Judgment method for reversing failure of four-way reversing valve in heat pump unit
A four-way reversing valve, heat pump unit technology, used in refrigerators, refrigeration components, lighting and heating equipment, etc., can solve problems such as condensing pressure exceeding the operating range, poor compressor lubrication, compressor damage, etc., to achieve clear lines. , the implementation is simple, the effect of improving the operation efficiency
Inactive Publication Date: 2015-07-01
NANJING TICA AIR CONDITIONING CO LTD
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Problems solved by technology
[0003] According to the above control method, if the four-way reversing valve fails to reversing during the heating operation of the heat pump unit, the heat pump unit will actually operate in the cooling mode, resulting in the cooling and condensation heat exchange effect of the heat source side of the heat pump unit being too strong. The condensing pressure exceeds the operating range of the compressor, resulting in poor lubrication of the compressor and a large amount of liquid return
If the protection and control cannot be carried out in time, the compressor will be easily damaged after the heat pump unit has long-term poor lubrication and liquid return operation.
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[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0013] like figure 1 As shown, it is a working flow chart of the method for judging the reversing failure of the four-way reversing valve in the heat pump unit according to the present invention. When the heat pump unit is turned on for heating, the four-way reversing valve will be energized and reversing after a few seconds delay after the compressor is started. Now start to carry out reversing timing to four-way reversing valve, and judge whether this reversing time is greater than a second. The a is a set time parameter. If the commutation time is less than a second, continue timing. If the reversing time is greater than a second, it is judged whether the unit is defrosting. If the unit is defrosting, skip to end. If the unit is not defrosting, the heat pump unit controller detects and records the temperature T1 before the throttling element and...
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The invention relates to a judgment method for reversing failure of a four-way reversing valve in a heat pump unit. The method comprises the following steps that firstly, when the heat pump unit runs for heating, the four-way reversing valve is electrified and reverses for a seconds and the unit is not in the defrost running state (judgment is carried out through the air source heat pump unit), the previous temperature T1 of a throttling element and the later temperature T2 of the throttling element at the moment are recorded, and a is the set time parameter; secondly, the deduction value of T1 and T2 is compared with b, the b is the set temperature parameter, if the deduction value of T1 and T2 is smaller than b, a compressor or a draught fan or a cooling water pump corresponding to a refrigerating system stops running, and the unit reports the reverse failure fault of the four-way reversing valve. According to the judgment method, the line is clear, implementation is simple, the running reliability of the heat pump unit can be effectively improved, meanwhile, probable damage caused by bad long-term oil returning and liquid returning running of the compressor is avoided, and the running benefit of the unit is increased.
Description
technical field [0001] The invention relates to the field of air-source and water-source cold water heat pump air conditioners, in particular to a method for controlling a four-way reversing valve in a heat pump unit, specifically a method for judging the reversing failure of a four-way reversing valve in a heat pump unit . Background technique [0002] At present, in the existing air source and water source cold water heat pump units, the four-way reversing valve is generally used to switch the flow direction of the refrigerant during the cooling and heating operation. Usually, the four-way reversing valve is in the power-off state during shutdown or cooling operation; While in the heating operation, the four-way reversing valve is powered on and reversing after a few seconds delay after the compressor starts. [0003] According to the above control method, if the four-way reversing valve fails to reversing during the heating operation of the heat pump unit, the heat pump ...
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IPC IPC(8): F25B49/02
CPCF25B49/02F25B2500/06F25B2600/25
Inventor 梅奎李明周能
Owner NANJING TICA AIR CONDITIONING CO LTD