2results about How to "Lower pressure ratio" patented technology

The application provides a composite medium high-temperature heat pump circulation system and method. The composite medium high-temperature heat pump circulation system comprises: a regenerator connected with a separator; a primary compressor connected with a first outlet of the regenerator and used for preliminarily compressing a nitrogen-poor gas-phase working medium; an ejector, an injection inlet of which is connected with an outlet of the primary compressor, and a material inlet of the ejector is connected with a second outlet of the regenerator; a secondary compressor connected with an outlet of the ejector; and a condenser connected with an outlet of the secondary compressor and used for heat exchange, wherein high-temperature hot water or steam generated through heat exchange is directly delivered to a next device; and supercritical fluid discharged from the condenser is returned to the regenerator for heat exchange and then reenters the separator. By introducing appropriate nitrogen into carbon dioxide as an auxiliary component, the temperature rise amplitude of the mixed working medium in the compression process can be effectively improved.

This invention relates to the field of refrigeration equipment technology, specifically to a compressor anti-surge control method and an air conditioner. The compressor anti-surge control method provided by this invention is applied to a refrigeration system, which includes a compressor and a bypass valve connected in parallel with the compressor. The compressor anti-surge control method includes a compressor start-up control method; specifically, the bypass valve is first opened to a first preset opening degree, and then the compressor is started. Under the action of the bypass valve, the high-pressure gaseous refrigerant discharged from the compressor exhaust port is bypassed back to the inlet port. This reduces the rate of pressure increase at the exhaust port while increasing the pressure at the inlet port, thereby reducing the compressor's pressure ratio and ensuring that the compressor's actual output frequency is always greater than the surge frequency at which compressor surge occurs, thus preventing compressor surge. When the compressor speed is greater than or equal to the minimum starting speed, the compressor is considered to have completed starting, and at this time, the bypass valve is closed at a preset closing speed.