CN-117698780-B - Anti-freezing protection method for condensing fan, air conditioning system and train

CN117698780BCN 117698780 BCN117698780 BCN 117698780BCN-117698780-B

Abstract

The disclosure provides an anti-freezing protection method for a condensing fan, which can be applied to the technical field of air conditioning system control. The anti-freezing protection method of the condensing fan comprises the steps of utilizing a fresh air temperature sensor arranged at a fresh air port of an air conditioning system to collect the temperature outside a train carriage, utilizing a return air temperature sensor arranged at a return air port of the air conditioning system to collect the temperature inside the train carriage, adjusting the state of an anti-freezing protection switch to be in an open state when the temperature outside the train carriage does not exceed a first preset temperature threshold value, adjusting the state of the anti-freezing protection switch to be in a closed state when the temperature outside the train carriage exceeds the first preset temperature threshold value, determining the working state of the anti-freezing protection switch according to the temperature outside the train carriage, the temperature inside the train carriage and a state feedback signal of the anti-freezing protection switch, and conducting anti-freezing protection on the condensing fan unit according to the working state. The disclosure also provides an air conditioning system and a train.

Inventors

GONG HAIBIN
WU JIJIANG
LI ZHIGUO
SUN RUI
MOU MINGMING
ZHAO MIN
SHI XIAOLONG

Assignees

中车青岛四方机车车辆股份有限公司

Dates

Publication Date: 20260508
Application Date: 20240112

Claims (9)

1. An anti-freezing protection method of a condensing fan comprises the following steps: The temperature outside the train carriage is collected by utilizing a fresh air temperature sensor arranged at a fresh air port of an air conditioning system; When the temperature outside the train carriage does not exceed a first preset temperature threshold value, adjusting the state of an anti-freezing protection switch to be in an off state so that an anti-freezing protection control loop of a condensing fan unit of the air conditioning system reaches the off state, wherein the anti-freezing protection switch is connected in series in the anti-freezing protection control loop of the condensing fan unit; adjusting the state of the anti-freezing protection switch to a closed state in the event that the temperature outside the train car exceeds the first predetermined temperature threshold, so that the anti-freezing protection control loop of the condensing fan set reaches a conducting state; Determining the working state of the anti-freezing protection switch according to the temperature outside the train carriage, the temperature inside the train carriage and the state feedback signal of the anti-freezing protection switch; and carrying out anti-freezing protection on the condensing fan unit according to the working state of the anti-freezing protection switch.
2. The method of claim 1, wherein the determining the operating state of the anti-freeze protection switch based on the temperature outside the railcar, the temperature inside the railcar, and the state feedback signal of the anti-freeze protection switch comprises: And determining that the working state of the anti-freezing protection switch is a fault state under the condition that the temperature outside the train carriage is greater than a second preset temperature threshold value, the temperature inside the train carriage is greater than a third preset temperature threshold value and the state feedback signal is not in the closed state within a preset time length.
3. The method of claim 2, wherein the freeze protection of the condensing fan set according to the operating state of the freeze protection switch comprises: adjusting the anti-freezing protection control loop of the condensing fan set to be in an off state under the condition that the working state of the anti-freezing protection switch is in a fault state, and And sending the information that the working state of the anti-freezing protection switch is a fault state to a train control system.
4. The method of claim 1, wherein the status feedback signal of the freeze protection switch is collected by: The state feedback signals of the anti-freezing protection switch are collected in real time through a hard wire, wherein the hard wire is electrically connected with the anti-freezing protection switch, and the state feedback signals comprise an opening signal corresponding to the opening state and a closing signal corresponding to the closing state.
5. An air conditioning system comprises an air conditioning unit, a condensing fan unit, a compressor, a fresh air temperature sensor and a return air temperature sensor, The condensing fan unit is provided with an anti-freezing protection control loop, the anti-freezing protection control loop comprises a power supply, an air conditioner controller, and the anti-freezing protection switch and the condensing fan contactor unit which are electrically connected between the power supply and the air conditioner controller, wherein the condensing fan contactor unit is used for controlling the on or off of the condensing fan unit; the air conditioner controller is used for realizing the anti-freezing protection method of the condensing fan according to any one of claims 1-4.
6. The system of claim 5, wherein the air conditioning controller is provided with a signal input and a signal output; the anti-freezing protection switch is electrically connected with the signal input end; And the condensing fan contactor group is electrically connected with the signal output end.
7. The system of claim 5, wherein the air conditioning system is provided with a fresh air port, a rain separator is provided at the fresh air port, a fresh air temperature sensor plug port and a first rubber plug are provided at the rain separator; the fresh air temperature sensor is connected to the fresh air temperature sensor plug-in port through the first rubber plug; The junction of new trend temperature sensor with first rubber card stopper and new trend temperature sensor interface is fixed through gluing.
8. The system of claim 5, wherein the air conditioning system is provided with an air return port, an air return temperature sensor mounting bracket is arranged at the air return port, and an air return temperature sensor plug port and a second rubber plug are arranged on the air return temperature sensor mounting bracket; the return air temperature sensor is connected to the return air temperature sensor plug through the second rubber plug; and the connection part of the return air temperature sensor, the second rubber clamping plug and the return air temperature sensor plug interface is fixed by gluing.
9. A train comprising the air conditioning system according to any one of claims 5 to 8.

Description

Anti-freezing protection method for condensing fan, air conditioning system and train Technical Field The disclosure relates to the technical field of air conditioning system control, in particular to an anti-freezing protection method for a condensing fan, an air conditioning system and a train. Background By starting the condensing fan and the compressor of the air conditioning system, the air conditioning system can be put into a refrigeration mode. It is well known that the cooling mode of an air conditioning system is typically only activated in a high temperature environment and is typically not activated in a low temperature environment. However, in a low-temperature environment, the condensing fan and the compressor of the air conditioning system may be at risk of low-temperature start due to a fault of a temperature sensor for measuring the ambient temperature or an abnormality in a process of transmitting temperature data, so that the operation safety of the air conditioning system is reduced. Disclosure of Invention In view of the above, the present disclosure provides an anti-freezing protection method of a condensing fan, an air conditioning system and a train, which improve the operation safety of the air conditioning system. One aspect of the disclosure provides an anti-freezing protection method of a condensing fan, which comprises the steps of collecting temperature outside a train carriage by using a fresh air temperature sensor arranged at a fresh air port of an air conditioning system, collecting temperature inside the train carriage by using a return air temperature sensor arranged at a return air port of the air conditioning system, adjusting a state of an anti-freezing protection switch to be in an off state when the temperature outside the train carriage does not exceed a first preset temperature threshold value, enabling an anti-freezing protection control loop of a condensing fan unit of the air conditioning system to be in an off state, wherein the anti-freezing protection switch is connected in series in the anti-freezing protection control loop of the condensing fan unit, adjusting the state of the anti-freezing protection switch to be in a closed state when the temperature outside the train carriage exceeds the first preset temperature threshold value, enabling the anti-freezing protection control loop of the condensing fan unit to be in an on state, determining an operating state of the anti-freezing protection switch according to the temperature outside the train carriage, the temperature inside the train carriage and a state feedback signal of the anti-freezing protection switch, and enabling the condensing fan unit to be in accordance with the operating state of the anti-freezing protection switch. According to the embodiment of the disclosure, the determining the working state of the anti-freezing protection switch according to the temperature outside the train carriage, the temperature inside the train carriage and the state feedback signal of the anti-freezing protection switch comprises determining that the working state of the anti-freezing protection switch is a fault state when the temperature outside the train carriage is greater than a second preset temperature threshold value, the temperature inside the train carriage is greater than a third preset temperature threshold value and the state feedback signal is not the closed state within a preset time period. According to the embodiment of the disclosure, the anti-freezing protection of the condensing fan set according to the working state of the anti-freezing protection switch comprises the steps of adjusting an anti-freezing protection control loop of the condensing fan set to be in an off state when the working state of the anti-freezing protection switch is in a fault state, and sending information that the working state of the anti-freezing protection switch is in the fault state to a train vehicle control system. According to the embodiment of the disclosure, the state feedback signal of the anti-freezing protection switch is acquired by acquiring the state feedback signal of the anti-freezing protection switch in real time through a hard wire, wherein the hard wire is electrically connected with the anti-freezing protection switch, and the state feedback signal comprises an opening signal corresponding to the opening state and a closing signal corresponding to the closing state. The air conditioning system comprises an air conditioning unit, a condensing fan unit, a compressor, an anti-freezing protection switch, a fresh air temperature sensor, a return air temperature sensor and an air conditioning controller, wherein the air conditioning controller is used for realizing the anti-freezing protection method of the condensing fan. According to an embodiment of the present disclosure, the condensation fan set is provided with an anti-freezing protection control loop, and the anti-freezing protection control loo