A method and system for shutting down a low-temperature unit, a low-temperature unit and a refrigeration system

A unit and low-temperature technology, which is applied to the shutdown method of low-temperature units, low-temperature units and refrigeration systems, and the system field. It can solve problems such as poor pressure control accuracy, high abnormal failure rate, and poor system operation safety, and achieve precise control and abnormal failures. Low rate, good precision effect

Active Publication Date: 2017-12-26
GREE ELECTRIC APPLIANCES INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In the existing technology, there are defects such as poor pressure control accuracy, poor system operation safety and high abnormal failure rate

Method used

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  • A method and system for shutting down a low-temperature unit, a low-temperature unit and a refrigeration system
  • A method and system for shutting down a low-temperature unit, a low-temperature unit and a refrigeration system
  • A method and system for shutting down a low-temperature unit, a low-temperature unit and a refrigeration system

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Embodiment Construction

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0043] According to an embodiment of the present invention, a method for shutting down a cryogenic unit is provided, such as figure 1 A flowchart illustrating an embodiment of the method of the present invention is shown. The method includes at least:

[0044] At step S110, low-pressure control is performed on the low-temperature unit (for example: low-temperat...

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Abstract

The invention discloses a method and system for shutting down a low-temperature unit, a low-temperature unit and a refrigeration system. The low pressure of the unit reaches the preset stable threshold, including: after the stable operation, the low pressure fluctuation range of the control system is within 10kpa; when the low pressure of the low temperature unit reaches the preset stable threshold, the low temperature unit is pumped down and blocked simultaneously The shutdown control of low-pressure protection enables the low-temperature unit to reach a preset shutdown condition and shut down reliably; wherein, the shutdown condition includes: the current pressure of the low-temperature unit is lower than the pump-down pressure of the low-temperature unit. The solution of the present invention can overcome the defects of poor pressure control accuracy, poor system operation safety and high abnormal failure rate in the prior art, and realize the beneficial effects of good pressure control accuracy, good system operation safety and low abnormal failure rate.

Description

technical field [0001] The invention relates to the technical field of low temperature control, in particular to a method and system for shutting down a low temperature unit, a low temperature unit and a refrigeration system. Background technique [0002] At present, the lowest evaporation temperature of low-temperature condensing units on the market is generally around -35°C. Therefore, for most cold storage shutdown methods, there are two main types: [0003] The first shutdown mode: when the target storage temperature reaches the requirement, the refrigeration system will shut down directly; see Figure 8 example shown. [0004] The second shutdown method: the target storage temperature reaches the requirement, and the refrigeration system is shut down by pumping down. [0005] For the first shutdown mode, the incompletely evaporated refrigerant liquid in the evaporator in the refrigeration system will migrate to the inside of the compressor after shutdown, which will e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B49/02
Inventor 李金奎肖福佳杨虹卫广穹李庆
Owner GREE ELECTRIC APPLIANCES INC
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