Anti-freezing protection system for air conditioner as well as air conditioner

Abstract

The invention provides an anti-freezing protection system for an air conditioner as well as the air conditioner. The system comprises a regulating valve opening degree controller which is used for judging whether an anti-freezing protection signal for presenting that the temperature of gas flowing out from a heat coil pipe is lower than a low-temperature threshold value is obtained or not; if the anti-freezing protection signal is obtained, opening degree of a regulating valve of the heat coil pipe is regulated to be biggest, otherwise, a set gas temperature of an air feeding section of the air conditioner and a gas temperature of a mixing section are obtained; a temperature difference value between the set temperature of the air feeding section and the gas temperature of the mixing section is obtained by calculating; an opening degree value which is matched with the temperature difference value is obtained according to a preset mapping table; opening degree of the regulating valve of the heat coil pipe is regulated according to the opening degree; and a mapping relationship between the temperature difference value and the opening degree value is set in the preset mapping table. The anti-freezing protection system provided by the invention effectively prevents an icing phenomenon, caused by a too small opening degree value of the regulating valve of the heat coil pipe, in a water pipe when the temperature of the mixing section is too low, and prevents the heat coil pipe from frost cracks.

Description

technical field [0001] The invention relates to the technical field of air purification equipment, in particular to an air conditioner antifreeze protection system and an air conditioner. Background technique [0002] The clean air conditioning system is usually used in the clean room. By sending a certain amount of treated air into the clean room, the clean room can maintain the required parameters such as temperature, humidity, wind speed, pressure and cleanliness. [0003] The antifreeze protection system is one of the standing systems of the clean air conditioner, which is used to prevent the thermal coil from freezing and cracking due to the overcooling of the working environment. [0004] In the prior art, the antifreeze protection system controls the opening of the thermal coil in two ways, one is: when the temperature behind the thermal coil is lower than the preset value, the opening of the thermal coil is controlled to be adjusted to Maximum, when the temperature ...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the antifreeze protection system controls the opening of the thermal coil in two ways, one is: when the temperature behind the thermal coil is lower than the preset value, the opening of the thermal coil is controlled to be adjusted to Maximum, when the temperature behind the heat coil is greater than the preset value, the opening of the heat coil is controlled by the temperature of the indoor return air, because the temperature of the mixed air in the clean air conditioning unit is the temperature after the indoor return air is mixed with the fresh air As a result, there is a big difference between the temperature of the indoor return air and the temperature of the mixed air in the actual operation of the unit. For the high temperature control of the indoor return air temperature, the control valve of the guide coil may still be in the closed state or the opening degree is small. Only when the temperature behind the heat coil is lower than the preset value, the control valve of the heat coil starts to open However, when the temperature behind the heating coil is lower than the preset value before, due to the low water flow rate in the water pipe, it is easy to cause freezing in the pipe, which will cause the heating coil to freeze and crack

Images