CN111664556A - Oil temperature heating belt control method and device of heat pump air conditioner and heat pump air conditioner - Google Patents
Oil temperature heating belt control method and device of heat pump air conditioner and heat pump air conditioner Download PDFInfo
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- CN111664556A CN111664556A CN202010376329.3A CN202010376329A CN111664556A CN 111664556 A CN111664556 A CN 111664556A CN 202010376329 A CN202010376329 A CN 202010376329A CN 111664556 A CN111664556 A CN 111664556A
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/873—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling refrigerant heaters
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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 relates to a method and a device for controlling an oil temperature heating belt of a heat pump air conditioner and the heat pump air conditioner. Compared with the prior art, the liquid refrigerant is indicated to be sucked into the compressor by the first heating condition, the oil temperature heating belt is intelligently controlled to be electrified according to the exhaust temperature of the compressor and the running temperature of the indoor unit, the liquid refrigerant accumulated at the bottom of the compressor is evaporated, and the compressor is prevented from being damaged due to a liquid compression phenomenon.
Description
Technical Field
The invention relates to the field of oil temperature heating zone control, in particular to a method and a device for controlling an oil temperature heating zone of a heat pump air conditioner and the heat pump air conditioner.
Background
The heat pump air conditioner is a device for transferring heat energy of a low-level heat source to a high-level heat source, and comprises a compressor, an indoor unit, an outdoor unit, a throttling device and a reversing valve.
When the heat pump air conditioner operates in a refrigeration mode, high-temperature and high-pressure gaseous refrigerant discharged by the compressor enters the outdoor unit heat exchanger through the reversing valve, the high-temperature and high-pressure gaseous refrigerant is condensed into liquid, enters the indoor unit heat exchanger through the throttling device, absorbs heat in the indoor unit heat exchanger to cool indoor cooling medium, and the evaporated low-temperature and low-pressure gaseous refrigerant is sucked by the compressor after passing through the reversing valve, so that refrigeration cycle is realized.
When the heat pump operates in a heating mode, the reversing valve is firstly turned, high-temperature and high-pressure gaseous refrigerant discharged by the compressor flows into the indoor unit heat exchanger through the reversing valve, latent heat discharged when the gaseous refrigerant is condensed heats indoor cooling medium, the condensed liquid refrigerant reversely flows through the throttling device, enters the outdoor unit heat exchanger and absorbs external heat to be evaporated, and the evaporated low-temperature and low-pressure gaseous refrigerant is sucked by the compressor after passing through the reversing valve, so that heating circulation is realized.
When the heat pump operates, liquid refrigerant may enter the compressor along with the refrigeration cycle or heating cycle of the heat pump air conditioner, so that the refrigerant in the compressor is liquefied and accumulated, and the service life of the compressor is influenced.
Disclosure of Invention
The embodiment of the application provides a method and a device for controlling an oil temperature heating zone of a heat pump air conditioner and the heat pump air conditioner, and the method and the device can control the oil temperature heating zone to heat compressor lubricating oil of the heat pump air conditioner after detecting that liquid refrigerant is sucked into a compressor, so that the phenomenon that the refrigerant in the compressor is liquefied and accumulated and influences the service life of the compressor is avoided. The technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a method and a device for controlling an oil temperature heating zone of a heat pump air conditioner, including the following steps:
when the heat pump air conditioner is in a heating mode, acquiring the exhaust temperature of a compressor and the operating temperature of an indoor unit;
determining whether a first heating condition is satisfied according to a difference between a discharge temperature of the compressor and an operating temperature of the indoor unit; wherein the first heating condition is used for indicating heating of lubricating oil at the bottom of the compressor;
and when the first heating condition is met, controlling the oil temperature heating belt to be electrified.
Optionally, the determining, by the difference between the discharge temperature of the compressor and the operating temperature of the indoor unit, whether the first heating condition is satisfied includes:
judging whether the difference value between the exhaust temperature of the compressor and the water inlet temperature is smaller than a first threshold value, and if so, determining that the first heating condition is met;
or judging whether the difference value between the exhaust temperature of the compressor and the temperature of a coil of the heat exchanger of the indoor unit is smaller than a second threshold value, and if so, determining that the first heating condition is met.
Optionally, the method further comprises the following steps:
when the heat pump air conditioner is in a refrigeration mode, acquiring the exhaust temperature of a compressor and the operating temperature of an outdoor unit;
determining whether a second heating condition is satisfied according to a difference between a discharge temperature of the compressor and an operating temperature of an outdoor unit; wherein the second heating condition is used for indicating heating of the lubricating oil at the bottom of the compressor;
and when the second heating condition is met, controlling the oil temperature heating belt to be electrified.
Optionally, the determining whether the second heating condition is satisfied according to the discharge temperature of the compressor and the operating temperature of the outdoor unit includes:
judging whether the difference between the discharge temperature of the compressor and the outdoor environment temperature is smaller than a third threshold value, and if so, determining that the second heating condition is met;
or judging whether the difference value between the discharge temperature of the compressor and the temperature of the coil of the outdoor unit heat exchanger is smaller than a fourth threshold value, and if so, determining that the second heating condition is met.
Optionally, before determining whether the first heating condition is satisfied according to a difference between the discharge temperature of the compressor and the operating temperature of the indoor unit, the method further includes:
detecting whether the running time of the heat pump air conditioner in a heating mode reaches a set threshold value or not, or detecting whether the heat pump air conditioner is in a standby state of the heating mode or not;
before determining whether the second heating condition is satisfied according to the difference between the discharge temperature of the compressor and the operation temperature of the outdoor unit, the method further includes:
detecting whether the running time of the heat pump air conditioner in the refrigeration mode reaches a set threshold value or not, or detecting whether the heat pump air conditioner is in the standby state of the refrigeration mode or not.
Optionally, when the first heating condition is satisfied, controlling the oil temperature heating belt to be electrified further includes:
when the difference value between the exhaust temperature of the compressor and the water inlet temperature is larger than or equal to a fifth threshold value, controlling the oil temperature heating belt to be powered off, wherein the fifth threshold value is larger than the first threshold value;
or when the difference value between the exhaust temperature of the compressor and the temperature of a coil of the indoor unit heat exchanger is larger than or equal to a sixth threshold value, controlling the oil temperature heating zone to be powered off, wherein the sixth threshold value is larger than the second threshold value.
Optionally, when the second heating condition is satisfied, after the oil temperature heating belt is controlled to be electrified, the method further includes:
when the difference value between the discharge temperature of the compressor and the outdoor environment temperature is larger than or equal to a seventh threshold value, controlling the oil temperature heating belt to be powered off, wherein the seventh threshold value is larger than the third threshold value;
or when the difference value between the discharge temperature of the compressor and the temperature of a coil of the outdoor unit heat exchanger is greater than or equal to an eighth threshold value, controlling the oil temperature heating belt to be powered off, wherein the eighth threshold value is greater than the fourth threshold value.
Optionally, the method further comprises the following steps:
when the heat pump air conditioner is electrified for the first time, controlling the oil temperature heating belt to be electrified and acquiring the exhaust temperature of the compressor;
and when the exhaust temperature of the compressor is greater than or equal to a ninth threshold value, controlling the oil temperature heating belt to be powered off.
In a second aspect, an embodiment of the present application provides an oil temperature heating zone control device of a heat pump air conditioner, including:
the first temperature acquisition module is used for acquiring the exhaust temperature of the compressor and the running temperature of the indoor unit when the heat pump air conditioner is in a heating mode;
the first heating condition determining module is used for determining whether a first heating condition is met according to a difference value between the exhaust temperature of the compressor and the running temperature of the indoor unit; wherein the first heating condition is used for indicating heating of lubricating oil at the bottom of the compressor;
and the first heating module is used for controlling the oil temperature heating belt to be electrified when the first heating condition is met.
In a third aspect, an embodiment of the present application provides a heat pump air conditioner, including: the air conditioner comprises a controller, a compressor, an indoor unit and an outdoor unit, wherein an oil temperature heating belt is arranged at the bottom of the compressor, and the controller comprises a memory and a processor;
the memory for storing one or more programs;
when the one or more programs are executed by the processor, the processor is enabled to realize the control method for the oil temperature heating zone of the heat pump air conditioner.
In this application embodiment, through the exhaust temperature who detects the compressor and the operating temperature of indoor set to confirm whether satisfy first heating condition according to the difference between the exhaust temperature of compressor and the operating temperature of indoor set, first heating condition indicates that liquid refrigerant is inhaled the compressor, and it is right to need the lubricating oil of compressor bottom heats, when satisfying first heating condition, takes the circular telegram through control oil temperature heating, evaporates the liquid refrigerant of compressor bottom overstock, avoids the compressor to cause the damage because of liquid compression phenomenon.
For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a flowchart of a method for controlling an oil temperature heating zone of a heat pump air conditioner according to an exemplary embodiment of the present invention;
fig. 2 is a flowchart of a method for controlling an oil temperature heating zone of a heat pump air conditioner according to another exemplary embodiment of the present invention;
fig. 3 is a schematic structural diagram of an oil temperature heating zone control device of a heat pump air conditioner according to an exemplary embodiment of the present invention;
fig. 4 is a schematic structural diagram of an oil temperature heating zone control device of a heat pump air conditioner according to another exemplary embodiment of the invention;
fig. 5 is a schematic structural diagram of a heat pump air conditioner according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
It should be understood that the embodiments described are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims. In the description of the present application, it is to be understood that the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In the operation process of the heat pump air conditioner, the reason for the liquid compression phenomenon is that the liquid refrigerant is sucked into the compressor due to too much liquid refrigerant entering the evaporator or too low evaporation pressure of the evaporator, and the liquid refrigerant is accumulated at the bottom of the compressor.
In view of the above technical problem, an embodiment of the present invention provides a method for controlling an oil temperature heating zone of a heat pump air conditioner, as shown in fig. 1, in one embodiment, the method includes the following steps:
step S1: when the heat pump air conditioner is in a heating mode, acquiring the exhaust temperature of a compressor and the operating temperature of an indoor unit;
when the heat pump air conditioner is in a heating cycle, the indoor unit heat exchanger serves as a condenser and is used for exchanging heat with circulating water to heat the circulating water, a heating effect is achieved, liquid refrigerants in the condenser migrate to the evaporator along with the heating cycle and are finally sucked into the compressor, if the temperature of the compressor is low at the moment, the liquid refrigerants are difficult to evaporate, liquid compression is caused by pressure accumulation at the bottom of the compressor, and the performance of the compressor is affected.
The discharge temperature of the compressor is indicative of the temperature of the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port of the compressor, and can be detected by a temperature probe, such as a thermocouple, arranged at the discharge port of the compressor.
The operation temperature of the indoor unit refers to the working temperature of heat exchange between the gaseous refrigerant of the indoor unit and a cooling medium, the cooling medium can be circulating water or air, and the operation temperature of the indoor unit can be the water inlet temperature or the coil temperature of a heat exchanger of the indoor unit.
Step S2: determining whether a first heating condition is satisfied according to a difference between a discharge temperature of the compressor and an operating temperature of the indoor unit; wherein the first heating condition is used for indicating heating of lubricating oil at the bottom of the compressor.
The first heating condition is used for indicating that the compressor has a liquid compression phenomenon, and in the operation process of the heating mode of the heat pump air conditioner, if the exhaust temperature of the compressor is lower than the operation temperature of the indoor unit, namely the difference value between the exhaust temperature of the compressor and the operation temperature of the indoor unit is smaller than a certain threshold value, the liquid refrigerant is indicated to be possibly sucked into the compressor, so that the compressor has the liquid compression phenomenon. Therefore, in the embodiment of the present application, when the heat pump air conditioner is in the heating mode, whether the liquid compression phenomenon occurs in the compressor is determined according to the difference between the discharge temperature of the compressor and the operating temperature of the indoor unit.
Step S3: and when the first heating condition is met, controlling the oil temperature heating belt to be electrified.
The oil temperature heating zone is arranged at the bottom of the compressor and used for heating lubricating oil at the bottom of the compressor and evaporating liquid refrigerants accumulated at the bottom of the compressor.
In this application embodiment, through the exhaust temperature who detects the compressor and the operating temperature of indoor set to confirm whether satisfy first heating condition according to the difference between the exhaust temperature of compressor and the operating temperature of indoor set, first heating condition indicates that liquid refrigerant is inhaled the compressor, and it is right to need the lubricating oil of compressor bottom heats, when satisfying first heating condition, takes the circular telegram through control oil temperature heating, evaporates the liquid refrigerant of compressor bottom overstock, avoids the compressor to cause the damage because of liquid compression phenomenon.
In an exemplary embodiment, the cooling medium is circulating water, the operating temperature of the indoor unit includes a water inlet temperature or a coil temperature of an indoor unit heat exchanger, and the determining whether the first heating condition is satisfied according to a difference between a discharge temperature of the compressor and the operating temperature of the indoor unit includes:
judging whether the difference value between the exhaust temperature of the compressor and the water inlet temperature is smaller than a first threshold value, and if so, determining that the first heating condition is met;
alternatively, the first and second electrodes may be,
and judging whether the difference value between the exhaust temperature of the compressor and the temperature of a coil of the heat exchanger of the indoor unit is smaller than a second threshold value, and if so, determining that the first heating condition is met.
Wherein, the temperature of intaking is the temperature of intaking of circulating water, the coil pipe temperature of indoor set heat exchanger is for carrying out the condenser coil pipe temperature behind the heat exchange, the temperature of intaking is greater than the coil pipe temperature of indoor set heat exchanger works as when the operating temperature of indoor set is the temperature of intaking, triggers more easily first heating condition, thereby control the oil temperature heating tape is right the compressor heats.
In one example, the first threshold and the second threshold may be 5 degrees. In other examples, the first threshold and the second threshold may be adjusted according to actual conditions.
When the difference between the exhaust temperature of the compressor and the inlet water temperature is smaller than a first threshold value, or when the difference between the exhaust temperature of the compressor and the coil pipe temperature of the heat exchanger of the indoor unit is smaller than a second threshold value, the exhaust temperature of the compressor is smaller than the operating temperature of the indoor unit, liquid refrigerant of the indoor unit is sucked by the compressor through heating circulation, and the liquid refrigerant is accumulated at the bottom of the compressor due to the fact that the internal temperature of the compressor is low. Therefore, the oil temperature heating belt needs to be controlled to be electrified, so that the liquid refrigerant accumulated at the bottom of the compressor is evaporated, and the compressor is prevented from being damaged due to hydraulic compression.
As shown in fig. 2, in an exemplary embodiment, the method for controlling an oil temperature heating zone of a heat pump air conditioner according to the embodiment of the present application further includes the following steps:
step S4: when the heat pump air conditioner is in a refrigeration mode, acquiring the exhaust temperature of a compressor and the operating temperature of an outdoor unit;
in the refrigeration cycle of the heat pump air conditioner, an indoor machine heat exchanger serves as an evaporator, a liquid refrigerant absorbs heat and evaporates to achieve a refrigeration effect, an outdoor machine heat exchanger serves as a condenser, the liquid refrigerant in the condenser migrates to the evaporator along with the refrigeration cycle and is finally sucked into a compressor, if the temperature of the compressor is low at the moment, the liquid refrigerant is difficult to evaporate, and the bottom of the compressor is overstocked to cause a liquid compression phenomenon, so that the performance of the compressor is influenced.
The operation temperature of the outdoor unit may refer to a working temperature at which a gaseous refrigerant of the outdoor unit exchanges heat with a cooling medium, the cooling medium may be circulating water or air, and the operation temperature of the outdoor unit may be a water inlet temperature, a coil temperature of a heat exchanger of the outdoor unit, or an outdoor environment temperature.
Step S5: determining whether a second heating condition is satisfied according to a difference between a discharge temperature of the compressor and an operating temperature of an outdoor unit; wherein the second heating condition is used for indicating heating of the lubricating oil at the bottom of the compressor;
the second heating condition is used for indicating that the compressor has a liquid compression phenomenon, and in the operation process of the heat pump air conditioner in the refrigeration mode, if the discharge temperature of the compressor is lower than the operation temperature of the outdoor unit, namely the difference value between the discharge temperature of the compressor and the operation temperature of the outdoor unit is smaller than a certain threshold value, the heat pump air conditioner indicates that the liquid refrigerant is possibly sucked into the compressor, so that the compressor has the liquid compression phenomenon. Therefore, in the embodiment of the present application, when the heat pump air conditioner is in the cooling mode, whether the liquid compression phenomenon occurs in the compressor is determined according to the difference between the discharge temperature of the compressor and the operation temperature of the outdoor unit.
Step S6: and when the second heating condition is met, controlling the oil temperature heating belt to be electrified.
In the embodiment of the application, whether a second heating condition is met is determined according to the detected exhaust temperature of the compressor and the operation temperature of the outdoor unit and according to the difference value between the exhaust temperature of the compressor and the operation temperature of the outdoor unit, the second heating condition indicates that a liquid refrigerant is sucked into the compressor and needs to be heated, the liquid refrigerant accumulated at the bottom of the compressor is evaporated by controlling the oil temperature heating belt to be electrified, and the compressor is prevented from being damaged due to hydraulic compression.
In an exemplary embodiment, the determining whether the second heating condition is satisfied according to a difference between a discharge temperature of the compressor and an operating temperature of the outdoor unit includes:
judging whether the difference between the discharge temperature of the compressor and the outdoor environment temperature is smaller than a third threshold value, and if so, determining that the second heating condition is met;
alternatively, the first and second electrodes may be,
and judging whether the difference value between the exhaust temperature of the compressor and the temperature of a coil of the heat exchanger of the outdoor unit is smaller than a fourth threshold value, and if so, determining that the second heating condition is met.
The outdoor unit comprises an outdoor unit heat exchanger, a water inlet pipe, a water outlet pipe, a water inlet pipe, a water outlet pipe and a water outlet pipe, wherein the water inlet temperature is the circulating water temperature.
In one example, the third and fourth thresholds may be 5 degrees. In other examples, the third threshold and the fourth threshold may be set according to actual requirements.
When the difference between the discharge temperature of the compressor and the inlet water temperature is smaller than a third threshold value, or when the difference between the discharge temperature of the compressor and the coil temperature of the heat exchanger of the outdoor unit is smaller than a fourth threshold value, the discharge temperature of the compressor is lower than the operating temperature of the outdoor unit, the liquid refrigerant of the outdoor unit is sucked by the compressor through the refrigeration cycle, and the liquid refrigerant is accumulated at the bottom of the compressor due to the lower internal temperature of the compressor. Therefore, the oil temperature heating belt needs to be controlled to be electrified, so that the liquid refrigerant accumulated at the bottom of the compressor is evaporated, and the compressor is prevented from being damaged due to hydraulic compression.
In an exemplary embodiment, before determining whether the first heating condition is satisfied according to a difference between a discharge temperature of the compressor and an operating temperature of the indoor unit, the method further includes:
detecting whether the running time of the heat pump air conditioner in a heating mode reaches a set threshold value or not, or detecting whether the heat pump air conditioner is in a standby state of the heating mode or not;
before determining whether the second heating condition is satisfied according to the difference between the discharge temperature of the compressor and the operation temperature of the outdoor unit, the method further includes:
detecting whether the running time of the heat pump air conditioner in the refrigeration mode reaches a set threshold value or not, or detecting whether the heat pump air conditioner is in the standby state of the refrigeration mode or not.
When the heat pump air conditioner is a fixed frequency air conditioner, when the indoor temperature reaches a set value in the running process is detected, a stop signal is sent to the compressor to stop the compressor, the heat pump air conditioner is in a standby state at the moment, for the heat pump air conditioner in the standby state, because the interior of the compressor still performs heating circulation or refrigerating circulation within a period of time after the compressor is stopped, liquid refrigerant in the condenser can migrate to the evaporator and is finally sucked into the compressor, and the pressure is accumulated at the bottom of the compressor to cause a liquid compression phenomenon, so that the performance of the compressor is influenced, and therefore, when the heat pump air conditioner is detected to be in the standby state, whether the liquid refrigerant is sucked into the compressor needs to be judged.
Specifically, in one embodiment, when the heat pump air conditioner is in a standby state of a heating mode, whether the difference between the exhaust temperature of the compressor and the water inlet temperature is less than 5 degrees is judged, if yes, an oil temperature heating zone is put in, and when the difference between the exhaust temperature of the compressor and the water inlet temperature is greater than or equal to 15 degrees, the oil temperature heating zone is controlled to be powered off.
When the heat pump air conditioner is in a standby state of a refrigeration mode, judging whether the difference value between the exhaust temperature of the compressor and the coil temperature of the outdoor unit heat exchanger is less than 5 degrees, if so, inputting an oil temperature heating zone, and when the difference value between the exhaust temperature of the compressor and the coil temperature of the outdoor unit heat exchanger is more than or equal to 15 degrees, controlling the oil temperature heating zone to be powered off.
For the heat pump air conditioner which operates for a period of time, the situation that the liquid refrigerant is accumulated at the bottom of the compressor is more likely to occur, and the judgment of the first heating condition or the second heating condition is carried out at the moment, so that unnecessary investment of an oil temperature heating belt can be avoided, and electric energy is saved.
Specifically, in one embodiment, after the heat pump air conditioner is in a heating mode and operates for 2 minutes, whether the difference between the exhaust temperature of the compressor and the coil temperature of the indoor unit heat exchanger is smaller than 5 degrees is judged, if yes, an oil temperature heating zone is input, and when the difference between the exhaust temperature of the compressor and the coil temperature of the indoor unit heat exchanger is larger than or equal to 15 degrees, the oil temperature heating zone is controlled to be powered off.
And when the heat pump air conditioner is in a refrigeration mode and runs for 2 minutes, judging whether the difference value between the exhaust temperature of the compressor and the coil temperature of the outdoor unit heat exchanger is less than 5 ℃, if so, inputting an oil temperature heating zone, and when the difference value between the exhaust temperature of the compressor and the coil temperature of the outdoor unit heat exchanger is more than or equal to 15 ℃, controlling the oil temperature heating zone to be powered off.
In other examples, the set threshold of the operation time may also be set according to actual requirements.
In one exemplary embodiment, controlling the oil temperature heating belt to be electrified when the first heating condition is satisfied further includes:
when the difference value between the exhaust temperature of the compressor and the water inlet temperature is larger than or equal to a fifth threshold value, controlling the oil temperature heating belt to be powered off, wherein the fifth threshold value is larger than the first threshold value;
alternatively, the first and second electrodes may be,
and when the difference value between the exhaust temperature of the compressor and the temperature of a coil of the indoor unit heat exchanger is larger than or equal to a sixth threshold value, controlling the oil temperature heating belt to be powered off, wherein the sixth threshold value is larger than the second threshold value.
In one example, the fifth and sixth thresholds may be 15 degrees. In other examples, the fifth threshold and the sixth threshold may be set according to actual requirements.
Preferably, because the inlet water temperature is higher than the coil temperature of the heat exchanger of the indoor unit, when the oil temperature heating belt is controlled to be electrified until the difference between the exhaust temperature and the inlet water temperature of the compressor is greater than or equal to a fifth threshold value, the exhaust temperature of the compressor is higher, and the liquid refrigerant in the compressor can be completely evaporated.
When the difference between the exhaust temperature of the compressor and the inlet water temperature is larger than or equal to a fifth threshold value, or when the difference between the exhaust temperature of the compressor and the coil pipe temperature of the heat exchanger of the indoor unit is larger than or equal to a sixth threshold value, the exhaust temperature of the compressor is larger than the running temperature of the indoor unit, and liquid refrigerant overstock at the bottom of the compressor cannot occur. Therefore, the oil temperature heating belt does not need to be controlled to be electrified, so that electric energy is saved, and meanwhile, the oil temperature heating belt is prevented from being easily aged due to long-term electrification.
In an exemplary embodiment, after controlling the oil temperature heating belt to be electrified when the second heating condition is satisfied, the method further includes:
when the difference value between the discharge temperature of the compressor and the outdoor environment temperature is larger than or equal to a seventh threshold value, controlling the oil temperature heating belt to be powered off, wherein the seventh threshold value is larger than the third threshold value;
alternatively, the first and second electrodes may be,
and when the difference value between the discharge temperature of the compressor and the temperature of a coil of the outdoor unit heat exchanger is greater than or equal to an eighth threshold value, controlling the oil temperature heating belt to be powered off, wherein the eighth threshold value is greater than the fourth threshold value.
In one example, the seventh threshold and the eighth threshold may be 15 degrees. In other examples, the seventh threshold and the eighth threshold may also be set according to actual requirements.
Preferably, because the inlet water temperature is higher than the coil temperature of the heat exchanger of the indoor unit, when the oil temperature heating belt is controlled to be electrified until the difference between the exhaust temperature and the inlet water temperature of the compressor is greater than or equal to a seventh threshold value, the exhaust temperature of the compressor is higher, and the liquid refrigerant in the compressor can be completely evaporated.
When the difference between the discharge temperature of the compressor and the inlet water temperature is larger than or equal to a seventh threshold value, or when the difference between the discharge temperature of the compressor and the coil temperature of the outdoor unit heat exchanger is larger than or equal to an eighth threshold value, the discharge temperature of the compressor is larger than the running temperature of the outdoor unit, and liquid refrigerant overstock does not occur at the bottom of the compressor. Therefore, the oil temperature heating belt does not need to be controlled to be electrified, so that electric energy is saved, and meanwhile, the oil temperature heating belt is prevented from being easily aged due to long-term electrification.
In an exemplary embodiment, when the heat pump air conditioner is powered on for the first time, in order to avoid a situation that a liquid refrigerant is sucked into the compressor after the compressor stops operating and a large amount of liquid refrigerant is sucked into the compressor as soon as the compressor is started to cause liquid compression, the oil temperature heating zone control method of the heat pump air conditioner according to the embodiment of the present application further includes the following steps:
when the heat pump air conditioner is electrified for the first time, controlling the oil temperature heating belt to be electrified and acquiring the exhaust temperature of the compressor;
and when the exhaust temperature of the compressor is greater than or equal to a ninth threshold value, controlling the oil temperature heating belt to be powered off.
When the heat pump air conditioner heats in winter, the surface temperature of the evaporator can reach below zero, the surface of the evaporator can frost, the thick frost layer can cause air flow obstruction, and the heating capacity of the heat pump air conditioner is affected, therefore, the heat pump air conditioner is also provided with a defrosting mode for solving the problem, and in an exemplary embodiment, the method comprises the following steps:
and when the heat pump air conditioner is in a defrosting mode, controlling the oil temperature heating belt to be electrified.
Since the defrosting mode is mostly applied to a case where the outdoor ambient temperature is low, in which case the operating temperature of the compressor is less affected by the ambient temperature, and the duration of the defrosting mode is generally short, in the embodiment of the present application, for the heat pump air conditioner in the defrosting mode, the oil temperature heating belt is powered on until the defrosting mode is finished, and at this time, the heat pump air conditioner stops or enters the next stage.
In an exemplary embodiment, in order to avoid that a refrigeration or heating cycle still exists in the heat pump air conditioner after shutdown, and the temperature of the compressor is reduced due to premature shutdown, so that a liquid refrigerant is sucked into the compressor and is accumulated at the bottom of the compressor, the method for controlling the oil temperature heating zone of the heat pump air conditioner according to the embodiment of the present application further includes the following steps:
when the heat pump air conditioner is in a shutdown state, obtaining the shutdown time of the heat pump;
the method for controlling the oil temperature heating zone of the heat pump air conditioner according to any one of the preceding claims, if the shutdown time is less than a set duration, controlling the oil temperature heating zone to be energized.
Otherwise, controlling the oil temperature heating belt to be powered off.
The set time duration of the shutdown time may be set according to an actual requirement, and in an example, the set time duration of the shutdown time may be set to 96 hours.
Referring to fig. 3, an embodiment of the present application further provides an oil temperature heating zone control device of a heat pump air conditioner, including:
the first temperature acquisition module 1 is used for acquiring the exhaust temperature of a compressor and the operating temperature of an indoor unit when the heat pump air conditioner is in a heating mode;
a first heating condition determining module 2 for determining whether a first heating condition is satisfied according to a difference between a discharge temperature of the compressor and an operating temperature of the indoor unit; wherein the first heating condition is used for indicating heating of lubricating oil at the bottom of the compressor;
and the first heating module 3 is used for controlling the oil temperature heating belt to be electrified when the first heating condition is met.
In an exemplary embodiment, the operation temperature of the indoor unit includes a water inlet temperature or a coil temperature of an indoor unit heat exchanger, and the first heating condition determining module 2 includes:
a first judgment unit for judging whether a difference between a discharge temperature of the compressor and the intake water temperature is less than a first threshold, and if so, determining that the first heating condition is satisfied;
and the second judgment unit is used for judging whether the difference value between the exhaust temperature of the compressor and the temperature of a coil of the heat exchanger of the indoor unit is smaller than a second threshold value or not, and if so, determining that the first heating condition is met.
Referring to fig. 4, in an exemplary embodiment, the oil temperature heating zone control device of the heat pump air conditioner further includes:
the second temperature obtaining module 4 is used for obtaining the exhaust temperature of the compressor and the running temperature of the outdoor unit when the heat pump air conditioner is in a refrigeration mode;
a second heating condition determining module 5 for determining whether a second heating condition is satisfied according to a difference between a discharge temperature of the compressor and an operation temperature of the outdoor unit; wherein the second heating condition is used for indicating heating of the lubricating oil at the bottom of the compressor;
and the second heating module 6 is used for controlling the oil temperature heating belt to be electrified when the second heating condition is met.
In an exemplary embodiment, the operation temperature of the outdoor unit includes an outdoor environment temperature or a coil temperature of an outdoor unit heat exchanger, and the second heating condition determining module 5 includes:
a third judgment unit for judging whether a difference between a discharge temperature of the compressor and the outdoor ambient temperature is less than a third threshold, and if so, determining that the second heating condition is satisfied;
and the fourth judging unit is used for judging whether the difference value between the exhaust temperature of the compressor and the temperature of the coil of the outdoor unit heat exchanger is smaller than a fourth threshold value, and if so, determining that the second heating condition is met.
In one exemplary embodiment, the first heating condition determination module 2 further includes:
the power-off unit is used for judging whether the heating running time of the heat pump air conditioner reaches a set threshold or not or whether a shutdown signal exists or not; the shutdown signal is a shutdown signal for stopping the compressor when detecting that the indoor temperature reaches a set value in the running process of the heat pump air conditioner;
and if not, controlling the oil temperature heating belt to be powered off.
In an exemplary embodiment, the oil temperature heating zone control apparatus of the heat pump air conditioner further includes:
the fifth judging module is used for controlling the oil temperature heating belt to be powered off when the difference value between the exhaust temperature of the compressor and the water inlet temperature is larger than or equal to a fifth threshold value, wherein the fifth threshold value is larger than the first threshold value;
the sixth judgment module is used for controlling the oil temperature heating belt to be powered off when the difference value between the exhaust temperature of the compressor and the temperature of a coil of the indoor unit heat exchanger is larger than or equal to a sixth threshold value, wherein the sixth threshold value is larger than the second threshold value;
in an exemplary embodiment, the oil temperature heating zone control apparatus of the heat pump air conditioner further includes:
the seventh judging module is used for controlling the oil temperature heating belt to be powered off when the difference value between the exhaust temperature of the compressor and the outdoor environment temperature is larger than or equal to a seventh threshold value, wherein the seventh threshold value is larger than the third threshold value;
and the eighth judging module is used for controlling the oil temperature heating belt to be powered off when the difference value between the exhaust temperature of the compressor and the temperature of the coil of the outdoor unit heat exchanger is greater than or equal to an eighth threshold value, wherein the eighth threshold value is greater than the fourth threshold value.
In an exemplary embodiment, the oil temperature heating zone control apparatus of the heat pump air conditioner further includes:
the first power-on judging module is used for controlling the oil temperature heating belt to be electrified and acquiring the exhaust temperature of the compressor when the heat pump air conditioner is powered on for the first time;
and the first time electric control module controls the oil temperature heating belt to be powered off when the exhaust temperature of the compressor is greater than or equal to a ninth threshold value.
In an exemplary embodiment, the oil temperature heating zone control apparatus of the heat pump air conditioner further includes:
and the defrosting module is used for controlling the oil temperature heating belt to be electrified when the heat pump air conditioner is in a defrosting mode.
As shown in fig. 5, an embodiment of the present application further provides a heat pump air conditioner, including: the air conditioner comprises a controller 100, a compressor 200, an indoor unit 300 and an outdoor unit 400, wherein an oil temperature heating belt 210 is arranged at the bottom of the compressor 200, and the controller 100 comprises a memory 110 and a processor 120;
the memory 110 for storing one or more programs;
when the one or more programs are executed by the processor 120, the processor 120 implements the heat pump air conditioner oil temperature heating zone control method according to any one of the above.
In this application embodiment, through detecting heat pump air conditioner's operating mode, operating condition to according to the exhaust temperature of compressor, the operating temperature of indoor set and the operating temperature of off-premises station, utilize a plurality of heating conditions that indicate that hydrops appears in the compressor bottom, the intelligent control oil temperature heating band power-on and power-off improves heat pump air conditioner and oil temperature heating band's reliability and life.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (10)
1. A method for controlling an oil temperature heating zone of a heat pump air conditioner is characterized by comprising the following steps:
when the heat pump air conditioner is in a heating mode, acquiring the exhaust temperature of a compressor and the operating temperature of an indoor unit;
determining whether a first heating condition is satisfied according to a difference between a discharge temperature of the compressor and an operating temperature of the indoor unit; wherein the first heating condition is used for indicating heating of lubricating oil at the bottom of the compressor;
and when the first heating condition is met, controlling the oil temperature heating belt to be electrified.
2. The oil temperature heating belt control method of a heat pump air conditioner according to claim 1, wherein the operation temperature of the indoor unit includes a water inlet temperature or a coil temperature of an indoor unit heat exchanger, and the determining whether the first heating condition is satisfied according to a difference between a discharge temperature of the compressor and the operation temperature of the indoor unit includes:
judging whether the difference value between the exhaust temperature of the compressor and the water inlet temperature is smaller than a first threshold value, and if so, determining that the first heating condition is met;
or judging whether the difference value between the exhaust temperature of the compressor and the temperature of a coil of the heat exchanger of the indoor unit is smaller than a second threshold value, and if so, determining that the first heating condition is met.
3. The oil temperature heating belt control method of a heat pump air conditioner according to claim 1, further comprising the steps of:
when the heat pump air conditioner is in a refrigeration mode, acquiring the exhaust temperature of a compressor and the operating temperature of an outdoor unit;
determining whether a second heating condition is satisfied according to a difference between a discharge temperature of the compressor and an operating temperature of an outdoor unit; wherein the second heating condition is used for indicating heating of the lubricating oil at the bottom of the compressor;
and when the second heating condition is met, controlling the oil temperature heating belt to be electrified.
4. The method of claim 3, wherein the operating temperature of the outdoor unit includes an outdoor ambient temperature or a coil temperature of an outdoor unit heat exchanger, and the determining whether the second heating condition is satisfied according to the discharge temperature of the compressor and the operating temperature of the outdoor unit includes:
judging whether the difference between the discharge temperature of the compressor and the outdoor environment temperature is smaller than a third threshold value, and if so, determining that the second heating condition is met;
or judging whether the difference value between the discharge temperature of the compressor and the temperature of the coil of the outdoor unit heat exchanger is smaller than a fourth threshold value, and if so, determining that the second heating condition is met.
5. The oil temperature heating zone control method of a heat pump air conditioner according to claim 3, wherein before determining whether the first heating condition is satisfied according to a difference between a discharge temperature of the compressor and an operating temperature of the indoor unit, further comprising:
detecting whether the running time of the heat pump air conditioner in a heating mode reaches a set threshold value or not, or detecting whether the heat pump air conditioner is in a standby state of the heating mode or not;
before determining whether the second heating condition is satisfied according to the difference between the discharge temperature of the compressor and the operation temperature of the outdoor unit, the method further includes:
detecting whether the running time of the heat pump air conditioner in the refrigeration mode reaches a set threshold value or not, or detecting whether the heat pump air conditioner is in the standby state of the refrigeration mode or not.
6. The oil temperature heating belt control method of a heat pump air conditioner according to claim 2, wherein controlling the oil temperature heating belt to be energized when the first heating condition is satisfied, further comprising:
when the difference value between the exhaust temperature of the compressor and the water inlet temperature is larger than or equal to a fifth threshold value, controlling the oil temperature heating belt to be powered off, wherein the fifth threshold value is larger than the first threshold value;
or when the difference value between the exhaust temperature of the compressor and the temperature of a coil of the indoor unit heat exchanger is larger than or equal to a sixth threshold value, controlling the oil temperature heating zone to be powered off, wherein the sixth threshold value is larger than the second threshold value.
7. The method for controlling the oil temperature heating belt of the heat pump air conditioner as claimed in claim 4, further comprising, after controlling the oil temperature heating belt to be electrified while satisfying the second heating condition:
when the difference value between the discharge temperature of the compressor and the outdoor environment temperature is larger than or equal to a seventh threshold value, controlling the oil temperature heating belt to be powered off, wherein the seventh threshold value is larger than the third threshold value;
or when the difference value between the discharge temperature of the compressor and the temperature of a coil of the outdoor unit heat exchanger is greater than or equal to an eighth threshold value, controlling the oil temperature heating belt to be powered off, wherein the eighth threshold value is greater than the fourth threshold value.
8. The oil temperature heating belt control method of a heat pump air conditioner according to claim 1, further comprising the steps of:
when the heat pump air conditioner is electrified for the first time, controlling the oil temperature heating belt to be electrified and acquiring the exhaust temperature of the compressor;
and when the exhaust temperature of the compressor is greater than or equal to a ninth threshold value, controlling the oil temperature heating belt to be powered off.
9. An oil temperature heating zone control device of a heat pump air conditioner is characterized by comprising:
the first temperature acquisition module is used for acquiring the exhaust temperature of the compressor and the running temperature of the indoor unit when the heat pump air conditioner is in a heating mode;
the first heating condition determining module is used for determining whether a first heating condition is met according to a difference value between the exhaust temperature of the compressor and the running temperature of the indoor unit; wherein the first heating condition is used for indicating heating of lubricating oil at the bottom of the compressor;
and the first heating module is used for controlling the oil temperature heating belt to be electrified when the first heating condition is met.
10. A heat pump air conditioner comprising: the air conditioner comprises a controller, a compressor, an indoor unit and an outdoor unit, wherein an oil temperature heating belt is arranged at the bottom of the compressor;
the memory for storing one or more programs;
when the one or more programs are executed by the processor, the processor is caused to implement the heat pump air conditioner oil temperature heating zone control method according to any one of claims 1-8.
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| CN202010376329.3A CN111664556A (en) | 2020-05-07 | 2020-05-07 | Oil temperature heating belt control method and device of heat pump air conditioner and heat pump air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010376329.3A CN111664556A (en) | 2020-05-07 | 2020-05-07 | Oil temperature heating belt control method and device of heat pump air conditioner and heat pump air conditioner |
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