CN111780361B - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN111780361B CN111780361B CN202010614305.7A CN202010614305A CN111780361B CN 111780361 B CN111780361 B CN 111780361B CN 202010614305 A CN202010614305 A CN 202010614305A CN 111780361 B CN111780361 B CN 111780361B
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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
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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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
- F24F11/41—Defrosting; Preventing freezing
- F24F11/43—Defrosting; Preventing freezing of indoor units
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner, which comprises: a compressor for compressing and discharging a refrigerant; an indoor heat exchanger for performing heat exchange between refrigerant and indoor air; the return air temperature sensor is used for detecting the return air temperature of the compressor; the coil temperature sensor is used for detecting the coil temperature of the indoor heat exchanger; the control section is configured to include: when the indoor heat exchanger is frosted, acquiring the temperature of a coil pipe and the temperature of return air; determining temperature detection for triggering an anti-freezing mode of the air conditioner according to the temperature of the coil and the return air temperature; wherein the temperature detection comprises coil pipe temperature detection and return air temperature detection; according to a detection result corresponding to the temperature detection of the triggered anti-freezing mode, calculating an anti-freezing value; and controlling the running frequency of the compressor according to the anti-freezing value. The air conditioner disclosed by the invention can realize that the anti-freezing mode is respectively and independently triggered by adopting the coil temperature detection and the return air temperature detection.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner which can respectively and independently trigger an anti-freezing mode by adopting coil temperature detection and return air temperature detection.
Background
At present, the existing air conditioner generally has an anti-freezing function, and an anti-freezing mode of the air conditioner is triggered according to the temperature of an inner disc detected by a sensor so as to prevent the air conditioner from being damaged when the air conditioner operates in a low-temperature environment; specifically, when the temperature of the inner plate of the air conditioner is 7 ℃, the frequency increase of the compressor is forbidden; when the temperature of the inner disc is 5 ℃, the compressor slowly reduces the frequency; when the temperature of the inner disc is 3 ℃, the compressor quickly reduces the frequency; when the temperature of the inner disc is 1 ℃, the compressor is stopped.
However, there are also the following problems in the actual use of the air conditioner: under the condition that the outdoor temperature is low, when the air conditioner operates in a refrigerating mode, the supercooling degree of a refrigerant before entering the evaporator is large, and the humidity of the throttled refrigerant is also large, so that the phenomenon of uneven distribution of the refrigerant can occur in the evaporator, the refrigerant passing through a flow path where the inner disc is located is reduced, and the detected temperature of the inner disc is not the actual lowest temperature of the evaporator. Therefore, when the freezing condition of the indoor unit is judged by adopting the temperature of the inner disc so as to trigger the anti-freezing mode of the air conditioner, the phenomenon that the air conditioner continuously freezes and blows water is easy to occur.
In order to solve the problem, a double-inner-disc detection mode is generally adopted to trigger an anti-freezing mode of the air conditioner. However, when the dual inner panel detection method is adopted, an additional sensor is required, thereby resulting in an increase in hardware cost of the air conditioner.
Disclosure of Invention
The embodiment of the invention provides an air conditioner, which can realize that the anti-freezing mode of the air conditioner is respectively and independently triggered by adopting coil pipe temperature detection and return air temperature detection.
An air conditioner provided in a first embodiment of the present invention includes:
a compressor for compressing and discharging a refrigerant;
an indoor heat exchanger for performing heat exchange between refrigerant and indoor air;
the return air temperature sensor is used for detecting the return air temperature of the compressor;
a coil temperature sensor for detecting a coil temperature of the indoor heat exchanger; and the number of the first and second groups,
the control section is configured to include:
when the indoor heat exchanger is frosted, acquiring the coil temperature sent by the coil temperature sensor and the return air temperature sent by the return air temperature sensor;
determining temperature detection for triggering an anti-freezing mode of the air conditioner according to the temperature of the coil and the return air temperature; wherein the temperature detection comprises coil temperature detection and return air temperature detection;
according to a detection result corresponding to the temperature detection of the triggered anti-freezing mode, calculating an anti-freezing value;
and controlling the running frequency of the compressor according to the anti-freezing value.
In the air conditioner provided in the first embodiment of the present invention, the coil temperature detection and the return air temperature detection are performed in parallel, and the coil temperature detection and the return air temperature detection can both separately trigger the anti-freezing mode of the air conditioner, so as to ensure that one of the temperature detections can play a role in anti-freezing protection. Therefore, the problem that the freezing prevention function is invalid when the evaporator is unevenly distributed can be effectively solved, the stability and the reliability of the operation of the air conditioner are greatly improved, an additional hardware device is not needed to be added, the operation can be realized only by the configuration of the optimization control part, the air conditioner has the characteristic of low cost, and in addition, the protection for over-low refrigeration suction temperature can be effectively increased.
In an air conditioner provided in a second embodiment of the present invention, the control section is configured to further include:
the determining and triggering temperature detection of an anti-freezing mode of the air conditioner according to the coil temperature and the return air temperature specifically includes:
calculating the anti-freezing coefficient of the coil according to the temperature of the coil and a preset inner disc constant;
calculating a return air anti-freezing coefficient according to the return air temperature and a preset return air constant;
and determining and triggering temperature detection of an anti-freezing mode of the air conditioner by judging the anti-freezing coefficient of the coil pipe and the anti-freezing coefficient of the return air.
In the air conditioner provided in the second embodiment of the present invention, the anti-freezing coefficient of the coil and the anti-freezing coefficient of the return air are calculated to further determine the magnitudes of the anti-freezing coefficient of the coil and the anti-freezing coefficient of the return air, so as to determine the temperature detection triggering the anti-freezing mode of the air conditioner from the coil temperature detection and the return air temperature detection, thereby ensuring that one of the coil temperature detection and the return air temperature detection can play a role in anti-freezing protection, and at the same time, protecting the too low suction temperature of the refrigeration mode.
In the air conditioner provided in the third embodiment of the present invention, the control section is configured to further include:
the determining the temperature detection triggering the anti-freezing mode of the air conditioner by judging the anti-freezing coefficient of the coil pipe and the return air anti-freezing coefficient specifically comprises:
when the anti-freezing coefficient of the coil pipe is larger than or equal to the return air anti-freezing coefficient, determining that the coil pipe temperature detection triggers an anti-freezing mode;
and when the anti-freezing coefficient of the coil pipe is smaller than the return air anti-freezing coefficient, determining that the return air temperature detection triggers an anti-freezing mode.
In the air conditioner provided in the third embodiment of the present invention, the temperature detection triggering the anti-freezing mode is determined by determining the anti-freezing coefficient of the coil and the anti-freezing coefficient of the return air, so that the parallel detection of the coil temperature detection and the return air temperature detection is realized, and the two can respectively trigger the anti-freezing function independently, thereby ensuring that one of the two can play the anti-freezing role in temperature detection.
In an air conditioner provided in a fourth embodiment of the present invention, the control section is configured to further include:
calculating the anti-freezing coefficient of the coil by the following formula:
a＝A/Tcoil pipe
Wherein a is the anti-freezing coefficient of the coil pipe, A is the constant of the inner plate, and TCoil pipeIs the coil temperature;
calculating the return air anti-freezing coefficient by the following formula:
b＝B/Treturn air
Wherein B is the anti-freezing coefficient of the coil, B is the return air constant, and TReturn airIs the return air temperature; calculating the freezing point prevention value by the following formula:
P＝IF(a≥b,"a","b")×c
wherein P is the anti-freezing value, and c is a preset anti-freezing value calculation constant.
In the air conditioner provided in the fourth embodiment of the present invention, the freezing prevention function of the air conditioner is ensured by obtaining the freezing prevention value, and the protection of the excessively low suction temperature in the cooling mode is realized.
In an air conditioner provided in a fifth embodiment of the present invention, the control section is configured to further include:
and controlling the operating frequency of the compressor according to the anti-freezing value and preset anti-freezing mode control conditions.
In the air conditioner according to the fifth embodiment of the present invention, since the operating frequency of the compressor is controlled according to the antifreeze mode control condition, the antifreeze mode control condition is set in advance such that the operating frequency of the compressor is controlled in accordance with the antifreeze value and the antifreeze mode control condition.
In an air conditioner provided in a sixth embodiment of the present invention, the anti-freeze mode control condition includes a condition that the anti-freeze value is less than a first threshold value as a condition for controlling the compressor to operate at a preset normal frequency.
In the air conditioner provided in the sixth embodiment of the present invention, when the freezing prevention value is less than the first threshold value, the condition that the compressor is operated at the preset normal frequency is controlled so that the compressor is normally operated.
In an air conditioner according to a seventh embodiment of the present invention, the freeze prevention mode control condition includes a condition that the freeze prevention value is equal to or greater than the first threshold value and is less than a second threshold value as a condition for controlling the compressor to prohibit an up-conversion operation.
In an air conditioner according to a seventh embodiment of the present invention, when the freezing prevention value is equal to or greater than the first threshold value and is smaller than the second threshold value, the compressor is controlled to prohibit the up-conversion operation.
In an air conditioner according to an eighth embodiment of the present invention, the antifreeze mode control condition includes a condition that the antifreeze value is equal to or greater than the second threshold value and less than a third threshold value as a condition for controlling the compressor to perform the down-conversion operation at the preset first rate.
In the air conditioner provided in the eighth embodiment of the present invention, when the anti-freezing value is greater than or equal to the second threshold value and is less than the third threshold value, the compressor is controlled to perform the down-conversion operation at the preset first speed, so that the compressor is slowly down-converted.
In the air conditioner according to the ninth embodiment of the present invention, the anti-freeze mode control condition includes a condition that the anti-freeze value is equal to or greater than the third threshold value and is less than a fourth threshold value as a condition for controlling the compressor to perform the down-conversion operation at the preset second speed; wherein the second rate is greater than the first rate.
In the air conditioner provided in the ninth embodiment of the present invention, when the anti-freezing value is greater than or equal to the third threshold and smaller than the fourth threshold, the compressor is controlled to perform down-conversion operation at the preset second speed, so that the compressor is quickly down-converted.
In an air conditioner according to a tenth embodiment of the present invention, the anti-freeze mode control condition includes a condition that the anti-freeze value is equal to or greater than the fourth threshold value as a condition for controlling the compressor to stop.
In an air conditioner according to a tenth embodiment of the present invention, when the freezing prevention value is equal to or greater than the fourth threshold value, the compressor is controlled to stop.
The air conditioner provided by the embodiment of the invention has the following beneficial effects:
in the air conditioner provided by the first embodiment of the invention, the problem of failure of the anti-freezing function when the evaporator is unevenly distributed can be effectively solved, the stability and the reliability of the operation of the air conditioner are greatly improved, meanwhile, no additional hardware device is needed to be added, the operation can be realized only by optimizing the configuration of the control part, the air conditioner has the characteristic of low cost, and in addition, the protection on the over-low refrigeration suction temperature can be effectively increased.
In the air conditioner provided by the second to fourth embodiments of the present invention, parallel detection of the coil temperature detection and the return air temperature detection is implemented, and the two may respectively and independently trigger the anti-freezing function, so as to ensure that one of the two temperature detections can perform the anti-freezing function, and protect the too low suction temperature in the cooling mode.
In the air conditioner provided in the fifth to tenth embodiments of the present invention, the operation frequency of the compressor can be controlled according to the freezing prevention value and the freezing prevention mode control condition, so that the air conditioner can perform freezing prevention protection.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic control flow diagram of a control unit of an air conditioner according to an embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating the operation of triggering the freeze prevention mode of the air conditioner according to the embodiment of the present invention;
fig. 4 is a schematic diagram of a specific embodiment of a control flow configured by the control unit according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention. The air conditioner provided by the embodiment of the invention comprises a compressor 1, an indoor heat exchanger 2, a return air temperature sensor 4, a coil pipe temperature sensor 3 and a control part 5. Wherein, the compressor 1, is used for compressing and discharging the refrigerant; an indoor heat exchanger 2 for performing heat exchange between refrigerant and indoor air; the coil temperature sensor 3 is arranged on an indoor unit evaporator and used for detecting the coil temperature of the indoor heat exchanger; the return air temperature sensor 4 is installed on the outdoor unit, and is used for detecting the return air temperature of the compressor 1.
In an embodiment, referring to fig. 2, a schematic control flow diagram of a control unit of an air conditioner according to an embodiment of the present invention is shown, where the control unit 5 is configured to include:
s11, when the indoor heat exchanger is frosted, acquiring the coil temperature sent by the coil temperature sensor and the return air temperature sent by the return air temperature sensor;
s12, determining and triggering temperature detection of an anti-freezing mode of the air conditioner according to the temperature of the coil and the return air temperature; wherein the temperature detection comprises coil temperature detection and return air temperature detection;
s13, calculating an anti-freezing value according to a detection result corresponding to the temperature detection of the triggered anti-freezing mode;
and S14, controlling the running frequency of the compressor according to the anti-freezing value.
When the indoor unit evaporator is frosted, the return air temperature is lower than the normal value due to insufficient evaporation of the refrigerant, whether the whole is frosted or part of the flow path is frosted. Therefore, in the embodiment of the present invention, the control unit 5 obtains the coil temperature of the indoor heat exchanger 2 through the coil temperature sensor 3, and obtains the return air temperature of the compressor 1 through the return air temperature sensor 4. Further, parallel detection of coil pipe temperature detection and return air temperature detection is achieved, and the coil pipe temperature detection and the return air temperature detection can respectively and independently trigger an anti-freezing mode of the air conditioner, so that one temperature detection can play a role in anti-freezing protection. Further, an anti-freezing value is calculated based on a detection result corresponding to the temperature detection triggering the anti-freezing mode to control the operation frequency of the compressor according to the anti-freezing value. At this moment, the problem of freezing function failure is prevented when this embodiment can effectively solve the evaporimeter reposition of redundant personnel inhomogeneous, has improved the stability and the reliability of air conditioner operation greatly, need not to increase extra hardware device simultaneously, only can realize through the configuration of optimal control portion, has with low costs characteristics, in addition through the detection to the return air temperature is too low, can effectively increase the protection to the refrigeration temperature of breathing in is crossed too low.
In some embodiments, referring to fig. 3, the flowchart of triggering the anti-freeze mode of the air conditioner according to the embodiment of the present invention is shown, and the control portion 5 is configured to further include:
s121, calculating an anti-freezing coefficient of the coil according to the temperature of the coil and a preset inner disc constant;
s122, calculating a return air anti-freezing coefficient according to the return air temperature and a preset return air constant;
and S123, determining and triggering temperature detection of an anti-freezing mode of the air conditioner by judging the anti-freezing coefficient of the coil pipe and the anti-freezing coefficient of the return air.
In this embodiment, the inner disc constant and the return air constant are preset, and then the anti-freezing coefficient of the coil pipe and the return air anti-freezing coefficient are calculated. Wherein, when the temperature of the coil is lower, the anti-freezing coefficient of the coil is higher; when the return air temperature is lower, the return air anti-freezing coefficient is higher. Further, the anti-freezing coefficient of the coil and the anti-freezing coefficient of the return air are judged, so that the temperature detection for triggering the anti-freezing mode of the air conditioner is determined from the coil temperature detection and the return air temperature detection. Therefore, the device ensures that one of the temperature detection of the coil pipe temperature and the return air temperature can play a role in anti-freezing protection, and simultaneously, the device can protect the over-low suction temperature in the refrigeration mode.
In some embodiments, referring to fig. 3, step S123 includes:
s1231, when the anti-freezing coefficient of the coil pipe is larger than or equal to the return air anti-freezing coefficient, determining that the coil pipe temperature detection triggers an anti-freezing mode;
s1232, when the anti-freezing coefficient of the coil is smaller than the return air anti-freezing coefficient, determining that the return air temperature detection triggers an anti-freezing mode.
Specifically, when the anti-freezing coefficient of the coil is greater than or equal to the return air anti-freezing coefficient, the coil temperature detection is considered to be effective at the moment, the return air temperature detection is invalid, and the coil temperature detection triggers an anti-freezing mode. When the anti-freezing coefficient of the coil is smaller than the return air anti-freezing coefficient, the return air temperature detection is considered to be effective, the coil temperature detection is invalid, and the return air temperature detection triggers an anti-freezing mode. In the embodiment, the temperature detection of the anti-freezing mode is triggered by judging the anti-freezing coefficient of the coil and the return air anti-freezing coefficient, so that the parallel detection of the temperature detection of the coil and the return air temperature detection is realized, the anti-freezing function can be triggered independently respectively, and the anti-freezing function of one of the temperature detection and the return air temperature detection can be ensured.
In a specific embodiment, the control portion 5 is configured to further include:
calculating the anti-freezing coefficient of the coil by the following formula:
a＝A/Tcoil pipe
Wherein a is the anti-freezing coefficient of the coil pipe, A is the constant of the inner plate, and TCoil pipeIs the coil temperature;
calculating the return air anti-freezing coefficient by the following formula:
b＝B/Treturn air
Wherein B is the anti-freezing coefficient of the coil, B is the return air constant, and TReturn airIs the return air temperature;
calculating the freezing point prevention value by the following formula:
P＝IF(a≥b,"a","b")×c
wherein P is the anti-freezing value, and c is a preset anti-freezing value calculation constant.
In this embodiment, the control unit 5 performs parallel detection of the coil temperature detection and the return air temperature detection by using the IF function, and at this time, the anti-freezing function of the air conditioner can be normally operated as long as one of the coil temperature detection and the return air temperature detection is effective. Wherein the control logic of the IF function corresponds to steps S1231 and S1232. Preferably, the anti-freezing value calculation constant may be preset to 10 for the convenience of subsequent processing of the anti-freezing value, but is not limited thereto. Therefore, the anti-freezing function of the air conditioner is ensured by obtaining the anti-freezing value, the stability of the system is greatly improved, and the use experience of a user is improved. And the configuration of the control part realizes the protection of the over-low air suction temperature in the refrigeration mode.
In some embodiments, the control section 5 is configured to further include: and controlling the operating frequency of the compressor 1 according to the anti-freezing value and the preset anti-freezing mode control condition. Since the operating frequency of the compressor is controlled according to the anti-freeze mode control condition, the control unit 5 sets the anti-freeze mode control condition in advance such that the operating frequency of the compressor 1 is controlled in combination with the anti-freeze value and the anti-freeze mode control condition.
In a preferred embodiment, the anti-freeze mode control condition includes a condition that the anti-freeze value is less than a first threshold value as a condition for controlling the compressor to operate at a preset normal frequency.
Specifically, when the anti-freezing value is smaller than the first threshold value, the compressor 1 is controlled to operate at a preset normal frequency, so that the compressor 1 operates normally. Wherein the normal frequency may be an operation frequency corresponding to a normal operation mode of the compressor 1.
In a preferred embodiment, the anti-freeze mode control condition includes a condition that the anti-freeze value is equal to or greater than the first threshold value and less than a second threshold value as a condition for controlling the compressor 1 to prohibit the up-conversion operation. Specifically, when the anti-freezing value is greater than or equal to the first threshold value and less than a second threshold value, the up-conversion operation of the compressor 1 is controlled to be prohibited.
In a preferred embodiment, the anti-freeze mode control condition includes a condition that the anti-freeze value is equal to or greater than the second threshold value and less than a third threshold value as a condition for controlling the compressor 1 to operate at the preset first rate of the down-conversion.
Specifically, when the anti-freezing value is greater than or equal to the second threshold value and less than a third threshold value, the compressor 1 is controlled to perform frequency reduction operation at a preset first speed, so that the rotating speed of the compressor performs slow frequency reduction at the first speed.
In a preferred embodiment, the anti-freeze mode control condition includes a condition that the anti-freeze value is equal to or greater than the third threshold value and less than a fourth threshold value as a condition for controlling the compressor 1 to perform a down-conversion operation at a preset second rate; wherein the second rate is greater than the first rate.
Specifically, when the anti-freezing value is greater than or equal to the third threshold and smaller than the fourth threshold, the compressor 1 is controlled to perform frequency reduction operation at a preset second speed, so that the rotating speed of the compressor is rapidly reduced at the second speed.
In a preferred embodiment, the anti-freeze mode control condition includes a condition that the anti-freeze value is equal to or greater than the fourth threshold value as a condition for controlling the shutdown of the compressor 1. Specifically, when the anti-freezing value is greater than or equal to the fourth threshold value, the compressor 1 is controlled to stop.
In one embodiment, for example, the inner disc constant of the air conditioner is preset to be a-7, the return air constant is preset to be B-10, and the freezing prevention value calculation constant is preset to be c-10. Further, the temperature of the coil pipe is acquired to be TCoil pipe26 and the return air temperature is T Return air4. At this time, the antifreeze coefficient of the coil is calculated to be a, 7/26, and the antifreeze coefficient of the return air is a, 10/4, so that the antifreeze coefficient of the coil is smaller than the antifreeze coefficient of the return air, the temperature detection of the coil fails, and the detection of the return air temperature triggers the antifreeze mode. Further, the freezing prevention value is calculated
Further, referring to fig. 4, it is a schematic diagram of a specific embodiment of the control flow configured by the control unit according to the embodiment of the present invention, where the first threshold value is 10, the second threshold value is 15, the third threshold value is 20, and the fourth threshold value is 25 in the anti-freeze mode control condition are preset. Therefore, when the anti-freezing value is less than 10, the compressor is controlled to normally operate; when the anti-freezing value is more than or equal to 10 and less than 15, controlling the compressor to prohibit increasing the frequency; when the anti-freezing value is more than or equal to 15 and less than 20, controlling the compressor to slow down the frequency; when the anti-freezing value is more than or equal to 20 and less than 25, controlling the compressor to quickly reduce the frequency; and when the anti-freezing value is more than or equal to 25, controlling the compressor to stop. The compressor stop is controlled in the present embodiment according to the above-described anti-freeze mode control condition. Therefore, the anti-freezing protection can be ensured under the condition that the temperature detection of the coil pipe is failed.
The air conditioner provided by the embodiment of the invention has the following beneficial effects:
the coil pipe temperature detection and the return air temperature detection are carried out in parallel, the anti-freezing mode of the air conditioner can be triggered independently by the coil pipe temperature detection and the return air temperature detection, the anti-freezing protection effect can be achieved by ensuring one temperature detection, the problem of anti-freezing function failure when the evaporator is unevenly distributed can be effectively solved, the stability and the reliability of the operation of the air conditioner are greatly improved, meanwhile, an additional hardware device is not needed to be added, the operation can be achieved only through configuration of an optimization control part, the air conditioner has the characteristic of low cost, and in addition, the protection for over-low refrigeration suction temperature can be effectively increased.
The anti-freezing coefficient of the coil and the return air anti-freezing coefficient are calculated, so that the anti-freezing coefficient of the coil and the return air anti-freezing coefficient are judged, the temperature detection for triggering the anti-freezing mode of the air conditioner is determined from the temperature detection of the coil and the temperature detection of the return air, the air conditioner is ensured to play a role in anti-freezing protection, and meanwhile, the too low air suction temperature of the refrigeration mode is protected.
The running frequency of the compressor is controlled by combining the anti-freezing value and the anti-freezing mode control condition, so that the anti-freezing protection of the air conditioner is realized, and the running stability of the air conditioner is greatly improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (7)
1. An air conditioner, characterized in that the air conditioner comprises:
a compressor for compressing and discharging a refrigerant;
an indoor heat exchanger for performing heat exchange between refrigerant and indoor air;
the return air temperature sensor is used for detecting the return air temperature of the compressor;
a coil temperature sensor for detecting a coil temperature of the indoor heat exchanger; and the number of the first and second groups,
the control section is configured to include:
when the indoor heat exchanger is frosted, acquiring the coil temperature sent by the coil temperature sensor and the return air temperature sent by the return air temperature sensor;
determining temperature detection for triggering an anti-freezing mode of the air conditioner according to the temperature of the coil and the return air temperature; wherein the temperature detection comprises coil temperature detection and return air temperature detection;
according to a detection result corresponding to the temperature detection of the triggered anti-freezing mode, calculating an anti-freezing value;
controlling the running frequency of the compressor according to the anti-freezing value;
the control section is configured to further include:
the determining and triggering temperature detection of an anti-freezing mode of the air conditioner according to the coil temperature and the return air temperature specifically includes:
calculating the anti-freezing coefficient of the coil according to the temperature of the coil and a preset inner disc constant;
calculating a return air anti-freezing coefficient according to the return air temperature and a preset return air constant;
determining temperature detection for triggering an anti-freezing mode of the air conditioner by judging the anti-freezing coefficient of the coil pipe and the return air anti-freezing coefficient;
the control section is configured to further include:
the determining the temperature detection triggering the anti-freezing mode of the air conditioner by judging the anti-freezing coefficient of the coil pipe and the return air anti-freezing coefficient specifically comprises:
when the anti-freezing coefficient of the coil pipe is larger than or equal to the return air anti-freezing coefficient, determining that the coil pipe temperature detection triggers an anti-freezing mode;
when the anti-freezing coefficient of the coil pipe is smaller than the return air anti-freezing coefficient, determining that the return air temperature detection triggers an anti-freezing mode;
the control section is configured to further include:
calculating the anti-freezing coefficient of the coil by the following formula:
a＝A/Tcoil pipe
Wherein a is the anti-freezing coefficient of the coil pipe, A is the constant of the inner plate, and TCoil pipeIs the coil temperature;
calculating the return air anti-freezing coefficient by the following formula:
b＝B/Treturn air
Wherein B is the anti-freezing coefficient of the coil, B is the return air constant, and TReturn airIs the return air temperature;
calculating the freezing point prevention value by the following formula:
P＝IF(a≥b,"a","b")×c
wherein P is the anti-freezing value, and c is a preset anti-freezing value calculation constant.
2. The air conditioner according to claim 1, wherein the control portion is configured to further include:
and controlling the operating frequency of the compressor according to the anti-freezing value and preset anti-freezing mode control conditions.
3. The air conditioner according to claim 2, wherein the anti-freezing mode control condition includes a condition that the anti-freezing value is less than a first threshold value as a condition for controlling the compressor to operate at a preset normal frequency.
4. The air conditioner according to claim 3, wherein the anti-freeze mode control condition includes a condition that the anti-freeze value is equal to or greater than the first threshold value and less than a second threshold value as a condition for controlling the compressor to prohibit an up-conversion operation.
5. The air conditioner according to claim 4, wherein the anti-freezing mode control condition includes a condition that the anti-freezing value is equal to or greater than the second threshold value and less than a third threshold value as a condition for controlling the compressor to operate at the preset first rate of the down-conversion.
6. The air conditioner according to claim 5, wherein the anti-freeze mode control condition includes a condition that the anti-freeze value is equal to or greater than the third threshold value and less than a fourth threshold value as a condition for controlling the compressor to operate down at a preset second rate; wherein the second rate is greater than the first rate.
7. The air conditioner according to claim 6, wherein the anti-freezing mode control condition includes a condition that the anti-freezing value is equal to or greater than the fourth threshold value as a condition for controlling the compressor to be stopped.
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| CN202010614305.7A CN111780361B (en) | 2020-06-30 | 2020-06-30 | Air conditioner |
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| JPH09126601A (en) * | 1995-10-27 | 1997-05-16 | Matsushita Electric Ind Co Ltd | Controller for air conditioner |
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| CN1828153A (en) * | 2005-12-21 | 2006-09-06 | 广东科龙电器股份有限公司 | Self-adaptive type super low temperature refrigeration air conditioner |
| CN205192013U (en) * | 2015-04-09 | 2016-04-27 | 珠海格力电器股份有限公司 | Controlling means and hot and cold water unit prevent frostbite |
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