CN115507221A

CN115507221A - Four-way reversing valve fault detection method, device, equipment, system and medium

Info

Publication number: CN115507221A
Application number: CN202211386289.6A
Authority: CN
Inventors: 邵龙
Original assignee: Shanghai Cool Air Transport Refrigeration Equipment Co ltd
Current assignee: Shanghai Cool Air Transport Refrigeration Equipment Co ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2022-12-23

Abstract

The embodiment of the invention discloses a four-way reversing valve fault detection method, a four-way reversing valve fault detection device, four-way reversing valve fault detection equipment, a four-way reversing valve fault detection system and a four-way reversing valve fault detection medium, wherein the method comprises the steps of obtaining fluid pressure collected by a pressure sensor which is arranged corresponding to a specified valve port of a four-way reversing valve; determining whether at least one of the following judgment conditions is satisfied according to the change of the current fluid pressure relative to the previous fluid pressure and the operation state of the current operation mode: the pressure control valve comprises a valve core, a first reversing valve port, a second reversing valve port, a first inlet valve port, a second inlet valve port, a first outlet valve port, a second inlet valve port, a second outlet valve port, a first pressure sensor, a second pressure sensor and a second pressure sensor, wherein the valve core is arranged on the valve core; if yes, determining that the four-way reversing valve has a fault; the fault of the four-way reversing valve can be automatically and accurately identified in real time, so that the consequence of serious unit damage caused by the delayed fault identification of the four-way reversing valve is avoided.

Description

Four-way reversing valve fault detection method, device, equipment, system and medium

Technical Field

The invention relates to the technical field of refrigeration, in particular to a four-way reversing valve fault detection method and device, a heat exchange system, cold and warm air conditioning equipment and a computer readable storage medium.

Background

At present, with the development of refrigeration and heat pump technologies, a four-way reversing valve is widely applied to a refrigeration/heat pump system and used for switching between a refrigeration mode and a heat pump mode.

In the process of implementing the invention, the inventor finds that the existing fault detection method for the four-way reversing valve at least has the following problems:

firstly, a professional refrigeration detector uses a tool to detect the four-way reversing valve and a coil thereof so as to check whether the fault reason is related to the four-way reversing valve, however, the manual detection has low efficiency and large workload, and real-time detection cannot be realized;

secondly, the temperature value collected by the temperature sensor in the refrigeration/heat pump system is used for identifying the fault, however, the temperature value detected by the temperature sensor often has certain hysteresis, the fault cannot be identified in time at the first time, and the serious unit damage result can be caused in the hysteresis period.

Disclosure of Invention

In order to solve the existing technical problems, embodiments of the present invention provide a four-way reversing valve fault detection method and apparatus, a heat exchange system, a cooling and heating air conditioning device, and a computer readable storage medium, which can automatically and accurately identify a four-way reversing valve fault in real time.

The technical scheme of the embodiment of the invention is realized as follows:

in a first aspect, a method for detecting a fault of a four-way reversing valve is provided, which includes:

acquiring fluid pressure acquired by a pressure sensor arranged corresponding to a specified valve port of the four-way reversing valve;

determining whether at least one of the following determination conditions is satisfied, based on a change in the current fluid pressure with respect to the previous fluid pressure and the operating state of the current operating mode: a fluid pressure sudden change corresponding to a first change-over valve port that switches between the high-pressure passage and the low-pressure passage based on a change in the position of the valve element, a fluid pressure sudden change corresponding to a second change-over valve port that switches between the high-pressure passage and the low-pressure passage based on a change in the position of the valve element, and a fluid pressure fluctuation corresponding to a first inlet port connected to the low-pressure passage;

if yes, determining that the four-way reversing valve has a fault.

In a second aspect, a four-way reversing valve fault detection device is provided, which includes:

the acquisition module is used for acquiring fluid pressure acquired by a pressure sensor which is arranged corresponding to a specified valve port of the four-way reversing valve;

and the fault judgment module is used for determining whether at least one of the following judgment conditions is met according to the change of the current fluid pressure relative to the previous fluid pressure and the operation state of the current operation mode: a fluid pressure sudden change corresponding to a first change-over valve port that switches between the high-pressure passage and the low-pressure passage based on a change in the position of the valve element, a fluid pressure sudden change corresponding to a second change-over valve port that switches between the high-pressure passage and the low-pressure passage based on a change in the position of the valve element, and a fluid pressure fluctuation corresponding to a first inlet port connected to the low-pressure passage;

and the determining module is used for determining that the four-way reversing valve has a fault according to the judgment result of the fault judging module.

In a third aspect, a heat exchange system is provided, which includes a four-way reversing valve, a fluid pipeline correspondingly connected to a valve port of the four-way reversing valve, a pressure sensor correspondingly connected to a specified valve port of the four-way reversing valve, and a controller connected to the pressure sensor;

the pressure sensor is arranged in the specified valve port or a fluid pipeline connected with the specified valve port, and is used for collecting the fluid pressure of the specified valve port and sending the fluid pressure to the controller;

the controller is used for executing the four-way reversing valve fault detection method in any embodiment of the application.

The fourth aspect provides a cooling and heating air conditioning device, which comprises a controller, a four-way reversing valve, a compressor, an evaporator, a condenser and a throttling device, wherein the first reversing valve port and the second reversing valve port are respectively connected with the evaporator and the condenser; the cold and warm air conditioning equipment further comprises a pressure sensor which is arranged corresponding to the first reversing valve port, the second reversing valve port, the first valve inlet port and the second valve inlet port;

when the valve core of the four-way reversing valve is positioned at a first position, the first valve inlet port is communicated with the first reversing valve port to form a low-pressure passage, and the second valve inlet port is communicated with the second reversing valve port to form a high-pressure passage;

when the valve core of the four-way reversing valve is positioned at a second position, the first valve inlet port and the second valve reversing port are communicated to form a low-pressure passage, and the second valve inlet port and the first valve reversing port are communicated to form a high-pressure passage;

In a fifth aspect, a computer-readable storage medium is provided, storing a computer program that, when executed by a processor, causes the processor to perform a four-way reversing valve fault detection method as described in any of the embodiments of the present application.

In the method for detecting a fault of the four-way reversing valve provided in the embodiment of the present application, fluid pressure is acquired in real time through the pressure sensor arranged corresponding to the designated valve port of the four-way reversing valve, and according to real-time analysis of the acquired fluid pressure, and by combining the operation state of the current operation mode and the change of the fluid pressure, a fluid pressure sudden change corresponding to a first reversing valve port that is switched between a high-pressure passage and a low-pressure passage based on the position change of a valve core, a fluid pressure sudden change corresponding to a second reversing valve port that is switched between the high-pressure passage and the low-pressure passage based on the position change of the valve core, and a fluid pressure fluctuation corresponding to a first inlet valve port connected with the low-pressure passage are used as judgment conditions to determine whether the four-way reversing valve is faulty or not; therefore, if the four-way reversing valve breaks down, the four-way reversing valve can be automatically identified at the first time, so that the purpose of automatically and accurately identifying the four-way reversing valve fault in real time can be realized, and the consequence of serious unit damage caused by delayed fault identification of the four-way reversing valve can be avoided.

The four-way reversing valve fault detection device, the heat exchange system, the cooling and heating air conditioning equipment and the computer readable storage medium provided by the embodiments respectively belong to the same concept as the corresponding four-way reversing valve fault detection method embodiments, so that the four-way reversing valve fault detection device, the cooling and heating air conditioning equipment and the computer readable storage medium respectively have the same technical effects as the corresponding four-way reversing valve fault detection method embodiments, and are not repeated herein.

Drawings

FIG. 1 is a system architecture diagram of an alternative application scenario of the four-way reversing valve fault detection method in an embodiment;

FIG. 2 is a flow diagram of a method for four-way reversing valve fault detection in an embodiment;

FIG. 3 is a schematic view of an embodiment of a four-way reversing valve with a spool at one end;

FIG. 4 is a schematic structural view of the valve spool of the four-way reversing valve of FIG. 3 at the other end;

FIG. 5 is a flow diagram of a method for four-way reversing valve fault detection in a particular example;

FIG. 6 is a schematic structural diagram of a four-way reversing valve fault detection apparatus in an embodiment;

fig. 7 is a schematic structural diagram of a cooling and heating air conditioning device in an embodiment.

Detailed Description

The technical solution of the present invention is further described in detail with reference to the drawings and specific embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the following description, reference is made to the expression "some embodiments" which describes a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.

Referring to fig. 1, a system architecture diagram of an optional application scenario of the four-way reversing valve fault detection method provided in the embodiment of the present application is shown, where the fault detection system includes a four-way reversing valve 21, pressure sensors respectively corresponding to valve ports of the four-way reversing valve 21, and a controller 23 electrically connected to the pressure sensors. The ports of the four-way selector valve 21 include a first selector port 211 that switches between the high-pressure passage 25 and the low-pressure passage 26 based on a change in the spool position, a second selector port 212 that switches between the high-pressure passage 25 and the low-pressure passage 26 based on a change in the spool position, a first inlet port 213 connected to the low-pressure passage 26, and a second inlet port 214 connected to the high-pressure passage 25. The pressure sensors include a first pressure sensor 221, a second pressure sensor 222, a third pressure sensor 223, and a fourth pressure sensor 224, which are respectively disposed corresponding to the first direction valve port 211, the second direction valve port 212, the first inlet port 213, and the second inlet port 214. The first pressure sensor 221, the second pressure sensor 222, the third pressure sensor 223 and the fourth pressure sensor 224 collect fluid pressure at corresponding valve openings in real time and send the fluid pressure to the controller 23, the controller 23 performs real-time analysis according to the collected fluid pressure, and determines whether the four-way reversing valve 21 has a fault by combining the running state of the current running mode and the change of the fluid pressure, so that the purpose of automatically and accurately identifying the fault of the four-way reversing valve 21 in real time is achieved.

Referring to fig. 2, a method for detecting a fault of a four-way reversing valve according to an embodiment of the present disclosure may be applied to the controller shown in fig. 1. The four-way reversing valve fault detection method comprises the following steps:

and S101, acquiring fluid pressure acquired by a pressure sensor arranged corresponding to a specified valve port of the four-way reversing valve.

The designated valve port refers to a designated one of the four valve ports of the four-way reversing valve, and can also refer to a designated plurality of the four valve ports of the four-way reversing valve. In the embodiment of the application, the designated valve port is determined according to the fluid pressure of which valve port or valve ports are required to be used in the judgment condition of whether the four-way reversing valve has a fault.

S103, determining whether at least one of the following judgment conditions is met according to the change of the current fluid pressure relative to the previous fluid pressure and the operation state of the current operation mode: the fluid pressure surge valve includes a fluid pressure surge valve that is connected to a first inlet port connected to the low pressure passage, and a fluid pressure surge valve that is connected to a second inlet port connected to the high pressure passage.

The current operation mode refers to a current working mode of a heat exchange system to which the four-way reversing valve belongs, for example, the heat exchange system usually at least comprises a heating mode and a cooling mode, and the current operation mode is one of the heating mode and the cooling mode correspondingly. The operation states mainly include a steady state and a transient state, the steady state refers to a continuous operation state in the current operation mode, and the transient state refers to a process from one steady state to the next steady state. The pressure sensors correspondingly arranged on the appointed valve ports acquire the corresponding fluid pressure at each valve port in real time according to the preset frequency, and the change of the fluid pressure can be judged according to the fluid pressure acquired at each acquisition moment in real time. Wherein the previous fluid pressure may be a fluid pressure corresponding to a previous acquisition time with respect to a current acquisition time. The controller may perform a determination after obtaining the acquired fluid pressure at each acquisition time, and compare the current fluid pressure acquired at the current acquisition time with a previous fluid pressure acquired at a previous acquisition time to determine a change in the fluid pressure.

The designated valve port can be a first reversing valve port which is switched between a high-pressure passage and a low-pressure passage based on the position change of the valve core, and correspondingly, the judgment strategy is that the fluid pressure corresponding to the first reversing valve port is suddenly changed; the designated valve port may be a second direction-changing valve port that is switched between the high-pressure passage and the low-pressure passage based on a change in position of the valve element, and correspondingly, the judgment strategy is a sudden change in fluid pressure corresponding to the second direction-changing valve port; the designated valve port can be a first valve port connected with the low-pressure passage, and correspondingly, the judgment strategy refers to the fluid pressure fluctuation corresponding to the first valve port; the designated valve port can comprise any two combinations of a first reversing valve port, a second reversing valve port and a first inlet valve port, and correspondingly, the judgment strategy refers to the combination of two corresponding judgment conditions; the designated valve port may include a combination of a first direction-changing valve port, a second direction-changing valve port and a first inlet valve port, and correspondingly, the judgment strategy refers to a combination of the above three judgment conditions.

And S105, if yes, determining that the four-way reversing valve has a fault.

And determining that the four-way reversing valve has a fault when the judgment condition is met according to the change of the current fluid pressure relative to the previous fluid pressure and the running state of the current running mode and the corresponding judgment strategy. The controller can judge the change of the fluid pressure at each acquisition moment, so that the fault of the four-way reversing valve can be identified in time.

In the above embodiment, the pressure sensor provided corresponding to the designated port of the four-way reversing valve is used to collect the fluid pressure in real time, and according to the real-time analysis of the collected fluid pressure, and in combination with the operating state of the current operating mode and the change of the fluid pressure, the fluid pressure jump corresponding to the first reversing port that switches between the high-pressure path and the low-pressure path based on the change of the position of the valve core, the fluid pressure jump corresponding to the second reversing port that switches between the high-pressure path and the low-pressure path based on the change of the position of the valve core, and the fluid pressure fluctuation corresponding to the first inlet port connected to the low-pressure path are used as the judgment conditions to determine whether the four-way reversing valve fails; therefore, if the four-way reversing valve breaks down, the controller can automatically recognize the four-way reversing valve at the first time, the purpose of automatically and accurately recognizing the four-way reversing valve in real time is achieved, and the consequence that serious unit damage is caused due to the fact that the four-way reversing valve is delayed in fault recognition can be avoided.

In some embodiments, the determining that the four-way reversing valve is malfunctioning comprises:

and controlling the unit to which the four-way reversing valve belongs to be closed.

Referring to fig. 3 and 4, the four-way selector valve 21 includes a valve body 215, a valve element 216 disposed in the valve body 215, and four valve ports disposed on the valve body 215. The four valve ports are respectively connected with different pipeline interfaces in a heat exchange system to which the four-way reversing valve 21 belongs through connecting pipes. The valve element 216 can slide in the valve body 215 to switch the communication between different ports to form a channel. The four ports are respectively a first inlet port 213 connected to the low-pressure passage 26, a second inlet port 214 connected to the high-pressure passage 25, and a first change-over port 211 and a second change-over port 212 that are switched between the high-pressure passage 25 and the low-pressure passage 26 based on a change in position of the valve element 216, as shown in fig. 3, when the valve element 216 is positioned at one end of the valve body 215, the second inlet port 214 communicates with the second change-over port 212, the first inlet port 213 communicates with the first change-over port 211, and at this time, the valve element 216 of the four-way change-over valve 21 is in an open position; as shown in fig. 4, when the spool 216 slides to the other end of the valve body 215, the second inlet port 214 communicates with the first direction valve port 211, the first inlet port 213 communicates with the second direction valve port 212, and the spool 216 of the four-way direction valve 21 is in the closed position. Taking the case that the valve core 216 of the four-way reversing valve is in the position shown in fig. 3, and the unit to which the four-way reversing valve belongs is in the heat pump mode at the moment, if the four-way reversing valve fails, the controller automatically recognizes the failure in the first time and then controls the unit to be closed in time, so that the serious consequence that the unit is damaged due to the condition that the unit fails to work or the failure is not cleared in time can be avoided.

The unit to which the four-way reversing valve belongs is determined according to the product of the practical application of the four-way reversing valve, and if the four-way reversing valve is applied to an air conditioner, the unit to which the four-way reversing valve belongs is an air conditioner unit.

In the embodiment, the controller judges the change of the fluid pressure at each acquisition moment according to the operation state of the current operation mode, and can timely control the unit to be closed when the fault of the four-way reversing valve is timely identified through the change of the current fluid pressure relative to the previous fluid pressure, so as to avoid the consequence of serious unit damage caused by the fault of the four-way reversing valve.

Optionally, the determining that the four-way reversing valve fails further includes:

and outputting fault prompt information of the four-way reversing valve.

The fault prompt information can be sound prompt information and indicator light prompt information which are locally displayed on the heat exchange system to which the four-way reversing valve belongs; or prompt information sent to a personal terminal in communication connection with the heat exchange system to which the four-way reversing valve belongs.

In the above embodiment, the controller determines the change of the fluid pressure at each acquisition moment according to the change of the current fluid pressure relative to the previous fluid pressure and the operation state of the current operation mode, and can control the belonging unit to stop or perform system protection measures when the fault of the four-way reversing valve is identified in time, and can output the fault prompt information according to the preset mode, so that the associated user can know the condition that the fault of the four-way reversing valve is identified in time.

In some embodiments, the determining whether at least one of the following determination conditions is satisfied according to the change of the current fluid pressure relative to the previous fluid pressure and the operation state of the current operation mode includes:

if the current heat pump mode is in the continuous operation period, determining whether at least one of the following judgment conditions is met according to the change of the current fluid pressure relative to the prior fluid pressure:

the current fluid pressure of a first reversing valve port which is switched between a high-pressure passage and a low-pressure passage based on the position change of a valve core is increased relative to the prior fluid pressure, and the difference value between the current fluid pressure corresponding to the first reversing valve port and the pressure value in the high-pressure passage meets a first preset condition;

the fluid pressure corresponding to a second reversing valve port which is switched between the high-pressure passage and the low-pressure passage based on the position change of the valve core is reduced relative to the prior fluid pressure, and the difference value between the current fluid pressure corresponding to the second reversing valve port and the pressure value in the low-pressure passage meets a second preset condition;

the fluid pressure corresponding to the first inlet port connected to the low-pressure passage varies beyond a first fluctuation threshold.

In a heat pump mode, the four-way reversing valve is opened, the valve core is positioned at one end of the valve body, the second valve inlet port is communicated with the second reversing valve port, the first valve inlet port is communicated with the first reversing valve port, the interior of a passage formed by the communication between the first valve inlet port and the first reversing valve port is in a low-pressure environment, and fluid pressure acquired by pressure sensors corresponding to the first valve inlet port and the first reversing valve port is low-pressure; high-pressure gas flows out from the second valve inlet port through the interior of the valve body through the second reversing valve port, the interior of a passage formed by the communication between the second valve inlet port and the second reversing valve port is in a high-pressure environment, and fluid pressure acquired by pressure sensors arranged corresponding to the second valve inlet port and the second reversing valve port is high-pressure.

In the continuous operation period of the heat pump mode, if the current fluid pressure of the first reversing valve port is increased relative to the previous fluid pressure and is suddenly increased from the original low pressure to the high pressure, the fluid pressure corresponding to the first reversing valve port is suddenly changed, and the fault of the four-way reversing valve can be judged; in the continuous operation period of the heat pump mode, it is determined that the fluid pressure of the first switching valve port changes suddenly, specifically, the current fluid pressure of the first switching valve port is increased from the original low pressure to a pressure close to the high pressure relative to the previous fluid pressure, as shown in formula one: pu-m is less than or equal to P1, pu is the pressure value in the high-pressure passage, the pressure value in the high-pressure passage can adopt the pressure value in the high-pressure passage at the last acquisition moment acquired by a corresponding pressure sensor, P1 refers to the current fluid pressure of the first reversing valve port, and m is a preset value. If the current fluid pressure of the second reversing valve port is reduced relative to the prior fluid pressure and is suddenly reduced from the original high pressure to the low pressure, the fluid pressure corresponding to the second reversing valve port is suddenly changed, and the fault of the four-way reversing valve can be judged; during the continuous operation period of the heat pump mode, it is determined that the fluid pressure at the second reversing valve port changes suddenly, specifically, the current fluid pressure at the second reversing valve port is reduced from the original high pressure to a pressure close to the low pressure with respect to the previous fluid pressure, as shown in formula two: pd-j is more than or equal to P3 and less than or equal to Pd + j, pd is the pressure value in the low-pressure passage, the pressure value in the low-pressure passage can adopt the pressure value in the low-pressure passage at the last acquisition moment acquired by the corresponding pressure sensor, P3 is the current fluid pressure of the second reversing valve port, and j is a preset value. If the current fluid pressure of the first inlet valve port changes relative to the previous fluid pressure and exceeds a first fluctuation threshold value, the fluid pressure corresponding to the first inlet valve port fluctuates, and the fault of the four-way reversing valve can be judged; in a specific example, the fluid pressure fluctuation corresponding to the first inlet port means that the current fluid pressure corresponding to the first inlet port suddenly increases by n relative to the fluid pressure of the previous fluid pressure during the continuous operation period of the heat pump mode, and n is a preset value.

In the above embodiment, in a stable operation state of the heat pump mode, the fault of the four-way reversing valve is identified according to whether the fluid pressure corresponding to the specified valve port of the four-way reversing valve has the preset sudden change condition, and the pressure value in the high-pressure passage and the pressure value in the low-pressure passage of the heat exchange system to which the four-way reversing valve belongs in practical application can be acquired to judge whether the fluid pressure change of the specified valve port meets the preset sudden change condition, so that the accuracy of fault detection on the four-way reversing valve is not limited by the change of an application scene, the four-way reversing valve can be adapted to more application scenes for use, and the accuracy of fault detection can be improved.

Optionally, the four-way reversing valve fault detection method further includes:

and if the current state is in the continuous operation period of the heat pump mode, determining whether the change of the fluid pressure corresponding to the second inlet port exceeds a second fluctuation threshold value according to the change of the current fluid pressure corresponding to the second inlet port connected with the high-pressure passage relative to the previous fluid pressure.

In the continuous operation period of the heat pump mode, the fluid pressure of the second inlet valve port connected with the high-pressure passage is suddenly changed, and the sudden change can also be used as a judgment condition for judging the fault of the four-way reversing valve. If the current fluid pressure of the second inlet valve port changes relative to the previous fluid pressure and exceeds a second fluctuation threshold value, the fluid pressure corresponding to the second inlet valve port fluctuates, and the fault of the four-way reversing valve can be judged; in a specific example, the fluid pressure fluctuation corresponding to the second inlet port refers to the current flow corresponding to the second inlet port during the continuous operation period of the heat pump modeThe body pressure is suddenly reduced by n, which is a preset value, relative to the fluid pressure of the previous fluid pressure. Because the second inlet valve port is connected with the high-pressure passage, and the pressure value in the high-pressure passage is relatively stable, the abrupt change of the fluid pressure at the second inlet valve port can be used as a supplementary judgment condition in the judgment strategy, so that the integrity of the corresponding judgment strategy can be improved, for example, the fluid pressure of the first reversing valve suddenly rises to a value (a) close to the high-pressure passage pressure, the fluid pressure of the second reversing valve suddenly drops to a value (B) close to the low-pressure passage pressure, the fluid pressure of the first inlet valve port suddenly increases by n (C), and the fluid pressure of the second inlet valve port suddenly drops by n (D), and the judgment strategy for identifying the fault of the four-way reversing valve in the continuous operation period of the heat pump mode can comprise: (1) a; (2) b; (3) c; (4) AB; (5) BC; (6) AC; (7) ABC; (8) AD; (9) BD; car (r) CD;

ABD；

BCD；

ACD；

ABCD。

in the embodiment, the sudden change of the fluid pressure at the second inlet valve is used as an additional judgment condition in the judgment strategy instead of independently forming the judgment strategy, so that the deviation which is possibly caused when the four-way reversing valve is in fault by only adopting the pressure value fluctuation in the high-pressure passage is avoided, the fault detection accuracy is improved, and the completeness of the corresponding judgment strategy can be improved by using the sudden change of the fluid pressure as a supplementary judgment condition.

In some embodiments, the determining whether at least one of the following determination conditions is satisfied based on the change in the current fluid pressure from the previous fluid pressure and the operating state of the current operating mode includes:

if the current mode is in the continuous operation period of the refrigeration mode, determining whether at least one of the following judgment conditions is met according to the change of the current fluid pressure relative to the previous fluid pressure:

the current fluid pressure of a first reversing valve port which is switched between a high-pressure passage and a low-pressure passage based on the position change of a valve core is reduced relative to the prior fluid pressure, and the difference value between the current fluid pressure corresponding to the first reversing valve port and the pressure value in the low-pressure passage meets a third preset condition;

the fluid pressure corresponding to a second direction-changing valve port which is switched between the high-pressure passage and the low-pressure passage based on the position change of the valve core is increased relative to the prior fluid pressure, and the difference value between the current fluid pressure corresponding to the second direction-changing valve port and the pressure value in the high-pressure passage meets a fourth preset condition;

the change of the fluid pressure corresponding to the first inlet port connected to the low-pressure passage exceeds the third fluctuation threshold.

In the continuous operation period of the refrigeration mode, if the current fluid pressure of the first reversing valve port is reduced relative to the prior fluid pressure and is suddenly reduced from the original high pressure to the low pressure, the fluid pressure corresponding to the first reversing valve port is suddenly changed, and the fault of the four-way reversing valve can be judged; in the continuous operation period of the refrigeration mode, it is determined that the fluid pressure of the first direction valve port changes suddenly, specifically, the current fluid pressure of the first direction valve port is reduced from the original high pressure to a pressure close to the low pressure with respect to the previous fluid pressure, where the third preset condition may be the same as the second preset condition, such as formula three: pd-j is more than or equal to P1 and less than or equal to Pd + j, pd is the pressure value in the low-pressure passage, the pressure value in the low-pressure passage can adopt the pressure value in the low-pressure passage at the last acquisition moment acquired by a corresponding pressure sensor, P1 refers to the current fluid pressure of the first reversing valve port, and j is a preset value; if the current fluid pressure of the second reversing valve port is increased relative to the previous fluid pressure and is suddenly increased from the original low pressure to the high pressure, the fluid pressure corresponding to the second reversing valve port is suddenly changed, and the fault of the four-way reversing valve can be judged; in the continuous operation period of the heat pump mode, it is determined that the fluid pressure of the second directional valve port changes suddenly, specifically, the current fluid pressure of the second directional valve port is increased from the original low pressure to a pressure close to the high pressure relative to the previous fluid pressure, where the fourth preset condition may be the same as the first preset condition, such as the formula four: pu-m is less than or equal to P3, pu is the pressure value in the high-pressure passage, the pressure value in the high-pressure passage can adopt the pressure value in the high-pressure passage at the last acquisition moment acquired by a corresponding pressure sensor, P3 is the current fluid pressure of the second reversing valve port, and m is a preset value; if the current fluid pressure of the first inlet valve port changes relative to the previous fluid pressure and exceeds a first fluctuation threshold value, the fluid pressure corresponding to the first inlet valve port fluctuates, and the fault of the four-way reversing valve can be judged; in a specific example, the fluid pressure fluctuation corresponding to the first inlet port means that the current fluid pressure corresponding to the first inlet port suddenly increases by n relative to the fluid pressure of the previous fluid pressure during the continuous operation period of the cooling mode, and n is a preset value.

In the above embodiment, in a stable operation state of the refrigeration mode, the fault of the four-way reversing valve is identified according to whether the fluid pressure corresponding to the specified valve port of the four-way reversing valve has the preset sudden change condition, and the internal pressure value of the high-pressure passage and the internal pressure value of the low-pressure passage of the heat exchange system to which the four-way reversing valve belongs in practical application can be collected to judge whether the fluid pressure change of the specified valve port meets the preset sudden change condition, so that the fault detection accuracy of the four-way reversing valve is not limited by the change of an application scene, the four-way reversing valve can be adapted to be used in more application scenes, and the fault detection accuracy can be improved.

and if the current state is in the continuous operation period of the refrigeration mode, determining whether the fluid pressure change corresponding to the second inlet port exceeds a fourth fluctuation threshold value according to the change of the current fluid pressure corresponding to the second inlet port connected with the high-pressure passage relative to the previous fluid pressure.

In the continuous operation period of the refrigeration mode, the fluid pressure of the second inlet valve port connected with the high-pressure passage is suddenly changed, and the sudden change can also be used as a judgment condition for judging the fault of the four-way reversing valve. If the current fluid pressure of the second inlet port changes relative to the previous fluid pressure by more than a second fluctuation threshold value, the second inlet portThe fault of the four-way reversing valve can be judged according to the corresponding fluid pressure fluctuation; in a specific example, the fluid pressure fluctuation corresponding to the second inlet port means that the current fluid pressure corresponding to the second inlet port suddenly decreases by n relative to the fluid pressure of the previous fluid pressure during the continuous operation period of the cooling mode, where n is a preset value. Because the second inlet valve port is connected with the high-pressure passage, and the pressure value in the high-pressure passage is relatively stable, the abrupt change of the fluid pressure at the second inlet valve port can be used as a supplementary judgment condition in the judgment strategy, so that the integrity of the corresponding judgment strategy can be improved, for example, the fluid pressure of the first reversing valve suddenly drops to a value (E) close to the low-pressure passage pressure, the fluid pressure of the second reversing valve suddenly rises to a value (F) close to the high-pressure passage pressure, the fluid pressure of the first inlet valve port suddenly increases by n (C), the fluid pressure of the second inlet valve port suddenly decreases by n (D), and the judgment strategy for identifying the fault of the four-way reversing valve in the continuous operation period of the refrigeration mode can comprise: (1) e; (2) f; (3) c; (4) e, F; (5) FC; (6) EC; (7) EFC; (8) ED; (9) FD; car (r) CD;

EFD；

FCD；

ECD；

EFCD。

in the above embodiment, the sudden change in the fluid pressure at the second inlet valve is used as an additional judgment condition in the judgment strategy instead of independently forming the judgment strategy, so that the deviation which may occur when the four-way reversing valve is failed is identified by only adopting the pressure value fluctuation in the high-pressure passage, the accuracy of failure detection is improved, and the completeness of the corresponding judgment strategy can be improved by using the sudden change in the fluid pressure as a supplementary judgment condition.

Optionally, before determining whether at least one of the following determination conditions is satisfied according to the change of the current fluid pressure relative to the previous fluid pressure and the operation state of the current operation mode, the method includes:

determining a current operation mode according to a received operation mode selection instruction; and determining the operation state of the current operation mode according to whether the operation mode switching instruction is received or not.

Optionally, the user may select the current operation mode through a key panel, and for example, the user may adjust the current operation mode of the cooling and heating air conditioning device through the key panel on the remote controller. In this embodiment, the determining the operation state of the current operation mode may refer to determining the received operation mode selection instruction according to the detected key operation of the user, determining the current operation mode, determining whether the operation mode switching instruction is received according to the detected key operation of the user in the current operation mode, and determining whether the operation state is a continuous operation state in the current operation mode or a mode switching state. Generally, the normal working state of the cooling and heating air conditioning equipment is a continuous working state in a certain operation mode, for example, the normal working state in winter is a heat pump mode, the normal working state in summer is a refrigeration mode, under the condition of less normal working state of the cooling and heating air conditioning equipment, the condition that the heat pump mode needs to be switched to the refrigeration mode or the refrigeration mode needs to be switched to the heat pump mode can occur, for some possible application requirements under certain specific situations, the condition that the working state is in the mode switching state is detected, the execution of the detection and identification of the fault of the four-way reversing valve according to the prior judgment strategy is suspended, so that the occurrence of the misjudgment is avoided until the cooling and heating air conditioning equipment is switched and is in the stable state of the operation mode again, and the execution of the corresponding judgment strategy is restarted according to the switched operation mode to perform the fault detection and identification of the four-way reversing valve.

In the four-way reversing valve fault detection method provided by the embodiment of the application, the running state of the running mode is used as one of the consideration factors for determining the matching judgment condition in the four-way reversing valve fault detection process, and the running state of the running mode can be used as whether to suspend the execution of fault detection, so that the detection accuracy can be further improved, and the application requirements under various specific situations can be considered.

In order to enable a more comprehensive understanding of the four-way reversing valve fault detection method provided by the embodiment of the present application, a specific example is described below, wherein a first reversing valve port, a first valve inlet port, a second reversing valve port, and a second valve inlet port of the four-way reversing valve are sequentially connected with a connecting pipe 2, a connecting pipe 3, a connecting pipe 4, and a connecting pipe 5, and a pressure sensor 7, a pressure sensor 8, a pressure sensor 9, and a pressure sensor 10 are sequentially arranged in the connecting pipe 2, the connecting pipe 3, the connecting pipe 4, and the connecting pipe 5; under the normal heating working state, the connecting pipe 2 is communicated with the connecting pipe 3, the pressures detected by the pressure sensor 7 and the pressure sensor 8 are both low pressures, the connecting pipe 5 is communicated with the connecting pipe 4, the pressures detected by the pressure sensor 10 and the pressure sensor 9 are both high pressures, under the normal cooling working state, the connecting pipe 3 is communicated with the connecting pipe 4, the pressures detected by the pressure sensor 8 and the pressure sensor 9 are both low pressures, the connecting pipe 5 is communicated with the connecting pipe 2, the pressures detected by the pressure sensor 10 and the pressure sensor 7 are both high pressures, the detection data of the pressure sensor is transmitted to a remote controller through a data collector, a controller executes a four-way reversing valve fault detection method, and the fault of the four-way reversing valve is detected and identified in real time, please refer to fig. 5, and the four-way reversing valve fault detection method comprises the following steps:

s11, fluid pressures acquired by pressure sensors respectively corresponding to a first reversing valve port, a first valve inlet port, a second reversing valve port and a second valve inlet port of the four-way reversing valve are acquired.

And S12, under the mode continuous operation state, according to the change of the current fluid pressure relative to the previous fluid pressure, determining whether the fluid pressure change meets a preset condition according to a corresponding judgment strategy.

In the heat pump mode, the judgment strategy may be:

a sudden rise in pressure of the pressure sensor 7 is detected, up to a pressure close to the high pressure Pu. The approximation here means that Pu-m ≦ pressure P1 of the pressure sensor 7. And detects a sudden drop in pressure of the pressure sensor 9 to be close to the low pressure Pd. The approximation here means that Pd-j. Ltoreq. Pressure P3. Ltoreq. Pd + j of the pressure sensor 9. And a sudden pressure fluctuation of the pressure sensor 8 is detected. And a sudden pressure fluctuation of the pressure sensor 10 is detected.

Optionally, the following steps may also be performed: a sudden rise in pressure of the pressure sensor 7 is detected, up to a pressure close to the high pressure Pu. Here, the approximation means that Pu-m is equal to or smaller than the pressure P1 of the pressure sensor 7. And a sudden fluctuation in the pressure of the pressure sensor 8 is detected. It should be noted that, in this case, the four-way reversing valve may be provided with the pressure sensor 7 and the pressure sensor 8 only in the connection pipe 2 and the connection pipe 3, respectively.

Optionally, the following steps may also be performed: a sudden pressure rise of the pressure sensor 7 is detected to be close to the high pressure Pu. The approximation here means that Pu-m ≦ pressure P1 of the pressure sensor 7. It should be noted that, in this case, the four-way reversing valve may be provided with only the pressure sensors 7 in the connecting pipes 2.

Optionally, the following steps may also be performed: a sudden fluctuation in the pressure of the pressure sensor 8 is detected. The fluctuation here means that the pressure P2 of the pressure sensor 8 suddenly increases by n. In this case, the four-way selector valve may be provided with pressure sensors 8 only in the connection pipes 3.

Wherein m, n and j are preset values, for example, m can be 0, 1 or 2MPa, n can be 0.3, 0.4 or 0.5MPa, j can be 0, 0.1 or 0.2MPa, and the specific value can be adjusted and changed according to the pressure of the used refrigerant.

In the cooling mode, the judgment strategy may be:

a sudden drop in pressure of the pressure sensor 7 is detected, down to a pressure close to the low pressure Pd. The approximation here means that Pd-j. Ltoreq. Pd + j is the pressure P1 of the pressure sensor 7. And a sudden rise in pressure of the pressure sensor 9 is detected to be close to the high-pressure Pu. Here, close means that Pu-m is smaller than the pressure P3 of the pressure sensor 9. And a sudden pressure fluctuation of the pressure sensor 8 is detected. And a sudden pressure fluctuation of the pressure sensor 10 is detected.

Optionally, the following steps may also be performed: a sudden drop in pressure of the pressure sensor 7 is detected, down to a pressure close to the low pressure Pd. The approximation here means that Pd-j. Ltoreq. Pd + j is the pressure P1 of the pressure sensor 7. And a sudden fluctuation in the pressure of the pressure sensor 8 is detected. It should be noted that, in this case, the four-way reversing valve may be provided with the pressure sensor 7 and the pressure sensor 8 only in the connection pipe 2 and the connection pipe 3, respectively.

Optionally, the following steps may also be performed: a sudden drop in pressure of the pressure sensor 7 is detected, down to a pressure close to the low pressure Pd. The approximation here means that Pd-j. Ltoreq. Pd + j is the pressure P1 of the pressure sensor 7. It should be noted that, in this case, the four-way reversing valve may be provided with only the pressure sensors 7 in the connecting pipes 2.

Optionally, the following steps may also be performed: a sudden fluctuation in the pressure of the pressure sensor 8 is detected. The fluctuation here means that the pressure P2 of the pressure sensor 8 suddenly increases by n. In this case, the four-way selector valve may be provided with pressure sensors 8 in the connection pipes 3, respectively.

And if so, executing S13 and determining that the four-way reversing valve has a fault.

If not, S12 is repeatedly executed according to the acquisition frequency of the pressure sensor.

According to the four-way reversing valve fault detection method, the fault state of the four-way reversing valve is automatically identified through the pressure change corresponding to the appointed valve port, the fault detection efficiency of the four-way reversing valve can be greatly improved, the detection accuracy rate can be improved, a real-time monitoring method is adopted to replace regular maintenance, the detection instantaneity is good, and the heat exchange system is protected.

Referring to fig. 6, in another aspect of the present embodiment, a four-way reversing valve fault detection apparatus is provided, including: the acquiring module 231 is used for acquiring fluid pressure acquired by a pressure sensor arranged corresponding to a specified valve port of the four-way reversing valve; a failure determining module 232, configured to determine whether at least one of the following determination conditions is satisfied according to a change of the current fluid pressure relative to the previous fluid pressure and an operation state of the current operation mode: the pressure control valve comprises a valve core, a first reversing valve port, a second reversing valve port, a first inlet valve port, a second inlet valve port, a first outlet valve port, a second inlet valve port, a second outlet valve port, a first pressure sensor, a second pressure sensor and a second pressure sensor, wherein the valve core is arranged on the valve core; and the determining module 233 is configured to determine that the four-way reversing valve fails according to a judgment result of the failure judging module.

Optionally, the determining module 233 is configured to control the unit to which the four-way reversing valve belongs to be closed.

Optionally, the determining module 233 is further configured to output a fault notification message of the four-way reversing valve fault.

Optionally, the fault determining module 232 is configured to determine whether at least one of the following determination conditions is satisfied according to a change of the current fluid pressure relative to the previous fluid pressure if the current heat pump mode is in the continuous operation period: the current fluid pressure of a first reversing valve port which is switched between a high-pressure passage and a low-pressure passage based on the position change of a valve core is increased relative to the prior fluid pressure, and the difference value between the current fluid pressure corresponding to the first reversing valve port and the pressure value in the high-pressure passage meets a first preset condition; the fluid pressure corresponding to a second reversing valve port which is switched between the high-pressure passage and the low-pressure passage based on the position change of the valve core is reduced relative to the prior fluid pressure, and the difference value between the current fluid pressure corresponding to the second reversing valve port and the pressure value in the low-pressure passage meets a second preset condition; the change in fluid pressure corresponding to the first inlet port connected to the low-pressure passage exceeds the first fluctuation threshold.

Optionally, the fault determining module 232 is configured to, if the current state is in the continuous operation period of the heat pump mode, determine whether a fluid pressure change corresponding to the second inlet port exceeds a second fluctuation threshold according to a change of a current fluid pressure corresponding to the second inlet port connected to the high-pressure passage relative to a previous fluid pressure.

Optionally, the fault determining module 232 is configured to determine, if the current fluid pressure is in the continuous operation period of the refrigeration mode, whether at least one of the following determination conditions is satisfied according to a change of the current fluid pressure relative to a previous fluid pressure: the current fluid pressure of a first reversing valve port which is switched between a high-pressure passage and a low-pressure passage based on the position change of a valve core is reduced relative to the prior fluid pressure, and the difference value between the current fluid pressure corresponding to the first reversing valve port and the pressure value in the low-pressure passage meets a third preset condition; the fluid pressure corresponding to a second reversing valve port which is switched between the high-pressure passage and the low-pressure passage based on the valve core position change is increased relative to the prior fluid pressure, and the difference value between the current fluid pressure corresponding to the second reversing valve port and the pressure value in the high-pressure passage meets a fourth preset condition; the change of the fluid pressure corresponding to the first inlet port connected to the low-pressure passage exceeds the third fluctuation threshold.

Optionally, the fault determining module 232 is configured to determine, if the current state is in the continuous operation period of the refrigeration mode, whether a fluid pressure change corresponding to the second inlet port exceeds a fourth fluctuation threshold according to a change of a current fluid pressure corresponding to the second inlet port connected to the high-pressure passage relative to a previous fluid pressure.

Optionally, the fault determining module 232 is configured to determine the current operation mode according to the received operation mode selection instruction; and determining the running state of the current running mode according to whether the running mode switching instruction is received or not.

It should be noted that the structure provided in the embodiments of the present application does not constitute a limitation to the four-way reversing valve fault detection apparatus, and all or part of the modules may be implemented by software, hardware, or a combination thereof. The modules can be embedded in a hardware form or independent from a controller in the computer device, or can be stored in a memory in the computer device in a software form, so that the controller can call and execute operations corresponding to the modules. In other embodiments, more or fewer modules than those shown may be included in the four-way reversing valve fault detection apparatus.

In another aspect of the embodiments of the present application, a heat exchange system is provided, which includes a four-way reversing valve, a fluid pipeline correspondingly connected to a valve port of the four-way reversing valve, a pressure sensor correspondingly connected to a specified valve port of the four-way reversing valve, and a controller connected to the pressure sensor; the pressure sensor is arranged in the specified valve port or a fluid pipeline connected with the specified valve port, and is used for collecting the fluid pressure of the specified valve port and sending the fluid pressure to the controller; the controller is used for executing the four-way reversing valve fault detection method in any embodiment of the application.

In another aspect of the present embodiment, please refer to fig. 7, which provides a cooling and heating air conditioning apparatus, including a controller 51, a four-way reversing valve 52, a compressor 53, an evaporator 54, a condenser 55, and a throttling device 56, where the first reversing valve port and the second reversing valve port are respectively connected to the evaporator 54 and the condenser 55, the throttling device 56 is connected between the evaporator 54 and the condenser 55, the first inlet port is connected to the compressor 53, and the four-way reversing valve 52 further includes a second inlet port connected to the compressor 53; the cold and warm air conditioning equipment further comprises a pressure sensor which is arranged corresponding to the first reversing valve port, the second reversing valve port, the first valve inlet port and the second valve inlet port; when the valve core of the four-way reversing valve is positioned at a first position, the first valve inlet port is communicated with the first reversing valve port to form a low-pressure passage, and the second valve inlet port is communicated with the second reversing valve port to form a high-pressure passage; when the valve core of the four-way reversing valve is positioned at a second position, the first valve inlet port and the second valve reversing port are communicated to form a low-pressure passage, and the second valve inlet port and the first valve reversing port are communicated to form a high-pressure passage; the functions of an indoor unit and an outdoor unit of the cooling and heating air conditioning equipment are changed by changing the flow channel of the refrigerant and changing the flow direction of the refrigerant: in summer, the refrigerant liquid evaporates and absorbs heat in the indoor unit (the indoor unit is an evaporator) to become gas, and releases heat in the outdoor unit (the outdoor unit is a condenser) for indoor cooling; in winter, the refrigerant liquid evaporates and absorbs external heat in the outdoor unit (the outdoor unit is an evaporator), and releases heat in the indoor unit (the indoor unit is a condenser) for supplying heat indoors. The controller 51 is configured to execute the four-way reversing valve fault detection method according to any embodiment of the present disclosure.

In another aspect, a computer-readable storage medium is provided, which stores a computer program, and when the computer program is executed by a processor, the processor is enabled to execute the four-way reversing valve fault detection method according to any embodiment of the present disclosure.

It will be understood by those skilled in the art that all or part of the processes of the methods provided in the above embodiments may be implemented by a computer program, which can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above embodiments of the methods. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), rambus (Rambus) direct RAM (RDRAM), direct Rambus Dynamic RAM (DRDRAM), and Rambus Dynamic RAM (RDRAM), among others.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. The scope of the invention is to be determined by the scope of the appended claims.

Claims

1. A four-way reversing valve fault detection method is characterized by comprising the following steps:

determining whether at least one of the following judgment conditions is satisfied according to the change of the current fluid pressure relative to the previous fluid pressure and the operation state of the current operation mode: a fluid pressure sudden change corresponding to a first change-over valve port that switches between the high-pressure passage and the low-pressure passage based on a change in the position of the valve element, a fluid pressure sudden change corresponding to a second change-over valve port that switches between the high-pressure passage and the low-pressure passage based on a change in the position of the valve element, and a fluid pressure fluctuation corresponding to a first inlet port connected to the low-pressure passage;

if yes, determining that the four-way reversing valve has a fault.

2. The four-way reversing valve fault detection method of claim 1, wherein said determining that the four-way reversing valve is faulty comprises:

3. The four-way reversing valve fault detection method of claim 2, wherein said determining that the four-way reversing valve is faulty, further comprises:

and outputting fault prompt information of the four-way reversing valve fault.

4. The four-way reversing valve fault detection method of claim 1, wherein determining whether at least one of the following criteria is met based on the change in current fluid pressure relative to the previous fluid pressure and the operating state of the current operating mode comprises:

if the current heat pump mode is in the continuous operation period, determining whether at least one of the following judgment conditions is met according to the change of the current fluid pressure relative to the previous fluid pressure:

the change in fluid pressure corresponding to the first inlet port connected to the low-pressure passage exceeds the first fluctuation threshold.

5. The four-way reversing valve fault detection method of claim 4, further comprising:

6. The four-way reversing valve fault detection method of claim 1, wherein determining whether at least one of the following criteria is met based on the change in current fluid pressure relative to the previous fluid pressure and the operating state of the current operating mode comprises:

if the current working mode is in the continuous operation period of the refrigeration mode, determining whether at least one of the following judgment conditions is met according to the change of the current fluid pressure relative to the previous fluid pressure:

the fluid pressure corresponding to a second reversing valve port which is switched between the high-pressure passage and the low-pressure passage based on the valve core position change is increased relative to the prior fluid pressure, and the difference value between the current fluid pressure corresponding to the second reversing valve port and the pressure value in the high-pressure passage meets a fourth preset condition;

7. The four-way reversing valve fault detection method of claim 6, further comprising:

8. The four-way reversing valve fault detection method according to any one of claims 1 to 7, wherein said determining whether at least one of the following determination conditions is satisfied before the determination based on the change in the current fluid pressure with respect to the previous fluid pressure and the operating state of the current operating mode comprises:

9. The utility model provides a four-way reversing valve fault detection device which characterized in that includes:

and the fault judgment module is used for determining whether at least one of the following judgment conditions is met or not according to the change of the current fluid pressure relative to the previous fluid pressure and the operation state of the current operation mode: a fluid pressure sudden change corresponding to a first change-over valve port that switches between the high-pressure passage and the low-pressure passage based on a change in the position of the valve element, a fluid pressure sudden change corresponding to a second change-over valve port that switches between the high-pressure passage and the low-pressure passage based on a change in the position of the valve element, and a fluid pressure fluctuation corresponding to a first inlet port connected to the low-pressure passage;

10. A heat exchange system comprises a four-way reversing valve and a fluid pipeline correspondingly connected with a valve port of the four-way reversing valve, and is characterized by further comprising a pressure sensor correspondingly connected with a specified valve port of the four-way reversing valve and a controller connected with the pressure sensor;

the controller is configured to execute the four-way reversing valve fault detection method of any one of claims 1 to 8.

11. A cold-warm air conditioning device comprises a controller, a four-way reversing valve, a compressor, an evaporator, a condenser and a throttling device, and is characterized in that a first reversing valve port and a second reversing valve port are respectively connected with the evaporator and the condenser, the throttling device is connected between the evaporator and the condenser, the first valve inlet port is connected with the compressor, and the four-way reversing valve further comprises a second valve inlet port connected with the compressor; the cold and warm air conditioning equipment further comprises a pressure sensor which is arranged corresponding to the first reversing valve port, the second reversing valve port, the first valve inlet port and the second valve inlet port;

12. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, causes the processor to perform the four-way reversing valve fault detection method of any one of claims 1 to 8.