression mechanism unit and a rotor end ring of the electric motor are provided. A shield ring having a tip close to the rotor end ring and a main portion formed in a cylindrical portion concentric with the axial center of the compressor is provided, and the suction port of the discharge pipe is disposed inside the shield ring. A characteristic hermetic electric compressor.