JPS5923094A - Enclosed type motor driven compressor - Google Patents

Abstract

PURPOSE:To prevent intrusion of oil at the bottom of an enclosed container into a suction pipe positively when operation of a compressor is stopped, by keeping the pressure in an enclosed space between a fixed scroll and a revolving scroll higher than the suction pressure by leaking a part of pressure in a discharge chamber into said enclosed space between the fixed scroll and the revolving scroll. CONSTITUTION:When operation of a compressor is stopped and a valve plate 24C of a check valve 24 comes into tight contact with a seat surface 24B, part of high-pressure gas in a discharge chamber 11 is leaked into an enclosed space 4 formed between a fixed scroll 2 and a revolving scroll 3 via a small hole 24E formed in the valve plate 24C and a discharge port 10. Since, with such an arrangement, the gas in the discharge chamber 11 flows back into the enclosed space 4 and pressure in the enclosed space 4 becomes higher than the suction pressure, it is enabled to prevent oil (not shown) at the bottom of an enclosed container from entering into a suction pipe (not shown).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hermetic electric compressor. FIG. 1 shows a conventional hermetic electric compressor] In a hermetically sealed container 1, a one-line machine section C and an electric motor section M are housed. The compressor section C is
A fixed scroll 2 having a spiral wrap 2A and an orbiting scroll 3 having a spiral wrap 3A on a flat plate,
Both scrolls 2.3 are wrapped around each other 2A, 3. The scrolls 2 and 3 are assembled with A on the inside, and the closed space 4 formed between both scrolls 2 and 3 is configured to decrease in volume as it moves toward the center of the scroll due to the orbiting motion of the orbiting scroll 3. The three orbiting scrolls are held between the fixed scroll 2 and the frame 5. Further, the orbiting scroll 3 performs an orbiting motion relative to the fixed scroll 2 while being prevented from rotating by the Oldham key 7 and the Oldham ring 8 as the crankshaft 6 driven by the electric motor section M rotates. The compressor section C confines the suction gas flowing from the suction pipe 9 provided on the outer periphery of the fixed scroll 2 due to the orbiting movement of the orbiting scroll 3 into an airtight container 4 between both scrolls, so that the airtight space 4 is The suction gas is compressed by decreasing its volume as it moves toward the center, and is discharged into the discharge chamber 11 in the closed container 1 through the discharge hole 10 provided at the center of the identification scroll 2 . On the other hand, oil supply holes 12 and 13 are provided in the crankshaft 6 and the orbiting scroll 3, respectively, and oil 14 at the bottom of the closed container 1 is supplied to the orbiting scroll 3 through the oil supply holes 12 and 13. 2 and the sliding surfaces between the orbiting scroll 3 and the frame 5. During operation, the oil supplied to each of the sliding surfaces flows into the sealed space 4. It is discharged into the discharge chamber 11 together with the compressed gas.

A check valve 14 is installed in the discharge port 10 to prevent the gas in the discharge chamber 11 from flowing back into the closed space 4 when the operation is stopped. This check valve 14 has a structure in which when the operation is stopped and no pressure is generated in the discharge port 10, the valve body 14A comes into close contact with the seat surface and completely blocks off the discharge chamber 11 and the closed space 4. There is.

However, in the hermetic electric compressor described above, when the operation is stopped, the check valve 14 completely blocks off the discharge chamber 11 and the hermetic space 1i-i14 between the scrolls 2.3, and Since the pressure inside the space 4 is opposite to the suction pressure, the oil at the bottom of the closed container 1 flows into the oil supply hole 1 of the crankshaft 6.
2. There is a risk that the oil may flow into the suction pipe 9 through the oil supply hole 13 of the orbiting scroll 3 and the sealed space 4.

The purpose of the present invention is to eliminate the above-mentioned problems by leaking a part of the pressure in the discharge chamber between the sealed chambers during operation stoppage, thereby reducing the pressure in the sealed air LljJ to 1 lower than the suction pressure.
Our object is to provide a sealed electric pressure &i@ that can reliably prevent oil at the bottom of a sealed container from flowing into the suction pipe.

In order to achieve this object, the present invention-1 includes a fixed scroll having a spiral wrapper and an orbiting scroll having a spiral wrap on a flat plate, and both scrolls are combined with each other with their wraps inside, and the orbiting A compressor section configured to reduce the volume of the closed space formed between both scrolls by the orbiting motion of the scroll as it moves in the direction of the central force of the scroll, and a compressor section configured to rotate the orbiting scroll via a crankshaft. 4. The electric motor section is housed in a sealed container, and a discharge hole is provided in the center t111 of the fixed scroll to discharge the gas compressed by the sealed space into a discharge chamber in the sealed container. A check valve is installed in the discharge hole to prevent the gas in the discharge chamber from flowing backwards when the operation is stopped, and the oil supply hole at the bottom of the closed container is provided with V to supply oil to the sliding surfaces of the orbiting scroll and fixed scroll.
(- In the hermetic electric compressor, the check valve is connected to the note surface formed around the front valve discharge hole, and when pressure is generated in the discharge hole, the sheet blood scum separates and the pressure disappears. The valve plate is characterized by having a structure including a valve plate that is in close contact with the seat surface, and an opening that causes deflection when the shaped valve plate is in close contact with the seat surface.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. Figure 2 shows a cross-sectional view of the check valve access part in the hermetic electric compressor of the present invention, in which 2 is a fixed scroll, 2 is the wrap of the identification scroll 2, 3 is an orbiting scroll, and 38 is an orbiting scroll. 3 is a wrap, 4 is a closed space, 10 is a discharge hole provided in the medium heat of fixed scroll 2, 11
indicates the discharge chamber. Reference numeral 24 denotes a check valve provided in the discharge hole 10 to prevent the gas in the discharge chamber 11 from flowing back into the closed space 4 when the operation is stopped. When pressure is generated in the discharge hole 10, the annular valve housing 24A and the seat surface 24B formed around the discharge hole 10 separate from the seat surface 24B.
In addition, when the pressure is removed, the valve plate 24C that comes into close contact with the seat surface 24■3 and the valve body 2 that is attached to the inside of the valve housing 24A
clip 241] and the valve body 2
4C].

1 to 1 (C) When the closed type electric compressor of the present invention is washed, when the operation is stopped and the valve plate 24c of the check valve 24 comes into close contact with the vent surface 24B, 2. Hole 24
1) A part of the high-pressure waste in the discharge chamber 11 is transferred to the identification scroll 2 and the orbiting scroll 3 through the discharge hole 10.
The seal between the two leaks in between 4 and 4. In other words, the density 1″i
Since the gas in the 4VL knee discharge chamber 11 flows backward and the pressure in the sealed space 4 is higher than the suction pressure, oil at the bottom of the closed container does not flow into the suction pipe.

Figure 3-5 This is a check valve without other embodiments, with valve plate 2
Instead of the small hole 24E provided in the seat surface 24B, one notch groove 24D is provided in the seat surface 24B, and a plurality of (four in the figure) cutout grooves 24D are provided, so that when the valve plate 24C is in close contact with the seat surface 24B, the discharge chamber The structure is such that gas No. 11 leaks into the sealed space 4 through the notch groove 24F.

- Still, in the present invention, the valve plate 24 is referred to as a check valve.
A small hole 24E is provided in C, and a cutout groove 2 is provided in the seat surface 24B.
A configuration including 4F may also be used.

As explained above, according to the present invention, when the operation is stopped, a part of the pressure in the discharge chamber is leaked into the closed space between the fixed scroll and the orbiting scroll.
Since the pressure in the -1 space can be maintained higher than the suction pressure, oil at the bottom of the closed container can be reliably prevented from flowing into the suction pipe.

[Brief explanation of the drawing]

@ Figure 1 is a cross-sectional view showing a conventional hermetic electric compressor, Figure 2 d5 is a cross-sectional view of a check valve receiving part showing an embodiment of the present invention,
FIG. 3 shows another example of the check valve according to the present invention, (a)
is a plan view thereof, (bl is a cross-sectional view) C...Compressor section M...Electric motor section 1...Airtight container 2...
Fixed scroll 3... Orbiting scroll 2A,
3A... Lug 4... Sealed space 6... Crankshaft 10... Discharge hole 11... Discharge chamber 1
2.13... Oil supply hole 24... Check plate 24B...
・Seat surface 24C...Valve plate 24E...Small hole 24F...Notch groove

Claims (1)

[Claims] 1. A fixed scroll having a spiral wrap and an orbiting scroll having a spiral wrap on a flat plate are provided, and both scrolls are combined with each other with the wraps inside, and the orbiting scroll has an orbiting motion. A compressor section configured to reduce the volume of the sealed space formed between both scrolls as it moves toward the center of the scroll, and an electric motor section that makes the orbiting scroll orbit through a crankshaft are sealed. It is stored in a container, and in the center of the fixed scroll,
A discharge hole is provided for discharging the gas compressed by the sealed space into a discharge chamber in the closed container, and the discharge hole is provided with a check valve that prevents the gas in the discharge chamber from flowing back when the operation is stopped. In a hermetic electric compressor configured to supply oil from the bottom of a hermetic container to the sliding surfaces of an orbiting scroll and a fixed scroll through an oil supply hole bored in a crankshaft and an orbiting scroll, the check valve is , a seat surface formed around the chest circumference of the discharge hole, a valve plate that separates from the seat surface when pressure is generated in the discharge hole, and comes into close contact with the seat surface when the pressure is removed; A hermetic electric compressor characterized by having a structure including an opening that causes leakage when the check valve is in close contact with the air compressor. 2. The opening that causes leakage in the check valve includes:
The hermetic electric compressor 3 according to claim 1, wherein the opening that causes leakage in the check valve is a small hole bored in a valve body, and the opening that causes leakage in the check valve is a notched groove provided in the seat surface. A hermetic electric compressor according to claim 1, characterized in that: 4. The opening that causes leakage in the check valve is
The hermetic electric compressor according to claim 1, characterized in that the compressor comprises a small hole bored in the valve body and a cutout groove provided in the seat surface.