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Method and system for judging rapid refrigerant leakage in refrigeration system

A technology of a refrigeration system and a determination method, which is applied to refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of refrigerant leakage, inability to quickly leak refrigerant, etc., and achieve the effect of no investment cost.

Active Publication Date: 2020-07-28
四川长虹空调有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a method and system for judging the rapid leakage of refrigerant in a refrigeration system, so as to solve the problem that the current DC inverter refrigeration system cannot accurately judge the rapid leakage of refrigerant

Method used

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  • Method and system for judging rapid refrigerant leakage in refrigeration system

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Embodiment 1

[0039] The method for judging the rapid leakage of refrigerant in the refrigeration system of this embodiment includes the following steps:

[0040] Step 1. Prestore a correspondence table 1 between the motor winding temperature and the operating frequency of the compressor in the refrigeration system, and preset the temperature difference threshold corresponding to the motor winding temperature of the compressor at the corresponding operating frequency; where, considering the frequency of the compressor The actual influencing factors, the operating frequency of the compressor can be jointly determined by the system refrigerant demand and the opening degree of the corresponding electronic expansion valve.

[0041] Step 2. Step 2. After the refrigeration system is started, calculate the instantaneous temperature of the compressor motor winding and obtain the operating frequency of the compressor at this time.

[0042] Step 3. Obtain the motor winding temperature corresponding t...

Embodiment 2

[0051] In this embodiment 2, in addition to applying steps 1-4 in embodiment 1, compared with embodiment 1, in step 1 of this embodiment, the corresponding relationship table between the temperature difference threshold and the exhaust port temperature is also pre-stored in the refrigeration system two.

[0052] Moreover, compared with Embodiment 1, in Step 2 of this embodiment, considering the influence of ambient temperature on the refrigeration system, after the refrigeration system is started, when calculating the instantaneous temperature of the motor winding and obtaining the operating frequency of the compressor at this time, The exhaust port temperature at this time is also acquired.

[0053] Moreover, compared with Embodiment 1, in step 4 of this embodiment, when judging whether the temperature difference is within the preset threshold range, considering the influence of ambient temperature on the refrigeration system, according to the obtained exhaust port temperatur...

Embodiment 3

[0057] The system for determining rapid refrigerant leakage in a refrigeration system in this embodiment can be applied to the method for determining rapid refrigerant leakage in a refrigeration system mentioned in Embodiment 1 or Embodiment 2. Here, only the method applied in Embodiment 1 will be described in detail for the system of this embodiment. The system for judging the rapid leakage of refrigerant in the refrigeration system of this embodiment includes a storage module, a compressor operating frequency acquisition module, a motor winding temperature calculation module and Comparison module, its structural block diagram see figure 1 ,in:

[0058] The storage module stores the corresponding relationship table 1 between the motor winding temperature and the compressor operating frequency, as well as the preset temperature difference threshold corresponding to the motor winding temperature of the compressor at the corresponding operating frequency; the compressor operatin...

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Abstract

The invention provides a method and system for judging rapid leakage of refrigerant in a refrigeration system, belonging to the field of DC frequency conversion refrigeration. The present invention solves the problem that the current DC frequency conversion refrigeration system cannot accurately judge the rapid leakage of the refrigerant. Set the temperature difference threshold corresponding to the motor winding temperature of the compressor at the corresponding operating frequency; after the refrigeration system is started, calculate the instantaneous temperature of the compressor motor winding and obtain the operating frequency of the compressor at this time; obtain the compressor in the corresponding table 1. The motor winding temperature corresponding to the operating frequency, and compare it with the calculated instantaneous temperature to calculate the temperature difference; judge whether the temperature difference is within the preset threshold range, if it is, then judge that the refrigerant is normal, otherwise judge that the refrigeration rapid leakage of agent. The invention can timely and effectively judge the rapid leakage of refrigerant.

Description

technical field [0001] The invention relates to the field of DC frequency conversion refrigeration, in particular to the field of how to judge the rapid leakage of refrigerant in a refrigeration system. Background technique [0002] The refrigeration system consists of compressors, condensers, throttling devices and evaporators, which are connected and sealed by metal tubes, and filled with refrigerant inside. The compressors are usually fully enclosed, and the compressor completes the process from suction to exhaust. The process is realized through the operation of the motor. Since the motor inevitably generates heat during operation, if the heat cannot be taken away or balanced in time, the temperature of the motor winding will continue to rise, and eventually exceed the insulation safety temperature requirement, resulting in failure of the motor. [0003] The refrigerant flows through the motor before (or after) the compressor completes compression, and heats up the compr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/36F25B49/02
CPCF24F11/36F25B49/02F25B2500/222
Inventor 李越峰林志强
Owner 四川长虹空调有限公司
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