JP3114232B2 - 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 gas compressor.

[0002]

2. Description of the Related Art In a scroll compressor having low vibration and low noise characteristics, a suction chamber is provided at an outer peripheral portion, a discharge port is provided at a central portion of a spiral, and a flow of a compressed fluid is high in one direction with a high suction volume efficiency. It is well known.

[0003] However, especially when compressing gas, it is necessary to make the dimensional accuracy of the spiral part extremely high in order to reduce the leakage gap of the compressing part. There is a problem that the cost is high and the performance variation is large.

In order to solve this kind of problem, the structure shown in FIG. 4 as disclosed in Japanese Patent Application Laid-Open No. 55-107093 and the structure shown in FIG. Was invented, a part of the lubricating oil supplied to the sliding portion was caused to flow into the compression chamber together with the suction gas, and after the compression discharge,
In FIG. 4, after the lubricating oil is separated from the compressed gas and returned to the space communicating with the lubricating oil reservoir, the lubricating oil is introduced into the oil separating tank 118 provided outside the compressor. The lubricating oil is separated in the tank 118 and the capillary 1
In this configuration, the pressure is returned into the sealed container 112 at an intermediate pressure state between the discharge pressure and the suction pressure through 17b.

In FIG. 5, a shape is formed above the compressor section 224 .
The lubricating oil separated from the compressed gas in the high pressure chamber
Low pressure chamber from its open end 222 through oil return passage 221
It was a configuration that was returned inside . Further, in FIG.
The passage 19 is configured to be in contact with the closed containers 1 and 2.
Was.

[0006]

However, the compressed gas and the lubricating oil as shown in FIG.
In the configuration in which the lubricating oil is insufficient and the compressed gas returns to the closed container 112 through the structure 7b, when the compressed gas returns to the closed container 112, the viscosity is low, so that the passage resistance is small, and a large amount flows into the closed container 112 and is compressed. If the efficiency is remarkably reduced and the oil separating tank 118 is provided with a function of returning only the lubricating oil, the cost is high and the oil separating tank 118 itself becomes large, requiring a large installation space, but not returning the lubricating oil. Therefore, if the compressor operation is continued, there are various complicated problems such as a shortage of lubricating oil and a decrease in compression efficiency and damage to the compressor.

[0007] In the configuration in which the open end 222 of the oil return passage 221 is not close to the closed container 223 as shown in FIG. There has been a problem that the efficiency of the heat exchanger during the cycle is reduced, and at the same time a shortage of lubricating oil occurs. Also, as shown in FIG. 2, the oil return passage is connected to the closed container.
If this is done, the lubricating oil will
The lubricating oil returned to the low-pressure chamber is
Sufficient heat is dissipated because it becomes a thin line
There was a problem that was not.

In order to solve the above-mentioned problems, the present invention solves the above-mentioned problem by flowing the returned lubricating oil along the inner wall surface of the closed container so as to diffuse the lubricating oil. The present invention is to provide a scroll compressor which is prevented from being discharged to a high efficiency and has high efficiency and excellent durability.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, a scroll compressor according to the present invention comprises a scroll compressor section.
The discharge port of the scroll compressor section is inside the sealed container
The upper high-pressure chamber that opens and the suction port of the scroll compressor
The upper and lower low-pressure chambers are divided into upper and lower sections.
The motor that drives the compressor unit is located and lubricating oil is
A reservoir is provided, and compressed gas is supplied to the scroll compressor from the discharge port.
The lubricating oil separated after being discharged with
The low pressure chamber side opening of the oil return passage returning to the chamber is the inner peripheral wall of the sealed container
It is configured to open obliquely to the surface.
is there.

[0010] Further, in the scroll compressor, the oil is returned.
The passage is composed of a small diameter nozzle or the diameter of the oil return passage
Is set to 0.4 mm or less .

[0011]

According to the present invention, the lubricating oil is caused to flow along the closed container by the above structure, and the returned lubricating oil is again discharged from the high-pressure chamber through the discharge pipe into the refrigeration cycle, thereby lowering the efficiency of the heat exchanger. The compression efficiency can be improved by preventing the lubricating oil from being supplied to the compression mechanism and preventing the lubricating oil from being insufficiently supplied.

Further, heat can be radiated from the sealed container, and the suction loss can be reduced. Further, the diameter of the oil return passage is set to 0.
By setting the thickness to 4 mm or less, it is possible to prevent the compressed gas from passing through the oil return passage when the amount of the lubricating oil is small and passing through the space of the suction passage to lower the compression efficiency.

[0013]

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

FIG. 1 is a longitudinal sectional view of a scroll compressor according to a first embodiment of the present invention, and FIG. 3 is a longitudinal sectional view of a scroll compressor according to a second embodiment of the present invention.

In FIG. 1, reference numerals 1 and 2 denote a closed container, and 3 denotes a spacer. And a low-pressure chamber 6.

An orbiting scroll 11 is provided in an eccentric hole 10 of a drive shaft 9 supported by a frame 7 and driven by an electric motor 8.
Are arranged by engaging rotation-preventing parts, and constitute a compressor unit 13 together with the fixed scroll 12 engaged with the rotation preventing parts.

A discharge space 14 formed by the closed container 1, the spacer 3, and the fixed scroll 12 communicates with an external piping system through a discharge pipe 15 provided in the closed case 1, and a lubricating oil 16 is provided at the bottom of the low-pressure chamber 6. The drive shaft 9 has a lubricating oil supply device 17 and the lower end is buried in the lubricating oil 16. Wherein the spacer 3, the discharge due to the pressure difference the lubricating oil 18 accumulated in the space 14 is provided an oil return passage 19 back into the low pressure chamber 6 side, the inner wall open end 20 of the low pressure chamber 6 side of the closed container 2
It is arranged so that it opens obliquely to the surface
is there.

FIG . 3 shows a configuration in which the oil return passage 19 is constituted by a small-diameter nozzle 21, and the opening end of the low-pressure chamber 6 side is formed on the inner wall surface of the closed vessel 2 .
It is arranged so as to open obliquely with respect to .

[0019]

As described above, the present invention provides an oil return passage for returning lubricating oil to the low pressure chamber side, and further allows the lubricating oil to flow from the compression space to the refrigeration cycle by flowing the lubricating oil along the closed container. To prevent the efficiency of the heat exchanger from lowering, and to eliminate the shortage of lubricating oil to the compressor section.

At the same time, the compression efficiency can be improved by radiating heat from the closed container and reducing the suction loss.

Further, by setting the diameter of the oil return passage to 0.4 mm or less, it is possible to prevent the compressed gas from flowing into the low-pressure chamber through the oil return hole, and to prevent a decrease in compression efficiency.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a scroll gas compressor according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional scroll compressor having an oil return passage in contact with a closed container .

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

FIG. 4 is a cross-sectional view of a scroll compressor having different conventional oil return passages.

FIG. 5 is a sectional view of a scroll compressor having different conventional oil return passages.

[Explanation of symbols]

 Reference numerals 1 and 2 Closed container 3 Spacer 5 High pressure chamber 6 Low pressure chamber 7 Frame 8 Electric motor 9 Drive shaft 11 Orbiting scroll 12 Fixed scroll 13 Compressor unit 14 Discharge space 16 Lubricating oil 17 Lubricating oil supply device 18 Lubricating oil 19 Oil return passage 20 Opening End 21 Small diameter nozzle

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-75795 (JP, A) JP-A-59-141793 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 18/02 311

Claims (3)

(57) [Claims] An airtight container accommodating a scroll compressor unit.
High pressure inside the discharge opening of the scroll compressor is open inside
Low-pressure chamber communicating with the chamber and the suction port of the scroll compressor
And a scroll compressor section in the low-pressure chamber.
A motor to be driven is arranged and a lubricating oil sump is provided at the bottom.
The scroll compressor discharges with compressed gas from the discharge port.
Return the separated lubricating oil from the high pressure chamber to the low pressure chamber
A scroll compressor having an oil return passage, wherein the oil
The return passage has an opening at the low-pressure chamber side facing the inner peripheral wall of the closed vessel.
A scroll characterized by being open at an angle
Compressor. (2) The oil return passage is composed of a small-diameter nozzle.
The scroll compressor according to claim 1, wherein (3) The hole diameter of the oil return passage is 0.4 mm or less.
The scroll according to claim 1 or 2, wherein
Compressor.