JP2008031913A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor capable of shutting off flow of oil to an outside of a hermetic vessel and reducing oil discharge quantity to the outside of the hermetic vessel in a process of flow of oil filled in the hermetic vessel. <P>SOLUTION: In a hermetic compressor comprising an electric element and a compression element in a hermetic vessel, an insulation plate of a donut shape having a hollow center part is provided above the electric element at an upper part of an inside of the hermetic vessel, and the insulating plate is formed with keeping a relation of hollow part diameter dimension A and rotor outer diameter dimension B under an inequality A<B. Consequently, a flow path of oil discharged to the outside of the hermetic vessel in the process of flow of oil filled in the hermetic vessel and discharge quantity of oil to the outside of the hermetic vessel can be reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure of a hermetic compressor including an electric element and a compression element in a hermetic container, and in particular, a discharge structure provided for discharging refrigerant gas in the hermetic container to the outside of the hermetic container. It is about.

  As a conventional hermetic compressor, there has been one disclosed in Patent Document 1, for example. As shown in Patent Document 1, an electric element is arranged in the upper part of the sealed container, and a compression element is arranged in the lower part. The electric element is connected to a rotating shaft constituting the compression element and rotates, and this rotor It is comprised with the stator fixed to the internal peripheral surface of the airtight container which rotates. The compression element is provided with an annular hollow cylinder and an upper bearing, an intermediate partition plate, and a lower bearing that support the rotating shaft, and the upper and lower end surfaces of the cylinder are sandwiched between the cylinders. A roller that engages with an eccentric shaft that is also a part of the rotating shaft is provided, and is configured to be eccentrically rotated in the cylinder by driving from the rotor of the electric element, thereby compressing the refrigerant.

Oil is stored in the bottom of the sealed container, and oil stored in the bottom of the sealed container is sucked up by an oil pump (oil supply means) attached to the lower end of the rotating shaft and supplied to the sliding part of the compression element. It is lubricated and sealed. On the other hand, the refrigerant compressed and discharged by the compression element is provided in the upper part of the hermetic container through a notch that forms a gap between the rotor and the stator and an inner wall of the hermetic container provided on the outer periphery of the stator. It is discharged outside from the discharge pipe.
JP-A-5-099172

  However, in the conventional hermetic compressor, oil is dissolved in the refrigerant gas compressed by the compression element, and the oil is also provided in the gap between the rotor and the stator and the outer periphery of the stator together with the refrigerant gas. There is a problem that oil is discharged outside from the discharge pipe provided at the upper part of the closed container through the notch that forms a gap with the inner wall of the container, and the oil discharge amount increases. there were.

  In order to solve the above-described conventional problems, a hermetic compressor according to the present invention includes an electric element and a compression element in a hermetic container. The hermetic compressor has a donut-like shape with a hollow center. A shield plate is provided above the sealed container and above the electric element, and the relationship between the hollow portion diameter A dimension and the rotor outer diameter B dimension of the shield plate is formed as A <B.

  The hermetic compressor of the present invention has the above-described configuration, and when the refrigerant gas is discharged from the discharge pipe provided in the hermetic container, the oil contained in the refrigerant gas is removed by the donut-shaped shielding plate. By separating and discharging only the refrigerant gas from the sealed container, the oil discharge amount can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention.

  As shown in FIG. 1, an electric element 2 is disposed in the upper part of the sealed container 1 and a compression element 3 is disposed in the lower part. The electric element 2 is connected to a rotating shaft 4 constituting the compression element 3 and rotates. 2a and a stator 2b fixed to the inner peripheral surface of the sealed container 1 for rotating the rotor 2a. The compression element 3 is provided with an annular hollow cylinder 5 and an upper bearing 6 and a lower bearing 7 that support the rotating shaft 4 while the upper and lower end surfaces of the cylinder 5 are sandwiched and closed. Inside, a roller 8 that engages with an eccentric shaft 4a that is also a part of the rotating shaft 4 is provided, and the inside of the cylinder 5 rotates eccentrically by driving from the rotor 2a of the electric element 2, and the refrigerant is compressed. It has become.

  Oil 9 is stored at the bottom of the sealed container 1, and the oil 9 stored at the bottom of the sealed container 1 is sucked up by an oil pump (oil supply means) attached to the lower end of the rotary shaft 4 to compress the oil 9. 3 is supplied to the sliding portion for lubrication and sealing. On the other hand, in the electric element 2, the gap 2c between the rotor 2a and the stator 2b, which guides the refrigerant compressed and discharged from the compression element 3 to the discharge pipe 10 provided for discharging from the sealed container 1 to the outside, A donut-like shape having a passage of a notch 2d that forms a gap with the inner wall of the hermetic container 1 provided on the outer periphery of the stator 2b and having a hollow center at the top of the hermetic container 1 and above the electric element 2 The shielding plate 11 is configured such that the relationship between the hollow portion diameter A and the rotor outer diameter B is A <B.

  According to this configuration, when the refrigerant gas is discharged from the discharge pipe 10 provided in the sealed container 1, the gap 2c between the rotor 2a and the stator 2b and the inner wall of the sealed container 1 provided on the outer periphery of the stator 2b The refrigerant gas that passes through the two passages of the notch 2d that forms the gap of the gas and hits the shielding plate 11 having a donut shape together with the refrigerant gas that has passed through the two passages, and only the oil 9 having high viscosity contained in the refrigerant gas is shielded. 11 is separated in the form of adhering to 11, and only the refrigerant gas is discharged from the sealed container 1, whereby the effect of reducing the oil discharge amount can be obtained.

  In addition, although the shape of the hollow part of the shielding board 11 of FIG. 1 of the said embodiment is a circular type thing, it is not limited to this, The same effect is acquired also in a polygonal shape. Can do.

(Embodiment 2)
FIG. 2 is a longitudinal sectional view of a sealed container discharge part of a hermetic compressor according to the second embodiment of the present invention. As shown in FIG. 2, it is set as the structure which formed the inclination 11a in the electric element side direction in the hollow part vicinity area | region of the shielding plate 11 made into the donut shape.

  According to this configuration, it is possible to obtain the same effect as that of the first embodiment, and by providing the slope 11a, the flow of the refrigerant gas can be reliably hit against the shielding plate 11, and the oil in the refrigerant gas 9 separation function also goes up.

  In addition, the shape of the inclination 11a of the shielding board 11 of FIG. 2 of the said embodiment is not limited to this, The same effect can be obtained also in what was inclined by R shape.

  The hermetic compressor of the present invention can be applied to any hermetic compressor regardless of the compression mode.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. The longitudinal cross-sectional view of the airtight container discharge part of the airtight compressor in the 2nd Embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric element 2a Rotor 2b Stator 2c Clearance notch 2d Notch 3 Compression element 4 Rotating shaft 4a Eccentric shaft 5 Cylinder 6 Upper bearing 7 Lower bearing 8 Roller 9 Oil 10 Discharge pipe 11 Shielding plate 11a Inclination

Claims (2)

In a hermetic compressor comprising an electric element and a compression element in a hermetic container, a donut-shaped shielding plate having a hollow center is provided above the electric element and in the upper part of the hermetic container. A hermetic compressor, wherein the relationship between the hollow portion diameter A dimension of the shielding plate and the rotor outer diameter B dimension is A <B. 2. The hermetic compressor according to claim 1, wherein an area near the hollow portion of the shielding plate having a donut shape is inclined toward the electric element side.

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