CN113883690B - Air conditioning apparatus - Google Patents
Air conditioning apparatus Download PDFInfo
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- CN113883690B CN113883690B CN202111241577.8A CN202111241577A CN113883690B CN 113883690 B CN113883690 B CN 113883690B CN 202111241577 A CN202111241577 A CN 202111241577A CN 113883690 B CN113883690 B CN 113883690B
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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
- F24F11/62—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
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioning device.A compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger and a gas-liquid separator are connected through refrigerant pipelines to form a refrigerant loop; the refrigerant filling tank is connected between the compressor and the gas-liquid separator through a refrigerant filling passage; a control valve arranged on the refrigerant filling passage; the controller controls the starting of a refrigeration operation mode and the filling of a refrigerant when the indoor temperature is detected to be within an indoor preset temperature interval range and the outdoor temperature is detected to be within an outdoor preset temperature interval range and is stable; acquiring a corrected value of the outdoor environment temperature, and acquiring a target supercooling degree by combining the optimal target supercooling degree; controlling the superheat degree of the indoor heat exchanger within a preset superheat degree interval range; and when the obtained supercooling degree of the outlet of the outdoor heat exchanger is greater than the target supercooling degree, controlling the control valve to act. The invention solves the problem that the refrigerant filling precision of the traditional air-conditioning system is easy to have errors due to the influence of bad working conditions during the refrigerant filling.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to an improvement of an air conditioning device structure.
Background
The proper refrigerant filling amount is the basis for reliable and efficient operation of the air conditioning system, and the problems of unit performance reduction, even incapability of operation, service life reduction and the like are easily caused when the refrigerant amount is too much or too little. Because the length of the piping is relatively long, the multi-split air-conditioning system usually needs to be additionally filled with refrigerant during installation, a part of refrigerant is carried by an air-conditioning outdoor unit in the current industry, and proportional refrigerant needs to be additionally supplemented according to the length and the pipe diameter of the liquid pipe piping. In some air conditioner updating projects, the piping of the previous air conditioner system is used for reducing the installation workload, but the refrigerant charging amount cannot be calculated according to the piping specification due to the fact that the piping information is lost for too long time, and an installer usually judges the refrigerant charging amount according to the pressure in the system at the moment. Because the system pressure is influenced by various factors such as the ambient temperature, the filled refrigerant is not the proper amount of refrigerant of the system under normal conditions, and the operation effect of the system is influenced. Even if the length of the piping is known, the refrigerant charge amount is not calculated in strict accordance with the refrigerant charge standard due to uneven levels of outside installation service personnel, and the refrigerant is often overcharged or undercharged. For some large-scale projects, the system refrigerant filling amount is large, the filling time is long, manual operation and watching are needed when the refrigerant is filled, and the installation efficiency is seriously influenced.
To the problem that above refrigerant fills to exist, patent number is: 202110732309.X, name: a refrigerant charging method and a refrigerant charging device provide an air conditioning system capable of realizing automatic refrigerant charging. This patent proposes when carrying out the refrigerant automatic filling and annotating, carries out indoor set superheat degree control, system high pressure control, evaporating temperature control, judges the refrigerant volume of system through the system supercooling degree, has increased substantially the automatic precision of annotating of refrigerant. But often can meet comparatively abominable operating mode when actual operation, if lower ambient temperature influences, can cause the machine to carry out effectual control to the refrigerant precision that makes automatic filling produces the error.
Disclosure of Invention
In order to solve the problem that the refrigerant filling precision is easy to have errors due to the influence of severe working conditions when the refrigerant of the conventional air conditioning system is filled in the prior art, the invention provides the novel air conditioning device, which can be used for correcting the supercooling degree by combining the indoor and outdoor environment temperatures to avoid the influence of the severe working conditions on the refrigerant filling, and ensures the refrigerant filling precision.
In order to achieve the purpose, the invention adopts the following technical scheme:
an air conditioning device comprising:
the refrigerant loop is formed by connecting a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger and a gas-liquid separator through refrigerant pipelines;
the refrigerant filling tank is connected between the compressor and the gas-liquid separator through a refrigerant filling passage;
the control valve is arranged on the refrigerant filling channel and used for controlling the on-off of the refrigerant filling channel;
a controller configured to:
when the indoor temperature is detected to be within an indoor preset temperature interval range, the outdoor temperature is detected to be within an outdoor preset temperature interval range and the air conditioning device is in a stable state, the air conditioning device is controlled to start a refrigeration running mode, and the control valve is controlled to be opened for refrigerant charging;
acquiring an outdoor environment temperature correction value according to the outdoor environment temperature and the indoor environment temperature, and acquiring a target supercooling degree by combining the outdoor environment temperature correction and the optimal target supercooling degree;
controlling the superheat degree of the indoor heat exchanger in a preset superheat degree interval range in the charging process;
and when the obtained supercooling degree of the outlet of the outdoor heat exchanger is greater than the target supercooling degree, controlling the control valve to act so as to close the refrigerant filling channel.
In some embodiments of the present application, the controller is further configured to:
and when the variable quantity of the exhaust temperature of the compressor is detected to be within the preset exhaust interval range, judging that the system is stable.
In some embodiments of the present application, the control valve is an electronic expansion valve, and the controller controls the opening of the electronic expansion valve to increase when a difference between a suction superheat of the compressor and a preset suction superheat is detected to be greater than a first preset suction superheat value;
and when the difference between the suction superheat degree of the compressor and the preset suction superheat degree is smaller than a second preset suction superheat degree, the controller controls the opening degree of the electronic expansion valve to be reduced.
In some embodiments of the present application, the control valve is a stop valve disposed on the refrigerant filling channel, and the refrigerant filling channel is further provided with a throttling capillary tube.
In some embodiments of the present application, the outdoor ambient temperature correction value is set to T rev It is calculated by the following formula:
wherein Taave is the outdoor ambient temperature, DEG C; tiave is the indoor ambient temperature, DEG C, and a, b, c, d are constants.
In some embodiments of the present application, the controller is configured to:
and prompting to replace the refrigerant filling tank when detecting that the variation of the supercooling degree of the outlet of the outdoor heat exchanger in the preset time is smaller than a first preset value.
In some embodiments of the present application, the control manner for controlling the superheat degree of the indoor heat exchanger within the preset superheat degree interval range is as follows:
acquiring the superheat degree of an outlet of an indoor heat exchanger of the air conditioning device;
and adjusting the opening degree of an expansion valve of an indoor unit corresponding to the regulator according to the superheat value of the outlet of the indoor heat exchanger so as to control the superheat degree of the outlet of the indoor heat exchanger to be within the range of a preset superheat degree.
In some embodiments of the present application, the opening degree of the indoor expansion valve is controlled to increase when a difference between an outlet superheat degree of the indoor heat exchanger and a preset superheat degree is detected to be greater than a first superheat degree preset value, and the opening degree of the indoor expansion valve is controlled to decrease when a difference between the outlet superheat degree of the indoor heat exchanger and the preset superheat degree is detected to be less than a second superheat degree preset value.
In some embodiments of the present application, the degree of supercooling at the outlet of the outdoor heat exchanger is obtained by the difference between the saturation temperature corresponding to the high pressure of the system and the temperature at the outlet of the outdoor heat exchanger.
In some embodiments of the present application, the air conditioning device includes a charging port, and the refrigerant charging tank is communicated with the charging port through a connection hose.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
according to the air conditioning device, when the refrigerant is filled, the controller controls the superheat degree position of the outlet of the indoor heat exchanger to be within the preset superheat degree interval range so as to reduce the influence of the superheat degree change of the outlet of the indoor heat exchanger on the refrigerant filling precision during the refrigerant filling, and the controller also acquires the corrected value of the outdoor environment temperature according to the detected outdoor environment temperature and indoor environment temperature value, correspondingly acquires the target supercooling degree by combining the optimal target supercooling degree, judges the quantity of the refrigerant required to be filled according to the target supercooling degree, adds correction to the environment temperature, avoids the problem that the refrigerant filling precision has errors due to the influence of severe working conditions, and ensures the refrigerant filling precision.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic configuration diagram of an embodiment of an air conditioning apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic configuration diagram of another embodiment of an air conditioning apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic configuration diagram of another embodiment of an air conditioning apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a refrigerant charging flow of the air conditioning apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic view showing a process of controlling the degree of superheat of an indoor heat exchanger of the air conditioning apparatus according to the embodiment of the present invention;
fig. 6 is a flow chart illustrating the control of the refrigerant filling rate by the electronic expansion valve of the air conditioning apparatus 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 invention, 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 of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection unless otherwise specifically stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
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 invention, "a plurality" means two or more unless otherwise specified.
Example one
An embodiment of an air conditioning device is provided, comprising:
a refrigerant circuit formed by connecting a compressor 100, a four-way valve 200, an outdoor heat exchanger 300, an indoor heat exchanger 400 and a gas-liquid separator 500 through refrigerant pipes;
Four-way valve 200 has one end connected to outdoor heat exchanger 300, one end connected to indoor heat exchanger 400, and the other end connected to compressor 100 and gas-liquid separator 500.
The indoor heat exchanger 400 is connected to the outdoor heat exchanger 300, and a liquid detection cut-off valve 720 is provided on a refrigerant liquid pipe between the indoor heat exchanger 400 and the outdoor heat exchanger 300.
An air side shutoff valve 720 is provided in a refrigerant air pipe between the indoor heat exchanger 400 and the outdoor heat exchanger 300.
In some embodiments of the present disclosure, the indoor heat exchangers 400 are provided in a plurality and connected in parallel, and each indoor heat exchanger 400 is correspondingly provided with an indoor expansion valve 900 for controlling the flow of the refrigerant flowing into the indoor heat exchanger 400.
The outdoor heat exchanger 300 is correspondingly provided with an outdoor expansion valve.
A refrigerant filling tank 600 connected between the compressor 100 and the gas-liquid separator 500 through a refrigerant filling passage;
in some embodiments of the present application, a filling port 610 is disposed on a connection pipeline between the compressor 100 and the gas-liquid separator 500, and the refrigerant filling tank 600 is connected to the filling port 610 through a connection hose 620, and is connected to the connection pipeline between the compressor 100 and the gas-liquid separator 500, so as to fill the refrigerant.
The filling port 610 and the connection hose 620 constitute a refrigerant filling passage.
Before the refrigerant is filled, the refrigerant filling tank 600 is connected to a filling port 610 of the air conditioner through a connection hose 620, and the connection pipe is subjected to an air discharge operation.
Before the refrigerant is automatically filled, the refrigerant filling tank 600 is connected with a connecting pipeline between the compressor 100 and the gas-liquid separator 500, and a proper amount of refrigerant is filled in advance to ensure that the system can operate.
The control valve is arranged on the refrigerant filling channel and used for controlling the on-off of the refrigerant filling channel;
when the refrigerant needs to be filled, the control valve can be controlled to be opened.
When the refrigerant is not required to be filled, the control valve can be controlled to be closed.
A controller configured to:
when the indoor temperature is detected to be within an indoor preset temperature interval range, the outdoor temperature is detected to be within an outdoor preset temperature interval range and the air conditioning device is in a stable state, the air conditioning device is controlled to start a refrigeration running mode, and the control valve is controlled to be opened for refrigerant charging;
the ambient temperature determination is performed before refrigerant charging:
when the ambient temperature satisfies the condition: namely, the outdoor environment temperature is set to be Tw within the range of [ TW 1-TW 2], and [ TW 1-TW 2] is corresponding to the outdoor preset temperature interval.
The indoor environment temperature Tn is in the range of [ Tn 1-Tn 2 ]. [ Tn 1-Tn 2] corresponds to a predetermined indoor temperature range.
Preferably TW1 is more than or equal to-20 ℃, TW2 is less than or equal to 43 ℃, tn1 is more than or equal to 10 ℃, and Tn2 is less than or equal to 35 ℃.
Judging whether the system is in a stable state, wherein the system temperature judgment condition is as follows:
when the variation of the discharge temperature of the compressor 100 within the preset time is detected to be within the preset discharge interval range, it is determined that the system is stable.
That is, after the compressor 100 operates for t time, t is a time constant, for example, 10min, and the variation of the current discharge temperature Td of the compressor 100 within a preset time, for example, w time, w is a time constant, which may be 1min or 2min, etc., is determined.
If the variation is within the range of [ Td-delta Td-Td + delta Td ], namely within the preset exhaust interval, the system is judged to be stably operated.
The system starts to operate, at this time, the four-way valve 200 is closed, the control system enters a cooling operation mode, the outdoor heat exchanger 300 serves as a condenser, and the indoor heat exchanger 400 serves as an evaporator.
And calculating the target supercooling degree to obtain the amount of the refrigerant needing to be filled.
Acquiring an outdoor environment temperature correction value according to the outdoor environment temperature and the indoor environment temperature, and acquiring a target supercooling degree by combining the outdoor environment temperature correction and the optimal target supercooling degree;
theoretically, if the system high-pressure control, the indoor unit superheat degree control and the evaporation temperature control can be realized, the distribution state and the density of the refrigerant in the indoor unit can be controlled to be specific values when the system runs, the density of the refrigerant in the outdoor unit is also controlled to be the specific value, the refrigerant filling amount is only related to the supercooling degree of the outdoor heat exchanger 300, and the refrigerant amount of the system can be accurately judged through the supercooling degree of the system without adopting other parameters for correction. However, as described above, under severe working conditions, accurate constant control of the evaporation temperature and the system high pressure cannot be realized, which results in changes in the density and the gas-liquid phase distribution state of the refrigerant in the heat exchanger of the indoor and outdoor units, and therefore, even if the same on-line scheme is used to fill the same amount of refrigerant at different ambient temperatures during refrigeration operation, only the superheat degree of the indoor unit is controlled, different supercooling degrees can also occur at the outlet of the heat exchanger of the outdoor unit, that is, the target supercooling degree can be influenced by the ambient temperature and changes along with the change of the ambient temperature.
When the air conditioning device provided in this embodiment fills the refrigerant, the supercooling degree value is corrected by combining with the ambient temperature, and the target supercooling degree SCo is recalculated with reference to the ambient temperature to obtain an accurate target supercooling degree, where a calculation formula of the target supercooling degree is as follows:
in the formula: SCo is a target supercooling degree, K;
SC standard the optimal target supercooling degree under the standard refrigeration working condition under the current online scheme is obtained by experiments, and the value of the optimal target supercooling degree is determined by the volume ratio of the indoor unit and the outdoor unit, K;
in some embodiments of the present application, the outdoor ambient temperature correction value is set to T rev K, which is calculated by the following formula:
wherein, T aave Is the temperature of outdoor environmentDegree, DEG C; t is a unit of iave Is the indoor ambient temperature, and a, b, c and d are constants. Preferably a =32.01, b = -0.86405, c = -0.61273, d = -0.014783.
And when the obtained supercooling degree of the outlet of the outdoor heat exchanger 300 is greater than the target supercooling degree, controlling the control valve to act to close the refrigerant filling channel.
In some embodiments of the present application, the degree of subcooling at the outlet of the outdoor heat exchanger 300 is obtained from the difference between the saturation temperature corresponding to the high pressure of the system and the temperature at the outlet of the outdoor heat exchanger 300.
And in the filling process, the supercooling degree SC at the outlet of the outdoor heat exchanger 300 is judged in real time, and the SC is determined by the difference value of the saturation temperature Tdc corresponding to the system high pressure Pd and Te, namely SC = Tdc-Te, K.
If SC is larger than or equal to the target supercooling degree, the filling is finished, the control valve is closed, the refrigerant filling passage is disconnected, and the compressor 100 is stopped.
Controlling the superheat degree of the indoor heat exchanger 400 within a preset superheat degree interval range during the charging process;
in some embodiments of the present application, the control manner for controlling the superheat degree of the indoor heat exchanger 400 within the preset superheat degree interval range is as follows:
acquiring the superheat degree of the outlet of an indoor heat exchanger 400 of the air conditioning device;
and adjusting the opening degree of an expansion valve of the indoor unit corresponding to the superheat value of the outlet of the indoor heat exchanger 400 according to the superheat value of the outlet of the indoor heat exchanger 400 so as to control the superheat value of the outlet of the indoor heat exchanger 400 to be within the range of a preset superheat degree.
In some embodiments of the present application, when it is detected that a difference between an outlet superheat degree of the indoor heat exchanger 400 and a preset superheat degree is greater than a first superheat degree preset value, the opening degree of the indoor expansion valve 900 is controlled to be increased, and when it is detected that a difference between the outlet superheat degree of the indoor heat exchanger 400 and the preset superheat degree is less than a second superheat degree preset value, the opening degree of the indoor expansion valve 900 is controlled to be decreased.
After the indoor unit superheat degree control is started, the initial value control is firstly carried out on the indoor expansion valve 900EVI, then the indoor unit superheat degree SH is judged, if SH is larger than the preset superheat degree SHO by a certain value, the EVI opening degree is increased, if SH is smaller than the preset superheat degree SHO by a certain value, the EVI opening degree is reduced, and the judgment and the adjustment are carried out repeatedly until the filling is finished. Wherein:
EVI (N): step N, calculating the opening degree, PLS, of an indoor unit expansion valve EVI;
EVI (N + 1): calculating the opening degree, PLS, of the indoor unit expansion valve EVI in the (N + 1) th step;
EVI0: the system presets the initial value of the expansion valve of the indoor unit, wherein the value range is (0, 2000), PLS;
SH: the superheat degree of an outlet of a heat exchanger of the indoor unit is SH = Tg-TL, namely the difference value of the outlet temperature of the evaporator and the evaporation temperature, K;
SHO: the target value of the superheat degree of the outlet of the heat exchanger of the indoor unit is within the range of (0-30), preferably (5-15), and K;
m: a first superheat degree preset value, constant, m is more than 0, and the value range of m is preferably (0, 10);
n: the second preset superheat value, constant, n < 0, preferably n is in the range of (-10,0).
In some embodiments of the present application, the control valve is an electronic expansion valve 710, and the electronic expansion valve 710 can not only control the on/off of the refrigerant filling passage, but also control the refrigerant filling speed. The specific control mode is as follows:
when the difference between the suction superheat degree of the compressor 100 and the preset suction superheat degree is detected to be larger than a first preset suction superheat degree, the controller controls the opening of the electronic expansion valve 710 to be increased;
when the difference between the suction superheat of the compressor 100 and the preset suction superheat is smaller than a second preset suction superheat value, the controller controls the opening of the electronic expansion valve 710 to be reduced.
After the automatic charging is started, initial value control is performed on the electronic expansion valve 710EVC, then the air suction superheat Tsh (the difference value of the air suction temperature Ts of the compressor 100 and the saturation temperature Tsc corresponding to the system low pressure Ps, and Tsh = Ts-Tsc) is determined, if the Tsh is larger than the preset air suction superheat TshO by a certain value, the opening degree of the EVC is increased, if the Tsh is smaller than the preset air suction superheat TshO by a certain value, the opening degree of the EVC is decreased, the judgment is repeatedly performed, the adjustment is performed until the charging is completed, and after the charging is completed, the EVC =0 PLS. Wherein:
EVC (N): step N, EVC opening, PLS;
EVC (N + 1): EVC opening degree in the (N + 1) th step, PLS;
EVC0: the system presets an EVC initial value and PLS, and experiments confirm that the values of the units with different capacities are different;
tsh: suction superheat degree, K;
tsh O: presetting the suction superheat degree, wherein the value range is (0-20), preferably (1-5), and K;
g: the first preset suction superheat degree, constant, g is more than 0, and the preferable value range of g is (0, 5), K;
h: the second preset suction superheat, constant, h < 0, preferably h is in the range of (-5, 0), K.
In some embodiments of the present application, the control valve is a stop valve 720 disposed on the refrigerant filling channel, and a throttle capillary tube 800 is further disposed on the refrigerant filling channel.
Or the stop valve 720 may be a switch valve connected to the refrigerant filling tank 600, and the switch valve needs to be manually opened according to a prompt when filling is started, and needs to be manually closed according to the prompt after filling is completed.
In some embodiments of the present application, the controller is configured to:
and when detecting that the variation of the supercooling degree of the outlet of the outdoor heat exchanger 300 in unit time is smaller than a first preset value, prompting to replace the refrigerant filling tank 600.
In the filling process, whether the refrigerant tank needs to be replaced is judged according to the variation of the supercooling degree SC of the outlet of the heat exchanger in unit time; if the variable quantity is less than the first preset value, the refrigerant filling tank 600 replacement condition is met, the system can prompt the replacement of the refrigerant filling tank 600 instruction, and after the refrigerant tank is manually replaced, the system continues to fill the refrigerant.
The air conditioning device in the embodiment can control the superheat degree of the outlet of the indoor heat exchanger 400 in real time when the refrigerant is filled, so that the superheat degree of the outlet of the indoor heat exchanger 400 is kept in a preset superheat degree interval range, the influence of superheat degree change on the accuracy of the refrigerant filling process is avoided, and the refrigerant filling precision is ensured;
moreover, in the air conditioning device in this embodiment, when the refrigerant is filled, the ambient temperature is added and corrected, the target supercooling degree corresponding to the ambient temperature is calculated by combining the optimal target supercooling degree, the amount of the refrigerant required to be filled is determined by the target supercooling degree, the ambient temperature is added and corrected, the problem that the refrigerant filling precision has errors due to the influence of severe working conditions is avoided, and the refrigerant filling precision is further ensured.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. An air conditioning device comprising:
the refrigerant loop is formed by connecting a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger and a gas-liquid separator through refrigerant pipelines;
the refrigerant filling tank is connected between the compressor and the gas-liquid separator through a refrigerant filling passage;
the control valve is arranged on the refrigerant filling channel and used for controlling the on-off of the refrigerant filling channel;
a controller configured to:
when the indoor temperature is detected to be within an indoor preset temperature interval range, the outdoor temperature is detected to be within an outdoor preset temperature interval range and the air conditioning device is in a stable state, the air conditioning device is controlled to start a refrigeration running mode, and the control valve is controlled to be opened for refrigerant charging;
when the variation of the exhaust temperature of the compressor is detected to be within the preset exhaust interval range, judging that the system is stable;
acquiring an outdoor environment temperature correction value according to the outdoor environment temperature and the indoor environment temperature, and acquiring a target supercooling degree by combining the outdoor environment temperature correction and the optimal target supercooling degree;
the target supercooling degree is calculated by the following formula:
SC o ＝SC standard +T rev ；
wherein the outdoor environment temperature correction value is calculated by the following formula:
in the formula: SCo is a target supercooling degree, K;
SC standard the optimal target supercooling degree under the standard refrigeration working condition under the current online scheme is obtained by experiments, and the value of the supercooling degree is determined by the volume ratio of the indoor unit and the outdoor unit, K;
the corrected value of the outdoor environment temperature is set as T rev It is calculated by the following formula:
T rev ＝a+b*T aave +C*T iave +d*T qave *T iave ；
wherein Taave is the outdoor ambient temperature, DEG C; tiave is the indoor ambient temperature, DEG C, a, b, c, d are constants;
controlling the superheat degree of the indoor heat exchanger in a preset superheat degree interval range in the charging process;
and when the obtained supercooling degree of the outlet of the outdoor heat exchanger is greater than the target supercooling degree, controlling the control valve to act so as to close the refrigerant filling channel.
2. The air conditioning device according to claim 1, characterized in that:
the control valve is an electronic expansion valve, and when the difference between the suction superheat degree of the compressor and the preset suction superheat degree is larger than a first preset suction superheat degree value, the controller controls the opening of the electronic expansion valve to be increased;
and when the difference between the suction superheat degree of the compressor and the preset suction superheat degree is smaller than a second preset suction superheat degree, the controller controls the opening of the electronic expansion valve to be reduced.
3. The air conditioning device according to claim 1, characterized in that:
the control valve is a stop valve arranged on the refrigerant filling channel, and a throttling capillary tube is further arranged on the refrigerant filling channel.
4. The air conditioning device according to claim 1, characterized in that: the controller is configured to:
and prompting to replace the refrigerant filling tank when detecting that the variation of the supercooling degree of the outlet of the outdoor heat exchanger in the preset time is smaller than a first preset value.
5. The air conditioning device according to claim 1, characterized in that: the control mode for controlling the superheat degree of the indoor heat exchanger within the range of the preset superheat degree interval is as follows:
acquiring the superheat degree of an outlet of an indoor heat exchanger of the air conditioning device;
and adjusting the opening degree of an expansion valve of the indoor unit corresponding to the regulator according to the superheat degree of the outlet of the indoor heat exchanger so as to control the superheat degree of the outlet of the indoor heat exchanger to be within the range of a preset superheat degree.
6. The air conditioning device according to claim 5, characterized in that: and when the difference between the outlet superheat degree of the indoor heat exchanger and the preset superheat degree is smaller than a second superheat degree preset value, controlling the opening degree of the indoor expansion valve to be increased.
7. The air conditioning device according to claim 1, characterized in that: the supercooling degree of the outlet of the outdoor heat exchanger is obtained by the difference between the saturation temperature corresponding to the high pressure of the system and the temperature of the outlet of the outdoor heat exchanger.
8. The air conditioning device according to claim 1, characterized in that: the air conditioning device comprises a filling port, and the refrigerant filling tank is communicated with the filling port through a connecting hose.
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| CN202111241577.8A CN113883690B (en) | 2021-10-25 | 2021-10-25 | Air conditioning apparatus |
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| WO2023083040A1 (en) * | 2021-11-11 | 2023-05-19 | 青岛海信日立空调系统有限公司 | Air conditioner |
| CN114165845A (en) * | 2021-11-26 | 2022-03-11 | 青岛海信日立空调系统有限公司 | Multi-split air conditioner |
| CN114413429B (en) * | 2022-01-26 | 2023-05-30 | 青岛海信日立空调系统有限公司 | Air conditioning system |
| CN114811868B (en) * | 2022-02-14 | 2023-09-08 | 宁波奥克斯电气股份有限公司 | Control method and device for electronic expansion valve and multi-split system |
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