Heat pump system and fault judgment method for pressure sensor of heat pump system
A pressure sensor and heat pump system technology, applied in the field of heat exchange, can solve the problems of lack of oil and wear of the compressor, poor air conditioning effect, lack of refrigerant protection, etc., to avoid the effect of plate replacement and freeze damage
Pending Publication Date: 2019-03-08
TRANE AIR CONDITIONING SYST (CHINA) CO LTD
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[0002] At present, heat pump systems mostly detect the refrigerant pressure value of the heat pump system by installing a pressure sensor at the inlet of the compressor, and control the frequency of the compressor according to the refrigerant pressure value detected by the pressure sensor. Judgment of short-circuit and open-circuit faults, and once the pressure sensor drifts in pressure detection, there is no way to judge, which will lead to loss of control of compressor frequency and suction superheat
[0003] After the pressure sensor drifts in the pressure detection, the heat pump system will control the electronic expansion valve to gradually close down, so that the low-pressure pressure will gradually decrease, resulting in the lack of refrigerant for the compressor and frequency reduction, which will lead to poor air conditioning effect, compressor oil shortage wear, lack of refrigerant protection, Problems such as board replacement and freezing
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[0031] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.
[0032] The terminology used in the present invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein and in the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as use...
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The invention provides a heat pump system and a fault judgment method for a pressure sensor of the heat pump system. The heat pump system comprises a compressor, the pressure sensor, a pressure switchand a controller, the pressure sensor and the pressure switch are both arranged at an inlet of the compressor, and the pressure sensor and the pressure switch are both electrically connected with thecontroller; the pressure value detection range of the pressure sensor is 0-2.5 MPa, and the switch-off value of the pressure switch ranges from 0.45 MPa to 0.6 MPa; and the pressure sensor detects arefrigerant pressure value at the inlet of the compressor and sends the refrigerant pressure value to the controller, and the controller outputs a first alarming signal used for indicating a pressuresensor fault when it is determined that the pressure switch is switched off, and the refrigerant pressure value and the switch-off value of the pressure switch are larger than a preset threshold value. Therefore, maintenance personnel can conveniently find the sensor faults and solve the problems for a user in time, and the condition that the compressor is damaged due to oil shortage or a plate type heat exchanger is frozen off is avoided.
Description
technical field [0001] The invention relates to the field of heat exchange, in particular to a fault judgment method for a heat pump system and a pressure sensor thereof. Background technique [0002] At present, heat pump systems mostly detect the refrigerant pressure value of the heat pump system by installing a pressure sensor at the inlet of the compressor, and control the frequency of the compressor according to the refrigerant pressure value detected by the pressure sensor. Judgment of short-circuit and open-circuit faults, and once the pressure sensor drifts in pressure detection, there is no way to judge, which will cause the compressor frequency and suction superheat to be out of control. [0003] After the pressure sensor drifts in the pressure detection, the heat pump system will control the electronic expansion valve to gradually close down, so that the low-pressure pressure will gradually decrease, resulting in the lack of refrigerant in the compressor and frequ...
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IPC IPC(8): F25B49/02
CPCF25B49/005F25B49/02F25B2700/1933
Inventor 顾小刚余坚强丛倪鹏秦凯旋
Owner TRANE AIR CONDITIONING SYST (CHINA) CO LTD