JP3389682B2 - Hermetic 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 hermetic scroll compressor.

[0002]

2. Description of the Related Art A conventional hermetic scroll compressor of this type will be described with reference to the drawings.

In FIG. 4, the inside of the closed container 1 is partitioned by the compression mechanism 2 and the electric motor 3 into a discharge chamber 1a, a compression mechanism side electric motor chamber 1b, and an anti-compression mechanism side electric motor chamber 1c.
The discharge chamber 1a and the compression mechanism side electric motor chamber 1b are in communication with the refrigerant gas passages 4 and 4a, and the compression mechanism side electric motor chamber 1b and the anti-compression mechanism side electric motor chamber 1c are in communication with each other through an oil return passage 5. Further, an oil sump 6 is provided at the bottom of the anti-compression mechanism side electric motor chamber 1c.

The compression mechanism section 2 comprises a fixed scroll 7, an orbiting scroll 8, a frame 9 and a rotary shaft 10. The fixed scroll 7 is composed of a disk-shaped fixed mirror plate 7a and a wrap 7b that is formed upright on the fixed mirror plate 7a and has either an involute curve or a curve similar to the involute curve. Mouth 11
And has a discharge port 12 at the center. The orbiting scroll 8 includes a disk-shaped orbiting mirror plate 8a and a wrap 8 which is formed upright on the orbiting mirror plate 8a and has either an involute curve or a curve similar to the involute curve.
b, and a drive shaft 8c on the mirror surface 8a and on the opposite lap surface. This fixed scroll 7 and orbiting scroll 8
Are engaged with each other to form the compression chamber 13. The frame 9 is provided with a bearing portion 14 in the central portion, and the bearing portion 14 receives the rotating shaft 10 via an eccentric bearing 15. The rotary shaft 10 has a rotor 3a of the electric motor 3 at the bottom.
Has an oil pump 16 at the end. The oil pump 16 is immersed in the oil sump 6 at the bottom of the closed container 1.

The frame 9 and the fixed scroll 7 are fixed by a plurality of bolts 17. Also, the rotating shaft 10
Oscillates the drive shaft 8c through the eccentric bearing 15, and the orbiting scroll 8 is supported by the frame 9 through an Oldham mechanism 18 including an Oldham ring and an Oldham key, so that the fixed scroll 7 does not rotate.
Perform a turning motion with respect to.

The suction pipe 19 penetrates the closed container 1 and is connected to the suction port 11 of the fixed scroll 7, and the discharge pipe 20 is
It is connected to the compression mechanism side electric motor chamber 1b by penetrating the hermetically sealed container 1 at an optimum position for discharging the refrigerant gas.

The flow of oil in the hermetic scroll compressor constructed as described above will be described.

The oil in the oil sump 6 is pumped up by the oil pump 16 and reaches the respective sliding parts of the compression mechanism part 2 through the oil passage 10a provided in the shaft center part of the rotary shaft 10. After lubricating each sliding part, oil is supplied from the oil discharge port 21 to the cover 22.
Is discharged inside. The oil collected in the cover 22 is the rotary shaft 1
With the balance weight portion 10b provided at 0, the rotary shaft 10 is pushed out to the compression mechanism side electric motor chamber 1b from the oil return hole 23 provided at the cover 22 every time the rotary shaft 10 rotates.
The discharged oil is returned to the oil sump 6 through the oil return path 5. At this time, the cover 22 prevented the oil discharged from the oil discharge port 21 from adhering to the rotating shaft 10 and being scattered into the closed container 1 by the centrifugal force of the oil and flowing out of the discharge pipe 20.

Further, as shown in FIG. 5, an oil drain tube 24 is provided in order to reliably guide the oil discharged into the cover 22 to the oil return path 5.

[0010]

However, in the above configuration, the oil discharged from the oil discharge port 21 directly adheres to the rotary shaft 10 and is scattered into the closed container 1 by the centrifugal force. Although it can be prevented by the cover 22, part of the oil discharged from the oil return hole 23 directly adheres to the coil end 25 immediately below the oil return hole 23, or
There was a case in which it once adhered to the rotor 3 a below the rotary shaft 10, was scattered by the centrifugal force, and adhered to the coil end 25. The oil adhering to the coil end 25 in the compression mechanism side electric motor chamber 1b drops as it is and returns to the oil sump 6 at the bottom of the anti-compression mechanism side electric motor chamber 1c. Discharged, the refrigerant gas passage 4,
There was also one that was blown up again by the refrigerant gas flowing toward the discharge pipe 20 via the oil sump 6 through the oil 4a and the oil return path 5, and filled the compression mechanism side electric motor chamber 1b. Since the oil filled in the compression mechanism side electric motor chamber 1b is discharged from the discharge pipe 20 to the outside of the closed container 1 together with the refrigerant gas, the oil in the closed container 1 is insufficient, and the discharged oil is a heat exchanger (not shown). However, there is a problem that not only the performance and reliability of the compressor but also the performance and reliability of the entire refrigeration cycle are deteriorated.

Further, in the structure shown in FIG. 5, since the width of the oil return passage 5 in the radial direction of the closed container 1 is narrow, the oil discharged to the cover 22 can be reliably introduced into the oil return passage 5.
There is a problem that the work of inserting the oil drainage tube 24 into the oil return path 5 is difficult.

The present invention solves the above-mentioned problems of the prior art, improves the workability in assembling the compressor, eliminates the discharge of oil from the discharge pipe 20 to the outside of the closed container 1, and improves the compressor and the freezer. The purpose is to prevent deterioration of the performance and reliability of the entire cycle.

[0013]

In order to solve the above-mentioned problems, the present invention covers an oil discharge port for discharging oil after lubricating the compression mechanism unit to the electric motor side of the compression mechanism unit, and the oil discharge port. The cover and an oil discharge pipe for discharging the oil inside the cover are formed, and the tip of the oil discharge pipe is connected to the oil return passage through an oil introduction pipe formed of a member having an electrically insulating property. .

Further, according to the present invention, the surface of the oil discharge pipe is coated with an electric insulating material. Further, according to the present invention, the oil discharge pipe is made of a member having an electric insulating property.

[0015]

According to the present invention, the oil discharge port for discharging the oil after lubricating the compression mechanism unit to the electric motor side of the compression mechanism unit, the cover for covering the oil discharge port, and the oil discharge pipe for discharging the oil inside the cover are provided. In addition to forming the oil discharge pipe, the tip of the oil discharge pipe is connected to the oil return passage through an oil introduction pipe made of a member having electric insulation properties, so that the compressor can be easily assembled and The oil can be reliably guided to the oil return path.

Further, according to the present invention, by covering the surface of the oil discharge pipe with an electric insulating material, it is possible to secure the insulation state between the oil discharge pipe and the cover and the coil end.

Further, according to the present invention, the oil discharge pipe is made of a member having an electrically insulating property, so that the oil discharge pipe and the cover and the coil end can be insulated from each other.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hermetic scroll compressor according to an embodiment of the present invention will be described below with reference to the drawings.

1 and 2, the same components as those of the conventional hermetic scroll compressor shown in FIG. 4 are designated by the same reference numerals for convenience, and the description thereof will be omitted.

As shown in FIG. 1, an oil discharge pipe 26 is led out from the cover 22, and its tip is connected to an oil introduction pipe 27 made of an electrically insulating material such as polyester.
The oil introduction pipe 27 is located close to the outside of the coil end 25 and is connected to the oil return passage 5. The connection between the oil discharge pipe 26 and the oil introduction pipe 27 may be direct or indirect. In short, the oil is transferred from the oil discharge pipe 26 to the oil introduction pipe 2
You should be guided to 7.

As a result, workability at the time of assembling the compressor is good,
It is possible to provide a compressor having improved performance and reliability of the compressor and the entire refrigeration cycle.

Further, as shown in FIG. 2, for example, a coil end 25 is knitted with a member having electrical insulation properties, for example, an oil introducing pipe 27 made of polyester, and the lower end of the oil introducing pipe 27 is placed at the upper end of the oil return passage 5. The same effect can be obtained by locating and opening the upper end and extending the opening of the oil discharge pipe 26 provided in the cover 22 to this opening.

Further, as shown in FIG. 3, if the oil introducing pipe 27 is formed in a substantially elliptical cross section with a predetermined width widened in the circumferential direction, the oil introducing pipe 27 will have a dimensional variation even if the position of the oil discharging pipe 26 varies. Two
It is possible to absorb the oil within the range of the circumferential width of 7 and reliably return the oil discharged from the oil discharge pipe 26 to the oil sump 6.

Although the shape of the oil discharge pipe 26 is not particularly limited, as shown in FIGS. 1 and 2, by providing the oil discharge pipe 26 at the bottom of the side surface of the cover 22, the oil remaining in the cover 22 can be removed. The amount can be reduced.

1 and 2, the surface of the oil discharge pipe 26 is, for example, polytetrafluoroethylene (hereinafter referred to as PT).
If the oil discharge pipe 26 is covered with an electric insulating material such as FE) or the oil discharge pipe 26 is made of a member having an electric insulating property, such as PTFE, the oil discharge pipe 26, the cover 22 and the coil end 25 are formed.
The insulation state of can be better secured.

In the present invention, the same effect can be obtained by using polyethylene terephthalate, polyphenylene sulfide or the like as the electric insulating material.

If a plurality of oil discharge pipes 26 and oil introduction pipes 27 are used, the amount of oil that can be discharged during one rotation of the rotating shaft 10 increases, so that the oil can be discharged quickly and the oil sump can be stored. The fluctuation of the oil amount of 6 is small, and the compressor can be operated stably.

[0028]

As is apparent from the above description, the present invention has the following advantages.
An oil discharge port for discharging oil after lubricating the compression mechanism part, a cover for covering the oil discharge port, and an oil discharge pipe for discharging oil inside the cover are formed on the electric motor side of the compression mechanism part.
By connecting the tip of this oil discharge pipe to the oil return path through an oil introduction pipe composed of a member having electrical insulation characteristics,
Since the compressor can be easily assembled, the workability is improved, and the oil can be reliably guided to the oil return path, so that the oil is not discharged from the discharge pipe to the outside of the closed container, and the compressor and The performance and reliability of the entire refrigeration cycle can be improved.

Also, according to the present invention, by insulating the surface of the oil discharge pipe with an electric insulating material, it is possible to secure the insulating state between the oil discharge pipe and the cover and the coil end.

Further, according to the present invention, the oil discharge pipe and the coil end can be insulated from each other by forming the oil discharge pipe with a member having an electrically insulating property.

[Brief description of drawings]

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

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

FIG. 3 is a sectional view taken along the line I-I in FIG.

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

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

[Explanation of symbols]

1 closed container 2 compression mechanism 3 electric motor 3a rotor 3b stator 5 oil return path 6 oil sump 21 Oil outlet 22 cover 26 Oil discharge pipe 27 Oil introduction pipe

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Yasuba 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Toshiharu Nozu 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Hideto Oka 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-4-370384 (JP, A) JP-A-4-72486 (JP, A ) Actual Kaihei 1-139193 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04C 23/00-29/10 F04C 18/02

Claims (3)

(57) [Claims] 1. A compression mechanism portion inside a closed container, an electric motor composed of a rotor and a stator, an oil reservoir provided at the bottom of the closed container, and a space between the stator and the inner wall of the closed container. An oil return path connecting both sides of the electric motor, and an oil outlet for discharging the oil after lubricating the compression mechanism portion to the electric motor side of the compression mechanism portion ;
The side bottom surface is the coil end end of the stator on the compression mechanism side.
A cover located below and an oil discharge pipe for discharging the oil inside the cover are formed, and the tip of the oil discharge pipe is connected to an oil return path through an oil introduction pipe made of a member having an electrically insulating property. The sealed scroll compressor we contacted. 2. The hermetic scroll compressor according to claim 1, wherein the surface of the oil discharge pipe is coated with an electric insulating material. 3. The hermetic scroll compressor according to claim 1, wherein the oil discharge pipe is made of a member having an electrically insulating property.