CN113007860A - Low-voltage protection control method and device and air conditioner - Google Patents
Low-voltage protection control method and device and air conditioner Download PDFInfo
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- CN113007860A CN113007860A CN202110418275.7A CN202110418275A CN113007860A CN 113007860 A CN113007860 A CN 113007860A CN 202110418275 A CN202110418275 A CN 202110418275A CN 113007860 A CN113007860 A CN 113007860A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention provides a low-voltage protection control method and device and an air conditioner, and relates to the technical field of air conditioners. The low-voltage protection control method comprises the following steps: receiving a return air temperature value, an evaporator outlet temperature value, an oil temperature value and a coil temperature value. And sending a low-pressure protection instruction or a normal operation instruction according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil pipe temperature value so as to control the compressor of the air conditioner to reduce the frequency or stop the air conditioner or control the compressor to normally operate. The invention also provides a low-voltage protection control device and an air conditioner, which can execute the low-voltage protection control method. The low-voltage protection control method, the low-voltage protection control device and the air conditioner provided by the invention can solve the problem that the service life of the compressor is reduced due to frequent starting and stopping or fluctuation of the compressor.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a low-voltage protection control method and device and an air conditioner.
Background
With the development of modern society, inverter air conditioners are more and more favored by consumers. Although the requirements of users on the performance, comfort, noise and the like of the air conditioner are higher and higher, and the requirements are more and more important in the design of the later-stage air conditioner, the requirements on the reliability of the variable-frequency air conditioner are higher and higher in a special use scene and under a special environment temperature.
At present miniature frequency conversion central air conditioning mainly adopts rotor compressor, and rotor compressor does not possess superstrong anti liquid impact ability because its self characteristic, and under the low temperature environment of heating, the compressor starts for the first time, because the compressor return-air inlet gathers a large amount of liquid refrigerant, can have the risk of low pressure, and often for guaranteeing air conditioning system's stability, general compressor can set up the start-up platform and guarantee certain frequency output.
However, in the process of starting the platform of the compressor, if the set starting platform is not reasonable, the low-pressure is suddenly reduced, and the compressor is controlled to reduce the frequency or stop the frequency to protect the reliability of the whole system, so that the requirements of users on quick cooling and quick heating cannot be met, and the compressor can be frequently started, stopped or fluctuated to influence the service life of the compressor.
Disclosure of Invention
The invention solves the problem of how to improve the problem of the reduction of the service life of the compressor caused by the frequent start-stop or fluctuation of the compressor.
In order to solve the above problems, the present invention provides a low voltage protection control method, which is applied to an air conditioner, and the low voltage protection control method includes:
receiving a return air temperature value, an evaporator outlet temperature value, an oil temperature value and a coil pipe temperature value; the return air temperature value represents the temperature of a refrigerant in a return air pipe of a compressor of the air conditioner, the evaporator outlet temperature value represents the temperature of the refrigerant at the outlet of an evaporator in an indoor unit of the air conditioner, the oil temperature value represents the oil temperature at the bottom of the compressor, and the coil pipe temperature value represents the temperature of the evaporator;
and sending a low-pressure protection instruction or a normal operation instruction according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil temperature value, wherein the low-pressure protection instruction is configured to control a compressor of the air conditioner to be frequency-reduced or shut down, and the normal operation instruction is configured to control the compressor to normally operate.
Compared with the prior art, the low-voltage protection control method provided by the invention has the beneficial effects that:
because the general compressor has certain liquid impact resistance, the liquid return in a short time can not affect the compressor; in addition, whether the refrigeration oil is diluted or not can cause great influence on the service life and the reliability of the compressor, and whether the liquid returns inside the compressor or not can be judged according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil pipe temperature value under the condition that the air conditioner operates the low-pressure protection control method, and whether the refrigeration oil inside the compressor is diluted or not can be judged. Therefore, the running parameters of the compressor are adjusted through the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil pipe temperature value, the influence on the service life of the compressor caused by frequent frequency reduction or frequent start and stop of the compressor can be prevented, and the overall reliability of the air conditioner can be prevented from being reduced. Therefore, the problem that the service life of the compressor is reduced due to frequent starting and stopping or fluctuation of the compressor is solved.
Optionally, the step of sending a low-pressure protection instruction or a normal operation instruction according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value, and the coil temperature value includes:
judging whether the return air temperature value and the evaporator outlet temperature value meet a first preset condition or not;
if the return air temperature value and the evaporator outlet temperature value meet the first preset condition, judging whether the oil temperature value and the coil temperature value meet a second preset condition or not;
if the oil temperature value and the coil temperature value meet the second preset condition, a low-pressure protection instruction is sent out to control the compressor to reduce the frequency or stop the compressor;
if the return air temperature value and the evaporator outlet temperature value do not meet the first preset condition, or if the oil temperature value and the coil temperature value do not meet the second preset condition, a normal operation instruction is sent out to control the compressor to normally operate.
Optionally, the step of determining whether the return air temperature value and the evaporator outlet temperature value satisfy a first preset condition includes:
calculating a return air superheat value according to the return air temperature value and the evaporator outlet temperature value, wherein the return air superheat value represents a return air superheat degree of an outdoor unit of the air conditioner;
judging whether the return air superheat value is smaller than or equal to a preset return air superheat value or not;
and if the return air superheat value is smaller than or equal to the preset return air superheat value, the return air temperature value and the evaporator outlet temperature value meet the first preset condition.
Optionally, the step of calculating a return air superheat value from the return air temperature value and the evaporator outlet temperature value comprises:
and calculating the return air temperature value minus the evaporator outlet temperature value to obtain the return air superheat value.
Optionally, the step of determining whether the oil temperature value and the coil temperature value satisfy a second preset condition includes:
calculating an oil temperature superheat value according to the oil temperature value and the coil temperature value, wherein the oil temperature superheat value represents an oil temperature superheat degree of an outdoor unit of the air conditioner;
judging whether the oil temperature overheating value is smaller than or equal to a preset oil temperature overheating value;
and if the oil temperature overheating value is smaller than or equal to the preset oil temperature overheating value, the oil temperature value and the coil temperature value meet the second preset condition.
Optionally, the step of calculating an oil temperature superheat value from the oil temperature value and the coil temperature value comprises:
and calculating the oil temperature value minus the coil temperature value to obtain the oil temperature overheating value.
The return air superheat degree of the air conditioner can be obtained through the return air temperature value and the evaporator outlet temperature value, and whether the liquid returns to the compressor or not is effectively judged according to the return air superheat degree; in addition, the oil temperature superheat degree of the air conditioner can be obtained through the oil temperature value and the coil pipe temperature value, and whether the refrigeration oil of the compressor is diluted or not is effectively judged according to the oil temperature superheat degree. Therefore, the compressor can be effectively controlled to enter a low-pressure protection state or to normally run according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil pipe temperature value, and the compressor can be prevented from being started or stopped frequently or from being lowered frequently. In addition, the step of judging whether the compressor returns liquid or not according to the return air superheat degree of the compressor is placed before the step of judging whether the refrigeration oil of the compressor is diluted or not according to the oil temperature superheat degree of the compressor, the normal operation of the compressor can be directly controlled under the condition that the compressor does not return liquid, the execution frequency of starting and stopping the compressor or reducing the frequency can be reduced, and therefore the problem that the service life of the compressor is reduced due to frequent starting and stopping or fluctuation of the compressor is solved.
Optionally, before the step of issuing a low-pressure protection command or a normal operation command according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value, and the coil temperature value, the low-pressure protection control method further includes:
obtaining a run time value, wherein the run time value represents a run time after the compressor is started;
judging whether the running time value is less than or equal to a preset time value or not;
if the running time value is less than or equal to the preset time value, a low-pressure protection instruction or a normal running instruction is sent out according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil temperature value;
and if the running time value is greater than the preset time value, sending the normal running instruction to control the compressor to run normally.
When the operation time of the compressor is long enough, the compressor is not considered to have the problem that a large amount of liquid refrigerant is accumulated in the return port, so that the condition that the liquid refrigerant of the compressor is returned due to the accumulation of the large amount of liquid refrigerant in the return port of the compressor is avoided, and the normal operation of the compressor can be controlled. In addition, when the starting time of the compressor is less than the preset time value, the problem that a large amount of liquid refrigerant is possibly accumulated in the air return port of the compressor is represented, so that whether liquid returns inside the compressor can be judged according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil pipe temperature value, and whether the refrigeration oil inside the compressor is diluted can be judged; and the compressor is controlled to enter a low-pressure protection state or a normal operation state, so that the problem that the service life of the compressor is reduced due to frequent starting, stopping or fluctuation of the compressor in the prior art can be solved.
Optionally, before the step of receiving the return air temperature value, the evaporator outlet temperature value, the oil temperature value, and the coil temperature value, the low pressure protection control method further comprises:
judging whether the operation mode of the air conditioner is a heating mode or not;
and if so, executing the step of receiving the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil temperature value.
A low voltage protection control device comprising:
a receiving module configured to receive a return air temperature value, an evaporator outlet temperature value, an oil temperature value, and a coil temperature value; the return air temperature value represents the temperature of a refrigerant in a return air pipe of a compressor of the air conditioner, the evaporator outlet temperature value represents the temperature of the refrigerant at the outlet of an evaporator in an indoor unit of the air conditioner, the oil temperature value represents the oil temperature at the bottom of the compressor, and the coil pipe temperature value represents the temperature of the evaporator;
a control module configured to issue a low-pressure protection instruction or a normal operation instruction according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value, and the coil temperature value, wherein the low-pressure protection instruction is configured to control a compressor of the air conditioner to be frequency-reduced or shut down, and the normal operation instruction is configured to control the compressor to normally operate.
An air conditioner includes a controller configured to perform a low voltage protection control method. The low-voltage protection control method comprises the following steps:
receiving a return air temperature value, an evaporator outlet temperature value, an oil temperature value and a coil pipe temperature value; the return air temperature value represents the temperature of a refrigerant in a return air pipe of a compressor of the air conditioner, the evaporator outlet temperature value represents the temperature of the refrigerant at the outlet of an evaporator in an indoor unit of the air conditioner, the oil temperature value represents the oil temperature at the bottom of the compressor, and the coil pipe temperature value represents the temperature of the evaporator;
and sending a low-pressure protection instruction or a normal operation instruction according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil temperature value, wherein the low-pressure protection instruction is configured to control a compressor of the air conditioner to be frequency-reduced or shut down, and the normal operation instruction is configured to control the compressor to normally operate.
The invention also provides a low-voltage protection control device and an air conditioner, wherein the low-voltage protection control device and the air conditioner can execute the low-voltage protection control method, and the beneficial effects of the low-voltage protection control device and the air conditioner relative to the prior art are the same as the beneficial effects of the low-voltage protection control method relative to the prior art, and are not repeated herein.
Drawings
Fig. 1 is a block diagram of an air conditioner provided in an embodiment of the present application;
FIG. 2 is a flow chart of a method of low voltage protection provided in an embodiment of the present application;
fig. 3 is a flowchart of step S20 in the low voltage protection method provided in the embodiment of the present application;
fig. 4 is a flowchart of step S210 in the low voltage protection method provided in the embodiment of the present application;
fig. 5 is a flowchart of step S220 in the low voltage protection method provided in the embodiment of the present application;
FIG. 6 is another partial flow chart of a method of low voltage protection provided in an embodiment of the present application;
fig. 7 is a functional block diagram of a low-voltage protection control device according to an embodiment of the present application.
Description of reference numerals:
1-an air conditioner; 2-a controller; 3-a compressor; 4-a first temperature detection device; 5-a second temperature detection device; 6-a third temperature detection device; 7-a fourth temperature detection device; 10-a receiving module; and 20, controlling the module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, in the embodiment of the present application, an air conditioner 1 is provided, and the air conditioner 1 may be configured to be installed in a designated area and provide an air conditioning effect to the designated area, so as to improve the comfort of the designated area and meet the comfort requirement of a user. The air conditioning function that the air conditioner 1 can provide may include, but is not limited to, a temperature adjusting function, a humidity adjusting function, a fresh air function, and an airflow circulation speed adjusting function.
The air conditioner 1 includes an outdoor unit and an indoor unit, the indoor unit being configured to be installed inside a designated area, and the outdoor unit being installed in an area other than the designated area. The indoor unit is connected with the outdoor unit, and the refrigerant can circulate between the indoor unit and the outdoor unit. In addition, the indoor unit is configured to provide air conditioning to a designated area; the outdoor unit is configured to provide a heat exchange place for the refrigerant and to provide power for the circulation of the refrigerant. The outdoor unit includes a compressor 3, and the compressor 3 is configured to compress a refrigerant and output the compressed refrigerant, so that the refrigerant can circulate between the indoor unit and the outdoor unit. The indoor unit is provided with an evaporator which can receive a refrigerant and transmit cold or heat to airflow under the condition that the airflow passes through the evaporator, so that the airflow brings the cold or heat into a specified area to realize the air conditioning effect on the specified area.
In addition, in the embodiment of the present application, the air conditioner 1 further includes a controller 2, and the controller 2 is electrically connected to both the outdoor unit and the indoor unit. The controller 2 is electrically connected to the compressor 3, so that the frequency of the compressor 3 can be controlled by the controller 2 and the compressor 3 can be controlled to start or stop.
It should be noted that the controller 2 may be an integrated circuit chip having signal processing capability. The controller 2 may be a general-purpose processor, and may include a Central Processing Unit (CPU), a single chip Microcomputer (MCU), a Micro Controller 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, where the controller 2 may implement or execute the methods, steps, and Logic blocks disclosed in the embodiments of the present invention.
In a possible implementation manner, the air conditioner 1 may further include a memory for storing program instructions executable by the controller 2, for example, the air conditioning control device provided in the embodiment of the present application, which includes at least one program stored in the memory in the form of software or firmware. The Memory may be a stand-alone external Memory including, but not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Read-Only Memory (EPROM), electrically Erasable Read-Only Memory (EEPROM). The memory may also be integrated with the controller 2, for example the memory may be integrated with the controller 2 in the same chip.
In addition, the air conditioner 1 may further include a first temperature detecting device 4, a second temperature detecting device 5, a third temperature detecting device 6, and a fourth temperature detecting device 7. The first temperature detection device 4 is arranged at the return port of the compressor 3, and the first temperature detection device 4 is configured to detect the temperature of the refrigerant in the return port of the compressor 3, namely a return air temperature value; also, the first temperature detection device 4 is electrically connected to the controller 2 to send the return air temperature value to the controller 2. The second temperature detection device 5 is arranged at the outlet of the evaporator, and the second temperature detection device 5 is configured to detect the temperature of the refrigerant at the outlet of the evaporator, namely an evaporator outlet temperature value; and, the second temperature detecting means 5 is electrically connected to the controller 2 to send the evaporator outlet temperature value to the controller 2. The third temperature detection device 6 is arranged at the bottom of the compressor 3, and the third temperature detection device 6 is configured to detect the oil temperature at the bottom of the compressor 3, namely an oil temperature value; and, the third temperature detecting device 6 is electrically connected with the controller 2 to transmit the oil temperature value to the controller 2. The fourth temperature detection device 7 is arranged on the evaporator, and the fourth temperature detection device 7 is configured to detect the temperature of the evaporator, namely the temperature value of the coil; and, the fourth temperature detection device 7 is electrically connected with the controller 2 to send the coil temperature value to the controller 2.
In the prior art, when the compressor 3 is started for the first time, a large amount of liquid refrigerant is collected at the return air port of the compressor 3, and therefore the liquid refrigerant may flow into the compressor 3, which may damage the compressor 3. Therefore, in order to ensure the operation stability of the entire air conditioner 1, the stability of the entire air conditioner 1 is generally protected by down-clocking or stopping the compressor 3, thereby causing frequent start-stop or fluctuation of the compressor 3, affecting the life of the compressor 3.
In order to improve the above technical problem, the air conditioner 1 of the present application is provided. Based on the air conditioner 1 provided above, the present application further provides a low-voltage protection control method to solve the problem of the reduction of the service life of the compressor 3 caused by frequent start-stop or fluctuation of the compressor 3 in the prior art. Referring to fig. 2, the low voltage protection control method includes:
and step S10, receiving a return air temperature value, an evaporator outlet temperature value, an oil temperature value and a coil temperature value.
Wherein, the return air temperature value, evaporimeter export temperature value, oil temperature value and coil pipe temperature value are in proper order by first temperature-detecting device 4, second temperature-detecting device 5, third temperature-detecting device 6 and fourth temperature-detecting device 7 detect, and at first temperature-detecting device 4, second temperature-detecting device 5, third temperature-detecting device 6 and fourth temperature-detecting device 7 detect the return air temperature value, evaporimeter export temperature value, behind oil temperature value and the coil pipe temperature value, with the return air temperature value, evaporimeter export temperature value, oil temperature value and coil pipe temperature value send controller 2, receive the return air temperature value by controller 2, evaporimeter export temperature value, oil temperature value and coil pipe temperature value.
In some embodiments of the present application, before step S10, the low voltage protection control method may further include:
step S02 is to determine whether the operation mode of the air conditioner 1 is the heating mode.
It should be noted that, when the air conditioner 1 operates in the heating mode, the refrigerant led out from the compressor 3 is directly led into the evaporator, so that whether the compressor 3 returns liquid or whether the refrigerant oil of the compressor 3 is diluted can be effectively determined by the evaporator outlet temperature value and the coil temperature value, thereby improving the accuracy of determination.
Therefore, in step S02, if the determination result is yes, step S10 is executed, in other words, if the air conditioner 1 is operated in the heating mode, step S10 may be executed.
After step S10, the low-voltage protection control method further includes:
and step S20, sending a low-pressure protection instruction or a normal operation instruction according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil pipe temperature value.
It should be noted that the low pressure protection command is configured to control the compressor 3 to enter the low pressure protection state, in other words, the controller 2 may control the compressor 3 to decrease the frequency or control the compressor 3 to stop according to the low pressure protection command. The normal operation command is configured to control the compressor 3 to operate normally, in other words, the controller 2 may control the compressor 3 to operate normally according to the normal operation command to ensure that an effective air conditioning effect is provided to a designated area.
As described above, since the general compressor 3 has a certain liquid impact resistance, the liquid return in a short time does not affect the compressor 3; in addition, whether the refrigeration oil is diluted or not has a great influence on the service life and reliability of the compressor 3, and whether the liquid returns inside the compressor 3 or not can be judged according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil pipe temperature value under the condition that the air conditioner 1 operates the low-pressure protection control method, and whether the refrigeration oil inside the compressor 3 is diluted or not can be judged. Therefore, the running parameters of the compressor 3 are adjusted together through the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil pipe temperature value, so that the influence of frequent frequency reduction or frequent start-stop of the compressor 3 on the service life of the compressor 3 can be prevented, and the overall reliability of the air conditioner 1 can be prevented from being reduced. Therefore, the problem that the service life of the compressor 3 is reduced due to frequent start-stop or fluctuation of the compressor 3 is solved.
Alternatively, referring to fig. 3, step S20 includes:
step S210, judging whether the return air temperature value and the evaporator outlet temperature value meet a first preset condition.
Alternatively, referring to fig. 4, step S210 may include:
and step S211, calculating a return air superheat value according to the return air temperature value and the evaporator outlet temperature value.
It should be noted that the return air superheat value indicates a return air superheat of an outdoor unit of the air conditioner 1, and the return superheat is a criterion for determining whether the compressor 3 returns liquid, in other words, whether the compressor 3 returns liquid can be accurately determined by the return air superheat value, and therefore, whether the compressor 3 returns liquid can be determined by the return air superheat value.
Alternatively, the manner of calculating the return air superheat value in step S211 may be: and calculating the return air temperature value minus the evaporator outlet temperature value to obtain a return air superheat value.
Step S212, judging whether the return air superheat value is smaller than or equal to a preset return air superheat value.
When the return air superheat degree is smaller than the preset return air superheat degree value, the return air superheat degree of the outdoor unit is high, that is, no obvious liquid return phenomenon exists in the compressor 3.
Optionally, in some embodiments of the present application, in order to enable the preset return-air superheat value to be used as an effective judgment standard, so as to improve the accuracy of judging whether the liquid return phenomenon exists in the compressor 3, the preset return-air superheat value may have a value in a range of 0 ℃ to 2 ℃, in other words, the preset return-air superheat value may have a value of 0 ℃, 0.2 ℃, 0.5 ℃, 0.8 ℃, 1 ℃, 1.2 ℃, 1.5 ℃, 1.8 ℃ or 2 ℃, and the like.
Therefore, after step S212, the low-voltage protection control method includes:
step S213, if the return air superheat value is smaller than or equal to the preset return air superheat value, the return air temperature value and the evaporator outlet temperature value meet a first preset condition.
In other words, if the return-air superheat value is greater than the preset return-air superheat value, it indicates that the return-air temperature value and the evaporator outlet temperature value do not satisfy the first preset condition.
In addition, referring to fig. 3, after step S210, the low voltage protection control method includes:
and S220, if the return air temperature value and the evaporator outlet temperature value meet a first preset condition, judging whether the oil temperature value and the coil temperature value meet a second preset condition.
In other words, if the determination result in step S210 is yes, the step of determining whether the oil temperature value and the coil temperature value satisfy the second preset condition is executed.
Optionally, in step S220, the returned air temperature value and the evaporator outlet temperature value satisfy a first preset condition, and the returned air superheat value calculated in step S211 is smaller than or equal to a preset returned air superheat value. Also, referring to fig. 5, optionally, the step of determining whether the oil temperature value and the coil temperature value satisfy the second preset condition may include:
and step S221, calculating an oil temperature overheating value according to the oil temperature value and the coil pipe temperature value.
The oil temperature superheat value indicates the oil temperature superheat of the outdoor unit of the air conditioner 1, in other words, the oil temperature superheat of the compressor 3. The oil temperature superheat degree of the compressor 3 can be used as an important index for judging whether the refrigeration oil in the compressor 3 is diluted, so that whether the refrigeration oil at the bottom of the compressor 3 is diluted can be judged according to the oil temperature superheat degree of the compressor 3.
Alternatively, the manner of calculating the oil temperature overheating value in step S221 may be: and (4) calculating the oil temperature value minus the coil temperature value to obtain an oil temperature overheating value.
Step S222, determining whether the oil temperature overheating value is less than or equal to a preset oil temperature overheating value.
In the case where the oil temperature superheat value is less than or equal to the preset oil temperature superheat value, it indicates that the frozen oil in the compressor 3 is not significantly diluted, and therefore, the influence on the compressor 3 is small.
Alternatively, in order to enable the preset oil temperature superheat value to be used as an effective judgment standard and enable the judgment to be accurately performed as to whether the frozen oil at the bottom of the compressor 3 is diluted or not, the preset oil temperature superheat value may have a value in a range of 10 ℃ to 15 ℃, in other words, the preset oil temperature superheat value may have a value of 10 ℃, 10.5 ℃, 11 ℃, 11.5 ℃, 12 ℃, 12.5 ℃, 13 ℃, 13.5 ℃, 14 ℃, 14.5 ℃ or 15 ℃ or the like.
And S223, if the oil temperature overheating value is smaller than or equal to the preset oil temperature overheating value, the oil temperature value and the coil temperature value meet a second preset condition.
In other words, if the oil temperature overheating value is greater than the preset oil temperature overheating value, it indicates that the oil temperature value and the coil temperature value do not satisfy the second preset condition.
Of course, in some embodiments of the present application, in the case where the determination result in step S210 is no, in other words, in the case where the return air temperature value and the evaporator outlet temperature value do not satisfy the first preset condition, the controller 2 controls the compressor 3 to normally operate.
And step S230, if the oil temperature value and the coil pipe temperature value meet a second preset condition, sending a low-pressure protection instruction.
In other words, when the return air temperature value and the evaporator outlet temperature value satisfy the first preset condition and the oil temperature value and the coil temperature value satisfy the second preset condition, it indicates that the liquid return phenomenon exists in the compressor 3 and the refrigeration oil of the compressor 3 is diluted, which may cause the operation stability and the service life of the compressor 3 to be affected, and therefore, the controller 2 may send a low-pressure protection instruction to control the compressor 3 to reduce the frequency or stop the machine.
Of course, in the case that the determination result in the step S230 is negative, that is, in the case that the oil temperature value and the coil temperature value do not satisfy the second preset condition, the controller 2 issues a normal operation command to control the compressor 3 to operate normally.
It should be noted that the control method in steps S210 to S230 may also be regarded as that, when the return air temperature value and the evaporator outlet temperature value are used as determination factors and when the oil temperature value and the coil temperature value are used as determination factors, any one of the values that does not satisfy the corresponding condition controls the compressor 3 to normally operate, and only when the return air temperature value and the evaporator outlet temperature value satisfy the first preset condition and the oil temperature value and the coil temperature value satisfy the second preset condition controls the compressor 3 to operate under low-pressure protection, so as to prevent the compressor 3 from being frequently started or stopped or the operating frequency from being frequently reduced, thereby improving the problem that the compressor 3 is frequently started or stopped or fluctuates to cause the reduction of the service life of the compressor 3.
In addition, the step of judging whether the compressor 3 returns liquid or not according to the return air superheat degree of the compressor 3 is placed before the step of judging whether the refrigeration oil of the compressor 3 is diluted or not according to the oil temperature superheat degree of the compressor 3, the compressor 3 can be directly controlled to normally operate under the condition that the liquid return state of the compressor 3 does not occur, the execution frequency of starting and stopping the compressor 3 or reducing the frequency can be reduced, and therefore the problem that the service life of the compressor 3 is reduced due to frequent starting and stopping or fluctuation of the compressor 3 is solved.
Referring to fig. 6, in some embodiments of the present application, to improve the determination accuracy, before step S20, the low voltage protection control method may further include:
and step S12, acquiring the running time value.
Wherein the operation time value represents an operation time after the start of the compressor 3. The running time value can be directly obtained from the compressor 3 through the controller 2, in other words, in the case that the compressor 3 is just started, the controller 2 starts timing according to the condition that the compressor 3 is started, so that the controller 2 can directly obtain the running time value of the compressor 3. Of course, in other embodiments of the present application, a timing device may be provided on the compressor 3, and the timing device may record the running time value of the compressor 3; and the timing device is electrically connected to the controller 2 to send the running time value to the control.
And step S14, judging whether the running time value is less than or equal to the preset time value.
It should be noted that, the above-mentioned technical problem occurs when the compressor 3 is just started, and since a large amount of liquid refrigerant is accumulated in the return air port of the compressor 3 when the compressor 3 is just started, a liquid return phenomenon may occur in the compressor 3, and the refrigerant of the compressor 3 may be diluted, so that the above-mentioned problem caused by the just started compressor 3 can be eliminated when the operation time of the compressor 3 is sufficiently long.
In other words, after step S14, the low-voltage protection control method includes:
and step S16, if the operation time value is less than or equal to the preset time value, executing the step of sending a low-pressure protection instruction or a normal operation instruction according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil temperature value.
In other words, if the determination result in the step S14 is yes, it indicates that the time for starting the compressor 3 is short, so the above problem may be caused, and in this case, the method in the step S20 may be executed to determine whether the low pressure protection needs to be performed on the compressor 3.
Of course, after step S14, the low voltage protection control method further includes:
and step S18, if the running time value is larger than the preset time value, sending a normal running instruction.
When the operation time value is greater than the preset time value, the operation time of the compressor 3 is long enough, and it can be determined that the compressor 3 does not have the problem that a large amount of liquid refrigerant is accumulated in the return port, so that the liquid return of the compressor 3 due to the large amount of liquid refrigerant accumulated in the return port of the compressor 3 is avoided, and the normal operation of the compressor 3 can be controlled. In addition, when the starting time of the compressor 3 is less than the preset time value, the problem that a large amount of liquid refrigerant is accumulated in the air return port of the compressor 3 is represented, so that whether liquid returns inside the compressor 3 or not can be judged according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil pipe temperature value, and whether the refrigeration oil inside the compressor 3 is diluted or not can be judged; and the compressor 3 is controlled to enter a low-pressure protection state or a normal operation state, so that the problem that the service life of the compressor 3 is reduced due to frequent starting, stopping or fluctuation of the compressor 3 in the prior art can be solved.
Of course, in other embodiments of the present application, the steps from step S12 to step S18 may be eliminated.
As described above, the low-pressure protection control method provided in the embodiment of the present application can determine whether the liquid returns inside the compressor 3 according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value, and the coil temperature value, and can determine whether the refrigeration oil inside the compressor 3 is diluted when the air conditioner 1 operates the low-pressure protection control method. Therefore, the running parameters of the compressor 3 are adjusted together through the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil pipe temperature value, so that the influence of frequent frequency reduction or frequent start-stop of the compressor 3 on the service life of the compressor 3 can be prevented, and the overall reliability of the air conditioner 1 can be prevented from being reduced. Therefore, the problem that the service life of the compressor 3 is reduced due to frequent start-stop or fluctuation of the compressor 3 is solved.
Referring to fig. 7, in order to execute possible steps of the low-voltage protection control method provided in each of the above embodiments, fig. 7 shows a functional module schematic diagram of a low-voltage protection control device provided in an embodiment of the present application. The low-voltage protection control device is applied to the air conditioner 1, and the low-voltage protection control device provided by the embodiment of the application is used for executing the low-voltage protection control method. It should be noted that the basic principle and the generated technical effects of the low voltage protection control device provided in the present embodiment are substantially the same as those of the above embodiments, and for the sake of brief description, no part of the present embodiment is mentioned, and reference may be made to the corresponding contents in the above embodiments.
The low voltage protection device includes a receiving module 10 and a control module 20.
The receiving module 10 is configured to receive a return air temperature value, an evaporator outlet temperature value, an oil temperature value, and a coil temperature value. The return air temperature value represents the temperature of a refrigerant in a return air pipe of a compressor 3 of the air conditioner 1, the evaporator outlet temperature value represents the temperature of the refrigerant at the outlet of an evaporator in an indoor unit of the air conditioner 1, the oil temperature value represents the oil temperature at the bottom of the compressor 3, and the coil temperature value represents the temperature of the evaporator.
Alternatively, the receiving module 10 may be configured to execute step S10 in the above-mentioned respective figures to achieve the corresponding technical effect.
In addition, the receiving module 10 may be further configured to obtain an operation time value, which represents an operation time after the compressor 3 is started.
Optionally, the receiving module 10 may also be configured to execute step S12 in the above-mentioned respective figures to achieve the corresponding technical effect.
The control module 20 is configured to issue a low-pressure protection command or a normal operation command according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil temperature value, wherein the low-pressure protection command is configured to control the compressor 3 of the air conditioner 1 to be frequency-reduced or shut down, and the normal operation command is configured to control the compressor 3 to normally operate.
Alternatively, the control module 20 may be configured to perform step S20 and its sub-steps in the various figures described above to achieve corresponding technical effects.
In addition, the control module 20 is further configured to determine whether the operation mode of the air conditioner 1 is a heating mode.
Alternatively, the control module 20 may be configured to perform step S02 in the various figures described above to achieve a corresponding technical effect.
In addition, the control module 20 is further configured to determine whether the operation time value is less than or equal to the preset time value, in other words, the control module 20 is further configured to execute step S14 in the above-mentioned figures to achieve the corresponding technical effect.
Also, the control module 20 is configured to perform step S20 if the operation time value is less than or equal to the preset time value, and is configured to issue a normal operation command if the operation time value is greater than the preset time value. In other words, the control module 20 may be configured to perform steps S16 and S18 in the various figures described above to achieve corresponding technical effects.
To sum up, the low-voltage protection control method and device and the air conditioner 1 provided in the embodiment of the present application can determine whether the interior of the compressor 3 returns liquid or not according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil pipe temperature value, and can determine whether the refrigeration oil in the compressor 3 is diluted or not. Therefore, the running parameters of the compressor 3 are adjusted together through the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil pipe temperature value, so that the influence of frequent frequency reduction or frequent start-stop of the compressor 3 on the service life of the compressor 3 can be prevented, and the overall reliability of the air conditioner 1 can be prevented from being reduced. Therefore, the problem that the service life of the compressor 3 is reduced due to frequent start-stop or fluctuation of the compressor 3 is solved. And, the step of judging whether the compressor 3 returns liquid or not according to the return air superheat degree of the compressor 3 is placed before the step of judging whether the refrigeration oil of the compressor 3 is diluted or not according to the oil temperature superheat degree of the compressor 3, the compressor 3 can be directly controlled to normally operate under the condition that the liquid return state of the compressor 3 does not occur, the execution frequency of starting and stopping or reducing the frequency of the compressor 3 can be reduced, and therefore the problem that the service life of the compressor 3 is reduced due to frequent starting and stopping or fluctuation of the compressor 3 is solved. In addition, whether low-pressure protection control needs to be carried out on the compressor 3 can be judged according to the running time value of the compressor 3, so that the problem that the service life of the compressor 3 is shortened due to frequent starting and stopping or fluctuation of the compressor 3 in the prior art is solved.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A low-voltage protection control method is applied to an air conditioner and is characterized by comprising the following steps:
receiving a return air temperature value, an evaporator outlet temperature value, an oil temperature value and a coil pipe temperature value; the return air temperature value represents the temperature of a refrigerant in a return air pipe of a compressor of the air conditioner, the evaporator outlet temperature value represents the temperature of the refrigerant at the outlet of an evaporator in an indoor unit of the air conditioner, the oil temperature value represents the oil temperature at the bottom of the compressor, and the coil pipe temperature value represents the temperature of the evaporator;
and sending a low-pressure protection instruction or a normal operation instruction according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil temperature value, wherein the low-pressure protection instruction is configured to control a compressor of the air conditioner to be frequency-reduced or shut down, and the normal operation instruction is configured to control the compressor to normally operate.
2. The undervoltage protection control method of claim 1, wherein the step of issuing an undervoltage protection command or a normal operation command based on the return air temperature value, the evaporator outlet temperature value, the oil temperature value, and the coil temperature value comprises:
judging whether the return air temperature value and the evaporator outlet temperature value meet a first preset condition or not;
if the return air temperature value and the evaporator outlet temperature value meet the first preset condition, judging whether the oil temperature value and the coil temperature value meet a second preset condition or not;
if the oil temperature value and the coil temperature value meet the second preset condition, a low-pressure protection instruction is sent out to control the compressor to reduce the frequency or stop the compressor;
if the return air temperature value and the evaporator outlet temperature value do not meet the first preset condition, or if the oil temperature value and the coil temperature value do not meet the second preset condition, a normal operation instruction is sent out to control the compressor to normally operate.
3. The low pressure protection control method according to claim 2, wherein the step of determining whether the return air temperature value and the evaporator outlet temperature value satisfy a first preset condition comprises:
calculating a return air superheat value according to the return air temperature value and the evaporator outlet temperature value, wherein the return air superheat value represents a return air superheat degree of an outdoor unit of the air conditioner;
judging whether the return air superheat value is smaller than or equal to a preset return air superheat value or not;
and if the return air superheat value is smaller than or equal to the preset return air superheat value, the return air temperature value and the evaporator outlet temperature value meet the first preset condition.
4. The low pressure protection control method of claim 3, wherein the step of calculating a return air superheat value from the return air temperature value and the evaporator outlet temperature value comprises:
and calculating the return air temperature value minus the evaporator outlet temperature value to obtain the return air superheat value.
5. The low pressure protection control method of claim 2, wherein the step of determining whether the oil temperature value and the coil temperature value satisfy a second preset condition comprises:
calculating an oil temperature superheat value according to the oil temperature value and the coil temperature value, wherein the oil temperature superheat value represents an oil temperature superheat degree of an outdoor unit of the air conditioner;
judging whether the oil temperature overheating value is smaller than or equal to a preset oil temperature overheating value;
and if the oil temperature overheating value is smaller than or equal to the preset oil temperature overheating value, the oil temperature value and the coil temperature value meet the second preset condition.
6. The undervoltage protection control method of claim 5, wherein calculating an oil temperature superheat value from the oil temperature value and the coil temperature value comprises:
and calculating the oil temperature value minus the coil temperature value to obtain the oil temperature overheating value.
7. The under-pressure protection control method according to claim 1, wherein before the step of issuing an under-pressure protection command or a normal operation command in accordance with the return air temperature value, the evaporator outlet temperature value, the oil temperature value, and the coil temperature value, the under-pressure protection control method further comprises:
obtaining a run time value, wherein the run time value represents a run time after the compressor is started;
judging whether the running time value is less than or equal to a preset time value or not;
if the running time value is less than or equal to the preset time value, a low-pressure protection instruction or a normal running instruction is sent out according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil temperature value;
and if the running time value is greater than the preset time value, sending the normal running instruction to control the compressor to run normally.
8. The under-pressure protection control method according to claim 1, wherein prior to the step of receiving a return air temperature value, an evaporator outlet temperature value, an oil temperature value, and a coil temperature value, the under-pressure protection control method further comprises:
judging whether the operation mode of the air conditioner is a heating mode or not;
and if so, executing the step of receiving the return air temperature value, the evaporator outlet temperature value, the oil temperature value and the coil temperature value.
9. A low-voltage protection control device is applied to an air conditioner and is characterized by comprising:
a receiving module configured to receive a return air temperature value, an evaporator outlet temperature value, an oil temperature value, and a coil temperature value; the return air temperature value represents the temperature of a refrigerant in a return air pipe of a compressor of the air conditioner, the evaporator outlet temperature value represents the temperature of the refrigerant at the outlet of an evaporator in an indoor unit of the air conditioner, the oil temperature value represents the oil temperature at the bottom of the compressor, and the coil pipe temperature value represents the temperature of the evaporator;
a control module configured to issue a low-pressure protection instruction or a normal operation instruction according to the return air temperature value, the evaporator outlet temperature value, the oil temperature value, and the coil temperature value, wherein the low-pressure protection instruction is configured to control a compressor of the air conditioner to be frequency-reduced or shut down, and the normal operation instruction is configured to control the compressor to normally operate.
10. An air conditioner characterized by comprising a controller configured to execute the low voltage protection control method according to any one of claims 1 to 8.
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Application publication date: 20210622 |