Heat pump unit electronic expansion valve control method and heat pump water heater
A technology of electronic expansion valve and heat pump unit, which is applied in the direction of reversible cycle compressors, refrigerators, compressors, etc., which can solve the problems of frequent system fluctuations, inability to adapt to complex working conditions, system safety and unfavorable stable operation, etc. , to achieve the effect of no refrigerant liquid return, protection and reliable operation, and maximum guarantee
Active Publication Date: 2021-01-05
QINGDAO HAIER NEW ENERGY ELECTRIC APPLIANCE
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Problems solved by technology
[0004] In order to solve the problem that the control of the electronic expansion valve of the existing heat pump unit adjusts the working environment with a large temperature difference, if the suction superheat degree control or the exhaust superheat degree control is used alone, it cannot adapt to the complex working condition environment, and it is easy to cause the system to frequently Fluctuation, the technical problem that is unfavorable to the safety and stable operation of the system, a control method for the electronic expansion valve of the heat pump unit is proposed, which can solve the above problems
Method used
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Embodiment 1
[0054] Embodiment 1, in order to solve the problem that the control of the electronic expansion valve of the existing heat pump unit adjusts the working environment with a large temperature difference, if the suction superheat degree control or the exhaust superheat degree control is used alone, it cannot adapt to the complex working condition environment, and it is easy to cause Frequent system fluctuations are unfavorable to the technical problems of system safety and stable operation. This embodiment proposes a heat pump unit electronic expansion valve control method, including the following steps:
[0055] S1. Divide the discharge temperature of the compressor into three control intervals, namely the first control interval, the second control interval, and the third control interval, wherein:
[0056] The first control interval: exhaust temperature Tp
[0057] The second control interval: Tz1≤exhaust temperature Tp
[0058] The third control interval: exhaust te...
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The invention discloses a heat pump unit electronic expanding valve control method. The heat pump unit electronic expanding valve control method includes the following steps that firstly, the exhausttemperature of a compressor is divided into three control intervals which are a first control interval, a second control interval and a third control interval correspondingly; and secondly, the exhaust temperature of the compressor is periodically detected, and the control interval in which the current exhaust temperature is located is judged, wherein a, if the current exhaust temperature is located in the first control interval, the gas sucking overheat degree is adopted for performing control, b, if the current exhaust temperature is located in the second control interval, the exhaust temperature is adopted for performing control, and c, if the current exhaust temperature is located in the third control interval and the lasting time is t1 or above, valve opening is performed for n stepsevery other fixed time. Due to the electronic expanding valve control method, the adjusting relationship is determined according to the water temperature difference and the exhaust temperature difference, the exhaust temperature is limited in a reasonable interval, maximization and rapidity of heating hot water are guaranteed, stability of a system can also be guaranteed, and reliable running of the system is guaranteed.
Description
technical field [0001] The invention relates to the technical field of heat pumps, in particular to a method for controlling an electronic expansion valve of a heat pump unit and a heat pump water heater. Background technique [0002] The electronic expansion valve control mode in the current air-conditioning heat pump is generally suction superheat control or exhaust superheat control, in which the suction superheat control is based on the difference between the suction temperature and the evaporation temperature as the target to adjust the opening of the electronic expansion valve , the exhaust superheat control is to adjust the opening of the electronic expansion valve based on the difference between the exhaust temperature and the condensing temperature as the target, and the inverter will also increase the ambient temperature and compressor frequency as adjustment conditions. These two control modes have advantages and disadvantages. The former uses the effective overhe...
Claims
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IPC IPC(8): F25B13/00F25B49/02
CPCF25B13/00F25B49/02F25B2313/0314F25B2313/0315F25B2600/2513F25B2700/21174F25B2700/21175
Inventor 杜顺祥王建良孙成龙
Owner QINGDAO HAIER NEW ENERGY ELECTRIC APPLIANCE