Hermetic-type compressor and refrigeration cycle apparatus

Patent metadata

Field	Value
Publication number	US-9745980-B2
Application number	US-201214348553-A
Country	US
Kind code	B2
Filing date	Sep 20, 2012
Priority date	Sep 29, 2011
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A compression mechanism portion housed in a closed case is provided with a partition plate located between a first cylinder and a second cylinder. The compression mechanism includes a first bearing discharge port formed to a first bearing and a first partition plate discharge port formed to the partition plate as discharge ports for discharging working fluid compressed in a first cylinder chamber, and also includes, as discharge port for discharging working fluid compressed in a second cylinder chamber, a second bearing discharge port formed to a second bearing and a second partition plate discharge port formed to the partition plate. A cross-sectional area of the first partition plate discharge port is formed to be smaller than a cross-sectional area of the first bearing discharge port, and a cross-sectional area of the second partition plate discharge port is formed to be smaller than a cross-sectional area of the second bearing discharge port.

First claim

The invention claimed is:

1. A hermetic type compressor comprising a closed case, a motor portion which is housed in the closed case, and a compression mechanism portion which is housed in the closed case and is driven by a rotating shaft coupled to the motor portion so as to compress a working fluid,
the compression mechanism portion including a first bearing, a first cylinder, a partition plate, a second cylinder, and a second bearing, which are provided in order along an axial direction of the rotating shaft, and having a first cylinder chamber formed in the first cylinder closed at two ends by the first bearing and the partition plate so as to compress the working fluid and a second cylinder chamber formed in the second cylinder closed at two ends by the partition plate and the second bearing so as to compress the working fluid, in which the working fluid compressed in the first cylinder chamber and the working fluid compressed in the second cylinder chamber are discharged into a space in the closed case, wherein
an in-partition-plate space which communicates with the space in the closed case is formed inside the partition plate,
the compressor is provided, as discharge ports through which the working fluid compressed in the first cylinder chamber is discharged into the space in the closed case, with a first bearing discharge port formed in the first bearing and a first partition plate discharge port formed in the partition plate,
the compressor is provided, as discharge ports through which the working fluid compressed in the second cylinder chamber is discharged into the space in the closed case, with a second bearing discharge port formed in the second bearing and a second partition plate discharge port formed in the partition plate, and
a cross-sectional area of the first partition plate discharge port is formed to be smaller than a cross-sectional area of the first bearing discharge port, and a cross-sectional area of the second partition plate discharge port is formed to be smaller than a cross-sectional area of the second bearing discharge port.

2. The hermetic-type compressor according to claim 1 , wherein
the rotating shaft has eccentric portions, which are located in the first and second cylinder chambers, have centers deviating from a rotation center of the rotating shaft, rollers are fitted to outer peripheral portions of the eccentric portions, and an inter-eccentric-portion coupling portion, which is located between the eccentric portions, and has a center coincident with the rotation center of the rotating shaft,
the partition plate is formed by coupling a plurality of divisional plates divided along the axial direction of the rotating shaft, the partition plate having an insertion portion in which the inter-eccentric-portion coupling portion is inserted, and the inter-eccentric-portion coupling portion is formed in a solid cylinder shape having a radius dimension “Rj” larger than “Dp-Rc-e” and smaller than “Dp/2,” where “Rc” is a radius dimension of each of the eccentric portions, “Dp” is an inner diameter dimension of the insertion portion, and “e” is an eccentricity which is a distance from the rotation center of the rotating shaft to the center of each eccentric portion, and
escape portions, which provide a shape not protruding in outer peripheral directions from the eccentric portions and have dimensions along the axial direction of the rotating shaft which are smaller than a thickness dimension of the partition plate, are formed at portions facing the eccentric portions of an outer peripheral portion of the inter-eccentric-portion coupling portion.

3. The hermetic-type compressor according to claim 1 , wherein a discharge valve which opens or closes the first partition plate discharge port has a maximum degree of opening that is set to be smaller than a maximum degree of opening of a discharge valve which opens or closes the first bearing discharge port, and a discharge valve which opens or closes the second partition plate discharge port has a maximum degree of opening is set to be smaller than a maximum degree of opening of a discharge valve which opens or closes the second bearing discharge port.

4. The hermetic-type compressor according to claim 1 , wherein
the first cylinder is arranged above the second cylinder,
a first muffler chamber which communicates with the first bearing discharge port and a second muffler chamber which communicates with the second bearing discharge port are provided,
a first discharge passage communicating the in-partition-plate space and the first muffler chamber with each other and a second discharge passage communicating the in-partition-plate space and the second muffler chamber with each other are provided, and
a cross-sectional area of the first discharge passage is formed to be larger than a cross-sectional area of the second discharge passage.

5. The hermetic-type compressor according to claim 1 , wherein the partition plate is formed by coupling two divisional partition plates divided along the axial direction of the rotating shaft, a positioning member having two protruding ends is provided at one of the divisional partition plates, and engagement portions to be engaged with the positioning member are formed at another one of the divisional partition plates and the first cylinder or the second cylinder.

6. The hermetic-type compressor according to claim 2 , wherein the escape portions are formed on a side where the motor section is attached and a side opposite to the first mentioned side along the axial direction of the rotating shaft, and the dimensions along the axial direction of the rotating shaft of the escape portions are formed such that the dimension of one of the escape portions located on the side where the motor section is attached is larger than the dimension of another one of the escape portions located on the side opposite to the first mentioned side.

7. A refrigerant cycle apparatus comprising a hermetic-type compressor according to claim 1 , a condenser which is connected to the hermetic-type compressor, an expansion device which is connected to the condenser, and an evaporator which is connected between the expansion device and the hermetic-type compressor.

8. The hermetic-type compressor according to claim 2 , wherein a discharge valve which opens or closes the first partition plate discharge port has a maximum degree of opening that is set to be smaller than a maximum degree of opening of a discharge valve which opens or closes the first bearing discharge port, and a discharge valve which opens or closes the second partition plate discharge port has a maximum degree of opening is set to be smaller than a maximum degree of opening of a discharge valve which opens or closes the second bearing discharge port.

9. The hermetic-type compressor according to claim 2 , wherein
the first cylinder is arranged above the second cylinder,
a first muffler chamber which communicates with the first bearing discharge port and a second muffler chamber which communicates with the second bearing discharge port are provided,
a first discharge passage communicating the in-partition-plate space and the first muffler chamber with each other and a second discharge passage communicating the in-partition-plate space and the second muffler chamber with each other are provided, and
a cross-sectional area of the first discharge passage is formed to be larger than a cross-sectional area of the second discharge passage.

10. The hermetic-type compressor according to claim 3 , wherein
the first cylinder is arranged above the second cylinder,
a first muffler chamber which communicates with the first bearing discharge port and a second muffler chamber which communic

Assignees

• Toshiba Carrier Corp

Inventors

• Hirayama Takuya

Classifications

• F04C29/065 Primary

  Noise dampening volumes, e.g. muffler chambers · CPC title

• F04C28/24

  characterised by using valves controlling pressure or flow rate, e.g. discharge valves {or unloading valves}(F04C28/10 takes precedence) · CPC title

• F25B1/005

  of the single unit type (F25B1/10 takes precedence) · CPC title

• F04C29/12

  Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet · CPC title

• F04C2240/60

  Shafts · CPC title