Variable flow single working medium parallel heat exchanger cascade heat pump system
A technology of heat pump system and heat exchanger, which is applied in the direction of compressors with cascaded work, fluid circulation arrangements, lighting and heating equipment, etc., can solve the problems of hard-to-change fluid flow control, complex systems, etc., and achieve convenience Inter-stage energy regulation, simple system structure and high efficiency
Active Publication Date: 2018-07-20
河北航研制冷设备有限公司
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Problems solved by technology
However, since the low-temperature working medium is in a supercritical state at room temperature, an expansion vessel is usually installed at the low-temperature stage, the system is complex and it is difficult to realize variable working medium flow control
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Embodiment 2
[0024] figure 1 It is a schematic diagram of a cascaded heat pump system with a variable flow single working medium in parallel connection of the first heat exchanger and the second heat exchanger of the present invention, including multiple sets of compressor units connected in parallel, a condensing evaporator 6, a first throttle valve 5-1 and The second throttle valve 5-2, each group of compressors includes a compressor 1, a four-way reversing valve 2, a first solenoid valve 3-1, a second solenoid valve 3-2, a third solenoid valve 3-3, and a second solenoid valve 3-3. Four solenoid valves 3-4, the first heat exchanger 4, and the second heat exchanger 7, the exhaust end of the compressor 1 is connected to the first interface 2-1 of the four-way reversing valve, and the compressor suction connected to the third port 2-3 of the four-way reversing valve, and the first solenoid valve 3-1 is connected in parallel with the second solenoid valve 3-2 to the second port of the four-w...
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The invention discloses a cascaded heat pump system with variable flow single working medium parallel heat exchangers. Each group of compressor units in the present invention includes a compressor, a four-way reversing valve, four solenoid valves, a first heat exchanger, and a second heat exchanger. The exhaust end of the compressor is connected to the first interface of the four-way reversing valve. The suction end is connected to the third port of the four-way reversing valve, one end of the first solenoid valve is connected in parallel with one end of the second solenoid valve and then connected to the second port of the four-way reversing valve, and the other end of the first solenoid valve passes through the first heat exchanger After parallel connection with the second port of the condensing evaporator through the first throttle valve, the other end of the second solenoid valve is connected in parallel with the third port of the condensing evaporator, and the third solenoid valve and the fourth solenoid valve are connected in parallel and then connected to the four-way The reversing valve is connected to the fourth port, the other end of the third solenoid valve is connected in parallel to the first port of the condensing evaporator, and the other end of the fourth solenoid valve is connected in parallel to pass through the second heat exchanger, the second throttle valve and the first port of the condensing evaporator. Four interface connection. The cascaded heat pump system of the present invention is composed of a single working medium without expansion vessels and other devices, and the system structure is simple.
Description
technical field [0001] The invention relates to a heat pump unit, more specifically, to a multi-head cascade heat pump cycle system, which is used to improve the efficiency of the cascade heat pump system and to regulate the flow rate of the heat pump system. Background technique [0002] The single-stage compression heat pump system is not suitable for heat pump systems with a compression ratio (ratio of exhaust pressure to suction pressure) greater than 12 due to the limitation of the suction and discharge compression ratio of the compressor. In the prior art, when the compression ratio is greater than 12, a two-stage compression heat pump system is usually used. The two-stage compression heat pump unit can be driven by a motor, or it can be realized by combining multiple heads. However, the high and low pressure of these two methods are interoperable, and the oil return problem of the compressor is not easy to solve. [0003] Cascade heat pump systems are also a good so...
Claims
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IPC IPC(8): F25B7/00F25B41/04F25B41/20
CPCF25B7/00F25B2600/25F25B41/20
Inventor杨永安陆佩强栗琼琼贺锦开
Owner河北航研制冷设备有限公司