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

Abstract

The present disclosure provides a freeze protection method of a condensing fan, which can be applied to the technical field of air conditioning system control. The freeze protection method of the condensing fan comprises: collecting the temperature outside a train carriage by using a fresh air temperature sensor arranged at a fresh air outlet of an air conditioning system; collecting the temperature inside the train carriage by using a return air temperature sensor arranged at a return air outlet of the air conditioning system; adjusting the state of a freeze protection switch to an open state when the temperature outside the train carriage does not exceed a first predetermined temperature threshold; adjusting the state of the freeze protection switch to a closed state when the temperature outside the train carriage exceeds the first predetermined temperature threshold; determining the working state of the freeze protection switch according to the temperature outside the train carriage, the temperature inside the train carriage and the state feedback signal of the freeze protection switch; and performing freeze protection on the condensing fan set according to the working state. The present disclosure also provides an air conditioning system and a train.

Description

Technical Field

[0001] This disclosure relates to the field of air conditioning system control technology, specifically to a method for preventing freezing of a condenser fan, an air conditioning system, and a train. Background Technology

[0002] By starting the condenser fan and compressor of the air conditioning system, the system can be put into cooling mode. It is well known that air conditioning systems generally only activate in cooling mode under high-temperature conditions and typically do not activate under low-temperature conditions. However, in low-temperature environments, due to factors such as a malfunctioning temperature sensor measuring the ambient temperature or abnormalities in the temperature data transmission process, the condenser fan and compressor of the air conditioning system may be at risk of starting at low temperatures, thus reducing the safety of the air conditioning system's operation. Summary of the Invention

[0003] In view of the above problems, this disclosure provides a method for preventing freezing of condenser fans, an air conditioning system, and a train to improve the operational safety of air conditioning systems.

[0004] One aspect of this disclosure provides a method for anti-freeze protection of a condenser fan, comprising: collecting the temperature outside a train car using a fresh air temperature sensor installed at the fresh air inlet of an air conditioning system; collecting the temperature inside a train car using a return air temperature sensor installed at the return air inlet of the air conditioning system; adjusting the state of an anti-freeze protection switch to an open state when the temperature outside the train car does not exceed a first predetermined temperature threshold, thereby disconnecting the anti-freeze protection control circuit of the condenser fan unit of the air conditioning system, wherein the anti-freeze protection switch is connected in series in the anti-freeze protection control circuit of the condenser fan unit; adjusting the state of the anti-freeze protection switch to a closed state when the temperature outside the train car exceeds the first predetermined temperature threshold, thereby connecting the anti-freeze protection control circuit of the condenser fan unit; determining the operating state of the anti-freeze protection switch based on the temperature outside the train car, the temperature inside the train car, and the state feedback signal of the anti-freeze protection switch; and performing anti-freeze protection on the condenser fan unit according to the operating state of the anti-freeze protection switch.

[0005] According to an embodiment of this disclosure, determining the operating state of the antifreeze protection switch based on the temperature outside the train car, the temperature inside the train car, and the status feedback signal of the antifreeze protection switch includes: determining the operating state of the antifreeze protection switch as a fault state when the temperature outside the train car is greater than a second predetermined temperature threshold, the temperature inside the train car is greater than a third predetermined temperature threshold, and the status feedback signal is not in the closed state within a predetermined time period.

[0006] According to an embodiment of this disclosure, the above-mentioned antifreeze protection of the condenser fan unit based on the working state of the antifreeze protection switch includes: adjusting the antifreeze protection control circuit of the condenser fan unit to the open state when the working state of the antifreeze protection switch is in a fault state; and sending information that the working state of the antifreeze protection switch is in a fault state to the train vehicle control system.

[0007] According to an embodiment of this disclosure, the status feedback signal of the antifreeze protection switch is acquired in real time via a hard wire, wherein the hard wire is electrically connected to the antifreeze protection switch, and the status feedback signal includes a disconnection signal corresponding to the disconnection state and a closure signal corresponding to the closure state.

[0008] Another aspect of this disclosure provides an air conditioning system, including: an air conditioning unit, a condenser fan unit, a compressor, an anti-freeze protection switch, a fresh air temperature sensor, a return air temperature sensor, and an air conditioning controller, wherein the air conditioning controller is used to implement the above-mentioned anti-freeze protection method for the condenser fan.

[0009] According to an embodiment of this disclosure, the condenser fan unit is provided with an antifreeze protection control circuit. The antifreeze protection control circuit includes a power supply, the air conditioning controller, and the antifreeze protection switch and the condenser fan contactor group electrically connected between the power supply and the air conditioning controller. The condenser fan contactor group is used to control the condenser fan unit to be turned on or off.

[0010] According to an embodiment of this disclosure, the air conditioner controller is provided with a signal input terminal and a signal output terminal; the antifreeze protection switch is electrically connected to the signal input terminal; and the condenser fan contactor group is electrically connected to the signal output terminal.

[0011] According to an embodiment of this disclosure, the air conditioning system is provided with a fresh air inlet, a rainwater separator is provided at the fresh air inlet, a fresh air temperature sensor connector and a first rubber plug are provided at the rainwater separator; the fresh air temperature sensor is connected to the fresh air temperature sensor connector by inserting it into the first rubber plug; and the connection between the fresh air temperature sensor and the first rubber plug and the fresh air temperature sensor connector is fixed by applying glue.

[0012] According to an embodiment of this disclosure, the air conditioning system is provided with a return air vent, and a return air temperature sensor mounting bracket is provided at the return air vent. The return air temperature sensor mounting bracket is provided with a return air temperature sensor connector and a second rubber plug. The return air temperature sensor is connected to the return air temperature sensor connector by inserting it into the second rubber plug. Glue is applied to fix the return air temperature sensor at the connection between it and the second rubber plug and the return air temperature sensor connector.

[0013] Another aspect of this disclosure provides a train including the aforementioned air conditioning system.

[0014] According to embodiments of this disclosure, by setting an anti-freeze protection switch, and adjusting the anti-freeze protection switch to the open state when the temperature outside the carriage collected by the fresh air temperature sensor does not exceed a first predetermined temperature threshold, and adjusting the anti-freeze protection switch to the closed state when the temperature exceeds the first predetermined temperature threshold, the anti-freeze protection control circuit of the condenser fan unit can be controlled to open or close. This allows for control of the condenser fan unit's shutdown or startup in low-temperature environments (e.g., not exceeding the first predetermined temperature threshold), thereby reducing the risk of the condenser fan unit starting in low-temperature environments. Furthermore, by collecting the status feedback signal of the anti-freeze protection switch and determining the working state of the anti-freeze protection switch based on the temperature outside the train carriage, the temperature inside the train carriage, and the status feedback signal of the anti-freeze protection switch, and by providing anti-freeze protection for the condenser fan unit based on the working state, the risk of the condenser fan unit starting in low-temperature environments can be further reduced, thereby achieving the technical effect of improving the operational safety of the air conditioning system. Attached Figure Description

[0015] The foregoing contents, as well as other objects, features, and advantages of this disclosure, will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0016] Figure 1 This diagram schematically illustrates an application scenario of the antifreeze protection method for a condenser fan according to an embodiment of the present disclosure.

[0017] Figure 2 A flowchart illustrating an antifreeze protection method for a condenser fan according to an embodiment of the present disclosure is shown schematically.

[0018] Figure 3 A flowchart illustrating an antifreeze protection method for a condenser fan according to another embodiment of the present disclosure is shown.

[0019] Figure 4 An architectural diagram of an air conditioning system according to an embodiment of the present disclosure is shown schematically;

[0020] Figure 5AA schematic diagram of the antifreeze protection control circuit of a condenser fan unit according to an embodiment of the present disclosure is shown.

[0021] Figure 5B The schematic diagram shows the circuit diagram of the condenser fan contactor group controlling the condenser fan unit. Detailed Implementation

[0022] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0023] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0024] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0025] When using expressions such as "at least one of A, B, and C", they should generally be interpreted in accordance with the meaning that is commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B, and C, etc.).

[0026] In the technical solution disclosed herein, the user information (including but not limited to user personal information, user image information, user device information, such as location information) and data (including but not limited to data used for analysis, stored data, and displayed data) involved are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, storage, use, processing, transmission, provision, disclosure, and application of the relevant data all comply with the relevant laws, regulations, and standards of the relevant countries and regions, necessary confidentiality measures have been taken, and they do not violate public order and good morals. Corresponding operation entry points are provided for users to choose to authorize or refuse.

[0027] An air conditioning system requires a condenser fan and a compressor to operate in cooling mode. In one example, air conditioning cooling involves transferring heat from the indoor environment to the outdoor environment through the refrigerant in the refrigeration cycle. Specifically, the compressor consumes electricity to work, transforming the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas that enters the condenser. The condenser releases heat from the refrigerant into the air, condensing the gaseous refrigerant into a liquid state, which then enters the throttling device. The throttling device reduces the refrigerant pressure and adjusts the refrigerant flow before it enters the evaporator. In the evaporator, the refrigerant absorbs heat from the indoor air, condensing the liquid refrigerant into a gaseous state, which then enters the compressor to complete one refrigeration cycle. Therefore, air conditioning cooling requires the operation of both the condenser fan and the compressor.

[0028] As is well known, the cooling mode of an air conditioning system generally does not activate in low-temperature environments. For example, when the air conditioning controller detects that the outside temperature is below 10°C or the inside temperature is below 19°C via a temperature sensor, the controller can prevent the condenser fan and compressor from starting. However, if the temperature sensor malfunctions or the temperature data transmission is abnormal, there is a risk that the condenser fan and compressor will start in low-temperature environments, reducing the safety of the air conditioning system.

[0029] In view of this, embodiments of the present disclosure provide a method for anti-freeze protection of a condenser fan, an air conditioning system, and a train, for achieving high safety in the operation of the air conditioning system. Specifically, the method for anti-freeze protection of the condenser fan includes: using a fresh air temperature sensor installed at the fresh air inlet of the air conditioning system to collect the temperature outside the train car; using a return air temperature sensor installed at the return air inlet of the air conditioning system to collect the temperature inside the train car; when the temperature outside the train car does not exceed a first predetermined temperature threshold, adjusting the state of the anti-freeze protection switch to the open state, so that the anti-freeze protection control circuit of the condenser fan unit of the air conditioning system is disconnected, wherein the anti-freeze protection switch is connected in series in the anti-freeze protection control circuit of the condenser fan unit; when the temperature outside the train car exceeds the first predetermined temperature threshold, adjusting the state of the anti-freeze protection switch to the closed state, so that the anti-freeze protection control circuit of the condenser fan unit is connected; determining the operating state of the anti-freeze protection switch based on the temperature outside the train car, the temperature inside the train car, and the status feedback signal of the anti-freeze protection switch; and performing anti-freeze protection on the condenser fan unit according to the operating state of the anti-freeze protection switch.

[0030] Figure 1 The diagram illustrates an application scenario of the antifreeze protection method for a condenser fan according to an embodiment of the present disclosure.

[0031] like Figure 1As shown, application scenario 100 according to this embodiment may include a fresh air temperature sensor 101, a return air temperature sensor 102, an air conditioning controller 103, an anti-freeze protection switch 104, and an anti-freeze protection control circuit 105 for the condenser fan unit. The air conditioning controller 103 can be connected to the fresh air temperature sensor 101, the return air temperature sensor 102, and the anti-freeze protection switch 104, and the anti-freeze protection switch 104 can be connected to the anti-freeze protection control circuit 105 for the condenser fan unit via wired or wireless communication links or fiber optic cables, etc.

[0032] The fresh air temperature sensor 101 can be used to collect the temperature outside the train car and transmit the collected temperature outside the train car to the air conditioning controller 103; the return air temperature sensor 102 can be used to collect the temperature inside the train car and transmit the collected temperature inside the train car to the air conditioning controller 103.

[0033] The air conditioning controller 103 is used to adjust the state of the antifreeze protection switch 104 according to the temperature outside the train carriage, and to collect the status feedback signal of the antifreeze protection switch.

[0034] The antifreeze protection switch 104 can be used to control the antifreeze protection control circuit 105 of the condenser fan unit, thereby realizing the control of the condenser fan unit. When the antifreeze protection switch 104 is in the open state, the antifreeze protection control circuit 105 of the condenser fan unit is disconnected, the condenser fan cannot start, and the condenser fan and compressor cannot provide cooling conditions; when the antifreeze protection switch 104 is in the closed state, the antifreeze protection control circuit 105 of the condenser fan unit is connected, the condenser fan can start normally, and the condenser fan and compressor can provide cooling conditions.

[0035] It should be understood that Figure 1 The number of fresh air temperature sensors, return air temperature sensors, air conditioning controllers, anti-freeze switches, and anti-freeze protection control circuits for condenser fans shown in the diagram is merely illustrative. Depending on the implementation requirements, any number of these components can be included.

[0036] The following will be based on Figure 1 The described scene, through Figure 2 The method for preventing freezing of the condenser fan according to the disclosed embodiments is described in detail.

[0037] Figure 2 A flowchart illustrating an antifreeze protection method for a condenser fan according to an embodiment of the present disclosure is shown.

[0038] like Figure 2 As shown, the antifreeze protection method for the condenser fan in this embodiment includes operations S210 to S250.

[0039] When operating S210, the temperature outside the train car is collected using a fresh air temperature sensor installed at the fresh air inlet of the air conditioning system; and the temperature inside the train car is collected using a return air temperature sensor installed at the return air inlet of the air conditioning system.

[0040] When operating S220, if the temperature outside the train car does not exceed the first predetermined temperature threshold, the state of the antifreeze protection switch is adjusted to the off state, so that the antifreeze protection control circuit of the condenser fan unit of the air conditioning system is disconnected. The antifreeze protection switch is connected in series in the antifreeze protection control circuit of the condenser fan unit.

[0041] When operating S230, if the temperature outside the train car exceeds the first predetermined temperature threshold, the antifreeze protection switch is adjusted to the closed state so that the antifreeze protection control circuit of the condenser fan unit is turned on.

[0042] When operating S240, the working status of the antifreeze protection switch is determined based on the temperature outside the train car, the temperature inside the train car, and the status feedback signal of the antifreeze protection switch.

[0043] When operating S250, the condenser fan unit is protected against freezing according to the working status of the antifreeze protection switch.

[0044] According to embodiments of this disclosure, the fresh air inlet of the air conditioning system can introduce outdoor air into the room, and the return air inlet of the air conditioning system can deliver indoor return air to the outside.

[0045] According to embodiments of this disclosure, the air conditioning controller installed inside the air conditioning control cabinet can collect the external temperature of the train car and the internal temperature of the train car using fresh air temperature sensors and return air temperature sensors, respectively. Based on the collected external temperature of the train car and internal temperature of the train car, the controller can control the operation of various components of the air conditioning system, such as antifreeze protection switches, condenser fan units, compressors, electric heaters, evaporator fans, etc.

[0046] Optionally, the air conditioning controller can also communicate with the train's vehicle control system to receive air conditioning control commands from the vehicle control system and to feed back air conditioning operating status information to the vehicle control system.

[0047] According to embodiments of this disclosure, an anti-freeze protection switch can be used to provide anti-freeze protection for the condenser unit and compressor of an air conditioning system. Optionally, each air conditioner can be equipped with at least one anti-freeze protection switch, which can be installed below the condenser fan inside the condenser chamber. The anti-freeze protection switch can also be connected in series in the anti-freeze control circuit of the condenser fan unit to control the anti-freeze control circuit of the condenser fan unit. The control circuit of the condenser fan unit can be used to realize the start-up and shutdown of the condenser fan unit.

[0048] According to embodiments of this disclosure, a first predetermined temperature threshold can be used to determine whether the antifreeze protection switch is adjusted to an open or closed state, thereby controlling the antifreeze control circuit of the condenser fan unit and thus enabling the start-up and shutdown of the condenser fan unit. This first predetermined temperature threshold can be adaptively adjusted according to actual needs; for example, it may include 2.8°C or 8.3°C.

[0049] According to embodiments of this disclosure, when the antifreeze protection switch is open, the antifreeze protection control circuit of the condenser fan unit is disconnected, preventing the condenser fan unit from starting and the condenser fan compressor from providing cooling. When the antifreeze protection switch is closed, the antifreeze protection control circuit of the condenser fan unit is connected, allowing the condenser fan unit to start normally and the condenser fan compressor to provide cooling. This at least partially avoids the risk of the condenser fan unit starting in low-temperature environments.

[0050] Optionally, the air conditioning controller in this embodiment can also collect the status feedback signal of the antifreeze protection switch to further reduce the risk of the condenser fan unit starting in a low-temperature environment. For example, based on the temperature outside the train car, the temperature inside the train car, and the status feedback signal of the antifreeze protection switch, the operating status of the antifreeze protection switch can be determined; and then the condenser fan unit can be protected against freezing based on the operating status of the antifreeze protection switch.

[0051] According to embodiments of this disclosure, by setting an anti-freeze protection switch, and adjusting the anti-freeze protection switch to the open state when the temperature outside the carriage collected by the fresh air temperature sensor does not exceed a first predetermined temperature threshold, and adjusting the anti-freeze protection switch to the closed state when the temperature exceeds the first predetermined temperature threshold, the anti-freeze protection control circuit of the condenser fan unit can be controlled to open or close. This allows for control of the condenser fan unit's shutdown or startup in low-temperature environments (e.g., not exceeding the first predetermined temperature threshold), thereby reducing the risk of the condenser fan unit starting in low-temperature environments. Furthermore, by collecting the status feedback signal of the anti-freeze protection switch and determining the working state of the anti-freeze protection switch based on the temperature outside the train carriage, the temperature inside the train carriage, and the status feedback signal of the anti-freeze protection switch, and by providing anti-freeze protection for the condenser fan unit based on the working state, the risk of the condenser fan unit starting in low-temperature environments can be further reduced, thereby achieving the technical effect of improving the operational safety of the air conditioning system.

[0052] According to embodiments of this disclosure, as described above, determining the operating state of the antifreeze protection switch can further reduce the risk of starting the condenser fan unit in low-temperature environments. The process of determining the operating state of the antifreeze protection switch, and the process of performing antifreeze protection on the condenser fan unit based on the operating state of the antifreeze protection switch, will be described in detail below.

[0053] According to embodiments of this disclosure, the status feedback signal of the antifreeze protection switch described above can be acquired in the following manner: the status feedback signal of the antifreeze protection switch is acquired in real time via a hard wire, wherein the hard wire is electrically connected to the antifreeze protection switch, and the status feedback signal may include an open signal corresponding to the open state and a closed signal corresponding to the closed state.

[0054] According to embodiments of this disclosure, the process of determining the operating state of the antifreeze protection switch may include the following operations: when the temperature outside the train car is greater than a second predetermined temperature threshold, the temperature inside the train car is greater than a third predetermined temperature threshold, and the status feedback signal is not in a closed state within a predetermined time period, the operating state of the antifreeze protection switch can be determined to be a fault state.

[0055] According to embodiments of this disclosure, the second predetermined temperature threshold, the third predetermined temperature threshold, and the predetermined duration can all be adaptively adjusted according to actual needs. For example, after the air conditioning system enters cooling mode, if the air conditioning controller detects that the external temperature of the train carriage is greater than the second predetermined temperature threshold (e.g., 15°C), and the internal temperature of the train carriage is greater than the third predetermined temperature threshold (e.g., 28°C), and there is no feedback signal from the antifreeze protection switch within a predetermined duration (e.g., 15 minutes), the antifreeze protection switch can be determined to be in a fault state.

[0056] According to embodiments of this disclosure, the process of protecting the condenser fan unit from freezing based on the operating state of the antifreeze protection switch may include the following operations: when the antifreeze protection switch is in a fault state, adjusting the antifreeze protection control circuit of the condenser fan unit to an open state; and sending information that the antifreeze protection switch is in a fault state to the train vehicle control system.

[0057] According to embodiments of this disclosure, in the event of a malfunction in the antifreeze protection switch, the air conditioning controller can adjust the antifreeze protection control circuit of the condenser fan unit to an open state, thereby stopping the condenser fan unit. Optionally, information indicating a malfunction in the antifreeze protection switch can also be sent to the train control system, such as an antifreeze protection switch malfunction or a condenser fan unit antifreeze protection malfunction, to allow relevant personnel to handle the fault promptly, reduce the risk of the condenser fan starting at low temperatures, and improve the safety of the air conditioning system operation.

[0058] According to embodiments of this disclosure, by collecting the status feedback signal of the antifreeze protection switch and determining the working status of the antifreeze protection switch, the risk of low-temperature start-up of the condenser fan unit due to antifreeze protection switch failure can be at least partially avoided, thereby achieving redundant antifreeze protection for the condenser fan unit and improving the safety of air conditioning system operation.

[0059] Figure 3 A flowchart illustrating a method for protecting a condenser fan from freezing according to another embodiment of the present disclosure is shown.

[0060] like Figure 3 As shown, the antifreeze protection method for the condenser fan may include operation S310-1 and operation S360.

[0061] When operating S310, the air conditioning controller collects temperature values. For example, it collects the temperature outside the train car using a fresh air temperature sensor installed at the fresh air inlet of the air conditioning system; and it collects the temperature inside the train car using a return air temperature sensor installed at the return air inlet of the air conditioning system.

[0062] In operation S320, a temperature threshold is determined. For example, the temperature outside the train car is compared with a first predetermined temperature threshold; or the temperature outside the train car is compared with a second predetermined temperature threshold; or the temperature inside the train car is compared with a third predetermined temperature threshold, etc.

[0063] In operation S330, the air conditioning controller detects the operating status of the antifreeze protection switch. This includes detecting whether the status feedback signal is open or closed, and whether it has not been closed within a predetermined time period. If it is closed within the predetermined time period, operation S340 is executed; if it is not closed within the predetermined time period, operations S350 and S360 are executed.

[0064] When operating S340, the condenser fan unit is running normally.

[0065] When operating S350, the condenser fan unit stops running. For example, this disconnects the anti-freeze protection control circuit of the condenser fan unit.

[0066] When operating S360, fault information is reported. For example, information is sent to the train vehicle control system indicating that the antifreeze protection switch is in a fault state.

[0067] According to the embodiments of this disclosure, operations S310 to S320 can be referred to as operations S210 to S230, and operations S330 to S360 can be referred to as operations S240 to S250, which will not be repeated here.

[0068] It should be noted that, unless it is explicitly stated that there is a sequential order of execution between different operations, or that there is a sequential order of execution between different operations in terms of technical implementation, the execution order between multiple operations may not be significant, and multiple operations may be executed simultaneously.

[0069] Figure 4 An architectural diagram of an air conditioning system according to an embodiment of the present disclosure is shown schematically.

[0070] like Figure 4 As shown in the embodiments of this disclosure, an air conditioning system is also provided.

[0071] The air conditioning system may include an air conditioning unit 401, a condenser fan unit 402, a compressor 403, an anti-freeze protection switch 404, a fresh air temperature sensor 405, a return air temperature sensor 406, and an air conditioning controller 407. The air conditioning controller 407 can be used to implement the aforementioned anti-freeze protection method for the condenser fan. The air conditioning controller 407 can control the air conditioning unit 401 to achieve airflow direction transmission, etc.; the air conditioning controller 407 can control the condenser fan unit 402 and the compressor 403 to provide cooling conditions for the air conditioning system; the air conditioning controller 407 can control the anti-freeze protection switch 404 to provide anti-freeze protection for the condenser fan unit 402 and the compressor 403; the air conditioning controller 407 can control the fresh air temperature sensor 405 to collect the temperature outside the train carriage; and the air conditioning controller 407 can control the return air temperature sensor 406 to collect the temperature inside the train carriage. It is understood that the air conditioning system may also include other structures from related technologies, such as evaporators and throttling devices, which will not be elaborated upon here.

[0072] Figure 5A A schematic diagram of the antifreeze protection control circuit of a condenser fan unit according to an embodiment of the present disclosure is shown.

[0073] like Figure 5A As shown, the antifreeze protection control circuit may include a power supply 501, an air conditioning controller 502, and an antifreeze protection switch 503 and a condenser fan contactor group 504 electrically connected between the power supply 501 and the air conditioning controller 502. For example, the condenser fan contactor group 504 may include a first condenser fan contactor 5041 and a second condenser fan contactor 5042.

[0074] According to embodiments of this disclosure, the air conditioner controller 502 may be provided with a signal input terminal 5021 and a signal output terminal 5022; the antifreeze protection switch 503 may be electrically connected to the signal input terminal 5021; and the condenser fan contactor group 504 may be electrically connected to the signal output terminal 5022. For example, both the first condenser fan contactor 5041 and the second condenser fan contactor 5042 may be electrically connected to the signal output terminal 5022.

[0075] Figure 5B The schematic diagram shows the circuit diagram of the condenser fan contactor group controlling the condenser fan unit.

[0076] like Figure 5B As shown, the condenser fan contactor group 504 can be used to control the on / off state of the condenser fan group 505. For example, the condenser fan contactor group 504 may include a first condenser fan contactor 5041 and a second condenser fan contactor 5042; the condenser fan group 505 may include a first condenser fan (CF1) 5051 and a second condenser fan (CF2) 5052. The first condenser fan contactor 5041 can be electrically connected to the first condenser fan 5051 and is used to control the on / off state of the first condenser fan 5051. The second condenser fan contactor 5042 can be electrically connected to the second condenser fan 5052 and is used to control the on / off state of the second condenser fan 5052.

[0077] Optionally, the operating conditions of the condenser fan unit 505 can be AC380V, 3Φ (three-phase power), 50Hz. The voltage of the power supply 501 can be 110V.

[0078] By electrically connecting the antifreeze protection switch to the signal input terminal and the condenser fan contactor group to the signal output terminal, the state of the antifreeze protection switch can be adjusted by using the temperature signal outside the train carriage collected by the fresh air temperature sensor. For example, it can be adjusted to be open or closed, thereby controlling the condenser fan contactor group to open or close, thus achieving the effect of antifreeze protection for the condenser fan.

[0079] Optionally, the air conditioning system provided in this embodiment includes a fresh air temperature sensor and a return air temperature sensor, which are used to collect the temperature outside the train car and the temperature inside the train car, respectively. The setting method of the fresh air temperature sensor and the return air temperature sensor is described below.

[0080] The fresh air temperature sensor used in this embodiment can be configured as follows: the air conditioning system is provided with a fresh air inlet, a rainwater separator is provided at the fresh air inlet, and a fresh air temperature sensor connector and a first rubber plug are provided at the rainwater separator; the fresh air temperature sensor is connected to the fresh air temperature sensor connector by inserting it into the first rubber plug; and the connection between the fresh air temperature sensor, the first rubber plug, and the fresh air temperature sensor connector is fixed by applying glue.

[0081] The return air temperature sensor used in this embodiment can be configured as follows: the air conditioning system has a return air vent, a return air temperature sensor mounting bracket is provided at the return air vent, the return air temperature sensor mounting bracket is provided with a return air temperature sensor interface and a second rubber plug; the return air temperature sensor is connected to the return air temperature sensor interface by inserting it into the second rubber plug; and glue is applied to fix the return air temperature sensor at the connection between the return air temperature sensor, the second rubber plug, and the return air temperature sensor interface.

[0082] According to embodiments of this disclosure, by setting a fresh air temperature sensor and a return air temperature sensor, the state of the antifreeze protection switch can be adjusted according to the temperature outside the train car collected by the fresh air temperature sensor; and the working state of the antifreeze protection switch can be detected according to the temperature inside the train car collected by the return air temperature sensor and the status feedback signal of the antifreeze protection switch collected by the air conditioning controller, so as to further reduce the risk of low-temperature start-up of the condenser fan unit and improve the safety of air conditioning operation.

[0083] This disclosure also provides a train that may include the aforementioned air conditioning system, wherein the air conditioning controller in the air conditioning system can be used to implement the aforementioned antifreeze protection method for the condenser fan.

[0084] According to embodiments of this disclosure, by employing a train equipped with the aforementioned air conditioning system, the air conditioning system can reduce the risk of low-temperature start-up of the condenser fan unit and improve the safety of air conditioning operation, thus providing certain support for the safety of the train.

[0085] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of methods, systems, and trains according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0086] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0087] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A method for preventing freezing of a condenser fan, comprising: The temperature of the outside of the train carriages is collected by using a fresh air temperature sensor installed at the fresh air inlet of the air conditioning system; The temperature inside the train carriage is collected using a return air temperature sensor installed at the return air vent of the air conditioning system. When the temperature outside the train car does not exceed the first predetermined temperature threshold, the state of the antifreeze protection switch is adjusted to the off state so that the antifreeze protection control circuit of the condenser fan unit of the air conditioning system is disconnected. The antifreeze protection switch is connected in series in the antifreeze protection control circuit of the condenser fan unit. When the temperature outside the train carriage exceeds the first predetermined temperature threshold, the state of the antifreeze protection switch is adjusted to the closed state so that the antifreeze protection control circuit of the condenser fan unit is turned on. The working status of the antifreeze protection switch is determined based on the temperature outside the train car, the temperature inside the train car, and the status feedback signal of the antifreeze protection switch. The condenser fan unit is protected against freezing according to the working status of the antifreeze protection switch.

2. The method according to claim 1, wherein, The step of determining the operating status of the antifreeze protection switch based on the temperature outside the train car, the temperature inside the train car, and the status feedback signal of the antifreeze protection switch includes: If the temperature outside the train car exceeds a second predetermined temperature threshold, the temperature inside the train car exceeds a third predetermined temperature threshold, and the status feedback signal is not in the closed state within a predetermined time period, the working state of the antifreeze protection switch is determined to be a fault state.

3. The method according to claim 2, wherein, The step of providing antifreeze protection for the condenser fan unit based on the operating status of the antifreeze protection switch includes: If the antifreeze protection switch is in a fault state, the antifreeze protection control circuit of the condenser fan unit will be adjusted to the open state; and The system sends information to the train vehicle control system indicating that the antifreeze protection switch is in a fault state.

4. The method according to claim 1, wherein, The status feedback signal of the antifreeze protection switch is acquired in the following way: The status feedback signal of the antifreeze protection switch is acquired in real time by a hard wire, wherein the hard wire is electrically connected to the antifreeze protection switch, and the status feedback signal includes an open signal corresponding to the open state and a closed signal corresponding to the closed state.

5. An air conditioning system, comprising: Air conditioning unit, condenser fan unit, compressor, fresh air temperature sensor and return air temperature sensor, The condenser fan unit is equipped with an anti-freeze protection control circuit, which includes a power supply, an air conditioning controller, and an anti-freeze protection switch and a condenser fan contactor group electrically connected between the power supply and the air conditioning controller. The condenser fan contactor group is used to control the condenser fan unit to be turned on or off. The air conditioning controller is used to implement the antifreeze protection method for the condenser fan as described in any one of claims 1 to 4.

6. The system according to claim 5, wherein, The air conditioner controller is equipped with a signal input terminal and a signal output terminal; The antifreeze protection switch is electrically connected to the signal input terminal; The condenser fan contactor group is electrically connected to the signal output terminal.

7. The system according to claim 5, wherein, The air conditioning system is equipped with a fresh air inlet, a rainwater separator is installed at the fresh air inlet, and a fresh air temperature sensor interface and a first rubber plug are installed at the rainwater separator. The fresh air temperature sensor is connected to the fresh air temperature sensor interface by inserting it from the first rubber plug; The connection between the fresh air temperature sensor and the first rubber plug, as well as the connector of the fresh air temperature sensor, is fixed by applying adhesive.

8. The system according to claim 5, wherein, The air conditioning system is provided with a return air vent, and a return air temperature sensor mounting bracket is provided at the return air vent. The return air temperature sensor mounting bracket is provided with a return air temperature sensor interface and a second rubber plug. The return air temperature sensor is connected to the return air temperature sensor interface by inserting it from the second rubber plug; Apply adhesive to the connection between the return air temperature sensor, the second rubber plug, and the return air temperature sensor connector to secure them.

9. A train comprising an air conditioning system as described in any one of claims 5 to 8.

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