CN113587264A - Refrigerant temperature control method, multi-split air conditioning system and readable storage medium - Google Patents
Refrigerant temperature control method, multi-split air conditioning system and readable storage medium Download PDFInfo
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- CN113587264A CN113587264A CN202010370228.5A CN202010370228A CN113587264A CN 113587264 A CN113587264 A CN 113587264A CN 202010370228 A CN202010370228 A CN 202010370228A CN 113587264 A CN113587264 A CN 113587264A
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/20—Electric components for separate outdoor units
- F24F1/24—Cooling of electric components
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/14—Heat exchangers specially adapted for separate outdoor units
- F24F1/16—Arrangement or mounting thereof
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/26—Refrigerant piping
- F24F1/30—Refrigerant piping for use inside the separate outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- General Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a refrigerant temperature control method, a multi-split air-conditioning system and a readable storage medium, wherein the multi-split air-conditioning system comprises a cooling pipeline for cooling an electric control device of an outdoor unit of an air conditioner, and comprises a plate heat exchanger provided with a first refrigerant flow path and a second refrigerant flow path, two ends of the first refrigerant flow path are respectively connected with the cooling pipeline and an indoor heat exchanger, one end of the second refrigerant flow path is communicated with a pipeline between the indoor heat exchanger and the plate heat exchanger through a liquid taking pipe, the other end of the second refrigerant flow path is communicated with an inlet of a gas-liquid separator through a return pipe, a throttling device is arranged on the liquid taking pipe, and when the multi-split air-conditioning system is in a heating mode, if the refrigerant temperature of the cooling pipeline is detected to be greater than or equal to a first preset temperature, the opening degree of the throttling device is increased so as to reduce the refrigerant temperature. The invention avoids the outdoor unit electric control device from stopping working due to poor heat dissipation effect entering a high-temperature protection state, and avoids the outdoor unit electric control device from being in a fault state due to poor heat dissipation effect.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a refrigerant temperature control method, a multi-split air conditioning system and a readable storage medium.
Background
At present, in order to enable an outdoor unit electric control device in an air conditioner to have a good heat dissipation effect, a refrigerant heat dissipation technology is often adopted in a multi-split air conditioning system. When the air conditioner is in heating operation and the temperature of an indoor room of the air conditioner reaches a set temperature, the compressor of the air conditioner stops operating; when the indoor room temperature is lower than the set temperature, the compressor is restarted, the air conditioner unit is possibly in a state of frequent start and stop, in the process of frequent start and stop of the unit, the heat productivity of the outdoor unit electric control device is large due to the large starting power of the compressor, and in addition, the unit executes cold-proof operation in the starting stage, the temperature of a refrigerant for radiating the outdoor unit electric control device is high, and finally the outdoor unit electric control device is subjected to high-temperature protection or is in a fault state due to poor radiating effect.
Therefore, in the multi-split air conditioner system, the outdoor unit electric control device stops working due to poor heat dissipation effect and enters a high-temperature protection state.
Disclosure of Invention
The invention mainly aims to provide a refrigerant temperature control method, a multi-split air conditioner system and a readable storage medium, and aims to solve the technical problem that an outdoor unit electric control device in the existing multi-split air conditioner system stops working due to the fact that the outdoor unit electric control device enters a high-temperature protection state due to poor heat dissipation effect.
In order to achieve the purpose, the invention provides a method for controlling the temperature of a refrigerant, which is applied to a multi-split air-conditioning system, wherein the multi-split air-conditioning system comprises a plate heat exchanger and a cooling pipeline, the cooling pipeline is used for cooling an electric control device of an outdoor unit of an air conditioner, a refrigerant flow path is arranged in the plate heat exchanger, a first refrigerant flow path and a second refrigerant flow path are arranged in the plate heat exchanger, two ends of the first refrigerant flow path are respectively connected with the cooling pipeline and an indoor heat exchanger, one end of the second refrigerant flow path is communicated with a pipeline between the indoor heat exchanger and the plate heat exchanger through a liquid taking pipe, the other end of the second refrigerant flow path is communicated with an inlet of a gas-liquid separator through a return pipe, and a throttling device is arranged on the liquid taking pipe; the method for controlling the temperature of the refrigerant comprises the following steps:
when the multi-split air conditioning system is in a heating mode, acquiring the temperature of a refrigerant of the cooling pipeline;
detecting whether the temperature of the refrigerant is greater than or equal to a first preset temperature;
and if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, increasing the opening degree of the throttling device to reduce the refrigerant temperature.
Optionally, after the step of detecting whether the temperature of the refrigerant is greater than or equal to a first preset temperature, the method further includes:
if the refrigerant temperature is detected to be lower than the first preset temperature, detecting whether the refrigerant temperature is higher than or equal to a second preset temperature or not, wherein the first preset temperature is higher than the second preset temperature;
and if the temperature of the refrigerant is detected to be greater than or equal to the second preset temperature, controlling the opening of the throttling device to be unchanged.
Optionally, after the step of detecting whether the refrigerant temperature is greater than or equal to a second preset temperature if it is detected that the refrigerant temperature is less than the first preset temperature, the method further includes:
and if the refrigerant temperature is detected to be lower than the second preset temperature, closing the throttling device.
Optionally, before the step of detecting whether the refrigerant temperature is greater than or equal to a second preset temperature if it is detected that the refrigerant temperature is less than the first preset temperature, the method further includes:
acquiring the current relative humidity and the outdoor ambient temperature of the multi-split air-conditioning system;
and calculating to obtain a second preset temperature according to the environment temperature and the relative humidity.
Optionally, if it is detected that the refrigerant temperature is greater than or equal to the first preset temperature, the step of increasing the opening degree of the throttling device to reduce the refrigerant temperature includes:
if the temperature of the refrigerant is detected to be greater than or equal to the first preset temperature, acquiring a preset opening increasing step number;
and increasing the opening degree of the throttling device according to the opening degree increasing step number so as to reduce the temperature of the refrigerant.
Optionally, after the step of increasing the opening degree of the throttling device by the opening degree increase step number to decrease the temperature of the refrigerant, the method further includes:
re-acquiring the temperature of the refrigerant of the cooling pipeline after a preset time;
and if the temperature of the refrigerant obtained again is determined to be greater than or equal to the first preset temperature, increasing the opening degree of the throttling device again according to the opening degree increasing step number so as to reduce the temperature of the refrigerant.
Optionally, if it is detected that the refrigerant temperature is greater than or equal to the first preset temperature, the step of increasing the opening degree of the throttling device to reduce the refrigerant temperature includes:
if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, calculating a temperature difference value between the refrigerant temperature and the first preset temperature;
and determining the opening increasing step number according to the temperature difference, and increasing the opening of the throttling device according to the opening increasing step number to reduce the temperature of the refrigerant.
Optionally, the step of determining the opening degree increase step number according to the temperature difference value comprises:
and acquiring a mapping relation between a pre-stored corresponding difference value between the temperature of the refrigerant and a first preset temperature and the opening increasing step number, and determining the opening increasing step number according to the mapping relation and the calculated temperature difference value, wherein the opening increasing step number is increased along with the increase of the temperature difference value.
In addition, in order to achieve the above purpose, the present invention further provides a multi-split air conditioning system, which includes a plate heat exchanger and a cooling pipeline, wherein the cooling pipeline is used for cooling an electric control device of an outdoor unit of an air conditioner, a refrigerant flow path is arranged in the plate heat exchanger, a first refrigerant flow path and a second refrigerant flow path are arranged in the plate heat exchanger, two ends of the first refrigerant flow path are respectively connected with the cooling pipeline and an indoor heat exchanger, one end of the second refrigerant flow path is communicated with a pipeline between the indoor heat exchanger and the plate heat exchanger through a liquid taking pipe, the other end of the second refrigerant flow path is communicated with an inlet of a gas-liquid separator through a return pipe, and a throttling device is arranged on the liquid taking pipe; the multi-split air conditioning system comprises a memory, a processor and a control program of the temperature of the refrigerant, wherein the control program of the temperature of the refrigerant is stored in the memory and can run on the processor, and when the control program of the temperature of the refrigerant is executed by the processor, the control method of the temperature of the refrigerant corresponding to the Federal learning server is realized.
In addition, to achieve the above object, the present invention further provides a computer readable storage medium, in which a control program of a refrigerant temperature is stored, and the control program of the refrigerant temperature implements the steps of the method for controlling the refrigerant temperature when being executed by a processor.
The multi-split air conditioning system comprises a plate heat exchanger and a cooling pipeline, wherein the cooling pipeline is used for cooling an electric control device of an outdoor unit of an air conditioner; the liquid taking pipe is provided with a throttling device, the temperature of a refrigerant of the cooling pipeline is obtained when the multi-split air-conditioning system is in a heating mode, whether the temperature of the refrigerant is larger than or equal to a first preset temperature or not is detected, and if the temperature of the refrigerant is larger than or equal to the first preset temperature, the opening degree of the throttling device is increased so as to reduce the temperature of the refrigerant. When the temperature of the refrigerant of the cooling pipeline is too high, the temperature of the refrigerant is reduced by increasing the opening of the throttling device, the heat dissipation effect of the outdoor unit electric control device is improved, the outdoor unit electric control device is prevented from stopping working due to the fact that the heat dissipation effect is poor and entering a high-temperature protection state, the outdoor unit electric control device is prevented from being in a fault state due to the fact that the heat dissipation effect is poor, and therefore successful operation of the outdoor unit electric control device in the multi-split air-conditioning system is guaranteed.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for controlling a temperature of a refrigerant according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a multi-split air conditioning system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a hardware operating environment according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a method for controlling the temperature of a refrigerant, and referring to fig. 1, fig. 1 is a schematic flow chart of a first embodiment of the method for controlling the temperature of the refrigerant.
The present invention provides an embodiment of a method for controlling a temperature of a refrigerant, and it should be noted that, although a logic sequence is shown in the flowchart, in some cases, the steps shown or described may be executed in a different sequence from the sequence here.
The method for controlling the temperature of the refrigerant is applied to a multi-split air-conditioning system, the multi-split air-conditioning system comprises a plate heat exchanger and a cooling pipeline, the plate heat exchanger and the cooling pipeline are sequentially connected between an indoor heat exchanger and an outdoor heat exchanger, the cooling pipeline is used for cooling an electric control device of an outdoor unit of an air conditioner, a first refrigerant flow path and a second refrigerant flow path are arranged in the plate heat exchanger, two ends of the first refrigerant flow path are respectively connected with the cooling pipeline and the indoor heat exchanger, one end of the second refrigerant flow path is communicated with a pipeline between the indoor heat exchanger and the plate heat exchanger through a liquid taking pipe, and the other end of the second refrigerant flow path is communicated with an inlet of a gas-liquid separator through a return pipe; a throttling device is arranged on the liquid taking pipe.
Specifically, referring to fig. 2, fig. 2 is a schematic structural diagram of a multi-split air conditioning system according to an embodiment of the present invention. As shown in fig. 2, the multi-split air conditioning system at least includes a compressor 1, a four-way valve 2, a first heat exchanger 3, a throttling device 4, an outdoor unit electric control device 5, a first temperature detection module 6, a throttling device 7, a second heat exchanger 8, a second temperature detection module 9, a gas-liquid separator 10, and at least two indoor units. The second heat exchanger is a plate heat exchanger, the compressor is a power of the multi-split air conditioning system, in the multi-split air conditioning system, the purpose of the compressor is to compress low-temperature gas into high-temperature gas through the compressor, and finally the gas exchanges heat with other media in the heat exchanger. The four-way valve is used for switching the circulation path of the refrigerant so as to achieve the purposes of refrigeration and heating. The first temperature detection module and the second temperature detection module are components for detecting temperature, for example, the first temperature detection module and the second temperature detection module may be temperature sensors or other devices capable of detecting temperature. The throttling device plays a role in throttling and depressurizing the high-pressure refrigerant and adjusting the flow rate of the refrigerant entering the evaporator, and in the embodiment, the throttling device can be an electronic expansion valve or other types of throttling devices. Gas-liquid separator 10 if the refrigerant is not completely evaporated in the evaporator, the gas-liquid mixed refrigerant may first flow back into the gas-liquid separator, from which the gas is separated and flows back into the compressor. And the liquid can be left in the gas-liquid separator, thereby playing a role of buffering and protecting the compressor.
As can be seen from fig. 2, when the multi-split air conditioning system is in the heating mode, the compressor 1 discharges high-temperature and high-pressure gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant flows into each indoor unit through the four-way valve 2 to be heated, after the high-temperature gaseous refrigerant is condensed to release heat, the refrigerant is gathered to the main liquid pipe and flows into the outdoor unit, then the refrigerant passes through the second heat exchanger 8 and the outdoor unit electric control device 5 and is throttled by the throttling device 4, the refrigerant is evaporated and absorbs heat in the first heat exchanger 3 of the outdoor unit, the refrigerant passes through the four-way valve 2 and enters the gas-liquid separator 10, and the refrigerant is separated and then returns to the compressor 1 to be compressed, so that the whole cycle is completed.
And step S10, when the multi-split air conditioning system is in a heating mode, acquiring the temperature of the refrigerant of the cooling pipeline.
When the multi-split air-conditioning system is in a heating mode, the multi-split air-conditioning system acquires the temperature of the refrigerant of the cooling pipeline through the temperature detection module. It should be noted that the temperature detection module for acquiring the temperature of the refrigerant of the cooling pipe is the first temperature detection module in fig. 2, and as can be seen from fig. 2, the temperature detection module for acquiring the temperature of the refrigerant of the cooling pipe is arranged between the outdoor unit electric control device and the plate heat exchanger, that is, the temperature detection module for acquiring the temperature of the refrigerant of the cooling pipe is connected with the outdoor unit electric control device and the plate heat exchanger. The multi-split air conditioning system can acquire the current mode identification, and determine whether the multi-split air conditioning system is in a heating mode or a cooling mode currently through the mode identification. In this embodiment, two mode identifiers exist, one is a heating identifier for representing that the multi-split air-conditioning system is in a heating mode, and the other is a cooling identifier for representing that the multi-split air-conditioning system is in a cooling mode. It can be understood that when the multi-split air conditioning system determines that the current mode identifier is the heating identifier, the multi-split air conditioning system determines that the multi-split air conditioning system is currently in the heating mode; and when the multi-split air conditioning system determines that the current mode identifier is the refrigeration identifier, the multi-split air conditioning system determines that the multi-split air conditioning system is currently in the refrigeration mode.
It should be noted that, in the embodiment of the present invention, the refrigerant temperature of the cooling pipe does not have the air-supplementing and enthalpy-increasing function, that is, the main control target of the air-supplementing and enthalpy-increasing plate flow switching path in the embodiment of the present invention is to control the refrigerant temperature of the refrigerant passing through the outdoor unit electric control device, and the air-supplementing and enthalpy-increasing function cannot control the refrigerant temperature of the refrigerant entering the outdoor unit electric control device at the same time when being turned on. The vapor supplement and enthalpy increase is realized by adopting a two-stage throttling middle air injection technology for the compressor and adopting a flash evaporator to carry out gas-liquid separation, and the enthalpy increase effect is realized. As can be seen from fig. 2, compared with the existing design of the air-supply enthalpy-increasing plate converter circuit, in the design of the air-supply enthalpy-increasing plate converter circuit in this embodiment, it is not necessary to add a branch to control the refrigerant in the plate heat exchanger to flow into the compressor, and for the refrigerant that needs to flow through the outdoor unit electric control device, when passing through the plate heat exchanger, a throttling device is used to split a part of the refrigerant, at this time, the throttling device and the plate heat exchanger are in parallel connection mode, and the refrigerant flowing through the throttling device and the plate heat exchanger can converge and flow through the outdoor unit electric control device.
Step S20, detecting whether the refrigerant temperature is greater than or equal to a first preset temperature.
In step S30, if it is detected that the refrigerant temperature is greater than or equal to the first preset temperature, the opening degree of the throttling device is increased to decrease the refrigerant temperature.
After the multi-split air-conditioning system obtains the refrigerant temperature corresponding to the power mode, the multi-split air-conditioning system detects whether the refrigerant temperature is greater than or equal to a first preset temperature, wherein the first preset temperature can be set by a user according to specific needs, and the first preset temperature can also be obtained through test tests by the user. If the multi-split air conditioning system detects that the temperature of the refrigerant is greater than or equal to the first preset temperature, the multi-split air conditioning system increases the opening degree of the throttling device to reduce the temperature of the refrigerant, at this time, the opening degree of the throttling device 7 connected with the second heat exchanger 8 in fig. 2 is increased, and in the embodiment, the controlled throttling device is the throttling device 7 in fig. 2. It can be understood that, when the opening degree of the throttling device is increased, the refrigerant passing through the outdoor unit electric control device is increased, so that the temperature of the refrigerant of the cooling pipeline is reduced. In fig. 2, a refrigerant bypass (dotted line) formed by the plate heat exchanger and the throttling device is opposite to the refrigerant flow direction in the refrigerant main passage (solid line), and the refrigerant enters the plate heat exchanger through the throttling device to exchange heat.
Further, step S30 includes:
step a, if the temperature of the refrigerant is detected to be greater than or equal to the first preset temperature, acquiring a preset opening increasing step number.
And b, increasing the opening of the throttling device according to the opening increasing steps so as to reduce the temperature of the refrigerant.
Further, if the multi-split air conditioning system detects that the temperature of the refrigerant is greater than or equal to a first preset temperature, the multi-split air conditioning system obtains a preset opening increasing step number, wherein the opening increasing step number can be preset by a user according to needs, and for example, the opening increasing step number can be set to be 2, 3 or 5. And when the opening increasing step number is determined, the multi-split air-conditioning system increases the opening of the throttling device according to the opening increasing step number so as to reduce the temperature of the refrigerant. If the original opening degree of the throttle device is a and the number of opening degree increase steps is B, the opening degree of the throttle device after increasing the opening degree is a + B.
Further, the multi-split air conditioning system can also obtain the total opening degree of the throttling device, determine the current opening degree of the throttling device, subtract the current opening degree from the total opening degree to obtain an opening degree difference value between the total opening degree and the current opening degree, and then obtain the opening degree increasing step number according to the opening degree difference value, and if the opening degree difference value is multiplied by a preset proportion, obtain the opening degree increasing step number. Wherein the preset ratio may be set to 5%, 10% or 20%. Further, if the value obtained by multiplying the opening difference value by the preset proportion is less than 1, the multi-split air-conditioning system determines that the opening increasing step number is 1; and if the product of the opening difference value and the preset proportion has a decimal point, determining the opening increasing step number according to the product by adopting a rounding method, and if the product of the opening difference value and the preset proportion is 5.3, determining the opening increasing step number to be 5.
Further, the method for controlling the temperature of the refrigerant further comprises the following steps:
and c, acquiring the temperature of the refrigerant of the cooling pipeline again after a preset time.
And d, if the temperature of the refrigerant obtained again is determined to be greater than or equal to the first preset temperature, increasing the opening of the throttling device again according to the opening increasing steps so as to reduce the temperature of the refrigerant.
Further, after the multi-split air-conditioning system increases the opening degree of the throttling device, the multi-split air-conditioning system obtains the temperature of the refrigerant of the cooling pipeline through the temperature detection module again after a preset time period, and judges whether the temperature of the refrigerant obtained again is larger than or equal to a first preset temperature. The preset duration may be set according to specific needs, and the size of the preset duration is not specifically limited in this embodiment. And if the multi-split air-conditioning system determines that the temperature of the refrigerant obtained again is greater than or equal to the first preset temperature, the multi-split air-conditioning system increases the opening of the throttling device again according to the opening increasing step number so as to successfully reduce the temperature of the refrigerant. It is understood that, if the opening degree of the throttle device is a + B after the opening degree of the throttle device is increased for the first time, the opening degree of the throttle device is a + B after the opening degree of the throttle device is increased again by the opening degree increase steps. Further, if it is determined that the temperature of the refrigerant obtained again is lower than the first preset temperature, it is determined that the temperature of the refrigerant in the cooling line pipe has decreased, and at this time, the opening degree of the throttling device is not increased in the multi-split air conditioning system.
Further, step S30 further includes:
and e, if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, calculating a temperature difference value between the refrigerant temperature and the first preset temperature.
And f, determining the opening increasing step number according to the temperature difference, and increasing the opening of the throttling device according to the opening increasing step number so as to reduce the temperature of the refrigerant.
Further, if the multi-split air-conditioning system detects that the temperature of the refrigerant is greater than or equal to a first preset temperature, the multi-split air-conditioning system subtracts the first preset temperature from the temperature of the refrigerant to calculate a temperature difference value between the temperature of the refrigerant and the first preset temperature. After the multi-split air-conditioning system calculates the temperature difference between the refrigerant temperature and the first preset temperature, the multi-split air-conditioning system determines the opening increasing step number according to the temperature difference, and increases the opening of the throttling device according to the determined opening increasing step number to reduce the refrigerant temperature. It is understood that as the temperature difference increases, the corresponding opening increase steps also increase.
Further, the method for controlling the temperature of the refrigerant further comprises the following steps:
and g, acquiring a mapping relation between a corresponding difference value between a pre-stored refrigerant temperature and a first preset temperature and an opening increasing step number, and determining the opening increasing step number according to the mapping relation and the calculated temperature difference value, wherein the opening increasing step number is increased along with the increase of the temperature difference value.
Further, in the process of determining the opening increasing steps according to the temperature difference between the refrigerant temperature and the first preset temperature, the multi-split air conditioning system obtains the mapping relation between the corresponding difference between the pre-stored refrigerant temperature and the first preset temperature and the opening increasing steps, and determines the opening increasing steps according to the temperature difference obtained through the mapping relation and calculation. The mapping relationship may be set according to specific needs, and in the mapping relationship, one difference value may correspond to one opening increasing step number, or a plurality of difference values may correspond to one opening increasing step number.
Further, in the embodiment, the refrigerant is hermetically packaged in the multi-split air conditioning system, and the refrigerant is isolated from the outside by hermetically packaging the refrigerant, so that the condensation phenomenon of the refrigerant due to the contact with the outside air is avoided.
In this embodiment, when the multi-split air conditioning system is in the heating mode, the refrigerant temperature of the cooling pipe is obtained, whether the refrigerant temperature is greater than or equal to a first preset temperature or not is detected, and if the refrigerant temperature is greater than or equal to the first preset temperature, the opening degree of the throttling device is increased to reduce the refrigerant temperature. When the temperature of the refrigerant of the cooling pipeline is too high, the temperature of the refrigerant is reduced by increasing the opening of the throttling device, the heat dissipation effect of the outdoor unit electric control device is improved, the outdoor unit electric control device is prevented from stopping working due to the fact that the heat dissipation effect is poor and entering a high-temperature protection state, the outdoor unit electric control device is prevented from being in a fault state due to the fact that the heat dissipation effect is poor, and therefore successful operation of the outdoor unit electric control device in the multi-split air-conditioning system is guaranteed.
Further, a second embodiment of the method for controlling the temperature of the refrigerant according to the present invention is provided. The difference between the second embodiment of the method for controlling the temperature of the refrigerant and the first embodiment of the method for controlling the temperature of the refrigerant is that the method for controlling the temperature of the refrigerant further comprises the following steps:
and h, if the refrigerant temperature is detected to be lower than the first preset temperature, detecting whether the refrigerant temperature is higher than or equal to a second preset temperature, wherein the first preset temperature is higher than the second preset temperature.
And i, if the temperature of the refrigerant is detected to be greater than or equal to the second preset temperature, controlling the opening degree of the throttling device to be unchanged.
If the multi-split air conditioning system detects that the temperature of the refrigerant is less than the first preset temperature, the multi-split air conditioning system detects whether the temperature of the refrigerant is greater than or equal to the second preset temperature, wherein the first preset temperature is greater than the second preset temperature, the second preset temperature can be set according to specific needs, and the embodiment does not limit the second preset temperature. If the multi-split air conditioning system detects that the temperature of the refrigerant is greater than or equal to the second preset temperature, the multi-split air conditioning system controls the opening of the throttling device to be unchanged, so that the temperature of the refrigerant is controlled to be kept within a reasonable range by controlling the opening of the throttling device to be unchanged, the refrigerant temperature is prevented from being too high, an outdoor unit electric control device is prevented from entering a high-temperature protection state and stopping working, the outdoor unit electric control device is prevented from being in a fault state, and the refrigerant temperature is prevented from being too low and causing a water condensation phenomenon.
Further, the method for controlling the temperature of the refrigerant further comprises the following steps:
and j, acquiring the current relative humidity and the outdoor ambient temperature of the multi-split air conditioning system.
And k, calculating to obtain a second preset temperature according to the environment temperature and the relative humidity.
Further, the multi-split air conditioning system obtains the current relative humidity, wherein the relative humidity refers to the percentage of the water vapor pressure in the air to the saturated water vapor pressure at the same temperature, or the ratio of the absolute humidity of the humid air to the maximum absolute humidity which can be reached at the same temperature, and can also be expressed as the ratio of the water vapor partial pressure in the humid air to the saturated pressure of the water at the same temperature. In particular, in a multi-split air conditioning system, a humidity sensor is provided,the relative humidity may be obtained by a humidity sensor. The multi-split air conditioning system acquires an outdoor ambient temperature, and particularly, the multi-split air conditioning system can acquire the outdoor ambient temperature through a temperature sensor. And after the multi-split air-conditioning system obtains the ambient temperature and the relative humidity, the multi-split air-conditioning system calculates to obtain a second preset temperature according to the ambient temperature and the relative humidity. Specifically, if the second preset temperature is denoted as TdpThen, the formula of the second preset temperature calculated by the multi-split air conditioning system according to the ambient temperature and the relative humidity may be represented as:
where H1 denotes relative humidity, T1+273.15, T1 denotes ambient temperature, T1 is given in degrees celsius, c8＝-5800.2206，c9＝1.3914993，c10＝-0.04860239，c11＝0.41764768×10-4，c12＝-0.14452093×10-7，c136.5459673. It is understood that, at this time, the second preset temperature is the dew point temperature.
In the embodiment, whether the temperature of the refrigerant is greater than or equal to a second preset temperature or not is further detected when the temperature of the refrigerant is detected to be less than the first preset temperature, if the temperature of the refrigerant is detected to be greater than or equal to the second preset temperature, the opening degree of the throttling device is controlled to be unchanged, the temperature of the refrigerant is controlled to be kept within a reasonable range by controlling the opening degree of the throttling device to be unchanged, the refrigerant temperature is prevented from being too high, an outdoor unit electric control device enters a high-temperature protection state to stop working, the outdoor unit electric control device is prevented from being in a fault state, the refrigerant temperature is also prevented from being too low, a water condensation phenomenon is prevented, and the safety of the outdoor unit electric control device of the multi-split air conditioning system in the use process is ensured.
Further, a third embodiment of the method for controlling the temperature of the refrigerant according to the present invention is provided. The difference between the third embodiment of the method for controlling the temperature of the refrigerant and the second embodiment of the method for controlling the temperature of the refrigerant is that the method for controlling the temperature of the refrigerant further comprises:
and step l, if the temperature of the refrigerant is detected to be lower than the second preset temperature, closing the throttling device.
If the multi-split air-conditioning system detects that the temperature of the refrigerant is lower than the second preset temperature, the multi-split air-conditioning system closes the throttling device, so that the phenomenon of water condensation caused by the fact that the temperature of the refrigerant passing through the outdoor unit electric control device is too low is avoided, and the phenomenon of water condensation caused by the fact that the outdoor unit electric control device is burnt out is avoided. Further, after the throttling device is closed, the multi-split air-conditioning system can automatically generate prompt information, and the prompt information is sent to a mobile terminal connected with the multi-split air-conditioning system or output by the multi-split air-conditioning system. When the mobile terminal receives the prompt message, the mobile terminal outputs the prompt message to prompt a user that a throttling device in the multi-split air-conditioning system is closed through the prompt message, so that the user of the mobile terminal can know the reason why the multi-split air-conditioning system stops working in time. In this embodiment, the output mode of the multi-split air conditioning system and the mobile terminal for outputting the prompt information is not limited.
According to the embodiment of the invention, when the temperature of the refrigerant is detected to be lower than the second preset temperature, the throttling device is closed, so that the phenomenon of water condensation caused by too low temperature of the refrigerant passing through the outdoor unit electric control device is avoided, the outdoor unit electric control device is prevented from being burnt out, the service life of the outdoor unit electric control device in the multi-split air-conditioning system is prolonged, and the use safety of the outdoor unit electric control device is improved.
In addition, the invention also provides a multi-split air conditioning system. As shown in fig. 3, fig. 3 is a schematic structural diagram of a hardware operating environment according to an embodiment of the present invention.
It should be noted that fig. 3 may be a schematic structural diagram of a hardware operating environment of the multi-split air conditioning system. The multi-split air conditioning system in the embodiment of the invention can be terminal equipment such as a PC, a portable computer and the like.
As shown in fig. 3, the multi-split air conditioning system may include: a processor 1001, such as an MCU or a microprocessor, a memory 1005, a user interface 1003, a network interface 1004, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration of the multi-split air conditioning system illustrated in fig. 3 is not intended to be limiting, and may include more or fewer components than those illustrated, or some components may be combined, or a different arrangement of components.
As shown in fig. 3, the memory 1005, which is a kind of computer storage medium, may include an operating system, a network communication module, a user interface module, and a control program for controlling the temperature of the refrigerant. The operating system is a program for managing and controlling hardware and software resources of the multi-split air conditioning system, and supports a control program of the refrigerant temperature and the operation of other software or programs.
In the multi-split air conditioning system shown in fig. 3, the user interface 1003 is mainly used for connecting to the mobile terminal, and performing data communication with the mobile terminal, such as sending a prompt message to the mobile terminal; the network interface 1004 is mainly used for the background server and performs data communication with the background server; the processor 1001 may be configured to call a control program of the refrigerant temperature stored in the memory 1005, and execute the steps of the method for controlling the refrigerant temperature.
The specific implementation of the multi-split air conditioning system of the invention is basically the same as the embodiments of the refrigerant temperature control method, and is not described herein again.
In addition, an embodiment of the present invention further provides a computer-readable storage medium, where a control program of a refrigerant temperature is stored on the computer-readable storage medium, and when executed by a processor, the control program of the refrigerant temperature implements the following steps:
when the multi-split air conditioning system is in a heating mode, acquiring the temperature of a refrigerant of the cooling pipeline;
detecting whether the temperature of the refrigerant is greater than or equal to a first preset temperature;
and if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, increasing the opening degree of the throttling device to reduce the refrigerant temperature.
Further, after the step of detecting whether the refrigerant temperature is greater than or equal to a first preset temperature, when the control program of the refrigerant temperature is executed by the processor, the following steps are also executed:
if the refrigerant temperature is detected to be lower than the first preset temperature, detecting whether the refrigerant temperature is higher than or equal to a second preset temperature or not, wherein the first preset temperature is higher than the second preset temperature;
and if the temperature of the refrigerant is detected to be greater than or equal to the second preset temperature, controlling the opening of the throttling device to be unchanged.
Further, after the step of detecting whether the refrigerant temperature is greater than or equal to a second preset temperature if the refrigerant temperature is detected to be less than the first preset temperature, the control program of the refrigerant temperature is executed by a processor to further execute the following steps:
and if the refrigerant temperature is detected to be lower than the second preset temperature, closing the throttling device.
Further, before the step of detecting whether the refrigerant temperature is greater than or equal to a second preset temperature if the refrigerant temperature is detected to be less than the first preset temperature, the following steps are also executed when the control program of the refrigerant temperature is executed by the processor:
acquiring the current relative humidity and the outdoor ambient temperature of the multi-split air-conditioning system;
and calculating to obtain a second preset temperature according to the environment temperature and the relative humidity.
Further, if it is detected that the refrigerant temperature is greater than or equal to the first preset temperature, the step of increasing the opening degree of the throttling device to reduce the refrigerant temperature includes:
if the temperature of the refrigerant is detected to be greater than or equal to the first preset temperature, acquiring a preset opening increasing step number;
and increasing the opening degree of the throttling device according to the opening degree increasing step number so as to reduce the temperature of the refrigerant.
Further, after the step of increasing the opening degree of the throttle device by the opening degree increase step number to decrease the refrigerant temperature, the control program for the refrigerant temperature is executed by a processor, and the control program further executes:
re-acquiring the temperature of the refrigerant of the cooling pipeline after a preset time;
and if the temperature of the refrigerant obtained again is determined to be greater than or equal to the first preset temperature, increasing the opening degree of the throttling device again according to the opening degree increasing step number so as to reduce the temperature of the refrigerant.
Further, if it is detected that the refrigerant temperature is greater than or equal to the first preset temperature, the step of increasing the opening degree of the throttling device to reduce the refrigerant temperature includes:
if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, calculating a temperature difference value between the refrigerant temperature and the first preset temperature;
and determining the opening increasing step number according to the temperature difference, and increasing the opening of the throttling device according to the opening increasing step number to reduce the temperature of the refrigerant.
Further, the step of determining the number of opening degree increase steps according to the temperature difference value includes:
and acquiring a mapping relation between a corresponding difference value between the pre-stored refrigerant temperature and the first preset temperature and the opening increasing step number, and determining the opening increasing step number according to the mapping relation and the calculated temperature difference value.
The specific implementation of the computer-readable storage medium of the present invention is substantially the same as the embodiments of the method for controlling the temperature of the refrigerant, and will not be described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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 process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The method for controlling the temperature of the refrigerant is characterized by being applied to a multi-split air-conditioning system, wherein the multi-split air-conditioning system comprises a plate heat exchanger and a cooling pipeline, the cooling pipeline is used for cooling an electric control device of an outdoor unit of an air conditioner, a refrigerant flow path is arranged in the plate heat exchanger, a first refrigerant flow path and a second refrigerant flow path are arranged in the plate heat exchanger, two ends of the first refrigerant flow path are respectively connected with the cooling pipeline and an indoor heat exchanger, one end of the second refrigerant flow path is communicated with a pipeline between the indoor heat exchanger and the plate heat exchanger through a liquid taking pipe, the other end of the second refrigerant flow path is communicated with an inlet of a gas-liquid separator through a return pipe, and a throttling device is arranged on the liquid taking pipe; the control method of the refrigerant temperature comprises the following steps:
when the multi-split air conditioning system is in a heating mode, acquiring the temperature of a refrigerant of the cooling pipeline;
detecting whether the temperature of the refrigerant is greater than or equal to a first preset temperature;
and if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, increasing the opening degree of the throttling device to reduce the refrigerant temperature.
2. The method for controlling the temperature of the refrigerant according to claim 1, wherein after the step of detecting whether the temperature of the refrigerant is greater than or equal to a first preset temperature, the method further comprises:
if the refrigerant temperature is detected to be lower than the first preset temperature, detecting whether the refrigerant temperature is higher than or equal to a second preset temperature or not, wherein the first preset temperature is higher than the second preset temperature;
and if the temperature of the refrigerant is detected to be greater than or equal to the second preset temperature, controlling the opening of the throttling device to be unchanged.
3. The method for controlling refrigerant temperature according to claim 2, wherein after the step of detecting whether the refrigerant temperature is greater than or equal to a second predetermined temperature if the refrigerant temperature is detected to be less than the first predetermined temperature, the method further comprises:
and if the refrigerant temperature is detected to be lower than the second preset temperature, closing the throttling device.
4. The method for controlling refrigerant temperature according to claim 2, wherein before the step of detecting whether the refrigerant temperature is greater than or equal to a second predetermined temperature if the refrigerant temperature is detected to be less than the first predetermined temperature, the method further comprises:
acquiring the current relative humidity and the outdoor ambient temperature of the multi-split air-conditioning system;
and calculating to obtain a second preset temperature according to the environment temperature and the relative humidity.
5. The method of controlling a temperature of a refrigerant according to any one of claims 1 to 4, wherein the step of increasing the opening degree of the throttling device to decrease the temperature of the refrigerant if it is detected that the temperature of the refrigerant is greater than or equal to the first preset temperature includes:
if the temperature of the refrigerant is detected to be greater than or equal to the first preset temperature, acquiring a preset opening increasing step number;
and increasing the opening degree of the throttling device according to the opening degree increasing step number so as to reduce the temperature of the refrigerant.
6. The method of controlling a refrigerant temperature according to claim 5, further comprising, after the step of increasing the opening degree of the expansion device in accordance with the opening degree increase step number to decrease the refrigerant temperature:
re-acquiring the temperature of the refrigerant of the cooling pipeline after a preset time;
and if the temperature of the refrigerant obtained again is determined to be greater than or equal to the first preset temperature, increasing the opening degree of the throttling device again according to the opening degree increasing step number so as to reduce the temperature of the refrigerant.
7. The method of controlling a temperature of a refrigerant according to any one of claims 1 to 4, wherein the step of increasing the opening degree of the throttling device to decrease the temperature of the refrigerant if it is detected that the temperature of the refrigerant is greater than or equal to the first preset temperature includes:
if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, calculating a temperature difference value between the refrigerant temperature and the first preset temperature;
and determining the opening increasing step number according to the temperature difference, and increasing the opening of the throttling device according to the opening increasing step number to reduce the temperature of the refrigerant.
8. The method for controlling refrigerant temperature according to claim 7, wherein the step of determining the number of opening degree increasing steps according to the temperature difference comprises:
and acquiring a mapping relation between a pre-stored corresponding difference value between the temperature of the refrigerant and a first preset temperature and the opening increasing step number, and determining the opening increasing step number according to the mapping relation and the calculated temperature difference value, wherein the opening increasing step number is increased along with the increase of the temperature difference value.
9. The multi-split air conditioning system is characterized by comprising a plate heat exchanger and a cooling pipeline, wherein the cooling pipeline is used for cooling an electric control device of an outdoor unit of an air conditioner, a refrigerant flow path is arranged in the plate heat exchanger, a first refrigerant flow path and a second refrigerant flow path are arranged in the plate heat exchanger, two ends of the first refrigerant flow path are respectively connected with the cooling pipeline and an indoor heat exchanger, one end of the second refrigerant flow path is communicated with a pipeline between the indoor heat exchanger and the plate heat exchanger through a liquid taking pipe, the other end of the second refrigerant flow path is communicated with an inlet of a gas-liquid separator through a return pipe, and a throttling device is arranged on the liquid taking pipe; the multi-split air conditioning system further comprises a memory, a processor and a control program of the refrigerant temperature, which is stored in the memory and can be run on the processor, wherein the control program of the refrigerant temperature is executed by the processor to realize the steps of the control method of the refrigerant temperature as set forth in any one of claims 1 to 8.
10. A computer-readable storage medium, wherein a control program of a refrigerant temperature is stored on the computer-readable storage medium, and when the control program of the refrigerant temperature is executed by a processor, the steps of the method for controlling the refrigerant temperature according to any one of claims 1 to 8 are implemented.
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