Patent Application
20250012467
The application claims the benefit of China Patent Application No. CN202310837086.2 filed Jul. 7, 2023, the contents of which are hereby incorporated in their entirety.
The present invention relates to the field of air conditioners, and in particular to a protection method and device for high-temperature prevention during heating and refrigerant shortage during heating, and an air conditioning system.
An air conditioner provides heating in a high-temperature environment, and due to a high temperature of an indoor-unit heat exchanger, in order to avoid damage to a compressor due to excessive pressure, an outdoor fan needs to be stopped intermittently to actively unload during heating.
The existing means for preventing high temperature during heating includes: collecting the temperature of the indoor heat exchanger, comparing the temperature with a preset parameter, and performing high-temperature prevention and stopping the outdoor fan if the temperature of the indoor heat exchanger is higher than the preset parameter. The temperature of the indoor heat exchanger is controlled by an indoor-unit mainboard of an air conditioner, and thus, indoor unit and outdoor unit communication is required to control the start and stop of an outdoor compressor. For some fixed-frequency air conditioning systems without indoor unit and outdoor unit communication, the high-temperature prevention control cannot be realized. In addition, the temperature of the indoor heat exchanger serves as the main or only control factor. When the temperature of the indoor heat exchanger is abnormal, the temperature drop time of the indoor heat exchanger is too long and the design of protection temperature parameters is unreasonable, the high-temperature prevention control will fail, thereby affecting the service life of the compressor.
In view of the above problems, the present invention provides a protection method and device for high-temperature prevention during heating and refrigerant shortage during heating, and an air conditioning system. The indoor-unit temperature can be replaced to determine whether to enter high-temperature prevention without the need for indoor unit and outdoor unit communication, and the accuracy of high-temperature prevention determination is ensured, allowing the air conditioning system to enter a high-temperature prevention mode in time, and thus improving the operation reliability of the air conditioner. Furthermore, the excessively high exhaust temperature caused by refrigerant shortage can be excluded, to avoid accidentally entering the high-temperature prevention mode due to refrigerant shortage and improve the operation stability and reliability of the air conditioning system.
The present invention provides a protection method for high-temperature prevention during heating and refrigerant shortage during heating of an air conditioning system. The air conditioning system includes an indoor unit and an outdoor unit, and the outdoor unit at least includes a compressor and an outdoor fan. The protection method includes the following steps:
According to the technical solution, corresponding compensation temperatures are preset respectively according to different outdoor ambient temperatures to compensate the exhaust temperature, so that the compensated exhaust temperature can reflect the temperature state of the indoor unit. In this way, the indoor-unit temperature can be replaced to determine whether to enter high-temperature prevention without the need for indoor unit and outdoor unit communication, and the accuracy of high-temperature prevention determination is ensured, allowing the air conditioning system to enter a high-temperature prevention mode in time, and thus improving the operation reliability of the air conditioner. In addition, whether there is refrigerant shortage is determined according to a comparison result of the compensated exhaust temperature and the preset temperature, and the excessively high exhaust temperature caused by refrigerant shortage is excluded, so that the misoperation of entering high-temperature prevention as determined only by means of the exhaust temperature can be avoided, improving the accuracy of entry of high-temperature prevention. Furthermore, a fault is reported in time in a case of refrigerant shortage, improving the operation stability and reliability of the air conditioning system.
In an optional technical solution of the present invention, the air conditioning system is a fixed-frequency air conditioning system without indoor unit and outdoor unit communication.
In an optional technical solution of the present invention, in the high-temperature prevention determination step, the association of the compensation temperature with the outdoor ambient temperature includes:
According to the technical solution, a plurality of temperature intervals and a plurality of compensation temperatures are set, which is beneficial for improving the accuracy of determination of high-temperature prevention and refrigerant shortage.
In an optional technical solution of the present invention, in the refrigerant leakage determination step, the second preset temperature ranges from 90° C. to 110° C.
According to the technical solution, after the outdoor fan stops operating in the high-temperature prevention mode, normally, the exhaust temperature will decrease due to the deterioration of evaporation, thereby achieving the purpose of high-temperature prevention. However, in the case of serious refrigerant shortage in the system, the exhaust temperature is not sufficiently cooled through refrigerant circulation, and the exhaust temperature will continue to rise due to the heating of the compressor. Therefore, whether the outdoor fan operates has little influence on the exhaust temperature. When the exhaust temperature is excessively high, it can be determined that the increase of the exhaust temperature is caused by refrigerant shortage.
In an optional technical solution of the present invention, the outdoor unit further includes an outdoor heat exchanger; and the protection method further includes:
According to the technical solution, when the outdoor fan stops in the high-temperature prevention mode, the deterioration of the evaporation effect of the outdoor unit and the decrease of the exhaust temperature will be caused usually, thereby achieving the purpose of high-temperature prevention. When the shutdown duration is greater than the third preset duration, the outdoor fan is forced to start, which can avoid the slow decrease in exhaust temperature under high-temperature conditions or due to thermal inertia of the temperature of the outdoor heat exchanger and dirty blockage of the outdoor heat exchanger, causing the air conditioning system to be in the high-temperature prevention mode for a long time and the evaporation effect of the outdoor unit to deteriorate, resulting in freezing, and the air conditioner performs frosting and defrosting actions, improving user experience. Or, when the sum of the exhaust temperature and the compensation temperature is less than the third preset temperature, that is, when the exhaust temperature drops significantly, the high-temperature prevention is exited to allow the outdoor fan to operate normally and ensure the evaporation effect of the outdoor unit; or, when the outlet temperature of the outdoor heat exchanger is lower than the outdoor ambient temperature to a certain extent, that is, it means that the evaporation effect has deteriorated, the exhaust temperature will decrease, high-temperature prevention can be thus achieved. Further, when the difference between the outdoor ambient temperature and the outlet temperature of the outdoor heat exchanger is greater than the first temperature difference threshold, the outdoor fan is started in time to improve the evaporation effect and prevent the outdoor unit from being frosted. Any of the conditions can be chosen according to the actual situation to exit the high-temperature prevention protection, which is highly flexible and is conducive to the reliable operation of the air conditioning system and improves user experience.
In an optional technical solution of the present invention, the third preset duration ranges from 3 to 10 min.
According to the technical solution, an appropriate duration is selected, which can avoid the deterioration of the evaporation effect and the influence on the heating effect due to the long-time operation of the high-temperature prevention mode.
In an optional technical solution of the present invention, the third preset temperature ranges from 70° C. to 90° C.
According to the technical solution, an appropriate exhaust temperature range is selected, which enables the high-temperature prevention protection mode to be exited in time when the exhaust temperature is reduced to a certain extent, thereby ensuring the reliable operation of the air conditioning system and improving the user experience.
In an optional technical solution of the present invention, the first temperature difference threshold ranges from 10° C. to 40° C.
According to the technical solution, an appropriate first temperature difference threshold is selected, which can avoid the frequent entry of the high-temperature prevention protection caused by the excessively high outlet temperature of the outdoor heat exchanger or the frosting of the outdoor heat exchanger caused by the excessively low outlet temperature of the outdoor heat exchanger, thereby prolonging the service life of the air conditioner and improving the user experience.
Another aspect of the present invention provides a protection device for high-temperature prevention during heating and refrigerant shortage during heating of an air conditioning system, including:
a refrigerant shortage protection entry module, configured to: when the sum of the exhaust temperature and the compensation temperature is greater than the second preset temperature for the second duration, control the compressor to stop and report a fault.
Another aspect of the present invention provides an air conditioning system, including the protection device for high-temperature prevention during heating and refrigerant shortage during heating of an air conditioning system as described above.
The technical solutions in embodiments of the present invention are described clearly and completely below with reference to the accompanying drawings in embodiments of the present invention. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any creative efforts shall fall within the protection scope of the present invention.
As shown in
As shown in
In the above manner, corresponding compensation temperatures are preset respectively according to different outdoor ambient temperatures to compensate the exhaust temperature, so that the compensated exhaust temperature can reflect the temperature state of the indoor unit. In this way, the indoor-unit temperature can be replaced to determine whether to enter high-temperature prevention without the need for indoor unit and outdoor unit communication, and the accuracy of high-temperature prevention determination is ensured, allowing the air conditioning system to enter a high-temperature prevention mode in time, and thus improving the operation reliability of the air conditioner, and saving the cost of the communication line between the indoor and outdoor units. The temperature detector is a part of the system itself, so there is no additional cost. In addition, whether there is refrigerant shortage is determined according to a comparison result of the compensated exhaust temperature and the preset temperature, and the excessively high exhaust temperature caused by refrigerant shortage can be excluded, to avoid accidentally entering the high-temperature prevention mode due to refrigerant shortage. Furthermore, a fault is reported in time in a case of refrigerant shortage, improving the operation stability of the air conditioning system.
In a preferred embodiment of the present invention, in the high-temperature prevention determination step, the association of the compensation temperature with the outdoor ambient temperature includes:
In the above manner, a plurality of temperature intervals and a plurality of compensation temperatures are set, which is beneficial for improving the accuracy of determination of high-temperature prevention and refrigerant shortage. The technician can adjust the temperature threshold and compensation temperature value according to actual conditions. Preferably, the first compensation temperature ranges from −5° C. to 5° C., the second compensation temperature ranges from −5° C. to 5° C., and the third compensation temperature ranges from −5° C. to 5° C.
In a preferred embodiment of the present invention, in the high-temperature prevention determination step, the first preset temperature ranges from 70° C. to 100° C., preferably 82° C. (the first preset temperature is the exhaust temperature corresponding to the indoor heat exchanger temperature of 55° C. According to different types of the compressor, the exhaust temperature corresponding to the indoor heat exchanger temperature of 55° C. may be different. The technician can adaptively adjust the first preset temperature).
In a preferred embodiment of the present invention, in the refrigerant leakage determination step, the second preset temperature ranges from 90° C. to 110° C., preferably 105° C. In the above manner, after the outdoor fan stops operating in the high-temperature prevention mode, normally, the exhaust temperature will decrease due to the deterioration of evaporation, thereby achieving the purpose of high-temperature prevention. However, in the case of serious refrigerant shortage in the system, the exhaust temperature is not sufficiently cooled through refrigerant circulation, and the exhaust temperature will continue to rise due to the heating of the compressor. Therefore, whether the outdoor fan operates has little influence on the exhaust temperature. When the exhaust temperature is excessively high, it can be determined that the increase of the exhaust temperature is caused by refrigerant shortage. Furthermore, the second preset temperature is lower than the normal exhaust protection temperature of the compressor (generally 115° C.), so that the compressor 11 can be protected in time in case of refrigerant shortage, thereby prolonging the service life of the compressor 11.
In a preferred embodiment of the present invention, the protection method further includes:
In the above manner, when the outdoor fan stops in the high-temperature prevention mode, the deterioration of the evaporation effect of the outdoor unit and the decrease of the exhaust temperature will be caused usually, thereby achieving the purpose of high-temperature prevention. When the shutdown duration is greater than the third preset duration, the outdoor fan is forced to start, which can avoid the slow decrease in exhaust temperature under high-temperature conditions or due to thermal inertia of the temperature of the outdoor heat exchanger and dirty blockage of the outdoor heat exchanger, causing the air conditioning system to be in the high-temperature prevention mode for a long time and the evaporation effect of the outdoor unit to deteriorate, and the air conditioner performs frosting and defrosting actions. Or, when the sum of the exhaust temperature and the compensation temperature is less than the third preset temperature, that is, when the exhaust temperature drops significantly, the high-temperature prevention is exited to allow the outdoor fan to operate normally and ensure the evaporation effect of the outdoor unit; or, when the outlet temperature of the outdoor heat exchanger is lower than the outdoor ambient temperature to a certain extent, that is, it means that the evaporation effect has deteriorated, the exhaust temperature will decrease, high-temperature prevention can be thus achieved. Further, when the difference between the outdoor ambient temperature and the outlet temperature of the outdoor heat exchanger is greater than the first temperature difference threshold, the outdoor fan is started in time to improve the evaporation effect and prevent the outdoor unit from being frosted. Any of the conditions can be chosen according to the actual situation to exit the high-temperature prevention protection, which is highly flexible and is conducive to the reliable operation of the air conditioning system and improves user experience.
In a preferred embodiment of the present invention, the third preset duration ranges from 3 to 10 min, preferably 6 min. An appropriate duration is selected, which can avoid the deterioration of the evaporation effect and the influence on the heating effect due to the long-time operation of the high-temperature prevention mode.
In a preferred embodiment of the present invention, the third preset temperature ranges from 70° C. to 90° C., preferably 76° C. (the third preset temperature is the exhaust temperature corresponding to the indoor heat exchanger temperature of 48° C. According to different types of the compressor, the exhaust temperature corresponding to the indoor heat exchanger temperature of 48° C. may be different. The technician can adaptively adjust the third preset temperature).
An appropriate exhaust temperature range is selected, which enables the high-temperature prevention protection mode to be exited in time when the exhaust temperature is reduced to a certain extent, thereby ensuring the reliable operation of the air conditioning system and improving the user experience.
In a preferred embodiment of the present invention, the first temperature difference threshold ranges from 10° C. to 40° C., preferably 30° C.
In the above manner, an appropriate first temperature difference threshold is selected, which can avoid the frequent entry of the high-temperature prevention protection caused by the excessively high outlet temperature of the outdoor heat exchanger or the frosting of the outdoor heat exchanger caused by the excessively low outlet temperature of the outdoor heat exchanger, thereby prolonging the service life of the air conditioner and improving the user experience.
It should be noted that although this embodiment describes the above protection method that is applied to a fixed-frequency machine system under the non-communication condition, it is conceivable that it can also be applied to a fixed-frequency machine system.
As shown in
Specifically, in this embodiment, the detection module may include a temperature detection module such as a temperature-sensitive package and a temperature sensor, a current meter for detecting the fan current, and a timer for detecting the shutdown duration. The high-temperature prevention determination module and the refrigerant shortage determination module may also be integrated into the controller of the air conditioner. The controller is used to determine whether the air conditioner enters high-temperature prevention and refrigerant shortage protection according to the above operational logics. The high-temperature prevention protection entry module and the refrigerant shortage protection entry module may be integrated into the controller of the air conditioner. The controller is used to control the air conditioner to enter the refrigerant shortage protection according to the comparison result of the exhaust temperature and the second preset temperature, and to control the air conditioner to enter the high-temperature prevention protection according to the comparison result of the sum of the exhaust temperature and the compensation temperature and the first preset temperature, and the comparison result of the fan current and the preset current value. Specifically, the controller may be an integrated circuit chip having a signal processing capability. The controller may be a general-purpose processor, including a central processing unit (CPU), or a single-chip microcomputer, a microcontroller unit (MCU), a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), an application specific integrated circuit (ASIC), an embedded ARM and other chips. The controller may implement or perform each of the methods, steps and logic block diagrams disclosed in the embodiments of the present invention.
In a preferred embodiment of the present invention, the protection device further includes an outdoor fan start control module 66, configured to: determine whether the outdoor fan meets an outdoor fan starting condition; if yes, start the outdoor fa, and if no, operate the high-temperature prevention protection entry module, where the outdoor fan starting condition includes:
It should be noted that the detection module 61, the high-temperature prevention determination module 62, the high-temperature prevention protection entry module 63, the refrigerant shortage determination module 64, the refrigerant shortage protection entry module 65, and the outdoor fan start control module 66 correspond to the detection step, the high-temperature prevention determination step, the high-temperature prevention protection entry step, the refrigerant shortage determination step, the refrigerant shortage protection entry step and the outdoor fan start control step in the above protection method. The implementation examples and application scenarios of the respective modules are the same as those of the corresponding steps, but are not limited to the contents disclosed in the above embodiment.
In a preferred embodiment of the present invention, the association of the compensation temperature with the outdoor ambient temperature includes:
when the outdoor ambient temperature is less than or equal to the second temperature threshold (e.g., 14° C.), the compensation temperature is a third compensation temperature (e.g., 7° C.), and the first temperature threshold is greater than the second temperature threshold.
In the above manner, a plurality of temperature intervals and a plurality of compensation temperatures are set, which is beneficial for improving the accuracy of determination of high-temperature prevention and refrigerant shortage. The technician can adjust the temperature threshold and compensation temperature value according to actual conditions. Preferably, the first compensation temperature ranges from −5° C. to 5° C., the second compensation temperature ranges from −5° C. to 5° C., and the third compensation temperature ranges from −5° C. to 5° C.
In a preferred embodiment of the present invention, the first preset temperature ranges from 70° C. to 100° C., preferably 82° C. The second preset temperature ranges from 90° C. to 110° C., preferably 105° C. The first preset duration is 3 min, the second preset duration is 2 min, and the third preset duration ranges from 3 to 10 min.
Another aspect of the present invention provides an air conditioning system, including the protection device for high-temperature prevention during heating and refrigerant shortage during heating of an air conditioning system as described above.
The present invention further provides a computer-readable storage medium, storing a computer program, which is configured to, when executed, implement the protection method for high-temperature prevention during heating and refrigerant shortage during heating of an air conditioning system as described above. The storage medium includes: a USB flash disk, a read-only memory (ROM), a random-access memory (RAM), a mobile hard disk, a magnetic disk, an optical disk or other media that can store program codes.
The above are merely preferred embodiments of the present invention, and are not used to limit the present invention. Any modifications, combination of embodiments, equivalent replacements, improvements, and the like made within the spirit and principle of the present invention shall be all included within the protection scope of the present invention.
While the subject disclosure has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the subject disclosure as defined by the appended claims. Modifications may be made to adopt a particular situation or material to the teachings of the subject disclosure without departing from the scope thereof. Therefore, it is intended that the subject disclosure not be limited to the particular embodiment disclosed, but that the subject disclosure includes all embodiments falling within the scope of the subject disclosure as defined by the appended claims.
In interpreting the specification, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refer to at least one of something selected from the group consisting of A, B, C . . . and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202310837086.2 | Jul 2023 | CN | national |
