3results about How to "Reduce high pressure" patented technology

The application discloses a kind of control method, device and multiple connection air conditioners of multiple connection air conditioner, it is related to air conditioning technical field, the control method of the multiple connection air conditioner includes: detecting the load reduction of the indoor unit of multiple connection air conditioner, when the load reduction of indoor unit exceeds preset threshold, the number of the outdoor unit of start-up is detected;When the number of the outdoor unit of start-up is reduced to preset number, the high pressure of the outdoor unit of start-up is monitored, and recorded as first high pressure, the high pressure of the outdoor unit of shutdown is monitored, and recorded as second high pressure;When first high pressure is greater than second high pressure, based on the operating mode of multiple connection air conditioner, first high pressure and second high pressure control the expansion valve of the outdoor unit of shutdown or the expansion valve of the indoor unit of shutdown is opened, to reduce the high pressure of the outdoor unit of start-up.The application can make the refrigerant flow direction of the outdoor unit of start-up side low pressure side when the high pressure of the outdoor unit of start-up is higher, reduce the high pressure of the outdoor unit of start-up side, reduce high pressure protection risk.

The invention discloses a heat pump air conditioning system which comprises a compressor and a heat pump, the four-way reversing valve is connected with the compressor and is configured to change the flow direction of a refrigerant; the indoor heat exchanger is connected with the four-way reversing valve; the outdoor heat exchanger is connected with the four-way reversing valve; the refrigerant storer is configured to store a refrigerant flowing through the refrigerant storer; the first pipeline is configured to connect the outdoor heat exchanger and the indoor heat exchanger; the branch pipeline is configured to be connected with the refrigerant storage and the first pipeline to form a refrigerant flow path; the adjustable on-off device is arranged on the first pipeline, and the adjustable on-off device is configured to adjust the flow of the refrigerant flowing through the refrigerant storage so as to adjust the refrigerant circulation amount in the air conditioning system. According to the air conditioning system, dynamic adjustment of the refrigerant circulation amount can be achieved, so that the requirements of the air conditioning system for the refrigerant amount under different working conditions are met.

This utility model discloses a system for mitigating the pressure rise in a storage tank during the unloading of cryogenic liquid ammonia. The system includes a cryogenic liquid ammonia tank, an unloading pipeline, and a tank group boundary ball valve. One end of the unloading pipeline is connected to a liquid ammonia unloading tanker, which has a built-in temperature detection unit. The other end of the unloading pipeline is connected to the interior of the cryogenic liquid ammonia tank, which includes an outer tank and an inner tank. The tank group boundary ball valve is installed on the unloading pipeline, and one end of the valve is connected in parallel to a first unloading branch pipe and a second unloading branch pipe. A regulating valve is installed on the first unloading branch pipe, which is connected to a lower inlet pipe extending from the inner tank via a flange. The outlet end of the lower inlet pipe is close to the bottom of the inner tank. This system for mitigating the pressure rise in a storage tank during the unloading of cryogenic liquid ammonia utilizes different inlet methods to slow down the pressure rise inside the tank, significantly improving unloading efficiency.