Heat pump

Patent metadata

Field	Value
Publication number	US-10495325-B2
Application number	US-201515528009-A
Country	US
Kind code	B2
Filing date	Nov 18, 2015
Priority date	Nov 21, 2014
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

An outdoor unit of the heat pump includes a compressor, an oil separator provided in a discharge path of the compressor, an outdoor-unit connecting pipe connecting an intake path of the compressor and an outdoor unit of an another heat pump for supplying a refrigerant to the outdoor unit of the another heat pump, an oil supply pipe extending from a predetermined position of the oil separator and connecting to the outdoor-unit connecting pipe, an on-off valve provided on the oil supply pipe, an expansion valve provided in a portion of the outdoor-unit connecting pipe between a connecting part connected to the intake path and a connecting part connected to the oil supply pipe, and a refrigerant filling port provided in a portion of the outdoor-unit connecting pipe between the connecting part and the expansion valve.

First claim

The invention claimed is:

1. A heat pump system comprising;
a first heat pump; and
a second heat pump,
wherein the first heat pump includes a first outdoor unit, the first outdoor unit including:
a compressor,
an oil separator provided in a discharge path of the compressor,
an outdoor-unit connecting pipe connecting an intake path of the compressor and a second outdoor unit of the second heat pump for supplying a refrigerant to the second outdoor unit of the second heat pump,
an oil supply pipe extending from a predetermined position of the oil separator to the outdoor-unit connecting pipe,
an on-off valve provided on the oil supply pipe,
a first expansion valve provided in a portion of the outdoor-unit connecting pipe between a first connecting part connected to the intake path and a second connecting part connected to the oil supply pipe, and
a refrigerant filling port provided in a portion of the outdoor-unit connecting pipe between the second connecting part and the first expansion valve.

2. A heat pump system comprising;
a first heat pump; and
a second heat pump,
wherein the first heat pump includes a first outdoor unit and a first indoor unit, the first outdoor unit including:
a compressor,
an oil separator provided in adischargepathofthe compressor,
a refrigerant filling pipe connected to an intake path of the compressor and a second outdoor unit of the second heat pump for filling the intake path of the compressor with a refrigerant supplied from the second outdoor unit of the second heat pump,
an oil supply pipe extending from a predetermined position of the oil separator and connecting to the refrigerant filling pipe,
an on-off valve provided on the oil supply pipe,
an expansion valve provided in a portion of the refrigerant filling pipe between a first connecting part connected to the intake path and a second connecting part connected to the oil supply pipe, and
a refrigerant filling port provided in a portion of the refrigerant filling pipe between the second connecting part connected to the oil supply pipe and the expansion valve.

3. The heat pump system of claim 2 , wherein the refrigerant filling pipe is further configured to supply the refrigerant to the second outdoor unit of the second heat pump.

4. The heat pump system of claim 1 , wherein the oil supply pipe is configured to provide oil from the oil separator to the second heat pump via the outdoor-unit connecting pipe.

5. The heat pump system of claim 1 , wherein the first connecting part is an intersection of the outdoor-unit connecting pipe and the intake path.

6. The heat pump system of claim 5 , wherein the second connecting part is an intersection of the outdoor-unit connecting pipe and the oil supply pipe.

7. The heat pump system of claim 6 , wherein the first connecting part is disposed between a heat exchanger provided on the intake path and a second expansion valve provided on the intake path.

8. The heat pump system of claim 1 , further comprising a connecting pipe that connects the outdoor-unit connecting pipe to the second outdoor unit.

9. The heat pump system of claim 8 , further comprising a manual on-off valve provided on the outdoor-unit connecting pipe between the refrigerant filling port and the connecting pipe.

Assignees

• Yanmar Co Ltd

Inventors

• Okada Hideshi
• Okuda Norihiro
• Yoshimura Tomoya

Classifications

• F25B2313/006

  two pipes connecting the outdoor side to the indoor side with multiple indoor units · CPC title

• F25B31/004

  oil recirculating arrangements · CPC title

• F25B2313/0253

  in parallel arrangements · CPC title

• F25B2313/0233

  in parallel arrangements · CPC title

• F25B13/00

  Compression machines, plants or systems, with reversible cycle (defrosting cycles F25B47/02) · CPC title