Air-cooled screw unit and its control method
An air-cooled screw and control method technology, applied in the direction of refrigerators, refrigeration components, compressors, etc., can solve problems such as unit shutdown, achieve the effects of avoiding shutdown, improving operation reliability, and increasing the pressure value of the suction end
Active Publication Date: 2020-06-26
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
[0004] Based on this, it is necessary to provide an air-cooled screw unit and its control method that can avoid the shutdown of the air-cooled screw unit due to the low pressure of the outlet end of the air-cooled screw unit in view of the problem that the pressure at the outlet end of the air-cooled screw unit becomes low and the unit shuts down.
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[0033] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.
[0034] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes ...
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The invention relates to a control method of an air-cooled screw unit, comprising the following steps: obtaining the working state of the compressor; when the compressor is in the starting state, obtaining the suction end pressure value of the suction end of the compressor; comparing the suction end pressure value and the preset minimum pressure value, adjust the working state of the bypass branch; when the pressure value at the suction end is less than the preset minimum pressure value within the preset time period, adjust the bypass branch to be in a through state; Within a preset time period, when the pressure value at the suction end is greater than or equal to the preset minimum pressure value, the bypass branch is adjusted to be disconnected. The control method of the above-mentioned air-cooled screw unit can open the bypass branch when the suction end pressure value is small according to the comparison between the suction end pressure value of the compressor and the preset minimum pressure value, thereby increasing the inflow compression The flow rate of the refrigerant at the suction end of the machine can be increased, thereby increasing the pressure value of the suction end of the compressor, preventing the compressor from shutting down due to low pressure protection, and improving the operational reliability of the unit.
Description
technical field [0001] The invention relates to the technical field of heat exchange device control, in particular to an air-cooled screw unit and a control method thereof. Background technique [0002] Air-cooled screw units are widely used in various industries due to their large cooling capacity and relatively high energy efficiency. However, when it is in the shutdown or standby state for a long time, especially in areas where the temperature difference between day and night is obvious or the environment changes greatly, the refrigerant in the air-cooled screw unit is easy to migrate with the change of the external environment temperature, so it is difficult to ensure that the refrigerant is concentrated in the air-cooled screw unit. In the same position, when the unit is restarted, the refrigerant will be insufficient due to the migration of the refrigerant, which will cause the unit to suffer from failures such as compressor low pressure protection. [0003] Especiall...
Claims
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IPC IPC(8): F25B1/047F25B41/04F25B41/06F25B49/02F25B41/20F25B41/34
CPCF25B1/047F25B49/02F25B2600/2513F25B2600/2501F25B41/31F25B41/20Y02B30/70
Inventor 程伦长黄凯亮程琦刘思源覃业星
Owner GREE ELECTRIC APPLIANCES INC