JP2008038915A5

JP2008038915A5 -

Info

Publication number: JP2008038915A5
Application number: JP2007248886A
Authority: JP
Filing date: 2007-09-26
Publication date: 2010-03-25
Anticipated expiration: 2027-04-24

Claims

An airtight container whose bottom is used as an oil reservoir;
A compression mechanism disposed in the sealed container so as to be located above or below the oil level of the oil stored in the oil reservoir;
An expansion mechanism disposed in the sealed container so that the positional relationship with respect to the oil level is upside down from the compression mechanism;
A shaft connecting the compression mechanism and the expansion mechanism;
An oil pump that is disposed between the compression mechanism and the expansion mechanism, and supplies oil filling the periphery of the compression mechanism or the expansion mechanism to the compression mechanism or the expansion mechanism located above the oil level;
With
The shaft includes a compression mechanism side shaft that is connected to the compression mechanism, and an expansion mechanism side shaft that is connected to the expansion mechanism, and the compression mechanism side shaft and the expansion mechanism side shaft are coupled by male and female couplings,
Inside the shaft, an oil supply path that leads to one sliding portion located above the oil level of the compression mechanism and the expansion mechanism is formed to extend in the axial direction,
An expander-integrated compressor, wherein an inlet for feeding oil discharged from the oil pump into the oil supply passage is provided on an outer peripheral surface of the compression mechanism side shaft or the expansion mechanism side shaft.

An electric motor that is disposed between the compression mechanism and the expansion mechanism and that rotationally drives the shaft;
The oil pump is disposed between the electric motor and the compression mechanism, or between the electric motor and the expansion mechanism,
The expander-integrated compressor according to claim 1, wherein an amount of oil in which the rotor of the electric motor is located above the oil level is stored in the sealed container.

The oil pump is disposed adjacent to the pump body and configured to pump oil by increasing or decreasing the volume of the working chamber accompanying rotation of the shaft, and the oil discharged from the pump body A pump housing in which an oil chamber for temporary storage is formed;
The oil discharged from the pump main body is sent to the oil supply passage formed inside the shaft by exposing the shaft to the oil chamber of the pump housing. An expander integrated compressor.

The expander-integrated compressor according to claim 3, wherein the pump main body is a rotary type having an inner rotor attached to the shaft and an outer rotor that forms a working chamber between the inner rotor and the inner rotor.

The pump housing includes an inner wall portion that divides a space in which the pump main body is disposed and the oil chamber along an axial direction of the shaft,
The expander-integrated compressor according to claim 3, wherein a communication hole is formed in the inner wall portion so that one end forms a discharge port of the pump body and the other end opens into the oil chamber.

Partitioning the internal space of the sealed container into an upper space in which one of the compression mechanism and the expansion mechanism is arranged and a lower space in which the other is arranged along the axial direction of the shaft The partition further includes a partition wall in which a communication path is formed to communicate the upper space and the lower space so that movement of oil between the upper space and the lower space is allowed. The expander-integrated compressor described.

While the oil suction passage of the oil pump opens into the lower space,
The oil pump is disposed in the lower space, receives and accumulates oil that has flowed through the communication passage of the partition wall and moved to the lower space, and further, the oil pump sucks the accumulated oil through the oil suction passage. The expander-integrated compressor according to claim 6, further comprising a reserve tank that can be used.

The expander-integrated compressor according to claim 6, wherein an oil suction path of the oil pump opens into the upper space, and oil stored above the partition is sucked into the oil pump.

Of the compression mechanism and the expansion mechanism, the mechanism directly immersed in oil is a rotary type, and the shaft penetrates the rotary type mechanism in the axial direction, while the outer peripheral surface of the shaft is formed from the lower end. The expander-integrated compressor according to claim 1, wherein a groove is formed so as to extend toward a sliding portion of the rotary type mechanism.

2. The expander-integrated compressor according to claim 1, further comprising a second oil pump that supplies the oil to a sliding portion of the compression mechanism and the expansion mechanism that is directly immersed in the oil.