CN112444004A - Air conditioning device - Google Patents

Air conditioning device Download PDF

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Publication number
CN112444004A
CN112444004A CN202011373392.8A CN202011373392A CN112444004A CN 112444004 A CN112444004 A CN 112444004A CN 202011373392 A CN202011373392 A CN 202011373392A CN 112444004 A CN112444004 A CN 112444004A
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China
Prior art keywords
defrosting
preset
temperature
liquid pipe
compressor
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Granted
Application number
CN202011373392.8A
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Chinese (zh)
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CN112444004B (en
Inventor
张恒
邓玉平
夏兴祥
陈林
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Priority to CN202011373392.8A priority Critical patent/CN112444004B/en
Publication of CN112444004A publication Critical patent/CN112444004A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0251—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units being defrosted alternately
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/029—Control issues
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioning device, comprising: a refrigerant circulation circuit; a high-low pressure bypass circuit connected between the air outlet side of the compressor and the air return side of the compressor, and provided with a first bypass control element at the upper part; a first temperature detection element for detecting a liquid tube side temperature; a second temperature detecting element for detecting an outdoor temperature; an outdoor fan; the controller is configured to: when the temperature value detected by the second temperature detection element is larger than a first preset temperature, the continuous heating time is larger than the first preset time, and the liquid pipe side temperature is smaller than the first liquid pipe preset temperature, the compressor reduces the frequency to a first preset frequency, the high-low pressure bypass loop is conducted, the throttling element is controlled to a first preset opening degree, the outdoor fan reaches a first preset rotating speed, and the four-way valve is controlled according to the detected defrosting time and the liquid pipe side temperature. The invention solves the problems of high power consumption of the compressor and larger power consumption in the defrosting process of the existing air conditioner.

Description

Air conditioning device
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
When the air conditioning device heats in winter, the outdoor heat exchanger is used as an evaporator, when the surface temperature of the evaporator is lower than zero and lower than the dew point temperature of wet air, frosting can occur, the heat resistance and the wind resistance of the heat exchanger can be increased, when the frost amount reaches a certain degree, the heat exchange effect of the heat exchanger can be seriously influenced, and defrosting operation is needed. The most common defrosting methods of the current air conditioning system are as follows: the four-way valve is used for reversing defrosting and hot gas bypass defrosting.
When the reversing defrosting system meets the defrosting condition, the four-way valve reverses, the indoor unit serves as an evaporator, and the outdoor unit serves as a condenser to achieve defrosting operation. The heat sources of the defrosting mode comprise two parts, namely power consumption of the compressor and heat absorption from the indoor, the defrosting reliability is high, but the fluctuation of the indoor temperature is large, the user comfort is influenced, and the compressor needs to run at high frequency during defrosting, so that the defrosting power consumption is large.
When the hot gas bypass defrosting system meets the defrosting condition, the defrosting electromagnetic valve is opened, the exhaust of the compressor is directly led to the outdoor heat exchanger for defrosting, the indoor unit is not reversed and still keeps a high-pressure state in the hot gas bypass defrosting process, the indoor temperature fluctuation is relatively small in the defrosting process, the capacity of the indoor unit is quickly recovered after defrosting, the user comfort is relatively good, but the heat source of the defrosting mode is only the power consumption of the compressor, on one hand, the defrosting reliability is poor, the defrosting system is only suitable for being used under the working condition of less frost amount, and on the other hand, the power consumption of the compressor is increased in the high-frequency.
Disclosure of Invention
For compressor consumption height during solving among the prior art defrosting, defrosting process power consumption is great, and partial operating mode defrosting speed is comparatively slow, and indoor side temperature fluctuation is big, and the travelling comfort is relatively poor. The invention provides an air conditioning device, which utilizes heat in outdoor medium-temperature air to defrost, can remove all or part of frost by consuming very small electric energy (mainly fan power consumption and the like), can improve defrosting speed and reduce defrosting power consumption while ensuring defrosting reliability by combining with traditional defrosting schemes such as reversing defrosting or hot-gas bypass defrosting, and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
the present invention provides an air conditioning apparatus, including:
a refrigerant circulation loop formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a compressor, a throttling element and a four-way valve;
the high-low pressure bypass circuit is connected between the gas outlet side of the compressor and the gas return side of the compressor, and a first bypass control element is arranged on the high-low pressure bypass circuit;
the first temperature detection element is arranged on the liquid pipe side of the outdoor heat exchanger and used for detecting the temperature of the liquid pipe side;
a second temperature detecting element for detecting an outdoor temperature;
an outdoor fan disposed at the side of the outdoor heat exchanger;
the controller is configured to: when the temperature value detected by the second temperature detection element is larger than a first preset temperature, the continuous heating time is larger than the first preset time, and the liquid pipe side temperature is smaller than the first liquid pipe preset temperature, the compressor is controlled to reduce the frequency to a first preset frequency, the high-low pressure bypass loop is controlled to be conducted, the opening of the throttling element is controlled to a first preset opening, the outdoor fan is controlled to a first preset rotating speed, and the four-way valve is controlled according to the detected defrosting time and the liquid pipe side temperature value.
In some embodiments of the present application: the controller is configured to: when the defrosting time is detected to be more than or equal to the first preset defrosting time or the defrosting time is detected to be more than or equal to the second preset defrosting time and the liquid pipe side temperature value is more than or equal to the first preset value, the sizes of the liquid pipe side temperature value and the defrosting threshold value are further detected and judged, and when the liquid pipe side temperature value is detected to be less than the defrosting threshold value, the four-way valve is controlled to change direction.
In some embodiments of the present application: the defrosting device also comprises a bypass defrosting branch which is connected to a refrigerant pipeline between the air outlet side of the compressor and the outdoor heat exchanger and the indoor heat exchanger, and a second bypass control element is arranged on the bypass defrosting branch.
In some embodiments of the present application: the controller is further configured to: when the temperature value detected by the second temperature detection element is larger than a first preset temperature, the continuous heating time is larger than the first preset time, and the liquid pipe side temperature is smaller than the first liquid pipe preset temperature, the compressor is controlled to reduce the frequency to a first preset frequency, the high-low pressure bypass loop is conducted and controlled to open the throttling element to a first preset open degree, the outdoor fan is controlled to a first preset rotating speed, and the on-off of the bypass defrosting branch is controlled according to the detected defrosting time and the liquid pipe side temperature value.
In some embodiments of the present application: the controller is configured to: when the defrosting time is detected to be more than or equal to a first preset defrosting time, or the defrosting time is detected to be more than or equal to a second preset defrosting time and the liquid pipe side temperature value is more than or equal to a first preset value, the sizes of the liquid pipe side temperature value and the defrosting threshold value are further detected and judged, and when the liquid pipe side temperature value is detected to be less than the defrosting threshold value, the bypass defrosting branch circuit is controlled to be conducted.
An air conditioning device comprising:
a refrigerant circulation loop formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a compressor, a throttling element and a four-way valve;
the high-low pressure bypass circuit is connected between the gas outlet side of the compressor and the gas return side of the compressor, and a first bypass control element is arranged on the high-low pressure bypass circuit;
the first temperature detection element is arranged on the liquid pipe side of the outdoor heat exchanger and used for detecting the temperature of the liquid pipe side;
a second temperature detecting element for detecting an outdoor temperature;
an outdoor fan disposed at the side of the outdoor heat exchanger;
the controller is configured to: when the temperature value that acquires the detection of second temperature detection element is greater than first preset temperature, and the continuous heating time is greater than first preset time and liquid pipe side temperature is less than first liquid pipe and predetermines the temperature, control the compressor falls the frequency to first preset frequency, control high low pressure bypass circuit switches on, controls throttling element aperture to first preset aperture, control outdoor fan carries out the air can the defrosting to first preset rotational speed to according to the defrosting time that detects and the stop that liquid pipe side temperature value control air can the defrosting.
In some embodiments of the present application: the controller is further configured to: and detecting the defrosting times of the air energy and the preset defrosting times, and controlling the four-way valve to change the direction when the defrosting times of the air energy are detected to be greater than the preset defrosting times.
In some embodiments of the present application: the defrosting device also comprises a bypass defrosting branch which is connected to a refrigerant pipeline between the air outlet side of the compressor and the outdoor heat exchanger and the indoor heat exchanger, and a second bypass control element is arranged on the bypass defrosting branch.
In some embodiments of the present application: the controller is further configured to: and detecting the defrosting times of the air energy and the preset defrosting times, and controlling the bypass defrosting branch to be conducted when the defrosting times of the air energy are detected to be greater than the preset defrosting times.
In some embodiments of the present application: the controller is configured to: after the bypass branch is controlled to be conducted, the defrosting times of the air energy stored in the bypass branch are cleared.
Compared with the prior art, the technical scheme of the invention has the following technical effects:
when the air conditioning device provided by the invention is used, the heat in outdoor medium-temperature air is utilized to defrost, all or part of frost can be removed by consuming very little electric energy, and the defrosting speed can be increased and the defrosting power consumption can be reduced while the defrosting reliability is ensured by combining with traditional defrosting schemes such as reversing defrosting or hot gas bypass defrosting.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an air conditioning apparatus according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of an air conditioner according to the present invention;
FIG. 3 is a control flow chart of the air conditioning apparatus according to the first embodiment of the present invention;
FIG. 4 is a control flow chart of a second embodiment of the air conditioner according to the present invention;
FIG. 5 is a control flow chart corresponding to the third embodiment of the air conditioner according to the present invention;
fig. 6 is a control flowchart corresponding to the fourth embodiment of the air conditioning apparatus according to 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 be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly 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.
The first embodiment is as follows:
an embodiment of an air conditioning device is provided, including:
a refrigerant circulation loop formed by connecting the outdoor heat exchanger 100, the indoor heat exchanger 200, the compressor 300, the throttling element 400 and the four-way valve 500;
specifically, 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 300 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 300. 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 air-conditioning outdoor unit refers to a portion including the compressor 300 of the refrigeration cycle and includes an outdoor heat exchanger, the air-conditioning indoor unit includes an indoor heat exchanger, and an expansion valve may be provided in the air-conditioning 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.
And a high-low pressure bypass circuit 600 connected between the discharge side of the compressor 300 and the return side of the compressor 300, wherein the high-low pressure bypass circuit 600 is provided with a first bypass control element 610.
In some embodiments, the first bypass control element 610 is a first bypass control valve connected to the high-low pressure bypass circuit 600 to control the opening and closing of the high-low pressure bypass circuit 600.
After the high-low pressure bypass circuit 600 is conducted, most of the refrigerant discharged from the air outlet side of the compressor 300 flows through the high-low pressure bypass circuit 600 and flows back to the inside of the compressor 300 through the air return side of the compressor 300, only a very small amount of refrigerant flows through the outdoor heat exchanger 100 and the indoor heat exchanger 200, the whole compressor 300 is equal to an unloading mode, the pressure of the outdoor heat exchanger 100 side is increased, the temperature of the refrigerant at the outdoor heat exchanger 100 side is increased, the melting of frost at the outdoor heat exchanger 100 side is accelerated, and the defrosting efficiency is improved.
A first temperature detection element, disposed on a liquid tube side of the outdoor heat exchanger 100, for detecting a temperature of the liquid tube side, and for convenience of description, a temperature value detected by the first temperature detection element is set as Te in this embodiment;
and the second temperature detection element is used for detecting the outdoor temperature, and the temperature value detected by the second temperature detection element is Ta.
And an outdoor fan 700 provided at the side of the outdoor heat exchanger 100 for blowing away frost on the outdoor heat exchanger 100 when rotated, so that the outdoor heat exchanger 100 can be defrosted by air.
The controller is configured to: when the temperature value detected by the second temperature detection element is greater than a first preset temperature, the continuous heating time is greater than the first preset time, and the liquid pipe side temperature is less than the first liquid pipe preset temperature, the compressor 300 is controlled to reduce the frequency to a first preset frequency, the high-low pressure bypass circuit 600 is controlled to be switched on, the opening degree of the throttling element 400 is controlled to a first preset opening degree, the outdoor fan 700 is controlled to a first preset rotating speed, and the four-way valve 500 is controlled according to the detected defrosting time and the liquid pipe side temperature value.
Specifically, the controller is configured to: when the defrosting time is detected to be more than or equal to the first preset defrosting time, or the defrosting time is detected to be more than or equal to the second preset defrosting time and the liquid pipe side temperature value is more than or equal to the first preset value, the sizes of the liquid pipe side temperature value and the defrosting threshold value are further detected and judged, and when the liquid pipe side temperature value is detected to be less than the defrosting threshold value, the four-way valve 500 is controlled to change over.
The first preset time corresponds to a target time t1o for the continuous heating operation of the entire air conditioning device, which is: 20-120min, preferably t1o =30 min, the first liquid tube preset temperature is teo, corresponding to a low temperature preset value of the liquid tube. teo = Ta-a, a being a constant greater than 0, preferably a = 10-15.
In addition, in the flowchart of this embodiment, whether the defrosting condition is satisfied is determined, the corresponding defrosting condition is that the temperature value detected by the second temperature detecting element is greater than the first preset temperature, the continuous heating time of the air conditioner is greater than the first preset time, and the liquid pipe side temperature value is less than the first liquid pipe preset temperature. When the air conditioning device meets the above conditions, the whole device is controlled to defrost the air energy.
For convenience of description, in this embodiment, the first preset frequency of the compressor 300 is H1o, and is a set frequency of the compressor 300 corresponding to the defrosting operation of the air energy, and the value may be 0 or H1min — H1max, where H1min, H1max are the lowest frequency and the highest frequency allowed by the compressor 300, and when H1=0, the compressor 300 is stopped, and in order to reduce the power consumption of the compressor 300 during the defrosting operation of the air energy and ensure the high-pressure and high-temperature state of the indoor unit, preferably H1o = H1 min.
EVO is the opening degree of the throttling element 400, EVOo is a first preset opening degree corresponding to the throttling element 400 when air can be defrosted, and the value of EVOmin-EVOmax can be set, and the larger EVOo is, the more refrigerant flows in the outdoor unit, the more the defrosting speed is affected, therefore, EVOo = EVOmin is preferable.
FAN is the rotating speed when the air can be defrosted, FANo is the first preset rotating speed when the air can be defrosted, the value of FANmin-FANmax can be FANmin, FANmax are the lowest rotating speed and the highest rotating speed allowed by the FAN, and FANo = FANmax is preferable for improving the defrosting effect.
t is the defrosting time, and to is the longest defrosting time, i.e. the first preset defrosting time, and the value thereof can be 1-6 min, and the longer the defrosting time, the more thorough the defrosting, but the more the indoor thermal comfort is affected, so the preferred to = 2-4 min.
tmin is the minimum defrosting time when the defrosting judgment condition is that Te is larger than or equal to lambda, namely the second preset defrosting time, and the defrosting is prevented from immediately exiting due to the fact that the system is unstable right at the beginning of defrosting, and the value of tmin can be 30s-60 s.
λ ≧ 0, the larger λ the more thorough defrosting, but the more impact on indoor thermal comfort, so λ =1-2 ℃ is preferred.
The defrosting limit value is delta, delta is more than or equal to lambda is more than or equal to 0, delta is used for representing the limit of whether defrosting is complete, the greater delta is, the better defrosting reliability is, but repeated defrosting is easy to cause long defrosting time and heat waste, and the like, and delta is preferably 4-6 ℃.
In the embodiment of the air conditioning device, when defrosting is performed, the controller first detects an ambient temperature, preferably, when the ambient temperature is detected to be higher than a first preset temperature, the air energy defrosting mode is started, the first preset temperature is higher than 0 ℃, the controller controls the outdoor fan 700 to be started to a first preset rotating speed, the compressor 300 stops or operates at a low frequency, the throttling element 400 is started to a first preset opening degree, and the first bypass control element 610 is controlled to be opened, so that the high-low pressure bypass circuit 600 is conducted, the started fan performs a "defrosting" operation, defrosting is performed by using low-grade heat contained in the air, complete defrosting or partial defrosting can be performed by using a very small amount of electric quantity, and meanwhile, in order to ensure defrosting reliability, further defrosting residual quantity determination needs to be performed after the defrosting operation, that is, the liquid pipe side temperature value and the defrosting limit value are determined, when the liquid pipe side temperature value is greater than the defrosting threshold value, then steerable whole device pushes out the defrosting mode, heats the operation, when frost is not removed completely, when the liquid pipe side temperature value is less than the defrosting threshold value promptly, then control to open reverse defrosting mode, control cross valve 500 promptly and commutate, because the air can defrost and has been removed most frost, the time of reverse defrosting will reduce greatly. The whole defrosting process is low in power consumption, short in reverse defrosting time, short in indoor heat pumping time, and greatly reduced in indoor temperature fluctuation compared with pure reverse defrosting.
And when the reverse defrosting meets the defrosting exit condition, the controller controls the exit of the reverse defrosting mode.
The exit condition of the reverse defrosting is also to detect whether the defrosting time exceeds a first reverse preset defrosting time or whether the defrosting time is greater than a second reverse preset defrosting time and the temperature of the liquid pipe side is greater than a second preset value, and if so, the controller exits the reverse defrosting mode.
Example two:
an embodiment of an air conditioning device is provided, including:
a refrigerant circulation loop formed by connecting the outdoor heat exchanger 100, the indoor heat exchanger 200, the compressor 300, the throttling element 400 and the four-way valve 500;
a high-low pressure bypass circuit 600 connected between the air outlet side of the compressor 300 and the air return side of the compressor 300, the high-low pressure bypass circuit 600 being provided with a first bypass control element 610;
a first temperature detection element, disposed on a liquid tube side of the outdoor heat exchanger 100, for detecting a temperature of the liquid tube side, and for convenience of description, a temperature value detected by the first temperature detection element is set as Te in this embodiment;
and the second temperature detection element is used for detecting the outdoor temperature, and the temperature value detected by the second temperature detection element is Ta.
An outdoor fan 700 disposed at the side of the outdoor heat exchanger 100;
for convenience of description, in this embodiment, the first preset frequency of the compressor 300 is H1o, and is a set frequency of the compressor 300 corresponding to the defrosting operation of the air energy, and the value may be 0 or H1min — H1max, where H1min, H1max are the lowest frequency and the highest frequency allowed by the compressor 300, and when H1=0, the compressor 300 is stopped, and in order to reduce the power consumption of the compressor 300 during the defrosting operation of the air energy and ensure the high-pressure and high-temperature state of the indoor unit, preferably H1o = H1 min.
EVO is the opening degree of the throttling element 400, EVOo is a first preset opening degree corresponding to the throttling element 400 when air can be defrosted, and the value of EVOmin-EVOmax can be set, and the larger EVOo is, the more refrigerant flows in the outdoor unit, the more the defrosting speed is affected, therefore, EVOo = EVOmin is preferable.
FAN is the rotating speed of the outdoor FAN 700 when the air can be defrosted, FANo is the first preset rotating speed when the air can be defrosted, and the value of FANmin-FANmax can be FANmin, FANmax is the lowest rotating speed and the highest rotating speed allowed by the FAN, and FANo = FANmax is preferable for improving the defrosting effect.
t is the defrosting time, and to is the longest defrosting time, i.e. the first preset defrosting time, and the value thereof can be 1-6 min, and the longer the defrosting time, the more thorough the defrosting, but the more the indoor thermal comfort is affected, so the preferred to = 2-4 min.
tmin is the minimum defrosting time when the defrosting judgment condition is that Te is larger than or equal to lambda, namely the second preset defrosting time, and the defrosting is prevented from immediately exiting due to the fact that the system is unstable right at the beginning of defrosting, and the value of tmin can be 30s-60 s.
λ ≧ 0, the larger λ the more thorough defrosting, but the more impact on indoor thermal comfort, so λ =1-2 ℃ is preferred.
The defrosting limit value is delta, delta is more than or equal to lambda is more than or equal to 0, delta is used for representing the limit of whether defrosting is complete, the greater delta is, the better defrosting reliability is, but repeated defrosting is easy to cause long defrosting time and heat waste, and the like, and delta is preferably 4-6 ℃.
This embodiment still includes compared with embodiment one: and a bypass defrosting branch 800 connected to a refrigerant pipe between the outlet side of the compressor 300 and the outdoor heat exchanger 100 and the indoor heat exchanger 200, wherein the bypass defrosting branch 800 is provided with a second bypass control element 810. In some embodiments, the second bypass control element 810 is selected to be a second bypass control valve, and when in use, the second bypass control valve can be controlled to open or close the bypass defrost branch 800.
Because bypass defrosting branch 800 that sets up, when using, this embodiment can switch on bypass defrosting branch 800 and realize the bypass defrosting to outdoor heat exchanger 100, specifically, when bypass defrosting branch 800 switches on, compressor 300's exhaust bypass enters into outdoor heat exchanger 100 in the entrance of outdoor heat exchanger 100 and releases heat and defrost, can keep the high pressure throughout in the indoor set in the defrosting process, can prevent that the indoor set from absorbing heat from indoor and causing indoor temperature dip on the one hand, on the other hand need not to preheat the indoor set and can realize the air-out after the defrosting, indoor set air-out interval is shorter after the defrosting.
However, since the heat of the hot gas bypass defrosting is only from the power consumption of the compressor 300, the defrosting time is relatively long, the defrosting reliability is weak, and the hot gas bypass defrosting method is only suitable for the condition of low frost amount.
In some embodiments of the present application: the controller is further configured to: when the temperature value detected by the second temperature detection element is greater than a first preset temperature, the continuous heating time is greater than the first preset time, and the liquid pipe side temperature is less than the first liquid pipe preset temperature, the compressor 300 is controlled to reduce the frequency to a first preset frequency, the high-low pressure bypass circuit 600 is controlled to be switched on, the opening of the throttling element 400 is controlled to a first preset opening, the outdoor fan 700 is controlled to a first preset rotating speed, and the on-off of the bypass defrosting branch 800 is controlled according to the detected defrosting time and the liquid pipe side temperature value.
Specifically, the method comprises the following steps: when the defrosting time is detected to be greater than or equal to the first preset defrosting time, or the defrosting time is detected to be greater than or equal to the second preset defrosting time and the liquid pipe side temperature value is greater than or equal to the first preset value, the sizes of the liquid pipe side temperature value and the defrosting threshold value are further detected and judged, and when the liquid pipe side temperature value is detected to be less than the defrosting threshold value, the bypass defrosting branch 800 is controlled to be conducted.
In the embodiment of the air conditioning device, when defrosting is performed, the controller first detects an ambient temperature, preferably, when the ambient temperature is detected to be higher than a first preset temperature, the air energy defrosting mode is started, the first preset temperature is higher than 0 ℃, the controller controls the outdoor fan 700 to be started to a first preset rotating speed, the compressor 300 stops or operates at a low frequency, the throttling element 400 is started to a first preset opening degree, and the first bypass control element 610 is controlled to be opened, so that the high-low pressure bypass circuit 600 is conducted, the started fan performs a "defrosting" operation, defrosting is performed by using low-grade heat contained in the air, complete defrosting or partial defrosting can be performed by using a very small amount of electric quantity, and meanwhile, in order to ensure defrosting reliability, further defrosting residual quantity determination needs to be performed after the defrosting operation, that is, the liquid pipe side temperature value and the defrosting limit value are determined, when the temperature value of the liquid pipe side is larger than the defrosting threshold value, the whole device can be controlled to push out the defrosting mode to perform heating operation.
When the frost is not completely removed, that is, when it is detected that the temperature value on the liquid pipe side is smaller than the defrosting threshold value, the bypass defrosting mode is controlled to be started, the first bypass control element 610 is closed, and the second bypass control element 810 is opened, so that the refrigerant on the exhaust side of the compressor 300 enters the outdoor heat exchanger 100, and the outdoor heat exchanger 100 is directly defrosted.
The air conditioning device in the embodiment can remove most frost on the surface of the outdoor heat exchanger 100 in advance while consuming little electric energy, and can reduce the influence on the fluctuation of indoor temperature in the defrosting process after being combined with hot-gas bypass defrosting, so that the indoor is always kept in a high-pressure state, the reliability of hot-gas bypass defrosting is improved, the defrosting time is shortened, and the power consumption during defrosting is saved.
And when the bypass defrosting meets the defrosting exit condition, the controller controls the bypass defrosting mode to exit.
The exit condition of the bypass defrosting is also to detect whether the defrosting time exceeds the first bypass preset defrosting time or whether the defrosting time is greater than the second bypass preset defrosting time and the liquid pipe side temperature is greater than a third preset value, and if so, the controller exits the bypass defrosting mode.
Example three:
an embodiment of an air conditioning device is provided, comprising:
a refrigerant circulation loop formed by connecting the outdoor heat exchanger 100, the indoor heat exchanger 200, the compressor 300, the throttling element 400 and the four-way valve 500;
a high-low pressure bypass circuit 600 connected between the air outlet side of the compressor 300 and the air return side of the compressor 300, the high-low pressure bypass circuit 600 being provided with a first bypass control element 610;
a first temperature detection element provided on a liquid tube side of the outdoor heat exchanger 100 for detecting a liquid tube side temperature;
a second temperature detecting element for detecting an outdoor temperature;
an outdoor fan 700 disposed at the side of the outdoor heat exchanger 100;
the controller is configured to: when the temperature value detected by the second temperature detection element is larger than a first preset temperature, the continuous heating time is longer than the first preset time, and the liquid pipe side temperature is smaller than the first liquid pipe preset temperature, the compressor 300 is controlled to reduce the frequency to a first preset frequency to control the high-low pressure bypass circuit 600 to be switched on and controlled to open the throttling element 400 to a first preset opening to control the outdoor fan 700 to a first preset rotating speed to defrost air and control the stop of the defrosting air according to the detected defrosting time and the liquid pipe side temperature value.
Specifically, when the defrosting time is detected to be greater than or equal to a third preset defrosting time, or the defrosting time is detected to be greater than or equal to a second preset defrosting time and the liquid pipe side temperature value is greater than or equal to a defrosting threshold value, the air is controlled to defrost and exit the defrosting mode.
For convenience of description, in this embodiment, the first preset frequency of the compressor 300 is H1o, and is a set frequency of the compressor 300 corresponding to the defrosting operation of the air energy, and the value may be 0 or H1min — H1max, where H1min, H1max are the lowest frequency and the highest frequency allowed by the compressor 300, and when H1=0, the compressor 300 is stopped, and in order to reduce the power consumption of the compressor 300 during the defrosting operation of the air energy and ensure the high-pressure and high-temperature state of the indoor unit, preferably H1o = H1 min.
EVO is the opening degree of the throttling element 400, EVOo is a first preset opening degree corresponding to the throttling element 400 when air can be defrosted, and the value of EVOmin-EVOmax can be set, and the larger EVOo is, the more refrigerant flows in the outdoor unit, the more the defrosting speed is affected, therefore, EVOo = EVOmin is preferable.
FAN is the rotating speed when the air can be defrosted, FANo is the first preset rotating speed when the air can be defrosted, the value of FANmin-FANmax can be FANmin, FANmax are the lowest rotating speed and the highest rotating speed allowed by the FAN, and FANo = FANmax is preferable for improving the defrosting effect.
t is defrosting time, tmin is the lowest defrosting time when the defrosting judgment condition is that Te is larger than or equal to lambda, namely the second preset defrosting time, and the defrosting is prevented from immediately exiting due to the fact that the system is unstable right at the beginning of defrosting, and the value of tmin can be 30s-60 s.
λ ≧ 0, the larger λ the more thorough defrosting, but the more impact on indoor thermal comfort, so λ =1-2 ℃ is preferred.
The defrosting limit value is delta, delta is more than or equal to lambda is more than or equal to 0, delta is used for representing the limit of whether defrosting is complete, the greater delta is, the better defrosting reliability is, but repeated defrosting is easy to cause long defrosting time and heat waste, and the like, and delta is preferably 4-6 ℃.
t1 is the air energy defrosting exit time, i.e. the third preset defrosting time, because the scheme only adopts the air energy defrosting to defrost in a partial period, the third preset defrosting time is more than or equal to the first preset defrosting time, i.e. t1 is more than or equal to, and the preferable 9min is more than or equal to t1 is more than or equal to 6 min.
In this embodiment, the outdoor fan 700, the compressor 300, the throttling element 400, and the first bypass control element 610 are turned on to perform defrosting when the defrosting condition is satisfied, and the air energy defrosting is controlled to stop to perform primary air energy defrosting when the defrosting exit condition is satisfied according to the defrosting time and the liquid-pipe-side temperature value.
The number of times the air can defrost corresponds to: and n is the number of times of defrosting operation of the air energy.
In some embodiments of the present application: the controller is further configured to: and detecting the number of times of air energy defrosting and the preset number of times of defrosting, and controlling the four-way valve 500 to change over when detecting that the number of times of air energy defrosting is greater than the preset number of times of defrosting.
The controller is configured to: after the four-way valve 500 is controlled to perform reversing defrosting, the number of times of defrosting of the air energy stored in the four-way valve is cleared, and the number is counted again. When the air energy defrosting times reach the preset defrosting times again, the four-way valve 500 is controlled again to reverse for reverse defrosting, and the defrosting is performed continuously in sequence.
no is the preset defrosting times of the air energy, when the air energy is used for defrosting and continuously runs no times, no is more than or equal to 1, and after no = 2-4 is optimized, reverse defrosting is forcibly carried out once for ensuring defrosting reliability.
According to the scheme, when defrosting is carried out, air can be used for defrosting for no period at first, defrosting power consumption is reduced, but in order to guarantee defrosting reliability, reverse defrosting is forced to be carried out for one time after the air can be used for defrosting for no period, and reliability is guaranteed.
Example four:
an embodiment of an air conditioning device is provided, including:
a refrigerant circulation loop formed by connecting the outdoor heat exchanger 100, the indoor heat exchanger 200, the compressor 300, the throttling element 400 and the four-way valve 500;
a high-low pressure bypass circuit 600 connected between the air outlet side of the compressor 300 and the air return side of the compressor 300, the high-low pressure bypass circuit 600 being provided with a first bypass control element 610;
a first temperature detection element provided on a liquid tube side of the outdoor heat exchanger 100 for detecting a liquid tube side temperature;
a second temperature detecting element for detecting an outdoor temperature;
an outdoor fan 700 disposed at the side of the outdoor heat exchanger 100;
and a bypass defrosting branch 800 connected to a refrigerant pipe between the outlet side of the compressor 300 and the outdoor heat exchanger 100 and the indoor heat exchanger 200, wherein the bypass defrosting branch 800 is provided with a second bypass control element 810.
Specifically, when the defrosting time is detected to be greater than or equal to a third preset defrosting time, or the defrosting time is detected to be greater than or equal to a second preset defrosting time and the liquid pipe side temperature value is greater than or equal to a defrosting threshold value, the air is controlled to defrost and exit the defrosting mode.
In this embodiment, the outdoor fan 700, the compressor 300, the throttling element 400, and the first bypass control element 610 are turned on to perform defrosting when the defrosting condition is satisfied, and the air energy defrosting is controlled to stop to perform primary air energy defrosting when the defrosting exit condition is satisfied according to the defrosting time and the liquid-pipe-side temperature value.
The number of times the air can defrost corresponds to: and n is the number of times of defrosting operation of the air energy.
In some embodiments of the present application: the controller is further configured to: and detecting the number of times of air energy defrosting and the preset number of times of defrosting, and controlling the bypass defrosting branch 800 to be conducted when the detected number of times of air energy defrosting is greater than the preset number of times of defrosting.
no is the preset defrosting times of the air energy, when the air energy is defrosted and continuously runs for no times, no is more than or equal to 1, and after no = 2-4 is optimized, the bypass defrosting is forcibly carried out once for ensuring the defrosting reliability.
t1 is the air energy defrosting exit time condition, i.e. the third preset defrosting time, because the scheme only adopts the air energy defrosting to defrost in a part of the period, the third preset defrosting time is more than or equal to the first preset defrosting time, i.e. t1 is more than or equal to, and the preferable 9min is more than or equal to t1 is more than or equal to 6 min.
In some embodiments of the present application: the controller is configured to: after the bypass branch is controlled to be conducted, the defrosting times of the air energy stored in the bypass branch are cleared, and the air energy is counted again. When the air energy defrosting times reach the preset defrosting times again, the four-way valve 500 is controlled to reverse again to perform bypass defrosting, and the air energy defrosting times are circulated continuously in sequence.
According to the scheme, when defrosting is carried out, air can be used for defrosting for no period at first, defrosting power consumption is reduced, but in order to guarantee defrosting reliability, one-time bypass defrosting is forced to be carried out after the air can be used for defrosting for no period, and reliability is guaranteed.
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 (10)

1. An air conditioning device comprising:
a refrigerant circulation loop formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a compressor, a throttling element and a four-way valve;
the high-low pressure bypass circuit is connected between the gas outlet side of the compressor and the gas return side of the compressor, and a first bypass control element is arranged on the high-low pressure bypass circuit;
the first temperature detection element is arranged on the liquid pipe side of the outdoor heat exchanger and used for detecting the temperature of the liquid pipe side;
a second temperature detecting element for detecting an outdoor temperature;
an outdoor fan disposed at the side of the outdoor heat exchanger;
the controller is configured to: when the temperature value that acquires the detection of second temperature detection element is greater than first preset temperature, when the continuous heating time is greater than first preset time and liquid pipe side temperature is less than first liquid pipe preset temperature, control the compressor falls the frequency to first preset frequency, control high low pressure bypass circuit switches on, controls throttling element aperture to first preset aperture, control outdoor fan to first preset rotational speed to control the cross valve according to defrosting time that detects and liquid pipe side temperature value.
2. The air conditioning device according to claim 1, characterized in that: the controller is configured to: when the defrosting time is detected to be more than or equal to the first preset defrosting time or the defrosting time is detected to be more than or equal to the second preset defrosting time and the liquid pipe side temperature value is more than or equal to the first preset value, the sizes of the liquid pipe side temperature value and the defrosting threshold value are further detected and judged, and when the liquid pipe side temperature value is detected to be less than the defrosting threshold value, the four-way valve is controlled to change direction.
3. The air conditioning device according to claim 1, characterized in that: the defrosting device also comprises a bypass defrosting branch which is connected to a refrigerant pipeline between the air outlet side of the compressor and the outdoor heat exchanger and the indoor heat exchanger, and a second bypass control element is arranged on the bypass defrosting branch.
4. The air conditioning unit of claim 3, wherein the controller is further configured to: when the temperature value detected by the second temperature detection element is larger than a first preset temperature, the continuous heating time is larger than the first preset time, and the liquid pipe side temperature is smaller than the first liquid pipe preset temperature, the compressor is controlled to reduce the frequency to a first preset frequency, the high-low pressure bypass loop is conducted and controlled to open the throttling element to a first preset open degree, the outdoor fan is controlled to a first preset rotating speed, and the on-off of the bypass defrosting branch is controlled according to the detected defrosting time and the liquid pipe side temperature value.
5. The air conditioning unit of claim 4, wherein the controller is configured to: when the defrosting time is detected to be more than or equal to a first preset defrosting time, or the defrosting time is detected to be more than or equal to a second preset defrosting time and the liquid pipe side temperature value is more than or equal to a first preset value, the sizes of the liquid pipe side temperature value and the defrosting threshold value are further detected and judged, and when the liquid pipe side temperature value is detected to be less than the defrosting threshold value, the bypass defrosting branch circuit is controlled to be conducted.
6. An air conditioning device comprising:
a refrigerant circulation loop formed by connecting an outdoor heat exchanger, an indoor heat exchanger, a compressor, a throttling element and a four-way valve;
the high-low pressure bypass circuit is connected between the gas outlet side of the compressor and the gas return side of the compressor, and a first bypass control element is arranged on the high-low pressure bypass circuit;
the first temperature detection element is arranged on the liquid pipe side of the outdoor heat exchanger and used for detecting the temperature of the liquid pipe side;
a second temperature detecting element for detecting an outdoor temperature;
an outdoor fan disposed at the side of the outdoor heat exchanger;
the controller is configured to: when the temperature value that acquires the detection of second temperature detection element is greater than first preset temperature, heat time in succession and be greater than first preset time and liquid pipe side temperature and be less than first liquid pipe when presetting the temperature, control the compressor falls the frequency to first preset frequency, control high low pressure bypass circuit switches on, controls throttling element aperture to first preset aperture, control outdoor fan carries out the air can the defrosting to first preset rotational speed to according to the defrosting time that detects and the stop that liquid pipe side temperature value control air can the defrosting.
7. The air conditioning unit of claim 1, wherein the controller is further configured to: and detecting the defrosting times of the air energy and the preset defrosting times, and controlling the four-way valve to change the direction when the defrosting times of the air energy are detected to be greater than the preset defrosting times.
8. The air conditioning device according to claim 6, characterized in that: the defrosting device also comprises a bypass defrosting branch which is connected to a refrigerant pipeline between the air outlet side of the compressor and the outdoor heat exchanger and the indoor heat exchanger, and a second bypass control element is arranged on the bypass defrosting branch.
9. The air conditioning unit of claim 3, wherein the controller is further configured to: and detecting the defrosting times of the air energy and the preset defrosting times, and controlling the bypass defrosting branch to be conducted when the defrosting times of the air energy are detected to be greater than the preset defrosting times.
10. The air conditioning unit of claim 3, wherein the controller is configured to: after the bypass branch is controlled to be conducted, the defrosting times of the air energy stored in the bypass branch are cleared.
CN202011373392.8A 2020-11-30 2020-11-30 Air conditioning device Active CN112444004B (en)

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JP2007051825A (en) * 2005-08-18 2007-03-01 Matsushita Electric Ind Co Ltd Air-conditioner
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