HEAT PUMP SYSTEM, METHOD FOR ADJUSTING TEMPERATURE OF LUBRICATING WATER IN HEAT PUMP SYSTEM, AND METHOD FOR OPERATING HEAT PUMP SYSTEM

Abstract

A heat pump system, a method for adjusting a temperature of lubricating water in a heat pump system, and a method for operating a heat pump system, which suppress boiling of lubricating water for bearings and thereby minimize the deterioration in reliability of the bearings. A heat pump system comprising an evaporator 43 for generating steam, and a compressor 34 including a first stage 33 and second stage 32 as a plurality of compression mean for compressing the steam, wherein bearings 51 for supporting the compressor 34 are water bearings, and lubricating water in each of the water bearings 51 is controlled to a temperature less than a saturation temperature associated with an internal pressure of each water bearing 51.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a configuration diagram of a heat pump system according to a embodiment of the present invention.

FIG. 2 shows a configuration diagram of a heat pump system according to a embodiment of the present invention.

FIG. 3 shows a configuration diagram of a heat pump system according to a embodiment of the present invention.

FIG. 4 shows a configuration diagram of a heat pump system according to a embodiment of the present invention.

FIG. 5 shows an enlarged view of bearings in a heat pump system of the present invention.

FIG. 6 shows a configuration diagram of a heat pump system according to a embodiment of the present invention.

Claims

1. A heat pump system comprising an evaporator for generating steam and a plurality of compression means for compressing the steam, wherein bearings for supporting said plurality of compression means are water bearings, andlubricating water in each of said water bearings is controlled to a temperature less than a saturation temperature associated with an internal pressure of each water bearing.

2. A heat pump system comprising an evaporator for evaporating water by heat exchange with a heat source and a plurality of compression means for increasing a temperature and pressure of the steam generated in said evaporator, wherein a lubricant for bearings adapted to support said plurality of compression means is water, andboiling of the water during lubrication of the bearings is prevented.

3. A heat pump system comprising an evaporator for generating steam and a plurality of compression means for compressing the steam, wherein bearings for supporting said plurality of compression means are water bearings,a temperature-measuring device for measuring a temperature of lubricating water for each of said water bearings is provided on a lubricating water line, andthe temperature measured by said temperature-measuring device is controlled below a preset temperature for the lubricating water.

4. A heat pump system comprising an evaporator for generating steam and a plurality of compression means for compressing the steam, Wherein bearings for supporting said plurality of compression means are water bearings,a temperature-measuring device for measuring a temperature of lubricating water for each of said water bearings is provided on a lubricating water line, anda temperature of a location at which the temperature of the lubricating water is measured by said temperature-measuring device is controlled below a temperature calculated by subtracting from a preset temperature for the lubricating water, a temperature rise during lubrication of the bearings.

5. The heat pump system according to claim 3, wherein said temperature-measuring device is provided on a lubricating water drain line.

6. The heat pump system according to claim 3, wherein the heat pump system comprises a flow path for supplying the lubricating water for said water bearings to said evaporator.

7. The heat pump system according to claim 3, wherein an atmosphere pressure of each of said water bearings is an atmospheric pressure, and all water supplied to each of said water bearings is supplied from a water supply source outside the system.

8. The heat pump system according to claim 3, wherein the heat pump system comprises a cooling device for cooling the lubricating water before supplying to said water bearings.

9. The heat pump system according to claim 8, wherein the heat pump system comprises a line for supplying water in said evaporator to said cooling device.

10. The heat pump system according to claim 3, wherein said water bearings and said plurality of compression means are hermetically enclosed in a casing.

11. The heat pump system according to claim 10, wherein an atmosphere pressure of each of said water bearings is controlled to be sufficiently higher than a pressure of main streams of the steam compressed by a compressor in the vicinity of each of said water bearings.

12. The heat pump system according to claim 8, wherein said cooling device is an ejector, and steam ejected from said ejector is supplied to heat-utilizing equipment.

13. The heat pump system according to claim 8, wherein an atmosphere pressure of each of said water bearings is an atmospheric pressure, said cooling device utilizes depressurization boiling of water, and during a rated operation of said plurality of compression means, an internal pressure of said cooling device is equal to or less than 0.16 atmospheres.

14. A method for adjusting a temperature of lubricating water in a heat pump system which comprises an evaporator for generating steam, a plurality of compression means for compressing the steam, water bearings for supporting said plurality of compression means, and a cooling device for cooling the lubricating water supplied to each of said water bearings, wherein said cooling device utilizes depressurization boiling of water, andthe method comprises steps of controlling an internal pressure of said cooling device and thereby adjusting a temperature of the lubricating water in said cooling device.

15. A method for operating a heat pump system which comprises an evaporator for generating steam and a plurality of compression means for compressing the steam, wherein bearings for supporting said plurality of compression means are water bearings,a temperature-measuring device for measuring a temperature of lubricating water for each of said water bearings is provided on a lubricating water line, andthe method comprises step of controlling the temperature measured by said temperature-measuring device below a preset temperature for the lubricating water.