CN111306852A - Air conditioning system for preventing heat exchanger from frosting and control method thereof - Google Patents
Air conditioning system for preventing heat exchanger from frosting and control method thereof Download PDFInfo
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- CN111306852A CN111306852A CN202010120883.5A CN202010120883A CN111306852A CN 111306852 A CN111306852 A CN 111306852A CN 202010120883 A CN202010120883 A CN 202010120883A CN 111306852 A CN111306852 A CN 111306852A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 157
- 238000010438 heat treatment Methods 0.000 claims abstract description 80
- 239000003507 refrigerant Substances 0.000 claims abstract description 75
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000004590 computer program Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000003213 activating effect Effects 0.000 claims 3
- 238000001704 evaporation Methods 0.000 abstract description 20
- 230000008020 evaporation Effects 0.000 abstract description 18
- 238000005057 refrigeration Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 6
- 239000000243 solution Substances 0.000 description 6
- 238000005485 electric heating Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000009491 slugging Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/43—Defrosting; Preventing freezing of indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
-
- 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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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioning system for preventing a heat exchanger from frosting and a control method thereof. Wherein, this air conditioning system includes vapour and liquid separator, still includes: a heating device; the heating device is arranged outside the gas-liquid separator and used for heating the refrigerant in the gas-liquid separator when the temperature of the indoor heat exchanger pipeline is lower than a first preset temperature and lasts for a first preset time. According to the invention, when the air conditioner is in a low-temperature refrigeration state and the evaporation temperature of the indoor heat exchanger is lower than the preset temperature, the evaporation temperature of the indoor heat exchanger can be effectively increased by starting the heating device, the frosting of the indoor heat exchanger can be effectively prevented, and the refrigeration effect of the air conditioner is ensured.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system for preventing a heat exchanger from frosting and a control method thereof.
Background
The air conditioning equipment can adjust the air temperature, humidity, flow speed, cleanliness and the like in a certain space. In actual use, the air conditioning equipment will be exposed to various working environments. There is a working state of low temperature refrigeration, i.e. the temperature of outdoor environment is low, and there is a heat source in the room, which needs to refrigerate the room. Because the environment temperature of the outdoor heat exchanger is low, the pressure of a cooling medium in the system is too low, and further the evaporation temperature of the evaporation side is too low. When the refrigeration is carried out at low temperature, the indoor heat exchanger is used as an evaporation side, and if the evaporation temperature is too low and is lower than 0 ℃, the indoor heat exchanger is easy to frost, so that the whole machine cannot work normally.
Aiming at the problem that an indoor heat exchanger of an air conditioning system in the prior art frosts during low-temperature refrigeration operation, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides an air conditioning system for preventing a heat exchanger from frosting and a control method thereof, which aim to solve the problem that an indoor heat exchanger in the prior art frosts during low-temperature refrigeration operation.
In order to solve the above technical problem, the present invention provides an air conditioning system for preventing a heat exchanger from frosting, wherein the system comprises:
comprises a gas-liquid separator and also comprises: a heating device;
the heating device is arranged outside the gas-liquid separator and used for heating the refrigerant in the gas-liquid separator when the temperature of the indoor heat exchanger pipeline is lower than a first preset temperature and lasts for a first preset time, so that the liquid refrigerant in the gas-liquid separator is converted into a gaseous refrigerant.
Further, the gas-liquid separator comprises an upper space and a lower space, the upper space and the lower space are communicated through a pipeline, and a first valve is arranged on the pipeline and used for controlling liquid refrigerant in the upper space to flow into the lower space;
the heating device is coated in the lower space of the gas-liquid separator and used for heating the refrigerant in the lower space of the gas-liquid separator.
Further, a pressure sensor is arranged in the lower space of the gas-liquid separator and used for detecting the pressure value in the lower space when the heating device works.
Furthermore, a second valve is arranged on a pipeline between the first exhaust end of the lower space and the suction end of the compressor and used for preventing liquid refrigerant in the heating device from flowing into the compressor.
Further, a pressure balance pipeline is arranged between the second exhaust end of the lower space and the exhaust end of the upper space, and a third valve is further arranged on the pressure balance pipeline and is used for opening when the pressure value in the lower space is larger than a preset pressure value, so that the gaseous refrigerant in the lower space is exhausted.
Furthermore, the first exhaust end of the lower space of the gas-liquid separator is communicated with an enthalpy injection pipeline of the compressor through an enthalpy increasing valve and is used for increasing enthalpy.
The invention also provides an air conditioning system control method, which is applied to the air conditioning system and is characterized by comprising the following steps:
detecting the temperature of an indoor heat exchanger pipeline;
and if the temperature of the indoor heat exchanger pipeline is lower than a first preset temperature and lasts for a first preset time, triggering a heating device of the gas-liquid separator to work.
Furthermore, the indoor heat exchanger pipeline is an inlet end pipeline of the indoor heat exchanger.
Further, before detecting the temperature of the indoor heat exchanger pipeline, the method further comprises the following steps:
monitoring the temperature of the outdoor environment;
if the temperature of the outdoor environment is lower than a preset threshold value, detecting the temperature of the indoor heat exchanger pipeline;
if the temperature of the outdoor environment is higher than or equal to a preset threshold value, the temperature of the outdoor environment is continuously monitored.
Further, while triggering the heating device of the gas-liquid separator to operate, the method further comprises:
controlling the first valve to be opened so as to control the liquid refrigerant to flow from the upper space of the gas-liquid separator to the lower space;
the gas-liquid separator comprises an upper space and a lower space, and the first valve is arranged on a pipeline between the upper space and the lower space of the gas-liquid separator.
Further, after triggering the heating device of the gas-liquid separator to work, the method further comprises the following steps:
and controlling a second valve to be opened, wherein the gas-liquid separator comprises an upper space and a lower space, and the second valve is arranged between a first exhaust end of the lower space and a suction end of the compressor.
Further, after triggering the heating device of the gas-liquid separator to work, the method further comprises the following steps:
detecting the temperature of an indoor heat exchanger pipeline;
and if the temperature of the indoor heat exchanger pipeline is higher than a second preset temperature and lasts for a second preset time, triggering the heating device to stop working, wherein the second preset temperature is higher than the first preset temperature.
Further, after triggering the heating device of the gas-liquid separator to work, the method further comprises the following steps:
detecting the pressure value in the lower space of the gas-liquid separator;
when the pressure value in the lower space of the gas-liquid separator is greater than the preset pressure value, controlling the opening of a third valve;
wherein the gas-liquid separator includes an upper space and a lower space, and the third valve is disposed on a pipeline between a second discharge end of the lower space and a discharge end of the upper space.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the above-mentioned method.
The invention also provides an air conditioner, which comprises the air conditioning system for preventing the heat exchanger from frosting, or the control method of the air conditioning system.
By applying the technical scheme of the invention, the heating device is arranged at the bottom of the gas-liquid separator between the indoor heat exchanger and the compressor, when the air conditioner is in a low-temperature refrigeration state, the temperature of the pipeline of the indoor heat exchanger is lower than the preset temperature, and the preset time is continued, the evaporation temperature of the indoor heat exchanger can be effectively increased by starting the heating device, the frosting of the indoor heat exchanger can be effectively prevented, and the refrigeration effect of the air conditioner is ensured.
Drawings
Fig. 1 is a structural view of an air conditioning system according to an embodiment of the present invention;
fig. 2 is a structural view of an air conditioning system according to another embodiment of the present invention;
fig. 3 is a structural view of an air conditioning system according to still another embodiment of the present invention;
fig. 4 is a refrigerant flow diagram in a gas-liquid separator and a heating device of an air conditioning system according to an embodiment of the present invention;
fig. 5 is a flowchart of an air conditioning system control method according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe valves in embodiments of the present invention, the valves should not be limited to these terms. These terms are only used to distinguish between valves disposed at different locations in an air conditioning system. For example, a first valve may also be referred to as a second valve, and similarly, a second valve may also be referred to as a first valve, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
An embodiment provides an air conditioning system for preventing a heat exchanger from frosting, fig. 1 is a structural diagram of an air conditioning system according to an embodiment of the present invention, and as shown in fig. 1, the air conditioning system includes: the air-conditioning system comprises a compressor 11, an outdoor heat exchanger 12, an indoor heat exchanger 13 and a gas-liquid separator 14, wherein the inlet end of the gas-liquid separator 14 is connected with the indoor heat exchanger 13, the outlet end of the gas-liquid separator 14 is connected with the compressor 11, when the air-conditioning system operates at low temperature, high-temperature and high-pressure gas exhausted from the compressor 11 enters the outdoor heat exchanger 12 to be condensed and release heat, is changed into liquid, is exhausted from the outdoor heat exchanger, is throttled and then enters the indoor heat exchanger 13 to be evaporated and absorb heat in the indoor heat exchanger 13 to realize refrigeration, a gas-liquid mixed refrigerant formed after evaporation in the indoor heat exchanger 13 enters the gas-liquid separator 14, after the refrigerant enters the gas-liquid separator, part of the gas-state refrigerant is exhausted from the outlet end of the gas-liquid separator 14 and enters a gas suction port of the compressor, the pressure of the refrigerant in the system is too low, and further the evaporation temperature of the indoor heat exchanger 13 is too low, so that the indoor heat exchanger frosts, meanwhile, the refrigerant evaporated into a gas state is reduced, the liquid refrigerant is relatively more, and the liquid refrigerant collected by the gas-liquid separator 14 is increased.
In order to increase the pressure of the indoor heat exchanger 13 and prevent the evaporation temperature from being too low, the air conditioning system of this embodiment is provided with a heating device 15, where the heating device 15 is disposed on the gas-liquid separator 14, and is configured to heat the liquid refrigerant in the gas-liquid separator 14 when the temperature of the indoor heat exchanger 13 pipeline is lower than a first preset temperature and lasts for a first preset time, so as to convert the liquid refrigerant in the gas-liquid separator into a gaseous refrigerant, where the indoor heat exchanger pipeline is an inlet end pipeline or an outlet end pipeline of the indoor heat exchanger 13, and is preferably at an inlet end pipeline temperature.
It should be noted that the heating device 15 may be configured to heat and evaporate the liquid refrigerant in the gas-liquid separator 14, and the arrangement and position of the heating device 15 may be various, for example, the heating device is disposed on the outer surface of the gas-liquid separator 14, or disposed inside the gas-liquid separator 14, or disposed on a pipeline at an inlet or an outlet of the gas-liquid separator 14, so as to avoid occupying an inner space of the gas-liquid separator 14 and reduce the amount of the liquid refrigerant stored in the gas-liquid separator 14, and the preferred embodiment is disposed outside the gas-liquid separator 14, or employs a heating wire, which is in an annular structure and is disposed on an inner wall of a cavity of the gas-liquid separator 14 to directly heat the refrigerant.
In order to further achieve a better heating effect, it is preferable that the heating device 15 is disposed at the bottom of the gas-liquid separator 14, since the heating device is covered outside the gas-liquid separator 14 and the liquid refrigerant is deposited at the bottom of the gas-liquid separator due to gravity.
The air conditioning system of this embodiment, through set up heating device on vapour and liquid separator 14 between indoor heat exchanger 13 and compressor 11, is in low temperature refrigeration state at the air conditioner, leads to the temperature of indoor heat exchanger pipeline to be less than preset the temperature, and when lasting the preset time, can be through opening heating device effectively improves indoor heat exchanger's evaporating temperature, can prevent indoor heat exchanger frosting effectively, guarantees the refrigeration effect of air conditioner.
Example 2
In order to achieve the purpose of determining whether an indoor heat exchanger 13 is frosted according to a temperature, as shown in fig. 2, based on the above embodiment, the air conditioning system further includes: and the temperature sensor 16 is arranged on the pipeline at the outlet end of the indoor heat exchanger 13 and used for detecting the temperature of the refrigerant in the pipeline at the outlet end of the indoor heat exchanger 13 so as to judge whether the indoor heat exchanger frosts according to the temperature of the refrigerant.
In order to separately control the separation of the liquid refrigerant and the heating of the liquid refrigerant, as shown in fig. 2, on the basis of the above embodiment, the gas-liquid separator 14 is divided into an upper space 141 and a lower space 142, the upper space 141 includes an inlet end, an exhaust end and a drainage end, the lower space includes a liquid inlet end, a first exhaust end and a second exhaust end, the inlet end of the upper space 141 is connected to the indoor heat exchanger 13, the drainage end of the upper space 141 is communicated with the liquid inlet end of the lower space 142 through a pipeline, the exhaust end of the upper space 141 is connected to the compressor 11, and the heating device 15 is wrapped in the lower space 142 of the gas-liquid separator and is used for heating the refrigerant in the lower space 142 of the gas-liquid separator; a first valve 17 is disposed on a pipeline between the liquid discharging end of the upper space 141 and the liquid inlet end of the lower space 142, and is configured to adjust a flow rate of the liquid refrigerant flowing from the upper space 141 into the lower space 142.
In order to control the pressure in the lower space 142 of the gas-liquid separator 14, as shown in fig. 2, in addition to the above embodiment, a pressure sensor 18 is further disposed in the lower space 142 of the gas-liquid separator 14 for detecting the pressure in the lower space 142 when the heating device 15 is operated, so that the liquid refrigerant may be rapidly evaporated into a gaseous state after the heating device is turned on, thereby increasing the pressure in the lower space 142 of the gas-liquid separator.
After the liquid refrigerant flows into the lower space 142 through the pipeline, the lower space 142 heats the refrigerant, if the flow rate of the liquid refrigerant is fast, the heating power of the lower space 142 is low, and the liquid refrigerant is discharged from the first gas discharge end of the lower space 142 and enters the compressor 11 without being vaporized to be gaseous, so as to cause liquid slugging of the compressor 11, in order to avoid this phenomenon, as shown in fig. 2, on the basis of the above embodiment, a second valve 19 is further disposed between the first gas discharge end of the lower space 142 and the gas suction end of the compressor 11, so that the flow rate of the liquid refrigerant is fast, the power of the heating device is low, the evaporation rate is low, or the liquid refrigerant is closed when the liquid refrigerant is in the lower space 142 and the heating component of the lower space 142 is not opened, so as to prevent the liquid refrigerant from entering the compressor 11.
Since the liquid refrigerant is rapidly evaporated to a gaseous state when the heating device 15 is in operation, the pressure in the lower space 142 may be very high, and the problem of the excessive pressure cannot be solved only by the second valve 19, in order to further release the pressure in the lower space 142, as shown in fig. 2, on the basis of the above embodiment, the second gas discharge end of the lower space 142 is communicated with the gas discharge end of the upper space 141 through the pressure balance pipeline, the pressure balance pipeline is further provided with a third valve 110, which is used for opening when the pressure value in the lower space 142 is greater than the preset pressure value, so that the gaseous refrigerant in the lower space 142 is merged with the gaseous refrigerant discharged from the discharge end of the upper space 141 through the third valve 110 and then returned to the compressor, thereby reducing the pressure in the lower space 142, and the pressure in the lower space 142 is maintained within a normal range in cooperation with the second valve 19.
In order to realize the effect of enthalpy increase, the first exhaust end of the lower space 142 of the gas-liquid separator is further communicated with the enthalpy injection pipeline of the compressor 11 through a pipeline for enthalpy increase, and the pipeline is further provided with an enthalpy increase valve 111 for controlling whether the gaseous refrigerant discharged from the exhaust end of the gas-liquid separator enters the enthalpy injection pipeline.
Example 3
In this embodiment, another air conditioning system for preventing frosting of a heat exchanger is provided, and fig. 3 is a structural diagram of an air conditioning system according to another embodiment of the present invention, as shown in fig. 3, the air conditioning system includes: the compressor 31, the outdoor heat exchanger 32, the indoor heat exchanger 33, and the gas-liquid separator 34 (i.e., the upper space 141 in the above-mentioned embodiment), wherein the inlet end of the gas-liquid separator 34 is connected to the indoor heat exchanger 33, the exhaust end of the gas-liquid separator 34 is connected to the compressor 31, a heating tank 35 (i.e., the second space 142 in the above-mentioned embodiment) is additionally arranged below the gas-liquid separator 34, an electric heating element 36 (i.e., the heating device 15 in the above-mentioned embodiment) is arranged outside the heating tank to heat the refrigerant in the heating tank 35, a pipeline is connected between the heating tank 35 and the liquid discharge end of the gas-liquid separator 34, a liquid inlet valve 37 is arranged on the pipeline to supplement the refrigerant in the heating tank 35, a pipeline is connected between the heating tank 35 and the exhaust end of the gas-liquid separator. The heating tank 35 is connected with the air inlet of the compressor 31 through a pipeline, and an exhaust valve 39 is arranged on the pipeline.
When the air conditioning system operates at low temperature, high-temperature and high-pressure gas discharged from the compressor 31 enters the outdoor heat exchanger 32 through the oil-gas separator 310 and the check valve 311 to be condensed and release heat, then the condensed and released heat is changed into liquid, then the liquid leaves the outdoor heat exchanger 32 and enters the indoor heat exchanger 33, the refrigerant is throttled in the indoor heat exchanger 33 to be changed into low-temperature and low-pressure liquid, and the low-temperature and low-pressure liquid is evaporated and absorbs heat in the indoor heat exchanger 33 to realize refrigeration.
Fig. 4 is a refrigerant flow diagram of the gas-liquid separator and the heating device of the air conditioning system according to the embodiment of the present invention, and as shown in fig. 4, the refrigerant evaporated in the indoor heat exchanger enters the gas-liquid separator 34. After the refrigerant enters the gas-liquid separator 34, part of the gaseous refrigerant directly comes out from the gas-liquid separator 34 and enters the air suction end of the compressor 31, and the other part of the liquid refrigerant enters the heating tank 35 through the liquid inlet valve 37, is heated by the heating tank 35 to become gaseous refrigerant and enters the air suction end of the compressor 31. Through this structure, can effectively promote system's evaporation side pressure, prevent that evaporation temperature from crossing excessively for indoor heat exchanger 33 frosts. And the frequency of the outer fan can be reduced simultaneously, and the situation that the high-pressure side pressure is too low and further the low-pressure side pressure is influenced is prevented.
For whether or not the electric heating part 36 is turned on: when the temperature of the indoor unit pipe is detected to be lower than A ℃ continuously for Xmin, the liquid inlet valve 37, the exhaust valve 39 and the electric heating part 36 are opened; when the indoor unit tube temperature is detected to be greater than B ℃ continuously for Ymin, the liquid inlet valve 37, the gas outlet valve 39 and the electric heating part 36 are closed, specifically, in one embodiment, X, Y may be set to 1, a may be set to 0, and B may be set to 5.
In the air conditioning system of the embodiment, the heating tank is additionally arranged below the gas-liquid separator, and the electric heating part is arranged outside the heating tank. When the whole machine is detected to be in a low-temperature refrigeration state, the refrigerant in the gas-liquid separator enters the heating tank to be heated, the evaporation temperature is increased, and the indoor evaporator is prevented from frosting.
Example 4
The present embodiment provides an air conditioning system control method for preventing a heat exchanger from frosting, which is applied to the air conditioning system, and fig. 5 is a flowchart of the air conditioning system control method implemented according to the present invention, as shown in fig. 5, the method includes:
s101, detecting the temperature of an indoor heat exchanger pipeline; wherein, the indoor heat exchanger pipeline is an inlet pipeline or an outlet pipeline of the indoor heat exchanger, if the temperature of the outdoor environment is lower, the evaporating temperature of the indoor heat exchanger is lower, which can cause the temperature of the indoor heat exchanger pipeline to be reduced, therefore, by detecting the temperature of the indoor heat exchanger pipeline, whether the air conditioning system is in a low-temperature refrigeration state can be judged, in addition, as the refrigerant enters the indoor heat exchanger and exchanges heat, when the refrigerant is discharged from the indoor heat exchanger, the temperature can be increased, therefore, the temperature of the outlet pipeline of the indoor heat exchanger is higher than the temperature of the inlet pipeline, and the temperature of the outlet pipeline can be influenced by the air volume of the fan and the indoor temperature, therefore, the temperature of the inlet pipeline can be detected, which can truly reflect the state of the air conditioner, therefore, the indoor heat exchanger pipeline is preferably the, the temperature of the pipeline can be detected by a temperature sensor arranged on the pipeline at the inlet end of the indoor heat exchanger.
And S102, if the temperature of the pipeline is lower than a first preset temperature and lasts for a first preset time, triggering a heating device of the gas-liquid separator to work, so that the liquid refrigerant in the gas-liquid separator is converted into a gaseous refrigerant and then discharged.
In specific implementation, if it is detected that the temperature of the indoor heat exchanger pipeline is lower than a first preset temperature for a period of time, it is indicated that the indoor heat exchanger is frosted, at this time, the heating device should be started to heat the liquid refrigerant in the gas-liquid separator so as to increase the pressure in the system and raise the evaporation temperature of the indoor heat exchanger, wherein the first preset temperature is set according to an experimental value or an empirical value, and the set method is that when the temperature of the indoor heat exchanger pipeline is lower than a certain temperature, the indoor heat exchanger is frosted, and the temperature is set as the first preset temperature.
In addition, in order to more accurately judge the state of the air conditioning system, the temperature of the outdoor environment can be detected before the temperature of the indoor heat exchanger pipeline is detected, if the temperature of the outdoor environment is lower than a preset threshold value, the temperature of the indoor heat exchanger pipeline is continuously detected, if the temperature of the outdoor environment is higher than or equal to the preset threshold value, the temperature of the outdoor environment is continuously detected until the temperature of the outdoor environment is lower than the preset threshold value, and then the temperature of the indoor heat exchanger pipeline is detected, wherein the preset threshold value can be zero degrees centigrade.
In a specific implementation, in order to control the liquid refrigerant flowing out of the upper space of the gas-liquid separator to flow into the lower space, the method further includes: and controlling a first valve arranged on a pipeline between the upper space and the lower space of the gas-liquid separator to be opened so as to control the liquid refrigerant in the upper space of the gas-liquid separator to flow into the lower space.
After the liquid refrigerant flows into the lower space 142 through the pipeline, the lower space 142 heats the refrigerant, if the flow rate of the liquid refrigerant is fast, the heating power of the lower space 142 is small, and the liquid refrigerant is discharged from the first gas discharge end of the lower space 142 to the compressor 11 without being evaporated into a gas state, so as to cause liquid slugging of the compressor 11, in order to avoid this phenomenon, a second valve 19 is further disposed between the first gas discharge end of the lower space 142 and the gas suction end of the compressor 11, so that when the flow rate of the liquid refrigerant is fast, the power of the heating device is small, the evaporation rate is low, or the second valve 19 is closed under the condition that the liquid refrigerant is in the lower space 142 and the heating component of the lower space 142 is not opened, so that if the heating device of the gas-liquid separator is triggered to work, the second valve 19 is in a closed state, the opening of the second valve is controlled after the heating device triggering the gas-liquid separator works.
Because the heating device does not need to be started when the air conditioning system normally operates, in order to control the heating device to be closed when the air conditioner normally operates and avoid energy waste, after the heating device of the gas-liquid separator is controlled to be started, the method further comprises the following steps: the temperature of the indoor heat exchanger pipeline is detected, the temperature of the pipeline is detected through the temperature sensor, and the temperature of the indoor heat exchanger pipeline is detected by the temperature sensor in real time; if the temperature of the pipeline is higher than a second preset temperature and lasts for a second preset time, it is indicated that the indoor heat exchanger is not frosted, and the air conditioner normally operates, the heating device is triggered to stop working, wherein the second preset temperature is higher than the first preset temperature, the second preset temperature is set according to an experimental value or an empirical value, the set method is that when the temperature of the pipeline of the indoor heat exchanger is higher than a certain temperature, the indoor heat exchanger is determined not to be frosted, and the temperature is set as the second preset temperature.
After the heating device is turned on, the liquid refrigerant may be rapidly evaporated into a gaseous state, and the pressure inside the space below the gas-liquid separator may be increased, and in order to prevent the pressure inside the space below the gas-liquid separator from being too high, the method further includes: detecting the pressure value in the lower space of the gas-liquid separator; and when the pressure value in the lower space of the gas-liquid separator is greater than the preset pressure value, controlling a third valve arranged on a pipeline between the second exhaust end of the lower space of the gas-liquid separator and the exhaust end of the upper space of the gas-liquid separator to open so that the gaseous refrigerant in the lower space passes through the third valve and then is merged with the gaseous refrigerant exhausted from the exhaust end of the upper space and then returns to the compressor, and reducing the pressure in the lower space of the gas-liquid separator.
According to the control method of the air conditioning system, the running state of the air conditioner is judged by detecting the discharge of the outlet end of the indoor heat exchanger, when the evaporation temperature of the indoor heat exchanger is lower than the set temperature, the evaporation temperature of the indoor heat exchanger can be effectively improved by opening the heating device, the frosting of the indoor heat exchanger can be effectively prevented, and the refrigeration effect of the air conditioner is ensured.
Example 5
The present embodiments provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described method.
Example 6
The embodiment provides an air conditioner, which comprises the air conditioning system for preventing the heat exchanger from frosting or the control method of the air conditioning system.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (15)
1. An air conditioning system comprising a gas-liquid separator, characterized in that the system further comprises: a heating device;
the heating device is arranged outside the gas-liquid separator and used for heating the refrigerant in the gas-liquid separator when the temperature of the indoor heat exchanger pipeline is lower than a first preset temperature and lasts for a first preset time.
2. The system of claim 1,
the gas-liquid separator comprises an upper space and a lower space, the upper space is communicated with the lower space through a pipeline, and a first valve is arranged on the pipeline and used for controlling liquid refrigerant in the upper space to flow into the lower space;
the heating device is coated in the lower space of the gas-liquid separator and used for heating the refrigerant in the lower space of the gas-liquid separator.
3. The system according to claim 2, wherein a pressure sensor is provided in the lower space of the gas-liquid separator for detecting a pressure value in the lower space when the heating device is operated.
4. The system of claim 3, wherein a second valve is disposed in a conduit between the first discharge end of the lower space and the suction end of the compressor for preventing the refrigerant in the heating device from flowing into the compressor.
5. The system as claimed in claim 2, wherein a pressure balance pipeline is disposed between the second exhaust end of the lower space and the exhaust end of the upper space, and a third valve is disposed on the pressure balance pipeline and is configured to open when a pressure value in the lower space is greater than a preset pressure value, so as to discharge the gaseous refrigerant in the lower space.
6. The system of claim 5, wherein the first discharge end of the lower space of the gas-liquid separator is further communicated with an enthalpy injection pipeline of the compressor through an enthalpy increasing valve for increasing enthalpy.
7. An air conditioning system control method applied to the air conditioning system according to any one of claims 1 to 6, characterized by comprising:
detecting the temperature of an indoor heat exchanger pipeline;
and if the temperature of the indoor heat exchanger pipeline is lower than a first preset temperature and lasts for a first preset time, triggering a heating device of the gas-liquid separator to work.
8. The method of claim 7 wherein the indoor heat exchanger tube is an inlet end tube of the indoor heat exchanger.
9. The method of claim 7, wherein prior to detecting the temperature of the indoor heat exchanger tube, the method further comprises:
monitoring the temperature of the outdoor environment;
if the temperature of the outdoor environment is lower than a preset threshold value, detecting the temperature of an indoor heat exchanger pipeline;
and if the temperature of the outdoor environment is higher than or equal to a preset threshold value, continuously monitoring the temperature of the outdoor environment.
10. The method of claim 7, wherein the method further comprises, while triggering operation of a heating device of the gas-liquid separator:
controlling the first valve to be opened so as to control the liquid refrigerant to flow from the upper space of the gas-liquid separator to the lower space;
the gas-liquid separator comprises an upper space and a lower space, and the first valve is arranged on a pipeline between the upper space and the lower space of the gas-liquid separator.
11. The method of claim 7, wherein after activating the heating device of the gas-liquid separator, the method further comprises:
and controlling a second valve to be opened, wherein the gas-liquid separator comprises an upper space and a lower space, and the second valve is arranged between a first exhaust end of the lower space and a suction end of the compressor.
12. The method of claim 7, wherein after activating the heating device of the gas-liquid separator, the method further comprises:
detecting the temperature of an indoor heat exchanger pipeline;
and if the temperature of the pipeline is higher than a second preset temperature and lasts for a second preset time, triggering the heating device to stop working, wherein the second preset temperature is higher than the first preset temperature.
13. The method of claim 7, wherein after activating the heating device of the gas-liquid separator, the method further comprises:
detecting the pressure value in the lower space of the gas-liquid separator;
when the pressure value in the lower space of the gas-liquid separator is greater than the preset pressure value, controlling the opening of a third valve;
wherein the gas-liquid separator includes an upper space and a lower space, and the third valve is disposed on a pipeline between a second discharge end of the lower space and a discharge end of the upper space.
14. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method of any one of claims 7 to 13.
15. An air conditioner comprising the system of any one of claims 1 to 6, or the method of any one of claims 7 to 13.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010120883.5A CN111306852A (en) | 2020-02-26 | 2020-02-26 | Air conditioning system for preventing heat exchanger from frosting and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010120883.5A CN111306852A (en) | 2020-02-26 | 2020-02-26 | Air conditioning system for preventing heat exchanger from frosting and control method thereof |
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Application publication date: 20200619 |